root / hw / virtio-net.c @ 804b2071
History | View | Annotate | Download (28.5 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 "iov.h" |
15 |
#include "virtio.h" |
16 |
#include "net.h" |
17 |
#include "net/checksum.h" |
18 |
#include "net/tap.h" |
19 |
#include "qemu-error.h" |
20 |
#include "qemu-timer.h" |
21 |
#include "virtio-net.h" |
22 |
#include "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 |
typedef struct VirtIONet |
30 |
{ |
31 |
VirtIODevice vdev; |
32 |
uint8_t mac[ETH_ALEN]; |
33 |
uint16_t status; |
34 |
VirtQueue *rx_vq; |
35 |
VirtQueue *tx_vq; |
36 |
VirtQueue *ctrl_vq; |
37 |
NICState *nic; |
38 |
QEMUTimer *tx_timer; |
39 |
int tx_timer_active;
|
40 |
uint32_t has_vnet_hdr; |
41 |
uint8_t has_ufo; |
42 |
struct {
|
43 |
VirtQueueElement elem; |
44 |
ssize_t len; |
45 |
} async_tx; |
46 |
int mergeable_rx_bufs;
|
47 |
uint8_t promisc; |
48 |
uint8_t allmulti; |
49 |
uint8_t alluni; |
50 |
uint8_t nomulti; |
51 |
uint8_t nouni; |
52 |
uint8_t nobcast; |
53 |
uint8_t vhost_started; |
54 |
VMChangeStateEntry *vmstate; |
55 |
struct {
|
56 |
int in_use;
|
57 |
int first_multi;
|
58 |
uint8_t multi_overflow; |
59 |
uint8_t uni_overflow; |
60 |
uint8_t *macs; |
61 |
} mac_table; |
62 |
uint32_t *vlans; |
63 |
DeviceState *qdev; |
64 |
} VirtIONet; |
65 |
|
66 |
/* TODO
|
67 |
* - we could suppress RX interrupt if we were so inclined.
|
68 |
*/
|
69 |
|
70 |
static VirtIONet *to_virtio_net(VirtIODevice *vdev)
|
71 |
{ |
72 |
return (VirtIONet *)vdev;
|
73 |
} |
74 |
|
75 |
static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config) |
76 |
{ |
77 |
VirtIONet *n = to_virtio_net(vdev); |
78 |
struct virtio_net_config netcfg;
|
79 |
|
80 |
netcfg.status = n->status; |
81 |
memcpy(netcfg.mac, n->mac, ETH_ALEN); |
82 |
memcpy(config, &netcfg, sizeof(netcfg));
|
83 |
} |
84 |
|
85 |
static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config) |
86 |
{ |
87 |
VirtIONet *n = to_virtio_net(vdev); |
88 |
struct virtio_net_config netcfg;
|
89 |
|
90 |
memcpy(&netcfg, config, sizeof(netcfg));
|
91 |
|
92 |
if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
|
93 |
memcpy(n->mac, netcfg.mac, ETH_ALEN); |
94 |
qemu_format_nic_info_str(&n->nic->nc, n->mac); |
95 |
} |
96 |
} |
97 |
|
98 |
static void virtio_net_set_link_status(VLANClientState *nc) |
99 |
{ |
100 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
101 |
uint16_t old_status = n->status; |
102 |
|
103 |
if (nc->link_down)
|
104 |
n->status &= ~VIRTIO_NET_S_LINK_UP; |
105 |
else
|
106 |
n->status |= VIRTIO_NET_S_LINK_UP; |
107 |
|
108 |
if (n->status != old_status)
|
109 |
virtio_notify_config(&n->vdev); |
110 |
} |
111 |
|
112 |
static void virtio_net_reset(VirtIODevice *vdev) |
113 |
{ |
114 |
VirtIONet *n = to_virtio_net(vdev); |
115 |
|
116 |
/* Reset back to compatibility mode */
|
117 |
n->promisc = 1;
|
118 |
n->allmulti = 0;
|
119 |
n->alluni = 0;
|
120 |
n->nomulti = 0;
|
121 |
n->nouni = 0;
|
122 |
n->nobcast = 0;
|
123 |
if (n->vhost_started) {
|
124 |
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev); |
125 |
n->vhost_started = 0;
|
126 |
} |
127 |
|
128 |
/* Flush any MAC and VLAN filter table state */
|
129 |
n->mac_table.in_use = 0;
|
130 |
n->mac_table.first_multi = 0;
|
131 |
n->mac_table.multi_overflow = 0;
|
132 |
n->mac_table.uni_overflow = 0;
|
133 |
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
|
134 |
memset(n->vlans, 0, MAX_VLAN >> 3); |
135 |
} |
136 |
|
137 |
static int peer_has_vnet_hdr(VirtIONet *n) |
138 |
{ |
139 |
if (!n->nic->nc.peer)
|
140 |
return 0; |
141 |
|
142 |
if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP)
|
143 |
return 0; |
144 |
|
145 |
n->has_vnet_hdr = tap_has_vnet_hdr(n->nic->nc.peer); |
146 |
|
147 |
return n->has_vnet_hdr;
|
148 |
} |
149 |
|
150 |
static int peer_has_ufo(VirtIONet *n) |
151 |
{ |
152 |
if (!peer_has_vnet_hdr(n))
|
153 |
return 0; |
154 |
|
155 |
n->has_ufo = tap_has_ufo(n->nic->nc.peer); |
156 |
|
157 |
return n->has_ufo;
|
158 |
} |
159 |
|
160 |
static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
|
161 |
{ |
162 |
VirtIONet *n = to_virtio_net(vdev); |
163 |
|
164 |
features |= (1 << VIRTIO_NET_F_MAC);
|
165 |
|
166 |
if (peer_has_vnet_hdr(n)) {
|
167 |
tap_using_vnet_hdr(n->nic->nc.peer, 1);
|
168 |
} else {
|
169 |
features &= ~(0x1 << VIRTIO_NET_F_CSUM);
