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> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
296f96fc | 29 | |
6c0cd7c0 DL |
30 | static int napi_weight = 128; |
31 | module_param(napi_weight, int, 0444); | |
32 | ||
34a48579 RR |
33 | static int csum = 1, gso = 1; |
34 | module_param(csum, bool, 0444); | |
35 | module_param(gso, bool, 0444); | |
36 | ||
296f96fc | 37 | /* FIXME: MTU in config. */ |
e918085a | 38 | #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 39 | #define GOOD_COPY_LEN 128 |
296f96fc | 40 | |
f565a7c2 | 41 | #define VIRTNET_SEND_COMMAND_SG_MAX 2 |
2a41f71d | 42 | |
3fa2a1df | 43 | struct virtnet_stats { |
44 | struct u64_stats_sync syncp; | |
45 | u64 tx_bytes; | |
46 | u64 tx_packets; | |
47 | ||
48 | u64 rx_bytes; | |
49 | u64 rx_packets; | |
50 | }; | |
51 | ||
5e01d2f9 | 52 | struct virtnet_info { |
296f96fc | 53 | struct virtio_device *vdev; |
2a41f71d | 54 | struct virtqueue *rvq, *svq, *cvq; |
296f96fc RR |
55 | struct net_device *dev; |
56 | struct napi_struct napi; | |
9f4d26d0 | 57 | unsigned int status; |
296f96fc RR |
58 | |
59 | /* Number of input buffers, and max we've ever had. */ | |
60 | unsigned int num, max; | |
61 | ||
97402b96 HX |
62 | /* I like... big packets and I cannot lie! */ |
63 | bool big_packets; | |
64 | ||
3f2c31d9 MM |
65 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
66 | bool mergeable_rx_bufs; | |
67 | ||
3fa2a1df | 68 | /* Active statistics */ |
69 | struct virtnet_stats __percpu *stats; | |
70 | ||
3161e453 RR |
71 | /* Work struct for refilling if we run low on memory. */ |
72 | struct delayed_work refill; | |
73 | ||
fb6813f4 RR |
74 | /* Chain pages by the private ptr. */ |
75 | struct page *pages; | |
5e01d2f9 MT |
76 | |
77 | /* fragments + linear part + virtio header */ | |
78 | struct scatterlist rx_sg[MAX_SKB_FRAGS + 2]; | |
79 | struct scatterlist tx_sg[MAX_SKB_FRAGS + 2]; | |
296f96fc RR |
80 | }; |
81 | ||
b3f24698 RR |
82 | struct skb_vnet_hdr { |
83 | union { | |
84 | struct virtio_net_hdr hdr; | |
85 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
86 | }; | |
48925e37 | 87 | unsigned int num_sg; |
b3f24698 RR |
88 | }; |
89 | ||
9ab86bbc SM |
90 | struct padded_vnet_hdr { |
91 | struct virtio_net_hdr hdr; | |
92 | /* | |
93 | * virtio_net_hdr should be in a separated sg buffer because of a | |
94 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
95 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
96 | */ | |
97 | char padding[6]; | |
98 | }; | |
99 | ||
b3f24698 | 100 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 101 | { |
b3f24698 | 102 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
103 | } |
104 | ||
9ab86bbc SM |
105 | /* |
106 | * private is used to chain pages for big packets, put the whole | |
107 | * most recent used list in the beginning for reuse | |
108 | */ | |
109 | static void give_pages(struct virtnet_info *vi, struct page *page) | |
0a888fd1 | 110 | { |
9ab86bbc | 111 | struct page *end; |
0a888fd1 | 112 | |
9ab86bbc SM |
113 | /* Find end of list, sew whole thing into vi->pages. */ |
114 | for (end = page; end->private; end = (struct page *)end->private); | |
115 | end->private = (unsigned long)vi->pages; | |
116 | vi->pages = page; | |
0a888fd1 MM |
117 | } |
118 | ||
fb6813f4 RR |
119 | static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) |
120 | { | |
121 | struct page *p = vi->pages; | |
122 | ||
9ab86bbc | 123 | if (p) { |
fb6813f4 | 124 | vi->pages = (struct page *)p->private; |
9ab86bbc SM |
125 | /* clear private here, it is used to chain pages */ |
126 | p->private = 0; | |
127 | } else | |
fb6813f4 RR |
128 | p = alloc_page(gfp_mask); |
129 | return p; | |
130 | } | |
131 | ||
2cb9c6ba | 132 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 133 | { |
2cb9c6ba | 134 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 135 | |
2cb9c6ba | 136 | /* Suppress further interrupts. */ |
1915a712 | 137 | virtqueue_disable_cb(svq); |
11a3a154 | 138 | |
363f1514 | 139 | /* We were probably waiting for more output buffers. */ |
296f96fc | 140 | netif_wake_queue(vi->dev); |
296f96fc RR |
141 | } |
142 | ||
9ab86bbc SM |
143 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
144 | unsigned int offset, unsigned int *len) | |
296f96fc | 145 | { |
9ab86bbc SM |
146 | int i = skb_shinfo(skb)->nr_frags; |
147 | skb_frag_t *f; | |
148 | ||
149 | f = &skb_shinfo(skb)->frags[i]; | |
150 | f->size = min((unsigned)PAGE_SIZE - offset, *len); | |
151 | f->page_offset = offset; | |
152 | f->page = page; | |
153 | ||
154 | skb->data_len += f->size; | |
155 | skb->len += f->size; | |
156 | skb_shinfo(skb)->nr_frags++; | |
157 | *len -= f->size; | |
158 | } | |
23cde76d | 159 | |
9ab86bbc SM |
160 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
161 | struct page *page, unsigned int len) | |
162 | { | |
163 | struct sk_buff *skb; | |
164 | struct skb_vnet_hdr *hdr; | |
165 | unsigned int copy, hdr_len, offset; | |
166 | char *p; | |
fb6813f4 | 167 | |
9ab86bbc | 168 | p = page_address(page); |
3f2c31d9 | 169 | |
9ab86bbc SM |
170 | /* copy small packet so we can reuse these pages for small data */ |
171 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
172 | if (unlikely(!skb)) | |
173 | return NULL; | |
3f2c31d9 | 174 | |
