Commit | Line | Data |
---|---|---|
48925e37 | 1 | /* A network driver using virtio. |
296f96fc RR |
2 | * |
3 | * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | //#define DEBUG | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 22 | #include <linux/ethtool.h> |
296f96fc RR |
23 | #include <linux/module.h> |
24 | #include <linux/virtio.h> | |
25 | #include <linux/virtio_net.h> | |
26 | #include <linux/scatterlist.h> | |
e918085a | 27 | #include <linux/if_vlan.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
296f96fc | 29 | |
6c0cd7c0 DL |
30 | static int napi_weight = 128; |
31 | module_param(napi_weight, int, 0444); | |
32 | ||
eb939922 | 33 | static bool csum = true, gso = true; |
34a48579 RR |
34 | module_param(csum, bool, 0444); |
35 | module_param(gso, bool, 0444); | |
36 | ||
296f96fc | 37 | /* FIXME: MTU in config. */ |
e918085a | 38 | #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 39 | #define GOOD_COPY_LEN 128 |
296f96fc | 40 | |
f565a7c2 | 41 | #define VIRTNET_SEND_COMMAND_SG_MAX 2 |
66846048 | 42 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 43 | |
3fa2a1df | 44 | struct virtnet_stats { |
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; | |
296f96fc RR |
126 | }; |
127 | ||
b3f24698 RR |
128 | struct skb_vnet_hdr { |
129 | union { | |
130 | struct virtio_net_hdr hdr; | |
131 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
132 | }; | |
48925e37 | 133 | unsigned int num_sg; |
b3f24698 RR |
134 | }; |
135 | ||
9ab86bbc SM |
136 | struct padded_vnet_hdr { |
137 | struct virtio_net_hdr hdr; | |
138 | /* | |
139 | * virtio_net_hdr should be in a separated sg buffer because of a | |
140 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
141 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
142 | */ | |
143 | char padding[6]; | |
144 | }; | |
145 | ||
986a4f4d JW |
146 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
147 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
148 | */ | |
149 | static int vq2txq(struct virtqueue *vq) | |
150 | { | |
151 | return (virtqueue_get_queue_index(vq) - 1) / 2; | |
152 | } | |
153 | ||
154 | static int txq2vq(int txq) | |
155 | { | |
156 | return txq * 2 + 1; | |
157 | } | |
158 | ||
159 | static int vq2rxq(struct virtqueue *vq) | |
160 | { | |
161 | return virtqueue_get_queue_index(vq) / 2; | |
162 | } | |
163 | ||
164 | static int rxq2vq(int rxq) | |
165 | { | |
166 | return rxq * 2; | |
167 | } | |
168 | ||
b3f24698 | 169 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 170 | { |
b3f24698 | 171 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
172 | } |
173 | ||
9ab86bbc SM |
174 | /* |
175 | * private is used to chain pages for big packets, put the whole | |
176 | * most recent used list in the beginning for reuse | |
177 | */ | |
e9d7417b | 178 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 179 | { |
9ab86bbc | 180 | struct page *end; |
0a888fd1 | 181 | |
e9d7417b | 182 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 183 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
184 | end->private = (unsigned long)rq->pages; |
185 | rq->pages = page; | |
0a888fd1 MM |
186 | } |
187 | ||
e9d7417b | 188 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 189 | { |
e9d7417b | 190 | struct page *p = rq->pages; |
fb6813f4 | 191 | |
9ab86bbc | 192 | if (p) { |
e9d7417b | 193 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
194 | /* clear private here, it is used to chain pages */ |
195 | p->private = 0; | |
196 | } else | |
fb6813f4 RR |
197 | p = alloc_page(gfp_mask); |
198 | return p; | |
199 | } | |
200 | ||
e9d7417b | 201 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 202 | { |
e9d7417b | 203 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 204 | |
2cb9c6ba | 205 | /* Suppress further interrupts. */ |
e9d7417b | 206 | virtqueue_disable_cb(vq); |
11a3a154 | 207 | |
363f1514 | 208 | /* We were probably waiting for more output buffers. */ |
986a4f4d | 209 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
296f96fc RR |
210 | } |
211 | ||
9ab86bbc SM |
212 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
213 | unsigned int offset, unsigned int *len) | |
296f96fc | 214 | { |
8a59a7b9 | 215 | int size = min((unsigned)PAGE_SIZE - offset, *len); |
9ab86bbc | 216 | int i = skb_shinfo(skb)->nr_frags; |
9ab86bbc | 217 | |
8a59a7b9 | 218 | __skb_fill_page_desc(skb, i, page, offset, size); |
9ab86bbc | 219 | |
8a59a7b9 KK |
220 | skb->data_len += size; |
221 | skb->len += size; | |
4b727361 | 222 | skb->truesize += PAGE_SIZE; |
9ab86bbc | 223 | skb_shinfo(skb)->nr_frags++; |
8a59a7b9 | 224 | *len -= size; |
9ab86bbc | 225 | } |
23cde76d | 226 | |
3464645a | 227 | /* Called from bottom half context */ |
e9d7417b | 228 | static struct sk_buff *page_to_skb(struct receive_queue *rq, |
9ab86bbc SM |
229 | struct page *page, unsigned int len) |
230 | { | |
e9d7417b | 231 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc SM |
232 | struct sk_buff *skb; |
233 | struct skb_vnet_hdr *hdr; | |
234 | unsigned int copy, hdr_len, offset; | |
235 | char *p; | |
fb6813f4 | 236 | |
9ab86bbc | 237 | p = page_address(page); |
3f2c31d9 | 238 | |
9ab86bbc SM |
239 | /* copy small packet so we can reuse these pages for small data */ |
240 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
241 | if (unlikely(!skb)) | |
242 | return NULL; | |
3f2c31d9 | 243 | |
9ab86bbc | 244 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 245 | |
9ab86bbc SM |
246 | if (vi->mergeable_rx_bufs) { |
247 | hdr_len = sizeof hdr->mhdr; | |
248 | offset = hdr_len; | |
249 | } else { | |
250 | hdr_len = sizeof hdr->hdr; | |
251 | offset = sizeof(struct padded_vnet_hdr); | |
252 | } | |
3f2c31d9 | 253 | |
9ab86bbc | 254 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 255 | |
9ab86bbc SM |
256 | len -= hdr_len; |
257 | p += offset; | |
3f2c31d9 | 258 | |
9ab86bbc SM |
259 | copy = len; |
260 | if (copy > skb_tailroom(skb)) | |
261 | copy = skb_tailroom(skb); | |
262 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 263 | |
9ab86bbc SM |
264 | len -= copy; |
265 | offset += copy; | |
3f2c31d9 | 266 | |
e878d78b SL |
267 | /* |
268 | * Verify that we can indeed put this data into a skb. | |
269 | * This is here to handle cases when the device erroneously | |
270 | * tries to receive more than is possible. This is usually | |
271 | * the case of a broken device. | |
272 | */ | |
273 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 274 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
275 | dev_kfree_skb(skb); |
276 | return NULL; | |
277 | } | |
278 | ||
9ab86bbc SM |
279 | while (len) { |
280 | set_skb_frag(skb, page, offset, &len); | |
281 | page = (struct page *)page->private; | |
282 | offset = 0; | |
283 | } | |
3f2c31d9 | 284 | |
9ab86bbc | 285 | if (page) |
e9d7417b | 286 | give_pages(rq, page); |
3f2c31d9 | 287 | |
9ab86bbc SM |
288 | return skb; |
289 | } | |
3f2c31d9 | 290 | |
e9d7417b | 291 | static int receive_mergeable(struct receive_queue *rq, struct sk_buff *skb) |
9ab86bbc SM |
292 | { |
293 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); | |
294 | struct page *page; | |
295 | int num_buf, i, len; | |
296 | ||
297 | num_buf = hdr->mhdr.num_buffers; | |
298 | while (--num_buf) { | |
299 | i = skb_shinfo(skb)->nr_frags; | |
300 | if (i >= MAX_SKB_FRAGS) { | |
