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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 | ||
363f1514 | 47 | /* If we need to free in a timer, this is it. */ |
14c998f0 MM |
48 | struct timer_list xmit_free_timer; |
49 | ||
296f96fc RR |
50 | /* Number of input buffers, and max we've ever had. */ |
51 | unsigned int num, max; | |
52 | ||
11a3a154 RR |
53 | /* For cleaning up after transmission. */ |
54 | struct tasklet_struct tasklet; | |
363f1514 | 55 | bool free_in_tasklet; |
11a3a154 | 56 | |
296f96fc RR |
57 | /* Receive & send queues. */ |
58 | struct sk_buff_head recv; | |
59 | struct sk_buff_head send; | |
60 | }; | |
61 | ||
62 | static inline struct virtio_net_hdr *skb_vnet_hdr(struct sk_buff *skb) | |
63 | { | |
64 | return (struct virtio_net_hdr *)skb->cb; | |
65 | } | |
66 | ||
67 | static inline void vnet_hdr_to_sg(struct scatterlist *sg, struct sk_buff *skb) | |
68 | { | |
69 | sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr)); | |
70 | } | |
71 | ||
2cb9c6ba | 72 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 73 | { |
2cb9c6ba | 74 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 75 | |
2cb9c6ba RR |
76 | /* Suppress further interrupts. */ |
77 | svq->vq_ops->disable_cb(svq); | |
11a3a154 | 78 | |
363f1514 | 79 | /* We were probably waiting for more output buffers. */ |
296f96fc | 80 | netif_wake_queue(vi->dev); |
11a3a154 RR |
81 | |
82 | /* Make sure we re-xmit last_xmit_skb: if there are no more packets | |
83 | * queued, start_xmit won't be called. */ | |
84 | tasklet_schedule(&vi->tasklet); | |
296f96fc RR |
85 | } |
86 | ||
87 | static void receive_skb(struct net_device *dev, struct sk_buff *skb, | |
88 | unsigned len) | |
89 | { | |
90 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); | |
91 | ||
92 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { | |
93 | pr_debug("%s: short packet %i\n", dev->name, len); | |
94 | dev->stats.rx_length_errors++; | |
95 | goto drop; | |
96 | } | |
97 | len -= sizeof(struct virtio_net_hdr); | |
98 | BUG_ON(len > MAX_PACKET_LEN); | |
99 | ||
100 | skb_trim(skb, len); | |
23cde76d | 101 | |
296f96fc RR |
102 | dev->stats.rx_bytes += skb->len; |
103 | dev->stats.rx_packets++; | |
104 | ||
105 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
106 | pr_debug("Needs csum!\n"); | |
f35d9d8a | 107 | if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset)) |
296f96fc | 108 | goto frame_err; |
296f96fc RR |
109 | } |
110 | ||
23cde76d MM |
111 | skb->protocol = eth_type_trans(skb, dev); |
112 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
113 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
114 | ||
296f96fc RR |
115 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
116 | pr_debug("GSO!\n"); | |
34a48579 | 117 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
118 | case VIRTIO_NET_HDR_GSO_TCPV4: |
119 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
120 | break; | |
296f96fc RR |
121 | case VIRTIO_NET_HDR_GSO_UDP: |
122 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
123 | break; | |
124 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
125 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
126 | break; | |
127 | default: | |
128 | if (net_ratelimit()) | |
129 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
130 | dev->name, hdr->gso_type); | |
131 | goto frame_err; | |
132 | } | |
133 | ||
34a48579 RR |
134 | if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) |
135 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
136 | ||
296f96fc RR |
137 | skb_shinfo(skb)->gso_size = hdr->gso_size; |
138 | if (skb_shinfo(skb)->gso_size == 0) { | |
139 | if (net_ratelimit()) | |
140 | printk(KERN_WARNING "%s: zero gso size.\n", | |
141 | dev->name); | |
142 | goto frame_err; | |
143 | } | |
144 | ||
145 | /* Header must be checked, and gso_segs computed. */ | |
146 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
147 | skb_shinfo(skb)->gso_segs = 0; | |
148 | } | |
149 | ||
150 | netif_receive_skb(skb); | |
