Commit | Line | Data |
---|---|---|
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 RR |
39 | |
40 | struct virtnet_info | |
41 | { | |
42 | struct virtio_device *vdev; | |
43 | struct virtqueue *rvq, *svq; | |
44 | struct net_device *dev; | |
45 | struct napi_struct napi; | |
46 | ||
99ffc696 RR |
47 | /* The skb we couldn't send because buffers were full. */ |
48 | struct sk_buff *last_xmit_skb; | |
49 | ||
363f1514 | 50 | /* If we need to free in a timer, this is it. */ |
14c998f0 MM |
51 | struct timer_list xmit_free_timer; |
52 | ||
296f96fc RR |
53 | /* Number of input buffers, and max we've ever had. */ |
54 | unsigned int num, max; | |
55 | ||
11a3a154 RR |
56 | /* For cleaning up after transmission. */ |
57 | struct tasklet_struct tasklet; | |
363f1514 | 58 | bool free_in_tasklet; |
11a3a154 | 59 | |
97402b96 HX |
60 | /* I like... big packets and I cannot lie! */ |
61 | bool big_packets; | |
62 | ||
3f2c31d9 MM |
63 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
64 | bool mergeable_rx_bufs; | |
65 | ||
296f96fc RR |
66 | /* Receive & send queues. */ |
67 | struct sk_buff_head recv; | |
68 | struct sk_buff_head send; | |
fb6813f4 RR |
69 | |
70 | /* Chain pages by the private ptr. */ | |
71 | struct page *pages; | |
296f96fc RR |
72 | }; |
73 | ||
3f2c31d9 | 74 | static inline void *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc RR |
75 | { |
76 | return (struct virtio_net_hdr *)skb->cb; | |
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 | { | |
3f2c31d9 | 124 | struct virtnet_info *vi = netdev_priv(dev); |
296f96fc | 125 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); |
97402b96 | 126 | int err; |
3f2c31d9 | 127 | int i; |
296f96fc RR |
128 | |
129 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { | |
130 | pr_debug("%s: short packet %i\n", dev->name, len); | |
131 | dev->stats.rx_length_errors++; | |
132 | goto drop; | |
133 | } | |
23cde76d | 134 | |
3f2c31d9 MM |
135 | if (vi->mergeable_rx_bufs) { |
136 | struct virtio_net_hdr_mrg_rxbuf *mhdr = skb_vnet_hdr(skb); | |
137 | unsigned int copy; | |
138 | char *p = page_address(skb_shinfo(skb)->frags[0].page); | |
fb6813f4 | 139 | |
3f2c31d9 MM |
140 | if (len > PAGE_SIZE) |
141 | len = PAGE_SIZE; | |
142 | len -= sizeof(struct virtio_net_hdr_mrg_rxbuf); | |
143 | ||
144 | memcpy(hdr, p, sizeof(*mhdr)); | |
145 | p += sizeof(*mhdr); | |
146 | ||
147 | copy = len; | |
148 | if (copy > skb_tailroom(skb)) | |
149 | copy = skb_tailroom(skb); | |
150 | ||
151 | memcpy(skb_put(skb, copy), p, copy); | |
152 | ||
153 | len -= copy; | |
154 | ||
155 | if (!len) { | |
156 | give_a_page(vi, skb_shinfo(skb)->frags[0].page); | |
157 | skb_shinfo(skb)->nr_frags--; | |
158 | } else { | |
159 | skb_shinfo(skb)->frags[0].page_offset += | |
160 | sizeof(*mhdr) + copy; | |
161 | skb_shinfo(skb)->frags[0].size = len; | |
162 | skb->data_len += len; | |
163 | skb->len += len; | |
164 | } | |
165 | ||
166 | while (--mhdr->num_buffers) { | |
167 | struct sk_buff *nskb; | |
168 | ||
169 | i = skb_shinfo(skb)->nr_frags; | |
170 | if (i >= MAX_SKB_FRAGS) { | |
171 | pr_debug("%s: packet too long %d\n", dev->name, | |
172 | len); | |
173 | dev->stats.rx_length_errors++; | |
174 | goto drop; | |
175 | } | |
176 | ||
177 | nskb = vi->rvq->vq_ops->get_buf(vi->rvq, &len); | |
178 | if (!nskb) { | |
