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 | ||
eb939922 | 33 | static bool csum = true, gso = true; |
34a48579 RR |
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 |
66846048 | 42 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 43 | |
3fa2a1df | 44 | struct virtnet_stats { |
83a27052 ED |
45 | struct u64_stats_sync tx_syncp; |
46 | struct u64_stats_sync rx_syncp; | |
3fa2a1df | 47 | u64 tx_bytes; |
48 | u64 tx_packets; | |
49 | ||
50 | u64 rx_bytes; | |
51 | u64 rx_packets; | |
52 | }; | |
53 | ||
5e01d2f9 | 54 | struct virtnet_info { |
296f96fc | 55 | struct virtio_device *vdev; |
2a41f71d | 56 | struct virtqueue *rvq, *svq, *cvq; |
296f96fc RR |
57 | struct net_device *dev; |
58 | struct napi_struct napi; | |
9f4d26d0 | 59 | unsigned int status; |
296f96fc RR |
60 | |
61 | /* Number of input buffers, and max we've ever had. */ | |
62 | unsigned int num, max; | |
63 | ||
97402b96 HX |
64 | /* I like... big packets and I cannot lie! */ |
65 | bool big_packets; | |
66 | ||
3f2c31d9 MM |
67 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
68 | bool mergeable_rx_bufs; | |
69 | ||
586d17c5 JW |
70 | /* enable config space updates */ |
71 | bool config_enable; | |
72 | ||
3fa2a1df | 73 | /* Active statistics */ |
74 | struct virtnet_stats __percpu *stats; | |
75 | ||
3161e453 RR |
76 | /* Work struct for refilling if we run low on memory. */ |
77 | struct delayed_work refill; | |
78 | ||
586d17c5 JW |
79 | /* Work struct for config space updates */ |
80 | struct work_struct config_work; | |
81 | ||
82 | /* Lock for config space updates */ | |
83 | struct mutex config_lock; | |
84 | ||
fb6813f4 RR |
85 | /* Chain pages by the private ptr. */ |
86 | struct page *pages; | |
5e01d2f9 MT |
87 | |
88 | /* fragments + linear part + virtio header */ | |
89 | struct scatterlist rx_sg[MAX_SKB_FRAGS + 2]; | |
90 | struct scatterlist tx_sg[MAX_SKB_FRAGS + 2]; | |
296f96fc RR |
91 | }; |
92 | ||
b3f24698 RR |
93 | struct skb_vnet_hdr { |
94 | union { | |
95 | struct virtio_net_hdr hdr; | |
96 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
97 | }; | |
48925e37 | 98 | unsigned int num_sg; |
b3f24698 RR |
99 | }; |
100 | ||
9ab86bbc SM |
101 | struct padded_vnet_hdr { |
102 | struct virtio_net_hdr hdr; | |
103 | /* | |
104 | * virtio_net_hdr should be in a separated sg buffer because of a | |
105 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
106 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
107 | */ | |
108 | char padding[6]; | |
109 | }; | |
110 | ||
b3f24698 | 111 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 112 | { |
b3f24698 | 113 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
114 | } |
115 | ||
9ab86bbc SM |
116 | /* |
117 | * private is used to chain pages for big packets, put the whole | |
118 | * most recent used list in the beginning for reuse | |
119 | */ | |
120 | static void give_pages(struct virtnet_info *vi, struct page *page) | |
0a888fd1 | 121 | { |
9ab86bbc | 122 | struct page *end; |
0a888fd1 | 123 | |
9ab86bbc SM |
124 | /* Find end of list, sew whole thing into vi->pages. */ |
125 | for (end = page; end->private; end = (struct page *)end->private); | |
126 | end->private = (unsigned long)vi->pages; | |
127 | vi->pages = page; | |
0a888fd1 MM |
128 | } |
129 | ||
fb6813f4 RR |
130 | static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) |
131 | { | |
132 | struct page *p = vi->pages; | |
133 | ||
9ab86bbc | 134 | if (p) { |
fb6813f4 | 135 | vi->pages = (struct page *)p->private; |
9ab86bbc SM |
136 | /* clear private here, it is used to chain pages */ |
137 | p->private = 0; | |
138 | } else | |
fb6813f4 RR |
139 | p = alloc_page(gfp_mask); |
140 | return p; | |
141 | } | |
142 | ||
2cb9c6ba | 143 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 144 | { |
2cb9c6ba | 145 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 146 | |
2cb9c6ba | 147 | /* Suppress further interrupts. */ |
1915a712 | 148 | virtqueue_disable_cb(svq); |
11a3a154 | 149 | |
363f1514 | 150 | /* We were probably waiting for more output buffers. */ |
296f96fc | 151 | netif_wake_queue(vi->dev); |
296f96fc RR |
152 | } |
153 | ||
9ab86bbc SM |
154 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
155 | unsigned int offset, unsigned int *len) | |
296f96fc | 156 | { |
8a59a7b9 | 157 | int size = min((unsigned)PAGE_SIZE - offset, *len); |
9ab86bbc | 158 | int i = skb_shinfo(skb)->nr_frags; |
9ab86bbc | 159 | |
8a59a7b9 | 160 | __skb_fill_page_desc(skb, i, page, offset, size); |
9ab86bbc | 161 | |
8a59a7b9 KK |
162 | skb->data_len += size; |
163 | skb->len += size; | |
4b727361 | 164 | skb->truesize += PAGE_SIZE; |
9ab86bbc | 165 | skb_shinfo(skb)->nr_frags++; |
8a59a7b9 | 166 | *len -= size; |
9ab86bbc | 167 | } |
23cde76d | 168 | |
3464645a | 169 | /* Called from bottom half context */ |
9ab86bbc SM |
170 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
171 | struct page *page, unsigned int len) | |
172 | { | |
173 | struct sk_buff *skb; | |
174 | struct skb_vnet_hdr *hdr; | |
175 | unsigned int copy, hdr_len, offset; | |
176 | char *p; | |
fb6813f4 | 177 | |
9ab86bbc | 178 | p = page_address(page); |
3f2c31d9 | 179 | |
9ab86bbc SM |
180 | /* copy small packet so we can reuse these pages for small data */ |
181 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
182 | if (unlikely(!skb)) | |
183 | return NULL; | |
3f2c31d9 | 184 | |
9ab86bbc | 185 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 186 | |
9ab86bbc SM |
187 | if (vi->mergeable_rx_bufs) { |
188 | hdr_len = sizeof hdr->mhdr; | |
189 | offset = hdr_len; | |
190 | } else { | |
191 | hdr_len = sizeof hdr->hdr; | |
192 | offset = sizeof(struct padded_vnet_hdr); | |
193 | } | |
3f2c31d9 | 194 | |
9ab86bbc | 195 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 196 | |
9ab86bbc SM |
197 | len -= hdr_len; |
198 | p += offset; | |
3f2c31d9 | 199 | |
9ab86bbc SM |
200 | copy = len; |
201 | if (copy > skb_tailroom(skb)) | |
202 | copy = skb_tailroom(skb); | |