301 | pr_debug("%s: packet too long\n", skb->dev->name); | |
302 | skb->dev->stats.rx_length_errors++; | |
303 | return -EINVAL; | |
304 | } | |
e9d7417b | 305 | page = virtqueue_get_buf(rq->vq, &len); |
9ab86bbc SM |
306 | if (!page) { |
307 | pr_debug("%s: rx error: %d buffers missing\n", | |
308 | skb->dev->name, hdr->mhdr.num_buffers); | |
309 | skb->dev->stats.rx_length_errors++; | |
310 | return -EINVAL; | |
3f2c31d9 | 311 | } |
3fa2a1df | 312 | |
9ab86bbc SM |
313 | if (len > PAGE_SIZE) |
314 | len = PAGE_SIZE; | |
315 | ||
316 | set_skb_frag(skb, page, 0, &len); | |
317 | ||
e9d7417b | 318 | --rq->num; |
9ab86bbc SM |
319 | } |
320 | return 0; | |
321 | } | |
322 | ||
e9d7417b | 323 | static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) |
9ab86bbc | 324 | { |
e9d7417b JW |
325 | struct virtnet_info *vi = rq->vq->vdev->priv; |
326 | struct net_device *dev = vi->dev; | |
58472a76 | 327 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc SM |
328 | struct sk_buff *skb; |
329 | struct page *page; | |
330 | struct skb_vnet_hdr *hdr; | |
3f2c31d9 | 331 | |
9ab86bbc SM |
332 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
333 | pr_debug("%s: short packet %i\n", dev->name, len); | |
334 | dev->stats.rx_length_errors++; | |
335 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
e9d7417b | 336 | give_pages(rq, buf); |
9ab86bbc SM |
337 | else |
338 | dev_kfree_skb(buf); | |
339 | return; | |
340 | } | |
3f2c31d9 | 341 | |
9ab86bbc SM |
342 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
343 | skb = buf; | |
344 | len -= sizeof(struct virtio_net_hdr); | |
345 | skb_trim(skb, len); | |
346 | } else { | |
347 | page = buf; | |
e9d7417b | 348 | skb = page_to_skb(rq, page, len); |
9ab86bbc | 349 | if (unlikely(!skb)) { |
3f2c31d9 | 350 | dev->stats.rx_dropped++; |
e9d7417b | 351 | give_pages(rq, page); |
9ab86bbc | 352 | return; |
3f2c31d9 | 353 | } |
9ab86bbc | 354 | if (vi->mergeable_rx_bufs) |
e9d7417b | 355 | if (receive_mergeable(rq, skb)) { |
9ab86bbc SM |
356 | dev_kfree_skb(skb); |
357 | return; | |
358 | } | |
97402b96 | 359 | } |
3f2c31d9 | 360 | |
9ab86bbc | 361 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 362 | |
83a27052 | 363 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 364 | stats->rx_bytes += skb->len; |
365 | stats->rx_packets++; | |
83a27052 | 366 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 367 | |
b3f24698 | 368 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 369 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
370 | if (!skb_partial_csum_set(skb, |
371 | hdr->hdr.csum_start, | |
372 | hdr->hdr.csum_offset)) | |
296f96fc | 373 | goto frame_err; |
10a8d94a JW |
374 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
375 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
376 | } |
377 | ||
23cde76d MM |
378 | skb->protocol = eth_type_trans(skb, dev); |
379 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
380 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
381 | ||
b3f24698 | 382 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 383 | pr_debug("GSO!\n"); |
b3f24698 | 384 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
385 | case VIRTIO_NET_HDR_GSO_TCPV4: |
386 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
387 | break; | |
296f96fc RR |
388 | case VIRTIO_NET_HDR_GSO_UDP: |
389 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
390 | break; | |
391 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
392 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
393 | break; | |
394 | default: | |
be443899 AW |
395 | net_warn_ratelimited("%s: bad gso type %u.\n", |
396 | dev->name, hdr->hdr.gso_type); | |
296f96fc RR |
397 | goto frame_err; |
398 | } | |
399 | ||
b3f24698 | 400 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
34a48579 RR |
401 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
402 | ||
b3f24698 | 403 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc | 404 | if (skb_shinfo(skb)->gso_size == 0) { |
be443899 | 405 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
296f96fc RR |
406 | goto frame_err; |
407 | } | |
408 | ||
409 | /* Header must be checked, and gso_segs computed. */ | |
410 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
411 | skb_shinfo(skb)->gso_segs = 0; | |
412 | } | |
413 | ||
414 | netif_receive_skb(skb); | |
415 | return; | |
416 | ||
417 | frame_err: | |
418 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
419 | dev_kfree_skb(skb); |
420 | } | |
421 | ||
e9d7417b | 422 | static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp) |
296f96fc | 423 | { |
e9d7417b | 424 | struct virtnet_info *vi = rq->vq->vdev->priv; |
296f96fc | 425 | struct sk_buff *skb; |
9ab86bbc | 426 | struct skb_vnet_hdr *hdr; |
9ab86bbc | 427 | int err; |
3f2c31d9 | 428 | |
3464645a | 429 | skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp); |
9ab86bbc SM |
430 | if (unlikely(!skb)) |
431 | return -ENOMEM; | |
296f96fc | 432 | |
9ab86bbc | 433 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 434 | |
9ab86bbc | 435 | hdr = skb_vnet_hdr(skb); |
e9d7417b | 436 | sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr); |
97402b96 | 437 | |
e9d7417b | 438 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
97402b96 | 439 | |
e9d7417b | 440 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, 2, skb, gfp); |
9ab86bbc SM |
441 | if (err < 0) |
442 | dev_kfree_skb(skb); | |
97402b96 | 443 | |
9ab86bbc SM |
444 | return err; |
445 | } | |
97402b96 | 446 | |
e9d7417b | 447 | static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 448 | { |
9ab86bbc SM |
449 | struct page *first, *list = NULL; |
450 | char *p; | |
451 | int i, err, offset; | |
452 | ||
e9d7417b | 453 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 454 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 455 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
456 | if (!first) { |
457 | if (list) | |
e9d7417b | 458 | give_pages(rq, list); |
9ab86bbc | 459 | return -ENOMEM; |
97402b96 | 460 | } |
e9d7417b | 461 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 462 | |
9ab86bbc SM |
463 | /* chain new page in list head to match sg */ |
464 | first->private = (unsigned long)list; | |
465 | list = first; | |
466 | } | |
296f96fc | 467 | |
e9d7417b | 468 | first = get_a_page(rq, gfp); |
9ab86bbc | 469 | if (!first) { |
e9d7417b | 470 | give_pages(rq, list); |
9ab86bbc SM |
471 | return -ENOMEM; |
472 | } | |
473 | p = page_address(first); | |
474 | ||
e9d7417b JW |
475 | /* rq->sg[0], rq->sg[1] share the same page */ |
476 | /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */ | |
477 | sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr)); | |
9ab86bbc | 478 | |
e9d7417b | 479 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 480 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 481 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
482 | |
483 | /* chain first in list head */ | |
484 | first->private = (unsigned long)list; | |
e9d7417b | 485 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, MAX_SKB_FRAGS + 2, |
f96fde41 | 486 | first, gfp); |
9ab86bbc | 487 | if (err < 0) |
e9d7417b | 488 | give_pages(rq, first); |
9ab86bbc SM |
489 | |
490 | return err; | |
296f96fc RR |
491 | } |
492 | ||
e9d7417b | 493 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) |
