]>
Commit | Line | Data |
---|---|---|
48925e37 | 1 | /* A network driver using virtio. |
296f96fc RR |
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 | 39 | |
f565a7c2 | 40 | #define VIRTNET_SEND_COMMAND_SG_MAX 2 |
2a41f71d | 41 | |
296f96fc RR |
42 | struct virtnet_info |
43 | { | |
44 | struct virtio_device *vdev; | |
2a41f71d | 45 | struct virtqueue *rvq, *svq, *cvq; |
296f96fc RR |
46 | struct net_device *dev; |
47 | struct napi_struct napi; | |
9f4d26d0 | 48 | unsigned int status; |
296f96fc RR |
49 | |
50 | /* Number of input buffers, and max we've ever had. */ | |
51 | unsigned int num, max; | |
52 | ||
97402b96 HX |
53 | /* I like... big packets and I cannot lie! */ |
54 | bool big_packets; | |
55 | ||
3f2c31d9 MM |
56 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
57 | bool mergeable_rx_bufs; | |
58 | ||
9ab86bbc | 59 | /* Send queue. */ |
296f96fc | 60 | struct sk_buff_head send; |
fb6813f4 | 61 | |
3161e453 RR |
62 | /* Work struct for refilling if we run low on memory. */ |
63 | struct delayed_work refill; | |
64 | ||
fb6813f4 RR |
65 | /* Chain pages by the private ptr. */ |
66 | struct page *pages; | |
296f96fc RR |
67 | }; |
68 | ||
b3f24698 RR |
69 | struct skb_vnet_hdr { |
70 | union { | |
71 | struct virtio_net_hdr hdr; | |
72 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
73 | }; | |
48925e37 | 74 | unsigned int num_sg; |
b3f24698 RR |
75 | }; |
76 | ||
9ab86bbc SM |
77 | struct padded_vnet_hdr { |
78 | struct virtio_net_hdr hdr; | |
79 | /* | |
80 | * virtio_net_hdr should be in a separated sg buffer because of a | |
81 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
82 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
83 | */ | |
84 | char padding[6]; | |
85 | }; | |
86 | ||
b3f24698 | 87 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 88 | { |
b3f24698 | 89 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
90 | } |
91 | ||
9ab86bbc SM |
92 | /* |
93 | * private is used to chain pages for big packets, put the whole | |
94 | * most recent used list in the beginning for reuse | |
95 | */ | |
96 | static void give_pages(struct virtnet_info *vi, struct page *page) | |
0a888fd1 | 97 | { |
9ab86bbc | 98 | struct page *end; |
0a888fd1 | 99 | |
9ab86bbc SM |
100 | /* Find end of list, sew whole thing into vi->pages. */ |
101 | for (end = page; end->private; end = (struct page *)end->private); | |
102 | end->private = (unsigned long)vi->pages; | |
103 | vi->pages = page; | |
0a888fd1 MM |
104 | } |
105 | ||
fb6813f4 RR |
106 | static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) |
107 | { | |
108 | struct page *p = vi->pages; | |
109 | ||
9ab86bbc | 110 | if (p) { |
fb6813f4 | 111 | vi->pages = (struct page *)p->private; |
9ab86bbc SM |
112 | /* clear private here, it is used to chain pages */ |
113 | p->private = 0; | |
114 | } else | |
fb6813f4 RR |
115 | p = alloc_page(gfp_mask); |
116 | return p; | |
117 | } | |
118 | ||
2cb9c6ba | 119 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 120 | { |
2cb9c6ba | 121 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 122 | |
2cb9c6ba RR |
123 | /* Suppress further interrupts. */ |
124 | svq->vq_ops->disable_cb(svq); | |
11a3a154 | 125 | |
363f1514 | 126 | /* We were probably waiting for more output buffers. */ |
296f96fc | 127 | netif_wake_queue(vi->dev); |
296f96fc RR |
128 | } |
129 | ||
9ab86bbc SM |
130 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
131 | unsigned int offset, unsigned int *len) | |
296f96fc | 132 | { |
9ab86bbc SM |
133 | int i = skb_shinfo(skb)->nr_frags; |
134 | skb_frag_t *f; | |
135 | ||
136 | f = &skb_shinfo(skb)->frags[i]; | |
137 | f->size = min((unsigned)PAGE_SIZE - offset, *len); | |
138 | f->page_offset = offset; | |
139 | f->page = page; | |
140 | ||
141 | skb->data_len += f->size; | |
142 | skb->len += f->size; | |
143 | skb_shinfo(skb)->nr_frags++; | |
144 | *len -= f->size; | |
145 | } | |
23cde76d | 146 | |
9ab86bbc SM |
147 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
148 | struct page *page, unsigned int len) | |
149 | { | |
150 | struct sk_buff *skb; | |
151 | struct skb_vnet_hdr *hdr; | |
152 | unsigned int copy, hdr_len, offset; | |
153 | char *p; | |
fb6813f4 | 154 | |
9ab86bbc | 155 | p = page_address(page); |
3f2c31d9 | 156 | |
9ab86bbc SM |
157 | /* copy small packet so we can reuse these pages for small data */ |
158 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
159 | if (unlikely(!skb)) | |
160 | return NULL; | |
3f2c31d9 | 161 | |
9ab86bbc | 162 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 163 | |
9ab86bbc SM |
164 | if (vi->mergeable_rx_bufs) { |
165 | hdr_len = sizeof hdr->mhdr; | |
166 | offset = hdr_len; | |
167 | } else { | |
168 | hdr_len = sizeof hdr->hdr; | |
169 | offset = sizeof(struct padded_vnet_hdr); | |
170 | } | |
3f2c31d9 | 171 | |
9ab86bbc | 172 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 173 | |
9ab86bbc SM |
174 | len -= hdr_len; |