203 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 204 | |
9ab86bbc SM |
205 | len -= copy; |
206 | offset += copy; | |
3f2c31d9 | 207 | |
e878d78b SL |
208 | /* |
209 | * Verify that we can indeed put this data into a skb. | |
210 | * This is here to handle cases when the device erroneously | |
211 | * tries to receive more than is possible. This is usually | |
212 | * the case of a broken device. | |
213 | */ | |
214 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 215 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
216 | dev_kfree_skb(skb); |
217 | return NULL; | |
218 | } | |
219 | ||
9ab86bbc SM |
220 | while (len) { |
221 | set_skb_frag(skb, page, offset, &len); | |
222 | page = (struct page *)page->private; | |
223 | offset = 0; | |
224 | } | |
3f2c31d9 | 225 | |
9ab86bbc SM |
226 | if (page) |
227 | give_pages(vi, page); | |
3f2c31d9 | 228 | |
9ab86bbc SM |
229 | return skb; |
230 | } | |
3f2c31d9 | 231 | |
9ab86bbc SM |
232 | static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb) |
233 | { | |
234 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); | |
235 | struct page *page; | |
236 | int num_buf, i, len; | |
237 | ||
238 | num_buf = hdr->mhdr.num_buffers; | |
239 | while (--num_buf) { | |
240 | i = skb_shinfo(skb)->nr_frags; | |
241 | if (i >= MAX_SKB_FRAGS) { | |
242 | pr_debug("%s: packet too long\n", skb->dev->name); | |
243 | skb->dev->stats.rx_length_errors++; | |
244 | return -EINVAL; | |
245 | } | |
1915a712 | 246 | page = virtqueue_get_buf(vi->rvq, &len); |
9ab86bbc SM |
247 | if (!page) { |
248 | pr_debug("%s: rx error: %d buffers missing\n", | |
249 | skb->dev->name, hdr->mhdr.num_buffers); | |
250 | skb->dev->stats.rx_length_errors++; | |
251 | return -EINVAL; | |
3f2c31d9 | 252 | } |
3fa2a1df | 253 | |
9ab86bbc SM |
254 | if (len > PAGE_SIZE) |
255 | len = PAGE_SIZE; | |
256 | ||
257 | set_skb_frag(skb, page, 0, &len); | |
258 | ||
259 | --vi->num; | |
260 | } | |
261 | return 0; | |
262 | } | |
263 | ||
264 | static void receive_buf(struct net_device *dev, void *buf, unsigned int len) | |
265 | { | |
266 | struct virtnet_info *vi = netdev_priv(dev); | |
58472a76 | 267 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc SM |
268 | struct sk_buff *skb; |
269 | struct page *page; | |
270 | struct skb_vnet_hdr *hdr; | |
3f2c31d9 | 271 | |
9ab86bbc SM |
272 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
273 | pr_debug("%s: short packet %i\n", dev->name, len); | |
274 | dev->stats.rx_length_errors++; | |
275 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
276 | give_pages(vi, buf); | |
277 | else | |
278 | dev_kfree_skb(buf); | |
279 | return; | |
280 | } | |
3f2c31d9 | 281 | |
9ab86bbc SM |
282 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
283 | skb = buf; | |
284 | len -= sizeof(struct virtio_net_hdr); | |
285 | skb_trim(skb, len); | |
286 | } else { | |
287 | page = buf; | |
288 | skb = page_to_skb(vi, page, len); | |
289 | if (unlikely(!skb)) { | |
3f2c31d9 | 290 | dev->stats.rx_dropped++; |
9ab86bbc SM |
291 | give_pages(vi, page); |
292 | return; | |
3f2c31d9 | 293 | } |
9ab86bbc SM |
294 | if (vi->mergeable_rx_bufs) |
295 | if (receive_mergeable(vi, skb)) { | |
296 | dev_kfree_skb(skb); | |
297 | return; | |
298 | } | |
97402b96 | 299 | } |
3f2c31d9 | 300 | |
9ab86bbc | 301 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 302 | |
83a27052 | 303 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 304 | stats->rx_bytes += skb->len; |
305 | stats->rx_packets++; | |
83a27052 | 306 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 307 | |
b3f24698 | 308 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 309 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
310 | if (!skb_partial_csum_set(skb, |
311 | hdr->hdr.csum_start, | |
312 | hdr->hdr.csum_offset)) | |
296f96fc | 313 | goto frame_err; |
10a8d94a JW |
314 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
315 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
316 | } |
317 | ||
23cde76d MM |
318 | skb->protocol = eth_type_trans(skb, dev); |
319 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
320 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
321 | ||
b3f24698 | 322 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 323 | pr_debug("GSO!\n"); |
b3f24698 | 324 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
325 | case VIRTIO_NET_HDR_GSO_TCPV4: |
326 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
327 | break; | |
296f96fc RR |
328 | case VIRTIO_NET_HDR_GSO_UDP: |
329 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
330 | break; | |
331 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
332 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
333 | break; | |
334 | default: | |
be443899 AW |
335 | net_warn_ratelimited("%s: bad gso type %u.\n", |
336 | dev->name, hdr->hdr.gso_type); | |
296f96fc RR |
337 | goto frame_err; |
338 | } | |
339 | ||
b3f24698 | 340 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
34a48579 RR |
341 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
342 | ||
b3f24698 | 343 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc | 344 | if (skb_shinfo(skb)->gso_size == 0) { |
be443899 | 345 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
296f96fc RR |
346 | goto frame_err; |
347 | } | |
348 | ||
349 | /* Header must be checked, and gso_segs computed. */ | |
350 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
351 | skb_shinfo(skb)->gso_segs = 0; | |
352 | } | |
353 | ||
354 | netif_receive_skb(skb); | |
355 | return; | |
356 | ||
357 | frame_err: | |
358 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
359 | dev_kfree_skb(skb); |
360 | } | |
361 | ||
9ab86bbc | 362 | static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp) |
296f96fc RR |
363 | { |
364 | struct sk_buff *skb; | |
9ab86bbc | 365 | struct skb_vnet_hdr *hdr; |
9ab86bbc | 366 | int err; |
3f2c31d9 | 367 | |
3464645a | 368 | skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp); |
9ab86bbc SM |
369 | if (unlikely(!skb)) |
