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Commit | Line | Data |
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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 | |
adf8d3ff | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
296f96fc RR |
17 | */ |
18 | //#define DEBUG | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 21 | #include <linux/ethtool.h> |
296f96fc RR |
22 | #include <linux/module.h> |
23 | #include <linux/virtio.h> | |
24 | #include <linux/virtio_net.h> | |
25 | #include <linux/scatterlist.h> | |
e918085a | 26 | #include <linux/if_vlan.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
8de4b2f3 | 28 | #include <linux/cpu.h> |
ab7db917 | 29 | #include <linux/average.h> |
91815639 | 30 | #include <net/busy_poll.h> |
296f96fc | 31 | |
d34710e3 | 32 | static int napi_weight = NAPI_POLL_WEIGHT; |
6c0cd7c0 DL |
33 | module_param(napi_weight, int, 0444); |
34 | ||
eb939922 | 35 | static bool csum = true, gso = true; |
34a48579 RR |
36 | module_param(csum, bool, 0444); |
37 | module_param(gso, bool, 0444); | |
38 | ||
296f96fc | 39 | /* FIXME: MTU in config. */ |
5061de36 | 40 | #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 41 | #define GOOD_COPY_LEN 128 |
296f96fc | 42 | |
ab7db917 MD |
43 | /* Weight used for the RX packet size EWMA. The average packet size is used to |
44 | * determine the packet buffer size when refilling RX rings. As the entire RX | |
45 | * ring may be refilled at once, the weight is chosen so that the EWMA will be | |
46 | * insensitive to short-term, transient changes in packet size. | |
47 | */ | |
48 | #define RECEIVE_AVG_WEIGHT 64 | |
49 | ||
50 | /* Minimum alignment for mergeable packet buffers. */ | |
51 | #define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, 256) | |
52 | ||
66846048 | 53 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 54 | |
3fa2a1df | 55 | struct virtnet_stats { |
83a27052 ED |
56 | struct u64_stats_sync tx_syncp; |
57 | struct u64_stats_sync rx_syncp; | |
3fa2a1df | 58 | u64 tx_bytes; |
59 | u64 tx_packets; | |
60 | ||
61 | u64 rx_bytes; | |
62 | u64 rx_packets; | |
63 | }; | |
64 | ||
e9d7417b JW |
65 | /* Internal representation of a send virtqueue */ |
66 | struct send_queue { | |
67 | /* Virtqueue associated with this send _queue */ | |
68 | struct virtqueue *vq; | |
69 | ||
70 | /* TX: fragments + linear part + virtio header */ | |
71 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
72 | |
73 | /* Name of the send queue: output.$index */ | |
74 | char name[40]; | |
e9d7417b JW |
75 | }; |
76 | ||
77 | /* Internal representation of a receive virtqueue */ | |
78 | struct receive_queue { | |
79 | /* Virtqueue associated with this receive_queue */ | |
80 | struct virtqueue *vq; | |
81 | ||
296f96fc RR |
82 | struct napi_struct napi; |
83 | ||
e9d7417b JW |
84 | /* Chain pages by the private ptr. */ |
85 | struct page *pages; | |
86 | ||
ab7db917 MD |
87 | /* Average packet length for mergeable receive buffers. */ |
88 | struct ewma mrg_avg_pkt_len; | |
89 | ||
fb51879d MD |
90 | /* Page frag for packet buffer allocation. */ |
91 | struct page_frag alloc_frag; | |
92 | ||
e9d7417b JW |
93 | /* RX: fragments + linear part + virtio header */ |
94 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
95 | |
96 | /* Name of this receive queue: input.$index */ | |
97 | char name[40]; | |
e9d7417b JW |
98 | }; |
99 | ||
100 | struct virtnet_info { | |
101 | struct virtio_device *vdev; | |
102 | struct virtqueue *cvq; | |
103 | struct net_device *dev; | |
986a4f4d JW |
104 | struct send_queue *sq; |
105 | struct receive_queue *rq; | |
e9d7417b JW |
106 | unsigned int status; |
107 | ||
986a4f4d JW |
108 | /* Max # of queue pairs supported by the device */ |
109 | u16 max_queue_pairs; | |
110 | ||
111 | /* # of queue pairs currently used by the driver */ | |
112 | u16 curr_queue_pairs; | |
113 | ||
97402b96 HX |
114 | /* I like... big packets and I cannot lie! */ |
115 | bool big_packets; | |
116 | ||
3f2c31d9 MM |
117 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
118 | bool mergeable_rx_bufs; | |
119 | ||
986a4f4d JW |
120 | /* Has control virtqueue */ |
121 | bool has_cvq; | |
122 | ||
e7428e95 MT |
123 | /* Host can handle any s/g split between our header and packet data */ |
124 | bool any_header_sg; | |
125 | ||
3fa2a1df | 126 | /* Active statistics */ |
127 | struct virtnet_stats __percpu *stats; | |
128 | ||
3161e453 RR |
129 | /* Work struct for refilling if we run low on memory. */ |
130 | struct delayed_work refill; | |
131 | ||
586d17c5 JW |
132 | /* Work struct for config space updates */ |
133 | struct work_struct config_work; | |
134 | ||
986a4f4d JW |
135 | /* Does the affinity hint is set for virtqueues? */ |
136 | bool affinity_hint_set; | |
47be2479 | 137 | |
8de4b2f3 WG |
138 | /* CPU hot plug notifier */ |
139 | struct notifier_block nb; | |
296f96fc RR |
140 | }; |
141 | ||
b3f24698 RR |
142 | struct skb_vnet_hdr { |
143 | union { | |
144 | struct virtio_net_hdr hdr; | |
145 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
146 | }; | |
147 | }; | |
148 | ||
9ab86bbc SM |
149 | struct padded_vnet_hdr { |
150 | struct virtio_net_hdr hdr; | |
151 | /* | |
152 | * virtio_net_hdr should be in a separated sg buffer because of a | |
153 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
154 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
155 | */ | |
156 | char padding[6]; | |
157 | }; | |
158 | ||
986a4f4d JW |
159 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
160 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
161 | */ | |
162 | static int vq2txq(struct virtqueue *vq) | |
163 | { | |
9d0ca6ed | 164 | return (vq->index - 1) / 2; |
986a4f4d JW |
165 | } |
166 | ||
167 | static int txq2vq(int txq) | |
168 | { | |
169 | return txq * 2 + 1; | |
170 | } | |
171 | ||
172 | static int vq2rxq(struct virtqueue *vq) | |
173 | { | |
9d0ca6ed | 174 | return vq->index / 2; |
986a4f4d JW |
175 | } |
176 | ||
177 | static int rxq2vq(int rxq) | |
178 | { | |
179 | return rxq * 2; | |
180 | } | |
181 | ||
b3f24698 | 182 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 183 | { |
b3f24698 | 184 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
185 | } |
186 | ||
9ab86bbc SM |
187 | /* |
188 | * private is used to chain pages for big packets, put the whole | |
189 | * most recent used list in the beginning for reuse | |
190 | */ | |
e9d7417b | 191 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 192 | { |
9ab86bbc | 193 | struct page *end; |
0a888fd1 | 194 | |
e9d7417b | 195 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 196 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
197 | end->private = (unsigned long)rq->pages; |
198 | rq->pages = page; | |
0a888fd1 MM |
199 | } |
200 | ||
e9d7417b | 201 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 202 | { |
e9d7417b | 203 | struct page *p = rq->pages; |
fb6813f4 | 204 | |
9ab86bbc | 205 | if (p) { |
e9d7417b | 206 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
207 | /* clear private here, it is used to chain pages */ |
208 | p->private = 0; | |
209 | } else | |
fb6813f4 RR |
210 | p = alloc_page(gfp_mask); |
211 | return p; | |
212 | } | |
213 | ||
e9d7417b | 214 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 215 | { |
e9d7417b | 216 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 217 | |
2cb9c6ba | 218 | /* Suppress further interrupts. */ |
e9d7417b | 219 | virtqueue_disable_cb(vq); |
11a3a154 | 220 | |
363f1514 | 221 | /* We were probably waiting for more output buffers. */ |
986a4f4d | 222 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
296f96fc RR |
223 | } |
224 | ||
ab7db917 MD |
225 | static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) |
226 | { | |
227 | unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); | |
228 | return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; | |
229 | } | |
230 | ||
231 | static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) | |
232 | { | |
233 | return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); | |
234 | ||
235 | } | |
236 | ||
237 | static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) | |
238 | { | |
239 | unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; | |
240 | return (unsigned long)buf | (size - 1); | |
241 | } | |
242 | ||
3464645a | 243 | /* Called from bottom half context */ |
e9d7417b | 244 | static struct sk_buff *page_to_skb(struct receive_queue *rq, |
2613af0e MD |
245 | struct page *page, unsigned int offset, |
246 | unsigned int len, unsigned int truesize) | |
9ab86bbc | 247 | { |
e9d7417b | 248 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc SM |
249 | struct sk_buff *skb; |
250 | struct skb_vnet_hdr *hdr; | |
2613af0e | 251 | unsigned int copy, hdr_len, hdr_padded_len; |
9ab86bbc | 252 | char *p; |
fb6813f4 | 253 | |
2613af0e | 254 | p = page_address(page) + offset; |
3f2c31d9 | 255 | |
9ab86bbc SM |
256 | /* copy small packet so we can reuse these pages for small data */ |
257 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
258 | if (unlikely(!skb)) | |
259 | return NULL; | |
3f2c31d9 | 260 | |
9ab86bbc | 261 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 262 | |
9ab86bbc SM |
263 | if (vi->mergeable_rx_bufs) { |
264 | hdr_len = sizeof hdr->mhdr; | |
2613af0e | 265 | hdr_padded_len = sizeof hdr->mhdr; |
