root / hw / virtio-net.c @ 0d09e41a
History | View | Annotate | Download (39.9 kB)
| 1 |
/*
|
|---|---|
| 2 |
* Virtio Network Device
|
| 3 |
*
|
| 4 |
* Copyright IBM, Corp. 2007
|
| 5 |
*
|
| 6 |
* Authors:
|
| 7 |
* Anthony Liguori <aliguori@us.ibm.com>
|
| 8 |
*
|
| 9 |
* This work is licensed under the terms of the GNU GPL, version 2. See
|
| 10 |
* the COPYING file in the top-level directory.
|
| 11 |
*
|
| 12 |
*/
|
| 13 |
|
| 14 |
#include "qemu/iov.h" |
| 15 |
#include "hw/virtio/virtio.h" |
| 16 |
#include "net/net.h" |
| 17 |
#include "net/checksum.h" |
| 18 |
#include "net/tap.h" |
| 19 |
#include "qemu/error-report.h" |
| 20 |
#include "qemu/timer.h" |
| 21 |
#include "hw/virtio/virtio-net.h" |
| 22 |
#include "net/vhost_net.h" |
| 23 |
|
| 24 |
#define VIRTIO_NET_VM_VERSION 11 |
| 25 |
|
| 26 |
#define MAC_TABLE_ENTRIES 64 |
| 27 |
#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ |
| 28 |
|
| 29 |
/*
|
| 30 |
* Calculate the number of bytes up to and including the given 'field' of
|
| 31 |
* 'container'.
|
| 32 |
*/
|
| 33 |
#define endof(container, field) \
|
| 34 |
(offsetof(container, field) + sizeof(((container *)0)->field)) |
| 35 |
|
| 36 |
typedef struct VirtIOFeature { |
| 37 |
uint32_t flags; |
| 38 |
size_t end; |
| 39 |
} VirtIOFeature; |
| 40 |
|
| 41 |
static VirtIOFeature feature_sizes[] = {
|
| 42 |
{.flags = 1 << VIRTIO_NET_F_MAC,
|
| 43 |
.end = endof(struct virtio_net_config, mac)},
|
| 44 |
{.flags = 1 << VIRTIO_NET_F_STATUS,
|
| 45 |
.end = endof(struct virtio_net_config, status)},
|
| 46 |
{.flags = 1 << VIRTIO_NET_F_MQ,
|
| 47 |
.end = endof(struct virtio_net_config, max_virtqueue_pairs)},
|
| 48 |
{}
|
| 49 |
}; |
| 50 |
|
| 51 |
static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
|
| 52 |
{
|
| 53 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
| 54 |
|
| 55 |
return &n->vqs[nc->queue_index];
|
| 56 |
} |
| 57 |
|
| 58 |
static int vq2q(int queue_index) |
| 59 |
{
|
| 60 |
return queue_index / 2; |
| 61 |
} |
| 62 |
|
| 63 |
/* TODO
|
| 64 |
* - we could suppress RX interrupt if we were so inclined.
|
| 65 |
*/
|
| 66 |
|
| 67 |
static VirtIONet *to_virtio_net(VirtIODevice *vdev)
|
| 68 |
{
|
| 69 |
return (VirtIONet *)vdev;
|
| 70 |
} |
| 71 |
|
| 72 |
static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) |
| 73 |
{
|
| 74 |
VirtIONet *n = to_virtio_net(vdev); |
| 75 |
struct virtio_net_config netcfg;
|
| 76 |
|
| 77 |
stw_p(&netcfg.status, n->status); |
| 78 |
stw_p(&netcfg.max_virtqueue_pairs, n->max_queues); |
| 79 |
memcpy(netcfg.mac, n->mac, ETH_ALEN); |
| 80 |
memcpy(config, &netcfg, n->config_size); |
| 81 |
} |
| 82 |
|
| 83 |
static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) |
| 84 |
{
|
| 85 |
VirtIONet *n = to_virtio_net(vdev); |
| 86 |
struct virtio_net_config netcfg = {};
|
| 87 |
|
| 88 |
memcpy(&netcfg, config, n->config_size); |
| 89 |
|
| 90 |
if (!(n->vdev.guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) && |
| 91 |
memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
|
| 92 |
memcpy(n->mac, netcfg.mac, ETH_ALEN); |
| 93 |
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); |
| 94 |
} |
| 95 |
} |
| 96 |
|
| 97 |
static bool virtio_net_started(VirtIONet *n, uint8_t status) |
| 98 |
{
|
| 99 |
return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
|
| 100 |
(n->status & VIRTIO_NET_S_LINK_UP) && n->vdev.vm_running; |
| 101 |
} |
| 102 |
|
| 103 |
static void virtio_net_vhost_status(VirtIONet *n, uint8_t status) |
| 104 |
{
|
| 105 |
NetClientState *nc = qemu_get_queue(n->nic); |
| 106 |
int queues = n->multiqueue ? n->max_queues : 1; |
| 107 |
|
| 108 |
if (!nc->peer) {
|
| 109 |
return;
|
| 110 |
} |
| 111 |
if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
|
| 112 |
return;
|
| 113 |
} |
| 114 |
|
| 115 |
if (!tap_get_vhost_net(nc->peer)) {
|
| 116 |
return;
|
| 117 |
} |
| 118 |
|
| 119 |
if (!!n->vhost_started == virtio_net_started(n, status) &&
|
| 120 |
!nc->peer->link_down) {
|
| 121 |
return;
|
| 122 |
} |
| 123 |
if (!n->vhost_started) {
|
| 124 |
int r;
|
| 125 |
if (!vhost_net_query(tap_get_vhost_net(nc->peer), &n->vdev)) {
|
| 126 |
return;
|
| 127 |
} |
| 128 |
n->vhost_started = 1;
|
| 129 |
r = vhost_net_start(&n->vdev, n->nic->ncs, queues); |
| 130 |
if (r < 0) { |
| 131 |
error_report("unable to start vhost net: %d: "
|
| 132 |
"falling back on userspace virtio", -r);
|
| 133 |
n->vhost_started = 0;
|
| 134 |
} |
| 135 |
} else {
|
| 136 |
vhost_net_stop(&n->vdev, n->nic->ncs, queues); |
| 137 |
n->vhost_started = 0;
|
| 138 |
} |
| 139 |
} |
| 140 |
|
| 141 |
static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) |
| 142 |
{
|
| 143 |
VirtIONet *n = to_virtio_net(vdev); |
| 144 |
VirtIONetQueue *q; |
| 145 |
int i;
|
| 146 |
uint8_t queue_status; |
| 147 |
|
| 148 |
virtio_net_vhost_status(n, status); |
| 149 |
|
| 150 |
for (i = 0; i < n->max_queues; i++) { |
| 151 |
q = &n->vqs[i]; |
| 152 |
|
| 153 |
if ((!n->multiqueue && i != 0) || i >= n->curr_queues) { |
| 154 |
queue_status = 0;
|
| 155 |
} else {
|
| 156 |
queue_status = status; |
| 157 |
} |
| 158 |
|
| 159 |
if (!q->tx_waiting) {
|
| 160 |
continue;
|
| 161 |
} |
| 162 |
|
| 163 |
if (virtio_net_started(n, queue_status) && !n->vhost_started) {
|
| 164 |
if (q->tx_timer) {
|
| 165 |
qemu_mod_timer(q->tx_timer, |
| 166 |
qemu_get_clock_ns(vm_clock) + n->tx_timeout); |
| 167 |
} else {
|
| 168 |
qemu_bh_schedule(q->tx_bh); |
| 169 |
} |
| 170 |
} else {
|
| 171 |
if (q->tx_timer) {
|
| 172 |
qemu_del_timer(q->tx_timer); |
| 173 |
} else {
|
| 174 |
qemu_bh_cancel(q->tx_bh); |
| 175 |
} |
| 176 |
} |
| 177 |
} |
| 178 |
} |
| 179 |
|
| 180 |