175 | p += offset; | |
3f2c31d9 | 176 | |
9ab86bbc SM |
177 | copy = len; |
178 | if (copy > skb_tailroom(skb)) | |
179 | copy = skb_tailroom(skb); | |
180 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 181 | |
9ab86bbc SM |
182 | len -= copy; |
183 | offset += copy; | |
3f2c31d9 | 184 | |
9ab86bbc SM |
185 | while (len) { |
186 | set_skb_frag(skb, page, offset, &len); | |
187 | page = (struct page *)page->private; | |
188 | offset = 0; | |
189 | } | |
3f2c31d9 | 190 | |
9ab86bbc SM |
191 | if (page) |
192 | give_pages(vi, page); | |
3f2c31d9 | 193 | |
9ab86bbc SM |
194 | return skb; |
195 | } | |
3f2c31d9 | 196 | |
9ab86bbc SM |
197 | static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb) |
198 | { | |
199 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); | |
200 | struct page *page; | |
201 | int num_buf, i, len; | |
202 | ||
203 | num_buf = hdr->mhdr.num_buffers; | |
204 | while (--num_buf) { | |
205 | i = skb_shinfo(skb)->nr_frags; | |
206 | if (i >= MAX_SKB_FRAGS) { | |
207 | pr_debug("%s: packet too long\n", skb->dev->name); | |
208 | skb->dev->stats.rx_length_errors++; | |
209 | return -EINVAL; | |
210 | } | |
3f2c31d9 | 211 | |
9ab86bbc SM |
212 | page = vi->rvq->vq_ops->get_buf(vi->rvq, &len); |
213 | if (!page) { | |
214 | pr_debug("%s: rx error: %d buffers missing\n", | |
215 | skb->dev->name, hdr->mhdr.num_buffers); | |
216 | skb->dev->stats.rx_length_errors++; | |
217 | return -EINVAL; | |
3f2c31d9 | 218 | } |
9ab86bbc SM |
219 | if (len > PAGE_SIZE) |
220 | len = PAGE_SIZE; | |
221 | ||
222 | set_skb_frag(skb, page, 0, &len); | |
223 | ||
224 | --vi->num; | |
225 | } | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static void receive_buf(struct net_device *dev, void *buf, unsigned int len) | |
230 | { | |
231 | struct virtnet_info *vi = netdev_priv(dev); | |
232 | struct sk_buff *skb; | |
233 | struct page *page; | |
234 | struct skb_vnet_hdr *hdr; | |
3f2c31d9 | 235 | |
9ab86bbc SM |
236 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
237 | pr_debug("%s: short packet %i\n", dev->name, len); | |
238 | dev->stats.rx_length_errors++; | |
239 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
240 | give_pages(vi, buf); | |
241 | else | |
242 | dev_kfree_skb(buf); | |
243 | return; | |
244 | } | |
3f2c31d9 | 245 | |
9ab86bbc SM |
246 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
247 | skb = buf; | |
248 | len -= sizeof(struct virtio_net_hdr); | |
249 | skb_trim(skb, len); | |
250 | } else { | |
251 | page = buf; | |
252 | skb = page_to_skb(vi, page, len); | |
253 | if (unlikely(!skb)) { | |
3f2c31d9 | 254 | dev->stats.rx_dropped++; |
9ab86bbc SM |
255 | give_pages(vi, page); |
256 | return; | |
3f2c31d9 | 257 | } |
9ab86bbc SM |
258 | if (vi->mergeable_rx_bufs) |
259 | if (receive_mergeable(vi, skb)) { | |
260 | dev_kfree_skb(skb); | |
261 | return; | |
262 | } | |
97402b96 | 263 | } |
3f2c31d9 | 264 | |
9ab86bbc | 265 | hdr = skb_vnet_hdr(skb); |
97402b96 | 266 | skb->truesize += skb->data_len; |
296f96fc RR |
267 | dev->stats.rx_bytes += skb->len; |
268 | dev->stats.rx_packets++; | |
269 | ||
b3f24698 | 270 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 271 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
272 | if (!skb_partial_csum_set(skb, |
273 | hdr->hdr.csum_start, | |
274 | hdr->hdr.csum_offset)) | |
296f96fc | 275 | goto frame_err; |
296f96fc RR |
276 | } |
277 | ||
23cde76d MM |
278 | skb->protocol = eth_type_trans(skb, dev); |
279 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
280 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
281 | ||
b3f24698 | 282 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 283 | pr_debug("GSO!\n"); |
b3f24698 | 284 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
285 | case VIRTIO_NET_HDR_GSO_TCPV4: |
286 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
287 | break; | |
296f96fc RR |
288 | case VIRTIO_NET_HDR_GSO_UDP: |
289 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
290 | break; | |
291 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
292 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
293 | break; | |
294 | default: | |
295 | if (net_ratelimit()) | |
296 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
b3f24698 | 297 | dev->name, hdr->hdr.gso_type); |
296f96fc RR |
298 | goto frame_err; |
299 | } | |
300 | ||
b3f24698 | 301 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
34a48579 RR |
302 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
303 | ||
b3f24698 | 304 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc RR |
305 | if (skb_shinfo(skb)->gso_size == 0) { |
306 | if (net_ratelimit()) | |
307 | printk(KERN_WARNING "%s: zero gso size.\n", | |
308 | dev->name); | |
309 | goto frame_err; | |
310 | } | |
311 | ||
312 | /* Header must be checked, and gso_segs computed. */ | |
313 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
314 | skb_shinfo(skb)->gso_segs = 0; | |
315 | } | |
316 | ||