370 | return -ENOMEM; | |
296f96fc | 371 | |
9ab86bbc | 372 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 373 | |
9ab86bbc | 374 | hdr = skb_vnet_hdr(skb); |
5e01d2f9 | 375 | sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr); |
97402b96 | 376 | |
5e01d2f9 | 377 | skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len); |
97402b96 | 378 | |
f96fde41 | 379 | err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp); |
9ab86bbc SM |
380 | if (err < 0) |
381 | dev_kfree_skb(skb); | |
97402b96 | 382 | |
9ab86bbc SM |
383 | return err; |
384 | } | |
97402b96 | 385 | |
9ab86bbc SM |
386 | static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp) |
387 | { | |
9ab86bbc SM |
388 | struct page *first, *list = NULL; |
389 | char *p; | |
390 | int i, err, offset; | |
391 | ||
5e01d2f9 | 392 | /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc SM |
393 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
394 | first = get_a_page(vi, gfp); | |
395 | if (!first) { | |
396 | if (list) | |
397 | give_pages(vi, list); | |
398 | return -ENOMEM; | |
97402b96 | 399 | } |
5e01d2f9 | 400 | sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 401 | |
9ab86bbc SM |
402 | /* chain new page in list head to match sg */ |
403 | first->private = (unsigned long)list; | |
404 | list = first; | |
405 | } | |
296f96fc | 406 | |
9ab86bbc SM |
407 | first = get_a_page(vi, gfp); |
408 | if (!first) { | |
409 | give_pages(vi, list); | |
410 | return -ENOMEM; | |
411 | } | |
412 | p = page_address(first); | |
413 | ||
5e01d2f9 MT |
414 | /* vi->rx_sg[0], vi->rx_sg[1] share the same page */ |
415 | /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */ | |
416 | sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr)); | |
9ab86bbc | 417 | |
5e01d2f9 | 418 | /* vi->rx_sg[1] for data packet, from offset */ |
9ab86bbc | 419 | offset = sizeof(struct padded_vnet_hdr); |
5e01d2f9 | 420 | sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
421 | |
422 | /* chain first in list head */ | |
423 | first->private = (unsigned long)list; | |
f96fde41 RR |
424 | err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2, |
425 | first, gfp); | |
9ab86bbc SM |
426 | if (err < 0) |
427 | give_pages(vi, first); | |
428 | ||
429 | return err; | |
296f96fc RR |
430 | } |
431 | ||
9ab86bbc | 432 | static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp) |
3f2c31d9 | 433 | { |
9ab86bbc | 434 | struct page *page; |
3f2c31d9 | 435 | int err; |
3f2c31d9 | 436 | |
9ab86bbc SM |
437 | page = get_a_page(vi, gfp); |
438 | if (!page) | |
439 | return -ENOMEM; | |
3f2c31d9 | 440 | |
5e01d2f9 | 441 | sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE); |
3f2c31d9 | 442 | |
f96fde41 | 443 | err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp); |
9ab86bbc SM |
444 | if (err < 0) |
445 | give_pages(vi, page); | |
3f2c31d9 | 446 | |
9ab86bbc SM |
447 | return err; |
448 | } | |
3f2c31d9 | 449 | |
b2baed69 RR |
450 | /* |
451 | * Returns false if we couldn't fill entirely (OOM). | |
452 | * | |
453 | * Normally run in the receive path, but can also be run from ndo_open | |
454 | * before we're receiving packets, or from refill_work which is | |
455 | * careful to disable receiving (using napi_disable). | |
456 | */ | |
9ab86bbc SM |
457 | static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) |
458 | { | |
459 | int err; | |
1788f495 | 460 | bool oom; |
3f2c31d9 | 461 | |
9ab86bbc SM |
462 | do { |
463 | if (vi->mergeable_rx_bufs) | |
464 | err = add_recvbuf_mergeable(vi, gfp); | |
465 | else if (vi->big_packets) | |
466 | err = add_recvbuf_big(vi, gfp); | |
467 | else | |
468 | err = add_recvbuf_small(vi, gfp); | |
3f2c31d9 | 469 | |
1788f495 MT |
470 | oom = err == -ENOMEM; |
471 | if (err < 0) | |
3f2c31d9 | 472 | break; |
9ab86bbc | 473 | ++vi->num; |
0aea51c3 | 474 | } while (err > 0); |
3f2c31d9 MM |
475 | if (unlikely(vi->num > vi->max)) |
476 | vi->max = vi->num; | |
1915a712 | 477 | virtqueue_kick(vi->rvq); |
3161e453 | 478 | return !oom; |
3f2c31d9 MM |
479 | } |
480 | ||
18445c4d | 481 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
482 | { |
483 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d | 484 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
288379f0 | 485 | if (napi_schedule_prep(&vi->napi)) { |
1915a712 | 486 | virtqueue_disable_cb(rvq); |
288379f0 | 487 | __napi_schedule(&vi->napi); |
18445c4d | 488 | } |
296f96fc RR |
489 | } |
490 | ||
3e9d08ec BR |
491 | static void virtnet_napi_enable(struct virtnet_info *vi) |
492 | { | |
493 | napi_enable(&vi->napi); | |
494 | ||
495 | /* If all buffers were filled by other side before we napi_enabled, we | |
496 | * won't get another interrupt, so process any outstanding packets | |
497 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
498 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
499 | if (napi_schedule_prep(&vi->napi)) { | |
500 | virtqueue_disable_cb(vi->rvq); | |
ec13ee80 | 501 | local_bh_disable(); |
3e9d08ec | 502 | __napi_schedule(&vi->napi); |
ec13ee80 | 503 | local_bh_enable(); |
3e9d08ec BR |
504 | } |
505 | } | |
506 | ||
3161e453 RR |
507 | static void refill_work(struct work_struct *work) |
508 | { | |
509 | struct virtnet_info *vi; | |
510 | bool still_empty; | |
511 | ||
512 | vi = container_of(work, struct virtnet_info, refill.work); | |
513 | napi_disable(&vi->napi); | |
39d32157 | 514 | still_empty = !try_fill_recv(vi, GFP_KERNEL); |
3e9d08ec | 515 | virtnet_napi_enable(vi); |
3161e453 RR |
516 | |
517 | /* In theory, this can happen: if we don't get any buffers in | |
518 | * we will *never* try to fill again. */ | |
519 | if (still_empty) | |
3b07e9ca | 520 | schedule_delayed_work(&vi->refill, HZ/2); |
3161e453 RR |
521 | } |
522 | ||
296f96fc RR |
523 | static int virtnet_poll(struct napi_struct *napi, int budget) |
524 | { | |
525 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
9ab86bbc | 526 | void *buf; |
296f96fc RR |
527 | unsigned int len, received = 0; |
528 | ||
529 | again: | |
