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1 | 2da776db | Michael R. Hines | /*
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2 | 2da776db | Michael R. Hines | * RDMA protocol and interfaces
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3 | 2da776db | Michael R. Hines | *
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4 | 2da776db | Michael R. Hines | * Copyright IBM, Corp. 2010-2013
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5 | 2da776db | Michael R. Hines | *
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6 | 2da776db | Michael R. Hines | * Authors:
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7 | 2da776db | Michael R. Hines | * Michael R. Hines <mrhines@us.ibm.com>
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8 | 2da776db | Michael R. Hines | * Jiuxing Liu <jl@us.ibm.com>
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9 | 2da776db | Michael R. Hines | *
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10 | 2da776db | Michael R. Hines | * This work is licensed under the terms of the GNU GPL, version 2 or
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11 | 2da776db | Michael R. Hines | * later. See the COPYING file in the top-level directory.
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12 | 2da776db | Michael R. Hines | *
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13 | 2da776db | Michael R. Hines | */
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14 | 2da776db | Michael R. Hines | #include "qemu-common.h" |
15 | 2da776db | Michael R. Hines | #include "migration/migration.h" |
16 | 2da776db | Michael R. Hines | #include "migration/qemu-file.h" |
17 | 2da776db | Michael R. Hines | #include "exec/cpu-common.h" |
18 | 2da776db | Michael R. Hines | #include "qemu/main-loop.h" |
19 | 2da776db | Michael R. Hines | #include "qemu/sockets.h" |
20 | 2da776db | Michael R. Hines | #include "qemu/bitmap.h" |
21 | 2da776db | Michael R. Hines | #include "block/coroutine.h" |
22 | 2da776db | Michael R. Hines | #include <stdio.h> |
23 | 2da776db | Michael R. Hines | #include <sys/types.h> |
24 | 2da776db | Michael R. Hines | #include <sys/socket.h> |
25 | 2da776db | Michael R. Hines | #include <netdb.h> |
26 | 2da776db | Michael R. Hines | #include <arpa/inet.h> |
27 | 2da776db | Michael R. Hines | #include <string.h> |
28 | 2da776db | Michael R. Hines | #include <rdma/rdma_cma.h> |
29 | 2da776db | Michael R. Hines | |
30 | 2da776db | Michael R. Hines | #define DEBUG_RDMA
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31 | 2da776db | Michael R. Hines | //#define DEBUG_RDMA_VERBOSE
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32 | 2da776db | Michael R. Hines | //#define DEBUG_RDMA_REALLY_VERBOSE
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33 | 2da776db | Michael R. Hines | |
34 | 2da776db | Michael R. Hines | #ifdef DEBUG_RDMA
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35 | 2da776db | Michael R. Hines | #define DPRINTF(fmt, ...) \
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36 | 2da776db | Michael R. Hines | do { printf("rdma: " fmt, ## __VA_ARGS__); } while (0) |
37 | 2da776db | Michael R. Hines | #else
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38 | 2da776db | Michael R. Hines | #define DPRINTF(fmt, ...) \
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39 | 2da776db | Michael R. Hines | do { } while (0) |
40 | 2da776db | Michael R. Hines | #endif
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41 | 2da776db | Michael R. Hines | |
42 | 2da776db | Michael R. Hines | #ifdef DEBUG_RDMA_VERBOSE
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43 | 2da776db | Michael R. Hines | #define DDPRINTF(fmt, ...) \
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44 | 2da776db | Michael R. Hines | do { printf("rdma: " fmt, ## __VA_ARGS__); } while (0) |
45 | 2da776db | Michael R. Hines | #else
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46 | 2da776db | Michael R. Hines | #define DDPRINTF(fmt, ...) \
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47 | 2da776db | Michael R. Hines | do { } while (0) |
48 | 2da776db | Michael R. Hines | #endif
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49 | 2da776db | Michael R. Hines | |
50 | 2da776db | Michael R. Hines | #ifdef DEBUG_RDMA_REALLY_VERBOSE
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51 | 2da776db | Michael R. Hines | #define DDDPRINTF(fmt, ...) \
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52 | 2da776db | Michael R. Hines | do { printf("rdma: " fmt, ## __VA_ARGS__); } while (0) |
53 | 2da776db | Michael R. Hines | #else
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54 | 2da776db | Michael R. Hines | #define DDDPRINTF(fmt, ...) \
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55 | 2da776db | Michael R. Hines | do { } while (0) |
56 | 2da776db | Michael R. Hines | #endif
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57 | 2da776db | Michael R. Hines | |
58 | 2da776db | Michael R. Hines | /*
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59 | 2da776db | Michael R. Hines | * Print and error on both the Monitor and the Log file.
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60 | 2da776db | Michael R. Hines | */
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61 | 2da776db | Michael R. Hines | #define ERROR(errp, fmt, ...) \
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62 | 2da776db | Michael R. Hines | do { \
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63 | 2da776db | Michael R. Hines | fprintf(stderr, "RDMA ERROR: " fmt, ## __VA_ARGS__); \ |
64 | 2da776db | Michael R. Hines | if (errp && (*(errp) == NULL)) { \ |
65 | 2da776db | Michael R. Hines | error_setg(errp, "RDMA ERROR: " fmt, ## __VA_ARGS__); \ |
66 | 2da776db | Michael R. Hines | } \ |
67 | 2da776db | Michael R. Hines | } while (0) |
68 | 2da776db | Michael R. Hines | |
69 | 2da776db | Michael R. Hines | #define RDMA_RESOLVE_TIMEOUT_MS 10000 |
70 | 2da776db | Michael R. Hines | |
71 | 2da776db | Michael R. Hines | /* Do not merge data if larger than this. */
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72 | 2da776db | Michael R. Hines | #define RDMA_MERGE_MAX (2 * 1024 * 1024) |
73 | 2da776db | Michael R. Hines | #define RDMA_SIGNALED_SEND_MAX (RDMA_MERGE_MAX / 4096) |
74 | 2da776db | Michael R. Hines | |
75 | 2da776db | Michael R. Hines | #define RDMA_REG_CHUNK_SHIFT 20 /* 1 MB */ |
76 | 2da776db | Michael R. Hines | |
77 | 2da776db | Michael R. Hines | /*
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78 | 2da776db | Michael R. Hines | * This is only for non-live state being migrated.
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79 | 2da776db | Michael R. Hines | * Instead of RDMA_WRITE messages, we use RDMA_SEND
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80 | 2da776db | Michael R. Hines | * messages for that state, which requires a different
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81 | 2da776db | Michael R. Hines | * delivery design than main memory.
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82 | 2da776db | Michael R. Hines | */
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83 | 2da776db | Michael R. Hines | #define RDMA_SEND_INCREMENT 32768 |
84 | 2da776db | Michael R. Hines | |
85 | 2da776db | Michael R. Hines | /*
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86 | 2da776db | Michael R. Hines | * Maximum size infiniband SEND message
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87 | 2da776db | Michael R. Hines | */
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88 | 2da776db | Michael R. Hines | #define RDMA_CONTROL_MAX_BUFFER (512 * 1024) |
89 | 2da776db | Michael R. Hines | #define RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE 4096 |
90 | 2da776db | Michael R. Hines | |
91 | 2da776db | Michael R. Hines | #define RDMA_CONTROL_VERSION_CURRENT 1 |
92 | 2da776db | Michael R. Hines | /*
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93 | 2da776db | Michael R. Hines | * Capabilities for negotiation.
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94 | 2da776db | Michael R. Hines | */
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95 | 2da776db | Michael R. Hines | #define RDMA_CAPABILITY_PIN_ALL 0x01 |
96 | 2da776db | Michael R. Hines | |
97 | 2da776db | Michael R. Hines | /*
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98 | 2da776db | Michael R. Hines | * Add the other flags above to this list of known capabilities
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99 | 2da776db | Michael R. Hines | * as they are introduced.
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100 | 2da776db | Michael R. Hines | */
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101 | 2da776db | Michael R. Hines | static uint32_t known_capabilities = RDMA_CAPABILITY_PIN_ALL;
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102 | 2da776db | Michael R. Hines | |
103 | 2da776db | Michael R. Hines | #define CHECK_ERROR_STATE() \
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104 | 2da776db | Michael R. Hines | do { \
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105 | 2da776db | Michael R. Hines | if (rdma->error_state) { \
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106 | 2da776db | Michael R. Hines | if (!rdma->error_reported) { \
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107 | 2da776db | Michael R. Hines | fprintf(stderr, "RDMA is in an error state waiting migration" \
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108 | 2da776db | Michael R. Hines | " to abort!\n"); \
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109 | 2da776db | Michael R. Hines | rdma->error_reported = 1; \
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110 | 2da776db | Michael R. Hines | } \ |
111 | 2da776db | Michael R. Hines | return rdma->error_state; \
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112 | 2da776db | Michael R. Hines | } \ |
113 | 2da776db | Michael R. Hines | } while (0); |
114 | 2da776db | Michael R. Hines | |
115 | 2da776db | Michael R. Hines | /*
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116 | 2da776db | Michael R. Hines | * A work request ID is 64-bits and we split up these bits
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117 | 2da776db | Michael R. Hines | * into 3 parts:
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118 | 2da776db | Michael R. Hines | *
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119 | 2da776db | Michael R. Hines | * bits 0-15 : type of control message, 2^16
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120 | 2da776db | Michael R. Hines | * bits 16-29: ram block index, 2^14
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121 | 2da776db | Michael R. Hines | * bits 30-63: ram block chunk number, 2^34
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122 | 2da776db | Michael R. Hines | *
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123 | 2da776db | Michael R. Hines | * The last two bit ranges are only used for RDMA writes,
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124 | 2da776db | Michael R. Hines | * in order to track their completion and potentially
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125 | 2da776db | Michael R. Hines | * also track unregistration status of the message.
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126 | 2da776db | Michael R. Hines | */
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127 | 2da776db | Michael R. Hines | #define RDMA_WRID_TYPE_SHIFT 0UL |
128 | 2da776db | Michael R. Hines | #define RDMA_WRID_BLOCK_SHIFT 16UL |
129 | 2da776db | Michael R. Hines | #define RDMA_WRID_CHUNK_SHIFT 30UL |
130 | 2da776db | Michael R. Hines | |
131 | 2da776db | Michael R. Hines | #define RDMA_WRID_TYPE_MASK \
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132 | 2da776db | Michael R. Hines | ((1UL << RDMA_WRID_BLOCK_SHIFT) - 1UL) |
133 | 2da776db | Michael R. Hines | |
134 | 2da776db | Michael R. Hines | #define RDMA_WRID_BLOCK_MASK \
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135 | 2da776db | Michael R. Hines | (~RDMA_WRID_TYPE_MASK & ((1UL << RDMA_WRID_CHUNK_SHIFT) - 1UL)) |
136 | 2da776db | Michael R. Hines | |
137 | 2da776db | Michael R. Hines | #define RDMA_WRID_CHUNK_MASK (~RDMA_WRID_BLOCK_MASK & ~RDMA_WRID_TYPE_MASK)
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138 | 2da776db | Michael R. Hines | |
139 | 2da776db | Michael R. Hines | /*
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140 | 2da776db | Michael R. Hines | * RDMA migration protocol:
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141 | 2da776db | Michael R. Hines | * 1. RDMA Writes (data messages, i.e. RAM)
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142 | 2da776db | Michael R. Hines | * 2. IB Send/Recv (control channel messages)
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143 | 2da776db | Michael R. Hines | */
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144 | 2da776db | Michael R. Hines | enum {
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145 | 2da776db | Michael R. Hines | RDMA_WRID_NONE = 0,
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146 | 2da776db | Michael R. Hines | RDMA_WRID_RDMA_WRITE = 1,
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147 | 2da776db | Michael R. Hines | RDMA_WRID_SEND_CONTROL = 2000,
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148 | 2da776db | Michael R. Hines | RDMA_WRID_RECV_CONTROL = 4000,
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149 | 2da776db | Michael R. Hines | }; |
150 | 2da776db | Michael R. Hines | |
151 | 2da776db | Michael R. Hines | const char *wrid_desc[] = { |
152 | 2da776db | Michael R. Hines | [RDMA_WRID_NONE] = "NONE",
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153 | 2da776db | Michael R. Hines | [RDMA_WRID_RDMA_WRITE] = "WRITE RDMA",
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154 | 2da776db | Michael R. Hines | [RDMA_WRID_SEND_CONTROL] = "CONTROL SEND",
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155 | 2da776db | Michael R. Hines | [RDMA_WRID_RECV_CONTROL] = "CONTROL RECV",
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156 | 2da776db | Michael R. Hines | }; |
157 | 2da776db | Michael R. Hines | |
158 | 2da776db | Michael R. Hines | /*
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159 | 2da776db | Michael R. Hines | * Work request IDs for IB SEND messages only (not RDMA writes).
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160 | 2da776db | Michael R. Hines | * This is used by the migration protocol to transmit
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161 | 2da776db | Michael R. Hines | * control messages (such as device state and registration commands)
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162 | 2da776db | Michael R. Hines | *
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163 | 2da776db | Michael R. Hines | * We could use more WRs, but we have enough for now.
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164 | 2da776db | Michael R. Hines | */
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165 | 2da776db | Michael R. Hines | enum {
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166 | 2da776db | Michael R. Hines | RDMA_WRID_READY = 0,
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167 | 2da776db | Michael R. Hines | RDMA_WRID_DATA, |
168 | 2da776db | Michael R. Hines | RDMA_WRID_CONTROL, |
169 | 2da776db | Michael R. Hines | RDMA_WRID_MAX, |
170 | 2da776db | Michael R. Hines | }; |
171 | 2da776db | Michael R. Hines | |
172 | 2da776db | Michael R. Hines | /*
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173 | 2da776db | Michael R. Hines | * SEND/RECV IB Control Messages.
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174 | 2da776db | Michael R. Hines | */
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175 | 2da776db | Michael R. Hines | enum {
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176 | 2da776db | Michael R. Hines | RDMA_CONTROL_NONE = 0,
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177 | 2da776db | Michael R. Hines | RDMA_CONTROL_ERROR, |
178 | 2da776db | Michael R. Hines | RDMA_CONTROL_READY, /* ready to receive */
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179 | 2da776db | Michael R. Hines | RDMA_CONTROL_QEMU_FILE, /* QEMUFile-transmitted bytes */
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180 | 2da776db | Michael R. Hines | RDMA_CONTROL_RAM_BLOCKS_REQUEST, /* RAMBlock synchronization */
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181 | 2da776db | Michael R. Hines | RDMA_CONTROL_RAM_BLOCKS_RESULT, /* RAMBlock synchronization */
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182 | 2da776db | Michael R. Hines | RDMA_CONTROL_COMPRESS, /* page contains repeat values */
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183 | 2da776db | Michael R. Hines | RDMA_CONTROL_REGISTER_REQUEST, /* dynamic page registration */
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184 | 2da776db | Michael R. Hines | RDMA_CONTROL_REGISTER_RESULT, /* key to use after registration */
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185 | 2da776db | Michael R. Hines | RDMA_CONTROL_REGISTER_FINISHED, /* current iteration finished */
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186 | 2da776db | Michael R. Hines | RDMA_CONTROL_UNREGISTER_REQUEST, /* dynamic UN-registration */
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187 | 2da776db | Michael R. Hines | RDMA_CONTROL_UNREGISTER_FINISHED, /* unpinning finished */
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188 | 2da776db | Michael R. Hines | }; |
189 | 2da776db | Michael R. Hines | |
190 | 2da776db | Michael R. Hines | const char *control_desc[] = { |
191 | 2da776db | Michael R. Hines | [RDMA_CONTROL_NONE] = "NONE",
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192 | 2da776db | Michael R. Hines | [RDMA_CONTROL_ERROR] = "ERROR",
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193 | 2da776db | Michael R. Hines | [RDMA_CONTROL_READY] = "READY",
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194 | 2da776db | Michael R. Hines | [RDMA_CONTROL_QEMU_FILE] = "QEMU FILE",
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195 | 2da776db | Michael R. Hines | [RDMA_CONTROL_RAM_BLOCKS_REQUEST] = "RAM BLOCKS REQUEST",
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196 | 2da776db | Michael R. Hines | [RDMA_CONTROL_RAM_BLOCKS_RESULT] = "RAM BLOCKS RESULT",
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197 | 2da776db | Michael R. Hines | [RDMA_CONTROL_COMPRESS] = "COMPRESS",
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198 | 2da776db | Michael R. Hines | [RDMA_CONTROL_REGISTER_REQUEST] = "REGISTER REQUEST",
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199 | 2da776db | Michael R. Hines | [RDMA_CONTROL_REGISTER_RESULT] = "REGISTER RESULT",
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200 | 2da776db | Michael R. Hines | [RDMA_CONTROL_REGISTER_FINISHED] = "REGISTER FINISHED",
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201 | 2da776db | Michael R. Hines | [RDMA_CONTROL_UNREGISTER_REQUEST] = "UNREGISTER REQUEST",
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202 | 2da776db | Michael R. Hines | [RDMA_CONTROL_UNREGISTER_FINISHED] = "UNREGISTER FINISHED",
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203 | 2da776db | Michael R. Hines | }; |
204 | 2da776db | Michael R. Hines | |
205 | 2da776db | Michael R. Hines | /*
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206 | 2da776db | Michael R. Hines | * Memory and MR structures used to represent an IB Send/Recv work request.
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207 | 2da776db | Michael R. Hines | * This is *not* used for RDMA writes, only IB Send/Recv.
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208 | 2da776db | Michael R. Hines | */
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209 | 2da776db | Michael R. Hines | typedef struct { |
210 | 2da776db | Michael R. Hines | uint8_t control[RDMA_CONTROL_MAX_BUFFER]; /* actual buffer to register */
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211 | 2da776db | Michael R. Hines | struct ibv_mr *control_mr; /* registration metadata */ |
212 | 2da776db | Michael R. Hines | size_t control_len; /* length of the message */
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213 | 2da776db | Michael R. Hines | uint8_t *control_curr; /* start of unconsumed bytes */
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214 | 2da776db | Michael R. Hines | } RDMAWorkRequestData; |
215 | 2da776db | Michael R. Hines | |
216 | 2da776db | Michael R. Hines | /*
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217 | 2da776db | Michael R. Hines | * Negotiate RDMA capabilities during connection-setup time.
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218 | 2da776db | Michael R. Hines | */
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219 | 2da776db | Michael R. Hines | typedef struct { |
220 | 2da776db | Michael R. Hines | uint32_t version; |
221 | 2da776db | Michael R. Hines | uint32_t flags; |
222 | 2da776db | Michael R. Hines | } RDMACapabilities; |
223 | 2da776db | Michael R. Hines | |
224 | 2da776db | Michael R. Hines | static void caps_to_network(RDMACapabilities *cap) |
225 | 2da776db | Michael R. Hines | { |
226 | 2da776db | Michael R. Hines | cap->version = htonl(cap->version); |
227 | 2da776db | Michael R. Hines | cap->flags = htonl(cap->flags); |
228 | 2da776db | Michael R. Hines | } |
229 | 2da776db | Michael R. Hines | |
230 | 2da776db | Michael R. Hines | static void network_to_caps(RDMACapabilities *cap) |
231 | 2da776db | Michael R. Hines | { |
232 | 2da776db | Michael R. Hines | cap->version = ntohl(cap->version); |
233 | 2da776db | Michael R. Hines | cap->flags = ntohl(cap->flags); |
234 | 2da776db | Michael R. Hines | } |
235 | 2da776db | Michael R. Hines | |
236 | 2da776db | Michael R. Hines | /*
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237 | 2da776db | Michael R. Hines | * Representation of a RAMBlock from an RDMA perspective.
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238 | 2da776db | Michael R. Hines | * This is not transmitted, only local.
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239 | 2da776db | Michael R. Hines | * This and subsequent structures cannot be linked lists
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240 | 2da776db | Michael R. Hines | * because we're using a single IB message to transmit
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241 | 2da776db | Michael R. Hines | * the information. It's small anyway, so a list is overkill.
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242 | 2da776db | Michael R. Hines | */
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243 | 2da776db | Michael R. Hines | typedef struct RDMALocalBlock { |
244 | 2da776db | Michael R. Hines | uint8_t *local_host_addr; /* local virtual address */
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245 | 2da776db | Michael R. Hines | uint64_t remote_host_addr; /* remote virtual address */
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246 | 2da776db | Michael R. Hines | uint64_t offset; |
247 | 2da776db | Michael R. Hines | uint64_t length; |
248 | 2da776db | Michael R. Hines | struct ibv_mr **pmr; /* MRs for chunk-level registration */ |
249 | 2da776db | Michael R. Hines | struct ibv_mr *mr; /* MR for non-chunk-level registration */ |
250 | 2da776db | Michael R. Hines | uint32_t *remote_keys; /* rkeys for chunk-level registration */
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251 | 2da776db | Michael R. Hines | uint32_t remote_rkey; /* rkeys for non-chunk-level registration */
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252 | 2da776db | Michael R. Hines | int index; /* which block are we */ |
253 | 2da776db | Michael R. Hines | bool is_ram_block;
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254 | 2da776db | Michael R. Hines | int nb_chunks;
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255 | 2da776db | Michael R. Hines | unsigned long *transit_bitmap; |
256 | 2da776db | Michael R. Hines | unsigned long *unregister_bitmap; |
257 | 2da776db | Michael R. Hines | } RDMALocalBlock; |
258 | 2da776db | Michael R. Hines | |
259 | 2da776db | Michael R. Hines | /*
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260 | 2da776db | Michael R. Hines | * Also represents a RAMblock, but only on the dest.
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261 | 2da776db | Michael R. Hines | * This gets transmitted by the dest during connection-time
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262 | 2da776db | Michael R. Hines | * to the source VM and then is used to populate the
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263 | 2da776db | Michael R. Hines | * corresponding RDMALocalBlock with
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264 | 2da776db | Michael R. Hines | * the information needed to perform the actual RDMA.
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265 | 2da776db | Michael R. Hines | */
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266 | 2da776db | Michael R. Hines | typedef struct QEMU_PACKED RDMARemoteBlock { |
267 | 2da776db | Michael R. Hines | uint64_t remote_host_addr; |
268 | 2da776db | Michael R. Hines | uint64_t offset; |
269 | 2da776db | Michael R. Hines | uint64_t length; |
270 | 2da776db | Michael R. Hines | uint32_t remote_rkey; |
271 | 2da776db | Michael R. Hines | uint32_t padding; |
272 | 2da776db | Michael R. Hines | } RDMARemoteBlock; |
273 | 2da776db | Michael R. Hines | |
274 | 2da776db | Michael R. Hines | static uint64_t htonll(uint64_t v)
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275 | 2da776db | Michael R. Hines | { |
276 | 2da776db | Michael R. Hines | union { uint32_t lv[2]; uint64_t llv; } u; |
277 | 2da776db | Michael R. Hines | u.lv[0] = htonl(v >> 32); |
278 | 2da776db | Michael R. Hines | u.lv[1] = htonl(v & 0xFFFFFFFFULL); |
279 | 2da776db | Michael R. Hines | return u.llv;
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280 | 2da776db | Michael R. Hines | } |
281 | 2da776db | Michael R. Hines | |
282 | 2da776db | Michael R. Hines | static uint64_t ntohll(uint64_t v) {
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283 | 2da776db | Michael R. Hines | union { uint32_t lv[2]; uint64_t llv; } u; |
284 | 2da776db | Michael R. Hines | u.llv = v; |
285 | 2da776db | Michael R. Hines | return ((uint64_t)ntohl(u.lv[0]) << 32) | (uint64_t) ntohl(u.lv[1]); |
286 | 2da776db | Michael R. Hines | } |
287 | 2da776db | Michael R. Hines | |
288 | 2da776db | Michael R. Hines | static void remote_block_to_network(RDMARemoteBlock *rb) |
289 | 2da776db | Michael R. Hines | { |
290 | 2da776db | Michael R. Hines | rb->remote_host_addr = htonll(rb->remote_host_addr); |
291 | 2da776db | Michael R. Hines | rb->offset = htonll(rb->offset); |
292 | 2da776db | Michael R. Hines | rb->length = htonll(rb->length); |
293 | 2da776db | Michael R. Hines | rb->remote_rkey = htonl(rb->remote_rkey); |
294 | 2da776db | Michael R. Hines | } |
295 | 2da776db | Michael R. Hines | |
296 | 2da776db | Michael R. Hines | static void network_to_remote_block(RDMARemoteBlock *rb) |
297 | 2da776db | Michael R. Hines | { |
298 | 2da776db | Michael R. Hines | rb->remote_host_addr = ntohll(rb->remote_host_addr); |
299 | 2da776db | Michael R. Hines | rb->offset = ntohll(rb->offset); |
300 | 2da776db | Michael R. Hines | rb->length = ntohll(rb->length); |
301 | 2da776db | Michael R. Hines | rb->remote_rkey = ntohl(rb->remote_rkey); |
302 | 2da776db | Michael R. Hines | } |
303 | 2da776db | Michael R. Hines | |
304 | 2da776db | Michael R. Hines | /*
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305 | 2da776db | Michael R. Hines | * Virtual address of the above structures used for transmitting
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306 | 2da776db | Michael R. Hines | * the RAMBlock descriptions at connection-time.
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307 | 2da776db | Michael R. Hines | * This structure is *not* transmitted.
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308 | 2da776db | Michael R. Hines | */
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309 | 2da776db | Michael R. Hines | typedef struct RDMALocalBlocks { |
310 | 2da776db | Michael R. Hines | int nb_blocks;
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311 | 2da776db | Michael R. Hines | bool init; /* main memory init complete */ |
312 | 2da776db | Michael R. Hines | RDMALocalBlock *block; |
313 | 2da776db | Michael R. Hines | } RDMALocalBlocks; |
314 | 2da776db | Michael R. Hines | |
315 | 2da776db | Michael R. Hines | /*
|
316 | 2da776db | Michael R. Hines | * Main data structure for RDMA state.
|
317 | 2da776db | Michael R. Hines | * While there is only one copy of this structure being allocated right now,
|
318 | 2da776db | Michael R. Hines | * this is the place where one would start if you wanted to consider
|
319 | 2da776db | Michael R. Hines | * having more than one RDMA connection open at the same time.
|
320 | 2da776db | Michael R. Hines | */
|
321 | 2da776db | Michael R. Hines | typedef struct RDMAContext { |
322 | 2da776db | Michael R. Hines | char *host;
|
323 | 2da776db | Michael R. Hines | int port;
|
324 | 2da776db | Michael R. Hines | |
325 | 2da776db | Michael R. Hines | RDMAWorkRequestData wr_data[RDMA_WRID_MAX + 1];
|
326 | 2da776db | Michael R. Hines | |
327 | 2da776db | Michael R. Hines | /*
|
328 | 2da776db | Michael R. Hines | * This is used by *_exchange_send() to figure out whether or not
|
329 | 2da776db | Michael R. Hines | * the initial "READY" message has already been received or not.
|
330 | 2da776db | Michael R. Hines | * This is because other functions may potentially poll() and detect
|
331 | 2da776db | Michael R. Hines | * the READY message before send() does, in which case we need to
|
332 | 2da776db | Michael R. Hines | * know if it completed.
|
333 | 2da776db | Michael R. Hines | */
|
334 | 2da776db | Michael R. Hines | int control_ready_expected;
|
335 | 2da776db | Michael R. Hines | |
336 | 2da776db | Michael R. Hines | /* number of outstanding writes */
|
337 | 2da776db | Michael R. Hines | int nb_sent;
|
338 | 2da776db | Michael R. Hines | |
339 | 2da776db | Michael R. Hines | /* store info about current buffer so that we can
|
340 | 2da776db | Michael R. Hines | merge it with future sends */
|
341 | 2da776db | Michael R. Hines | uint64_t current_addr; |
342 | 2da776db | Michael R. Hines | uint64_t current_length; |
343 | 2da776db | Michael R. Hines | /* index of ram block the current buffer belongs to */
|
344 | 2da776db | Michael R. Hines | int current_index;
|
345 | 2da776db | Michael R. Hines | /* index of the chunk in the current ram block */
|
346 | 2da776db | Michael R. Hines | int current_chunk;
|
347 | 2da776db | Michael R. Hines | |
348 | 2da776db | Michael R. Hines | bool pin_all;
|
349 | 2da776db | Michael R. Hines | |
350 | 2da776db | Michael R. Hines | /*
|
351 | 2da776db | Michael R. Hines | * infiniband-specific variables for opening the device
|
352 | 2da776db | Michael R. Hines | * and maintaining connection state and so forth.
|
353 | 2da776db | Michael R. Hines | *
|
354 | 2da776db | Michael R. Hines | * cm_id also has ibv_context, rdma_event_channel, and ibv_qp in
|
355 | 2da776db | Michael R. Hines | * cm_id->verbs, cm_id->channel, and cm_id->qp.
|
356 | 2da776db | Michael R. Hines | */
|
357 | 2da776db | Michael R. Hines | struct rdma_cm_id *cm_id; /* connection manager ID */ |
358 | 2da776db | Michael R. Hines | struct rdma_cm_id *listen_id;
|
359 | 2da776db | Michael R. Hines | |
360 | 2da776db | Michael R. Hines | struct ibv_context *verbs;
|
361 | 2da776db | Michael R. Hines | struct rdma_event_channel *channel;
|
362 | 2da776db | Michael R. Hines | struct ibv_qp *qp; /* queue pair */ |
363 | 2da776db | Michael R. Hines | struct ibv_comp_channel *comp_channel; /* completion channel */ |
364 | 2da776db | Michael R. Hines | struct ibv_pd *pd; /* protection domain */ |
365 | 2da776db | Michael R. Hines | struct ibv_cq *cq; /* completion queue */ |
366 | 2da776db | Michael R. Hines | |
367 | 2da776db | Michael R. Hines | /*
|
368 | 2da776db | Michael R. Hines | * If a previous write failed (perhaps because of a failed
|
369 | 2da776db | Michael R. Hines | * memory registration, then do not attempt any future work
|
370 | 2da776db | Michael R. Hines | * and remember the error state.
|
371 | 2da776db | Michael R. Hines | */
|
372 | 2da776db | Michael R. Hines | int error_state;
|
373 | 2da776db | Michael R. Hines | int error_reported;
|
374 | 2da776db | Michael R. Hines | |
375 | 2da776db | Michael R. Hines | /*
|
376 | 2da776db | Michael R. Hines | * Description of ram blocks used throughout the code.
|
377 | 2da776db | Michael R. Hines | */
|
378 | 2da776db | Michael R. Hines | RDMALocalBlocks local_ram_blocks; |
379 | 2da776db | Michael R. Hines | RDMARemoteBlock *block; |
380 | 2da776db | Michael R. Hines | |
381 | 2da776db | Michael R. Hines | /*
|
382 | 2da776db | Michael R. Hines | * Migration on *destination* started.
|
383 | 2da776db | Michael R. Hines | * Then use coroutine yield function.
|
384 | 2da776db | Michael R. Hines | * Source runs in a thread, so we don't care.
|
385 | 2da776db | Michael R. Hines | */
|
386 | 2da776db | Michael R. Hines | int migration_started_on_destination;
|
387 | 2da776db | Michael R. Hines | |
388 | 2da776db | Michael R. Hines | int total_registrations;
|
389 | 2da776db | Michael R. Hines | int total_writes;
|
390 | 2da776db | Michael R. Hines | |
391 | 2da776db | Michael R. Hines | int unregister_current, unregister_next;
|
392 | 2da776db | Michael R. Hines | uint64_t unregistrations[RDMA_SIGNALED_SEND_MAX]; |
393 | 2da776db | Michael R. Hines | |
394 | 2da776db | Michael R. Hines | GHashTable *blockmap; |
395 | 2da776db | Michael R. Hines | } RDMAContext; |
396 | 2da776db | Michael R. Hines | |
397 | 2da776db | Michael R. Hines | /*
|
398 | 2da776db | Michael R. Hines | * Interface to the rest of the migration call stack.