179 | pr_debug("%s: rx error: %d buffers missing\n", | |
180 | dev->name, mhdr->num_buffers); | |
181 | dev->stats.rx_length_errors++; | |
182 | goto drop; | |
183 | } | |
184 | ||
185 | __skb_unlink(nskb, &vi->recv); | |
186 | vi->num--; | |
187 | ||
188 | skb_shinfo(skb)->frags[i] = skb_shinfo(nskb)->frags[0]; | |
189 | skb_shinfo(nskb)->nr_frags = 0; | |
190 | kfree_skb(nskb); | |
191 | ||
192 | if (len > PAGE_SIZE) | |
193 | len = PAGE_SIZE; | |
194 | ||
195 | skb_shinfo(skb)->frags[i].size = len; | |
196 | skb_shinfo(skb)->nr_frags++; | |
197 | skb->data_len += len; | |
198 | skb->len += len; | |
199 | } | |
200 | } else { | |
201 | len -= sizeof(struct virtio_net_hdr); | |
202 | ||
203 | if (len <= MAX_PACKET_LEN) | |
204 | trim_pages(vi, skb); | |
205 | ||
206 | err = pskb_trim(skb, len); | |
207 | if (err) { | |
208 | pr_debug("%s: pskb_trim failed %i %d\n", dev->name, | |
209 | len, err); | |
210 | dev->stats.rx_dropped++; | |
211 | goto drop; | |
212 | } | |
97402b96 | 213 | } |
3f2c31d9 | 214 | |
97402b96 | 215 | skb->truesize += skb->data_len; |
296f96fc RR |
216 | dev->stats.rx_bytes += skb->len; |
217 | dev->stats.rx_packets++; | |
218 | ||
219 | if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
220 | pr_debug("Needs csum!\n"); | |
f35d9d8a | 221 | if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset)) |
296f96fc | 222 | goto frame_err; |
296f96fc RR |
223 | } |
224 | ||
23cde76d MM |
225 | skb->protocol = eth_type_trans(skb, dev); |
226 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
227 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
228 | ||
296f96fc RR |
229 | if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
230 | pr_debug("GSO!\n"); | |
34a48579 | 231 | switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
232 | case VIRTIO_NET_HDR_GSO_TCPV4: |
233 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
234 | break; | |
296f96fc RR |
235 | case VIRTIO_NET_HDR_GSO_UDP: |
236 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
237 | break; | |
238 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
239 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
240 | break; | |
241 | default: | |
242 | if (net_ratelimit()) | |
243 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
244 | dev->name, hdr->gso_type); | |
245 | goto frame_err; | |
246 | } | |
247 | ||
34a48579 RR |
248 | if (hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) |
249 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
250 | ||
296f96fc RR |
251 | skb_shinfo(skb)->gso_size = hdr->gso_size; |
252 | if (skb_shinfo(skb)->gso_size == 0) { | |
253 | if (net_ratelimit()) | |
254 | printk(KERN_WARNING "%s: zero gso size.\n", | |
255 | dev->name); | |
256 | goto frame_err; | |
257 | } | |
258 | ||
259 | /* Header must be checked, and gso_segs computed. */ | |
260 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
261 | skb_shinfo(skb)->gso_segs = 0; | |
262 | } | |
263 | ||
264 | netif_receive_skb(skb); | |
265 | return; | |
266 | ||
267 | frame_err: | |
268 | dev->stats.rx_frame_errors++; | |
269 | drop: | |
270 | dev_kfree_skb(skb); | |
271 | } | |
272 | ||
3f2c31d9 | 273 | static void try_fill_recv_maxbufs(struct virtnet_info *vi) |
296f96fc RR |
274 | { |
275 | struct sk_buff *skb; | |
05271685 | 276 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
97402b96 | 277 | int num, err, i; |
