Commit | Line | Data |
---|---|---|
48925e37 | 1 | /* A network driver using virtio. |
296f96fc RR |
2 | * |
3 | * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | //#define DEBUG | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 22 | #include <linux/ethtool.h> |
296f96fc RR |
23 | #include <linux/module.h> |
24 | #include <linux/virtio.h> | |
25 | #include <linux/virtio_net.h> | |
26 | #include <linux/scatterlist.h> | |
e918085a | 27 | #include <linux/if_vlan.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
8de4b2f3 | 29 | #include <linux/cpu.h> |
296f96fc | 30 | |
d34710e3 | 31 | static int napi_weight = NAPI_POLL_WEIGHT; |
6c0cd7c0 DL |
32 | module_param(napi_weight, int, 0444); |
33 | ||
eb939922 | 34 | static bool csum = true, gso = true; |
34a48579 RR |
35 | module_param(csum, bool, 0444); |
36 | module_param(gso, bool, 0444); | |
37 | ||
296f96fc | 38 | /* FIXME: MTU in config. */ |
e918085a | 39 | #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 40 | #define GOOD_COPY_LEN 128 |
296f96fc | 41 | |
66846048 | 42 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 43 | |
3fa2a1df | 44 | struct virtnet_stats { |
83a27052 ED |
45 | struct u64_stats_sync tx_syncp; |
46 | struct u64_stats_sync rx_syncp; | |
3fa2a1df | 47 | u64 tx_bytes; |
48 | u64 tx_packets; | |
49 | ||
50 | u64 rx_bytes; | |
51 | u64 rx_packets; | |
52 | }; | |
53 | ||
e9d7417b JW |
54 | /* Internal representation of a send virtqueue */ |
55 | struct send_queue { | |
56 | /* Virtqueue associated with this send _queue */ | |
57 | struct virtqueue *vq; | |
58 | ||
59 | /* TX: fragments + linear part + virtio header */ | |
60 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
61 | |
62 | /* Name of the send queue: output.$index */ | |
63 | char name[40]; | |
e9d7417b JW |
64 | }; |
65 | ||
66 | /* Internal representation of a receive virtqueue */ | |
67 | struct receive_queue { | |
68 | /* Virtqueue associated with this receive_queue */ | |
69 | struct virtqueue *vq; | |
70 | ||
296f96fc RR |
71 | struct napi_struct napi; |
72 | ||
73 | /* Number of input buffers, and max we've ever had. */ | |
74 | unsigned int num, max; | |
75 | ||
e9d7417b JW |
76 | /* Chain pages by the private ptr. */ |
77 | struct page *pages; | |
78 | ||
79 | /* RX: fragments + linear part + virtio header */ | |
80 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
81 | |
82 | /* Name of this receive queue: input.$index */ | |
83 | char name[40]; | |
e9d7417b JW |
84 | }; |
85 | ||
86 | struct virtnet_info { | |
87 | struct virtio_device *vdev; | |
88 | struct virtqueue *cvq; | |
89 | struct net_device *dev; | |
986a4f4d JW |
90 | struct send_queue *sq; |
91 | struct receive_queue *rq; | |
e9d7417b JW |
92 | unsigned int status; |
93 | ||
986a4f4d JW |
94 | /* Max # of queue pairs supported by the device */ |
95 | u16 max_queue_pairs; | |
96 | ||
97 | /* # of queue pairs currently used by the driver */ | |
98 | u16 curr_queue_pairs; | |
99 | ||
97402b96 HX |
100 | /* I like... big packets and I cannot lie! */ |
101 | bool big_packets; | |
102 | ||
3f2c31d9 MM |
103 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
104 | bool mergeable_rx_bufs; | |
105 | ||
986a4f4d JW |
106 | /* Has control virtqueue */ |
107 | bool has_cvq; | |
108 | ||
586d17c5 JW |
109 | /* enable config space updates */ |
110 | bool config_enable; | |
111 | ||
3fa2a1df | 112 | /* Active statistics */ |
113 | struct virtnet_stats __percpu *stats; | |
114 | ||
3161e453 RR |
115 | /* Work struct for refilling if we run low on memory. */ |
116 | struct delayed_work refill; | |
117 | ||
586d17c5 JW |
118 | /* Work struct for config space updates */ |
119 | struct work_struct config_work; | |
120 | ||
121 | /* Lock for config space updates */ | |
122 | struct mutex config_lock; | |
986a4f4d JW |
123 | |
124 | /* Does the affinity hint is set for virtqueues? */ | |
125 | bool affinity_hint_set; | |
47be2479 WG |
126 | |
127 | /* Per-cpu variable to show the mapping from CPU to virtqueue */ | |
128 | int __percpu *vq_index; | |
8de4b2f3 WG |
129 | |
130 | /* CPU hot plug notifier */ | |
131 | struct notifier_block nb; | |
296f96fc RR |
132 | }; |
133 | ||
b3f24698 RR |
134 | struct skb_vnet_hdr { |
135 | union { | |
136 | struct virtio_net_hdr hdr; | |
137 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
138 | }; | |
139 | }; | |
140 | ||
9ab86bbc SM |
141 | struct padded_vnet_hdr { |
142 | struct virtio_net_hdr hdr; | |
143 | /* | |
144 | * virtio_net_hdr should be in a separated sg buffer because of a | |
145 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
146 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
147 | */ | |
148 | char padding[6]; | |
149 | }; | |
150 | ||
986a4f4d JW |
151 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
152 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
153 | */ | |
154 | static int vq2txq(struct virtqueue *vq) | |
155 | { | |
9d0ca6ed | 156 | return (vq->index - 1) / 2; |
986a4f4d JW |
157 | } |
158 | ||
159 | static int txq2vq(int txq) | |
160 | { | |
161 | return txq * 2 + 1; | |
162 | } | |
163 | ||
164 | static int vq2rxq(struct virtqueue *vq) | |
165 | { | |
9d0ca6ed | 166 | return vq->index / 2; |
986a4f4d JW |
167 | } |
168 | ||
169 | static int rxq2vq(int rxq) | |
170 | { | |
171 | return rxq * 2; | |
172 | } | |
173 | ||
b3f24698 | 174 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 175 | { |
b3f24698 | 176 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
177 | } |
178 | ||
9ab86bbc SM |
179 | /* |
180 | * private is used to chain pages for big packets, put the whole | |
181 | * most recent used list in the beginning for reuse | |
182 | */ | |
e9d7417b | 183 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 184 | { |
9ab86bbc | 185 | struct page *end; |
0a888fd1 | 186 | |
e9d7417b | 187 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 188 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
189 | end->private = (unsigned long)rq->pages; |
190 | rq->pages = page; | |
0a888fd1 MM |
191 | } |
192 | ||
e9d7417b | 193 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 194 | { |
e9d7417b | 195 | struct page *p = rq->pages; |
fb6813f4 | 196 | |
9ab86bbc | 197 | if (p) { |
e9d7417b | 198 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
199 | /* clear private here, it is used to chain pages */ |
200 | p->private = 0; | |
201 | } else | |
fb6813f4 RR |
202 | p = alloc_page(gfp_mask); |
203 | return p; | |
204 | } | |
205 | ||
e9d7417b | 206 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 207 | { |
e9d7417b | 208 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 209 | |
2cb9c6ba | 210 | /* Suppress further interrupts. */ |
e9d7417b | 211 | virtqueue_disable_cb(vq); |
11a3a154 | 212 | |
363f1514 | 213 | /* We were probably waiting for more output buffers. */ |
986a4f4d | 214 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
296f96fc RR |
215 | } |
216 | ||
9ab86bbc SM |
217 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
218 | unsigned int offset, unsigned int *len) | |
296f96fc | 219 | { |
8a59a7b9 | 220 | int size = min((unsigned)PAGE_SIZE - offset, *len); |
9ab86bbc | 221 | int i = skb_shinfo(skb)->nr_frags; |
9ab86bbc | 222 | |
8a59a7b9 | 223 | __skb_fill_page_desc(skb, i, page, offset, size); |
9ab86bbc | 224 | |
8a59a7b9 KK |
225 | skb->data_len += size; |
226 | skb->len += size; | |
4b727361 | 227 | skb->truesize += PAGE_SIZE; |
9ab86bbc | 228 | skb_shinfo(skb)->nr_frags++; |
c9af6db4 | 229 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
8a59a7b9 | 230 | *len -= size; |
9ab86bbc | 231 | } |
23cde76d | 232 | |
3464645a | 233 | /* Called from bottom half context */ |
e9d7417b | 234 | static struct sk_buff *page_to_skb(struct receive_queue *rq, |
9ab86bbc SM |
235 | struct page *page, unsigned int len) |
236 | { | |
e9d7417b | 237 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc SM |
238 | struct sk_buff *skb; |
239 | struct skb_vnet_hdr *hdr; | |
240 | unsigned int copy, hdr_len, offset; | |
241 | char *p; | |
fb6813f4 | 242 | |
9ab86bbc | 243 | p = page_address(page); |
3f2c31d9 | 244 | |
9ab86bbc SM |
245 | /* copy small packet so we can reuse these pages for small data */ |
246 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
247 | if (unlikely(!skb)) | |
