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 | }; | |
133 | }; | |
134 | ||
9ab86bbc SM |
135 | struct padded_vnet_hdr { |
136 | struct virtio_net_hdr hdr; | |
137 | /* | |
138 | * virtio_net_hdr should be in a separated sg buffer because of a | |
139 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
140 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
141 | */ | |
142 | char padding[6]; | |
143 | }; | |
144 | ||
986a4f4d JW |
145 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
146 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
147 | */ | |
148 | static int vq2txq(struct virtqueue *vq) | |
149 | { | |
150 | return (virtqueue_get_queue_index(vq) - 1) / 2; | |
151 | } | |
152 | ||
153 | static int txq2vq(int txq) | |
154 | { | |
155 | return txq * 2 + 1; | |
156 | } | |
157 | ||
158 | static int vq2rxq(struct virtqueue *vq) | |
159 | { | |
160 | return virtqueue_get_queue_index(vq) / 2; | |
161 | } | |
162 | ||
163 | static int rxq2vq(int rxq) | |
164 | { | |
165 | return rxq * 2; | |
166 | } | |
167 | ||
b3f24698 | 168 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 169 | { |
b3f24698 | 170 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
171 | } |
172 | ||
9ab86bbc SM |
173 | /* |
174 | * private is used to chain pages for big packets, put the whole | |
175 | * most recent used list in the beginning for reuse | |
176 | */ | |
e9d7417b | 177 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 178 | { |
9ab86bbc | 179 | struct page *end; |
0a888fd1 | 180 | |
e9d7417b | 181 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 182 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
183 | end->private = (unsigned long)rq->pages; |
184 | rq->pages = page; | |
0a888fd1 MM |
185 | } |
186 | ||
e9d7417b | 187 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 188 | { |
e9d7417b | 189 | struct page *p = rq->pages; |
fb6813f4 | 190 | |
9ab86bbc | 191 | if (p) { |
e9d7417b | 192 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
193 | /* clear private here, it is used to chain pages */ |
194 | p->private = 0; | |
195 | } else | |
fb6813f4 RR |
196 | p = alloc_page(gfp_mask); |
197 | return p; | |
198 | } | |
199 | ||
e9d7417b | 200 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 201 | { |
e9d7417b | 202 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 203 | |
2cb9c6ba | 204 | /* Suppress further interrupts. */ |
e9d7417b | 205 | virtqueue_disable_cb(vq); |
11a3a154 | 206 | |
363f1514 | 207 | /* We were probably waiting for more output buffers. */ |
986a4f4d | 208 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
296f96fc RR |
209 | } |
210 | ||
9ab86bbc SM |
211 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
212 | unsigned int offset, unsigned int *len) | |
296f96fc | 213 | { |
8a59a7b9 | 214 | int size = min((unsigned)PAGE_SIZE - offset, *len); |
9ab86bbc | 215 | int i = skb_shinfo(skb)->nr_frags; |
9ab86bbc | 216 | |
8a59a7b9 | 217 | __skb_fill_page_desc(skb, i, page, offset, size); |
9ab86bbc | 218 | |
8a59a7b9 KK |
219 | skb->data_len += size; |
220 | skb->len += size; | |
4b727361 | 221 | skb->truesize += PAGE_SIZE; |
9ab86bbc | 222 | skb_shinfo(skb)->nr_frags++; |
8a59a7b9 | 223 | *len -= size; |
9ab86bbc | 224 | } |
23cde76d | 225 | |
3464645a | 226 | /* Called from bottom half context */ |
e9d7417b | 227 | static struct sk_buff *page_to_skb(struct receive_queue *rq, |
9ab86bbc SM |
228 | struct page *page, unsigned int len) |
229 | { | |
e9d7417b | 230 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc SM |
231 | struct sk_buff *skb; |
232 | struct skb_vnet_hdr *hdr; | |
233 | unsigned int copy, hdr_len, offset; | |
234 | char *p; | |
fb6813f4 | 235 | |
9ab86bbc | 236 | p = page_address(page); |
3f2c31d9 | 237 | |
9ab86bbc SM |
238 | /* copy small packet so we can reuse these pages for small data */ |
239 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
240 | if (unlikely(!skb)) | |
241 | return NULL; | |
3f2c31d9 | 242 | |
9ab86bbc | 243 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 244 | |
9ab86bbc SM |
245 | if (vi->mergeable_rx_bufs) { |
246 | hdr_len = sizeof hdr->mhdr; | |
247 | offset = hdr_len; | |
248 | } else { | |
249 | hdr_len = sizeof hdr->hdr; | |
250 | offset = sizeof(struct padded_vnet_hdr); | |
251 | } | |
3f2c31d9 | 252 | |
9ab86bbc | 253 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 254 | |
9ab86bbc SM |
255 | len -= hdr_len; |
256 | p += offset; | |
3f2c31d9 | 257 | |
9ab86bbc SM |
258 | copy = len; |
259 | if (copy > skb_tailroom(skb)) | |
260 | copy = skb_tailroom(skb); | |
261 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 262 | |
9ab86bbc SM |
263 | len -= copy; |
264 | offset += copy; | |
3f2c31d9 | 265 | |
e878d78b SL |
266 | /* |
267 | * Verify that we can indeed put this data into a skb. | |
268 | * This is here to handle cases when the device erroneously | |
269 | * tries to receive more than is possible. This is usually | |
270 | * the case of a broken device. | |
271 | */ | |
272 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 273 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
274 | dev_kfree_skb(skb); |
275 | return NULL; | |
276 | } | |
277 | ||
9ab86bbc SM |
278 | while (len) { |
279 | set_skb_frag(skb, page, offset, &len); | |
280 | page = (struct page *)page->private; | |
281 | offset = 0; | |
282 | } | |
3f2c31d9 | 283 | |
9ab86bbc | 284 | if (page) |
e9d7417b | 285 | give_pages(rq, page); |
3f2c31d9 | 286 | |
9ab86bbc SM |
287 | return skb; |
288 | } | |
3f2c31d9 | 289 | |
e9d7417b | 290 | static int receive_mergeable(struct receive_queue *rq, struct sk_buff *skb) |
9ab86bbc SM |
291 | { |
292 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); | |
293 | struct page *page; | |
294 | int num_buf, i, len; | |
295 | ||
296 | num_buf = hdr->mhdr.num_buffers; | |
297 | while (--num_buf) { | |
298 | i = skb_shinfo(skb)->nr_frags; | |
299 | if (i >= MAX_SKB_FRAGS) { | |
300 | pr_debug("%s: packet too long\n", skb->dev->name); | |
301 | skb->dev->stats.rx_length_errors++; | |
302 | return -EINVAL; | |
303 | } | |
e9d7417b | 304 | page = virtqueue_get_buf(rq->vq, &len); |
9ab86bbc SM |
305 | if (!page) { |
306 | pr_debug("%s: rx error: %d buffers missing\n", | |