296f96fc | 278 | |
05271685 | 279 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
296f96fc | 280 | for (;;) { |
3f2c31d9 MM |
281 | struct virtio_net_hdr *hdr; |
282 | ||
296f96fc RR |
283 | skb = netdev_alloc_skb(vi->dev, MAX_PACKET_LEN); |
284 | if (unlikely(!skb)) | |
285 | break; | |
286 | ||
287 | skb_put(skb, MAX_PACKET_LEN); | |
3f2c31d9 MM |
288 | |
289 | hdr = skb_vnet_hdr(skb); | |
8527bec5 | 290 | sg_set_buf(sg, hdr, sizeof(*hdr)); |
97402b96 HX |
291 | |
292 | if (vi->big_packets) { | |
293 | for (i = 0; i < MAX_SKB_FRAGS; i++) { | |
294 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; | |
fb6813f4 | 295 | f->page = get_a_page(vi, GFP_ATOMIC); |
97402b96 HX |
296 | if (!f->page) |
297 | break; | |
298 | ||
299 | f->page_offset = 0; | |
300 | f->size = PAGE_SIZE; | |
301 | ||
302 | skb->data_len += PAGE_SIZE; | |
303 | skb->len += PAGE_SIZE; | |
304 | ||
305 | skb_shinfo(skb)->nr_frags++; | |
306 | } | |
307 | } | |
308 | ||
296f96fc RR |
309 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
310 | skb_queue_head(&vi->recv, skb); | |
311 | ||
312 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, num, skb); | |
313 | if (err) { | |
314 | skb_unlink(skb, &vi->recv); | |
0a888fd1 | 315 | trim_pages(vi, skb); |
296f96fc RR |
316 | kfree_skb(skb); |
317 | break; | |
318 | } | |
319 | vi->num++; | |
320 | } | |
321 | if (unlikely(vi->num > vi->max)) | |
322 | vi->max = vi->num; | |
323 | vi->rvq->vq_ops->kick(vi->rvq); | |
324 | } | |
325 | ||
3f2c31d9 MM |
326 | static void try_fill_recv(struct virtnet_info *vi) |
327 | { | |
328 | struct sk_buff *skb; | |
329 | struct scatterlist sg[1]; | |
330 | int err; | |
331 | ||
332 | if (!vi->mergeable_rx_bufs) { | |
333 | try_fill_recv_maxbufs(vi); | |
334 | return; | |
335 | } | |
336 | ||
337 | for (;;) { | |
338 | skb_frag_t *f; | |
339 | ||
340 | skb = netdev_alloc_skb(vi->dev, GOOD_COPY_LEN + NET_IP_ALIGN); | |
341 | if (unlikely(!skb)) | |
342 | break; | |
343 | ||
344 | skb_reserve(skb, NET_IP_ALIGN); | |
345 | ||
346 | f = &skb_shinfo(skb)->frags[0]; | |
347 | f->page = get_a_page(vi, GFP_ATOMIC); | |
348 | if (!f->page) { | |
349 | kfree_skb(skb); | |
350 | break; | |
351 | } | |
352 | ||
353 | f->page_offset = 0; | |
354 | f->size = PAGE_SIZE; | |
355 | ||
356 | skb_shinfo(skb)->nr_frags++; | |
357 | ||
358 | sg_init_one(sg, page_address(f->page), PAGE_SIZE); | |
359 | skb_queue_head(&vi->recv, skb); | |
360 | ||
361 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 1, skb); | |
362 | if (err) { | |
363 | skb_unlink(skb, &vi->recv); | |
364 | kfree_skb(skb); | |
365 | break; | |
366 | } | |
367 | vi->num++; | |
368 | } | |
369 | if (unlikely(vi->num > vi->max)) | |
370 | vi->max = vi->num; | |
371 | vi->rvq->vq_ops->kick(vi->rvq); | |
372 | } | |
373 | ||
18445c4d | 374 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
375 | { |
376 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d | 377 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
908a7a16 | 378 | if (netif_rx_schedule_prep(&vi->napi)) { |
18445c4d | 379 | rvq->vq_ops->disable_cb(rvq); |
908a7a16 | 380 | __netif_rx_schedule(&vi->napi); |
18445c4d | 381 | } |
296f96fc RR |
382 | } |
383 | ||
384 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
385 | { | |
386 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