248 | return NULL; | |
3f2c31d9 | 249 | |
9ab86bbc | 250 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 251 | |
9ab86bbc SM |
252 | if (vi->mergeable_rx_bufs) { |
253 | hdr_len = sizeof hdr->mhdr; | |
254 | offset = hdr_len; | |
255 | } else { | |
256 | hdr_len = sizeof hdr->hdr; | |
257 | offset = sizeof(struct padded_vnet_hdr); | |
258 | } | |
3f2c31d9 | 259 | |
9ab86bbc | 260 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 261 | |
9ab86bbc SM |
262 | len -= hdr_len; |
263 | p += offset; | |
3f2c31d9 | 264 | |
9ab86bbc SM |
265 | copy = len; |
266 | if (copy > skb_tailroom(skb)) | |
267 | copy = skb_tailroom(skb); | |
268 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 269 | |
9ab86bbc SM |
270 | len -= copy; |
271 | offset += copy; | |
3f2c31d9 | 272 | |
e878d78b SL |
273 | /* |
274 | * Verify that we can indeed put this data into a skb. | |
275 | * This is here to handle cases when the device erroneously | |
276 | * tries to receive more than is possible. This is usually | |
277 | * the case of a broken device. | |
278 | */ | |
279 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 280 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
281 | dev_kfree_skb(skb); |
282 | return NULL; | |
283 | } | |
284 | ||
9ab86bbc SM |
285 | while (len) { |
286 | set_skb_frag(skb, page, offset, &len); | |
287 | page = (struct page *)page->private; | |
288 | offset = 0; | |
289 | } | |
3f2c31d9 | 290 | |
9ab86bbc | 291 | if (page) |
e9d7417b | 292 | give_pages(rq, page); |
3f2c31d9 | 293 | |
9ab86bbc SM |
294 | return skb; |
295 | } | |
3f2c31d9 | 296 | |
59d2a52e MT |
297 | static struct sk_buff *receive_small(void *buf, unsigned int len) |
298 | { | |
299 | struct sk_buff * skb = buf; | |
300 | ||
301 | len -= sizeof(struct virtio_net_hdr); | |
302 | skb_trim(skb, len); | |
303 | ||
304 | return skb; | |
305 | } | |
306 | ||
307 | static struct sk_buff *receive_big(struct net_device *dev, | |
308 | struct receive_queue *rq, | |
309 | void *buf) | |
310 | { | |
311 | struct page *page = buf; | |
312 | struct sk_buff *skb = page_to_skb(rq, page, 0); | |
313 | ||
314 | if (unlikely(!skb)) | |
315 | goto err; | |
316 | ||
317 | return skb; | |
318 | ||
319 | err: | |
320 | dev->stats.rx_dropped++; | |
321 | give_pages(rq, page); | |
322 | return NULL; | |
323 | } | |
324 | ||
e32904ec MT |
325 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
326 | struct receive_queue *rq, | |
327 | void *buf, | |
328 | unsigned int len) | |
9ab86bbc | 329 | { |
e32904ec MT |
330 | struct skb_vnet_hdr *hdr = page_address(buf); |
331 | int num_buf = hdr->mhdr.num_buffers; | |
332 | struct page *page = buf; | |
333 | struct sk_buff *skb = page_to_skb(rq, page, len); | |
334 | int i; | |
335 | ||
336 | if (unlikely(!skb)) | |
337 | goto err_skb; | |
9ab86bbc | 338 | |
9ab86bbc SM |
339 | while (--num_buf) { |
340 | i = skb_shinfo(skb)->nr_frags; | |
341 | if (i >= MAX_SKB_FRAGS) { | |
342 | pr_debug("%s: packet too long\n", skb->dev->name); | |
343 | skb->dev->stats.rx_length_errors++; | |
fcd8e312 | 344 | goto err_frags; |
9ab86bbc | 345 | } |
e9d7417b | 346 | page = virtqueue_get_buf(rq->vq, &len); |
9ab86bbc | 347 | if (!page) { |
e32904ec MT |
348 | pr_debug("%s: rx error: %d buffers %d missing\n", |
349 | dev->name, hdr->mhdr.num_buffers, num_buf); | |
350 | dev->stats.rx_length_errors++; | |
351 | goto err_buf; | |
3f2c31d9 | 352 | } |
3fa2a1df | 353 | |
9ab86bbc SM |
354 | if (len > PAGE_SIZE) |
355 | len = PAGE_SIZE; | |
356 | ||
357 | set_skb_frag(skb, page, 0, &len); | |
358 | ||
e9d7417b | 359 | --rq->num; |
9ab86bbc | 360 | } |
e32904ec MT |
361 | return skb; |
362 | err_skb: | |
363 | give_pages(rq, page); | |
364 | while (--num_buf) { | |
fcd8e312 | 365 | err_frags: |
e32904ec MT |
366 | buf = virtqueue_get_buf(rq->vq, &len); |
367 | if (unlikely(!buf)) { | |
368 | pr_debug("%s: rx error: %d buffers missing\n", | |
369 | dev->name, num_buf); | |
370 | dev->stats.rx_length_errors++; | |
371 | break; | |
372 | } | |
373 | page = buf; | |
374 | give_pages(rq, page); | |
375 | --rq->num; | |
376 | } | |
377 | err_buf: | |
378 | dev->stats.rx_dropped++; | |
379 | dev_kfree_skb(skb); | |
380 | return NULL; | |
9ab86bbc SM |
381 | } |
382 | ||
e9d7417b | 383 | static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) |
9ab86bbc | 384 | { |
e9d7417b JW |
385 | struct virtnet_info *vi = rq->vq->vdev->priv; |
386 | struct net_device *dev = vi->dev; | |
58472a76 | 387 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc | 388 | struct sk_buff *skb; |
9ab86bbc | 389 | struct skb_vnet_hdr *hdr; |
3f2c31d9 | 390 | |
9ab86bbc SM |
391 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
392 | pr_debug("%s: short packet %i\n", dev->name, len); | |
393 | dev->stats.rx_length_errors++; | |
394 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
e9d7417b | 395 | give_pages(rq, buf); |
9ab86bbc SM |
396 | else |
397 | dev_kfree_skb(buf); | |
398 | return; | |
399 | } | |
59d2a52e MT |
400 | if (vi->mergeable_rx_bufs) |
401 | skb = receive_mergeable(dev, rq, buf, len); | |
402 | else if (vi->big_packets) | |
403 | skb = receive_big(dev, rq, buf); | |
404 | else | |
405 | skb = receive_small(buf, len); | |
3f2c31d9 | 406 | |
59d2a52e MT |
407 | if (unlikely(!skb)) |
408 | return; | |
3f2c31d9 | 409 | |
9ab86bbc | 410 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 411 | |
83a27052 | 412 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 413 | stats->rx_bytes += skb->len; |
414 | stats->rx_packets++; | |
83a27052 | 415 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 416 | |
b3f24698 | 417 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 418 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
419 | if (!skb_partial_csum_set(skb, |
420 | hdr->hdr.csum_start, | |
421 | hdr->hdr.csum_offset)) | |
296f96fc | 422 | goto frame_err; |
10a8d94a JW |
423 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
424 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
425 | } |
426 | ||
23cde76d MM |
427 | skb->protocol = eth_type_trans(skb, dev); |
428 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
429 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
430 | ||
b3f24698 | 431 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 432 | pr_debug("GSO!\n"); |
b3f24698 | 433 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc | 434 | case VIRTIO_NET_HDR_GSO_TCPV4: |
c9af6db4 | 435 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
296f96fc | 436 | break; |
296f96fc | 437 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 438 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
296f96fc RR |
439 | break; |
440 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 441 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
296f96fc RR |
442 | break; |
443 | default: | |
be443899 AW |
444 | net_warn_ratelimited("%s: bad gso type %u.\n", |
445 | dev->name, hdr->hdr.gso_type); | |
296f96fc RR |
446 | goto frame_err; |
447 | } | |
448 | ||
b3f24698 | 449 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
c9af6db4 | 450 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
34a48579 | 451 | |
b3f24698 | 452 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc | 453 | if (skb_shinfo(skb)->gso_size == 0) { |
be443899 | 454 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
296f96fc RR |
455 | goto frame_err; |
456 | } | |
457 | ||
458 | /* Header must be checked, and gso_segs computed. */ | |
459 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
460 | skb_shinfo(skb)->gso_segs = 0; | |
461 | } | |
462 | ||
463 | netif_receive_skb(skb); | |
464 | return; | |
465 | ||
466 | frame_err: | |
467 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
468 | dev_kfree_skb(skb); |
469 | } | |
470 | ||
e9d7417b | 471 | static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp) |
296f96fc | 472 | { |
e9d7417b | 473 | struct virtnet_info *vi = rq->vq->vdev->priv; |
296f96fc | 474 | struct sk_buff *skb; |
9ab86bbc | 475 | struct skb_vnet_hdr *hdr; |
9ab86bbc | 476 | int err; |
3f2c31d9 | 477 | |
3464645a | 478 | skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp); |
9ab86bbc SM |
479 | if (unlikely(!skb)) |
480 | return -ENOMEM; | |
296f96fc | 481 | |
9ab86bbc | 482 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 483 | |
