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 { |
45 | struct u64_stats_sync syncp; | |
46 | u64 tx_bytes; | |
47 | u64 tx_packets; | |
48 | ||
49 | u64 rx_bytes; | |
50 | u64 rx_packets; | |
51 | }; | |
52 | ||
5e01d2f9 | 53 | struct virtnet_info { |
296f96fc | 54 | struct virtio_device *vdev; |
2a41f71d | 55 | struct virtqueue *rvq, *svq, *cvq; |
296f96fc RR |
56 | struct net_device *dev; |
57 | struct napi_struct napi; | |
9f4d26d0 | 58 | unsigned int status; |
296f96fc RR |
59 | |
60 | /* Number of input buffers, and max we've ever had. */ | |
61 | unsigned int num, max; | |
62 | ||
97402b96 HX |
63 | /* I like... big packets and I cannot lie! */ |
64 | bool big_packets; | |
65 | ||
3f2c31d9 MM |
66 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
67 | bool mergeable_rx_bufs; | |
68 | ||
3fa2a1df | 69 | /* Active statistics */ |
70 | struct virtnet_stats __percpu *stats; | |
71 | ||
3161e453 RR |
72 | /* Work struct for refilling if we run low on memory. */ |
73 | struct delayed_work refill; | |
74 | ||
fb6813f4 RR |
75 | /* Chain pages by the private ptr. */ |
76 | struct page *pages; | |
5e01d2f9 MT |
77 | |
78 | /* fragments + linear part + virtio header */ | |
79 | struct scatterlist rx_sg[MAX_SKB_FRAGS + 2]; | |
80 | struct scatterlist tx_sg[MAX_SKB_FRAGS + 2]; | |
296f96fc RR |
81 | }; |
82 | ||
b3f24698 RR |
83 | struct skb_vnet_hdr { |
84 | union { | |
85 | struct virtio_net_hdr hdr; | |
86 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
87 | }; | |
48925e37 | 88 | unsigned int num_sg; |
b3f24698 RR |
89 | }; |
90 | ||
9ab86bbc SM |
91 | struct padded_vnet_hdr { |
92 | struct virtio_net_hdr hdr; | |
93 | /* | |
94 | * virtio_net_hdr should be in a separated sg buffer because of a | |
95 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
96 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
97 | */ | |
98 | char padding[6]; | |
99 | }; | |
100 | ||
b3f24698 | 101 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 102 | { |
b3f24698 | 103 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
104 | } |
105 | ||
9ab86bbc SM |
106 | /* |
107 | * private is used to chain pages for big packets, put the whole | |
108 | * most recent used list in the beginning for reuse | |
109 | */ | |
110 | static void give_pages(struct virtnet_info *vi, struct page *page) | |
0a888fd1 | 111 | { |
9ab86bbc | 112 | struct page *end; |
0a888fd1 | 113 | |
9ab86bbc SM |
114 | /* Find end of list, sew whole thing into vi->pages. */ |
115 | for (end = page; end->private; end = (struct page *)end->private); | |
116 | end->private = (unsigned long)vi->pages; | |
117 | vi->pages = page; | |
0a888fd1 MM |
118 | } |
119 | ||
fb6813f4 RR |
120 | static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) |
121 | { | |
122 | struct page *p = vi->pages; | |
123 | ||
9ab86bbc | 124 | if (p) { |
fb6813f4 | 125 | vi->pages = (struct page *)p->private; |
9ab86bbc SM |
126 | /* clear private here, it is used to chain pages */ |
127 | p->private = 0; | |
128 | } else | |
fb6813f4 RR |
129 | p = alloc_page(gfp_mask); |
130 | return p; | |
131 | } | |
132 | ||
2cb9c6ba | 133 | static void skb_xmit_done(struct virtqueue *svq) |
296f96fc | 134 | { |
2cb9c6ba | 135 | struct virtnet_info *vi = svq->vdev->priv; |
296f96fc | 136 | |
2cb9c6ba | 137 | /* Suppress further interrupts. */ |
1915a712 | 138 | virtqueue_disable_cb(svq); |
11a3a154 | 139 | |
363f1514 | 140 | /* We were probably waiting for more output buffers. */ |
296f96fc | 141 | netif_wake_queue(vi->dev); |
296f96fc RR |
142 | } |
143 | ||
9ab86bbc SM |
144 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
145 | unsigned int offset, unsigned int *len) | |
296f96fc | 146 | { |
8a59a7b9 | 147 | int size = min((unsigned)PAGE_SIZE - offset, *len); |
9ab86bbc | 148 | int i = skb_shinfo(skb)->nr_frags; |
9ab86bbc | 149 | |
8a59a7b9 | 150 | __skb_fill_page_desc(skb, i, page, offset, size); |
9ab86bbc | 151 | |
8a59a7b9 KK |
152 | skb->data_len += size; |
153 | skb->len += size; | |
4b727361 | 154 | skb->truesize += PAGE_SIZE; |
9ab86bbc | 155 | skb_shinfo(skb)->nr_frags++; |
8a59a7b9 | 156 | *len -= size; |
9ab86bbc | 157 | } |
23cde76d | 158 | |
3464645a | 159 | /* Called from bottom half context */ |
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 | |
e878d78b SL |
198 | /* |
199 | * Verify that we can indeed put this data into a skb. | |
200 | * This is here to handle cases when the device erroneously | |
201 | * tries to receive more than is possible. This is usually | |
202 | * the case of a broken device. | |
203 | */ | |
204 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
205 | if (net_ratelimit()) | |
206 | pr_debug("%s: too much data\n", skb->dev->name); | |
207 | dev_kfree_skb(skb); | |
208 | return NULL; | |
209 | } | |
210 | ||
9ab86bbc SM |
211 | while (len) { |
212 | set_skb_frag(skb, page, offset, &len); | |
213 | page = (struct page *)page->private; | |
214 | offset = 0; | |
215 | } | |
3f2c31d9 | 216 | |
9ab86bbc SM |
217 | if (page) |
218 | give_pages(vi, page); | |
3f2c31d9 | 219 | |
9ab86bbc SM |
220 | return skb; |
221 | } | |
3f2c31d9 | 222 | |
9ab86bbc SM |
223 | static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb) |
224 | { | |
225 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); | |
226 | struct page *page; | |
227 | int num_buf, i, len; | |
228 | ||
229 | num_buf = hdr->mhdr.num_buffers; | |
230 | while (--num_buf) { | |
231 | i = skb_shinfo(skb)->nr_frags; | |
232 | if (i >= MAX_SKB_FRAGS) { | |
