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; | |
16032be5 NA |
149 | |
150 | /* Ethtool settings */ | |
151 | u8 duplex; | |
152 | u32 speed; | |
296f96fc RR |
153 | }; |
154 | ||
9ab86bbc | 155 | struct padded_vnet_hdr { |
012873d0 | 156 | struct virtio_net_hdr_mrg_rxbuf hdr; |
9ab86bbc | 157 | /* |
012873d0 MT |
158 | * hdr is in a separate sg buffer, and data sg buffer shares same page |
159 | * with this header sg. This padding makes next sg 16 byte aligned | |
160 | * after the header. | |
9ab86bbc | 161 | */ |
012873d0 | 162 | char padding[4]; |
9ab86bbc SM |
163 | }; |
164 | ||
986a4f4d JW |
165 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
166 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
167 | */ | |
168 | static int vq2txq(struct virtqueue *vq) | |
169 | { | |
9d0ca6ed | 170 | return (vq->index - 1) / 2; |
986a4f4d JW |
171 | } |
172 | ||
173 | static int txq2vq(int txq) | |
174 | { | |
175 | return txq * 2 + 1; | |
176 | } | |
177 | ||
178 | static int vq2rxq(struct virtqueue *vq) | |
179 | { | |
9d0ca6ed | 180 | return vq->index / 2; |
986a4f4d JW |
181 | } |
182 | ||
183 | static int rxq2vq(int rxq) | |
184 | { | |
185 | return rxq * 2; | |
186 | } | |
187 | ||
012873d0 | 188 | static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 189 | { |
012873d0 | 190 | return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; |
296f96fc RR |
191 | } |
192 | ||
9ab86bbc SM |
193 | /* |
194 | * private is used to chain pages for big packets, put the whole | |
195 | * most recent used list in the beginning for reuse | |
196 | */ | |
e9d7417b | 197 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 198 | { |
9ab86bbc | 199 | struct page *end; |
0a888fd1 | 200 | |
e9d7417b | 201 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 202 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
203 | end->private = (unsigned long)rq->pages; |
204 | rq->pages = page; | |
0a888fd1 MM |
205 | } |
206 | ||
e9d7417b | 207 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 208 | { |
e9d7417b | 209 | struct page *p = rq->pages; |
fb6813f4 | 210 | |
9ab86bbc | 211 | if (p) { |
e9d7417b | 212 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
213 | /* clear private here, it is used to chain pages */ |
214 | p->private = 0; | |
215 | } else | |
fb6813f4 RR |
216 | p = alloc_page(gfp_mask); |
217 | return p; | |
218 | } | |
219 | ||
e9d7417b | 220 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 221 | { |
e9d7417b | 222 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 223 | |
2cb9c6ba | 224 | /* Suppress further interrupts. */ |
e9d7417b | 225 | virtqueue_disable_cb(vq); |
11a3a154 | 226 | |
363f1514 | 227 | /* We were probably waiting for more output buffers. */ |
986a4f4d | 228 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
296f96fc RR |
229 | } |
230 | ||
ab7db917 MD |
231 | static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) |
232 | { | |
233 | unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); | |
234 | return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; | |
235 | } | |
236 | ||
237 | static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) | |
238 | { | |
239 | return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); | |
240 | ||
241 | } | |
242 | ||
243 | static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) | |
244 | { | |
245 | unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; | |
246 | return (unsigned long)buf | (size - 1); | |
247 | } | |
248 | ||
3464645a | 249 | /* Called from bottom half context */ |
946fa564 MT |
250 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
251 | struct receive_queue *rq, | |
2613af0e MD |
252 | struct page *page, unsigned int offset, |
253 | unsigned int len, unsigned int truesize) | |
9ab86bbc SM |
254 | { |
255 | struct sk_buff *skb; | |
012873d0 | 256 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
2613af0e | 257 | unsigned int copy, hdr_len, hdr_padded_len; |
9ab86bbc | 258 | char *p; |
fb6813f4 | 259 | |
2613af0e | 260 | p = page_address(page) + offset; |
3f2c31d9 | 261 | |
9ab86bbc | 262 | /* copy small packet so we can reuse these pages for small data */ |
c67f5db8 | 263 | skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); |
9ab86bbc SM |
264 | if (unlikely(!skb)) |
265 | return NULL; | |
3f2c31d9 | 266 | |
9ab86bbc | 267 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 268 | |
012873d0 MT |
269 | hdr_len = vi->hdr_len; |
270 | if (vi->mergeable_rx_bufs) | |
271 | hdr_padded_len = sizeof *hdr; | |
272 | else | |
2613af0e | 273 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
3f2c31d9 | 274 | |
9ab86bbc | 275 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 276 | |
9ab86bbc | 277 | len -= hdr_len; |
2613af0e MD |
278 | offset += hdr_padded_len; |
279 | p += hdr_padded_len; | |
3f2c31d9 | 280 | |
9ab86bbc SM |
281 | copy = len; |
282 | if (copy > skb_tailroom(skb)) | |
283 | copy = skb_tailroom(skb); | |
284 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 285 | |
9ab86bbc SM |
286 | len -= copy; |
287 | offset += copy; | |
3f2c31d9 | 288 | |
2613af0e MD |
289 | if (vi->mergeable_rx_bufs) { |
290 | if (len) | |
291 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); | |
292 | else | |
293 | put_page(page); | |
294 | return skb; | |
295 | } | |
296 | ||
e878d78b SL |
297 | /* |
298 | * Verify that we can indeed put this data into a skb. | |
299 | * This is here to handle cases when the device erroneously | |
300 | * tries to receive more than is possible. This is usually | |
301 | * the case of a broken device. | |
302 | */ | |
303 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 304 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
305 | dev_kfree_skb(skb); |
306 | return NULL; | |
307 | } | |
2613af0e | 308 | BUG_ON(offset >= PAGE_SIZE); |
9ab86bbc | 309 | while (len) { |
2613af0e MD |
310 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
311 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, | |
312 | frag_size, truesize); | |
313 | len -= frag_size; | |
9ab86bbc SM |
314 | page = (struct page *)page->private; |
315 | offset = 0; | |
316 | } | |
3f2c31d9 | 317 | |
9ab86bbc | 318 | if (page) |
e9d7417b | 319 | give_pages(rq, page); |
3f2c31d9 | 320 | |
9ab86bbc SM |
321 | return skb; |
322 | } | |
3f2c31d9 | 323 | |
012873d0 | 324 | static struct sk_buff *receive_small(struct virtnet_info *vi, void *buf, unsigned int len) |
f121159d MT |
325 | { |
326 | struct sk_buff * skb = buf; | |
327 | ||
012873d0 | 328 | len -= vi->hdr_len; |
f121159d MT |
329 | skb_trim(skb, len); |
330 | ||
331 | return skb; | |
332 | } | |
333 | ||
334 | static struct sk_buff *receive_big(struct net_device *dev, | |
946fa564 | 335 | struct virtnet_info *vi, |
f121159d MT |
336 | struct receive_queue *rq, |
337 | void *buf, | |
338 | unsigned int len) | |
339 | { | |
340 | struct page *page = buf; | |
946fa564 | 341 | struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE); |
f121159d MT |
342 | |
343 | if (unlikely(!skb)) | |
344 | goto err; | |
345 | ||
346 | return skb; | |
347 | ||
348 | err: | |
349 | dev->stats.rx_dropped++; | |
350 | give_pages(rq, page); | |
351 | return NULL; | |
352 | } | |
353 | ||
8fc3b9e9 | 354 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
fdd819b2 | 355 | struct virtnet_info *vi, |
8fc3b9e9 | 356 | struct receive_queue *rq, |
ab7db917 | 357 | unsigned long ctx, |
8fc3b9e9 | 358 | unsigned int len) |
9ab86bbc | 359 | { |
ab7db917 | 360 | void *buf = mergeable_ctx_to_buf_address(ctx); |
012873d0 MT |
361 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; |
362 | u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); | |
8fc3b9e9 MT |
363 | struct page *page = virt_to_head_page(buf); |
364 | int offset = buf - page_address(page); | |
ab7db917 MD |
365 | unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
366 | ||
946fa564 MT |
367 | struct sk_buff *head_skb = page_to_skb(vi, rq, page, offset, len, |
368 | truesize); | |
2613af0e | 369 | struct sk_buff *curr_skb = head_skb; |
9ab86bbc | 370 | |
8fc3b9e9 MT |
371 | if (unlikely(!curr_skb)) |
372 | goto err_skb; | |
9ab86bbc | 373 | while (--num_buf) { |
8fc3b9e9 MT |
374 | int num_skb_frags; |
375 | ||
ab7db917 MD |
376 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
377 | if (unlikely(!ctx)) { | |
8fc3b9e9 | 378 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
fdd819b2 | 379 | dev->name, num_buf, |
012873d0 MT |
380 | virtio16_to_cpu(vi->vdev, |
381 | hdr->num_buffers)); | |
8fc3b9e9 MT |
382 | dev->stats.rx_length_errors++; |
383 | goto err_buf; | |
3f2c31d9 | 384 | } |
8fc3b9e9 | 385 | |
ab7db917 | 386 | buf = mergeable_ctx_to_buf_address(ctx); |
8fc3b9e9 | 387 | page = virt_to_head_page(buf); |
8fc3b9e9 MT |
388 | |
389 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; | |
2613af0e MD |
390 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
391 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
8fc3b9e9 MT |
392 | |
393 | if (unlikely(!nskb)) | |
394 | goto err_skb; | |
2613af0e MD |
395 | if (curr_skb == head_skb) |
396 | skb_shinfo(curr_skb)->frag_list = nskb; | |
397 | else | |
398 | curr_skb->next = nskb; | |
399 | curr_skb = nskb; | |
400 | head_skb->truesize += nskb->truesize; | |
401 | num_skb_frags = 0; | |
402 | } | |
ab7db917 | 403 | truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
2613af0e MD |