9ab86bbc | 484 | hdr = skb_vnet_hdr(skb); |
e9d7417b | 485 | sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr); |
97402b96 | 486 | |
e9d7417b | 487 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
97402b96 | 488 | |
9dc7b9e4 | 489 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp); |
9ab86bbc SM |
490 | if (err < 0) |
491 | dev_kfree_skb(skb); | |
97402b96 | 492 | |
9ab86bbc SM |
493 | return err; |
494 | } | |
97402b96 | 495 | |
e9d7417b | 496 | static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 497 | { |
9ab86bbc SM |
498 | struct page *first, *list = NULL; |
499 | char *p; | |
500 | int i, err, offset; | |
501 | ||
e9d7417b | 502 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 503 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 504 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
505 | if (!first) { |
506 | if (list) | |
e9d7417b | 507 | give_pages(rq, list); |
9ab86bbc | 508 | return -ENOMEM; |
97402b96 | 509 | } |
e9d7417b | 510 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 511 | |
9ab86bbc SM |
512 | /* chain new page in list head to match sg */ |
513 | first->private = (unsigned long)list; | |
514 | list = first; | |
515 | } | |
296f96fc | 516 | |
e9d7417b | 517 | first = get_a_page(rq, gfp); |
9ab86bbc | 518 | if (!first) { |
e9d7417b | 519 | give_pages(rq, list); |
9ab86bbc SM |
520 | return -ENOMEM; |
521 | } | |
522 | p = page_address(first); | |
523 | ||
e9d7417b JW |
524 | /* rq->sg[0], rq->sg[1] share the same page */ |
525 | /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */ | |
526 | sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr)); | |
9ab86bbc | 527 | |
e9d7417b | 528 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 529 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 530 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
531 | |
532 | /* chain first in list head */ | |
533 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
534 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
535 | first, gfp); | |
9ab86bbc | 536 | if (err < 0) |
e9d7417b | 537 | give_pages(rq, first); |
9ab86bbc SM |
538 | |
539 | return err; | |
296f96fc RR |
540 | } |
541 | ||
e9d7417b | 542 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) |
3f2c31d9 | 543 | { |
9ab86bbc | 544 | struct page *page; |
3f2c31d9 | 545 | int err; |
3f2c31d9 | 546 | |
e9d7417b | 547 | page = get_a_page(rq, gfp); |
9ab86bbc SM |
548 | if (!page) |
549 | return -ENOMEM; | |
3f2c31d9 | 550 | |
e9d7417b | 551 | sg_init_one(rq->sg, page_address(page), PAGE_SIZE); |
3f2c31d9 | 552 | |
9dc7b9e4 | 553 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, page, gfp); |
9ab86bbc | 554 | if (err < 0) |
e9d7417b | 555 | give_pages(rq, page); |
3f2c31d9 | 556 | |
9ab86bbc SM |
557 | return err; |
558 | } | |
3f2c31d9 | 559 | |
b2baed69 RR |
560 | /* |
561 | * Returns false if we couldn't fill entirely (OOM). | |
562 | * | |
563 | * Normally run in the receive path, but can also be run from ndo_open | |
564 | * before we're receiving packets, or from refill_work which is | |
565 | * careful to disable receiving (using napi_disable). | |
566 | */ | |
e9d7417b | 567 | static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 568 | { |
e9d7417b | 569 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc | 570 | int err; |
1788f495 | 571 | bool oom; |
3f2c31d9 | 572 | |
9ab86bbc SM |
573 | do { |
574 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 575 | err = add_recvbuf_mergeable(rq, gfp); |
9ab86bbc | 576 | else if (vi->big_packets) |
e9d7417b | 577 | err = add_recvbuf_big(rq, gfp); |
9ab86bbc | 578 | else |
e9d7417b | 579 | err = add_recvbuf_small(rq, gfp); |
3f2c31d9 | 580 | |
1788f495 | 581 | oom = err == -ENOMEM; |
9ed4cb07 | 582 | if (err) |
3f2c31d9 | 583 | break; |
e9d7417b | 584 | ++rq->num; |
b7dfde95 | 585 | } while (rq->vq->num_free); |
e9d7417b JW |
586 | if (unlikely(rq->num > rq->max)) |
587 | rq->max = rq->num; | |
588 | virtqueue_kick(rq->vq); | |
3161e453 | 589 | return !oom; |
3f2c31d9 MM |
590 | } |
591 | ||
18445c4d | 592 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
593 | { |
594 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 595 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 596 | |
18445c4d | 597 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 598 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 599 | virtqueue_disable_cb(rvq); |
e9d7417b | 600 | __napi_schedule(&rq->napi); |
18445c4d | 601 | } |
296f96fc RR |
602 | } |
603 | ||
e9d7417b | 604 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 605 | { |
e9d7417b | 606 | napi_enable(&rq->napi); |
3e9d08ec BR |
607 | |
608 | /* If all buffers were filled by other side before we napi_enabled, we | |
609 | * won't get another interrupt, so process any outstanding packets | |
610 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
611 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
612 | if (napi_schedule_prep(&rq->napi)) { |
613 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 614 | local_bh_disable(); |
e9d7417b | 615 | __napi_schedule(&rq->napi); |
ec13ee80 | 616 | local_bh_enable(); |
3e9d08ec BR |
617 | } |
618 | } | |
619 | ||
3161e453 RR |
620 | static void refill_work(struct work_struct *work) |
621 | { | |
e9d7417b JW |
622 | struct virtnet_info *vi = |
623 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 624 | bool still_empty; |
986a4f4d JW |
625 | int i; |
626 | ||
55257d72 | 627 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 628 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 629 | |
986a4f4d JW |
630 | napi_disable(&rq->napi); |
631 | still_empty = !try_fill_recv(rq, GFP_KERNEL); | |
632 | virtnet_napi_enable(rq); | |
3161e453 | 633 | |
986a4f4d JW |
634 | /* In theory, this can happen: if we don't get any buffers in |
635 | * we will *never* try to fill again. | |
636 | */ | |
637 | if (still_empty) | |
638 | schedule_delayed_work(&vi->refill, HZ/2); | |
639 | } | |
3161e453 RR |
640 | } |
641 | ||
296f96fc RR |
642 | static int virtnet_poll(struct napi_struct *napi, int budget) |
643 | { | |
e9d7417b JW |
644 | struct receive_queue *rq = |
645 | container_of(napi, struct receive_queue, napi); | |
646 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
9ab86bbc | 647 | void *buf; |
2b0e8a4f | 648 | unsigned int r, len, received = 0; |
296f96fc RR |
649 | |
650 | again: | |
651 | while (received < budget && | |
e9d7417b JW |
652 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
653 | receive_buf(rq, buf, len); | |
654 | --rq->num; | |
296f96fc RR |
655 | received++; |
656 | } | |
657 | ||
e9d7417b JW |
658 | if (rq->num < rq->max / 2) { |
659 | if (!try_fill_recv(rq, GFP_ATOMIC)) | |
3b07e9ca | 660 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 661 | } |
296f96fc | 662 | |
8329d98e RR |
663 | /* Out of packets? */ |
664 | if (received < budget) { | |
2b0e8a4f | 665 | r = virtqueue_enable_cb_prepare(rq->vq); |
288379f0 | 666 | napi_complete(napi); |
2b0e8a4f | 667 | if (unlikely(virtqueue_poll(rq->vq, r)) && |
8e95a202 | 668 | napi_schedule_prep(napi)) { |
e9d7417b | 669 | virtqueue_disable_cb(rq->vq); |
288379f0 | 670 | __napi_schedule(napi); |
296f96fc | 671 | goto again; |
4265f161 | 672 | } |
296f96fc RR |
673 | } |
674 | ||
675 | return received; | |
676 | } | |
677 | ||
986a4f4d JW |
678 | static int virtnet_open(struct net_device *dev) |
679 | { | |
680 | struct virtnet_info *vi = netdev_priv(dev); | |
681 | int i; | |
682 | ||
e4166625 JW |
683 | for (i = 0; i < vi->max_queue_pairs; i++) { |
684 | if (i < vi->curr_queue_pairs) | |
685 | /* Make sure we have some buffers: if oom use wq. */ | |
686 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
687 | schedule_delayed_work(&vi->refill, 0); | |
986a4f4d JW |
688 | virtnet_napi_enable(&vi->rq[i]); |
689 | } | |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
b7dfde95 | 694 | static void free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
695 | { |
696 | struct sk_buff *skb; | |
6ee57bcc | 697 | unsigned int len; |
e9d7417b | 698 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 699 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 700 | |
e9d7417b | 701 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 702 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 703 | |