9ab86bbc | 175 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 176 | |
9ab86bbc SM |
177 | if (vi->mergeable_rx_bufs) { |
178 | hdr_len = sizeof hdr->mhdr; | |
179 | offset = hdr_len; | |
180 | } else { | |
181 | hdr_len = sizeof hdr->hdr; | |
182 | offset = sizeof(struct padded_vnet_hdr); | |
183 | } | |
3f2c31d9 | 184 | |
9ab86bbc | 185 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 186 | |
9ab86bbc SM |
187 | len -= hdr_len; |
188 | p += offset; | |
3f2c31d9 | 189 | |
9ab86bbc SM |
190 | copy = len; |
191 | if (copy > skb_tailroom(skb)) | |
192 | copy = skb_tailroom(skb); | |
193 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 194 | |
9ab86bbc SM |
195 | len -= copy; |
196 | offset += copy; | |
3f2c31d9 | 197 | |
9ab86bbc SM |
198 | while (len) { |
199 | set_skb_frag(skb, page, offset, &len); | |
200 | page = (struct page *)page->private; | |
201 | offset = 0; | |
202 | } | |
3f2c31d9 | 203 | |
9ab86bbc SM |
204 | if (page) |
205 | give_pages(vi, page); | |
3f2c31d9 | 206 | |
9ab86bbc SM |
207 | return skb; |
208 | } | |
3f2c31d9 | 209 | |
9ab86bbc SM |
210 | static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb) |
211 | { | |
212 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); | |
213 | struct page *page; | |
214 | int num_buf, i, len; | |
215 | ||
216 | num_buf = hdr->mhdr.num_buffers; | |
217 | while (--num_buf) { | |
218 | i = skb_shinfo(skb)->nr_frags; | |
219 | if (i >= MAX_SKB_FRAGS) { | |
220 | pr_debug("%s: packet too long\n", skb->dev->name); | |
221 | skb->dev->stats.rx_length_errors++; | |
222 | return -EINVAL; | |
223 | } | |
1915a712 | 224 | page = virtqueue_get_buf(vi->rvq, &len); |
9ab86bbc SM |
225 | if (!page) { |
226 | pr_debug("%s: rx error: %d buffers missing\n", | |
227 | skb->dev->name, hdr->mhdr.num_buffers); | |
228 | skb->dev->stats.rx_length_errors++; | |
229 | return -EINVAL; | |
3f2c31d9 | 230 | } |
3fa2a1df | 231 | |
9ab86bbc SM |
232 | if (len > PAGE_SIZE) |
233 | len = PAGE_SIZE; | |
234 | ||
235 | set_skb_frag(skb, page, 0, &len); | |
236 | ||
237 | --vi->num; | |
238 | } | |
239 | return 0; | |
240 | } | |
241 | ||
242 | static void receive_buf(struct net_device *dev, void *buf, unsigned int len) | |
243 | { | |
244 | struct virtnet_info *vi = netdev_priv(dev); | |
3fa2a1df | 245 | struct virtnet_stats __percpu *stats = this_cpu_ptr(vi->stats); |
9ab86bbc SM |
246 | struct sk_buff *skb; |
247 | struct page *page; | |
248 | struct skb_vnet_hdr *hdr; | |
3f2c31d9 | 249 | |
9ab86bbc SM |
250 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
251 | pr_debug("%s: short packet %i\n", dev->name, len); | |
252 | dev->stats.rx_length_errors++; | |
253 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
254 | give_pages(vi, buf); | |
255 | else | |
256 | dev_kfree_skb(buf); | |
257 | return; | |
258 | } | |
3f2c31d9 | 259 | |
9ab86bbc SM |
260 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
261 | skb = buf; | |
262 | len -= sizeof(struct virtio_net_hdr); | |
263 | skb_trim(skb, len); | |
264 | } else { | |
265 | page = buf; | |
266 | skb = page_to_skb(vi, page, len); | |
267 | if (unlikely(!skb)) { | |
3f2c31d9 | 268 | dev->stats.rx_dropped++; |
9ab86bbc SM |
269 | give_pages(vi, page); |
270 | return; | |
3f2c31d9 | 271 | } |
9ab86bbc SM |
272 | if (vi->mergeable_rx_bufs) |
273 | if (receive_mergeable(vi, skb)) { | |
274 | dev_kfree_skb(skb); | |
275 | return; | |
276 | } | |
97402b96 | 277 | } |
3f2c31d9 | 278 | |
9ab86bbc | 279 | hdr = skb_vnet_hdr(skb); |
97402b96 | 280 | skb->truesize += skb->data_len; |
3fa2a1df | 281 | |
282 | u64_stats_update_begin(&stats->syncp); | |
283 | stats->rx_bytes += skb->len; | |
284 | stats->rx_packets++; | |
285 | u64_stats_update_end(&stats->syncp); | |
296f96fc | 286 | |
b3f24698 | 287 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 288 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
289 | if (!skb_partial_csum_set(skb, |
290 | hdr->hdr.csum_start, | |
291 | hdr->hdr.csum_offset)) | |
296f96fc | 292 | goto frame_err; |
10a8d94a JW |
293 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
294 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
295 | } |
296 | ||
23cde76d MM |
297 | skb->protocol = eth_type_trans(skb, dev); |
298 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
299 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
300 | ||
b3f24698 | 301 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 302 | pr_debug("GSO!\n"); |
b3f24698 | 303 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
304 | case VIRTIO_NET_HDR_GSO_TCPV4: |
305 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
306 | break; | |
296f96fc RR |
307 | case VIRTIO_NET_HDR_GSO_UDP: |
308 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
309 | break; | |
310 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
311 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
312 | break; | |
313 | default: | |
314 | if (net_ratelimit()) | |
315 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
b3f24698 | 316 | dev->name, hdr->hdr.gso_type); |
296f96fc RR |
317 | goto frame_err; |
318 | } | |
319 | ||
b3f24698 | 320 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
34a48579 RR |
321 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
322 | ||