3f2c31d9 | 494 | { |
9ab86bbc | 495 | struct page *page; |
3f2c31d9 | 496 | int err; |
3f2c31d9 | 497 | |
e9d7417b | 498 | page = get_a_page(rq, gfp); |
9ab86bbc SM |
499 | if (!page) |
500 | return -ENOMEM; | |
3f2c31d9 | 501 | |
e9d7417b | 502 | sg_init_one(rq->sg, page_address(page), PAGE_SIZE); |
3f2c31d9 | 503 | |
e9d7417b | 504 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, 1, page, gfp); |
9ab86bbc | 505 | if (err < 0) |
e9d7417b | 506 | give_pages(rq, page); |
3f2c31d9 | 507 | |
9ab86bbc SM |
508 | return err; |
509 | } | |
3f2c31d9 | 510 | |
b2baed69 RR |
511 | /* |
512 | * Returns false if we couldn't fill entirely (OOM). | |
513 | * | |
514 | * Normally run in the receive path, but can also be run from ndo_open | |
515 | * before we're receiving packets, or from refill_work which is | |
516 | * careful to disable receiving (using napi_disable). | |
517 | */ | |
e9d7417b | 518 | static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 519 | { |
e9d7417b | 520 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc | 521 | int err; |
1788f495 | 522 | bool oom; |
3f2c31d9 | 523 | |
9ab86bbc SM |
524 | do { |
525 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 526 | err = add_recvbuf_mergeable(rq, gfp); |
9ab86bbc | 527 | else if (vi->big_packets) |
e9d7417b | 528 | err = add_recvbuf_big(rq, gfp); |
9ab86bbc | 529 | else |
e9d7417b | 530 | err = add_recvbuf_small(rq, gfp); |
3f2c31d9 | 531 | |
1788f495 MT |
532 | oom = err == -ENOMEM; |
533 | if (err < 0) | |
3f2c31d9 | 534 | break; |
e9d7417b | 535 | ++rq->num; |
0aea51c3 | 536 | } while (err > 0); |
e9d7417b JW |
537 | if (unlikely(rq->num > rq->max)) |
538 | rq->max = rq->num; | |
539 | virtqueue_kick(rq->vq); | |
3161e453 | 540 | return !oom; |
3f2c31d9 MM |
541 | } |
542 | ||
18445c4d | 543 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
544 | { |
545 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 546 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 547 | |
18445c4d | 548 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 549 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 550 | virtqueue_disable_cb(rvq); |
e9d7417b | 551 | __napi_schedule(&rq->napi); |
18445c4d | 552 | } |
296f96fc RR |
553 | } |
554 | ||
e9d7417b | 555 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 556 | { |
e9d7417b | 557 | napi_enable(&rq->napi); |
3e9d08ec BR |
558 | |
559 | /* If all buffers were filled by other side before we napi_enabled, we | |
560 | * won't get another interrupt, so process any outstanding packets | |
561 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
562 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
563 | if (napi_schedule_prep(&rq->napi)) { |
564 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 565 | local_bh_disable(); |
e9d7417b | 566 | __napi_schedule(&rq->napi); |
ec13ee80 | 567 | local_bh_enable(); |
3e9d08ec BR |
568 | } |
569 | } | |
570 | ||
3161e453 RR |
571 | static void refill_work(struct work_struct *work) |
572 | { | |
e9d7417b JW |
573 | struct virtnet_info *vi = |
574 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 575 | bool still_empty; |
986a4f4d JW |
576 | int i; |
577 | ||
578 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
579 | struct receive_queue *rq = &vi->rq[i]; | |
3161e453 | 580 | |
986a4f4d JW |
581 | napi_disable(&rq->napi); |
582 | still_empty = !try_fill_recv(rq, GFP_KERNEL); | |
583 | virtnet_napi_enable(rq); | |
3161e453 | 584 | |
986a4f4d JW |
585 | /* In theory, this can happen: if we don't get any buffers in |
586 | * we will *never* try to fill again. | |
587 | */ | |
588 | if (still_empty) | |
589 | schedule_delayed_work(&vi->refill, HZ/2); | |
590 | } | |
3161e453 RR |
591 | } |
592 | ||
296f96fc RR |
593 | static int virtnet_poll(struct napi_struct *napi, int budget) |
594 | { | |
e9d7417b JW |
595 | struct receive_queue *rq = |
596 | container_of(napi, struct receive_queue, napi); | |
597 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
9ab86bbc | 598 | void *buf; |
296f96fc RR |
599 | unsigned int len, received = 0; |
600 | ||
601 | again: | |
602 | while (received < budget && | |
e9d7417b JW |
603 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
604 | receive_buf(rq, buf, len); | |
605 | --rq->num; | |
296f96fc RR |
606 | received++; |
607 | } | |
608 | ||
e9d7417b JW |
609 | if (rq->num < rq->max / 2) { |
610 | if (!try_fill_recv(rq, GFP_ATOMIC)) | |
3b07e9ca | 611 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 612 | } |
296f96fc | 613 | |
8329d98e RR |
614 | /* Out of packets? */ |
615 | if (received < budget) { | |
288379f0 | 616 | napi_complete(napi); |
e9d7417b | 617 | if (unlikely(!virtqueue_enable_cb(rq->vq)) && |
8e95a202 | 618 | napi_schedule_prep(napi)) { |
e9d7417b | 619 | virtqueue_disable_cb(rq->vq); |
288379f0 | 620 | __napi_schedule(napi); |
296f96fc | 621 | goto again; |
4265f161 | 622 | } |
296f96fc RR |
623 | } |
624 | ||
625 | return received; | |
626 | } | |
627 | ||
986a4f4d JW |
628 | static int virtnet_open(struct net_device *dev) |
629 | { | |
630 | struct virtnet_info *vi = netdev_priv(dev); | |
631 | int i; | |
632 | ||
633 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
634 | /* Make sure we have some buffers: if oom use wq. */ | |
635 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
636 | schedule_delayed_work(&vi->refill, 0); | |
637 | virtnet_napi_enable(&vi->rq[i]); | |
638 | } | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
e9d7417b | 643 | static unsigned int free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
644 | { |
645 | struct sk_buff *skb; | |
48925e37 | 646 | unsigned int len, tot_sgs = 0; |
e9d7417b | 647 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 648 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 649 | |
e9d7417b | 650 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 651 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 652 | |
83a27052 | 653 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 654 | stats->tx_bytes += skb->len; |
655 | stats->tx_packets++; | |
83a27052 | 656 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 657 | |
48925e37 | 658 | tot_sgs += skb_vnet_hdr(skb)->num_sg; |
ed79bab8 | 659 | dev_kfree_skb_any(skb); |
296f96fc | 660 | } |
48925e37 | 661 | return tot_sgs; |
296f96fc RR |
662 | } |
663 | ||
e9d7417b | 664 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 665 | { |
b3f24698 | 666 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
296f96fc | 667 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 668 | struct virtnet_info *vi = sq->vq->vdev->priv; |
296f96fc | 669 | |
e174961c | 670 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 671 | |
296f96fc | 672 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 673 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
55508d60 | 674 | hdr->hdr.csum_start = skb_checksum_start_offset(skb); |
b3f24698 | 675 | hdr->hdr.csum_offset = skb->csum_offset; |
296f96fc | 676 | } else { |
b3f24698 RR |
677 | hdr->hdr.flags = 0; |
678 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
679 | } |
680 | ||
681 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
682 | hdr->hdr.hdr_len = skb_headlen(skb); |