83a27052 | 704 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 705 | stats->tx_bytes += skb->len; |
706 | stats->tx_packets++; | |
83a27052 | 707 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 708 | |
ed79bab8 | 709 | dev_kfree_skb_any(skb); |
296f96fc RR |
710 | } |
711 | } | |
712 | ||
e9d7417b | 713 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 714 | { |
b3f24698 | 715 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
296f96fc | 716 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 717 | struct virtnet_info *vi = sq->vq->vdev->priv; |
7bedc7dc | 718 | unsigned num_sg; |
296f96fc | 719 | |
e174961c | 720 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 721 | |
296f96fc | 722 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 723 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
55508d60 | 724 | hdr->hdr.csum_start = skb_checksum_start_offset(skb); |
b3f24698 | 725 | hdr->hdr.csum_offset = skb->csum_offset; |
296f96fc | 726 | } else { |
b3f24698 RR |
727 | hdr->hdr.flags = 0; |
728 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
729 | } |
730 | ||
731 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
732 | hdr->hdr.hdr_len = skb_headlen(skb); |
733 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 734 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 735 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 736 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 737 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 738 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 739 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
740 | else |
741 | BUG(); | |
34a48579 | 742 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 743 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 744 | } else { |
b3f24698 RR |
745 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
746 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
747 | } |
748 | ||
b3f24698 | 749 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 MM |
750 | |
751 | /* Encode metadata header at front. */ | |
752 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 753 | sg_set_buf(sq->sg, &hdr->mhdr, sizeof hdr->mhdr); |
3f2c31d9 | 754 | else |
e9d7417b | 755 | sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr); |
3f2c31d9 | 756 | |
b7dfde95 | 757 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; |
9dc7b9e4 | 758 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
759 | } |
760 | ||
424efe9c | 761 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
762 | { |
763 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
764 | int qnum = skb_get_queue_mapping(skb); |
765 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 766 | int err; |
2cb9c6ba | 767 | |
2cb9c6ba | 768 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 769 | free_old_xmit_skbs(sq); |
99ffc696 | 770 | |
03f191ba | 771 | /* Try to transmit */ |
b7dfde95 | 772 | err = xmit_skb(sq, skb); |
48925e37 | 773 | |
9ed4cb07 | 774 | /* This should not happen! */ |
0e3daa64 | 775 | if (unlikely(err)) { |
9ed4cb07 RR |
776 | dev->stats.tx_fifo_errors++; |
777 | if (net_ratelimit()) | |
778 | dev_warn(&dev->dev, | |
b7dfde95 | 779 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d RR |
780 | dev->stats.tx_dropped++; |
781 | kfree_skb(skb); | |
782 | return NETDEV_TX_OK; | |
296f96fc | 783 | } |
e9d7417b | 784 | virtqueue_kick(sq->vq); |
03f191ba | 785 | |
48925e37 RR |
786 | /* Don't wait up for transmitted skbs to be freed. */ |
787 | skb_orphan(skb); | |
788 | nf_reset(skb); | |
789 | ||
790 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
791 | * before it gets out of hand. Naturally, this wastes entries. */ | |
b7dfde95 | 792 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 793 | netif_stop_subqueue(dev, qnum); |
e9d7417b | 794 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 795 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
796 | free_old_xmit_skbs(sq); |
797 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 798 | netif_start_subqueue(dev, qnum); |
e9d7417b | 799 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
800 | } |
801 | } | |
99ffc696 | 802 | } |
48925e37 RR |
803 | |
804 | return NETDEV_TX_OK; | |
296f96fc RR |
805 | } |
806 | ||
40cbfc37 AK |
807 | /* |
808 | * Send command via the control virtqueue and check status. Commands | |
809 | * supported by the hypervisor, as indicated by feature bits, should | |
810 | * never fail unless improperly formated. | |
811 | */ | |
812 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
f7bc9594 RR |
813 | struct scatterlist *out, |
814 | struct scatterlist *in) | |
40cbfc37 | 815 | { |
f7bc9594 | 816 | struct scatterlist *sgs[4], hdr, stat; |
40cbfc37 AK |
817 | struct virtio_net_ctrl_hdr ctrl; |
818 | virtio_net_ctrl_ack status = ~0; | |
f7bc9594 | 819 | unsigned out_num = 0, in_num = 0, tmp; |
40cbfc37 AK |
820 | |
821 | /* Caller should know better */ | |
f7bc9594 | 822 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 AK |
823 | |
824 | ctrl.class = class; | |
825 | ctrl.cmd = cmd; | |
f7bc9594 RR |
826 | /* Add header */ |
827 | sg_init_one(&hdr, &ctrl, sizeof(ctrl)); | |
828 | sgs[out_num++] = &hdr; | |
40cbfc37 | 829 | |
f7bc9594 RR |
830 | if (out) |
831 | sgs[out_num++] = out; | |
832 | if (in) | |
833 | sgs[out_num + in_num++] = in; | |
40cbfc37 | 834 | |
f7bc9594 RR |
835 | /* Add return status. */ |
836 | sg_init_one(&stat, &status, sizeof(status)); | |
837 | sgs[out_num + in_num++] = &stat; | |
40cbfc37 | 838 | |
f7bc9594 RR |
839 | BUG_ON(out_num + in_num > ARRAY_SIZE(sgs)); |
840 | BUG_ON(virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC) | |
841 | < 0); | |
40cbfc37 AK |
842 | |
843 | virtqueue_kick(vi->cvq); | |
844 | ||
845 | /* Spin for a response, the kick causes an ioport write, trapping | |
846 | * into the hypervisor, so the request should be handled immediately. | |
847 | */ | |
848 | while (!virtqueue_get_buf(vi->cvq, &tmp)) | |
849 | cpu_relax(); | |
850 | ||
851 | return status == VIRTIO_NET_OK; | |
852 | } | |
853 | ||
9c46f6d4 AW |
854 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
855 | { | |
856 | struct virtnet_info *vi = netdev_priv(dev); | |
857 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 858 | int ret; |
7e58d5ae AK |
859 | struct sockaddr *addr = p; |
860 | struct scatterlist sg; | |
9c46f6d4 | 861 | |
7e58d5ae | 862 | ret = eth_prepare_mac_addr_change(dev, p); |
f2f2c8b4 JP |
863 | if (ret) |
864 | return ret; | |
9c46f6d4 | 865 | |
7e58d5ae AK |
866 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
867 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
868 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
869 | VIRTIO_NET_CTRL_MAC_ADDR_SET, | |
f7bc9594 | 870 | &sg, NULL)) { |
7e58d5ae AK |
871 | dev_warn(&vdev->dev, |
872 | "Failed to set mac address by vq command.\n"); | |
873 | return -EINVAL; | |
874 | } | |
875 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { | |
62994b2d | 876 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), |
7e58d5ae AK |
877 | addr->sa_data, dev->addr_len); |
878 | } | |
879 | ||
880 | eth_commit_mac_addr_change(dev, p); | |
9c46f6d4 AW |
881 | |
882 | return 0; | |
883 | } | |
884 | ||
3fa2a1df | 885 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
886 | struct rtnl_link_stats64 *tot) | |
887 | { | |
888 | struct virtnet_info *vi = netdev_priv(dev); | |
889 | int cpu; | |
890 | unsigned int start; | |
891 | ||
892 | for_each_possible_cpu(cpu) { | |
58472a76 | 893 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 894 | u64 tpackets, tbytes, rpackets, rbytes; |
895 | ||
896 | do { | |
e3906486 | 897 | start = u64_stats_fetch_begin_bh(&stats->tx_syncp); |
3fa2a1df | 898 | tpackets = stats->tx_packets; |
899 | tbytes = stats->tx_bytes; | |
e3906486 | 900 | } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start)); |
83a27052 ED |
901 | |
902 | do { | |
e3906486 | 903 | start = u64_stats_fetch_begin_bh(&stats->rx_syncp); |
3fa2a1df | 904 | rpackets = stats->rx_packets; |
905 | rbytes = stats->rx_bytes; | |
e3906486 | 906 | } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start)); |
3fa2a1df | 907 | |
908 | tot->rx_packets += rpackets; | |
909 | tot->tx_packets += tpackets; | |