b3f24698 | 323 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc RR |
324 | if (skb_shinfo(skb)->gso_size == 0) { |
325 | if (net_ratelimit()) | |
326 | printk(KERN_WARNING "%s: zero gso size.\n", | |
327 | dev->name); | |
328 | goto frame_err; | |
329 | } | |
330 | ||
331 | /* Header must be checked, and gso_segs computed. */ | |
332 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
333 | skb_shinfo(skb)->gso_segs = 0; | |
334 | } | |
335 | ||
336 | netif_receive_skb(skb); | |
337 | return; | |
338 | ||
339 | frame_err: | |
340 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
341 | dev_kfree_skb(skb); |
342 | } | |
343 | ||
9ab86bbc | 344 | static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp) |
296f96fc RR |
345 | { |
346 | struct sk_buff *skb; | |
9ab86bbc | 347 | struct skb_vnet_hdr *hdr; |
9ab86bbc | 348 | int err; |
3f2c31d9 | 349 | |
9ab86bbc SM |
350 | skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN); |
351 | if (unlikely(!skb)) | |
352 | return -ENOMEM; | |
296f96fc | 353 | |
9ab86bbc | 354 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 355 | |
9ab86bbc | 356 | hdr = skb_vnet_hdr(skb); |
5e01d2f9 | 357 | sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr); |
97402b96 | 358 | |
5e01d2f9 | 359 | skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len); |
97402b96 | 360 | |
aa989f5e | 361 | err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, 2, skb, gfp); |
9ab86bbc SM |
362 | if (err < 0) |
363 | dev_kfree_skb(skb); | |
97402b96 | 364 | |
9ab86bbc SM |
365 | return err; |
366 | } | |
97402b96 | 367 | |
9ab86bbc SM |
368 | static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp) |
369 | { | |
9ab86bbc SM |
370 | struct page *first, *list = NULL; |
371 | char *p; | |
372 | int i, err, offset; | |
373 | ||
5e01d2f9 | 374 | /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc SM |
375 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
376 | first = get_a_page(vi, gfp); | |
377 | if (!first) { | |
378 | if (list) | |
379 | give_pages(vi, list); | |
380 | return -ENOMEM; | |
97402b96 | 381 | } |
5e01d2f9 | 382 | sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 383 | |
9ab86bbc SM |
384 | /* chain new page in list head to match sg */ |
385 | first->private = (unsigned long)list; | |
386 | list = first; | |
387 | } | |
296f96fc | 388 | |
9ab86bbc SM |
389 | first = get_a_page(vi, gfp); |
390 | if (!first) { | |
391 | give_pages(vi, list); | |
392 | return -ENOMEM; | |
393 | } | |
394 | p = page_address(first); | |
395 | ||
5e01d2f9 MT |
396 | /* vi->rx_sg[0], vi->rx_sg[1] share the same page */ |
397 | /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */ | |
398 | sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr)); | |
9ab86bbc | 399 | |
5e01d2f9 | 400 | /* vi->rx_sg[1] for data packet, from offset */ |
9ab86bbc | 401 | offset = sizeof(struct padded_vnet_hdr); |
5e01d2f9 | 402 | sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
403 | |
404 | /* chain first in list head */ | |
405 | first->private = (unsigned long)list; | |
aa989f5e MT |
406 | err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2, |
407 | first, gfp); | |
9ab86bbc SM |
408 | if (err < 0) |
409 | give_pages(vi, first); | |
410 | ||
411 | return err; | |
296f96fc RR |
412 | } |
413 | ||
9ab86bbc | 414 | static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp) |
3f2c31d9 | 415 | { |
9ab86bbc | 416 | struct page *page; |
3f2c31d9 | 417 | int err; |
3f2c31d9 | 418 | |
9ab86bbc SM |
419 | page = get_a_page(vi, gfp); |
420 | if (!page) | |
421 | return -ENOMEM; | |
3f2c31d9 | 422 | |
5e01d2f9 | 423 | sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE); |
3f2c31d9 | 424 | |
aa989f5e | 425 | err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, 1, page, gfp); |
9ab86bbc SM |
426 | if (err < 0) |
427 | give_pages(vi, page); | |
3f2c31d9 | 428 | |
9ab86bbc SM |
429 | return err; |
430 | } | |
3f2c31d9 | 431 | |
9ab86bbc SM |
432 | /* Returns false if we couldn't fill entirely (OOM). */ |
433 | static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) | |
434 | { | |
435 | int err; | |
1788f495 | 436 | bool oom; |
3f2c31d9 | 437 | |
9ab86bbc SM |
438 | do { |
439 | if (vi->mergeable_rx_bufs) | |
440 | err = add_recvbuf_mergeable(vi, gfp); | |
441 | else if (vi->big_packets) | |
442 | err = add_recvbuf_big(vi, gfp); | |
443 | else | |
444 | err = add_recvbuf_small(vi, gfp); | |
3f2c31d9 | 445 | |
1788f495 MT |
446 | oom = err == -ENOMEM; |
447 | if (err < 0) | |
3f2c31d9 | 448 | break; |
9ab86bbc | 449 | ++vi->num; |
0aea51c3 | 450 | } while (err > 0); |
3f2c31d9 MM |
451 | if (unlikely(vi->num > vi->max)) |
452 | vi->max = vi->num; | |
1915a712 | 453 | virtqueue_kick(vi->rvq); |
3161e453 | 454 | return !oom; |
3f2c31d9 MM |
455 | } |
456 | ||
18445c4d | 457 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
458 | { |
459 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d | 460 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
288379f0 | 461 | if (napi_schedule_prep(&vi->napi)) { |
1915a712 | 462 | virtqueue_disable_cb(rvq); |
288379f0 | 463 | __napi_schedule(&vi->napi); |
18445c4d | 464 | } |
296f96fc RR |
465 | } |
466 | ||
3e9d08ec BR |
467 | static void virtnet_napi_enable(struct virtnet_info *vi) |
468 | { | |
