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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> | |
22 | #include <linux/module.h> | |
23 | #include <linux/virtio.h> | |
24 | #include <linux/virtio_net.h> | |
25 | #include <linux/scatterlist.h> | |
26 | ||
6c0cd7c0 DL |
27 | static int napi_weight = 128; |
28 | module_param(napi_weight, int, 0444); | |
29 | ||
34a48579 RR |
30 | static int csum = 1, gso = 1; |
31 | module_param(csum, bool, 0444); | |
32 | module_param(gso, bool, 0444); | |
33 | ||
296f96fc RR |
34 | /* FIXME: MTU in config. */ |
35 | #define MAX_PACKET_LEN (ETH_HLEN+ETH_DATA_LEN) | |
36 | ||
37 | struct virtnet_info | |
38 | { | |
39 | struct virtio_device *vdev; | |
40 | struct virtqueue *rvq, *svq; | |
41 | struct net_device *dev; | |
42 | struct napi_struct napi; | |
43 | ||
99ffc696 RR |
44 | /* The skb we couldn't send because buffers were full. */ |
45 | struct sk_buff *last_xmit_skb; | |
46 | ||
296f96fc RR |
47 | /* Number of input buffers, and max we've ever had. */ |
48 | unsigned int num, max; | |
49 | ||
11a3a154 RR |
50 | /* For cleaning up after transmission. */ |
51 | struct tasklet_struct tasklet; | |
52 | ||
296f96fc RR |
53 | /* Receive & send queues. */ |
54 | struct sk_buff_head recv; | |
55 | struct sk_buff_head send; | |
56 | }; | |
57 | ||
58 | static inline struct virtio_net_hdr *skb_vnet_hdr(struct sk_buff *skb) | |
59 | { | |
60 | return (struct virtio_net_hdr *)skb->cb; | |
61 | } | |
62 | ||
63 | static inline void vnet_hdr_to_sg(struct scatterlist *sg, struct sk_buff *skb) | |
64 | { | |
65 | sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr)); | |
66 | } | |
67 | ||
2cb9c6ba | 68 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 69 | { |
2cb9c6ba | 70 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 71 | |
2cb9c6ba RR |
72 | /* Suppress further interrupts. */ |
73 | svq->vq_ops->disable_cb(svq); | |
11a3a154 | 74 | |
2cb9c6ba | 75 | /* We were waiting for more output buffers. */ |
296f96fc | 76 | netif_wake_queue(vi->dev); |
11a3a154 RR |
77 | |
78 | /* Make sure we re-xmit last_xmit_skb: if there are no more packets | |
79 | * queued, start_xmit won't be called. */ | |
80 | tasklet_schedule(&vi->tasklet); | |
296f96fc RR |
81 | } |
82 | ||
83 | static void receive_skb(struct net_device *dev, struct sk_buff *skb, | |
84 | unsigned len) | |
85 | { | |
86 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); | |
87 | ||
88 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { | |
89 | pr_debug("%s: short packet %i\n", dev->name, len); | |
90 | dev->stats.rx_length_errors++; | |
91 | goto drop; | |
92 | } | |
93 | len -= sizeof(struct virtio_net_hdr); | |
94 | BUG_ON(len > MAX_PACKET_LEN); | |
95 | ||
96 | skb_trim(skb, len); | |
23cde76d | 97 | |
296f96fc RR |
98 | dev->stats.rx_bytes += skb->len; |
99 | dev->stats.rx_packets++; | |
100 | ||
101 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
102 | pr_debug("Needs csum!\n"); | |
f35d9d8a | 103 | if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset)) |
296f96fc | 104 | goto frame_err; |
296f96fc RR |
105 | } |
106 | ||
23cde76d MM |
107 | skb->protocol = eth_type_trans(skb, dev); |
108 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
109 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
110 | ||
296f96fc RR |
111 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
112 | pr_debug("GSO!\n"); | |
34a48579 | 113 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
114 | case VIRTIO_NET_HDR_GSO_TCPV4: |
115 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
116 | break; | |
296f96fc RR |
117 | case VIRTIO_NET_HDR_GSO_UDP: |
118 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
119 | break; | |
120 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
121 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
122 | break; | |
123 | default: | |
