root / hw / virtio-net.c @ 8172539d
History | View | Annotate | Download (25.1 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 "virtio.h" |
15 |
#include "net.h" |
16 |
#include "net/checksum.h" |
17 |
#include "net/tap.h" |
18 |
#include "qemu-timer.h" |
19 |
#include "virtio-net.h" |
20 |
|
21 |
#define VIRTIO_NET_VM_VERSION 11 |
22 |
|
23 |
#define MAC_TABLE_ENTRIES 64 |
24 |
#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */ |
25 |
|
26 |
typedef struct VirtIONet |
27 |
{ |
28 |
VirtIODevice vdev; |
29 |
uint8_t mac[ETH_ALEN]; |
30 |
uint16_t status; |
31 |
VirtQueue *rx_vq; |
32 |
VirtQueue *tx_vq; |
33 |
VirtQueue *ctrl_vq; |
34 |
NICState *nic; |
35 |
QEMUTimer *tx_timer; |
36 |
int tx_timer_active;
|
37 |
uint32_t has_vnet_hdr; |
38 |
uint8_t has_ufo; |
39 |
struct {
|
40 |
VirtQueueElement elem; |
41 |
ssize_t len; |
42 |
} async_tx; |
43 |
int mergeable_rx_bufs;
|
44 |
uint8_t promisc; |
45 |
uint8_t allmulti; |
46 |
uint8_t alluni; |
47 |
uint8_t nomulti; |
48 |
uint8_t nouni; |
49 |
uint8_t nobcast; |
50 |
struct {
|
51 |
int in_use;
|
52 |
int first_multi;
|
53 |
uint8_t multi_overflow; |
54 |
uint8_t uni_overflow; |
55 |
uint8_t *macs; |
56 |
} mac_table; |
57 |
uint32_t *vlans; |
58 |
} VirtIONet; |
59 |
|
60 |
/* TODO
|
61 |
* - we could suppress RX interrupt if we were so inclined.
|
62 |
*/
|
63 |
|
64 |
static VirtIONet *to_virtio_net(VirtIODevice *vdev)
|
65 |
{ |
66 |
return (VirtIONet *)vdev;
|
67 |
} |
68 |
|
69 |
static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) |
70 |
{ |
71 |
VirtIONet *n = to_virtio_net(vdev); |
72 |
struct virtio_net_config netcfg;
|
73 |
|
74 |
netcfg.status = n->status; |
75 |
memcpy(netcfg.mac, n->mac, ETH_ALEN); |
76 |
memcpy(config, &netcfg, sizeof(netcfg));
|
77 |
} |
78 |
|
79 |
static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) |
80 |
{ |
81 |
VirtIONet *n = to_virtio_net(vdev); |
82 |
struct virtio_net_config netcfg;
|
83 |
|
84 |
memcpy(&netcfg, config, sizeof(netcfg));
|
85 |
|
86 |
if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
|
87 |
memcpy(n->mac, netcfg.mac, ETH_ALEN); |
88 |
qemu_format_nic_info_str(&n->nic->nc, n->mac); |
89 |
} |
90 |
} |
91 |
|
92 |
static void virtio_net_set_link_status(VLANClientState *nc) |
93 |
{ |
94 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
95 |
uint16_t old_status = n->status; |
96 |
|
97 |
if (nc->link_down)
|
98 |
n->status &= ~VIRTIO_NET_S_LINK_UP; |
99 |
else
|
100 |
n->status |= VIRTIO_NET_S_LINK_UP; |
101 |
|
102 |
if (n->status != old_status)
|
103 |
virtio_notify_config(&n->vdev); |
104 |
} |
105 |
|
106 |
static void virtio_net_reset(VirtIODevice *vdev) |
107 |
{ |
108 |
VirtIONet *n = to_virtio_net(vdev); |
109 |
|
110 |
/* Reset back to compatibility mode */
|
111 |
n->promisc = 1;
|
112 |
n->allmulti = 0;
|
113 |
n->alluni = 0;
|
114 |
n->nomulti = 0;
|
115 |
n->nouni = 0;
|
116 |
n->nobcast = 0;
|
117 |
|
118 |
/* Flush any MAC and VLAN filter table state */
|
119 |
n->mac_table.in_use = 0;
|
120 |
n->mac_table.first_multi = 0;
|
121 |
n->mac_table.multi_overflow = 0;
|
122 |
n->mac_table.uni_overflow = 0;
|
123 |
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
|
124 |
memset(n->vlans, 0, MAX_VLAN >> 3); |
125 |
} |
126 |
|
127 |
static int peer_has_vnet_hdr(VirtIONet *n) |
128 |
{ |
129 |
if (!n->nic->nc.peer)
|
130 |
return 0; |
131 |
|
132 |
if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP)
|
133 |
return 0; |
134 |
|
135 |
n->has_vnet_hdr = tap_has_vnet_hdr(n->nic->nc.peer); |
136 |
|
137 |
return n->has_vnet_hdr;
|
138 |
} |
139 |
|
140 |
