Commit | Line | Data |
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296f96fc RR |
1 | /* A simple network driver using virtio. |
2 | * | |
3 | * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | //#define DEBUG | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 22 | #include <linux/ethtool.h> |
296f96fc RR |
23 | #include <linux/module.h> |
24 | #include <linux/virtio.h> | |
25 | #include <linux/virtio_net.h> | |
26 | #include <linux/scatterlist.h> | |
e918085a | 27 | #include <linux/if_vlan.h> |
296f96fc | 28 | |
6c0cd7c0 DL |
29 | static int napi_weight = 128; |
30 | module_param(napi_weight, int, 0444); | |
31 | ||
34a48579 RR |
32 | static int csum = 1, gso = 1; |
33 | module_param(csum, bool, 0444); | |
34 | module_param(gso, bool, 0444); | |
35 | ||
296f96fc | 36 | /* FIXME: MTU in config. */ |
e918085a | 37 | #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 38 | #define GOOD_COPY_LEN 128 |
296f96fc | 39 | |
f565a7c2 | 40 | #define VIRTNET_SEND_COMMAND_SG_MAX 2 |
2a41f71d | 41 | |
296f96fc RR |
42 | struct virtnet_info |
43 | { | |
44 | struct virtio_device *vdev; | |
2a41f71d | 45 | struct virtqueue *rvq, *svq, *cvq; |
296f96fc RR |
46 | struct net_device *dev; |
47 | struct napi_struct napi; | |
9f4d26d0 | 48 | unsigned int status; |
296f96fc | 49 | |
99ffc696 RR |
50 | /* The skb we couldn't send because buffers were full. */ |
51 | struct sk_buff *last_xmit_skb; | |
52 | ||
363f1514 | 53 | /* If we need to free in a timer, this is it. */ |
14c998f0 MM |
54 | struct timer_list xmit_free_timer; |
55 | ||
296f96fc RR |
56 | /* Number of input buffers, and max we've ever had. */ |
57 | unsigned int num, max; | |
58 | ||
11a3a154 RR |
59 | /* For cleaning up after transmission. */ |
60 | struct tasklet_struct tasklet; | |
363f1514 | 61 | bool free_in_tasklet; |
11a3a154 | 62 | |
97402b96 HX |
63 | /* I like... big packets and I cannot lie! */ |
64 | bool big_packets; | |
65 | ||
3f2c31d9 MM |
66 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
67 | bool mergeable_rx_bufs; | |
68 | ||
296f96fc RR |
69 | /* Receive & send queues. */ |
70 | struct sk_buff_head recv; | |
71 | struct sk_buff_head send; | |
fb6813f4 RR |
72 | |
73 | /* Chain pages by the private ptr. */ | |
74 | struct page *pages; | |
296f96fc RR |
75 | }; |
76 | ||
3f2c31d9 | 77 | static inline void *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc RR |
78 | { |
79 | return (struct virtio_net_hdr *)skb->cb; | |
80 | } | |
81 | ||
fb6813f4 RR |
82 | static void give_a_page(struct virtnet_info *vi, struct page *page) |
83 | { | |
84 | page->private = (unsigned long)vi->pages; | |
85 | vi->pages = page; | |
86 | } | |
87 | ||
0a888fd1 MM |
88 | static void trim_pages(struct virtnet_info *vi, struct sk_buff *skb) |
89 | { | |
90 | unsigned int i; | |
91 | ||
92 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) | |
93 | give_a_page(vi, skb_shinfo(skb)->frags[i].page); | |
94 | skb_shinfo(skb)->nr_frags = 0; | |
95 | skb->data_len = 0; | |
96 | } | |
97 | ||
fb6813f4 RR |
98 | static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) |
99 | { | |
100 | struct page *p = vi->pages; | |
101 | ||
102 | if (p) | |
103 | vi->pages = (struct page *)p->private; | |
104 | else | |
105 | p = alloc_page(gfp_mask); | |
106 | return p; | |
107 | } | |
108 | ||
2cb9c6ba | 109 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 110 | { |
2cb9c6ba | 111 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 112 | |
2cb9c6ba RR |
113 | /* Suppress further interrupts. */ |
114 | svq->vq_ops->disable_cb(svq); | |
11a3a154 | 115 | |
363f1514 | 116 | /* We were probably waiting for more output buffers. */ |
296f96fc | 117 | netif_wake_queue(vi->dev); |
11a3a154 RR |
118 | |
119 | /* Make sure we re-xmit last_xmit_skb: if there are no more packets | |
120 | * queued, start_xmit won't be called. */ | |
121 | tasklet_schedule(&vi->tasklet); | |
296f96fc RR |
122 | } |
123 | ||
124 | static void receive_skb(struct net_device *dev, struct sk_buff *skb, | |
125 | unsigned len) | |
126 | { | |
3f2c31d9 | 127 | struct virtnet_info *vi = netdev_priv(dev); |
296f96fc | 128 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); |
97402b96 | 129 | int err; |
3f2c31d9 | 130 | int i; |
296f96fc RR |
131 | |
132 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { | |
133 | pr_debug("%s: short packet %i\n", dev->name, len); | |
134 | dev->stats.rx_length_errors++; | |
135 | goto drop; | |
136 | } | |
23cde76d | 137 | |
3f2c31d9 MM |
138 | if (vi->mergeable_rx_bufs) { |
139 | struct virtio_net_hdr_mrg_rxbuf *mhdr = skb_vnet_hdr(skb); | |
140 | unsigned int copy; | |
141 | char *p = page_address(skb_shinfo(skb)->frags[0].page); | |