124 | if (net_ratelimit()) | |
125 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
126 | dev->name, hdr->gso_type); | |
127 | goto frame_err; | |
128 | } | |
129 | ||
34a48579 RR |
130 | if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) |
131 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
132 | ||
296f96fc RR |
133 | skb_shinfo(skb)->gso_size = hdr->gso_size; |
134 | if (skb_shinfo(skb)->gso_size == 0) { | |
135 | if (net_ratelimit()) | |
136 | printk(KERN_WARNING "%s: zero gso size.\n", | |
137 | dev->name); | |
138 | goto frame_err; | |
139 | } | |
140 | ||
141 | /* Header must be checked, and gso_segs computed. */ | |
142 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
143 | skb_shinfo(skb)->gso_segs = 0; | |
144 | } | |
145 | ||
146 | netif_receive_skb(skb); | |
147 | return; | |
148 | ||
149 | frame_err: | |
150 | dev->stats.rx_frame_errors++; | |
151 | drop: | |
152 | dev_kfree_skb(skb); | |
153 | } | |
154 | ||
155 | static void try_fill_recv(struct virtnet_info *vi) | |
156 | { | |
157 | struct sk_buff *skb; | |
05271685 | 158 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
296f96fc RR |
159 | int num, err; |
160 | ||
05271685 | 161 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
296f96fc RR |
162 | for (;;) { |
163 | skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN); | |
164 | if (unlikely(!skb)) | |
165 | break; | |
166 | ||
167 | skb_put(skb, MAX_PACKET_LEN); | |
168 | vnet_hdr_to_sg(sg, skb); | |
169 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; | |
170 | skb_queue_head(&vi->recv, skb); | |
171 | ||
172 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); | |
173 | if (err) { | |
174 | skb_unlink(skb, &vi->recv); | |
175 | kfree_skb(skb); | |
176 | break; | |
177 | } | |
178 | vi->num++; | |
179 | } | |
180 | if (unlikely(vi->num > vi->max)) | |
181 | vi->max = vi->num; | |
182 | vi->rvq->vq_ops->kick(vi->rvq); | |
183 | } | |
184 | ||
18445c4d | 185 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
186 | { |
187 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d RR |
188 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
189 | if (netif_rx_schedule_prep(vi->dev, &vi->napi)) { | |
190 | rvq->vq_ops->disable_cb(rvq); | |
191 | __netif_rx_schedule(vi->dev, &vi->napi); | |
192 | } | |
296f96fc RR |
193 | } |
194 | ||
195 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
196 | { | |
197 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
198 | struct sk_buff *skb = NULL; | |
199 | unsigned int len, received = 0; | |
200 | ||
201 | again: | |
202 | while (received < budget && | |
203 | (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { | |
204 | __skb_unlink(skb, &vi->recv); | |
205 | receive_skb(vi->dev, skb, len); | |
206 | vi->num--; | |
207 | received++; | |
208 | } | |
209 | ||
210 | /* FIXME: If we oom and completely run out of inbufs, we need | |
211 | * to start a timer trying to fill more. */ | |
212 | if (vi->num < vi->max / 2) | |
213 | try_fill_recv(vi); | |
214 | ||
8329d98e RR |
215 | /* Out of packets? */ |
216 | if (received < budget) { | |
296f96fc | 217 | netif_rx_complete(vi->dev, napi); |
18445c4d | 218 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) |
4265f161 CB |
219 | && napi_schedule_prep(napi)) { |
220 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
221 | __netif_rx_schedule(vi->dev, napi); | |
296f96fc | 222 | goto again; |
4265f161 | 223 | } |
296f96fc RR |
224 | } |
225 | ||
226 | return received; | |
227 | } | |
228 | ||
229 | static void free_old_xmit_skbs(struct virtnet_info *vi) | |
230 | { | |
231 | struct sk_buff *skb; | |
232 | unsigned int len; | |
233 | ||
234 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { | |
235 | pr_debug("Sent skb %p\n", skb); | |
236 | __skb_unlink(skb, &vi->send); | |
655aa31f | 237 | vi->dev->stats.tx_bytes += skb->len; |
