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 | |
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 | |
5377d758 JB |
43 | /* RX packet size EWMA. The average packet size is used to determine the packet |
44 | * buffer size when refilling RX rings. As the entire RX ring may be refilled | |
45 | * at once, the weight is chosen so that the EWMA will be insensitive to short- | |
46 | * term, transient changes in packet size. | |
ab7db917 | 47 | */ |
5377d758 | 48 | DECLARE_EWMA(pkt_len, 1, 64) |
ab7db917 MD |
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.$index */ | |
74 | char name[40]; | |
e9d7417b JW |
75 | }; |
76 | ||
77 | /* Internal representation of a receive virtqueue */ | |
78 | struct receive_queue { | |
79 | /* Virtqueue associated with this receive_queue */ | |
80 | struct virtqueue *vq; | |
81 | ||
296f96fc RR |
82 | struct napi_struct napi; |
83 | ||
e9d7417b JW |
84 | /* Chain pages by the private ptr. */ |
85 | struct page *pages; | |
86 | ||
ab7db917 | 87 | /* Average packet length for mergeable receive buffers. */ |
5377d758 | 88 | struct ewma_pkt_len mrg_avg_pkt_len; |
ab7db917 | 89 | |
fb51879d MD |
90 | /* Page frag for packet buffer allocation. */ |
91 | struct page_frag alloc_frag; | |
92 | ||
e9d7417b JW |
93 | /* RX: fragments + linear part + virtio header */ |
94 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
95 | |
96 | /* Name of this receive queue: input.$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 | ||
012873d0 MT |
126 | /* Packet virtio header size */ |
127 | u8 hdr_len; | |
128 | ||
3fa2a1df | 129 | /* Active statistics */ |
130 | struct virtnet_stats __percpu *stats; | |
131 | ||
3161e453 RR |
132 | /* Work struct for refilling if we run low on memory. */ |
133 | struct delayed_work refill; | |
134 | ||
586d17c5 JW |
135 | /* Work struct for config space updates */ |
136 | struct work_struct config_work; | |
137 | ||
986a4f4d JW |
138 | /* Does the affinity hint is set for virtqueues? */ |
139 | bool affinity_hint_set; | |
47be2479 | 140 | |
8de4b2f3 WG |
141 | /* CPU hot plug notifier */ |
142 | struct notifier_block nb; | |
2ac46030 MT |
143 | |
144 | /* Control VQ buffers: protected by the rtnl lock */ | |
145 | struct virtio_net_ctrl_hdr ctrl_hdr; | |
146 | virtio_net_ctrl_ack ctrl_status; | |
147 | u8 ctrl_promisc; | |
148 | u8 ctrl_allmulti; | |
296f96fc RR |
149 | }; |
150 | ||
9ab86bbc | 151 | struct padded_vnet_hdr { |
012873d0 | 152 | struct virtio_net_hdr_mrg_rxbuf hdr; |
9ab86bbc | 153 | /* |
012873d0 MT |
154 | * hdr is in a separate sg buffer, and data sg buffer shares same page |
155 | * with this header sg. This padding makes next sg 16 byte aligned | |
156 | * after the header. | |
9ab86bbc | 157 | */ |
012873d0 | 158 | char padding[4]; |
9ab86bbc SM |
159 | }; |
160 | ||
986a4f4d JW |
161 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
162 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
163 | */ | |
164 | static int vq2txq(struct virtqueue *vq) | |
165 | { | |
9d0ca6ed | 166 | return (vq->index - 1) / 2; |
986a4f4d JW |
167 | } |
168 | ||
169 | static int txq2vq(int txq) | |
170 | { | |
171 | return txq * 2 + 1; | |
172 | } | |
173 | ||
174 | static int vq2rxq(struct virtqueue *vq) | |
175 | { | |
9d0ca6ed | 176 | return vq->index / 2; |
986a4f4d JW |
177 | } |
178 | ||
179 | static int rxq2vq(int rxq) | |
180 | { | |
181 | return rxq * 2; | |
182 | } | |
183 | ||
012873d0 | 184 | static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 185 | { |
012873d0 | 186 | return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; |
296f96fc RR |
187 | } |
188 | ||
9ab86bbc SM |
189 | /* |
190 | * private is used to chain pages for big packets, put the whole | |
191 | * most recent used list in the beginning for reuse | |
192 | */ | |
e9d7417b | 193 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 194 | { |
9ab86bbc | 195 | struct page *end; |
0a888fd1 | 196 | |
e9d7417b | 197 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 198 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
199 | end->private = (unsigned long)rq->pages; |
200 | rq->pages = page; | |
0a888fd1 MM |
201 | } |
202 | ||
e9d7417b | 203 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 204 | { |
e9d7417b | 205 | struct page *p = rq->pages; |
fb6813f4 | 206 | |
9ab86bbc | 207 | if (p) { |
e9d7417b | 208 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
209 | /* clear private here, it is used to chain pages */ |
210 | p->private = 0; | |
211 | } else | |
fb6813f4 RR |
212 | p = alloc_page(gfp_mask); |
213 | return p; | |
214 | } | |
215 | ||
e9d7417b | 216 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 217 | { |
e9d7417b | 218 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 219 | |
2cb9c6ba | 220 | /* Suppress further interrupts. */ |
e9d7417b | 221 | virtqueue_disable_cb(vq); |
11a3a154 | 222 | |
363f1514 | 223 | /* We were probably waiting for more output buffers. */ |
986a4f4d | 224 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
296f96fc RR |
225 | } |
226 | ||
ab7db917 MD |
227 | static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) |
228 | { | |
229 | unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); | |
230 | return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; | |
231 | } | |
232 | ||
233 | static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) | |
234 | { | |
235 | return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); | |
236 | ||
237 | } | |
238 | ||
239 | static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) | |
240 | { | |
241 | unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; | |
242 | return (unsigned long)buf | (size - 1); | |
243 | } | |
244 | ||
3464645a | 245 | /* Called from bottom half context */ |
946fa564 MT |
246 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
247 | struct receive_queue *rq, | |
2613af0e MD |
248 | struct page *page, unsigned int offset, |
249 | unsigned int len, unsigned int truesize) | |
9ab86bbc SM |
250 | { |
251 | struct sk_buff *skb; | |
012873d0 | 252 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
2613af0e | 253 | unsigned int copy, hdr_len, hdr_padded_len; |
9ab86bbc | 254 | char *p; |
fb6813f4 | 255 | |
2613af0e | 256 | p = page_address(page) + offset; |
3f2c31d9 | 257 | |
9ab86bbc SM |
258 | /* copy small packet so we can reuse these pages for small data */ |
259 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
260 | if (unlikely(!skb)) | |
261 | return NULL; | |
3f2c31d9 | 262 | |
9ab86bbc | 263 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 264 | |
012873d0 MT |
265 | hdr_len = vi->hdr_len; |
266 | if (vi->mergeable_rx_bufs) | |
267 | hdr_padded_len = sizeof *hdr; | |
268 | else | |
2613af0e | 269 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
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 | |
012873d0 | 320 | static struct sk_buff *receive_small(struct virtnet_info *vi, void *buf, unsigned int len) |
f121159d MT |
321 | { |
322 | struct sk_buff * skb = buf; | |
323 | ||
012873d0 | 324 | len -= vi->hdr_len; |
f121159d MT |
325 | skb_trim(skb, len); |
326 | ||
327 | return skb; | |
328 | } | |
329 | ||
330 | static struct sk_buff *receive_big(struct net_device *dev, | |
946fa564 | 331 | struct virtnet_info *vi, |
f121159d MT |
332 | struct receive_queue *rq, |
333 | void *buf, | |
334 | unsigned int len) | |
335 | { | |
336 | struct page *page = buf; | |
946fa564 | 337 | struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE); |
f121159d MT |
338 | |
339 | if (unlikely(!skb)) | |
340 | goto err; | |
341 | ||
342 | return skb; | |
343 | ||
344 | err: | |
345 | dev->stats.rx_dropped++; | |
346 | give_pages(rq, page); | |
347 | return NULL; | |
348 | } | |
349 | ||
8fc3b9e9 | 350 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
fdd819b2 | 351 | struct virtnet_info *vi, |
8fc3b9e9 | 352 | struct receive_queue *rq, |
ab7db917 | 353 | unsigned long ctx, |
8fc3b9e9 | 354 | unsigned int len) |
9ab86bbc | 355 | { |
ab7db917 | 356 | void *buf = mergeable_ctx_to_buf_address(ctx); |
012873d0 MT |
357 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; |
358 | u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); | |
8fc3b9e9 MT |
359 | struct page *page = virt_to_head_page(buf); |
360 | int offset = buf - page_address(page); | |
ab7db917 MD |
361 | unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
362 | ||
946fa564 MT |
363 | struct sk_buff *head_skb = page_to_skb(vi, rq, page, offset, len, |
364 | truesize); | |
2613af0e | 365 | struct sk_buff *curr_skb = head_skb; |
9ab86bbc | 366 | |
8fc3b9e9 MT |
367 | if (unlikely(!curr_skb)) |
368 | goto err_skb; | |
9ab86bbc | 369 | while (--num_buf) { |
8fc3b9e9 MT |
370 | int num_skb_frags; |
371 | ||
ab7db917 MD |
372 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
373 | if (unlikely(!ctx)) { | |
8fc3b9e9 | 374 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
fdd819b2 | 375 | dev->name, num_buf, |
012873d0 MT |
376 | virtio16_to_cpu(vi->vdev, |
377 | hdr->num_buffers)); | |
8fc3b9e9 MT |
378 | dev->stats.rx_length_errors++; |
379 | goto err_buf; | |
3f2c31d9 | 380 | } |
8fc3b9e9 | 381 | |
ab7db917 | 382 | buf = mergeable_ctx_to_buf_address(ctx); |