|
399 | 2da776db | Michael R. Hines | */
|
400 | 2da776db | Michael R. Hines | typedef struct QEMUFileRDMA { |
401 | 2da776db | Michael R. Hines | RDMAContext *rdma; |
402 | 2da776db | Michael R. Hines | size_t len; |
403 | 2da776db | Michael R. Hines | void *file;
|
404 | 2da776db | Michael R. Hines | } QEMUFileRDMA; |
405 | 2da776db | Michael R. Hines | |
406 | 2da776db | Michael R. Hines | /*
|
407 | 2da776db | Michael R. Hines | * Main structure for IB Send/Recv control messages.
|
408 | 2da776db | Michael R. Hines | * This gets prepended at the beginning of every Send/Recv.
|
409 | 2da776db | Michael R. Hines | */
|
410 | 2da776db | Michael R. Hines | typedef struct QEMU_PACKED { |
411 | 2da776db | Michael R. Hines | uint32_t len; /* Total length of data portion */
|
412 | 2da776db | Michael R. Hines | uint32_t type; /* which control command to perform */
|
413 | 2da776db | Michael R. Hines | uint32_t repeat; /* number of commands in data portion of same type */
|
414 | 2da776db | Michael R. Hines | uint32_t padding; |
415 | 2da776db | Michael R. Hines | } RDMAControlHeader; |
416 | 2da776db | Michael R. Hines | |
417 | 2da776db | Michael R. Hines | static void control_to_network(RDMAControlHeader *control) |
418 | 2da776db | Michael R. Hines | { |
419 | 2da776db | Michael R. Hines | control->type = htonl(control->type); |
420 | 2da776db | Michael R. Hines | control->len = htonl(control->len); |
421 | 2da776db | Michael R. Hines | control->repeat = htonl(control->repeat); |
422 | 2da776db | Michael R. Hines | } |
423 | 2da776db | Michael R. Hines | |
424 | 2da776db | Michael R. Hines | static void network_to_control(RDMAControlHeader *control) |
425 | 2da776db | Michael R. Hines | { |
426 | 2da776db | Michael R. Hines | control->type = ntohl(control->type); |
427 | 2da776db | Michael R. Hines | control->len = ntohl(control->len); |
428 | 2da776db | Michael R. Hines | control->repeat = ntohl(control->repeat); |
429 | 2da776db | Michael R. Hines | } |
430 | 2da776db | Michael R. Hines | |
431 | 2da776db | Michael R. Hines | /*
|
432 | 2da776db | Michael R. Hines | * Register a single Chunk.
|
433 | 2da776db | Michael R. Hines | * Information sent by the source VM to inform the dest
|
434 | 2da776db | Michael R. Hines | * to register an single chunk of memory before we can perform
|
435 | 2da776db | Michael R. Hines | * the actual RDMA operation.
|
436 | 2da776db | Michael R. Hines | */
|
437 | 2da776db | Michael R. Hines | typedef struct QEMU_PACKED { |
438 | 2da776db | Michael R. Hines | union QEMU_PACKED {
|
439 | 2da776db | Michael R. Hines | uint64_t current_addr; /* offset into the ramblock of the chunk */
|
440 | 2da776db | Michael R. Hines | uint64_t chunk; /* chunk to lookup if unregistering */
|
441 | 2da776db | Michael R. Hines | } key; |
442 | 2da776db | Michael R. Hines | uint32_t current_index; /* which ramblock the chunk belongs to */
|
443 | 2da776db | Michael R. Hines | uint32_t padding; |
444 | 2da776db | Michael R. Hines | uint64_t chunks; /* how many sequential chunks to register */
|
445 | 2da776db | Michael R. Hines | } RDMARegister; |
446 | 2da776db | Michael R. Hines | |
447 | 2da776db | Michael R. Hines | static void register_to_network(RDMARegister *reg) |
448 | 2da776db | Michael R. Hines | { |
449 | 2da776db | Michael R. Hines | reg->key.current_addr = htonll(reg->key.current_addr); |
450 | 2da776db | Michael R. Hines | reg->current_index = htonl(reg->current_index); |
451 | 2da776db | Michael R. Hines | reg->chunks = htonll(reg->chunks); |
452 | 2da776db | Michael R. Hines | } |
453 | 2da776db | Michael R. Hines | |
454 | 2da776db | Michael R. Hines | static void network_to_register(RDMARegister *reg) |
455 | 2da776db | Michael R. Hines | { |
456 | 2da776db | Michael R. Hines | reg->key.current_addr = ntohll(reg->key.current_addr); |
457 | 2da776db | Michael R. Hines | reg->current_index = ntohl(reg->current_index); |
458 | 2da776db | Michael R. Hines | reg->chunks = ntohll(reg->chunks); |
459 | 2da776db | Michael R. Hines | } |
460 | 2da776db | Michael R. Hines | |
461 | 2da776db | Michael R. Hines | typedef struct QEMU_PACKED { |
462 | 2da776db | Michael R. Hines | uint32_t value; /* if zero, we will madvise() */
|
463 | 2da776db | Michael R. Hines | uint32_t block_idx; /* which ram block index */
|
464 | 2da776db | Michael R. Hines | uint64_t offset; /* where in the remote ramblock this chunk */
|
465 | 2da776db | Michael R. Hines | uint64_t length; /* length of the chunk */
|
466 | 2da776db | Michael R. Hines | } RDMACompress; |
467 | 2da776db | Michael R. Hines | |
468 | 2da776db | Michael R. Hines | static void compress_to_network(RDMACompress *comp) |
469 | 2da776db | Michael R. Hines | { |
470 | 2da776db | Michael R. Hines | comp->value = htonl(comp->value); |
471 | 2da776db | Michael R. Hines | comp->block_idx = htonl(comp->block_idx); |
472 | 2da776db | Michael R. Hines | comp->offset = htonll(comp->offset); |
473 | 2da776db | Michael R. Hines | comp->length = htonll(comp->length); |
474 | 2da776db | Michael R. Hines | } |
475 | 2da776db | Michael R. Hines | |
476 | 2da776db | Michael R. Hines | static void network_to_compress(RDMACompress *comp) |
477 | 2da776db | Michael R. Hines | { |
478 | 2da776db | Michael R. Hines | comp->value = ntohl(comp->value); |
479 | 2da776db | Michael R. Hines | comp->block_idx = ntohl(comp->block_idx); |
480 | 2da776db | Michael R. Hines | comp->offset = ntohll(comp->offset); |
481 | 2da776db | Michael R. Hines | comp->length = ntohll(comp->length); |
482 | 2da776db | Michael R. Hines | } |
483 | 2da776db | Michael R. Hines | |
484 | 2da776db | Michael R. Hines | /*
|
485 | 2da776db | Michael R. Hines | * The result of the dest's memory registration produces an "rkey"
|
486 | 2da776db | Michael R. Hines | * which the source VM must reference in order to perform
|
487 | 2da776db | Michael R. Hines | * the RDMA operation.
|
488 | 2da776db | Michael R. Hines | */
|
489 | 2da776db | Michael R. Hines | typedef struct QEMU_PACKED { |
490 | 2da776db | Michael R. Hines | uint32_t rkey; |
491 | 2da776db | Michael R. Hines | uint32_t padding; |
492 | 2da776db | Michael R. Hines | uint64_t host_addr; |
493 | 2da776db | Michael R. Hines | } RDMARegisterResult; |
494 | 2da776db | Michael R. Hines | |
495 | 2da776db | Michael R. Hines | static void result_to_network(RDMARegisterResult *result) |
496 | 2da776db | Michael R. Hines | { |
497 | 2da776db | Michael R. Hines | result->rkey = htonl(result->rkey); |
498 | 2da776db | Michael R. Hines | result->host_addr = htonll(result->host_addr); |
499 | 2da776db | Michael R. Hines | }; |
500 | 2da776db | Michael R. Hines | |
501 | 2da776db | Michael R. Hines | static void network_to_result(RDMARegisterResult *result) |
502 | 2da776db | Michael R. Hines | { |
503 | 2da776db | Michael R. Hines | result->rkey = ntohl(result->rkey); |
504 | 2da776db | Michael R. Hines | result->host_addr = ntohll(result->host_addr); |
505 | 2da776db | Michael R. Hines | }; |
506 | 2da776db | Michael R. Hines | |
507 | 2da776db | Michael R. Hines | const char *print_wrid(int wrid); |
508 | 2da776db | Michael R. Hines | static int qemu_rdma_exchange_send(RDMAContext *rdma, RDMAControlHeader *head, |
509 | 2da776db | Michael R. Hines | uint8_t *data, RDMAControlHeader *resp, |
510 | 2da776db | Michael R. Hines | int *resp_idx,
|
511 | 2da776db | Michael R. Hines | int (*callback)(RDMAContext *rdma));
|
512 | 2da776db | Michael R. Hines | |
513 | 2da776db | Michael R. Hines | static inline uint64_t ram_chunk_index(uint8_t *start, uint8_t *host) |
514 | 2da776db | Michael R. Hines | { |
515 | 2da776db | Michael R. Hines | return ((uintptr_t) host - (uintptr_t) start) >> RDMA_REG_CHUNK_SHIFT;
|
516 | 2da776db | Michael R. Hines | } |
517 | 2da776db | Michael R. Hines | |
518 | 2da776db | Michael R. Hines | static inline uint8_t *ram_chunk_start(RDMALocalBlock *rdma_ram_block, |
519 | 2da776db | Michael R. Hines | uint64_t i) |
520 | 2da776db | Michael R. Hines | { |
521 | 2da776db | Michael R. Hines | return (uint8_t *) (((uintptr_t) rdma_ram_block->local_host_addr)
|
522 | 2da776db | Michael R. Hines | + (i << RDMA_REG_CHUNK_SHIFT)); |
523 | 2da776db | Michael R. Hines | } |
524 | 2da776db | Michael R. Hines | |
525 | 2da776db | Michael R. Hines | static inline uint8_t *ram_chunk_end(RDMALocalBlock *rdma_ram_block, uint64_t i) |
526 | 2da776db | Michael R. Hines | { |
527 | 2da776db | Michael R. Hines | uint8_t *result = ram_chunk_start(rdma_ram_block, i) + |
528 | 2da776db | Michael R. Hines | (1UL << RDMA_REG_CHUNK_SHIFT);
|
529 | 2da776db | Michael R. Hines | |
530 | 2da776db | Michael R. Hines | if (result > (rdma_ram_block->local_host_addr + rdma_ram_block->length)) {
|
531 | 2da776db | Michael R. Hines | result = rdma_ram_block->local_host_addr + rdma_ram_block->length; |
532 | 2da776db | Michael R. Hines | } |
533 | 2da776db | Michael R. Hines | |
534 | 2da776db | Michael R. Hines | return result;
|
535 | 2da776db | Michael R. Hines | } |
536 | 2da776db | Michael R. Hines | |
537 | 2da776db | Michael R. Hines | static int __qemu_rdma_add_block(RDMAContext *rdma, void *host_addr, |
538 | 2da776db | Michael R. Hines | ram_addr_t block_offset, uint64_t length) |
539 | 2da776db | Michael R. Hines | { |
540 | 2da776db | Michael R. Hines | RDMALocalBlocks *local = &rdma->local_ram_blocks; |
541 | 2da776db | Michael R. Hines | RDMALocalBlock *block = g_hash_table_lookup(rdma->blockmap, |
542 | 2da776db | Michael R. Hines | (void *) block_offset);
|
543 | 2da776db | Michael R. Hines | RDMALocalBlock *old = local->block; |
544 | 2da776db | Michael R. Hines | |
545 | 2da776db | Michael R. Hines | assert(block == NULL);
|
546 | 2da776db | Michael R. Hines | |
547 | 2da776db | Michael R. Hines | local->block = g_malloc0(sizeof(RDMALocalBlock) * (local->nb_blocks + 1)); |
548 | 2da776db | Michael R. Hines | |
549 | 2da776db | Michael R. Hines | if (local->nb_blocks) {
|
550 | 2da776db | Michael R. Hines | int x;
|
551 | 2da776db | Michael R. Hines | |
552 | 2da776db | Michael R. Hines | for (x = 0; x < local->nb_blocks; x++) { |
553 | 2da776db | Michael R. Hines | g_hash_table_remove(rdma->blockmap, (void *)old[x].offset);
|
554 | 2da776db | Michael R. Hines | g_hash_table_insert(rdma->blockmap, (void *)old[x].offset,
|
555 | 2da776db | Michael R. Hines | &local->block[x]); |
556 | 2da776db | Michael R. Hines | } |
557 | 2da776db | Michael R. Hines | memcpy(local->block, old, sizeof(RDMALocalBlock) * local->nb_blocks);
|
558 | 2da776db | Michael R. Hines | g_free(old); |
559 | 2da776db | Michael R. Hines | } |
560 | 2da776db | Michael R. Hines | |
561 | 2da776db | Michael R. Hines | block = &local->block[local->nb_blocks]; |
562 | 2da776db | Michael R. Hines | |
563 | 2da776db | Michael R. Hines | block->local_host_addr = host_addr; |
564 | 2da776db | Michael R. Hines | block->offset = block_offset; |
565 | 2da776db | Michael R. Hines | block->length = length; |
566 | 2da776db | Michael R. Hines | block->index = local->nb_blocks; |
567 | 2da776db | Michael R. Hines | block->nb_chunks = ram_chunk_index(host_addr, host_addr + length) + 1UL;
|
568 | 2da776db | Michael R. Hines | block->transit_bitmap = bitmap_new(block->nb_chunks); |
569 | 2da776db | Michael R. Hines | bitmap_clear(block->transit_bitmap, 0, block->nb_chunks);
|
570 | 2da776db | Michael R. Hines | block->unregister_bitmap = bitmap_new(block->nb_chunks); |
571 | 2da776db | Michael R. Hines | bitmap_clear(block->unregister_bitmap, 0, block->nb_chunks);
|
572 | 2da776db | Michael R. Hines | block->remote_keys = g_malloc0(block->nb_chunks * sizeof(uint32_t));
|
573 | 2da776db | Michael R. Hines | |
574 | 2da776db | Michael R. Hines | block->is_ram_block = local->init ? false : true; |
575 | 2da776db | Michael R. Hines | |
576 | 2da776db | Michael R. Hines | g_hash_table_insert(rdma->blockmap, (void *) block_offset, block);
|
577 | 2da776db | Michael R. Hines | |
578 | 2da776db | Michael R. Hines | DDPRINTF("Added Block: %d, addr: %" PRIu64 ", offset: %" PRIu64 |
579 | 2da776db | Michael R. Hines | " length: %" PRIu64 " end: %" PRIu64 " bits %" PRIu64 " chunks %d\n", |
580 | 2da776db | Michael R. Hines | local->nb_blocks, (uint64_t) block->local_host_addr, block->offset, |
581 | 2da776db | Michael R. Hines | block->length, (uint64_t) (block->local_host_addr + block->length), |
582 | 2da776db | Michael R. Hines | BITS_TO_LONGS(block->nb_chunks) * |
583 | 2da776db | Michael R. Hines | sizeof(unsigned long) * 8, block->nb_chunks); |
584 | 2da776db | Michael R. Hines | |
585 | 2da776db | Michael R. Hines | local->nb_blocks++; |
586 | 2da776db | Michael R. Hines | |
587 | 2da776db | Michael R. Hines | return 0; |
588 | 2da776db | Michael R. Hines | } |
589 | 2da776db | Michael R. Hines | |
590 | 2da776db | Michael R. Hines | /*
|
591 | 2da776db | Michael R. Hines | * Memory regions need to be registered with the device and queue pairs setup
|
592 | 2da776db | Michael R. Hines | * in advanced before the migration starts. This tells us where the RAM blocks
|
593 | 2da776db | Michael R. Hines | * are so that we can register them individually.
|
594 | 2da776db | Michael R. Hines | */
|
595 | 2da776db | Michael R. Hines | static void qemu_rdma_init_one_block(void *host_addr, |
596 | 2da776db | Michael R. Hines | ram_addr_t block_offset, ram_addr_t length, void *opaque)
|
597 | 2da776db | Michael R. Hines | { |
598 | 2da776db | Michael R. Hines | __qemu_rdma_add_block(opaque, host_addr, block_offset, length); |
599 | 2da776db | Michael R. Hines | } |
600 | 2da776db | Michael R. Hines | |
601 | 2da776db | Michael R. Hines | /*
|
602 | 2da776db | Michael R. Hines | * Identify the RAMBlocks and their quantity. They will be references to
|
603 | 2da776db | Michael R. Hines | * identify chunk boundaries inside each RAMBlock and also be referenced
|
604 | 2da776db | Michael R. Hines | * during dynamic page registration.
|
605 | 2da776db | Michael R. Hines | */
|
606 | 2da776db | Michael R. Hines | static int qemu_rdma_init_ram_blocks(RDMAContext *rdma) |
607 | 2da776db | Michael R. Hines | { |
608 | 2da776db | Michael R. Hines | RDMALocalBlocks *local = &rdma->local_ram_blocks; |
609 | 2da776db | Michael R. Hines | |
610 | 2da776db | Michael R. Hines | assert(rdma->blockmap == NULL);
|
611 | 2da776db | Michael R. Hines | rdma->blockmap = g_hash_table_new(g_direct_hash, g_direct_equal); |
612 | 2da776db | Michael R. Hines | memset(local, 0, sizeof *local); |
613 | 2da776db | Michael R. Hines | qemu_ram_foreach_block(qemu_rdma_init_one_block, rdma); |
614 | 2da776db | Michael R. Hines | DPRINTF("Allocated %d local ram block structures\n", local->nb_blocks);
|
615 | 2da776db | Michael R. Hines | rdma->block = (RDMARemoteBlock *) g_malloc0(sizeof(RDMARemoteBlock) *
|
616 | 2da776db | Michael R. Hines | rdma->local_ram_blocks.nb_blocks); |
617 | 2da776db | Michael R. Hines | local->init = true;
|
618 | 2da776db | Michael R. Hines | return 0; |
619 | 2da776db | Michael R. Hines | } |
620 | 2da776db | Michael R. Hines | |
621 | 2da776db | Michael R. Hines | static int __qemu_rdma_delete_block(RDMAContext *rdma, ram_addr_t block_offset) |
622 | 2da776db | Michael R. Hines | { |
623 | 2da776db | Michael R. Hines | RDMALocalBlocks *local = &rdma->local_ram_blocks; |
624 | 2da776db | Michael R. Hines | RDMALocalBlock *block = g_hash_table_lookup(rdma->blockmap, |
625 | 2da776db | Michael R. Hines | (void *) block_offset);
|
626 | 2da776db | Michael R. Hines | RDMALocalBlock *old = local->block; |
627 | 2da776db | Michael R. Hines | int x;
|
628 | 2da776db | Michael R. Hines | |
629 | 2da776db | Michael R. Hines | assert(block); |
630 | 2da776db | Michael R. Hines | |
631 | 2da776db | Michael R. Hines | if (block->pmr) {
|
632 | 2da776db | Michael R. Hines | int j;
|
633 | 2da776db | Michael R. Hines | |
634 | 2da776db | Michael R. Hines | for (j = 0; j < block->nb_chunks; j++) { |
635 | 2da776db | Michael R. Hines | if (!block->pmr[j]) {
|
636 | 2da776db | Michael R. Hines | continue;
|
637 | 2da776db | Michael R. Hines | } |
638 | 2da776db | Michael R. Hines | ibv_dereg_mr(block->pmr[j]); |
639 | 2da776db | Michael R. Hines | rdma->total_registrations--; |
640 | 2da776db | Michael R. Hines | } |
641 | 2da776db | Michael R. Hines | g_free(block->pmr); |
642 | 2da776db | Michael R. Hines | block->pmr = NULL;
|
643 | 2da776db | Michael R. Hines | } |
644 | 2da776db | Michael R. Hines | |
645 | 2da776db | Michael R. Hines | if (block->mr) {
|
646 | 2da776db | Michael R. Hines | ibv_dereg_mr(block->mr); |
647 | 2da776db | Michael R. Hines | rdma->total_registrations--; |
648 | 2da776db | Michael R. Hines | block->mr = NULL;
|
649 | 2da776db | Michael R. Hines | } |
650 | 2da776db | Michael R. Hines | |
651 | 2da776db | Michael R. Hines | g_free(block->transit_bitmap); |
652 | 2da776db | Michael R. Hines | block->transit_bitmap = NULL;
|
653 | 2da776db | Michael R. Hines | |
654 | 2da776db | Michael R. Hines | g_free(block->unregister_bitmap); |
655 | 2da776db | Michael R. Hines | block->unregister_bitmap = NULL;
|
656 | 2da776db | Michael R. Hines | |
657 | 2da776db | Michael R. Hines | g_free(block->remote_keys); |
658 | 2da776db | Michael R. Hines | block->remote_keys = NULL;
|
659 | 2da776db | Michael R. Hines | |
660 | 2da776db | Michael R. Hines | for (x = 0; x < local->nb_blocks; x++) { |
661 | 2da776db | Michael R. Hines | g_hash_table_remove(rdma->blockmap, (void *)old[x].offset);
|
662 | 2da776db | Michael R. Hines | } |
663 | 2da776db | Michael R. Hines | |
664 | 2da776db | Michael R. Hines | if (local->nb_blocks > 1) { |
665 | 2da776db | Michael R. Hines | |
666 | 2da776db | Michael R. Hines | local->block = g_malloc0(sizeof(RDMALocalBlock) *
|
667 | 2da776db | Michael R. Hines | (local->nb_blocks - 1));
|
668 | 2da776db | Michael R. Hines | |
669 | 2da776db | Michael R. Hines | if (block->index) {
|
670 | 2da776db | Michael R. Hines | memcpy(local->block, old, sizeof(RDMALocalBlock) * block->index);
|
671 | 2da776db | Michael R. Hines | } |
672 | 2da776db | Michael R. Hines | |
673 | 2da776db | Michael R. Hines | if (block->index < (local->nb_blocks - 1)) { |
674 | 2da776db | Michael R. Hines | memcpy(local->block + block->index, old + (block->index + 1),
|
675 | 2da776db | Michael R. Hines | sizeof(RDMALocalBlock) *
|
676 | 2da776db | Michael R. Hines | (local->nb_blocks - (block->index + 1)));
|
677 | 2da776db | Michael R. Hines | } |
678 | 2da776db | Michael R. Hines | } else {
|
679 | 2da776db | Michael R. Hines | assert(block == local->block); |
680 | 2da776db | Michael R. Hines | local->block = NULL;
|
681 | 2da776db | Michael R. Hines | } |
682 | 2da776db | Michael R. Hines | |
683 | 2da776db | Michael R. Hines | DDPRINTF("Deleted Block: %d, addr: %" PRIu64 ", offset: %" PRIu64 |
684 | 2da776db | Michael R. Hines | " length: %" PRIu64 " end: %" PRIu64 " bits %" PRIu64 " chunks %d\n", |
685 | 2da776db | Michael R. Hines | local->nb_blocks, (uint64_t) block->local_host_addr, block->offset, |
686 | 2da776db | Michael R. Hines | block->length, (uint64_t) (block->local_host_addr + block->length), |
687 | 2da776db | Michael R. Hines | BITS_TO_LONGS(block->nb_chunks) * |
688 | 2da776db | Michael R. Hines | sizeof(unsigned long) * 8, block->nb_chunks); |
689 | 2da776db | Michael R. Hines | |
690 | 2da776db | Michael R. Hines | g_free(old); |
691 | 2da776db | Michael R. Hines | |
692 | 2da776db | Michael R. Hines | local->nb_blocks--; |
693 | 2da776db | Michael R. Hines | |
694 | 2da776db | Michael R. Hines | if (local->nb_blocks) {
|
695 | 2da776db | Michael R. Hines | for (x = 0; x < local->nb_blocks; x++) { |
696 | 2da776db | Michael R. Hines | g_hash_table_insert(rdma->blockmap, (void *)local->block[x].offset,
|
697 | 2da776db | Michael R. Hines | &local->block[x]); |
698 | 2da776db | Michael R. Hines | } |
699 | 2da776db | Michael R. Hines | } |
700 | 2da776db | Michael R. Hines | |
701 | 2da776db | Michael R. Hines | return 0; |
702 | 2da776db | Michael R. Hines | } |
703 | 2da776db | Michael R. Hines | |
704 | 2da776db | Michael R. Hines | /*
|
705 | 2da776db | Michael R. Hines | * Put in the log file which RDMA device was opened and the details
|
706 | 2da776db | Michael R. Hines | * associated with that device.
|
707 | 2da776db | Michael R. Hines | */
|
708 | 2da776db | Michael R. Hines | static void qemu_rdma_dump_id(const char *who, struct ibv_context *verbs) |
709 | 2da776db | Michael R. Hines | { |
710 | 2da776db | Michael R. Hines | printf("%s RDMA Device opened: kernel name %s "
|
711 | 2da776db | Michael R. Hines | "uverbs device name %s, "
|
712 | 2da776db | Michael R. Hines | "infiniband_verbs class device path %s,"
|
713 | 2da776db | Michael R. Hines | " infiniband class device path %s\n",
|
714 | 2da776db | Michael R. Hines | who, |
715 | 2da776db | Michael R. Hines | verbs->device->name, |
716 | 2da776db | Michael R. Hines | verbs->device->dev_name, |
717 | 2da776db | Michael R. Hines | verbs->device->dev_path, |
718 | 2da776db | Michael R. Hines | verbs->device->ibdev_path); |
719 | 2da776db | Michael R. Hines | } |
720 | 2da776db | Michael R. Hines | |
721 | 2da776db | Michael R. Hines | /*
|
722 | 2da776db | Michael R. Hines | * Put in the log file the RDMA gid addressing information,
|
723 | 2da776db | Michael R. Hines | * useful for folks who have trouble understanding the
|
724 | 2da776db | Michael R. Hines | * RDMA device hierarchy in the kernel.
|
725 | 2da776db | Michael R. Hines | */
|
726 | 2da776db | Michael R. Hines | static void qemu_rdma_dump_gid(const char *who, struct rdma_cm_id *id) |
727 | 2da776db | Michael R. Hines | { |
728 | 2da776db | Michael R. Hines | char sgid[33]; |
729 | 2da776db | Michael R. Hines | char dgid[33]; |
730 | 2da776db | Michael R. Hines | inet_ntop(AF_INET6, &id->route.addr.addr.ibaddr.sgid, sgid, sizeof sgid);
|
731 | 2da776db | Michael R. Hines | inet_ntop(AF_INET6, &id->route.addr.addr.ibaddr.dgid, dgid, sizeof dgid);
|
732 | 2da776db | Michael R. Hines | DPRINTF("%s Source GID: %s, Dest GID: %s\n", who, sgid, dgid);
|
733 | 2da776db | Michael R. Hines | } |
734 | 2da776db | Michael R. Hines | |
735 | 2da776db | Michael R. Hines | /*
|
736 | 2da776db | Michael R. Hines | * Figure out which RDMA device corresponds to the requested IP hostname
|
737 | 2da776db | Michael R. Hines | * Also create the initial connection manager identifiers for opening
|
738 | 2da776db | Michael R. Hines | * the connection.