530 | while (received < budget && | |
1915a712 | 531 | (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) { |
9ab86bbc SM |
532 | receive_buf(vi->dev, buf, len); |
533 | --vi->num; | |
296f96fc RR |
534 | received++; |
535 | } | |
536 | ||
3161e453 RR |
537 | if (vi->num < vi->max / 2) { |
538 | if (!try_fill_recv(vi, GFP_ATOMIC)) | |
3b07e9ca | 539 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 540 | } |
296f96fc | 541 | |
8329d98e RR |
542 | /* Out of packets? */ |
543 | if (received < budget) { | |
288379f0 | 544 | napi_complete(napi); |
1915a712 | 545 | if (unlikely(!virtqueue_enable_cb(vi->rvq)) && |
8e95a202 | 546 | napi_schedule_prep(napi)) { |
1915a712 | 547 | virtqueue_disable_cb(vi->rvq); |
288379f0 | 548 | __napi_schedule(napi); |
296f96fc | 549 | goto again; |
4265f161 | 550 | } |
296f96fc RR |
551 | } |
552 | ||
553 | return received; | |
554 | } | |
555 | ||
48925e37 | 556 | static unsigned int free_old_xmit_skbs(struct virtnet_info *vi) |
296f96fc RR |
557 | { |
558 | struct sk_buff *skb; | |
48925e37 | 559 | unsigned int len, tot_sgs = 0; |
58472a76 | 560 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 561 | |
1915a712 | 562 | while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) { |
296f96fc | 563 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 564 | |
83a27052 | 565 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 566 | stats->tx_bytes += skb->len; |
567 | stats->tx_packets++; | |
83a27052 | 568 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 569 | |
48925e37 | 570 | tot_sgs += skb_vnet_hdr(skb)->num_sg; |
ed79bab8 | 571 | dev_kfree_skb_any(skb); |
296f96fc | 572 | } |
48925e37 | 573 | return tot_sgs; |
296f96fc RR |
574 | } |
575 | ||
99ffc696 | 576 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 577 | { |
b3f24698 | 578 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
296f96fc | 579 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
296f96fc | 580 | |
e174961c | 581 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 582 | |
296f96fc | 583 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 584 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
55508d60 | 585 | hdr->hdr.csum_start = skb_checksum_start_offset(skb); |
b3f24698 | 586 | hdr->hdr.csum_offset = skb->csum_offset; |
296f96fc | 587 | } else { |
b3f24698 RR |
588 | hdr->hdr.flags = 0; |
589 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
590 | } |
591 | ||
592 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
593 | hdr->hdr.hdr_len = skb_headlen(skb); |
594 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 595 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 596 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 597 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 598 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 599 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 600 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
601 | else |
602 | BUG(); | |
34a48579 | 603 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 604 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 605 | } else { |
b3f24698 RR |
606 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
607 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
608 | } |
609 | ||
b3f24698 | 610 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 MM |
611 | |
612 | /* Encode metadata header at front. */ | |
613 | if (vi->mergeable_rx_bufs) | |
5e01d2f9 | 614 | sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr); |
3f2c31d9 | 615 | else |
5e01d2f9 | 616 | sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr); |
3f2c31d9 | 617 | |
5e01d2f9 | 618 | hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1; |
1756ac3d | 619 | return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg, |
f96fde41 | 620 | 0, skb, GFP_ATOMIC); |
11a3a154 RR |
621 | } |
622 | ||
424efe9c | 623 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
624 | { |
625 | struct virtnet_info *vi = netdev_priv(dev); | |
48925e37 | 626 | int capacity; |
2cb9c6ba | 627 | |
2cb9c6ba RR |
628 | /* Free up any pending old buffers before queueing new ones. */ |
629 | free_old_xmit_skbs(vi); | |
99ffc696 | 630 | |
03f191ba | 631 | /* Try to transmit */ |
48925e37 RR |
632 | capacity = xmit_skb(vi, skb); |
633 | ||
634 | /* This can happen with OOM and indirect buffers. */ | |
635 | if (unlikely(capacity < 0)) { | |
2e57b79c | 636 | if (likely(capacity == -ENOMEM)) { |
31304165 | 637 | if (net_ratelimit()) |
58eba97d RR |
638 | dev_warn(&dev->dev, |
639 | "TX queue failure: out of memory\n"); | |
31304165 | 640 | } else { |
2e57b79c RJ |
641 | dev->stats.tx_fifo_errors++; |
642 | if (net_ratelimit()) | |
58eba97d RR |
643 | dev_warn(&dev->dev, |
644 | "Unexpected TX queue failure: %d\n", | |
645 | capacity); | |
48925e37 | 646 | } |
58eba97d RR |
647 | dev->stats.tx_dropped++; |
648 | kfree_skb(skb); | |
649 | return NETDEV_TX_OK; | |
296f96fc | 650 | } |
1915a712 | 651 | virtqueue_kick(vi->svq); |
03f191ba | 652 | |
48925e37 RR |
653 | /* Don't wait up for transmitted skbs to be freed. */ |
654 | skb_orphan(skb); | |
655 | nf_reset(skb); | |
656 | ||
657 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
658 | * before it gets out of hand. Naturally, this wastes entries. */ | |
659 | if (capacity < 2+MAX_SKB_FRAGS) { | |
660 | netif_stop_queue(dev); | |
7a66f784 | 661 | if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) { |
48925e37 RR |
662 | /* More just got used, free them then recheck. */ |
663 | capacity += free_old_xmit_skbs(vi); | |
664 | if (capacity >= 2+MAX_SKB_FRAGS) { | |
665 | netif_start_queue(dev); | |
1915a712 | 666 | virtqueue_disable_cb(vi->svq); |
48925e37 RR |
667 | } |
668 | } | |
99ffc696 | 669 | } |
48925e37 RR |
670 | |
671 | return NETDEV_TX_OK; | |
296f96fc RR |
672 | } |
673 | ||
9c46f6d4 AW |
674 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
675 | { | |
676 | struct virtnet_info *vi = netdev_priv(dev); | |
