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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> | |
27 | ||
6c0cd7c0 DL |
28 | static int napi_weight = 128; |
29 | module_param(napi_weight, int, 0444); | |
30 | ||
34a48579 RR |
31 | static int csum = 1, gso = 1; |
32 | module_param(csum, bool, 0444); | |
33 | module_param(gso, bool, 0444); | |
34 | ||
296f96fc RR |
35 | /* FIXME: MTU in config. */ |
36 | #define MAX_PACKET_LEN (ETH_HLEN+ETH_DATA_LEN) | |
37 | ||
38 | struct virtnet_info | |
39 | { | |
40 | struct virtio_device *vdev; | |
41 | struct virtqueue *rvq, *svq; | |
42 | struct net_device *dev; | |
43 | struct napi_struct napi; | |
44 | ||
99ffc696 RR |
45 | /* The skb we couldn't send because buffers were full. */ |
46 | struct sk_buff *last_xmit_skb; | |
47 | ||
363f1514 | 48 | /* If we need to free in a timer, this is it. */ |
14c998f0 MM |
49 | struct timer_list xmit_free_timer; |
50 | ||
296f96fc RR |
51 | /* Number of input buffers, and max we've ever had. */ |
52 | unsigned int num, max; | |
53 | ||
11a3a154 RR |
54 | /* For cleaning up after transmission. */ |
55 | struct tasklet_struct tasklet; | |
363f1514 | 56 | bool free_in_tasklet; |
11a3a154 | 57 | |
97402b96 HX |
58 | /* I like... big packets and I cannot lie! */ |
59 | bool big_packets; | |
60 | ||
296f96fc RR |
61 | /* Receive & send queues. */ |
62 | struct sk_buff_head recv; | |
63 | struct sk_buff_head send; | |
64 | }; | |
65 | ||
66 | static inline struct virtio_net_hdr *skb_vnet_hdr(struct sk_buff *skb) | |
67 | { | |
68 | return (struct virtio_net_hdr *)skb->cb; | |
69 | } | |
70 | ||
71 | static inline void vnet_hdr_to_sg(struct scatterlist *sg, struct sk_buff *skb) | |
72 | { | |
73 | sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr)); | |
74 | } | |
75 | ||
2cb9c6ba | 76 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 77 | { |
2cb9c6ba | 78 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 79 | |
2cb9c6ba RR |
80 | /* Suppress further interrupts. */ |
81 | svq->vq_ops->disable_cb(svq); | |
11a3a154 | 82 | |
363f1514 | 83 | /* We were probably waiting for more output buffers. */ |
296f96fc | 84 | netif_wake_queue(vi->dev); |
11a3a154 RR |
85 | |
86 | /* Make sure we re-xmit last_xmit_skb: if there are no more packets | |
87 | * queued, start_xmit won't be called. */ | |
88 | tasklet_schedule(&vi->tasklet); | |
296f96fc RR |
89 | } |
90 | ||
91 | static void receive_skb(struct net_device *dev, struct sk_buff *skb, | |
92 | unsigned len) | |
93 | { | |
94 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); | |
97402b96 | 95 | int err; |
296f96fc RR |
96 | |
97 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { | |
98 | pr_debug("%s: short packet %i\n", dev->name, len); | |
99 | dev->stats.rx_length_errors++; | |
100 | goto drop; | |
101 | } | |
102 | len -= sizeof(struct virtio_net_hdr); | |
23cde76d | 103 | |
97402b96 HX |
104 | err = pskb_trim(skb, len); |
105 | if (err) { | |
106 | pr_debug("%s: pskb_trim failed %i %d\n", dev->name, len, err); | |
107 | dev->stats.rx_dropped++; | |
108 | goto drop; | |
109 | } | |
110 | skb->truesize += skb->data_len; | |
296f96fc RR |
111 | dev->stats.rx_bytes += skb->len; |
112 | dev->stats.rx_packets++; | |
113 | ||
114 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
115 | pr_debug("Needs csum!\n"); | |
f35d9d8a | 116 | if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset)) |
296f96fc | 117 | goto frame_err; |
296f96fc RR |
118 | } |
119 | ||
23cde76d MM |
120 | skb->protocol = eth_type_trans(skb, dev); |
121 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
122 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
123 | ||
296f96fc RR |
124 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
125 | pr_debug("GSO!\n"); | |