404 | if (curr_skb != head_skb) { |
405 | head_skb->data_len += len; | |
406 | head_skb->len += len; | |
fb51879d | 407 | head_skb->truesize += truesize; |
2613af0e | 408 | } |
8fc3b9e9 | 409 | offset = buf - page_address(page); |
ba275241 JW |
410 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
411 | put_page(page); | |
412 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
fb51879d | 413 | len, truesize); |
ba275241 JW |
414 | } else { |
415 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
fb51879d | 416 | offset, len, truesize); |
ba275241 | 417 | } |
8fc3b9e9 MT |
418 | } |
419 | ||
5377d758 | 420 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); |
8fc3b9e9 MT |
421 | return head_skb; |
422 | ||
423 | err_skb: | |
424 | put_page(page); | |
425 | while (--num_buf) { | |
ab7db917 MD |
426 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
427 | if (unlikely(!ctx)) { | |
8fc3b9e9 MT |
428 | pr_debug("%s: rx error: %d buffers missing\n", |
429 | dev->name, num_buf); | |
430 | dev->stats.rx_length_errors++; | |
431 | break; | |
432 | } | |
ab7db917 | 433 | page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); |
8fc3b9e9 | 434 | put_page(page); |
9ab86bbc | 435 | } |
8fc3b9e9 MT |
436 | err_buf: |
437 | dev->stats.rx_dropped++; | |
438 | dev_kfree_skb(head_skb); | |
439 | return NULL; | |
9ab86bbc SM |
440 | } |
441 | ||
946fa564 MT |
442 | static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
443 | void *buf, unsigned int len) | |
9ab86bbc | 444 | { |
e9d7417b | 445 | struct net_device *dev = vi->dev; |
58472a76 | 446 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc | 447 | struct sk_buff *skb; |
012873d0 | 448 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
3f2c31d9 | 449 | |
bcff3162 | 450 | if (unlikely(len < vi->hdr_len + ETH_HLEN)) { |
9ab86bbc SM |
451 | pr_debug("%s: short packet %i\n", dev->name, len); |
452 | dev->stats.rx_length_errors++; | |
ab7db917 MD |
453 | if (vi->mergeable_rx_bufs) { |
454 | unsigned long ctx = (unsigned long)buf; | |
455 | void *base = mergeable_ctx_to_buf_address(ctx); | |
456 | put_page(virt_to_head_page(base)); | |
457 | } else if (vi->big_packets) { | |
98bfd23c | 458 | give_pages(rq, buf); |
ab7db917 | 459 | } else { |
9ab86bbc | 460 | dev_kfree_skb(buf); |
ab7db917 | 461 | } |
9ab86bbc SM |
462 | return; |
463 | } | |
3f2c31d9 | 464 | |
f121159d | 465 | if (vi->mergeable_rx_bufs) |
fdd819b2 | 466 | skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len); |
f121159d | 467 | else if (vi->big_packets) |
946fa564 | 468 | skb = receive_big(dev, vi, rq, buf, len); |
f121159d | 469 | else |
012873d0 | 470 | skb = receive_small(vi, buf, len); |
f121159d MT |
471 | |
472 | if (unlikely(!skb)) | |
473 | return; | |
3f2c31d9 | 474 | |
9ab86bbc | 475 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 476 | |
83a27052 | 477 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 478 | stats->rx_bytes += skb->len; |
479 | stats->rx_packets++; | |
83a27052 | 480 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 481 | |
b3f24698 | 482 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 483 | pr_debug("Needs csum!\n"); |
b3f24698 | 484 | if (!skb_partial_csum_set(skb, |
fdd819b2 MT |
485 | virtio16_to_cpu(vi->vdev, hdr->hdr.csum_start), |
486 | virtio16_to_cpu(vi->vdev, hdr->hdr.csum_offset))) | |
296f96fc | 487 | goto frame_err; |
10a8d94a JW |
488 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
489 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
490 | } |
491 | ||
23cde76d MM |
492 | skb->protocol = eth_type_trans(skb, dev); |
493 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
494 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
495 | ||
b3f24698 | 496 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 497 | pr_debug("GSO!\n"); |
b3f24698 | 498 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc | 499 | case VIRTIO_NET_HDR_GSO_TCPV4: |
c9af6db4 | 500 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
296f96fc | 501 | break; |
296f96fc | 502 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 503 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
296f96fc RR |
504 | break; |
505 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 506 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
296f96fc RR |
507 | break; |
508 | default: | |
be443899 AW |
509 | net_warn_ratelimited("%s: bad gso type %u.\n", |
510 | dev->name, hdr->hdr.gso_type); | |
296f96fc RR |
511 | goto frame_err; |
512 | } | |
513 | ||
b3f24698 | 514 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
c9af6db4 | 515 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
34a48579 | 516 | |
fdd819b2 MT |
517 | skb_shinfo(skb)->gso_size = virtio16_to_cpu(vi->vdev, |
518 | hdr->hdr.gso_size); | |
296f96fc | 519 | if (skb_shinfo(skb)->gso_size == 0) { |
be443899 | 520 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
296f96fc RR |
521 | goto frame_err; |
522 | } | |
523 | ||
524 | /* Header must be checked, and gso_segs computed. */ | |
525 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
526 | skb_shinfo(skb)->gso_segs = 0; | |
527 | } | |
528 | ||
0fbd050a | 529 | napi_gro_receive(&rq->napi, skb); |
296f96fc RR |
530 | return; |
531 | ||
532 | frame_err: | |
533 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
534 | dev_kfree_skb(skb); |
535 | } | |
536 | ||
946fa564 MT |
537 | static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
538 | gfp_t gfp) | |
296f96fc RR |
539 | { |
540 | struct sk_buff *skb; | |
012873d0 | 541 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
9ab86bbc | 542 | int err; |
3f2c31d9 | 543 | |
5061de36 | 544 | skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp); |
9ab86bbc SM |
545 | if (unlikely(!skb)) |
546 | return -ENOMEM; | |
296f96fc | 547 | |
5061de36 | 548 | skb_put(skb, GOOD_PACKET_LEN); |
3f2c31d9 | 549 | |
9ab86bbc | 550 | hdr = skb_vnet_hdr(skb); |
547c890c | 551 | sg_init_table(rq->sg, 2); |
012873d0 | 552 | sg_set_buf(rq->sg, hdr, vi->hdr_len); |
e9d7417b | 553 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
97402b96 | 554 | |
9dc7b9e4 | 555 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp); |
9ab86bbc SM |
556 | if (err < 0) |
557 | dev_kfree_skb(skb); | |
97402b96 | 558 | |
9ab86bbc SM |
559 | return err; |
560 | } | |
97402b96 | 561 | |
012873d0 MT |
562 | static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, |
563 | gfp_t gfp) | |
9ab86bbc | 564 | { |
9ab86bbc SM |
565 | struct page *first, *list = NULL; |
566 | char *p; | |
567 | int i, err, offset; | |
568 | ||
a5835440 RR |
569 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
570 | ||
e9d7417b | 571 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 572 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 573 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
574 | if (!first) { |
575 | if (list) | |
e9d7417b | 576 | give_pages(rq, list); |
9ab86bbc | 577 | return -ENOMEM; |
97402b96 | 578 | } |
e9d7417b | 579 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 580 | |
9ab86bbc SM |
581 | /* chain new page in list head to match sg */ |
582 | first->private = (unsigned long)list; | |
583 | list = first; | |
584 | } | |
296f96fc | 585 | |
e9d7417b | 586 | first = get_a_page(rq, gfp); |
9ab86bbc | 587 | if (!first) { |
e9d7417b | 588 | give_pages(rq, list); |
9ab86bbc SM |
589 | return -ENOMEM; |
590 | } | |
591 | p = page_address(first); | |
592 | ||
e9d7417b | 593 | /* rq->sg[0], rq->sg[1] share the same page */ |
012873d0 MT |
594 | /* a separated rq->sg[0] for header - required in case !any_header_sg */ |
595 | sg_set_buf(&rq->sg[0], p, vi->hdr_len); | |
9ab86bbc | 596 | |
e9d7417b | 597 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 598 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 599 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
600 | |
601 | /* chain first in list head */ | |
602 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
603 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
604 | first, gfp); | |
9ab86bbc | 605 | if (err < 0) |
e9d7417b | 606 | give_pages(rq, first); |
9ab86bbc SM |
607 | |
608 | return err; | |
296f96fc RR |
609 | } |
610 | ||
5377d758 | 611 | static unsigned int get_mergeable_buf_len(struct ewma_pkt_len *avg_pkt_len) |
3f2c31d9 | 612 | { |
ab7db917 | 613 | const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
fbf28d78 MD |
614 | unsigned int len; |
615 | ||
5377d758 | 616 | len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), |
fbf28d78 MD |
617 | GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); |
618 | return ALIGN(len, MERGEABLE_BUFFER_ALIGN); | |
619 | } | |
620 | ||
621 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) | |
622 | { | |
fb51879d MD |
623 | struct page_frag *alloc_frag = &rq->alloc_frag; |
624 | char *buf; | |
ab7db917 | 625 | unsigned long ctx; |
3f2c31d9 | 626 | int err; |
fb51879d | 627 | unsigned int len, hole; |
3f2c31d9 | 628 | |
fbf28d78 | 629 | len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); |
ab7db917 | 630 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) |
9ab86bbc | 631 | return -ENOMEM; |
ab7db917 | 632 | |
fb51879d | 633 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
ab7db917 | 634 | ctx = mergeable_buf_to_ctx(buf, len); |
fb51879d | 635 | get_page(alloc_frag->page); |
fb51879d MD |
636 | alloc_frag->offset += len; |