|
170 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4);
|
171 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6);
|
172 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN);
|
173 |
|
174 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM);
|
175 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4);
|
176 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6);
|
177 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN);
|
178 |
} |
179 |
|
180 |
if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
|
181 |
features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO);
|
182 |
features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO);
|
183 |
} |
184 |
|
185 |
if (!n->nic->nc.peer ||
|
186 |
n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) { |
187 |
return features;
|
188 |
} |
189 |
if (!tap_get_vhost_net(n->nic->nc.peer)) {
|
190 |
return features;
|
191 |
} |
192 |
return vhost_net_get_features(tap_get_vhost_net(n->nic->nc.peer), features);
|
193 |
} |
194 |
|
195 |
static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
|
196 |
{ |
197 |
uint32_t features = 0;
|
198 |
|
199 |
/* Linux kernel 2.6.25. It understood MAC (as everyone must),
|
200 |
* but also these: */
|
201 |
features |= (1 << VIRTIO_NET_F_MAC);
|
202 |
features |= (1 << VIRTIO_NET_F_CSUM);
|
203 |
features |= (1 << VIRTIO_NET_F_HOST_TSO4);
|
204 |
features |= (1 << VIRTIO_NET_F_HOST_TSO6);
|
205 |
features |= (1 << VIRTIO_NET_F_HOST_ECN);
|
206 |
|
207 |
return features;
|
208 |
} |
209 |
|
210 |
static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features) |
211 |
{ |
212 |
VirtIONet *n = to_virtio_net(vdev); |
213 |
|
214 |
n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
|
215 |
|
216 |
if (n->has_vnet_hdr) {
|
217 |
tap_set_offload(n->nic->nc.peer, |
218 |
(features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
219 |
(features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
220 |
(features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
221 |
(features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
222 |
(features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
223 |
} |
224 |
if (!n->nic->nc.peer ||
|
225 |
n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) { |
226 |
return;
|
227 |
} |
228 |
if (!tap_get_vhost_net(n->nic->nc.peer)) {
|
229 |
return;
|
230 |
} |
231 |
vhost_net_ack_features(tap_get_vhost_net(n->nic->nc.peer), features); |
232 |
} |
233 |
|
234 |
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd, |
235 |
VirtQueueElement *elem) |
236 |
{ |
237 |
uint8_t on; |
238 |
|
239 |
if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) { |
240 |
fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
|
241 |
exit(1);
|
242 |
} |
243 |
|
244 |
on = ldub_p(elem->out_sg[1].iov_base);
|
245 |
|
246 |
if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
|
247 |
n->promisc = on; |
248 |
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI) |
249 |
n->allmulti = on; |
250 |
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLUNI) |
251 |
n->alluni = on; |
252 |
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOMULTI) |
253 |
n->nomulti = on; |
254 |
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOUNI) |
255 |
n->nouni = on; |
256 |
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOBCAST) |
257 |
n->nobcast = on; |
258 |
else
|
259 |
return VIRTIO_NET_ERR;
|
260 |
|
261 |
return VIRTIO_NET_OK;
|
262 |
} |
263 |
|
264 |
static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd, |
265 |
VirtQueueElement *elem) |
266 |
{ |
267 |
struct virtio_net_ctrl_mac mac_data;
|
268 |
|
269 |
if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 || |
270 |
elem->out_sg[1].iov_len < sizeof(mac_data) || |
271 |
elem->out_sg[2].iov_len < sizeof(mac_data)) |
272 |
return VIRTIO_NET_ERR;
|
273 |
|
274 |
n->mac_table.in_use = 0;
|
275 |
n->mac_table.first_multi = 0;
|
276 |
n->mac_table.uni_overflow = 0;
|
277 |
n->mac_table.multi_overflow = 0;
|
278 |
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
|
279 |
|
280 |
mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
|
281 |
|
282 |
if (sizeof(mac_data.entries) + |
283 |
(mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
|
284 |
return VIRTIO_NET_ERR;
|
285 |
|
286 |
if (mac_data.entries <= MAC_TABLE_ENTRIES) {