317 | netif_receive_skb(skb); | |
318 | return; | |
319 | ||
320 | frame_err: | |
321 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
322 | dev_kfree_skb(skb); |
323 | } | |
324 | ||
9ab86bbc | 325 | static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp) |
296f96fc RR |
326 | { |
327 | struct sk_buff *skb; | |
9ab86bbc SM |
328 | struct skb_vnet_hdr *hdr; |
329 | struct scatterlist sg[2]; | |
330 | int err; | |
3f2c31d9 | 331 | |
9ab86bbc SM |
332 | skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN); |
333 | if (unlikely(!skb)) | |
334 | return -ENOMEM; | |
296f96fc | 335 | |
9ab86bbc | 336 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 337 | |
9ab86bbc SM |
338 | hdr = skb_vnet_hdr(skb); |
339 | sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr); | |
97402b96 | 340 | |
9ab86bbc | 341 | skb_to_sgvec(skb, sg + 1, 0, skb->len); |
97402b96 | 342 | |
9ab86bbc SM |
343 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, 2, skb); |
344 | if (err < 0) | |
345 | dev_kfree_skb(skb); | |
97402b96 | 346 | |
9ab86bbc SM |
347 | return err; |
348 | } | |
97402b96 | 349 | |
9ab86bbc SM |
350 | static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp) |
351 | { | |
352 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
353 | struct page *first, *list = NULL; | |
354 | char *p; | |
355 | int i, err, offset; | |
356 | ||
357 | /* page in sg[MAX_SKB_FRAGS + 1] is list tail */ | |
358 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { | |
359 | first = get_a_page(vi, gfp); | |
360 | if (!first) { | |
361 | if (list) | |
362 | give_pages(vi, list); | |
363 | return -ENOMEM; | |
97402b96 | 364 | } |
9ab86bbc | 365 | sg_set_buf(&sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 366 | |
9ab86bbc SM |
367 | /* chain new page in list head to match sg */ |
368 | first->private = (unsigned long)list; | |
369 | list = first; | |
370 | } | |
296f96fc | 371 | |
9ab86bbc SM |
372 | first = get_a_page(vi, gfp); |
373 | if (!first) { | |
374 | give_pages(vi, list); | |
375 | return -ENOMEM; | |
376 | } | |
377 | p = page_address(first); | |
378 | ||
379 | /* sg[0], sg[1] share the same page */ | |
380 | /* a separated sg[0] for virtio_net_hdr only during to QEMU bug*/ | |
381 | sg_set_buf(&sg[0], p, sizeof(struct virtio_net_hdr)); | |
382 | ||
383 | /* sg[1] for data packet, from offset */ | |
384 | offset = sizeof(struct padded_vnet_hdr); | |
385 | sg_set_buf(&sg[1], p + offset, PAGE_SIZE - offset); | |
386 | ||
387 | /* chain first in list head */ | |
388 | first->private = (unsigned long)list; | |
389 | err = vi->rvq->vq_ops->add_buf(vi->rvq, sg, 0, MAX_SKB_FRAGS + 2, | |
390 | first); | |
391 | if (err < 0) | |
392 | give_pages(vi, first); | |
393 | ||
394 | return err; | |
296f96fc RR |
395 | } |
396 | ||
9ab86bbc | 397 | static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp) |
3f2c31d9 | 398 | { |
9ab86bbc SM |
399 | struct page *page; |
400 | struct scatterlist sg; | |
3f2c31d9 | 401 | int err; |
3f2c31d9 | 402 | |
9ab86bbc SM |
403 | page = get_a_page(vi, gfp); |
404 | if (!page) | |
405 | return -ENOMEM; | |
3f2c31d9 | 406 | |
9ab86bbc | 407 | sg_init_one(&sg, page_address(page), PAGE_SIZE); |
3f2c31d9 | 408 | |
9ab86bbc SM |
409 | err = vi->rvq->vq_ops->add_buf(vi->rvq, &sg, 0, 1, page); |
410 | if (err < 0) | |
411 | give_pages(vi, page); | |
3f2c31d9 | 412 | |
9ab86bbc SM |
413 | return err; |
414 | } | |
3f2c31d9 | 415 | |
9ab86bbc SM |
416 | /* Returns false if we couldn't fill entirely (OOM). */ |
417 | static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) | |
418 | { | |
419 | int err; | |
420 | bool oom = false; | |
3f2c31d9 | 421 | |
9ab86bbc SM |
422 | do { |
423 | if (vi->mergeable_rx_bufs) | |
424 | err = add_recvbuf_mergeable(vi, gfp); | |
425 | else if (vi->big_packets) | |
426 | err = add_recvbuf_big(vi, gfp); | |
427 | else | |
428 | err = add_recvbuf_small(vi, gfp); | |
3f2c31d9 | 429 | |
3c1b27d5 | 430 | if (err < 0) { |
9ab86bbc | 431 | oom = true; |
3f2c31d9 MM |
432 | break; |
433 | } | |
9ab86bbc | 434 | ++vi->num; |
0aea51c3 | 435 | } while (err > 0); |
3f2c31d9 MM |
436 | if (unlikely(vi->num > vi->max)) |
437 | vi->max = vi->num; | |
438 | vi->rvq->vq_ops->kick(vi->rvq); | |
3161e453 | 439 | return !oom; |
3f2c31d9 MM |
440 | } |
441 | ||
18445c4d | 442 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
443 | { |
444 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d | 445 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
288379f0 | 446 | if (napi_schedule_prep(&vi->napi)) { |
18445c4d | 447 | rvq->vq_ops->disable_cb(rvq); |
288379f0 | 448 | __napi_schedule(&vi->napi); |
18445c4d | 449 | } |
296f96fc RR |
450 | } |
451 | ||
3161e453 RR |
452 | static void refill_work(struct work_struct *work) |
453 | { | |
454 | struct virtnet_info *vi; | |
455 | bool still_empty; | |
456 | ||
457 | vi = container_of(work, struct virtnet_info, refill.work); | |
458 | napi_disable(&vi->napi); | |