9ab86bbc SM |
266 | } else { |
267 | hdr_len = sizeof hdr->hdr; | |
2613af0e | 268 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
9ab86bbc | 269 | } |
3f2c31d9 | 270 | |
9ab86bbc | 271 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 272 | |
9ab86bbc | 273 | len -= hdr_len; |
2613af0e MD |
274 | offset += hdr_padded_len; |
275 | p += hdr_padded_len; | |
3f2c31d9 | 276 | |
9ab86bbc SM |
277 | copy = len; |
278 | if (copy > skb_tailroom(skb)) | |
279 | copy = skb_tailroom(skb); | |
280 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 281 | |
9ab86bbc SM |
282 | len -= copy; |
283 | offset += copy; | |
3f2c31d9 | 284 | |
2613af0e MD |
285 | if (vi->mergeable_rx_bufs) { |
286 | if (len) | |
287 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); | |
288 | else | |
289 | put_page(page); | |
290 | return skb; | |
291 | } | |
292 | ||
e878d78b SL |
293 | /* |
294 | * Verify that we can indeed put this data into a skb. | |
295 | * This is here to handle cases when the device erroneously | |
296 | * tries to receive more than is possible. This is usually | |
297 | * the case of a broken device. | |
298 | */ | |
299 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 300 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
301 | dev_kfree_skb(skb); |
302 | return NULL; | |
303 | } | |
2613af0e | 304 | BUG_ON(offset >= PAGE_SIZE); |
9ab86bbc | 305 | while (len) { |
2613af0e MD |
306 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
307 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, | |
308 | frag_size, truesize); | |
309 | len -= frag_size; | |
9ab86bbc SM |
310 | page = (struct page *)page->private; |
311 | offset = 0; | |
312 | } | |
3f2c31d9 | 313 | |
9ab86bbc | 314 | if (page) |
e9d7417b | 315 | give_pages(rq, page); |
3f2c31d9 | 316 | |
9ab86bbc SM |
317 | return skb; |
318 | } | |
3f2c31d9 | 319 | |
f121159d MT |
320 | static struct sk_buff *receive_small(void *buf, unsigned int len) |
321 | { | |
322 | struct sk_buff * skb = buf; | |
323 | ||
324 | len -= sizeof(struct virtio_net_hdr); | |
325 | skb_trim(skb, len); | |
326 | ||
327 | return skb; | |
328 | } | |
329 | ||
330 | static struct sk_buff *receive_big(struct net_device *dev, | |
331 | struct receive_queue *rq, | |
332 | void *buf, | |
333 | unsigned int len) | |
334 | { | |
335 | struct page *page = buf; | |
336 | struct sk_buff *skb = page_to_skb(rq, page, 0, len, PAGE_SIZE); | |
337 | ||
338 | if (unlikely(!skb)) | |
339 | goto err; | |
340 | ||
341 | return skb; | |
342 | ||
343 | err: | |
344 | dev->stats.rx_dropped++; | |
345 | give_pages(rq, page); | |
346 | return NULL; | |
347 | } | |
348 | ||
8fc3b9e9 MT |
349 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
350 | struct receive_queue *rq, | |
ab7db917 | 351 | unsigned long ctx, |
8fc3b9e9 | 352 | unsigned int len) |
9ab86bbc | 353 | { |
ab7db917 | 354 | void *buf = mergeable_ctx_to_buf_address(ctx); |
8fc3b9e9 MT |
355 | struct skb_vnet_hdr *hdr = buf; |
356 | int num_buf = hdr->mhdr.num_buffers; | |
357 | struct page *page = virt_to_head_page(buf); | |
358 | int offset = buf - page_address(page); | |
ab7db917 MD |
359 | unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
360 | ||
fb51879d | 361 | struct sk_buff *head_skb = page_to_skb(rq, page, offset, len, truesize); |
2613af0e | 362 | struct sk_buff *curr_skb = head_skb; |
9ab86bbc | 363 | |
8fc3b9e9 MT |
364 | if (unlikely(!curr_skb)) |
365 | goto err_skb; | |
9ab86bbc | 366 | while (--num_buf) { |
8fc3b9e9 MT |
367 | int num_skb_frags; |
368 | ||
ab7db917 MD |
369 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
370 | if (unlikely(!ctx)) { | |
8fc3b9e9 MT |
371 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
372 | dev->name, num_buf, hdr->mhdr.num_buffers); | |
373 | dev->stats.rx_length_errors++; | |
374 | goto err_buf; | |
3f2c31d9 | 375 | } |
8fc3b9e9 | 376 | |
ab7db917 | 377 | buf = mergeable_ctx_to_buf_address(ctx); |
8fc3b9e9 | 378 | page = virt_to_head_page(buf); |
8fc3b9e9 MT |
379 | |
380 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; | |
2613af0e MD |
381 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
382 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
8fc3b9e9 MT |
383 | |
384 | if (unlikely(!nskb)) | |
385 | goto err_skb; | |
2613af0e MD |
386 | if (curr_skb == head_skb) |
387 | skb_shinfo(curr_skb)->frag_list = nskb; | |
388 | else | |
389 | curr_skb->next = nskb; | |
390 | curr_skb = nskb; | |
391 | head_skb->truesize += nskb->truesize; | |
392 | num_skb_frags = 0; | |
393 | } | |
ab7db917 | 394 | truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
2613af0e MD |
395 | if (curr_skb != head_skb) { |
396 | head_skb->data_len += len; | |
397 | head_skb->len += len; | |
fb51879d | 398 | head_skb->truesize += truesize; |
2613af0e | 399 | } |
8fc3b9e9 | 400 | offset = buf - page_address(page); |
ba275241 JW |
401 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
402 | put_page(page); | |
403 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
fb51879d | 404 | len, truesize); |
ba275241 JW |
405 | } else { |
406 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
fb51879d | 407 | offset, len, truesize); |
ba275241 | 408 | } |
8fc3b9e9 MT |
409 | } |
410 | ||
ab7db917 | 411 | ewma_add(&rq->mrg_avg_pkt_len, head_skb->len); |
8fc3b9e9 MT |
412 | return head_skb; |
413 | ||
414 | err_skb: | |
415 | put_page(page); | |
416 | while (--num_buf) { | |
ab7db917 MD |
417 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
418 | if (unlikely(!ctx)) { | |
8fc3b9e9 MT |
419 | pr_debug("%s: rx error: %d buffers missing\n", |
420 | dev->name, num_buf); | |
421 | dev->stats.rx_length_errors++; | |
422 | break; | |
423 | } | |
ab7db917 | 424 | page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); |
8fc3b9e9 | 425 | put_page(page); |
9ab86bbc | 426 | } |
8fc3b9e9 MT |
427 | err_buf: |
428 | dev->stats.rx_dropped++; | |
429 | dev_kfree_skb(head_skb); | |
430 | return NULL; | |
9ab86bbc SM |
431 | } |
432 | ||
e9d7417b | 433 | static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) |
9ab86bbc | 434 | { |
e9d7417b JW |
435 | struct virtnet_info *vi = rq->vq->vdev->priv; |
436 | struct net_device *dev = vi->dev; | |
58472a76 | 437 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc | 438 | struct sk_buff *skb; |
9ab86bbc | 439 | struct skb_vnet_hdr *hdr; |
3f2c31d9 | 440 | |
9ab86bbc SM |
441 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
442 | pr_debug("%s: short packet %i\n", dev->name, len); | |
443 | dev->stats.rx_length_errors++; | |
ab7db917 MD |
444 | if (vi->mergeable_rx_bufs) { |
445 | unsigned long ctx = (unsigned long)buf; | |
446 | void *base = mergeable_ctx_to_buf_address(ctx); | |
447 | put_page(virt_to_head_page(base)); | |
448 | } else if (vi->big_packets) { | |
98bfd23c | 449 | give_pages(rq, buf); |
ab7db917 | 450 | } else { |
9ab86bbc | 451 | dev_kfree_skb(buf); |
ab7db917 | 452 | } |
9ab86bbc SM |
453 | return; |
454 | } | |
3f2c31d9 | 455 | |
f121159d | 456 | if (vi->mergeable_rx_bufs) |
ab7db917 | 457 | skb = receive_mergeable(dev, rq, (unsigned long)buf, len); |
f121159d MT |
458 | else if (vi->big_packets) |
459 | skb = receive_big(dev, rq, buf, len); | |
460 | else | |
461 | skb = receive_small(buf, len); | |
462 | ||
463 | if (unlikely(!skb)) | |
464 | return; | |
3f2c31d9 | 465 | |
9ab86bbc | 466 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 467 | |
83a27052 | 468 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 469 | stats->rx_bytes += skb->len; |
470 | stats->rx_packets++; | |
83a27052 | 471 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 472 | |
b3f24698 | 473 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 474 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
475 | if (!skb_partial_csum_set(skb, |
476 | hdr->hdr.csum_start, | |
477 | hdr->hdr.csum_offset)) | |
296f96fc | 478 | goto frame_err; |
10a8d94a JW |
479 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
480 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
481 | } |
482 | ||
23cde76d MM |
483 | skb->protocol = eth_type_trans(skb, dev); |
484 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
485 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
486 | ||
b3f24698 | 487 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 488 | pr_debug("GSO!\n"); |
b3f24698 | 489 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc | 490 | case VIRTIO_NET_HDR_GSO_TCPV4: |
c9af6db4 | 491 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
296f96fc | 492 | break; |
296f96fc | 493 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 494 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
296f96fc RR |
495 | break; |
496 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 497 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
296f96fc RR |
498 | break; |
499 | default: | |
be443899 AW |
500 | net_warn_ratelimited("%s: bad gso type %u.\n", |
501 | dev->name, hdr->hdr.gso_type); | |
296f96fc RR |
502 | goto frame_err; |
503 | } | |
504 | ||
b3f24698 | 505 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
c9af6db4 | 506 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
34a48579 | 507 | |
b3f24698 | 508 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc | 509 | if (skb_shinfo(skb)->gso_size == 0) { |
be443899 | 510 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
296f96fc RR |