34a48579 | 126 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
127 | case VIRTIO_NET_HDR_GSO_TCPV4: |
128 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
129 | break; | |
296f96fc RR |
130 | case VIRTIO_NET_HDR_GSO_UDP: |
131 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
132 | break; | |
133 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
134 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
135 | break; | |
136 | default: | |
137 | if (net_ratelimit()) | |
138 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
139 | dev->name, hdr->gso_type); | |
140 | goto frame_err; | |
141 | } | |
142 | ||
34a48579 RR |
143 | if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) |
144 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
145 | ||
296f96fc RR |
146 | skb_shinfo(skb)->gso_size = hdr->gso_size; |
147 | if (skb_shinfo(skb)->gso_size == 0) { | |
148 | if (net_ratelimit()) | |
149 | printk(KERN_WARNING "%s: zero gso size.\n", | |
150 | dev->name); | |
151 | goto frame_err; | |
152 | } | |
153 | ||
154 | /* Header must be checked, and gso_segs computed. */ | |
155 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
156 | skb_shinfo(skb)->gso_segs = 0; | |
157 | } | |
158 | ||
159 | netif_receive_skb(skb); | |
160 | return; | |
161 | ||
162 | frame_err: | |
163 | dev->stats.rx_frame_errors++; | |
164 | drop: | |
165 | dev_kfree_skb(skb); | |
166 | } | |
167 | ||
168 | static void try_fill_recv(struct virtnet_info *vi) | |
169 | { | |
170 | struct sk_buff *skb; | |
05271685 | 171 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
97402b96 | 172 | int num, err, i; |
296f96fc | 173 | |
05271685 | 174 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
296f96fc RR |
175 | for (;;) { |
176 | skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN); | |
177 | if (unlikely(!skb)) | |
178 | break; | |
179 | ||
180 | skb_put(skb, MAX_PACKET_LEN); | |
181 | vnet_hdr_to_sg(sg, skb); | |
97402b96 HX |
182 | |
183 | if (vi->big_packets) { | |
184 | for (i = 0; i < MAX_SKB_FRAGS; i++) { | |
185 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; | |
186 | f->page = alloc_page(GFP_ATOMIC); | |
187 | if (!f->page) | |
188 | break; | |
189 | ||
190 | f->page_offset = 0; | |
191 | f->size = PAGE_SIZE; | |
192 | ||
193 | skb->data_len += PAGE_SIZE; | |
194 | skb->len += PAGE_SIZE; | |
195 | ||
196 | skb_shinfo(skb)->nr_frags++; | |
197 | } | |
198 | } | |
199 | ||
296f96fc RR |
200 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
201 | skb_queue_head(&vi->recv, skb); | |
202 | ||
203 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); | |
204 | if (err) { | |
205 | skb_unlink(skb, &vi->recv); | |
206 | kfree_skb(skb); | |
207 | break; | |
208 | } | |
209 | vi->num++; | |
210 | } | |
211 | if (unlikely(vi->num > vi->max)) | |
212 | vi->max = vi->num; | |
213 | vi->rvq->vq_ops->kick(vi->rvq); | |
214 | } | |
215 | ||
18445c4d | 216 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
217 | { |
218 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d RR |
219 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
220 | if (netif_rx_schedule_prep(vi->dev, &vi->napi)) { | |
221 | rvq->vq_ops->disable_cb(rvq); | |
222 | __netif_rx_schedule(vi->dev, &vi->napi); | |
223 | } | |
296f96fc RR |
224 | } |
225 | ||
226 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
227 | { | |
228 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
229 | struct sk_buff *skb = NULL; | |
230 | unsigned int len, received = 0; | |
231 | ||
232 | again: | |
233 | while (received < budget && | |
234 | (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { | |
235 | __skb_unlink(skb, &vi->recv); | |
236 | receive_skb(vi->dev, skb, len); | |
237 | vi->num--; | |
238 | received++; | |