fb6813f4 | 142 | |
3f2c31d9 MM |
143 | if (len > PAGE_SIZE) |
144 | len = PAGE_SIZE; | |
145 | len -= sizeof(struct virtio_net_hdr_mrg_rxbuf); | |
146 | ||
147 | memcpy(hdr, p, sizeof(*mhdr)); | |
148 | p += sizeof(*mhdr); | |
149 | ||
150 | copy = len; | |
151 | if (copy > skb_tailroom(skb)) | |
152 | copy = skb_tailroom(skb); | |
153 | ||
154 | memcpy(skb_put(skb, copy), p, copy); | |
155 | ||
156 | len -= copy; | |
157 | ||
158 | if (!len) { | |
159 | give_a_page(vi, skb_shinfo(skb)->frags[0].page); | |
160 | skb_shinfo(skb)->nr_frags--; | |
161 | } else { | |
162 | skb_shinfo(skb)->frags[0].page_offset += | |
163 | sizeof(*mhdr) + copy; | |
164 | skb_shinfo(skb)->frags[0].size = len; | |
165 | skb->data_len += len; | |
166 | skb->len += len; | |
167 | } | |
168 | ||
169 | while (--mhdr->num_buffers) { | |
170 | struct sk_buff *nskb; | |
171 | ||
172 | i = skb_shinfo(skb)->nr_frags; | |
173 | if (i >= MAX_SKB_FRAGS) { | |
174 | pr_debug("%s: packet too long %d\n", dev->name, | |
175 | len); | |
176 | dev->stats.rx_length_errors++; | |
177 | goto drop; | |
178 | } | |
179 | ||
180 | nskb = vi->rvq->vq_ops->get_buf(vi->rvq, &len); | |
181 | if (!nskb) { | |
182 | pr_debug("%s: rx error: %d buffers missing\n", | |
183 | dev->name, mhdr->num_buffers); | |
184 | dev->stats.rx_length_errors++; | |
185 | goto drop; | |
186 | } | |
187 | ||
188 | __skb_unlink(nskb, &vi->recv); | |
189 | vi->num--; | |
190 | ||
191 | skb_shinfo(skb)->frags[i] = skb_shinfo(nskb)->frags[0]; | |
192 | skb_shinfo(nskb)->nr_frags = 0; | |
193 | kfree_skb(nskb); | |
194 | ||
195 | if (len > PAGE_SIZE) | |
196 | len = PAGE_SIZE; | |
197 | ||
198 | skb_shinfo(skb)->frags[i].size = len; | |
199 | skb_shinfo(skb)->nr_frags++; | |
200 | skb->data_len += len; | |
201 | skb->len += len; | |
202 | } | |
203 | } else { | |
204 | len -= sizeof(struct virtio_net_hdr); | |
205 | ||
206 | if (len <= MAX_PACKET_LEN) | |
207 | trim_pages(vi, skb); | |
208 | ||
209 | err = pskb_trim(skb, len); | |
210 | if (err) { | |
211 | pr_debug("%s: pskb_trim failed %i %d\n", dev->name, | |
212 | len, err); | |
213 | dev->stats.rx_dropped++; | |
214 | goto drop; | |
215 | } | |
97402b96 | 216 | } |
3f2c31d9 | 217 | |
97402b96 | 218 | skb->truesize += skb->data_len; |
296f96fc RR |
219 | dev->stats.rx_bytes += skb->len; |
220 | dev->stats.rx_packets++; | |
221 | ||
222 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
223 | pr_debug("Needs csum!\n"); | |
f35d9d8a | 224 | if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset)) |
296f96fc | 225 | goto frame_err; |
296f96fc RR |
226 | } |
227 | ||
23cde76d MM |
228 | skb->protocol = eth_type_trans(skb, dev); |
229 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
230 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
231 | ||
296f96fc RR |
232 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
233 | pr_debug("GSO!\n"); | |
34a48579 | 234 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
235 | case VIRTIO_NET_HDR_GSO_TCPV4: |
236 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
237 | break; | |
296f96fc RR |
238 | case VIRTIO_NET_HDR_GSO_UDP: |
239 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
240 | break; | |
241 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
242 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
243 | break; | |
244 | default: | |
245 | if (net_ratelimit()) | |
246 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
247 | dev->name, hdr->gso_type); | |
248 | goto frame_err; | |
249 | } | |
250 | ||
34a48579 RR |
251 | if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) |
252 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
253 | ||
296f96fc RR |
254 | skb_shinfo(skb)->gso_size = hdr->gso_size; |
255 | if (skb_shinfo(skb)->gso_size == 0) { | |
256 | if (net_ratelimit()) | |
257 | printk(KERN_WARNING "%s: zero gso size.\n", | |
258 | dev->name); | |
259 | goto frame_err; | |
260 | } | |
261 | ||
262 | /* Header must be checked, and gso_segs computed. */ | |
263 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
264 | skb_shinfo(skb)->gso_segs = 0; | |
265 | } | |
266 | ||
267 | netif_receive_skb(skb); | |
268 | return; | |
269 | ||
270 | frame_err: | |
271 | dev->stats.rx_frame_errors++; | |
272 | drop: | |
273 | dev_kfree_skb(skb); | |
274 | } | |
275 | ||
3f2c31d9 | 276 | static void try_fill_recv_maxbufs(struct virtnet_info *vi) |
296f96fc RR |
277 | { |
278 | struct sk_buff *skb; | |
05271685 | 279 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
97402b96 | 280 | int num, err, i; |
296f96fc | 281 | |
05271685 | 282 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
296f96fc | 283 | for (;;) { |
3f2c31d9 MM |
284 | struct virtio_net_hdr *hdr; |