static void virtio_net_set_link_status(NetClientState *nc) |
| 181 |
{
|
| 182 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
| 183 |
uint16_t old_status = n->status; |
| 184 |
|
| 185 |
if (nc->link_down)
|
| 186 |
n->status &= ~VIRTIO_NET_S_LINK_UP; |
| 187 |
else
|
| 188 |
n->status |= VIRTIO_NET_S_LINK_UP; |
| 189 |
|
| 190 |
if (n->status != old_status)
|
| 191 |
virtio_notify_config(&n->vdev); |
| 192 |
|
| 193 |
virtio_net_set_status(&n->vdev, n->vdev.status); |
| 194 |
} |
| 195 |
|
| 196 |
static void virtio_net_reset(VirtIODevice *vdev) |
| 197 |
{
|
| 198 |
VirtIONet *n = to_virtio_net(vdev); |
| 199 |
|
| 200 |
/* Reset back to compatibility mode */
|
| 201 |
n->promisc = 1;
|
| 202 |
n->allmulti = 0;
|
| 203 |
n->alluni = 0;
|
| 204 |
n->nomulti = 0;
|
| 205 |
n->nouni = 0;
|
| 206 |
n->nobcast = 0;
|
| 207 |
/* multiqueue is disabled by default */
|
| 208 |
n->curr_queues = 1;
|
| 209 |
|
| 210 |
/* Flush any MAC and VLAN filter table state */
|
| 211 |
n->mac_table.in_use = 0;
|
| 212 |
n->mac_table.first_multi = 0;
|
| 213 |
n->mac_table.multi_overflow = 0;
|
| 214 |
n->mac_table.uni_overflow = 0;
|
| 215 |
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
|
| 216 |
memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac)); |
| 217 |
memset(n->vlans, 0, MAX_VLAN >> 3); |
| 218 |
} |
| 219 |
|
| 220 |
static void peer_test_vnet_hdr(VirtIONet *n) |
| 221 |
{
|
| 222 |
NetClientState *nc = qemu_get_queue(n->nic); |
| 223 |
if (!nc->peer) {
|
| 224 |
return;
|
| 225 |
} |
| 226 |
|
| 227 |
if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
|
| 228 |
return;
|
| 229 |
} |
| 230 |
|
| 231 |
n->has_vnet_hdr = tap_has_vnet_hdr(nc->peer); |
| 232 |
} |
| 233 |
|
| 234 |
static int peer_has_vnet_hdr(VirtIONet *n) |
| 235 |
{
|
| 236 |
return n->has_vnet_hdr;
|
| 237 |
} |
| 238 |
|
| 239 |
static int peer_has_ufo(VirtIONet *n) |
| 240 |
{
|
| 241 |
if (!peer_has_vnet_hdr(n))
|
| 242 |
return 0; |
| 243 |
|
| 244 |
n->has_ufo = tap_has_ufo(qemu_get_queue(n->nic)->peer); |
| 245 |
|
| 246 |
return n->has_ufo;
|
| 247 |
} |
| 248 |
|
| 249 |
static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs) |
| 250 |
{
|
| 251 |
int i;
|
| 252 |
NetClientState *nc; |
| 253 |
|
| 254 |
n->mergeable_rx_bufs = mergeable_rx_bufs; |
| 255 |
|
| 256 |
n->guest_hdr_len = n->mergeable_rx_bufs ? |
| 257 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); |
| 258 |
|
| 259 |
for (i = 0; i < n->max_queues; i++) { |
| 260 |
nc = qemu_get_subqueue(n->nic, i); |
| 261 |
|
| 262 |
if (peer_has_vnet_hdr(n) &&
|
| 263 |
tap_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
|
| 264 |
tap_set_vnet_hdr_len(nc->peer, n->guest_hdr_len); |
| 265 |
n->host_hdr_len = n->guest_hdr_len; |
| 266 |
} |
| 267 |
} |
| 268 |
} |
| 269 |
|
| 270 |
static int peer_attach(VirtIONet *n, int index) |
| 271 |
{
|
| 272 |
NetClientState *nc = qemu_get_subqueue(n->nic, index); |
| 273 |
|
| 274 |
if (!nc->peer) {
|
| 275 |
return 0; |
| 276 |
} |
| 277 |
|
| 278 |
if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
|
| 279 |
return 0; |
| 280 |
} |
| 281 |
|
| 282 |
return tap_enable(nc->peer);
|
| 283 |
} |
| 284 |
|
| 285 |
static int peer_detach(VirtIONet *n, int index) |
| 286 |
{
|
| 287 |
NetClientState *nc = qemu_get_subqueue(n->nic, index); |
| 288 |
|
| 289 |
if (!nc->peer) {
|
| 290 |
return 0; |
| 291 |
} |
| 292 |
|
| 293 |
if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
|
| 294 |
return 0; |
| 295 |
} |
| 296 |
|
| 297 |
return tap_disable(nc->peer);
|
| 298 |
} |
| 299 |
|
| 300 |
static void virtio_net_set_queues(VirtIONet *n) |
| 301 |
{
|
| 302 |
int i;
|
| 303 |
|
| 304 |
for (i = 0; i < n->max_queues; i++) { |
| 305 |
if (i < n->curr_queues) {
|
| 306 |
assert(!peer_attach(n, i)); |
| 307 |
} else {
|
| 308 |
assert(!peer_detach(n, i)); |
| 309 |
} |
| 310 |
} |
| 311 |
} |
| 312 |
|
| 313 |
static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl); |
| 314 |
|
| 315 |
static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
|
| 316 |
{
|
| 317 |
VirtIONet *n = to_virtio_net(vdev); |
| 318 |
NetClientState *nc = qemu_get_queue(n->nic); |
| 319 |
|
| 320 |
features |= (1 << VIRTIO_NET_F_MAC);
|
| 321 |
|
| 322 |
if (!peer_has_vnet_hdr(n)) {
|
| 323 |
features &= ~(0x1 << VIRTIO_NET_F_CSUM);
|
| 324 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4);
|
| 325 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6);
|
| 326 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN);
|
| 327 |
|
| 328 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM);
|
| 329 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4);
|
| 330 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6);
|
| 331 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN);
|
| 332 |
} |
| 333 |
|
| 334 |
if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
|
| 335 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO);
|
| 336 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO);
|
| 337 |
} |
| 338 |
|
| 339 |
if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
|
| 340 |
return features;
|
| 341 |
} |
| 342 |
if (!tap_get_vhost_net(nc->peer)) {
|
| 343 |
return features;
|
| 344 |
} |
| 345 |
return vhost_net_get_features(tap_get_vhost_net(nc->peer), features);
|
| 346 |
} |
| 347 |
|
| 348 |
static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
|
| 349 |
{
|
| 350 |
uint32_t features = 0;
|
| 351 |
|
| 352 |
/* Linux kernel 2.6.25. It understood MAC (as everyone must),
|
| 353 |
* but also these: */
|
| 354 |
features |= (1 << VIRTIO_NET_F_MAC);
|
| 355 |
features |= (1 << VIRTIO_NET_F_CSUM);
|
| 356 |
features |= (1 << VIRTIO_NET_F_HOST_TSO4);
|
| 357 |