387 | struct sk_buff *skb = NULL; | |
388 | unsigned int len, received = 0; | |
389 | ||
390 | again: | |
391 | while (received < budget && | |
392 | (skb = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { | |
393 | __skb_unlink(skb, &vi->recv); | |
394 | receive_skb(vi->dev, skb, len); | |
395 | vi->num--; | |
396 | received++; | |
397 | } | |
398 | ||
399 | /* FIXME: If we oom and completely run out of inbufs, we need | |
400 | * to start a timer trying to fill more. */ | |
401 | if (vi->num < vi->max / 2) | |
402 | try_fill_recv(vi); | |
403 | ||
8329d98e RR |
404 | /* Out of packets? */ |
405 | if (received < budget) { | |
908a7a16 | 406 | netif_rx_complete(napi); |
18445c4d | 407 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) |
4265f161 CB |
408 | && napi_schedule_prep(napi)) { |
409 | vi->rvq->vq_ops->disable_cb(vi->rvq); | |
908a7a16 | 410 | __netif_rx_schedule(napi); |
296f96fc | 411 | goto again; |
4265f161 | 412 | } |
296f96fc RR |
413 | } |
414 | ||
415 | return received; | |
416 | } | |
417 | ||
418 | static void free_old_xmit_skbs(struct virtnet_info *vi) | |
419 | { | |
420 | struct sk_buff *skb; | |
421 | unsigned int len; | |
422 | ||
423 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { | |
424 | pr_debug("Sent skb %p\n", skb); | |
425 | __skb_unlink(skb, &vi->send); | |
655aa31f | 426 | vi->dev->stats.tx_bytes += skb->len; |
296f96fc RR |
427 | vi->dev->stats.tx_packets++; |
428 | kfree_skb(skb); | |
429 | } | |
430 | } | |
431 | ||
363f1514 RR |
432 | /* If the virtio transport doesn't always notify us when all in-flight packets |
433 | * are consumed, we fall back to using this function on a timer to free them. */ | |
14c998f0 MM |
434 | static void xmit_free(unsigned long data) |
435 | { | |
436 | struct virtnet_info *vi = (void *)data; | |
437 | ||
438 | netif_tx_lock(vi->dev); | |
439 | ||
440 | free_old_xmit_skbs(vi); | |
441 | ||
442 | if (!skb_queue_empty(&vi->send)) | |
443 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); | |
444 | ||
445 | netif_tx_unlock(vi->dev); | |
446 | } | |
447 | ||
99ffc696 | 448 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 449 | { |
14c998f0 | 450 | int num, err; |
05271685 | 451 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
3f2c31d9 MM |
452 | struct virtio_net_hdr_mrg_rxbuf *mhdr = skb_vnet_hdr(skb); |
453 | struct virtio_net_hdr *hdr = skb_vnet_hdr(skb); | |
296f96fc | 454 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
296f96fc | 455 | |
05271685 | 456 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
4d125de3 | 457 | |
e174961c | 458 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 459 | |
296f96fc RR |
460 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
461 | hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
462 | hdr->csum_start = skb->csum_start - skb_headroom(skb); | |
463 | hdr->csum_offset = skb->csum_offset; | |
464 | } else { | |
465 | hdr->flags = 0; | |
466 | hdr->csum_offset = hdr->csum_start = 0; | |
467 | } | |
468 | ||
469 | if (skb_is_gso(skb)) { | |
50c8ea80 | 470 | hdr->hdr_len = skb_transport_header(skb) - skb->data; |
296f96fc | 471 | hdr->gso_size = skb_shinfo(skb)->gso_size; |
34a48579 | 472 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
296f96fc RR |
473 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