296f96fc RR |
238 | vi->dev->stats.tx_packets++; |
239 | kfree_skb(skb); | |
240 | } | |
241 | } | |
242 | ||
99ffc696 | 243 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 244 | { |
99ffc696 | 245 | int num; |
05271685 | 246 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
296f96fc RR |
247 | struct virtio_net_hdr *hdr; |
248 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; | |
296f96fc | 249 | |
05271685 | 250 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
4d125de3 | 251 | |
99ffc696 | 252 | pr_debug("%s: xmit %p " MAC_FMT "\n", vi->dev->name, skb, |
21f644f3 DM |
253 | dest[0], dest[1], dest[2], |
254 | dest[3], dest[4], dest[5]); | |
296f96fc | 255 | |
296f96fc RR |
256 | /* Encode metadata header at front. */ |
257 | hdr = skb_vnet_hdr(skb); | |
258 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
259 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
260 | hdr->csum_start = skb->csum_start - skb_headroom(skb); | |
261 | hdr->csum_offset = skb->csum_offset; | |
262 | } else { | |
263 | hdr->flags = 0; | |
264 | hdr->csum_offset = hdr->csum_start = 0; | |
265 | } | |
266 | ||
267 | if (skb_is_gso(skb)) { | |
50c8ea80 | 268 | hdr->hdr_len = skb_transport_header(skb) - skb->data; |
296f96fc | 269 | hdr->gso_size = skb_shinfo(skb)->gso_size; |
34a48579 | 270 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
296f96fc RR |
271 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
272 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) | |
273 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
274 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
275 | hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
276 | else | |
277 | BUG(); | |
34a48579 RR |
278 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
279 | hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
296f96fc RR |
280 | } else { |
281 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
50c8ea80 | 282 | hdr->gso_size = hdr->hdr_len = 0; |
296f96fc RR |
283 | } |
284 | ||
285 | vnet_hdr_to_sg(sg, skb); | |
286 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; | |
99ffc696 RR |
287 | |
288 | return vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); | |
289 | } | |
290 | ||
11a3a154 RR |
291 | static void xmit_tasklet(unsigned long data) |
292 | { | |
293 | struct virtnet_info *vi = (void *)data; | |
294 | ||
295 | netif_tx_lock_bh(vi->dev); | |
296 | if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) { | |
297 | vi->svq->vq_ops->kick(vi->svq); | |
298 | vi->last_xmit_skb = NULL; | |
299 | } | |
300 | netif_tx_unlock_bh(vi->dev); | |
301 | } | |
302 | ||
99ffc696 RR |
303 | static int start_xmit(struct sk_buff *skb, struct net_device *dev) |
304 | { | |
305 | struct virtnet_info *vi = netdev_priv(dev); | |
2cb9c6ba RR |
306 | |
307 | again: | |
308 | /* Free up any pending old buffers before queueing new ones. */ | |
309 | free_old_xmit_skbs(vi); | |
99ffc696 RR |
310 | |
311 | /* If we has a buffer left over from last time, send it now. */ | |
7eb2e251 | 312 | if (unlikely(vi->last_xmit_skb)) { |
99ffc696 RR |
313 | if (xmit_skb(vi, vi->last_xmit_skb) != 0) { |
314 | /* Drop this skb: we only queue one. */ | |
315 | vi->dev->stats.tx_dropped++; | |
316 | kfree_skb(skb); | |
7eb2e251 | 317 | skb = NULL; |
99ffc696 | 318 | goto stop_queue; |
2cb9c6ba | 319 | } |
99ffc696 RR |
320 | vi->last_xmit_skb = NULL; |
321 | } | |
2cb9c6ba | 322 | |
99ffc696 | 323 | /* Put new one in send queue and do transmit */ |
7eb2e251 RR |
324 | if (likely(skb)) { |
325 | __skb_queue_head(&vi->send, skb); | |
326 | if (xmit_skb(vi, skb) != 0) { | |
327 | vi->last_xmit_skb = skb; | |
328 | skb = NULL; | |
329 | goto stop_queue; | |
330 | } | |
296f96fc | 331 | } |
99ffc696 | 332 | done: |
296f96fc | 333 | vi->svq->vq_ops->kick(vi->svq); |
99ffc696 RR |
334 | return NETDEV_TX_OK; |
335 | ||