307 | skb->dev->name, hdr->mhdr.num_buffers); | |
308 | skb->dev->stats.rx_length_errors++; | |
309 | return -EINVAL; | |
3f2c31d9 | 310 | } |
3fa2a1df | 311 | |
9ab86bbc SM |
312 | if (len > PAGE_SIZE) |
313 | len = PAGE_SIZE; | |
314 | ||
315 | set_skb_frag(skb, page, 0, &len); | |
316 | ||
e9d7417b | 317 | --rq->num; |
9ab86bbc SM |
318 | } |
319 | return 0; | |
320 | } | |
321 | ||
e9d7417b | 322 | static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) |
9ab86bbc | 323 | { |
e9d7417b JW |
324 | struct virtnet_info *vi = rq->vq->vdev->priv; |
325 | struct net_device *dev = vi->dev; | |
58472a76 | 326 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc SM |
327 | struct sk_buff *skb; |
328 | struct page *page; | |
329 | struct skb_vnet_hdr *hdr; | |
3f2c31d9 | 330 | |
9ab86bbc SM |
331 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
332 | pr_debug("%s: short packet %i\n", dev->name, len); | |
333 | dev->stats.rx_length_errors++; | |
334 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
e9d7417b | 335 | give_pages(rq, buf); |
9ab86bbc SM |
336 | else |
337 | dev_kfree_skb(buf); | |
338 | return; | |
339 | } | |
3f2c31d9 | 340 | |
9ab86bbc SM |
341 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
342 | skb = buf; | |
343 | len -= sizeof(struct virtio_net_hdr); | |
344 | skb_trim(skb, len); | |
345 | } else { | |
346 | page = buf; | |
e9d7417b | 347 | skb = page_to_skb(rq, page, len); |
9ab86bbc | 348 | if (unlikely(!skb)) { |
3f2c31d9 | 349 | dev->stats.rx_dropped++; |
e9d7417b | 350 | give_pages(rq, page); |
9ab86bbc | 351 | return; |
3f2c31d9 | 352 | } |
9ab86bbc | 353 | if (vi->mergeable_rx_bufs) |
e9d7417b | 354 | if (receive_mergeable(rq, skb)) { |
9ab86bbc SM |
355 | dev_kfree_skb(skb); |
356 | return; | |
357 | } | |
97402b96 | 358 | } |
3f2c31d9 | 359 | |
9ab86bbc | 360 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 361 | |
83a27052 | 362 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 363 | stats->rx_bytes += skb->len; |
364 | stats->rx_packets++; | |
83a27052 | 365 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 366 | |
b3f24698 | 367 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 368 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
369 | if (!skb_partial_csum_set(skb, |
370 | hdr->hdr.csum_start, | |
371 | hdr->hdr.csum_offset)) | |
296f96fc | 372 | goto frame_err; |
10a8d94a JW |
373 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
374 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
375 | } |
376 | ||
23cde76d MM |
377 | skb->protocol = eth_type_trans(skb, dev); |
378 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
379 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
380 | ||
b3f24698 | 381 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 382 | pr_debug("GSO!\n"); |
b3f24698 | 383 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc RR |
384 | case VIRTIO_NET_HDR_GSO_TCPV4: |
385 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
386 | break; | |
296f96fc RR |
387 | case VIRTIO_NET_HDR_GSO_UDP: |
388 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
389 | break; | |
390 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
391 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
392 | break; | |
393 | default: | |
be443899 AW |
394 | net_warn_ratelimited("%s: bad gso type %u.\n", |
395 | dev->name, hdr->hdr.gso_type); | |
296f96fc RR |
396 | goto frame_err; |
397 | } | |
398 | ||
b3f24698 | 399 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
34a48579 RR |
400 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
401 | ||
b3f24698 | 402 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc | 403 | if (skb_shinfo(skb)->gso_size == 0) { |
be443899 | 404 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
296f96fc RR |
405 | goto frame_err; |
406 | } | |
407 | ||
408 | /* Header must be checked, and gso_segs computed. */ | |
409 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
410 | skb_shinfo(skb)->gso_segs = 0; | |
411 | } | |
412 | ||
413 | netif_receive_skb(skb); | |
414 | return; | |
415 | ||
416 | frame_err: | |
417 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
418 | dev_kfree_skb(skb); |
419 | } | |
420 | ||
e9d7417b | 421 | static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp) |
296f96fc | 422 | { |
e9d7417b | 423 | struct virtnet_info *vi = rq->vq->vdev->priv; |
296f96fc | 424 | struct sk_buff *skb; |
9ab86bbc | 425 | struct skb_vnet_hdr *hdr; |
9ab86bbc | 426 | int err; |
3f2c31d9 | 427 | |
3464645a | 428 | skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp); |
9ab86bbc SM |
429 | if (unlikely(!skb)) |
430 | return -ENOMEM; | |
296f96fc | 431 | |
9ab86bbc | 432 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 433 | |
9ab86bbc | 434 | hdr = skb_vnet_hdr(skb); |
e9d7417b | 435 | sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr); |
97402b96 | 436 | |
e9d7417b | 437 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
97402b96 | 438 | |
e9d7417b | 439 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, 2, skb, gfp); |
9ab86bbc SM |
440 | if (err < 0) |
441 | dev_kfree_skb(skb); | |
97402b96 | 442 | |
9ab86bbc SM |
443 | return err; |
444 | } | |
97402b96 | 445 | |
e9d7417b | 446 | static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 447 | { |
9ab86bbc SM |
448 | struct page *first, *list = NULL; |
449 | char *p; | |
450 | int i, err, offset; | |
451 | ||
e9d7417b | 452 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 453 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 454 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
455 | if (!first) { |
456 | if (list) | |
e9d7417b | 457 | give_pages(rq, list); |
9ab86bbc | 458 | return -ENOMEM; |
97402b96 | 459 | } |
e9d7417b | 460 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 461 | |
9ab86bbc SM |
462 | /* chain new page in list head to match sg */ |
463 | first->private = (unsigned long)list; | |
464 | list = first; | |
465 | } | |
296f96fc | 466 | |
e9d7417b | 467 | first = get_a_page(rq, gfp); |
9ab86bbc | 468 | if (!first) { |
e9d7417b | 469 | give_pages(rq, list); |
9ab86bbc SM |
470 | return -ENOMEM; |
471 | } | |
472 | p = page_address(first); | |
473 | ||
e9d7417b JW |