910 | tot->rx_bytes += rbytes; | |
911 | tot->tx_bytes += tbytes; | |
912 | } | |
913 | ||
914 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 915 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 916 | tot->rx_dropped = dev->stats.rx_dropped; |
917 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
918 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
919 | ||
920 | return tot; | |
921 | } | |
922 | ||
da74e89d AS |
923 | #ifdef CONFIG_NET_POLL_CONTROLLER |
924 | static void virtnet_netpoll(struct net_device *dev) | |
925 | { | |
926 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 927 | int i; |
da74e89d | 928 | |
986a4f4d JW |
929 | for (i = 0; i < vi->curr_queue_pairs; i++) |
930 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
931 | } |
932 | #endif | |
933 | ||
586d17c5 JW |
934 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
935 | { | |
936 | rtnl_lock(); | |
937 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
f7bc9594 | 938 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, NULL)) |
586d17c5 JW |
939 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
940 | rtnl_unlock(); | |
941 | } | |
942 | ||
986a4f4d JW |
943 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
944 | { | |
945 | struct scatterlist sg; | |
946 | struct virtio_net_ctrl_mq s; | |
947 | struct net_device *dev = vi->dev; | |
948 | ||
949 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
950 | return 0; | |
951 | ||
952 | s.virtqueue_pairs = queue_pairs; | |
953 | sg_init_one(&sg, &s, sizeof(s)); | |
954 | ||
955 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
f7bc9594 | 956 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, NULL)) { |
986a4f4d JW |
957 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
958 | queue_pairs); | |
959 | return -EINVAL; | |
55257d72 | 960 | } else { |
986a4f4d | 961 | vi->curr_queue_pairs = queue_pairs; |
30983d3c JW |
962 | /* virtnet_open() will refill when device is going to up. */ |
963 | if (dev->flags & IFF_UP) | |
964 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 965 | } |
986a4f4d JW |
966 | |
967 | return 0; | |
968 | } | |
969 | ||
296f96fc RR |
970 | static int virtnet_close(struct net_device *dev) |
971 | { | |
972 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 973 | int i; |
296f96fc | 974 | |
b2baed69 RR |
975 | /* Make sure refill_work doesn't re-enable napi! */ |
976 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d JW |
977 | |
978 | for (i = 0; i < vi->max_queue_pairs; i++) | |
979 | napi_disable(&vi->rq[i].napi); | |
296f96fc | 980 | |
296f96fc RR |
981 | return 0; |
982 | } | |
983 | ||
2af7698e AW |
984 | static void virtnet_set_rx_mode(struct net_device *dev) |
985 | { | |
986 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 987 | struct scatterlist sg[2]; |
2af7698e | 988 | u8 promisc, allmulti; |
f565a7c2 | 989 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 990 | struct netdev_hw_addr *ha; |
32e7bfc4 | 991 | int uc_count; |
4cd24eaf | 992 | int mc_count; |
f565a7c2 AW |
993 | void *buf; |
994 | int i; | |
2af7698e AW |
995 | |
996 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
997 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
998 | return; | |
999 | ||
f565a7c2 AW |
1000 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
1001 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1002 | |
23e258e1 | 1003 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
1004 | |
1005 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
1006 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f7bc9594 | 1007 | sg, NULL)) |
2af7698e AW |
1008 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
1009 | promisc ? "en" : "dis"); | |
1010 | ||
23e258e1 | 1011 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
1012 | |
1013 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
1014 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f7bc9594 | 1015 | sg, NULL)) |
2af7698e AW |
1016 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
1017 | allmulti ? "en" : "dis"); | |
f565a7c2 | 1018 | |
32e7bfc4 | 1019 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1020 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1021 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1022 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1023 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1024 | mac_data = buf; | |
e68ed8f0 | 1025 | if (!buf) |
f565a7c2 | 1026 | return; |
f565a7c2 | 1027 | |
23e258e1 AW |
1028 | sg_init_table(sg, 2); |
1029 | ||
f565a7c2 | 1030 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 1031 | mac_data->entries = uc_count; |
ccffad25 | 1032 | i = 0; |
32e7bfc4 | 1033 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1034 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1035 | |
1036 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1037 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1038 | |
1039 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1040 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1041 | |
4cd24eaf | 1042 | mac_data->entries = mc_count; |
567ec874 | 1043 | i = 0; |
22bedad3 JP |
1044 | netdev_for_each_mc_addr(ha, dev) |
1045 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1046 | |
1047 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1048 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1049 | |
1050 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
1051 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
f7bc9594 | 1052 | sg, NULL)) |
f565a7c2 AW |
1053 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); |
1054 | ||
1055 | kfree(buf); | |
2af7698e AW |
1056 | } |
1057 | ||
80d5c368 PM |
1058 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
1059 | __be16 proto, u16 vid) | |
0bde9569 AW |
1060 | { |
1061 | struct virtnet_info *vi = netdev_priv(dev); | |
1062 | struct scatterlist sg; | |
1063 | ||
23e258e1 | 1064 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1065 | |
1066 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
f7bc9594 | 1067 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, NULL)) |
0bde9569 | 1068 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1069 | return 0; |
0bde9569 AW |
1070 | } |
1071 | ||
80d5c368 PM |
1072 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1073 | __be16 proto, u16 vid) | |
0bde9569 AW |
1074 | { |
1075 | struct virtnet_info *vi = netdev_priv(dev); | |
1076 | struct scatterlist sg; | |
1077 | ||
23e258e1 | 1078 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1079 | |
1080 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
f7bc9594 | 1081 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, NULL)) |
0bde9569 | 1082 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1083 | return 0; |
0bde9569 AW |
1084 | } |
1085 | ||
8898c21c | 1086 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
986a4f4d JW |
1087 | { |
1088 | int i; | |
47be2479 | 1089 | int cpu; |
986a4f4d | 1090 | |
8898c21c WG |
1091 | if (vi->affinity_hint_set) { |
1092 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
47be2479 WG |
1093 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
1094 | virtqueue_set_affinity(vi->sq[i].vq, -1); | |
1095 | } | |
1096 | ||
8898c21c WG |
1097 | vi->affinity_hint_set = false; |
1098 | } | |
1099 | ||
1100 | i = 0; | |
1101 | for_each_online_cpu(cpu) { | |
1102 | if (cpu == hcpu) { | |
1103 | *per_cpu_ptr(vi->vq_index, cpu) = -1; | |
1104 | } else { | |
47be2479 WG |
1105 | *per_cpu_ptr(vi->vq_index, cpu) = |
1106 | ++i % vi->curr_queue_pairs; | |
8898c21c WG |
1107 | } |
1108 | } | |
1109 | } | |
47be2479 | 1110 | |
8898c21c WG |
1111 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1112 | { | |
1113 | int i; | |
1114 | int cpu; | |
986a4f4d JW |
1115 | |
1116 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1117 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1118 | * setting the affinity hint to eliminate the contention. | |
1119 | */ | |
8898c21c WG |
1120 | if (vi->curr_queue_pairs == 1 || |
1121 | vi->max_queue_pairs != num_online_cpus()) { | |
1122 | virtnet_clean_affinity(vi, -1); | |
1123 | return; | |
986a4f4d JW |
1124 | } |
1125 | ||
8898c21c WG |
1126 | i = 0; |
1127 | for_each_online_cpu(cpu) { | |