39d32157 | 459 | still_empty = !try_fill_recv(vi, GFP_KERNEL); |
3161e453 RR |
460 | napi_enable(&vi->napi); |
461 | ||
462 | /* In theory, this can happen: if we don't get any buffers in | |
463 | * we will *never* try to fill again. */ | |
464 | if (still_empty) | |
465 | schedule_delayed_work(&vi->refill, HZ/2); | |
466 | } | |
467 | ||
296f96fc RR |
468 | static int virtnet_poll(struct napi_struct *napi, int budget) |
469 | { | |
470 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
9ab86bbc | 471 | void *buf; |
296f96fc RR |
472 | unsigned int len, received = 0; |
473 | ||
474 | again: | |
475 | while (received < budget && | |
9ab86bbc SM |
476 | (buf = vi->rvq->vq_ops->get_buf(vi->rvq, &len)) != NULL) { |
477 | receive_buf(vi->dev, buf, len); | |
478 | --vi->num; | |
296f96fc RR |
479 | received++; |
480 | } | |
481 | ||
3161e453 RR |
482 | if (vi->num < vi->max / 2) { |
483 | if (!try_fill_recv(vi, GFP_ATOMIC)) | |
484 | schedule_delayed_work(&vi->refill, 0); | |
485 | } | |
296f96fc | 486 | |
8329d98e RR |
487 | /* Out of packets? */ |
488 | if (received < budget) { | |
288379f0 | 489 | napi_complete(napi); |
8e95a202 JP |
490 | if (unlikely(!vi->rvq->vq_ops->enable_cb(vi->rvq)) && |
491 | napi_schedule_prep(napi)) { | |
4265f161 | 492 | vi->rvq->vq_ops->disable_cb(vi->rvq); |
288379f0 | 493 | __napi_schedule(napi); |
296f96fc | 494 | goto again; |
4265f161 | 495 | } |
296f96fc RR |
496 | } |
497 | ||
498 | return received; | |
499 | } | |
500 | ||
48925e37 | 501 | static unsigned int free_old_xmit_skbs(struct virtnet_info *vi) |
296f96fc RR |
502 | { |
503 | struct sk_buff *skb; | |
48925e37 | 504 | unsigned int len, tot_sgs = 0; |
296f96fc RR |
505 | |
506 | while ((skb = vi->svq->vq_ops->get_buf(vi->svq, &len)) != NULL) { | |
507 | pr_debug("Sent skb %p\n", skb); | |
508 | __skb_unlink(skb, &vi->send); | |
655aa31f | 509 | vi->dev->stats.tx_bytes += skb->len; |
296f96fc | 510 | vi->dev->stats.tx_packets++; |
48925e37 | 511 | tot_sgs += skb_vnet_hdr(skb)->num_sg; |
ed79bab8 | 512 | dev_kfree_skb_any(skb); |
296f96fc | 513 | } |
48925e37 | 514 | return tot_sgs; |
296f96fc RR |
515 | } |
516 | ||
99ffc696 | 517 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 518 | { |
05271685 | 519 | struct scatterlist sg[2+MAX_SKB_FRAGS]; |
b3f24698 | 520 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
296f96fc | 521 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
296f96fc | 522 | |
05271685 | 523 | sg_init_table(sg, 2+MAX_SKB_FRAGS); |
4d125de3 | 524 | |
e174961c | 525 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 526 | |
296f96fc | 527 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 RR |
528 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
529 | hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb); | |
530 | hdr->hdr.csum_offset = skb->csum_offset; | |
296f96fc | 531 | } else { |
b3f24698 RR |
532 | hdr->hdr.flags = 0; |
533 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
534 | } |
535 | ||
536 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
537 | hdr->hdr.hdr_len = skb_headlen(skb); |
538 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 539 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 540 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 541 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 542 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 543 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 544 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
545 | else |
546 | BUG(); | |
34a48579 | 547 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 548 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 549 | } else { |
b3f24698 RR |
550 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
551 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
552 | } |
553 | ||
b3f24698 | 554 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 MM |
555 | |
556 | /* Encode metadata header at front. */ | |
557 | if (vi->mergeable_rx_bufs) | |
9ab86bbc | 558 | sg_set_buf(sg, &hdr->mhdr, sizeof hdr->mhdr); |
3f2c31d9 | 559 | else |
9ab86bbc | 560 | sg_set_buf(sg, &hdr->hdr, sizeof hdr->hdr); |
3f2c31d9 | 561 | |
48925e37 RR |
562 | hdr->num_sg = skb_to_sgvec(skb, sg+1, 0, skb->len) + 1; |
563 | return vi->svq->vq_ops->add_buf(vi->svq, sg, hdr->num_sg, 0, skb); | |
11a3a154 RR |
564 | } |
565 | ||
424efe9c | 566 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
567 | { |
568 | struct virtnet_info *vi = netdev_priv(dev); | |
48925e37 | 569 | int capacity; |
2cb9c6ba RR |
570 | |
571 | again: | |
572 | /* Free up any pending old buffers before queueing new ones. */ | |
573 | free_old_xmit_skbs(vi); | |
99ffc696 | 574 | |
03f191ba | 575 | /* Try to transmit */ |
48925e37 RR |
576 | capacity = xmit_skb(vi, skb); |
577 | ||
578 | /* This can happen with OOM and indirect buffers. */ | |
579 | if (unlikely(capacity < 0)) { | |
580 | netif_stop_queue(dev); | |
581 | dev_warn(&dev->dev, "Unexpected full queue\n"); | |