233 | pr_debug("%s: packet too long\n", skb->dev->name); | |
234 | skb->dev->stats.rx_length_errors++; | |
235 | return -EINVAL; | |
236 | } | |
1915a712 | 237 | page = virtqueue_get_buf(vi->rvq, &len); |
9ab86bbc SM |
238 | if (!page) { |
239 | pr_debug("%s: rx error: %d buffers missing\n", | |
240 | skb->dev->name, hdr->mhdr.num_buffers); | |
241 | skb->dev->stats.rx_length_errors++; | |
242 | return -EINVAL; | |
3f2c31d9 | 243 | } |
3fa2a1df | 244 | |
9ab86bbc SM |
245 | if (len > PAGE_SIZE) |
246 | len = PAGE_SIZE; | |
247 | ||
248 | set_skb_frag(skb, page, 0, &len); | |
249 | ||
250 | --vi->num; | |
251 | } | |
252 | return 0; | |
253 | } | |
254 | ||
255 | static void receive_buf(struct net_device *dev, void *buf, unsigned int len) | |
256 | { | |
257 | struct virtnet_info *vi = netdev_priv(dev); | |
58472a76 | 258 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc SM |
259 | struct sk_buff *skb; |
260 | struct page *page; | |
261 | struct skb_vnet_hdr *hdr; | |
3f2c31d9 | 262 | |
9ab86bbc SM |
263 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
264 | pr_debug("%s: short packet %i\n", dev->name, len); | |
265 | dev->stats.rx_length_errors++; | |
266 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
267 | give_pages(vi, buf); | |
268 | else | |
269 | dev_kfree_skb(buf); | |
270 | return; | |
271 | } | |
3f2c31d9 | 272 | |
9ab86bbc SM |
273 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
274 | skb = buf; | |
275 | len -= sizeof(struct virtio_net_hdr); | |
276 | skb_trim(skb, len); | |
277 | } else { | |
278 | page = buf; | |
279 | skb = page_to_skb(vi, page, len); | |
280 | if (unlikely(!skb)) { | |
3f2c31d9 | 281 | dev->stats.rx_dropped++; |
9ab86bbc SM |
282 | give_pages(vi, page); |
283 | return; | |
3f2c31d9 | 284 | } |
9ab86bbc SM |
285 | if (vi->mergeable_rx_bufs) |
286 | if (receive_mergeable(vi, skb)) { | |
287 | dev_kfree_skb(skb); | |
288 | return; | |
289 | } | |
97402b96 | 290 | } |
3f2c31d9 | 291 | |
9ab86bbc | 292 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 293 | |
294 | u64_stats_update_begin(&stats->syncp); | |
295 | stats->rx_bytes += skb->len; | |
296 | stats->rx_packets++; | |
297 | u64_stats_update_end(&stats->syncp); | |
296f96fc | 298 | |
b3f24698 | 299 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 300 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
301 | if (!skb_partial_csum_set(skb, |
302 | hdr->hdr.csum_start, | |
303 | hdr->hdr.csum_offset)) | |
296f96fc | 304 | goto frame_err; |
10a8d94a JW |
305 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
306 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
307 | } |
308 | ||
23cde76d MM |
309 | skb->protocol = eth_type_trans(skb, dev); |
310 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
311 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
312 | ||
b3f24698 | 313 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 314 | pr_debug("GSO!\n"); |
b3f24698 | 315 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
316 | case VIRTIO_NET_HDR_GSO_TCPV4: |
317 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
318 | break; | |
296f96fc RR |
319 | case VIRTIO_NET_HDR_GSO_UDP: |
320 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
321 | break; | |
322 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
323 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
324 | break; | |
325 | default: | |
326 | if (net_ratelimit()) | |
327 | printk(KERN_WARNING "%s: bad gso type %u.\n", | |
b3f24698 | 328 | dev->name, hdr->hdr.gso_type); |
296f96fc RR |
329 | goto frame_err; |
330 | } | |
331 | ||
b3f24698 | 332 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
34a48579 RR |
333 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
334 | ||
b3f24698 | 335 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc RR |
336 | if (skb_shinfo(skb)->gso_size == 0) { |
337 | if (net_ratelimit()) | |
338 | printk(KERN_WARNING "%s: zero gso size.\n", | |
339 | dev->name); | |
340 | goto frame_err; | |
341 | } | |
342 | ||
343 | /* Header must be checked, and gso_segs computed. */ | |
344 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
345 | skb_shinfo(skb)->gso_segs = 0; | |
346 | } | |
347 | ||
348 | netif_receive_skb(skb); | |
349 | return; | |
350 | ||
351 | frame_err: | |
352 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
353 | dev_kfree_skb(skb); |
354 | } | |
355 | ||
9ab86bbc | 356 | static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp) |
296f96fc RR |
357 | { |
358 | struct sk_buff *skb; | |
9ab86bbc | 359 | struct skb_vnet_hdr *hdr; |
9ab86bbc | 360 | int err; |
3f2c31d9 | 361 | |
3464645a | 362 | skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp); |
9ab86bbc SM |
363 | if (unlikely(!skb)) |
364 | return -ENOMEM; | |
296f96fc | 365 | |
9ab86bbc | 366 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 367 | |
9ab86bbc | 368 | hdr = skb_vnet_hdr(skb); |
5e01d2f9 | 369 | sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr); |
97402b96 | 370 | |
5e01d2f9 | 371 | skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len); |
97402b96 | 372 | |
f96fde41 | 373 | err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp); |
9ab86bbc SM |
374 | if (err < 0) |
375 | dev_kfree_skb(skb); | |
97402b96 | 376 | |
9ab86bbc SM |
377 | return err; |
378 | } | |
97402b96 | 379 | |
9ab86bbc SM |
380 | static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp) |
381 | { | |
9ab86bbc SM |
382 | struct page *first, *list = NULL; |
383 | char *p; | |
384 | int i, err, offset; | |
385 | ||