239 | } | |
240 | ||
241 | /* FIXME: If we oom and completely run out of inbufs, we need | |
242 | * to start a timer trying to fill more. */ | |
243 | if (vi->num < vi->max / 2) | |
244 | try_fill_recv(vi); | |
245 | ||
8329d98e RR |
246 | /* Out of packets? */ |
247 | if (received < budget) { | |
296f96fc | 248 | netif_rx_complete(vi->dev, napi); |
18445c4d | 249 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) |
4265f161 CB |
250 | && napi_schedule_prep(napi)) { |
251 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
252 | __netif_rx_schedule(vi->dev, napi); | |
296f96fc | 253 | goto again; |
4265f161 | 254 | } |
296f96fc RR |
255 | } |
256 | ||
257 | return received; | |
258 | } | |
259 | ||
260 | static void free_old_xmit_skbs(struct virtnet_info *vi) | |
261 | { | |
262 | struct sk_buff *skb; | |
263 | unsigned int len; | |
264 | ||
265 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { | |
266 | pr_debug("Sent skb %p\n", skb); | |
267 | __skb_unlink(skb, &vi->send); | |
655aa31f | 268 | vi->dev->stats.tx_bytes += skb->len; |
296f96fc RR |
269 | vi->dev->stats.tx_packets++; |
270 | kfree_skb(skb); | |
271 | } | |
272 | } | |
273 | ||
363f1514 RR |
274 | /* If the virtio transport doesn't always notify us when all in-flight packets |
275 | * are consumed, we fall back to using this function on a timer to free them. */ | |
14c998f0 MM |
276 | static void xmit_free(unsigned long data) |
277 | { | |
278 | struct virtnet_info *vi = (void *)data; | |
279 | ||
280 | netif_tx_lock(vi->dev); | |
281 | ||
282 | free_old_xmit_skbs(vi); | |
283 | ||
284 | if (!skb_queue_empty(&vi->send)) | |
285 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); | |
286 | ||
287 | netif_tx_unlock(vi->dev); | |
288 | } | |
289 | ||
99ffc696 | 290 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 291 | { |
14c998f0 | 292 | int num, err; |
05271685 | 293 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
296f96fc RR |
294 | struct virtio_net_hdr *hdr; |
295 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; | |
296f96fc | 296 | |
05271685 | 297 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
4d125de3 | 298 | |
99ffc696 | 299 | pr_debug("%s: xmit %p " MAC_FMT "\n", vi->dev->name, skb, |
21f644f3 DM |
300 | dest[0], dest[1], dest[2], |
301 | dest[3], dest[4], dest[5]); | |
296f96fc | 302 | |
296f96fc RR |
303 | /* Encode metadata header at front. */ |
304 | hdr = skb_vnet_hdr(skb); | |
305 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
306 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
307 | hdr->csum_start = skb->csum_start - skb_headroom(skb); | |
308 | hdr->csum_offset = skb->csum_offset; | |
309 | } else { | |
310 | hdr->flags = 0; | |
311 | hdr->csum_offset = hdr->csum_start = 0; | |
312 | } | |
313 | ||
314 | if (skb_is_gso(skb)) { | |
50c8ea80 | 315 | hdr->hdr_len = skb_transport_header(skb) - skb->data; |
296f96fc | 316 | hdr->gso_size = skb_shinfo(skb)->gso_size; |
34a48579 | 317 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
296f96fc RR |
318 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
319 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) | |
320 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
321 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
322 | hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
323 | else | |
324 | BUG(); | |
34a48579 RR |
325 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
326 | hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
296f96fc RR |
327 | } else { |
328 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
50c8ea80 | 329 | hdr->gso_size = hdr->hdr_len = 0; |
296f96fc RR |
330 | } |
331 | ||
332 | vnet_hdr_to_sg(sg, skb); | |
333 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; | |