static int peer_has_ufo(VirtIONet *n) |
141 |
{ |
142 |
if (!peer_has_vnet_hdr(n))
|
143 |
return 0; |
144 |
|
145 |
n->has_ufo = tap_has_ufo(n->nic->nc.peer); |
146 |
|
147 |
return n->has_ufo;
|
148 |
} |
149 |
|
150 |
static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
|
151 |
{ |
152 |
VirtIONet *n = to_virtio_net(vdev); |
153 |
|
154 |
if (peer_has_vnet_hdr(n)) {
|
155 |
tap_using_vnet_hdr(n->nic->nc.peer, 1);
|
156 |
} else {
|
157 |
features &= ~(0x1 << VIRTIO_NET_F_CSUM);
|
158 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4);
|
159 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6);
|
160 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN);
|
161 |
|
162 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM);
|
163 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4);
|
164 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6);
|
165 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN);
|
166 |
} |
167 |
|
168 |
if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
|
169 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO);
|
170 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO);
|
171 |
} |
172 |
|
173 |
return features;
|
174 |
} |
175 |
|
176 |
static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
|
177 |
{ |
178 |
uint32_t features = 0;
|
179 |
|
180 |
/* Linux kernel 2.6.25. It understood MAC (as everyone must),
|
181 |
* but also these: */
|
182 |
features |= (1 << VIRTIO_NET_F_MAC);
|
183 |
features |= (1 << VIRTIO_NET_F_CSUM);
|
184 |
features |= (1 << VIRTIO_NET_F_HOST_TSO4);
|
185 |
features |= (1 << VIRTIO_NET_F_HOST_TSO6);
|
186 |
features |= (1 << VIRTIO_NET_F_HOST_ECN);
|
187 |
|
188 |
return features;
|
189 |
} |
190 |
|
191 |
static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) |
192 |
{ |
193 |
VirtIONet *n = to_virtio_net(vdev); |
194 |
|
195 |
n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
|
196 |
|
197 |
if (n->has_vnet_hdr) {
|
198 |
tap_set_offload(n->nic->nc.peer, |
199 |
(features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
200 |
(features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
201 |
(features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
202 |
(features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
203 |
(features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
204 |
} |
205 |
} |
206 |
|
207 |
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, |
208 |
VirtQueueElement *elem) |
209 |
{ |
210 |
uint8_t on; |
211 |
|
212 |
if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) { |
213 |
fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
|
214 |
exit(1);
|
215 |
} |
216 |
|
217 |
on = ldub_p(elem->out_sg[1].iov_base);
|
218 |
|
219 |
if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
|
220 |
n->promisc = on; |
221 |
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI) |
222 |
n->allmulti = on; |
223 |
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLUNI) |
224 |
n->alluni = on; |
225 |
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOMULTI) |
226 |
n->nomulti = on; |
227 |
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOUNI) |
228 |
n->nouni = on; |
229 |
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOBCAST) |
230 |
n->nobcast = on; |
231 |
else
|
232 |
return VIRTIO_NET_ERR;
|
233 |
|
234 |
return VIRTIO_NET_OK;
|
235 |
} |
236 |
|
237 |
static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, |
238 |
VirtQueueElement *elem) |
239 |
{ |
240 |
struct virtio_net_ctrl_mac mac_data;
|
241 |
|
242 |
if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 || |