5e01d2f9 | 386 | /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc SM |
387 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
388 | first = get_a_page(vi, gfp); | |
389 | if (!first) { | |
390 | if (list) | |
391 | give_pages(vi, list); | |
392 | return -ENOMEM; | |
97402b96 | 393 | } |
5e01d2f9 | 394 | sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 395 | |
9ab86bbc SM |
396 | /* chain new page in list head to match sg */ |
397 | first->private = (unsigned long)list; | |
398 | list = first; | |
399 | } | |
296f96fc | 400 | |
9ab86bbc SM |
401 | first = get_a_page(vi, gfp); |
402 | if (!first) { | |
403 | give_pages(vi, list); | |
404 | return -ENOMEM; | |
405 | } | |
406 | p = page_address(first); | |
407 | ||
5e01d2f9 MT |
408 | /* vi->rx_sg[0], vi->rx_sg[1] share the same page */ |
409 | /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */ | |
410 | sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr)); | |
9ab86bbc | 411 | |
5e01d2f9 | 412 | /* vi->rx_sg[1] for data packet, from offset */ |
9ab86bbc | 413 | offset = sizeof(struct padded_vnet_hdr); |
5e01d2f9 | 414 | sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
415 | |
416 | /* chain first in list head */ | |
417 | first->private = (unsigned long)list; | |
f96fde41 RR |
418 | err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2, |
419 | first, gfp); | |
9ab86bbc SM |
420 | if (err < 0) |
421 | give_pages(vi, first); | |
422 | ||
423 | return err; | |
296f96fc RR |
424 | } |
425 | ||
9ab86bbc | 426 | static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp) |
3f2c31d9 | 427 | { |
9ab86bbc | 428 | struct page *page; |
3f2c31d9 | 429 | int err; |
3f2c31d9 | 430 | |
9ab86bbc SM |
431 | page = get_a_page(vi, gfp); |
432 | if (!page) | |
433 | return -ENOMEM; | |
3f2c31d9 | 434 | |
5e01d2f9 | 435 | sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE); |
3f2c31d9 | 436 | |
f96fde41 | 437 | err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp); |
9ab86bbc SM |
438 | if (err < 0) |
439 | give_pages(vi, page); | |
3f2c31d9 | 440 | |
9ab86bbc SM |
441 | return err; |
442 | } | |
3f2c31d9 | 443 | |
b2baed69 RR |
444 | /* |
445 | * Returns false if we couldn't fill entirely (OOM). | |
446 | * | |
447 | * Normally run in the receive path, but can also be run from ndo_open | |
448 | * before we're receiving packets, or from refill_work which is | |
449 | * careful to disable receiving (using napi_disable). | |
450 | */ | |
9ab86bbc SM |
451 | static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) |
452 | { | |
453 | int err; | |
1788f495 | 454 | bool oom; |
3f2c31d9 | 455 | |
9ab86bbc SM |
456 | do { |
457 | if (vi->mergeable_rx_bufs) | |
458 | err = add_recvbuf_mergeable(vi, gfp); | |
459 | else if (vi->big_packets) | |
460 | err = add_recvbuf_big(vi, gfp); | |
461 | else | |
462 | err = add_recvbuf_small(vi, gfp); | |
3f2c31d9 | 463 | |
1788f495 MT |
464 | oom = err == -ENOMEM; |
465 | if (err < 0) | |
3f2c31d9 | 466 | break; |
9ab86bbc | 467 | ++vi->num; |
0aea51c3 | 468 | } while (err > 0); |
3f2c31d9 MM |
469 | if (unlikely(vi->num > vi->max)) |
470 | vi->max = vi->num; | |
1915a712 | 471 | virtqueue_kick(vi->rvq); |
3161e453 | 472 | return !oom; |
3f2c31d9 MM |
473 | } |
474 | ||
18445c4d | 475 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
476 | { |
477 | struct virtnet_info *vi = rvq->vdev->priv; | |
18445c4d | 478 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
288379f0 | 479 | if (napi_schedule_prep(&vi->napi)) { |
1915a712 | 480 | virtqueue_disable_cb(rvq); |
288379f0 | 481 | __napi_schedule(&vi->napi); |
18445c4d | 482 | } |
296f96fc RR |
483 | } |
484 | ||
3e9d08ec BR |
485 | static void virtnet_napi_enable(struct virtnet_info *vi) |
486 | { | |
487 | napi_enable(&vi->napi); | |
488 | ||
489 | /* If all buffers were filled by other side before we napi_enabled, we | |
490 | * won't get another interrupt, so process any outstanding packets | |
491 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
492 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
493 | if (napi_schedule_prep(&vi->napi)) { | |
494 | virtqueue_disable_cb(vi->rvq); | |
495 | __napi_schedule(&vi->napi); | |
496 | } | |
497 | } | |
498 | ||
3161e453 RR |
499 | static void refill_work(struct work_struct *work) |
500 | { | |
501 | struct virtnet_info *vi; | |
502 | bool still_empty; | |
503 | ||
504 | vi = container_of(work, struct virtnet_info, refill.work); | |
505 | napi_disable(&vi->napi); | |
39d32157 | 506 | still_empty = !try_fill_recv(vi, GFP_KERNEL); |
3e9d08ec | 507 | virtnet_napi_enable(vi); |
3161e453 RR |
508 | |
509 | /* In theory, this can happen: if we don't get any buffers in | |
510 | * we will *never* try to fill again. */ | |
511 | if (still_empty) | |
f1776dad | 512 | queue_delayed_work(system_nrt_wq, &vi->refill, HZ/2); |
3161e453 RR |
513 | } |
514 | ||
296f96fc RR |
515 | static int virtnet_poll(struct napi_struct *napi, int budget) |
516 | { | |
517 | struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); | |
9ab86bbc | 518 | void *buf; |
296f96fc RR |
519 | unsigned int len, received = 0; |
520 | ||
521 | again: | |
522 | while (received < budget && | |
1915a712 | 523 | (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) { |
9ab86bbc SM |
524 | receive_buf(vi->dev, buf, len); |
525 | --vi->num; | |
296f96fc RR |
526 | received++; |
527 | } | |
528 | ||
3161e453 RR |
529 | if (vi->num < vi->max / 2) { |
530 | if (!try_fill_recv(vi, GFP_ATOMIC)) | |
f1776dad | 531 | queue_delayed_work(system_nrt_wq, &vi->refill, 0); |