683 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 684 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 685 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 686 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 687 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 688 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 689 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
690 | else |
691 | BUG(); | |
34a48579 | 692 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 693 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 694 | } else { |
b3f24698 RR |
695 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
696 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
697 | } |
698 | ||
b3f24698 | 699 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 MM |
700 | |
701 | /* Encode metadata header at front. */ | |
702 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 703 | sg_set_buf(sq->sg, &hdr->mhdr, sizeof hdr->mhdr); |
3f2c31d9 | 704 | else |
e9d7417b | 705 | sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr); |
3f2c31d9 | 706 | |
e9d7417b JW |
707 | hdr->num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; |
708 | return virtqueue_add_buf(sq->vq, sq->sg, hdr->num_sg, | |
f96fde41 | 709 | 0, skb, GFP_ATOMIC); |
11a3a154 RR |
710 | } |
711 | ||
424efe9c | 712 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
713 | { |
714 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
715 | int qnum = skb_get_queue_mapping(skb); |
716 | struct send_queue *sq = &vi->sq[qnum]; | |
48925e37 | 717 | int capacity; |
2cb9c6ba | 718 | |
2cb9c6ba | 719 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 720 | free_old_xmit_skbs(sq); |
99ffc696 | 721 | |
03f191ba | 722 | /* Try to transmit */ |
e9d7417b | 723 | capacity = xmit_skb(sq, skb); |
48925e37 RR |
724 | |
725 | /* This can happen with OOM and indirect buffers. */ | |
726 | if (unlikely(capacity < 0)) { | |
2e57b79c | 727 | if (likely(capacity == -ENOMEM)) { |
31304165 | 728 | if (net_ratelimit()) |
58eba97d | 729 | dev_warn(&dev->dev, |
986a4f4d JW |
730 | "TXQ (%d) failure: out of memory\n", |
731 | qnum); | |
31304165 | 732 | } else { |
2e57b79c RJ |
733 | dev->stats.tx_fifo_errors++; |
734 | if (net_ratelimit()) | |
58eba97d | 735 | dev_warn(&dev->dev, |
986a4f4d JW |
736 | "Unexpected TXQ (%d) failure: %d\n", |
737 | qnum, capacity); | |
48925e37 | 738 | } |
58eba97d RR |
739 | dev->stats.tx_dropped++; |
740 | kfree_skb(skb); | |
741 | return NETDEV_TX_OK; | |
296f96fc | 742 | } |
e9d7417b | 743 | virtqueue_kick(sq->vq); |
03f191ba | 744 | |
48925e37 RR |
745 | /* Don't wait up for transmitted skbs to be freed. */ |
746 | skb_orphan(skb); | |
747 | nf_reset(skb); | |
748 | ||
749 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
750 | * before it gets out of hand. Naturally, this wastes entries. */ | |
751 | if (capacity < 2+MAX_SKB_FRAGS) { | |
986a4f4d | 752 | netif_stop_subqueue(dev, qnum); |
e9d7417b | 753 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 754 | /* More just got used, free them then recheck. */ |
e9d7417b | 755 | capacity += free_old_xmit_skbs(sq); |
48925e37 | 756 | if (capacity >= 2+MAX_SKB_FRAGS) { |
986a4f4d | 757 | netif_start_subqueue(dev, qnum); |
e9d7417b | 758 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
759 | } |
760 | } | |
99ffc696 | 761 | } |
48925e37 RR |
762 | |
763 | return NETDEV_TX_OK; | |
296f96fc RR |
764 | } |
765 | ||
9c46f6d4 AW |
766 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
767 | { | |
768 | struct virtnet_info *vi = netdev_priv(dev); | |
769 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 770 | int ret; |
9c46f6d4 | 771 | |
f2f2c8b4 JP |
772 | ret = eth_mac_addr(dev, p); |
773 | if (ret) | |
774 | return ret; | |
9c46f6d4 | 775 | |
62994b2d AW |
776 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
777 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), | |
778 | dev->dev_addr, dev->addr_len); | |
9c46f6d4 AW |
779 | |
780 | return 0; | |
781 | } | |
782 | ||
3fa2a1df | 783 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
784 | struct rtnl_link_stats64 *tot) | |
785 | { | |
786 | struct virtnet_info *vi = netdev_priv(dev); | |
787 | int cpu; | |
788 | unsigned int start; | |
789 | ||
790 | for_each_possible_cpu(cpu) { | |
58472a76 | 791 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 792 | u64 tpackets, tbytes, rpackets, rbytes; |
793 | ||
794 | do { | |
e3906486 | 795 | start = u64_stats_fetch_begin_bh(&stats->tx_syncp); |
3fa2a1df | 796 | tpackets = stats->tx_packets; |
797 | tbytes = stats->tx_bytes; | |
e3906486 | 798 | } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start)); |
83a27052 ED |
799 | |
800 | do { | |
e3906486 | 801 | start = u64_stats_fetch_begin_bh(&stats->rx_syncp); |
3fa2a1df | 802 | rpackets = stats->rx_packets; |
803 | rbytes = stats->rx_bytes; | |
e3906486 | 804 | } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start)); |
3fa2a1df | 805 | |
806 | tot->rx_packets += rpackets; | |
807 | tot->tx_packets += tpackets; | |
808 | tot->rx_bytes += rbytes; | |
809 | tot->tx_bytes += tbytes; | |
810 | } | |
811 | ||
812 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 813 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 814 | tot->rx_dropped = dev->stats.rx_dropped; |
815 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
816 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
817 | ||
818 | return tot; | |
819 | } | |
820 | ||
da74e89d AS |
821 | #ifdef CONFIG_NET_POLL_CONTROLLER |
822 | static void virtnet_netpoll(struct net_device *dev) | |
823 | { | |
824 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 825 | int i; |
da74e89d | 826 | |
986a4f4d JW |
827 | for (i = 0; i < vi->curr_queue_pairs; i++) |
828 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
829 | } |
830 | #endif | |
831 | ||
2a41f71d AW |
832 | /* |
833 | * Send command via the control virtqueue and check status. Commands | |
834 | * supported by the hypervisor, as indicated by feature bits, should | |
835 | * never fail unless improperly formated. | |
836 | */ | |
837 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
838 | struct scatterlist *data, int out, int in) | |
839 | { | |
23e258e1 | 840 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
2a41f71d AW |
841 | struct virtio_net_ctrl_hdr ctrl; |
842 | virtio_net_ctrl_ack status = ~0; | |
843 | unsigned int tmp; | |
23e258e1 | 844 | int i; |
2a41f71d | 845 | |
0ee904c3 AB |
846 | /* Caller should know better */ |
847 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || | |
848 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); | |
2a41f71d AW |
849 | |
850 | out++; /* Add header */ | |
851 | in++; /* Add return status */ | |
852 | ||
853 | ctrl.class = class; | |
854 | ctrl.cmd = cmd; | |
855 | ||
856 | sg_init_table(sg, out + in); | |
857 | ||
858 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); | |
23e258e1 AW |
859 | for_each_sg(data, s, out + in - 2, i) |
860 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); | |
2a41f71d AW |
861 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
862 | ||
f96fde41 | 863 | BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0); |
2a41f71d | 864 | |
1915a712 | 865 | virtqueue_kick(vi->cvq); |
2a41f71d AW |
866 | |
867 | /* | |
868 | * Spin for a response, the kick causes an ioport write, trapping | |
