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> | |
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; | |
fb6813f4 RR |
64 | |
65 | /* Chain pages by the private ptr. */ | |
66 | struct page *pages; | |
296f96fc RR |
67 | }; |
68 | ||
69 | static inline struct virtio_net_hdr *skb_vnet_hdr(struct sk_buff *skb) | |
70 | { | |
71 | return (struct virtio_net_hdr *)skb->cb; | |
72 | } | |
73 | ||
74 | static inline void vnet_hdr_to_sg(struct scatterlist *sg, struct sk_buff *skb) | |
75 | { | |
76 | sg_init_one(sg, skb_vnet_hdr(skb), sizeof(struct virtio_net_hdr)); | |
77 | } | |
78 | ||
fb6813f4 RR |
79 | static void give_a_page(struct virtnet_info *vi, struct page *page) |
80 | { | |
81 | page->private = (unsigned long)vi->pages; | |
82 | vi->pages = page; | |
83 | } | |
84 | ||
0a888fd1 MM |
85 | static void trim_pages(struct virtnet_info *vi, struct sk_buff *skb) |
86 | { | |
87 | unsigned int i; | |
88 | ||
89 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) | |
90 | give_a_page(vi, skb_shinfo(skb)->frags[i].page); | |
91 | skb_shinfo(skb)->nr_frags = 0; | |
92 | skb->data_len = 0; | |
93 | } | |
94 | ||
fb6813f4 RR |
95 | static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) |
96 | { | |
97 | struct page *p = vi->pages; | |
98 | ||
99 | if (p) | |
100 | vi->pages = (struct page *)p->private; | |
101 | else | |
102 | p = alloc_page(gfp_mask); | |
103 | return p; | |
104 | } | |
105 | ||
2cb9c6ba | 106 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 107 | { |
2cb9c6ba | 108 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 109 | |
2cb9c6ba RR |
110 | /* Suppress further interrupts. */ |
111 | svq->vq_ops->disable_cb(svq); | |
11a3a154 | 112 | |
363f1514 | 113 | /* We were probably waiting for more output buffers. */ |
296f96fc | 114 | netif_wake_queue(vi->dev); |
11a3a154 RR |
115 | |
116 | /* Make sure we re-xmit last_xmit_skb: if there are no more packets | |
117 | * queued, start_xmit won't be called. */ | |
118 | tasklet_schedule(&vi->tasklet); | |
296f96fc RR |
119 | } |
120 | ||
121 | static void receive_skb(struct net_device *dev, struct sk_buff *skb, | |
122 | unsigned len) | |
123 | { | |
124 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); | |
97402b96 | 125 | int err; |
296f96fc RR |
126 | |
127 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { | |
128 | pr_debug("%s: short packet %i\n", dev->name, len); | |
129 | dev->stats.rx_length_errors++; | |
130 | goto drop; | |
131 | } | |
132 | len -= sizeof(struct virtio_net_hdr); | |
23cde76d | 133 | |
0a888fd1 MM |
134 | if (len <= MAX_PACKET_LEN) |
135 | trim_pages(netdev_priv(dev), skb); | |
fb6813f4 | 136 | |
97402b96 HX |
137 | err = pskb_trim(skb, len); |
138 | if (err) { | |
139 | pr_debug("%s: pskb_trim failed %i %d\n", dev->name, len, err); | |
140 | dev->stats.rx_dropped++; | |
141 | goto drop; | |
142 | } | |
143 | skb->truesize += skb->data_len; | |
296f96fc RR |
144 | dev->stats.rx_bytes += skb->len; |
145 | dev->stats.rx_packets++; | |
146 | ||
147 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
148 | pr_debug("Needs csum!\n"); | |
f35d9d8a | 149 | if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset)) |
296f96fc | 150 | goto frame_err; |
296f96fc RR |
151 | } |
152 | ||
23cde76d MM |
153 | skb->protocol = eth_type_trans(skb, dev); |
154 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
155 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
156 | ||
296f96fc RR |
157 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
158 | pr_debug("GSO!\n"); | |
34a48579 | 159 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
160 | case VIRTIO_NET_HDR_GSO_TCPV4: |
161 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
162 | break; | |
296f96fc RR |