|
287 |
memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data), |
288 |
mac_data.entries * ETH_ALEN); |
289 |
n->mac_table.in_use += mac_data.entries; |
290 |
} else {
|
291 |
n->mac_table.uni_overflow = 1;
|
292 |
} |
293 |
|
294 |
n->mac_table.first_multi = n->mac_table.in_use; |
295 |
|
296 |
mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
|
297 |
|
298 |
if (sizeof(mac_data.entries) + |
299 |
(mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
|
300 |
return VIRTIO_NET_ERR;
|
301 |
|
302 |
if (mac_data.entries) {
|
303 |
if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
|
304 |
memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN), |
305 |
elem->out_sg[2].iov_base + sizeof(mac_data), |
306 |
mac_data.entries * ETH_ALEN); |
307 |
n->mac_table.in_use += mac_data.entries; |
308 |
} else {
|
309 |
n->mac_table.multi_overflow = 1;
|
310 |
} |
311 |
} |
312 |
|
313 |
return VIRTIO_NET_OK;
|
314 |
} |
315 |
|
316 |
static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd, |
317 |
VirtQueueElement *elem) |
318 |
{ |
319 |
uint16_t vid; |
320 |
|
321 |
if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) { |
322 |
fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
|
323 |
return VIRTIO_NET_ERR;
|
324 |
} |
325 |
|
326 |
vid = lduw_le_p(elem->out_sg[1].iov_base);
|
327 |
|
328 |
if (vid >= MAX_VLAN)
|
329 |
return VIRTIO_NET_ERR;
|
330 |
|
331 |
if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
|
332 |
n->vlans[vid >> 5] |= (1U << (vid & 0x1f)); |
333 |
else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL) |
334 |
n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f)); |
335 |
else
|
336 |
return VIRTIO_NET_ERR;
|
337 |
|
338 |
return VIRTIO_NET_OK;
|
339 |
} |
340 |
|
341 |
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq) |
342 |
{ |
343 |
VirtIONet *n = to_virtio_net(vdev); |
344 |
struct virtio_net_ctrl_hdr ctrl;
|
345 |
virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
346 |
VirtQueueElement elem; |
347 |
|
348 |
while (virtqueue_pop(vq, &elem)) {
|
349 |
if ((elem.in_num < 1) || (elem.out_num < 1)) { |
350 |
fprintf(stderr, "virtio-net ctrl missing headers\n");
|
351 |
exit(1);
|
352 |
} |
353 |
|
354 |
if (elem.out_sg[0].iov_len < sizeof(ctrl) || |
355 |
elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) { |
356 |
fprintf(stderr, "virtio-net ctrl header not in correct element\n");
|
357 |
exit(1);
|
358 |
} |
359 |
|
360 |
ctrl.class = ldub_p(elem.out_sg[0].iov_base);
|
361 |
ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class)); |
362 |
|
363 |
if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
|
364 |
status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem); |
365 |
else if (ctrl.class == VIRTIO_NET_CTRL_MAC) |
366 |
status = virtio_net_handle_mac(n, ctrl.cmd, &elem); |
367 |
else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) |
368 |
status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem); |
369 |
|
370 |
stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
|
371 |
|
372 |
virtqueue_push(vq, &elem, sizeof(status));
|
373 |
virtio_notify(vdev, vq); |
374 |
} |
375 |
} |
376 |
|
377 |
/* RX */
|
378 |
|
379 |
static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq) |
380 |
{ |
381 |
VirtIONet *n = to_virtio_net(vdev); |
382 |
|
383 |
qemu_flush_queued_packets(&n->nic->nc); |
384 |
|
385 |
/* We now have RX buffers, signal to the IO thread to break out of the
|
386 |
* select to re-poll the tap file descriptor */
|
387 |
qemu_notify_event(); |
388 |
} |
389 |
|
390 |
static int virtio_net_can_receive(VLANClientState *nc) |
391 |
{ |
392 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
393 |
|
394 |
if (!virtio_queue_ready(n->rx_vq) ||
|
395 |
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) |
396 |
return 0; |
397 |
|
398 |
return 1; |
399 |
} |
400 |
|
401 |
static int virtio_net_has_buffers(VirtIONet *n, int bufsize) |
402 |
{ |
403 |
if (virtio_queue_empty(n->rx_vq) ||
|
404 |
(n->mergeable_rx_bufs && |
405 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
|
406 |
virtio_queue_set_notification(n->rx_vq, 1);
|
407 |
|
408 |
/* To avoid a race condition where the guest has made some buffers
|
409 |
* available after the above check but before notification was
|
410 |
* enabled, check for available buffers again.