511 | goto frame_err; |
512 | } | |
513 | ||
514 | /* Header must be checked, and gso_segs computed. */ | |
515 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
516 | skb_shinfo(skb)->gso_segs = 0; | |
517 | } | |
518 | ||
91815639 JW |
519 | skb_mark_napi_id(skb, &rq->napi); |
520 | ||
296f96fc RR |
521 | netif_receive_skb(skb); |
522 | return; | |
523 | ||
524 | frame_err: | |
525 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
526 | dev_kfree_skb(skb); |
527 | } | |
528 | ||
e9d7417b | 529 | static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp) |
296f96fc | 530 | { |
e9d7417b | 531 | struct virtnet_info *vi = rq->vq->vdev->priv; |
296f96fc | 532 | struct sk_buff *skb; |
9ab86bbc | 533 | struct skb_vnet_hdr *hdr; |
9ab86bbc | 534 | int err; |
3f2c31d9 | 535 | |
5061de36 | 536 | skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp); |
9ab86bbc SM |
537 | if (unlikely(!skb)) |
538 | return -ENOMEM; | |
296f96fc | 539 | |
5061de36 | 540 | skb_put(skb, GOOD_PACKET_LEN); |
3f2c31d9 | 541 | |
9ab86bbc | 542 | hdr = skb_vnet_hdr(skb); |
a5835440 | 543 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
e9d7417b | 544 | sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr); |
e9d7417b | 545 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
97402b96 | 546 | |
9dc7b9e4 | 547 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp); |
9ab86bbc SM |
548 | if (err < 0) |
549 | dev_kfree_skb(skb); | |
97402b96 | 550 | |
9ab86bbc SM |
551 | return err; |
552 | } | |
97402b96 | 553 | |
e9d7417b | 554 | static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 555 | { |
9ab86bbc SM |
556 | struct page *first, *list = NULL; |
557 | char *p; | |
558 | int i, err, offset; | |
559 | ||
a5835440 RR |
560 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
561 | ||
e9d7417b | 562 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 563 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 564 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
565 | if (!first) { |
566 | if (list) | |
e9d7417b | 567 | give_pages(rq, list); |
9ab86bbc | 568 | return -ENOMEM; |
97402b96 | 569 | } |
e9d7417b | 570 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 571 | |
9ab86bbc SM |
572 | /* chain new page in list head to match sg */ |
573 | first->private = (unsigned long)list; | |
574 | list = first; | |
575 | } | |
296f96fc | 576 | |
e9d7417b | 577 | first = get_a_page(rq, gfp); |
9ab86bbc | 578 | if (!first) { |
e9d7417b | 579 | give_pages(rq, list); |
9ab86bbc SM |
580 | return -ENOMEM; |
581 | } | |
582 | p = page_address(first); | |
583 | ||
e9d7417b JW |
584 | /* rq->sg[0], rq->sg[1] share the same page */ |
585 | /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */ | |
586 | sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr)); | |
9ab86bbc | 587 | |
e9d7417b | 588 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 589 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 590 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
591 | |
592 | /* chain first in list head */ | |
593 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
594 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
595 | first, gfp); | |
9ab86bbc | 596 | if (err < 0) |
e9d7417b | 597 | give_pages(rq, first); |
9ab86bbc SM |
598 | |
599 | return err; | |
296f96fc RR |
600 | } |
601 | ||
fbf28d78 | 602 | static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len) |
3f2c31d9 | 603 | { |
ab7db917 | 604 | const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
fbf28d78 MD |
605 | unsigned int len; |
606 | ||
607 | len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len), | |
608 | GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); | |
609 | return ALIGN(len, MERGEABLE_BUFFER_ALIGN); | |
610 | } | |
611 | ||
612 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) | |
613 | { | |
fb51879d MD |
614 | struct page_frag *alloc_frag = &rq->alloc_frag; |
615 | char *buf; | |
ab7db917 | 616 | unsigned long ctx; |
3f2c31d9 | 617 | int err; |
fb51879d | 618 | unsigned int len, hole; |
3f2c31d9 | 619 | |
fbf28d78 | 620 | len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); |
ab7db917 | 621 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) |
9ab86bbc | 622 | return -ENOMEM; |
ab7db917 | 623 | |
fb51879d | 624 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
ab7db917 | 625 | ctx = mergeable_buf_to_ctx(buf, len); |
fb51879d | 626 | get_page(alloc_frag->page); |
fb51879d MD |
627 | alloc_frag->offset += len; |
628 | hole = alloc_frag->size - alloc_frag->offset; | |
ab7db917 MD |
629 | if (hole < len) { |
630 | /* To avoid internal fragmentation, if there is very likely not | |
631 | * enough space for another buffer, add the remaining space to | |
632 | * the current buffer. This extra space is not included in | |
633 | * the truesize stored in ctx. | |
634 | */ | |
fb51879d MD |
635 | len += hole; |
636 | alloc_frag->offset += hole; | |
637 | } | |
3f2c31d9 | 638 | |
fb51879d | 639 | sg_init_one(rq->sg, buf, len); |
ab7db917 | 640 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); |
9ab86bbc | 641 | if (err < 0) |
2613af0e | 642 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 643 | |
9ab86bbc SM |
644 | return err; |
645 | } | |
3f2c31d9 | 646 | |
b2baed69 RR |
647 | /* |
648 | * Returns false if we couldn't fill entirely (OOM). | |
649 | * | |
650 | * Normally run in the receive path, but can also be run from ndo_open | |
651 | * before we're receiving packets, or from refill_work which is | |
652 | * careful to disable receiving (using napi_disable). | |
653 | */ | |
e9d7417b | 654 | static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 655 | { |
e9d7417b | 656 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc | 657 | int err; |
1788f495 | 658 | bool oom; |
3f2c31d9 | 659 | |
fb51879d | 660 | gfp |= __GFP_COLD; |
9ab86bbc SM |
661 | do { |
662 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 663 | err = add_recvbuf_mergeable(rq, gfp); |
9ab86bbc | 664 | else if (vi->big_packets) |
e9d7417b | 665 | err = add_recvbuf_big(rq, gfp); |
9ab86bbc | 666 | else |
e9d7417b | 667 | err = add_recvbuf_small(rq, gfp); |
3f2c31d9 | 668 | |
1788f495 | 669 | oom = err == -ENOMEM; |
9ed4cb07 | 670 | if (err) |
3f2c31d9 | 671 | break; |
b7dfde95 | 672 | } while (rq->vq->num_free); |
681daee2 | 673 | virtqueue_kick(rq->vq); |
3161e453 | 674 | return !oom; |
3f2c31d9 MM |
675 | } |
676 | ||
18445c4d | 677 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
678 | { |
679 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 680 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 681 | |
18445c4d | 682 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 683 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 684 | virtqueue_disable_cb(rvq); |
e9d7417b | 685 | __napi_schedule(&rq->napi); |
18445c4d | 686 | } |
296f96fc RR |
687 | } |
688 | ||
e9d7417b | 689 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 690 | { |
e9d7417b | 691 | napi_enable(&rq->napi); |
3e9d08ec BR |
692 | |
693 | /* If all buffers were filled by other side before we napi_enabled, we | |
694 | * won't get another interrupt, so process any outstanding packets | |
695 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
696 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
697 | if (napi_schedule_prep(&rq->napi)) { |
698 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 699 | local_bh_disable(); |
e9d7417b | 700 | __napi_schedule(&rq->napi); |
ec13ee80 | 701 | local_bh_enable(); |
3e9d08ec BR |
702 | } |
703 | } | |
704 | ||
3161e453 RR |
705 | static void refill_work(struct work_struct *work) |
706 | { | |
e9d7417b JW |
707 | struct virtnet_info *vi = |
708 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 709 | bool still_empty; |
986a4f4d JW |
710 | int i; |
711 | ||
55257d72 | 712 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 713 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 714 | |
986a4f4d JW |
715 | napi_disable(&rq->napi); |
716 | still_empty = !try_fill_recv(rq, GFP_KERNEL); | |
717 | virtnet_napi_enable(rq); | |
3161e453 | 718 | |
986a4f4d JW |
719 | /* In theory, this can happen: if we don't get any buffers in |
720 | * we will *never* try to fill again. | |
721 | */ | |
722 | if (still_empty) | |
723 | schedule_delayed_work(&vi->refill, HZ/2); | |
724 | } | |
3161e453 RR |
725 | } |
726 | ||
2ffa7598 | 727 | static int virtnet_receive(struct receive_queue *rq, int budget) |
296f96fc | 728 | { |
e9d7417b | 729 | struct virtnet_info *vi = rq->vq->vdev->priv; |
2ffa7598 | 730 | unsigned int len, received = 0; |
9ab86bbc | 731 | void *buf; |
296f96fc | 732 | |
296f96fc | 733 | while (received < budget && |
e9d7417b JW |
734 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
735 | receive_buf(rq, buf, len); | |
296f96fc RR |
736 | received++; |
737 | } | |
738 | ||
be121f46 | 739 | if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { |
e9d7417b | 740 | if (!try_fill_recv(rq, GFP_ATOMIC)) |
3b07e9ca | 741 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 742 | } |
296f96fc | 743 | |
2ffa7598 JW |
744 | return received; |
745 | } | |
746 | ||
747 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
748 | { | |
749 | struct receive_queue *rq = | |
750 | container_of(napi, struct receive_queue, napi); | |