469 | napi_enable(&vi->napi); | |
470 | ||
471 | /* If all buffers were filled by other side before we napi_enabled, we | |
472 | * won't get another interrupt, so process any outstanding packets | |
473 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
474 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
475 | if (napi_schedule_prep(&vi->napi)) { | |
476 | virtqueue_disable_cb(vi->rvq); | |
477 | __napi_schedule(&vi->napi); | |
478 | } | |
479 | } | |
480 | ||
3161e453 RR |
481 | static void refill_work(struct work_struct *work) |
482 | { | |
483 | struct virtnet_info *vi; | |
484 | bool still_empty; | |
485 | ||
486 | vi = container_of(work, struct virtnet_info, refill.work); | |
487 | napi_disable(&vi->napi); | |
39d32157 | 488 | still_empty = !try_fill_recv(vi, GFP_KERNEL); |
3e9d08ec | 489 | virtnet_napi_enable(vi); |
3161e453 RR |
490 | |
491 | /* In theory, this can happen: if we don't get any buffers in | |
492 | * we will *never* try to fill again. */ | |
493 | if (still_empty) | |
494 | schedule_delayed_work(&vi->refill, HZ/2); | |
495 | } | |
496 | ||
296f96fc RR |
497 | static int virtnet_poll(struct napi_struct *napi, int budget) |
498 | { | |
499 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
9ab86bbc | 500 | void *buf; |
296f96fc RR |
501 | unsigned int len, received = 0; |
502 | ||
503 | again: | |
504 | while (received < budget && | |
1915a712 | 505 | (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) { |
9ab86bbc SM |
506 | receive_buf(vi->dev, buf, len); |
507 | --vi->num; | |
296f96fc RR |
508 | received++; |
509 | } | |
510 | ||
3161e453 RR |
511 | if (vi->num < vi->max / 2) { |
512 | if (!try_fill_recv(vi, GFP_ATOMIC)) | |
513 | schedule_delayed_work(&vi->refill, 0); | |
514 | } | |
296f96fc | 515 | |
8329d98e RR |
516 | /* Out of packets? */ |
517 | if (received < budget) { | |
288379f0 | 518 | napi_complete(napi); |
1915a712 | 519 | if (unlikely(!virtqueue_enable_cb(vi->rvq)) && |
8e95a202 | 520 | napi_schedule_prep(napi)) { |
1915a712 | 521 | virtqueue_disable_cb(vi->rvq); |
288379f0 | 522 | __napi_schedule(napi); |
296f96fc | 523 | goto again; |
4265f161 | 524 | } |
296f96fc RR |
525 | } |
526 | ||
527 | return received; | |
528 | } | |
529 | ||
48925e37 | 530 | static unsigned int free_old_xmit_skbs(struct virtnet_info *vi) |
296f96fc RR |
531 | { |
532 | struct sk_buff *skb; | |
48925e37 | 533 | unsigned int len, tot_sgs = 0; |
3fa2a1df | 534 | struct virtnet_stats __percpu *stats = this_cpu_ptr(vi->stats); |
296f96fc | 535 | |
1915a712 | 536 | while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) { |
296f96fc | 537 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 538 | |
539 | u64_stats_update_begin(&stats->syncp); | |
540 | stats->tx_bytes += skb->len; | |
541 | stats->tx_packets++; | |
542 | u64_stats_update_end(&stats->syncp); | |
543 | ||
48925e37 | 544 | tot_sgs += skb_vnet_hdr(skb)->num_sg; |
ed79bab8 | 545 | dev_kfree_skb_any(skb); |
296f96fc | 546 | } |
48925e37 | 547 | return tot_sgs; |
296f96fc RR |
548 | } |
549 | ||
99ffc696 | 550 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 551 | { |
b3f24698 | 552 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
296f96fc | 553 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
296f96fc | 554 | |
e174961c | 555 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 556 | |
296f96fc | 557 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 558 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
55508d60 | 559 | hdr->hdr.csum_start = skb_checksum_start_offset(skb); |
b3f24698 | 560 | hdr->hdr.csum_offset = skb->csum_offset; |
296f96fc | 561 | } else { |
b3f24698 RR |
562 | hdr->hdr.flags = 0; |
563 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
564 | } |
565 | ||
566 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
567 | hdr->hdr.hdr_len = skb_headlen(skb); |
568 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 569 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 570 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 571 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 572 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 573 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 574 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
575 | else |
576 | BUG(); | |
34a48579 | 577 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 578 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 579 | } else { |
b3f24698 RR |
580 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
581 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
582 | } |
583 | ||
b3f24698 | 584 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 MM |
585 | |
586 | /* Encode metadata header at front. */ | |
587 | if (vi->mergeable_rx_bufs) | |
5e01d2f9 | 588 | sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr); |
3f2c31d9 | 589 | else |
5e01d2f9 | 590 | sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr); |
3f2c31d9 | 591 | |
5e01d2f9 | 592 | hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1; |
1756ac3d | 593 | return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg, |
5e01d2f9 | 594 | 0, skb); |
11a3a154 RR |
595 | } |
596 | ||
424efe9c | 597 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
598 | { |