|
411 |
*/
|
412 |
if (virtio_queue_empty(n->rx_vq) ||
|
413 |
(n->mergeable_rx_bufs && |
414 |
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0)))
|
415 |
return 0; |
416 |
} |
417 |
|
418 |
virtio_queue_set_notification(n->rx_vq, 0);
|
419 |
return 1; |
420 |
} |
421 |
|
422 |
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
|
423 |
* it never finds out that the packets don't have valid checksums. This
|
424 |
* causes dhclient to get upset. Fedora's carried a patch for ages to
|
425 |
* fix this with Xen but it hasn't appeared in an upstream release of
|
426 |
* dhclient yet.
|
427 |
*
|
428 |
* To avoid breaking existing guests, we catch udp packets and add
|
429 |
* checksums. This is terrible but it's better than hacking the guest
|
430 |
* kernels.
|
431 |
*
|
432 |
* N.B. if we introduce a zero-copy API, this operation is no longer free so
|
433 |
* we should provide a mechanism to disable it to avoid polluting the host
|
434 |
* cache.
|
435 |
*/
|
436 |
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr, |
437 |
const uint8_t *buf, size_t size)
|
438 |
{ |
439 |
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */ |
440 |
(size > 27 && size < 1500) && /* normal sized MTU */ |
441 |
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */ |
442 |
(buf[23] == 17) && /* ip.protocol == UDP */ |
443 |
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */ |
444 |
/* FIXME this cast is evil */
|
445 |
net_checksum_calculate((uint8_t *)buf, size); |
446 |
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM; |
447 |
} |
448 |
} |
449 |
|
450 |
static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt, |
451 |
const void *buf, size_t size, size_t hdr_len) |
452 |
{ |
453 |
struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base; |
454 |
int offset = 0; |
455 |
|
456 |
hdr->flags = 0;
|
457 |
hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; |
458 |
|
459 |
if (n->has_vnet_hdr) {
|
460 |
memcpy(hdr, buf, sizeof(*hdr));
|
461 |
offset = sizeof(*hdr);
|
462 |
work_around_broken_dhclient(hdr, buf + offset, size - offset); |
463 |
} |
464 |
|
465 |
/* We only ever receive a struct virtio_net_hdr from the tapfd,
|
466 |
* but we may be passing along a larger header to the guest.