3161e453 | 532 | } |
296f96fc | 533 | |
8329d98e RR |
534 | /* Out of packets? */ |
535 | if (received < budget) { | |
288379f0 | 536 | napi_complete(napi); |
1915a712 | 537 | if (unlikely(!virtqueue_enable_cb(vi->rvq)) && |
8e95a202 | 538 | napi_schedule_prep(napi)) { |
1915a712 | 539 | virtqueue_disable_cb(vi->rvq); |
288379f0 | 540 | __napi_schedule(napi); |
296f96fc | 541 | goto again; |
4265f161 | 542 | } |
296f96fc RR |
543 | } |
544 | ||
545 | return received; | |
546 | } | |
547 | ||
48925e37 | 548 | static unsigned int free_old_xmit_skbs(struct virtnet_info *vi) |
296f96fc RR |
549 | { |
550 | struct sk_buff *skb; | |
48925e37 | 551 | unsigned int len, tot_sgs = 0; |
58472a76 | 552 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 553 | |
1915a712 | 554 | while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) { |
296f96fc | 555 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 556 | |
557 | u64_stats_update_begin(&stats->syncp); | |
558 | stats->tx_bytes += skb->len; | |
559 | stats->tx_packets++; | |
560 | u64_stats_update_end(&stats->syncp); | |
561 | ||
48925e37 | 562 | tot_sgs += skb_vnet_hdr(skb)->num_sg; |
ed79bab8 | 563 | dev_kfree_skb_any(skb); |
296f96fc | 564 | } |
48925e37 | 565 | return tot_sgs; |
296f96fc RR |
566 | } |
567 | ||
99ffc696 | 568 | static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) |
296f96fc | 569 | { |
b3f24698 | 570 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
296f96fc | 571 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
296f96fc | 572 | |
e174961c | 573 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 574 | |
296f96fc | 575 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 576 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
55508d60 | 577 | hdr->hdr.csum_start = skb_checksum_start_offset(skb); |
b3f24698 | 578 | hdr->hdr.csum_offset = skb->csum_offset; |
296f96fc | 579 | } else { |
b3f24698 RR |
580 | hdr->hdr.flags = 0; |
581 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
582 | } |
583 | ||
584 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
585 | hdr->hdr.hdr_len = skb_headlen(skb); |
586 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 587 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 588 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 589 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 590 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 591 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 592 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
593 | else |
594 | BUG(); | |
34a48579 | 595 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 596 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 597 | } else { |
b3f24698 RR |
598 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
599 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
600 | } |
601 | ||
b3f24698 | 602 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 MM |
603 | |
604 | /* Encode metadata header at front. */ | |
605 | if (vi->mergeable_rx_bufs) | |
5e01d2f9 | 606 | sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr); |
3f2c31d9 | 607 | else |
5e01d2f9 | 608 | sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr); |
3f2c31d9 | 609 | |
5e01d2f9 | 610 | hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1; |
1756ac3d | 611 | return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg, |
f96fde41 | 612 | 0, skb, GFP_ATOMIC); |
11a3a154 RR |
613 | } |
614 | ||
424efe9c | 615 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
616 | { |
617 | struct virtnet_info *vi = netdev_priv(dev); | |
48925e37 | 618 | int capacity; |
2cb9c6ba | 619 | |
2cb9c6ba RR |
620 | /* Free up any pending old buffers before queueing new ones. */ |
621 | free_old_xmit_skbs(vi); | |
99ffc696 | 622 | |
03f191ba | 623 | /* Try to transmit */ |
48925e37 RR |
624 | capacity = xmit_skb(vi, skb); |
625 | ||
626 | /* This can happen with OOM and indirect buffers. */ | |
627 | if (unlikely(capacity < 0)) { | |
58eba97d RR |
628 | if (net_ratelimit()) { |
629 | if (likely(capacity == -ENOMEM)) { | |
630 | dev_warn(&dev->dev, | |
631 | "TX queue failure: out of memory\n"); | |
632 | } else { | |
633 | dev->stats.tx_fifo_errors++; | |
634 | dev_warn(&dev->dev, | |
635 | "Unexpected TX queue failure: %d\n", | |
636 | capacity); | |
637 | } | |
48925e37 | 638 | } |
58eba97d RR |
639 | dev->stats.tx_dropped++; |
640 | kfree_skb(skb); | |
641 | return NETDEV_TX_OK; | |
296f96fc | 642 | } |
1915a712 | 643 | virtqueue_kick(vi->svq); |
03f191ba | 644 | |
48925e37 RR |
645 | /* Don't wait up for transmitted skbs to be freed. */ |
646 | skb_orphan(skb); | |
647 | nf_reset(skb); | |
648 | ||
649 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
650 | * before it gets out of hand. Naturally, this wastes entries. */ | |
651 | if (capacity < 2+MAX_SKB_FRAGS) { | |
652 | netif_stop_queue(dev); | |
7a66f784 | 653 | if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) { |
48925e37 RR |
654 | /* More just got used, free them then recheck. */ |
655 | capacity += free_old_xmit_skbs(vi); | |
656 | if (capacity >= 2+MAX_SKB_FRAGS) { | |
657 | netif_start_queue(dev); | |
1915a712 | 658 | virtqueue_disable_cb(vi->svq); |
48925e37 RR |
659 | } |
660 | } | |
99ffc696 | 661 | } |
48925e37 RR |
662 | |
663 | return NETDEV_TX_OK; | |
296f96fc RR |
664 | } |
665 | ||
9c46f6d4 AW |
666 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
667 | { | |
668 | struct virtnet_info *vi = netdev_priv(dev); | |
669 | struct virtio_device *vdev = vi->vdev; | |