243 |
elem->out_sg[1].iov_len < sizeof(mac_data) || |
244 |
elem->out_sg[2].iov_len < sizeof(mac_data)) |
245 |
return VIRTIO_NET_ERR;
|
246 |
|
247 |
n->mac_table.in_use = 0;
|
248 |
n->mac_table.first_multi = 0;
|
249 |
n->mac_table.uni_overflow = 0;
|
250 |
n->mac_table.multi_overflow = 0;
|
251 |
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
|
252 |
|
253 |
mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
|
254 |
|
255 |
if (sizeof(mac_data.entries) + |
256 |
(mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
|
257 |
return VIRTIO_NET_ERR;
|
258 |
|
259 |
if (mac_data.entries <= MAC_TABLE_ENTRIES) {
|
260 |
memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data), |
261 |
mac_data.entries * ETH_ALEN); |
262 |
n->mac_table.in_use += mac_data.entries; |
263 |
} else {
|
264 |
n->mac_table.uni_overflow = 1;
|
265 |
} |
266 |
|
267 |
n->mac_table.first_multi = n->mac_table.in_use; |
268 |
|
269 |
mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
|
270 |
|
271 |
if (sizeof(mac_data.entries) + |
272 |
(mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
|
273 |
return VIRTIO_NET_ERR;
|
274 |
|
275 |
if (mac_data.entries) {
|
276 |
if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
|
277 |
memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN), |
278 |
elem->out_sg[2].iov_base + sizeof(mac_data), |
279 |
mac_data.entries * ETH_ALEN); |
280 |
n->mac_table.in_use += mac_data.entries; |
281 |
} else {
|
282 |
n->mac_table.multi_overflow = 1;
|
283 |
} |
284 |
} |
285 |
|
286 |
return VIRTIO_NET_OK;
|
287 |
} |
288 |
|
289 |
static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, |
290 |
VirtQueueElement *elem) |
291 |
{ |
292 |
uint16_t vid; |
293 |
|
294 |
if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) { |
295 |
fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
|
296 |
return VIRTIO_NET_ERR;
|
297 |
} |
298 |
|
299 |
vid = lduw_le_p(elem->out_sg[1].iov_base);
|
300 |
|
301 |
if (vid >= MAX_VLAN)
|
302 |
return VIRTIO_NET_ERR;
|
303 |
|
304 |
if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
|
305 |
n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); |
306 |
else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) |
307 |
n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); |
308 |
else
|
309 |
return VIRTIO_NET_ERR;
|
310 |
|
311 |
return VIRTIO_NET_OK;
|
312 |
} |
313 |
|
314 |
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
315 |
{ |
316 |
VirtIONet *n = to_virtio_net(vdev); |
317 |
struct virtio_net_ctrl_hdr ctrl;
|
318 |
virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
319 |
VirtQueueElement elem; |
320 |
|
321 |
while (virtqueue_pop(vq, &elem)) {
|
322 |
if ((elem.in_num < 1) || (elem.out_num < 1)) { |
323 |
fprintf(stderr, "virtio-net ctrl missing headers\n");
|
324 |
exit(1);
|
325 |
} |
326 |
|
327 |
if (elem.out_sg[0].iov_len < sizeof(ctrl) || |
328 |
elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) { |
329 |
fprintf(stderr, "virtio-net ctrl header not in correct element\n");
|
330 |
exit(1);
|
331 |
} |
332 |
|
333 |
ctrl.class = ldub_p(elem.out_sg[0].iov_base);
|
334 |
ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class)); |
335 |
|
336 |
if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
|
337 |
status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem); |
338 |
else if (ctrl.class == VIRTIO_NET_CTRL_MAC) |
339 |
status = virtio_net_handle_mac(n, ctrl.cmd, &elem); |
340 |
else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) |
341 |
status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem); |