8fc3b9e9 | 383 | page = virt_to_head_page(buf); |
8fc3b9e9 MT |
384 | |
385 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; | |
2613af0e MD |
386 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
387 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
8fc3b9e9 MT |
388 | |
389 | if (unlikely(!nskb)) | |
390 | goto err_skb; | |
2613af0e MD |
391 | if (curr_skb == head_skb) |
392 | skb_shinfo(curr_skb)->frag_list = nskb; | |
393 | else | |
394 | curr_skb->next = nskb; | |
395 | curr_skb = nskb; | |
396 | head_skb->truesize += nskb->truesize; | |
397 | num_skb_frags = 0; | |
398 | } | |
ab7db917 | 399 | truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
2613af0e MD |
400 | if (curr_skb != head_skb) { |
401 | head_skb->data_len += len; | |
402 | head_skb->len += len; | |
fb51879d | 403 | head_skb->truesize += truesize; |
2613af0e | 404 | } |
8fc3b9e9 | 405 | offset = buf - page_address(page); |
ba275241 JW |
406 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
407 | put_page(page); | |
408 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
fb51879d | 409 | len, truesize); |
ba275241 JW |
410 | } else { |
411 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
fb51879d | 412 | offset, len, truesize); |
ba275241 | 413 | } |
8fc3b9e9 MT |
414 | } |
415 | ||
5377d758 | 416 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); |
8fc3b9e9 MT |
417 | return head_skb; |
418 | ||
419 | err_skb: | |
420 | put_page(page); | |
421 | while (--num_buf) { | |
ab7db917 MD |
422 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
423 | if (unlikely(!ctx)) { | |
8fc3b9e9 MT |
424 | pr_debug("%s: rx error: %d buffers missing\n", |
425 | dev->name, num_buf); | |
426 | dev->stats.rx_length_errors++; | |
427 | break; | |
428 | } | |
ab7db917 | 429 | page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); |
8fc3b9e9 | 430 | put_page(page); |
9ab86bbc | 431 | } |
8fc3b9e9 MT |
432 | err_buf: |
433 | dev->stats.rx_dropped++; | |
434 | dev_kfree_skb(head_skb); | |
435 | return NULL; | |
9ab86bbc SM |
436 | } |
437 | ||
946fa564 MT |
438 | static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
439 | void *buf, unsigned int len) | |
9ab86bbc | 440 | { |
e9d7417b | 441 | struct net_device *dev = vi->dev; |
58472a76 | 442 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc | 443 | struct sk_buff *skb; |
012873d0 | 444 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
3f2c31d9 | 445 | |
bcff3162 | 446 | if (unlikely(len < vi->hdr_len + ETH_HLEN)) { |
9ab86bbc SM |
447 | pr_debug("%s: short packet %i\n", dev->name, len); |
448 | dev->stats.rx_length_errors++; | |
ab7db917 MD |
449 | if (vi->mergeable_rx_bufs) { |
450 | unsigned long ctx = (unsigned long)buf; | |
451 | void *base = mergeable_ctx_to_buf_address(ctx); | |
452 | put_page(virt_to_head_page(base)); | |
453 | } else if (vi->big_packets) { | |
98bfd23c | 454 | give_pages(rq, buf); |
ab7db917 | 455 | } else { |
9ab86bbc | 456 | dev_kfree_skb(buf); |
ab7db917 | 457 | } |
9ab86bbc SM |
458 | return; |
459 | } | |
3f2c31d9 | 460 | |
f121159d | 461 | if (vi->mergeable_rx_bufs) |
fdd819b2 | 462 | skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len); |
f121159d | 463 | else if (vi->big_packets) |
946fa564 | 464 | skb = receive_big(dev, vi, rq, buf, len); |
f121159d | 465 | else |
012873d0 | 466 | skb = receive_small(vi, buf, len); |
f121159d MT |
467 | |
468 | if (unlikely(!skb)) | |
469 | return; | |
3f2c31d9 | 470 | |
9ab86bbc | 471 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 472 | |
83a27052 | 473 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 474 | stats->rx_bytes += skb->len; |
475 | stats->rx_packets++; | |
83a27052 | 476 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 477 | |
b3f24698 | 478 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 479 | pr_debug("Needs csum!\n"); |
b3f24698 | 480 | if (!skb_partial_csum_set(skb, |
fdd819b2 MT |
481 | virtio16_to_cpu(vi->vdev, hdr->hdr.csum_start), |
482 | virtio16_to_cpu(vi->vdev, hdr->hdr.csum_offset))) | |
296f96fc | 483 | goto frame_err; |
10a8d94a JW |
484 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
485 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
486 | } |
487 | ||
23cde76d MM |
488 | skb->protocol = eth_type_trans(skb, dev); |
489 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
490 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
491 | ||
b3f24698 | 492 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 493 | pr_debug("GSO!\n"); |
b3f24698 | 494 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc | 495 | case VIRTIO_NET_HDR_GSO_TCPV4: |
c9af6db4 | 496 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
296f96fc | 497 | break; |
296f96fc | 498 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 499 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
296f96fc RR |
500 | break; |
501 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 502 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
296f96fc RR |
503 | break; |
504 | default: | |
be443899 AW |
505 | net_warn_ratelimited("%s: bad gso type %u.\n", |
506 | dev->name, hdr->hdr.gso_type); | |
296f96fc RR |
507 | goto frame_err; |
508 | } | |
509 | ||
b3f24698 | 510 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
c9af6db4 | 511 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
34a48579 | 512 | |
fdd819b2 MT |
513 | skb_shinfo(skb)->gso_size = virtio16_to_cpu(vi->vdev, |
514 | hdr->hdr.gso_size); | |
296f96fc | 515 | if (skb_shinfo(skb)->gso_size == 0) { |
be443899 | 516 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
296f96fc RR |
517 | goto frame_err; |
518 | } | |
519 | ||
520 | /* Header must be checked, and gso_segs computed. */ | |
521 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
522 | skb_shinfo(skb)->gso_segs = 0; | |
523 | } | |
524 | ||
91815639 JW |
525 | skb_mark_napi_id(skb, &rq->napi); |
526 | ||
0fbd050a | 527 | napi_gro_receive(&rq->napi, skb); |
296f96fc RR |
528 | return; |
529 | ||
530 | frame_err: | |
531 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
532 | dev_kfree_skb(skb); |
533 | } | |
534 | ||
946fa564 MT |
535 | static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
536 | gfp_t gfp) | |
296f96fc RR |
537 | { |
538 | struct sk_buff *skb; | |
012873d0 | 539 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
9ab86bbc | 540 | int err; |
3f2c31d9 | 541 | |
5061de36 | 542 | skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp); |
9ab86bbc SM |
543 | if (unlikely(!skb)) |
544 | return -ENOMEM; | |
296f96fc | 545 | |
5061de36 | 546 | skb_put(skb, GOOD_PACKET_LEN); |
3f2c31d9 | 547 | |
9ab86bbc | 548 | hdr = skb_vnet_hdr(skb); |
547c890c | 549 | sg_init_table(rq->sg, 2); |
012873d0 | 550 | sg_set_buf(rq->sg, hdr, vi->hdr_len); |
e9d7417b | 551 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
97402b96 | 552 | |
9dc7b9e4 | 553 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp); |
9ab86bbc SM |
554 | if (err < 0) |
555 | dev_kfree_skb(skb); | |
97402b96 | 556 | |
9ab86bbc SM |
557 | return err; |
558 | } | |
97402b96 | 559 | |
012873d0 MT |
560 | static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, |
561 | gfp_t gfp) | |
9ab86bbc | 562 | { |
9ab86bbc SM |
563 | struct page *first, *list = NULL; |
564 | char *p; | |
565 | int i, err, offset; | |
566 | ||
a5835440 RR |
567 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
568 | ||
e9d7417b | 569 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 570 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 571 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
572 | if (!first) { |
573 | if (list) | |
e9d7417b | 574 | give_pages(rq, list); |
9ab86bbc | 575 | return -ENOMEM; |
97402b96 | 576 | } |
e9d7417b | 577 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 578 | |
9ab86bbc SM |
579 | /* chain new page in list head to match sg */ |
580 | first->private = (unsigned long)list; | |
581 | list = first; | |
582 | } | |
296f96fc | 583 | |
e9d7417b | 584 | first = get_a_page(rq, gfp); |
9ab86bbc | 585 | if (!first) { |
e9d7417b | 586 | give_pages(rq, list); |
9ab86bbc SM |
587 | return -ENOMEM; |
588 | } | |
589 | p = page_address(first); | |
590 | ||
e9d7417b | 591 | /* rq->sg[0], rq->sg[1] share the same page */ |
012873d0 MT |
592 | /* a separated rq->sg[0] for header - required in case !any_header_sg */ |
593 | sg_set_buf(&rq->sg[0], p, vi->hdr_len); | |
9ab86bbc | 594 | |
e9d7417b | 595 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 596 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 597 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
598 | |
599 | /* chain first in list head */ | |
600 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
601 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
602 | first, gfp); | |
9ab86bbc | 603 | if (err < 0) |
e9d7417b | 604 | give_pages(rq, first); |
9ab86bbc SM |
605 | |
606 | return err; | |
296f96fc RR |
607 | } |
608 | ||
5377d758 | 609 | static unsigned int get_mergeable_buf_len(struct ewma_pkt_len *avg_pkt_len) |
3f2c31d9 | 610 | { |
ab7db917 | 611 | const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
fbf28d78 MD |
612 | unsigned int len; |
613 | ||
5377d758 | 614 | len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), |