599 | struct virtnet_info *vi = netdev_priv(dev); | |
48925e37 | 600 | int capacity; |
2cb9c6ba | 601 | |
2cb9c6ba RR |
602 | /* Free up any pending old buffers before queueing new ones. */ |
603 | free_old_xmit_skbs(vi); | |
99ffc696 | 604 | |
03f191ba | 605 | /* Try to transmit */ |
48925e37 RR |
606 | capacity = xmit_skb(vi, skb); |
607 | ||
608 | /* This can happen with OOM and indirect buffers. */ | |
609 | if (unlikely(capacity < 0)) { | |
58eba97d RR |
610 | if (net_ratelimit()) { |
611 | if (likely(capacity == -ENOMEM)) { | |
612 | dev_warn(&dev->dev, | |
613 | "TX queue failure: out of memory\n"); | |
614 | } else { | |
615 | dev->stats.tx_fifo_errors++; | |
616 | dev_warn(&dev->dev, | |
617 | "Unexpected TX queue failure: %d\n", | |
618 | capacity); | |
619 | } | |
48925e37 | 620 | } |
58eba97d RR |
621 | dev->stats.tx_dropped++; |
622 | kfree_skb(skb); | |
623 | return NETDEV_TX_OK; | |
296f96fc | 624 | } |
1915a712 | 625 | virtqueue_kick(vi->svq); |
03f191ba | 626 | |
48925e37 RR |
627 | /* Don't wait up for transmitted skbs to be freed. */ |
628 | skb_orphan(skb); | |
629 | nf_reset(skb); | |
630 | ||
631 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
632 | * before it gets out of hand. Naturally, this wastes entries. */ | |
633 | if (capacity < 2+MAX_SKB_FRAGS) { | |
634 | netif_stop_queue(dev); | |
7a66f784 | 635 | if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) { |
48925e37 RR |
636 | /* More just got used, free them then recheck. */ |
637 | capacity += free_old_xmit_skbs(vi); | |
638 | if (capacity >= 2+MAX_SKB_FRAGS) { | |
639 | netif_start_queue(dev); | |
1915a712 | 640 | virtqueue_disable_cb(vi->svq); |
48925e37 RR |
641 | } |
642 | } | |
99ffc696 | 643 | } |
48925e37 RR |
644 | |
645 | return NETDEV_TX_OK; | |
296f96fc RR |
646 | } |
647 | ||
9c46f6d4 AW |
648 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
649 | { | |
650 | struct virtnet_info *vi = netdev_priv(dev); | |
651 | struct virtio_device *vdev = vi->vdev; | |
652 | int ret; | |
653 | ||
654 | ret = eth_mac_addr(dev, p); | |
655 | if (ret) | |
656 | return ret; | |
657 | ||
62994b2d AW |
658 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
659 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), | |
660 | dev->dev_addr, dev->addr_len); | |
9c46f6d4 AW |
661 | |
662 | return 0; | |
663 | } | |
664 | ||
3fa2a1df | 665 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
666 | struct rtnl_link_stats64 *tot) | |
667 | { | |
668 | struct virtnet_info *vi = netdev_priv(dev); | |
669 | int cpu; | |
670 | unsigned int start; | |
671 | ||
672 | for_each_possible_cpu(cpu) { | |
673 | struct virtnet_stats __percpu *stats | |
674 | = per_cpu_ptr(vi->stats, cpu); | |
675 | u64 tpackets, tbytes, rpackets, rbytes; | |
676 | ||
677 | do { | |
678 | start = u64_stats_fetch_begin(&stats->syncp); | |
679 | tpackets = stats->tx_packets; | |
680 | tbytes = stats->tx_bytes; | |
681 | rpackets = stats->rx_packets; | |
682 | rbytes = stats->rx_bytes; | |
683 | } while (u64_stats_fetch_retry(&stats->syncp, start)); | |
684 | ||
685 | tot->rx_packets += rpackets; | |
686 | tot->tx_packets += tpackets; | |
687 | tot->rx_bytes += rbytes; | |
688 | tot->tx_bytes += tbytes; | |
689 | } | |
690 | ||
691 | tot->tx_dropped = dev->stats.tx_dropped; | |
692 | tot->rx_dropped = dev->stats.rx_dropped; | |
693 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
694 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
695 | ||
696 | return tot; | |
697 | } | |
698 | ||
da74e89d AS |
699 | #ifdef CONFIG_NET_POLL_CONTROLLER |
700 | static void virtnet_netpoll(struct net_device *dev) | |
701 | { | |
702 | struct virtnet_info *vi = netdev_priv(dev); | |
703 | ||
704 | napi_schedule(&vi->napi); | |
705 | } | |
706 | #endif | |
707 | ||
296f96fc RR |
708 | static int virtnet_open(struct net_device *dev) |
709 | { | |
710 | struct virtnet_info *vi = netdev_priv(dev); | |
711 | ||
3e9d08ec | 712 | virtnet_napi_enable(vi); |
296f96fc RR |
713 | return 0; |
714 | } | |
715 | ||
2a41f71d AW |
716 | /* |
717 | * Send command via the control virtqueue and check status. Commands | |
718 | * supported by the hypervisor, as indicated by feature bits, should | |
719 | * never fail unless improperly formated. | |
720 | */ | |
721 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
722 | struct scatterlist *data, int out, int in) | |
723 | { | |
23e258e1 | 724 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
2a41f71d AW |
725 | struct virtio_net_ctrl_hdr ctrl; |
726 | virtio_net_ctrl_ack status = ~0; | |
727 | unsigned int tmp; | |
23e258e1 | 728 | int i; |
2a41f71d | 729 | |
0ee904c3 AB |
730 | /* Caller should know better */ |
731 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || | |
732 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); | |
2a41f71d AW |
733 | |
734 | out++; /* Add header */ | |
735 | in++; /* Add return status */ | |
736 | ||
737 | ctrl.class = class; | |
738 | ctrl.cmd = cmd; | |
739 | ||
740 | sg_init_table(sg, out + in); | |
741 | ||
742 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); | |
23e258e1 AW |
743 | for_each_sg(data, s, out + in - 2, i) |
744 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); | |
2a41f71d AW |
745 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
746 | ||