869 | * into the hypervisor, so the request should be handled immediately. | |
870 | */ | |
1915a712 | 871 | while (!virtqueue_get_buf(vi->cvq, &tmp)) |
2a41f71d AW |
872 | cpu_relax(); |
873 | ||
874 | return status == VIRTIO_NET_OK; | |
875 | } | |
876 | ||
586d17c5 JW |
877 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
878 | { | |
879 | rtnl_lock(); | |
880 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
881 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, | |
882 | 0, 0)) | |
883 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); | |
884 | rtnl_unlock(); | |
885 | } | |
886 | ||
986a4f4d JW |
887 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
888 | { | |
889 | struct scatterlist sg; | |
890 | struct virtio_net_ctrl_mq s; | |
891 | struct net_device *dev = vi->dev; | |
892 | ||
893 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
894 | return 0; | |
895 | ||
896 | s.virtqueue_pairs = queue_pairs; | |
897 | sg_init_one(&sg, &s, sizeof(s)); | |
898 | ||
899 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
900 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, 1, 0)){ | |
901 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", | |
902 | queue_pairs); | |
903 | return -EINVAL; | |
904 | } else | |
905 | vi->curr_queue_pairs = queue_pairs; | |
906 | ||
907 | return 0; | |
908 | } | |
909 | ||
296f96fc RR |
910 | static int virtnet_close(struct net_device *dev) |
911 | { | |
912 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 913 | int i; |
296f96fc | 914 | |
b2baed69 RR |
915 | /* Make sure refill_work doesn't re-enable napi! */ |
916 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d JW |
917 | |
918 | for (i = 0; i < vi->max_queue_pairs; i++) | |
919 | napi_disable(&vi->rq[i].napi); | |
296f96fc | 920 | |
296f96fc RR |
921 | return 0; |
922 | } | |
923 | ||
2af7698e AW |
924 | static void virtnet_set_rx_mode(struct net_device *dev) |
925 | { | |
926 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 927 | struct scatterlist sg[2]; |
2af7698e | 928 | u8 promisc, allmulti; |
f565a7c2 | 929 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 930 | struct netdev_hw_addr *ha; |
32e7bfc4 | 931 | int uc_count; |
4cd24eaf | 932 | int mc_count; |
f565a7c2 AW |
933 | void *buf; |
934 | int i; | |
2af7698e AW |
935 | |
936 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
937 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
938 | return; | |
939 | ||
f565a7c2 AW |
940 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
941 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 942 | |
23e258e1 | 943 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
944 | |
945 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
946 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f565a7c2 | 947 | sg, 1, 0)) |
2af7698e AW |
948 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
949 | promisc ? "en" : "dis"); | |
950 | ||
23e258e1 | 951 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
952 | |
953 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
954 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f565a7c2 | 955 | sg, 1, 0)) |
2af7698e AW |
956 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
957 | allmulti ? "en" : "dis"); | |
f565a7c2 | 958 | |
32e7bfc4 | 959 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 960 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 961 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
962 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
963 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
964 | mac_data = buf; | |
f565a7c2 AW |
965 | if (!buf) { |
966 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); | |
967 | return; | |
968 | } | |
969 | ||
23e258e1 AW |
970 | sg_init_table(sg, 2); |
971 | ||
f565a7c2 | 972 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 973 | mac_data->entries = uc_count; |
ccffad25 | 974 | i = 0; |
32e7bfc4 | 975 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 976 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
977 | |
978 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 979 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
980 | |
981 | /* multicast list and count fill the end */ | |
32e7bfc4 | 982 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 983 | |
4cd24eaf | 984 | mac_data->entries = mc_count; |
567ec874 | 985 | i = 0; |
22bedad3 JP |
986 | netdev_for_each_mc_addr(ha, dev) |
987 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
988 | |
989 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 990 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
991 | |
992 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
993 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
994 | sg, 2, 0)) | |
995 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); | |
996 | ||
997 | kfree(buf); | |
2af7698e AW |
998 | } |
999 | ||
8e586137 | 1000 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
1001 | { |
1002 | struct virtnet_info *vi = netdev_priv(dev); | |
1003 | struct scatterlist sg; | |
1004 | ||
23e258e1 | 1005 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1006 | |
1007 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
1008 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) | |
1009 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); | |
8e586137 | 1010 | return 0; |
0bde9569 AW |
1011 | } |
1012 | ||
8e586137 | 1013 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
1014 | { |
1015 | struct virtnet_info *vi = netdev_priv(dev); | |
1016 | struct scatterlist sg; | |
1017 | ||
23e258e1 | 1018 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1019 | |
1020 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
1021 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) | |
1022 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); | |
8e586137 | 1023 | return 0; |
0bde9569 AW |
1024 | } |
1025 | ||
986a4f4d JW |
1026 | static void virtnet_set_affinity(struct virtnet_info *vi, bool set) |
1027 | { | |
1028 | int i; | |
1029 | ||
1030 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1031 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1032 | * setting the affinity hint to eliminate the contention. | |
1033 | */ | |
1034 | if ((vi->curr_queue_pairs == 1 || | |
1035 | vi->max_queue_pairs != num_online_cpus()) && set) { | |
1036 | if (vi->affinity_hint_set) | |
1037 | set = false; | |
1038 | else | |
1039 | return; | |
1040 | } | |
1041 | ||
1042 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1043 | int cpu = set ? i : -1; | |
1044 | virtqueue_set_affinity(vi->rq[i].vq, cpu); | |
1045 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
1046 | } | |
1047 | ||
1048 | if (set) | |
1049 | vi->affinity_hint_set = true; | |
1050 | else | |
1051 | vi->affinity_hint_set = false; | |
1052 | } | |
1053 | ||
8f9f4668 RJ |
1054 | static void virtnet_get_ringparam(struct net_device *dev, |
1055 | struct ethtool_ringparam *ring) | |
1056 | { | |
1057 | struct virtnet_info *vi = netdev_priv(dev); | |
1058 | ||
986a4f4d JW |
1059 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1060 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1061 | ring->rx_pending = ring->rx_max_pending; |
1062 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1063 | } |
1064 | ||
66846048 RJ |
1065 | |