|
739 | 2da776db | Michael R. Hines | */
|
740 | 2da776db | Michael R. Hines | static int qemu_rdma_resolve_host(RDMAContext *rdma, Error **errp) |
741 | 2da776db | Michael R. Hines | { |
742 | 2da776db | Michael R. Hines | int ret;
|
743 | 2da776db | Michael R. Hines | struct addrinfo *res;
|
744 | 2da776db | Michael R. Hines | char port_str[16]; |
745 | 2da776db | Michael R. Hines | struct rdma_cm_event *cm_event;
|
746 | 2da776db | Michael R. Hines | char ip[40] = "unknown"; |
747 | 2da776db | Michael R. Hines | |
748 | 2da776db | Michael R. Hines | if (rdma->host == NULL || !strcmp(rdma->host, "")) { |
749 | 2da776db | Michael R. Hines | ERROR(errp, "RDMA hostname has not been set\n");
|
750 | 2da776db | Michael R. Hines | return -1; |
751 | 2da776db | Michael R. Hines | } |
752 | 2da776db | Michael R. Hines | |
753 | 2da776db | Michael R. Hines | /* create CM channel */
|
754 | 2da776db | Michael R. Hines | rdma->channel = rdma_create_event_channel(); |
755 | 2da776db | Michael R. Hines | if (!rdma->channel) {
|
756 | 2da776db | Michael R. Hines | ERROR(errp, "could not create CM channel\n");
|
757 | 2da776db | Michael R. Hines | return -1; |
758 | 2da776db | Michael R. Hines | } |
759 | 2da776db | Michael R. Hines | |
760 | 2da776db | Michael R. Hines | /* create CM id */
|
761 | 2da776db | Michael R. Hines | ret = rdma_create_id(rdma->channel, &rdma->cm_id, NULL, RDMA_PS_TCP);
|
762 | 2da776db | Michael R. Hines | if (ret) {
|
763 | 2da776db | Michael R. Hines | ERROR(errp, "could not create channel id\n");
|
764 | 2da776db | Michael R. Hines | goto err_resolve_create_id;
|
765 | 2da776db | Michael R. Hines | } |
766 | 2da776db | Michael R. Hines | |
767 | 2da776db | Michael R. Hines | snprintf(port_str, 16, "%d", rdma->port); |
768 | 2da776db | Michael R. Hines | port_str[15] = '\0'; |
769 | 2da776db | Michael R. Hines | |
770 | 2da776db | Michael R. Hines | ret = getaddrinfo(rdma->host, port_str, NULL, &res);
|
771 | 2da776db | Michael R. Hines | if (ret < 0) { |
772 | 2da776db | Michael R. Hines | ERROR(errp, "could not getaddrinfo address %s\n", rdma->host);
|
773 | 2da776db | Michael R. Hines | goto err_resolve_get_addr;
|
774 | 2da776db | Michael R. Hines | } |
775 | 2da776db | Michael R. Hines | |
776 | 2da776db | Michael R. Hines | inet_ntop(AF_INET, &((struct sockaddr_in *) res->ai_addr)->sin_addr,
|
777 | 2da776db | Michael R. Hines | ip, sizeof ip);
|
778 | 2da776db | Michael R. Hines | DPRINTF("%s => %s\n", rdma->host, ip);
|
779 | 2da776db | Michael R. Hines | |
780 | 2da776db | Michael R. Hines | /* resolve the first address */
|
781 | 2da776db | Michael R. Hines | ret = rdma_resolve_addr(rdma->cm_id, NULL, res->ai_addr,
|
782 | 2da776db | Michael R. Hines | RDMA_RESOLVE_TIMEOUT_MS); |
783 | 2da776db | Michael R. Hines | if (ret) {
|
784 | 2da776db | Michael R. Hines | ERROR(errp, "could not resolve address %s\n", rdma->host);
|
785 | 2da776db | Michael R. Hines | goto err_resolve_get_addr;
|
786 | 2da776db | Michael R. Hines | } |
787 | 2da776db | Michael R. Hines | |
788 | 2da776db | Michael R. Hines | qemu_rdma_dump_gid("source_resolve_addr", rdma->cm_id);
|
789 | 2da776db | Michael R. Hines | |
790 | 2da776db | Michael R. Hines | ret = rdma_get_cm_event(rdma->channel, &cm_event); |
791 | 2da776db | Michael R. Hines | if (ret) {
|
792 | 2da776db | Michael R. Hines | ERROR(errp, "could not perform event_addr_resolved\n");
|
793 | 2da776db | Michael R. Hines | goto err_resolve_get_addr;
|
794 | 2da776db | Michael R. Hines | } |
795 | 2da776db | Michael R. Hines | |
796 | 2da776db | Michael R. Hines | if (cm_event->event != RDMA_CM_EVENT_ADDR_RESOLVED) {
|
797 | 2da776db | Michael R. Hines | ERROR(errp, "result not equal to event_addr_resolved %s\n",
|
798 | 2da776db | Michael R. Hines | rdma_event_str(cm_event->event)); |
799 | 2da776db | Michael R. Hines | perror("rdma_resolve_addr");
|
800 | 2da776db | Michael R. Hines | goto err_resolve_get_addr;
|
801 | 2da776db | Michael R. Hines | } |
802 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
803 | 2da776db | Michael R. Hines | |
804 | 2da776db | Michael R. Hines | /* resolve route */
|
805 | 2da776db | Michael R. Hines | ret = rdma_resolve_route(rdma->cm_id, RDMA_RESOLVE_TIMEOUT_MS); |
806 | 2da776db | Michael R. Hines | if (ret) {
|
807 | 2da776db | Michael R. Hines | ERROR(errp, "could not resolve rdma route\n");
|
808 | 2da776db | Michael R. Hines | goto err_resolve_get_addr;
|
809 | 2da776db | Michael R. Hines | } |
810 | 2da776db | Michael R. Hines | |
811 | 2da776db | Michael R. Hines | ret = rdma_get_cm_event(rdma->channel, &cm_event); |
812 | 2da776db | Michael R. Hines | if (ret) {
|
813 | 2da776db | Michael R. Hines | ERROR(errp, "could not perform event_route_resolved\n");
|
814 | 2da776db | Michael R. Hines | goto err_resolve_get_addr;
|
815 | 2da776db | Michael R. Hines | } |
816 | 2da776db | Michael R. Hines | if (cm_event->event != RDMA_CM_EVENT_ROUTE_RESOLVED) {
|
817 | 2da776db | Michael R. Hines | ERROR(errp, "result not equal to event_route_resolved: %s\n",
|
818 | 2da776db | Michael R. Hines | rdma_event_str(cm_event->event)); |
819 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
820 | 2da776db | Michael R. Hines | goto err_resolve_get_addr;
|
821 | 2da776db | Michael R. Hines | } |
822 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
823 | 2da776db | Michael R. Hines | rdma->verbs = rdma->cm_id->verbs; |
824 | 2da776db | Michael R. Hines | qemu_rdma_dump_id("source_resolve_host", rdma->cm_id->verbs);
|
825 | 2da776db | Michael R. Hines | qemu_rdma_dump_gid("source_resolve_host", rdma->cm_id);
|
826 | 2da776db | Michael R. Hines | return 0; |
827 | 2da776db | Michael R. Hines | |
828 | 2da776db | Michael R. Hines | err_resolve_get_addr:
|
829 | 2da776db | Michael R. Hines | rdma_destroy_id(rdma->cm_id); |
830 | 2da776db | Michael R. Hines | rdma->cm_id = NULL;
|
831 | 2da776db | Michael R. Hines | err_resolve_create_id:
|
832 | 2da776db | Michael R. Hines | rdma_destroy_event_channel(rdma->channel); |
833 | 2da776db | Michael R. Hines | rdma->channel = NULL;
|
834 | 2da776db | Michael R. Hines | |
835 | 2da776db | Michael R. Hines | return -1; |
836 | 2da776db | Michael R. Hines | } |
837 | 2da776db | Michael R. Hines | |
838 | 2da776db | Michael R. Hines | /*
|
839 | 2da776db | Michael R. Hines | * Create protection domain and completion queues
|
840 | 2da776db | Michael R. Hines | */
|
841 | 2da776db | Michael R. Hines | static int qemu_rdma_alloc_pd_cq(RDMAContext *rdma) |
842 | 2da776db | Michael R. Hines | { |
843 | 2da776db | Michael R. Hines | /* allocate pd */
|
844 | 2da776db | Michael R. Hines | rdma->pd = ibv_alloc_pd(rdma->verbs); |
845 | 2da776db | Michael R. Hines | if (!rdma->pd) {
|
846 | 2da776db | Michael R. Hines | fprintf(stderr, "failed to allocate protection domain\n");
|
847 | 2da776db | Michael R. Hines | return -1; |
848 | 2da776db | Michael R. Hines | } |
849 | 2da776db | Michael R. Hines | |
850 | 2da776db | Michael R. Hines | /* create completion channel */
|
851 | 2da776db | Michael R. Hines | rdma->comp_channel = ibv_create_comp_channel(rdma->verbs); |
852 | 2da776db | Michael R. Hines | if (!rdma->comp_channel) {
|
853 | 2da776db | Michael R. Hines | fprintf(stderr, "failed to allocate completion channel\n");
|
854 | 2da776db | Michael R. Hines | goto err_alloc_pd_cq;
|
855 | 2da776db | Michael R. Hines | } |
856 | 2da776db | Michael R. Hines | |
857 | 2da776db | Michael R. Hines | /*
|
858 | 2da776db | Michael R. Hines | * Completion queue can be filled by both read and write work requests,
|
859 | 2da776db | Michael R. Hines | * so must reflect the sum of both possible queue sizes.
|
860 | 2da776db | Michael R. Hines | */
|
861 | 2da776db | Michael R. Hines | rdma->cq = ibv_create_cq(rdma->verbs, (RDMA_SIGNALED_SEND_MAX * 3),
|
862 | 2da776db | Michael R. Hines | NULL, rdma->comp_channel, 0); |
863 | 2da776db | Michael R. Hines | if (!rdma->cq) {
|
864 | 2da776db | Michael R. Hines | fprintf(stderr, "failed to allocate completion queue\n");
|
865 | 2da776db | Michael R. Hines | goto err_alloc_pd_cq;
|
866 | 2da776db | Michael R. Hines | } |
867 | 2da776db | Michael R. Hines | |
868 | 2da776db | Michael R. Hines | return 0; |
869 | 2da776db | Michael R. Hines | |
870 | 2da776db | Michael R. Hines | err_alloc_pd_cq:
|
871 | 2da776db | Michael R. Hines | if (rdma->pd) {
|
872 | 2da776db | Michael R. Hines | ibv_dealloc_pd(rdma->pd); |
873 | 2da776db | Michael R. Hines | } |
874 | 2da776db | Michael R. Hines | if (rdma->comp_channel) {
|
875 | 2da776db | Michael R. Hines | ibv_destroy_comp_channel(rdma->comp_channel); |
876 | 2da776db | Michael R. Hines | } |
877 | 2da776db | Michael R. Hines | rdma->pd = NULL;
|
878 | 2da776db | Michael R. Hines | rdma->comp_channel = NULL;
|
879 | 2da776db | Michael R. Hines | return -1; |
880 | 2da776db | Michael R. Hines | |
881 | 2da776db | Michael R. Hines | } |
882 | 2da776db | Michael R. Hines | |
883 | 2da776db | Michael R. Hines | /*
|
884 | 2da776db | Michael R. Hines | * Create queue pairs.
|
885 | 2da776db | Michael R. Hines | */
|
886 | 2da776db | Michael R. Hines | static int qemu_rdma_alloc_qp(RDMAContext *rdma) |
887 | 2da776db | Michael R. Hines | { |
888 | 2da776db | Michael R. Hines | struct ibv_qp_init_attr attr = { 0 }; |
889 | 2da776db | Michael R. Hines | int ret;
|
890 | 2da776db | Michael R. Hines | |
891 | 2da776db | Michael R. Hines | attr.cap.max_send_wr = RDMA_SIGNALED_SEND_MAX; |
892 | 2da776db | Michael R. Hines | attr.cap.max_recv_wr = 3;
|
893 | 2da776db | Michael R. Hines | attr.cap.max_send_sge = 1;
|
894 | 2da776db | Michael R. Hines | attr.cap.max_recv_sge = 1;
|
895 | 2da776db | Michael R. Hines | attr.send_cq = rdma->cq; |
896 | 2da776db | Michael R. Hines | attr.recv_cq = rdma->cq; |
897 | 2da776db | Michael R. Hines | attr.qp_type = IBV_QPT_RC; |
898 | 2da776db | Michael R. Hines | |
899 | 2da776db | Michael R. Hines | ret = rdma_create_qp(rdma->cm_id, rdma->pd, &attr); |
900 | 2da776db | Michael R. Hines | if (ret) {
|
901 | 2da776db | Michael R. Hines | return -1; |
902 | 2da776db | Michael R. Hines | } |
903 | 2da776db | Michael R. Hines | |
904 | 2da776db | Michael R. Hines | rdma->qp = rdma->cm_id->qp; |
905 | 2da776db | Michael R. Hines | return 0; |
906 | 2da776db | Michael R. Hines | } |
907 | 2da776db | Michael R. Hines | |
908 | 2da776db | Michael R. Hines | static int qemu_rdma_reg_whole_ram_blocks(RDMAContext *rdma) |
909 | 2da776db | Michael R. Hines | { |
910 | 2da776db | Michael R. Hines | int i;
|
911 | 2da776db | Michael R. Hines | RDMALocalBlocks *local = &rdma->local_ram_blocks; |
912 | 2da776db | Michael R. Hines | |
913 | 2da776db | Michael R. Hines | for (i = 0; i < local->nb_blocks; i++) { |
914 | 2da776db | Michael R. Hines | local->block[i].mr = |
915 | 2da776db | Michael R. Hines | ibv_reg_mr(rdma->pd, |
916 | 2da776db | Michael R. Hines | local->block[i].local_host_addr, |
917 | 2da776db | Michael R. Hines | local->block[i].length, |
918 | 2da776db | Michael R. Hines | IBV_ACCESS_LOCAL_WRITE | |
919 | 2da776db | Michael R. Hines | IBV_ACCESS_REMOTE_WRITE |
920 | 2da776db | Michael R. Hines | ); |
921 | 2da776db | Michael R. Hines | if (!local->block[i].mr) {
|
922 | 2da776db | Michael R. Hines | perror("Failed to register local dest ram block!\n");
|
923 | 2da776db | Michael R. Hines | break;
|
924 | 2da776db | Michael R. Hines | } |
925 | 2da776db | Michael R. Hines | rdma->total_registrations++; |
926 | 2da776db | Michael R. Hines | } |
927 | 2da776db | Michael R. Hines | |
928 | 2da776db | Michael R. Hines | if (i >= local->nb_blocks) {
|
929 | 2da776db | Michael R. Hines | return 0; |
930 | 2da776db | Michael R. Hines | } |
931 | 2da776db | Michael R. Hines | |
932 | 2da776db | Michael R. Hines | for (i--; i >= 0; i--) { |
933 | 2da776db | Michael R. Hines | ibv_dereg_mr(local->block[i].mr); |
934 | 2da776db | Michael R. Hines | rdma->total_registrations--; |
935 | 2da776db | Michael R. Hines | } |
936 | 2da776db | Michael R. Hines | |
937 | 2da776db | Michael R. Hines | return -1; |
938 | 2da776db | Michael R. Hines | |
939 | 2da776db | Michael R. Hines | } |
940 | 2da776db | Michael R. Hines | |
941 | 2da776db | Michael R. Hines | /*
|
942 | 2da776db | Michael R. Hines | * Find the ram block that corresponds to the page requested to be
|
943 | 2da776db | Michael R. Hines | * transmitted by QEMU.
|
944 | 2da776db | Michael R. Hines | *
|
945 | 2da776db | Michael R. Hines | * Once the block is found, also identify which 'chunk' within that
|
946 | 2da776db | Michael R. Hines | * block that the page belongs to.
|
947 | 2da776db | Michael R. Hines | *
|
948 | 2da776db | Michael R. Hines | * This search cannot fail or the migration will fail.
|
949 | 2da776db | Michael R. Hines | */
|
950 | 2da776db | Michael R. Hines | static int qemu_rdma_search_ram_block(RDMAContext *rdma, |
951 | 2da776db | Michael R. Hines | uint64_t block_offset, |
952 | 2da776db | Michael R. Hines | uint64_t offset, |
953 | 2da776db | Michael R. Hines | uint64_t length, |
954 | 2da776db | Michael R. Hines | uint64_t *block_index, |
955 | 2da776db | Michael R. Hines | uint64_t *chunk_index) |
956 | 2da776db | Michael R. Hines | { |
957 | 2da776db | Michael R. Hines | uint64_t current_addr = block_offset + offset; |
958 | 2da776db | Michael R. Hines | RDMALocalBlock *block = g_hash_table_lookup(rdma->blockmap, |
959 | 2da776db | Michael R. Hines | (void *) block_offset);
|
960 | 2da776db | Michael R. Hines | assert(block); |
961 | 2da776db | Michael R. Hines | assert(current_addr >= block->offset); |
962 | 2da776db | Michael R. Hines | assert((current_addr + length) <= (block->offset + block->length)); |
963 | 2da776db | Michael R. Hines | |
964 | 2da776db | Michael R. Hines | *block_index = block->index; |
965 | 2da776db | Michael R. Hines | *chunk_index = ram_chunk_index(block->local_host_addr, |
966 | 2da776db | Michael R. Hines | block->local_host_addr + (current_addr - block->offset)); |
967 | 2da776db | Michael R. Hines | |
968 | 2da776db | Michael R. Hines | return 0; |
969 | 2da776db | Michael R. Hines | } |
970 | 2da776db | Michael R. Hines | |
971 | 2da776db | Michael R. Hines | /*
|
972 | 2da776db | Michael R. Hines | * Register a chunk with IB. If the chunk was already registered
|
973 | 2da776db | Michael R. Hines | * previously, then skip.
|
974 | 2da776db | Michael R. Hines | *
|
975 | 2da776db | Michael R. Hines | * Also return the keys associated with the registration needed
|
976 | 2da776db | Michael R. Hines | * to perform the actual RDMA operation.
|
977 | 2da776db | Michael R. Hines | */
|
978 | 2da776db | Michael R. Hines | static int qemu_rdma_register_and_get_keys(RDMAContext *rdma, |
979 | 2da776db | Michael R. Hines | RDMALocalBlock *block, uint8_t *host_addr, |
980 | 2da776db | Michael R. Hines | uint32_t *lkey, uint32_t *rkey, int chunk,
|
981 | 2da776db | Michael R. Hines | uint8_t *chunk_start, uint8_t *chunk_end) |
982 | 2da776db | Michael R. Hines | { |
983 | 2da776db | Michael R. Hines | if (block->mr) {
|
984 | 2da776db | Michael R. Hines | if (lkey) {
|
985 | 2da776db | Michael R. Hines | *lkey = block->mr->lkey; |
986 | 2da776db | Michael R. Hines | } |
987 | 2da776db | Michael R. Hines | if (rkey) {
|
988 | 2da776db | Michael R. Hines | *rkey = block->mr->rkey; |
989 | 2da776db | Michael R. Hines | } |
990 | 2da776db | Michael R. Hines | return 0; |
991 | 2da776db | Michael R. Hines | } |
992 | 2da776db | Michael R. Hines | |
993 | 2da776db | Michael R. Hines | /* allocate memory to store chunk MRs */
|
994 | 2da776db | Michael R. Hines | if (!block->pmr) {
|
995 | 2da776db | Michael R. Hines | block->pmr = g_malloc0(block->nb_chunks * sizeof(struct ibv_mr *)); |
996 | 2da776db | Michael R. Hines | if (!block->pmr) {
|
997 | 2da776db | Michael R. Hines | return -1; |
998 | 2da776db | Michael R. Hines | } |
999 | 2da776db | Michael R. Hines | } |
1000 | 2da776db | Michael R. Hines | |
1001 | 2da776db | Michael R. Hines | /*
|
1002 | 2da776db | Michael R. Hines | * If 'rkey', then we're the destination, so grant access to the source.
|
1003 | 2da776db | Michael R. Hines | *
|
1004 | 2da776db | Michael R. Hines | * If 'lkey', then we're the source VM, so grant access only to ourselves.
|
1005 | 2da776db | Michael R. Hines | */
|
1006 | 2da776db | Michael R. Hines | if (!block->pmr[chunk]) {
|
1007 | 2da776db | Michael R. Hines | uint64_t len = chunk_end - chunk_start; |
1008 | 2da776db | Michael R. Hines | |
1009 | 2da776db | Michael R. Hines | DDPRINTF("Registering %" PRIu64 " bytes @ %p\n", |
1010 | 2da776db | Michael R. Hines | len, chunk_start); |
1011 | 2da776db | Michael R. Hines | |
1012 | 2da776db | Michael R. Hines | block->pmr[chunk] = ibv_reg_mr(rdma->pd, |
1013 | 2da776db | Michael R. Hines | chunk_start, len, |
1014 | 2da776db | Michael R. Hines | (rkey ? (IBV_ACCESS_LOCAL_WRITE | |
1015 | 2da776db | Michael R. Hines | IBV_ACCESS_REMOTE_WRITE) : 0));
|
1016 | 2da776db | Michael R. Hines | |
1017 | 2da776db | Michael R. Hines | if (!block->pmr[chunk]) {
|
1018 | 2da776db | Michael R. Hines | perror("Failed to register chunk!");
|
1019 | 2da776db | Michael R. Hines | fprintf(stderr, "Chunk details: block: %d chunk index %d"
|
1020 | 2da776db | Michael R. Hines | " start %" PRIu64 " end %" PRIu64 " host %" PRIu64 |
1021 | 2da776db | Michael R. Hines | " local %" PRIu64 " registrations: %d\n", |
1022 | 2da776db | Michael R. Hines | block->index, chunk, (uint64_t) chunk_start, |
1023 | 2da776db | Michael R. Hines | (uint64_t) chunk_end, (uint64_t) host_addr, |
1024 | 2da776db | Michael R. Hines | (uint64_t) block->local_host_addr, |
1025 | 2da776db | Michael R. Hines | rdma->total_registrations); |
1026 | 2da776db | Michael R. Hines | return -1; |
1027 | 2da776db | Michael R. Hines | } |
1028 | 2da776db | Michael R. Hines | rdma->total_registrations++; |
1029 | 2da776db | Michael R. Hines | } |
1030 | 2da776db | Michael R. Hines | |
1031 | 2da776db | Michael R. Hines | if (lkey) {
|
1032 | 2da776db | Michael R. Hines | *lkey = block->pmr[chunk]->lkey; |
1033 | 2da776db | Michael R. Hines | } |
1034 | 2da776db | Michael R. Hines | if (rkey) {
|
1035 | 2da776db | Michael R. Hines | *rkey = block->pmr[chunk]->rkey; |
1036 | 2da776db | Michael R. Hines | } |
1037 | 2da776db | Michael R. Hines | return 0; |
1038 | 2da776db | Michael R. Hines | } |
1039 | 2da776db | Michael R. Hines | |
1040 | 2da776db | Michael R. Hines | /*
|
1041 | 2da776db | Michael R. Hines | * Register (at connection time) the memory used for control
|
1042 | 2da776db | Michael R. Hines | * channel messages.
|
1043 | 2da776db | Michael R. Hines | */
|
1044 | 2da776db | Michael R. Hines | static int qemu_rdma_reg_control(RDMAContext *rdma, int idx) |
1045 | 2da776db | Michael R. Hines | { |
1046 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control_mr = ibv_reg_mr(rdma->pd, |
1047 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control, RDMA_CONTROL_MAX_BUFFER, |
1048 | 2da776db | Michael R. Hines | IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_WRITE); |
1049 | 2da776db | Michael R. Hines | if (rdma->wr_data[idx].control_mr) {
|
1050 | 2da776db | Michael R. Hines | rdma->total_registrations++; |
1051 | 2da776db | Michael R. Hines | return 0; |
1052 | 2da776db | Michael R. Hines | } |
1053 | 2da776db | Michael R. Hines | fprintf(stderr, "qemu_rdma_reg_control failed!\n");
|
1054 | 2da776db | Michael R. Hines | return -1; |
1055 | 2da776db | Michael R. Hines | } |
1056 | 2da776db | Michael R. Hines | |
1057 | 2da776db | Michael R. Hines | const char *print_wrid(int wrid) |
1058 | 2da776db | Michael R. Hines | { |
1059 | 2da776db | Michael R. Hines | if (wrid >= RDMA_WRID_RECV_CONTROL) {
|
1060 | 2da776db | Michael R. Hines | return wrid_desc[RDMA_WRID_RECV_CONTROL];
|
1061 | 2da776db | Michael R. Hines | } |
1062 | 2da776db | Michael R. Hines | return wrid_desc[wrid];
|
1063 | 2da776db | Michael R. Hines | } |
1064 | 2da776db | Michael R. Hines | |
1065 | 2da776db | Michael R. Hines | /*
|
1066 | 2da776db | Michael R. Hines | * RDMA requires memory registration (mlock/pinning), but this is not good for
|
1067 | 2da776db | Michael R. Hines | * overcommitment.
|
1068 | 2da776db | Michael R. Hines | *
|
1069 | 2da776db | Michael R. Hines | * In preparation for the future where LRU information or workload-specific
|
1070 | 2da776db | Michael R. Hines | * writable writable working set memory access behavior is available to QEMU
|
1071 | 2da776db | Michael R. Hines | * it would be nice to have in place the ability to UN-register/UN-pin
|
1072 | 2da776db | Michael R. Hines | * particular memory regions from the RDMA hardware when it is determine that
|
1073 | 2da776db | Michael R. Hines | * those regions of memory will likely not be accessed again in the near future.
|
1074 | 2da776db | Michael R. Hines | *
|
1075 | 2da776db | Michael R. Hines | * While we do not yet have such information right now, the following
|
1076 | 2da776db | Michael R. Hines | * compile-time option allows us to perform a non-optimized version of this
|
1077 | 2da776db | Michael R. Hines | * behavior.
|
1078 | 2da776db | Michael R. Hines | *
|
1079 | 2da776db | Michael R. Hines | * By uncommenting this option, you will cause *all* RDMA transfers to be
|
1080 | 2da776db | Michael R. Hines | * unregistered immediately after the transfer completes on both sides of the
|
1081 | 2da776db | Michael R. Hines | * connection. This has no effect in 'rdma-pin-all' mode, only regular mode.
|
1082 | 2da776db | Michael R. Hines | *
|
1083 | 2da776db | Michael R. Hines | * This will have a terrible impact on migration performance, so until future
|
1084 | 2da776db | Michael R. Hines | * workload information or LRU information is available, do not attempt to use
|
1085 | 2da776db | Michael R. Hines | * this feature except for basic testing.
|
1086 | 2da776db | Michael R. Hines | */
|
1087 | 2da776db | Michael R. Hines | //#define RDMA_UNREGISTRATION_EXAMPLE
|
1088 | 2da776db | Michael R. Hines | |
1089 | 2da776db | Michael R. Hines | /*
|
1090 | 2da776db | Michael R. Hines | * Perform a non-optimized memory unregistration after every transfer
|
1091 | 2da776db | Michael R. Hines | * for demonsration purposes, only if pin-all is not requested.
|
1092 | 2da776db | Michael R. Hines | *
|
1093 | 2da776db | Michael R. Hines | * Potential optimizations:
|
1094 | 2da776db | Michael R. Hines | * 1. Start a new thread to run this function continuously
|
1095 | 2da776db | Michael R. Hines | - for bit clearing
|
1096 | 2da776db | Michael R. Hines | - and for receipt of unregister messages
|
1097 | 2da776db | Michael R. Hines | * 2. Use an LRU.
|
1098 | 2da776db | Michael R. Hines | * 3. Use workload hints.
|
1099 | 2da776db | Michael R. Hines | */
|
1100 | 2da776db | Michael R. Hines | static int qemu_rdma_unregister_waiting(RDMAContext *rdma) |
1101 | 2da776db | Michael R. Hines | { |
1102 | 2da776db | Michael R. Hines | while (rdma->unregistrations[rdma->unregister_current]) {
|
1103 | 2da776db | Michael R. Hines | int ret;
|
1104 | 2da776db | Michael R. Hines | uint64_t wr_id = rdma->unregistrations[rdma->unregister_current]; |
1105 | 2da776db | Michael R. Hines | uint64_t chunk = |
1106 | 2da776db | Michael R. Hines | (wr_id & RDMA_WRID_CHUNK_MASK) >> RDMA_WRID_CHUNK_SHIFT; |
1107 | 2da776db | Michael R. Hines | uint64_t index = |
1108 | 2da776db | Michael R. Hines | (wr_id & RDMA_WRID_BLOCK_MASK) >> RDMA_WRID_BLOCK_SHIFT; |
1109 | 2da776db | Michael R. Hines | RDMALocalBlock *block = |
1110 | 2da776db | Michael R. Hines | &(rdma->local_ram_blocks.block[index]); |
1111 | 2da776db | Michael R. Hines | RDMARegister reg = { .current_index = index }; |
1112 | 2da776db | Michael R. Hines | RDMAControlHeader resp = { .type = RDMA_CONTROL_UNREGISTER_FINISHED, |
1113 | 2da776db | Michael R. Hines | }; |
1114 | 2da776db | Michael R. Hines | RDMAControlHeader head = { .len = sizeof(RDMARegister),
|
1115 | 2da776db | Michael R. Hines | .type = RDMA_CONTROL_UNREGISTER_REQUEST, |
1116 | 2da776db | Michael R. Hines | .repeat = 1,
|
1117 | 2da776db | Michael R. Hines | }; |
1118 | 2da776db | Michael R. Hines | |
1119 | 2da776db | Michael R. Hines | DDPRINTF("Processing unregister for chunk: %" PRIu64
|
1120 | 2da776db | Michael R. Hines | " at position %d\n", chunk, rdma->unregister_current);
|
1121 | 2da776db | Michael R. Hines | |
1122 | 2da776db | Michael R. Hines | rdma->unregistrations[rdma->unregister_current] = 0;
|
1123 | 2da776db | Michael R. Hines | rdma->unregister_current++; |
1124 | 2da776db | Michael R. Hines | |
1125 | 2da776db | Michael R. Hines | if (rdma->unregister_current == RDMA_SIGNALED_SEND_MAX) {
|
1126 | 2da776db | Michael R. Hines | rdma->unregister_current = 0;
|
1127 | 2da776db | Michael R. Hines | } |
1128 | 2da776db | Michael R. Hines | |
1129 | 2da776db | Michael R. Hines | |
1130 | 2da776db | Michael R. Hines | /*
|
1131 | 2da776db | Michael R. Hines | * Unregistration is speculative (because migration is single-threaded
|
1132 | 2da776db | Michael R. Hines | * and we cannot break the protocol's inifinband message ordering).
|
1133 | 2da776db | Michael R. Hines | * Thus, if the memory is currently being used for transmission,
|
1134 | 2da776db | Michael R. Hines | * then abort the attempt to unregister and try again
|
1135 | 2da776db | Michael R. Hines | * later the next time a completion is received for this memory.
|
1136 | 2da776db | Michael R. Hines | */
|
1137 | 2da776db | Michael R. Hines | clear_bit(chunk, block->unregister_bitmap); |
1138 | 2da776db | Michael R. Hines | |
1139 | 2da776db | Michael R. Hines | if (test_bit(chunk, block->transit_bitmap)) {
|
1140 | 2da776db | Michael R. Hines | DDPRINTF("Cannot unregister inflight chunk: %" PRIu64 "\n", chunk); |
1141 | 2da776db | Michael R. Hines | continue;
|
1142 | 2da776db | Michael R. Hines | } |
1143 | 2da776db | Michael R. Hines | |
1144 | 2da776db | Michael R. Hines | DDPRINTF("Sending unregister for chunk: %" PRIu64 "\n", chunk); |
1145 | 2da776db | Michael R. Hines | |
1146 | 2da776db | Michael R. Hines | ret = ibv_dereg_mr(block->pmr[chunk]); |
1147 | 2da776db | Michael R. Hines | block->pmr[chunk] = NULL;
|
1148 | 2da776db | Michael R. Hines | block->remote_keys[chunk] = 0;
|
1149 | 2da776db | Michael R. Hines | |
1150 | 2da776db | Michael R. Hines | if (ret != 0) { |
1151 | 2da776db | Michael R. Hines | perror("unregistration chunk failed");
|
1152 | 2da776db | Michael R. Hines | return -ret;
|
1153 | 2da776db | Michael R. Hines | } |
1154 | 2da776db | Michael R. Hines | rdma->total_registrations--; |
1155 | 2da776db | Michael R. Hines | |
1156 | 2da776db | Michael R. Hines | reg.key.chunk = chunk; |
1157 | 2da776db | Michael R. Hines | register_to_network(®); |
1158 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_send(rdma, &head, (uint8_t *) ®, |
1159 | 2da776db | Michael R. Hines | &resp, NULL, NULL); |
1160 | 2da776db | Michael R. Hines | if (ret < 0) { |
1161 | 2da776db | Michael R. Hines | return ret;
|
1162 | 2da776db | Michael R. Hines | } |
1163 | 2da776db | Michael R. Hines | |
1164 | 2da776db | Michael R. Hines | DDPRINTF("Unregister for chunk: %" PRIu64 " complete.\n", chunk); |
1165 | 2da776db | Michael R. Hines | } |
1166 | 2da776db | Michael R. Hines | |
1167 | 2da776db | Michael R. Hines | return 0; |
1168 | 2da776db | Michael R. Hines | } |
1169 | 2da776db | Michael R. Hines | |
1170 | 2da776db | Michael R. Hines | static uint64_t qemu_rdma_make_wrid(uint64_t wr_id, uint64_t index,
|
1171 | 2da776db | Michael R. Hines | uint64_t chunk) |
1172 | 2da776db | Michael R. Hines | { |
1173 | 2da776db | Michael R. Hines | uint64_t result = wr_id & RDMA_WRID_TYPE_MASK; |
1174 | 2da776db | Michael R. Hines | |
1175 | 2da776db | Michael R. Hines | result |= (index << RDMA_WRID_BLOCK_SHIFT); |
1176 | 2da776db | Michael R. Hines | result |= (chunk << RDMA_WRID_CHUNK_SHIFT); |
1177 | 2da776db | Michael R. Hines | |
1178 | 2da776db | Michael R. Hines | return result;
|
1179 | 2da776db | Michael R. Hines | } |
1180 | 2da776db | Michael R. Hines | |
1181 | 2da776db | Michael R. Hines | /*
|
1182 | 2da776db | Michael R. Hines | * Set bit for unregistration in the next iteration.
|
1183 | 2da776db | Michael R. Hines | * We cannot transmit right here, but will unpin later.