99ffc696 | 334 | |
14c998f0 | 335 | err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); |
363f1514 | 336 | if (!err && !vi->free_in_tasklet) |
14c998f0 MM |
337 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); |
338 | ||
339 | return err; | |
99ffc696 RR |
340 | } |
341 | ||
11a3a154 RR |
342 | static void xmit_tasklet(unsigned long data) |
343 | { | |
344 | struct virtnet_info *vi = (void *)data; | |
345 | ||
346 | netif_tx_lock_bh(vi->dev); | |
347 | if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) { | |
348 | vi->svq->vq_ops->kick(vi->svq); | |
349 | vi->last_xmit_skb = NULL; | |
350 | } | |
363f1514 RR |
351 | if (vi->free_in_tasklet) |
352 | free_old_xmit_skbs(vi); | |
11a3a154 RR |
353 | netif_tx_unlock_bh(vi->dev); |
354 | } | |
355 | ||
99ffc696 RR |
356 | static int start_xmit(struct sk_buff *skb, struct net_device *dev) |
357 | { | |
358 | struct virtnet_info *vi = netdev_priv(dev); | |
2cb9c6ba RR |
359 | |
360 | again: | |
361 | /* Free up any pending old buffers before queueing new ones. */ | |
362 | free_old_xmit_skbs(vi); | |
99ffc696 RR |
363 | |
364 | /* If we has a buffer left over from last time, send it now. */ | |
9953ca6c MM |
365 | if (unlikely(vi->last_xmit_skb) && |
366 | xmit_skb(vi, vi->last_xmit_skb) != 0) | |
367 | goto stop_queue; | |
368 | ||
369 | vi->last_xmit_skb = NULL; | |
2cb9c6ba | 370 | |
99ffc696 | 371 | /* Put new one in send queue and do transmit */ |
7eb2e251 RR |
372 | if (likely(skb)) { |
373 | __skb_queue_head(&vi->send, skb); | |
374 | if (xmit_skb(vi, skb) != 0) { | |
375 | vi->last_xmit_skb = skb; | |
376 | skb = NULL; | |
377 | goto stop_queue; | |
378 | } | |
296f96fc | 379 | } |
99ffc696 | 380 | done: |
296f96fc | 381 | vi->svq->vq_ops->kick(vi->svq); |
99ffc696 RR |
382 | return NETDEV_TX_OK; |
383 | ||
384 | stop_queue: | |
385 | pr_debug("%s: virtio not prepared to send\n", dev->name); | |
386 | netif_stop_queue(dev); | |
387 | ||
388 | /* Activate callback for using skbs: if this returns false it | |
389 | * means some were used in the meantime. */ | |
390 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
391 | vi->svq->vq_ops->disable_cb(vi->svq); | |
392 | netif_start_queue(dev); | |
393 | goto again; | |
394 | } | |
9953ca6c MM |
395 | if (skb) { |
396 | /* Drop this skb: we only queue one. */ | |
397 | vi->dev->stats.tx_dropped++; | |
398 | kfree_skb(skb); | |
399 | } | |
99ffc696 | 400 | goto done; |
296f96fc RR |
401 | } |
402 | ||
da74e89d AS |
403 | #ifdef CONFIG_NET_POLL_CONTROLLER |
404 | static void virtnet_netpoll(struct net_device *dev) | |
405 | { | |
406 | struct virtnet_info *vi = netdev_priv(dev); | |
407 | ||
408 | napi_schedule(&vi->napi); | |
409 | } | |
410 | #endif | |
411 | ||
296f96fc RR |
412 | static int virtnet_open(struct net_device *dev) |
413 | { | |
414 | struct virtnet_info *vi = netdev_priv(dev); | |
415 | ||
296f96fc | 416 | napi_enable(&vi->napi); |
a48bd8f6 RR |
417 | |
418 | /* If all buffers were filled by other side before we napi_enabled, we | |
419 | * won't get another interrupt, so process any outstanding packets | |
370076d9 CB |
420 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
421 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
422 | if (netif_rx_schedule_prep(dev, &vi->napi)) { | |
423 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
424 | __netif_rx_schedule(dev, &vi->napi); | |
425 | } | |
296f96fc RR |
426 | return 0; |
427 | } | |
428 | ||
429 | static int virtnet_close(struct net_device *dev) | |
430 | { | |
431 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc RR |
432 | |
433 | napi_disable(&vi->napi); | |
434 | ||
296f96fc RR |
435 | return 0; |
436 | } | |
437 | ||
a9ea3fc6 HX |
438 | static int virtnet_set_tx_csum(struct net_device *dev, u32 data) |