474 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) | |
475 | hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
476 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) | |
477 | hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
478 | else | |
479 | BUG(); | |
34a48579 RR |
480 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
481 | hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
296f96fc RR |
482 | } else { |
483 | hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
50c8ea80 | 484 | hdr->gso_size = hdr->hdr_len = 0; |
296f96fc RR |
485 | } |
486 | ||
3f2c31d9 MM |
487 | mhdr->num_buffers = 0; |
488 | ||
489 | /* Encode metadata header at front. */ | |
490 | if (vi->mergeable_rx_bufs) | |
8527bec5 | 491 | sg_set_buf(sg, mhdr, sizeof(*mhdr)); |
3f2c31d9 | 492 | else |
8527bec5 | 493 | sg_set_buf(sg, hdr, sizeof(*hdr)); |
3f2c31d9 | 494 | |
296f96fc | 495 | num = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
99ffc696 | 496 | |
14c998f0 | 497 | err = vi->svq->vq_ops->add_buf(vi->svq, sg, num, 0, skb); |
363f1514 | 498 | if (!err && !vi->free_in_tasklet) |
14c998f0 MM |
499 | mod_timer(&vi->xmit_free_timer, jiffies + (HZ/10)); |
500 | ||
501 | return err; | |
99ffc696 RR |
502 | } |
503 | ||
11a3a154 RR |
504 | static void xmit_tasklet(unsigned long data) |
505 | { | |
506 | struct virtnet_info *vi = (void *)data; | |
507 | ||
508 | netif_tx_lock_bh(vi->dev); | |
509 | if (vi->last_xmit_skb && xmit_skb(vi, vi->last_xmit_skb) == 0) { | |
510 | vi->svq->vq_ops->kick(vi->svq); | |
511 | vi->last_xmit_skb = NULL; | |
512 | } | |
363f1514 RR |
513 | if (vi->free_in_tasklet) |
514 | free_old_xmit_skbs(vi); | |
11a3a154 RR |
515 | netif_tx_unlock_bh(vi->dev); |
516 | } | |
517 | ||
99ffc696 RR |
518 | static int start_xmit(struct sk_buff *skb, struct net_device *dev) |
519 | { | |
520 | struct virtnet_info *vi = netdev_priv(dev); | |
2cb9c6ba RR |
521 | |
522 | again: | |
523 | /* Free up any pending old buffers before queueing new ones. */ | |
524 | free_old_xmit_skbs(vi); | |
99ffc696 RR |
525 | |
526 | /* If we has a buffer left over from last time, send it now. */ | |
9953ca6c MM |
527 | if (unlikely(vi->last_xmit_skb) && |
528 | xmit_skb(vi, vi->last_xmit_skb) != 0) | |
529 | goto stop_queue; | |
530 | ||
531 | vi->last_xmit_skb = NULL; | |
2cb9c6ba | 532 | |
99ffc696 | 533 | /* Put new one in send queue and do transmit */ |
7eb2e251 RR |
534 | if (likely(skb)) { |
535 | __skb_queue_head(&vi->send, skb); | |
536 | if (xmit_skb(vi, skb) != 0) { | |
537 | vi->last_xmit_skb = skb; | |
538 | skb = NULL; | |
539 | goto stop_queue; | |
540 | } | |
296f96fc | 541 | } |
99ffc696 | 542 | done: |
296f96fc | 543 | vi->svq->vq_ops->kick(vi->svq); |
99ffc696 RR |
544 | return NETDEV_TX_OK; |
545 | ||
546 | stop_queue: | |
547 | pr_debug("%s: virtio not prepared to send\n", dev->name); | |
548 | netif_stop_queue(dev); | |
549 | ||
550 | /* Activate callback for using skbs: if this returns false it | |
551 | * means some were used in the meantime. */ | |
552 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
553 | vi->svq->vq_ops->disable_cb(vi->svq); | |
554 | netif_start_queue(dev); | |
555 | goto again; | |
556 | } | |
9953ca6c MM |
557 | if (skb) { |
558 | /* Drop this skb: we only queue one. */ | |
559 | vi->dev->stats.tx_dropped++; | |
560 | kfree_skb(skb); | |
561 | } | |