582 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
583 | vi->svq->vq_ops->disable_cb(vi->svq); | |
584 | netif_start_queue(dev); | |
585 | goto again; | |
586 | } | |
587 | return NETDEV_TX_BUSY; | |
296f96fc | 588 | } |
48925e37 | 589 | vi->svq->vq_ops->kick(vi->svq); |
03f191ba MT |
590 | |
591 | /* | |
592 | * Put new one in send queue. You'd expect we'd need this before | |
593 | * xmit_skb calls add_buf(), since the callback can be triggered | |
594 | * immediately after that. But since the callback just triggers | |
595 | * another call back here, normal network xmit locking prevents the | |
596 | * race. | |
597 | */ | |
598 | __skb_queue_head(&vi->send, skb); | |
599 | ||
48925e37 RR |
600 | /* Don't wait up for transmitted skbs to be freed. */ |
601 | skb_orphan(skb); | |
602 | nf_reset(skb); | |
603 | ||
604 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
605 | * before it gets out of hand. Naturally, this wastes entries. */ | |
606 | if (capacity < 2+MAX_SKB_FRAGS) { | |
607 | netif_stop_queue(dev); | |
608 | if (unlikely(!vi->svq->vq_ops->enable_cb(vi->svq))) { | |
609 | /* More just got used, free them then recheck. */ | |
610 | capacity += free_old_xmit_skbs(vi); | |
611 | if (capacity >= 2+MAX_SKB_FRAGS) { | |
612 | netif_start_queue(dev); | |
613 | vi->svq->vq_ops->disable_cb(vi->svq); | |
614 | } | |
615 | } | |
99ffc696 | 616 | } |
48925e37 RR |
617 | |
618 | return NETDEV_TX_OK; | |
296f96fc RR |
619 | } |
620 | ||
9c46f6d4 AW |
621 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
622 | { | |
623 | struct virtnet_info *vi = netdev_priv(dev); | |
624 | struct virtio_device *vdev = vi->vdev; | |
625 | int ret; | |
626 | ||
627 | ret = eth_mac_addr(dev, p); | |
628 | if (ret) | |
629 | return ret; | |
630 | ||
62994b2d AW |
631 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
632 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), | |
633 | dev->dev_addr, dev->addr_len); | |
9c46f6d4 AW |
634 | |
635 | return 0; | |
636 | } | |
637 | ||
da74e89d AS |
638 | #ifdef CONFIG_NET_POLL_CONTROLLER |
639 | static void virtnet_netpoll(struct net_device *dev) | |
640 | { | |
641 | struct virtnet_info *vi = netdev_priv(dev); | |
642 | ||
643 | napi_schedule(&vi->napi); | |
644 | } | |
645 | #endif | |
646 | ||
296f96fc RR |
647 | static int virtnet_open(struct net_device *dev) |
648 | { | |
649 | struct virtnet_info *vi = netdev_priv(dev); | |
650 | ||
296f96fc | 651 | napi_enable(&vi->napi); |
a48bd8f6 RR |
652 | |
653 | /* If all buffers were filled by other side before we napi_enabled, we | |
654 | * won't get another interrupt, so process any outstanding packets | |
370076d9 CB |
655 | * now. virtnet_poll wants re-enable the queue, so we disable here. |
656 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
288379f0 | 657 | if (napi_schedule_prep(&vi->napi)) { |
370076d9 | 658 | vi->rvq->vq_ops->disable_cb(vi->rvq); |
288379f0 | 659 | __napi_schedule(&vi->napi); |
370076d9 | 660 | } |
296f96fc RR |
661 | return 0; |
662 | } | |
663 | ||
2a41f71d AW |
664 | /* |
665 | * Send command via the control virtqueue and check status. Commands | |
666 | * supported by the hypervisor, as indicated by feature bits, should | |
667 | * never fail unless improperly formated. | |
668 | */ | |
669 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
670 | struct scatterlist *data, int out, int in) | |
671 | { | |
23e258e1 | 672 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
2a41f71d AW |
673 | struct virtio_net_ctrl_hdr ctrl; |
674 | virtio_net_ctrl_ack status = ~0; | |
675 | unsigned int tmp; | |
23e258e1 | 676 | int i; |
2a41f71d | 677 | |
0ee904c3 AB |
678 | /* Caller should know better */ |
679 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || | |
680 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); | |
2a41f71d AW |
681 | |
682 | out++; /* Add header */ | |
683 | in++; /* Add return status */ | |
684 | ||
685 | ctrl.class = class; | |
686 | ctrl.cmd = cmd; | |
687 | ||
688 | sg_init_table(sg, out + in); | |
689 | ||
690 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); | |
23e258e1 AW |
691 | for_each_sg(data, s, out + in - 2, i) |
692 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); | |
2a41f71d AW |
693 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
694 | ||
3c1b27d5 | 695 | BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi) < 0); |
2a41f71d AW |
696 | |
697 | vi->cvq->vq_ops->kick(vi->cvq); | |
698 | ||
699 | /* | |
700 | * Spin for a response, the kick causes an ioport write, trapping | |
701 | * into the hypervisor, so the request should be handled immediately. | |
702 | */ | |
703 | while (!vi->cvq->vq_ops->get_buf(vi->cvq, &tmp)) | |
704 | cpu_relax(); | |
705 | ||
706 | return status == VIRTIO_NET_OK; | |
707 | } | |
708 | ||
296f96fc RR |
709 | static int virtnet_close(struct net_device *dev) |
710 | { | |
711 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc RR |