285 | ||
296f96fc RR |
286 | skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN); |
287 | if (unlikely(!skb)) | |
288 | break; | |
289 | ||
290 | skb_put(skb, MAX_PACKET_LEN); | |
3f2c31d9 MM |
291 | |
292 | hdr = skb_vnet_hdr(skb); | |
8527bec5 | 293 | sg_set_buf(sg, hdr, sizeof(*hdr)); |
97402b96 HX |
294 | |
295 | if (vi->big_packets) { | |
296 | for (i = 0; i < MAX_SKB_FRAGS; i++) { | |
297 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; | |
fb6813f4 | 298 | f->page = get_a_page(vi, GFP_ATOMIC); |
97402b96 HX |
299 | if (!f->page) |
300 | break; | |
301 | ||
302 | f->page_offset = 0; | |
303 | f->size = PAGE_SIZE; | |
304 | ||
305 | skb->data_len += PAGE_SIZE; | |
306 | skb->len += PAGE_SIZE; | |
307 | ||
308 | skb_shinfo(skb)->nr_frags++; | |
309 | } | |
310 | } | |
311 | ||
296f96fc RR |
312 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
313 | skb_queue_head(&vi->recv, skb); | |
314 | ||
315 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); | |
316 | if (err) { | |
317 | skb_unlink(skb, &vi->recv); | |
0a888fd1 | 318 | trim_pages(vi, skb); |
296f96fc RR |
319 | kfree_skb(skb); |
320 | break; | |
321 | } | |
322 | vi->num++; | |
323 | } | |
324 | if (unlikely(vi->num > vi->max)) | |
325 | vi->max = vi->num; | |
326 | vi->rvq->vq_ops->kick(vi->rvq); | |
327 | } | |
328 | ||
3f2c31d9 MM |
329 | static void try_fill_recv(struct virtnet_info *vi) |
330 | { | |
331 | struct sk_buff *skb; | |
332 | struct scatterlist sg[1]; | |
333 | int err; | |
334 | ||
335 | if (!vi->mergeable_rx_bufs) { | |
336 | try_fill_recv_maxbufs(vi); | |
337 | return; | |
338 | } | |
339 | ||
340 | for (;;) { | |
341 | skb_frag_t *f; | |
342 | ||
343 | skb = netdev_alloc_skb(vi->dev, GOOD_COPY_LEN + NET_IP_ALIGN); | |
344 | if (unlikely(!skb)) | |
345 | break; | |
346 | ||
347 | skb_reserve(skb, NET_IP_ALIGN); | |
348 | ||
349 | f = &skb_shinfo(skb)->frags[0]; | |
350 | f->page = get_a_page(vi, GFP_ATOMIC); | |
351 | if (!f->page) { | |
352 | kfree_skb(skb); | |
353 | break; | |
354 | } | |
355 | ||
356 | f->page_offset = 0; | |
357 | f->size = PAGE_SIZE; | |
358 | ||
359 | skb_shinfo(skb)->nr_frags++; | |
360 | ||
361 | sg_init_one(sg, page_address(f->page), PAGE_SIZE); | |
362 | skb_queue_head(&vi->recv, skb); | |
363 | ||
364 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 1, skb); | |
365 | if (err) { | |
366 | skb_unlink(skb, &vi->recv); | |
367 | kfree_skb(skb); | |
368 | break; | |
369 | } | |
370 | vi->num++; | |
371 | } | |
372 | if (unlikely(vi->num > vi->max)) | |
373 | vi->max = vi->num; | |
374 | vi->rvq->vq_ops->kick(vi->rvq); | |
375 | } | |
376 | ||
18445c4d | 377 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
378 | { |
379 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d | 380 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
288379f0 | 381 | if (napi_schedule_prep(&vi->napi)) { |
18445c4d | 382 | rvq->vq_ops->disable_cb(rvq); |
288379f0 | 383 | __napi_schedule(&vi->napi); |
18445c4d | 384 | } |
296f96fc RR |
385 | } |
386 | ||
387 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
388 | { | |
389 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
390 | struct sk_buff *skb = NULL; | |
391 | unsigned int len, received = 0; | |
392 | ||
393 | again: | |
394 | while (received < budget && | |
395 | (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { | |
396 | __skb_unlink(skb, &vi->recv); | |
397 | receive_skb(vi->dev, skb, len); | |
398 | vi->num--; | |
399 | received++; | |
400 | } | |
401 | ||
402 | /* FIXME: If we oom and completely run out of inbufs, we need | |
403 | * to start a timer trying to fill more. */ | |
404 | if (vi->num < vi->max / 2) | |
405 | try_fill_recv(vi); | |
406 | ||
8329d98e RR |
407 | /* Out of packets? */ |
408 | if (received < budget) { | |
288379f0 | 409 | napi_complete(napi); |
18445c4d | 410 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) |
4265f161 CB |
411 | && napi_schedule_prep(napi)) { |
412 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
288379f0 | 413 | __napi_schedule(napi); |
296f96fc | 414 | goto again; |
4265f161 | 415 | } |
296f96fc RR |
416 | } |
417 | ||
418 | return received; | |
419 | } | |
420 | ||
421 | static void free_old_xmit_skbs(struct virtnet_info *vi) | |
422 | { | |
423 | struct sk_buff *skb; | |
424 | unsigned int len; | |
425 | ||
426 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { | |
427 | pr_debug("Sent skb %p\n", skb); | |
428 | __skb_unlink(skb, &vi->send); | |
655aa31f | 429 | vi->dev->stats.tx_bytes += skb->len; |
296f96fc RR |
430 | vi->dev->stats.tx_packets++; |
431 | kfree_skb(skb); | |
432 | } | |
433 | } | |
434 | ||
363f1514 RR |