99ffc696 | 562 | goto done; |
296f96fc RR |
563 | } |
564 | ||
da74e89d AS |
565 | #ifdef CONFIG_NET_POLL_CONTROLLER |
566 | static void virtnet_netpoll(struct net_device *dev) | |
567 | { | |
568 | struct virtnet_info *vi = netdev_priv(dev); | |
569 | ||
570 | napi_schedule(&vi->napi); | |
571 | } | |
572 | #endif | |
573 | ||
296f96fc RR |
574 | static int virtnet_open(struct net_device *dev) |
575 | { | |
576 | struct virtnet_info *vi = netdev_priv(dev); | |
577 | ||
296f96fc | 578 | napi_enable(&vi->napi); |
a48bd8f6 RR |
579 | |
580 | /* If all buffers were filled by other side before we napi_enabled, we | |
581 | * won't get another interrupt, so process any outstanding packets | |
370076d9 CB |
582 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
583 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
908a7a16 | 584 | if (netif_rx_schedule_prep(&vi->napi)) { |
370076d9 | 585 | vi->rvq->vq_ops->disable_cb(vi->rvq); |
908a7a16 | 586 | __netif_rx_schedule(&vi->napi); |
370076d9 | 587 | } |
296f96fc RR |
588 | return 0; |
589 | } | |
590 | ||
591 | static int virtnet_close(struct net_device *dev) | |
592 | { | |
593 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc RR |
594 | |
595 | napi_disable(&vi->napi); | |
596 | ||
296f96fc RR |
597 | return 0; |
598 | } | |
599 | ||
a9ea3fc6 HX |
600 | static int virtnet_set_tx_csum(struct net_device *dev, u32 data) |
601 | { | |
602 | struct virtnet_info *vi = netdev_priv(dev); | |
603 | struct virtio_device *vdev = vi->vdev; | |
604 | ||
605 | if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) | |
606 | return -ENOSYS; | |
607 | ||
608 | return ethtool_op_set_tx_hw_csum(dev, data); | |
609 | } | |
610 | ||
611 | static struct ethtool_ops virtnet_ethtool_ops = { | |
612 | .set_tx_csum = virtnet_set_tx_csum, | |
613 | .set_sg = ethtool_op_set_sg, | |
0276b497 | 614 | .set_tso = ethtool_op_set_tso, |
4783256e | 615 | .get_link = ethtool_op_get_link, |
a9ea3fc6 HX |
616 | }; |
617 | ||
39da5814 MM |
618 | #define MIN_MTU 68 |
619 | #define MAX_MTU 65535 | |
620 | ||
621 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
622 | { | |
623 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
624 | return -EINVAL; | |
625 | dev->mtu = new_mtu; | |
626 | return 0; | |
627 | } | |
628 | ||
76288b4e SH |
629 | static const struct net_device_ops virtnet_netdev = { |
630 | .ndo_open = virtnet_open, | |
631 | .ndo_stop = virtnet_close, | |
632 | .ndo_start_xmit = start_xmit, | |
633 | .ndo_validate_addr = eth_validate_addr, | |
634 | .ndo_set_mac_address = eth_mac_addr, | |
635 | .ndo_change_mtu = virtnet_change_mtu, | |
636 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
637 | .ndo_poll_controller = virtnet_netpoll, | |
638 | #endif | |
639 | }; | |
640 | ||
296f96fc RR |
641 | static int virtnet_probe(struct virtio_device *vdev) |
642 | { | |
643 | int err; | |
296f96fc RR |
644 | struct net_device *dev; |
645 | struct virtnet_info *vi; | |
296f96fc RR |
646 | |
647 | /* Allocate ourselves a network device with room for our info */ | |
648 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
649 | if (!dev) | |
650 | return -ENOMEM; | |
651 | ||
652 | /* Set up network device as normal. */ | |
76288b4e | 653 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 654 | dev->features = NETIF_F_HIGHDMA; |
a9ea3fc6 | 655 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