features |= (1 << VIRTIO_NET_F_HOST_TSO6);
|
| 358 |
features |= (1 << VIRTIO_NET_F_HOST_ECN);
|
| 359 |
|
| 360 |
return features;
|
| 361 |
} |
| 362 |
|
| 363 |
static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) |
| 364 |
{
|
| 365 |
VirtIONet *n = to_virtio_net(vdev); |
| 366 |
int i;
|
| 367 |
|
| 368 |
virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ)),
|
| 369 |
!!(features & (1 << VIRTIO_NET_F_CTRL_VQ)));
|
| 370 |
|
| 371 |
virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF)));
|
| 372 |
|
| 373 |
if (n->has_vnet_hdr) {
|
| 374 |
tap_set_offload(qemu_get_subqueue(n->nic, 0)->peer,
|
| 375 |
(features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
| 376 |
(features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
| 377 |
(features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
| 378 |
(features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
| 379 |
(features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
| 380 |
} |
| 381 |
|
| 382 |
for (i = 0; i < n->max_queues; i++) { |
| 383 |
NetClientState *nc = qemu_get_subqueue(n->nic, i); |
| 384 |
|
| 385 |
if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
|
| 386 |
continue;
|
| 387 |
} |
| 388 |
if (!tap_get_vhost_net(nc->peer)) {
|
| 389 |
continue;
|
| 390 |
} |
| 391 |
vhost_net_ack_features(tap_get_vhost_net(nc->peer), features); |
| 392 |
} |
| 393 |
} |
| 394 |
|
| 395 |
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, |
| 396 |
struct iovec *iov, unsigned int iov_cnt) |
| 397 |
{
|
| 398 |
uint8_t on; |
| 399 |
size_t s; |
| 400 |
|
| 401 |
s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on)); |
| 402 |
if (s != sizeof(on)) { |
| 403 |
return VIRTIO_NET_ERR;
|
| 404 |
} |
| 405 |
|
| 406 |
if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
|
| 407 |
n->promisc = on; |
| 408 |
} else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) { |
| 409 |
n->allmulti = on; |
| 410 |
} else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) { |
| 411 |
n->alluni = on; |
| 412 |
} else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) { |
| 413 |
n->nomulti = on; |
| 414 |
} else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) { |
| 415 |
n->nouni = on; |
| 416 |
} else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) { |
| 417 |
n->nobcast = on; |
| 418 |
} else {
|
| 419 |
return VIRTIO_NET_ERR;
|
| 420 |
} |
| 421 |
|
| 422 |
return VIRTIO_NET_OK;
|
| 423 |
} |
| 424 |
|
| 425 |
static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, |
| 426 |
struct iovec *iov, unsigned int iov_cnt) |
| 427 |
{
|
| 428 |
struct virtio_net_ctrl_mac mac_data;
|
| 429 |
size_t s; |
| 430 |
|
| 431 |
if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
|
| 432 |
if (iov_size(iov, iov_cnt) != sizeof(n->mac)) { |
| 433 |
return VIRTIO_NET_ERR;
|
| 434 |
} |
| 435 |
s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac)); |
| 436 |
assert(s == sizeof(n->mac));
|
| 437 |
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac); |
| 438 |
return VIRTIO_NET_OK;
|
| 439 |
} |
| 440 |
|
| 441 |
if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
|
| 442 |
return VIRTIO_NET_ERR;
|
| 443 |
} |
| 444 |
|
| 445 |
n->mac_table.in_use = 0;
|
| 446 |
n->mac_table.first_multi = 0;
|
| 447 |
n->mac_table.uni_overflow = 0;
|
| 448 |
n->mac_table.multi_overflow = 0;
|
| 449 |
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
|
| 450 |
|
| 451 |
s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
|
| 452 |
sizeof(mac_data.entries));
|
| 453 |
mac_data.entries = ldl_p(&mac_data.entries); |
| 454 |
if (s != sizeof(mac_data.entries)) { |
| 455 |
return VIRTIO_NET_ERR;
|
| 456 |
} |
| 457 |
iov_discard_front(&iov, &iov_cnt, s); |
| 458 |
|
| 459 |
if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
|
| 460 |
return VIRTIO_NET_ERR;
|
| 461 |
} |
| 462 |
|
| 463 |
if (mac_data.entries <= MAC_TABLE_ENTRIES) {
|
| 464 |
s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
|
| 465 |
mac_data.entries * ETH_ALEN); |
| 466 |
if (s != mac_data.entries * ETH_ALEN) {
|
| 467 |
return VIRTIO_NET_ERR;
|
| 468 |
} |
| 469 |
n->mac_table.in_use += mac_data.entries; |
| 470 |
} else {
|
| 471 |
n->mac_table.uni_overflow = 1;
|
| 472 |
} |
| 473 |
|
| 474 |
iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN); |
| 475 |
|
| 476 |
n->mac_table.first_multi = n->mac_table.in_use; |
| 477 |
|
| 478 |
s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
|
| 479 |
sizeof(mac_data.entries));
|
| 480 |
mac_data.entries = ldl_p(&mac_data.entries); |
| 481 |
if (s != sizeof(mac_data.entries)) { |
| 482 |
return VIRTIO_NET_ERR;
|
| 483 |
} |
| 484 |
|
| 485 |
iov_discard_front(&iov, &iov_cnt, s); |
| 486 |
|
| 487 |
if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
|
| 488 |
return VIRTIO_NET_ERR;
|
| 489 |
} |
| 490 |
|
| 491 |
if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
|
| 492 |
s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
|
| 493 |
mac_data.entries * ETH_ALEN); |
| 494 |
if (s != mac_data.entries * ETH_ALEN) {
|
| 495 |
return VIRTIO_NET_ERR;
|
| 496 |
} |
| 497 |
n->mac_table.in_use += mac_data.entries; |
| 498 |
} else {
|
| 499 |
n->mac_table.multi_overflow = 1;
|
| 500 |
} |
| 501 |
|
| 502 |
return VIRTIO_NET_OK;
|
| 503 |
} |
| 504 |
|
| 505 |
static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, |
| 506 |
struct iovec *iov, unsigned int iov_cnt) |
| 507 |
{
|
| 508 |
uint16_t vid; |
| 509 |
size_t s; |
| 510 |
|
| 511 |
s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid)); |
| 512 |
vid = lduw_p(&vid); |
| 513 |
if (s != sizeof(vid)) { |
| 514 |
return VIRTIO_NET_ERR;
|
| 515 |
} |
| 516 |
|
| 517 |
if (vid >= MAX_VLAN)