435 | /* If the virtio transport doesn't always notify us when all in-flight packets |
436 | * are consumed, we fall back to using this function on a timer to free them. */ | |
14c998f0 MM |
437 | static void xmit_free(unsigned long data) |
438 | { | |
439 | struct virtnet_info *vi = (void *)data; | |
440 | ||
441 | netif_tx_lock(vi->dev); | |
442 | ||
443 | free_old_xmit_skbs(vi); | |
444 | ||
445 | if (!skb_queue_empty(&vi->send)) | |
446 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); | |
447 | ||
448 | netif_tx_unlock(vi->dev); | |
449 | } | |
450 | ||
99ffc696 | 451 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 452 | { |
14c998f0 | 453 | int num, err; |
05271685 | 454 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
3f2c31d9 MM |
455 | struct virtio_net_hdr_mrg_rxbuf *mhdr = skb_vnet_hdr(skb); |
456 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); | |
296f96fc | 457 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
296f96fc | 458 | |
05271685 | 459 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
4d125de3 | 460 | |
e174961c | 461 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 462 | |
296f96fc RR |
463 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
464 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
465 | hdr->csum_start = skb->csum_start - skb_headroom(skb); | |
466 | hdr->csum_offset = skb->csum_offset; | |
467 | } else { | |
468 | hdr->flags = 0; | |
469 | hdr->csum_offset = hdr->csum_start = 0; | |
470 | } | |
471 | ||
472 | if (skb_is_gso(skb)) { | |
50c8ea80 | 473 | hdr->hdr_len = skb_transport_header(skb) - skb->data; |
296f96fc | 474 | hdr->gso_size = skb_shinfo(skb)->gso_size; |
34a48579 | 475 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
296f96fc RR |
476 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
477 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) | |
478 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
479 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
480 | hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
481 | else | |
482 | BUG(); | |
34a48579 RR |
483 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
484 | hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
296f96fc RR |
485 | } else { |
486 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
50c8ea80 | 487 | hdr->gso_size = hdr->hdr_len = 0; |
296f96fc RR |
488 | } |
489 | ||
3f2c31d9 MM |
490 | mhdr->num_buffers = 0; |
491 | ||
492 | /* Encode metadata header at front. */ | |
493 | if (vi->mergeable_rx_bufs) | |
8527bec5 | 494 | sg_set_buf(sg, mhdr, sizeof(*mhdr)); |
3f2c31d9 | 495 | else |
8527bec5 | 496 | sg_set_buf(sg, hdr, sizeof(*hdr)); |
3f2c31d9 | 497 | |
296f96fc | 498 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
99ffc696 | 499 | |
14c998f0 | 500 | err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); |
363f1514 | 501 | if (!err && !vi->free_in_tasklet) |
14c998f0 MM |
502 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); |
503 | ||
504 | return err; | |
99ffc696 RR |
505 | } |
506 | ||
11a3a154 RR |
507 | static void xmit_tasklet(unsigned long data) |
508 | { | |
509 | struct virtnet_info *vi = (void *)data; | |
510 | ||
511 | netif_tx_lock_bh(vi->dev); | |
512 | if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) { | |
513 | vi->svq->vq_ops->kick(vi->svq); | |
514 | vi->last_xmit_skb = NULL; | |
515 | } | |
363f1514 RR |
516 | if (vi->free_in_tasklet) |
517 | free_old_xmit_skbs(vi); | |
11a3a154 RR |
518 | netif_tx_unlock_bh(vi->dev); |
519 | } | |
520 | ||
99ffc696 RR |
521 | static int start_xmit(struct sk_buff *skb, struct net_device *dev) |
522 | { | |
523 | struct virtnet_info *vi = netdev_priv(dev); | |
2cb9c6ba RR |
524 | |
525 | again: | |
526 | /* Free up any pending old buffers before queueing new ones. */ | |
527 | free_old_xmit_skbs(vi); | |
99ffc696 RR |
528 | |
529 | /* If we has a buffer left over from last time, send it now. */ | |
9953ca6c MM |
530 | if (unlikely(vi->last_xmit_skb) && |
531 | xmit_skb(vi, vi->last_xmit_skb) != 0) | |
532 | goto stop_queue; | |
533 | ||
534 | vi->last_xmit_skb = NULL; | |
2cb9c6ba | 535 | |
99ffc696 | 536 | /* Put new one in send queue and do transmit */ |
7eb2e251 RR |
537 | if (likely(skb)) { |
538 | __skb_queue_head(&vi->send, skb); | |
539 | if (xmit_skb(vi, skb) != 0) { | |
540 | vi->last_xmit_skb = skb; | |
541 | skb = NULL; | |
542 | goto stop_queue; | |
543 | } | |
296f96fc | 544 | } |
99ffc696 | 545 | done: |
296f96fc | 546 | vi->svq->vq_ops->kick(vi->svq); |
99ffc696 RR |
547 | return NETDEV_TX_OK; |
548 | ||
549 | stop_queue: | |
550 | pr_debug("%s: virtio not prepared to send\n", dev->name); | |
551 | netif_stop_queue(dev); | |
552 | ||