151 | return; | |
152 | ||
153 | frame_err: | |
154 | dev->stats.rx_frame_errors++; | |
155 | drop: | |
156 | dev_kfree_skb(skb); | |
157 | } | |
158 | ||
159 | static void try_fill_recv(struct virtnet_info *vi) | |
160 | { | |
161 | struct sk_buff *skb; | |
05271685 | 162 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
296f96fc RR |
163 | int num, err; |
164 | ||
05271685 | 165 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
296f96fc RR |
166 | for (;;) { |
167 | skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN); | |
168 | if (unlikely(!skb)) | |
169 | break; | |
170 | ||
171 | skb_put(skb, MAX_PACKET_LEN); | |
172 | vnet_hdr_to_sg(sg, skb); | |
173 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; | |
174 | skb_queue_head(&vi->recv, skb); | |
175 | ||
176 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); | |
177 | if (err) { | |
178 | skb_unlink(skb, &vi->recv); | |
179 | kfree_skb(skb); | |
180 | break; | |
181 | } | |
182 | vi->num++; | |
183 | } | |
184 | if (unlikely(vi->num > vi->max)) | |
185 | vi->max = vi->num; | |
186 | vi->rvq->vq_ops->kick(vi->rvq); | |
187 | } | |
188 | ||
18445c4d | 189 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
190 | { |
191 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d RR |
192 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
193 | if (netif_rx_schedule_prep(vi->dev, &vi->napi)) { | |
194 | rvq->vq_ops->disable_cb(rvq); | |
195 | __netif_rx_schedule(vi->dev, &vi->napi); | |
196 | } | |
296f96fc RR |
197 | } |
198 | ||
199 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
200 | { | |
201 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
202 | struct sk_buff *skb = NULL; | |
203 | unsigned int len, received = 0; | |
204 | ||
205 | again: | |
206 | while (received < budget && | |
207 | (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { | |
208 | __skb_unlink(skb, &vi->recv); | |
209 | receive_skb(vi->dev, skb, len); | |
210 | vi->num--; | |
211 | received++; | |
212 | } | |
213 | ||
214 | /* FIXME: If we oom and completely run out of inbufs, we need | |
215 | * to start a timer trying to fill more. */ | |
216 | if (vi->num < vi->max / 2) | |
217 | try_fill_recv(vi); | |
218 | ||
8329d98e RR |
219 | /* Out of packets? */ |
220 | if (received < budget) { | |
296f96fc | 221 | netif_rx_complete(vi->dev, napi); |
18445c4d | 222 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) |
4265f161 CB |
223 | && napi_schedule_prep(napi)) { |
224 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
225 | __netif_rx_schedule(vi->dev, napi); | |
296f96fc | 226 | goto again; |
4265f161 | 227 | } |
296f96fc RR |
228 | } |
229 | ||
230 | return received; | |
231 | } | |
232 | ||
233 | static void free_old_xmit_skbs(struct virtnet_info *vi) | |
234 | { | |
235 | struct sk_buff *skb; | |
236 | unsigned int len; | |
237 | ||
238 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { | |
239 | pr_debug("Sent skb %p\n", skb); | |
240 | __skb_unlink(skb, &vi->send); | |
655aa31f | 241 | vi->dev->stats.tx_bytes += skb->len; |
296f96fc RR |
242 | vi->dev->stats.tx_packets++; |
243 | kfree_skb(skb); | |
244 | } | |
245 | } | |
246 | ||
363f1514 RR |
247 | /* If the virtio transport doesn't always notify us when all in-flight packets |
248 | * are consumed, we fall back to using this function on a timer to free them. */ | |
14c998f0 MM |
249 | static void xmit_free(unsigned long data) |
250 | { | |
251 | struct virtnet_info *vi = (void *)data; | |
252 | ||
253 | netif_tx_lock(vi->dev); | |
254 | ||
255 | free_old_xmit_skbs(vi); | |
256 | ||
257 | if (!skb_queue_empty(&vi->send)) | |
258 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); | |
259 | ||
260 | netif_tx_unlock(vi->dev); | |
261 | } | |
262 | ||
99ffc696 | 263 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 264 | { |
14c998f0 | 265 | int num, err; |
05271685 | 266 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
296f96fc RR |
267 | struct virtio_net_hdr *hdr; |