1915a712 | 747 | BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi) < 0); |
2a41f71d | 748 | |
1915a712 | 749 | virtqueue_kick(vi->cvq); |
2a41f71d AW |
750 | |
751 | /* | |
752 | * Spin for a response, the kick causes an ioport write, trapping | |
753 | * into the hypervisor, so the request should be handled immediately. | |
754 | */ | |
1915a712 | 755 | while (!virtqueue_get_buf(vi->cvq, &tmp)) |
2a41f71d AW |
756 | cpu_relax(); |
757 | ||
758 | return status == VIRTIO_NET_OK; | |
759 | } | |
760 | ||
296f96fc RR |
761 | static int virtnet_close(struct net_device *dev) |
762 | { | |
763 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc RR |
764 | |
765 | napi_disable(&vi->napi); | |
766 | ||
296f96fc RR |
767 | return 0; |
768 | } | |
769 | ||
2af7698e AW |
770 | static void virtnet_set_rx_mode(struct net_device *dev) |
771 | { | |
772 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 773 | struct scatterlist sg[2]; |
2af7698e | 774 | u8 promisc, allmulti; |
f565a7c2 | 775 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 776 | struct netdev_hw_addr *ha; |
32e7bfc4 | 777 | int uc_count; |
4cd24eaf | 778 | int mc_count; |
f565a7c2 AW |
779 | void *buf; |
780 | int i; | |
2af7698e AW |
781 | |
782 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
783 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
784 | return; | |
785 | ||
f565a7c2 AW |
786 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
787 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 788 | |
23e258e1 | 789 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
790 | |
791 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
792 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f565a7c2 | 793 | sg, 1, 0)) |
2af7698e AW |
794 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
795 | promisc ? "en" : "dis"); | |
796 | ||
23e258e1 | 797 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
798 | |
799 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
800 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f565a7c2 | 801 | sg, 1, 0)) |
2af7698e AW |
802 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
803 | allmulti ? "en" : "dis"); | |
f565a7c2 | 804 | |
32e7bfc4 | 805 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 806 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 807 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
808 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
809 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
810 | mac_data = buf; | |
f565a7c2 AW |
811 | if (!buf) { |
812 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); | |
813 | return; | |
814 | } | |
815 | ||
23e258e1 AW |
816 | sg_init_table(sg, 2); |
817 | ||
f565a7c2 | 818 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 819 | mac_data->entries = uc_count; |
ccffad25 | 820 | i = 0; |
32e7bfc4 | 821 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 822 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
823 | |
824 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 825 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
826 | |
827 | /* multicast list and count fill the end */ | |
32e7bfc4 | 828 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 829 | |
4cd24eaf | 830 | mac_data->entries = mc_count; |
567ec874 | 831 | i = 0; |
22bedad3 JP |
832 | netdev_for_each_mc_addr(ha, dev) |
833 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
834 | |
835 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 836 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
837 | |
838 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
839 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
840 | sg, 2, 0)) | |
841 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); | |
842 | ||
843 | kfree(buf); | |
2af7698e AW |
844 | } |
845 | ||
1824a989 | 846 | static void virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
847 | { |
848 | struct virtnet_info *vi = netdev_priv(dev); | |
849 | struct scatterlist sg; | |
850 | ||
23e258e1 | 851 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
852 | |
853 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
854 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) | |
855 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); | |
856 | } | |
857 | ||
1824a989 | 858 | static void virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
859 | { |
860 | struct virtnet_info *vi = netdev_priv(dev); | |
861 | struct scatterlist sg; | |
862 | ||
23e258e1 | 863 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
864 | |
865 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
866 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) | |
867 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); | |
868 | } | |
869 | ||
0fc0b732 | 870 | static const struct ethtool_ops virtnet_ethtool_ops = { |
9f4d26d0 | 871 | .get_link = ethtool_op_get_link, |
a9ea3fc6 HX |
872 | }; |
873 | ||
39da5814 MM |
874 | #define MIN_MTU 68 |
875 | #define MAX_MTU 65535 | |
876 | ||
877 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
878 | { | |
879 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
880 | return -EINVAL; | |
881 | dev->mtu = new_mtu; | |
882 | return 0; | |
883 | } | |
884 | ||
76288b4e SH |