637 | hole = alloc_frag->size - alloc_frag->offset; | |
ab7db917 MD |
638 | if (hole < len) { |
639 | /* To avoid internal fragmentation, if there is very likely not | |
640 | * enough space for another buffer, add the remaining space to | |
641 | * the current buffer. This extra space is not included in | |
642 | * the truesize stored in ctx. | |
643 | */ | |
fb51879d MD |
644 | len += hole; |
645 | alloc_frag->offset += hole; | |
646 | } | |
3f2c31d9 | 647 | |
fb51879d | 648 | sg_init_one(rq->sg, buf, len); |
ab7db917 | 649 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); |
9ab86bbc | 650 | if (err < 0) |
2613af0e | 651 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 652 | |
9ab86bbc SM |
653 | return err; |
654 | } | |
3f2c31d9 | 655 | |
b2baed69 RR |
656 | /* |
657 | * Returns false if we couldn't fill entirely (OOM). | |
658 | * | |
659 | * Normally run in the receive path, but can also be run from ndo_open | |
660 | * before we're receiving packets, or from refill_work which is | |
661 | * careful to disable receiving (using napi_disable). | |
662 | */ | |
946fa564 MT |
663 | static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, |
664 | gfp_t gfp) | |
9ab86bbc SM |
665 | { |
666 | int err; | |
1788f495 | 667 | bool oom; |
3f2c31d9 | 668 | |
fb51879d | 669 | gfp |= __GFP_COLD; |
9ab86bbc SM |
670 | do { |
671 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 672 | err = add_recvbuf_mergeable(rq, gfp); |
9ab86bbc | 673 | else if (vi->big_packets) |
012873d0 | 674 | err = add_recvbuf_big(vi, rq, gfp); |
9ab86bbc | 675 | else |
946fa564 | 676 | err = add_recvbuf_small(vi, rq, gfp); |
3f2c31d9 | 677 | |
1788f495 | 678 | oom = err == -ENOMEM; |
9ed4cb07 | 679 | if (err) |
3f2c31d9 | 680 | break; |
b7dfde95 | 681 | } while (rq->vq->num_free); |
681daee2 | 682 | virtqueue_kick(rq->vq); |
3161e453 | 683 | return !oom; |
3f2c31d9 MM |
684 | } |
685 | ||
18445c4d | 686 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
687 | { |
688 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 689 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 690 | |
18445c4d | 691 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 692 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 693 | virtqueue_disable_cb(rvq); |
e9d7417b | 694 | __napi_schedule(&rq->napi); |
18445c4d | 695 | } |
296f96fc RR |
696 | } |
697 | ||
e9d7417b | 698 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 699 | { |
e9d7417b | 700 | napi_enable(&rq->napi); |
3e9d08ec BR |
701 | |
702 | /* If all buffers were filled by other side before we napi_enabled, we | |
703 | * won't get another interrupt, so process any outstanding packets | |
704 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
705 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
706 | if (napi_schedule_prep(&rq->napi)) { |
707 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 708 | local_bh_disable(); |
e9d7417b | 709 | __napi_schedule(&rq->napi); |
ec13ee80 | 710 | local_bh_enable(); |
3e9d08ec BR |
711 | } |
712 | } | |
713 | ||
3161e453 RR |
714 | static void refill_work(struct work_struct *work) |
715 | { | |
e9d7417b JW |
716 | struct virtnet_info *vi = |
717 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 718 | bool still_empty; |
986a4f4d JW |
719 | int i; |
720 | ||
55257d72 | 721 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 722 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 723 | |
986a4f4d | 724 | napi_disable(&rq->napi); |
946fa564 | 725 | still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); |
986a4f4d | 726 | virtnet_napi_enable(rq); |
3161e453 | 727 | |
986a4f4d JW |
728 | /* In theory, this can happen: if we don't get any buffers in |
729 | * we will *never* try to fill again. | |
730 | */ | |
731 | if (still_empty) | |
732 | schedule_delayed_work(&vi->refill, HZ/2); | |
733 | } | |
3161e453 RR |
734 | } |
735 | ||
2ffa7598 | 736 | static int virtnet_receive(struct receive_queue *rq, int budget) |
296f96fc | 737 | { |
e9d7417b | 738 | struct virtnet_info *vi = rq->vq->vdev->priv; |
2ffa7598 | 739 | unsigned int len, received = 0; |
9ab86bbc | 740 | void *buf; |
296f96fc | 741 | |
296f96fc | 742 | while (received < budget && |
e9d7417b | 743 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
946fa564 | 744 | receive_buf(vi, rq, buf, len); |
296f96fc RR |
745 | received++; |
746 | } | |
747 | ||
be121f46 | 748 | if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { |
946fa564 | 749 | if (!try_fill_recv(vi, rq, GFP_ATOMIC)) |
3b07e9ca | 750 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 751 | } |
296f96fc | 752 | |
2ffa7598 JW |
753 | return received; |
754 | } | |
755 | ||
756 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
757 | { | |
758 | struct receive_queue *rq = | |
759 | container_of(napi, struct receive_queue, napi); | |
faadb05f | 760 | unsigned int r, received; |
2ffa7598 | 761 | |
faadb05f | 762 | received = virtnet_receive(rq, budget); |
2ffa7598 | 763 | |
8329d98e RR |
764 | /* Out of packets? */ |
765 | if (received < budget) { | |
cbdadbbf | 766 | r = virtqueue_enable_cb_prepare(rq->vq); |
0fbd050a | 767 | napi_complete_done(napi, received); |
cbdadbbf | 768 | if (unlikely(virtqueue_poll(rq->vq, r)) && |
8e95a202 | 769 | napi_schedule_prep(napi)) { |
e9d7417b | 770 | virtqueue_disable_cb(rq->vq); |
288379f0 | 771 | __napi_schedule(napi); |
4265f161 | 772 | } |
296f96fc RR |
773 | } |
774 | ||
775 | return received; | |
776 | } | |
777 | ||
91815639 JW |
778 | #ifdef CONFIG_NET_RX_BUSY_POLL |
779 | /* must be called with local_bh_disable()d */ | |
780 | static int virtnet_busy_poll(struct napi_struct *napi) | |
781 | { | |
782 | struct receive_queue *rq = | |
783 | container_of(napi, struct receive_queue, napi); | |
784 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
785 | int r, received = 0, budget = 4; | |
786 | ||
787 | if (!(vi->status & VIRTIO_NET_S_LINK_UP)) | |
788 | return LL_FLUSH_FAILED; | |
789 | ||
790 | if (!napi_schedule_prep(napi)) | |
791 | return LL_FLUSH_BUSY; | |
792 | ||
793 | virtqueue_disable_cb(rq->vq); | |
794 | ||
795 | again: | |
796 | received += virtnet_receive(rq, budget); | |
797 | ||
798 | r = virtqueue_enable_cb_prepare(rq->vq); | |
799 | clear_bit(NAPI_STATE_SCHED, &napi->state); | |
800 | if (unlikely(virtqueue_poll(rq->vq, r)) && | |
801 | napi_schedule_prep(napi)) { | |
802 | virtqueue_disable_cb(rq->vq); | |
803 | if (received < budget) { | |
804 | budget -= received; | |
805 | goto again; | |
806 | } else { | |
807 | __napi_schedule(napi); | |
808 | } | |
809 | } | |
810 | ||
811 | return received; | |
812 | } | |
813 | #endif /* CONFIG_NET_RX_BUSY_POLL */ | |
814 | ||
986a4f4d JW |
815 | static int virtnet_open(struct net_device *dev) |
816 | { | |
817 | struct virtnet_info *vi = netdev_priv(dev); | |
818 | int i; | |
819 | ||
e4166625 JW |
820 | for (i = 0; i < vi->max_queue_pairs; i++) { |
821 | if (i < vi->curr_queue_pairs) | |
822 | /* Make sure we have some buffers: if oom use wq. */ | |
946fa564 | 823 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
e4166625 | 824 | schedule_delayed_work(&vi->refill, 0); |
986a4f4d JW |
825 | virtnet_napi_enable(&vi->rq[i]); |
826 | } | |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
b7dfde95 | 831 | static void free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
832 | { |
833 | struct sk_buff *skb; | |
6ee57bcc | 834 | unsigned int len; |
e9d7417b | 835 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 836 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 837 | |
e9d7417b | 838 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 839 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 840 | |
83a27052 | 841 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 842 | stats->tx_bytes += skb->len; |
843 | stats->tx_packets++; | |
83a27052 | 844 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 845 | |
ed79bab8 | 846 | dev_kfree_skb_any(skb); |
296f96fc RR |
847 | } |
848 | } | |
849 | ||
e9d7417b | 850 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 851 | { |
012873d0 | 852 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
296f96fc | 853 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 854 | struct virtnet_info *vi = sq->vq->vdev->priv; |
7bedc7dc | 855 | unsigned num_sg; |
012873d0 | 856 | unsigned hdr_len = vi->hdr_len; |
e7428e95 | 857 | bool can_push; |
296f96fc | 858 | |
e174961c | 859 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
860 | |
861 | can_push = vi->any_header_sg && | |
862 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
863 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
864 | /* Even if we can, don't push here yet as this would skew | |
865 | * csum_start offset below. */ | |
866 | if (can_push) | |
012873d0 | 867 | hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); |
e7428e95 MT |
868 | else |
869 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 870 | |
296f96fc | 871 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 872 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
fdd819b2 MT |
873 | hdr->hdr.csum_start = cpu_to_virtio16(vi->vdev, |
874 | skb_checksum_start_offset(skb)); | |
875 | hdr->hdr.csum_offset = cpu_to_virtio16(vi->vdev, | |
876 | skb->csum_offset); | |
296f96fc | 877 | } else { |
b3f24698 RR |
878 | hdr->hdr.flags = 0; |
879 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