fbf28d78 MD |
615 | GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); |
616 | return ALIGN(len, MERGEABLE_BUFFER_ALIGN); | |
617 | } | |
618 | ||
619 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) | |
620 | { | |
fb51879d MD |
621 | struct page_frag *alloc_frag = &rq->alloc_frag; |
622 | char *buf; | |
ab7db917 | 623 | unsigned long ctx; |
3f2c31d9 | 624 | int err; |
fb51879d | 625 | unsigned int len, hole; |
3f2c31d9 | 626 | |
fbf28d78 | 627 | len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); |
ab7db917 | 628 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) |
9ab86bbc | 629 | return -ENOMEM; |
ab7db917 | 630 | |
fb51879d | 631 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
ab7db917 | 632 | ctx = mergeable_buf_to_ctx(buf, len); |
fb51879d | 633 | get_page(alloc_frag->page); |
fb51879d MD |
634 | alloc_frag->offset += len; |
635 | hole = alloc_frag->size - alloc_frag->offset; | |
ab7db917 MD |
636 | if (hole < len) { |
637 | /* To avoid internal fragmentation, if there is very likely not | |
638 | * enough space for another buffer, add the remaining space to | |
639 | * the current buffer. This extra space is not included in | |
640 | * the truesize stored in ctx. | |
641 | */ | |
fb51879d MD |
642 | len += hole; |
643 | alloc_frag->offset += hole; | |
644 | } | |
3f2c31d9 | 645 | |
fb51879d | 646 | sg_init_one(rq->sg, buf, len); |
ab7db917 | 647 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); |
9ab86bbc | 648 | if (err < 0) |
2613af0e | 649 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 650 | |
9ab86bbc SM |
651 | return err; |
652 | } | |
3f2c31d9 | 653 | |
b2baed69 RR |
654 | /* |
655 | * Returns false if we couldn't fill entirely (OOM). | |
656 | * | |
657 | * Normally run in the receive path, but can also be run from ndo_open | |
658 | * before we're receiving packets, or from refill_work which is | |
659 | * careful to disable receiving (using napi_disable). | |
660 | */ | |
946fa564 MT |
661 | static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, |
662 | gfp_t gfp) | |
9ab86bbc SM |
663 | { |
664 | int err; | |
1788f495 | 665 | bool oom; |
3f2c31d9 | 666 | |
fb51879d | 667 | gfp |= __GFP_COLD; |
9ab86bbc SM |
668 | do { |
669 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 670 | err = add_recvbuf_mergeable(rq, gfp); |
9ab86bbc | 671 | else if (vi->big_packets) |
012873d0 | 672 | err = add_recvbuf_big(vi, rq, gfp); |
9ab86bbc | 673 | else |
946fa564 | 674 | err = add_recvbuf_small(vi, rq, gfp); |
3f2c31d9 | 675 | |
1788f495 | 676 | oom = err == -ENOMEM; |
9ed4cb07 | 677 | if (err) |
3f2c31d9 | 678 | break; |
b7dfde95 | 679 | } while (rq->vq->num_free); |
681daee2 | 680 | virtqueue_kick(rq->vq); |
3161e453 | 681 | return !oom; |
3f2c31d9 MM |
682 | } |
683 | ||
18445c4d | 684 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
685 | { |
686 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 687 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 688 | |
18445c4d | 689 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 690 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 691 | virtqueue_disable_cb(rvq); |
e9d7417b | 692 | __napi_schedule(&rq->napi); |
18445c4d | 693 | } |
296f96fc RR |
694 | } |
695 | ||
e9d7417b | 696 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 697 | { |
e9d7417b | 698 | napi_enable(&rq->napi); |
3e9d08ec BR |
699 | |
700 | /* If all buffers were filled by other side before we napi_enabled, we | |
701 | * won't get another interrupt, so process any outstanding packets | |
702 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
703 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
704 | if (napi_schedule_prep(&rq->napi)) { |
705 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 706 | local_bh_disable(); |
e9d7417b | 707 | __napi_schedule(&rq->napi); |
ec13ee80 | 708 | local_bh_enable(); |
3e9d08ec BR |
709 | } |
710 | } | |
711 | ||
3161e453 RR |
712 | static void refill_work(struct work_struct *work) |
713 | { | |
e9d7417b JW |
714 | struct virtnet_info *vi = |
715 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 716 | bool still_empty; |
986a4f4d JW |
717 | int i; |
718 | ||
55257d72 | 719 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 720 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 721 | |
986a4f4d | 722 | napi_disable(&rq->napi); |
946fa564 | 723 | still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); |
986a4f4d | 724 | virtnet_napi_enable(rq); |
3161e453 | 725 | |
986a4f4d JW |
726 | /* In theory, this can happen: if we don't get any buffers in |
727 | * we will *never* try to fill again. | |
728 | */ | |
729 | if (still_empty) | |
730 | schedule_delayed_work(&vi->refill, HZ/2); | |
731 | } | |
3161e453 RR |
732 | } |
733 | ||
2ffa7598 | 734 | static int virtnet_receive(struct receive_queue *rq, int budget) |
296f96fc | 735 | { |
e9d7417b | 736 | struct virtnet_info *vi = rq->vq->vdev->priv; |
2ffa7598 | 737 | unsigned int len, received = 0; |
9ab86bbc | 738 | void *buf; |
296f96fc | 739 | |
296f96fc | 740 | while (received < budget && |
e9d7417b | 741 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
946fa564 | 742 | receive_buf(vi, rq, buf, len); |
296f96fc RR |
743 | received++; |
744 | } | |
745 | ||
be121f46 | 746 | if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { |
946fa564 | 747 | if (!try_fill_recv(vi, rq, GFP_ATOMIC)) |
3b07e9ca | 748 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 749 | } |
296f96fc | 750 | |
2ffa7598 JW |
751 | return received; |
752 | } | |
753 | ||
754 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
755 | { | |
756 | struct receive_queue *rq = | |
757 | container_of(napi, struct receive_queue, napi); | |
faadb05f | 758 | unsigned int r, received; |
2ffa7598 | 759 | |
faadb05f | 760 | received = virtnet_receive(rq, budget); |
2ffa7598 | 761 | |
8329d98e RR |
762 | /* Out of packets? */ |
763 | if (received < budget) { | |
cbdadbbf | 764 | r = virtqueue_enable_cb_prepare(rq->vq); |
0fbd050a | 765 | napi_complete_done(napi, received); |
cbdadbbf | 766 | if (unlikely(virtqueue_poll(rq->vq, r)) && |
8e95a202 | 767 | napi_schedule_prep(napi)) { |
e9d7417b | 768 | virtqueue_disable_cb(rq->vq); |
288379f0 | 769 | __napi_schedule(napi); |
4265f161 | 770 | } |
296f96fc RR |
771 | } |
772 | ||
773 | return received; | |
774 | } | |
775 | ||
91815639 JW |
776 | #ifdef CONFIG_NET_RX_BUSY_POLL |
777 | /* must be called with local_bh_disable()d */ | |
778 | static int virtnet_busy_poll(struct napi_struct *napi) | |
779 | { | |
780 | struct receive_queue *rq = | |
781 | container_of(napi, struct receive_queue, napi); | |
782 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
783 | int r, received = 0, budget = 4; | |
784 | ||
785 | if (!(vi->status & VIRTIO_NET_S_LINK_UP)) | |
786 | return LL_FLUSH_FAILED; | |
787 | ||
788 | if (!napi_schedule_prep(napi)) | |
789 | return LL_FLUSH_BUSY; | |
790 | ||
791 | virtqueue_disable_cb(rq->vq); | |
792 | ||
793 | again: | |
794 | received += virtnet_receive(rq, budget); | |
795 | ||
796 | r = virtqueue_enable_cb_prepare(rq->vq); | |
797 | clear_bit(NAPI_STATE_SCHED, &napi->state); | |
798 | if (unlikely(virtqueue_poll(rq->vq, r)) && | |
799 | napi_schedule_prep(napi)) { | |
800 | virtqueue_disable_cb(rq->vq); | |
801 | if (received < budget) { | |
802 | budget -= received; | |
803 | goto again; | |
804 | } else { | |
805 | __napi_schedule(napi); | |
806 | } | |
807 | } | |
808 | ||
809 | return received; | |
810 | } | |
811 | #endif /* CONFIG_NET_RX_BUSY_POLL */ | |
812 | ||
986a4f4d JW |
813 | static int virtnet_open(struct net_device *dev) |
814 | { | |
815 | struct virtnet_info *vi = netdev_priv(dev); | |
816 | int i; | |
817 | ||
e4166625 JW |
818 | for (i = 0; i < vi->max_queue_pairs; i++) { |
819 | if (i < vi->curr_queue_pairs) | |
820 | /* Make sure we have some buffers: if oom use wq. */ | |
946fa564 | 821 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
e4166625 | 822 | schedule_delayed_work(&vi->refill, 0); |
986a4f4d JW |
823 | virtnet_napi_enable(&vi->rq[i]); |
824 | } | |
825 | ||
826 | return 0; | |
827 | } | |
828 | ||
b7dfde95 | 829 | static void free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
830 | { |
831 | struct sk_buff *skb; | |
6ee57bcc | 832 | unsigned int len; |
e9d7417b | 833 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 834 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 835 | |
e9d7417b | 836 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 837 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 838 | |
83a27052 | 839 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 840 | stats->tx_bytes += skb->len; |
841 | stats->tx_packets++; | |
83a27052 | 842 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 843 | |
ed79bab8 | 844 | dev_kfree_skb_any(skb); |
296f96fc RR |
845 | } |
846 | } | |
847 | ||
e9d7417b | 848 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 849 | { |
012873d0 | 850 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
296f96fc | 851 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 852 | struct virtnet_info *vi = sq->vq->vdev->priv; |
7bedc7dc | 853 | unsigned num_sg; |
012873d0 | 854 | unsigned hdr_len = vi->hdr_len; |