439 | { | |
440 | struct virtnet_info *vi = netdev_priv(dev); | |
441 | struct virtio_device *vdev = vi->vdev; | |
442 | ||
443 | if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) | |
444 | return -ENOSYS; | |
445 | ||
446 | return ethtool_op_set_tx_hw_csum(dev, data); | |
447 | } | |
448 | ||
449 | static struct ethtool_ops virtnet_ethtool_ops = { | |
450 | .set_tx_csum = virtnet_set_tx_csum, | |
451 | .set_sg = ethtool_op_set_sg, | |
452 | }; | |
453 | ||
296f96fc RR |
454 | static int virtnet_probe(struct virtio_device *vdev) |
455 | { | |
456 | int err; | |
296f96fc RR |
457 | struct net_device *dev; |
458 | struct virtnet_info *vi; | |
296f96fc RR |
459 | |
460 | /* Allocate ourselves a network device with room for our info */ | |
461 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
462 | if (!dev) | |
463 | return -ENOMEM; | |
464 | ||
465 | /* Set up network device as normal. */ | |
296f96fc RR |
466 | dev->open = virtnet_open; |
467 | dev->stop = virtnet_close; | |
468 | dev->hard_start_xmit = start_xmit; | |
469 | dev->features = NETIF_F_HIGHDMA; | |
da74e89d AS |
470 | #ifdef CONFIG_NET_POLL_CONTROLLER |
471 | dev->poll_controller = virtnet_netpoll; | |
472 | #endif | |
a9ea3fc6 | 473 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
474 | SET_NETDEV_DEV(dev, &vdev->dev); |
475 | ||
476 | /* Do we support "hardware" checksums? */ | |
c45a6816 | 477 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc RR |
478 | /* This opens up the world of extra features. */ |
479 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
c45a6816 | 480 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
34a48579 RR |
481 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
482 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; | |
483 | } | |
5539ae96 | 484 | /* Individual feature bits: what can host handle? */ |
c45a6816 | 485 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
5539ae96 | 486 | dev->features |= NETIF_F_TSO; |
c45a6816 | 487 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
5539ae96 | 488 | dev->features |= NETIF_F_TSO6; |
c45a6816 | 489 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
5539ae96 | 490 | dev->features |= NETIF_F_TSO_ECN; |
c45a6816 | 491 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
5539ae96 | 492 | dev->features |= NETIF_F_UFO; |
296f96fc RR |
493 | } |
494 | ||
495 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
c45a6816 | 496 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
a586d4f6 RR |
497 | vdev->config->get(vdev, |
498 | offsetof(struct virtio_net_config, mac), | |
499 | dev->dev_addr, dev->addr_len); | |
296f96fc RR |
500 | } else |
501 | random_ether_addr(dev->dev_addr); | |
502 | ||
503 | /* Set up our device-specific information */ | |
504 | vi = netdev_priv(dev); | |
6c0cd7c0 | 505 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
506 | vi->dev = dev; |
507 | vi->vdev = vdev; | |
d9d5dcc8 | 508 | vdev->priv = vi; |
296f96fc | 509 | |
363f1514 RR |
510 | /* If they give us a callback when all buffers are done, we don't need |
511 | * the timer. */ | |
512 | vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY); | |
513 | ||
97402b96 HX |
514 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
515 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) | |
516 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) | |
517 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
518 | vi->big_packets = true; | |
519 | ||
296f96fc | 520 | /* We expect two virtqueues, receive then send. */ |
a586d4f6 | 521 | vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done); |
296f96fc RR |
522 | if (IS_ERR(vi->rvq)) { |
523 | err = PTR_ERR(vi->rvq); | |
524 | goto free; | |
525 | } | |
526 | ||