474 | /* rq->sg[0], rq->sg[1] share the same page */ |
475 | /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */ | |
476 | sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr)); | |
9ab86bbc | 477 | |
e9d7417b | 478 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 479 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 480 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
481 | |
482 | /* chain first in list head */ | |
483 | first->private = (unsigned long)list; | |
e9d7417b | 484 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, MAX_SKB_FRAGS + 2, |
f96fde41 | 485 | first, gfp); |
9ab86bbc | 486 | if (err < 0) |
e9d7417b | 487 | give_pages(rq, first); |
9ab86bbc SM |
488 | |
489 | return err; | |
296f96fc RR |
490 | } |
491 | ||
e9d7417b | 492 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) |
3f2c31d9 | 493 | { |
9ab86bbc | 494 | struct page *page; |
3f2c31d9 | 495 | int err; |
3f2c31d9 | 496 | |
e9d7417b | 497 | page = get_a_page(rq, gfp); |
9ab86bbc SM |
498 | if (!page) |
499 | return -ENOMEM; | |
3f2c31d9 | 500 | |
e9d7417b | 501 | sg_init_one(rq->sg, page_address(page), PAGE_SIZE); |
3f2c31d9 | 502 | |
e9d7417b | 503 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, 1, page, gfp); |
9ab86bbc | 504 | if (err < 0) |
e9d7417b | 505 | give_pages(rq, page); |
3f2c31d9 | 506 | |
9ab86bbc SM |
507 | return err; |
508 | } | |
3f2c31d9 | 509 | |
b2baed69 RR |
510 | /* |
511 | * Returns false if we couldn't fill entirely (OOM). | |
512 | * | |
513 | * Normally run in the receive path, but can also be run from ndo_open | |
514 | * before we're receiving packets, or from refill_work which is | |
515 | * careful to disable receiving (using napi_disable). | |
516 | */ | |
e9d7417b | 517 | static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 518 | { |
e9d7417b | 519 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc | 520 | int err; |
1788f495 | 521 | bool oom; |
3f2c31d9 | 522 | |
9ab86bbc SM |
523 | do { |
524 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 525 | err = add_recvbuf_mergeable(rq, gfp); |
9ab86bbc | 526 | else if (vi->big_packets) |
e9d7417b | 527 | err = add_recvbuf_big(rq, gfp); |
9ab86bbc | 528 | else |
e9d7417b | 529 | err = add_recvbuf_small(rq, gfp); |
3f2c31d9 | 530 | |
1788f495 | 531 | oom = err == -ENOMEM; |
9ed4cb07 | 532 | if (err) |
3f2c31d9 | 533 | break; |
e9d7417b | 534 | ++rq->num; |
b7dfde95 | 535 | } while (rq->vq->num_free); |
e9d7417b JW |
536 | if (unlikely(rq->num > rq->max)) |
537 | rq->max = rq->num; | |
538 | virtqueue_kick(rq->vq); | |
3161e453 | 539 | return !oom; |
3f2c31d9 MM |
540 | } |
541 | ||
18445c4d | 542 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
543 | { |
544 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 545 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 546 | |
18445c4d | 547 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 548 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 549 | virtqueue_disable_cb(rvq); |
e9d7417b | 550 | __napi_schedule(&rq->napi); |
18445c4d | 551 | } |
296f96fc RR |
552 | } |
553 | ||
e9d7417b | 554 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 555 | { |
e9d7417b | 556 | napi_enable(&rq->napi); |
3e9d08ec BR |
557 | |
558 | /* If all buffers were filled by other side before we napi_enabled, we | |
559 | * won't get another interrupt, so process any outstanding packets | |
560 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
561 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
562 | if (napi_schedule_prep(&rq->napi)) { |
563 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 564 | local_bh_disable(); |
e9d7417b | 565 | __napi_schedule(&rq->napi); |
ec13ee80 | 566 | local_bh_enable(); |
3e9d08ec BR |
567 | } |
568 | } | |
569 | ||
3161e453 RR |
570 | static void refill_work(struct work_struct *work) |
571 | { | |
e9d7417b JW |
572 | struct virtnet_info *vi = |
573 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 574 | bool still_empty; |
986a4f4d JW |
575 | int i; |
576 | ||
577 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
578 | struct receive_queue *rq = &vi->rq[i]; | |
3161e453 | 579 | |
986a4f4d JW |
580 | napi_disable(&rq->napi); |
581 | still_empty = !try_fill_recv(rq, GFP_KERNEL); | |
582 | virtnet_napi_enable(rq); | |
3161e453 | 583 | |
986a4f4d JW |
584 | /* In theory, this can happen: if we don't get any buffers in |
585 | * we will *never* try to fill again. | |
586 | */ | |
587 | if (still_empty) | |
588 | schedule_delayed_work(&vi->refill, HZ/2); | |
589 | } | |
3161e453 RR |
590 | } |
591 | ||
296f96fc RR |
592 | static int virtnet_poll(struct napi_struct *napi, int budget) |
593 | { | |
e9d7417b JW |
594 | struct receive_queue *rq = |
595 | container_of(napi, struct receive_queue, napi); | |
596 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
9ab86bbc | 597 | void *buf; |
296f96fc RR |
598 | unsigned int len, received = 0; |
599 | ||
600 | again: | |
601 | while (received < budget && | |
e9d7417b JW |
602 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
603 | receive_buf(rq, buf, len); | |
604 | --rq->num; | |
296f96fc RR |
605 | received++; |
606 | } | |
607 | ||
e9d7417b JW |
608 | if (rq->num < rq->max / 2) { |
609 | if (!try_fill_recv(rq, GFP_ATOMIC)) | |
3b07e9ca | 610 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 611 | } |
296f96fc | 612 | |
8329d98e RR |
613 | /* Out of packets? */ |
614 | if (received < budget) { | |
288379f0 | 615 | napi_complete(napi); |
e9d7417b | 616 | if (unlikely(!virtqueue_enable_cb(rq->vq)) && |
8e95a202 | 617 | napi_schedule_prep(napi)) { |
e9d7417b | 618 | virtqueue_disable_cb(rq->vq); |
288379f0 | 619 | __napi_schedule(napi); |
296f96fc | 620 | goto again; |
4265f161 | 621 | } |
296f96fc RR |
622 | } |
623 | ||
624 | return received; | |
625 | } | |
626 | ||
986a4f4d JW |
627 | static int virtnet_open(struct net_device *dev) |
628 | { | |
629 | struct virtnet_info *vi = netdev_priv(dev); | |
630 | int i; | |
631 | ||
632 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
633 | /* Make sure we have some buffers: if oom use wq. */ | |
634 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
635 | schedule_delayed_work(&vi->refill, 0); | |