e7428e95 | 855 | bool can_push; |
296f96fc | 856 | |
e174961c | 857 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
858 | |
859 | can_push = vi->any_header_sg && | |
860 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
861 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
862 | /* Even if we can, don't push here yet as this would skew | |
863 | * csum_start offset below. */ | |
864 | if (can_push) | |
012873d0 | 865 | hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); |
e7428e95 MT |
866 | else |
867 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 868 | |
296f96fc | 869 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 870 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
fdd819b2 MT |
871 | hdr->hdr.csum_start = cpu_to_virtio16(vi->vdev, |
872 | skb_checksum_start_offset(skb)); | |
873 | hdr->hdr.csum_offset = cpu_to_virtio16(vi->vdev, | |
874 | skb->csum_offset); | |
296f96fc | 875 | } else { |
b3f24698 RR |
876 | hdr->hdr.flags = 0; |
877 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
878 | } |
879 | ||
880 | if (skb_is_gso(skb)) { | |
fdd819b2 MT |
881 | hdr->hdr.hdr_len = cpu_to_virtio16(vi->vdev, skb_headlen(skb)); |
882 | hdr->hdr.gso_size = cpu_to_virtio16(vi->vdev, | |
883 | skb_shinfo(skb)->gso_size); | |
34a48579 | 884 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 885 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 886 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 887 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
e3e3c423 VY |
888 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
889 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
296f96fc RR |
890 | else |
891 | BUG(); | |
34a48579 | 892 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 893 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 894 | } else { |
b3f24698 RR |
895 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
896 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
897 | } |
898 | ||
3f2c31d9 | 899 | if (vi->mergeable_rx_bufs) |
012873d0 | 900 | hdr->num_buffers = 0; |
3f2c31d9 | 901 | |
547c890c | 902 | sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); |
e7428e95 MT |
903 | if (can_push) { |
904 | __skb_push(skb, hdr_len); | |
905 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
906 | /* Pull header back to avoid skew in tx bytes calculations. */ | |
907 | __skb_pull(skb, hdr_len); | |
908 | } else { | |
909 | sg_set_buf(sq->sg, hdr, hdr_len); | |
910 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; | |
911 | } | |
9dc7b9e4 | 912 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
913 | } |
914 | ||
424efe9c | 915 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
916 | { |
917 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
918 | int qnum = skb_get_queue_mapping(skb); |
919 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 920 | int err; |
4b7fd2e6 MT |
921 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
922 | bool kick = !skb->xmit_more; | |
2cb9c6ba | 923 | |
2cb9c6ba | 924 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 925 | free_old_xmit_skbs(sq); |
99ffc696 | 926 | |
074c3582 JK |
927 | /* timestamp packet in software */ |
928 | skb_tx_timestamp(skb); | |
929 | ||
03f191ba | 930 | /* Try to transmit */ |
b7dfde95 | 931 | err = xmit_skb(sq, skb); |
48925e37 | 932 | |
9ed4cb07 | 933 | /* This should not happen! */ |
681daee2 | 934 | if (unlikely(err)) { |
9ed4cb07 RR |
935 | dev->stats.tx_fifo_errors++; |
936 | if (net_ratelimit()) | |
937 | dev_warn(&dev->dev, | |
b7dfde95 | 938 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d | 939 | dev->stats.tx_dropped++; |
85e94525 | 940 | dev_kfree_skb_any(skb); |
58eba97d | 941 | return NETDEV_TX_OK; |
296f96fc | 942 | } |
03f191ba | 943 | |
48925e37 RR |
944 | /* Don't wait up for transmitted skbs to be freed. */ |
945 | skb_orphan(skb); | |
946 | nf_reset(skb); | |
947 | ||
60302ff6 MT |
948 | /* If running out of space, stop queue to avoid getting packets that we |
949 | * are then unable to transmit. | |
950 | * An alternative would be to force queuing layer to requeue the skb by | |
951 | * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be | |
952 | * returned in a normal path of operation: it means that driver is not | |
953 | * maintaining the TX queue stop/start state properly, and causes | |
954 | * the stack to do a non-trivial amount of useless work. | |
955 | * Since most packets only take 1 or 2 ring slots, stopping the queue | |
956 | * early means 16 slots are typically wasted. | |
d631b94e | 957 | */ |
b7dfde95 | 958 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 959 | netif_stop_subqueue(dev, qnum); |
e9d7417b | 960 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 961 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
962 | free_old_xmit_skbs(sq); |
963 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 964 | netif_start_subqueue(dev, qnum); |
e9d7417b | 965 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
966 | } |
967 | } | |
99ffc696 | 968 | } |
48925e37 | 969 | |
4b7fd2e6 | 970 | if (kick || netif_xmit_stopped(txq)) |
0b725a2c | 971 | virtqueue_kick(sq->vq); |
296f96fc | 972 | |
0b725a2c | 973 | return NETDEV_TX_OK; |
c223a078 DM |
974 | } |
975 | ||
40cbfc37 AK |
976 | /* |
977 | * Send command via the control virtqueue and check status. Commands | |
978 | * supported by the hypervisor, as indicated by feature bits, should | |
788a8b6d | 979 | * never fail unless improperly formatted. |
40cbfc37 AK |
980 | */ |
981 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
d24bae32 | 982 | struct scatterlist *out) |
40cbfc37 | 983 | { |
f7bc9594 | 984 | struct scatterlist *sgs[4], hdr, stat; |
d24bae32 | 985 | unsigned out_num = 0, tmp; |
40cbfc37 AK |
986 | |
987 | /* Caller should know better */ | |
f7bc9594 | 988 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 | 989 | |
2ac46030 MT |
990 | vi->ctrl_status = ~0; |
991 | vi->ctrl_hdr.class = class; | |
992 | vi->ctrl_hdr.cmd = cmd; | |
f7bc9594 | 993 | /* Add header */ |
2ac46030 | 994 | sg_init_one(&hdr, &vi->ctrl_hdr, sizeof(vi->ctrl_hdr)); |
f7bc9594 | 995 | sgs[out_num++] = &hdr; |
40cbfc37 | 996 | |
f7bc9594 RR |
997 | if (out) |
998 | sgs[out_num++] = out; | |
40cbfc37 | 999 | |
f7bc9594 | 1000 | /* Add return status. */ |
2ac46030 | 1001 | sg_init_one(&stat, &vi->ctrl_status, sizeof(vi->ctrl_status)); |
d24bae32 | 1002 | sgs[out_num] = &stat; |
40cbfc37 | 1003 | |
d24bae32 | 1004 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
a7c58146 | 1005 | virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
40cbfc37 | 1006 | |
67975901 | 1007 | if (unlikely(!virtqueue_kick(vi->cvq))) |
2ac46030 | 1008 | return vi->ctrl_status == VIRTIO_NET_OK; |
40cbfc37 AK |
1009 | |
1010 | /* Spin for a response, the kick causes an ioport write, trapping | |
1011 | * into the hypervisor, so the request should be handled immediately. | |
1012 | */ | |
047b9b94 HG |
1013 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
1014 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
1015 | cpu_relax(); |
1016 | ||
2ac46030 | 1017 | return vi->ctrl_status == VIRTIO_NET_OK; |
40cbfc37 AK |
1018 | } |
1019 | ||
9c46f6d4 AW |
1020 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
1021 | { | |
1022 | struct virtnet_info *vi = netdev_priv(dev); | |
1023 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 1024 | int ret; |
7e58d5ae AK |
1025 | struct sockaddr *addr = p; |
1026 | struct scatterlist sg; | |
9c46f6d4 | 1027 | |
7e58d5ae | 1028 | ret = eth_prepare_mac_addr_change(dev, p); |
f2f2c8b4 JP |
1029 | if (ret) |
1030 | return ret; | |
9c46f6d4 | 1031 | |
7e58d5ae AK |
1032 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
1033 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
1034 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1035 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
7e58d5ae AK |
1036 | dev_warn(&vdev->dev, |
1037 | "Failed to set mac address by vq command.\n"); | |
1038 | return -EINVAL; | |
1039 | } | |
7e93a02f MT |
1040 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && |
1041 | !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
855e0c52 RR |
1042 | unsigned int i; |
1043 | ||
1044 | /* Naturally, this has an atomicity problem. */ | |
1045 | for (i = 0; i < dev->addr_len; i++) | |
1046 | virtio_cwrite8(vdev, | |
1047 | offsetof(struct virtio_net_config, mac) + | |
1048 | i, addr->sa_data[i]); | |
7e58d5ae AK |
1049 | } |
1050 | ||
1051 | eth_commit_mac_addr_change(dev, p); | |
9c46f6d4 AW |
1052 | |
1053 | return 0; | |
1054 | } | |
1055 | ||
3fa2a1df | 1056 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
1057 | struct rtnl_link_stats64 *tot) | |
1058 | { | |
1059 | struct virtnet_info *vi = netdev_priv(dev); | |
1060 | int cpu; | |
1061 | unsigned int start; | |
1062 | ||
1063 | for_each_possible_cpu(cpu) { | |
58472a76 | 1064 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 1065 | u64 tpackets, tbytes, rpackets, rbytes; |
1066 | ||
1067 | do { | |
57a7744e | 1068 | start = u64_stats_fetch_begin_irq(&stats->tx_syncp); |
3fa2a1df | 1069 | tpackets = stats->tx_packets; |
1070 | tbytes = stats->tx_bytes; | |