268 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; | |
296f96fc | 269 | |
05271685 | 270 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
4d125de3 | 271 | |
99ffc696 | 272 | pr_debug("%s: xmit %p " MAC_FMT "\n", vi->dev->name, skb, |
21f644f3 DM |
273 | dest[0], dest[1], dest[2], |
274 | dest[3], dest[4], dest[5]); | |
296f96fc | 275 | |
296f96fc RR |
276 | /* Encode metadata header at front. */ |
277 | hdr = skb_vnet_hdr(skb); | |
278 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
279 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
280 | hdr->csum_start = skb->csum_start - skb_headroom(skb); | |
281 | hdr->csum_offset = skb->csum_offset; | |
282 | } else { | |
283 | hdr->flags = 0; | |
284 | hdr->csum_offset = hdr->csum_start = 0; | |
285 | } | |
286 | ||
287 | if (skb_is_gso(skb)) { | |
50c8ea80 | 288 | hdr->hdr_len = skb_transport_header(skb) - skb->data; |
296f96fc | 289 | hdr->gso_size = skb_shinfo(skb)->gso_size; |
34a48579 | 290 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
296f96fc RR |
291 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
292 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) | |
293 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
294 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
295 | hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
296 | else | |
297 | BUG(); | |
34a48579 RR |
298 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
299 | hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
296f96fc RR |
300 | } else { |
301 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
50c8ea80 | 302 | hdr->gso_size = hdr->hdr_len = 0; |
296f96fc RR |
303 | } |
304 | ||
305 | vnet_hdr_to_sg(sg, skb); | |
306 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; | |
99ffc696 | 307 | |
14c998f0 | 308 | err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); |
363f1514 | 309 | if (!err && !vi->free_in_tasklet) |
14c998f0 MM |
310 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); |
311 | ||
312 | return err; | |
99ffc696 RR |
313 | } |
314 | ||
11a3a154 RR |
315 | static void xmit_tasklet(unsigned long data) |
316 | { | |
317 | struct virtnet_info *vi = (void *)data; | |
318 | ||
319 | netif_tx_lock_bh(vi->dev); | |
320 | if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) { | |
321 | vi->svq->vq_ops->kick(vi->svq); | |
322 | vi->last_xmit_skb = NULL; | |
323 | } | |
363f1514 RR |
324 | if (vi->free_in_tasklet) |
325 | free_old_xmit_skbs(vi); | |
11a3a154 RR |
326 | netif_tx_unlock_bh(vi->dev); |
327 | } | |
328 | ||
99ffc696 RR |
329 | static int start_xmit(struct sk_buff *skb, struct net_device *dev) |
330 | { | |
331 | struct virtnet_info *vi = netdev_priv(dev); | |
2cb9c6ba RR |
332 | |
333 | again: | |
334 | /* Free up any pending old buffers before queueing new ones. */ | |
335 | free_old_xmit_skbs(vi); | |
99ffc696 RR |
336 | |
337 | /* If we has a buffer left over from last time, send it now. */ | |
7eb2e251 | 338 | if (unlikely(vi->last_xmit_skb)) { |
99ffc696 RR |
339 | if (xmit_skb(vi, vi->last_xmit_skb) != 0) { |
340 | /* Drop this skb: we only queue one. */ | |
341 | vi->dev->stats.tx_dropped++; | |
342 | kfree_skb(skb); | |
7eb2e251 | 343 | skb = NULL; |
99ffc696 | 344 | goto stop_queue; |
2cb9c6ba | 345 | } |
99ffc696 RR |
346 | vi->last_xmit_skb = NULL; |
347 | } | |
2cb9c6ba | 348 | |
99ffc696 | 349 | /* Put new one in send queue and do transmit */ |
7eb2e251 RR |
350 | if (likely(skb)) { |
351 | __skb_queue_head(&vi->send, skb); | |
352 | if (xmit_skb(vi, skb) != 0) { | |
353 | vi->last_xmit_skb = skb; | |
354 | skb = NULL; | |
355 | goto stop_queue; | |
356 | } | |
296f96fc | 357 | } |
99ffc696 | 358 | done: |
296f96fc | 359 | vi->svq->vq_ops->kick(vi->svq); |
99ffc696 RR |
360 | return NETDEV_TX_OK; |
361 | ||
362 | stop_queue: | |
363 | pr_debug("%s: virtio not prepared to send\n", dev->name); | |
364 | netif_stop_queue(dev); | |
365 | ||
366 | /* Activate callback for using skbs: if this returns false it | |
367 | * means some were used in the meantime. */ | |