712 | |
713 | napi_disable(&vi->napi); | |
714 | ||
296f96fc RR |
715 | return 0; |
716 | } | |
717 | ||
a9ea3fc6 HX |
718 | static int virtnet_set_tx_csum(struct net_device *dev, u32 data) |
719 | { | |
720 | struct virtnet_info *vi = netdev_priv(dev); | |
721 | struct virtio_device *vdev = vi->vdev; | |
722 | ||
723 | if (data && !virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) | |
724 | return -ENOSYS; | |
725 | ||
726 | return ethtool_op_set_tx_hw_csum(dev, data); | |
727 | } | |
728 | ||
2af7698e AW |
729 | static void virtnet_set_rx_mode(struct net_device *dev) |
730 | { | |
731 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 732 | struct scatterlist sg[2]; |
2af7698e | 733 | u8 promisc, allmulti; |
f565a7c2 AW |
734 | struct virtio_net_ctrl_mac *mac_data; |
735 | struct dev_addr_list *addr; | |
ccffad25 | 736 | struct netdev_hw_addr *ha; |
32e7bfc4 | 737 | int uc_count; |
4cd24eaf | 738 | int mc_count; |
f565a7c2 AW |
739 | void *buf; |
740 | int i; | |
2af7698e AW |
741 | |
742 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
743 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
744 | return; | |
745 | ||
f565a7c2 AW |
746 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
747 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 748 | |
23e258e1 | 749 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
750 | |
751 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
752 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f565a7c2 | 753 | sg, 1, 0)) |
2af7698e AW |
754 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
755 | promisc ? "en" : "dis"); | |
756 | ||
23e258e1 | 757 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
758 | |
759 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
760 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f565a7c2 | 761 | sg, 1, 0)) |
2af7698e AW |
762 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
763 | allmulti ? "en" : "dis"); | |
f565a7c2 | 764 | |
32e7bfc4 | 765 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 766 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 767 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
768 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
769 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
770 | mac_data = buf; | |
f565a7c2 AW |
771 | if (!buf) { |
772 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); | |
773 | return; | |
774 | } | |
775 | ||
23e258e1 AW |
776 | sg_init_table(sg, 2); |
777 | ||
f565a7c2 | 778 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 779 | mac_data->entries = uc_count; |
ccffad25 | 780 | i = 0; |
32e7bfc4 | 781 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 782 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
783 | |
784 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 785 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
786 | |
787 | /* multicast list and count fill the end */ | |
32e7bfc4 | 788 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 789 | |
4cd24eaf | 790 | mac_data->entries = mc_count; |
f565a7c2 | 791 | addr = dev->mc_list; |
4cd24eaf | 792 | for (i = 0; i < mc_count; i++, addr = addr->next) |
f565a7c2 AW |
793 | memcpy(&mac_data->macs[i][0], addr->da_addr, ETH_ALEN); |
794 | ||
795 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 796 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
797 | |
798 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
799 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
800 | sg, 2, 0)) | |
801 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); | |
802 | ||
803 | kfree(buf); | |
2af7698e AW |
804 | } |
805 | ||
1824a989 | 806 | static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
807 | { |
808 | struct virtnet_info *vi = netdev_priv(dev); | |
809 | struct scatterlist sg; | |
810 | ||
23e258e1 | 811 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
812 | |
813 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
814 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) | |
815 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); | |
816 | } | |
817 | ||
1824a989 | 818 | static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
819 | { |
820 | struct virtnet_info *vi = netdev_priv(dev); | |
821 | struct scatterlist sg; | |
822 | ||
23e258e1 | 823 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
824 | |
825 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
826 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) | |
827 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); | |
828 | } | |
829 | ||
0fc0b732 | 830 | static const struct ethtool_ops virtnet_ethtool_ops = { |
a9ea3fc6 HX |
831 | .set_tx_csum = virtnet_set_tx_csum, |
832 | .set_sg = ethtool_op_set_sg, | |
0276b497 | 833 | .set_tso = ethtool_op_set_tso, |
5c516751 | 834 | .set_ufo = ethtool_op_set_ufo, |
9f4d26d0 | 835 | .get_link = ethtool_op_get_link, |
a9ea3fc6 HX |