57a7744e | 1071 | } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); |
83a27052 ED |
1072 | |
1073 | do { | |
57a7744e | 1074 | start = u64_stats_fetch_begin_irq(&stats->rx_syncp); |
3fa2a1df | 1075 | rpackets = stats->rx_packets; |
1076 | rbytes = stats->rx_bytes; | |
57a7744e | 1077 | } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); |
3fa2a1df | 1078 | |
1079 | tot->rx_packets += rpackets; | |
1080 | tot->tx_packets += tpackets; | |
1081 | tot->rx_bytes += rbytes; | |
1082 | tot->tx_bytes += tbytes; | |
1083 | } | |
1084 | ||
1085 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 1086 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 1087 | tot->rx_dropped = dev->stats.rx_dropped; |
1088 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
1089 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
1090 | ||
1091 | return tot; | |
1092 | } | |
1093 | ||
da74e89d AS |
1094 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1095 | static void virtnet_netpoll(struct net_device *dev) | |
1096 | { | |
1097 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1098 | int i; |
da74e89d | 1099 | |
986a4f4d JW |
1100 | for (i = 0; i < vi->curr_queue_pairs; i++) |
1101 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
1102 | } |
1103 | #endif | |
1104 | ||
586d17c5 JW |
1105 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
1106 | { | |
1107 | rtnl_lock(); | |
1108 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
d24bae32 | 1109 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
586d17c5 JW |
1110 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
1111 | rtnl_unlock(); | |
1112 | } | |
1113 | ||
986a4f4d JW |
1114 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
1115 | { | |
1116 | struct scatterlist sg; | |
1117 | struct virtio_net_ctrl_mq s; | |
1118 | struct net_device *dev = vi->dev; | |
1119 | ||
1120 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
1121 | return 0; | |
1122 | ||
fdd819b2 | 1123 | s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
986a4f4d JW |
1124 | sg_init_one(&sg, &s, sizeof(s)); |
1125 | ||
1126 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
d24bae32 | 1127 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
986a4f4d JW |
1128 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
1129 | queue_pairs); | |
1130 | return -EINVAL; | |
55257d72 | 1131 | } else { |
986a4f4d | 1132 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
1133 | /* virtnet_open() will refill when device is going to up. */ |
1134 | if (dev->flags & IFF_UP) | |
1135 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 1136 | } |
986a4f4d JW |
1137 | |
1138 | return 0; | |
1139 | } | |
1140 | ||
296f96fc RR |
1141 | static int virtnet_close(struct net_device *dev) |
1142 | { | |
1143 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1144 | int i; |
296f96fc | 1145 | |
b2baed69 RR |
1146 | /* Make sure refill_work doesn't re-enable napi! */ |
1147 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d JW |
1148 | |
1149 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1150 | napi_disable(&vi->rq[i].napi); | |
296f96fc | 1151 | |
296f96fc RR |
1152 | return 0; |
1153 | } | |
1154 | ||
2af7698e AW |
1155 | static void virtnet_set_rx_mode(struct net_device *dev) |
1156 | { | |
1157 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 1158 | struct scatterlist sg[2]; |
f565a7c2 | 1159 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 1160 | struct netdev_hw_addr *ha; |
32e7bfc4 | 1161 | int uc_count; |
4cd24eaf | 1162 | int mc_count; |
f565a7c2 AW |
1163 | void *buf; |
1164 | int i; | |
2af7698e | 1165 | |
788a8b6d | 1166 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
2af7698e AW |
1167 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
1168 | return; | |
1169 | ||
2ac46030 MT |
1170 | vi->ctrl_promisc = ((dev->flags & IFF_PROMISC) != 0); |
1171 | vi->ctrl_allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1172 | |
2ac46030 | 1173 | sg_init_one(sg, &vi->ctrl_promisc, sizeof(vi->ctrl_promisc)); |
2af7698e AW |
1174 | |
1175 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1176 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
2af7698e | 1177 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
2ac46030 | 1178 | vi->ctrl_promisc ? "en" : "dis"); |
2af7698e | 1179 | |
2ac46030 | 1180 | sg_init_one(sg, &vi->ctrl_allmulti, sizeof(vi->ctrl_allmulti)); |
2af7698e AW |
1181 | |
1182 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1183 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
2af7698e | 1184 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
2ac46030 | 1185 | vi->ctrl_allmulti ? "en" : "dis"); |
f565a7c2 | 1186 | |
32e7bfc4 | 1187 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1188 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1189 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1190 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1191 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1192 | mac_data = buf; | |
e68ed8f0 | 1193 | if (!buf) |
f565a7c2 | 1194 | return; |
f565a7c2 | 1195 | |
23e258e1 AW |
1196 | sg_init_table(sg, 2); |
1197 | ||
f565a7c2 | 1198 | /* Store the unicast list and count in the front of the buffer */ |
fdd819b2 | 1199 | mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); |
ccffad25 | 1200 | i = 0; |
32e7bfc4 | 1201 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1202 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1203 | |
1204 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1205 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1206 | |
1207 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1208 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1209 | |
fdd819b2 | 1210 | mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); |
567ec874 | 1211 | i = 0; |
22bedad3 JP |
1212 | netdev_for_each_mc_addr(ha, dev) |
1213 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1214 | |
1215 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1216 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1217 | |
1218 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1219 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
99e872ae | 1220 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
f565a7c2 AW |
1221 | |
1222 | kfree(buf); | |
2af7698e AW |
1223 | } |
1224 | ||
80d5c368 PM |
1225 | static int virtnet_vlan_rx_add_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_ADD, &sg)) |
0bde9569 | 1235 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1236 | return 0; |
0bde9569 AW |
1237 | } |
1238 | ||
80d5c368 PM |
1239 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1240 | __be16 proto, u16 vid) | |
0bde9569 AW |
1241 | { |
1242 | struct virtnet_info *vi = netdev_priv(dev); | |
1243 | struct scatterlist sg; | |
1244 | ||
23e258e1 | 1245 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1246 | |
1247 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1248 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
0bde9569 | 1249 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1250 | return 0; |
0bde9569 AW |
1251 | } |
1252 | ||
8898c21c | 1253 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
986a4f4d JW |
1254 | { |
1255 | int i; | |
1256 | ||
8898c21c WG |
1257 | if (vi->affinity_hint_set) { |
1258 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
47be2479 WG |
1259 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
1260 | virtqueue_set_affinity(vi->sq[i].vq, -1); | |
1261 | } | |
1262 | ||
8898c21c WG |
1263 | vi->affinity_hint_set = false; |
1264 | } | |
8898c21c | 1265 | } |
47be2479 | 1266 | |
8898c21c WG |
1267 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1268 | { | |
1269 | int i; | |
1270 | int cpu; | |
986a4f4d JW |
1271 | |
1272 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1273 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1274 | * setting the affinity hint to eliminate the contention. | |
1275 | */ | |
8898c21c WG |
1276 | if (vi->curr_queue_pairs == 1 || |
1277 | vi->max_queue_pairs != num_online_cpus()) { | |
1278 | virtnet_clean_affinity(vi, -1); | |
1279 | return; | |
986a4f4d JW |
1280 | } |
1281 | ||
8898c21c WG |
1282 | i = 0; |
1283 | for_each_online_cpu(cpu) { | |
986a4f4d JW |
1284 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
1285 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
9bb8ca86 | 1286 | netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); |
8898c21c | 1287 | i++; |
986a4f4d JW |
1288 | } |
1289 | ||
8898c21c | 1290 | vi->affinity_hint_set = true; |
986a4f4d JW |
1291 | } |
1292 | ||
8de4b2f3 WG |
1293 | static int virtnet_cpu_callback(struct notifier_block *nfb, |
1294 | unsigned long action, void *hcpu) | |
1295 | { | |
1296 | struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); | |
1297 | ||
1298 | switch(action & ~CPU_TASKS_FROZEN) { | |
1299 | case CPU_ONLINE: | |
1300 | case CPU_DOWN_FAILED: | |
1301 | case CPU_DEAD: | |
1302 | virtnet_set_affinity(vi); | |
1303 | break; | |
1304 | case CPU_DOWN_PREPARE: | |
1305 | virtnet_clean_affinity(vi, (long)hcpu); | |
1306 | break; | |
1307 | default: | |
1308 | break; | |
1309 | } | |
3ab098df | 1310 | |
8de4b2f3 | 1311 | return NOTIFY_OK; |
986a4f4d JW |