553 | /* Activate callback for using skbs: if this returns false it | |
554 | * means some were used in the meantime. */ | |
555 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
556 | vi->svq->vq_ops->disable_cb(vi->svq); | |
557 | netif_start_queue(dev); | |
558 | goto again; | |
559 | } | |
9953ca6c MM |
560 | if (skb) { |
561 | /* Drop this skb: we only queue one. */ | |
562 | vi->dev->stats.tx_dropped++; | |
563 | kfree_skb(skb); | |
564 | } | |
99ffc696 | 565 | goto done; |
296f96fc RR |
566 | } |
567 | ||
9c46f6d4 AW |
568 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
569 | { | |
570 | struct virtnet_info *vi = netdev_priv(dev); | |
571 | struct virtio_device *vdev = vi->vdev; | |
572 | int ret; | |
573 | ||
574 | ret = eth_mac_addr(dev, p); | |
575 | if (ret) | |
576 | return ret; | |
577 | ||
62994b2d AW |
578 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
579 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), | |
580 | dev->dev_addr, dev->addr_len); | |
9c46f6d4 AW |
581 | |
582 | return 0; | |
583 | } | |
584 | ||
da74e89d AS |
585 | #ifdef CONFIG_NET_POLL_CONTROLLER |
586 | static void virtnet_netpoll(struct net_device *dev) | |
587 | { | |
588 | struct virtnet_info *vi = netdev_priv(dev); | |
589 | ||
590 | napi_schedule(&vi->napi); | |
591 | } | |
592 | #endif | |
593 | ||
296f96fc RR |
594 | static int virtnet_open(struct net_device *dev) |
595 | { | |
596 | struct virtnet_info *vi = netdev_priv(dev); | |
597 | ||
296f96fc | 598 | napi_enable(&vi->napi); |
a48bd8f6 RR |
599 | |
600 | /* If all buffers were filled by other side before we napi_enabled, we | |
601 | * won't get another interrupt, so process any outstanding packets | |
370076d9 CB |
602 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
603 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
288379f0 | 604 | if (napi_schedule_prep(&vi->napi)) { |
370076d9 | 605 | vi->rvq->vq_ops->disable_cb(vi->rvq); |
288379f0 | 606 | __napi_schedule(&vi->napi); |
370076d9 | 607 | } |
296f96fc RR |
608 | return 0; |
609 | } | |
610 | ||
2a41f71d AW |
611 | /* |
612 | * Send command via the control virtqueue and check status. Commands | |
613 | * supported by the hypervisor, as indicated by feature bits, should | |
614 | * never fail unless improperly formated. | |
615 | */ | |
616 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
617 | struct scatterlist *data, int out, int in) | |
618 | { | |
23e258e1 | 619 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
2a41f71d AW |
620 | struct virtio_net_ctrl_hdr ctrl; |
621 | virtio_net_ctrl_ack status = ~0; | |
622 | unsigned int tmp; | |
23e258e1 | 623 | int i; |
2a41f71d | 624 | |
0ee904c3 AB |
625 | /* Caller should know better */ |
626 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || | |
627 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); | |
2a41f71d AW |
628 | |
629 | out++; /* Add header */ | |
630 | in++; /* Add return status */ | |
631 | ||
632 | ctrl.class = class; | |
633 | ctrl.cmd = cmd; | |
634 | ||
635 | sg_init_table(sg, out + in); | |
636 | ||
637 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); | |
23e258e1 AW |
638 | for_each_sg(data, s, out + in - 2, i) |
639 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); | |
2a41f71d AW |
640 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
641 | ||
0ee904c3 | 642 | BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi)); |
2a41f71d AW |
643 | |
644 | vi->cvq->vq_ops->kick(vi->cvq); | |
645 | ||
646 | /* | |
647 | * Spin for a response, the kick causes an ioport write, trapping | |
648 | * into the hypervisor, so the request should be handled immediately. | |
649 | */ | |
650 | while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp)) | |
651 | cpu_relax(); | |
652 | ||
653 | return status == VIRTIO_NET_OK; | |
654 | } | |
655 | ||
296f96fc RR |
656 | static int virtnet_close(struct net_device *dev) |
657 | { | |
658 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc RR |
659 | |
660 | napi_disable(&vi->napi); | |
661 | ||
296f96fc RR |
662 | return 0; |
663 | } | |
664 | ||
a9ea3fc6 HX |
665 | static int virtnet_set_tx_csum(struct net_device *dev, u32 data) |
666 | { | |
667 | struct virtnet_info *vi = netdev_priv(dev); | |
668 | struct virtio_device *vdev = vi->vdev; | |
669 | ||
670 | if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) | |
671 | return -ENOSYS; | |
672 | ||
673 | return ethtool_op_set_tx_hw_csum(dev, data); | |
674 | } | |
675 | ||
2af7698e AW |
676 | static void virtnet_set_rx_mode(struct net_device *dev) |
677 | { | |
678 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 679 | struct scatterlist sg[2]; |
2af7698e | 680 | u8 promisc, allmulti; |
f565a7c2 AW |