|
| 518 |
return VIRTIO_NET_ERR;
|
| 519 |
|
| 520 |
if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
|
| 521 |
n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); |
| 522 |
else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) |
| 523 |
n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); |
| 524 |
else
|
| 525 |
return VIRTIO_NET_ERR;
|
| 526 |
|
| 527 |
return VIRTIO_NET_OK;
|
| 528 |
} |
| 529 |
|
| 530 |
static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd, |
| 531 |
struct iovec *iov, unsigned int iov_cnt) |
| 532 |
{
|
| 533 |
struct virtio_net_ctrl_mq mq;
|
| 534 |
size_t s; |
| 535 |
uint16_t queues; |
| 536 |
|
| 537 |
s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq)); |
| 538 |
if (s != sizeof(mq)) { |
| 539 |
return VIRTIO_NET_ERR;
|
| 540 |
} |
| 541 |
|
| 542 |
if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
|
| 543 |
return VIRTIO_NET_ERR;
|
| 544 |
} |
| 545 |
|
| 546 |
queues = lduw_p(&mq.virtqueue_pairs); |
| 547 |
|
| 548 |
if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
|
| 549 |
queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || |
| 550 |
queues > n->max_queues || |
| 551 |
!n->multiqueue) {
|
| 552 |
return VIRTIO_NET_ERR;
|
| 553 |
} |
| 554 |
|
| 555 |
n->curr_queues = queues; |
| 556 |
/* stop the backend before changing the number of queues to avoid handling a
|
| 557 |
* disabled queue */
|
| 558 |
virtio_net_set_status(&n->vdev, n->vdev.status); |
| 559 |
virtio_net_set_queues(n); |
| 560 |
|
| 561 |
return VIRTIO_NET_OK;
|
| 562 |
} |
| 563 |
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
| 564 |
{
|
| 565 |
VirtIONet *n = to_virtio_net(vdev); |
| 566 |
struct virtio_net_ctrl_hdr ctrl;
|
| 567 |
virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
| 568 |
VirtQueueElement elem; |
| 569 |
size_t s; |
| 570 |
struct iovec *iov;
|
| 571 |
unsigned int iov_cnt; |
| 572 |
|
| 573 |
while (virtqueue_pop(vq, &elem)) {
|
| 574 |
if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) || |
| 575 |
iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) {
|
| 576 |
error_report("virtio-net ctrl missing headers");
|
| 577 |
exit(1);
|
| 578 |
} |
| 579 |
|
| 580 |
iov = elem.out_sg; |
| 581 |
iov_cnt = elem.out_num; |
| 582 |
s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl)); |
| 583 |
iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
|
| 584 |
if (s != sizeof(ctrl)) { |
| 585 |
status = VIRTIO_NET_ERR; |
| 586 |
} else if (ctrl.class == VIRTIO_NET_CTRL_RX) { |
| 587 |
status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt); |
| 588 |
} else if (ctrl.class == VIRTIO_NET_CTRL_MAC) { |
| 589 |
status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt); |
| 590 |
} else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) { |
| 591 |
status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt); |
| 592 |
} else if (ctrl.class == VIRTIO_NET_CTRL_MQ) { |
| 593 |
status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt); |
| 594 |
} |
| 595 |
|
| 596 |
s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status)); |
| 597 |
assert(s == sizeof(status));
|
| 598 |
|
| 599 |
virtqueue_push(vq, &elem, sizeof(status));
|
| 600 |
virtio_notify(vdev, vq); |
| 601 |
} |
| 602 |
} |
| 603 |
|
| 604 |
/* RX */
|
| 605 |
|
| 606 |
static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
| 607 |
{
|
| 608 |
VirtIONet *n = to_virtio_net(vdev); |
| 609 |
int queue_index = vq2q(virtio_get_queue_index(vq));
|
| 610 |
|
| 611 |
qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index)); |
| 612 |
} |
| 613 |
|
| 614 |
static int virtio_net_can_receive(NetClientState *nc) |
| 615 |
{
|
| 616 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
| 617 |
VirtIONetQueue *q = virtio_net_get_subqueue(nc); |
| 618 |
|
| 619 |
if (!n->vdev.vm_running) {
|
| 620 |
return 0; |
| 621 |
} |
| 622 |
|
| 623 |
if (nc->queue_index >= n->curr_queues) {
|
| 624 |
return 0; |
| 625 |
} |
| 626 |
|
| 627 |
if (!virtio_queue_ready(q->rx_vq) ||
|
| 628 |
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
| 629 |
return 0; |
| 630 |
} |
| 631 |
|
| 632 |
return 1; |
| 633 |
} |
| 634 |
|
| 635 |
static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize) |
| 636 |
{
|
| 637 |
VirtIONet *n = q->n; |
| 638 |
if (virtio_queue_empty(q->rx_vq) ||
|
| 639 |
(n->mergeable_rx_bufs && |
| 640 |
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
|
| 641 |
virtio_queue_set_notification(q->rx_vq, 1);
|
| 642 |
|
| 643 |
/* To avoid a race condition where the guest has made some buffers
|
| 644 |
* available after the above check but before notification was
|
| 645 |
* enabled, check for available buffers again.
|
| 646 |
*/
|
| 647 |
if (virtio_queue_empty(q->rx_vq) ||
|
| 648 |
(n->mergeable_rx_bufs && |
| 649 |
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
|
| 650 |
return 0; |
| 651 |
} |
| 652 |
} |
| 653 |
|
| 654 |
virtio_queue_set_notification(q->rx_vq, 0);
|
| 655 |
return 1; |
| 656 |
} |
| 657 |
|
| 658 |
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
| 659 |
* it never finds out that the packets don't have valid checksums. This
|
| 660 |
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
| 661 |
* fix this with Xen but it hasn't appeared in an upstream release of
|
| 662 |
* dhclient yet.
|
| 663 |
*
|
| 664 |
* To avoid breaking existing guests, we catch udp packets and add
|
| 665 |
* checksums. This is terrible but it's better than hacking the guest
|
| 666 |
* kernels.
|
| 667 |
*
|
| 668 |
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
| 669 |
* we should provide a mechanism to disable it to avoid polluting the host
|
| 670 |
* cache.