656 | SET_NETDEV_DEV(dev, &vdev->dev); |
657 | ||
658 | /* Do we support "hardware" checksums? */ | |
c45a6816 | 659 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc RR |
660 | /* This opens up the world of extra features. */ |
661 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
c45a6816 | 662 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
34a48579 RR |
663 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
664 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; | |
665 | } | |
5539ae96 | 666 | /* Individual feature bits: what can host handle? */ |
c45a6816 | 667 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
5539ae96 | 668 | dev->features |= NETIF_F_TSO; |
c45a6816 | 669 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
5539ae96 | 670 | dev->features |= NETIF_F_TSO6; |
c45a6816 | 671 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
5539ae96 | 672 | dev->features |= NETIF_F_TSO_ECN; |
c45a6816 | 673 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
5539ae96 | 674 | dev->features |= NETIF_F_UFO; |
296f96fc RR |
675 | } |
676 | ||
677 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
c45a6816 | 678 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
a586d4f6 RR |
679 | vdev->config->get(vdev, |
680 | offsetof(struct virtio_net_config, mac), | |
681 | dev->dev_addr, dev->addr_len); | |
296f96fc RR |
682 | } else |
683 | random_ether_addr(dev->dev_addr); | |
684 | ||
685 | /* Set up our device-specific information */ | |
686 | vi = netdev_priv(dev); | |
6c0cd7c0 | 687 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
688 | vi->dev = dev; |
689 | vi->vdev = vdev; | |
d9d5dcc8 | 690 | vdev->priv = vi; |
fb6813f4 | 691 | vi->pages = NULL; |
296f96fc | 692 | |
363f1514 RR |
693 | /* If they give us a callback when all buffers are done, we don't need |
694 | * the timer. */ | |
695 | vi->free_in_tasklet = virtio_has_feature(vdev,VIRTIO_F_NOTIFY_ON_EMPTY); | |
696 | ||
97402b96 HX |
697 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
698 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) | |
699 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) | |
700 | || virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
701 | vi->big_packets = true; | |
702 | ||
3f2c31d9 MM |
703 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
704 | vi->mergeable_rx_bufs = true; | |
705 | ||
296f96fc | 706 | /* We expect two virtqueues, receive then send. */ |
a586d4f6 | 707 | vi->rvq = vdev->config->find_vq(vdev, 0, skb_recv_done); |
296f96fc RR |
708 | if (IS_ERR(vi->rvq)) { |
709 | err = PTR_ERR(vi->rvq); | |
710 | goto free; | |
711 | } | |
712 | ||
a586d4f6 | 713 | vi->svq = vdev->config->find_vq(vdev, 1, skb_xmit_done); |
296f96fc RR |
714 | if (IS_ERR(vi->svq)) { |
715 | err = PTR_ERR(vi->svq); | |
716 | goto free_recv; | |
717 | } | |
718 | ||
719 | /* Initialize our empty receive and send queues. */ | |
720 | skb_queue_head_init(&vi->recv); | |
721 | skb_queue_head_init(&vi->send); | |
722 | ||
11a3a154 RR |
723 | tasklet_init(&vi->tasklet, xmit_tasklet, (unsigned long)vi); |
724 | ||
363f1514 RR |
725 | if (!vi->free_in_tasklet) |
726 | setup_timer(&vi->xmit_free_timer, xmit_free, (unsigned long)vi); | |
14c998f0 | 727 | |
296f96fc RR |
728 | err = register_netdev(dev); |
729 | if (err) { | |