636 | virtnet_napi_enable(&vi->rq[i]); | |
637 | } | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
b7dfde95 | 642 | static void free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
643 | { |
644 | struct sk_buff *skb; | |
6ee57bcc | 645 | unsigned int len; |
e9d7417b | 646 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 647 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 648 | |
e9d7417b | 649 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 650 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 651 | |
83a27052 | 652 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 653 | stats->tx_bytes += skb->len; |
654 | stats->tx_packets++; | |
83a27052 | 655 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 656 | |
ed79bab8 | 657 | dev_kfree_skb_any(skb); |
296f96fc RR |
658 | } |
659 | } | |
660 | ||
e9d7417b | 661 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 662 | { |
b3f24698 | 663 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
296f96fc | 664 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 665 | struct virtnet_info *vi = sq->vq->vdev->priv; |
7bedc7dc | 666 | unsigned num_sg; |
296f96fc | 667 | |
e174961c | 668 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 669 | |
296f96fc | 670 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 671 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
55508d60 | 672 | hdr->hdr.csum_start = skb_checksum_start_offset(skb); |
b3f24698 | 673 | hdr->hdr.csum_offset = skb->csum_offset; |
296f96fc | 674 | } else { |
b3f24698 RR |
675 | hdr->hdr.flags = 0; |
676 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
677 | } |
678 | ||
679 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
680 | hdr->hdr.hdr_len = skb_headlen(skb); |
681 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 682 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 683 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 684 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 685 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 686 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 687 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
688 | else |
689 | BUG(); | |
34a48579 | 690 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 691 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 692 | } else { |
b3f24698 RR |
693 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
694 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
695 | } |
696 | ||
b3f24698 | 697 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 MM |
698 | |
699 | /* Encode metadata header at front. */ | |
700 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 701 | sg_set_buf(sq->sg, &hdr->mhdr, sizeof hdr->mhdr); |
3f2c31d9 | 702 | else |
e9d7417b | 703 | sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr); |
3f2c31d9 | 704 | |
b7dfde95 LT |
705 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; |
706 | return virtqueue_add_buf(sq->vq, sq->sg, num_sg, | |
f96fde41 | 707 | 0, skb, GFP_ATOMIC); |
11a3a154 RR |
708 | } |
709 | ||
424efe9c | 710 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
711 | { |
712 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
713 | int qnum = skb_get_queue_mapping(skb); |
714 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 715 | int err; |
2cb9c6ba | 716 | |
2cb9c6ba | 717 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 718 | free_old_xmit_skbs(sq); |
99ffc696 | 719 | |
03f191ba | 720 | /* Try to transmit */ |
b7dfde95 | 721 | err = xmit_skb(sq, skb); |
48925e37 | 722 | |
9ed4cb07 | 723 | /* This should not happen! */ |
0e3daa64 | 724 | if (unlikely(err)) { |
9ed4cb07 RR |
725 | dev->stats.tx_fifo_errors++; |
726 | if (net_ratelimit()) | |
727 | dev_warn(&dev->dev, | |
b7dfde95 | 728 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d RR |
729 | dev->stats.tx_dropped++; |
730 | kfree_skb(skb); | |
731 | return NETDEV_TX_OK; | |
296f96fc | 732 | } |
e9d7417b | 733 | virtqueue_kick(sq->vq); |
03f191ba | 734 | |
48925e37 RR |
735 | /* Don't wait up for transmitted skbs to be freed. */ |
736 | skb_orphan(skb); | |
737 | nf_reset(skb); | |
738 | ||
739 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
740 | * before it gets out of hand. Naturally, this wastes entries. */ | |
b7dfde95 | 741 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 742 | netif_stop_subqueue(dev, qnum); |
e9d7417b | 743 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 744 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
745 | free_old_xmit_skbs(sq); |
746 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 747 | netif_start_subqueue(dev, qnum); |
e9d7417b | 748 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
749 | } |
750 | } | |
99ffc696 | 751 | } |
48925e37 RR |
752 | |
753 | return NETDEV_TX_OK; | |
296f96fc RR |
754 | } |
755 | ||
9c46f6d4 AW |
756 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
757 | { | |
758 | struct virtnet_info *vi = netdev_priv(dev); | |
759 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 760 | int ret; |
9c46f6d4 | 761 | |
f2f2c8b4 JP |
762 | ret = eth_mac_addr(dev, p); |
763 | if (ret) | |
764 | return ret; | |
9c46f6d4 | 765 | |
62994b2d AW |
766 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
767 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), | |
768 | dev->dev_addr, dev->addr_len); | |
9c46f6d4 AW |
769 | |
770 | return 0; | |
771 | } | |
772 | ||
3fa2a1df | 773 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
774 | struct rtnl_link_stats64 *tot) | |
775 | { | |
776 | struct virtnet_info *vi = netdev_priv(dev); | |
777 | int cpu; | |
778 | unsigned int start; | |
779 | ||
780 | for_each_possible_cpu(cpu) { | |
58472a76 | 781 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 782 | u64 tpackets, tbytes, rpackets, rbytes; |
783 | ||
784 | do { | |
e3906486 | 785 | start = u64_stats_fetch_begin_bh(&stats->tx_syncp); |
3fa2a1df | 786 | tpackets = stats->tx_packets; |
787 | tbytes = stats->tx_bytes; | |
e3906486 | 788 | } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start)); |
83a27052 ED |
789 | |
790 | do { | |
e3906486 | 791 | start = u64_stats_fetch_begin_bh(&stats->rx_syncp); |
3fa2a1df | 792 | rpackets = stats->rx_packets; |