751 | unsigned int r, received = 0; | |
752 | ||
753 | again: | |
754 | received += virtnet_receive(rq, budget - received); | |
755 | ||
8329d98e RR |
756 | /* Out of packets? */ |
757 | if (received < budget) { | |
cbdadbbf | 758 | r = virtqueue_enable_cb_prepare(rq->vq); |
288379f0 | 759 | napi_complete(napi); |
cbdadbbf | 760 | if (unlikely(virtqueue_poll(rq->vq, r)) && |
8e95a202 | 761 | napi_schedule_prep(napi)) { |
e9d7417b | 762 | virtqueue_disable_cb(rq->vq); |
288379f0 | 763 | __napi_schedule(napi); |
296f96fc | 764 | goto again; |
4265f161 | 765 | } |
296f96fc RR |
766 | } |
767 | ||
768 | return received; | |
769 | } | |
770 | ||
91815639 JW |
771 | #ifdef CONFIG_NET_RX_BUSY_POLL |
772 | /* must be called with local_bh_disable()d */ | |
773 | static int virtnet_busy_poll(struct napi_struct *napi) | |
774 | { | |
775 | struct receive_queue *rq = | |
776 | container_of(napi, struct receive_queue, napi); | |
777 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
778 | int r, received = 0, budget = 4; | |
779 | ||
780 | if (!(vi->status & VIRTIO_NET_S_LINK_UP)) | |
781 | return LL_FLUSH_FAILED; | |
782 | ||
783 | if (!napi_schedule_prep(napi)) | |
784 | return LL_FLUSH_BUSY; | |
785 | ||
786 | virtqueue_disable_cb(rq->vq); | |
787 | ||
788 | again: | |
789 | received += virtnet_receive(rq, budget); | |
790 | ||
791 | r = virtqueue_enable_cb_prepare(rq->vq); | |
792 | clear_bit(NAPI_STATE_SCHED, &napi->state); | |
793 | if (unlikely(virtqueue_poll(rq->vq, r)) && | |
794 | napi_schedule_prep(napi)) { | |
795 | virtqueue_disable_cb(rq->vq); | |
796 | if (received < budget) { | |
797 | budget -= received; | |
798 | goto again; | |
799 | } else { | |
800 | __napi_schedule(napi); | |
801 | } | |
802 | } | |
803 | ||
804 | return received; | |
805 | } | |
806 | #endif /* CONFIG_NET_RX_BUSY_POLL */ | |
807 | ||
986a4f4d JW |
808 | static int virtnet_open(struct net_device *dev) |
809 | { | |
810 | struct virtnet_info *vi = netdev_priv(dev); | |
811 | int i; | |
812 | ||
e4166625 JW |
813 | for (i = 0; i < vi->max_queue_pairs; i++) { |
814 | if (i < vi->curr_queue_pairs) | |
815 | /* Make sure we have some buffers: if oom use wq. */ | |
816 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
817 | schedule_delayed_work(&vi->refill, 0); | |
986a4f4d JW |
818 | virtnet_napi_enable(&vi->rq[i]); |
819 | } | |
820 | ||
821 | return 0; | |
822 | } | |
823 | ||
b7dfde95 | 824 | static void free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
825 | { |
826 | struct sk_buff *skb; | |
6ee57bcc | 827 | unsigned int len; |
e9d7417b | 828 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 829 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 830 | |
e9d7417b | 831 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 832 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 833 | |
83a27052 | 834 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 835 | stats->tx_bytes += skb->len; |
836 | stats->tx_packets++; | |
83a27052 | 837 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 838 | |
ed79bab8 | 839 | dev_kfree_skb_any(skb); |
296f96fc RR |
840 | } |
841 | } | |
842 | ||
e9d7417b | 843 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 844 | { |
e7428e95 | 845 | struct skb_vnet_hdr *hdr; |
296f96fc | 846 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 847 | struct virtnet_info *vi = sq->vq->vdev->priv; |
7bedc7dc | 848 | unsigned num_sg; |
e7428e95 MT |
849 | unsigned hdr_len; |
850 | bool can_push; | |
296f96fc | 851 | |
e174961c | 852 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
853 | if (vi->mergeable_rx_bufs) |
854 | hdr_len = sizeof hdr->mhdr; | |
855 | else | |
856 | hdr_len = sizeof hdr->hdr; | |
857 | ||
858 | can_push = vi->any_header_sg && | |
859 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
860 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
861 | /* Even if we can, don't push here yet as this would skew | |
862 | * csum_start offset below. */ | |
863 | if (can_push) | |
864 | hdr = (struct skb_vnet_hdr *)(skb->data - hdr_len); | |
865 | else | |
866 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 867 | |
296f96fc | 868 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 869 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
55508d60 | 870 | hdr->hdr.csum_start = skb_checksum_start_offset(skb); |
b3f24698 | 871 | hdr->hdr.csum_offset = skb->csum_offset; |
296f96fc | 872 | } else { |
b3f24698 RR |
873 | hdr->hdr.flags = 0; |
874 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
875 | } |
876 | ||
877 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
878 | hdr->hdr.hdr_len = skb_headlen(skb); |
879 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 880 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 881 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 882 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 883 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 884 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 885 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
886 | else |
887 | BUG(); | |
34a48579 | 888 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 889 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 890 | } else { |
b3f24698 RR |
891 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
892 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
893 | } |
894 | ||
3f2c31d9 | 895 | if (vi->mergeable_rx_bufs) |
e7428e95 | 896 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 | 897 | |
a5835440 | 898 | sg_init_table(sq->sg, MAX_SKB_FRAGS + 2); |
e7428e95 MT |
899 | if (can_push) { |
900 | __skb_push(skb, hdr_len); | |
901 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
902 | /* Pull header back to avoid skew in tx bytes calculations. */ | |
903 | __skb_pull(skb, hdr_len); | |
904 | } else { | |
905 | sg_set_buf(sq->sg, hdr, hdr_len); | |
906 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; | |
907 | } | |
9dc7b9e4 | 908 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
909 | } |
910 | ||
424efe9c | 911 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
912 | { |
913 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
914 | int qnum = skb_get_queue_mapping(skb); |
915 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 916 | int err; |
4b7fd2e6 MT |
917 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
918 | bool kick = !skb->xmit_more; | |
2cb9c6ba | 919 | |
2cb9c6ba | 920 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 921 | free_old_xmit_skbs(sq); |
99ffc696 | 922 | |
03f191ba | 923 | /* Try to transmit */ |
b7dfde95 | 924 | err = xmit_skb(sq, skb); |
48925e37 | 925 | |
9ed4cb07 | 926 | /* This should not happen! */ |
681daee2 | 927 | if (unlikely(err)) { |
9ed4cb07 RR |
928 | dev->stats.tx_fifo_errors++; |
929 | if (net_ratelimit()) | |
930 | dev_warn(&dev->dev, | |
b7dfde95 | 931 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d | 932 | dev->stats.tx_dropped++; |
85e94525 | 933 | dev_kfree_skb_any(skb); |
58eba97d | 934 | return NETDEV_TX_OK; |
296f96fc | 935 | } |
03f191ba | 936 | |
48925e37 RR |
937 | /* Don't wait up for transmitted skbs to be freed. */ |
938 | skb_orphan(skb); | |
939 | nf_reset(skb); | |
940 | ||
941 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
942 | * before it gets out of hand. Naturally, this wastes entries. */ | |
b7dfde95 | 943 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 944 | netif_stop_subqueue(dev, qnum); |
e9d7417b | 945 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 946 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
947 | free_old_xmit_skbs(sq); |
948 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 949 | netif_start_subqueue(dev, qnum); |
e9d7417b | 950 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
951 | } |
952 | } | |
99ffc696 | 953 | } |
48925e37 | 954 | |
4b7fd2e6 | 955 | if (kick || netif_xmit_stopped(txq)) |
0b725a2c | 956 | virtqueue_kick(sq->vq); |
296f96fc | 957 | |
0b725a2c | 958 | return NETDEV_TX_OK; |
c223a078 DM |
959 | } |
960 | ||
40cbfc37 AK |
961 | /* |
962 | * Send command via the control virtqueue and check status. Commands | |
963 | * supported by the hypervisor, as indicated by feature bits, should | |
788a8b6d | 964 | * never fail unless improperly formatted. |
40cbfc37 AK |
965 | */ |
966 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
d24bae32 | 967 | struct scatterlist *out) |
40cbfc37 | 968 | { |
f7bc9594 | 969 | struct scatterlist *sgs[4], hdr, stat; |
40cbfc37 AK |
970 | struct virtio_net_ctrl_hdr ctrl; |
971 | virtio_net_ctrl_ack status = ~0; | |
d24bae32 | 972 | unsigned out_num = 0, tmp; |
40cbfc37 AK |
973 | |
974 | /* Caller should know better */ | |
f7bc9594 | 975 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 AK |
976 | |
977 | ctrl.class = class; | |
978 | ctrl.cmd = cmd; | |
f7bc9594 RR |
979 | /* Add header */ |
980 | sg_init_one(&hdr, &ctrl, sizeof(ctrl)); | |
981 | sgs[out_num++] = &hdr; | |
40cbfc37 | 982 | |
f7bc9594 RR |
983 | if (out) |
984 | sgs[out_num++] = out; | |
40cbfc37 | 985 | |
f7bc9594 RR |
986 | /* Add return status. */ |
987 | sg_init_one(&stat, &status, sizeof(status)); | |
d24bae32 | 988 | sgs[out_num] = &stat; |
40cbfc37 | 989 | |
d24bae32 | 990 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
a7c58146 | 991 | virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
40cbfc37 | 992 | |