|
| 671 |
*/
|
| 672 |
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, |
| 673 |
uint8_t *buf, size_t size) |
| 674 |
{
|
| 675 |
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ |
| 676 |
(size > 27 && size < 1500) && /* normal sized MTU */ |
| 677 |
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ |
| 678 |
(buf[23] == 17) && /* ip.protocol == UDP */ |
| 679 |
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ |
| 680 |
net_checksum_calculate(buf, size); |
| 681 |
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| 682 |
} |
| 683 |
} |
| 684 |
|
| 685 |
static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt, |
| 686 |
const void *buf, size_t size) |
| 687 |
{
|
| 688 |
if (n->has_vnet_hdr) {
|
| 689 |
/* FIXME this cast is evil */
|
| 690 |
void *wbuf = (void *)buf; |
| 691 |
work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len, |
| 692 |
size - n->host_hdr_len); |
| 693 |
iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr)); |
| 694 |
} else {
|
| 695 |
struct virtio_net_hdr hdr = {
|
| 696 |
.flags = 0,
|
| 697 |
.gso_type = VIRTIO_NET_HDR_GSO_NONE |
| 698 |
}; |
| 699 |
iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr); |
| 700 |
} |
| 701 |
} |
| 702 |
|
| 703 |
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
| 704 |
{
|
| 705 |
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
| 706 |
static const uint8_t vlan[] = {0x81, 0x00}; |
| 707 |
uint8_t *ptr = (uint8_t *)buf; |
| 708 |
int i;
|
| 709 |
|
| 710 |
if (n->promisc)
|
| 711 |
return 1; |
| 712 |
|
| 713 |
ptr += n->host_hdr_len; |
| 714 |
|
| 715 |
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
| 716 |
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
| 717 |
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
| 718 |
return 0; |
| 719 |
} |
| 720 |
|
| 721 |
if (ptr[0] & 1) { // multicast |
| 722 |
if (!memcmp(ptr, bcast, sizeof(bcast))) { |
| 723 |
return !n->nobcast;
|
| 724 |
} else if (n->nomulti) { |
| 725 |
return 0; |
| 726 |
} else if (n->allmulti || n->mac_table.multi_overflow) { |
| 727 |
return 1; |
| 728 |
} |
| 729 |
|
| 730 |
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
| 731 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
| 732 |
return 1; |
| 733 |
} |
| 734 |
} |
| 735 |
} else { // unicast |
| 736 |
if (n->nouni) {
|
| 737 |
return 0; |
| 738 |
} else if (n->alluni || n->mac_table.uni_overflow) { |
| 739 |
return 1; |
| 740 |
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) { |
| 741 |
return 1; |
| 742 |
} |
| 743 |
|
| 744 |
for (i = 0; i < n->mac_table.first_multi; i++) { |
| 745 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
| 746 |
return 1; |
| 747 |
} |
| 748 |
} |
| 749 |
} |
| 750 |
|
| 751 |
return 0; |
| 752 |
} |
| 753 |
|
| 754 |
static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size) |
| 755 |
{
|
| 756 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
| 757 |
VirtIONetQueue *q = virtio_net_get_subqueue(nc); |
| 758 |
struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
|
| 759 |
struct virtio_net_hdr_mrg_rxbuf mhdr;
|
| 760 |
unsigned mhdr_cnt = 0; |
| 761 |
size_t offset, i, guest_offset; |
| 762 |
|
| 763 |
if (!virtio_net_can_receive(nc)) {
|
| 764 |
return -1; |
| 765 |
} |
| 766 |
|
| 767 |
/* hdr_len refers to the header we supply to the guest */
|
| 768 |
if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
|
| 769 |
return 0; |
| 770 |
} |
| 771 |
|
| 772 |
if (!receive_filter(n, buf, size))
|
| 773 |
return size;
|
| 774 |
|
| 775 |
offset = i = 0;
|
| 776 |
|
| 777 |
while (offset < size) {
|
| 778 |
VirtQueueElement elem; |
| 779 |
int len, total;
|
| 780 |
const struct iovec *sg = elem.in_sg; |
| 781 |
|
| 782 |
total = 0;
|
| 783 |
|
| 784 |
if (virtqueue_pop(q->rx_vq, &elem) == 0) { |
| 785 |
if (i == 0) |
| 786 |
return -1; |
| 787 |
error_report("virtio-net unexpected empty queue: "
|
| 788 |
"i %zd mergeable %d offset %zd, size %zd, "
|
| 789 |
"guest hdr len %zd, host hdr len %zd guest features 0x%x",
|
| 790 |
i, n->mergeable_rx_bufs, offset, size, |
| 791 |
n->guest_hdr_len, n->host_hdr_len, n->vdev.guest_features); |
| 792 |
exit(1);
|
| 793 |
} |
| 794 |
|
| 795 |
if (elem.in_num < 1) { |
| 796 |
error_report("virtio-net receive queue contains no in buffers");
|
| 797 |
exit(1);
|
| 798 |
} |
| 799 |
|
| 800 |
if (i == 0) { |
| 801 |
assert(offset == 0);
|
| 802 |
if (n->mergeable_rx_bufs) {
|
| 803 |
mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg), |
| 804 |
sg, elem.in_num, |
| 805 |
offsetof(typeof(mhdr), num_buffers), |
| 806 |
sizeof(mhdr.num_buffers));
|
| 807 |
} |
| 808 |
|
| 809 |
receive_header(n, sg, elem.in_num, buf, size); |
| 810 |
offset = n->host_hdr_len; |
| 811 |
total += n->guest_hdr_len; |
| 812 |
guest_offset = n->guest_hdr_len; |
| 813 |
} else {
|
| 814 |
guest_offset = 0;
|
| 815 |
} |
| 816 |
|
| 817 |
/* copy in packet. ugh */
|
| 818 |
len = iov_from_buf(sg, elem.in_num, guest_offset, |
| 819 |
buf + offset, size - offset); |
| 820 |
total += len; |
| 821 |
offset += len; |
| 822 |
/* If buffers can't be merged, at this point we
|
| 823 |
* must have consumed the complete packet.
|
| 824 |
* Otherwise, drop it. */
|
| 825 |
if (!n->mergeable_rx_bufs && offset < size) {
|
| 826 |
#if 0
|
| 827 |
error_report("virtio-net truncated non-mergeable packet: "
|
| 828 |
"i %zd mergeable %d offset %zd, size %zd, "
|
| 829 |
"guest hdr len %zd, host hdr len %zd",
|
| 830 |
i, n->mergeable_rx_bufs,
|
| 831 |
offset, size, n->guest_hdr_len, n->host_hdr_len);
|
| 832 |
#endif
|
| 833 |
return size;
|
| 834 |
} |
| 835 |
|
| 836 |
/* signal other side */
|
| 837 |
virtqueue_fill(q->rx_vq, &elem, total, i++); |
| 838 |
} |
| 839 |
|
| 840 |
if (mhdr_cnt) {
|
| 841 |
stw_p(&mhdr.num_buffers, i); |
| 842 |
iov_from_buf(mhdr_sg, mhdr_cnt, |
| 843 |
0,
|
| 844 |
&mhdr.num_buffers, sizeof mhdr.num_buffers);
|
| 845 |
} |
| 846 |
|
| 847 |
virtqueue_flush(q->rx_vq, i); |
| 848 |
virtio_notify(&n->vdev, q->rx_vq); |
| 849 |
|
| 850 |
return size;
|
| 851 |
} |
| 852 |
|
| 853 |
static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
|
| 854 |
|
| 855 |
static void virtio_net_tx_complete(NetClientState *nc, ssize_t len) |
| 856 |
{
|
| 857 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
| 858 |
VirtIONetQueue *q = virtio_net_get_subqueue(nc); |
| 859 |
|
| 860 |
virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
|
| 861 |
virtio_notify(&n->vdev, q->tx_vq); |
| 862 |
|
| 863 |
q->async_tx.elem.out_num = q->async_tx.len = 0;
|
| 864 |
|
| 865 |
virtio_queue_set_notification(q->tx_vq, 1);
|
| 866 |
virtio_net_flush_tx(q); |
| 867 |
} |
| 868 |
|
| 869 |
/* TX */
|
| 870 |
static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
|
| 871 |
{
|
| 872 |
VirtIONet *n = q->n; |
| 873 |
VirtQueueElement elem; |
| 874 |
int32_t num_packets = 0;
|
| 875 |
int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
|
| 876 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
| 877 |
return num_packets;
|
| 878 |
} |
| 879 |
|
| 880 |
assert(n->vdev.vm_running); |
| 881 |
|
| 882 |
if (q->async_tx.elem.out_num) {
|
| 883 |
virtio_queue_set_notification(q->tx_vq, 0);
|
| 884 |
return num_packets;
|
| 885 |
} |
| 886 |
|
| 887 |
while (virtqueue_pop(q->tx_vq, &elem)) {
|
| 888 |
ssize_t ret, len; |
| 889 |
unsigned int out_num = elem.out_num; |
| 890 |
struct iovec *out_sg = &elem.out_sg[0]; |
| 891 |
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
| 892 |
|
| 893 |
if (out_num < 1) { |
| 894 |
error_report("virtio-net header not in first element");
|
| 895 |
exit(1);
|
| 896 |
} |
| 897 |
|
| 898 |
/*
|
| 899 |
* If host wants to see the guest header as is, we can
|
| 900 |
* pass it on unchanged. Otherwise, copy just the parts
|
| 901 |
* that host is interested in.