163 | case VIRTIO_NET_HDR_GSO_UDP: |
164 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
165 | break; | |
166 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
167 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
168 | break; | |
169 | default: | |
170 | if (net_ratelimit()) | |
171 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
172 | dev->name, hdr->gso_type); | |
173 | goto frame_err; | |
174 | } | |
175 | ||
34a48579 RR |
176 | if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) |
177 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
178 | ||
296f96fc RR |
179 | skb_shinfo(skb)->gso_size = hdr->gso_size; |
180 | if (skb_shinfo(skb)->gso_size == 0) { | |
181 | if (net_ratelimit()) | |
182 | printk(KERN_WARNING "%s: zero gso size.\n", | |
183 | dev->name); | |
184 | goto frame_err; | |
185 | } | |
186 | ||
187 | /* Header must be checked, and gso_segs computed. */ | |
188 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
189 | skb_shinfo(skb)->gso_segs = 0; | |
190 | } | |
191 | ||
192 | netif_receive_skb(skb); | |
193 | return; | |
194 | ||
195 | frame_err: | |
196 | dev->stats.rx_frame_errors++; | |
197 | drop: | |
198 | dev_kfree_skb(skb); | |
199 | } | |
200 | ||
201 | static void try_fill_recv(struct virtnet_info *vi) | |
202 | { | |
203 | struct sk_buff *skb; | |
05271685 | 204 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
97402b96 | 205 | int num, err, i; |
296f96fc | 206 | |
05271685 | 207 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
296f96fc RR |
208 | for (;;) { |
209 | skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN); | |
210 | if (unlikely(!skb)) | |
211 | break; | |
212 | ||
213 | skb_put(skb, MAX_PACKET_LEN); | |
214 | vnet_hdr_to_sg(sg, skb); | |
97402b96 HX |
215 | |
216 | if (vi->big_packets) { | |
217 | for (i = 0; i < MAX_SKB_FRAGS; i++) { | |
218 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; | |
fb6813f4 | 219 | f->page = get_a_page(vi, GFP_ATOMIC); |
97402b96 HX |
220 | if (!f->page) |
221 | break; | |
222 | ||
223 | f->page_offset = 0; | |
224 | f->size = PAGE_SIZE; | |
225 | ||
226 | skb->data_len += PAGE_SIZE; | |
227 | skb->len += PAGE_SIZE; | |
228 | ||
229 | skb_shinfo(skb)->nr_frags++; | |
230 | } | |
231 | } | |
232 | ||
296f96fc RR |
233 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
234 | skb_queue_head(&vi->recv, skb); | |
235 | ||
236 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); | |
237 | if (err) { | |
238 | skb_unlink(skb, &vi->recv); | |
0a888fd1 | 239 | trim_pages(vi, skb); |
296f96fc RR |
240 | kfree_skb(skb); |
241 | break; | |
242 | } | |
243 | vi->num++; | |
244 | } | |
245 | if (unlikely(vi->num > vi->max)) | |
246 | vi->max = vi->num; | |
247 | vi->rvq->vq_ops->kick(vi->rvq); | |
248 | } | |
249 | ||
18445c4d | 250 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
251 | { |
252 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d RR |
253 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
254 | if (netif_rx_schedule_prep(vi->dev, &vi->napi)) { | |
255 | rvq->vq_ops->disable_cb(rvq); | |
256 | __netif_rx_schedule(vi->dev, &vi->napi); | |
257 | } | |
296f96fc RR |
258 | } |
259 | ||
260 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
261 | { | |
262 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
263 | struct sk_buff *skb = NULL; | |
264 | unsigned int len, received = 0; | |
265 | ||
266 | again: | |
267 | while (received < budget && | |
268 | (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { | |
269 | __skb_unlink(skb, &vi->recv); | |
270 | receive_skb(vi->dev, skb, len); | |
271 | vi->num--; | |
272 | received++; | |
273 | } | |
274 | ||
275 | /* FIXME: If we oom and completely run out of inbufs, we need | |
276 | * to start a timer trying to fill more. */ | |