342 |
|
343 |
stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
|
344 |
|
345 |
virtqueue_push(vq, &elem, sizeof(status));
|
346 |
virtio_notify(vdev, vq); |
347 |
} |
348 |
} |
349 |
|
350 |
/* RX */
|
351 |
|
352 |
static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
353 |
{ |
354 |
VirtIONet *n = to_virtio_net(vdev); |
355 |
|
356 |
qemu_flush_queued_packets(&n->nic->nc); |
357 |
|
358 |
/* We now have RX buffers, signal to the IO thread to break out of the
|
359 |
* select to re-poll the tap file descriptor */
|
360 |
qemu_notify_event(); |
361 |
} |
362 |
|
363 |
static int virtio_net_can_receive(VLANClientState *nc) |
364 |
{ |
365 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
366 |
|
367 |
if (!virtio_queue_ready(n->rx_vq) ||
|
368 |
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) |
369 |
return 0; |
370 |
|
371 |
return 1; |
372 |
} |
373 |
|
374 |
static int virtio_net_has_buffers(VirtIONet *n, int bufsize) |
375 |
{ |
376 |
if (virtio_queue_empty(n->rx_vq) ||
|
377 |
(n->mergeable_rx_bufs && |
378 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
|
379 |
virtio_queue_set_notification(n->rx_vq, 1);
|
380 |
return 0; |
381 |
} |
382 |
|
383 |
virtio_queue_set_notification(n->rx_vq, 0);
|
384 |
return 1; |
385 |
} |
386 |
|
387 |
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
388 |
* it never finds out that the packets don't have valid checksums. This
|
389 |
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
390 |
* fix this with Xen but it hasn't appeared in an upstream release of
|
391 |
* dhclient yet.
|
392 |
*
|
393 |
* To avoid breaking existing guests, we catch udp packets and add
|
394 |
* checksums. This is terrible but it's better than hacking the guest
|
395 |
* kernels.
|
396 |
*
|
397 |
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
398 |
* we should provide a mechanism to disable it to avoid polluting the host
|
399 |
* cache.
|
400 |
*/
|
401 |
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, |
402 |
const uint8_t *buf, size_t size)
|
403 |
{ |
404 |
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ |
405 |
(size > 27 && size < 1500) && /* normal sized MTU */ |
406 |
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ |
407 |
(buf[23] == 17) && /* ip.protocol == UDP */ |
408 |
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ |
409 |
/* FIXME this cast is evil */
|
410 |
net_checksum_calculate((uint8_t *)buf, size); |
411 |
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; |
412 |
} |
413 |
} |
414 |
|
415 |
static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count) |
416 |
{ |
417 |
int offset, i;
|
418 |
|
419 |
offset = i = 0;
|
420 |
while (offset < count && i < iovcnt) {
|
421 |
int len = MIN(iov[i].iov_len, count - offset);
|
422 |
memcpy(iov[i].iov_base, buf + offset, len); |
423 |
offset += len; |
424 |
i++; |
425 |
} |
426 |
|
427 |
return offset;
|
428 |
} |
429 |
|
430 |
static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt, |
431 |
const void *buf, size_t size, size_t hdr_len) |
432 |
{ |
433 |
struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base; |
434 |
int offset = 0; |
435 |
|
436 |
hdr->flags = 0;
|
437 |
hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; |
438 |
|
439 |
if (n->has_vnet_hdr) {
|
440 |
memcpy(hdr, buf, sizeof(*hdr));
|
441 |
offset = sizeof(*hdr);
|
442 |
work_around_broken_dhclient(hdr, buf + offset, size - offset); |
443 |
} |
444 |
|
445 |
/* We only ever receive a struct virtio_net_hdr from the tapfd,
|
446 |
* but we may be passing along a larger header to the guest.