336 | stop_queue: | |
337 | pr_debug("%s: virtio not prepared to send\n", dev->name); | |
338 | netif_stop_queue(dev); | |
339 | ||
340 | /* Activate callback for using skbs: if this returns false it | |
341 | * means some were used in the meantime. */ | |
342 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
343 | vi->svq->vq_ops->disable_cb(vi->svq); | |
344 | netif_start_queue(dev); | |
345 | goto again; | |
346 | } | |
347 | goto done; | |
296f96fc RR |
348 | } |
349 | ||
da74e89d AS |
350 | #ifdef CONFIG_NET_POLL_CONTROLLER |
351 | static void virtnet_netpoll(struct net_device *dev) | |
352 | { | |
353 | struct virtnet_info *vi = netdev_priv(dev); | |
354 | ||
355 | napi_schedule(&vi->napi); | |
356 | } | |
357 | #endif | |
358 | ||
296f96fc RR |
359 | static int virtnet_open(struct net_device *dev) |
360 | { | |
361 | struct virtnet_info *vi = netdev_priv(dev); | |
362 | ||
296f96fc | 363 | napi_enable(&vi->napi); |
a48bd8f6 RR |
364 | |
365 | /* If all buffers were filled by other side before we napi_enabled, we | |
366 | * won't get another interrupt, so process any outstanding packets | |
370076d9 CB |
367 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
368 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
369 | if (netif_rx_schedule_prep(dev, &vi->napi)) { | |
370 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
371 | __netif_rx_schedule(dev, &vi->napi); | |
372 | } | |
296f96fc RR |
373 | return 0; |
374 | } | |
375 | ||
376 | static int virtnet_close(struct net_device *dev) | |
377 | { | |
378 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc RR |
379 | |
380 | napi_disable(&vi->napi); | |
381 | ||
296f96fc RR |
382 | return 0; |
383 | } | |
384 | ||
385 | static int virtnet_probe(struct virtio_device *vdev) | |
386 | { | |
387 | int err; | |
296f96fc RR |
388 | struct net_device *dev; |
389 | struct virtnet_info *vi; | |
296f96fc RR |
390 | |
391 | /* Allocate ourselves a network device with room for our info */ | |
392 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
393 | if (!dev) | |
394 | return -ENOMEM; | |
395 | ||
396 | /* Set up network device as normal. */ | |
296f96fc RR |
397 | dev->open = virtnet_open; |
398 | dev->stop = virtnet_close; | |
399 | dev->hard_start_xmit = start_xmit; | |
400 | dev->features = NETIF_F_HIGHDMA; | |
da74e89d AS |
401 | #ifdef CONFIG_NET_POLL_CONTROLLER |
402 | dev->poll_controller = virtnet_netpoll; | |
403 | #endif | |
296f96fc RR |
404 | SET_NETDEV_DEV(dev, &vdev->dev); |
405 | ||
406 | /* Do we support "hardware" checksums? */ | |
c45a6816 | 407 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc RR |
408 | /* This opens up the world of extra features. */ |
409 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
c45a6816 | 410 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
34a48579 RR |
411 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
412 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; | |
413 | } | |
5539ae96 | 414 | /* Individual feature bits: what can host handle? */ |
c45a6816 | 415 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
5539ae96 | 416 | dev->features |= NETIF_F_TSO; |
c45a6816 | 417 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
5539ae96 | 418 | dev->features |= NETIF_F_TSO6; |
c45a6816 | 419 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
5539ae96 | 420 | dev->features |= NETIF_F_TSO_ECN; |
c45a6816 | 421 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
5539ae96 | 422 | dev->features |= NETIF_F_UFO; |
296f96fc RR |
423 | } |
424 | ||
425 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
c45a6816 | 426 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
a586d4f6 RR |
427 | vdev->config->get(vdev, |
428 | offsetof(struct virtio_net_config, mac), | |
429 | dev->dev_addr, dev->addr_len); | |
296f96fc RR |
430 | } else |
431 | random_ether_addr(dev->dev_addr); | |