67975901 HG |
993 | if (unlikely(!virtqueue_kick(vi->cvq))) |
994 | return status == VIRTIO_NET_OK; | |
40cbfc37 AK |
995 | |
996 | /* Spin for a response, the kick causes an ioport write, trapping | |
997 | * into the hypervisor, so the request should be handled immediately. | |
998 | */ | |
047b9b94 HG |
999 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
1000 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
1001 | cpu_relax(); |
1002 | ||
1003 | return status == VIRTIO_NET_OK; | |
1004 | } | |
1005 | ||
9c46f6d4 AW |
1006 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
1007 | { | |
1008 | struct virtnet_info *vi = netdev_priv(dev); | |
1009 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 1010 | int ret; |
7e58d5ae AK |
1011 | struct sockaddr *addr = p; |
1012 | struct scatterlist sg; | |
9c46f6d4 | 1013 | |
7e58d5ae | 1014 | ret = eth_prepare_mac_addr_change(dev, p); |
f2f2c8b4 JP |
1015 | if (ret) |
1016 | return ret; | |
9c46f6d4 | 1017 | |
7e58d5ae AK |
1018 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
1019 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
1020 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1021 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
7e58d5ae AK |
1022 | dev_warn(&vdev->dev, |
1023 | "Failed to set mac address by vq command.\n"); | |
1024 | return -EINVAL; | |
1025 | } | |
1026 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { | |
855e0c52 RR |
1027 | unsigned int i; |
1028 | ||
1029 | /* Naturally, this has an atomicity problem. */ | |
1030 | for (i = 0; i < dev->addr_len; i++) | |
1031 | virtio_cwrite8(vdev, | |
1032 | offsetof(struct virtio_net_config, mac) + | |
1033 | i, addr->sa_data[i]); | |
7e58d5ae AK |
1034 | } |
1035 | ||
1036 | eth_commit_mac_addr_change(dev, p); | |
9c46f6d4 AW |
1037 | |
1038 | return 0; | |
1039 | } | |
1040 | ||
3fa2a1df | 1041 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
1042 | struct rtnl_link_stats64 *tot) | |
1043 | { | |
1044 | struct virtnet_info *vi = netdev_priv(dev); | |
1045 | int cpu; | |
1046 | unsigned int start; | |
1047 | ||
1048 | for_each_possible_cpu(cpu) { | |
58472a76 | 1049 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 1050 | u64 tpackets, tbytes, rpackets, rbytes; |
1051 | ||
1052 | do { | |
57a7744e | 1053 | start = u64_stats_fetch_begin_irq(&stats->tx_syncp); |
3fa2a1df | 1054 | tpackets = stats->tx_packets; |
1055 | tbytes = stats->tx_bytes; | |
57a7744e | 1056 | } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); |
83a27052 ED |
1057 | |
1058 | do { | |
57a7744e | 1059 | start = u64_stats_fetch_begin_irq(&stats->rx_syncp); |
3fa2a1df | 1060 | rpackets = stats->rx_packets; |
1061 | rbytes = stats->rx_bytes; | |
57a7744e | 1062 | } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); |
3fa2a1df | 1063 | |
1064 | tot->rx_packets += rpackets; | |
1065 | tot->tx_packets += tpackets; | |
1066 | tot->rx_bytes += rbytes; | |
1067 | tot->tx_bytes += tbytes; | |
1068 | } | |
1069 | ||
1070 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 1071 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 1072 | tot->rx_dropped = dev->stats.rx_dropped; |
1073 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
1074 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
1075 | ||
1076 | return tot; | |
1077 | } | |
1078 | ||
da74e89d AS |
1079 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1080 | static void virtnet_netpoll(struct net_device *dev) | |
1081 | { | |
1082 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1083 | int i; |
da74e89d | 1084 | |
986a4f4d JW |
1085 | for (i = 0; i < vi->curr_queue_pairs; i++) |
1086 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
1087 | } |
1088 | #endif | |
1089 | ||
586d17c5 JW |
1090 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
1091 | { | |
1092 | rtnl_lock(); | |
1093 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
d24bae32 | 1094 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
586d17c5 JW |
1095 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
1096 | rtnl_unlock(); | |
1097 | } | |
1098 | ||
986a4f4d JW |
1099 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
1100 | { | |
1101 | struct scatterlist sg; | |
1102 | struct virtio_net_ctrl_mq s; | |
1103 | struct net_device *dev = vi->dev; | |
1104 | ||
1105 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
1106 | return 0; | |
1107 | ||
1108 | s.virtqueue_pairs = queue_pairs; | |
1109 | sg_init_one(&sg, &s, sizeof(s)); | |
1110 | ||
1111 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
d24bae32 | 1112 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
986a4f4d JW |
1113 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
1114 | queue_pairs); | |
1115 | return -EINVAL; | |
55257d72 | 1116 | } else { |
986a4f4d | 1117 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
1118 | /* virtnet_open() will refill when device is going to up. */ |
1119 | if (dev->flags & IFF_UP) | |
1120 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 1121 | } |
986a4f4d JW |
1122 | |
1123 | return 0; | |
1124 | } | |
1125 | ||
296f96fc RR |
1126 | static int virtnet_close(struct net_device *dev) |
1127 | { | |
1128 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1129 | int i; |
296f96fc | 1130 | |
b2baed69 RR |
1131 | /* Make sure refill_work doesn't re-enable napi! */ |
1132 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d JW |
1133 | |
1134 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1135 | napi_disable(&vi->rq[i].napi); | |
296f96fc | 1136 | |
296f96fc RR |
1137 | return 0; |
1138 | } | |
1139 | ||
2af7698e AW |
1140 | static void virtnet_set_rx_mode(struct net_device *dev) |
1141 | { | |
1142 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 1143 | struct scatterlist sg[2]; |
2af7698e | 1144 | u8 promisc, allmulti; |
f565a7c2 | 1145 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 1146 | struct netdev_hw_addr *ha; |
32e7bfc4 | 1147 | int uc_count; |
4cd24eaf | 1148 | int mc_count; |
f565a7c2 AW |
1149 | void *buf; |
1150 | int i; | |
2af7698e | 1151 | |
788a8b6d | 1152 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
2af7698e AW |
1153 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
1154 | return; | |
1155 | ||
f565a7c2 AW |
1156 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
1157 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1158 | |
23e258e1 | 1159 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
1160 | |
1161 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1162 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
2af7698e AW |
1163 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
1164 | promisc ? "en" : "dis"); | |
1165 | ||
23e258e1 | 1166 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
1167 | |
1168 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1169 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
2af7698e AW |
1170 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
1171 | allmulti ? "en" : "dis"); | |
f565a7c2 | 1172 | |
32e7bfc4 | 1173 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1174 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1175 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1176 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1177 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1178 | mac_data = buf; | |
e68ed8f0 | 1179 | if (!buf) |
f565a7c2 | 1180 | return; |
f565a7c2 | 1181 | |
23e258e1 AW |
1182 | sg_init_table(sg, 2); |
1183 | ||
f565a7c2 | 1184 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 1185 | mac_data->entries = uc_count; |
ccffad25 | 1186 | i = 0; |
32e7bfc4 | 1187 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1188 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1189 | |
1190 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1191 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1192 | |
1193 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1194 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1195 | |
4cd24eaf | 1196 | mac_data->entries = mc_count; |
567ec874 | 1197 | i = 0; |
22bedad3 JP |
1198 | netdev_for_each_mc_addr(ha, dev) |
1199 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1200 | |
1201 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1202 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1203 | |
1204 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1205 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
99e872ae | 1206 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
f565a7c2 AW |
1207 | |
1208 | kfree(buf); | |
2af7698e AW |
1209 | } |
1210 | ||
80d5c368 PM |
1211 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
1212 | __be16 proto, u16 vid) | |
0bde9569 AW |
1213 | { |
1214 | struct virtnet_info *vi = netdev_priv(dev); | |
1215 | struct scatterlist sg; | |
1216 | ||
23e258e1 | 1217 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1218 | |
1219 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1220 | VIRTIO_NET_CTRL_VLAN_ADD, &sg)) |
0bde9569 | 1221 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1222 | return 0; |
0bde9569 AW |
1223 | } |
1224 | ||
80d5c368 PM |
1225 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1226 | __be16 proto, u16 vid) | |
0bde9569 AW |
1227 | { |
1228 | struct virtnet_info *vi = netdev_priv(dev); | |
1229 | struct scatterlist sg; | |