986a4f4d JW |
1128 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
1129 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
8898c21c WG |
1130 | *per_cpu_ptr(vi->vq_index, cpu) = i; |
1131 | i++; | |
986a4f4d JW |
1132 | } |
1133 | ||
8898c21c | 1134 | vi->affinity_hint_set = true; |
986a4f4d JW |
1135 | } |
1136 | ||
8de4b2f3 WG |
1137 | static int virtnet_cpu_callback(struct notifier_block *nfb, |
1138 | unsigned long action, void *hcpu) | |
1139 | { | |
1140 | struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); | |
1141 | ||
1142 | switch(action & ~CPU_TASKS_FROZEN) { | |
1143 | case CPU_ONLINE: | |
1144 | case CPU_DOWN_FAILED: | |
1145 | case CPU_DEAD: | |
1146 | virtnet_set_affinity(vi); | |
1147 | break; | |
1148 | case CPU_DOWN_PREPARE: | |
1149 | virtnet_clean_affinity(vi, (long)hcpu); | |
1150 | break; | |
1151 | default: | |
1152 | break; | |
1153 | } | |
f0272171 | 1154 | |
8de4b2f3 | 1155 | return NOTIFY_OK; |
986a4f4d JW |
1156 | } |
1157 | ||
8f9f4668 RJ |
1158 | static void virtnet_get_ringparam(struct net_device *dev, |
1159 | struct ethtool_ringparam *ring) | |
1160 | { | |
1161 | struct virtnet_info *vi = netdev_priv(dev); | |
1162 | ||
986a4f4d JW |
1163 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1164 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1165 | ring->rx_pending = ring->rx_max_pending; |
1166 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1167 | } |
1168 | ||
66846048 RJ |
1169 | |
1170 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1171 | struct ethtool_drvinfo *info) | |
1172 | { | |
1173 | struct virtnet_info *vi = netdev_priv(dev); | |
1174 | struct virtio_device *vdev = vi->vdev; | |
1175 | ||
1176 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1177 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1178 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1179 | ||
1180 | } | |
1181 | ||
d73bcd2c JW |
1182 | /* TODO: Eliminate OOO packets during switching */ |
1183 | static int virtnet_set_channels(struct net_device *dev, | |
1184 | struct ethtool_channels *channels) | |
1185 | { | |
1186 | struct virtnet_info *vi = netdev_priv(dev); | |
1187 | u16 queue_pairs = channels->combined_count; | |
1188 | int err; | |
1189 | ||
1190 | /* We don't support separate rx/tx channels. | |
1191 | * We don't allow setting 'other' channels. | |
1192 | */ | |
1193 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1194 | return -EINVAL; | |
1195 | ||
1196 | if (queue_pairs > vi->max_queue_pairs) | |
1197 | return -EINVAL; | |
1198 | ||
47be2479 | 1199 | get_online_cpus(); |
d73bcd2c JW |
1200 | err = virtnet_set_queues(vi, queue_pairs); |
1201 | if (!err) { | |
1202 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1203 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1204 | ||
8898c21c | 1205 | virtnet_set_affinity(vi); |
d73bcd2c | 1206 | } |
47be2479 | 1207 | put_online_cpus(); |
d73bcd2c JW |
1208 | |
1209 | return err; | |
1210 | } | |
1211 | ||
1212 | static void virtnet_get_channels(struct net_device *dev, | |
1213 | struct ethtool_channels *channels) | |
1214 | { | |
1215 | struct virtnet_info *vi = netdev_priv(dev); | |
1216 | ||
1217 | channels->combined_count = vi->curr_queue_pairs; | |
1218 | channels->max_combined = vi->max_queue_pairs; | |
1219 | channels->max_other = 0; | |
1220 | channels->rx_count = 0; | |
1221 | channels->tx_count = 0; | |
1222 | channels->other_count = 0; | |
1223 | } | |
1224 | ||
0fc0b732 | 1225 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1226 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1227 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1228 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1229 | .set_channels = virtnet_set_channels, |
1230 | .get_channels = virtnet_get_channels, | |
a9ea3fc6 HX |
1231 | }; |
1232 | ||
39da5814 MM |
1233 | #define MIN_MTU 68 |
1234 | #define MAX_MTU 65535 | |
1235 | ||
1236 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
1237 | { | |
1238 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
1239 | return -EINVAL; | |
1240 | dev->mtu = new_mtu; | |
1241 | return 0; | |
1242 | } | |
1243 | ||
986a4f4d JW |
1244 | /* To avoid contending a lock hold by a vcpu who would exit to host, select the |
1245 | * txq based on the processor id. | |
986a4f4d JW |
1246 | */ |
1247 | static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb) | |
1248 | { | |
47be2479 WG |
1249 | int txq; |
1250 | struct virtnet_info *vi = netdev_priv(dev); | |
1251 | ||
1252 | if (skb_rx_queue_recorded(skb)) { | |
1253 | txq = skb_get_rx_queue(skb); | |
1254 | } else { | |
1255 | txq = *__this_cpu_ptr(vi->vq_index); | |
1256 | if (txq == -1) | |
1257 | txq = 0; | |
1258 | } | |
986a4f4d JW |
1259 | |
1260 | while (unlikely(txq >= dev->real_num_tx_queues)) | |
1261 | txq -= dev->real_num_tx_queues; | |
1262 | ||
1263 | return txq; | |
1264 | } | |
1265 | ||
76288b4e SH |
1266 | static const struct net_device_ops virtnet_netdev = { |
1267 | .ndo_open = virtnet_open, | |
1268 | .ndo_stop = virtnet_close, | |
1269 | .ndo_start_xmit = start_xmit, | |
1270 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1271 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1272 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 1273 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 1274 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1275 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1276 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
986a4f4d | 1277 | .ndo_select_queue = virtnet_select_queue, |
76288b4e SH |
1278 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1279 | .ndo_poll_controller = virtnet_netpoll, | |
1280 | #endif | |
1281 | }; | |
1282 | ||
586d17c5 | 1283 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1284 | { |
586d17c5 JW |
1285 | struct virtnet_info *vi = |
1286 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1287 | u16 v; |
1288 | ||
586d17c5 JW |
1289 | mutex_lock(&vi->config_lock); |
1290 | if (!vi->config_enable) | |
1291 | goto done; | |
1292 | ||
77dd7693 | 1293 | if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS, |
9f4d26d0 | 1294 | offsetof(struct virtio_net_config, status), |
77dd7693 | 1295 | &v) < 0) |
586d17c5 JW |
1296 | goto done; |
1297 | ||
1298 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1299 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1300 | virtnet_ack_link_announce(vi); |
1301 | } | |
9f4d26d0 MM |
1302 | |
1303 | /* Ignore unknown (future) status bits */ | |
1304 | v &= VIRTIO_NET_S_LINK_UP; | |
1305 | ||
1306 | if (vi->status == v) | |
586d17c5 | 1307 | goto done; |
9f4d26d0 MM |
1308 | |
1309 | vi->status = v; | |
1310 | ||
1311 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1312 | netif_carrier_on(vi->dev); | |
986a4f4d | 1313 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
1314 | } else { |
1315 | netif_carrier_off(vi->dev); | |
986a4f4d | 1316 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 | 1317 | } |
586d17c5 JW |
1318 | done: |
1319 | mutex_unlock(&vi->config_lock); | |
9f4d26d0 MM |
1320 | } |
1321 | ||
1322 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1323 | { | |
1324 | struct virtnet_info *vi = vdev->priv; | |
1325 | ||
3b07e9ca | 1326 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1327 | } |
1328 | ||
986a4f4d JW |
1329 | static void virtnet_free_queues(struct virtnet_info *vi) |
1330 | { | |
4ea85d9e AV |
1331 | int i; |
1332 | ||
1333 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1334 | netif_napi_del(&vi->rq[i].napi); | |
1335 | ||
986a4f4d JW |
1336 | kfree(vi->rq); |
1337 | kfree(vi->sq); | |
1338 | } | |
1339 | ||
1340 | static void free_receive_bufs(struct virtnet_info *vi) | |
1341 | { | |
1342 | int i; | |
1343 | ||
1344 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1345 | while (vi->rq[i].pages) | |
1346 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | static void free_unused_bufs(struct virtnet_info *vi) | |
1351 | { | |
1352 | void *buf; | |
1353 | int i; | |
1354 | ||
1355 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1356 | struct virtqueue *vq = vi->sq[i].vq; | |
1357 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) | |
1358 | dev_kfree_skb(buf); | |
1359 | } | |
1360 | ||