880 | } |
881 | ||
882 | if (skb_is_gso(skb)) { | |
fdd819b2 MT |
883 | hdr->hdr.hdr_len = cpu_to_virtio16(vi->vdev, skb_headlen(skb)); |
884 | hdr->hdr.gso_size = cpu_to_virtio16(vi->vdev, | |
885 | skb_shinfo(skb)->gso_size); | |
34a48579 | 886 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 887 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 888 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 889 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
e3e3c423 VY |
890 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
891 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
296f96fc RR |
892 | else |
893 | BUG(); | |
34a48579 | 894 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 895 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 896 | } else { |
b3f24698 RR |
897 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
898 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
899 | } |
900 | ||
3f2c31d9 | 901 | if (vi->mergeable_rx_bufs) |
012873d0 | 902 | hdr->num_buffers = 0; |
3f2c31d9 | 903 | |
547c890c | 904 | sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); |
e7428e95 MT |
905 | if (can_push) { |
906 | __skb_push(skb, hdr_len); | |
907 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
908 | /* Pull header back to avoid skew in tx bytes calculations. */ | |
909 | __skb_pull(skb, hdr_len); | |
910 | } else { | |
911 | sg_set_buf(sq->sg, hdr, hdr_len); | |
912 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; | |
913 | } | |
9dc7b9e4 | 914 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
915 | } |
916 | ||
424efe9c | 917 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
918 | { |
919 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
920 | int qnum = skb_get_queue_mapping(skb); |
921 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 922 | int err; |
4b7fd2e6 MT |
923 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
924 | bool kick = !skb->xmit_more; | |
2cb9c6ba | 925 | |
2cb9c6ba | 926 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 927 | free_old_xmit_skbs(sq); |
99ffc696 | 928 | |
074c3582 JK |
929 | /* timestamp packet in software */ |
930 | skb_tx_timestamp(skb); | |
931 | ||
03f191ba | 932 | /* Try to transmit */ |
b7dfde95 | 933 | err = xmit_skb(sq, skb); |
48925e37 | 934 | |
9ed4cb07 | 935 | /* This should not happen! */ |
681daee2 | 936 | if (unlikely(err)) { |
9ed4cb07 RR |
937 | dev->stats.tx_fifo_errors++; |
938 | if (net_ratelimit()) | |
939 | dev_warn(&dev->dev, | |
b7dfde95 | 940 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d | 941 | dev->stats.tx_dropped++; |
85e94525 | 942 | dev_kfree_skb_any(skb); |
58eba97d | 943 | return NETDEV_TX_OK; |
296f96fc | 944 | } |
03f191ba | 945 | |
48925e37 RR |
946 | /* Don't wait up for transmitted skbs to be freed. */ |
947 | skb_orphan(skb); | |
948 | nf_reset(skb); | |
949 | ||
60302ff6 MT |
950 | /* If running out of space, stop queue to avoid getting packets that we |
951 | * are then unable to transmit. | |
952 | * An alternative would be to force queuing layer to requeue the skb by | |
953 | * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be | |
954 | * returned in a normal path of operation: it means that driver is not | |
955 | * maintaining the TX queue stop/start state properly, and causes | |
956 | * the stack to do a non-trivial amount of useless work. | |
957 | * Since most packets only take 1 or 2 ring slots, stopping the queue | |
958 | * early means 16 slots are typically wasted. | |
d631b94e | 959 | */ |
b7dfde95 | 960 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 961 | netif_stop_subqueue(dev, qnum); |
e9d7417b | 962 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 963 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
964 | free_old_xmit_skbs(sq); |
965 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 966 | netif_start_subqueue(dev, qnum); |
e9d7417b | 967 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
968 | } |
969 | } | |
99ffc696 | 970 | } |
48925e37 | 971 | |
4b7fd2e6 | 972 | if (kick || netif_xmit_stopped(txq)) |
0b725a2c | 973 | virtqueue_kick(sq->vq); |
296f96fc | 974 | |
0b725a2c | 975 | return NETDEV_TX_OK; |
c223a078 DM |
976 | } |
977 | ||
40cbfc37 AK |
978 | /* |
979 | * Send command via the control virtqueue and check status. Commands | |
980 | * supported by the hypervisor, as indicated by feature bits, should | |
788a8b6d | 981 | * never fail unless improperly formatted. |
40cbfc37 AK |
982 | */ |
983 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
d24bae32 | 984 | struct scatterlist *out) |
40cbfc37 | 985 | { |
f7bc9594 | 986 | struct scatterlist *sgs[4], hdr, stat; |
d24bae32 | 987 | unsigned out_num = 0, tmp; |
40cbfc37 AK |
988 | |
989 | /* Caller should know better */ | |
f7bc9594 | 990 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 | 991 | |
2ac46030 MT |
992 | vi->ctrl_status = ~0; |
993 | vi->ctrl_hdr.class = class; | |
994 | vi->ctrl_hdr.cmd = cmd; | |
f7bc9594 | 995 | /* Add header */ |
2ac46030 | 996 | sg_init_one(&hdr, &vi->ctrl_hdr, sizeof(vi->ctrl_hdr)); |
f7bc9594 | 997 | sgs[out_num++] = &hdr; |
40cbfc37 | 998 | |
f7bc9594 RR |
999 | if (out) |
1000 | sgs[out_num++] = out; | |
40cbfc37 | 1001 | |
f7bc9594 | 1002 | /* Add return status. */ |
2ac46030 | 1003 | sg_init_one(&stat, &vi->ctrl_status, sizeof(vi->ctrl_status)); |
d24bae32 | 1004 | sgs[out_num] = &stat; |
40cbfc37 | 1005 | |
d24bae32 | 1006 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
a7c58146 | 1007 | virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
40cbfc37 | 1008 | |
67975901 | 1009 | if (unlikely(!virtqueue_kick(vi->cvq))) |
2ac46030 | 1010 | return vi->ctrl_status == VIRTIO_NET_OK; |
40cbfc37 AK |
1011 | |
1012 | /* Spin for a response, the kick causes an ioport write, trapping | |
1013 | * into the hypervisor, so the request should be handled immediately. | |
1014 | */ | |
047b9b94 HG |
1015 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
1016 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
1017 | cpu_relax(); |
1018 | ||
2ac46030 | 1019 | return vi->ctrl_status == VIRTIO_NET_OK; |
40cbfc37 AK |
1020 | } |
1021 | ||
9c46f6d4 AW |
1022 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
1023 | { | |
1024 | struct virtnet_info *vi = netdev_priv(dev); | |
1025 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 1026 | int ret; |
7e58d5ae AK |
1027 | struct sockaddr *addr = p; |
1028 | struct scatterlist sg; | |
9c46f6d4 | 1029 | |
7e58d5ae | 1030 | ret = eth_prepare_mac_addr_change(dev, p); |
f2f2c8b4 JP |
1031 | if (ret) |
1032 | return ret; | |
9c46f6d4 | 1033 | |
7e58d5ae AK |
1034 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
1035 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
1036 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1037 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
7e58d5ae AK |
1038 | dev_warn(&vdev->dev, |
1039 | "Failed to set mac address by vq command.\n"); | |
1040 | return -EINVAL; | |
1041 | } | |
7e93a02f MT |
1042 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && |
1043 | !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
855e0c52 RR |
1044 | unsigned int i; |
1045 | ||
1046 | /* Naturally, this has an atomicity problem. */ | |
1047 | for (i = 0; i < dev->addr_len; i++) | |
1048 | virtio_cwrite8(vdev, | |
1049 | offsetof(struct virtio_net_config, mac) + | |
1050 | i, addr->sa_data[i]); | |
7e58d5ae AK |
1051 | } |
1052 | ||
1053 | eth_commit_mac_addr_change(dev, p); | |
9c46f6d4 AW |
1054 | |
1055 | return 0; | |
1056 | } | |
1057 | ||
3fa2a1df | 1058 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
1059 | struct rtnl_link_stats64 *tot) | |
1060 | { | |
1061 | struct virtnet_info *vi = netdev_priv(dev); | |
1062 | int cpu; | |
1063 | unsigned int start; | |
1064 | ||
1065 | for_each_possible_cpu(cpu) { | |
58472a76 | 1066 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 1067 | u64 tpackets, tbytes, rpackets, rbytes; |
1068 | ||
1069 | do { | |
57a7744e | 1070 | start = u64_stats_fetch_begin_irq(&stats->tx_syncp); |
3fa2a1df | 1071 | tpackets = stats->tx_packets; |
1072 | tbytes = stats->tx_bytes; | |
57a7744e | 1073 | } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); |
83a27052 ED |
1074 | |
1075 | do { | |
57a7744e | 1076 | start = u64_stats_fetch_begin_irq(&stats->rx_syncp); |
3fa2a1df | 1077 | rpackets = stats->rx_packets; |
1078 | rbytes = stats->rx_bytes; | |
57a7744e | 1079 | } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); |
3fa2a1df | 1080 | |
1081 | tot->rx_packets += rpackets; | |
1082 | tot->tx_packets += tpackets; | |
1083 | tot->rx_bytes += rbytes; | |
1084 | tot->tx_bytes += tbytes; | |
1085 | } | |
1086 | ||
1087 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 1088 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 1089 | tot->rx_dropped = dev->stats.rx_dropped; |
1090 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
1091 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
1092 | ||
1093 | return tot; | |
1094 | } | |
1095 | ||
da74e89d AS |
1096 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1097 | static void virtnet_netpoll(struct net_device *dev) | |
1098 | { | |
1099 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1100 | int i; |
da74e89d | 1101 | |
986a4f4d JW |
1102 | for (i = 0; i < vi->curr_queue_pairs; i++) |