|
467 |
*/
|
468 |
iov[0].iov_base += hdr_len;
|
469 |
iov[0].iov_len -= hdr_len;
|
470 |
|
471 |
return offset;
|
472 |
} |
473 |
|
474 |
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size) |
475 |
{ |
476 |
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; |
477 |
static const uint8_t vlan[] = {0x81, 0x00}; |
478 |
uint8_t *ptr = (uint8_t *)buf; |
479 |
int i;
|
480 |
|
481 |
if (n->promisc)
|
482 |
return 1; |
483 |
|
484 |
if (n->has_vnet_hdr) {
|
485 |
ptr += sizeof(struct virtio_net_hdr); |
486 |
} |
487 |
|
488 |
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) { |
489 |
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff; |
490 |
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f)))) |
491 |
return 0; |
492 |
} |
493 |
|
494 |
if (ptr[0] & 1) { // multicast |
495 |
if (!memcmp(ptr, bcast, sizeof(bcast))) { |
496 |
return !n->nobcast;
|
497 |
} else if (n->nomulti) { |
498 |
return 0; |
499 |
} else if (n->allmulti || n->mac_table.multi_overflow) { |
500 |
return 1; |
501 |
} |
502 |
|
503 |
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
|
504 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
505 |
return 1; |
506 |
} |
507 |
} |
508 |
} else { // unicast |
509 |
if (n->nouni) {
|
510 |
return 0; |
511 |
} else if (n->alluni || n->mac_table.uni_overflow) { |
512 |
return 1; |
513 |
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) { |
514 |
return 1; |
515 |
} |
516 |
|
517 |
for (i = 0; i < n->mac_table.first_multi; i++) { |
518 |
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
|
519 |
return 1; |
520 |
} |
521 |
} |
522 |
} |
523 |
|
524 |
return 0; |
525 |
} |
526 |
|
527 |
static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_t size) |
528 |
{ |
529 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
530 |
struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL; |
531 |
size_t guest_hdr_len, offset, i, host_hdr_len; |
532 |
|
533 |
if (!virtio_net_can_receive(&n->nic->nc))
|
534 |
return -1; |
535 |
|
536 |
/* hdr_len refers to the header we supply to the guest */
|
537 |
guest_hdr_len = n->mergeable_rx_bufs ? |
538 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr); |
539 |
|
540 |
|
541 |
host_hdr_len = n->has_vnet_hdr ? sizeof(struct virtio_net_hdr) : 0; |
542 |
if (!virtio_net_has_buffers(n, size + guest_hdr_len - host_hdr_len))
|
543 |
return 0; |
544 |
|
545 |
if (!receive_filter(n, buf, size))
|
546 |
return size;
|
547 |
|
548 |
offset = i = 0;
|
549 |
|
550 |
while (offset < size) {
|
551 |
VirtQueueElement elem; |
552 |
int len, total;
|
553 |
struct iovec sg[VIRTQUEUE_MAX_SIZE];
|
554 |
|
555 |
total = 0;
|
556 |
|
557 |
if (virtqueue_pop(n->rx_vq, &elem) == 0) { |
558 |
if (i == 0) |
559 |
return -1; |
560 |
fprintf(stderr, "virtio-net unexpected empty queue: "
|
561 |
"i %zd mergeable %d offset %zd, size %zd, "
|
562 |
"guest hdr len %zd, host hdr len %zd guest features 0x%x\n",
|
563 |
i, n->mergeable_rx_bufs, offset, size, |
564 |
guest_hdr_len, host_hdr_len, n->vdev.guest_features); |
565 |
exit(1);
|
566 |
} |
567 |
|
568 |
if (elem.in_num < 1) { |
569 |
fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
|
570 |
exit(1);
|
571 |
} |
572 |
|
573 |
if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != guest_hdr_len) { |
574 |
fprintf(stderr, "virtio-net header not in first element\n");
|
575 |
exit(1);
|
576 |
} |
577 |
|
578 |
memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num); |
579 |
|
580 |
if (i == 0) { |
581 |
if (n->mergeable_rx_bufs)
|
582 |
mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base; |
583 |
|
584 |
offset += receive_header(n, sg, elem.in_num, |
585 |
buf + offset, size - offset, guest_hdr_len); |
586 |
total += guest_hdr_len; |
587 |
} |
588 |
|
589 |
/* copy in packet. ugh */
|
590 |
len = iov_from_buf(sg, elem.in_num, |
591 |
buf + offset, size - offset); |
592 |
total += len; |
593 |
offset += len; |
594 |
/* If buffers can't be merged, at this point we
|
595 |
* must have consumed the complete packet.