1230 | ||
23e258e1 | 1231 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1232 | |
1233 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1234 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
0bde9569 | 1235 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1236 | return 0; |
0bde9569 AW |
1237 | } |
1238 | ||
8898c21c | 1239 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
986a4f4d JW |
1240 | { |
1241 | int i; | |
1242 | ||
8898c21c WG |
1243 | if (vi->affinity_hint_set) { |
1244 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
47be2479 WG |
1245 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
1246 | virtqueue_set_affinity(vi->sq[i].vq, -1); | |
1247 | } | |
1248 | ||
8898c21c WG |
1249 | vi->affinity_hint_set = false; |
1250 | } | |
8898c21c | 1251 | } |
47be2479 | 1252 | |
8898c21c WG |
1253 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1254 | { | |
1255 | int i; | |
1256 | int cpu; | |
986a4f4d JW |
1257 | |
1258 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1259 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1260 | * setting the affinity hint to eliminate the contention. | |
1261 | */ | |
8898c21c WG |
1262 | if (vi->curr_queue_pairs == 1 || |
1263 | vi->max_queue_pairs != num_online_cpus()) { | |
1264 | virtnet_clean_affinity(vi, -1); | |
1265 | return; | |
986a4f4d JW |
1266 | } |
1267 | ||
8898c21c WG |
1268 | i = 0; |
1269 | for_each_online_cpu(cpu) { | |
986a4f4d JW |
1270 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
1271 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
9bb8ca86 | 1272 | netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); |
8898c21c | 1273 | i++; |
986a4f4d JW |
1274 | } |
1275 | ||
8898c21c | 1276 | vi->affinity_hint_set = true; |
986a4f4d JW |
1277 | } |
1278 | ||
8de4b2f3 WG |
1279 | static int virtnet_cpu_callback(struct notifier_block *nfb, |
1280 | unsigned long action, void *hcpu) | |
1281 | { | |
1282 | struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); | |
1283 | ||
1284 | switch(action & ~CPU_TASKS_FROZEN) { | |
1285 | case CPU_ONLINE: | |
1286 | case CPU_DOWN_FAILED: | |
1287 | case CPU_DEAD: | |
1288 | virtnet_set_affinity(vi); | |
1289 | break; | |
1290 | case CPU_DOWN_PREPARE: | |
1291 | virtnet_clean_affinity(vi, (long)hcpu); | |
1292 | break; | |
1293 | default: | |
1294 | break; | |
1295 | } | |
3ab098df | 1296 | |
8de4b2f3 | 1297 | return NOTIFY_OK; |
986a4f4d JW |
1298 | } |
1299 | ||
8f9f4668 RJ |
1300 | static void virtnet_get_ringparam(struct net_device *dev, |
1301 | struct ethtool_ringparam *ring) | |
1302 | { | |
1303 | struct virtnet_info *vi = netdev_priv(dev); | |
1304 | ||
986a4f4d JW |
1305 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1306 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1307 | ring->rx_pending = ring->rx_max_pending; |
1308 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1309 | } |
1310 | ||
66846048 RJ |
1311 | |
1312 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1313 | struct ethtool_drvinfo *info) | |
1314 | { | |
1315 | struct virtnet_info *vi = netdev_priv(dev); | |
1316 | struct virtio_device *vdev = vi->vdev; | |
1317 | ||
1318 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1319 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1320 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1321 | ||
1322 | } | |
1323 | ||
d73bcd2c JW |
1324 | /* TODO: Eliminate OOO packets during switching */ |
1325 | static int virtnet_set_channels(struct net_device *dev, | |
1326 | struct ethtool_channels *channels) | |
1327 | { | |
1328 | struct virtnet_info *vi = netdev_priv(dev); | |
1329 | u16 queue_pairs = channels->combined_count; | |
1330 | int err; | |
1331 | ||
1332 | /* We don't support separate rx/tx channels. | |
1333 | * We don't allow setting 'other' channels. | |
1334 | */ | |
1335 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1336 | return -EINVAL; | |
1337 | ||
c18e9cd6 | 1338 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
d73bcd2c JW |
1339 | return -EINVAL; |
1340 | ||
47be2479 | 1341 | get_online_cpus(); |
d73bcd2c JW |
1342 | err = virtnet_set_queues(vi, queue_pairs); |
1343 | if (!err) { | |
1344 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1345 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1346 | ||
8898c21c | 1347 | virtnet_set_affinity(vi); |
d73bcd2c | 1348 | } |
47be2479 | 1349 | put_online_cpus(); |
d73bcd2c JW |
1350 | |
1351 | return err; | |
1352 | } | |
1353 | ||
1354 | static void virtnet_get_channels(struct net_device *dev, | |
1355 | struct ethtool_channels *channels) | |
1356 | { | |
1357 | struct virtnet_info *vi = netdev_priv(dev); | |
1358 | ||
1359 | channels->combined_count = vi->curr_queue_pairs; | |
1360 | channels->max_combined = vi->max_queue_pairs; | |
1361 | channels->max_other = 0; | |
1362 | channels->rx_count = 0; | |
1363 | channels->tx_count = 0; | |
1364 | channels->other_count = 0; | |
1365 | } | |
1366 | ||
0fc0b732 | 1367 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1368 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1369 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1370 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1371 | .set_channels = virtnet_set_channels, |
1372 | .get_channels = virtnet_get_channels, | |
a9ea3fc6 HX |
1373 | }; |
1374 | ||
39da5814 MM |
1375 | #define MIN_MTU 68 |
1376 | #define MAX_MTU 65535 | |
1377 | ||
1378 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
1379 | { | |
1380 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
1381 | return -EINVAL; | |
1382 | dev->mtu = new_mtu; | |
1383 | return 0; | |
1384 | } | |
1385 | ||
76288b4e SH |
1386 | static const struct net_device_ops virtnet_netdev = { |
1387 | .ndo_open = virtnet_open, | |
1388 | .ndo_stop = virtnet_close, | |
1389 | .ndo_start_xmit = start_xmit, | |
1390 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1391 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1392 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 1393 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 1394 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1395 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1396 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
1397 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1398 | .ndo_poll_controller = virtnet_netpoll, | |
1399 | #endif | |
91815639 JW |
1400 | #ifdef CONFIG_NET_RX_BUSY_POLL |
1401 | .ndo_busy_poll = virtnet_busy_poll, | |
1402 | #endif | |
76288b4e SH |
1403 | }; |
1404 | ||
586d17c5 | 1405 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1406 | { |
586d17c5 JW |
1407 | struct virtnet_info *vi = |
1408 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1409 | u16 v; |
1410 | ||
855e0c52 RR |
1411 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
1412 | struct virtio_net_config, status, &v) < 0) | |
507613bf | 1413 | return; |
586d17c5 JW |
1414 | |
1415 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1416 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1417 | virtnet_ack_link_announce(vi); |
1418 | } | |
9f4d26d0 MM |
1419 | |
1420 | /* Ignore unknown (future) status bits */ | |
1421 | v &= VIRTIO_NET_S_LINK_UP; | |
1422 | ||
1423 | if (vi->status == v) | |
507613bf | 1424 | return; |
9f4d26d0 MM |
1425 | |
1426 | vi->status = v; | |
1427 | ||
1428 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1429 | netif_carrier_on(vi->dev); | |
986a4f4d | 1430 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
1431 | } else { |
1432 | netif_carrier_off(vi->dev); | |
986a4f4d | 1433 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 MM |
1434 | } |
1435 | } | |
1436 | ||
1437 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1438 | { | |
1439 | struct virtnet_info *vi = vdev->priv; | |
1440 | ||
3b07e9ca | 1441 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1442 | } |
1443 | ||
986a4f4d JW |
1444 | static void virtnet_free_queues(struct virtnet_info *vi) |
1445 | { | |
d4fb84ee AV |
1446 | int i; |
1447 | ||
1448 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1449 | netif_napi_del(&vi->rq[i].napi); | |
1450 | ||
986a4f4d JW |
1451 | kfree(vi->rq); |
1452 | kfree(vi->sq); | |
1453 | } | |
1454 | ||
1455 | static void free_receive_bufs(struct virtnet_info *vi) | |
1456 | { | |
1457 | int i; | |
1458 | ||
1459 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1460 | while (vi->rq[i].pages) | |
1461 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
1462 | } | |
1463 | } | |
1464 | ||
fb51879d MD |
1465 | static void free_receive_page_frags(struct virtnet_info *vi) |
1466 | { | |
1467 | int i; | |
1468 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1469 | if (vi->rq[i].alloc_frag.page) | |
1470 | put_page(vi->rq[i].alloc_frag.page); | |
1471 | } | |
1472 | ||
986a4f4d JW |
1473 | static void free_unused_bufs(struct virtnet_info *vi) |
1474 | { | |
1475 | void *buf; | |
1476 | int i; | |
1477 | ||
1478 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1479 | struct virtqueue *vq = vi->sq[i].vq; | |
1480 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) | |
1481 | dev_kfree_skb(buf); | |
1482 | } | |
1483 | ||
1484 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1485 | struct virtqueue *vq = vi->rq[i].vq; | |
1486 | ||
1487 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