1103 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
1104 | } |
1105 | #endif | |
1106 | ||
586d17c5 JW |
1107 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
1108 | { | |
1109 | rtnl_lock(); | |
1110 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
d24bae32 | 1111 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
586d17c5 JW |
1112 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
1113 | rtnl_unlock(); | |
1114 | } | |
1115 | ||
986a4f4d JW |
1116 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
1117 | { | |
1118 | struct scatterlist sg; | |
1119 | struct virtio_net_ctrl_mq s; | |
1120 | struct net_device *dev = vi->dev; | |
1121 | ||
1122 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
1123 | return 0; | |
1124 | ||
fdd819b2 | 1125 | s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
986a4f4d JW |
1126 | sg_init_one(&sg, &s, sizeof(s)); |
1127 | ||
1128 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
d24bae32 | 1129 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
986a4f4d JW |
1130 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
1131 | queue_pairs); | |
1132 | return -EINVAL; | |
55257d72 | 1133 | } else { |
986a4f4d | 1134 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
1135 | /* virtnet_open() will refill when device is going to up. */ |
1136 | if (dev->flags & IFF_UP) | |
1137 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 1138 | } |
986a4f4d JW |
1139 | |
1140 | return 0; | |
1141 | } | |
1142 | ||
296f96fc RR |
1143 | static int virtnet_close(struct net_device *dev) |
1144 | { | |
1145 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1146 | int i; |
296f96fc | 1147 | |
b2baed69 RR |
1148 | /* Make sure refill_work doesn't re-enable napi! */ |
1149 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d JW |
1150 | |
1151 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1152 | napi_disable(&vi->rq[i].napi); | |
296f96fc | 1153 | |
296f96fc RR |
1154 | return 0; |
1155 | } | |
1156 | ||
2af7698e AW |
1157 | static void virtnet_set_rx_mode(struct net_device *dev) |
1158 | { | |
1159 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 1160 | struct scatterlist sg[2]; |
f565a7c2 | 1161 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 1162 | struct netdev_hw_addr *ha; |
32e7bfc4 | 1163 | int uc_count; |
4cd24eaf | 1164 | int mc_count; |
f565a7c2 AW |
1165 | void *buf; |
1166 | int i; | |
2af7698e | 1167 | |
788a8b6d | 1168 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
2af7698e AW |
1169 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
1170 | return; | |
1171 | ||
2ac46030 MT |
1172 | vi->ctrl_promisc = ((dev->flags & IFF_PROMISC) != 0); |
1173 | vi->ctrl_allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1174 | |
2ac46030 | 1175 | sg_init_one(sg, &vi->ctrl_promisc, sizeof(vi->ctrl_promisc)); |
2af7698e AW |
1176 | |
1177 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1178 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
2af7698e | 1179 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
2ac46030 | 1180 | vi->ctrl_promisc ? "en" : "dis"); |
2af7698e | 1181 | |
2ac46030 | 1182 | sg_init_one(sg, &vi->ctrl_allmulti, sizeof(vi->ctrl_allmulti)); |
2af7698e AW |
1183 | |
1184 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1185 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
2af7698e | 1186 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
2ac46030 | 1187 | vi->ctrl_allmulti ? "en" : "dis"); |
f565a7c2 | 1188 | |
32e7bfc4 | 1189 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1190 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1191 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1192 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1193 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1194 | mac_data = buf; | |
e68ed8f0 | 1195 | if (!buf) |
f565a7c2 | 1196 | return; |
f565a7c2 | 1197 | |
23e258e1 AW |
1198 | sg_init_table(sg, 2); |
1199 | ||
f565a7c2 | 1200 | /* Store the unicast list and count in the front of the buffer */ |
fdd819b2 | 1201 | mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); |
ccffad25 | 1202 | i = 0; |
32e7bfc4 | 1203 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1204 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1205 | |
1206 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1207 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1208 | |
1209 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1210 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1211 | |
fdd819b2 | 1212 | mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); |
567ec874 | 1213 | i = 0; |
22bedad3 JP |
1214 | netdev_for_each_mc_addr(ha, dev) |
1215 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1216 | |
1217 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1218 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1219 | |
1220 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1221 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
99e872ae | 1222 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
f565a7c2 AW |
1223 | |
1224 | kfree(buf); | |
2af7698e AW |
1225 | } |
1226 | ||
80d5c368 PM |
1227 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
1228 | __be16 proto, u16 vid) | |
0bde9569 AW |
1229 | { |
1230 | struct virtnet_info *vi = netdev_priv(dev); | |
1231 | struct scatterlist sg; | |
1232 | ||
23e258e1 | 1233 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1234 | |
1235 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1236 | VIRTIO_NET_CTRL_VLAN_ADD, &sg)) |
0bde9569 | 1237 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1238 | return 0; |
0bde9569 AW |
1239 | } |
1240 | ||
80d5c368 PM |
1241 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1242 | __be16 proto, u16 vid) | |
0bde9569 AW |
1243 | { |
1244 | struct virtnet_info *vi = netdev_priv(dev); | |
1245 | struct scatterlist sg; | |
1246 | ||
23e258e1 | 1247 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1248 | |
1249 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1250 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
0bde9569 | 1251 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1252 | return 0; |
0bde9569 AW |
1253 | } |
1254 | ||
8898c21c | 1255 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
986a4f4d JW |
1256 | { |
1257 | int i; | |
1258 | ||
8898c21c WG |
1259 | if (vi->affinity_hint_set) { |
1260 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
47be2479 WG |
1261 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
1262 | virtqueue_set_affinity(vi->sq[i].vq, -1); | |
1263 | } | |
1264 | ||
8898c21c WG |
1265 | vi->affinity_hint_set = false; |
1266 | } | |
8898c21c | 1267 | } |
47be2479 | 1268 | |
8898c21c WG |
1269 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1270 | { | |
1271 | int i; | |
1272 | int cpu; | |
986a4f4d JW |
1273 | |
1274 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1275 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1276 | * setting the affinity hint to eliminate the contention. | |
1277 | */ | |
8898c21c WG |
1278 | if (vi->curr_queue_pairs == 1 || |
1279 | vi->max_queue_pairs != num_online_cpus()) { | |
1280 | virtnet_clean_affinity(vi, -1); | |
1281 | return; | |
986a4f4d JW |
1282 | } |
1283 | ||
8898c21c WG |
1284 | i = 0; |
1285 | for_each_online_cpu(cpu) { | |
986a4f4d JW |
1286 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
1287 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
9bb8ca86 | 1288 | netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); |
8898c21c | 1289 | i++; |
986a4f4d JW |
1290 | } |
1291 | ||
8898c21c | 1292 | vi->affinity_hint_set = true; |
986a4f4d JW |
1293 | } |
1294 | ||
8de4b2f3 WG |
1295 | static int virtnet_cpu_callback(struct notifier_block *nfb, |
1296 | unsigned long action, void *hcpu) | |
1297 | { | |
1298 | struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); | |
1299 | ||
1300 | switch(action & ~CPU_TASKS_FROZEN) { | |
1301 | case CPU_ONLINE: | |
1302 | case CPU_DOWN_FAILED: | |
1303 | case CPU_DEAD: | |
1304 | virtnet_set_affinity(vi); | |
1305 | break; | |
1306 | case CPU_DOWN_PREPARE: | |
1307 | virtnet_clean_affinity(vi, (long)hcpu); | |
1308 | break; | |
1309 | default: | |
1310 | break; | |
1311 | } | |
3ab098df | 1312 | |
8de4b2f3 | 1313 | return NOTIFY_OK; |
986a4f4d JW |
1314 | } |
1315 | ||
8f9f4668 RJ |
1316 | static void virtnet_get_ringparam(struct net_device *dev, |
1317 | struct ethtool_ringparam *ring) | |
1318 | { | |
1319 | struct virtnet_info *vi = netdev_priv(dev); | |
1320 | ||
986a4f4d JW |
1321 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1322 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1323 | ring->rx_pending = ring->rx_max_pending; |
1324 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1325 | } |
1326 | ||
66846048 RJ |
1327 | |
1328 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1329 | struct ethtool_drvinfo *info) | |
1330 | { | |
1331 | struct virtnet_info *vi = netdev_priv(dev); | |
1332 | struct virtio_device *vdev = vi->vdev; | |
1333 | ||
1334 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1335 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1336 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1337 | ||
1338 | } | |
1339 | ||
d73bcd2c JW |
1340 | /* TODO: Eliminate OOO packets during switching */ |