|
1184 | 2da776db | Michael R. Hines | */
|
1185 | 2da776db | Michael R. Hines | static void qemu_rdma_signal_unregister(RDMAContext *rdma, uint64_t index, |
1186 | 2da776db | Michael R. Hines | uint64_t chunk, uint64_t wr_id) |
1187 | 2da776db | Michael R. Hines | { |
1188 | 2da776db | Michael R. Hines | if (rdma->unregistrations[rdma->unregister_next] != 0) { |
1189 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: queue is full!\n");
|
1190 | 2da776db | Michael R. Hines | } else {
|
1191 | 2da776db | Michael R. Hines | RDMALocalBlock *block = &(rdma->local_ram_blocks.block[index]); |
1192 | 2da776db | Michael R. Hines | |
1193 | 2da776db | Michael R. Hines | if (!test_and_set_bit(chunk, block->unregister_bitmap)) {
|
1194 | 2da776db | Michael R. Hines | DDPRINTF("Appending unregister chunk %" PRIu64
|
1195 | 2da776db | Michael R. Hines | " at position %d\n", chunk, rdma->unregister_next);
|
1196 | 2da776db | Michael R. Hines | |
1197 | 2da776db | Michael R. Hines | rdma->unregistrations[rdma->unregister_next++] = |
1198 | 2da776db | Michael R. Hines | qemu_rdma_make_wrid(wr_id, index, chunk); |
1199 | 2da776db | Michael R. Hines | |
1200 | 2da776db | Michael R. Hines | if (rdma->unregister_next == RDMA_SIGNALED_SEND_MAX) {
|
1201 | 2da776db | Michael R. Hines | rdma->unregister_next = 0;
|
1202 | 2da776db | Michael R. Hines | } |
1203 | 2da776db | Michael R. Hines | } else {
|
1204 | 2da776db | Michael R. Hines | DDPRINTF("Unregister chunk %" PRIu64 " already in queue.\n", |
1205 | 2da776db | Michael R. Hines | chunk); |
1206 | 2da776db | Michael R. Hines | } |
1207 | 2da776db | Michael R. Hines | } |
1208 | 2da776db | Michael R. Hines | } |
1209 | 2da776db | Michael R. Hines | |
1210 | 2da776db | Michael R. Hines | /*
|
1211 | 2da776db | Michael R. Hines | * Consult the connection manager to see a work request
|
1212 | 2da776db | Michael R. Hines | * (of any kind) has completed.
|
1213 | 2da776db | Michael R. Hines | * Return the work request ID that completed.
|
1214 | 2da776db | Michael R. Hines | */
|
1215 | 2da776db | Michael R. Hines | static uint64_t qemu_rdma_poll(RDMAContext *rdma, uint64_t *wr_id_out)
|
1216 | 2da776db | Michael R. Hines | { |
1217 | 2da776db | Michael R. Hines | int ret;
|
1218 | 2da776db | Michael R. Hines | struct ibv_wc wc;
|
1219 | 2da776db | Michael R. Hines | uint64_t wr_id; |
1220 | 2da776db | Michael R. Hines | |
1221 | 2da776db | Michael R. Hines | ret = ibv_poll_cq(rdma->cq, 1, &wc);
|
1222 | 2da776db | Michael R. Hines | |
1223 | 2da776db | Michael R. Hines | if (!ret) {
|
1224 | 2da776db | Michael R. Hines | *wr_id_out = RDMA_WRID_NONE; |
1225 | 2da776db | Michael R. Hines | return 0; |
1226 | 2da776db | Michael R. Hines | } |
1227 | 2da776db | Michael R. Hines | |
1228 | 2da776db | Michael R. Hines | if (ret < 0) { |
1229 | 2da776db | Michael R. Hines | fprintf(stderr, "ibv_poll_cq return %d!\n", ret);
|
1230 | 2da776db | Michael R. Hines | return ret;
|
1231 | 2da776db | Michael R. Hines | } |
1232 | 2da776db | Michael R. Hines | |
1233 | 2da776db | Michael R. Hines | wr_id = wc.wr_id & RDMA_WRID_TYPE_MASK; |
1234 | 2da776db | Michael R. Hines | |
1235 | 2da776db | Michael R. Hines | if (wc.status != IBV_WC_SUCCESS) {
|
1236 | 2da776db | Michael R. Hines | fprintf(stderr, "ibv_poll_cq wc.status=%d %s!\n",
|
1237 | 2da776db | Michael R. Hines | wc.status, ibv_wc_status_str(wc.status)); |
1238 | 2da776db | Michael R. Hines | fprintf(stderr, "ibv_poll_cq wrid=%s!\n", wrid_desc[wr_id]);
|
1239 | 2da776db | Michael R. Hines | |
1240 | 2da776db | Michael R. Hines | return -1; |
1241 | 2da776db | Michael R. Hines | } |
1242 | 2da776db | Michael R. Hines | |
1243 | 2da776db | Michael R. Hines | if (rdma->control_ready_expected &&
|
1244 | 2da776db | Michael R. Hines | (wr_id >= RDMA_WRID_RECV_CONTROL)) { |
1245 | 2da776db | Michael R. Hines | DDDPRINTF("completion %s #%" PRId64 " received (%" PRId64 ")" |
1246 | 2da776db | Michael R. Hines | " left %d\n", wrid_desc[RDMA_WRID_RECV_CONTROL],
|
1247 | 2da776db | Michael R. Hines | wr_id - RDMA_WRID_RECV_CONTROL, wr_id, rdma->nb_sent); |
1248 | 2da776db | Michael R. Hines | rdma->control_ready_expected = 0;
|
1249 | 2da776db | Michael R. Hines | } |
1250 | 2da776db | Michael R. Hines | |
1251 | 2da776db | Michael R. Hines | if (wr_id == RDMA_WRID_RDMA_WRITE) {
|
1252 | 2da776db | Michael R. Hines | uint64_t chunk = |
1253 | 2da776db | Michael R. Hines | (wc.wr_id & RDMA_WRID_CHUNK_MASK) >> RDMA_WRID_CHUNK_SHIFT; |
1254 | 2da776db | Michael R. Hines | uint64_t index = |
1255 | 2da776db | Michael R. Hines | (wc.wr_id & RDMA_WRID_BLOCK_MASK) >> RDMA_WRID_BLOCK_SHIFT; |
1256 | 2da776db | Michael R. Hines | RDMALocalBlock *block = &(rdma->local_ram_blocks.block[index]); |
1257 | 2da776db | Michael R. Hines | |
1258 | 2da776db | Michael R. Hines | DDDPRINTF("completions %s (%" PRId64 ") left %d, " |
1259 | 2da776db | Michael R. Hines | "block %" PRIu64 ", chunk: %" PRIu64 " %p %p\n", |
1260 | 2da776db | Michael R. Hines | print_wrid(wr_id), wr_id, rdma->nb_sent, index, chunk, |
1261 | 2da776db | Michael R. Hines | block->local_host_addr, (void *)block->remote_host_addr);
|
1262 | 2da776db | Michael R. Hines | |
1263 | 2da776db | Michael R. Hines | clear_bit(chunk, block->transit_bitmap); |
1264 | 2da776db | Michael R. Hines | |
1265 | 2da776db | Michael R. Hines | if (rdma->nb_sent > 0) { |
1266 | 2da776db | Michael R. Hines | rdma->nb_sent--; |
1267 | 2da776db | Michael R. Hines | } |
1268 | 2da776db | Michael R. Hines | |
1269 | 2da776db | Michael R. Hines | if (!rdma->pin_all) {
|
1270 | 2da776db | Michael R. Hines | /*
|
1271 | 2da776db | Michael R. Hines | * FYI: If one wanted to signal a specific chunk to be unregistered
|
1272 | 2da776db | Michael R. Hines | * using LRU or workload-specific information, this is the function
|
1273 | 2da776db | Michael R. Hines | * you would call to do so. That chunk would then get asynchronously
|
1274 | 2da776db | Michael R. Hines | * unregistered later.
|
1275 | 2da776db | Michael R. Hines | */
|
1276 | 2da776db | Michael R. Hines | #ifdef RDMA_UNREGISTRATION_EXAMPLE
|
1277 | 2da776db | Michael R. Hines | qemu_rdma_signal_unregister(rdma, index, chunk, wc.wr_id); |
1278 | 2da776db | Michael R. Hines | #endif
|
1279 | 2da776db | Michael R. Hines | } |
1280 | 2da776db | Michael R. Hines | } else {
|
1281 | 2da776db | Michael R. Hines | DDDPRINTF("other completion %s (%" PRId64 ") received left %d\n", |
1282 | 2da776db | Michael R. Hines | print_wrid(wr_id), wr_id, rdma->nb_sent); |
1283 | 2da776db | Michael R. Hines | } |
1284 | 2da776db | Michael R. Hines | |
1285 | 2da776db | Michael R. Hines | *wr_id_out = wc.wr_id; |
1286 | 2da776db | Michael R. Hines | |
1287 | 2da776db | Michael R. Hines | return 0; |
1288 | 2da776db | Michael R. Hines | } |
1289 | 2da776db | Michael R. Hines | |
1290 | 2da776db | Michael R. Hines | /*
|
1291 | 2da776db | Michael R. Hines | * Block until the next work request has completed.
|
1292 | 2da776db | Michael R. Hines | *
|
1293 | 2da776db | Michael R. Hines | * First poll to see if a work request has already completed,
|
1294 | 2da776db | Michael R. Hines | * otherwise block.
|
1295 | 2da776db | Michael R. Hines | *
|
1296 | 2da776db | Michael R. Hines | * If we encounter completed work requests for IDs other than
|
1297 | 2da776db | Michael R. Hines | * the one we're interested in, then that's generally an error.
|
1298 | 2da776db | Michael R. Hines | *
|
1299 | 2da776db | Michael R. Hines | * The only exception is actual RDMA Write completions. These
|
1300 | 2da776db | Michael R. Hines | * completions only need to be recorded, but do not actually
|
1301 | 2da776db | Michael R. Hines | * need further processing.
|
1302 | 2da776db | Michael R. Hines | */
|
1303 | 2da776db | Michael R. Hines | static int qemu_rdma_block_for_wrid(RDMAContext *rdma, int wrid_requested) |
1304 | 2da776db | Michael R. Hines | { |
1305 | 2da776db | Michael R. Hines | int num_cq_events = 0, ret = 0; |
1306 | 2da776db | Michael R. Hines | struct ibv_cq *cq;
|
1307 | 2da776db | Michael R. Hines | void *cq_ctx;
|
1308 | 2da776db | Michael R. Hines | uint64_t wr_id = RDMA_WRID_NONE, wr_id_in; |
1309 | 2da776db | Michael R. Hines | |
1310 | 2da776db | Michael R. Hines | if (ibv_req_notify_cq(rdma->cq, 0)) { |
1311 | 2da776db | Michael R. Hines | return -1; |
1312 | 2da776db | Michael R. Hines | } |
1313 | 2da776db | Michael R. Hines | /* poll cq first */
|
1314 | 2da776db | Michael R. Hines | while (wr_id != wrid_requested) {
|
1315 | 2da776db | Michael R. Hines | ret = qemu_rdma_poll(rdma, &wr_id_in); |
1316 | 2da776db | Michael R. Hines | if (ret < 0) { |
1317 | 2da776db | Michael R. Hines | return ret;
|
1318 | 2da776db | Michael R. Hines | } |
1319 | 2da776db | Michael R. Hines | |
1320 | 2da776db | Michael R. Hines | wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; |
1321 | 2da776db | Michael R. Hines | |
1322 | 2da776db | Michael R. Hines | if (wr_id == RDMA_WRID_NONE) {
|
1323 | 2da776db | Michael R. Hines | break;
|
1324 | 2da776db | Michael R. Hines | } |
1325 | 2da776db | Michael R. Hines | if (wr_id != wrid_requested) {
|
1326 | 2da776db | Michael R. Hines | DDDPRINTF("A Wanted wrid %s (%d) but got %s (%" PRIu64 ")\n", |
1327 | 2da776db | Michael R. Hines | print_wrid(wrid_requested), |
1328 | 2da776db | Michael R. Hines | wrid_requested, print_wrid(wr_id), wr_id); |
1329 | 2da776db | Michael R. Hines | } |
1330 | 2da776db | Michael R. Hines | } |
1331 | 2da776db | Michael R. Hines | |
1332 | 2da776db | Michael R. Hines | if (wr_id == wrid_requested) {
|
1333 | 2da776db | Michael R. Hines | return 0; |
1334 | 2da776db | Michael R. Hines | } |
1335 | 2da776db | Michael R. Hines | |
1336 | 2da776db | Michael R. Hines | while (1) { |
1337 | 2da776db | Michael R. Hines | /*
|
1338 | 2da776db | Michael R. Hines | * Coroutine doesn't start until process_incoming_migration()
|
1339 | 2da776db | Michael R. Hines | * so don't yield unless we know we're running inside of a coroutine.
|
1340 | 2da776db | Michael R. Hines | */
|
1341 | 2da776db | Michael R. Hines | if (rdma->migration_started_on_destination) {
|
1342 | 2da776db | Michael R. Hines | yield_until_fd_readable(rdma->comp_channel->fd); |
1343 | 2da776db | Michael R. Hines | } |
1344 | 2da776db | Michael R. Hines | |
1345 | 2da776db | Michael R. Hines | if (ibv_get_cq_event(rdma->comp_channel, &cq, &cq_ctx)) {
|
1346 | 2da776db | Michael R. Hines | perror("ibv_get_cq_event");
|
1347 | 2da776db | Michael R. Hines | goto err_block_for_wrid;
|
1348 | 2da776db | Michael R. Hines | } |
1349 | 2da776db | Michael R. Hines | |
1350 | 2da776db | Michael R. Hines | num_cq_events++; |
1351 | 2da776db | Michael R. Hines | |
1352 | 2da776db | Michael R. Hines | if (ibv_req_notify_cq(cq, 0)) { |
1353 | 2da776db | Michael R. Hines | goto err_block_for_wrid;
|
1354 | 2da776db | Michael R. Hines | } |
1355 | 2da776db | Michael R. Hines | |
1356 | 2da776db | Michael R. Hines | while (wr_id != wrid_requested) {
|
1357 | 2da776db | Michael R. Hines | ret = qemu_rdma_poll(rdma, &wr_id_in); |
1358 | 2da776db | Michael R. Hines | if (ret < 0) { |
1359 | 2da776db | Michael R. Hines | goto err_block_for_wrid;
|
1360 | 2da776db | Michael R. Hines | } |
1361 | 2da776db | Michael R. Hines | |
1362 | 2da776db | Michael R. Hines | wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; |
1363 | 2da776db | Michael R. Hines | |
1364 | 2da776db | Michael R. Hines | if (wr_id == RDMA_WRID_NONE) {
|
1365 | 2da776db | Michael R. Hines | break;
|
1366 | 2da776db | Michael R. Hines | } |
1367 | 2da776db | Michael R. Hines | if (wr_id != wrid_requested) {
|
1368 | 2da776db | Michael R. Hines | DDDPRINTF("B Wanted wrid %s (%d) but got %s (%" PRIu64 ")\n", |
1369 | 2da776db | Michael R. Hines | print_wrid(wrid_requested), wrid_requested, |
1370 | 2da776db | Michael R. Hines | print_wrid(wr_id), wr_id); |
1371 | 2da776db | Michael R. Hines | } |
1372 | 2da776db | Michael R. Hines | } |
1373 | 2da776db | Michael R. Hines | |
1374 | 2da776db | Michael R. Hines | if (wr_id == wrid_requested) {
|
1375 | 2da776db | Michael R. Hines | goto success_block_for_wrid;
|
1376 | 2da776db | Michael R. Hines | } |
1377 | 2da776db | Michael R. Hines | } |
1378 | 2da776db | Michael R. Hines | |
1379 | 2da776db | Michael R. Hines | success_block_for_wrid:
|
1380 | 2da776db | Michael R. Hines | if (num_cq_events) {
|
1381 | 2da776db | Michael R. Hines | ibv_ack_cq_events(cq, num_cq_events); |
1382 | 2da776db | Michael R. Hines | } |
1383 | 2da776db | Michael R. Hines | return 0; |
1384 | 2da776db | Michael R. Hines | |
1385 | 2da776db | Michael R. Hines | err_block_for_wrid:
|
1386 | 2da776db | Michael R. Hines | if (num_cq_events) {
|
1387 | 2da776db | Michael R. Hines | ibv_ack_cq_events(cq, num_cq_events); |
1388 | 2da776db | Michael R. Hines | } |
1389 | 2da776db | Michael R. Hines | return ret;
|
1390 | 2da776db | Michael R. Hines | } |
1391 | 2da776db | Michael R. Hines | |
1392 | 2da776db | Michael R. Hines | /*
|
1393 | 2da776db | Michael R. Hines | * Post a SEND message work request for the control channel
|
1394 | 2da776db | Michael R. Hines | * containing some data and block until the post completes.
|
1395 | 2da776db | Michael R. Hines | */
|
1396 | 2da776db | Michael R. Hines | static int qemu_rdma_post_send_control(RDMAContext *rdma, uint8_t *buf, |
1397 | 2da776db | Michael R. Hines | RDMAControlHeader *head) |
1398 | 2da776db | Michael R. Hines | { |
1399 | 2da776db | Michael R. Hines | int ret = 0; |
1400 | 2da776db | Michael R. Hines | RDMAWorkRequestData *wr = &rdma->wr_data[RDMA_WRID_MAX]; |
1401 | 2da776db | Michael R. Hines | struct ibv_send_wr *bad_wr;
|
1402 | 2da776db | Michael R. Hines | struct ibv_sge sge = {
|
1403 | 2da776db | Michael R. Hines | .addr = (uint64_t)(wr->control), |
1404 | 2da776db | Michael R. Hines | .length = head->len + sizeof(RDMAControlHeader),
|
1405 | 2da776db | Michael R. Hines | .lkey = wr->control_mr->lkey, |
1406 | 2da776db | Michael R. Hines | }; |
1407 | 2da776db | Michael R. Hines | struct ibv_send_wr send_wr = {
|
1408 | 2da776db | Michael R. Hines | .wr_id = RDMA_WRID_SEND_CONTROL, |
1409 | 2da776db | Michael R. Hines | .opcode = IBV_WR_SEND, |
1410 | 2da776db | Michael R. Hines | .send_flags = IBV_SEND_SIGNALED, |
1411 | 2da776db | Michael R. Hines | .sg_list = &sge, |
1412 | 2da776db | Michael R. Hines | .num_sge = 1,
|
1413 | 2da776db | Michael R. Hines | }; |
1414 | 2da776db | Michael R. Hines | |
1415 | 2da776db | Michael R. Hines | DDDPRINTF("CONTROL: sending %s..\n", control_desc[head->type]);
|
1416 | 2da776db | Michael R. Hines | |
1417 | 2da776db | Michael R. Hines | /*
|
1418 | 2da776db | Michael R. Hines | * We don't actually need to do a memcpy() in here if we used
|
1419 | 2da776db | Michael R. Hines | * the "sge" properly, but since we're only sending control messages
|
1420 | 2da776db | Michael R. Hines | * (not RAM in a performance-critical path), then its OK for now.
|
1421 | 2da776db | Michael R. Hines | *
|
1422 | 2da776db | Michael R. Hines | * The copy makes the RDMAControlHeader simpler to manipulate
|
1423 | 2da776db | Michael R. Hines | * for the time being.
|
1424 | 2da776db | Michael R. Hines | */
|
1425 | 2da776db | Michael R. Hines | memcpy(wr->control, head, sizeof(RDMAControlHeader));
|
1426 | 2da776db | Michael R. Hines | control_to_network((void *) wr->control);
|
1427 | 2da776db | Michael R. Hines | |
1428 | 2da776db | Michael R. Hines | if (buf) {
|
1429 | 2da776db | Michael R. Hines | memcpy(wr->control + sizeof(RDMAControlHeader), buf, head->len);
|
1430 | 2da776db | Michael R. Hines | } |
1431 | 2da776db | Michael R. Hines | |
1432 | 2da776db | Michael R. Hines | |
1433 | 2da776db | Michael R. Hines | if (ibv_post_send(rdma->qp, &send_wr, &bad_wr)) {
|
1434 | 2da776db | Michael R. Hines | return -1; |
1435 | 2da776db | Michael R. Hines | } |
1436 | 2da776db | Michael R. Hines | |
1437 | 2da776db | Michael R. Hines | if (ret < 0) { |
1438 | 2da776db | Michael R. Hines | fprintf(stderr, "Failed to use post IB SEND for control!\n");
|
1439 | 2da776db | Michael R. Hines | return ret;
|
1440 | 2da776db | Michael R. Hines | } |
1441 | 2da776db | Michael R. Hines | |
1442 | 2da776db | Michael R. Hines | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_SEND_CONTROL); |
1443 | 2da776db | Michael R. Hines | if (ret < 0) { |
1444 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: send polling control error!\n");
|
1445 | 2da776db | Michael R. Hines | } |
1446 | 2da776db | Michael R. Hines | |
1447 | 2da776db | Michael R. Hines | return ret;
|
1448 | 2da776db | Michael R. Hines | } |
1449 | 2da776db | Michael R. Hines | |
1450 | 2da776db | Michael R. Hines | /*
|
1451 | 2da776db | Michael R. Hines | * Post a RECV work request in anticipation of some future receipt
|
1452 | 2da776db | Michael R. Hines | * of data on the control channel.
|
1453 | 2da776db | Michael R. Hines | */
|
1454 | 2da776db | Michael R. Hines | static int qemu_rdma_post_recv_control(RDMAContext *rdma, int idx) |
1455 | 2da776db | Michael R. Hines | { |
1456 | 2da776db | Michael R. Hines | struct ibv_recv_wr *bad_wr;
|
1457 | 2da776db | Michael R. Hines | struct ibv_sge sge = {
|
1458 | 2da776db | Michael R. Hines | .addr = (uint64_t)(rdma->wr_data[idx].control), |
1459 | 2da776db | Michael R. Hines | .length = RDMA_CONTROL_MAX_BUFFER, |
1460 | 2da776db | Michael R. Hines | .lkey = rdma->wr_data[idx].control_mr->lkey, |
1461 | 2da776db | Michael R. Hines | }; |
1462 | 2da776db | Michael R. Hines | |
1463 | 2da776db | Michael R. Hines | struct ibv_recv_wr recv_wr = {
|
1464 | 2da776db | Michael R. Hines | .wr_id = RDMA_WRID_RECV_CONTROL + idx, |
1465 | 2da776db | Michael R. Hines | .sg_list = &sge, |
1466 | 2da776db | Michael R. Hines | .num_sge = 1,
|
1467 | 2da776db | Michael R. Hines | }; |
1468 | 2da776db | Michael R. Hines | |
1469 | 2da776db | Michael R. Hines | |
1470 | 2da776db | Michael R. Hines | if (ibv_post_recv(rdma->qp, &recv_wr, &bad_wr)) {
|
1471 | 2da776db | Michael R. Hines | return -1; |
1472 | 2da776db | Michael R. Hines | } |
1473 | 2da776db | Michael R. Hines | |
1474 | 2da776db | Michael R. Hines | return 0; |
1475 | 2da776db | Michael R. Hines | } |
1476 | 2da776db | Michael R. Hines | |
1477 | 2da776db | Michael R. Hines | /*
|
1478 | 2da776db | Michael R. Hines | * Block and wait for a RECV control channel message to arrive.
|
1479 | 2da776db | Michael R. Hines | */
|
1480 | 2da776db | Michael R. Hines | static int qemu_rdma_exchange_get_response(RDMAContext *rdma, |
1481 | 2da776db | Michael R. Hines | RDMAControlHeader *head, int expecting, int idx) |
1482 | 2da776db | Michael R. Hines | { |
1483 | 2da776db | Michael R. Hines | int ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RECV_CONTROL + idx);
|
1484 | 2da776db | Michael R. Hines | |
1485 | 2da776db | Michael R. Hines | if (ret < 0) { |
1486 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: recv polling control error!\n");
|
1487 | 2da776db | Michael R. Hines | return ret;
|
1488 | 2da776db | Michael R. Hines | } |
1489 | 2da776db | Michael R. Hines | |
1490 | 2da776db | Michael R. Hines | network_to_control((void *) rdma->wr_data[idx].control);
|
1491 | 2da776db | Michael R. Hines | memcpy(head, rdma->wr_data[idx].control, sizeof(RDMAControlHeader));
|
1492 | 2da776db | Michael R. Hines | |
1493 | 2da776db | Michael R. Hines | DDDPRINTF("CONTROL: %s receiving...\n", control_desc[expecting]);
|
1494 | 2da776db | Michael R. Hines | |
1495 | 2da776db | Michael R. Hines | if (expecting == RDMA_CONTROL_NONE) {
|
1496 | 2da776db | Michael R. Hines | DDDPRINTF("Surprise: got %s (%d)\n",
|
1497 | 2da776db | Michael R. Hines | control_desc[head->type], head->type); |
1498 | 2da776db | Michael R. Hines | } else if (head->type != expecting || head->type == RDMA_CONTROL_ERROR) { |
1499 | 2da776db | Michael R. Hines | fprintf(stderr, "Was expecting a %s (%d) control message"
|
1500 | 2da776db | Michael R. Hines | ", but got: %s (%d), length: %d\n",
|
1501 | 2da776db | Michael R. Hines | control_desc[expecting], expecting, |
1502 | 2da776db | Michael R. Hines | control_desc[head->type], head->type, head->len); |
1503 | 2da776db | Michael R. Hines | return -EIO;
|
1504 | 2da776db | Michael R. Hines | } |
1505 | 2da776db | Michael R. Hines | |
1506 | 2da776db | Michael R. Hines | return 0; |
1507 | 2da776db | Michael R. Hines | } |
1508 | 2da776db | Michael R. Hines | |
1509 | 2da776db | Michael R. Hines | /*
|
1510 | 2da776db | Michael R. Hines | * When a RECV work request has completed, the work request's
|
1511 | 2da776db | Michael R. Hines | * buffer is pointed at the header.
|
1512 | 2da776db | Michael R. Hines | *
|
1513 | 2da776db | Michael R. Hines | * This will advance the pointer to the data portion
|
1514 | 2da776db | Michael R. Hines | * of the control message of the work request's buffer that
|
1515 | 2da776db | Michael R. Hines | * was populated after the work request finished.
|
1516 | 2da776db | Michael R. Hines | */
|
1517 | 2da776db | Michael R. Hines | static void qemu_rdma_move_header(RDMAContext *rdma, int idx, |
1518 | 2da776db | Michael R. Hines | RDMAControlHeader *head) |
1519 | 2da776db | Michael R. Hines | { |
1520 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control_len = head->len; |
1521 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control_curr = |
1522 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control + sizeof(RDMAControlHeader);
|
1523 | 2da776db | Michael R. Hines | } |
1524 | 2da776db | Michael R. Hines | |
1525 | 2da776db | Michael R. Hines | /*
|
1526 | 2da776db | Michael R. Hines | * This is an 'atomic' high-level operation to deliver a single, unified
|
1527 | 2da776db | Michael R. Hines | * control-channel message.
|
1528 | 2da776db | Michael R. Hines | *
|
1529 | 2da776db | Michael R. Hines | * Additionally, if the user is expecting some kind of reply to this message,
|
1530 | 2da776db | Michael R. Hines | * they can request a 'resp' response message be filled in by posting an
|
1531 | 2da776db | Michael R. Hines | * additional work request on behalf of the user and waiting for an additional
|
1532 | 2da776db | Michael R. Hines | * completion.
|
1533 | 2da776db | Michael R. Hines | *
|
1534 | 2da776db | Michael R. Hines | * The extra (optional) response is used during registration to us from having
|
1535 | 2da776db | Michael R. Hines | * to perform an *additional* exchange of message just to provide a response by
|
1536 | 2da776db | Michael R. Hines | * instead piggy-backing on the acknowledgement.
|
1537 | 2da776db | Michael R. Hines | */
|
1538 | 2da776db | Michael R. Hines | static int qemu_rdma_exchange_send(RDMAContext *rdma, RDMAControlHeader *head, |
1539 | 2da776db | Michael R. Hines | uint8_t *data, RDMAControlHeader *resp, |
1540 | 2da776db | Michael R. Hines | int *resp_idx,
|
1541 | 2da776db | Michael R. Hines | int (*callback)(RDMAContext *rdma))
|
1542 | 2da776db | Michael R. Hines | { |
1543 | 2da776db | Michael R. Hines | int ret = 0; |
1544 | 2da776db | Michael R. Hines | |
1545 | 2da776db | Michael R. Hines | /*
|
1546 | 2da776db | Michael R. Hines | * Wait until the dest is ready before attempting to deliver the message
|
1547 | 2da776db | Michael R. Hines | * by waiting for a READY message.
|
1548 | 2da776db | Michael R. Hines | */
|
1549 | 2da776db | Michael R. Hines | if (rdma->control_ready_expected) {
|
1550 | 2da776db | Michael R. Hines | RDMAControlHeader resp; |
1551 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_get_response(rdma, |
1552 | 2da776db | Michael R. Hines | &resp, RDMA_CONTROL_READY, RDMA_WRID_READY); |
1553 | 2da776db | Michael R. Hines | if (ret < 0) { |
1554 | 2da776db | Michael R. Hines | return ret;
|
1555 | 2da776db | Michael R. Hines | } |
1556 | 2da776db | Michael R. Hines | } |
1557 | 2da776db | Michael R. Hines | |
1558 | 2da776db | Michael R. Hines | /*
|
1559 | 2da776db | Michael R. Hines | * If the user is expecting a response, post a WR in anticipation of it.
|
1560 | 2da776db | Michael R. Hines | */
|
1561 | 2da776db | Michael R. Hines | if (resp) {
|
1562 | 2da776db | Michael R. Hines | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_DATA); |
1563 | 2da776db | Michael R. Hines | if (ret) {
|
1564 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: error posting"
|
1565 | 2da776db | Michael R. Hines | " extra control recv for anticipated result!");
|
1566 | 2da776db | Michael R. Hines | return ret;
|
1567 | 2da776db | Michael R. Hines | } |
1568 | 2da776db | Michael R. Hines | } |
1569 | 2da776db | Michael R. Hines | |
1570 | 2da776db | Michael R. Hines | /*
|
1571 | 2da776db | Michael R. Hines | * Post a WR to replace the one we just consumed for the READY message.
|
1572 | 2da776db | Michael R. Hines | */
|
1573 | 2da776db | Michael R. Hines | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY); |
1574 | 2da776db | Michael R. Hines | if (ret) {
|
1575 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: error posting first control recv!");
|
1576 | 2da776db | Michael R. Hines | return ret;
|
1577 | 2da776db | Michael R. Hines | } |
1578 | 2da776db | Michael R. Hines | |
1579 | 2da776db | Michael R. Hines | /*
|
1580 | 2da776db | Michael R. Hines | * Deliver the control message that was requested.
|
1581 | 2da776db | Michael R. Hines | */
|
1582 | 2da776db | Michael R. Hines | ret = qemu_rdma_post_send_control(rdma, data, head); |
1583 | 2da776db | Michael R. Hines | |
1584 | 2da776db | Michael R. Hines | if (ret < 0) { |
1585 | 2da776db | Michael R. Hines | fprintf(stderr, "Failed to send control buffer!\n");
|
1586 | 2da776db | Michael R. Hines | return ret;
|
1587 | 2da776db | Michael R. Hines | } |
1588 | 2da776db | Michael R. Hines | |
1589 | 2da776db | Michael R. Hines | /*
|
1590 | 2da776db | Michael R. Hines | * If we're expecting a response, block and wait for it.