277 | if (vi->num < vi->max / 2) | |
278 | try_fill_recv(vi); | |
279 | ||
8329d98e RR |
280 | /* Out of packets? */ |
281 | if (received < budget) { | |
296f96fc | 282 | netif_rx_complete(vi->dev, napi); |
18445c4d | 283 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) |
4265f161 CB |
284 | && napi_schedule_prep(napi)) { |
285 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
286 | __netif_rx_schedule(vi->dev, napi); | |
296f96fc | 287 | goto again; |
4265f161 | 288 | } |
296f96fc RR |
289 | } |
290 | ||
291 | return received; | |
292 | } | |
293 | ||
294 | static void free_old_xmit_skbs(struct virtnet_info *vi) | |
295 | { | |
296 | struct sk_buff *skb; | |
297 | unsigned int len; | |
298 | ||
299 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { | |
300 | pr_debug("Sent skb %p\n", skb); | |
301 | __skb_unlink(skb, &vi->send); | |
655aa31f | 302 | vi->dev->stats.tx_bytes += skb->len; |
296f96fc RR |
303 | vi->dev->stats.tx_packets++; |
304 | kfree_skb(skb); | |
305 | } | |
306 | } | |
307 | ||
363f1514 RR |
308 | /* If the virtio transport doesn't always notify us when all in-flight packets |
309 | * are consumed, we fall back to using this function on a timer to free them. */ | |
14c998f0 MM |
310 | static void xmit_free(unsigned long data) |
311 | { | |
312 | struct virtnet_info *vi = (void *)data; | |
313 | ||
314 | netif_tx_lock(vi->dev); | |
315 | ||
316 | free_old_xmit_skbs(vi); | |
317 | ||
318 | if (!skb_queue_empty(&vi->send)) | |
319 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); | |
320 | ||
321 | netif_tx_unlock(vi->dev); | |
322 | } | |
323 | ||
99ffc696 | 324 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 325 | { |
14c998f0 | 326 | int num, err; |
05271685 | 327 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
296f96fc RR |
328 | struct virtio_net_hdr *hdr; |
329 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; | |
296f96fc | 330 | |
05271685 | 331 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
4d125de3 | 332 | |
e174961c | 333 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 334 | |
296f96fc RR |
335 | /* Encode metadata header at front. */ |
336 | hdr = skb_vnet_hdr(skb); | |
337 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
338 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
339 | hdr->csum_start = skb->csum_start - skb_headroom(skb); | |
340 | hdr->csum_offset = skb->csum_offset; | |
341 | } else { | |
342 | hdr->flags = 0; | |
343 | hdr->csum_offset = hdr->csum_start = 0; | |
344 | } | |
345 | ||
346 | if (skb_is_gso(skb)) { | |
50c8ea80 | 347 | hdr->hdr_len = skb_transport_header(skb) - skb->data; |
296f96fc | 348 | hdr->gso_size = skb_shinfo(skb)->gso_size; |
34a48579 | 349 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
296f96fc RR |
350 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
351 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) | |
352 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
353 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
354 | hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
355 | else | |
356 | BUG(); | |
34a48579 RR |
357 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
358 | hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
296f96fc RR |
359 | } else { |
360 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
50c8ea80 | 361 | hdr->gso_size = hdr->hdr_len = 0; |
296f96fc RR |
362 | } |
363 | ||
364 | vnet_hdr_to_sg(sg, skb); | |
365 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; | |
99ffc696 | 366 | |
14c998f0 | 367 | err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); |
363f1514 | 368 | if (!err && !vi->free_in_tasklet) |
14c998f0 MM |
369 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); |
370 | ||