1341 | static int virtnet_set_channels(struct net_device *dev, | |
1342 | struct ethtool_channels *channels) | |
1343 | { | |
1344 | struct virtnet_info *vi = netdev_priv(dev); | |
1345 | u16 queue_pairs = channels->combined_count; | |
1346 | int err; | |
1347 | ||
1348 | /* We don't support separate rx/tx channels. | |
1349 | * We don't allow setting 'other' channels. | |
1350 | */ | |
1351 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1352 | return -EINVAL; | |
1353 | ||
c18e9cd6 | 1354 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
d73bcd2c JW |
1355 | return -EINVAL; |
1356 | ||
47be2479 | 1357 | get_online_cpus(); |
d73bcd2c JW |
1358 | err = virtnet_set_queues(vi, queue_pairs); |
1359 | if (!err) { | |
1360 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1361 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1362 | ||
8898c21c | 1363 | virtnet_set_affinity(vi); |
d73bcd2c | 1364 | } |
47be2479 | 1365 | put_online_cpus(); |
d73bcd2c JW |
1366 | |
1367 | return err; | |
1368 | } | |
1369 | ||
1370 | static void virtnet_get_channels(struct net_device *dev, | |
1371 | struct ethtool_channels *channels) | |
1372 | { | |
1373 | struct virtnet_info *vi = netdev_priv(dev); | |
1374 | ||
1375 | channels->combined_count = vi->curr_queue_pairs; | |
1376 | channels->max_combined = vi->max_queue_pairs; | |
1377 | channels->max_other = 0; | |
1378 | channels->rx_count = 0; | |
1379 | channels->tx_count = 0; | |
1380 | channels->other_count = 0; | |
1381 | } | |
1382 | ||
16032be5 NA |
1383 | /* Check if the user is trying to change anything besides speed/duplex */ |
1384 | static bool virtnet_validate_ethtool_cmd(const struct ethtool_cmd *cmd) | |
1385 | { | |
1386 | struct ethtool_cmd diff1 = *cmd; | |
1387 | struct ethtool_cmd diff2 = {}; | |
1388 | ||
0cf3ace9 NA |
1389 | /* cmd is always set so we need to clear it, validate the port type |
1390 | * and also without autonegotiation we can ignore advertising | |
1391 | */ | |
16032be5 | 1392 | ethtool_cmd_speed_set(&diff1, 0); |
0cf3ace9 | 1393 | diff2.port = PORT_OTHER; |
16032be5 NA |
1394 | diff1.advertising = 0; |
1395 | diff1.duplex = 0; | |
16032be5 NA |
1396 | diff1.cmd = 0; |
1397 | ||
1398 | return !memcmp(&diff1, &diff2, sizeof(diff1)); | |
1399 | } | |
1400 | ||
1401 | static int virtnet_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1402 | { | |
1403 | struct virtnet_info *vi = netdev_priv(dev); | |
1404 | u32 speed; | |
1405 | ||
1406 | speed = ethtool_cmd_speed(cmd); | |
1407 | /* don't allow custom speed and duplex */ | |
1408 | if (!ethtool_validate_speed(speed) || | |
1409 | !ethtool_validate_duplex(cmd->duplex) || | |
1410 | !virtnet_validate_ethtool_cmd(cmd)) | |
1411 | return -EINVAL; | |
1412 | vi->speed = speed; | |
1413 | vi->duplex = cmd->duplex; | |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | static int virtnet_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1419 | { | |
1420 | struct virtnet_info *vi = netdev_priv(dev); | |
1421 | ||
1422 | ethtool_cmd_speed_set(cmd, vi->speed); | |
1423 | cmd->duplex = vi->duplex; | |
1424 | cmd->port = PORT_OTHER; | |
1425 | ||
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | static void virtnet_init_settings(struct net_device *dev) | |
1430 | { | |
1431 | struct virtnet_info *vi = netdev_priv(dev); | |
1432 | ||
1433 | vi->speed = SPEED_UNKNOWN; | |
1434 | vi->duplex = DUPLEX_UNKNOWN; | |
1435 | } | |
1436 | ||
0fc0b732 | 1437 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1438 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1439 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1440 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1441 | .set_channels = virtnet_set_channels, |
1442 | .get_channels = virtnet_get_channels, | |
074c3582 | 1443 | .get_ts_info = ethtool_op_get_ts_info, |
16032be5 NA |
1444 | .get_settings = virtnet_get_settings, |
1445 | .set_settings = virtnet_set_settings, | |
a9ea3fc6 HX |
1446 | }; |
1447 | ||
39da5814 MM |
1448 | #define MIN_MTU 68 |
1449 | #define MAX_MTU 65535 | |
1450 | ||
1451 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
1452 | { | |
1453 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
1454 | return -EINVAL; | |
1455 | dev->mtu = new_mtu; | |
1456 | return 0; | |
1457 | } | |
1458 | ||
76288b4e SH |
1459 | static const struct net_device_ops virtnet_netdev = { |
1460 | .ndo_open = virtnet_open, | |
1461 | .ndo_stop = virtnet_close, | |
1462 | .ndo_start_xmit = start_xmit, | |
1463 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1464 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1465 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 1466 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 1467 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1468 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1469 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
1470 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1471 | .ndo_poll_controller = virtnet_netpoll, | |
1472 | #endif | |
91815639 JW |
1473 | #ifdef CONFIG_NET_RX_BUSY_POLL |
1474 | .ndo_busy_poll = virtnet_busy_poll, | |
1475 | #endif | |
76288b4e SH |
1476 | }; |
1477 | ||
586d17c5 | 1478 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1479 | { |
586d17c5 JW |
1480 | struct virtnet_info *vi = |
1481 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1482 | u16 v; |
1483 | ||
855e0c52 RR |
1484 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
1485 | struct virtio_net_config, status, &v) < 0) | |
507613bf | 1486 | return; |
586d17c5 JW |
1487 | |
1488 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1489 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1490 | virtnet_ack_link_announce(vi); |
1491 | } | |
9f4d26d0 MM |
1492 | |
1493 | /* Ignore unknown (future) status bits */ | |
1494 | v &= VIRTIO_NET_S_LINK_UP; | |
1495 | ||
1496 | if (vi->status == v) | |
507613bf | 1497 | return; |
9f4d26d0 MM |
1498 | |
1499 | vi->status = v; | |
1500 | ||
1501 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1502 | netif_carrier_on(vi->dev); | |
986a4f4d | 1503 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
1504 | } else { |
1505 | netif_carrier_off(vi->dev); | |
986a4f4d | 1506 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 MM |
1507 | } |
1508 | } | |
1509 | ||
1510 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1511 | { | |
1512 | struct virtnet_info *vi = vdev->priv; | |
1513 | ||
3b07e9ca | 1514 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1515 | } |
1516 | ||
986a4f4d JW |
1517 | static void virtnet_free_queues(struct virtnet_info *vi) |
1518 | { | |
d4fb84ee AV |
1519 | int i; |
1520 | ||
ab3971b1 JW |
1521 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1522 | napi_hash_del(&vi->rq[i].napi); | |
d4fb84ee | 1523 | netif_napi_del(&vi->rq[i].napi); |
ab3971b1 | 1524 | } |
d4fb84ee | 1525 | |
986a4f4d JW |
1526 | kfree(vi->rq); |
1527 | kfree(vi->sq); | |
1528 | } | |
1529 | ||
1530 | static void free_receive_bufs(struct virtnet_info *vi) | |
1531 | { | |
1532 | int i; | |
1533 | ||
1534 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1535 | while (vi->rq[i].pages) | |
1536 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
1537 | } | |
1538 | } | |
1539 | ||
fb51879d MD |
1540 | static void free_receive_page_frags(struct virtnet_info *vi) |
1541 | { | |
1542 | int i; | |
1543 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1544 | if (vi->rq[i].alloc_frag.page) | |
1545 | put_page(vi->rq[i].alloc_frag.page); | |
1546 | } | |
1547 | ||
986a4f4d JW |
1548 | static void free_unused_bufs(struct virtnet_info *vi) |
1549 | { | |
1550 | void *buf; | |
1551 | int i; | |
1552 | ||
1553 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1554 | struct virtqueue *vq = vi->sq[i].vq; | |
1555 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) | |
1556 | dev_kfree_skb(buf); | |
1557 | } | |
1558 | ||
1559 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1560 | struct virtqueue *vq = vi->rq[i].vq; | |
1561 | ||
1562 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
ab7db917 MD |
1563 | if (vi->mergeable_rx_bufs) { |
1564 | unsigned long ctx = (unsigned long)buf; | |
1565 | void *base = mergeable_ctx_to_buf_address(ctx); | |
1566 | put_page(virt_to_head_page(base)); | |
1567 | } else if (vi->big_packets) { | |
fa9fac17 | 1568 | give_pages(&vi->rq[i], buf); |
ab7db917 | 1569 | } else { |
986a4f4d | 1570 | dev_kfree_skb(buf); |
ab7db917 | 1571 | } |
986a4f4d | 1572 | } |
986a4f4d JW |
1573 | } |
1574 | } | |
1575 | ||
e9d7417b JW |
1576 | static void virtnet_del_vqs(struct virtnet_info *vi) |
1577 | { | |
1578 | struct virtio_device *vdev = vi->vdev; | |
1579 | ||
8898c21c | 1580 | virtnet_clean_affinity(vi, -1); |
986a4f4d | 1581 | |
e9d7417b | 1582 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
1583 | |
1584 | virtnet_free_queues(vi); | |
e9d7417b JW |
1585 | } |
1586 | ||
986a4f4d | 1587 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 1588 | { |
986a4f4d JW |
1589 | vq_callback_t **callbacks; |
1590 | struct virtqueue **vqs; | |
1591 | int ret = -ENOMEM; | |
1592 | int i, total_vqs; | |
1593 | const char **names; | |
1594 | ||
1595 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
1596 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
1597 | * possible control vq. | |
1598 | */ | |
1599 | total_vqs = vi->max_queue_pairs * 2 + | |