670 | int ret; | |
671 | ||
672 | ret = eth_mac_addr(dev, p); | |
673 | if (ret) | |
674 | return ret; | |
675 | ||
62994b2d AW |
676 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
677 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), | |
678 | dev->dev_addr, dev->addr_len); | |
9c46f6d4 AW |
679 | |
680 | return 0; | |
681 | } | |
682 | ||
3fa2a1df | 683 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
684 | struct rtnl_link_stats64 *tot) | |
685 | { | |
686 | struct virtnet_info *vi = netdev_priv(dev); | |
687 | int cpu; | |
688 | unsigned int start; | |
689 | ||
690 | for_each_possible_cpu(cpu) { | |
58472a76 | 691 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 692 | u64 tpackets, tbytes, rpackets, rbytes; |
693 | ||
694 | do { | |
695 | start = u64_stats_fetch_begin(&stats->syncp); | |
696 | tpackets = stats->tx_packets; | |
697 | tbytes = stats->tx_bytes; | |
698 | rpackets = stats->rx_packets; | |
699 | rbytes = stats->rx_bytes; | |
700 | } while (u64_stats_fetch_retry(&stats->syncp, start)); | |
701 | ||
702 | tot->rx_packets += rpackets; | |
703 | tot->tx_packets += tpackets; | |
704 | tot->rx_bytes += rbytes; | |
705 | tot->tx_bytes += tbytes; | |
706 | } | |
707 | ||
708 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 709 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 710 | tot->rx_dropped = dev->stats.rx_dropped; |
711 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
712 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
713 | ||
714 | return tot; | |
715 | } | |
716 | ||
da74e89d AS |
717 | #ifdef CONFIG_NET_POLL_CONTROLLER |
718 | static void virtnet_netpoll(struct net_device *dev) | |
719 | { | |
720 | struct virtnet_info *vi = netdev_priv(dev); | |
721 | ||
722 | napi_schedule(&vi->napi); | |
723 | } | |
724 | #endif | |
725 | ||
296f96fc RR |
726 | static int virtnet_open(struct net_device *dev) |
727 | { | |
728 | struct virtnet_info *vi = netdev_priv(dev); | |
729 | ||
b2baed69 RR |
730 | /* Make sure we have some buffers: if oom use wq. */ |
731 | if (!try_fill_recv(vi, GFP_KERNEL)) | |
f1776dad | 732 | queue_delayed_work(system_nrt_wq, &vi->refill, 0); |
b2baed69 | 733 | |
3e9d08ec | 734 | virtnet_napi_enable(vi); |
296f96fc RR |
735 | return 0; |
736 | } | |
737 | ||
2a41f71d AW |
738 | /* |
739 | * Send command via the control virtqueue and check status. Commands | |
740 | * supported by the hypervisor, as indicated by feature bits, should | |
741 | * never fail unless improperly formated. | |
742 | */ | |
743 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
744 | struct scatterlist *data, int out, int in) | |
745 | { | |
23e258e1 | 746 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
2a41f71d AW |
747 | struct virtio_net_ctrl_hdr ctrl; |
748 | virtio_net_ctrl_ack status = ~0; | |
749 | unsigned int tmp; | |
23e258e1 | 750 | int i; |
2a41f71d | 751 | |
0ee904c3 AB |
752 | /* Caller should know better */ |
753 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || | |
754 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); | |
2a41f71d AW |
755 | |
756 | out++; /* Add header */ | |
757 | in++; /* Add return status */ | |
758 | ||
759 | ctrl.class = class; | |
760 | ctrl.cmd = cmd; | |
761 | ||
762 | sg_init_table(sg, out + in); | |
763 | ||
764 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); | |
23e258e1 AW |
765 | for_each_sg(data, s, out + in - 2, i) |
766 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); | |
2a41f71d AW |
767 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
768 | ||
f96fde41 | 769 | BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0); |
2a41f71d | 770 | |
1915a712 | 771 | virtqueue_kick(vi->cvq); |
2a41f71d AW |
772 | |
773 | /* | |
774 | * Spin for a response, the kick causes an ioport write, trapping | |
775 | * into the hypervisor, so the request should be handled immediately. | |
776 | */ | |
1915a712 | 777 | while (!virtqueue_get_buf(vi->cvq, &tmp)) |
2a41f71d AW |
778 | cpu_relax(); |
779 | ||
780 | return status == VIRTIO_NET_OK; | |
781 | } | |
782 | ||
296f96fc RR |
783 | static int virtnet_close(struct net_device *dev) |
784 | { | |
785 | struct virtnet_info *vi = netdev_priv(dev); | |
296f96fc | 786 | |
b2baed69 RR |
787 | /* Make sure refill_work doesn't re-enable napi! */ |
788 | cancel_delayed_work_sync(&vi->refill); | |
296f96fc RR |
789 | napi_disable(&vi->napi); |
790 | ||
296f96fc RR |
791 | return 0; |
792 | } | |
793 | ||
2af7698e AW |
794 | static void virtnet_set_rx_mode(struct net_device *dev) |
795 | { | |
796 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 797 | struct scatterlist sg[2]; |
2af7698e | 798 | u8 promisc, allmulti; |
f565a7c2 | 799 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 800 | struct netdev_hw_addr *ha; |
32e7bfc4 | 801 | int uc_count; |
4cd24eaf | 802 | int mc_count; |
f565a7c2 AW |
803 | void *buf; |
804 | int i; | |
2af7698e AW |
805 | |
806 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
807 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
808 | return; | |
809 | ||
f565a7c2 AW |
810 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
811 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 812 | |
23e258e1 | 813 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
814 | |
815 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
816 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f565a7c2 | 817 | sg, 1, 0)) |
2af7698e AW |
818 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
819 | promisc ? "en" : "dis"); | |