|
1591 | 2da776db | Michael R. Hines | */
|
1592 | 2da776db | Michael R. Hines | if (resp) {
|
1593 | 2da776db | Michael R. Hines | if (callback) {
|
1594 | 2da776db | Michael R. Hines | DDPRINTF("Issuing callback before receiving response...\n");
|
1595 | 2da776db | Michael R. Hines | ret = callback(rdma); |
1596 | 2da776db | Michael R. Hines | if (ret < 0) { |
1597 | 2da776db | Michael R. Hines | return ret;
|
1598 | 2da776db | Michael R. Hines | } |
1599 | 2da776db | Michael R. Hines | } |
1600 | 2da776db | Michael R. Hines | |
1601 | 2da776db | Michael R. Hines | DDPRINTF("Waiting for response %s\n", control_desc[resp->type]);
|
1602 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_get_response(rdma, resp, |
1603 | 2da776db | Michael R. Hines | resp->type, RDMA_WRID_DATA); |
1604 | 2da776db | Michael R. Hines | |
1605 | 2da776db | Michael R. Hines | if (ret < 0) { |
1606 | 2da776db | Michael R. Hines | return ret;
|
1607 | 2da776db | Michael R. Hines | } |
1608 | 2da776db | Michael R. Hines | |
1609 | 2da776db | Michael R. Hines | qemu_rdma_move_header(rdma, RDMA_WRID_DATA, resp); |
1610 | 2da776db | Michael R. Hines | if (resp_idx) {
|
1611 | 2da776db | Michael R. Hines | *resp_idx = RDMA_WRID_DATA; |
1612 | 2da776db | Michael R. Hines | } |
1613 | 2da776db | Michael R. Hines | DDPRINTF("Response %s received.\n", control_desc[resp->type]);
|
1614 | 2da776db | Michael R. Hines | } |
1615 | 2da776db | Michael R. Hines | |
1616 | 2da776db | Michael R. Hines | rdma->control_ready_expected = 1;
|
1617 | 2da776db | Michael R. Hines | |
1618 | 2da776db | Michael R. Hines | return 0; |
1619 | 2da776db | Michael R. Hines | } |
1620 | 2da776db | Michael R. Hines | |
1621 | 2da776db | Michael R. Hines | /*
|
1622 | 2da776db | Michael R. Hines | * This is an 'atomic' high-level operation to receive a single, unified
|
1623 | 2da776db | Michael R. Hines | * control-channel message.
|
1624 | 2da776db | Michael R. Hines | */
|
1625 | 2da776db | Michael R. Hines | static int qemu_rdma_exchange_recv(RDMAContext *rdma, RDMAControlHeader *head, |
1626 | 2da776db | Michael R. Hines | int expecting)
|
1627 | 2da776db | Michael R. Hines | { |
1628 | 2da776db | Michael R. Hines | RDMAControlHeader ready = { |
1629 | 2da776db | Michael R. Hines | .len = 0,
|
1630 | 2da776db | Michael R. Hines | .type = RDMA_CONTROL_READY, |
1631 | 2da776db | Michael R. Hines | .repeat = 1,
|
1632 | 2da776db | Michael R. Hines | }; |
1633 | 2da776db | Michael R. Hines | int ret;
|
1634 | 2da776db | Michael R. Hines | |
1635 | 2da776db | Michael R. Hines | /*
|
1636 | 2da776db | Michael R. Hines | * Inform the source that we're ready to receive a message.
|
1637 | 2da776db | Michael R. Hines | */
|
1638 | 2da776db | Michael R. Hines | ret = qemu_rdma_post_send_control(rdma, NULL, &ready);
|
1639 | 2da776db | Michael R. Hines | |
1640 | 2da776db | Michael R. Hines | if (ret < 0) { |
1641 | 2da776db | Michael R. Hines | fprintf(stderr, "Failed to send control buffer!\n");
|
1642 | 2da776db | Michael R. Hines | return ret;
|
1643 | 2da776db | Michael R. Hines | } |
1644 | 2da776db | Michael R. Hines | |
1645 | 2da776db | Michael R. Hines | /*
|
1646 | 2da776db | Michael R. Hines | * Block and wait for the message.
|
1647 | 2da776db | Michael R. Hines | */
|
1648 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_get_response(rdma, head, |
1649 | 2da776db | Michael R. Hines | expecting, RDMA_WRID_READY); |
1650 | 2da776db | Michael R. Hines | |
1651 | 2da776db | Michael R. Hines | if (ret < 0) { |
1652 | 2da776db | Michael R. Hines | return ret;
|
1653 | 2da776db | Michael R. Hines | } |
1654 | 2da776db | Michael R. Hines | |
1655 | 2da776db | Michael R. Hines | qemu_rdma_move_header(rdma, RDMA_WRID_READY, head); |
1656 | 2da776db | Michael R. Hines | |
1657 | 2da776db | Michael R. Hines | /*
|
1658 | 2da776db | Michael R. Hines | * Post a new RECV work request to replace the one we just consumed.
|
1659 | 2da776db | Michael R. Hines | */
|
1660 | 2da776db | Michael R. Hines | ret = qemu_rdma_post_recv_control(rdma, RDMA_WRID_READY); |
1661 | 2da776db | Michael R. Hines | if (ret) {
|
1662 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: error posting second control recv!");
|
1663 | 2da776db | Michael R. Hines | return ret;
|
1664 | 2da776db | Michael R. Hines | } |
1665 | 2da776db | Michael R. Hines | |
1666 | 2da776db | Michael R. Hines | return 0; |
1667 | 2da776db | Michael R. Hines | } |
1668 | 2da776db | Michael R. Hines | |
1669 | 2da776db | Michael R. Hines | /*
|
1670 | 2da776db | Michael R. Hines | * Write an actual chunk of memory using RDMA.
|
1671 | 2da776db | Michael R. Hines | *
|
1672 | 2da776db | Michael R. Hines | * If we're using dynamic registration on the dest-side, we have to
|
1673 | 2da776db | Michael R. Hines | * send a registration command first.
|
1674 | 2da776db | Michael R. Hines | */
|
1675 | 2da776db | Michael R. Hines | static int qemu_rdma_write_one(QEMUFile *f, RDMAContext *rdma, |
1676 | 2da776db | Michael R. Hines | int current_index, uint64_t current_addr,
|
1677 | 2da776db | Michael R. Hines | uint64_t length) |
1678 | 2da776db | Michael R. Hines | { |
1679 | 2da776db | Michael R. Hines | struct ibv_sge sge;
|
1680 | 2da776db | Michael R. Hines | struct ibv_send_wr send_wr = { 0 }; |
1681 | 2da776db | Michael R. Hines | struct ibv_send_wr *bad_wr;
|
1682 | 2da776db | Michael R. Hines | int reg_result_idx, ret, count = 0; |
1683 | 2da776db | Michael R. Hines | uint64_t chunk, chunks; |
1684 | 2da776db | Michael R. Hines | uint8_t *chunk_start, *chunk_end; |
1685 | 2da776db | Michael R. Hines | RDMALocalBlock *block = &(rdma->local_ram_blocks.block[current_index]); |
1686 | 2da776db | Michael R. Hines | RDMARegister reg; |
1687 | 2da776db | Michael R. Hines | RDMARegisterResult *reg_result; |
1688 | 2da776db | Michael R. Hines | RDMAControlHeader resp = { .type = RDMA_CONTROL_REGISTER_RESULT }; |
1689 | 2da776db | Michael R. Hines | RDMAControlHeader head = { .len = sizeof(RDMARegister),
|
1690 | 2da776db | Michael R. Hines | .type = RDMA_CONTROL_REGISTER_REQUEST, |
1691 | 2da776db | Michael R. Hines | .repeat = 1,
|
1692 | 2da776db | Michael R. Hines | }; |
1693 | 2da776db | Michael R. Hines | |
1694 | 2da776db | Michael R. Hines | retry:
|
1695 | 2da776db | Michael R. Hines | sge.addr = (uint64_t)(block->local_host_addr + |
1696 | 2da776db | Michael R. Hines | (current_addr - block->offset)); |
1697 | 2da776db | Michael R. Hines | sge.length = length; |
1698 | 2da776db | Michael R. Hines | |
1699 | 2da776db | Michael R. Hines | chunk = ram_chunk_index(block->local_host_addr, (uint8_t *) sge.addr); |
1700 | 2da776db | Michael R. Hines | chunk_start = ram_chunk_start(block, chunk); |
1701 | 2da776db | Michael R. Hines | |
1702 | 2da776db | Michael R. Hines | if (block->is_ram_block) {
|
1703 | 2da776db | Michael R. Hines | chunks = length / (1UL << RDMA_REG_CHUNK_SHIFT);
|
1704 | 2da776db | Michael R. Hines | |
1705 | 2da776db | Michael R. Hines | if (chunks && ((length % (1UL << RDMA_REG_CHUNK_SHIFT)) == 0)) { |
1706 | 2da776db | Michael R. Hines | chunks--; |
1707 | 2da776db | Michael R. Hines | } |
1708 | 2da776db | Michael R. Hines | } else {
|
1709 | 2da776db | Michael R. Hines | chunks = block->length / (1UL << RDMA_REG_CHUNK_SHIFT);
|
1710 | 2da776db | Michael R. Hines | |
1711 | 2da776db | Michael R. Hines | if (chunks && ((block->length % (1UL << RDMA_REG_CHUNK_SHIFT)) == 0)) { |
1712 | 2da776db | Michael R. Hines | chunks--; |
1713 | 2da776db | Michael R. Hines | } |
1714 | 2da776db | Michael R. Hines | } |
1715 | 2da776db | Michael R. Hines | |
1716 | 2da776db | Michael R. Hines | DDPRINTF("Writing %" PRIu64 " chunks, (%" PRIu64 " MB)\n", |
1717 | 2da776db | Michael R. Hines | chunks + 1, (chunks + 1) * (1UL << RDMA_REG_CHUNK_SHIFT) / 1024 / 1024); |
1718 | 2da776db | Michael R. Hines | |
1719 | 2da776db | Michael R. Hines | chunk_end = ram_chunk_end(block, chunk + chunks); |
1720 | 2da776db | Michael R. Hines | |
1721 | 2da776db | Michael R. Hines | if (!rdma->pin_all) {
|
1722 | 2da776db | Michael R. Hines | #ifdef RDMA_UNREGISTRATION_EXAMPLE
|
1723 | 2da776db | Michael R. Hines | qemu_rdma_unregister_waiting(rdma); |
1724 | 2da776db | Michael R. Hines | #endif
|
1725 | 2da776db | Michael R. Hines | } |
1726 | 2da776db | Michael R. Hines | |
1727 | 2da776db | Michael R. Hines | while (test_bit(chunk, block->transit_bitmap)) {
|
1728 | 2da776db | Michael R. Hines | (void)count;
|
1729 | 2da776db | Michael R. Hines | DDPRINTF("(%d) Not clobbering: block: %d chunk %" PRIu64
|
1730 | 2da776db | Michael R. Hines | " current %" PRIu64 " len %" PRIu64 " %d %d\n", |
1731 | 2da776db | Michael R. Hines | count++, current_index, chunk, |
1732 | 2da776db | Michael R. Hines | sge.addr, length, rdma->nb_sent, block->nb_chunks); |
1733 | 2da776db | Michael R. Hines | |
1734 | 2da776db | Michael R. Hines | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE); |
1735 | 2da776db | Michael R. Hines | |
1736 | 2da776db | Michael R. Hines | if (ret < 0) { |
1737 | 2da776db | Michael R. Hines | fprintf(stderr, "Failed to Wait for previous write to complete "
|
1738 | 2da776db | Michael R. Hines | "block %d chunk %" PRIu64
|
1739 | 2da776db | Michael R. Hines | " current %" PRIu64 " len %" PRIu64 " %d\n", |
1740 | 2da776db | Michael R. Hines | current_index, chunk, sge.addr, length, rdma->nb_sent); |
1741 | 2da776db | Michael R. Hines | return ret;
|
1742 | 2da776db | Michael R. Hines | } |
1743 | 2da776db | Michael R. Hines | } |
1744 | 2da776db | Michael R. Hines | |
1745 | 2da776db | Michael R. Hines | if (!rdma->pin_all || !block->is_ram_block) {
|
1746 | 2da776db | Michael R. Hines | if (!block->remote_keys[chunk]) {
|
1747 | 2da776db | Michael R. Hines | /*
|
1748 | 2da776db | Michael R. Hines | * This chunk has not yet been registered, so first check to see
|
1749 | 2da776db | Michael R. Hines | * if the entire chunk is zero. If so, tell the other size to
|
1750 | 2da776db | Michael R. Hines | * memset() + madvise() the entire chunk without RDMA.
|
1751 | 2da776db | Michael R. Hines | */
|
1752 | 2da776db | Michael R. Hines | |
1753 | 2da776db | Michael R. Hines | if (can_use_buffer_find_nonzero_offset((void *)sge.addr, length) |
1754 | 2da776db | Michael R. Hines | && buffer_find_nonzero_offset((void *)sge.addr,
|
1755 | 2da776db | Michael R. Hines | length) == length) { |
1756 | 2da776db | Michael R. Hines | RDMACompress comp = { |
1757 | 2da776db | Michael R. Hines | .offset = current_addr, |
1758 | 2da776db | Michael R. Hines | .value = 0,
|
1759 | 2da776db | Michael R. Hines | .block_idx = current_index, |
1760 | 2da776db | Michael R. Hines | .length = length, |
1761 | 2da776db | Michael R. Hines | }; |
1762 | 2da776db | Michael R. Hines | |
1763 | 2da776db | Michael R. Hines | head.len = sizeof(comp);
|
1764 | 2da776db | Michael R. Hines | head.type = RDMA_CONTROL_COMPRESS; |
1765 | 2da776db | Michael R. Hines | |
1766 | 2da776db | Michael R. Hines | DDPRINTF("Entire chunk is zero, sending compress: %"
|
1767 | 2da776db | Michael R. Hines | PRIu64 " for %d "
|
1768 | 2da776db | Michael R. Hines | "bytes, index: %d, offset: %" PRId64 "...\n", |
1769 | 2da776db | Michael R. Hines | chunk, sge.length, current_index, current_addr); |
1770 | 2da776db | Michael R. Hines | |
1771 | 2da776db | Michael R. Hines | compress_to_network(&comp); |
1772 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_send(rdma, &head, |
1773 | 2da776db | Michael R. Hines | (uint8_t *) &comp, NULL, NULL, NULL); |
1774 | 2da776db | Michael R. Hines | |
1775 | 2da776db | Michael R. Hines | if (ret < 0) { |
1776 | 2da776db | Michael R. Hines | return -EIO;
|
1777 | 2da776db | Michael R. Hines | } |
1778 | 2da776db | Michael R. Hines | |
1779 | 2da776db | Michael R. Hines | acct_update_position(f, sge.length, true);
|
1780 | 2da776db | Michael R. Hines | |
1781 | 2da776db | Michael R. Hines | return 1; |
1782 | 2da776db | Michael R. Hines | } |
1783 | 2da776db | Michael R. Hines | |
1784 | 2da776db | Michael R. Hines | /*
|
1785 | 2da776db | Michael R. Hines | * Otherwise, tell other side to register.
|
1786 | 2da776db | Michael R. Hines | */
|
1787 | 2da776db | Michael R. Hines | reg.current_index = current_index; |
1788 | 2da776db | Michael R. Hines | if (block->is_ram_block) {
|
1789 | 2da776db | Michael R. Hines | reg.key.current_addr = current_addr; |
1790 | 2da776db | Michael R. Hines | } else {
|
1791 | 2da776db | Michael R. Hines | reg.key.chunk = chunk; |
1792 | 2da776db | Michael R. Hines | } |
1793 | 2da776db | Michael R. Hines | reg.chunks = chunks; |
1794 | 2da776db | Michael R. Hines | |
1795 | 2da776db | Michael R. Hines | DDPRINTF("Sending registration request chunk %" PRIu64 " for %d " |
1796 | 2da776db | Michael R. Hines | "bytes, index: %d, offset: %" PRId64 "...\n", |
1797 | 2da776db | Michael R. Hines | chunk, sge.length, current_index, current_addr); |
1798 | 2da776db | Michael R. Hines | |
1799 | 2da776db | Michael R. Hines | register_to_network(®); |
1800 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_send(rdma, &head, (uint8_t *) ®, |
1801 | 2da776db | Michael R. Hines | &resp, ®_result_idx, NULL);
|
1802 | 2da776db | Michael R. Hines | if (ret < 0) { |
1803 | 2da776db | Michael R. Hines | return ret;
|
1804 | 2da776db | Michael R. Hines | } |
1805 | 2da776db | Michael R. Hines | |
1806 | 2da776db | Michael R. Hines | /* try to overlap this single registration with the one we sent. */
|
1807 | 2da776db | Michael R. Hines | if (qemu_rdma_register_and_get_keys(rdma, block,
|
1808 | 2da776db | Michael R. Hines | (uint8_t *) sge.addr, |
1809 | 2da776db | Michael R. Hines | &sge.lkey, NULL, chunk,
|
1810 | 2da776db | Michael R. Hines | chunk_start, chunk_end)) { |
1811 | 2da776db | Michael R. Hines | fprintf(stderr, "cannot get lkey!\n");
|
1812 | 2da776db | Michael R. Hines | return -EINVAL;
|
1813 | 2da776db | Michael R. Hines | } |
1814 | 2da776db | Michael R. Hines | |
1815 | 2da776db | Michael R. Hines | reg_result = (RDMARegisterResult *) |
1816 | 2da776db | Michael R. Hines | rdma->wr_data[reg_result_idx].control_curr; |
1817 | 2da776db | Michael R. Hines | |
1818 | 2da776db | Michael R. Hines | network_to_result(reg_result); |
1819 | 2da776db | Michael R. Hines | |
1820 | 2da776db | Michael R. Hines | DDPRINTF("Received registration result:"
|
1821 | 2da776db | Michael R. Hines | " my key: %x their key %x, chunk %" PRIu64 "\n", |
1822 | 2da776db | Michael R. Hines | block->remote_keys[chunk], reg_result->rkey, chunk); |
1823 | 2da776db | Michael R. Hines | |
1824 | 2da776db | Michael R. Hines | block->remote_keys[chunk] = reg_result->rkey; |
1825 | 2da776db | Michael R. Hines | block->remote_host_addr = reg_result->host_addr; |
1826 | 2da776db | Michael R. Hines | } else {
|
1827 | 2da776db | Michael R. Hines | /* already registered before */
|
1828 | 2da776db | Michael R. Hines | if (qemu_rdma_register_and_get_keys(rdma, block,
|
1829 | 2da776db | Michael R. Hines | (uint8_t *)sge.addr, |
1830 | 2da776db | Michael R. Hines | &sge.lkey, NULL, chunk,
|
1831 | 2da776db | Michael R. Hines | chunk_start, chunk_end)) { |
1832 | 2da776db | Michael R. Hines | fprintf(stderr, "cannot get lkey!\n");
|
1833 | 2da776db | Michael R. Hines | return -EINVAL;
|
1834 | 2da776db | Michael R. Hines | } |
1835 | 2da776db | Michael R. Hines | } |
1836 | 2da776db | Michael R. Hines | |
1837 | 2da776db | Michael R. Hines | send_wr.wr.rdma.rkey = block->remote_keys[chunk]; |
1838 | 2da776db | Michael R. Hines | } else {
|
1839 | 2da776db | Michael R. Hines | send_wr.wr.rdma.rkey = block->remote_rkey; |
1840 | 2da776db | Michael R. Hines | |
1841 | 2da776db | Michael R. Hines | if (qemu_rdma_register_and_get_keys(rdma, block, (uint8_t *)sge.addr,
|
1842 | 2da776db | Michael R. Hines | &sge.lkey, NULL, chunk,
|
1843 | 2da776db | Michael R. Hines | chunk_start, chunk_end)) { |
1844 | 2da776db | Michael R. Hines | fprintf(stderr, "cannot get lkey!\n");
|
1845 | 2da776db | Michael R. Hines | return -EINVAL;
|
1846 | 2da776db | Michael R. Hines | } |
1847 | 2da776db | Michael R. Hines | } |
1848 | 2da776db | Michael R. Hines | |
1849 | 2da776db | Michael R. Hines | /*
|
1850 | 2da776db | Michael R. Hines | * Encode the ram block index and chunk within this wrid.
|
1851 | 2da776db | Michael R. Hines | * We will use this information at the time of completion
|
1852 | 2da776db | Michael R. Hines | * to figure out which bitmap to check against and then which
|
1853 | 2da776db | Michael R. Hines | * chunk in the bitmap to look for.
|
1854 | 2da776db | Michael R. Hines | */
|
1855 | 2da776db | Michael R. Hines | send_wr.wr_id = qemu_rdma_make_wrid(RDMA_WRID_RDMA_WRITE, |
1856 | 2da776db | Michael R. Hines | current_index, chunk); |
1857 | 2da776db | Michael R. Hines | |
1858 | 2da776db | Michael R. Hines | send_wr.opcode = IBV_WR_RDMA_WRITE; |
1859 | 2da776db | Michael R. Hines | send_wr.send_flags = IBV_SEND_SIGNALED; |
1860 | 2da776db | Michael R. Hines | send_wr.sg_list = &sge; |
1861 | 2da776db | Michael R. Hines | send_wr.num_sge = 1;
|
1862 | 2da776db | Michael R. Hines | send_wr.wr.rdma.remote_addr = block->remote_host_addr + |
1863 | 2da776db | Michael R. Hines | (current_addr - block->offset); |
1864 | 2da776db | Michael R. Hines | |
1865 | 2da776db | Michael R. Hines | DDDPRINTF("Posting chunk: %" PRIu64 ", addr: %lx" |
1866 | 2da776db | Michael R. Hines | " remote: %lx, bytes %" PRIu32 "\n", |
1867 | 2da776db | Michael R. Hines | chunk, sge.addr, send_wr.wr.rdma.remote_addr, |
1868 | 2da776db | Michael R. Hines | sge.length); |
1869 | 2da776db | Michael R. Hines | |
1870 | 2da776db | Michael R. Hines | /*
|
1871 | 2da776db | Michael R. Hines | * ibv_post_send() does not return negative error numbers,
|
1872 | 2da776db | Michael R. Hines | * per the specification they are positive - no idea why.
|
1873 | 2da776db | Michael R. Hines | */
|
1874 | 2da776db | Michael R. Hines | ret = ibv_post_send(rdma->qp, &send_wr, &bad_wr); |
1875 | 2da776db | Michael R. Hines | |
1876 | 2da776db | Michael R. Hines | if (ret == ENOMEM) {
|
1877 | 2da776db | Michael R. Hines | DDPRINTF("send queue is full. wait a little....\n");
|
1878 | 2da776db | Michael R. Hines | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE); |
1879 | 2da776db | Michael R. Hines | if (ret < 0) { |
1880 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: failed to make "
|
1881 | 2da776db | Michael R. Hines | "room in full send queue! %d\n", ret);
|
1882 | 2da776db | Michael R. Hines | return ret;
|
1883 | 2da776db | Michael R. Hines | } |
1884 | 2da776db | Michael R. Hines | |
1885 | 2da776db | Michael R. Hines | goto retry;
|
1886 | 2da776db | Michael R. Hines | |
1887 | 2da776db | Michael R. Hines | } else if (ret > 0) { |
1888 | 2da776db | Michael R. Hines | perror("rdma migration: post rdma write failed");
|
1889 | 2da776db | Michael R. Hines | return -ret;
|
1890 | 2da776db | Michael R. Hines | } |
1891 | 2da776db | Michael R. Hines | |
1892 | 2da776db | Michael R. Hines | set_bit(chunk, block->transit_bitmap); |
1893 | 2da776db | Michael R. Hines | acct_update_position(f, sge.length, false);
|
1894 | 2da776db | Michael R. Hines | rdma->total_writes++; |
1895 | 2da776db | Michael R. Hines | |
1896 | 2da776db | Michael R. Hines | return 0; |
1897 | 2da776db | Michael R. Hines | } |
1898 | 2da776db | Michael R. Hines | |
1899 | 2da776db | Michael R. Hines | /*
|
1900 | 2da776db | Michael R. Hines | * Push out any unwritten RDMA operations.
|
1901 | 2da776db | Michael R. Hines | *
|
1902 | 2da776db | Michael R. Hines | * We support sending out multiple chunks at the same time.
|
1903 | 2da776db | Michael R. Hines | * Not all of them need to get signaled in the completion queue.
|
1904 | 2da776db | Michael R. Hines | */
|
1905 | 2da776db | Michael R. Hines | static int qemu_rdma_write_flush(QEMUFile *f, RDMAContext *rdma) |
1906 | 2da776db | Michael R. Hines | { |
1907 | 2da776db | Michael R. Hines | int ret;
|
1908 | 2da776db | Michael R. Hines | |
1909 | 2da776db | Michael R. Hines | if (!rdma->current_length) {
|
1910 | 2da776db | Michael R. Hines | return 0; |
1911 | 2da776db | Michael R. Hines | } |
1912 | 2da776db | Michael R. Hines | |
1913 | 2da776db | Michael R. Hines | ret = qemu_rdma_write_one(f, rdma, |
1914 | 2da776db | Michael R. Hines | rdma->current_index, rdma->current_addr, rdma->current_length); |
1915 | 2da776db | Michael R. Hines | |
1916 | 2da776db | Michael R. Hines | if (ret < 0) { |
1917 | 2da776db | Michael R. Hines | return ret;
|
1918 | 2da776db | Michael R. Hines | } |
1919 | 2da776db | Michael R. Hines | |
1920 | 2da776db | Michael R. Hines | if (ret == 0) { |
1921 | 2da776db | Michael R. Hines | rdma->nb_sent++; |
1922 | 2da776db | Michael R. Hines | DDDPRINTF("sent total: %d\n", rdma->nb_sent);
|
1923 | 2da776db | Michael R. Hines | } |
1924 | 2da776db | Michael R. Hines | |
1925 | 2da776db | Michael R. Hines | rdma->current_length = 0;
|
1926 | 2da776db | Michael R. Hines | rdma->current_addr = 0;
|
1927 | 2da776db | Michael R. Hines | |
1928 | 2da776db | Michael R. Hines | return 0; |
1929 | 2da776db | Michael R. Hines | } |
1930 | 2da776db | Michael R. Hines | |
1931 | 2da776db | Michael R. Hines | static inline int qemu_rdma_buffer_mergable(RDMAContext *rdma, |
1932 | 2da776db | Michael R. Hines | uint64_t offset, uint64_t len) |
1933 | 2da776db | Michael R. Hines | { |
1934 | 2da776db | Michael R. Hines | RDMALocalBlock *block = |
1935 | 2da776db | Michael R. Hines | &(rdma->local_ram_blocks.block[rdma->current_index]); |
1936 | 2da776db | Michael R. Hines | uint8_t *host_addr = block->local_host_addr + (offset - block->offset); |
1937 | 2da776db | Michael R. Hines | uint8_t *chunk_end = ram_chunk_end(block, rdma->current_chunk); |
1938 | 2da776db | Michael R. Hines | |
1939 | 2da776db | Michael R. Hines | if (rdma->current_length == 0) { |
1940 | 2da776db | Michael R. Hines | return 0; |
1941 | 2da776db | Michael R. Hines | } |
1942 | 2da776db | Michael R. Hines | |
1943 | 2da776db | Michael R. Hines | /*
|
1944 | 2da776db | Michael R. Hines | * Only merge into chunk sequentially.
|
1945 | 2da776db | Michael R. Hines | */
|
1946 | 2da776db | Michael R. Hines | if (offset != (rdma->current_addr + rdma->current_length)) {
|
1947 | 2da776db | Michael R. Hines | return 0; |
1948 | 2da776db | Michael R. Hines | } |
1949 | 2da776db | Michael R. Hines | |
1950 | 2da776db | Michael R. Hines | if (rdma->current_index < 0) { |
1951 | 2da776db | Michael R. Hines | return 0; |
1952 | 2da776db | Michael R. Hines | } |
1953 | 2da776db | Michael R. Hines | |
1954 | 2da776db | Michael R. Hines | if (offset < block->offset) {
|
1955 | 2da776db | Michael R. Hines | return 0; |
1956 | 2da776db | Michael R. Hines | } |
1957 | 2da776db | Michael R. Hines | |
1958 | 2da776db | Michael R. Hines | if ((offset + len) > (block->offset + block->length)) {
|
1959 | 2da776db | Michael R. Hines | return 0; |
1960 | 2da776db | Michael R. Hines | } |
1961 | 2da776db | Michael R. Hines | |
1962 | 2da776db | Michael R. Hines | if (rdma->current_chunk < 0) { |
1963 | 2da776db | Michael R. Hines | return 0; |
1964 | 2da776db | Michael R. Hines | } |
1965 | 2da776db | Michael R. Hines | |
1966 | 2da776db | Michael R. Hines | if ((host_addr + len) > chunk_end) {
|
1967 | 2da776db | Michael R. Hines | return 0; |
1968 | 2da776db | Michael R. Hines | } |
1969 | 2da776db | Michael R. Hines | |
1970 | 2da776db | Michael R. Hines | return 1; |
1971 | 2da776db | Michael R. Hines | } |
1972 | 2da776db | Michael R. Hines | |
1973 | 2da776db | Michael R. Hines | /*
|
1974 | 2da776db | Michael R. Hines | * We're not actually writing here, but doing three things:
|
1975 | 2da776db | Michael R. Hines | *
|
1976 | 2da776db | Michael R. Hines | * 1. Identify the chunk the buffer belongs to.
|
1977 | 2da776db | Michael R. Hines | * 2. If the chunk is full or the buffer doesn't belong to the current
|
1978 | 2da776db | Michael R. Hines | * chunk, then start a new chunk and flush() the old chunk.
|
1979 | 2da776db | Michael R. Hines | * 3. To keep the hardware busy, we also group chunks into batches
|
1980 | 2da776db | Michael R. Hines | * and only require that a batch gets acknowledged in the completion
|
1981 | 2da776db | Michael R. Hines | * qeueue instead of each individual chunk.