836 | }; |
837 | ||
39da5814 MM |
838 | #define MIN_MTU 68 |
839 | #define MAX_MTU 65535 | |
840 | ||
841 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
842 | { | |
843 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
844 | return -EINVAL; | |
845 | dev->mtu = new_mtu; | |
846 | return 0; | |
847 | } | |
848 | ||
76288b4e SH |
849 | static const struct net_device_ops virtnet_netdev = { |
850 | .ndo_open = virtnet_open, | |
851 | .ndo_stop = virtnet_close, | |
852 | .ndo_start_xmit = start_xmit, | |
853 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 854 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 855 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 856 | .ndo_change_mtu = virtnet_change_mtu, |
1824a989 AW |
857 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
858 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
859 | #ifdef CONFIG_NET_POLL_CONTROLLER |
860 | .ndo_poll_controller = virtnet_netpoll, | |
861 | #endif | |
862 | }; | |
863 | ||
9f4d26d0 MM |
864 | static void virtnet_update_status(struct virtnet_info *vi) |
865 | { | |
866 | u16 v; | |
867 | ||
868 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) | |
869 | return; | |
870 | ||
871 | vi->vdev->config->get(vi->vdev, | |
872 | offsetof(struct virtio_net_config, status), | |
873 | &v, sizeof(v)); | |
874 | ||
875 | /* Ignore unknown (future) status bits */ | |
876 | v &= VIRTIO_NET_S_LINK_UP; | |
877 | ||
878 | if (vi->status == v) | |
879 | return; | |
880 | ||
881 | vi->status = v; | |
882 | ||
883 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
884 | netif_carrier_on(vi->dev); | |
885 | netif_wake_queue(vi->dev); | |
886 | } else { | |
887 | netif_carrier_off(vi->dev); | |
888 | netif_stop_queue(vi->dev); | |
889 | } | |
890 | } | |
891 | ||
892 | static void virtnet_config_changed(struct virtio_device *vdev) | |
893 | { | |
894 | struct virtnet_info *vi = vdev->priv; | |
895 | ||
896 | virtnet_update_status(vi); | |
897 | } | |
898 | ||
296f96fc RR |
899 | static int virtnet_probe(struct virtio_device *vdev) |
900 | { | |
901 | int err; | |
296f96fc RR |
902 | struct net_device *dev; |
903 | struct virtnet_info *vi; | |
d2a7ddda MT |
904 | struct virtqueue *vqs[3]; |
905 | vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; | |
906 | const char *names[] = { "input", "output", "control" }; | |
907 | int nvqs; | |
296f96fc RR |
908 | |
909 | /* Allocate ourselves a network device with room for our info */ | |
910 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
911 | if (!dev) | |
912 | return -ENOMEM; | |
913 | ||
914 | /* Set up network device as normal. */ | |
76288b4e | 915 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 916 | dev->features = NETIF_F_HIGHDMA; |
a9ea3fc6 | 917 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
918 | SET_NETDEV_DEV(dev, &vdev->dev); |
919 | ||
920 | /* Do we support "hardware" checksums? */ | |
c45a6816 | 921 | if (csum && virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc RR |
922 | /* This opens up the world of extra features. */ |
923 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
c45a6816 | 924 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { |
34a48579 RR |
925 | dev->features |= NETIF_F_TSO | NETIF_F_UFO |
926 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; | |
927 | } | |
5539ae96 | 928 | /* Individual feature bits: what can host handle? */ |
c45a6816 | 929 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
5539ae96 | 930 | dev->features |= NETIF_F_TSO; |
c45a6816 | 931 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) |
5539ae96 | 932 | dev->features |= NETIF_F_TSO6; |
c45a6816 | 933 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) |
5539ae96 | 934 | dev->features |= NETIF_F_TSO_ECN; |
c45a6816 | 935 | if (gso && virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
5539ae96 | 936 | dev->features |= NETIF_F_UFO; |
296f96fc RR |
937 | } |
938 | ||
939 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
c45a6816 | 940 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
a586d4f6 RR |
941 | vdev->config->get(vdev, |
942 | offsetof(struct virtio_net_config, mac), | |
943 | dev->dev_addr, dev->addr_len); | |
62994b2d | 944 | } else |
296f96fc RR |
945 | random_ether_addr(dev->dev_addr); |
946 | ||
947 | /* Set up our device-specific information */ | |
948 | vi = netdev_priv(dev); | |
6c0cd7c0 | 949 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
950 | vi->dev = dev; |
951 | vi->vdev = vdev; | |
d9d5dcc8 | 952 | vdev->priv = vi; |
fb6813f4 | 953 | vi->pages = NULL; |
3161e453 | 954 | INIT_DELAYED_WORK(&vi->refill, refill_work); |
296f96fc | 955 | |
97402b96 | 956 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
957 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
958 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
959 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
97402b96 HX |
960 | vi->big_packets = true; |
961 | ||