432 | ||
433 | /* Set up our device-specific information */ | |
434 | vi = netdev_priv(dev); | |
6c0cd7c0 | 435 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
436 | vi->dev = dev; |
437 | vi->vdev = vdev; | |
d9d5dcc8 | 438 | vdev->priv = vi; |
296f96fc RR |
439 | |
440 | /* We expect two virtqueues, receive then send. */ | |
a586d4f6 | 441 | vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done); |
296f96fc RR |
442 | if (IS_ERR(vi->rvq)) { |
443 | err = PTR_ERR(vi->rvq); | |
444 | goto free; | |
445 | } | |
446 | ||
a586d4f6 | 447 | vi->svq = vdev->config->find_vq(vdev, 1, skb_xmit_done); |
296f96fc RR |
448 | if (IS_ERR(vi->svq)) { |
449 | err = PTR_ERR(vi->svq); | |
450 | goto free_recv; | |
451 | } | |
452 | ||
453 | /* Initialize our empty receive and send queues. */ | |
454 | skb_queue_head_init(&vi->recv); | |
455 | skb_queue_head_init(&vi->send); | |
456 | ||
11a3a154 RR |
457 | tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi); |
458 | ||
296f96fc RR |
459 | err = register_netdev(dev); |
460 | if (err) { | |
461 | pr_debug("virtio_net: registering device failed\n"); | |
462 | goto free_send; | |
463 | } | |
b3369c1f RR |
464 | |
465 | /* Last of all, set up some receive buffers. */ | |
466 | try_fill_recv(vi); | |
467 | ||
468 | /* If we didn't even get one input buffer, we're useless. */ | |
469 | if (vi->num == 0) { | |
470 | err = -ENOMEM; | |
471 | goto unregister; | |
472 | } | |
473 | ||
296f96fc | 474 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
475 | return 0; |
476 | ||
b3369c1f RR |
477 | unregister: |
478 | unregister_netdev(dev); | |
296f96fc RR |
479 | free_send: |
480 | vdev->config->del_vq(vi->svq); | |
481 | free_recv: | |
482 | vdev->config->del_vq(vi->rvq); | |
483 | free: | |
484 | free_netdev(dev); | |
485 | return err; | |
486 | } | |
487 | ||
488 | static void virtnet_remove(struct virtio_device *vdev) | |
489 | { | |
74b2553f | 490 | struct virtnet_info *vi = vdev->priv; |
b3369c1f RR |
491 | struct sk_buff *skb; |
492 | ||
6e5aa7ef RR |
493 | /* Stop all the virtqueues. */ |
494 | vdev->config->reset(vdev); | |
495 | ||
b3369c1f | 496 | /* Free our skbs in send and recv queues, if any. */ |
b3369c1f RR |
497 | while ((skb = __skb_dequeue(&vi->recv)) != NULL) { |
498 | kfree_skb(skb); | |
499 | vi->num--; | |
500 | } | |
288369cc | 501 | __skb_queue_purge(&vi->send); |
b3369c1f RR |
502 | |
503 | BUG_ON(vi->num != 0); | |
74b2553f RR |
504 | |
505 | vdev->config->del_vq(vi->svq); | |
506 | vdev->config->del_vq(vi->rvq); | |
507 | unregister_netdev(vi->dev); | |
508 | free_netdev(vi->dev); | |
296f96fc RR |
509 | } |
510 | ||
511 | static struct virtio_device_id id_table[] = { | |
512 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
513 | { 0 }, | |
514 | }; | |
515 | ||
c45a6816 RR |
516 | static unsigned int features[] = { |
517 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
518 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, | |
519 | VIRTIO_NET_F_HOST_ECN, | |
520 | }; | |
521 | ||
296f96fc | 522 | static struct virtio_driver virtio_net = { |
c45a6816 RR |
523 | .feature_table = features, |
524 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
525 | .driver.name = KBUILD_MODNAME, |
526 | .driver.owner = THIS_MODULE, | |
527 | .id_table = id_table, | |
528 | .probe = virtnet_probe, | |
529 | .remove = __devexit_p(virtnet_remove), | |
530 | }; | |
531 | ||
532 | static int __init init(void) | |
533 | { | |
534 | return register_virtio_driver(&virtio_net); | |
535 | } | |
536 | ||
537 | static void __exit fini(void) | |
538 | { | |
539 | unregister_virtio_driver(&virtio_net); | |
540 | } | |
541 | module_init(init); | |
542 | module_exit(fini); | |
543 | ||
544 | MODULE_DEVICE_TABLE(virtio, id_table); | |
545 | MODULE_DESCRIPTION("Virtio network driver"); | |
546 | MODULE_LICENSE("GPL"); |