1600 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
1601 | ||
1602 | /* Allocate space for find_vqs parameters */ | |
1603 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
1604 | if (!vqs) | |
1605 | goto err_vq; | |
1606 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
1607 | if (!callbacks) | |
1608 | goto err_callback; | |
1609 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
1610 | if (!names) | |
1611 | goto err_names; | |
1612 | ||
1613 | /* Parameters for control virtqueue, if any */ | |
1614 | if (vi->has_cvq) { | |
1615 | callbacks[total_vqs - 1] = NULL; | |
1616 | names[total_vqs - 1] = "control"; | |
1617 | } | |
3f9c10b0 | 1618 | |
986a4f4d JW |
1619 | /* Allocate/initialize parameters for send/receive virtqueues */ |
1620 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1621 | callbacks[rxq2vq(i)] = skb_recv_done; | |
1622 | callbacks[txq2vq(i)] = skb_xmit_done; | |
1623 | sprintf(vi->rq[i].name, "input.%d", i); | |
1624 | sprintf(vi->sq[i].name, "output.%d", i); | |
1625 | names[rxq2vq(i)] = vi->rq[i].name; | |
1626 | names[txq2vq(i)] = vi->sq[i].name; | |
1627 | } | |
3f9c10b0 | 1628 | |
986a4f4d JW |
1629 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
1630 | names); | |
1631 | if (ret) | |
1632 | goto err_find; | |
3f9c10b0 | 1633 | |
986a4f4d JW |
1634 | if (vi->has_cvq) { |
1635 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 1636 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 1637 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 1638 | } |
986a4f4d JW |
1639 | |
1640 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1641 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
1642 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
1643 | } | |
1644 | ||
1645 | kfree(names); | |
1646 | kfree(callbacks); | |
1647 | kfree(vqs); | |
1648 | ||
3f9c10b0 | 1649 | return 0; |
986a4f4d JW |
1650 | |
1651 | err_find: | |
1652 | kfree(names); | |
1653 | err_names: | |
1654 | kfree(callbacks); | |
1655 | err_callback: | |
1656 | kfree(vqs); | |
1657 | err_vq: | |
1658 | return ret; | |
1659 | } | |
1660 | ||
1661 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
1662 | { | |
1663 | int i; | |
1664 | ||
1665 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
1666 | if (!vi->sq) | |
1667 | goto err_sq; | |
1668 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 1669 | if (!vi->rq) |
986a4f4d JW |
1670 | goto err_rq; |
1671 | ||
1672 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
1673 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1674 | vi->rq[i].pages = NULL; | |
1675 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
1676 | napi_weight); | |
1677 | ||
1678 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
5377d758 | 1679 | ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); |
986a4f4d JW |
1680 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); |
1681 | } | |
1682 | ||
1683 | return 0; | |
1684 | ||
1685 | err_rq: | |
1686 | kfree(vi->sq); | |
1687 | err_sq: | |
1688 | return -ENOMEM; | |
1689 | } | |
1690 | ||
1691 | static int init_vqs(struct virtnet_info *vi) | |
1692 | { | |
1693 | int ret; | |
1694 | ||
1695 | /* Allocate send & receive queues */ | |
1696 | ret = virtnet_alloc_queues(vi); | |
1697 | if (ret) | |
1698 | goto err; | |
1699 | ||
1700 | ret = virtnet_find_vqs(vi); | |
1701 | if (ret) | |
1702 | goto err_free; | |
1703 | ||
47be2479 | 1704 | get_online_cpus(); |
8898c21c | 1705 | virtnet_set_affinity(vi); |
47be2479 WG |
1706 | put_online_cpus(); |
1707 | ||
986a4f4d JW |
1708 | return 0; |
1709 | ||
1710 | err_free: | |
1711 | virtnet_free_queues(vi); | |
1712 | err: | |
1713 | return ret; | |
3f9c10b0 AS |
1714 | } |
1715 | ||
fbf28d78 MD |
1716 | #ifdef CONFIG_SYSFS |
1717 | static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, | |
1718 | struct rx_queue_attribute *attribute, char *buf) | |
1719 | { | |
1720 | struct virtnet_info *vi = netdev_priv(queue->dev); | |
1721 | unsigned int queue_index = get_netdev_rx_queue_index(queue); | |
5377d758 | 1722 | struct ewma_pkt_len *avg; |
fbf28d78 MD |
1723 | |
1724 | BUG_ON(queue_index >= vi->max_queue_pairs); | |
1725 | avg = &vi->rq[queue_index].mrg_avg_pkt_len; | |
1726 | return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); | |
1727 | } | |
1728 | ||
1729 | static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = | |
1730 | __ATTR_RO(mergeable_rx_buffer_size); | |
1731 | ||
1732 | static struct attribute *virtio_net_mrg_rx_attrs[] = { | |
1733 | &mergeable_rx_buffer_size_attribute.attr, | |
1734 | NULL | |
1735 | }; | |
1736 | ||
1737 | static const struct attribute_group virtio_net_mrg_rx_group = { | |
1738 | .name = "virtio_net", | |
1739 | .attrs = virtio_net_mrg_rx_attrs | |
1740 | }; | |
1741 | #endif | |
1742 | ||
892d6eb1 JW |
1743 | static bool virtnet_fail_on_feature(struct virtio_device *vdev, |
1744 | unsigned int fbit, | |
1745 | const char *fname, const char *dname) | |
1746 | { | |
1747 | if (!virtio_has_feature(vdev, fbit)) | |
1748 | return false; | |
1749 | ||
1750 | dev_err(&vdev->dev, "device advertises feature %s but not %s", | |
1751 | fname, dname); | |
1752 | ||
1753 | return true; | |
1754 | } | |
1755 | ||
1756 | #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ | |
1757 | virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) | |
1758 | ||
1759 | static bool virtnet_validate_features(struct virtio_device *vdev) | |
1760 | { | |
1761 | if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && | |
1762 | (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, | |
1763 | "VIRTIO_NET_F_CTRL_VQ") || | |
1764 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, | |
1765 | "VIRTIO_NET_F_CTRL_VQ") || | |
1766 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, | |
1767 | "VIRTIO_NET_F_CTRL_VQ") || | |
1768 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || | |
1769 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, | |
1770 | "VIRTIO_NET_F_CTRL_VQ"))) { | |
1771 | return false; | |
1772 | } | |
1773 | ||
1774 | return true; | |
1775 | } | |
1776 | ||
296f96fc RR |
1777 | static int virtnet_probe(struct virtio_device *vdev) |
1778 | { | |
986a4f4d | 1779 | int i, err; |
296f96fc RR |
1780 | struct net_device *dev; |
1781 | struct virtnet_info *vi; | |
986a4f4d JW |
1782 | u16 max_queue_pairs; |
1783 | ||
6ba42248 MT |
1784 | if (!vdev->config->get) { |
1785 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
1786 | __func__); | |
1787 | return -EINVAL; | |
1788 | } | |
1789 | ||
892d6eb1 JW |
1790 | if (!virtnet_validate_features(vdev)) |
1791 | return -EINVAL; | |
1792 | ||
986a4f4d | 1793 | /* Find if host supports multiqueue virtio_net device */ |
855e0c52 RR |
1794 | err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, |
1795 | struct virtio_net_config, | |
1796 | max_virtqueue_pairs, &max_queue_pairs); | |
986a4f4d JW |
1797 | |
1798 | /* We need at least 2 queue's */ | |
1799 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
1800 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
1801 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
1802 | max_queue_pairs = 1; | |
296f96fc RR |
1803 | |
1804 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 1805 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
1806 | if (!dev) |
1807 | return -ENOMEM; | |
1808 | ||
1809 | /* Set up network device as normal. */ | |
f2f2c8b4 | 1810 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 1811 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1812 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1813 | |
7ad24ea4 | 1814 | dev->ethtool_ops = &virtnet_ethtool_ops; |
296f96fc RR |
1815 | SET_NETDEV_DEV(dev, &vdev->dev); |
1816 | ||
1817 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1818 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1819 | /* This opens up the world of extra features. */ |
48900cb6 | 1820 | dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 | 1821 | if (csum) |
48900cb6 | 1822 | dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 MM |
1823 | |
1824 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
e3e3c423 | 1825 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO |
34a48579 RR |
1826 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1827 | } | |
5539ae96 | 1828 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1829 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1830 | dev->hw_features |= NETIF_F_TSO; | |
1831 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1832 | dev->hw_features |= NETIF_F_TSO6; | |
1833 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1834 | dev->hw_features |= NETIF_F_TSO_ECN; | |
e3e3c423 VY |
1835 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
1836 | dev->hw_features |= NETIF_F_UFO; | |
98e778c9 | 1837 | |
41f2f127 JW |
1838 | dev->features |= NETIF_F_GSO_ROBUST; |
1839 | ||
98e778c9 | 1840 | if (gso) |
e3e3c423 | 1841 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); |
98e778c9 | 1842 | /* (!csum && gso) case will be fixed by register_netdev() */ |
296f96fc | 1843 | } |
4f49129b TH |
1844 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
1845 | dev->features |= NETIF_F_RXCSUM; | |
296f96fc | 1846 | |
4fda8302 JW |
1847 | dev->vlan_features = dev->features; |
1848 | ||
296f96fc | 1849 | /* Configuration may specify what MAC to use. Otherwise random. */ |