371 | return err; | |
99ffc696 RR |
372 | } |
373 | ||
11a3a154 RR |
374 | static void xmit_tasklet(unsigned long data) |
375 | { | |
376 | struct virtnet_info *vi = (void *)data; | |
377 | ||
378 | netif_tx_lock_bh(vi->dev); | |
379 | if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) { | |
380 | vi->svq->vq_ops->kick(vi->svq); | |
381 | vi->last_xmit_skb = NULL; | |
382 | } | |
363f1514 RR |
383 | if (vi->free_in_tasklet) |
384 | free_old_xmit_skbs(vi); | |
11a3a154 RR |
385 | netif_tx_unlock_bh(vi->dev); |
386 | } | |
387 | ||
99ffc696 RR |
388 | static int start_xmit(struct sk_buff *skb, struct net_device *dev) |
389 | { | |
390 | struct virtnet_info *vi = netdev_priv(dev); | |
2cb9c6ba RR |
391 | |
392 | again: | |
393 | /* Free up any pending old buffers before queueing new ones. */ | |
394 | free_old_xmit_skbs(vi); | |
99ffc696 RR |
395 | |
396 | /* If we has a buffer left over from last time, send it now. */ | |
9953ca6c MM |
397 | if (unlikely(vi->last_xmit_skb) && |
398 | xmit_skb(vi, vi->last_xmit_skb) != 0) | |
399 | goto stop_queue; | |
400 | ||
401 | vi->last_xmit_skb = NULL; | |
2cb9c6ba | 402 | |
99ffc696 | 403 | /* Put new one in send queue and do transmit */ |
7eb2e251 RR |
404 | if (likely(skb)) { |
405 | __skb_queue_head(&vi->send, skb); | |
406 | if (xmit_skb(vi, skb) != 0) { | |
407 | vi->last_xmit_skb = skb; | |
408 | skb = NULL; | |
409 | goto stop_queue; | |
410 | } | |
296f96fc | 411 | } |
99ffc696 | 412 | done: |
296f96fc | 413 | vi->svq->vq_ops->kick(vi->svq); |
99ffc696 RR |
414 | return NETDEV_TX_OK; |
415 | ||
416 | stop_queue: | |
417 | pr_debug("%s: virtio not prepared to send\n", dev->name); | |
418 | netif_stop_queue(dev); | |
419 | ||
420 | /* Activate callback for using skbs: if this returns false it | |
421 | * means some were used in the meantime. */ | |
422 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
423 | vi->svq->vq_ops->disable_cb(vi->svq); | |
424 | netif_start_queue(dev); | |
425 | goto again; | |
426 | } | |
9953ca6c MM |
427 | if (skb) { |
428 | /* Drop this skb: we only queue one. */ | |
429 | vi->dev->stats.tx_dropped++; | |
430 | kfree_skb(skb); | |
431 | } | |
99ffc696 | 432 | goto done; |
296f96fc RR |
433 | } |
434 | ||
da74e89d AS |
435 | #ifdef CONFIG_NET_POLL_CONTROLLER |
436 | static void virtnet_netpoll(struct net_device *dev) | |
437 | { | |
438 | struct virtnet_info *vi = netdev_priv(dev); | |
439 | ||
440 | napi_schedule(&vi->napi); | |
441 | } | |
442 | #endif | |
443 | ||
296f96fc RR |
444 | static int virtnet_open(struct net_device *dev) |
445 | { | |
446 | struct virtnet_info *vi = netdev_priv(dev); | |
447 | ||
296f96fc | 448 | napi_enable(&vi->napi); |
a48bd8f6 RR |
449 | |
450 | /* If all buffers were filled by other side before we napi_enabled, we | |
451 | * won't get another interrupt, so process any outstanding packets | |
370076d9 CB |
452 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
453 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
454 | if (netif_rx_schedule_prep(dev, &vi->napi)) { | |
455 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
456 | __netif_rx_schedule(dev, &vi->napi); | |
457 | } | |
296f96fc RR |
458 | return 0; |
459 | } | |
460 | ||
461 | static int virtnet_close(struct net_device *dev) | |
462 | { | |
463 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc RR |
464 | |
465 | napi_disable(&vi->napi); | |
466 | ||
296f96fc RR |
467 | return 0; |
468 | } | |
469 | ||
a9ea3fc6 HX |
470 | static int virtnet_set_tx_csum(struct net_device *dev, u32 data) |
471 | { | |
472 | struct virtnet_info *vi = netdev_priv(dev); | |
473 | struct virtio_device *vdev = vi->vdev; | |
474 | ||
475 | if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) | |
476 | return -ENOSYS; | |