820 | ||
23e258e1 | 821 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
822 | |
823 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
824 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f565a7c2 | 825 | sg, 1, 0)) |
2af7698e AW |
826 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
827 | allmulti ? "en" : "dis"); | |
f565a7c2 | 828 | |
32e7bfc4 | 829 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 830 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 831 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
832 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
833 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
834 | mac_data = buf; | |
f565a7c2 AW |
835 | if (!buf) { |
836 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); | |
837 | return; | |
838 | } | |
839 | ||
23e258e1 AW |
840 | sg_init_table(sg, 2); |
841 | ||
f565a7c2 | 842 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 843 | mac_data->entries = uc_count; |
ccffad25 | 844 | i = 0; |
32e7bfc4 | 845 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 846 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
847 | |
848 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 849 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
850 | |
851 | /* multicast list and count fill the end */ | |
32e7bfc4 | 852 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 853 | |
4cd24eaf | 854 | mac_data->entries = mc_count; |
567ec874 | 855 | i = 0; |
22bedad3 JP |
856 | netdev_for_each_mc_addr(ha, dev) |
857 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
858 | |
859 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 860 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
861 | |
862 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
863 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
864 | sg, 2, 0)) | |
865 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); | |
866 | ||
867 | kfree(buf); | |
2af7698e AW |
868 | } |
869 | ||
8e586137 | 870 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
871 | { |
872 | struct virtnet_info *vi = netdev_priv(dev); | |
873 | struct scatterlist sg; | |
874 | ||
23e258e1 | 875 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
876 | |
877 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
878 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) | |
879 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); | |
8e586137 | 880 | return 0; |
0bde9569 AW |
881 | } |
882 | ||
8e586137 | 883 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
884 | { |
885 | struct virtnet_info *vi = netdev_priv(dev); | |
886 | struct scatterlist sg; | |
887 | ||
23e258e1 | 888 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
889 | |
890 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
891 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) | |
892 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); | |
8e586137 | 893 | return 0; |
0bde9569 AW |
894 | } |
895 | ||
8f9f4668 RJ |
896 | static void virtnet_get_ringparam(struct net_device *dev, |
897 | struct ethtool_ringparam *ring) | |
898 | { | |
899 | struct virtnet_info *vi = netdev_priv(dev); | |
900 | ||
901 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq); | |
902 | ring->tx_max_pending = virtqueue_get_vring_size(vi->svq); | |
903 | ring->rx_pending = ring->rx_max_pending; | |
904 | ring->tx_pending = ring->tx_max_pending; | |
905 | ||
906 | } | |
907 | ||
66846048 RJ |
908 | |
909 | static void virtnet_get_drvinfo(struct net_device *dev, | |
910 | struct ethtool_drvinfo *info) | |
911 | { | |
912 | struct virtnet_info *vi = netdev_priv(dev); | |
913 | struct virtio_device *vdev = vi->vdev; | |
914 | ||
915 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
916 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
917 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
918 | ||
919 | } | |
920 | ||
0fc0b732 | 921 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 922 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 923 | .get_link = ethtool_op_get_link, |
8f9f4668 | 924 | .get_ringparam = virtnet_get_ringparam, |
a9ea3fc6 HX |
925 | }; |
926 | ||
39da5814 MM |
927 | #define MIN_MTU 68 |
928 | #define MAX_MTU 65535 | |
929 | ||
930 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
931 | { | |
932 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
933 | return -EINVAL; | |
934 | dev->mtu = new_mtu; | |
935 | return 0; | |
936 | } | |
937 | ||
76288b4e SH |
938 | static const struct net_device_ops virtnet_netdev = { |
939 | .ndo_open = virtnet_open, | |
940 | .ndo_stop = virtnet_close, | |
941 | .ndo_start_xmit = start_xmit, | |
942 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 943 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 944 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 945 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 946 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
947 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
948 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
949 | #ifdef CONFIG_NET_POLL_CONTROLLER |
950 | .ndo_poll_controller = virtnet_netpoll, | |
951 | #endif | |
952 | }; | |
953 | ||
9f4d26d0 MM |
954 | static void virtnet_update_status(struct virtnet_info *vi) |
955 | { | |
956 | u16 v; | |
957 | ||
77dd7693 | 958 | if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS, |
9f4d26d0 | 959 | offsetof(struct virtio_net_config, status), |
77dd7693 SL |
960 | &v) < 0) |
961 | return; | |
9f4d26d0 MM |
962 | |