1312 | } |
1313 | ||
8f9f4668 RJ |
1314 | static void virtnet_get_ringparam(struct net_device *dev, |
1315 | struct ethtool_ringparam *ring) | |
1316 | { | |
1317 | struct virtnet_info *vi = netdev_priv(dev); | |
1318 | ||
986a4f4d JW |
1319 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1320 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1321 | ring->rx_pending = ring->rx_max_pending; |
1322 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1323 | } |
1324 | ||
66846048 RJ |
1325 | |
1326 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1327 | struct ethtool_drvinfo *info) | |
1328 | { | |
1329 | struct virtnet_info *vi = netdev_priv(dev); | |
1330 | struct virtio_device *vdev = vi->vdev; | |
1331 | ||
1332 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1333 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1334 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1335 | ||
1336 | } | |
1337 | ||
d73bcd2c JW |
1338 | /* TODO: Eliminate OOO packets during switching */ |
1339 | static int virtnet_set_channels(struct net_device *dev, | |
1340 | struct ethtool_channels *channels) | |
1341 | { | |
1342 | struct virtnet_info *vi = netdev_priv(dev); | |
1343 | u16 queue_pairs = channels->combined_count; | |
1344 | int err; | |
1345 | ||
1346 | /* We don't support separate rx/tx channels. | |
1347 | * We don't allow setting 'other' channels. | |
1348 | */ | |
1349 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1350 | return -EINVAL; | |
1351 | ||
c18e9cd6 | 1352 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
d73bcd2c JW |
1353 | return -EINVAL; |
1354 | ||
47be2479 | 1355 | get_online_cpus(); |
d73bcd2c JW |
1356 | err = virtnet_set_queues(vi, queue_pairs); |
1357 | if (!err) { | |
1358 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1359 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1360 | ||
8898c21c | 1361 | virtnet_set_affinity(vi); |
d73bcd2c | 1362 | } |
47be2479 | 1363 | put_online_cpus(); |
d73bcd2c JW |
1364 | |
1365 | return err; | |
1366 | } | |
1367 | ||
1368 | static void virtnet_get_channels(struct net_device *dev, | |
1369 | struct ethtool_channels *channels) | |
1370 | { | |
1371 | struct virtnet_info *vi = netdev_priv(dev); | |
1372 | ||
1373 | channels->combined_count = vi->curr_queue_pairs; | |
1374 | channels->max_combined = vi->max_queue_pairs; | |
1375 | channels->max_other = 0; | |
1376 | channels->rx_count = 0; | |
1377 | channels->tx_count = 0; | |
1378 | channels->other_count = 0; | |
1379 | } | |
1380 | ||
0fc0b732 | 1381 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1382 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1383 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1384 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1385 | .set_channels = virtnet_set_channels, |
1386 | .get_channels = virtnet_get_channels, | |
074c3582 | 1387 | .get_ts_info = ethtool_op_get_ts_info, |
a9ea3fc6 HX |
1388 | }; |
1389 | ||
39da5814 MM |
1390 | #define MIN_MTU 68 |
1391 | #define MAX_MTU 65535 | |
1392 | ||
1393 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
1394 | { | |
1395 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
1396 | return -EINVAL; | |
1397 | dev->mtu = new_mtu; | |
1398 | return 0; | |
1399 | } | |
1400 | ||
76288b4e SH |
1401 | static const struct net_device_ops virtnet_netdev = { |
1402 | .ndo_open = virtnet_open, | |
1403 | .ndo_stop = virtnet_close, | |
1404 | .ndo_start_xmit = start_xmit, | |
1405 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1406 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1407 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 1408 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 1409 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1410 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1411 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
1412 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1413 | .ndo_poll_controller = virtnet_netpoll, | |
1414 | #endif | |
91815639 JW |
1415 | #ifdef CONFIG_NET_RX_BUSY_POLL |
1416 | .ndo_busy_poll = virtnet_busy_poll, | |
1417 | #endif | |
76288b4e SH |
1418 | }; |
1419 | ||
586d17c5 | 1420 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1421 | { |
586d17c5 JW |
1422 | struct virtnet_info *vi = |
1423 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1424 | u16 v; |
1425 | ||
855e0c52 RR |
1426 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
1427 | struct virtio_net_config, status, &v) < 0) | |
507613bf | 1428 | return; |
586d17c5 JW |
1429 | |
1430 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1431 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1432 | virtnet_ack_link_announce(vi); |
1433 | } | |
9f4d26d0 MM |
1434 | |
1435 | /* Ignore unknown (future) status bits */ | |
1436 | v &= VIRTIO_NET_S_LINK_UP; | |
1437 | ||
1438 | if (vi->status == v) | |
507613bf | 1439 | return; |
9f4d26d0 MM |
1440 | |
1441 | vi->status = v; | |
1442 | ||
1443 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1444 | netif_carrier_on(vi->dev); | |
986a4f4d | 1445 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
1446 | } else { |
1447 | netif_carrier_off(vi->dev); | |
986a4f4d | 1448 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 MM |
1449 | } |
1450 | } | |
1451 | ||
1452 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1453 | { | |
1454 | struct virtnet_info *vi = vdev->priv; | |
1455 | ||
3b07e9ca | 1456 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1457 | } |
1458 | ||
986a4f4d JW |
1459 | static void virtnet_free_queues(struct virtnet_info *vi) |
1460 | { | |
d4fb84ee AV |
1461 | int i; |
1462 | ||
ab3971b1 JW |
1463 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1464 | napi_hash_del(&vi->rq[i].napi); | |
d4fb84ee | 1465 | netif_napi_del(&vi->rq[i].napi); |
ab3971b1 | 1466 | } |
d4fb84ee | 1467 | |
986a4f4d JW |
1468 | kfree(vi->rq); |
1469 | kfree(vi->sq); | |
1470 | } | |
1471 | ||
1472 | static void free_receive_bufs(struct virtnet_info *vi) | |
1473 | { | |
1474 | int i; | |
1475 | ||
1476 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1477 | while (vi->rq[i].pages) | |
1478 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
1479 | } | |
1480 | } | |
1481 | ||
fb51879d MD |
1482 | static void free_receive_page_frags(struct virtnet_info *vi) |
1483 | { | |
1484 | int i; | |
1485 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1486 | if (vi->rq[i].alloc_frag.page) | |
1487 | put_page(vi->rq[i].alloc_frag.page); | |
1488 | } | |
1489 | ||
986a4f4d JW |
1490 | static void free_unused_bufs(struct virtnet_info *vi) |
1491 | { | |
1492 | void *buf; | |
1493 | int i; | |
1494 | ||
1495 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1496 | struct virtqueue *vq = vi->sq[i].vq; | |
1497 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) | |
1498 | dev_kfree_skb(buf); | |
1499 | } | |
1500 | ||
1501 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1502 | struct virtqueue *vq = vi->rq[i].vq; | |
1503 | ||
1504 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
ab7db917 MD |
1505 | if (vi->mergeable_rx_bufs) { |
1506 | unsigned long ctx = (unsigned long)buf; | |
1507 | void *base = mergeable_ctx_to_buf_address(ctx); | |
1508 | put_page(virt_to_head_page(base)); | |
1509 | } else if (vi->big_packets) { | |
fa9fac17 | 1510 | give_pages(&vi->rq[i], buf); |
ab7db917 | 1511 | } else { |
986a4f4d | 1512 | dev_kfree_skb(buf); |
ab7db917 | 1513 | } |
986a4f4d | 1514 | } |
986a4f4d JW |
1515 | } |
1516 | } | |
1517 | ||
e9d7417b JW |
1518 | static void virtnet_del_vqs(struct virtnet_info *vi) |
1519 | { | |
1520 | struct virtio_device *vdev = vi->vdev; | |
1521 | ||
8898c21c | 1522 | virtnet_clean_affinity(vi, -1); |
986a4f4d | 1523 | |
e9d7417b | 1524 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
1525 | |
1526 | virtnet_free_queues(vi); | |
e9d7417b JW |
1527 | } |
1528 | ||
986a4f4d | 1529 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 1530 | { |
986a4f4d JW |
1531 | vq_callback_t **callbacks; |
1532 | struct virtqueue **vqs; | |
1533 | int ret = -ENOMEM; | |
1534 | int i, total_vqs; | |
1535 | const char **names; | |
1536 | ||
1537 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
1538 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
1539 | * possible control vq. | |
1540 | */ | |
1541 | total_vqs = vi->max_queue_pairs * 2 + | |
1542 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
1543 | ||
1544 | /* Allocate space for find_vqs parameters */ | |
1545 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
1546 | if (!vqs) | |
1547 | goto err_vq; | |
1548 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
1549 | if (!callbacks) | |
1550 | goto err_callback; | |
1551 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
1552 | if (!names) | |
1553 | goto err_names; | |
1554 | ||
1555 | /* Parameters for control virtqueue, if any */ | |
1556 | if (vi->has_cvq) { | |
1557 | callbacks[total_vqs - 1] = NULL; | |
1558 | names[total_vqs - 1] = "control"; | |
1559 | } | |
3f9c10b0 | 1560 | |
986a4f4d JW |
1561 | /* Allocate/initialize parameters for send/receive virtqueues */ |
1562 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1563 | callbacks[rxq2vq(i)] = skb_recv_done; | |