1361 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1362 | struct virtqueue *vq = vi->rq[i].vq; | |
1363 | ||
1364 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
1365 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
1366 | give_pages(&vi->rq[i], buf); | |
1367 | else | |
1368 | dev_kfree_skb(buf); | |
1369 | --vi->rq[i].num; | |
1370 | } | |
1371 | BUG_ON(vi->rq[i].num != 0); | |
1372 | } | |
1373 | } | |
1374 | ||
e9d7417b JW |
1375 | static void virtnet_del_vqs(struct virtnet_info *vi) |
1376 | { | |
1377 | struct virtio_device *vdev = vi->vdev; | |
1378 | ||
8898c21c | 1379 | virtnet_clean_affinity(vi, -1); |
986a4f4d | 1380 | |
e9d7417b | 1381 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
1382 | |
1383 | virtnet_free_queues(vi); | |
e9d7417b JW |
1384 | } |
1385 | ||
986a4f4d | 1386 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 1387 | { |
986a4f4d JW |
1388 | vq_callback_t **callbacks; |
1389 | struct virtqueue **vqs; | |
1390 | int ret = -ENOMEM; | |
1391 | int i, total_vqs; | |
1392 | const char **names; | |
1393 | ||
1394 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
1395 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
1396 | * possible control vq. | |
1397 | */ | |
1398 | total_vqs = vi->max_queue_pairs * 2 + | |
1399 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
1400 | ||
1401 | /* Allocate space for find_vqs parameters */ | |
1402 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
1403 | if (!vqs) | |
1404 | goto err_vq; | |
1405 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
1406 | if (!callbacks) | |
1407 | goto err_callback; | |
1408 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
1409 | if (!names) | |
1410 | goto err_names; | |
1411 | ||
1412 | /* Parameters for control virtqueue, if any */ | |
1413 | if (vi->has_cvq) { | |
1414 | callbacks[total_vqs - 1] = NULL; | |
1415 | names[total_vqs - 1] = "control"; | |
1416 | } | |
3f9c10b0 | 1417 | |
986a4f4d JW |
1418 | /* Allocate/initialize parameters for send/receive virtqueues */ |
1419 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1420 | callbacks[rxq2vq(i)] = skb_recv_done; | |
1421 | callbacks[txq2vq(i)] = skb_xmit_done; | |
1422 | sprintf(vi->rq[i].name, "input.%d", i); | |
1423 | sprintf(vi->sq[i].name, "output.%d", i); | |
1424 | names[rxq2vq(i)] = vi->rq[i].name; | |
1425 | names[txq2vq(i)] = vi->sq[i].name; | |
1426 | } | |
3f9c10b0 | 1427 | |
986a4f4d JW |
1428 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
1429 | names); | |
1430 | if (ret) | |
1431 | goto err_find; | |
3f9c10b0 | 1432 | |
986a4f4d JW |
1433 | if (vi->has_cvq) { |
1434 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 1435 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 1436 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 1437 | } |
986a4f4d JW |
1438 | |
1439 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1440 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
1441 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
1442 | } | |
1443 | ||
1444 | kfree(names); | |
1445 | kfree(callbacks); | |
1446 | kfree(vqs); | |
1447 | ||
3f9c10b0 | 1448 | return 0; |
986a4f4d JW |
1449 | |
1450 | err_find: | |
1451 | kfree(names); | |
1452 | err_names: | |
1453 | kfree(callbacks); | |
1454 | err_callback: | |
1455 | kfree(vqs); | |
1456 | err_vq: | |
1457 | return ret; | |
1458 | } | |
1459 | ||
1460 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
1461 | { | |
1462 | int i; | |
1463 | ||
1464 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
1465 | if (!vi->sq) | |
1466 | goto err_sq; | |
1467 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 1468 | if (!vi->rq) |
986a4f4d JW |
1469 | goto err_rq; |
1470 | ||
1471 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
1472 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1473 | vi->rq[i].pages = NULL; | |
1474 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
1475 | napi_weight); | |
1476 | ||
1477 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
1478 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); | |
1479 | } | |
1480 | ||
1481 | return 0; | |
1482 | ||
1483 | err_rq: | |
1484 | kfree(vi->sq); | |
1485 | err_sq: | |
1486 | return -ENOMEM; | |
1487 | } | |
1488 | ||
1489 | static int init_vqs(struct virtnet_info *vi) | |
1490 | { | |
1491 | int ret; | |
1492 | ||
1493 | /* Allocate send & receive queues */ | |
1494 | ret = virtnet_alloc_queues(vi); | |
1495 | if (ret) | |
1496 | goto err; | |
1497 | ||
1498 | ret = virtnet_find_vqs(vi); | |
1499 | if (ret) | |
1500 | goto err_free; | |
1501 | ||
47be2479 | 1502 | get_online_cpus(); |
8898c21c | 1503 | virtnet_set_affinity(vi); |
47be2479 WG |
1504 | put_online_cpus(); |
1505 | ||
986a4f4d JW |
1506 | return 0; |
1507 | ||
1508 | err_free: | |
1509 | virtnet_free_queues(vi); | |
1510 | err: | |
1511 | return ret; | |
3f9c10b0 AS |
1512 | } |
1513 | ||
296f96fc RR |
1514 | static int virtnet_probe(struct virtio_device *vdev) |
1515 | { | |
986a4f4d | 1516 | int i, err; |
296f96fc RR |
1517 | struct net_device *dev; |
1518 | struct virtnet_info *vi; | |
986a4f4d JW |
1519 | u16 max_queue_pairs; |
1520 | ||
1521 | /* Find if host supports multiqueue virtio_net device */ | |
1522 | err = virtio_config_val(vdev, VIRTIO_NET_F_MQ, | |
1523 | offsetof(struct virtio_net_config, | |
1524 | max_virtqueue_pairs), &max_queue_pairs); | |
1525 | ||
1526 | /* We need at least 2 queue's */ | |
1527 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
1528 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
1529 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
1530 | max_queue_pairs = 1; | |
296f96fc RR |
1531 | |
1532 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 1533 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
1534 | if (!dev) |
1535 | return -ENOMEM; | |
1536 | ||
1537 | /* Set up network device as normal. */ | |
f2f2c8b4 | 1538 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 1539 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1540 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1541 | |
a9ea3fc6 | 1542 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
1543 | SET_NETDEV_DEV(dev, &vdev->dev); |
1544 | ||
1545 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1546 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1547 | /* This opens up the world of extra features. */ |
98e778c9 MM |
1548 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
1549 | if (csum) | |
1550 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1551 | ||
1552 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
1553 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO | |
34a48579 RR |
1554 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1555 | } | |
5539ae96 | 1556 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1557 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1558 | dev->hw_features |= NETIF_F_TSO; | |
1559 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1560 | dev->hw_features |= NETIF_F_TSO6; | |
1561 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1562 | dev->hw_features |= NETIF_F_TSO_ECN; | |
1563 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) | |
1564 | dev->hw_features |= NETIF_F_UFO; | |
1565 | ||
1566 | if (gso) | |
1567 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); | |
1568 | /* (!csum && gso) case will be fixed by register_netdev() */ | |
296f96fc RR |
1569 | } |
1570 | ||
4fda8302 JW |
1571 | dev->vlan_features = dev->features; |
1572 | ||
296f96fc | 1573 | /* Configuration may specify what MAC to use. Otherwise random. */ |
77dd7693 | 1574 | if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC, |
a586d4f6 | 1575 | offsetof(struct virtio_net_config, mac), |
77dd7693 | 1576 | dev->dev_addr, dev->addr_len) < 0) |
f2cedb63 | 1577 | eth_hw_addr_random(dev); |
296f96fc RR |
1578 | |
1579 | /* Set up our device-specific information */ | |
1580 | vi = netdev_priv(dev); | |
296f96fc RR |
1581 | vi->dev = dev; |
1582 | vi->vdev = vdev; | |
d9d5dcc8 | 1583 | vdev->priv = vi; |
3fa2a1df | 1584 | vi->stats = alloc_percpu(struct virtnet_stats); |
1585 | err = -ENOMEM; | |
1586 | if (vi->stats == NULL) | |
1587 | goto free; | |
1588 | ||
47be2479 WG |
1589 | vi->vq_index = alloc_percpu(int); |