|
1982 | 2da776db | Michael R. Hines | */
|
1983 | 2da776db | Michael R. Hines | static int qemu_rdma_write(QEMUFile *f, RDMAContext *rdma, |
1984 | 2da776db | Michael R. Hines | uint64_t block_offset, uint64_t offset, |
1985 | 2da776db | Michael R. Hines | uint64_t len) |
1986 | 2da776db | Michael R. Hines | { |
1987 | 2da776db | Michael R. Hines | uint64_t current_addr = block_offset + offset; |
1988 | 2da776db | Michael R. Hines | uint64_t index = rdma->current_index; |
1989 | 2da776db | Michael R. Hines | uint64_t chunk = rdma->current_chunk; |
1990 | 2da776db | Michael R. Hines | int ret;
|
1991 | 2da776db | Michael R. Hines | |
1992 | 2da776db | Michael R. Hines | /* If we cannot merge it, we flush the current buffer first. */
|
1993 | 2da776db | Michael R. Hines | if (!qemu_rdma_buffer_mergable(rdma, current_addr, len)) {
|
1994 | 2da776db | Michael R. Hines | ret = qemu_rdma_write_flush(f, rdma); |
1995 | 2da776db | Michael R. Hines | if (ret) {
|
1996 | 2da776db | Michael R. Hines | return ret;
|
1997 | 2da776db | Michael R. Hines | } |
1998 | 2da776db | Michael R. Hines | rdma->current_length = 0;
|
1999 | 2da776db | Michael R. Hines | rdma->current_addr = current_addr; |
2000 | 2da776db | Michael R. Hines | |
2001 | 2da776db | Michael R. Hines | ret = qemu_rdma_search_ram_block(rdma, block_offset, |
2002 | 2da776db | Michael R. Hines | offset, len, &index, &chunk); |
2003 | 2da776db | Michael R. Hines | if (ret) {
|
2004 | 2da776db | Michael R. Hines | fprintf(stderr, "ram block search failed\n");
|
2005 | 2da776db | Michael R. Hines | return ret;
|
2006 | 2da776db | Michael R. Hines | } |
2007 | 2da776db | Michael R. Hines | rdma->current_index = index; |
2008 | 2da776db | Michael R. Hines | rdma->current_chunk = chunk; |
2009 | 2da776db | Michael R. Hines | } |
2010 | 2da776db | Michael R. Hines | |
2011 | 2da776db | Michael R. Hines | /* merge it */
|
2012 | 2da776db | Michael R. Hines | rdma->current_length += len; |
2013 | 2da776db | Michael R. Hines | |
2014 | 2da776db | Michael R. Hines | /* flush it if buffer is too large */
|
2015 | 2da776db | Michael R. Hines | if (rdma->current_length >= RDMA_MERGE_MAX) {
|
2016 | 2da776db | Michael R. Hines | return qemu_rdma_write_flush(f, rdma);
|
2017 | 2da776db | Michael R. Hines | } |
2018 | 2da776db | Michael R. Hines | |
2019 | 2da776db | Michael R. Hines | return 0; |
2020 | 2da776db | Michael R. Hines | } |
2021 | 2da776db | Michael R. Hines | |
2022 | 2da776db | Michael R. Hines | static void qemu_rdma_cleanup(RDMAContext *rdma) |
2023 | 2da776db | Michael R. Hines | { |
2024 | 2da776db | Michael R. Hines | struct rdma_cm_event *cm_event;
|
2025 | 2da776db | Michael R. Hines | int ret, idx;
|
2026 | 2da776db | Michael R. Hines | |
2027 | 2da776db | Michael R. Hines | if (rdma->cm_id) {
|
2028 | 2da776db | Michael R. Hines | if (rdma->error_state) {
|
2029 | 2da776db | Michael R. Hines | RDMAControlHeader head = { .len = 0,
|
2030 | 2da776db | Michael R. Hines | .type = RDMA_CONTROL_ERROR, |
2031 | 2da776db | Michael R. Hines | .repeat = 1,
|
2032 | 2da776db | Michael R. Hines | }; |
2033 | 2da776db | Michael R. Hines | fprintf(stderr, "Early error. Sending error.\n");
|
2034 | 2da776db | Michael R. Hines | qemu_rdma_post_send_control(rdma, NULL, &head);
|
2035 | 2da776db | Michael R. Hines | } |
2036 | 2da776db | Michael R. Hines | |
2037 | 2da776db | Michael R. Hines | ret = rdma_disconnect(rdma->cm_id); |
2038 | 2da776db | Michael R. Hines | if (!ret) {
|
2039 | 2da776db | Michael R. Hines | DDPRINTF("waiting for disconnect\n");
|
2040 | 2da776db | Michael R. Hines | ret = rdma_get_cm_event(rdma->channel, &cm_event); |
2041 | 2da776db | Michael R. Hines | if (!ret) {
|
2042 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
2043 | 2da776db | Michael R. Hines | } |
2044 | 2da776db | Michael R. Hines | } |
2045 | 2da776db | Michael R. Hines | DDPRINTF("Disconnected.\n");
|
2046 | 2da776db | Michael R. Hines | rdma->cm_id = NULL;
|
2047 | 2da776db | Michael R. Hines | } |
2048 | 2da776db | Michael R. Hines | |
2049 | 2da776db | Michael R. Hines | g_free(rdma->block); |
2050 | 2da776db | Michael R. Hines | rdma->block = NULL;
|
2051 | 2da776db | Michael R. Hines | |
2052 | 2da776db | Michael R. Hines | for (idx = 0; idx <= RDMA_WRID_MAX; idx++) { |
2053 | 2da776db | Michael R. Hines | if (rdma->wr_data[idx].control_mr) {
|
2054 | 2da776db | Michael R. Hines | rdma->total_registrations--; |
2055 | 2da776db | Michael R. Hines | ibv_dereg_mr(rdma->wr_data[idx].control_mr); |
2056 | 2da776db | Michael R. Hines | } |
2057 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control_mr = NULL;
|
2058 | 2da776db | Michael R. Hines | } |
2059 | 2da776db | Michael R. Hines | |
2060 | 2da776db | Michael R. Hines | if (rdma->local_ram_blocks.block) {
|
2061 | 2da776db | Michael R. Hines | while (rdma->local_ram_blocks.nb_blocks) {
|
2062 | 2da776db | Michael R. Hines | __qemu_rdma_delete_block(rdma, |
2063 | 2da776db | Michael R. Hines | rdma->local_ram_blocks.block->offset); |
2064 | 2da776db | Michael R. Hines | } |
2065 | 2da776db | Michael R. Hines | } |
2066 | 2da776db | Michael R. Hines | |
2067 | 2da776db | Michael R. Hines | if (rdma->qp) {
|
2068 | 2da776db | Michael R. Hines | ibv_destroy_qp(rdma->qp); |
2069 | 2da776db | Michael R. Hines | rdma->qp = NULL;
|
2070 | 2da776db | Michael R. Hines | } |
2071 | 2da776db | Michael R. Hines | if (rdma->cq) {
|
2072 | 2da776db | Michael R. Hines | ibv_destroy_cq(rdma->cq); |
2073 | 2da776db | Michael R. Hines | rdma->cq = NULL;
|
2074 | 2da776db | Michael R. Hines | } |
2075 | 2da776db | Michael R. Hines | if (rdma->comp_channel) {
|
2076 | 2da776db | Michael R. Hines | ibv_destroy_comp_channel(rdma->comp_channel); |
2077 | 2da776db | Michael R. Hines | rdma->comp_channel = NULL;
|
2078 | 2da776db | Michael R. Hines | } |
2079 | 2da776db | Michael R. Hines | if (rdma->pd) {
|
2080 | 2da776db | Michael R. Hines | ibv_dealloc_pd(rdma->pd); |
2081 | 2da776db | Michael R. Hines | rdma->pd = NULL;
|
2082 | 2da776db | Michael R. Hines | } |
2083 | 2da776db | Michael R. Hines | if (rdma->listen_id) {
|
2084 | 2da776db | Michael R. Hines | rdma_destroy_id(rdma->listen_id); |
2085 | 2da776db | Michael R. Hines | rdma->listen_id = NULL;
|
2086 | 2da776db | Michael R. Hines | } |
2087 | 2da776db | Michael R. Hines | if (rdma->cm_id) {
|
2088 | 2da776db | Michael R. Hines | rdma_destroy_id(rdma->cm_id); |
2089 | 2da776db | Michael R. Hines | rdma->cm_id = NULL;
|
2090 | 2da776db | Michael R. Hines | } |
2091 | 2da776db | Michael R. Hines | if (rdma->channel) {
|
2092 | 2da776db | Michael R. Hines | rdma_destroy_event_channel(rdma->channel); |
2093 | 2da776db | Michael R. Hines | rdma->channel = NULL;
|
2094 | 2da776db | Michael R. Hines | } |
2095 | 2da776db | Michael R. Hines | } |
2096 | 2da776db | Michael R. Hines | |
2097 | 2da776db | Michael R. Hines | |
2098 | 2da776db | Michael R. Hines | static int qemu_rdma_source_init(RDMAContext *rdma, Error **errp, bool pin_all) |
2099 | 2da776db | Michael R. Hines | { |
2100 | 2da776db | Michael R. Hines | int ret, idx;
|
2101 | 2da776db | Michael R. Hines | Error *local_err = NULL, **temp = &local_err;
|
2102 | 2da776db | Michael R. Hines | |
2103 | 2da776db | Michael R. Hines | /*
|
2104 | 2da776db | Michael R. Hines | * Will be validated against destination's actual capabilities
|
2105 | 2da776db | Michael R. Hines | * after the connect() completes.
|
2106 | 2da776db | Michael R. Hines | */
|
2107 | 2da776db | Michael R. Hines | rdma->pin_all = pin_all; |
2108 | 2da776db | Michael R. Hines | |
2109 | 2da776db | Michael R. Hines | ret = qemu_rdma_resolve_host(rdma, temp); |
2110 | 2da776db | Michael R. Hines | if (ret) {
|
2111 | 2da776db | Michael R. Hines | goto err_rdma_source_init;
|
2112 | 2da776db | Michael R. Hines | } |
2113 | 2da776db | Michael R. Hines | |
2114 | 2da776db | Michael R. Hines | ret = qemu_rdma_alloc_pd_cq(rdma); |
2115 | 2da776db | Michael R. Hines | if (ret) {
|
2116 | 2da776db | Michael R. Hines | ERROR(temp, "rdma migration: error allocating pd and cq! Your mlock()"
|
2117 | 2da776db | Michael R. Hines | " limits may be too low. Please check $ ulimit -a # and "
|
2118 | 2da776db | Michael R. Hines | "search for 'ulimit -l' in the output\n");
|
2119 | 2da776db | Michael R. Hines | goto err_rdma_source_init;
|
2120 | 2da776db | Michael R. Hines | } |
2121 | 2da776db | Michael R. Hines | |
2122 | 2da776db | Michael R. Hines | ret = qemu_rdma_alloc_qp(rdma); |
2123 | 2da776db | Michael R. Hines | if (ret) {
|
2124 | 2da776db | Michael R. Hines | ERROR(temp, "rdma migration: error allocating qp!\n");
|
2125 | 2da776db | Michael R. Hines | goto err_rdma_source_init;
|
2126 | 2da776db | Michael R. Hines | } |
2127 | 2da776db | Michael R. Hines | |
2128 | 2da776db | Michael R. Hines | ret = qemu_rdma_init_ram_blocks(rdma); |
2129 | 2da776db | Michael R. Hines | if (ret) {
|
2130 | 2da776db | Michael R. Hines | ERROR(temp, "rdma migration: error initializing ram blocks!\n");
|
2131 | 2da776db | Michael R. Hines | goto err_rdma_source_init;
|
2132 | 2da776db | Michael R. Hines | } |
2133 | 2da776db | Michael R. Hines | |
2134 | 2da776db | Michael R. Hines | for (idx = 0; idx <= RDMA_WRID_MAX; idx++) { |
2135 | 2da776db | Michael R. Hines | ret = qemu_rdma_reg_control(rdma, idx); |
2136 | 2da776db | Michael R. Hines | if (ret) {
|
2137 | 2da776db | Michael R. Hines | ERROR(temp, "rdma migration: error registering %d control!\n",
|
2138 | 2da776db | Michael R. Hines | idx); |
2139 | 2da776db | Michael R. Hines | goto err_rdma_source_init;
|
2140 | 2da776db | Michael R. Hines | } |
2141 | 2da776db | Michael R. Hines | } |
2142 | 2da776db | Michael R. Hines | |
2143 | 2da776db | Michael R. Hines | return 0; |
2144 | 2da776db | Michael R. Hines | |
2145 | 2da776db | Michael R. Hines | err_rdma_source_init:
|
2146 | 2da776db | Michael R. Hines | error_propagate(errp, local_err); |
2147 | 2da776db | Michael R. Hines | qemu_rdma_cleanup(rdma); |
2148 | 2da776db | Michael R. Hines | return -1; |
2149 | 2da776db | Michael R. Hines | } |
2150 | 2da776db | Michael R. Hines | |
2151 | 2da776db | Michael R. Hines | static int qemu_rdma_connect(RDMAContext *rdma, Error **errp) |
2152 | 2da776db | Michael R. Hines | { |
2153 | 2da776db | Michael R. Hines | RDMACapabilities cap = { |
2154 | 2da776db | Michael R. Hines | .version = RDMA_CONTROL_VERSION_CURRENT, |
2155 | 2da776db | Michael R. Hines | .flags = 0,
|
2156 | 2da776db | Michael R. Hines | }; |
2157 | 2da776db | Michael R. Hines | struct rdma_conn_param conn_param = { .initiator_depth = 2, |
2158 | 2da776db | Michael R. Hines | .retry_count = 5,
|
2159 | 2da776db | Michael R. Hines | .private_data = &cap, |
2160 | 2da776db | Michael R. Hines | .private_data_len = sizeof(cap),
|
2161 | 2da776db | Michael R. Hines | }; |
2162 | 2da776db | Michael R. Hines | struct rdma_cm_event *cm_event;
|
2163 | 2da776db | Michael R. Hines | int ret;
|
2164 | 2da776db | Michael R. Hines | |
2165 | 2da776db | Michael R. Hines | /*
|
2166 | 2da776db | Michael R. Hines | * Only negotiate the capability with destination if the user
|
2167 | 2da776db | Michael R. Hines | * on the source first requested the capability.
|
2168 | 2da776db | Michael R. Hines | */
|
2169 | 2da776db | Michael R. Hines | if (rdma->pin_all) {
|
2170 | 2da776db | Michael R. Hines | DPRINTF("Server pin-all memory requested.\n");
|
2171 | 2da776db | Michael R. Hines | cap.flags |= RDMA_CAPABILITY_PIN_ALL; |
2172 | 2da776db | Michael R. Hines | } |
2173 | 2da776db | Michael R. Hines | |
2174 | 2da776db | Michael R. Hines | caps_to_network(&cap); |
2175 | 2da776db | Michael R. Hines | |
2176 | 2da776db | Michael R. Hines | ret = rdma_connect(rdma->cm_id, &conn_param); |
2177 | 2da776db | Michael R. Hines | if (ret) {
|
2178 | 2da776db | Michael R. Hines | perror("rdma_connect");
|
2179 | 2da776db | Michael R. Hines | ERROR(errp, "connecting to destination!\n");
|
2180 | 2da776db | Michael R. Hines | rdma_destroy_id(rdma->cm_id); |
2181 | 2da776db | Michael R. Hines | rdma->cm_id = NULL;
|
2182 | 2da776db | Michael R. Hines | goto err_rdma_source_connect;
|
2183 | 2da776db | Michael R. Hines | } |
2184 | 2da776db | Michael R. Hines | |
2185 | 2da776db | Michael R. Hines | ret = rdma_get_cm_event(rdma->channel, &cm_event); |
2186 | 2da776db | Michael R. Hines | if (ret) {
|
2187 | 2da776db | Michael R. Hines | perror("rdma_get_cm_event after rdma_connect");
|
2188 | 2da776db | Michael R. Hines | ERROR(errp, "connecting to destination!\n");
|
2189 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
2190 | 2da776db | Michael R. Hines | rdma_destroy_id(rdma->cm_id); |
2191 | 2da776db | Michael R. Hines | rdma->cm_id = NULL;
|
2192 | 2da776db | Michael R. Hines | goto err_rdma_source_connect;
|
2193 | 2da776db | Michael R. Hines | } |
2194 | 2da776db | Michael R. Hines | |
2195 | 2da776db | Michael R. Hines | if (cm_event->event != RDMA_CM_EVENT_ESTABLISHED) {
|
2196 | 2da776db | Michael R. Hines | perror("rdma_get_cm_event != EVENT_ESTABLISHED after rdma_connect");
|
2197 | 2da776db | Michael R. Hines | ERROR(errp, "connecting to destination!\n");
|
2198 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
2199 | 2da776db | Michael R. Hines | rdma_destroy_id(rdma->cm_id); |
2200 | 2da776db | Michael R. Hines | rdma->cm_id = NULL;
|
2201 | 2da776db | Michael R. Hines | goto err_rdma_source_connect;
|
2202 | 2da776db | Michael R. Hines | } |
2203 | 2da776db | Michael R. Hines | |
2204 | 2da776db | Michael R. Hines | memcpy(&cap, cm_event->param.conn.private_data, sizeof(cap));
|
2205 | 2da776db | Michael R. Hines | network_to_caps(&cap); |
2206 | 2da776db | Michael R. Hines | |
2207 | 2da776db | Michael R. Hines | /*
|
2208 | 2da776db | Michael R. Hines | * Verify that the *requested* capabilities are supported by the destination
|
2209 | 2da776db | Michael R. Hines | * and disable them otherwise.
|
2210 | 2da776db | Michael R. Hines | */
|
2211 | 2da776db | Michael R. Hines | if (rdma->pin_all && !(cap.flags & RDMA_CAPABILITY_PIN_ALL)) {
|
2212 | 2da776db | Michael R. Hines | ERROR(errp, "Server cannot support pinning all memory. "
|
2213 | 2da776db | Michael R. Hines | "Will register memory dynamically.\n");
|
2214 | 2da776db | Michael R. Hines | rdma->pin_all = false;
|
2215 | 2da776db | Michael R. Hines | } |
2216 | 2da776db | Michael R. Hines | |
2217 | 2da776db | Michael R. Hines | DPRINTF("Pin all memory: %s\n", rdma->pin_all ? "enabled" : "disabled"); |
2218 | 2da776db | Michael R. Hines | |
2219 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
2220 | 2da776db | Michael R. Hines | |
2221 | 2da776db | Michael R. Hines | ret = qemu_rdma_post_recv_control(rdma, 0);
|
2222 | 2da776db | Michael R. Hines | if (ret) {
|
2223 | 2da776db | Michael R. Hines | ERROR(errp, "posting second control recv!\n");
|
2224 | 2da776db | Michael R. Hines | goto err_rdma_source_connect;
|
2225 | 2da776db | Michael R. Hines | } |
2226 | 2da776db | Michael R. Hines | |
2227 | 2da776db | Michael R. Hines | rdma->control_ready_expected = 1;
|
2228 | 2da776db | Michael R. Hines | rdma->nb_sent = 0;
|
2229 | 2da776db | Michael R. Hines | return 0; |
2230 | 2da776db | Michael R. Hines | |
2231 | 2da776db | Michael R. Hines | err_rdma_source_connect:
|
2232 | 2da776db | Michael R. Hines | qemu_rdma_cleanup(rdma); |
2233 | 2da776db | Michael R. Hines | return -1; |
2234 | 2da776db | Michael R. Hines | } |
2235 | 2da776db | Michael R. Hines | |
2236 | 2da776db | Michael R. Hines | static int qemu_rdma_dest_init(RDMAContext *rdma, Error **errp) |
2237 | 2da776db | Michael R. Hines | { |
2238 | 2da776db | Michael R. Hines | int ret = -EINVAL, idx;
|
2239 | 2da776db | Michael R. Hines | struct sockaddr_in sin;
|
2240 | 2da776db | Michael R. Hines | struct rdma_cm_id *listen_id;
|
2241 | 2da776db | Michael R. Hines | char ip[40] = "unknown"; |
2242 | 2da776db | Michael R. Hines | |
2243 | 2da776db | Michael R. Hines | for (idx = 0; idx <= RDMA_WRID_MAX; idx++) { |
2244 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control_len = 0;
|
2245 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control_curr = NULL;
|
2246 | 2da776db | Michael R. Hines | } |
2247 | 2da776db | Michael R. Hines | |
2248 | 2da776db | Michael R. Hines | if (rdma->host == NULL) { |
2249 | 2da776db | Michael R. Hines | ERROR(errp, "RDMA host is not set!\n");
|
2250 | 2da776db | Michael R. Hines | rdma->error_state = -EINVAL; |
2251 | 2da776db | Michael R. Hines | return -1; |
2252 | 2da776db | Michael R. Hines | } |
2253 | 2da776db | Michael R. Hines | /* create CM channel */
|
2254 | 2da776db | Michael R. Hines | rdma->channel = rdma_create_event_channel(); |
2255 | 2da776db | Michael R. Hines | if (!rdma->channel) {
|
2256 | 2da776db | Michael R. Hines | ERROR(errp, "could not create rdma event channel\n");
|
2257 | 2da776db | Michael R. Hines | rdma->error_state = -EINVAL; |
2258 | 2da776db | Michael R. Hines | return -1; |
2259 | 2da776db | Michael R. Hines | } |
2260 | 2da776db | Michael R. Hines | |
2261 | 2da776db | Michael R. Hines | /* create CM id */
|
2262 | 2da776db | Michael R. Hines | ret = rdma_create_id(rdma->channel, &listen_id, NULL, RDMA_PS_TCP);
|
2263 | 2da776db | Michael R. Hines | if (ret) {
|
2264 | 2da776db | Michael R. Hines | ERROR(errp, "could not create cm_id!\n");
|
2265 | 2da776db | Michael R. Hines | goto err_dest_init_create_listen_id;
|
2266 | 2da776db | Michael R. Hines | } |
2267 | 2da776db | Michael R. Hines | |
2268 | 2da776db | Michael R. Hines | memset(&sin, 0, sizeof(sin)); |
2269 | 2da776db | Michael R. Hines | sin.sin_family = AF_INET; |
2270 | 2da776db | Michael R. Hines | sin.sin_port = htons(rdma->port); |
2271 | 2da776db | Michael R. Hines | |
2272 | 2da776db | Michael R. Hines | if (rdma->host && strcmp("", rdma->host)) { |
2273 | 2da776db | Michael R. Hines | struct hostent *dest_addr;
|
2274 | 2da776db | Michael R. Hines | dest_addr = gethostbyname(rdma->host); |
2275 | 2da776db | Michael R. Hines | if (!dest_addr) {
|
2276 | 2da776db | Michael R. Hines | ERROR(errp, "migration could not gethostbyname!\n");
|
2277 | 2da776db | Michael R. Hines | ret = -EINVAL; |
2278 | 2da776db | Michael R. Hines | goto err_dest_init_bind_addr;
|
2279 | 2da776db | Michael R. Hines | } |
2280 | 2da776db | Michael R. Hines | memcpy(&sin.sin_addr.s_addr, dest_addr->h_addr, |
2281 | 2da776db | Michael R. Hines | dest_addr->h_length); |
2282 | 2da776db | Michael R. Hines | inet_ntop(AF_INET, dest_addr->h_addr, ip, sizeof ip);
|
2283 | 2da776db | Michael R. Hines | } else {
|
2284 | 2da776db | Michael R. Hines | sin.sin_addr.s_addr = INADDR_ANY; |
2285 | 2da776db | Michael R. Hines | } |
2286 | 2da776db | Michael R. Hines | |
2287 | 2da776db | Michael R. Hines | DPRINTF("%s => %s\n", rdma->host, ip);
|
2288 | 2da776db | Michael R. Hines | |
2289 | 2da776db | Michael R. Hines | ret = rdma_bind_addr(listen_id, (struct sockaddr *)&sin);
|
2290 | 2da776db | Michael R. Hines | if (ret) {
|
2291 | 2da776db | Michael R. Hines | ERROR(errp, "Error: could not rdma_bind_addr!\n");
|
2292 | 2da776db | Michael R. Hines | goto err_dest_init_bind_addr;
|
2293 | 2da776db | Michael R. Hines | } |
2294 | 2da776db | Michael R. Hines | |
2295 | 2da776db | Michael R. Hines | rdma->listen_id = listen_id; |
2296 | 2da776db | Michael R. Hines | qemu_rdma_dump_gid("dest_init", listen_id);
|
2297 | 2da776db | Michael R. Hines | return 0; |
2298 | 2da776db | Michael R. Hines | |
2299 | 2da776db | Michael R. Hines | err_dest_init_bind_addr:
|
2300 | 2da776db | Michael R. Hines | rdma_destroy_id(listen_id); |
2301 | 2da776db | Michael R. Hines | err_dest_init_create_listen_id:
|
2302 | 2da776db | Michael R. Hines | rdma_destroy_event_channel(rdma->channel); |
2303 | 2da776db | Michael R. Hines | rdma->channel = NULL;
|
2304 | 2da776db | Michael R. Hines | rdma->error_state = ret; |
2305 | 2da776db | Michael R. Hines | return ret;
|
2306 | 2da776db | Michael R. Hines | |
2307 | 2da776db | Michael R. Hines | } |
2308 | 2da776db | Michael R. Hines | |
2309 | 2da776db | Michael R. Hines | static void *qemu_rdma_data_init(const char *host_port, Error **errp) |
2310 | 2da776db | Michael R. Hines | { |
2311 | 2da776db | Michael R. Hines | RDMAContext *rdma = NULL;
|
2312 | 2da776db | Michael R. Hines | InetSocketAddress *addr; |
2313 | 2da776db | Michael R. Hines | |
2314 | 2da776db | Michael R. Hines | if (host_port) {
|
2315 | 2da776db | Michael R. Hines | rdma = g_malloc0(sizeof(RDMAContext));
|
2316 | 2da776db | Michael R. Hines | memset(rdma, 0, sizeof(RDMAContext)); |
2317 | 2da776db | Michael R. Hines | rdma->current_index = -1;
|
2318 | 2da776db | Michael R. Hines | rdma->current_chunk = -1;
|
2319 | 2da776db | Michael R. Hines | |
2320 | 2da776db | Michael R. Hines | addr = inet_parse(host_port, NULL);
|
2321 | 2da776db | Michael R. Hines | if (addr != NULL) { |
2322 | 2da776db | Michael R. Hines | rdma->port = atoi(addr->port); |
2323 | 2da776db | Michael R. Hines | rdma->host = g_strdup(addr->host); |
2324 | 2da776db | Michael R. Hines | } else {
|
2325 | 2da776db | Michael R. Hines | ERROR(errp, "bad RDMA migration address '%s'", host_port);
|
2326 | 2da776db | Michael R. Hines | g_free(rdma); |
2327 | 2da776db | Michael R. Hines | return NULL; |
2328 | 2da776db | Michael R. Hines | } |
2329 | 2da776db | Michael R. Hines | } |
2330 | 2da776db | Michael R. Hines | |
2331 | 2da776db | Michael R. Hines | return rdma;
|
2332 | 2da776db | Michael R. Hines | } |
2333 | 2da776db | Michael R. Hines | |
2334 | 2da776db | Michael R. Hines | /*
|
2335 | 2da776db | Michael R. Hines | * QEMUFile interface to the control channel.
|
2336 | 2da776db | Michael R. Hines | * SEND messages for control only.
|
2337 | 2da776db | Michael R. Hines | * pc.ram is handled with regular RDMA messages.
|
2338 | 2da776db | Michael R. Hines | */
|
2339 | 2da776db | Michael R. Hines | static int qemu_rdma_put_buffer(void *opaque, const uint8_t *buf, |
2340 | 2da776db | Michael R. Hines | int64_t pos, int size)
|
2341 | 2da776db | Michael R. Hines | { |
2342 | 2da776db | Michael R. Hines | QEMUFileRDMA *r = opaque; |
2343 | 2da776db | Michael R. Hines | QEMUFile *f = r->file; |
2344 | 2da776db | Michael R. Hines | RDMAContext *rdma = r->rdma; |
2345 | 2da776db | Michael R. Hines | size_t remaining = size; |
2346 | 2da776db | Michael R. Hines | uint8_t * data = (void *) buf;
|
2347 | 2da776db | Michael R. Hines | int ret;
|
2348 | 2da776db | Michael R. Hines | |
2349 | 2da776db | Michael R. Hines | CHECK_ERROR_STATE(); |
2350 | 2da776db | Michael R. Hines | |
2351 | 2da776db | Michael R. Hines | /*
|
2352 | 2da776db | Michael R. Hines | * Push out any writes that
|
2353 | 2da776db | Michael R. Hines | * we're queued up for pc.ram.
|
2354 | 2da776db | Michael R. Hines | */
|
2355 | 2da776db | Michael R. Hines | ret = qemu_rdma_write_flush(f, rdma); |
2356 | 2da776db | Michael R. Hines | if (ret < 0) { |
2357 | 2da776db | Michael R. Hines | rdma->error_state = ret; |
2358 | 2da776db | Michael R. Hines | return ret;
|
2359 | 2da776db | Michael R. Hines | } |
2360 | 2da776db | Michael R. Hines | |
2361 | 2da776db | Michael R. Hines | while (remaining) {
|
2362 | 2da776db | Michael R. Hines | RDMAControlHeader head; |
2363 | 2da776db | Michael R. Hines | |
2364 | 2da776db | Michael R. Hines | r->len = MIN(remaining, RDMA_SEND_INCREMENT); |
2365 | 2da776db | Michael R. Hines | remaining -= r->len; |
2366 | 2da776db | Michael R. Hines | |
2367 | 2da776db | Michael R. Hines | head.len = r->len; |
2368 | 2da776db | Michael R. Hines | head.type = RDMA_CONTROL_QEMU_FILE; |
2369 | 2da776db | Michael R. Hines | |
2370 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_send(rdma, &head, data, NULL, NULL, NULL); |
2371 | 2da776db | Michael R. Hines | |
2372 | 2da776db | Michael R. Hines | if (ret < 0) { |
2373 | 2da776db | Michael R. Hines | rdma->error_state = ret; |
2374 | 2da776db | Michael R. Hines | return ret;
|
2375 | 2da776db | Michael R. Hines | } |
2376 | 2da776db | Michael R. Hines | |
2377 | 2da776db | Michael R. Hines | data += r->len; |
2378 | 2da776db | Michael R. Hines | } |
2379 | 2da776db | Michael R. Hines | |
2380 | 2da776db | Michael R. Hines | return size;
|
2381 | 2da776db | Michael R. Hines | } |
2382 | 2da776db | Michael R. Hines | |
2383 | 2da776db | Michael R. Hines | static size_t qemu_rdma_fill(RDMAContext *rdma, uint8_t *buf,
|
2384 | 2da776db | Michael R. Hines | int size, int idx) |
2385 | 2da776db | Michael R. Hines | { |
2386 | 2da776db | Michael R. Hines | size_t len = 0;
|
2387 | 2da776db | Michael R. Hines | |
2388 | 2da776db | Michael R. Hines | if (rdma->wr_data[idx].control_len) {
|
2389 | 2da776db | Michael R. Hines | DDDPRINTF("RDMA %" PRId64 " of %d bytes already in buffer\n", |
2390 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control_len, size); |
2391 | 2da776db | Michael R. Hines | |
2392 | 2da776db | Michael R. Hines | len = MIN(size, rdma->wr_data[idx].control_len); |
2393 | 2da776db | Michael R. Hines | memcpy(buf, rdma->wr_data[idx].control_curr, len); |
2394 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control_curr += len; |
2395 | 2da776db | Michael R. Hines | rdma->wr_data[idx].control_len -= len; |
2396 | 2da776db | Michael R. Hines | } |
2397 | 2da776db | Michael R. Hines | |
2398 | 2da776db | Michael R. Hines | return len;
|
2399 | 2da776db | Michael R. Hines | } |
2400 | 2da776db | Michael R. Hines | |
2401 | 2da776db | Michael R. Hines | /*
|
2402 | 2da776db | Michael R. Hines | * QEMUFile interface to the control channel.
|
2403 | 2da776db | Michael R. Hines | * RDMA links don't use bytestreams, so we have to
|
2404 | 2da776db | Michael R. Hines | * return bytes to QEMUFile opportunistically.
|
2405 | 2da776db | Michael R. Hines | */
|
2406 | 2da776db | Michael R. Hines | static int qemu_rdma_get_buffer(void *opaque, uint8_t *buf, |
2407 | 2da776db | Michael R. Hines | int64_t pos, int size)
|
2408 | 2da776db | Michael R. Hines | { |
2409 | 2da776db | Michael R. Hines | QEMUFileRDMA *r = opaque; |
2410 | 2da776db | Michael R. Hines | RDMAContext *rdma = r->rdma; |
2411 | 2da776db | Michael R. Hines | RDMAControlHeader head; |
2412 | 2da776db | Michael R. Hines | int ret = 0; |
2413 | 2da776db | Michael R. Hines | |
2414 | 2da776db | Michael R. Hines | CHECK_ERROR_STATE(); |
2415 | 2da776db | Michael R. Hines | |
2416 | 2da776db | Michael R. Hines | /*
|
2417 | 2da776db | Michael R. Hines | * First, we hold on to the last SEND message we
|
2418 | 2da776db | Michael R. Hines | * were given and dish out the bytes until we run
|
2419 | 2da776db | Michael R. Hines | * out of bytes.