730 | pr_debug("virtio_net: registering device failed\n"); | |
731 | goto free_send; | |
732 | } | |
b3369c1f RR |
733 | |
734 | /* Last of all, set up some receive buffers. */ | |
735 | try_fill_recv(vi); | |
736 | ||
737 | /* If we didn't even get one input buffer, we're useless. */ | |
738 | if (vi->num == 0) { | |
739 | err = -ENOMEM; | |
740 | goto unregister; | |
741 | } | |
742 | ||
4783256e PK |
743 | netif_carrier_on(dev); |
744 | ||
296f96fc | 745 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
746 | return 0; |
747 | ||
b3369c1f RR |
748 | unregister: |
749 | unregister_netdev(dev); | |
296f96fc RR |
750 | free_send: |
751 | vdev->config->del_vq(vi->svq); | |
752 | free_recv: | |
753 | vdev->config->del_vq(vi->rvq); | |
754 | free: | |
755 | free_netdev(dev); | |
756 | return err; | |
757 | } | |
758 | ||
759 | static void virtnet_remove(struct virtio_device *vdev) | |
760 | { | |
74b2553f | 761 | struct virtnet_info *vi = vdev->priv; |
b3369c1f RR |
762 | struct sk_buff *skb; |
763 | ||
6e5aa7ef RR |
764 | /* Stop all the virtqueues. */ |
765 | vdev->config->reset(vdev); | |
766 | ||
363f1514 RR |
767 | if (!vi->free_in_tasklet) |
768 | del_timer_sync(&vi->xmit_free_timer); | |
14c998f0 | 769 | |
b3369c1f | 770 | /* Free our skbs in send and recv queues, if any. */ |
b3369c1f RR |
771 | while ((skb = __skb_dequeue(&vi->recv)) != NULL) { |
772 | kfree_skb(skb); | |
773 | vi->num--; | |
774 | } | |
288369cc | 775 | __skb_queue_purge(&vi->send); |
b3369c1f RR |
776 | |
777 | BUG_ON(vi->num != 0); | |
74b2553f RR |
778 | |
779 | vdev->config->del_vq(vi->svq); | |
780 | vdev->config->del_vq(vi->rvq); | |
781 | unregister_netdev(vi->dev); | |
fb6813f4 RR |
782 | |
783 | while (vi->pages) | |
784 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); | |
785 | ||
74b2553f | 786 | free_netdev(vi->dev); |
296f96fc RR |
787 | } |
788 | ||
789 | static struct virtio_device_id id_table[] = { | |
790 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
791 | { 0 }, | |
792 | }; | |
793 | ||
c45a6816 | 794 | static unsigned int features[] = { |
5e4fe5c4 MM |
795 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
796 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 797 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 HX |
798 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
799 | VIRTIO_NET_F_GUEST_ECN, /* We don't yet handle UFO input. */ | |
3f2c31d9 | 800 | VIRTIO_NET_F_MRG_RXBUF, |
97402b96 | 801 | VIRTIO_F_NOTIFY_ON_EMPTY, |
c45a6816 RR |
802 | }; |
803 | ||
296f96fc | 804 | static struct virtio_driver virtio_net = { |
c45a6816 RR |
805 | .feature_table = features, |
806 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
807 | .driver.name = KBUILD_MODNAME, |
808 | .driver.owner = THIS_MODULE, | |
809 | .id_table = id_table, | |
810 | .probe = virtnet_probe, | |
811 | .remove = __devexit_p(virtnet_remove), | |
812 | }; | |
813 | ||
814 | static int __init init(void) | |
815 | { | |
816 | return register_virtio_driver(&virtio_net); | |
817 | } | |
818 | ||
819 | static void __exit fini(void) | |
820 | { | |
821 | unregister_virtio_driver(&virtio_net); | |
822 | } | |
823 | module_init(init); | |
824 | module_exit(fini); | |
825 | ||
826 | MODULE_DEVICE_TABLE(virtio, id_table); | |
827 | MODULE_DESCRIPTION("Virtio network driver"); | |
828 | MODULE_LICENSE("GPL"); |