|
447 |
*/
|
448 |
iov[0].iov_base += hdr_len;
|
449 |
iov[0].iov_len -= hdr_len;
|
450 |
|
451 |
return offset;
|
452 |
} |
453 |
|
454 |
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
455 |
{ |
456 |
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
457 |
static const uint8_t vlan[] = {0x81, 0x00}; |
458 |
uint8_t *ptr = (uint8_t *)buf; |
459 |
int i;
|
460 |
|
461 |
if (n->promisc)
|
462 |
return 1; |
463 |
|
464 |
if (n->has_vnet_hdr) {
|
465 |
ptr += sizeof(struct virtio_net_hdr); |
466 |
} |
467 |
|
468 |
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
469 |
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
470 |
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
471 |
return 0; |
472 |
} |
473 |
|
474 |
if (ptr[0] & 1) { // multicast |
475 |
if (!memcmp(ptr, bcast, sizeof(bcast))) { |
476 |
return !n->nobcast;
|
477 |
} else if (n->nomulti) { |
478 |
return 0; |
479 |
} else if (n->allmulti || n->mac_table.multi_overflow) { |
480 |
return 1; |
481 |
} |
482 |
|
483 |
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
484 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
485 |
return 1; |
486 |
} |
487 |
} |
488 |
} else { // unicast |
489 |
if (n->nouni) {
|
490 |
return 0; |
491 |
} else if (n->alluni || n->mac_table.uni_overflow) { |
492 |
return 1; |
493 |
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) { |
494 |
return 1; |
495 |
} |
496 |
|
497 |
for (i = 0; i < n->mac_table.first_multi; i++) { |
498 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
499 |
return 1; |
500 |
} |
501 |
} |
502 |
} |
503 |
|
504 |
return 0; |
505 |
} |
506 |
|
507 |
static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_t size) |
508 |
{ |
509 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
510 |
struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL; |
511 |
size_t hdr_len, offset, i; |
512 |
|
513 |
if (!virtio_net_can_receive(&n->nic->nc))
|
514 |
return -1; |
515 |
|
516 |
if (!virtio_net_has_buffers(n, size))
|
517 |
return 0; |
518 |
|
519 |
if (!receive_filter(n, buf, size))
|
520 |
return size;
|
521 |
|
522 |
/* hdr_len refers to the header we supply to the guest */
|
523 |
hdr_len = n->mergeable_rx_bufs ? |
524 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); |
525 |
|
526 |
offset = i = 0;
|
527 |
|
528 |
while (offset < size) {
|
529 |
VirtQueueElement elem; |
530 |
int len, total;
|
531 |
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
532 |
|
533 |
len = total = 0;
|
534 |
|
535 |
if ((i != 0 && !n->mergeable_rx_bufs) || |
536 |
virtqueue_pop(n->rx_vq, &elem) == 0) {
|
537 |
if (i == 0) |
538 |
return -1; |
539 |
fprintf(stderr, "virtio-net truncating packet\n");
|
540 |
exit(1);
|
541 |
} |
542 |
|
543 |
if (elem.in_num < 1) { |
544 |
fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
|
545 |
exit(1);
|
546 |
} |
547 |
|
548 |
if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) { |
549 |
fprintf(stderr, "virtio-net header not in first element\n");
|
550 |
exit(1);
|
551 |
} |
552 |
|
553 |
memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num); |
554 |
|
555 |
if (i == 0) { |
556 |
if (n->mergeable_rx_bufs)
|
557 |
mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base; |
558 |
|
559 |
offset += receive_header(n, sg, elem.in_num, |
560 |
buf + offset, size - offset, hdr_len); |
561 |
total += hdr_len; |
562 |
} |
563 |
|
564 |