|
596 |
* Otherwise, drop it. */
|
597 |
if (!n->mergeable_rx_bufs && offset < size) {
|
598 |
#if 0
|
599 |
fprintf(stderr, "virtio-net truncated non-mergeable packet: "
|
600 |
|
601 |
"i %zd mergeable %d offset %zd, size %zd, "
|
602 |
"guest hdr len %zd, host hdr len %zd\n",
|
603 |
i, n->mergeable_rx_bufs,
|
604 |
offset, size, guest_hdr_len, host_hdr_len);
|
605 |
#endif
|
606 |
return size;
|
607 |
} |
608 |
|
609 |
/* signal other side */
|
610 |
virtqueue_fill(n->rx_vq, &elem, total, i++); |
611 |
} |
612 |
|
613 |
if (mhdr)
|
614 |
mhdr->num_buffers = i; |
615 |
|
616 |
virtqueue_flush(n->rx_vq, i); |
617 |
virtio_notify(&n->vdev, n->rx_vq); |
618 |
|
619 |
return size;
|
620 |
} |
621 |
|
622 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq); |
623 |
|
624 |
static void virtio_net_tx_complete(VLANClientState *nc, ssize_t len) |
625 |
{ |
626 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
627 |
|
628 |
virtqueue_push(n->tx_vq, &n->async_tx.elem, n->async_tx.len); |
629 |
virtio_notify(&n->vdev, n->tx_vq); |
630 |
|
631 |
n->async_tx.elem.out_num = n->async_tx.len = 0;
|
632 |
|
633 |
virtio_queue_set_notification(n->tx_vq, 1);
|
634 |
virtio_net_flush_tx(n, n->tx_vq); |
635 |
} |
636 |
|
637 |
/* TX */
|
638 |
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq) |
639 |
{ |
640 |
VirtQueueElement elem; |
641 |
|
642 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
643 |
return;
|
644 |
|
645 |
if (n->async_tx.elem.out_num) {
|
646 |
virtio_queue_set_notification(n->tx_vq, 0);
|
647 |
return;
|
648 |
} |
649 |
|
650 |
while (virtqueue_pop(vq, &elem)) {
|
651 |
ssize_t ret, len = 0;
|
652 |
unsigned int out_num = elem.out_num; |
653 |
struct iovec *out_sg = &elem.out_sg[0]; |
654 |
unsigned hdr_len;
|
655 |
|
656 |
/* hdr_len refers to the header received from the guest */
|
657 |
hdr_len = n->mergeable_rx_bufs ? |
658 |
sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
659 |
sizeof(struct virtio_net_hdr); |
660 |
|
661 |
if (out_num < 1 || out_sg->iov_len != hdr_len) { |
662 |
fprintf(stderr, "virtio-net header not in first element\n");
|
663 |
exit(1);
|
664 |
} |
665 |
|
666 |
/* ignore the header if GSO is not supported */
|
667 |
if (!n->has_vnet_hdr) {
|
668 |
out_num--; |
669 |
out_sg++; |
670 |
len += hdr_len; |
671 |
} else if (n->mergeable_rx_bufs) { |
672 |
/* tapfd expects a struct virtio_net_hdr */
|
673 |
hdr_len -= sizeof(struct virtio_net_hdr); |
674 |
out_sg->iov_len -= hdr_len; |
675 |
len += hdr_len; |
676 |
} |
677 |
|
678 |
ret = qemu_sendv_packet_async(&n->nic->nc, out_sg, out_num, |
679 |
virtio_net_tx_complete); |
680 |
if (ret == 0) { |
681 |
virtio_queue_set_notification(n->tx_vq, 0);
|
682 |
n->async_tx.elem = elem; |
683 |
n->async_tx.len = len; |
684 |
return;
|
685 |
} |
686 |
|
687 |
len += ret; |
688 |
|
689 |
virtqueue_push(vq, &elem, len); |
690 |
virtio_notify(&n->vdev, vq); |
691 |
} |
692 |
} |
693 |
|
694 |
static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq) |
695 |
{ |
696 |
VirtIONet *n = to_virtio_net(vdev); |
697 |
|
698 |
if (n->tx_timer_active) {
|
699 |
virtio_queue_set_notification(vq, 1);
|
700 |
qemu_del_timer(n->tx_timer); |
701 |
n->tx_timer_active = 0;
|
702 |
virtio_net_flush_tx(n, vq); |
703 |
} else {
|
704 |
qemu_mod_timer(n->tx_timer, |
705 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
706 |
n->tx_timer_active = 1;
|
707 |
virtio_queue_set_notification(vq, 0);
|
708 |
} |
709 |
} |
710 |
|
711 |
static void virtio_net_tx_timer(void *opaque) |
712 |
{ |
713 |
VirtIONet *n = opaque; |
714 |
|
715 |
n->tx_timer_active = 0;
|
716 |
|
717 |
/* Just in case the driver is not ready on more */
|
718 |
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
|
719 |
return;
|
720 |
|
721 |
virtio_queue_set_notification(n->tx_vq, 1);
|
722 |
virtio_net_flush_tx(n, n->tx_vq); |
723 |
} |
724 |
|
725 |
static void virtio_net_save(QEMUFile *f, void *opaque) |
726 |
{ |
727 |
VirtIONet *n = opaque; |
728 |
|
729 |
if (n->vhost_started) {
|
730 |
/* TODO: should we really stop the backend?