885 | static const struct net_device_ops virtnet_netdev = { |
886 | .ndo_open = virtnet_open, | |
887 | .ndo_stop = virtnet_close, | |
888 | .ndo_start_xmit = start_xmit, | |
889 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 890 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 891 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 892 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 893 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
894 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
895 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
896 | #ifdef CONFIG_NET_POLL_CONTROLLER |
897 | .ndo_poll_controller = virtnet_netpoll, | |
898 | #endif | |
899 | }; | |
900 | ||
9f4d26d0 MM |
901 | static void virtnet_update_status(struct virtnet_info *vi) |
902 | { | |
903 | u16 v; | |
904 | ||
905 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) | |
906 | return; | |
907 | ||
908 | vi->vdev->config->get(vi->vdev, | |
909 | offsetof(struct virtio_net_config, status), | |
910 | &v, sizeof(v)); | |
911 | ||
912 | /* Ignore unknown (future) status bits */ | |
913 | v &= VIRTIO_NET_S_LINK_UP; | |
914 | ||
915 | if (vi->status == v) | |
916 | return; | |
917 | ||
918 | vi->status = v; | |
919 | ||
920 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
921 | netif_carrier_on(vi->dev); | |
922 | netif_wake_queue(vi->dev); | |
923 | } else { | |
924 | netif_carrier_off(vi->dev); | |
925 | netif_stop_queue(vi->dev); | |
926 | } | |
927 | } | |
928 | ||
929 | static void virtnet_config_changed(struct virtio_device *vdev) | |
930 | { | |
931 | struct virtnet_info *vi = vdev->priv; | |
932 | ||
933 | virtnet_update_status(vi); | |
934 | } | |
935 | ||
296f96fc RR |
936 | static int virtnet_probe(struct virtio_device *vdev) |
937 | { | |
938 | int err; | |
296f96fc RR |
939 | struct net_device *dev; |
940 | struct virtnet_info *vi; | |
d2a7ddda MT |
941 | struct virtqueue *vqs[3]; |
942 | vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; | |
943 | const char *names[] = { "input", "output", "control" }; | |
944 | int nvqs; | |
296f96fc RR |
945 | |
946 | /* Allocate ourselves a network device with room for our info */ | |
947 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
948 | if (!dev) | |
949 | return -ENOMEM; | |
950 | ||
951 | /* Set up network device as normal. */ | |
76288b4e | 952 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 953 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 954 | |
a9ea3fc6 | 955 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
956 | SET_NETDEV_DEV(dev, &vdev->dev); |
957 | ||
958 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 959 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 960 | /* This opens up the world of extra features. */ |
98e778c9 MM |
961 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
962 | if (csum) | |
963 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
964 | ||
965 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
966 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO | |
34a48579 RR |
967 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
968 | } | |
5539ae96 | 969 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
970 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
971 | dev->hw_features |= NETIF_F_TSO; | |
972 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
973 | dev->hw_features |= NETIF_F_TSO6; | |
974 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
975 | dev->hw_features |= NETIF_F_TSO_ECN; | |
976 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) | |
977 | dev->hw_features |= NETIF_F_UFO; | |
978 | ||
979 | if (gso) | |
980 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); | |
981 | /* (!csum && gso) case will be fixed by register_netdev() */ | |
296f96fc RR |
982 | } |
983 | ||
984 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
c45a6816 | 985 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
a586d4f6 RR |
986 | vdev->config->get(vdev, |
987 | offsetof(struct virtio_net_config, mac), | |
988 | dev->dev_addr, dev->addr_len); | |
62994b2d | 989 | } else |
296f96fc RR |
990 | random_ether_addr(dev->dev_addr); |
991 | ||
992 | /* Set up our device-specific information */ | |
993 | vi = netdev_priv(dev); | |
6c0cd7c0 | 994 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
995 | vi->dev = dev; |
996 | vi->vdev = vdev; | |
d9d5dcc8 | 997 | vdev->priv = vi; |
fb6813f4 | 998 | vi->pages = NULL; |
3fa2a1df | 999 | vi->stats = alloc_percpu(struct virtnet_stats); |
1000 | err = -ENOMEM; | |
1001 | if (vi->stats == NULL) | |
1002 | goto free; | |
1003 | ||
3161e453 | 1004 | INIT_DELAYED_WORK(&vi->refill, refill_work); |
5e01d2f9 MT |
1005 | sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg)); |
1006 | sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg)); | |
296f96fc | 1007 | |
97402b96 | 1008 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1009 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1010 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
1011 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
97402b96 HX |
1012 | vi->big_packets = true; |
1013 | ||
3f2c31d9 MM |
1014 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1015 | vi->mergeable_rx_bufs = true; | |
1016 | ||
d2a7ddda MT |