/* copy in packet. ugh */
|
565 |
len = iov_fill(sg, elem.in_num, |
566 |
buf + offset, size - offset); |
567 |
total += len; |
568 |
|
569 |
/* signal other side */
|
570 |
virtqueue_fill(n->rx_vq, &elem, total, i++); |
571 |
|
572 |
offset += len; |
573 |
} |
574 |
|
575 |
if (mhdr)
|
576 |
mhdr->num_buffers = i; |
577 |
|
578 |
virtqueue_flush(n->rx_vq, i); |
579 |
virtio_notify(&n->vdev, n->rx_vq); |
580 |
|
581 |
return size;
|
582 |
} |
583 |
|
584 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq); |
585 |
|
586 |
static void virtio_net_tx_complete(VLANClientState *nc, ssize_t len) |
587 |
{ |
588 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
589 |
|
590 |
virtqueue_push(n->tx_vq, &n->async_tx.elem, n->async_tx.len); |
591 |
virtio_notify(&n->vdev, n->tx_vq); |
592 |
|
593 |
n->async_tx.elem.out_num = n->async_tx.len = 0;
|
594 |
|
595 |
virtio_queue_set_notification(n->tx_vq, 1);
|
596 |
virtio_net_flush_tx(n, n->tx_vq); |
597 |
} |
598 |
|
599 |
/* TX */
|
600 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq) |
601 |
{ |
602 |
VirtQueueElement elem; |
603 |
|
604 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
605 |
return;
|
606 |
|
607 |
if (n->async_tx.elem.out_num) {
|
608 |
virtio_queue_set_notification(n->tx_vq, 0);
|
609 |
return;
|
610 |
} |
611 |
|
612 |
while (virtqueue_pop(vq, &elem)) {
|
613 |
ssize_t ret, len = 0;
|
614 |
unsigned int out_num = elem.out_num; |
615 |
struct iovec *out_sg = &elem.out_sg[0]; |
616 |
unsigned hdr_len;
|
617 |
|
618 |
/* hdr_len refers to the header received from the guest */
|
619 |
hdr_len = n->mergeable_rx_bufs ? |
620 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
621 |
sizeof(struct virtio_net_hdr); |
622 |
|
623 |
if (out_num < 1 || out_sg->iov_len != hdr_len) { |
624 |
fprintf(stderr, "virtio-net header not in first element\n");
|
625 |
exit(1);
|
626 |
} |
627 |
|
628 |
/* ignore the header if GSO is not supported */
|
629 |
if (!n->has_vnet_hdr) {
|
630 |
out_num--; |
631 |
out_sg++; |
632 |
len += hdr_len; |
633 |
} else if (n->mergeable_rx_bufs) { |
634 |
/* tapfd expects a struct virtio_net_hdr */
|
635 |
hdr_len -= sizeof(struct virtio_net_hdr); |
636 |
out_sg->iov_len -= hdr_len; |
637 |
len += hdr_len; |
638 |
} |
639 |
|
640 |
ret = qemu_sendv_packet_async(&n->nic->nc, out_sg, out_num, |
641 |
virtio_net_tx_complete); |
642 |
if (ret == 0) { |
643 |
virtio_queue_set_notification(n->tx_vq, 0);
|
644 |
n->async_tx.elem = elem; |
645 |
n->async_tx.len = len; |
646 |
return;
|
647 |
} |
648 |
|
649 |
len += ret; |
650 |
|
651 |
virtqueue_push(vq, &elem, len); |
652 |
virtio_notify(&n->vdev, vq); |
653 |
} |
654 |
} |
655 |
|
656 |
static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq) |
657 |
{ |
658 |
VirtIONet *n = to_virtio_net(vdev); |
659 |
|
660 |
if (n->tx_timer_active) {
|
661 |
virtio_queue_set_notification(vq, 1);
|
662 |
qemu_del_timer(n->tx_timer); |
663 |
n->tx_timer_active = 0;
|
664 |
virtio_net_flush_tx(n, vq); |
665 |
} else {
|
666 |
qemu_mod_timer(n->tx_timer, |
667 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
668 |
n->tx_timer_active = 1;
|
669 |
virtio_queue_set_notification(vq, 0);
|
670 |
} |
671 |
} |
672 |
|
673 |
static void virtio_net_tx_timer(void *opaque) |
674 |
{ |
675 |
VirtIONet *n = opaque; |
676 |
|
677 |
n->tx_timer_active = 0;
|
678 |
|
679 |
/* Just in case the driver is not ready on more */