368 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
369 | vi->svq->vq_ops->disable_cb(vi->svq); | |
370 | netif_start_queue(dev); | |
371 | goto again; | |
372 | } | |
373 | goto done; | |
296f96fc RR |
374 | } |
375 | ||
da74e89d AS |
376 | #ifdef CONFIG_NET_POLL_CONTROLLER |
377 | static void virtnet_netpoll(struct net_device *dev) | |
378 | { | |
379 | struct virtnet_info *vi = netdev_priv(dev); | |
380 | ||
381 | napi_schedule(&vi->napi); | |
382 | } | |
383 | #endif | |
384 | ||
296f96fc RR |
385 | static int virtnet_open(struct net_device *dev) |
386 | { | |
387 | struct virtnet_info *vi = netdev_priv(dev); | |
388 | ||
296f96fc | 389 | napi_enable(&vi->napi); |
a48bd8f6 RR |
390 | |
391 | /* If all buffers were filled by other side before we napi_enabled, we | |
392 | * won't get another interrupt, so process any outstanding packets | |
370076d9 CB |
393 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
394 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
395 | if (netif_rx_schedule_prep(dev, &vi->napi)) { | |
396 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
397 | __netif_rx_schedule(dev, &vi->napi); | |
398 | } | |
296f96fc RR |
399 | return 0; |
400 | } | |
401 | ||
402 | static int virtnet_close(struct net_device *dev) | |
403 | { | |
404 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc RR |
405 | |
406 | napi_disable(&vi->napi); | |
407 | ||
296f96fc RR |
408 | return 0; |
409 | } | |
410 | ||
411 | static int virtnet_probe(struct virtio_device *vdev) | |
412 | { | |
413 | int err; | |
296f96fc RR |
414 | struct net_device *dev; |
415 | struct virtnet_info *vi; | |
296f96fc RR |
416 | |
417 | /* Allocate ourselves a network device with room for our info */ | |
418 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
419 | if (!dev) | |
420 | return -ENOMEM; | |
421 | ||
422 | /* Set up network device as normal. */ | |
296f96fc RR |
423 | dev->open = virtnet_open; |
424 | dev->stop = virtnet_close; | |
425 | dev->hard_start_xmit = start_xmit; | |
426 | dev->features = NETIF_F_HIGHDMA; | |
da74e89d AS |
427 | #ifdef CONFIG_NET_POLL_CONTROLLER |
428 | dev->poll_controller = virtnet_netpoll; | |
429 | #endif | |
296f96fc RR |
430 | SET_NETDEV_DEV(dev, &vdev->dev); |
431 | ||
432 | /* Do we support "hardware" checksums? */ | |
c45a6816 | 433 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc RR |
434 | /* This opens up the world of extra features. */ |
435 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
c45a6816 | 436 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
34a48579 RR |
437 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
438 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; | |
439 | } | |
5539ae96 | 440 | /* Individual feature bits: what can host handle? */ |
c45a6816 | 441 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
5539ae96 | 442 | dev->features |= NETIF_F_TSO; |
c45a6816 | 443 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
5539ae96 | 444 | dev->features |= NETIF_F_TSO6; |
c45a6816 | 445 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
5539ae96 | 446 | dev->features |= NETIF_F_TSO_ECN; |
c45a6816 | 447 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
5539ae96 | 448 | dev->features |= NETIF_F_UFO; |
296f96fc RR |
449 | } |
450 | ||
451 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
c45a6816 | 452 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
a586d4f6 RR |
453 | vdev->config->get(vdev, |
454 | offsetof(struct virtio_net_config, mac), | |
455 | dev->dev_addr, dev->addr_len); | |
296f96fc RR |
456 | } else |
457 | random_ether_addr(dev->dev_addr); | |
458 | ||
459 | /* Set up our device-specific information */ | |
460 | vi = netdev_priv(dev); | |
6c0cd7c0 | 461 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
462 | vi->dev = dev; |
463 | vi->vdev = vdev; | |
d9d5dcc8 | 464 | vdev->priv = vi; |
296f96fc | 465 | |
363f1514 RR |
466 | /* If they give us a callback when all buffers are done, we don't need |
467 | * the timer. */ | |