855e0c52 RR |
1850 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
1851 | virtio_cread_bytes(vdev, | |
1852 | offsetof(struct virtio_net_config, mac), | |
1853 | dev->dev_addr, dev->addr_len); | |
1854 | else | |
f2cedb63 | 1855 | eth_hw_addr_random(dev); |
296f96fc RR |
1856 | |
1857 | /* Set up our device-specific information */ | |
1858 | vi = netdev_priv(dev); | |
296f96fc RR |
1859 | vi->dev = dev; |
1860 | vi->vdev = vdev; | |
d9d5dcc8 | 1861 | vdev->priv = vi; |
3fa2a1df | 1862 | vi->stats = alloc_percpu(struct virtnet_stats); |
1863 | err = -ENOMEM; | |
1864 | if (vi->stats == NULL) | |
1865 | goto free; | |
1866 | ||
827da44c JS |
1867 | for_each_possible_cpu(i) { |
1868 | struct virtnet_stats *virtnet_stats; | |
1869 | virtnet_stats = per_cpu_ptr(vi->stats, i); | |
1870 | u64_stats_init(&virtnet_stats->tx_syncp); | |
1871 | u64_stats_init(&virtnet_stats->rx_syncp); | |
1872 | } | |
1873 | ||
586d17c5 | 1874 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); |
296f96fc | 1875 | |
97402b96 | 1876 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1877 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1878 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
e3e3c423 VY |
1879 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
1880 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) | |
97402b96 HX |
1881 | vi->big_packets = true; |
1882 | ||
3f2c31d9 MM |
1883 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1884 | vi->mergeable_rx_bufs = true; | |
1885 | ||
d04302b3 MT |
1886 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || |
1887 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
012873d0 MT |
1888 | vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
1889 | else | |
1890 | vi->hdr_len = sizeof(struct virtio_net_hdr); | |
1891 | ||
75993300 MT |
1892 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || |
1893 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
e7428e95 MT |
1894 | vi->any_header_sg = true; |
1895 | ||
986a4f4d JW |
1896 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
1897 | vi->has_cvq = true; | |
1898 | ||
012873d0 MT |
1899 | if (vi->any_header_sg) |
1900 | dev->needed_headroom = vi->hdr_len; | |
6ebbc1a6 | 1901 | |
986a4f4d JW |
1902 | /* Use single tx/rx queue pair as default */ |
1903 | vi->curr_queue_pairs = 1; | |
1904 | vi->max_queue_pairs = max_queue_pairs; | |
1905 | ||
1906 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 1907 | err = init_vqs(vi); |
d2a7ddda | 1908 | if (err) |
9bb8ca86 | 1909 | goto free_stats; |
296f96fc | 1910 | |
fbf28d78 MD |
1911 | #ifdef CONFIG_SYSFS |
1912 | if (vi->mergeable_rx_bufs) | |
1913 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; | |
1914 | #endif | |
0f13b66b ZYW |
1915 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
1916 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); | |
986a4f4d | 1917 | |
16032be5 NA |
1918 | virtnet_init_settings(dev); |
1919 | ||
296f96fc RR |
1920 | err = register_netdev(dev); |
1921 | if (err) { | |
1922 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1923 | goto free_vqs; |
296f96fc | 1924 | } |
b3369c1f | 1925 | |
4baf1e33 MT |
1926 | virtio_device_ready(vdev); |
1927 | ||
8de4b2f3 WG |
1928 | vi->nb.notifier_call = &virtnet_cpu_callback; |
1929 | err = register_hotcpu_notifier(&vi->nb); | |
1930 | if (err) { | |
1931 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
f00e35e2 | 1932 | goto free_unregister_netdev; |
8de4b2f3 WG |
1933 | } |
1934 | ||
167c25e4 JW |
1935 | /* Assume link up if device can't report link status, |
1936 | otherwise get link status from config. */ | |
1937 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1938 | netif_carrier_off(dev); | |
3b07e9ca | 1939 | schedule_work(&vi->config_work); |
167c25e4 JW |
1940 | } else { |
1941 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1942 | netif_carrier_on(dev); | |
1943 | } | |
9f4d26d0 | 1944 | |
986a4f4d JW |
1945 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
1946 | dev->name, max_queue_pairs); | |
1947 | ||
296f96fc RR |
1948 | return 0; |
1949 | ||
f00e35e2 | 1950 | free_unregister_netdev: |
02465555 MT |
1951 | vi->vdev->config->reset(vdev); |
1952 | ||
b3369c1f | 1953 | unregister_netdev(dev); |
d2a7ddda | 1954 | free_vqs: |
986a4f4d | 1955 | cancel_delayed_work_sync(&vi->refill); |
fb51879d | 1956 | free_receive_page_frags(vi); |
e9d7417b | 1957 | virtnet_del_vqs(vi); |
3fa2a1df | 1958 | free_stats: |
1959 | free_percpu(vi->stats); | |
296f96fc RR |
1960 | free: |
1961 | free_netdev(dev); | |
1962 | return err; | |
1963 | } | |
1964 | ||
04486ed0 | 1965 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1966 | { |
04486ed0 | 1967 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1968 | |
1969 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1970 | free_unused_bufs(vi); |
fb6813f4 | 1971 | |
986a4f4d | 1972 | free_receive_bufs(vi); |
d2a7ddda | 1973 | |
fb51879d MD |
1974 | free_receive_page_frags(vi); |
1975 | ||
986a4f4d | 1976 | virtnet_del_vqs(vi); |
04486ed0 AS |
1977 | } |
1978 | ||
8cc085d6 | 1979 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
1980 | { |
1981 | struct virtnet_info *vi = vdev->priv; | |
1982 | ||
8de4b2f3 WG |
1983 | unregister_hotcpu_notifier(&vi->nb); |
1984 | ||
102a2786 MT |
1985 | /* Make sure no work handler is accessing the device. */ |
1986 | flush_work(&vi->config_work); | |
586d17c5 | 1987 | |
04486ed0 AS |
1988 | unregister_netdev(vi->dev); |
1989 | ||
1990 | remove_vq_common(vi); | |
fb6813f4 | 1991 | |
2e66f55b | 1992 | free_percpu(vi->stats); |
74b2553f | 1993 | free_netdev(vi->dev); |
296f96fc RR |
1994 | } |
1995 | ||
89107000 | 1996 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
1997 | static int virtnet_freeze(struct virtio_device *vdev) |
1998 | { | |
1999 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 2000 | int i; |
0741bcb5 | 2001 | |
ec9debbd JW |
2002 | unregister_hotcpu_notifier(&vi->nb); |
2003 | ||
102a2786 MT |
2004 | /* Make sure no work handler is accessing the device */ |
2005 | flush_work(&vi->config_work); | |
586d17c5 | 2006 | |
0741bcb5 AS |
2007 | netif_device_detach(vi->dev); |
2008 | cancel_delayed_work_sync(&vi->refill); | |
2009 | ||
91815639 | 2010 | if (netif_running(vi->dev)) { |
ab3971b1 | 2011 | for (i = 0; i < vi->max_queue_pairs; i++) |
986a4f4d | 2012 | napi_disable(&vi->rq[i].napi); |
91815639 | 2013 | } |
0741bcb5 AS |
2014 | |
2015 | remove_vq_common(vi); | |
2016 | ||
2017 | return 0; | |
2018 | } | |
2019 | ||
2020 | static int virtnet_restore(struct virtio_device *vdev) | |
2021 | { | |
2022 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 2023 | int err, i; |
0741bcb5 AS |
2024 | |
2025 | err = init_vqs(vi); | |
2026 | if (err) | |
2027 | return err; | |
2028 | ||
e53fbd11 MT |
2029 | virtio_device_ready(vdev); |
2030 | ||
6cd4ce00 JW |
2031 | if (netif_running(vi->dev)) { |
2032 | for (i = 0; i < vi->curr_queue_pairs; i++) | |
946fa564 | 2033 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
6cd4ce00 JW |
2034 | schedule_delayed_work(&vi->refill, 0); |
2035 | ||
986a4f4d JW |
2036 | for (i = 0; i < vi->max_queue_pairs; i++) |
2037 | virtnet_napi_enable(&vi->rq[i]); | |
6cd4ce00 | 2038 | } |
0741bcb5 AS |
2039 | |
2040 | netif_device_attach(vi->dev); | |
2041 | ||
35ed159b | 2042 | rtnl_lock(); |
986a4f4d | 2043 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
35ed159b | 2044 | rtnl_unlock(); |
986a4f4d | 2045 | |
ec9debbd JW |
2046 | err = register_hotcpu_notifier(&vi->nb); |
2047 | if (err) | |
2048 | return err; | |
2049 | ||
0741bcb5 AS |
2050 | return 0; |
2051 | } | |
2052 | #endif | |
2053 | ||
296f96fc RR |
2054 | static struct virtio_device_id id_table[] = { |
2055 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
2056 | { 0 }, | |
2057 | }; | |
2058 | ||
c45a6816 | 2059 | static unsigned int features[] = { |
5e4fe5c4 MM |
2060 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
2061 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
e3e3c423 | 2062 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 2063 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
e3e3c423 | 2064 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 2065 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 2066 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
986a4f4d | 2067 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, |
7e58d5ae | 2068 | VIRTIO_NET_F_CTRL_MAC_ADDR, |
e7428e95 | 2069 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
2070 | }; |
2071 | ||
22402529 | 2072 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
2073 | .feature_table = features, |
2074 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
2075 | .driver.name = KBUILD_MODNAME, |
2076 | .driver.owner = THIS_MODULE, | |
2077 | .id_table = id_table, | |
2078 | .probe = virtnet_probe, | |
8cc085d6 | 2079 | .remove = virtnet_remove, |
9f4d26d0 | 2080 | .config_changed = virtnet_config_changed, |
89107000 | 2081 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
2082 | .freeze = virtnet_freeze, |
2083 | .restore = virtnet_restore, | |
2084 | #endif | |
296f96fc RR |
2085 | }; |
2086 | ||
b2a17029 | 2087 | module_virtio_driver(virtio_net_driver); |
296f96fc RR |
2088 | |
2089 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2090 | MODULE_DESCRIPTION("Virtio network driver"); | |
2091 | MODULE_LICENSE("GPL"); |