|
2420 | 2da776db | Michael R. Hines | */
|
2421 | 2da776db | Michael R. Hines | r->len = qemu_rdma_fill(r->rdma, buf, size, 0);
|
2422 | 2da776db | Michael R. Hines | if (r->len) {
|
2423 | 2da776db | Michael R. Hines | return r->len;
|
2424 | 2da776db | Michael R. Hines | } |
2425 | 2da776db | Michael R. Hines | |
2426 | 2da776db | Michael R. Hines | /*
|
2427 | 2da776db | Michael R. Hines | * Once we run out, we block and wait for another
|
2428 | 2da776db | Michael R. Hines | * SEND message to arrive.
|
2429 | 2da776db | Michael R. Hines | */
|
2430 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_recv(rdma, &head, RDMA_CONTROL_QEMU_FILE); |
2431 | 2da776db | Michael R. Hines | |
2432 | 2da776db | Michael R. Hines | if (ret < 0) { |
2433 | 2da776db | Michael R. Hines | rdma->error_state = ret; |
2434 | 2da776db | Michael R. Hines | return ret;
|
2435 | 2da776db | Michael R. Hines | } |
2436 | 2da776db | Michael R. Hines | |
2437 | 2da776db | Michael R. Hines | /*
|
2438 | 2da776db | Michael R. Hines | * SEND was received with new bytes, now try again.
|
2439 | 2da776db | Michael R. Hines | */
|
2440 | 2da776db | Michael R. Hines | return qemu_rdma_fill(r->rdma, buf, size, 0); |
2441 | 2da776db | Michael R. Hines | } |
2442 | 2da776db | Michael R. Hines | |
2443 | 2da776db | Michael R. Hines | /*
|
2444 | 2da776db | Michael R. Hines | * Block until all the outstanding chunks have been delivered by the hardware.
|
2445 | 2da776db | Michael R. Hines | */
|
2446 | 2da776db | Michael R. Hines | static int qemu_rdma_drain_cq(QEMUFile *f, RDMAContext *rdma) |
2447 | 2da776db | Michael R. Hines | { |
2448 | 2da776db | Michael R. Hines | int ret;
|
2449 | 2da776db | Michael R. Hines | |
2450 | 2da776db | Michael R. Hines | if (qemu_rdma_write_flush(f, rdma) < 0) { |
2451 | 2da776db | Michael R. Hines | return -EIO;
|
2452 | 2da776db | Michael R. Hines | } |
2453 | 2da776db | Michael R. Hines | |
2454 | 2da776db | Michael R. Hines | while (rdma->nb_sent) {
|
2455 | 2da776db | Michael R. Hines | ret = qemu_rdma_block_for_wrid(rdma, RDMA_WRID_RDMA_WRITE); |
2456 | 2da776db | Michael R. Hines | if (ret < 0) { |
2457 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: complete polling error!\n");
|
2458 | 2da776db | Michael R. Hines | return -EIO;
|
2459 | 2da776db | Michael R. Hines | } |
2460 | 2da776db | Michael R. Hines | } |
2461 | 2da776db | Michael R. Hines | |
2462 | 2da776db | Michael R. Hines | qemu_rdma_unregister_waiting(rdma); |
2463 | 2da776db | Michael R. Hines | |
2464 | 2da776db | Michael R. Hines | return 0; |
2465 | 2da776db | Michael R. Hines | } |
2466 | 2da776db | Michael R. Hines | |
2467 | 2da776db | Michael R. Hines | static int qemu_rdma_close(void *opaque) |
2468 | 2da776db | Michael R. Hines | { |
2469 | 2da776db | Michael R. Hines | DPRINTF("Shutting down connection.\n");
|
2470 | 2da776db | Michael R. Hines | QEMUFileRDMA *r = opaque; |
2471 | 2da776db | Michael R. Hines | if (r->rdma) {
|
2472 | 2da776db | Michael R. Hines | qemu_rdma_cleanup(r->rdma); |
2473 | 2da776db | Michael R. Hines | g_free(r->rdma); |
2474 | 2da776db | Michael R. Hines | } |
2475 | 2da776db | Michael R. Hines | g_free(r); |
2476 | 2da776db | Michael R. Hines | return 0; |
2477 | 2da776db | Michael R. Hines | } |
2478 | 2da776db | Michael R. Hines | |
2479 | 2da776db | Michael R. Hines | /*
|
2480 | 2da776db | Michael R. Hines | * Parameters:
|
2481 | 2da776db | Michael R. Hines | * @offset == 0 :
|
2482 | 2da776db | Michael R. Hines | * This means that 'block_offset' is a full virtual address that does not
|
2483 | 2da776db | Michael R. Hines | * belong to a RAMBlock of the virtual machine and instead
|
2484 | 2da776db | Michael R. Hines | * represents a private malloc'd memory area that the caller wishes to
|
2485 | 2da776db | Michael R. Hines | * transfer.
|
2486 | 2da776db | Michael R. Hines | *
|
2487 | 2da776db | Michael R. Hines | * @offset != 0 :
|
2488 | 2da776db | Michael R. Hines | * Offset is an offset to be added to block_offset and used
|
2489 | 2da776db | Michael R. Hines | * to also lookup the corresponding RAMBlock.
|
2490 | 2da776db | Michael R. Hines | *
|
2491 | 2da776db | Michael R. Hines | * @size > 0 :
|
2492 | 2da776db | Michael R. Hines | * Initiate an transfer this size.
|
2493 | 2da776db | Michael R. Hines | *
|
2494 | 2da776db | Michael R. Hines | * @size == 0 :
|
2495 | 2da776db | Michael R. Hines | * A 'hint' or 'advice' that means that we wish to speculatively
|
2496 | 2da776db | Michael R. Hines | * and asynchronously unregister this memory. In this case, there is no
|
2497 | 52f35022 | Stefan Weil | * guarantee that the unregister will actually happen, for example,
|
2498 | 2da776db | Michael R. Hines | * if the memory is being actively transmitted. Additionally, the memory
|
2499 | 2da776db | Michael R. Hines | * may be re-registered at any future time if a write within the same
|
2500 | 2da776db | Michael R. Hines | * chunk was requested again, even if you attempted to unregister it
|
2501 | 2da776db | Michael R. Hines | * here.
|
2502 | 2da776db | Michael R. Hines | *
|
2503 | 2da776db | Michael R. Hines | * @size < 0 : TODO, not yet supported
|
2504 | 2da776db | Michael R. Hines | * Unregister the memory NOW. This means that the caller does not
|
2505 | 2da776db | Michael R. Hines | * expect there to be any future RDMA transfers and we just want to clean
|
2506 | 2da776db | Michael R. Hines | * things up. This is used in case the upper layer owns the memory and
|
2507 | 2da776db | Michael R. Hines | * cannot wait for qemu_fclose() to occur.
|
2508 | 2da776db | Michael R. Hines | *
|
2509 | 2da776db | Michael R. Hines | * @bytes_sent : User-specificed pointer to indicate how many bytes were
|
2510 | 2da776db | Michael R. Hines | * sent. Usually, this will not be more than a few bytes of
|
2511 | 2da776db | Michael R. Hines | * the protocol because most transfers are sent asynchronously.
|
2512 | 2da776db | Michael R. Hines | */
|
2513 | 2da776db | Michael R. Hines | static size_t qemu_rdma_save_page(QEMUFile *f, void *opaque, |
2514 | 2da776db | Michael R. Hines | ram_addr_t block_offset, ram_addr_t offset, |
2515 | 2da776db | Michael R. Hines | size_t size, int *bytes_sent)
|
2516 | 2da776db | Michael R. Hines | { |
2517 | 2da776db | Michael R. Hines | QEMUFileRDMA *rfile = opaque; |
2518 | 2da776db | Michael R. Hines | RDMAContext *rdma = rfile->rdma; |
2519 | 2da776db | Michael R. Hines | int ret;
|
2520 | 2da776db | Michael R. Hines | |
2521 | 2da776db | Michael R. Hines | CHECK_ERROR_STATE(); |
2522 | 2da776db | Michael R. Hines | |
2523 | 2da776db | Michael R. Hines | qemu_fflush(f); |
2524 | 2da776db | Michael R. Hines | |
2525 | 2da776db | Michael R. Hines | if (size > 0) { |
2526 | 2da776db | Michael R. Hines | /*
|
2527 | 2da776db | Michael R. Hines | * Add this page to the current 'chunk'. If the chunk
|
2528 | 2da776db | Michael R. Hines | * is full, or the page doen't belong to the current chunk,
|
2529 | 2da776db | Michael R. Hines | * an actual RDMA write will occur and a new chunk will be formed.
|
2530 | 2da776db | Michael R. Hines | */
|
2531 | 2da776db | Michael R. Hines | ret = qemu_rdma_write(f, rdma, block_offset, offset, size); |
2532 | 2da776db | Michael R. Hines | if (ret < 0) { |
2533 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: write error! %d\n", ret);
|
2534 | 2da776db | Michael R. Hines | goto err;
|
2535 | 2da776db | Michael R. Hines | } |
2536 | 2da776db | Michael R. Hines | |
2537 | 2da776db | Michael R. Hines | /*
|
2538 | 2da776db | Michael R. Hines | * We always return 1 bytes because the RDMA
|
2539 | 2da776db | Michael R. Hines | * protocol is completely asynchronous. We do not yet know
|
2540 | 2da776db | Michael R. Hines | * whether an identified chunk is zero or not because we're
|
2541 | 2da776db | Michael R. Hines | * waiting for other pages to potentially be merged with
|
2542 | 2da776db | Michael R. Hines | * the current chunk. So, we have to call qemu_update_position()
|
2543 | 2da776db | Michael R. Hines | * later on when the actual write occurs.
|
2544 | 2da776db | Michael R. Hines | */
|
2545 | 2da776db | Michael R. Hines | if (bytes_sent) {
|
2546 | 2da776db | Michael R. Hines | *bytes_sent = 1;
|
2547 | 2da776db | Michael R. Hines | } |
2548 | 2da776db | Michael R. Hines | } else {
|
2549 | 2da776db | Michael R. Hines | uint64_t index, chunk; |
2550 | 2da776db | Michael R. Hines | |
2551 | 2da776db | Michael R. Hines | /* TODO: Change QEMUFileOps prototype to be signed: size_t => long
|
2552 | 2da776db | Michael R. Hines | if (size < 0) {
|
2553 | 2da776db | Michael R. Hines | ret = qemu_rdma_drain_cq(f, rdma);
|
2554 | 2da776db | Michael R. Hines | if (ret < 0) {
|
2555 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma: failed to synchronously drain"
|
2556 | 2da776db | Michael R. Hines | " completion queue before unregistration.\n");
|
2557 | 2da776db | Michael R. Hines | goto err;
|
2558 | 2da776db | Michael R. Hines | }
|
2559 | 2da776db | Michael R. Hines | }
|
2560 | 2da776db | Michael R. Hines | */
|
2561 | 2da776db | Michael R. Hines | |
2562 | 2da776db | Michael R. Hines | ret = qemu_rdma_search_ram_block(rdma, block_offset, |
2563 | 2da776db | Michael R. Hines | offset, size, &index, &chunk); |
2564 | 2da776db | Michael R. Hines | |
2565 | 2da776db | Michael R. Hines | if (ret) {
|
2566 | 2da776db | Michael R. Hines | fprintf(stderr, "ram block search failed\n");
|
2567 | 2da776db | Michael R. Hines | goto err;
|
2568 | 2da776db | Michael R. Hines | } |
2569 | 2da776db | Michael R. Hines | |
2570 | 2da776db | Michael R. Hines | qemu_rdma_signal_unregister(rdma, index, chunk, 0);
|
2571 | 2da776db | Michael R. Hines | |
2572 | 2da776db | Michael R. Hines | /*
|
2573 | 52f35022 | Stefan Weil | * TODO: Synchronous, guaranteed unregistration (should not occur during
|
2574 | 2da776db | Michael R. Hines | * fast-path). Otherwise, unregisters will process on the next call to
|
2575 | 2da776db | Michael R. Hines | * qemu_rdma_drain_cq()
|
2576 | 2da776db | Michael R. Hines | if (size < 0) {
|
2577 | 2da776db | Michael R. Hines | qemu_rdma_unregister_waiting(rdma);
|
2578 | 2da776db | Michael R. Hines | }
|
2579 | 2da776db | Michael R. Hines | */
|
2580 | 2da776db | Michael R. Hines | } |
2581 | 2da776db | Michael R. Hines | |
2582 | 2da776db | Michael R. Hines | /*
|
2583 | 2da776db | Michael R. Hines | * Drain the Completion Queue if possible, but do not block,
|
2584 | 2da776db | Michael R. Hines | * just poll.
|
2585 | 2da776db | Michael R. Hines | *
|
2586 | 2da776db | Michael R. Hines | * If nothing to poll, the end of the iteration will do this
|
2587 | 2da776db | Michael R. Hines | * again to make sure we don't overflow the request queue.
|
2588 | 2da776db | Michael R. Hines | */
|
2589 | 2da776db | Michael R. Hines | while (1) { |
2590 | 2da776db | Michael R. Hines | uint64_t wr_id, wr_id_in; |
2591 | 2da776db | Michael R. Hines | int ret = qemu_rdma_poll(rdma, &wr_id_in);
|
2592 | 2da776db | Michael R. Hines | if (ret < 0) { |
2593 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: polling error! %d\n", ret);
|
2594 | 2da776db | Michael R. Hines | goto err;
|
2595 | 2da776db | Michael R. Hines | } |
2596 | 2da776db | Michael R. Hines | |
2597 | 2da776db | Michael R. Hines | wr_id = wr_id_in & RDMA_WRID_TYPE_MASK; |
2598 | 2da776db | Michael R. Hines | |
2599 | 2da776db | Michael R. Hines | if (wr_id == RDMA_WRID_NONE) {
|
2600 | 2da776db | Michael R. Hines | break;
|
2601 | 2da776db | Michael R. Hines | } |
2602 | 2da776db | Michael R. Hines | } |
2603 | 2da776db | Michael R. Hines | |
2604 | 2da776db | Michael R. Hines | return RAM_SAVE_CONTROL_DELAYED;
|
2605 | 2da776db | Michael R. Hines | err:
|
2606 | 2da776db | Michael R. Hines | rdma->error_state = ret; |
2607 | 2da776db | Michael R. Hines | return ret;
|
2608 | 2da776db | Michael R. Hines | } |
2609 | 2da776db | Michael R. Hines | |
2610 | 2da776db | Michael R. Hines | static int qemu_rdma_accept(RDMAContext *rdma) |
2611 | 2da776db | Michael R. Hines | { |
2612 | 2da776db | Michael R. Hines | RDMACapabilities cap; |
2613 | 2da776db | Michael R. Hines | struct rdma_conn_param conn_param = {
|
2614 | 2da776db | Michael R. Hines | .responder_resources = 2,
|
2615 | 2da776db | Michael R. Hines | .private_data = &cap, |
2616 | 2da776db | Michael R. Hines | .private_data_len = sizeof(cap),
|
2617 | 2da776db | Michael R. Hines | }; |
2618 | 2da776db | Michael R. Hines | struct rdma_cm_event *cm_event;
|
2619 | 2da776db | Michael R. Hines | struct ibv_context *verbs;
|
2620 | 2da776db | Michael R. Hines | int ret = -EINVAL;
|
2621 | 2da776db | Michael R. Hines | int idx;
|
2622 | 2da776db | Michael R. Hines | |
2623 | 2da776db | Michael R. Hines | ret = rdma_get_cm_event(rdma->channel, &cm_event); |
2624 | 2da776db | Michael R. Hines | if (ret) {
|
2625 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2626 | 2da776db | Michael R. Hines | } |
2627 | 2da776db | Michael R. Hines | |
2628 | 2da776db | Michael R. Hines | if (cm_event->event != RDMA_CM_EVENT_CONNECT_REQUEST) {
|
2629 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
2630 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2631 | 2da776db | Michael R. Hines | } |
2632 | 2da776db | Michael R. Hines | |
2633 | 2da776db | Michael R. Hines | memcpy(&cap, cm_event->param.conn.private_data, sizeof(cap));
|
2634 | 2da776db | Michael R. Hines | |
2635 | 2da776db | Michael R. Hines | network_to_caps(&cap); |
2636 | 2da776db | Michael R. Hines | |
2637 | 2da776db | Michael R. Hines | if (cap.version < 1 || cap.version > RDMA_CONTROL_VERSION_CURRENT) { |
2638 | 2da776db | Michael R. Hines | fprintf(stderr, "Unknown source RDMA version: %d, bailing...\n",
|
2639 | 2da776db | Michael R. Hines | cap.version); |
2640 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
2641 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2642 | 2da776db | Michael R. Hines | } |
2643 | 2da776db | Michael R. Hines | |
2644 | 2da776db | Michael R. Hines | /*
|
2645 | 2da776db | Michael R. Hines | * Respond with only the capabilities this version of QEMU knows about.
|
2646 | 2da776db | Michael R. Hines | */
|
2647 | 2da776db | Michael R. Hines | cap.flags &= known_capabilities; |
2648 | 2da776db | Michael R. Hines | |
2649 | 2da776db | Michael R. Hines | /*
|
2650 | 2da776db | Michael R. Hines | * Enable the ones that we do know about.
|
2651 | 2da776db | Michael R. Hines | * Add other checks here as new ones are introduced.
|
2652 | 2da776db | Michael R. Hines | */
|
2653 | 2da776db | Michael R. Hines | if (cap.flags & RDMA_CAPABILITY_PIN_ALL) {
|
2654 | 2da776db | Michael R. Hines | rdma->pin_all = true;
|
2655 | 2da776db | Michael R. Hines | } |
2656 | 2da776db | Michael R. Hines | |
2657 | 2da776db | Michael R. Hines | rdma->cm_id = cm_event->id; |
2658 | 2da776db | Michael R. Hines | verbs = cm_event->id->verbs; |
2659 | 2da776db | Michael R. Hines | |
2660 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
2661 | 2da776db | Michael R. Hines | |
2662 | 2da776db | Michael R. Hines | DPRINTF("Memory pin all: %s\n", rdma->pin_all ? "enabled" : "disabled"); |
2663 | 2da776db | Michael R. Hines | |
2664 | 2da776db | Michael R. Hines | caps_to_network(&cap); |
2665 | 2da776db | Michael R. Hines | |
2666 | 2da776db | Michael R. Hines | DPRINTF("verbs context after listen: %p\n", verbs);
|
2667 | 2da776db | Michael R. Hines | |
2668 | 2da776db | Michael R. Hines | if (!rdma->verbs) {
|
2669 | 2da776db | Michael R. Hines | rdma->verbs = verbs; |
2670 | 2da776db | Michael R. Hines | } else if (rdma->verbs != verbs) { |
2671 | 2da776db | Michael R. Hines | fprintf(stderr, "ibv context not matching %p, %p!\n",
|
2672 | 2da776db | Michael R. Hines | rdma->verbs, verbs); |
2673 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2674 | 2da776db | Michael R. Hines | } |
2675 | 2da776db | Michael R. Hines | |
2676 | 2da776db | Michael R. Hines | qemu_rdma_dump_id("dest_init", verbs);
|
2677 | 2da776db | Michael R. Hines | |
2678 | 2da776db | Michael R. Hines | ret = qemu_rdma_alloc_pd_cq(rdma); |
2679 | 2da776db | Michael R. Hines | if (ret) {
|
2680 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: error allocating pd and cq!\n");
|
2681 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2682 | 2da776db | Michael R. Hines | } |
2683 | 2da776db | Michael R. Hines | |
2684 | 2da776db | Michael R. Hines | ret = qemu_rdma_alloc_qp(rdma); |
2685 | 2da776db | Michael R. Hines | if (ret) {
|
2686 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: error allocating qp!\n");
|
2687 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2688 | 2da776db | Michael R. Hines | } |
2689 | 2da776db | Michael R. Hines | |
2690 | 2da776db | Michael R. Hines | ret = qemu_rdma_init_ram_blocks(rdma); |
2691 | 2da776db | Michael R. Hines | if (ret) {
|
2692 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: error initializing ram blocks!\n");
|
2693 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2694 | 2da776db | Michael R. Hines | } |
2695 | 2da776db | Michael R. Hines | |
2696 | 2da776db | Michael R. Hines | for (idx = 0; idx <= RDMA_WRID_MAX; idx++) { |
2697 | 2da776db | Michael R. Hines | ret = qemu_rdma_reg_control(rdma, idx); |
2698 | 2da776db | Michael R. Hines | if (ret) {
|
2699 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma: error registering %d control!\n", idx);
|
2700 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2701 | 2da776db | Michael R. Hines | } |
2702 | 2da776db | Michael R. Hines | } |
2703 | 2da776db | Michael R. Hines | |
2704 | 2da776db | Michael R. Hines | qemu_set_fd_handler2(rdma->channel->fd, NULL, NULL, NULL, NULL); |
2705 | 2da776db | Michael R. Hines | |
2706 | 2da776db | Michael R. Hines | ret = rdma_accept(rdma->cm_id, &conn_param); |
2707 | 2da776db | Michael R. Hines | if (ret) {
|
2708 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma_accept returns %d!\n", ret);
|
2709 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2710 | 2da776db | Michael R. Hines | } |
2711 | 2da776db | Michael R. Hines | |
2712 | 2da776db | Michael R. Hines | ret = rdma_get_cm_event(rdma->channel, &cm_event); |
2713 | 2da776db | Michael R. Hines | if (ret) {
|
2714 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma_accept get_cm_event failed %d!\n", ret);
|
2715 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2716 | 2da776db | Michael R. Hines | } |
2717 | 2da776db | Michael R. Hines | |
2718 | 2da776db | Michael R. Hines | if (cm_event->event != RDMA_CM_EVENT_ESTABLISHED) {
|
2719 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma_accept not event established!\n");
|
2720 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
2721 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2722 | 2da776db | Michael R. Hines | } |
2723 | 2da776db | Michael R. Hines | |
2724 | 2da776db | Michael R. Hines | rdma_ack_cm_event(cm_event); |
2725 | 2da776db | Michael R. Hines | |
2726 | 2da776db | Michael R. Hines | ret = qemu_rdma_post_recv_control(rdma, 0);
|
2727 | 2da776db | Michael R. Hines | if (ret) {
|
2728 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: error posting second control recv!\n");
|
2729 | 2da776db | Michael R. Hines | goto err_rdma_dest_wait;
|
2730 | 2da776db | Michael R. Hines | } |
2731 | 2da776db | Michael R. Hines | |
2732 | 2da776db | Michael R. Hines | qemu_rdma_dump_gid("dest_connect", rdma->cm_id);
|
2733 | 2da776db | Michael R. Hines | |
2734 | 2da776db | Michael R. Hines | return 0; |
2735 | 2da776db | Michael R. Hines | |
2736 | 2da776db | Michael R. Hines | err_rdma_dest_wait:
|
2737 | 2da776db | Michael R. Hines | rdma->error_state = ret; |
2738 | 2da776db | Michael R. Hines | qemu_rdma_cleanup(rdma); |
2739 | 2da776db | Michael R. Hines | return ret;
|
2740 | 2da776db | Michael R. Hines | } |
2741 | 2da776db | Michael R. Hines | |
2742 | 2da776db | Michael R. Hines | /*
|
2743 | 2da776db | Michael R. Hines | * During each iteration of the migration, we listen for instructions
|
2744 | 2da776db | Michael R. Hines | * by the source VM to perform dynamic page registrations before they
|
2745 | 2da776db | Michael R. Hines | * can perform RDMA operations.
|
2746 | 2da776db | Michael R. Hines | *
|
2747 | 2da776db | Michael R. Hines | * We respond with the 'rkey'.
|
2748 | 2da776db | Michael R. Hines | *
|
2749 | 2da776db | Michael R. Hines | * Keep doing this until the source tells us to stop.
|
2750 | 2da776db | Michael R. Hines | */
|
2751 | 2da776db | Michael R. Hines | static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque, |
2752 | 2da776db | Michael R. Hines | uint64_t flags) |
2753 | 2da776db | Michael R. Hines | { |
2754 | 2da776db | Michael R. Hines | RDMAControlHeader reg_resp = { .len = sizeof(RDMARegisterResult),
|
2755 | 2da776db | Michael R. Hines | .type = RDMA_CONTROL_REGISTER_RESULT, |
2756 | 2da776db | Michael R. Hines | .repeat = 0,
|
2757 | 2da776db | Michael R. Hines | }; |
2758 | 2da776db | Michael R. Hines | RDMAControlHeader unreg_resp = { .len = 0,
|
2759 | 2da776db | Michael R. Hines | .type = RDMA_CONTROL_UNREGISTER_FINISHED, |
2760 | 2da776db | Michael R. Hines | .repeat = 0,
|
2761 | 2da776db | Michael R. Hines | }; |
2762 | 2da776db | Michael R. Hines | RDMAControlHeader blocks = { .type = RDMA_CONTROL_RAM_BLOCKS_RESULT, |
2763 | 2da776db | Michael R. Hines | .repeat = 1 };
|
2764 | 2da776db | Michael R. Hines | QEMUFileRDMA *rfile = opaque; |
2765 | 2da776db | Michael R. Hines | RDMAContext *rdma = rfile->rdma; |
2766 | 2da776db | Michael R. Hines | RDMALocalBlocks *local = &rdma->local_ram_blocks; |
2767 | 2da776db | Michael R. Hines | RDMAControlHeader head; |
2768 | 2da776db | Michael R. Hines | RDMARegister *reg, *registers; |
2769 | 2da776db | Michael R. Hines | RDMACompress *comp; |
2770 | 2da776db | Michael R. Hines | RDMARegisterResult *reg_result; |
2771 | 2da776db | Michael R. Hines | static RDMARegisterResult results[RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE];
|
2772 | 2da776db | Michael R. Hines | RDMALocalBlock *block; |
2773 | 2da776db | Michael R. Hines | void *host_addr;
|
2774 | 2da776db | Michael R. Hines | int ret = 0; |
2775 | 2da776db | Michael R. Hines | int idx = 0; |
2776 | 2da776db | Michael R. Hines | int count = 0; |
2777 | 2da776db | Michael R. Hines | int i = 0; |
2778 | 2da776db | Michael R. Hines | |
2779 | 2da776db | Michael R. Hines | CHECK_ERROR_STATE(); |
2780 | 2da776db | Michael R. Hines | |
2781 | 2da776db | Michael R. Hines | do {
|
2782 | 2da776db | Michael R. Hines | DDDPRINTF("Waiting for next request %" PRIu64 "...\n", flags); |
2783 | 2da776db | Michael R. Hines | |
2784 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_recv(rdma, &head, RDMA_CONTROL_NONE); |
2785 | 2da776db | Michael R. Hines | |
2786 | 2da776db | Michael R. Hines | if (ret < 0) { |
2787 | 2da776db | Michael R. Hines | break;
|
2788 | 2da776db | Michael R. Hines | } |
2789 | 2da776db | Michael R. Hines | |
2790 | 2da776db | Michael R. Hines | if (head.repeat > RDMA_CONTROL_MAX_COMMANDS_PER_MESSAGE) {
|
2791 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma: Too many requests in this message (%d)."
|
2792 | 2da776db | Michael R. Hines | "Bailing.\n", head.repeat);
|
2793 | 2da776db | Michael R. Hines | ret = -EIO; |
2794 | 2da776db | Michael R. Hines | break;
|
2795 | 2da776db | Michael R. Hines | } |
2796 | 2da776db | Michael R. Hines | |
2797 | 2da776db | Michael R. Hines | switch (head.type) {
|
2798 | 2da776db | Michael R. Hines | case RDMA_CONTROL_COMPRESS:
|
2799 | 2da776db | Michael R. Hines | comp = (RDMACompress *) rdma->wr_data[idx].control_curr; |
2800 | 2da776db | Michael R. Hines | network_to_compress(comp); |
2801 | 2da776db | Michael R. Hines | |
2802 | 2da776db | Michael R. Hines | DDPRINTF("Zapping zero chunk: %" PRId64
|
2803 | 2da776db | Michael R. Hines | " bytes, index %d, offset %" PRId64 "\n", |
2804 | 2da776db | Michael R. Hines | comp->length, comp->block_idx, comp->offset); |
2805 | 2da776db | Michael R. Hines | block = &(rdma->local_ram_blocks.block[comp->block_idx]); |
2806 | 2da776db | Michael R. Hines | |
2807 | 2da776db | Michael R. Hines | host_addr = block->local_host_addr + |
2808 | 2da776db | Michael R. Hines | (comp->offset - block->offset); |
2809 | 2da776db | Michael R. Hines | |
2810 | 2da776db | Michael R. Hines | ram_handle_compressed(host_addr, comp->value, comp->length); |
2811 | 2da776db | Michael R. Hines | break;
|
2812 | 2da776db | Michael R. Hines | |
2813 | 2da776db | Michael R. Hines | case RDMA_CONTROL_REGISTER_FINISHED:
|
2814 | 2da776db | Michael R. Hines | DDDPRINTF("Current registrations complete.\n");
|
2815 | 2da776db | Michael R. Hines | goto out;
|
2816 | 2da776db | Michael R. Hines | |
2817 | 2da776db | Michael R. Hines | case RDMA_CONTROL_RAM_BLOCKS_REQUEST:
|
2818 | 2da776db | Michael R. Hines | DPRINTF("Initial setup info requested.\n");
|
2819 | 2da776db | Michael R. Hines | |
2820 | 2da776db | Michael R. Hines | if (rdma->pin_all) {
|
2821 | 2da776db | Michael R. Hines | ret = qemu_rdma_reg_whole_ram_blocks(rdma); |
2822 | 2da776db | Michael R. Hines | if (ret) {
|
2823 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: error dest "
|
2824 | 2da776db | Michael R. Hines | "registering ram blocks!\n");
|
2825 | 2da776db | Michael R. Hines | goto out;
|
2826 | 2da776db | Michael R. Hines | } |
2827 | 2da776db | Michael R. Hines | } |
2828 | 2da776db | Michael R. Hines | |
2829 | 2da776db | Michael R. Hines | /*
|
2830 | 2da776db | Michael R. Hines | * Dest uses this to prepare to transmit the RAMBlock descriptions
|
2831 | 2da776db | Michael R. Hines | * to the source VM after connection setup.
|
2832 | 2da776db | Michael R. Hines | * Both sides use the "remote" structure to communicate and update
|
2833 | 2da776db | Michael R. Hines | * their "local" descriptions with what was sent.