793 | rbytes = stats->rx_bytes; | |
e3906486 | 794 | } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start)); |
3fa2a1df | 795 | |
796 | tot->rx_packets += rpackets; | |
797 | tot->tx_packets += tpackets; | |
798 | tot->rx_bytes += rbytes; | |
799 | tot->tx_bytes += tbytes; | |
800 | } | |
801 | ||
802 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 803 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 804 | tot->rx_dropped = dev->stats.rx_dropped; |
805 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
806 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
807 | ||
808 | return tot; | |
809 | } | |
810 | ||
da74e89d AS |
811 | #ifdef CONFIG_NET_POLL_CONTROLLER |
812 | static void virtnet_netpoll(struct net_device *dev) | |
813 | { | |
814 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 815 | int i; |
da74e89d | 816 | |
986a4f4d JW |
817 | for (i = 0; i < vi->curr_queue_pairs; i++) |
818 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
819 | } |
820 | #endif | |
821 | ||
2a41f71d AW |
822 | /* |
823 | * Send command via the control virtqueue and check status. Commands | |
824 | * supported by the hypervisor, as indicated by feature bits, should | |
825 | * never fail unless improperly formated. | |
826 | */ | |
827 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
828 | struct scatterlist *data, int out, int in) | |
829 | { | |
23e258e1 | 830 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; |
2a41f71d AW |
831 | struct virtio_net_ctrl_hdr ctrl; |
832 | virtio_net_ctrl_ack status = ~0; | |
833 | unsigned int tmp; | |
23e258e1 | 834 | int i; |
2a41f71d | 835 | |
0ee904c3 AB |
836 | /* Caller should know better */ |
837 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || | |
838 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); | |
2a41f71d AW |
839 | |
840 | out++; /* Add header */ | |
841 | in++; /* Add return status */ | |
842 | ||
843 | ctrl.class = class; | |
844 | ctrl.cmd = cmd; | |
845 | ||
846 | sg_init_table(sg, out + in); | |
847 | ||
848 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); | |
23e258e1 AW |
849 | for_each_sg(data, s, out + in - 2, i) |
850 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); | |
2a41f71d AW |
851 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); |
852 | ||
f96fde41 | 853 | BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0); |
2a41f71d | 854 | |
1915a712 | 855 | virtqueue_kick(vi->cvq); |
2a41f71d AW |
856 | |
857 | /* | |
858 | * Spin for a response, the kick causes an ioport write, trapping | |
859 | * into the hypervisor, so the request should be handled immediately. | |
860 | */ | |
1915a712 | 861 | while (!virtqueue_get_buf(vi->cvq, &tmp)) |
2a41f71d AW |
862 | cpu_relax(); |
863 | ||
864 | return status == VIRTIO_NET_OK; | |
865 | } | |
866 | ||
586d17c5 JW |
867 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
868 | { | |
869 | rtnl_lock(); | |
870 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
871 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, | |
872 | 0, 0)) | |
873 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); | |
874 | rtnl_unlock(); | |
875 | } | |
876 | ||
986a4f4d JW |
877 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
878 | { | |
879 | struct scatterlist sg; | |
880 | struct virtio_net_ctrl_mq s; | |
881 | struct net_device *dev = vi->dev; | |
882 | ||
883 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
884 | return 0; | |
885 | ||
886 | s.virtqueue_pairs = queue_pairs; | |
887 | sg_init_one(&sg, &s, sizeof(s)); | |
888 | ||
889 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
890 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, 1, 0)){ | |
891 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", | |
892 | queue_pairs); | |
893 | return -EINVAL; | |
894 | } else | |
895 | vi->curr_queue_pairs = queue_pairs; | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
296f96fc RR |
900 | static int virtnet_close(struct net_device *dev) |
901 | { | |
902 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 903 | int i; |
296f96fc | 904 | |
b2baed69 RR |
905 | /* Make sure refill_work doesn't re-enable napi! */ |
906 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d JW |
907 | |
908 | for (i = 0; i < vi->max_queue_pairs; i++) | |
909 | napi_disable(&vi->rq[i].napi); | |
296f96fc | 910 | |
296f96fc RR |
911 | return 0; |
912 | } | |
913 | ||
2af7698e AW |
914 | static void virtnet_set_rx_mode(struct net_device *dev) |
915 | { | |
916 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 917 | struct scatterlist sg[2]; |
2af7698e | 918 | u8 promisc, allmulti; |
f565a7c2 | 919 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 920 | struct netdev_hw_addr *ha; |
32e7bfc4 | 921 | int uc_count; |
4cd24eaf | 922 | int mc_count; |
f565a7c2 AW |
923 | void *buf; |
924 | int i; | |
2af7698e AW |
925 | |
926 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
927 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
928 | return; | |
929 | ||
f565a7c2 AW |
930 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
931 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 932 | |
23e258e1 | 933 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
934 | |
935 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
936 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f565a7c2 | 937 | sg, 1, 0)) |
2af7698e AW |
938 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
939 | promisc ? "en" : "dis"); | |
940 | ||
23e258e1 | 941 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
942 | |
943 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
944 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f565a7c2 | 945 | sg, 1, 0)) |
2af7698e AW |
946 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
947 | allmulti ? "en" : "dis"); | |
f565a7c2 | 948 | |
32e7bfc4 | 949 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 950 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 951 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
952 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
953 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
954 | mac_data = buf; | |
f565a7c2 AW |
955 | if (!buf) { |