a586d4f6 | 527 | vi->svq = vdev->config->find_vq(vdev, 1, skb_xmit_done); |
296f96fc RR |
528 | if (IS_ERR(vi->svq)) { |
529 | err = PTR_ERR(vi->svq); | |
530 | goto free_recv; | |
531 | } | |
532 | ||
533 | /* Initialize our empty receive and send queues. */ | |
534 | skb_queue_head_init(&vi->recv); | |
535 | skb_queue_head_init(&vi->send); | |
536 | ||
11a3a154 RR |
537 | tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi); |
538 | ||
363f1514 RR |
539 | if (!vi->free_in_tasklet) |
540 | setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi); | |
14c998f0 | 541 | |
296f96fc RR |
542 | err = register_netdev(dev); |
543 | if (err) { | |
544 | pr_debug("virtio_net: registering device failed\n"); | |
545 | goto free_send; | |
546 | } | |
b3369c1f RR |
547 | |
548 | /* Last of all, set up some receive buffers. */ | |
549 | try_fill_recv(vi); | |
550 | ||
551 | /* If we didn't even get one input buffer, we're useless. */ | |
552 | if (vi->num == 0) { | |
553 | err = -ENOMEM; | |
554 | goto unregister; | |
555 | } | |
556 | ||
296f96fc | 557 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
558 | return 0; |
559 | ||
b3369c1f RR |
560 | unregister: |
561 | unregister_netdev(dev); | |
296f96fc RR |
562 | free_send: |
563 | vdev->config->del_vq(vi->svq); | |
564 | free_recv: | |
565 | vdev->config->del_vq(vi->rvq); | |
566 | free: | |
567 | free_netdev(dev); | |
568 | return err; | |
569 | } | |
570 | ||
571 | static void virtnet_remove(struct virtio_device *vdev) | |
572 | { | |
74b2553f | 573 | struct virtnet_info *vi = vdev->priv; |
b3369c1f RR |
574 | struct sk_buff *skb; |
575 | ||
6e5aa7ef RR |
576 | /* Stop all the virtqueues. */ |
577 | vdev->config->reset(vdev); | |
578 | ||
363f1514 RR |
579 | if (!vi->free_in_tasklet) |
580 | del_timer_sync(&vi->xmit_free_timer); | |
14c998f0 | 581 | |
b3369c1f | 582 | /* Free our skbs in send and recv queues, if any. */ |
b3369c1f RR |
583 | while ((skb = __skb_dequeue(&vi->recv)) != NULL) { |
584 | kfree_skb(skb); | |
585 | vi->num--; | |
586 | } | |
288369cc | 587 | __skb_queue_purge(&vi->send); |
b3369c1f RR |
588 | |
589 | BUG_ON(vi->num != 0); | |
74b2553f RR |
590 | |
591 | vdev->config->del_vq(vi->svq); | |
592 | vdev->config->del_vq(vi->rvq); | |
593 | unregister_netdev(vi->dev); | |
594 | free_netdev(vi->dev); | |
296f96fc RR |
595 | } |
596 | ||
597 | static struct virtio_device_id id_table[] = { | |
598 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
599 | { 0 }, | |
600 | }; | |
601 | ||
c45a6816 | 602 | static unsigned int features[] = { |
5e4fe5c4 MM |
603 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
604 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 605 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 HX |
606 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
607 | VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */ | |
608 | VIRTIO_F_NOTIFY_ON_EMPTY, | |
c45a6816 RR |
609 | }; |
610 | ||
296f96fc | 611 | static struct virtio_driver virtio_net = { |
c45a6816 RR |
612 | .feature_table = features, |
613 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
614 | .driver.name = KBUILD_MODNAME, |
615 | .driver.owner = THIS_MODULE, | |
616 | .id_table = id_table, | |
617 | .probe = virtnet_probe, | |
618 | .remove = __devexit_p(virtnet_remove), | |
619 | }; | |
620 | ||
621 | static int __init init(void) | |
622 | { | |
623 | return register_virtio_driver(&virtio_net); | |
624 | } | |
625 | ||
626 | static void __exit fini(void) | |
627 | { | |
628 | unregister_virtio_driver(&virtio_net); | |
629 | } | |
630 | module_init(init); | |
631 | module_exit(fini); | |
632 | ||
633 | MODULE_DEVICE_TABLE(virtio, id_table); | |
634 | MODULE_DESCRIPTION("Virtio network driver"); | |
635 | MODULE_LICENSE("GPL"); |