ab7db917 MD |
1488 | if (vi->mergeable_rx_bufs) { |
1489 | unsigned long ctx = (unsigned long)buf; | |
1490 | void *base = mergeable_ctx_to_buf_address(ctx); | |
1491 | put_page(virt_to_head_page(base)); | |
1492 | } else if (vi->big_packets) { | |
fa9fac17 | 1493 | give_pages(&vi->rq[i], buf); |
ab7db917 | 1494 | } else { |
986a4f4d | 1495 | dev_kfree_skb(buf); |
ab7db917 | 1496 | } |
986a4f4d | 1497 | } |
986a4f4d JW |
1498 | } |
1499 | } | |
1500 | ||
e9d7417b JW |
1501 | static void virtnet_del_vqs(struct virtnet_info *vi) |
1502 | { | |
1503 | struct virtio_device *vdev = vi->vdev; | |
1504 | ||
8898c21c | 1505 | virtnet_clean_affinity(vi, -1); |
986a4f4d | 1506 | |
e9d7417b | 1507 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
1508 | |
1509 | virtnet_free_queues(vi); | |
e9d7417b JW |
1510 | } |
1511 | ||
986a4f4d | 1512 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 1513 | { |
986a4f4d JW |
1514 | vq_callback_t **callbacks; |
1515 | struct virtqueue **vqs; | |
1516 | int ret = -ENOMEM; | |
1517 | int i, total_vqs; | |
1518 | const char **names; | |
1519 | ||
1520 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
1521 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
1522 | * possible control vq. | |
1523 | */ | |
1524 | total_vqs = vi->max_queue_pairs * 2 + | |
1525 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
1526 | ||
1527 | /* Allocate space for find_vqs parameters */ | |
1528 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
1529 | if (!vqs) | |
1530 | goto err_vq; | |
1531 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
1532 | if (!callbacks) | |
1533 | goto err_callback; | |
1534 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
1535 | if (!names) | |
1536 | goto err_names; | |
1537 | ||
1538 | /* Parameters for control virtqueue, if any */ | |
1539 | if (vi->has_cvq) { | |
1540 | callbacks[total_vqs - 1] = NULL; | |
1541 | names[total_vqs - 1] = "control"; | |
1542 | } | |
3f9c10b0 | 1543 | |
986a4f4d JW |
1544 | /* Allocate/initialize parameters for send/receive virtqueues */ |
1545 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1546 | callbacks[rxq2vq(i)] = skb_recv_done; | |
1547 | callbacks[txq2vq(i)] = skb_xmit_done; | |
1548 | sprintf(vi->rq[i].name, "input.%d", i); | |
1549 | sprintf(vi->sq[i].name, "output.%d", i); | |
1550 | names[rxq2vq(i)] = vi->rq[i].name; | |
1551 | names[txq2vq(i)] = vi->sq[i].name; | |
1552 | } | |
3f9c10b0 | 1553 | |
986a4f4d JW |
1554 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
1555 | names); | |
1556 | if (ret) | |
1557 | goto err_find; | |
3f9c10b0 | 1558 | |
986a4f4d JW |
1559 | if (vi->has_cvq) { |
1560 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 1561 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 1562 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 1563 | } |
986a4f4d JW |
1564 | |
1565 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1566 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
1567 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
1568 | } | |
1569 | ||
1570 | kfree(names); | |
1571 | kfree(callbacks); | |
1572 | kfree(vqs); | |
1573 | ||
3f9c10b0 | 1574 | return 0; |
986a4f4d JW |
1575 | |
1576 | err_find: | |
1577 | kfree(names); | |
1578 | err_names: | |
1579 | kfree(callbacks); | |
1580 | err_callback: | |
1581 | kfree(vqs); | |
1582 | err_vq: | |
1583 | return ret; | |
1584 | } | |
1585 | ||
1586 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
1587 | { | |
1588 | int i; | |
1589 | ||
1590 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
1591 | if (!vi->sq) | |
1592 | goto err_sq; | |
1593 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 1594 | if (!vi->rq) |
986a4f4d JW |
1595 | goto err_rq; |
1596 | ||
1597 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
1598 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1599 | vi->rq[i].pages = NULL; | |
1600 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
1601 | napi_weight); | |
91815639 | 1602 | napi_hash_add(&vi->rq[i].napi); |
986a4f4d JW |
1603 | |
1604 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
ab7db917 | 1605 | ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT); |
986a4f4d JW |
1606 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); |
1607 | } | |
1608 | ||
1609 | return 0; | |
1610 | ||
1611 | err_rq: | |
1612 | kfree(vi->sq); | |
1613 | err_sq: | |
1614 | return -ENOMEM; | |
1615 | } | |
1616 | ||
1617 | static int init_vqs(struct virtnet_info *vi) | |
1618 | { | |
1619 | int ret; | |
1620 | ||
1621 | /* Allocate send & receive queues */ | |
1622 | ret = virtnet_alloc_queues(vi); | |
1623 | if (ret) | |
1624 | goto err; | |
1625 | ||
1626 | ret = virtnet_find_vqs(vi); | |
1627 | if (ret) | |
1628 | goto err_free; | |
1629 | ||
47be2479 | 1630 | get_online_cpus(); |
8898c21c | 1631 | virtnet_set_affinity(vi); |
47be2479 WG |
1632 | put_online_cpus(); |
1633 | ||
986a4f4d JW |
1634 | return 0; |
1635 | ||
1636 | err_free: | |
1637 | virtnet_free_queues(vi); | |
1638 | err: | |
1639 | return ret; | |
3f9c10b0 AS |
1640 | } |
1641 | ||
fbf28d78 MD |
1642 | #ifdef CONFIG_SYSFS |
1643 | static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, | |
1644 | struct rx_queue_attribute *attribute, char *buf) | |
1645 | { | |
1646 | struct virtnet_info *vi = netdev_priv(queue->dev); | |
1647 | unsigned int queue_index = get_netdev_rx_queue_index(queue); | |
1648 | struct ewma *avg; | |
1649 | ||
1650 | BUG_ON(queue_index >= vi->max_queue_pairs); | |
1651 | avg = &vi->rq[queue_index].mrg_avg_pkt_len; | |
1652 | return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); | |
1653 | } | |
1654 | ||
1655 | static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = | |
1656 | __ATTR_RO(mergeable_rx_buffer_size); | |
1657 | ||
1658 | static struct attribute *virtio_net_mrg_rx_attrs[] = { | |
1659 | &mergeable_rx_buffer_size_attribute.attr, | |
1660 | NULL | |
1661 | }; | |
1662 | ||
1663 | static const struct attribute_group virtio_net_mrg_rx_group = { | |
1664 | .name = "virtio_net", | |
1665 | .attrs = virtio_net_mrg_rx_attrs | |
1666 | }; | |
1667 | #endif | |
1668 | ||
296f96fc RR |
1669 | static int virtnet_probe(struct virtio_device *vdev) |
1670 | { | |
986a4f4d | 1671 | int i, err; |
296f96fc RR |
1672 | struct net_device *dev; |
1673 | struct virtnet_info *vi; | |
986a4f4d JW |
1674 | u16 max_queue_pairs; |
1675 | ||
1676 | /* Find if host supports multiqueue virtio_net device */ | |
855e0c52 RR |
1677 | err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, |
1678 | struct virtio_net_config, | |
1679 | max_virtqueue_pairs, &max_queue_pairs); | |
986a4f4d JW |
1680 | |
1681 | /* We need at least 2 queue's */ | |
1682 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
1683 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
1684 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
1685 | max_queue_pairs = 1; | |
296f96fc RR |
1686 | |
1687 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 1688 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
1689 | if (!dev) |
1690 | return -ENOMEM; | |
1691 | ||
1692 | /* Set up network device as normal. */ | |
f2f2c8b4 | 1693 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 1694 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1695 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1696 | |
7ad24ea4 | 1697 | dev->ethtool_ops = &virtnet_ethtool_ops; |
296f96fc RR |
1698 | SET_NETDEV_DEV(dev, &vdev->dev); |
1699 | ||
1700 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1701 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1702 | /* This opens up the world of extra features. */ |
98e778c9 MM |
1703 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
1704 | if (csum) | |
1705 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1706 | ||
1707 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
1708 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO | |
34a48579 RR |
1709 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1710 | } | |
5539ae96 | 1711 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1712 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1713 | dev->hw_features |= NETIF_F_TSO; | |
1714 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1715 | dev->hw_features |= NETIF_F_TSO6; | |
1716 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1717 | dev->hw_features |= NETIF_F_TSO_ECN; | |
1718 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) | |
1719 | dev->hw_features |= NETIF_F_UFO; | |
1720 | ||
1721 | if (gso) | |
1722 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); | |
1723 | /* (!csum && gso) case will be fixed by register_netdev() */ | |
296f96fc | 1724 | } |
4f49129b TH |
1725 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
1726 | dev->features |= NETIF_F_RXCSUM; | |
296f96fc | 1727 | |
4fda8302 JW |
1728 | dev->vlan_features = dev->features; |
1729 | ||
296f96fc | 1730 | /* Configuration may specify what MAC to use. Otherwise random. */ |
855e0c52 RR |
1731 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
1732 | virtio_cread_bytes(vdev, | |
1733 | offsetof(struct virtio_net_config, mac), | |
1734 | dev->dev_addr, dev->addr_len); | |
1735 | else | |
f2cedb63 | 1736 | eth_hw_addr_random(dev); |
296f96fc RR |
1737 | |
1738 | /* Set up our device-specific information */ | |