1564 | callbacks[txq2vq(i)] = skb_xmit_done; | |
1565 | sprintf(vi->rq[i].name, "input.%d", i); | |
1566 | sprintf(vi->sq[i].name, "output.%d", i); | |
1567 | names[rxq2vq(i)] = vi->rq[i].name; | |
1568 | names[txq2vq(i)] = vi->sq[i].name; | |
1569 | } | |
3f9c10b0 | 1570 | |
986a4f4d JW |
1571 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
1572 | names); | |
1573 | if (ret) | |
1574 | goto err_find; | |
3f9c10b0 | 1575 | |
986a4f4d JW |
1576 | if (vi->has_cvq) { |
1577 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 1578 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 1579 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 1580 | } |
986a4f4d JW |
1581 | |
1582 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1583 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
1584 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
1585 | } | |
1586 | ||
1587 | kfree(names); | |
1588 | kfree(callbacks); | |
1589 | kfree(vqs); | |
1590 | ||
3f9c10b0 | 1591 | return 0; |
986a4f4d JW |
1592 | |
1593 | err_find: | |
1594 | kfree(names); | |
1595 | err_names: | |
1596 | kfree(callbacks); | |
1597 | err_callback: | |
1598 | kfree(vqs); | |
1599 | err_vq: | |
1600 | return ret; | |
1601 | } | |
1602 | ||
1603 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
1604 | { | |
1605 | int i; | |
1606 | ||
1607 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
1608 | if (!vi->sq) | |
1609 | goto err_sq; | |
1610 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 1611 | if (!vi->rq) |
986a4f4d JW |
1612 | goto err_rq; |
1613 | ||
1614 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
1615 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1616 | vi->rq[i].pages = NULL; | |
1617 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
1618 | napi_weight); | |
91815639 | 1619 | napi_hash_add(&vi->rq[i].napi); |
986a4f4d JW |
1620 | |
1621 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
5377d758 | 1622 | ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); |
986a4f4d JW |
1623 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); |
1624 | } | |
1625 | ||
1626 | return 0; | |
1627 | ||
1628 | err_rq: | |
1629 | kfree(vi->sq); | |
1630 | err_sq: | |
1631 | return -ENOMEM; | |
1632 | } | |
1633 | ||
1634 | static int init_vqs(struct virtnet_info *vi) | |
1635 | { | |
1636 | int ret; | |
1637 | ||
1638 | /* Allocate send & receive queues */ | |
1639 | ret = virtnet_alloc_queues(vi); | |
1640 | if (ret) | |
1641 | goto err; | |
1642 | ||
1643 | ret = virtnet_find_vqs(vi); | |
1644 | if (ret) | |
1645 | goto err_free; | |
1646 | ||
47be2479 | 1647 | get_online_cpus(); |
8898c21c | 1648 | virtnet_set_affinity(vi); |
47be2479 WG |
1649 | put_online_cpus(); |
1650 | ||
986a4f4d JW |
1651 | return 0; |
1652 | ||
1653 | err_free: | |
1654 | virtnet_free_queues(vi); | |
1655 | err: | |
1656 | return ret; | |
3f9c10b0 AS |
1657 | } |
1658 | ||
fbf28d78 MD |
1659 | #ifdef CONFIG_SYSFS |
1660 | static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, | |
1661 | struct rx_queue_attribute *attribute, char *buf) | |
1662 | { | |
1663 | struct virtnet_info *vi = netdev_priv(queue->dev); | |
1664 | unsigned int queue_index = get_netdev_rx_queue_index(queue); | |
5377d758 | 1665 | struct ewma_pkt_len *avg; |
fbf28d78 MD |
1666 | |
1667 | BUG_ON(queue_index >= vi->max_queue_pairs); | |
1668 | avg = &vi->rq[queue_index].mrg_avg_pkt_len; | |
1669 | return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); | |
1670 | } | |
1671 | ||
1672 | static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = | |
1673 | __ATTR_RO(mergeable_rx_buffer_size); | |
1674 | ||
1675 | static struct attribute *virtio_net_mrg_rx_attrs[] = { | |
1676 | &mergeable_rx_buffer_size_attribute.attr, | |
1677 | NULL | |
1678 | }; | |
1679 | ||
1680 | static const struct attribute_group virtio_net_mrg_rx_group = { | |
1681 | .name = "virtio_net", | |
1682 | .attrs = virtio_net_mrg_rx_attrs | |
1683 | }; | |
1684 | #endif | |
1685 | ||
892d6eb1 JW |
1686 | static bool virtnet_fail_on_feature(struct virtio_device *vdev, |
1687 | unsigned int fbit, | |
1688 | const char *fname, const char *dname) | |
1689 | { | |
1690 | if (!virtio_has_feature(vdev, fbit)) | |
1691 | return false; | |
1692 | ||
1693 | dev_err(&vdev->dev, "device advertises feature %s but not %s", | |
1694 | fname, dname); | |
1695 | ||
1696 | return true; | |
1697 | } | |
1698 | ||
1699 | #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ | |
1700 | virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) | |
1701 | ||
1702 | static bool virtnet_validate_features(struct virtio_device *vdev) | |
1703 | { | |
1704 | if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && | |
1705 | (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, | |
1706 | "VIRTIO_NET_F_CTRL_VQ") || | |
1707 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, | |
1708 | "VIRTIO_NET_F_CTRL_VQ") || | |
1709 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, | |
1710 | "VIRTIO_NET_F_CTRL_VQ") || | |
1711 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || | |
1712 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, | |
1713 | "VIRTIO_NET_F_CTRL_VQ"))) { | |
1714 | return false; | |
1715 | } | |
1716 | ||
1717 | return true; | |
1718 | } | |
1719 | ||
296f96fc RR |
1720 | static int virtnet_probe(struct virtio_device *vdev) |
1721 | { | |
986a4f4d | 1722 | int i, err; |
296f96fc RR |
1723 | struct net_device *dev; |
1724 | struct virtnet_info *vi; | |
986a4f4d JW |
1725 | u16 max_queue_pairs; |
1726 | ||
6ba42248 MT |
1727 | if (!vdev->config->get) { |
1728 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
1729 | __func__); | |
1730 | return -EINVAL; | |
1731 | } | |
1732 | ||
892d6eb1 JW |
1733 | if (!virtnet_validate_features(vdev)) |
1734 | return -EINVAL; | |
1735 | ||
986a4f4d | 1736 | /* Find if host supports multiqueue virtio_net device */ |
855e0c52 RR |
1737 | err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, |
1738 | struct virtio_net_config, | |
1739 | max_virtqueue_pairs, &max_queue_pairs); | |
986a4f4d JW |
1740 | |
1741 | /* We need at least 2 queue's */ | |
1742 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
1743 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
1744 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
1745 | max_queue_pairs = 1; | |
296f96fc RR |
1746 | |
1747 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 1748 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
1749 | if (!dev) |
1750 | return -ENOMEM; | |
1751 | ||
1752 | /* Set up network device as normal. */ | |
f2f2c8b4 | 1753 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 1754 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1755 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1756 | |
7ad24ea4 | 1757 | dev->ethtool_ops = &virtnet_ethtool_ops; |
296f96fc RR |
1758 | SET_NETDEV_DEV(dev, &vdev->dev); |
1759 | ||
1760 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1761 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1762 | /* This opens up the world of extra features. */ |
48900cb6 | 1763 | dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 | 1764 | if (csum) |
48900cb6 | 1765 | dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 MM |
1766 | |
1767 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
e3e3c423 | 1768 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO |
34a48579 RR |
1769 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1770 | } | |
5539ae96 | 1771 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1772 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1773 | dev->hw_features |= NETIF_F_TSO; | |
1774 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1775 | dev->hw_features |= NETIF_F_TSO6; | |
1776 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1777 | dev->hw_features |= NETIF_F_TSO_ECN; | |
e3e3c423 VY |
1778 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
1779 | dev->hw_features |= NETIF_F_UFO; | |
98e778c9 | 1780 | |
41f2f127 JW |
1781 | dev->features |= NETIF_F_GSO_ROBUST; |
1782 | ||
98e778c9 | 1783 | if (gso) |
e3e3c423 | 1784 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); |
98e778c9 | 1785 | /* (!csum && gso) case will be fixed by register_netdev() */ |
296f96fc | 1786 | } |
4f49129b TH |
1787 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
1788 | dev->features |= NETIF_F_RXCSUM; | |
296f96fc | 1789 | |
4fda8302 JW |
1790 | dev->vlan_features = dev->features; |
1791 | ||
296f96fc | 1792 | /* Configuration may specify what MAC to use. Otherwise random. */ |
855e0c52 RR |
1793 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
1794 | virtio_cread_bytes(vdev, | |
1795 | offsetof(struct virtio_net_config, mac), | |
1796 | dev->dev_addr, dev->addr_len); | |
1797 | else | |
f2cedb63 | 1798 | eth_hw_addr_random(dev); |
296f96fc RR |
1799 | |
1800 | /* Set up our device-specific information */ | |
1801 | vi = netdev_priv(dev); | |
296f96fc RR |
1802 | vi->dev = dev; |
1803 | vi->vdev = vdev; | |
d9d5dcc8 | 1804 | vdev->priv = vi; |
3fa2a1df | 1805 | vi->stats = alloc_percpu(struct virtnet_stats); |
1806 | err = -ENOMEM; | |
1807 | if (vi->stats == NULL) | |
1808 | goto free; | |
1809 | ||