3f2c31d9 MM |
962 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
963 | vi->mergeable_rx_bufs = true; | |
964 | ||
d2a7ddda MT |
965 | /* We expect two virtqueues, receive then send, |
966 | * and optionally control. */ | |
967 | nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; | |
968 | ||
969 | err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names); | |
970 | if (err) | |
296f96fc | 971 | goto free; |
296f96fc | 972 | |
d2a7ddda MT |
973 | vi->rvq = vqs[0]; |
974 | vi->svq = vqs[1]; | |
296f96fc | 975 | |
2a41f71d | 976 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { |
d2a7ddda | 977 | vi->cvq = vqs[2]; |
0bde9569 AW |
978 | |
979 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) | |
980 | dev->features |= NETIF_F_HW_VLAN_FILTER; | |
2a41f71d AW |
981 | } |
982 | ||
9ab86bbc | 983 | /* Initialize our empty send queue. */ |
296f96fc RR |
984 | skb_queue_head_init(&vi->send); |
985 | ||
986 | err = register_netdev(dev); | |
987 | if (err) { | |
988 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 989 | goto free_vqs; |
296f96fc | 990 | } |
b3369c1f RR |
991 | |
992 | /* Last of all, set up some receive buffers. */ | |
3161e453 | 993 | try_fill_recv(vi, GFP_KERNEL); |
b3369c1f RR |
994 | |
995 | /* If we didn't even get one input buffer, we're useless. */ | |
996 | if (vi->num == 0) { | |
997 | err = -ENOMEM; | |
998 | goto unregister; | |
999 | } | |
1000 | ||
9f4d26d0 MM |
1001 | vi->status = VIRTIO_NET_S_LINK_UP; |
1002 | virtnet_update_status(vi); | |
4783256e | 1003 | netif_carrier_on(dev); |
9f4d26d0 | 1004 | |
296f96fc | 1005 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
1006 | return 0; |
1007 | ||
b3369c1f RR |
1008 | unregister: |
1009 | unregister_netdev(dev); | |
3161e453 | 1010 | cancel_delayed_work_sync(&vi->refill); |
d2a7ddda MT |
1011 | free_vqs: |
1012 | vdev->config->del_vqs(vdev); | |
296f96fc RR |
1013 | free: |
1014 | free_netdev(dev); | |
1015 | return err; | |
1016 | } | |
1017 | ||
9ab86bbc SM |
1018 | static void free_unused_bufs(struct virtnet_info *vi) |
1019 | { | |
1020 | void *buf; | |
1021 | while (1) { | |
1022 | buf = vi->rvq->vq_ops->detach_unused_buf(vi->rvq); | |
1023 | if (!buf) | |
1024 | break; | |
1025 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
1026 | give_pages(vi, buf); | |
1027 | else | |
1028 | dev_kfree_skb(buf); | |
1029 | --vi->num; | |
1030 | } | |
1031 | BUG_ON(vi->num != 0); | |
1032 | } | |
1033 | ||
3d1285be | 1034 | static void __devexit virtnet_remove(struct virtio_device *vdev) |
296f96fc | 1035 | { |
74b2553f | 1036 | struct virtnet_info *vi = vdev->priv; |
b3369c1f | 1037 | |
6e5aa7ef RR |
1038 | /* Stop all the virtqueues. */ |
1039 | vdev->config->reset(vdev); | |
1040 | ||
9ab86bbc | 1041 | /* Free our skbs in send queue, if any. */ |
288369cc | 1042 | __skb_queue_purge(&vi->send); |
b3369c1f | 1043 | |
74b2553f | 1044 | unregister_netdev(vi->dev); |
3161e453 | 1045 | cancel_delayed_work_sync(&vi->refill); |
9ab86bbc | 1046 | free_unused_bufs(vi); |
fb6813f4 | 1047 | |
d2a7ddda MT |
1048 | vdev->config->del_vqs(vi->vdev); |
1049 | ||
fb6813f4 RR |
1050 | while (vi->pages) |
1051 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); | |
1052 | ||
74b2553f | 1053 | free_netdev(vi->dev); |
296f96fc RR |
1054 | } |
1055 | ||
1056 | static struct virtio_device_id id_table[] = { | |
1057 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1058 | { 0 }, | |
1059 | }; | |
1060 | ||
c45a6816 | 1061 | static unsigned int features[] = { |
5e4fe5c4 MM |
1062 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1063 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1064 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1065 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1066 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1067 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1068 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
c45a6816 RR |
1069 | }; |
1070 | ||
22402529 | 1071 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1072 | .feature_table = features, |
1073 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1074 | .driver.name = KBUILD_MODNAME, |
1075 | .driver.owner = THIS_MODULE, | |
1076 | .id_table = id_table, | |
1077 | .probe = virtnet_probe, | |
1078 | .remove = __devexit_p(virtnet_remove), | |
9f4d26d0 | 1079 | .config_changed = virtnet_config_changed, |
296f96fc RR |
1080 | }; |
1081 | ||
1082 | static int __init init(void) | |
1083 | { | |
22402529 | 1084 | return register_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1085 | } |
1086 | ||
1087 | static void __exit fini(void) | |
1088 | { | |
22402529 | 1089 | unregister_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1090 | } |
1091 | module_init(init); | |
1092 | module_exit(fini); | |
1093 | ||
1094 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1095 | MODULE_DESCRIPTION("Virtio network driver"); | |
1096 | MODULE_LICENSE("GPL"); |