468 | vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY); | |
469 | ||
296f96fc | 470 | /* We expect two virtqueues, receive then send. */ |
a586d4f6 | 471 | vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done); |
296f96fc RR |
472 | if (IS_ERR(vi->rvq)) { |
473 | err = PTR_ERR(vi->rvq); | |
474 | goto free; | |
475 | } | |
476 | ||
a586d4f6 | 477 | vi->svq = vdev->config->find_vq(vdev, 1, skb_xmit_done); |
296f96fc RR |
478 | if (IS_ERR(vi->svq)) { |
479 | err = PTR_ERR(vi->svq); | |
480 | goto free_recv; | |
481 | } | |
482 | ||
483 | /* Initialize our empty receive and send queues. */ | |
484 | skb_queue_head_init(&vi->recv); | |
485 | skb_queue_head_init(&vi->send); | |
486 | ||
11a3a154 RR |
487 | tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi); |
488 | ||
363f1514 RR |
489 | if (!vi->free_in_tasklet) |
490 | setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi); | |
14c998f0 | 491 | |
296f96fc RR |
492 | err = register_netdev(dev); |
493 | if (err) { | |
494 | pr_debug("virtio_net: registering device failed\n"); | |
495 | goto free_send; | |
496 | } | |
b3369c1f RR |
497 | |
498 | /* Last of all, set up some receive buffers. */ | |
499 | try_fill_recv(vi); | |
500 | ||
501 | /* If we didn't even get one input buffer, we're useless. */ | |
502 | if (vi->num == 0) { | |
503 | err = -ENOMEM; | |
504 | goto unregister; | |
505 | } | |
506 | ||
296f96fc | 507 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
508 | return 0; |
509 | ||
b3369c1f RR |
510 | unregister: |
511 | unregister_netdev(dev); | |
296f96fc RR |
512 | free_send: |
513 | vdev->config->del_vq(vi->svq); | |
514 | free_recv: | |
515 | vdev->config->del_vq(vi->rvq); | |
516 | free: | |
517 | free_netdev(dev); | |
518 | return err; | |
519 | } | |
520 | ||
521 | static void virtnet_remove(struct virtio_device *vdev) | |
522 | { | |
74b2553f | 523 | struct virtnet_info *vi = vdev->priv; |
b3369c1f RR |
524 | struct sk_buff *skb; |
525 | ||
6e5aa7ef RR |
526 | /* Stop all the virtqueues. */ |
527 | vdev->config->reset(vdev); | |
528 | ||
363f1514 RR |
529 | if (!vi->free_in_tasklet) |
530 | del_timer_sync(&vi->xmit_free_timer); | |
14c998f0 | 531 | |
b3369c1f | 532 | /* Free our skbs in send and recv queues, if any. */ |
b3369c1f RR |
533 | while ((skb = __skb_dequeue(&vi->recv)) != NULL) { |
534 | kfree_skb(skb); | |
535 | vi->num--; | |
536 | } | |
288369cc | 537 | __skb_queue_purge(&vi->send); |
b3369c1f RR |
538 | |
539 | BUG_ON(vi->num != 0); | |
74b2553f RR |
540 | |
541 | vdev->config->del_vq(vi->svq); | |
542 | vdev->config->del_vq(vi->rvq); | |
543 | unregister_netdev(vi->dev); | |
544 | free_netdev(vi->dev); | |
296f96fc RR |
545 | } |
546 | ||
547 | static struct virtio_device_id id_table[] = { | |
548 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
549 | { 0 }, | |
550 | }; | |
551 | ||
c45a6816 | 552 | static unsigned int features[] = { |
5e4fe5c4 MM |
553 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
554 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 555 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
363f1514 | 556 | VIRTIO_NET_F_HOST_ECN, VIRTIO_F_NOTIFY_ON_EMPTY, |
c45a6816 RR |
557 | }; |
558 | ||
296f96fc | 559 | static struct virtio_driver virtio_net = { |
c45a6816 RR |
560 | .feature_table = features, |
561 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
562 | .driver.name = KBUILD_MODNAME, |
563 | .driver.owner = THIS_MODULE, | |
564 | .id_table = id_table, | |
565 | .probe = virtnet_probe, | |
566 | .remove = __devexit_p(virtnet_remove), | |
567 | }; | |
568 | ||
569 | static int __init init(void) | |
570 | { | |
571 | return register_virtio_driver(&virtio_net); | |
572 | } | |
573 | ||
574 | static void __exit fini(void) | |
575 | { | |
576 | unregister_virtio_driver(&virtio_net); | |
577 | } | |
578 | module_init(init); | |
579 | module_exit(fini); | |
580 | ||
581 | MODULE_DEVICE_TABLE(virtio, id_table); | |
582 | MODULE_DESCRIPTION("Virtio network driver"); | |
583 | MODULE_LICENSE("GPL"); |