|
2834 | 2da776db | Michael R. Hines | */
|
2835 | 2da776db | Michael R. Hines | for (i = 0; i < local->nb_blocks; i++) { |
2836 | 2da776db | Michael R. Hines | rdma->block[i].remote_host_addr = |
2837 | 2da776db | Michael R. Hines | (uint64_t)(local->block[i].local_host_addr); |
2838 | 2da776db | Michael R. Hines | |
2839 | 2da776db | Michael R. Hines | if (rdma->pin_all) {
|
2840 | 2da776db | Michael R. Hines | rdma->block[i].remote_rkey = local->block[i].mr->rkey; |
2841 | 2da776db | Michael R. Hines | } |
2842 | 2da776db | Michael R. Hines | |
2843 | 2da776db | Michael R. Hines | rdma->block[i].offset = local->block[i].offset; |
2844 | 2da776db | Michael R. Hines | rdma->block[i].length = local->block[i].length; |
2845 | 2da776db | Michael R. Hines | |
2846 | 2da776db | Michael R. Hines | remote_block_to_network(&rdma->block[i]); |
2847 | 2da776db | Michael R. Hines | } |
2848 | 2da776db | Michael R. Hines | |
2849 | 2da776db | Michael R. Hines | blocks.len = rdma->local_ram_blocks.nb_blocks |
2850 | 2da776db | Michael R. Hines | * sizeof(RDMARemoteBlock);
|
2851 | 2da776db | Michael R. Hines | |
2852 | 2da776db | Michael R. Hines | |
2853 | 2da776db | Michael R. Hines | ret = qemu_rdma_post_send_control(rdma, |
2854 | 2da776db | Michael R. Hines | (uint8_t *) rdma->block, &blocks); |
2855 | 2da776db | Michael R. Hines | |
2856 | 2da776db | Michael R. Hines | if (ret < 0) { |
2857 | 2da776db | Michael R. Hines | fprintf(stderr, "rdma migration: error sending remote info!\n");
|
2858 | 2da776db | Michael R. Hines | goto out;
|
2859 | 2da776db | Michael R. Hines | } |
2860 | 2da776db | Michael R. Hines | |
2861 | 2da776db | Michael R. Hines | break;
|
2862 | 2da776db | Michael R. Hines | case RDMA_CONTROL_REGISTER_REQUEST:
|
2863 | 2da776db | Michael R. Hines | DDPRINTF("There are %d registration requests\n", head.repeat);
|
2864 | 2da776db | Michael R. Hines | |
2865 | 2da776db | Michael R. Hines | reg_resp.repeat = head.repeat; |
2866 | 2da776db | Michael R. Hines | registers = (RDMARegister *) rdma->wr_data[idx].control_curr; |
2867 | 2da776db | Michael R. Hines | |
2868 | 2da776db | Michael R. Hines | for (count = 0; count < head.repeat; count++) { |
2869 | 2da776db | Michael R. Hines | uint64_t chunk; |
2870 | 2da776db | Michael R. Hines | uint8_t *chunk_start, *chunk_end; |
2871 | 2da776db | Michael R. Hines | |
2872 | 2da776db | Michael R. Hines | reg = ®isters[count]; |
2873 | 2da776db | Michael R. Hines | network_to_register(reg); |
2874 | 2da776db | Michael R. Hines | |
2875 | 2da776db | Michael R. Hines | reg_result = &results[count]; |
2876 | 2da776db | Michael R. Hines | |
2877 | 2da776db | Michael R. Hines | DDPRINTF("Registration request (%d): index %d, current_addr %"
|
2878 | 2da776db | Michael R. Hines | PRIu64 " chunks: %" PRIu64 "\n", count, |
2879 | 2da776db | Michael R. Hines | reg->current_index, reg->key.current_addr, reg->chunks); |
2880 | 2da776db | Michael R. Hines | |
2881 | 2da776db | Michael R. Hines | block = &(rdma->local_ram_blocks.block[reg->current_index]); |
2882 | 2da776db | Michael R. Hines | if (block->is_ram_block) {
|
2883 | 2da776db | Michael R. Hines | host_addr = (block->local_host_addr + |
2884 | 2da776db | Michael R. Hines | (reg->key.current_addr - block->offset)); |
2885 | 2da776db | Michael R. Hines | chunk = ram_chunk_index(block->local_host_addr, |
2886 | 2da776db | Michael R. Hines | (uint8_t *) host_addr); |
2887 | 2da776db | Michael R. Hines | } else {
|
2888 | 2da776db | Michael R. Hines | chunk = reg->key.chunk; |
2889 | 2da776db | Michael R. Hines | host_addr = block->local_host_addr + |
2890 | 2da776db | Michael R. Hines | (reg->key.chunk * (1UL << RDMA_REG_CHUNK_SHIFT));
|
2891 | 2da776db | Michael R. Hines | } |
2892 | 2da776db | Michael R. Hines | chunk_start = ram_chunk_start(block, chunk); |
2893 | 2da776db | Michael R. Hines | chunk_end = ram_chunk_end(block, chunk + reg->chunks); |
2894 | 2da776db | Michael R. Hines | if (qemu_rdma_register_and_get_keys(rdma, block,
|
2895 | 2da776db | Michael R. Hines | (uint8_t *)host_addr, NULL, ®_result->rkey,
|
2896 | 2da776db | Michael R. Hines | chunk, chunk_start, chunk_end)) { |
2897 | 2da776db | Michael R. Hines | fprintf(stderr, "cannot get rkey!\n");
|
2898 | 2da776db | Michael R. Hines | ret = -EINVAL; |
2899 | 2da776db | Michael R. Hines | goto out;
|
2900 | 2da776db | Michael R. Hines | } |
2901 | 2da776db | Michael R. Hines | |
2902 | 2da776db | Michael R. Hines | reg_result->host_addr = (uint64_t) block->local_host_addr; |
2903 | 2da776db | Michael R. Hines | |
2904 | 2da776db | Michael R. Hines | DDPRINTF("Registered rkey for this request: %x\n",
|
2905 | 2da776db | Michael R. Hines | reg_result->rkey); |
2906 | 2da776db | Michael R. Hines | |
2907 | 2da776db | Michael R. Hines | result_to_network(reg_result); |
2908 | 2da776db | Michael R. Hines | } |
2909 | 2da776db | Michael R. Hines | |
2910 | 2da776db | Michael R. Hines | ret = qemu_rdma_post_send_control(rdma, |
2911 | 2da776db | Michael R. Hines | (uint8_t *) results, ®_resp); |
2912 | 2da776db | Michael R. Hines | |
2913 | 2da776db | Michael R. Hines | if (ret < 0) { |
2914 | 2da776db | Michael R. Hines | fprintf(stderr, "Failed to send control buffer!\n");
|
2915 | 2da776db | Michael R. Hines | goto out;
|
2916 | 2da776db | Michael R. Hines | } |
2917 | 2da776db | Michael R. Hines | break;
|
2918 | 2da776db | Michael R. Hines | case RDMA_CONTROL_UNREGISTER_REQUEST:
|
2919 | 2da776db | Michael R. Hines | DDPRINTF("There are %d unregistration requests\n", head.repeat);
|
2920 | 2da776db | Michael R. Hines | unreg_resp.repeat = head.repeat; |
2921 | 2da776db | Michael R. Hines | registers = (RDMARegister *) rdma->wr_data[idx].control_curr; |
2922 | 2da776db | Michael R. Hines | |
2923 | 2da776db | Michael R. Hines | for (count = 0; count < head.repeat; count++) { |
2924 | 2da776db | Michael R. Hines | reg = ®isters[count]; |
2925 | 2da776db | Michael R. Hines | network_to_register(reg); |
2926 | 2da776db | Michael R. Hines | |
2927 | 2da776db | Michael R. Hines | DDPRINTF("Unregistration request (%d): "
|
2928 | 2da776db | Michael R. Hines | " index %d, chunk %" PRIu64 "\n", |
2929 | 2da776db | Michael R. Hines | count, reg->current_index, reg->key.chunk); |
2930 | 2da776db | Michael R. Hines | |
2931 | 2da776db | Michael R. Hines | block = &(rdma->local_ram_blocks.block[reg->current_index]); |
2932 | 2da776db | Michael R. Hines | |
2933 | 2da776db | Michael R. Hines | ret = ibv_dereg_mr(block->pmr[reg->key.chunk]); |
2934 | 2da776db | Michael R. Hines | block->pmr[reg->key.chunk] = NULL;
|
2935 | 2da776db | Michael R. Hines | |
2936 | 2da776db | Michael R. Hines | if (ret != 0) { |
2937 | 2da776db | Michael R. Hines | perror("rdma unregistration chunk failed");
|
2938 | 2da776db | Michael R. Hines | ret = -ret; |
2939 | 2da776db | Michael R. Hines | goto out;
|
2940 | 2da776db | Michael R. Hines | } |
2941 | 2da776db | Michael R. Hines | |
2942 | 2da776db | Michael R. Hines | rdma->total_registrations--; |
2943 | 2da776db | Michael R. Hines | |
2944 | 2da776db | Michael R. Hines | DDPRINTF("Unregistered chunk %" PRIu64 " successfully.\n", |
2945 | 2da776db | Michael R. Hines | reg->key.chunk); |
2946 | 2da776db | Michael R. Hines | } |
2947 | 2da776db | Michael R. Hines | |
2948 | 2da776db | Michael R. Hines | ret = qemu_rdma_post_send_control(rdma, NULL, &unreg_resp);
|
2949 | 2da776db | Michael R. Hines | |
2950 | 2da776db | Michael R. Hines | if (ret < 0) { |
2951 | 2da776db | Michael R. Hines | fprintf(stderr, "Failed to send control buffer!\n");
|
2952 | 2da776db | Michael R. Hines | goto out;
|
2953 | 2da776db | Michael R. Hines | } |
2954 | 2da776db | Michael R. Hines | break;
|
2955 | 2da776db | Michael R. Hines | case RDMA_CONTROL_REGISTER_RESULT:
|
2956 | 2da776db | Michael R. Hines | fprintf(stderr, "Invalid RESULT message at dest.\n");
|
2957 | 2da776db | Michael R. Hines | ret = -EIO; |
2958 | 2da776db | Michael R. Hines | goto out;
|
2959 | 2da776db | Michael R. Hines | default:
|
2960 | 2da776db | Michael R. Hines | fprintf(stderr, "Unknown control message %s\n",
|
2961 | 2da776db | Michael R. Hines | control_desc[head.type]); |
2962 | 2da776db | Michael R. Hines | ret = -EIO; |
2963 | 2da776db | Michael R. Hines | goto out;
|
2964 | 2da776db | Michael R. Hines | } |
2965 | 2da776db | Michael R. Hines | } while (1); |
2966 | 2da776db | Michael R. Hines | out:
|
2967 | 2da776db | Michael R. Hines | if (ret < 0) { |
2968 | 2da776db | Michael R. Hines | rdma->error_state = ret; |
2969 | 2da776db | Michael R. Hines | } |
2970 | 2da776db | Michael R. Hines | return ret;
|
2971 | 2da776db | Michael R. Hines | } |
2972 | 2da776db | Michael R. Hines | |
2973 | 2da776db | Michael R. Hines | static int qemu_rdma_registration_start(QEMUFile *f, void *opaque, |
2974 | 2da776db | Michael R. Hines | uint64_t flags) |
2975 | 2da776db | Michael R. Hines | { |
2976 | 2da776db | Michael R. Hines | QEMUFileRDMA *rfile = opaque; |
2977 | 2da776db | Michael R. Hines | RDMAContext *rdma = rfile->rdma; |
2978 | 2da776db | Michael R. Hines | |
2979 | 2da776db | Michael R. Hines | CHECK_ERROR_STATE(); |
2980 | 2da776db | Michael R. Hines | |
2981 | 2da776db | Michael R. Hines | DDDPRINTF("start section: %" PRIu64 "\n", flags); |
2982 | 2da776db | Michael R. Hines | qemu_put_be64(f, RAM_SAVE_FLAG_HOOK); |
2983 | 2da776db | Michael R. Hines | qemu_fflush(f); |
2984 | 2da776db | Michael R. Hines | |
2985 | 2da776db | Michael R. Hines | return 0; |
2986 | 2da776db | Michael R. Hines | } |
2987 | 2da776db | Michael R. Hines | |
2988 | 2da776db | Michael R. Hines | /*
|
2989 | 2da776db | Michael R. Hines | * Inform dest that dynamic registrations are done for now.
|
2990 | 2da776db | Michael R. Hines | * First, flush writes, if any.
|
2991 | 2da776db | Michael R. Hines | */
|
2992 | 2da776db | Michael R. Hines | static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, |
2993 | 2da776db | Michael R. Hines | uint64_t flags) |
2994 | 2da776db | Michael R. Hines | { |
2995 | 2da776db | Michael R. Hines | Error *local_err = NULL, **errp = &local_err;
|
2996 | 2da776db | Michael R. Hines | QEMUFileRDMA *rfile = opaque; |
2997 | 2da776db | Michael R. Hines | RDMAContext *rdma = rfile->rdma; |
2998 | 2da776db | Michael R. Hines | RDMAControlHeader head = { .len = 0, .repeat = 1 }; |
2999 | 2da776db | Michael R. Hines | int ret = 0; |
3000 | 2da776db | Michael R. Hines | |
3001 | 2da776db | Michael R. Hines | CHECK_ERROR_STATE(); |
3002 | 2da776db | Michael R. Hines | |
3003 | 2da776db | Michael R. Hines | qemu_fflush(f); |
3004 | 2da776db | Michael R. Hines | ret = qemu_rdma_drain_cq(f, rdma); |
3005 | 2da776db | Michael R. Hines | |
3006 | 2da776db | Michael R. Hines | if (ret < 0) { |
3007 | 2da776db | Michael R. Hines | goto err;
|
3008 | 2da776db | Michael R. Hines | } |
3009 | 2da776db | Michael R. Hines | |
3010 | 2da776db | Michael R. Hines | if (flags == RAM_CONTROL_SETUP) {
|
3011 | 2da776db | Michael R. Hines | RDMAControlHeader resp = {.type = RDMA_CONTROL_RAM_BLOCKS_RESULT }; |
3012 | 2da776db | Michael R. Hines | RDMALocalBlocks *local = &rdma->local_ram_blocks; |
3013 | 2da776db | Michael R. Hines | int reg_result_idx, i, j, nb_remote_blocks;
|
3014 | 2da776db | Michael R. Hines | |
3015 | 2da776db | Michael R. Hines | head.type = RDMA_CONTROL_RAM_BLOCKS_REQUEST; |
3016 | 2da776db | Michael R. Hines | DPRINTF("Sending registration setup for ram blocks...\n");
|
3017 | 2da776db | Michael R. Hines | |
3018 | 2da776db | Michael R. Hines | /*
|
3019 | 2da776db | Michael R. Hines | * Make sure that we parallelize the pinning on both sides.
|
3020 | 2da776db | Michael R. Hines | * For very large guests, doing this serially takes a really
|
3021 | 2da776db | Michael R. Hines | * long time, so we have to 'interleave' the pinning locally
|
3022 | 2da776db | Michael R. Hines | * with the control messages by performing the pinning on this
|
3023 | 2da776db | Michael R. Hines | * side before we receive the control response from the other
|
3024 | 2da776db | Michael R. Hines | * side that the pinning has completed.
|
3025 | 2da776db | Michael R. Hines | */
|
3026 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_send(rdma, &head, NULL, &resp,
|
3027 | 2da776db | Michael R. Hines | ®_result_idx, rdma->pin_all ? |
3028 | 2da776db | Michael R. Hines | qemu_rdma_reg_whole_ram_blocks : NULL);
|
3029 | 2da776db | Michael R. Hines | if (ret < 0) { |
3030 | 2da776db | Michael R. Hines | ERROR(errp, "receiving remote info!\n");
|
3031 | 2da776db | Michael R. Hines | return ret;
|
3032 | 2da776db | Michael R. Hines | } |
3033 | 2da776db | Michael R. Hines | |
3034 | 2da776db | Michael R. Hines | qemu_rdma_move_header(rdma, reg_result_idx, &resp); |
3035 | 2da776db | Michael R. Hines | memcpy(rdma->block, |
3036 | 2da776db | Michael R. Hines | rdma->wr_data[reg_result_idx].control_curr, resp.len); |
3037 | 2da776db | Michael R. Hines | |
3038 | 2da776db | Michael R. Hines | nb_remote_blocks = resp.len / sizeof(RDMARemoteBlock);
|
3039 | 2da776db | Michael R. Hines | |
3040 | 2da776db | Michael R. Hines | /*
|
3041 | 2da776db | Michael R. Hines | * The protocol uses two different sets of rkeys (mutually exclusive):
|
3042 | 2da776db | Michael R. Hines | * 1. One key to represent the virtual address of the entire ram block.
|
3043 | 2da776db | Michael R. Hines | * (dynamic chunk registration disabled - pin everything with one rkey.)
|
3044 | 2da776db | Michael R. Hines | * 2. One to represent individual chunks within a ram block.
|
3045 | 2da776db | Michael R. Hines | * (dynamic chunk registration enabled - pin individual chunks.)
|
3046 | 2da776db | Michael R. Hines | *
|
3047 | 2da776db | Michael R. Hines | * Once the capability is successfully negotiated, the destination transmits
|
3048 | 2da776db | Michael R. Hines | * the keys to use (or sends them later) including the virtual addresses
|
3049 | 2da776db | Michael R. Hines | * and then propagates the remote ram block descriptions to his local copy.
|
3050 | 2da776db | Michael R. Hines | */
|
3051 | 2da776db | Michael R. Hines | |
3052 | 2da776db | Michael R. Hines | if (local->nb_blocks != nb_remote_blocks) {
|
3053 | 2da776db | Michael R. Hines | ERROR(errp, "ram blocks mismatch #1! "
|
3054 | 2da776db | Michael R. Hines | "Your QEMU command line parameters are probably "
|
3055 | 2da776db | Michael R. Hines | "not identical on both the source and destination.\n");
|
3056 | 2da776db | Michael R. Hines | return -EINVAL;
|
3057 | 2da776db | Michael R. Hines | } |
3058 | 2da776db | Michael R. Hines | |
3059 | 2da776db | Michael R. Hines | for (i = 0; i < nb_remote_blocks; i++) { |
3060 | 2da776db | Michael R. Hines | network_to_remote_block(&rdma->block[i]); |
3061 | 2da776db | Michael R. Hines | |
3062 | 2da776db | Michael R. Hines | /* search local ram blocks */
|
3063 | 2da776db | Michael R. Hines | for (j = 0; j < local->nb_blocks; j++) { |
3064 | 2da776db | Michael R. Hines | if (rdma->block[i].offset != local->block[j].offset) {
|
3065 | 2da776db | Michael R. Hines | continue;
|
3066 | 2da776db | Michael R. Hines | } |
3067 | 2da776db | Michael R. Hines | |
3068 | 2da776db | Michael R. Hines | if (rdma->block[i].length != local->block[j].length) {
|
3069 | 2da776db | Michael R. Hines | ERROR(errp, "ram blocks mismatch #2! "
|
3070 | 2da776db | Michael R. Hines | "Your QEMU command line parameters are probably "
|
3071 | 2da776db | Michael R. Hines | "not identical on both the source and destination.\n");
|
3072 | 2da776db | Michael R. Hines | return -EINVAL;
|
3073 | 2da776db | Michael R. Hines | } |
3074 | 2da776db | Michael R. Hines | local->block[j].remote_host_addr = |
3075 | 2da776db | Michael R. Hines | rdma->block[i].remote_host_addr; |
3076 | 2da776db | Michael R. Hines | local->block[j].remote_rkey = rdma->block[i].remote_rkey; |
3077 | 2da776db | Michael R. Hines | break;
|
3078 | 2da776db | Michael R. Hines | } |
3079 | 2da776db | Michael R. Hines | |
3080 | 2da776db | Michael R. Hines | if (j >= local->nb_blocks) {
|
3081 | 2da776db | Michael R. Hines | ERROR(errp, "ram blocks mismatch #3! "
|
3082 | 2da776db | Michael R. Hines | "Your QEMU command line parameters are probably "
|
3083 | 2da776db | Michael R. Hines | "not identical on both the source and destination.\n");
|
3084 | 2da776db | Michael R. Hines | return -EINVAL;
|
3085 | 2da776db | Michael R. Hines | } |
3086 | 2da776db | Michael R. Hines | } |
3087 | 2da776db | Michael R. Hines | } |
3088 | 2da776db | Michael R. Hines | |
3089 | 2da776db | Michael R. Hines | DDDPRINTF("Sending registration finish %" PRIu64 "...\n", flags); |
3090 | 2da776db | Michael R. Hines | |
3091 | 2da776db | Michael R. Hines | head.type = RDMA_CONTROL_REGISTER_FINISHED; |
3092 | 2da776db | Michael R. Hines | ret = qemu_rdma_exchange_send(rdma, &head, NULL, NULL, NULL, NULL); |
3093 | 2da776db | Michael R. Hines | |
3094 | 2da776db | Michael R. Hines | if (ret < 0) { |
3095 | 2da776db | Michael R. Hines | goto err;
|
3096 | 2da776db | Michael R. Hines | } |
3097 | 2da776db | Michael R. Hines | |
3098 | 2da776db | Michael R. Hines | return 0; |
3099 | 2da776db | Michael R. Hines | err:
|
3100 | 2da776db | Michael R. Hines | rdma->error_state = ret; |
3101 | 2da776db | Michael R. Hines | return ret;
|
3102 | 2da776db | Michael R. Hines | } |
3103 | 2da776db | Michael R. Hines | |
3104 | 2da776db | Michael R. Hines | static int qemu_rdma_get_fd(void *opaque) |
3105 | 2da776db | Michael R. Hines | { |
3106 | 2da776db | Michael R. Hines | QEMUFileRDMA *rfile = opaque; |
3107 | 2da776db | Michael R. Hines | RDMAContext *rdma = rfile->rdma; |
3108 | 2da776db | Michael R. Hines | |
3109 | 2da776db | Michael R. Hines | return rdma->comp_channel->fd;
|
3110 | 2da776db | Michael R. Hines | } |
3111 | 2da776db | Michael R. Hines | |
3112 | 2da776db | Michael R. Hines | const QEMUFileOps rdma_read_ops = {
|
3113 | 2da776db | Michael R. Hines | .get_buffer = qemu_rdma_get_buffer, |
3114 | 2da776db | Michael R. Hines | .get_fd = qemu_rdma_get_fd, |
3115 | 2da776db | Michael R. Hines | .close = qemu_rdma_close, |
3116 | 2da776db | Michael R. Hines | .hook_ram_load = qemu_rdma_registration_handle, |
3117 | 2da776db | Michael R. Hines | }; |
3118 | 2da776db | Michael R. Hines | |
3119 | 2da776db | Michael R. Hines | const QEMUFileOps rdma_write_ops = {
|
3120 | 2da776db | Michael R. Hines | .put_buffer = qemu_rdma_put_buffer, |
3121 | 2da776db | Michael R. Hines | .close = qemu_rdma_close, |
3122 | 2da776db | Michael R. Hines | .before_ram_iterate = qemu_rdma_registration_start, |
3123 | 2da776db | Michael R. Hines | .after_ram_iterate = qemu_rdma_registration_stop, |
3124 | 2da776db | Michael R. Hines | .save_page = qemu_rdma_save_page, |
3125 | 2da776db | Michael R. Hines | }; |
3126 | 2da776db | Michael R. Hines | |
3127 | 2da776db | Michael R. Hines | static void *qemu_fopen_rdma(RDMAContext *rdma, const char *mode) |
3128 | 2da776db | Michael R. Hines | { |
3129 | 2da776db | Michael R. Hines | QEMUFileRDMA *r = g_malloc0(sizeof(QEMUFileRDMA));
|
3130 | 2da776db | Michael R. Hines | |
3131 | 2da776db | Michael R. Hines | if (qemu_file_mode_is_not_valid(mode)) {
|
3132 | 2da776db | Michael R. Hines | return NULL; |
3133 | 2da776db | Michael R. Hines | } |
3134 | 2da776db | Michael R. Hines | |
3135 | 2da776db | Michael R. Hines | r->rdma = rdma; |
3136 | 2da776db | Michael R. Hines | |
3137 | 2da776db | Michael R. Hines | if (mode[0] == 'w') { |
3138 | 2da776db | Michael R. Hines | r->file = qemu_fopen_ops(r, &rdma_write_ops); |
3139 | 2da776db | Michael R. Hines | } else {
|
3140 | 2da776db | Michael R. Hines | r->file = qemu_fopen_ops(r, &rdma_read_ops); |
3141 | 2da776db | Michael R. Hines | } |
3142 | 2da776db | Michael R. Hines | |
3143 | 2da776db | Michael R. Hines | return r->file;
|
3144 | 2da776db | Michael R. Hines | } |
3145 | 2da776db | Michael R. Hines | |
3146 | 2da776db | Michael R. Hines | static void rdma_accept_incoming_migration(void *opaque) |
3147 | 2da776db | Michael R. Hines | { |
3148 | 2da776db | Michael R. Hines | RDMAContext *rdma = opaque; |
3149 | 2da776db | Michael R. Hines | int ret;
|
3150 | 2da776db | Michael R. Hines | QEMUFile *f; |
3151 | 2da776db | Michael R. Hines | Error *local_err = NULL, **errp = &local_err;
|
3152 | 2da776db | Michael R. Hines | |
3153 | 2da776db | Michael R. Hines | DPRINTF("Accepting rdma connection...\n");
|
3154 | 2da776db | Michael R. Hines | ret = qemu_rdma_accept(rdma); |
3155 | 2da776db | Michael R. Hines | |
3156 | 2da776db | Michael R. Hines | if (ret) {
|
3157 | 2da776db | Michael R. Hines | ERROR(errp, "RDMA Migration initialization failed!\n");
|
3158 | 2da776db | Michael R. Hines | return;
|
3159 | 2da776db | Michael R. Hines | } |
3160 | 2da776db | Michael R. Hines | |
3161 | 2da776db | Michael R. Hines | DPRINTF("Accepted migration\n");
|
3162 | 2da776db | Michael R. Hines | |
3163 | 2da776db | Michael R. Hines | f = qemu_fopen_rdma(rdma, "rb");
|
3164 | 2da776db | Michael R. Hines | if (f == NULL) { |
3165 | 2da776db | Michael R. Hines | ERROR(errp, "could not qemu_fopen_rdma!\n");
|
3166 | 2da776db | Michael R. Hines | qemu_rdma_cleanup(rdma); |
3167 | 2da776db | Michael R. Hines | return;
|
3168 | 2da776db | Michael R. Hines | } |
3169 | 2da776db | Michael R. Hines | |
3170 | 2da776db | Michael R. Hines | rdma->migration_started_on_destination = 1;
|
3171 | 2da776db | Michael R. Hines | process_incoming_migration(f); |
3172 | 2da776db | Michael R. Hines | } |
3173 | 2da776db | Michael R. Hines | |
3174 | 2da776db | Michael R. Hines | void rdma_start_incoming_migration(const char *host_port, Error **errp) |
3175 | 2da776db | Michael R. Hines | { |
3176 | 2da776db | Michael R. Hines | int ret;
|
3177 | 2da776db | Michael R. Hines | RDMAContext *rdma; |
3178 | 2da776db | Michael R. Hines | Error *local_err = NULL;
|
3179 | 2da776db | Michael R. Hines | |
3180 | 2da776db | Michael R. Hines | DPRINTF("Starting RDMA-based incoming migration\n");
|
3181 | 2da776db | Michael R. Hines | rdma = qemu_rdma_data_init(host_port, &local_err); |
3182 | 2da776db | Michael R. Hines | |
3183 | 2da776db | Michael R. Hines | if (rdma == NULL) { |
3184 | 2da776db | Michael R. Hines | goto err;
|
3185 | 2da776db | Michael R. Hines | } |
3186 | 2da776db | Michael R. Hines | |
3187 | 2da776db | Michael R. Hines | ret = qemu_rdma_dest_init(rdma, &local_err); |
3188 | 2da776db | Michael R. Hines | |
3189 | 2da776db | Michael R. Hines | if (ret) {
|
3190 | 2da776db | Michael R. Hines | goto err;
|
3191 | 2da776db | Michael R. Hines | } |
3192 | 2da776db | Michael R. Hines | |
3193 | 2da776db | Michael R. Hines | DPRINTF("qemu_rdma_dest_init success\n");
|
3194 | 2da776db | Michael R. Hines | |
3195 | 2da776db | Michael R. Hines | ret = rdma_listen(rdma->listen_id, 5);
|
3196 | 2da776db | Michael R. Hines | |
3197 | 2da776db | Michael R. Hines | if (ret) {
|
3198 | 2da776db | Michael R. Hines | ERROR(errp, "listening on socket!\n");
|
3199 | 2da776db | Michael R. Hines | goto err;
|
3200 | 2da776db | Michael R. Hines | } |
3201 | 2da776db | Michael R. Hines | |
3202 | 2da776db | Michael R. Hines | DPRINTF("rdma_listen success\n");
|
3203 | 2da776db | Michael R. Hines | |
3204 | 2da776db | Michael R. Hines | qemu_set_fd_handler2(rdma->channel->fd, NULL,
|
3205 | 2da776db | Michael R. Hines | rdma_accept_incoming_migration, NULL,
|
3206 | 2da776db | Michael R. Hines | (void *)(intptr_t) rdma);
|
3207 | 2da776db | Michael R. Hines | return;
|
3208 | 2da776db | Michael R. Hines | err:
|
3209 | 2da776db | Michael R. Hines | error_propagate(errp, local_err); |
3210 | 2da776db | Michael R. Hines | g_free(rdma); |
3211 | 2da776db | Michael R. Hines | } |
3212 | 2da776db | Michael R. Hines | |
3213 | 2da776db | Michael R. Hines | void rdma_start_outgoing_migration(void *opaque, |
3214 | 2da776db | Michael R. Hines | const char *host_port, Error **errp) |
3215 | 2da776db | Michael R. Hines | { |
3216 | 2da776db | Michael R. Hines | MigrationState *s = opaque; |
3217 | 2da776db | Michael R. Hines | Error *local_err = NULL, **temp = &local_err;
|
3218 | 2da776db | Michael R. Hines | RDMAContext *rdma = qemu_rdma_data_init(host_port, &local_err); |
3219 | 2da776db | Michael R. Hines | int ret = 0; |
3220 | 2da776db | Michael R. Hines | |
3221 | 2da776db | Michael R. Hines | if (rdma == NULL) { |
3222 | 2da776db | Michael R. Hines | ERROR(temp, "Failed to initialize RDMA data structures! %d\n", ret);
|
3223 | 2da776db | Michael R. Hines | goto err;
|
3224 | 2da776db | Michael R. Hines | } |
3225 | 2da776db | Michael R. Hines | |
3226 | 2da776db | Michael R. Hines | ret = qemu_rdma_source_init(rdma, &local_err, |
3227 | 2da776db | Michael R. Hines | s->enabled_capabilities[MIGRATION_CAPABILITY_X_RDMA_PIN_ALL]); |
3228 | 2da776db | Michael R. Hines | |
3229 | 2da776db | Michael R. Hines | if (ret) {
|
3230 | 2da776db | Michael R. Hines | goto err;
|
3231 | 2da776db | Michael R. Hines | } |
3232 | 2da776db | Michael R. Hines | |
3233 | 2da776db | Michael R. Hines | DPRINTF("qemu_rdma_source_init success\n");
|
3234 | 2da776db | Michael R. Hines | ret = qemu_rdma_connect(rdma, &local_err); |
3235 | 2da776db | Michael R. Hines | |
3236 | 2da776db | Michael R. Hines | if (ret) {
|
3237 | 2da776db | Michael R. Hines | goto err;
|
3238 | 2da776db | Michael R. Hines | } |
3239 | 2da776db | Michael R. Hines | |
3240 | 2da776db | Michael R. Hines | DPRINTF("qemu_rdma_source_connect success\n");
|
3241 | 2da776db | Michael R. Hines | |
3242 | 2da776db | Michael R. Hines | s->file = qemu_fopen_rdma(rdma, "wb");
|
3243 | 2da776db | Michael R. Hines | migrate_fd_connect(s); |
3244 | 2da776db | Michael R. Hines | return;
|
3245 | 2da776db | Michael R. Hines | err:
|
3246 | 2da776db | Michael R. Hines | error_propagate(errp, local_err); |
3247 | 2da776db | Michael R. Hines | g_free(rdma); |
3248 | 2da776db | Michael R. Hines | migrate_fd_error(s); |
3249 | 2da776db | Michael R. Hines | } |