956 | dev_warn(&dev->dev, "No memory for MAC address buffer\n"); | |
957 | return; | |
958 | } | |
959 | ||
23e258e1 AW |
960 | sg_init_table(sg, 2); |
961 | ||
f565a7c2 | 962 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 963 | mac_data->entries = uc_count; |
ccffad25 | 964 | i = 0; |
32e7bfc4 | 965 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 966 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
967 | |
968 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 969 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
970 | |
971 | /* multicast list and count fill the end */ | |
32e7bfc4 | 972 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 973 | |
4cd24eaf | 974 | mac_data->entries = mc_count; |
567ec874 | 975 | i = 0; |
22bedad3 JP |
976 | netdev_for_each_mc_addr(ha, dev) |
977 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
978 | |
979 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 980 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
981 | |
982 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
983 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
984 | sg, 2, 0)) | |
985 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); | |
986 | ||
987 | kfree(buf); | |
2af7698e AW |
988 | } |
989 | ||
8e586137 | 990 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
991 | { |
992 | struct virtnet_info *vi = netdev_priv(dev); | |
993 | struct scatterlist sg; | |
994 | ||
23e258e1 | 995 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
996 | |
997 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
998 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) | |
999 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); | |
8e586137 | 1000 | return 0; |
0bde9569 AW |
1001 | } |
1002 | ||
8e586137 | 1003 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
1004 | { |
1005 | struct virtnet_info *vi = netdev_priv(dev); | |
1006 | struct scatterlist sg; | |
1007 | ||
23e258e1 | 1008 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1009 | |
1010 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
1011 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) | |
1012 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); | |
8e586137 | 1013 | return 0; |
0bde9569 AW |
1014 | } |
1015 | ||
986a4f4d JW |
1016 | static void virtnet_set_affinity(struct virtnet_info *vi, bool set) |
1017 | { | |
1018 | int i; | |
1019 | ||
1020 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1021 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1022 | * setting the affinity hint to eliminate the contention. | |
1023 | */ | |
1024 | if ((vi->curr_queue_pairs == 1 || | |
1025 | vi->max_queue_pairs != num_online_cpus()) && set) { | |
1026 | if (vi->affinity_hint_set) | |
1027 | set = false; | |
1028 | else | |
1029 | return; | |
1030 | } | |
1031 | ||
1032 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1033 | int cpu = set ? i : -1; | |
1034 | virtqueue_set_affinity(vi->rq[i].vq, cpu); | |
1035 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
1036 | } | |
1037 | ||
1038 | if (set) | |
1039 | vi->affinity_hint_set = true; | |
1040 | else | |
1041 | vi->affinity_hint_set = false; | |
1042 | } | |
1043 | ||
8f9f4668 RJ |
1044 | static void virtnet_get_ringparam(struct net_device *dev, |
1045 | struct ethtool_ringparam *ring) | |
1046 | { | |
1047 | struct virtnet_info *vi = netdev_priv(dev); | |
1048 | ||
986a4f4d JW |
1049 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1050 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1051 | ring->rx_pending = ring->rx_max_pending; |
1052 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1053 | } |
1054 | ||
66846048 RJ |
1055 | |
1056 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1057 | struct ethtool_drvinfo *info) | |
1058 | { | |
1059 | struct virtnet_info *vi = netdev_priv(dev); | |
1060 | struct virtio_device *vdev = vi->vdev; | |
1061 | ||
1062 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1063 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1064 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1065 | ||
1066 | } | |
1067 | ||
d73bcd2c JW |
1068 | /* TODO: Eliminate OOO packets during switching */ |
1069 | static int virtnet_set_channels(struct net_device *dev, | |
1070 | struct ethtool_channels *channels) | |
1071 | { | |
1072 | struct virtnet_info *vi = netdev_priv(dev); | |
1073 | u16 queue_pairs = channels->combined_count; | |
1074 | int err; | |
1075 | ||
1076 | /* We don't support separate rx/tx channels. | |
1077 | * We don't allow setting 'other' channels. | |
1078 | */ | |
1079 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1080 | return -EINVAL; | |
1081 | ||
1082 | if (queue_pairs > vi->max_queue_pairs) | |
1083 | return -EINVAL; | |
1084 | ||
1085 | err = virtnet_set_queues(vi, queue_pairs); | |
1086 | if (!err) { | |
1087 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1088 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1089 | ||
1090 | virtnet_set_affinity(vi, true); | |
1091 | } | |
1092 | ||
1093 | return err; | |
1094 | } | |
1095 | ||
1096 | static void virtnet_get_channels(struct net_device *dev, | |
1097 | struct ethtool_channels *channels) | |
1098 | { | |
1099 | struct virtnet_info *vi = netdev_priv(dev); | |
1100 | ||
1101 | channels->combined_count = vi->curr_queue_pairs; | |
1102 | channels->max_combined = vi->max_queue_pairs; | |
1103 | channels->max_other = 0; | |
1104 | channels->rx_count = 0; | |
1105 | channels->tx_count = 0; | |
1106 | channels->other_count = 0; | |
1107 | } | |
1108 | ||
0fc0b732 | 1109 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1110 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1111 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1112 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1113 | .set_channels = virtnet_set_channels, |
1114 | .get_channels = virtnet_get_channels, | |
a9ea3fc6 HX |
1115 | }; |
1116 | ||
39da5814 MM |
1117 | #define MIN_MTU 68 |
1118 | #define MAX_MTU 65535 | |
1119 | ||
1120 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
1121 | { | |
1122 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
1123 | return -EINVAL; | |
1124 | dev->mtu = new_mtu; | |
1125 | return 0; | |