|
| 902 |
*/
|
| 903 |
assert(n->host_hdr_len <= n->guest_hdr_len); |
| 904 |
if (n->host_hdr_len != n->guest_hdr_len) {
|
| 905 |
unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
|
| 906 |
out_sg, out_num, |
| 907 |
0, n->host_hdr_len);
|
| 908 |
sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num, |
| 909 |
out_sg, out_num, |
| 910 |
n->guest_hdr_len, -1);
|
| 911 |
out_num = sg_num; |
| 912 |
out_sg = sg; |
| 913 |
} |
| 914 |
|
| 915 |
len = n->guest_hdr_len; |
| 916 |
|
| 917 |
ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index), |
| 918 |
out_sg, out_num, virtio_net_tx_complete); |
| 919 |
if (ret == 0) { |
| 920 |
virtio_queue_set_notification(q->tx_vq, 0);
|
| 921 |
q->async_tx.elem = elem; |
| 922 |
q->async_tx.len = len; |
| 923 |
return -EBUSY;
|
| 924 |
} |
| 925 |
|
| 926 |
len += ret; |
| 927 |
|
| 928 |
virtqueue_push(q->tx_vq, &elem, 0);
|
| 929 |
virtio_notify(&n->vdev, q->tx_vq); |
| 930 |
|
| 931 |
if (++num_packets >= n->tx_burst) {
|
| 932 |
break;
|
| 933 |
} |
| 934 |
} |
| 935 |
return num_packets;
|
| 936 |
} |
| 937 |
|
| 938 |
static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq) |
| 939 |
{
|
| 940 |
VirtIONet *n = to_virtio_net(vdev); |
| 941 |
VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; |
| 942 |
|
| 943 |
/* This happens when device was stopped but VCPU wasn't. */
|
| 944 |
if (!n->vdev.vm_running) {
|
| 945 |
q->tx_waiting = 1;
|
| 946 |
return;
|
| 947 |
} |
| 948 |
|
| 949 |
if (q->tx_waiting) {
|
| 950 |
virtio_queue_set_notification(vq, 1);
|
| 951 |
qemu_del_timer(q->tx_timer); |
| 952 |
q->tx_waiting = 0;
|
| 953 |
virtio_net_flush_tx(q); |
| 954 |
} else {
|
| 955 |
qemu_mod_timer(q->tx_timer, |
| 956 |
qemu_get_clock_ns(vm_clock) + n->tx_timeout); |
| 957 |
q->tx_waiting = 1;
|
| 958 |
virtio_queue_set_notification(vq, 0);
|
| 959 |
} |
| 960 |
} |
| 961 |
|
| 962 |
static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq) |
| 963 |
{
|
| 964 |
VirtIONet *n = to_virtio_net(vdev); |
| 965 |
VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))]; |
| 966 |
|
| 967 |
if (unlikely(q->tx_waiting)) {
|
| 968 |
return;
|
| 969 |
} |
| 970 |
q->tx_waiting = 1;
|
| 971 |
/* This happens when device was stopped but VCPU wasn't. */
|
| 972 |
if (!n->vdev.vm_running) {
|
| 973 |
return;
|
| 974 |
} |
| 975 |
virtio_queue_set_notification(vq, 0);
|
| 976 |
qemu_bh_schedule(q->tx_bh); |
| 977 |
} |
| 978 |
|
| 979 |
static void virtio_net_tx_timer(void *opaque) |
| 980 |
{
|
| 981 |
VirtIONetQueue *q = opaque; |
| 982 |
VirtIONet *n = q->n; |
| 983 |
assert(n->vdev.vm_running); |
| 984 |
|
| 985 |
q->tx_waiting = 0;
|
| 986 |
|
| 987 |
/* Just in case the driver is not ready on more */
|
| 988 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
| 989 |
return;
|
| 990 |
|
| 991 |
virtio_queue_set_notification(q->tx_vq, 1);
|
| 992 |
virtio_net_flush_tx(q); |
| 993 |
} |
| 994 |
|
| 995 |
static void virtio_net_tx_bh(void *opaque) |
| 996 |
{
|
| 997 |
VirtIONetQueue *q = opaque; |
| 998 |
VirtIONet *n = q->n; |
| 999 |
int32_t ret; |
| 1000 |
|
| 1001 |
assert(n->vdev.vm_running); |
| 1002 |
|
| 1003 |
q->tx_waiting = 0;
|
| 1004 |
|
| 1005 |
/* Just in case the driver is not ready on more */
|
| 1006 |
if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)))
|
| 1007 |
return;
|
| 1008 |
|
| 1009 |
ret = virtio_net_flush_tx(q); |
| 1010 |
if (ret == -EBUSY) {
|
| 1011 |
return; /* Notification re-enable handled by tx_complete */ |
| 1012 |
} |
| 1013 |
|
| 1014 |
/* If we flush a full burst of packets, assume there are
|
| 1015 |
* more coming and immediately reschedule */
|
| 1016 |
if (ret >= n->tx_burst) {
|
| 1017 |
qemu_bh_schedule(q->tx_bh); |
| 1018 |
q->tx_waiting = 1;
|
| 1019 |
return;
|
| 1020 |
} |
| 1021 |
|
| 1022 |
/* If less than a full burst, re-enable notification and flush
|
| 1023 |
* anything that may have come in while we weren't looking. If
|
| 1024 |
* we find something, assume the guest is still active and reschedule */
|
| 1025 |
virtio_queue_set_notification(q->tx_vq, 1);
|
| 1026 |
if (virtio_net_flush_tx(q) > 0) { |
| 1027 |
virtio_queue_set_notification(q->tx_vq, 0);
|
| 1028 |
qemu_bh_schedule(q->tx_bh); |
| 1029 |
q->tx_waiting = 1;
|
| 1030 |
} |
| 1031 |
} |
| 1032 |
|
| 1033 |
static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue, int ctrl) |
| 1034 |
{
|
| 1035 |
VirtIODevice *vdev = &n->vdev; |
| 1036 |
int i, max = multiqueue ? n->max_queues : 1; |
| 1037 |
|
| 1038 |
n->multiqueue = multiqueue; |
| 1039 |
|
| 1040 |
for (i = 2; i <= n->max_queues * 2 + 1; i++) { |
| 1041 |
virtio_del_queue(vdev, i); |
| 1042 |
} |
| 1043 |
|
| 1044 |
for (i = 1; i < max; i++) { |
| 1045 |
n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
|
| 1046 |
if (n->vqs[i].tx_timer) {
|
| 1047 |
n->vqs[i].tx_vq = |
| 1048 |
virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
|
| 1049 |
n->vqs[i].tx_timer = qemu_new_timer_ns(vm_clock, |
| 1050 |
virtio_net_tx_timer, |
| 1051 |
&n->vqs[i]); |
| 1052 |
} else {
|
| 1053 |
n->vqs[i].tx_vq = |
| 1054 |
virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
|
| 1055 |
n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]); |
| 1056 |
} |
| 1057 |
|
| 1058 |
n->vqs[i].tx_waiting = 0;
|
| 1059 |
n->vqs[i].n = n; |
| 1060 |
} |
| 1061 |
|
| 1062 |
if (ctrl) {
|
| 1063 |
n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
|
| 1064 |
} |
| 1065 |
|
| 1066 |
virtio_net_set_queues(n); |
| 1067 |
} |
| 1068 |
|
| 1069 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
| 1070 |
{
|
| 1071 |
int i;
|
| 1072 |