1066 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1067 | struct ethtool_drvinfo *info) | |
1068 | { | |
1069 | struct virtnet_info *vi = netdev_priv(dev); | |
1070 | struct virtio_device *vdev = vi->vdev; | |
1071 | ||
1072 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1073 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1074 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1075 | ||
1076 | } | |
1077 | ||
d73bcd2c JW |
1078 | /* TODO: Eliminate OOO packets during switching */ |
1079 | static int virtnet_set_channels(struct net_device *dev, | |
1080 | struct ethtool_channels *channels) | |
1081 | { | |
1082 | struct virtnet_info *vi = netdev_priv(dev); | |
1083 | u16 queue_pairs = channels->combined_count; | |
1084 | int err; | |
1085 | ||
1086 | /* We don't support separate rx/tx channels. | |
1087 | * We don't allow setting 'other' channels. | |
1088 | */ | |
1089 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1090 | return -EINVAL; | |
1091 | ||
1092 | if (queue_pairs > vi->max_queue_pairs) | |
1093 | return -EINVAL; | |
1094 | ||
1095 | err = virtnet_set_queues(vi, queue_pairs); | |
1096 | if (!err) { | |
1097 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1098 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1099 | ||
1100 | virtnet_set_affinity(vi, true); | |
1101 | } | |
1102 | ||
1103 | return err; | |
1104 | } | |
1105 | ||
1106 | static void virtnet_get_channels(struct net_device *dev, | |
1107 | struct ethtool_channels *channels) | |
1108 | { | |
1109 | struct virtnet_info *vi = netdev_priv(dev); | |
1110 | ||
1111 | channels->combined_count = vi->curr_queue_pairs; | |
1112 | channels->max_combined = vi->max_queue_pairs; | |
1113 | channels->max_other = 0; | |
1114 | channels->rx_count = 0; | |
1115 | channels->tx_count = 0; | |
1116 | channels->other_count = 0; | |
1117 | } | |
1118 | ||
0fc0b732 | 1119 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1120 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1121 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1122 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1123 | .set_channels = virtnet_set_channels, |
1124 | .get_channels = virtnet_get_channels, | |
a9ea3fc6 HX |
1125 | }; |
1126 | ||
39da5814 MM |
1127 | #define MIN_MTU 68 |
1128 | #define MAX_MTU 65535 | |
1129 | ||
1130 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
1131 | { | |
1132 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
1133 | return -EINVAL; | |
1134 | dev->mtu = new_mtu; | |
1135 | return 0; | |
1136 | } | |
1137 | ||
986a4f4d JW |
1138 | /* To avoid contending a lock hold by a vcpu who would exit to host, select the |
1139 | * txq based on the processor id. | |
1140 | * TODO: handle cpu hotplug. | |
1141 | */ | |
1142 | static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb) | |
1143 | { | |
1144 | int txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : | |
1145 | smp_processor_id(); | |
1146 | ||
1147 | while (unlikely(txq >= dev->real_num_tx_queues)) | |
1148 | txq -= dev->real_num_tx_queues; | |
1149 | ||
1150 | return txq; | |
1151 | } | |
1152 | ||
76288b4e SH |
1153 | static const struct net_device_ops virtnet_netdev = { |
1154 | .ndo_open = virtnet_open, | |
1155 | .ndo_stop = virtnet_close, | |
1156 | .ndo_start_xmit = start_xmit, | |
1157 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1158 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1159 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 1160 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 1161 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1162 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1163 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
986a4f4d | 1164 | .ndo_select_queue = virtnet_select_queue, |
76288b4e SH |
1165 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1166 | .ndo_poll_controller = virtnet_netpoll, | |
1167 | #endif | |
1168 | }; | |
1169 | ||
586d17c5 | 1170 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1171 | { |
586d17c5 JW |
1172 | struct virtnet_info *vi = |
1173 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1174 | u16 v; |
1175 | ||
586d17c5 JW |
1176 | mutex_lock(&vi->config_lock); |
1177 | if (!vi->config_enable) | |
1178 | goto done; | |
1179 | ||
77dd7693 | 1180 | if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS, |
9f4d26d0 | 1181 | offsetof(struct virtio_net_config, status), |
77dd7693 | 1182 | &v) < 0) |
586d17c5 JW |
1183 | goto done; |
1184 | ||
1185 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1186 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1187 | virtnet_ack_link_announce(vi); |
1188 | } | |
9f4d26d0 MM |
1189 | |
1190 | /* Ignore unknown (future) status bits */ | |
1191 | v &= VIRTIO_NET_S_LINK_UP; | |
1192 | ||
1193 | if (vi->status == v) | |
586d17c5 | 1194 | goto done; |
9f4d26d0 MM |
1195 | |
1196 | vi->status = v; | |
1197 | ||
1198 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1199 | netif_carrier_on(vi->dev); | |
986a4f4d | 1200 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
1201 | } else { |
1202 | netif_carrier_off(vi->dev); | |
986a4f4d | 1203 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 | 1204 | } |
586d17c5 JW |
1205 | done: |
1206 | mutex_unlock(&vi->config_lock); | |
9f4d26d0 MM |
1207 | } |
1208 | ||
1209 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1210 | { | |
1211 | struct virtnet_info *vi = vdev->priv; | |
1212 | ||
3b07e9ca | 1213 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1214 | } |
1215 | ||
986a4f4d JW |
1216 | static void virtnet_free_queues(struct virtnet_info *vi) |
1217 | { | |
1218 | kfree(vi->rq); | |
1219 | kfree(vi->sq); | |
1220 | } | |
1221 | ||
1222 | static void free_receive_bufs(struct virtnet_info *vi) | |
1223 | { | |
1224 | int i; | |
1225 | ||
1226 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1227 | while (vi->rq[i].pages) | |
1228 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | static void free_unused_bufs(struct virtnet_info *vi) | |
1233 | { | |
1234 | void *buf; | |
1235 | int i; | |
1236 | ||
1237 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1238 | struct virtqueue *vq = vi->sq[i].vq; | |
1239 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) | |
1240 | dev_kfree_skb(buf); | |
1241 | } | |
1242 | ||
1243 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1244 | struct virtqueue *vq = vi->rq[i].vq; | |
1245 | ||
1246 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
1247 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
1248 | give_pages(&vi->rq[i], buf); | |
1249 | else | |
1250 | dev_kfree_skb(buf); | |
1251 | --vi->rq[i].num; | |
1252 | } | |
1253 | BUG_ON(vi->rq[i].num != 0); | |
1254 | } | |
1255 | } | |
1256 | ||
e9d7417b JW |
1257 | static void virtnet_del_vqs(struct virtnet_info *vi) |
1258 | { | |
1259 | struct virtio_device *vdev = vi->vdev; | |
1260 | ||
986a4f4d JW |
1261 | virtnet_set_affinity(vi, false); |
1262 | ||
e9d7417b | 1263 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
1264 | |
1265 | virtnet_free_queues(vi); | |
e9d7417b JW |
1266 | } |
1267 | ||
986a4f4d | 1268 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 1269 | { |
986a4f4d JW |
1270 | vq_callback_t **callbacks; |
1271 | struct virtqueue **vqs; | |
1272 | int ret = -ENOMEM; | |
1273 | int i, total_vqs; | |