677 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 678 | int ret; |
9c46f6d4 | 679 | |
f2f2c8b4 JP |
680 | ret = eth_mac_addr(dev, p); |
681 | if (ret) | |
682 | return ret; | |
9c46f6d4 | 683 | |
62994b2d AW |
684 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
685 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), | |
686 | dev->dev_addr, dev->addr_len); | |
9c46f6d4 AW |
687 | |
688 | return 0; | |
689 | } | |
690 | ||
3fa2a1df | 691 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
692 | struct rtnl_link_stats64 *tot) | |
693 | { | |
694 | struct virtnet_info *vi = netdev_priv(dev); | |
695 | int cpu; | |
696 | unsigned int start; | |
697 | ||
698 | for_each_possible_cpu(cpu) { | |
58472a76 | 699 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 700 | u64 tpackets, tbytes, rpackets, rbytes; |
701 | ||
702 | do { | |
e3906486 | 703 | start = u64_stats_fetch_begin_bh(&stats->tx_syncp); |
3fa2a1df | 704 | tpackets = stats->tx_packets; |
705 | tbytes = stats->tx_bytes; | |
e3906486 | 706 | } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start)); |
83a27052 ED |
707 | |
708 | do { | |
e3906486 | 709 | start = u64_stats_fetch_begin_bh(&stats->rx_syncp); |
3fa2a1df | 710 | rpackets = stats->rx_packets; |
711 | rbytes = stats->rx_bytes; | |
e3906486 | 712 | } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start)); |
3fa2a1df | 713 | |
714 | tot->rx_packets += rpackets; | |
715 | tot->tx_packets += tpackets; | |
716 | tot->rx_bytes += rbytes; | |
717 | tot->tx_bytes += tbytes; | |
718 | } | |
719 | ||
720 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 721 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 722 | tot->rx_dropped = dev->stats.rx_dropped; |
723 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
724 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
725 | ||
726 | return tot; | |
727 | } | |
728 | ||
da74e89d AS |
729 | #ifdef CONFIG_NET_POLL_CONTROLLER |
730 | static void virtnet_netpoll(struct net_device *dev) | |
731 | { | |
732 | struct virtnet_info *vi = netdev_priv(dev); | |
733 | ||
734 | napi_schedule(&vi->napi); | |
735 | } | |
736 | #endif | |
737 | ||
296f96fc RR |
738 | static int virtnet_open(struct net_device *dev) |
739 | { | |
740 | struct virtnet_info *vi = netdev_priv(dev); | |
741 | ||
b2baed69 RR |
742 | /* Make sure we have some buffers: if oom use wq. */ |
743 | if (!try_fill_recv(vi, GFP_KERNEL)) | |
3b07e9ca | 744 | schedule_delayed_work(&vi->refill, 0); |
b2baed69 | 745 | |
3e9d08ec | 746 | virtnet_napi_enable(vi); |
296f96fc RR |
747 | return 0; |
748 | } | |
749 | ||
2a41f71d AW |
750 | /* |
751 | * Send command via the control virtqueue and check status. Commands | |
752 | * supported by the hypervisor, as indicated by feature bits, should | |
753 | * never fail unless improperly formated. | |
754 | */ | |
755 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
756 | struct scatterlist *data, int out, int in) | |
757 | { | |
23e258e1 | 758 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
2a41f71d AW |
759 | struct virtio_net_ctrl_hdr ctrl; |
760 | virtio_net_ctrl_ack status = ~0; | |
761 | unsigned int tmp; | |
23e258e1 | 762 | int i; |
2a41f71d | 763 | |
0ee904c3 AB |
764 | /* Caller should know better */ |
765 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || | |
766 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); | |
2a41f71d AW |
767 | |
768 | out++; /* Add header */ | |
769 | in++; /* Add return status */ | |
770 | ||
771 | ctrl.class = class; | |
772 | ctrl.cmd = cmd; | |
773 | ||
774 | sg_init_table(sg, out + in); | |
775 | ||
776 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); | |
23e258e1 AW |
777 | for_each_sg(data, s, out + in - 2, i) |
778 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); | |
2a41f71d AW |
779 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
780 | ||
f96fde41 | 781 | BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0); |
2a41f71d | 782 | |
1915a712 | 783 | virtqueue_kick(vi->cvq); |
2a41f71d AW |
784 | |
785 | /* | |
786 | * Spin for a response, the kick causes an ioport write, trapping | |
787 | * into the hypervisor, so the request should be handled immediately. | |
788 | */ | |
1915a712 | 789 | while (!virtqueue_get_buf(vi->cvq, &tmp)) |
2a41f71d AW |
790 | cpu_relax(); |
791 | ||
792 | return status == VIRTIO_NET_OK; | |
793 | } | |
794 | ||
586d17c5 JW |
795 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
796 | { | |
797 | rtnl_lock(); | |
798 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
799 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, | |
800 | 0, 0)) | |
801 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); | |
802 | rtnl_unlock(); | |
803 | } | |
804 | ||
296f96fc RR |
805 | static int virtnet_close(struct net_device *dev) |
806 | { | |
807 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc | 808 | |
b2baed69 RR |
809 | /* Make sure refill_work doesn't re-enable napi! */ |
810 | cancel_delayed_work_sync(&vi->refill); | |
296f96fc RR |
811 | napi_disable(&vi->napi); |
812 | ||
296f96fc RR |
813 | return 0; |
814 | } | |
815 | ||
2af7698e AW |
816 | static void virtnet_set_rx_mode(struct net_device *dev) |
817 | { | |
818 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 819 | struct scatterlist sg[2]; |
2af7698e | 820 | u8 promisc, allmulti; |
f565a7c2 | 821 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 822 | struct netdev_hw_addr *ha; |
32e7bfc4 | 823 | int uc_count; |
4cd24eaf | 824 | int mc_count; |
f565a7c2 AW |
825 | void *buf; |
826 | int i; | |
2af7698e AW |
827 | |
828 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
829 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
830 | return; | |
831 | ||
f565a7c2 AW |
832 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
833 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 834 | |
23e258e1 | 835 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
836 | |
837 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