827da44c JS |
1810 | for_each_possible_cpu(i) { |
1811 | struct virtnet_stats *virtnet_stats; | |
1812 | virtnet_stats = per_cpu_ptr(vi->stats, i); | |
1813 | u64_stats_init(&virtnet_stats->tx_syncp); | |
1814 | u64_stats_init(&virtnet_stats->rx_syncp); | |
1815 | } | |
1816 | ||
586d17c5 | 1817 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); |
296f96fc | 1818 | |
97402b96 | 1819 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1820 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1821 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
e3e3c423 VY |
1822 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
1823 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) | |
97402b96 HX |
1824 | vi->big_packets = true; |
1825 | ||
3f2c31d9 MM |
1826 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1827 | vi->mergeable_rx_bufs = true; | |
1828 | ||
d04302b3 MT |
1829 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || |
1830 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
012873d0 MT |
1831 | vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
1832 | else | |
1833 | vi->hdr_len = sizeof(struct virtio_net_hdr); | |
1834 | ||
75993300 MT |
1835 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || |
1836 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
e7428e95 MT |
1837 | vi->any_header_sg = true; |
1838 | ||
986a4f4d JW |
1839 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
1840 | vi->has_cvq = true; | |
1841 | ||
012873d0 MT |
1842 | if (vi->any_header_sg) |
1843 | dev->needed_headroom = vi->hdr_len; | |
6ebbc1a6 | 1844 | |
986a4f4d JW |
1845 | /* Use single tx/rx queue pair as default */ |
1846 | vi->curr_queue_pairs = 1; | |
1847 | vi->max_queue_pairs = max_queue_pairs; | |
1848 | ||
1849 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 1850 | err = init_vqs(vi); |
d2a7ddda | 1851 | if (err) |
9bb8ca86 | 1852 | goto free_stats; |
296f96fc | 1853 | |
fbf28d78 MD |
1854 | #ifdef CONFIG_SYSFS |
1855 | if (vi->mergeable_rx_bufs) | |
1856 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; | |
1857 | #endif | |
0f13b66b ZYW |
1858 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
1859 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); | |
986a4f4d | 1860 | |
296f96fc RR |
1861 | err = register_netdev(dev); |
1862 | if (err) { | |
1863 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1864 | goto free_vqs; |
296f96fc | 1865 | } |
b3369c1f | 1866 | |
4baf1e33 MT |
1867 | virtio_device_ready(vdev); |
1868 | ||
b3369c1f | 1869 | /* Last of all, set up some receive buffers. */ |
55257d72 | 1870 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
946fa564 | 1871 | try_fill_recv(vi, &vi->rq[i], GFP_KERNEL); |
986a4f4d JW |
1872 | |
1873 | /* If we didn't even get one input buffer, we're useless. */ | |
be121f46 JW |
1874 | if (vi->rq[i].vq->num_free == |
1875 | virtqueue_get_vring_size(vi->rq[i].vq)) { | |
986a4f4d JW |
1876 | free_unused_bufs(vi); |
1877 | err = -ENOMEM; | |
1878 | goto free_recv_bufs; | |
1879 | } | |
b3369c1f RR |
1880 | } |
1881 | ||
8de4b2f3 WG |
1882 | vi->nb.notifier_call = &virtnet_cpu_callback; |
1883 | err = register_hotcpu_notifier(&vi->nb); | |
1884 | if (err) { | |
1885 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
1886 | goto free_recv_bufs; | |
1887 | } | |
1888 | ||
167c25e4 JW |
1889 | /* Assume link up if device can't report link status, |
1890 | otherwise get link status from config. */ | |
1891 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1892 | netif_carrier_off(dev); | |
3b07e9ca | 1893 | schedule_work(&vi->config_work); |
167c25e4 JW |
1894 | } else { |
1895 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1896 | netif_carrier_on(dev); | |
1897 | } | |
9f4d26d0 | 1898 | |
986a4f4d JW |
1899 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
1900 | dev->name, max_queue_pairs); | |
1901 | ||
296f96fc RR |
1902 | return 0; |
1903 | ||
986a4f4d | 1904 | free_recv_bufs: |
02465555 MT |
1905 | vi->vdev->config->reset(vdev); |
1906 | ||
986a4f4d | 1907 | free_receive_bufs(vi); |
b3369c1f | 1908 | unregister_netdev(dev); |
d2a7ddda | 1909 | free_vqs: |
986a4f4d | 1910 | cancel_delayed_work_sync(&vi->refill); |
fb51879d | 1911 | free_receive_page_frags(vi); |
e9d7417b | 1912 | virtnet_del_vqs(vi); |
3fa2a1df | 1913 | free_stats: |
1914 | free_percpu(vi->stats); | |
296f96fc RR |
1915 | free: |
1916 | free_netdev(dev); | |
1917 | return err; | |
1918 | } | |
1919 | ||
04486ed0 | 1920 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1921 | { |
04486ed0 | 1922 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1923 | |
1924 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1925 | free_unused_bufs(vi); |
fb6813f4 | 1926 | |
986a4f4d | 1927 | free_receive_bufs(vi); |
d2a7ddda | 1928 | |
fb51879d MD |
1929 | free_receive_page_frags(vi); |
1930 | ||
986a4f4d | 1931 | virtnet_del_vqs(vi); |
04486ed0 AS |
1932 | } |
1933 | ||
8cc085d6 | 1934 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
1935 | { |
1936 | struct virtnet_info *vi = vdev->priv; | |
1937 | ||
8de4b2f3 WG |
1938 | unregister_hotcpu_notifier(&vi->nb); |
1939 | ||
102a2786 MT |
1940 | /* Make sure no work handler is accessing the device. */ |
1941 | flush_work(&vi->config_work); | |
586d17c5 | 1942 | |
04486ed0 AS |
1943 | unregister_netdev(vi->dev); |
1944 | ||
1945 | remove_vq_common(vi); | |
fb6813f4 | 1946 | |
2e66f55b | 1947 | free_percpu(vi->stats); |
74b2553f | 1948 | free_netdev(vi->dev); |
296f96fc RR |
1949 | } |
1950 | ||
89107000 | 1951 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
1952 | static int virtnet_freeze(struct virtio_device *vdev) |
1953 | { | |
1954 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1955 | int i; |
0741bcb5 | 1956 | |
ec9debbd JW |
1957 | unregister_hotcpu_notifier(&vi->nb); |
1958 | ||
102a2786 MT |
1959 | /* Make sure no work handler is accessing the device */ |
1960 | flush_work(&vi->config_work); | |
586d17c5 | 1961 | |
0741bcb5 AS |
1962 | netif_device_detach(vi->dev); |
1963 | cancel_delayed_work_sync(&vi->refill); | |
1964 | ||
91815639 | 1965 | if (netif_running(vi->dev)) { |
ab3971b1 | 1966 | for (i = 0; i < vi->max_queue_pairs; i++) |
986a4f4d | 1967 | napi_disable(&vi->rq[i].napi); |
91815639 | 1968 | } |
0741bcb5 AS |
1969 | |
1970 | remove_vq_common(vi); | |
1971 | ||
1972 | return 0; | |
1973 | } | |
1974 | ||
1975 | static int virtnet_restore(struct virtio_device *vdev) | |
1976 | { | |
1977 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1978 | int err, i; |
0741bcb5 AS |
1979 | |
1980 | err = init_vqs(vi); | |
1981 | if (err) | |
1982 | return err; | |
1983 | ||
e53fbd11 MT |
1984 | virtio_device_ready(vdev); |
1985 | ||
6cd4ce00 JW |
1986 | if (netif_running(vi->dev)) { |
1987 | for (i = 0; i < vi->curr_queue_pairs; i++) | |
946fa564 | 1988 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
6cd4ce00 JW |
1989 | schedule_delayed_work(&vi->refill, 0); |
1990 | ||
986a4f4d JW |
1991 | for (i = 0; i < vi->max_queue_pairs; i++) |
1992 | virtnet_napi_enable(&vi->rq[i]); | |
6cd4ce00 | 1993 | } |
0741bcb5 AS |
1994 | |
1995 | netif_device_attach(vi->dev); | |
1996 | ||
35ed159b | 1997 | rtnl_lock(); |
986a4f4d | 1998 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
35ed159b | 1999 | rtnl_unlock(); |
986a4f4d | 2000 | |
ec9debbd JW |
2001 | err = register_hotcpu_notifier(&vi->nb); |
2002 | if (err) | |
2003 | return err; | |
2004 | ||
0741bcb5 AS |
2005 | return 0; |
2006 | } | |
2007 | #endif | |
2008 | ||
296f96fc RR |
2009 | static struct virtio_device_id id_table[] = { |
2010 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
2011 | { 0 }, | |
2012 | }; | |
2013 | ||
c45a6816 | 2014 | static unsigned int features[] = { |
5e4fe5c4 MM |
2015 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
2016 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
e3e3c423 | 2017 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 2018 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
e3e3c423 | 2019 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 2020 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 2021 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
986a4f4d | 2022 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, |
7e58d5ae | 2023 | VIRTIO_NET_F_CTRL_MAC_ADDR, |
e7428e95 | 2024 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
2025 | }; |
2026 | ||
22402529 | 2027 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
2028 | .feature_table = features, |
2029 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
2030 | .driver.name = KBUILD_MODNAME, |
2031 | .driver.owner = THIS_MODULE, | |
2032 | .id_table = id_table, | |
2033 | .probe = virtnet_probe, | |
8cc085d6 | 2034 | .remove = virtnet_remove, |
9f4d26d0 | 2035 | .config_changed = virtnet_config_changed, |
89107000 | 2036 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
2037 | .freeze = virtnet_freeze, |
2038 | .restore = virtnet_restore, | |
2039 | #endif | |
296f96fc RR |
2040 | }; |
2041 | ||
b2a17029 | 2042 | module_virtio_driver(virtio_net_driver); |
296f96fc RR |
2043 | |
2044 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2045 | MODULE_DESCRIPTION("Virtio network driver"); | |
2046 | MODULE_LICENSE("GPL"); |