1274 | const char **names; | |
1275 | ||
1276 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
1277 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
1278 | * possible control vq. | |
1279 | */ | |
1280 | total_vqs = vi->max_queue_pairs * 2 + | |
1281 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
1282 | ||
1283 | /* Allocate space for find_vqs parameters */ | |
1284 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
1285 | if (!vqs) | |
1286 | goto err_vq; | |
1287 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
1288 | if (!callbacks) | |
1289 | goto err_callback; | |
1290 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
1291 | if (!names) | |
1292 | goto err_names; | |
1293 | ||
1294 | /* Parameters for control virtqueue, if any */ | |
1295 | if (vi->has_cvq) { | |
1296 | callbacks[total_vqs - 1] = NULL; | |
1297 | names[total_vqs - 1] = "control"; | |
1298 | } | |
3f9c10b0 | 1299 | |
986a4f4d JW |
1300 | /* Allocate/initialize parameters for send/receive virtqueues */ |
1301 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1302 | callbacks[rxq2vq(i)] = skb_recv_done; | |
1303 | callbacks[txq2vq(i)] = skb_xmit_done; | |
1304 | sprintf(vi->rq[i].name, "input.%d", i); | |
1305 | sprintf(vi->sq[i].name, "output.%d", i); | |
1306 | names[rxq2vq(i)] = vi->rq[i].name; | |
1307 | names[txq2vq(i)] = vi->sq[i].name; | |
1308 | } | |
3f9c10b0 | 1309 | |
986a4f4d JW |
1310 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
1311 | names); | |
1312 | if (ret) | |
1313 | goto err_find; | |
3f9c10b0 | 1314 | |
986a4f4d JW |
1315 | if (vi->has_cvq) { |
1316 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 AS |
1317 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
1318 | vi->dev->features |= NETIF_F_HW_VLAN_FILTER; | |
1319 | } | |
986a4f4d JW |
1320 | |
1321 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1322 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
1323 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
1324 | } | |
1325 | ||
1326 | kfree(names); | |
1327 | kfree(callbacks); | |
1328 | kfree(vqs); | |
1329 | ||
3f9c10b0 | 1330 | return 0; |
986a4f4d JW |
1331 | |
1332 | err_find: | |
1333 | kfree(names); | |
1334 | err_names: | |
1335 | kfree(callbacks); | |
1336 | err_callback: | |
1337 | kfree(vqs); | |
1338 | err_vq: | |
1339 | return ret; | |
1340 | } | |
1341 | ||
1342 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
1343 | { | |
1344 | int i; | |
1345 | ||
1346 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
1347 | if (!vi->sq) | |
1348 | goto err_sq; | |
1349 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
1350 | if (!vi->sq) | |
1351 | goto err_rq; | |
1352 | ||
1353 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
1354 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1355 | vi->rq[i].pages = NULL; | |
1356 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
1357 | napi_weight); | |
1358 | ||
1359 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
1360 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); | |
1361 | } | |
1362 | ||
1363 | return 0; | |
1364 | ||
1365 | err_rq: | |
1366 | kfree(vi->sq); | |
1367 | err_sq: | |
1368 | return -ENOMEM; | |
1369 | } | |
1370 | ||
1371 | static int init_vqs(struct virtnet_info *vi) | |
1372 | { | |
1373 | int ret; | |
1374 | ||
1375 | /* Allocate send & receive queues */ | |
1376 | ret = virtnet_alloc_queues(vi); | |
1377 | if (ret) | |
1378 | goto err; | |
1379 | ||
1380 | ret = virtnet_find_vqs(vi); | |
1381 | if (ret) | |
1382 | goto err_free; | |
1383 | ||
1384 | virtnet_set_affinity(vi, true); | |
1385 | return 0; | |
1386 | ||
1387 | err_free: | |
1388 | virtnet_free_queues(vi); | |
1389 | err: | |
1390 | return ret; | |
3f9c10b0 AS |
1391 | } |
1392 | ||
296f96fc RR |
1393 | static int virtnet_probe(struct virtio_device *vdev) |
1394 | { | |
986a4f4d | 1395 | int i, err; |
296f96fc RR |
1396 | struct net_device *dev; |
1397 | struct virtnet_info *vi; | |
986a4f4d JW |
1398 | u16 max_queue_pairs; |
1399 | ||
1400 | /* Find if host supports multiqueue virtio_net device */ | |
1401 | err = virtio_config_val(vdev, VIRTIO_NET_F_MQ, | |
1402 | offsetof(struct virtio_net_config, | |
1403 | max_virtqueue_pairs), &max_queue_pairs); | |
1404 | ||
1405 | /* We need at least 2 queue's */ | |
1406 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
1407 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
1408 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
1409 | max_queue_pairs = 1; | |
296f96fc RR |
1410 | |
1411 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 1412 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
1413 | if (!dev) |
1414 | return -ENOMEM; | |
1415 | ||
1416 | /* Set up network device as normal. */ | |
f2f2c8b4 | 1417 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 1418 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1419 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1420 | |
a9ea3fc6 | 1421 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
1422 | SET_NETDEV_DEV(dev, &vdev->dev); |
1423 | ||
1424 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1425 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1426 | /* This opens up the world of extra features. */ |
98e778c9 MM |
1427 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
1428 | if (csum) | |
1429 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1430 | ||
1431 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
1432 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO | |
34a48579 RR |
1433 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1434 | } | |
5539ae96 | 1435 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1436 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1437 | dev->hw_features |= NETIF_F_TSO; | |
1438 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1439 | dev->hw_features |= NETIF_F_TSO6; | |
1440 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1441 | dev->hw_features |= NETIF_F_TSO_ECN; | |
1442 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) | |
1443 | dev->hw_features |= NETIF_F_UFO; | |
1444 | ||
1445 | if (gso) | |
1446 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); | |
1447 | /* (!csum && gso) case will be fixed by register_netdev() */ | |
296f96fc RR |
1448 | } |
1449 | ||
1450 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
77dd7693 | 1451 | if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC, |
a586d4f6 | 1452 | offsetof(struct virtio_net_config, mac), |
77dd7693 | 1453 | dev->dev_addr, dev->addr_len) < 0) |
f2cedb63 | 1454 | eth_hw_addr_random(dev); |
296f96fc RR |
1455 | |
1456 | /* Set up our device-specific information */ | |
1457 | vi = netdev_priv(dev); | |
296f96fc RR |
1458 | vi->dev = dev; |
1459 | vi->vdev = vdev; | |
d9d5dcc8 | 1460 | vdev->priv = vi; |
3fa2a1df | 1461 | vi->stats = alloc_percpu(struct virtnet_stats); |
1462 | err = -ENOMEM; | |
1463 | if (vi->stats == NULL) | |
1464 | goto free; | |
1465 | ||
586d17c5 JW |
1466 | mutex_init(&vi->config_lock); |
1467 | vi->config_enable = true; | |
1468 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); | |
296f96fc | 1469 | |
97402b96 | 1470 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1471 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1472 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