477 | ||
478 | return ethtool_op_set_tx_hw_csum(dev, data); | |
479 | } | |
480 | ||
481 | static struct ethtool_ops virtnet_ethtool_ops = { | |
482 | .set_tx_csum = virtnet_set_tx_csum, | |
483 | .set_sg = ethtool_op_set_sg, | |
0276b497 | 484 | .set_tso = ethtool_op_set_tso, |
a9ea3fc6 HX |
485 | }; |
486 | ||
296f96fc RR |
487 | static int virtnet_probe(struct virtio_device *vdev) |
488 | { | |
489 | int err; | |
296f96fc RR |
490 | struct net_device *dev; |
491 | struct virtnet_info *vi; | |
296f96fc RR |
492 | |
493 | /* Allocate ourselves a network device with room for our info */ | |
494 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
495 | if (!dev) | |
496 | return -ENOMEM; | |
497 | ||
498 | /* Set up network device as normal. */ | |
296f96fc RR |
499 | dev->open = virtnet_open; |
500 | dev->stop = virtnet_close; | |
501 | dev->hard_start_xmit = start_xmit; | |
502 | dev->features = NETIF_F_HIGHDMA; | |
da74e89d AS |
503 | #ifdef CONFIG_NET_POLL_CONTROLLER |
504 | dev->poll_controller = virtnet_netpoll; | |
505 | #endif | |
a9ea3fc6 | 506 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
507 | SET_NETDEV_DEV(dev, &vdev->dev); |
508 | ||
509 | /* Do we support "hardware" checksums? */ | |
c45a6816 | 510 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc RR |
511 | /* This opens up the world of extra features. */ |
512 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
c45a6816 | 513 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
34a48579 RR |
514 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
515 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; | |
516 | } | |
5539ae96 | 517 | /* Individual feature bits: what can host handle? */ |
c45a6816 | 518 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
5539ae96 | 519 | dev->features |= NETIF_F_TSO; |
c45a6816 | 520 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
5539ae96 | 521 | dev->features |= NETIF_F_TSO6; |
c45a6816 | 522 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
5539ae96 | 523 | dev->features |= NETIF_F_TSO_ECN; |
c45a6816 | 524 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
5539ae96 | 525 | dev->features |= NETIF_F_UFO; |
296f96fc RR |
526 | } |
527 | ||
528 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
c45a6816 | 529 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
a586d4f6 RR |
530 | vdev->config->get(vdev, |
531 | offsetof(struct virtio_net_config, mac), | |
532 | dev->dev_addr, dev->addr_len); | |
296f96fc RR |
533 | } else |
534 | random_ether_addr(dev->dev_addr); | |
535 | ||
536 | /* Set up our device-specific information */ | |
537 | vi = netdev_priv(dev); | |
6c0cd7c0 | 538 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
539 | vi->dev = dev; |
540 | vi->vdev = vdev; | |
d9d5dcc8 | 541 | vdev->priv = vi; |
fb6813f4 | 542 | vi->pages = NULL; |
296f96fc | 543 | |
363f1514 RR |
544 | /* If they give us a callback when all buffers are done, we don't need |
545 | * the timer. */ | |
546 | vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY); | |
547 | ||
97402b96 HX |
548 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
549 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) | |
550 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) | |
551 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
552 | vi->big_packets = true; | |
553 | ||
296f96fc | 554 | /* We expect two virtqueues, receive then send. */ |
a586d4f6 | 555 | vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done); |
296f96fc RR |
556 | if (IS_ERR(vi->rvq)) { |
557 | err = PTR_ERR(vi->rvq); | |
558 | goto free; | |
559 | } | |
560 | ||
a586d4f6 | 561 | vi->svq = vdev->config->find_vq(vdev, 1, skb_xmit_done); |
296f96fc RR |
562 | if (IS_ERR(vi->svq)) { |