1590 | if (vi->vq_index == NULL) | |
1591 | goto free_stats; | |
1592 | ||
586d17c5 JW |
1593 | mutex_init(&vi->config_lock); |
1594 | vi->config_enable = true; | |
1595 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); | |
296f96fc | 1596 | |
97402b96 | 1597 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1598 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1599 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
73c99258 JW |
1600 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
1601 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) | |
97402b96 HX |
1602 | vi->big_packets = true; |
1603 | ||
3f2c31d9 MM |
1604 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1605 | vi->mergeable_rx_bufs = true; | |
1606 | ||
986a4f4d JW |
1607 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
1608 | vi->has_cvq = true; | |
1609 | ||
1610 | /* Use single tx/rx queue pair as default */ | |
1611 | vi->curr_queue_pairs = 1; | |
1612 | vi->max_queue_pairs = max_queue_pairs; | |
1613 | ||
1614 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 1615 | err = init_vqs(vi); |
d2a7ddda | 1616 | if (err) |
47be2479 | 1617 | goto free_index; |
296f96fc | 1618 | |
986a4f4d JW |
1619 | netif_set_real_num_tx_queues(dev, 1); |
1620 | netif_set_real_num_rx_queues(dev, 1); | |
1621 | ||
296f96fc RR |
1622 | err = register_netdev(dev); |
1623 | if (err) { | |
1624 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1625 | goto free_vqs; |
296f96fc | 1626 | } |
b3369c1f RR |
1627 | |
1628 | /* Last of all, set up some receive buffers. */ | |
55257d72 | 1629 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d JW |
1630 | try_fill_recv(&vi->rq[i], GFP_KERNEL); |
1631 | ||
1632 | /* If we didn't even get one input buffer, we're useless. */ | |
1633 | if (vi->rq[i].num == 0) { | |
1634 | free_unused_bufs(vi); | |
1635 | err = -ENOMEM; | |
1636 | goto free_recv_bufs; | |
1637 | } | |
b3369c1f RR |
1638 | } |
1639 | ||
8de4b2f3 WG |
1640 | vi->nb.notifier_call = &virtnet_cpu_callback; |
1641 | err = register_hotcpu_notifier(&vi->nb); | |
1642 | if (err) { | |
1643 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
1644 | goto free_recv_bufs; | |
1645 | } | |
1646 | ||
167c25e4 JW |
1647 | /* Assume link up if device can't report link status, |
1648 | otherwise get link status from config. */ | |
1649 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1650 | netif_carrier_off(dev); | |
3b07e9ca | 1651 | schedule_work(&vi->config_work); |
167c25e4 JW |
1652 | } else { |
1653 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1654 | netif_carrier_on(dev); | |
1655 | } | |
9f4d26d0 | 1656 | |
986a4f4d JW |
1657 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
1658 | dev->name, max_queue_pairs); | |
1659 | ||
296f96fc RR |
1660 | return 0; |
1661 | ||
986a4f4d JW |
1662 | free_recv_bufs: |
1663 | free_receive_bufs(vi); | |
b3369c1f | 1664 | unregister_netdev(dev); |
d2a7ddda | 1665 | free_vqs: |
986a4f4d | 1666 | cancel_delayed_work_sync(&vi->refill); |
e9d7417b | 1667 | virtnet_del_vqs(vi); |
47be2479 WG |
1668 | free_index: |
1669 | free_percpu(vi->vq_index); | |
3fa2a1df | 1670 | free_stats: |
1671 | free_percpu(vi->stats); | |
296f96fc RR |
1672 | free: |
1673 | free_netdev(dev); | |
1674 | return err; | |
1675 | } | |
1676 | ||
04486ed0 | 1677 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1678 | { |
04486ed0 | 1679 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1680 | |
1681 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1682 | free_unused_bufs(vi); |
fb6813f4 | 1683 | |
986a4f4d | 1684 | free_receive_bufs(vi); |
d2a7ddda | 1685 | |
986a4f4d | 1686 | virtnet_del_vqs(vi); |
04486ed0 AS |
1687 | } |
1688 | ||
8cc085d6 | 1689 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
1690 | { |
1691 | struct virtnet_info *vi = vdev->priv; | |
1692 | ||
8de4b2f3 WG |
1693 | unregister_hotcpu_notifier(&vi->nb); |
1694 | ||
586d17c5 JW |
1695 | /* Prevent config work handler from accessing the device. */ |
1696 | mutex_lock(&vi->config_lock); | |
1697 | vi->config_enable = false; | |
1698 | mutex_unlock(&vi->config_lock); | |
1699 | ||
04486ed0 AS |
1700 | unregister_netdev(vi->dev); |
1701 | ||
1702 | remove_vq_common(vi); | |
fb6813f4 | 1703 | |
586d17c5 JW |
1704 | flush_work(&vi->config_work); |
1705 | ||
47be2479 | 1706 | free_percpu(vi->vq_index); |
2e66f55b | 1707 | free_percpu(vi->stats); |
74b2553f | 1708 | free_netdev(vi->dev); |
296f96fc RR |
1709 | } |
1710 | ||
0741bcb5 AS |
1711 | #ifdef CONFIG_PM |
1712 | static int virtnet_freeze(struct virtio_device *vdev) | |
1713 | { | |
1714 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1715 | int i; |
0741bcb5 | 1716 | |
69ce0106 JW |
1717 | unregister_hotcpu_notifier(&vi->nb); |
1718 | ||
586d17c5 JW |
1719 | /* Prevent config work handler from accessing the device */ |
1720 | mutex_lock(&vi->config_lock); | |
1721 | vi->config_enable = false; | |
1722 | mutex_unlock(&vi->config_lock); | |
1723 | ||
0741bcb5 AS |
1724 | netif_device_detach(vi->dev); |
1725 | cancel_delayed_work_sync(&vi->refill); | |
1726 | ||
1727 | if (netif_running(vi->dev)) | |
986a4f4d JW |
1728 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1729 | napi_disable(&vi->rq[i].napi); | |
1730 | netif_napi_del(&vi->rq[i].napi); | |
1731 | } | |
0741bcb5 AS |
1732 | |
1733 | remove_vq_common(vi); | |
1734 | ||
586d17c5 JW |
1735 | flush_work(&vi->config_work); |
1736 | ||
0741bcb5 AS |
1737 | return 0; |
1738 | } | |
1739 | ||
1740 | static int virtnet_restore(struct virtio_device *vdev) | |
1741 | { | |
1742 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1743 | int err, i; |
0741bcb5 AS |
1744 | |
1745 | err = init_vqs(vi); | |
1746 | if (err) | |
1747 | return err; | |
1748 | ||
6a0827c4 JW |
1749 | if (netif_running(vi->dev)) { |
1750 | for (i = 0; i < vi->curr_queue_pairs; i++) | |
1751 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
1752 | schedule_delayed_work(&vi->refill, 0); | |
1753 | ||
986a4f4d JW |
1754 | for (i = 0; i < vi->max_queue_pairs; i++) |
1755 | virtnet_napi_enable(&vi->rq[i]); | |
6a0827c4 | 1756 | } |
0741bcb5 AS |
1757 | |
1758 | netif_device_attach(vi->dev); | |
1759 | ||
586d17c5 JW |
1760 | mutex_lock(&vi->config_lock); |
1761 | vi->config_enable = true; | |
1762 | mutex_unlock(&vi->config_lock); | |
1763 | ||
30983d3c | 1764 | rtnl_lock(); |
986a4f4d | 1765 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
30983d3c | 1766 | rtnl_unlock(); |
986a4f4d | 1767 | |
69ce0106 JW |
1768 | err = register_hotcpu_notifier(&vi->nb); |
1769 | if (err) | |
1770 | return err; | |
1771 | ||
0741bcb5 AS |
1772 | return 0; |
1773 | } | |
1774 | #endif | |
1775 | ||
296f96fc RR |
1776 | static struct virtio_device_id id_table[] = { |
1777 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1778 | { 0 }, | |
1779 | }; | |
1780 | ||
c45a6816 | 1781 | static unsigned int features[] = { |
5e4fe5c4 MM |
1782 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1783 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1784 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1785 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1786 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1787 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1788 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
986a4f4d | 1789 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, |
7e58d5ae | 1790 | VIRTIO_NET_F_CTRL_MAC_ADDR, |
c45a6816 RR |
1791 | }; |
1792 | ||
22402529 | 1793 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1794 | .feature_table = features, |
1795 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1796 | .driver.name = KBUILD_MODNAME, |
1797 | .driver.owner = THIS_MODULE, | |
1798 | .id_table = id_table, | |
1799 | .probe = virtnet_probe, | |
8cc085d6 | 1800 | .remove = virtnet_remove, |
9f4d26d0 | 1801 | .config_changed = virtnet_config_changed, |
0741bcb5 AS |
1802 | #ifdef CONFIG_PM |
1803 | .freeze = virtnet_freeze, | |
1804 | .restore = virtnet_restore, | |
1805 | #endif | |
296f96fc RR |
1806 | }; |
1807 | ||
b2a17029 | 1808 | module_virtio_driver(virtio_net_driver); |
296f96fc RR |
1809 | |
1810 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1811 | MODULE_DESCRIPTION("Virtio network driver"); | |
1812 | MODULE_LICENSE("GPL"); |