|
731 |
* If we don't, it might keep writing to memory. */
|
732 |
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev); |
733 |
n->vhost_started = 0;
|
734 |
} |
735 |
virtio_save(&n->vdev, f); |
736 |
|
737 |
qemu_put_buffer(f, n->mac, ETH_ALEN); |
738 |
qemu_put_be32(f, n->tx_timer_active); |
739 |
qemu_put_be32(f, n->mergeable_rx_bufs); |
740 |
qemu_put_be16(f, n->status); |
741 |
qemu_put_byte(f, n->promisc); |
742 |
qemu_put_byte(f, n->allmulti); |
743 |
qemu_put_be32(f, n->mac_table.in_use); |
744 |
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN); |
745 |
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
746 |
qemu_put_be32(f, n->has_vnet_hdr); |
747 |
qemu_put_byte(f, n->mac_table.multi_overflow); |
748 |
qemu_put_byte(f, n->mac_table.uni_overflow); |
749 |
qemu_put_byte(f, n->alluni); |
750 |
qemu_put_byte(f, n->nomulti); |
751 |
qemu_put_byte(f, n->nouni); |
752 |
qemu_put_byte(f, n->nobcast); |
753 |
qemu_put_byte(f, n->has_ufo); |
754 |
} |
755 |
|
756 |
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id) |
757 |
{ |
758 |
VirtIONet *n = opaque; |
759 |
int i;
|
760 |
|
761 |
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION) |
762 |
return -EINVAL;
|
763 |
|
764 |
virtio_load(&n->vdev, f); |
765 |
|
766 |
qemu_get_buffer(f, n->mac, ETH_ALEN); |
767 |
n->tx_timer_active = qemu_get_be32(f); |
768 |
n->mergeable_rx_bufs = qemu_get_be32(f); |
769 |
|
770 |
if (version_id >= 3) |
771 |
n->status = qemu_get_be16(f); |
772 |
|
773 |
if (version_id >= 4) { |
774 |
if (version_id < 8) { |
775 |
n->promisc = qemu_get_be32(f); |
776 |
n->allmulti = qemu_get_be32(f); |
777 |
} else {
|
778 |
n->promisc = qemu_get_byte(f); |
779 |
n->allmulti = qemu_get_byte(f); |
780 |
} |
781 |
} |
782 |
|
783 |
if (version_id >= 5) { |
784 |
n->mac_table.in_use = qemu_get_be32(f); |
785 |
/* MAC_TABLE_ENTRIES may be different from the saved image */
|
786 |
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
|
787 |
qemu_get_buffer(f, n->mac_table.macs, |
788 |
n->mac_table.in_use * ETH_ALEN); |
789 |
} else if (n->mac_table.in_use) { |
790 |
qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR); |
791 |
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
|
792 |
n->mac_table.in_use = 0;
|
793 |
} |
794 |
} |
795 |
|
796 |
if (version_id >= 6) |
797 |
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
|
798 |
|
799 |
if (version_id >= 7) { |
800 |
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
|
801 |
error_report("virtio-net: saved image requires vnet_hdr=on");
|
802 |
return -1; |
803 |
} |
804 |
|
805 |
if (n->has_vnet_hdr) {
|
806 |
tap_using_vnet_hdr(n->nic->nc.peer, 1);
|
807 |
tap_set_offload(n->nic->nc.peer, |
808 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
|
809 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
|
810 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
|
811 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
|
812 |
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
|
813 |
} |
814 |
} |
815 |
|
816 |
if (version_id >= 9) { |
817 |
n->mac_table.multi_overflow = qemu_get_byte(f); |
818 |
n->mac_table.uni_overflow = qemu_get_byte(f); |
819 |
} |
820 |
|
821 |
if (version_id >= 10) { |
822 |
n->alluni = qemu_get_byte(f); |
823 |
n->nomulti = qemu_get_byte(f); |
824 |
n->nouni = qemu_get_byte(f); |
825 |
n->nobcast = qemu_get_byte(f); |
826 |
} |
827 |
|
828 |
if (version_id >= 11) { |
829 |
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
|
830 |
error_report("virtio-net: saved image requires TUN_F_UFO support");
|
831 |
return -1; |
832 |
} |
833 |
} |
834 |
|
835 |
/* Find the first multicast entry in the saved MAC filter */
|
836 |
for (i = 0; i < n->mac_table.in_use; i++) { |
837 |
if (n->mac_table.macs[i * ETH_ALEN] & 1) { |
838 |
break;
|
839 |
} |
840 |
} |
841 |
n->mac_table.first_multi = i; |
842 |
|
843 |
if (n->tx_timer_active) {
|
844 |
qemu_mod_timer(n->tx_timer, |
845 |
qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL); |
846 |
} |
847 |
return 0; |
848 |
} |
849 |
|
850 |
static void virtio_net_cleanup(VLANClientState *nc) |
851 |
{ |
852 |
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque; |