838 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f565a7c2 | 839 | sg, 1, 0)) |
2af7698e AW |
840 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
841 | promisc ? "en" : "dis"); | |
842 | ||
23e258e1 | 843 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
844 | |
845 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
846 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f565a7c2 | 847 | sg, 1, 0)) |
2af7698e AW |
848 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
849 | allmulti ? "en" : "dis"); | |
f565a7c2 | 850 | |
32e7bfc4 | 851 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 852 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 853 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
854 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
855 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
856 | mac_data = buf; | |
f565a7c2 AW |
857 | if (!buf) { |
858 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); | |
859 | return; | |
860 | } | |
861 | ||
23e258e1 AW |
862 | sg_init_table(sg, 2); |
863 | ||
f565a7c2 | 864 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 865 | mac_data->entries = uc_count; |
ccffad25 | 866 | i = 0; |
32e7bfc4 | 867 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 868 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
869 | |
870 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 871 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
872 | |
873 | /* multicast list and count fill the end */ | |
32e7bfc4 | 874 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 875 | |
4cd24eaf | 876 | mac_data->entries = mc_count; |
567ec874 | 877 | i = 0; |
22bedad3 JP |
878 | netdev_for_each_mc_addr(ha, dev) |
879 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
880 | |
881 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 882 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
883 | |
884 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
885 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
886 | sg, 2, 0)) | |
887 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); | |
888 | ||
889 | kfree(buf); | |
2af7698e AW |
890 | } |
891 | ||
8e586137 | 892 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
893 | { |
894 | struct virtnet_info *vi = netdev_priv(dev); | |
895 | struct scatterlist sg; | |
896 | ||
23e258e1 | 897 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
898 | |
899 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
900 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) | |
901 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); | |
8e586137 | 902 | return 0; |
0bde9569 AW |
903 | } |
904 | ||
8e586137 | 905 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
906 | { |
907 | struct virtnet_info *vi = netdev_priv(dev); | |
908 | struct scatterlist sg; | |
909 | ||
23e258e1 | 910 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
911 | |
912 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
913 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) | |
914 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); | |
8e586137 | 915 | return 0; |
0bde9569 AW |
916 | } |
917 | ||
8f9f4668 RJ |
918 | static void virtnet_get_ringparam(struct net_device *dev, |
919 | struct ethtool_ringparam *ring) | |
920 | { | |
921 | struct virtnet_info *vi = netdev_priv(dev); | |
922 | ||
923 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq); | |
924 | ring->tx_max_pending = virtqueue_get_vring_size(vi->svq); | |
925 | ring->rx_pending = ring->rx_max_pending; | |
926 | ring->tx_pending = ring->tx_max_pending; | |
927 | ||
928 | } | |
929 | ||
66846048 RJ |
930 | |
931 | static void virtnet_get_drvinfo(struct net_device *dev, | |
932 | struct ethtool_drvinfo *info) | |
933 | { | |
934 | struct virtnet_info *vi = netdev_priv(dev); | |
935 | struct virtio_device *vdev = vi->vdev; | |
936 | ||
937 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
938 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
939 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
940 | ||
941 | } | |
942 | ||
0fc0b732 | 943 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 944 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 945 | .get_link = ethtool_op_get_link, |
8f9f4668 | 946 | .get_ringparam = virtnet_get_ringparam, |
a9ea3fc6 HX |
947 | }; |
948 | ||
39da5814 MM |
949 | #define MIN_MTU 68 |
950 | #define MAX_MTU 65535 | |
951 | ||
952 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
953 | { | |
954 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
955 | return -EINVAL; | |
956 | dev->mtu = new_mtu; | |
957 | return 0; | |
958 | } | |
959 | ||
76288b4e SH |
960 | static const struct net_device_ops virtnet_netdev = { |
961 | .ndo_open = virtnet_open, | |
962 | .ndo_stop = virtnet_close, | |
963 | .ndo_start_xmit = start_xmit, | |
964 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 965 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 966 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 967 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 968 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
969 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
970 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
971 | #ifdef CONFIG_NET_POLL_CONTROLLER |
972 | .ndo_poll_controller = virtnet_netpoll, | |
973 | #endif | |
974 | }; | |
975 | ||
586d17c5 | 976 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 977 | { |
586d17c5 JW |
978 | struct virtnet_info *vi = |
979 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
980 | u16 v; |
981 | ||
586d17c5 JW |
982 | mutex_lock(&vi->config_lock); |
983 | if (!vi->config_enable) | |
984 | goto done; | |
985 | ||
77dd7693 | 986 | if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS, |
9f4d26d0 | 987 | offsetof(struct virtio_net_config, status), |
77dd7693 | 988 | &v) < 0) |
586d17c5 JW |
989 | goto done; |
990 | ||
991 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 992 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