681 | struct virtio_net_ctrl_mac *mac_data; |
682 | struct dev_addr_list *addr; | |
683 | void *buf; | |
684 | int i; | |
2af7698e AW |
685 | |
686 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
687 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
688 | return; | |
689 | ||
f565a7c2 AW |
690 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
691 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 692 | |
23e258e1 | 693 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
694 | |
695 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
696 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f565a7c2 | 697 | sg, 1, 0)) |
2af7698e AW |
698 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
699 | promisc ? "en" : "dis"); | |
700 | ||
23e258e1 | 701 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
702 | |
703 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
704 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f565a7c2 | 705 | sg, 1, 0)) |
2af7698e AW |
706 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
707 | allmulti ? "en" : "dis"); | |
f565a7c2 AW |
708 | |
709 | /* MAC filter - use one buffer for both lists */ | |
710 | mac_data = buf = kzalloc(((dev->uc_count + dev->mc_count) * ETH_ALEN) + | |
711 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
712 | if (!buf) { | |
713 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); | |
714 | return; | |
715 | } | |
716 | ||
23e258e1 AW |
717 | sg_init_table(sg, 2); |
718 | ||
f565a7c2 AW |
719 | /* Store the unicast list and count in the front of the buffer */ |
720 | mac_data->entries = dev->uc_count; | |
721 | addr = dev->uc_list; | |
722 | for (i = 0; i < dev->uc_count; i++, addr = addr->next) | |
723 | memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN); | |
724 | ||
725 | sg_set_buf(&sg[0], mac_data, | |
726 | sizeof(mac_data->entries) + (dev->uc_count * ETH_ALEN)); | |
727 | ||
728 | /* multicast list and count fill the end */ | |
729 | mac_data = (void *)&mac_data->macs[dev->uc_count][0]; | |
730 | ||
731 | mac_data->entries = dev->mc_count; | |
732 | addr = dev->mc_list; | |
733 | for (i = 0; i < dev->mc_count; i++, addr = addr->next) | |
734 | memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN); | |
735 | ||
736 | sg_set_buf(&sg[1], mac_data, | |
737 | sizeof(mac_data->entries) + (dev->mc_count * ETH_ALEN)); | |
738 | ||
739 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
740 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
741 | sg, 2, 0)) | |
742 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); | |
743 | ||
744 | kfree(buf); | |
2af7698e AW |
745 | } |
746 | ||
1824a989 | 747 | static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
748 | { |
749 | struct virtnet_info *vi = netdev_priv(dev); | |
750 | struct scatterlist sg; | |
751 | ||
23e258e1 | 752 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
753 | |
754 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
755 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) | |
756 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); | |
757 | } | |
758 | ||
1824a989 | 759 | static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
760 | { |
761 | struct virtnet_info *vi = netdev_priv(dev); | |
762 | struct scatterlist sg; | |
763 | ||
23e258e1 | 764 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
765 | |
766 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
767 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) | |
768 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); | |
769 | } | |
770 | ||
a9ea3fc6 HX |
771 | static struct ethtool_ops virtnet_ethtool_ops = { |
772 | .set_tx_csum = virtnet_set_tx_csum, | |
773 | .set_sg = ethtool_op_set_sg, | |
0276b497 | 774 | .set_tso = ethtool_op_set_tso, |
9f4d26d0 | 775 | .get_link = ethtool_op_get_link, |
a9ea3fc6 HX |
776 | }; |
777 | ||
39da5814 MM |
778 | #define MIN_MTU 68 |
779 | #define MAX_MTU 65535 | |
780 | ||
781 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
782 | { | |
783 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
784 | return -EINVAL; | |
785 | dev->mtu = new_mtu; | |
786 | return 0; | |
787 | } | |
788 | ||
76288b4e SH |
789 | static const struct net_device_ops virtnet_netdev = { |
790 | .ndo_open = virtnet_open, | |
791 | .ndo_stop = virtnet_close, | |
792 | .ndo_start_xmit = start_xmit, | |
793 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 794 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 795 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 796 | .ndo_change_mtu = virtnet_change_mtu, |
1824a989 AW |
797 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
798 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