1126 | } | |
1127 | ||
986a4f4d JW |
1128 | /* To avoid contending a lock hold by a vcpu who would exit to host, select the |
1129 | * txq based on the processor id. | |
1130 | * TODO: handle cpu hotplug. | |
1131 | */ | |
1132 | static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb) | |
1133 | { | |
1134 | int txq = skb_rx_queue_recorded(skb) ? skb_get_rx_queue(skb) : | |
1135 | smp_processor_id(); | |
1136 | ||
1137 | while (unlikely(txq >= dev->real_num_tx_queues)) | |
1138 | txq -= dev->real_num_tx_queues; | |
1139 | ||
1140 | return txq; | |
1141 | } | |
1142 | ||
76288b4e SH |
1143 | static const struct net_device_ops virtnet_netdev = { |
1144 | .ndo_open = virtnet_open, | |
1145 | .ndo_stop = virtnet_close, | |
1146 | .ndo_start_xmit = start_xmit, | |
1147 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1148 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1149 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 1150 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 1151 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1152 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1153 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
986a4f4d | 1154 | .ndo_select_queue = virtnet_select_queue, |
76288b4e SH |
1155 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1156 | .ndo_poll_controller = virtnet_netpoll, | |
1157 | #endif | |
1158 | }; | |
1159 | ||
586d17c5 | 1160 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1161 | { |
586d17c5 JW |
1162 | struct virtnet_info *vi = |
1163 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1164 | u16 v; |
1165 | ||
586d17c5 JW |
1166 | mutex_lock(&vi->config_lock); |
1167 | if (!vi->config_enable) | |
1168 | goto done; | |
1169 | ||
77dd7693 | 1170 | if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS, |
9f4d26d0 | 1171 | offsetof(struct virtio_net_config, status), |
77dd7693 | 1172 | &v) < 0) |
586d17c5 JW |
1173 | goto done; |
1174 | ||
1175 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1176 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1177 | virtnet_ack_link_announce(vi); |
1178 | } | |
9f4d26d0 MM |
1179 | |
1180 | /* Ignore unknown (future) status bits */ | |
1181 | v &= VIRTIO_NET_S_LINK_UP; | |
1182 | ||
1183 | if (vi->status == v) | |
586d17c5 | 1184 | goto done; |
9f4d26d0 MM |
1185 | |
1186 | vi->status = v; | |
1187 | ||
1188 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1189 | netif_carrier_on(vi->dev); | |
986a4f4d | 1190 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
1191 | } else { |
1192 | netif_carrier_off(vi->dev); | |
986a4f4d | 1193 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 | 1194 | } |
586d17c5 JW |
1195 | done: |
1196 | mutex_unlock(&vi->config_lock); | |
9f4d26d0 MM |
1197 | } |
1198 | ||
1199 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1200 | { | |
1201 | struct virtnet_info *vi = vdev->priv; | |
1202 | ||
3b07e9ca | 1203 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1204 | } |
1205 | ||
986a4f4d JW |
1206 | static void virtnet_free_queues(struct virtnet_info *vi) |
1207 | { | |
1208 | kfree(vi->rq); | |
1209 | kfree(vi->sq); | |
1210 | } | |
1211 | ||
1212 | static void free_receive_bufs(struct virtnet_info *vi) | |
1213 | { | |
1214 | int i; | |
1215 | ||
1216 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1217 | while (vi->rq[i].pages) | |
1218 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
1219 | } | |
1220 | } | |
1221 | ||
1222 | static void free_unused_bufs(struct virtnet_info *vi) | |
1223 | { | |
1224 | void *buf; | |
1225 | int i; | |
1226 | ||
1227 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1228 | struct virtqueue *vq = vi->sq[i].vq; | |
1229 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) | |
1230 | dev_kfree_skb(buf); | |
1231 | } | |
1232 | ||
1233 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1234 | struct virtqueue *vq = vi->rq[i].vq; | |
1235 | ||
1236 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
1237 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
1238 | give_pages(&vi->rq[i], buf); | |
1239 | else | |
1240 | dev_kfree_skb(buf); | |
1241 | --vi->rq[i].num; | |
1242 | } | |
1243 | BUG_ON(vi->rq[i].num != 0); | |
1244 | } | |
1245 | } | |
1246 | ||
e9d7417b JW |
1247 | static void virtnet_del_vqs(struct virtnet_info *vi) |
1248 | { | |
1249 | struct virtio_device *vdev = vi->vdev; | |
1250 | ||
986a4f4d JW |
1251 | virtnet_set_affinity(vi, false); |
1252 | ||
e9d7417b | 1253 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
1254 | |
1255 | virtnet_free_queues(vi); | |
e9d7417b JW |
1256 | } |
1257 | ||
986a4f4d | 1258 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 1259 | { |
986a4f4d JW |
1260 | vq_callback_t **callbacks; |
1261 | struct virtqueue **vqs; | |
1262 | int ret = -ENOMEM; | |
1263 | int i, total_vqs; | |
1264 | const char **names; | |
1265 | ||
1266 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
1267 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
1268 | * possible control vq. | |
1269 | */ | |
1270 | total_vqs = vi->max_queue_pairs * 2 + | |
1271 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
1272 | ||
1273 | /* Allocate space for find_vqs parameters */ | |
1274 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
1275 | if (!vqs) | |
1276 | goto err_vq; | |
1277 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
1278 | if (!callbacks) | |
1279 | goto err_callback; | |
1280 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
1281 | if (!names) | |
1282 | goto err_names; | |
1283 | ||
1284 | /* Parameters for control virtqueue, if any */ | |
1285 | if (vi->has_cvq) { | |
1286 | callbacks[total_vqs - 1] = NULL; | |
1287 | names[total_vqs - 1] = "control"; | |
1288 | } | |
3f9c10b0 | 1289 | |
986a4f4d JW |
1290 | /* Allocate/initialize parameters for send/receive virtqueues */ |
1291 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1292 | callbacks[rxq2vq(i)] = skb_recv_done; | |
1293 | callbacks[txq2vq(i)] = skb_xmit_done; | |
1294 | sprintf(vi->rq[i].name, "input.%d", i); | |
1295 | sprintf(vi->sq[i].name, "output.%d", i); | |
1296 | names[rxq2vq(i)] = vi->rq[i].name; | |
1297 | names[txq2vq(i)] = vi->sq[i].name; | |