1017 | /* We expect two virtqueues, receive then send, |
1018 | * and optionally control. */ | |
1019 | nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; | |
1020 | ||
1021 | err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names); | |
1022 | if (err) | |
3fa2a1df | 1023 | goto free_stats; |
296f96fc | 1024 | |
d2a7ddda MT |
1025 | vi->rvq = vqs[0]; |
1026 | vi->svq = vqs[1]; | |
296f96fc | 1027 | |
2a41f71d | 1028 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { |
d2a7ddda | 1029 | vi->cvq = vqs[2]; |
0bde9569 AW |
1030 | |
1031 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) | |
1032 | dev->features |= NETIF_F_HW_VLAN_FILTER; | |
2a41f71d AW |
1033 | } |
1034 | ||
296f96fc RR |
1035 | err = register_netdev(dev); |
1036 | if (err) { | |
1037 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1038 | goto free_vqs; |
296f96fc | 1039 | } |
b3369c1f RR |
1040 | |
1041 | /* Last of all, set up some receive buffers. */ | |
3161e453 | 1042 | try_fill_recv(vi, GFP_KERNEL); |
b3369c1f RR |
1043 | |
1044 | /* If we didn't even get one input buffer, we're useless. */ | |
1045 | if (vi->num == 0) { | |
1046 | err = -ENOMEM; | |
1047 | goto unregister; | |
1048 | } | |
1049 | ||
167c25e4 JW |
1050 | /* Assume link up if device can't report link status, |
1051 | otherwise get link status from config. */ | |
1052 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1053 | netif_carrier_off(dev); | |
1054 | virtnet_update_status(vi); | |
1055 | } else { | |
1056 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1057 | netif_carrier_on(dev); | |
1058 | } | |
9f4d26d0 | 1059 | |
296f96fc | 1060 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
1061 | return 0; |
1062 | ||
b3369c1f RR |
1063 | unregister: |
1064 | unregister_netdev(dev); | |
3161e453 | 1065 | cancel_delayed_work_sync(&vi->refill); |
d2a7ddda MT |
1066 | free_vqs: |
1067 | vdev->config->del_vqs(vdev); | |
3fa2a1df | 1068 | free_stats: |
1069 | free_percpu(vi->stats); | |
296f96fc RR |
1070 | free: |
1071 | free_netdev(dev); | |
1072 | return err; | |
1073 | } | |
1074 | ||
9ab86bbc SM |
1075 | static void free_unused_bufs(struct virtnet_info *vi) |
1076 | { | |
1077 | void *buf; | |
830a8a97 | 1078 | while (1) { |
1915a712 | 1079 | buf = virtqueue_detach_unused_buf(vi->svq); |
830a8a97 SM |
1080 | if (!buf) |
1081 | break; | |
1082 | dev_kfree_skb(buf); | |
1083 | } | |
9ab86bbc | 1084 | while (1) { |
1915a712 | 1085 | buf = virtqueue_detach_unused_buf(vi->rvq); |
9ab86bbc SM |
1086 | if (!buf) |
1087 | break; | |
1088 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
1089 | give_pages(vi, buf); | |
1090 | else | |
1091 | dev_kfree_skb(buf); | |
1092 | --vi->num; | |
1093 | } | |
1094 | BUG_ON(vi->num != 0); | |
1095 | } | |
1096 | ||
3d1285be | 1097 | static void __devexit virtnet_remove(struct virtio_device *vdev) |
296f96fc | 1098 | { |
74b2553f | 1099 | struct virtnet_info *vi = vdev->priv; |
b3369c1f | 1100 | |
6e5aa7ef RR |
1101 | /* Stop all the virtqueues. */ |
1102 | vdev->config->reset(vdev); | |
1103 | ||
b3369c1f | 1104 | |
74b2553f | 1105 | unregister_netdev(vi->dev); |
3161e453 | 1106 | cancel_delayed_work_sync(&vi->refill); |
830a8a97 SM |
1107 | |
1108 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1109 | free_unused_bufs(vi); |
fb6813f4 | 1110 | |
d2a7ddda MT |
1111 | vdev->config->del_vqs(vi->vdev); |
1112 | ||
fb6813f4 RR |
1113 | while (vi->pages) |
1114 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); | |
1115 | ||
2e66f55b | 1116 | free_percpu(vi->stats); |
74b2553f | 1117 | free_netdev(vi->dev); |
296f96fc RR |
1118 | } |
1119 | ||
1120 | static struct virtio_device_id id_table[] = { | |
1121 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1122 | { 0 }, | |
1123 | }; | |
1124 | ||
c45a6816 | 1125 | static unsigned int features[] = { |
5e4fe5c4 MM |
1126 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1127 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1128 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1129 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1130 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1131 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1132 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
c45a6816 RR |
1133 | }; |
1134 | ||
22402529 | 1135 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1136 | .feature_table = features, |
1137 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1138 | .driver.name = KBUILD_MODNAME, |
1139 | .driver.owner = THIS_MODULE, | |
1140 | .id_table = id_table, | |
1141 | .probe = virtnet_probe, | |
1142 | .remove = __devexit_p(virtnet_remove), | |
9f4d26d0 | 1143 | .config_changed = virtnet_config_changed, |
296f96fc RR |
1144 | }; |
1145 | ||
1146 | static int __init init(void) | |
1147 | { | |
22402529 | 1148 | return register_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1149 | } |
1150 | ||
1151 | static void __exit fini(void) | |
1152 | { | |
22402529 | 1153 | unregister_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1154 | } |
1155 | module_init(init); | |
1156 | module_exit(fini); | |
1157 | ||
1158 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1159 | MODULE_DESCRIPTION("Virtio network driver"); | |
1160 | MODULE_LICENSE("GPL"); |