799 | #ifdef CONFIG_NET_POLL_CONTROLLER |
800 | .ndo_poll_controller = virtnet_netpoll, | |
801 | #endif | |
802 | }; | |
803 | ||
9f4d26d0 MM |
804 | static void virtnet_update_status(struct virtnet_info *vi) |
805 | { | |
806 | u16 v; | |
807 | ||
808 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) | |
809 | return; | |
810 | ||
811 | vi->vdev->config->get(vi->vdev, | |
812 | offsetof(struct virtio_net_config, status), | |
813 | &v, sizeof(v)); | |
814 | ||
815 | /* Ignore unknown (future) status bits */ | |
816 | v &= VIRTIO_NET_S_LINK_UP; | |
817 | ||
818 | if (vi->status == v) | |
819 | return; | |
820 | ||
821 | vi->status = v; | |
822 | ||
823 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
824 | netif_carrier_on(vi->dev); | |
825 | netif_wake_queue(vi->dev); | |
826 | } else { | |
827 | netif_carrier_off(vi->dev); | |
828 | netif_stop_queue(vi->dev); | |
829 | } | |
830 | } | |
831 | ||
832 | static void virtnet_config_changed(struct virtio_device *vdev) | |
833 | { | |
834 | struct virtnet_info *vi = vdev->priv; | |
835 | ||
836 | virtnet_update_status(vi); | |
837 | } | |
838 | ||
296f96fc RR |
839 | static int virtnet_probe(struct virtio_device *vdev) |
840 | { | |
841 | int err; | |
296f96fc RR |
842 | struct net_device *dev; |
843 | struct virtnet_info *vi; | |
296f96fc RR |
844 | |
845 | /* Allocate ourselves a network device with room for our info */ | |
846 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
847 | if (!dev) | |
848 | return -ENOMEM; | |
849 | ||
850 | /* Set up network device as normal. */ | |
76288b4e | 851 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 852 | dev->features = NETIF_F_HIGHDMA; |
a9ea3fc6 | 853 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
854 | SET_NETDEV_DEV(dev, &vdev->dev); |
855 | ||
856 | /* Do we support "hardware" checksums? */ | |
c45a6816 | 857 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc RR |
858 | /* This opens up the world of extra features. */ |
859 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
c45a6816 | 860 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
34a48579 RR |
861 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
862 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; | |
863 | } | |
5539ae96 | 864 | /* Individual feature bits: what can host handle? */ |
c45a6816 | 865 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
5539ae96 | 866 | dev->features |= NETIF_F_TSO; |
c45a6816 | 867 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
5539ae96 | 868 | dev->features |= NETIF_F_TSO6; |
c45a6816 | 869 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
5539ae96 | 870 | dev->features |= NETIF_F_TSO_ECN; |
c45a6816 | 871 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
5539ae96 | 872 | dev->features |= NETIF_F_UFO; |
296f96fc RR |
873 | } |
874 | ||
875 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
c45a6816 | 876 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
a586d4f6 RR |
877 | vdev->config->get(vdev, |
878 | offsetof(struct virtio_net_config, mac), | |
879 | dev->dev_addr, dev->addr_len); | |
62994b2d | 880 | } else |
296f96fc RR |
881 | random_ether_addr(dev->dev_addr); |
882 | ||
883 | /* Set up our device-specific information */ | |
884 | vi = netdev_priv(dev); | |
6c0cd7c0 | 885 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
886 | vi->dev = dev; |
887 | vi->vdev = vdev; | |
d9d5dcc8 | 888 | vdev->priv = vi; |
fb6813f4 | 889 | vi->pages = NULL; |
296f96fc | 890 | |
363f1514 RR |
891 | /* If they give us a callback when all buffers are done, we don't need |
892 | * the timer. */ | |
893 | vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY); | |
894 | ||
97402b96 HX |
895 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
896 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) | |
897 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) | |
898 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
899 | vi->big_packets = true; | |
900 | ||
3f2c31d9 MM |
901 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
902 | vi->mergeable_rx_bufs = true; | |
903 | ||
296f96fc | 904 | /* We expect two virtqueues, receive then send. */ |
a586d4f6 | 905 | vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done); |
296f96fc RR |
906 | if (IS_ERR(vi->rvq)) { |
907 | err = PTR_ERR(vi->rvq); | |
908 | goto free; | |
909 | } | |
910 | ||
a586d4f6 | 911 | vi->svq = vdev->config->find_vq(vdev, 1, skb_xmit_done); |
296f96fc RR |
912 | if (IS_ERR(vi->svq)) { |
913 | err = PTR_ERR(vi->svq); | |
914 | goto free_recv; | |
915 | } | |
916 | ||
2a41f71d AW |
917 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { |
918 | vi->cvq = vdev->config->find_vq(vdev, 2, NULL); | |