963 | /* Ignore unknown (future) status bits */ | |
964 | v &= VIRTIO_NET_S_LINK_UP; | |
965 | ||
966 | if (vi->status == v) | |
967 | return; | |
968 | ||
969 | vi->status = v; | |
970 | ||
971 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
972 | netif_carrier_on(vi->dev); | |
973 | netif_wake_queue(vi->dev); | |
974 | } else { | |
975 | netif_carrier_off(vi->dev); | |
976 | netif_stop_queue(vi->dev); | |
977 | } | |
978 | } | |
979 | ||
980 | static void virtnet_config_changed(struct virtio_device *vdev) | |
981 | { | |
982 | struct virtnet_info *vi = vdev->priv; | |
983 | ||
984 | virtnet_update_status(vi); | |
985 | } | |
986 | ||
3f9c10b0 AS |
987 | static int init_vqs(struct virtnet_info *vi) |
988 | { | |
989 | struct virtqueue *vqs[3]; | |
990 | vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; | |
991 | const char *names[] = { "input", "output", "control" }; | |
992 | int nvqs, err; | |
993 | ||
994 | /* We expect two virtqueues, receive then send, | |
995 | * and optionally control. */ | |
996 | nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; | |
997 | ||
998 | err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names); | |
999 | if (err) | |
1000 | return err; | |
1001 | ||
1002 | vi->rvq = vqs[0]; | |
1003 | vi->svq = vqs[1]; | |
1004 | ||
1005 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { | |
1006 | vi->cvq = vqs[2]; | |
1007 | ||
1008 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) | |
1009 | vi->dev->features |= NETIF_F_HW_VLAN_FILTER; | |
1010 | } | |
1011 | return 0; | |
1012 | } | |
1013 | ||
296f96fc RR |
1014 | static int virtnet_probe(struct virtio_device *vdev) |
1015 | { | |
1016 | int err; | |
296f96fc RR |
1017 | struct net_device *dev; |
1018 | struct virtnet_info *vi; | |
296f96fc RR |
1019 | |
1020 | /* Allocate ourselves a network device with room for our info */ | |
1021 | dev = alloc_etherdev(sizeof(struct virtnet_info)); | |
1022 | if (!dev) | |
1023 | return -ENOMEM; | |
1024 | ||
1025 | /* Set up network device as normal. */ | |
01789349 | 1026 | dev->priv_flags |= IFF_UNICAST_FLT; |
76288b4e | 1027 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1028 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1029 | |
a9ea3fc6 | 1030 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
1031 | SET_NETDEV_DEV(dev, &vdev->dev); |
1032 | ||
1033 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1034 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1035 | /* This opens up the world of extra features. */ |
98e778c9 MM |
1036 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
1037 | if (csum) | |
1038 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1039 | ||
1040 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
1041 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO | |
34a48579 RR |
1042 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1043 | } | |
5539ae96 | 1044 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1045 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1046 | dev->hw_features |= NETIF_F_TSO; | |
1047 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1048 | dev->hw_features |= NETIF_F_TSO6; | |
1049 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1050 | dev->hw_features |= NETIF_F_TSO_ECN; | |
1051 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) | |
1052 | dev->hw_features |= NETIF_F_UFO; | |
1053 | ||
1054 | if (gso) | |
1055 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); | |
1056 | /* (!csum && gso) case will be fixed by register_netdev() */ | |
296f96fc RR |
1057 | } |
1058 | ||
1059 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
77dd7693 | 1060 | if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC, |
a586d4f6 | 1061 | offsetof(struct virtio_net_config, mac), |
77dd7693 | 1062 | dev->dev_addr, dev->addr_len) < 0) |
f2cedb63 | 1063 | eth_hw_addr_random(dev); |
296f96fc RR |
1064 | |
1065 | /* Set up our device-specific information */ | |
1066 | vi = netdev_priv(dev); | |
6c0cd7c0 | 1067 | netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); |
296f96fc RR |
1068 | vi->dev = dev; |
1069 | vi->vdev = vdev; | |
d9d5dcc8 | 1070 | vdev->priv = vi; |
fb6813f4 | 1071 | vi->pages = NULL; |
3fa2a1df | 1072 | vi->stats = alloc_percpu(struct virtnet_stats); |
1073 | err = -ENOMEM; | |
1074 | if (vi->stats == NULL) | |
1075 | goto free; | |
1076 | ||
3161e453 | 1077 | INIT_DELAYED_WORK(&vi->refill, refill_work); |
5e01d2f9 MT |
1078 | sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg)); |
1079 | sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg)); | |
296f96fc | 1080 | |
97402b96 | 1081 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1082 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1083 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
1084 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
97402b96 HX |
1085 | vi->big_packets = true; |
1086 | ||
3f2c31d9 MM |
1087 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1088 | vi->mergeable_rx_bufs = true; | |
1089 | ||
3f9c10b0 | 1090 | err = init_vqs(vi); |
d2a7ddda | 1091 | if (err) |
3fa2a1df | 1092 | goto free_stats; |
296f96fc | 1093 | |
296f96fc RR |
1094 | err = register_netdev(dev); |
1095 | if (err) { | |
1096 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1097 | goto free_vqs; |
296f96fc | 1098 | } |
b3369c1f RR |
1099 | |
1100 | /* Last of all, set up some receive buffers. */ | |
3161e453 | 1101 | try_fill_recv(vi, GFP_KERNEL); |
b3369c1f RR |
1102 | |