853 |
|
854 |
n->nic = NULL;
|
855 |
} |
856 |
|
857 |
static NetClientInfo net_virtio_info = {
|
858 |
.type = NET_CLIENT_TYPE_NIC, |
859 |
.size = sizeof(NICState),
|
860 |
.can_receive = virtio_net_can_receive, |
861 |
.receive = virtio_net_receive, |
862 |
.cleanup = virtio_net_cleanup, |
863 |
.link_status_changed = virtio_net_set_link_status, |
864 |
}; |
865 |
|
866 |
static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) |
867 |
{ |
868 |
VirtIONet *n = to_virtio_net(vdev); |
869 |
if (!n->nic->nc.peer) {
|
870 |
return;
|
871 |
} |
872 |
if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
|
873 |
return;
|
874 |
} |
875 |
|
876 |
if (!tap_get_vhost_net(n->nic->nc.peer)) {
|
877 |
return;
|
878 |
} |
879 |
if (!!n->vhost_started == !!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
|
880 |
return;
|
881 |
} |
882 |
if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
|
883 |
int r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), vdev);
|
884 |
if (r < 0) { |
885 |
fprintf(stderr, "unable to start vhost net: %d: "
|
886 |
"falling back on userspace virtio\n", -r);
|
887 |
} else {
|
888 |
n->vhost_started = 1;
|
889 |
} |
890 |
} else {
|
891 |
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev); |
892 |
n->vhost_started = 0;
|
893 |
} |
894 |
} |
895 |
|
896 |
static void virtio_net_vmstate_change(void *opaque, int running, int reason) |
897 |
{ |
898 |
VirtIONet *n = opaque; |
899 |
uint8_t status = running ? VIRTIO_CONFIG_S_DRIVER_OK : 0;
|
900 |
/* This is called when vm is started/stopped,
|
901 |
* it will start/stop vhost backend if * appropriate
|
902 |
* e.g. after migration. */
|
903 |
virtio_net_set_status(&n->vdev, n->vdev.status & status); |
904 |
} |
905 |
|
906 |
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf) |
907 |
{ |
908 |
VirtIONet *n; |
909 |
|
910 |
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
|
911 |
sizeof(struct virtio_net_config), |
912 |
sizeof(VirtIONet));
|
913 |
|
914 |
n->vdev.get_config = virtio_net_get_config; |
915 |
n->vdev.set_config = virtio_net_set_config; |
916 |
n->vdev.get_features = virtio_net_get_features; |
917 |
n->vdev.set_features = virtio_net_set_features; |
918 |
n->vdev.bad_features = virtio_net_bad_features; |
919 |
n->vdev.reset = virtio_net_reset; |
920 |
n->vdev.set_status = virtio_net_set_status; |
921 |
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
|
922 |
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
|
923 |
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
|
924 |
qemu_macaddr_default_if_unset(&conf->macaddr); |
925 |
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac)); |
926 |
n->status = VIRTIO_NET_S_LINK_UP; |
927 |
|
928 |
n->nic = qemu_new_nic(&net_virtio_info, conf, dev->info->name, dev->id, n); |
929 |
|
930 |
qemu_format_nic_info_str(&n->nic->nc, conf->macaddr.a); |
931 |
|
932 |
n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n); |
933 |
n->tx_timer_active = 0;
|
934 |
n->mergeable_rx_bufs = 0;
|
935 |
n->promisc = 1; /* for compatibility */ |
936 |
|
937 |
n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN); |
938 |
|
939 |
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
|
940 |
|
941 |
n->qdev = dev; |
942 |
register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION, |
943 |
virtio_net_save, virtio_net_load, n); |
944 |
n->vmstate = qemu_add_vm_change_state_handler(virtio_net_vmstate_change, n); |
945 |
|
946 |
return &n->vdev;
|
947 |
} |
948 |
|
949 |
void virtio_net_exit(VirtIODevice *vdev)
|
950 |
{ |
951 |
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev); |
952 |
qemu_del_vm_change_state_handler(n->vmstate); |
953 |
|
954 |
if (n->vhost_started) {
|
955 |
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), vdev); |
956 |
} |
957 |
|
958 |
qemu_purge_queued_packets(&n->nic->nc); |
959 |
|
960 |
unregister_savevm(n->qdev, "virtio-net", n);
|
961 |
|
962 |
qemu_free(n->mac_table.macs); |
963 |
qemu_free(n->vlans); |
964 |
|
965 |
qemu_del_timer(n->tx_timer); |
966 |
qemu_free_timer(n->tx_timer); |
967 |
|
968 |
virtio_cleanup(&n->vdev); |
969 |
qemu_del_vlan_client(&n->nic->nc); |
970 |
} |