|
680 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
681 |
return;
|
682 |
|
683 |
virtio_queue_set_notification(n->tx_vq, 1);
|
684 |
virtio_net_flush_tx(n, n->tx_vq); |
685 |
} |
686 |
|
687 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
688 |
{ |
689 |
VirtIONet *n = opaque; |
690 |
|
691 |
virtio_save(&n->vdev, f); |
692 |
|
693 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
694 |
qemu_put_be32(f, n->tx_timer_active); |
695 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
696 |
qemu_put_be16(f, n->status); |
697 |
qemu_put_byte(f, n->promisc); |
698 |
qemu_put_byte(f, n->allmulti); |
699 |
qemu_put_be32(f, n->mac_table.in_use); |
700 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
701 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
702 |
qemu_put_be32(f, n->has_vnet_hdr); |
703 |
qemu_put_byte(f, n->mac_table.multi_overflow); |
704 |
qemu_put_byte(f, n->mac_table.uni_overflow); |
705 |
qemu_put_byte(f, n->alluni); |
706 |
qemu_put_byte(f, n->nomulti); |
707 |
qemu_put_byte(f, n->nouni); |
708 |
qemu_put_byte(f, n->nobcast); |
709 |
qemu_put_byte(f, n->has_ufo); |
710 |
} |
711 |
|
712 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
713 |
{ |
714 |
VirtIONet *n = opaque; |
715 |
int i;
|
716 |
|
717 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
718 |
return -EINVAL;
|
719 |
|
720 |
virtio_load(&n->vdev, f); |
721 |
|
722 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
723 |
n->tx_timer_active = qemu_get_be32(f); |
724 |
n->mergeable_rx_bufs = qemu_get_be32(f); |
725 |
|
726 |
if (version_id >= 3) |
727 |
n->status = qemu_get_be16(f); |
728 |
|
729 |
if (version_id >= 4) { |
730 |
if (version_id < 8) { |
731 |
n->promisc = qemu_get_be32(f); |
732 |
n->allmulti = qemu_get_be32(f); |
733 |
} else {
|
734 |
n->promisc = qemu_get_byte(f); |
735 |
n->allmulti = qemu_get_byte(f); |
736 |
} |
737 |
} |
738 |
|
739 |
if (version_id >= 5) { |
740 |
n->mac_table.in_use = qemu_get_be32(f); |
741 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
742 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
743 |
qemu_get_buffer(f, n->mac_table.macs, |
744 |
n->mac_table.in_use * ETH_ALEN); |
745 |
} else if (n->mac_table.in_use) { |
746 |
qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR); |
747 |
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
748 |
n->mac_table.in_use = 0;
|
749 |
} |
750 |
} |
751 |
|
752 |
if (version_id >= 6) |
753 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
754 |
|
755 |
if (version_id >= 7) { |
756 |
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
757 |
qemu_error("virtio-net: saved image requires vnet_hdr=on\n");
|
758 |
return -1; |
759 |
} |
760 |
|
761 |
if (n->has_vnet_hdr) {
|
762 |
tap_using_vnet_hdr(n->nic->nc.peer, 1);
|
763 |
tap_set_offload(n->nic->nc.peer, |
764 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
765 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
766 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
767 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
768 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
769 |
} |
770 |
} |
771 |
|
772 |
if (version_id >= 9) { |
773 |
n->mac_table.multi_overflow = qemu_get_byte(f); |
774 |
n->mac_table.uni_overflow = qemu_get_byte(f); |
775 |
} |
776 |
|
777 |
if (version_id >= 10) { |
778 |
n->alluni = qemu_get_byte(f); |