1739 | vi = netdev_priv(dev); | |
296f96fc RR |
1740 | vi->dev = dev; |
1741 | vi->vdev = vdev; | |
d9d5dcc8 | 1742 | vdev->priv = vi; |
3fa2a1df | 1743 | vi->stats = alloc_percpu(struct virtnet_stats); |
1744 | err = -ENOMEM; | |
1745 | if (vi->stats == NULL) | |
1746 | goto free; | |
1747 | ||
827da44c JS |
1748 | for_each_possible_cpu(i) { |
1749 | struct virtnet_stats *virtnet_stats; | |
1750 | virtnet_stats = per_cpu_ptr(vi->stats, i); | |
1751 | u64_stats_init(&virtnet_stats->tx_syncp); | |
1752 | u64_stats_init(&virtnet_stats->rx_syncp); | |
1753 | } | |
1754 | ||
586d17c5 | 1755 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); |
296f96fc | 1756 | |
97402b96 | 1757 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1758 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1759 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
0e7ede80 JW |
1760 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
1761 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) | |
97402b96 HX |
1762 | vi->big_packets = true; |
1763 | ||
3f2c31d9 MM |
1764 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1765 | vi->mergeable_rx_bufs = true; | |
1766 | ||
e7428e95 MT |
1767 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) |
1768 | vi->any_header_sg = true; | |
1769 | ||
986a4f4d JW |
1770 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
1771 | vi->has_cvq = true; | |
1772 | ||
6ebbc1a6 ZH |
1773 | if (vi->any_header_sg) { |
1774 | if (vi->mergeable_rx_bufs) | |
1775 | dev->needed_headroom = sizeof(struct virtio_net_hdr_mrg_rxbuf); | |
1776 | else | |
1777 | dev->needed_headroom = sizeof(struct virtio_net_hdr); | |
1778 | } | |
1779 | ||
986a4f4d JW |
1780 | /* Use single tx/rx queue pair as default */ |
1781 | vi->curr_queue_pairs = 1; | |
1782 | vi->max_queue_pairs = max_queue_pairs; | |
1783 | ||
1784 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 1785 | err = init_vqs(vi); |
d2a7ddda | 1786 | if (err) |
9bb8ca86 | 1787 | goto free_stats; |
296f96fc | 1788 | |
fbf28d78 MD |
1789 | #ifdef CONFIG_SYSFS |
1790 | if (vi->mergeable_rx_bufs) | |
1791 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; | |
1792 | #endif | |
0f13b66b ZYW |
1793 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
1794 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); | |
986a4f4d | 1795 | |
296f96fc RR |
1796 | err = register_netdev(dev); |
1797 | if (err) { | |
1798 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1799 | goto free_vqs; |
296f96fc | 1800 | } |
b3369c1f | 1801 | |
4baf1e33 MT |
1802 | virtio_device_ready(vdev); |
1803 | ||
b3369c1f | 1804 | /* Last of all, set up some receive buffers. */ |
55257d72 | 1805 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d JW |
1806 | try_fill_recv(&vi->rq[i], GFP_KERNEL); |
1807 | ||
1808 | /* If we didn't even get one input buffer, we're useless. */ | |
be121f46 JW |
1809 | if (vi->rq[i].vq->num_free == |
1810 | virtqueue_get_vring_size(vi->rq[i].vq)) { | |
986a4f4d JW |
1811 | free_unused_bufs(vi); |
1812 | err = -ENOMEM; | |
1813 | goto free_recv_bufs; | |
1814 | } | |
b3369c1f RR |
1815 | } |
1816 | ||
8de4b2f3 WG |
1817 | vi->nb.notifier_call = &virtnet_cpu_callback; |
1818 | err = register_hotcpu_notifier(&vi->nb); | |
1819 | if (err) { | |
1820 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
1821 | goto free_recv_bufs; | |
1822 | } | |
1823 | ||
167c25e4 JW |
1824 | /* Assume link up if device can't report link status, |
1825 | otherwise get link status from config. */ | |
1826 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1827 | netif_carrier_off(dev); | |
3b07e9ca | 1828 | schedule_work(&vi->config_work); |
167c25e4 JW |
1829 | } else { |
1830 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1831 | netif_carrier_on(dev); | |
1832 | } | |
9f4d26d0 | 1833 | |
986a4f4d JW |
1834 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
1835 | dev->name, max_queue_pairs); | |
1836 | ||
296f96fc RR |
1837 | return 0; |
1838 | ||
986a4f4d | 1839 | free_recv_bufs: |
02465555 MT |
1840 | vi->vdev->config->reset(vdev); |
1841 | ||
986a4f4d | 1842 | free_receive_bufs(vi); |
b3369c1f | 1843 | unregister_netdev(dev); |
d2a7ddda | 1844 | free_vqs: |
986a4f4d | 1845 | cancel_delayed_work_sync(&vi->refill); |
fb51879d | 1846 | free_receive_page_frags(vi); |
e9d7417b | 1847 | virtnet_del_vqs(vi); |
3fa2a1df | 1848 | free_stats: |
1849 | free_percpu(vi->stats); | |
296f96fc RR |
1850 | free: |
1851 | free_netdev(dev); | |
1852 | return err; | |
1853 | } | |
1854 | ||
04486ed0 | 1855 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1856 | { |
04486ed0 | 1857 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1858 | |
1859 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1860 | free_unused_bufs(vi); |
fb6813f4 | 1861 | |
986a4f4d | 1862 | free_receive_bufs(vi); |
d2a7ddda | 1863 | |
fb51879d MD |
1864 | free_receive_page_frags(vi); |
1865 | ||
986a4f4d | 1866 | virtnet_del_vqs(vi); |
04486ed0 AS |
1867 | } |
1868 | ||
8cc085d6 | 1869 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
1870 | { |
1871 | struct virtnet_info *vi = vdev->priv; | |
1872 | ||
8de4b2f3 WG |
1873 | unregister_hotcpu_notifier(&vi->nb); |
1874 | ||
102a2786 MT |
1875 | /* Make sure no work handler is accessing the device. */ |
1876 | flush_work(&vi->config_work); | |
586d17c5 | 1877 | |
04486ed0 AS |
1878 | unregister_netdev(vi->dev); |
1879 | ||
1880 | remove_vq_common(vi); | |
fb6813f4 | 1881 | |
2e66f55b | 1882 | free_percpu(vi->stats); |
74b2553f | 1883 | free_netdev(vi->dev); |
296f96fc RR |
1884 | } |
1885 | ||
89107000 | 1886 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
1887 | static int virtnet_freeze(struct virtio_device *vdev) |
1888 | { | |
1889 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1890 | int i; |
0741bcb5 | 1891 | |
ec9debbd JW |
1892 | unregister_hotcpu_notifier(&vi->nb); |
1893 | ||
102a2786 MT |
1894 | /* Make sure no work handler is accessing the device */ |
1895 | flush_work(&vi->config_work); | |
586d17c5 | 1896 | |
0741bcb5 AS |
1897 | netif_device_detach(vi->dev); |
1898 | cancel_delayed_work_sync(&vi->refill); | |
1899 | ||
91815639 | 1900 | if (netif_running(vi->dev)) { |
986a4f4d JW |
1901 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1902 | napi_disable(&vi->rq[i].napi); | |
91815639 | 1903 | napi_hash_del(&vi->rq[i].napi); |
986a4f4d JW |
1904 | netif_napi_del(&vi->rq[i].napi); |
1905 | } | |
91815639 | 1906 | } |
0741bcb5 AS |
1907 | |
1908 | remove_vq_common(vi); | |
1909 | ||
1910 | return 0; | |
1911 | } | |
1912 | ||
1913 | static int virtnet_restore(struct virtio_device *vdev) | |
1914 | { | |
1915 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1916 | int err, i; |
0741bcb5 AS |
1917 | |
1918 | err = init_vqs(vi); | |
1919 | if (err) | |
1920 | return err; | |
1921 | ||
e53fbd11 MT |
1922 | virtio_device_ready(vdev); |
1923 | ||
6cd4ce00 JW |
1924 | if (netif_running(vi->dev)) { |
1925 | for (i = 0; i < vi->curr_queue_pairs; i++) | |
1926 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
1927 | schedule_delayed_work(&vi->refill, 0); | |
1928 | ||
986a4f4d JW |
1929 | for (i = 0; i < vi->max_queue_pairs; i++) |
1930 | virtnet_napi_enable(&vi->rq[i]); | |
6cd4ce00 | 1931 | } |
0741bcb5 AS |
1932 | |
1933 | netif_device_attach(vi->dev); | |
1934 | ||
35ed159b | 1935 | rtnl_lock(); |
986a4f4d | 1936 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
35ed159b | 1937 | rtnl_unlock(); |
986a4f4d | 1938 | |
ec9debbd JW |
1939 | err = register_hotcpu_notifier(&vi->nb); |
1940 | if (err) | |
1941 | return err; | |
1942 | ||
0741bcb5 AS |
1943 | return 0; |
1944 | } | |
1945 | #endif | |
1946 | ||
296f96fc RR |
1947 | static struct virtio_device_id id_table[] = { |
1948 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1949 | { 0 }, | |
1950 | }; | |
1951 | ||
c45a6816 | 1952 | static unsigned int features[] = { |
5e4fe5c4 MM |
1953 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1954 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1955 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1956 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1957 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1958 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1959 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
986a4f4d | 1960 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, |
7e58d5ae | 1961 | VIRTIO_NET_F_CTRL_MAC_ADDR, |
e7428e95 | 1962 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
1963 | }; |
1964 | ||
22402529 | 1965 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1966 | .feature_table = features, |
1967 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1968 | .driver.name = KBUILD_MODNAME, |
1969 | .driver.owner = THIS_MODULE, | |
1970 | .id_table = id_table, | |
1971 | .probe = virtnet_probe, | |
8cc085d6 | 1972 | .remove = virtnet_remove, |
9f4d26d0 | 1973 | .config_changed = virtnet_config_changed, |
89107000 | 1974 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
1975 | .freeze = virtnet_freeze, |
1976 | .restore = virtnet_restore, | |
1977 | #endif | |
296f96fc RR |
1978 | }; |
1979 | ||
b2a17029 | 1980 | module_virtio_driver(virtio_net_driver); |
296f96fc RR |
1981 | |
1982 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1983 | MODULE_DESCRIPTION("Virtio network driver"); | |
1984 | MODULE_LICENSE("GPL"); |