VirtIONet *n = opaque; |
| 1073 |
|
| 1074 |
/* At this point, backend must be stopped, otherwise
|
| 1075 |
* it might keep writing to memory. */
|
| 1076 |
assert(!n->vhost_started); |
| 1077 |
virtio_save(&n->vdev, f); |
| 1078 |
|
| 1079 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
| 1080 |
qemu_put_be32(f, n->vqs[0].tx_waiting);
|
| 1081 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
| 1082 |
qemu_put_be16(f, n->status); |
| 1083 |
qemu_put_byte(f, n->promisc); |
| 1084 |
qemu_put_byte(f, n->allmulti); |
| 1085 |
qemu_put_be32(f, n->mac_table.in_use); |
| 1086 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
| 1087 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
| 1088 |
qemu_put_be32(f, n->has_vnet_hdr); |
| 1089 |
qemu_put_byte(f, n->mac_table.multi_overflow); |
| 1090 |
qemu_put_byte(f, n->mac_table.uni_overflow); |
| 1091 |
qemu_put_byte(f, n->alluni); |
| 1092 |
qemu_put_byte(f, n->nomulti); |
| 1093 |
qemu_put_byte(f, n->nouni); |
| 1094 |
qemu_put_byte(f, n->nobcast); |
| 1095 |
qemu_put_byte(f, n->has_ufo); |
| 1096 |
if (n->max_queues > 1) { |
| 1097 |
qemu_put_be16(f, n->max_queues); |
| 1098 |
qemu_put_be16(f, n->curr_queues); |
| 1099 |
for (i = 1; i < n->curr_queues; i++) { |
| 1100 |
qemu_put_be32(f, n->vqs[i].tx_waiting); |
| 1101 |
} |
| 1102 |
} |
| 1103 |
} |
| 1104 |
|
| 1105 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
| 1106 |
{
|
| 1107 |
VirtIONet *n = opaque; |
| 1108 |
int ret, i, link_down;
|
| 1109 |
|
| 1110 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
| 1111 |
return -EINVAL;
|
| 1112 |
|
| 1113 |
ret = virtio_load(&n->vdev, f); |
| 1114 |
if (ret) {
|
| 1115 |
return ret;
|
| 1116 |
} |
| 1117 |
|
| 1118 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
| 1119 |
n->vqs[0].tx_waiting = qemu_get_be32(f);
|
| 1120 |
|
| 1121 |
virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f)); |
| 1122 |
|
| 1123 |
if (version_id >= 3) |
| 1124 |
n->status = qemu_get_be16(f); |
| 1125 |
|
| 1126 |
if (version_id >= 4) { |
| 1127 |
if (version_id < 8) { |
| 1128 |
n->promisc = qemu_get_be32(f); |
| 1129 |
n->allmulti = qemu_get_be32(f); |
| 1130 |
} else {
|
| 1131 |
n->promisc = qemu_get_byte(f); |
| 1132 |
n->allmulti = qemu_get_byte(f); |
| 1133 |
} |
| 1134 |
} |
| 1135 |
|
| 1136 |
if (version_id >= 5) { |
| 1137 |
n->mac_table.in_use = qemu_get_be32(f); |
| 1138 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
| 1139 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
| 1140 |
qemu_get_buffer(f, n->mac_table.macs, |
| 1141 |
n->mac_table.in_use * ETH_ALEN); |
| 1142 |
} else if (n->mac_table.in_use) { |
| 1143 |
uint8_t *buf = g_malloc0(n->mac_table.in_use); |
| 1144 |
qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN); |
| 1145 |
g_free(buf); |
| 1146 |
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
| 1147 |
n->mac_table.in_use = 0;
|
| 1148 |
} |
| 1149 |
} |
| 1150 |
|
| 1151 |
if (version_id >= 6) |
| 1152 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
| 1153 |
|
| 1154 |
if (version_id >= 7) { |
| 1155 |
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
| 1156 |
error_report("virtio-net: saved image requires vnet_hdr=on");
|
| 1157 |
return -1; |
| 1158 |
} |
| 1159 |
|
| 1160 |
if (n->has_vnet_hdr) {
|
| 1161 |
tap_set_offload(qemu_get_queue(n->nic)->peer, |
| 1162 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
| 1163 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
| 1164 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
| 1165 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
| 1166 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
| 1167 |
} |
| 1168 |
} |
| 1169 |
|
| 1170 |
if (version_id >= 9) { |
| 1171 |
n->mac_table.multi_overflow = qemu_get_byte(f); |
| 1172 |
n->mac_table.uni_overflow = qemu_get_byte(f); |
| 1173 |
} |
| 1174 |
|
| 1175 |
if (version_id >= 10) { |
| 1176 |
n->alluni = qemu_get_byte(f); |
| 1177 |
n->nomulti = qemu_get_byte(f); |
| 1178 |
n->nouni = qemu_get_byte(f); |
| 1179 |
n->nobcast = qemu_get_byte(f); |
| 1180 |
} |
| 1181 |
|
| 1182 |
if (version_id >= 11) { |
| 1183 |
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
|
| 1184 |
error_report("virtio-net: saved image requires TUN_F_UFO support");
|
| 1185 |
return -1; |
| 1186 |
} |
| 1187 |
} |
| 1188 |
|
| 1189 |
if (n->max_queues > 1) { |
| 1190 |
if (n->max_queues != qemu_get_be16(f)) {
|
| 1191 |
error_report("virtio-net: different max_queues ");
|
| 1192 |
return -1; |
| 1193 |
} |
| 1194 |
|
| 1195 |
n->curr_queues = qemu_get_be16(f); |
| 1196 |
for (i = 1; i < n->curr_queues; i++) { |
| 1197 |
n->vqs[i].tx_waiting = qemu_get_be32(f); |
| 1198 |
} |
| 1199 |
} |
| 1200 |
|
| 1201 |
virtio_net_set_queues(n); |
| 1202 |
|
| 1203 |
/* Find the first multicast entry in the saved MAC filter */
|
| 1204 |
for (i = 0; i < n->mac_table.in_use; i++) { |
| 1205 |
if (n->mac_table.macs[i * ETH_ALEN] & 1) { |
| 1206 |
break;
|
| 1207 |
} |
| 1208 |
} |
| 1209 |
n->mac_table.first_multi = i; |
| 1210 |
|
| 1211 |
/* nc.link_down can't be migrated, so infer link_down according
|
| 1212 |
* to link status bit in n->status */
|
| 1213 |
link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
|
| 1214 |
for (i = 0; i < n->max_queues; i++) { |
| 1215 |
qemu_get_subqueue(n->nic, i)->link_down = link_down; |
| 1216 |
} |
| 1217 |
|
| 1218 |
return 0; |
| 1219 |
} |
| 1220 |
|
| 1221 |
static void virtio_net_cleanup(NetClientState *nc) |
| 1222 |
{
|
| 1223 |
VirtIONet *n = qemu_get_nic_opaque(nc); |
| 1224 |
|
| 1225 |
n->nic = NULL;
|
| 1226 |
} |
| 1227 |
|
| 1228 |