1473 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
97402b96 HX |
1474 | vi->big_packets = true; |
1475 | ||
3f2c31d9 MM |
1476 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1477 | vi->mergeable_rx_bufs = true; | |
1478 | ||
986a4f4d JW |
1479 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
1480 | vi->has_cvq = true; | |
1481 | ||
1482 | /* Use single tx/rx queue pair as default */ | |
1483 | vi->curr_queue_pairs = 1; | |
1484 | vi->max_queue_pairs = max_queue_pairs; | |
1485 | ||
1486 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 1487 | err = init_vqs(vi); |
d2a7ddda | 1488 | if (err) |
3fa2a1df | 1489 | goto free_stats; |
296f96fc | 1490 | |
986a4f4d JW |
1491 | netif_set_real_num_tx_queues(dev, 1); |
1492 | netif_set_real_num_rx_queues(dev, 1); | |
1493 | ||
296f96fc RR |
1494 | err = register_netdev(dev); |
1495 | if (err) { | |
1496 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1497 | goto free_vqs; |
296f96fc | 1498 | } |
b3369c1f RR |
1499 | |
1500 | /* Last of all, set up some receive buffers. */ | |
986a4f4d JW |
1501 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1502 | try_fill_recv(&vi->rq[i], GFP_KERNEL); | |
1503 | ||
1504 | /* If we didn't even get one input buffer, we're useless. */ | |
1505 | if (vi->rq[i].num == 0) { | |
1506 | free_unused_bufs(vi); | |
1507 | err = -ENOMEM; | |
1508 | goto free_recv_bufs; | |
1509 | } | |
b3369c1f RR |
1510 | } |
1511 | ||
167c25e4 JW |
1512 | /* Assume link up if device can't report link status, |
1513 | otherwise get link status from config. */ | |
1514 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1515 | netif_carrier_off(dev); | |
3b07e9ca | 1516 | schedule_work(&vi->config_work); |
167c25e4 JW |
1517 | } else { |
1518 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1519 | netif_carrier_on(dev); | |
1520 | } | |
9f4d26d0 | 1521 | |
986a4f4d JW |
1522 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
1523 | dev->name, max_queue_pairs); | |
1524 | ||
296f96fc RR |
1525 | return 0; |
1526 | ||
986a4f4d JW |
1527 | free_recv_bufs: |
1528 | free_receive_bufs(vi); | |
b3369c1f | 1529 | unregister_netdev(dev); |
d2a7ddda | 1530 | free_vqs: |
986a4f4d | 1531 | cancel_delayed_work_sync(&vi->refill); |
e9d7417b | 1532 | virtnet_del_vqs(vi); |
3fa2a1df | 1533 | free_stats: |
1534 | free_percpu(vi->stats); | |
296f96fc RR |
1535 | free: |
1536 | free_netdev(dev); | |
1537 | return err; | |
1538 | } | |
1539 | ||
04486ed0 | 1540 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1541 | { |
04486ed0 | 1542 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1543 | |
1544 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1545 | free_unused_bufs(vi); |
fb6813f4 | 1546 | |
986a4f4d | 1547 | free_receive_bufs(vi); |
d2a7ddda | 1548 | |
986a4f4d | 1549 | virtnet_del_vqs(vi); |
04486ed0 AS |
1550 | } |
1551 | ||
8cc085d6 | 1552 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
1553 | { |
1554 | struct virtnet_info *vi = vdev->priv; | |
1555 | ||
586d17c5 JW |
1556 | /* Prevent config work handler from accessing the device. */ |
1557 | mutex_lock(&vi->config_lock); | |
1558 | vi->config_enable = false; | |
1559 | mutex_unlock(&vi->config_lock); | |
1560 | ||
04486ed0 AS |
1561 | unregister_netdev(vi->dev); |
1562 | ||
1563 | remove_vq_common(vi); | |
fb6813f4 | 1564 | |
586d17c5 JW |
1565 | flush_work(&vi->config_work); |
1566 | ||
2e66f55b | 1567 | free_percpu(vi->stats); |
74b2553f | 1568 | free_netdev(vi->dev); |
296f96fc RR |
1569 | } |
1570 | ||
0741bcb5 AS |
1571 | #ifdef CONFIG_PM |
1572 | static int virtnet_freeze(struct virtio_device *vdev) | |
1573 | { | |
1574 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1575 | int i; |
0741bcb5 | 1576 | |
586d17c5 JW |
1577 | /* Prevent config work handler from accessing the device */ |
1578 | mutex_lock(&vi->config_lock); | |
1579 | vi->config_enable = false; | |
1580 | mutex_unlock(&vi->config_lock); | |
1581 | ||
0741bcb5 AS |
1582 | netif_device_detach(vi->dev); |
1583 | cancel_delayed_work_sync(&vi->refill); | |
1584 | ||
1585 | if (netif_running(vi->dev)) | |
986a4f4d JW |
1586 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1587 | napi_disable(&vi->rq[i].napi); | |
1588 | netif_napi_del(&vi->rq[i].napi); | |
1589 | } | |
0741bcb5 AS |
1590 | |
1591 | remove_vq_common(vi); | |
1592 | ||
586d17c5 JW |
1593 | flush_work(&vi->config_work); |
1594 | ||
0741bcb5 AS |
1595 | return 0; |
1596 | } | |
1597 | ||
1598 | static int virtnet_restore(struct virtio_device *vdev) | |
1599 | { | |
1600 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1601 | int err, i; |
0741bcb5 AS |
1602 | |
1603 | err = init_vqs(vi); | |
1604 | if (err) | |
1605 | return err; | |
1606 | ||
1607 | if (netif_running(vi->dev)) | |
986a4f4d JW |
1608 | for (i = 0; i < vi->max_queue_pairs; i++) |
1609 | virtnet_napi_enable(&vi->rq[i]); | |
0741bcb5 AS |
1610 | |
1611 | netif_device_attach(vi->dev); | |
1612 | ||
986a4f4d JW |
1613 | for (i = 0; i < vi->max_queue_pairs; i++) |
1614 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
1615 | schedule_delayed_work(&vi->refill, 0); | |
0741bcb5 | 1616 | |
586d17c5 JW |
1617 | mutex_lock(&vi->config_lock); |
1618 | vi->config_enable = true; | |
1619 | mutex_unlock(&vi->config_lock); | |
1620 | ||
986a4f4d JW |
1621 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
1622 | ||
0741bcb5 AS |
1623 | return 0; |
1624 | } | |
1625 | #endif | |
1626 | ||
296f96fc RR |
1627 | static struct virtio_device_id id_table[] = { |
1628 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1629 | { 0 }, | |
1630 | }; | |
1631 | ||
c45a6816 | 1632 | static unsigned int features[] = { |
5e4fe5c4 MM |
1633 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1634 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1635 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1636 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1637 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1638 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1639 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
986a4f4d | 1640 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, |
c45a6816 RR |
1641 | }; |
1642 | ||
22402529 | 1643 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1644 | .feature_table = features, |
1645 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1646 | .driver.name = KBUILD_MODNAME, |
1647 | .driver.owner = THIS_MODULE, | |
1648 | .id_table = id_table, | |
1649 | .probe = virtnet_probe, | |
8cc085d6 | 1650 | .remove = virtnet_remove, |
9f4d26d0 | 1651 | .config_changed = virtnet_config_changed, |
0741bcb5 AS |
1652 | #ifdef CONFIG_PM |
1653 | .freeze = virtnet_freeze, | |
1654 | .restore = virtnet_restore, | |
1655 | #endif | |
296f96fc RR |
1656 | }; |
1657 | ||
1658 | static int __init init(void) | |
1659 | { | |
22402529 | 1660 | return register_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1661 | } |
1662 | ||
1663 | static void __exit fini(void) | |
1664 | { | |
22402529 | 1665 | unregister_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1666 | } |
1667 | module_init(init); | |
1668 | module_exit(fini); | |
1669 | ||
1670 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1671 | MODULE_DESCRIPTION("Virtio network driver"); | |
1672 | MODULE_LICENSE("GPL"); |