563 | err = PTR_ERR(vi->svq); | |
564 | goto free_recv; | |
565 | } | |
566 | ||
567 | /* Initialize our empty receive and send queues. */ | |
568 | skb_queue_head_init(&vi->recv); | |
569 | skb_queue_head_init(&vi->send); | |
570 | ||
11a3a154 RR |
571 | tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi); |
572 | ||
363f1514 RR |
573 | if (!vi->free_in_tasklet) |
574 | setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi); | |
14c998f0 | 575 | |
296f96fc RR |
576 | err = register_netdev(dev); |
577 | if (err) { | |
578 | pr_debug("virtio_net: registering device failed\n"); | |
579 | goto free_send; | |
580 | } | |
b3369c1f RR |
581 | |
582 | /* Last of all, set up some receive buffers. */ | |
583 | try_fill_recv(vi); | |
584 | ||
585 | /* If we didn't even get one input buffer, we're useless. */ | |
586 | if (vi->num == 0) { | |
587 | err = -ENOMEM; | |
588 | goto unregister; | |
589 | } | |
590 | ||
296f96fc | 591 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
592 | return 0; |
593 | ||
b3369c1f RR |
594 | unregister: |
595 | unregister_netdev(dev); | |
296f96fc RR |
596 | free_send: |
597 | vdev->config->del_vq(vi->svq); | |
598 | free_recv: | |
599 | vdev->config->del_vq(vi->rvq); | |
600 | free: | |
601 | free_netdev(dev); | |
602 | return err; | |
603 | } | |
604 | ||
605 | static void virtnet_remove(struct virtio_device *vdev) | |
606 | { | |
74b2553f | 607 | struct virtnet_info *vi = vdev->priv; |
b3369c1f RR |
608 | struct sk_buff *skb; |
609 | ||
6e5aa7ef RR |
610 | /* Stop all the virtqueues. */ |
611 | vdev->config->reset(vdev); | |
612 | ||
363f1514 RR |
613 | if (!vi->free_in_tasklet) |
614 | del_timer_sync(&vi->xmit_free_timer); | |
14c998f0 | 615 | |
b3369c1f | 616 | /* Free our skbs in send and recv queues, if any. */ |
b3369c1f RR |
617 | while ((skb = __skb_dequeue(&vi->recv)) != NULL) { |
618 | kfree_skb(skb); | |
619 | vi->num--; | |
620 | } | |
288369cc | 621 | __skb_queue_purge(&vi->send); |
b3369c1f RR |
622 | |
623 | BUG_ON(vi->num != 0); | |
74b2553f RR |
624 | |
625 | vdev->config->del_vq(vi->svq); | |
626 | vdev->config->del_vq(vi->rvq); | |
627 | unregister_netdev(vi->dev); | |
fb6813f4 RR |
628 | |
629 | while (vi->pages) | |
630 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); | |
631 | ||
74b2553f | 632 | free_netdev(vi->dev); |
296f96fc RR |
633 | } |
634 | ||
635 | static struct virtio_device_id id_table[] = { | |
636 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
637 | { 0 }, | |
638 | }; | |
639 | ||
c45a6816 | 640 | static unsigned int features[] = { |
5e4fe5c4 MM |
641 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
642 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 643 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 HX |
644 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
645 | VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */ | |
646 | VIRTIO_F_NOTIFY_ON_EMPTY, | |
c45a6816 RR |
647 | }; |
648 | ||
296f96fc | 649 | static struct virtio_driver virtio_net = { |
c45a6816 RR |
650 | .feature_table = features, |
651 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
652 | .driver.name = KBUILD_MODNAME, |
653 | .driver.owner = THIS_MODULE, | |
654 | .id_table = id_table, | |
655 | .probe = virtnet_probe, | |
656 | .remove = __devexit_p(virtnet_remove), | |
657 | }; | |
658 | ||
659 | static int __init init(void) | |
660 | { | |
661 | return register_virtio_driver(&virtio_net); | |
662 | } | |
663 | ||
664 | static void __exit fini(void) | |
665 | { | |
666 | unregister_virtio_driver(&virtio_net); | |
667 | } | |
668 | module_init(init); | |
669 | module_exit(fini); | |
670 | ||
671 | MODULE_DEVICE_TABLE(virtio, id_table); | |
672 | MODULE_DESCRIPTION("Virtio network driver"); | |
673 | MODULE_LICENSE("GPL"); |