993 | virtnet_ack_link_announce(vi); |
994 | } | |
9f4d26d0 MM |
995 | |
996 | /* Ignore unknown (future) status bits */ | |
997 | v &= VIRTIO_NET_S_LINK_UP; | |
998 | ||
999 | if (vi->status == v) | |
586d17c5 | 1000 | goto done; |
9f4d26d0 MM |
1001 | |
1002 | vi->status = v; | |
1003 | ||
1004 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1005 | netif_carrier_on(vi->dev); | |
1006 | netif_wake_queue(vi->dev); | |
1007 | } else { | |
1008 | netif_carrier_off(vi->dev); | |
1009 | netif_stop_queue(vi->dev); | |
1010 | } | |
586d17c5 JW |
1011 | done: |
1012 | mutex_unlock(&vi->config_lock); | |
9f4d26d0 MM |
1013 | } |
1014 | ||
1015 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1016 | { | |
1017 | struct virtnet_info *vi = vdev->priv; | |
1018 | ||
3b07e9ca | 1019 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1020 | } |
1021 | ||
3f9c10b0 AS |
1022 | static int init_vqs(struct virtnet_info *vi) |
1023 | { | |
1024 | struct virtqueue *vqs[3]; | |
1025 | vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; | |
1026 | const char *names[] = { "input", "output", "control" }; | |
1027 | int nvqs, err; | |
1028 | ||
1029 | /* We expect two virtqueues, receive then send, | |
1030 | * and optionally control. */ | |
1031 | nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; | |
1032 | ||
1033 | err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names); | |
1034 | if (err) | |
1035 | return err; | |
1036 | ||
1037 | vi->rvq = vqs[0]; | |
1038 | vi->svq = vqs[1]; | |
1039 | ||
1040 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { | |
1041 | vi->cvq = vqs[2]; | |
1042 | ||
1043 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) | |
1044 | vi->dev->features |= NETIF_F_HW_VLAN_FILTER; | |
1045 | } | |
1046 | return 0; | |
1047 | } | |
1048 | ||
296f96fc RR |
1049 | static int virtnet_probe(struct virtio_device *vdev) |
1050 | { | |
1051 | int err; | |
296f96fc RR |
1052 | struct net_device *dev; |
1053 | struct virtnet_info *vi; | |
296f96fc RR |
1054 | |
1055 | /* Allocate ourselves a network device with room for our info */ | |
1056 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
1057 | if (!dev) | |
1058 | return -ENOMEM; | |
1059 | ||
1060 | /* Set up network device as normal. */ | |
f2f2c8b4 | 1061 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 1062 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1063 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1064 | |
a9ea3fc6 | 1065 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
1066 | SET_NETDEV_DEV(dev, &vdev->dev); |
1067 | ||
1068 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1069 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1070 | /* This opens up the world of extra features. */ |
98e778c9 MM |
1071 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
1072 | if (csum) | |
1073 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1074 | ||
1075 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
1076 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO | |
34a48579 RR |
1077 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1078 | } | |
5539ae96 | 1079 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1080 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1081 | dev->hw_features |= NETIF_F_TSO; | |
1082 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1083 | dev->hw_features |= NETIF_F_TSO6; | |
1084 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1085 | dev->hw_features |= NETIF_F_TSO_ECN; | |
1086 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) | |
1087 | dev->hw_features |= NETIF_F_UFO; | |
1088 | ||
1089 | if (gso) | |
1090 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); | |
1091 | /* (!csum && gso) case will be fixed by register_netdev() */ | |
296f96fc RR |
1092 | } |
1093 | ||
1094 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
77dd7693 | 1095 | if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC, |
a586d4f6 | 1096 | offsetof(struct virtio_net_config, mac), |
77dd7693 | 1097 | dev->dev_addr, dev->addr_len) < 0) |
f2cedb63 | 1098 | eth_hw_addr_random(dev); |
296f96fc RR |
1099 | |
1100 | /* Set up our device-specific information */ | |
1101 | vi = netdev_priv(dev); | |
6c0cd7c0 | 1102 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
1103 | vi->dev = dev; |
1104 | vi->vdev = vdev; | |
d9d5dcc8 | 1105 | vdev->priv = vi; |
fb6813f4 | 1106 | vi->pages = NULL; |
3fa2a1df | 1107 | vi->stats = alloc_percpu(struct virtnet_stats); |
1108 | err = -ENOMEM; | |
1109 | if (vi->stats == NULL) | |
1110 | goto free; | |
1111 | ||
3161e453 | 1112 | INIT_DELAYED_WORK(&vi->refill, refill_work); |
586d17c5 JW |
1113 | mutex_init(&vi->config_lock); |
1114 | vi->config_enable = true; | |
1115 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); | |
5e01d2f9 MT |
1116 | sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg)); |
1117 | sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg)); | |
296f96fc | 1118 | |
97402b96 | 1119 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1120 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1121 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
1122 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
97402b96 HX |
1123 | vi->big_packets = true; |
1124 | ||
3f2c31d9 MM |
1125 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1126 | vi->mergeable_rx_bufs = true; | |
1127 | ||
3f9c10b0 | 1128 | err = init_vqs(vi); |
d2a7ddda | 1129 | if (err) |
3fa2a1df | 1130 | goto free_stats; |
296f96fc | 1131 | |
296f96fc RR |
1132 | err = register_netdev(dev); |
1133 | if (err) { | |
1134 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1135 | goto free_vqs; |
296f96fc | 1136 | } |
b3369c1f RR |
1137 | |
1138 | /* Last of all, set up some receive buffers. */ | |
3161e453 | 1139 | try_fill_recv(vi, GFP_KERNEL); |
b3369c1f RR |
1140 | |
1141 | /* If we didn't even get one input buffer, we're useless. */ | |
1142 | if (vi->num == 0) { | |
1143 | err = -ENOMEM; | |
1144 | goto unregister; | |