919 | if (IS_ERR(vi->cvq)) { | |
920 | err = PTR_ERR(vi->svq); | |
921 | goto free_send; | |
922 | } | |
0bde9569 AW |
923 | |
924 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) | |
925 | dev->features |= NETIF_F_HW_VLAN_FILTER; | |
2a41f71d AW |
926 | } |
927 | ||
296f96fc RR |
928 | /* Initialize our empty receive and send queues. */ |
929 | skb_queue_head_init(&vi->recv); | |
930 | skb_queue_head_init(&vi->send); | |
931 | ||
11a3a154 RR |
932 | tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi); |
933 | ||
363f1514 RR |
934 | if (!vi->free_in_tasklet) |
935 | setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi); | |
14c998f0 | 936 | |
296f96fc RR |
937 | err = register_netdev(dev); |
938 | if (err) { | |
939 | pr_debug("virtio_net: registering device failed\n"); | |
2a41f71d | 940 | goto free_ctrl; |
296f96fc | 941 | } |
b3369c1f RR |
942 | |
943 | /* Last of all, set up some receive buffers. */ | |
944 | try_fill_recv(vi); | |
945 | ||
946 | /* If we didn't even get one input buffer, we're useless. */ | |
947 | if (vi->num == 0) { | |
948 | err = -ENOMEM; | |
949 | goto unregister; | |
950 | } | |
951 | ||
9f4d26d0 MM |
952 | vi->status = VIRTIO_NET_S_LINK_UP; |
953 | virtnet_update_status(vi); | |
4783256e | 954 | netif_carrier_on(dev); |
9f4d26d0 | 955 | |
296f96fc | 956 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
957 | return 0; |
958 | ||
b3369c1f RR |
959 | unregister: |
960 | unregister_netdev(dev); | |
2a41f71d AW |
961 | free_ctrl: |
962 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) | |
963 | vdev->config->del_vq(vi->cvq); | |
296f96fc RR |
964 | free_send: |
965 | vdev->config->del_vq(vi->svq); | |
966 | free_recv: | |
967 | vdev->config->del_vq(vi->rvq); | |
968 | free: | |
969 | free_netdev(dev); | |
970 | return err; | |
971 | } | |
972 | ||
973 | static void virtnet_remove(struct virtio_device *vdev) | |
974 | { | |
74b2553f | 975 | struct virtnet_info *vi = vdev->priv; |
b3369c1f RR |
976 | struct sk_buff *skb; |
977 | ||
6e5aa7ef RR |
978 | /* Stop all the virtqueues. */ |
979 | vdev->config->reset(vdev); | |
980 | ||
363f1514 RR |
981 | if (!vi->free_in_tasklet) |
982 | del_timer_sync(&vi->xmit_free_timer); | |
14c998f0 | 983 | |
b3369c1f | 984 | /* Free our skbs in send and recv queues, if any. */ |
b3369c1f RR |
985 | while ((skb = __skb_dequeue(&vi->recv)) != NULL) { |
986 | kfree_skb(skb); | |
987 | vi->num--; | |
988 | } | |
288369cc | 989 | __skb_queue_purge(&vi->send); |
b3369c1f RR |
990 | |
991 | BUG_ON(vi->num != 0); | |
74b2553f RR |
992 | |
993 | vdev->config->del_vq(vi->svq); | |
994 | vdev->config->del_vq(vi->rvq); | |
2a41f71d AW |
995 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) |
996 | vdev->config->del_vq(vi->cvq); | |
74b2553f | 997 | unregister_netdev(vi->dev); |
fb6813f4 RR |
998 | |
999 | while (vi->pages) | |
1000 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); | |
1001 | ||
74b2553f | 1002 | free_netdev(vi->dev); |
296f96fc RR |
1003 | } |
1004 | ||
1005 | static struct virtio_device_id id_table[] = { | |
1006 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1007 | { 0 }, | |
1008 | }; | |
1009 | ||
c45a6816 | 1010 | static unsigned int features[] = { |
5e4fe5c4 MM |
1011 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1012 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1013 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 HX |
1014 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
1015 | VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */ | |
2a41f71d | 1016 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1017 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
97402b96 | 1018 | VIRTIO_F_NOTIFY_ON_EMPTY, |
c45a6816 RR |
1019 | }; |
1020 | ||
296f96fc | 1021 | static struct virtio_driver virtio_net = { |
c45a6816 RR |
1022 | .feature_table = features, |
1023 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1024 | .driver.name = KBUILD_MODNAME, |
1025 | .driver.owner = THIS_MODULE, | |
1026 | .id_table = id_table, | |
1027 | .probe = virtnet_probe, | |
1028 | .remove = __devexit_p(virtnet_remove), | |
9f4d26d0 | 1029 | .config_changed = virtnet_config_changed, |
296f96fc RR |
1030 | }; |
1031 | ||
1032 | static int __init init(void) | |
1033 | { | |
1034 | return register_virtio_driver(&virtio_net); | |
1035 | } | |
1036 | ||
1037 | static void __exit fini(void) | |
1038 | { | |
1039 | unregister_virtio_driver(&virtio_net); | |
1040 | } | |
1041 | module_init(init); | |
1042 | module_exit(fini); | |
1043 | ||
1044 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1045 | MODULE_DESCRIPTION("Virtio network driver"); | |
1046 | MODULE_LICENSE("GPL"); |