779 |
n->nomulti = qemu_get_byte(f); |
780 |
n->nouni = qemu_get_byte(f); |
781 |
n->nobcast = qemu_get_byte(f); |
782 |
} |
783 |
|
784 |
if (version_id >= 11) { |
785 |
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
|
786 |
qemu_error("virtio-net: saved image requires TUN_F_UFO support\n");
|
787 |
return -1; |
788 |
} |
789 |
} |
790 |
|
791 |
/* Find the first multicast entry in the saved MAC filter */
|
792 |
for (i = 0; i < n->mac_table.in_use; i++) { |
793 |
if (n->mac_table.macs[i * ETH_ALEN] & 1) { |
794 |
break;
|
795 |
} |
796 |
} |
797 |
n->mac_table.first_multi = i; |
798 |
|
799 |
if (n->tx_timer_active) {
|
800 |
qemu_mod_timer(n->tx_timer, |
801 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
802 |
} |
803 |
|
804 |
return 0; |
805 |
} |
806 |
|
807 |
static void virtio_net_cleanup(VLANClientState *nc) |
808 |
{ |
809 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
810 |
|
811 |
n->nic = NULL;
|
812 |
} |
813 |
|
814 |
static NetClientInfo net_virtio_info = {
|
815 |
.type = NET_CLIENT_TYPE_NIC, |
816 |
.size = sizeof(NICState),
|
817 |
.can_receive = virtio_net_can_receive, |
818 |
.receive = virtio_net_receive, |
819 |
.cleanup = virtio_net_cleanup, |
820 |
.link_status_changed = virtio_net_set_link_status, |
821 |
}; |
822 |
|
823 |
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf) |
824 |
{ |
825 |
VirtIONet *n; |
826 |
static int virtio_net_id; |
827 |
|
828 |
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
829 |
sizeof(struct virtio_net_config), |
830 |
sizeof(VirtIONet));
|
831 |
|
832 |
n->vdev.get_config = virtio_net_get_config; |
833 |
n->vdev.set_config = virtio_net_set_config; |
834 |
n->vdev.get_features = virtio_net_get_features; |
835 |
n->vdev.set_features = virtio_net_set_features; |
836 |
n->vdev.bad_features = virtio_net_bad_features; |
837 |
n->vdev.reset = virtio_net_reset; |
838 |
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
|
839 |
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
|
840 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
841 |
qemu_macaddr_default_if_unset(&conf->macaddr); |
842 |
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); |
843 |
n->status = VIRTIO_NET_S_LINK_UP; |
844 |
|
845 |
n->nic = qemu_new_nic(&net_virtio_info, conf, dev->info->name, dev->id, n); |
846 |
|
847 |
qemu_format_nic_info_str(&n->nic->nc, conf->macaddr.a); |
848 |
|
849 |
n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n); |
850 |
n->tx_timer_active = 0;
|
851 |
n->mergeable_rx_bufs = 0;
|
852 |
n->promisc = 1; /* for compatibility */ |
853 |
|
854 |
n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN); |
855 |
|
856 |
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
|
857 |
|
858 |
register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
|
859 |
virtio_net_save, virtio_net_load, n); |
860 |
|
861 |
return &n->vdev;
|
862 |
} |
863 |
|
864 |
void virtio_net_exit(VirtIODevice *vdev)
|
865 |
{ |
866 |
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); |
867 |
|
868 |
qemu_purge_queued_packets(&n->nic->nc); |
869 |
|
870 |
unregister_savevm("virtio-net", n);
|
871 |
|
872 |
qemu_free(n->mac_table.macs); |
873 |
qemu_free(n->vlans); |
874 |
|
875 |
qemu_del_timer(n->tx_timer); |
876 |
qemu_free_timer(n->tx_timer); |
877 |
|
878 |
virtio_cleanup(&n->vdev); |
879 |
qemu_del_vlan_client(&n->nic->nc); |
880 |
} |