1145 | } | |
1146 | ||
167c25e4 JW |
1147 | /* Assume link up if device can't report link status, |
1148 | otherwise get link status from config. */ | |
1149 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1150 | netif_carrier_off(dev); | |
3b07e9ca | 1151 | schedule_work(&vi->config_work); |
167c25e4 JW |
1152 | } else { |
1153 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1154 | netif_carrier_on(dev); | |
1155 | } | |
9f4d26d0 | 1156 | |
296f96fc | 1157 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
1158 | return 0; |
1159 | ||
b3369c1f RR |
1160 | unregister: |
1161 | unregister_netdev(dev); | |
d2a7ddda MT |
1162 | free_vqs: |
1163 | vdev->config->del_vqs(vdev); | |
3fa2a1df | 1164 | free_stats: |
1165 | free_percpu(vi->stats); | |
296f96fc RR |
1166 | free: |
1167 | free_netdev(dev); | |
1168 | return err; | |
1169 | } | |
1170 | ||
9ab86bbc SM |
1171 | static void free_unused_bufs(struct virtnet_info *vi) |
1172 | { | |
1173 | void *buf; | |
830a8a97 | 1174 | while (1) { |
1915a712 | 1175 | buf = virtqueue_detach_unused_buf(vi->svq); |
830a8a97 SM |
1176 | if (!buf) |
1177 | break; | |
1178 | dev_kfree_skb(buf); | |
1179 | } | |
9ab86bbc | 1180 | while (1) { |
1915a712 | 1181 | buf = virtqueue_detach_unused_buf(vi->rvq); |
9ab86bbc SM |
1182 | if (!buf) |
1183 | break; | |
1184 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
1185 | give_pages(vi, buf); | |
1186 | else | |
1187 | dev_kfree_skb(buf); | |
1188 | --vi->num; | |
1189 | } | |
1190 | BUG_ON(vi->num != 0); | |
1191 | } | |
1192 | ||
04486ed0 | 1193 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1194 | { |
04486ed0 | 1195 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1196 | |
1197 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1198 | free_unused_bufs(vi); |
fb6813f4 | 1199 | |
04486ed0 | 1200 | vi->vdev->config->del_vqs(vi->vdev); |
d2a7ddda | 1201 | |
fb6813f4 RR |
1202 | while (vi->pages) |
1203 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); | |
04486ed0 AS |
1204 | } |
1205 | ||
8cc085d6 | 1206 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
1207 | { |
1208 | struct virtnet_info *vi = vdev->priv; | |
1209 | ||
586d17c5 JW |
1210 | /* Prevent config work handler from accessing the device. */ |
1211 | mutex_lock(&vi->config_lock); | |
1212 | vi->config_enable = false; | |
1213 | mutex_unlock(&vi->config_lock); | |
1214 | ||
04486ed0 AS |
1215 | unregister_netdev(vi->dev); |
1216 | ||
1217 | remove_vq_common(vi); | |
fb6813f4 | 1218 | |
586d17c5 JW |
1219 | flush_work(&vi->config_work); |
1220 | ||
2e66f55b | 1221 | free_percpu(vi->stats); |
74b2553f | 1222 | free_netdev(vi->dev); |
296f96fc RR |
1223 | } |
1224 | ||
0741bcb5 AS |
1225 | #ifdef CONFIG_PM |
1226 | static int virtnet_freeze(struct virtio_device *vdev) | |
1227 | { | |
1228 | struct virtnet_info *vi = vdev->priv; | |
1229 | ||
586d17c5 JW |
1230 | /* Prevent config work handler from accessing the device */ |
1231 | mutex_lock(&vi->config_lock); | |
1232 | vi->config_enable = false; | |
1233 | mutex_unlock(&vi->config_lock); | |
1234 | ||
0741bcb5 AS |
1235 | netif_device_detach(vi->dev); |
1236 | cancel_delayed_work_sync(&vi->refill); | |
1237 | ||
1238 | if (netif_running(vi->dev)) | |
1239 | napi_disable(&vi->napi); | |
1240 | ||
1241 | remove_vq_common(vi); | |
1242 | ||
586d17c5 JW |
1243 | flush_work(&vi->config_work); |
1244 | ||
0741bcb5 AS |
1245 | return 0; |
1246 | } | |
1247 | ||
1248 | static int virtnet_restore(struct virtio_device *vdev) | |
1249 | { | |
1250 | struct virtnet_info *vi = vdev->priv; | |
1251 | int err; | |
1252 | ||
1253 | err = init_vqs(vi); | |
1254 | if (err) | |
1255 | return err; | |
1256 | ||
1257 | if (netif_running(vi->dev)) | |
1258 | virtnet_napi_enable(vi); | |
1259 | ||
1260 | netif_device_attach(vi->dev); | |
1261 | ||
1262 | if (!try_fill_recv(vi, GFP_KERNEL)) | |
3b07e9ca | 1263 | schedule_delayed_work(&vi->refill, 0); |
0741bcb5 | 1264 | |
586d17c5 JW |
1265 | mutex_lock(&vi->config_lock); |
1266 | vi->config_enable = true; | |
1267 | mutex_unlock(&vi->config_lock); | |
1268 | ||
0741bcb5 AS |
1269 | return 0; |
1270 | } | |
1271 | #endif | |
1272 | ||
296f96fc RR |
1273 | static struct virtio_device_id id_table[] = { |
1274 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1275 | { 0 }, | |
1276 | }; | |
1277 | ||
c45a6816 | 1278 | static unsigned int features[] = { |
5e4fe5c4 MM |
1279 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1280 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1281 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1282 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1283 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1284 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1285 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
586d17c5 | 1286 | VIRTIO_NET_F_GUEST_ANNOUNCE, |
c45a6816 RR |
1287 | }; |
1288 | ||
22402529 | 1289 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1290 | .feature_table = features, |
1291 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1292 | .driver.name = KBUILD_MODNAME, |
1293 | .driver.owner = THIS_MODULE, | |
1294 | .id_table = id_table, | |
1295 | .probe = virtnet_probe, | |
8cc085d6 | 1296 | .remove = virtnet_remove, |
9f4d26d0 | 1297 | .config_changed = virtnet_config_changed, |
0741bcb5 AS |
1298 | #ifdef CONFIG_PM |
1299 | .freeze = virtnet_freeze, | |
1300 | .restore = virtnet_restore, | |
1301 | #endif | |
296f96fc RR |
1302 | }; |
1303 | ||
1304 | static int __init init(void) | |
1305 | { | |
22402529 | 1306 | return register_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1307 | } |
1308 | ||
1309 | static void __exit fini(void) | |
1310 | { | |
22402529 | 1311 | unregister_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1312 | } |
1313 | module_init(init); | |
1314 | module_exit(fini); | |
1315 | ||
1316 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1317 | MODULE_DESCRIPTION("Virtio network driver"); | |
1318 | MODULE_LICENSE("GPL"); |