1103 | /* If we didn't even get one input buffer, we're useless. */ | |
1104 | if (vi->num == 0) { | |
1105 | err = -ENOMEM; | |
1106 | goto unregister; | |
1107 | } | |
1108 | ||
167c25e4 JW |
1109 | /* Assume link up if device can't report link status, |
1110 | otherwise get link status from config. */ | |
1111 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1112 | netif_carrier_off(dev); | |
1113 | virtnet_update_status(vi); | |
1114 | } else { | |
1115 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1116 | netif_carrier_on(dev); | |
1117 | } | |
9f4d26d0 | 1118 | |
296f96fc | 1119 | pr_debug("virtnet: registered device %s\n", dev->name); |
296f96fc RR |
1120 | return 0; |
1121 | ||
b3369c1f RR |
1122 | unregister: |
1123 | unregister_netdev(dev); | |
d2a7ddda MT |
1124 | free_vqs: |
1125 | vdev->config->del_vqs(vdev); | |
3fa2a1df | 1126 | free_stats: |
1127 | free_percpu(vi->stats); | |
296f96fc RR |
1128 | free: |
1129 | free_netdev(dev); | |
1130 | return err; | |
1131 | } | |
1132 | ||
9ab86bbc SM |
1133 | static void free_unused_bufs(struct virtnet_info *vi) |
1134 | { | |
1135 | void *buf; | |
830a8a97 | 1136 | while (1) { |
1915a712 | 1137 | buf = virtqueue_detach_unused_buf(vi->svq); |
830a8a97 SM |
1138 | if (!buf) |
1139 | break; | |
1140 | dev_kfree_skb(buf); | |
1141 | } | |
9ab86bbc | 1142 | while (1) { |
1915a712 | 1143 | buf = virtqueue_detach_unused_buf(vi->rvq); |
9ab86bbc SM |
1144 | if (!buf) |
1145 | break; | |
1146 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
1147 | give_pages(vi, buf); | |
1148 | else | |
1149 | dev_kfree_skb(buf); | |
1150 | --vi->num; | |
1151 | } | |
1152 | BUG_ON(vi->num != 0); | |
1153 | } | |
1154 | ||
04486ed0 | 1155 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1156 | { |
04486ed0 | 1157 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1158 | |
1159 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1160 | free_unused_bufs(vi); |
fb6813f4 | 1161 | |
04486ed0 | 1162 | vi->vdev->config->del_vqs(vi->vdev); |
d2a7ddda | 1163 | |
fb6813f4 RR |
1164 | while (vi->pages) |
1165 | __free_pages(get_a_page(vi, GFP_KERNEL), 0); | |
04486ed0 AS |
1166 | } |
1167 | ||
1168 | static void __devexit virtnet_remove(struct virtio_device *vdev) | |
1169 | { | |
1170 | struct virtnet_info *vi = vdev->priv; | |
1171 | ||
1172 | unregister_netdev(vi->dev); | |
1173 | ||
1174 | remove_vq_common(vi); | |
fb6813f4 | 1175 | |
2e66f55b | 1176 | free_percpu(vi->stats); |
74b2553f | 1177 | free_netdev(vi->dev); |
296f96fc RR |
1178 | } |
1179 | ||
0741bcb5 AS |
1180 | #ifdef CONFIG_PM |
1181 | static int virtnet_freeze(struct virtio_device *vdev) | |
1182 | { | |
1183 | struct virtnet_info *vi = vdev->priv; | |
1184 | ||
1185 | virtqueue_disable_cb(vi->rvq); | |
1186 | virtqueue_disable_cb(vi->svq); | |
1187 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) | |
1188 | virtqueue_disable_cb(vi->cvq); | |
1189 | ||
1190 | netif_device_detach(vi->dev); | |
1191 | cancel_delayed_work_sync(&vi->refill); | |
1192 | ||
1193 | if (netif_running(vi->dev)) | |
1194 | napi_disable(&vi->napi); | |
1195 | ||
1196 | remove_vq_common(vi); | |
1197 | ||
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | static int virtnet_restore(struct virtio_device *vdev) | |
1202 | { | |
1203 | struct virtnet_info *vi = vdev->priv; | |
1204 | int err; | |
1205 | ||
1206 | err = init_vqs(vi); | |
1207 | if (err) | |
1208 | return err; | |
1209 | ||
1210 | if (netif_running(vi->dev)) | |
1211 | virtnet_napi_enable(vi); | |
1212 | ||
1213 | netif_device_attach(vi->dev); | |
1214 | ||
1215 | if (!try_fill_recv(vi, GFP_KERNEL)) | |
1216 | queue_delayed_work(system_nrt_wq, &vi->refill, 0); | |
1217 | ||
1218 | return 0; | |
1219 | } | |
1220 | #endif | |
1221 | ||
296f96fc RR |
1222 | static struct virtio_device_id id_table[] = { |
1223 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1224 | { 0 }, | |
1225 | }; | |
1226 | ||
c45a6816 | 1227 | static unsigned int features[] = { |
5e4fe5c4 MM |
1228 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1229 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1230 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1231 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1232 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1233 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1234 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
c45a6816 RR |
1235 | }; |
1236 | ||
22402529 | 1237 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1238 | .feature_table = features, |
1239 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1240 | .driver.name = KBUILD_MODNAME, |
1241 | .driver.owner = THIS_MODULE, | |
1242 | .id_table = id_table, | |
1243 | .probe = virtnet_probe, | |
1244 | .remove = __devexit_p(virtnet_remove), | |
9f4d26d0 | 1245 | .config_changed = virtnet_config_changed, |
0741bcb5 AS |
1246 | #ifdef CONFIG_PM |
1247 | .freeze = virtnet_freeze, | |
1248 | .restore = virtnet_restore, | |
1249 | #endif | |
296f96fc RR |
1250 | }; |
1251 | ||
1252 | static int __init init(void) | |
1253 | { | |
22402529 | 1254 | return register_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1255 | } |
1256 | ||
1257 | static void __exit fini(void) | |
1258 | { | |
22402529 | 1259 | unregister_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1260 | } |
1261 | module_init(init); | |
1262 | module_exit(fini); | |
1263 | ||
1264 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1265 | MODULE_DESCRIPTION("Virtio network driver"); | |
1266 | MODULE_LICENSE("GPL"); |