static NetClientInfo net_virtio_info = {
|
| 1229 |
.type = NET_CLIENT_OPTIONS_KIND_NIC, |
| 1230 |
.size = sizeof(NICState),
|
| 1231 |
.can_receive = virtio_net_can_receive, |
| 1232 |
.receive = virtio_net_receive, |
| 1233 |
.cleanup = virtio_net_cleanup, |
| 1234 |
.link_status_changed = virtio_net_set_link_status, |
| 1235 |
}; |
| 1236 |
|
| 1237 |
static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx) |
| 1238 |
{
|
| 1239 |
VirtIONet *n = to_virtio_net(vdev); |
| 1240 |
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); |
| 1241 |
assert(n->vhost_started); |
| 1242 |
return vhost_net_virtqueue_pending(tap_get_vhost_net(nc->peer), idx);
|
| 1243 |
} |
| 1244 |
|
| 1245 |
static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx, |
| 1246 |
bool mask)
|
| 1247 |
{
|
| 1248 |
VirtIONet *n = to_virtio_net(vdev); |
| 1249 |
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx)); |
| 1250 |
assert(n->vhost_started); |
| 1251 |
vhost_net_virtqueue_mask(tap_get_vhost_net(nc->peer), |
| 1252 |
vdev, idx, mask); |
| 1253 |
} |
| 1254 |
|
| 1255 |
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf, |
| 1256 |
virtio_net_conf *net, uint32_t host_features) |
| 1257 |
{
|
| 1258 |
VirtIONet *n; |
| 1259 |
int i, config_size = 0; |
| 1260 |
|
| 1261 |
for (i = 0; feature_sizes[i].flags != 0; i++) { |
| 1262 |
if (host_features & feature_sizes[i].flags) {
|
| 1263 |
config_size = MAX(feature_sizes[i].end, config_size); |
| 1264 |
} |
| 1265 |
} |
| 1266 |
|
| 1267 |
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
| 1268 |
config_size, sizeof(VirtIONet));
|
| 1269 |
|
| 1270 |
n->config_size = config_size; |
| 1271 |
n->vdev.get_config = virtio_net_get_config; |
| 1272 |
n->vdev.set_config = virtio_net_set_config; |
| 1273 |
n->vdev.get_features = virtio_net_get_features; |
| 1274 |
n->vdev.set_features = virtio_net_set_features; |
| 1275 |
n->vdev.bad_features = virtio_net_bad_features; |
| 1276 |
n->vdev.reset = virtio_net_reset; |
| 1277 |
n->vdev.set_status = virtio_net_set_status; |
| 1278 |
n->vdev.guest_notifier_mask = virtio_net_guest_notifier_mask; |
| 1279 |
n->vdev.guest_notifier_pending = virtio_net_guest_notifier_pending; |
| 1280 |
n->max_queues = MAX(conf->queues, 1);
|
| 1281 |
n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
|
| 1282 |
n->vqs[0].rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx); |
| 1283 |
n->curr_queues = 1;
|
| 1284 |
n->vqs[0].n = n;
|
| 1285 |
n->tx_timeout = net->txtimer; |
| 1286 |
|
| 1287 |
if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) { |
| 1288 |
error_report("virtio-net: "
|
| 1289 |
"Unknown option tx=%s, valid options: \"timer\" \"bh\"",
|
| 1290 |
net->tx); |
| 1291 |
error_report("Defaulting to \"bh\"");
|
| 1292 |
} |
| 1293 |
|
| 1294 |
if (net->tx && !strcmp(net->tx, "timer")) { |
| 1295 |
n->vqs[0].tx_vq = virtio_add_queue(&n->vdev, 256, |
| 1296 |
virtio_net_handle_tx_timer); |
| 1297 |
n->vqs[0].tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer,
|
| 1298 |
&n->vqs[0]);
|
| 1299 |
} else {
|
| 1300 |
n->vqs[0].tx_vq = virtio_add_queue(&n->vdev, 256, |
| 1301 |
virtio_net_handle_tx_bh); |
| 1302 |
n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]); |
| 1303 |
} |
| 1304 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
| 1305 |
qemu_macaddr_default_if_unset(&conf->macaddr); |
| 1306 |
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); |
| 1307 |
n->status = VIRTIO_NET_S_LINK_UP; |
| 1308 |
|
| 1309 |
n->nic = qemu_new_nic(&net_virtio_info, conf, object_get_typename(OBJECT(dev)), dev->id, n); |
| 1310 |
peer_test_vnet_hdr(n); |
| 1311 |
if (peer_has_vnet_hdr(n)) {
|
| 1312 |
for (i = 0; i < n->max_queues; i++) { |
| 1313 |
tap_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
|
| 1314 |
} |
| 1315 |
n->host_hdr_len = sizeof(struct virtio_net_hdr); |
| 1316 |
} else {
|
| 1317 |
n->host_hdr_len = 0;
|
| 1318 |
} |
| 1319 |
|
| 1320 |
qemu_format_nic_info_str(qemu_get_queue(n->nic), conf->macaddr.a); |
| 1321 |
|
| 1322 |
n->vqs[0].tx_waiting = 0; |
| 1323 |
n->tx_burst = net->txburst; |
| 1324 |
virtio_net_set_mrg_rx_bufs(n, 0);
|
| 1325 |
n->promisc = 1; /* for compatibility */ |
| 1326 |
|
| 1327 |
n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN); |
| 1328 |
|
| 1329 |
n->vlans = g_malloc0(MAX_VLAN >> 3);
|
| 1330 |
|
| 1331 |
n->qdev = dev; |
| 1332 |
register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, |
| 1333 |
virtio_net_save, virtio_net_load, n); |
| 1334 |
|
| 1335 |
add_boot_device_path(conf->bootindex, dev, "/ethernet-phy@0");
|
| 1336 |
|
| 1337 |
return &n->vdev;
|
| 1338 |
} |
| 1339 |
|
| 1340 |
void virtio_net_exit(VirtIODevice *vdev)
|
| 1341 |
{
|
| 1342 |
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); |
| 1343 |
int i;
|
| 1344 |
|
| 1345 |
/* This will stop vhost backend if appropriate. */
|
| 1346 |
virtio_net_set_status(vdev, 0);
|
| 1347 |
|
| 1348 |
unregister_savevm(n->qdev, "virtio-net", n);
|
| 1349 |
|
| 1350 |
g_free(n->mac_table.macs); |
| 1351 |
g_free(n->vlans); |
| 1352 |
|
| 1353 |
for (i = 0; i < n->max_queues; i++) { |
| 1354 |
VirtIONetQueue *q = &n->vqs[i]; |
| 1355 |
NetClientState *nc = qemu_get_subqueue(n->nic, i); |
| 1356 |
|
| 1357 |
qemu_purge_queued_packets(nc); |
| 1358 |
|
| 1359 |
if (q->tx_timer) {
|
| 1360 |
qemu_del_timer(q->tx_timer); |
| 1361 |
qemu_free_timer(q->tx_timer); |
| 1362 |
} else {
|
| 1363 |
qemu_bh_delete(q->tx_bh); |
| 1364 |
} |
| 1365 |
} |
| 1366 |
|
| 1367 |
g_free(n->vqs); |
| 1368 |
qemu_del_nic(n->nic); |
| 1369 |
virtio_cleanup(&n->vdev); |
| 1370 |
} |