1298 | } | |
3f9c10b0 | 1299 | |
986a4f4d JW |
1300 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
1301 | names); | |
1302 | if (ret) | |
1303 | goto err_find; | |
3f9c10b0 | 1304 | |
986a4f4d JW |
1305 | if (vi->has_cvq) { |
1306 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 AS |
1307 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
1308 | vi->dev->features |= NETIF_F_HW_VLAN_FILTER; | |
1309 | } | |
986a4f4d JW |
1310 | |
1311 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1312 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
1313 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
1314 | } | |
1315 | ||
1316 | kfree(names); | |
1317 | kfree(callbacks); | |
1318 | kfree(vqs); | |
1319 | ||
3f9c10b0 | 1320 | return 0; |
986a4f4d JW |
1321 | |
1322 | err_find: | |
1323 | kfree(names); | |
1324 | err_names: | |
1325 | kfree(callbacks); | |
1326 | err_callback: | |
1327 | kfree(vqs); | |
1328 | err_vq: | |
1329 | return ret; | |
1330 | } | |
1331 | ||
1332 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
1333 | { | |
1334 | int i; | |
1335 | ||
1336 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
1337 | if (!vi->sq) | |
1338 | goto err_sq; | |
1339 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 1340 | if (!vi->rq) |
986a4f4d JW |
1341 | goto err_rq; |
1342 | ||
1343 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
1344 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1345 | vi->rq[i].pages = NULL; | |
1346 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
1347 | napi_weight); | |
1348 | ||
1349 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
1350 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); | |
1351 | } | |
1352 | ||
1353 | return 0; | |
1354 | ||
1355 | err_rq: | |
1356 | kfree(vi->sq); | |
1357 | err_sq: | |
1358 | return -ENOMEM; | |
1359 | } | |
1360 | ||
1361 | static int init_vqs(struct virtnet_info *vi) | |
1362 | { | |
1363 | int ret; | |
1364 | ||
1365 | /* Allocate send & receive queues */ | |
1366 | ret = virtnet_alloc_queues(vi); | |
1367 | if (ret) | |
1368 | goto err; | |
1369 | ||
1370 | ret = virtnet_find_vqs(vi); | |
1371 | if (ret) | |
1372 | goto err_free; | |
1373 | ||
1374 | virtnet_set_affinity(vi, true); | |
1375 | return 0; | |
1376 | ||
1377 | err_free: | |
1378 | virtnet_free_queues(vi); | |
1379 | err: | |
1380 | return ret; | |
3f9c10b0 AS |
1381 | } |
1382 | ||
296f96fc RR |
1383 | static int virtnet_probe(struct virtio_device *vdev) |
1384 | { | |
986a4f4d | 1385 | int i, err; |
296f96fc RR |
1386 | struct net_device *dev; |
1387 | struct virtnet_info *vi; | |
986a4f4d JW |
1388 | u16 max_queue_pairs; |
1389 | ||
1390 | /* Find if host supports multiqueue virtio_net device */ | |
1391 | err = virtio_config_val(vdev, VIRTIO_NET_F_MQ, | |
1392 | offsetof(struct virtio_net_config, | |
1393 | max_virtqueue_pairs), &max_queue_pairs); | |
1394 | ||
1395 | /* We need at least 2 queue's */ | |
1396 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
1397 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
1398 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
1399 | max_queue_pairs = 1; | |
296f96fc RR |
1400 | |
1401 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 1402 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
1403 | if (!dev) |
1404 | return -ENOMEM; | |
1405 | ||
1406 | /* Set up network device as normal. */ | |
f2f2c8b4 | 1407 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 1408 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1409 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1410 | |
a9ea3fc6 | 1411 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
1412 | SET_NETDEV_DEV(dev, &vdev->dev); |
1413 | ||
1414 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1415 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1416 | /* This opens up the world of extra features. */ |
98e778c9 MM |
1417 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
1418 | if (csum) | |
1419 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1420 | ||
1421 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
1422 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO | |
34a48579 RR |
1423 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1424 | } | |
5539ae96 | 1425 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1426 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1427 | dev->hw_features |= NETIF_F_TSO; | |
1428 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1429 | dev->hw_features |= NETIF_F_TSO6; | |
1430 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1431 | dev->hw_features |= NETIF_F_TSO_ECN; | |
1432 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) | |
1433 | dev->hw_features |= NETIF_F_UFO; | |
1434 | ||
1435 | if (gso) | |
1436 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); | |
1437 | /* (!csum && gso) case will be fixed by register_netdev() */ | |
296f96fc RR |
1438 | } |
1439 | ||
1440 | /* Configuration may specify what MAC to use. Otherwise random. */ | |
77dd7693 | 1441 | if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC, |
a586d4f6 | 1442 | offsetof(struct virtio_net_config, mac), |
77dd7693 | 1443 | dev->dev_addr, dev->addr_len) < 0) |
f2cedb63 | 1444 | eth_hw_addr_random(dev); |
296f96fc RR |
1445 | |
1446 | /* Set up our device-specific information */ | |
1447 | vi = netdev_priv(dev); | |
296f96fc RR |
1448 | vi->dev = dev; |
1449 | vi->vdev = vdev; | |
d9d5dcc8 | 1450 | vdev->priv = vi; |
3fa2a1df | 1451 | vi->stats = alloc_percpu(struct virtnet_stats); |
1452 | err = -ENOMEM; | |
1453 | if (vi->stats == NULL) | |
1454 | goto free; | |
1455 | ||
586d17c5 JW |
1456 | mutex_init(&vi->config_lock); |
1457 | vi->config_enable = true; | |
1458 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); | |
296f96fc | 1459 | |
97402b96 | 1460 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1461 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1462 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
1463 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
97402b96 HX |
1464 | vi->big_packets = true; |
1465 | ||
3f2c31d9 MM |
1466 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1467 | vi->mergeable_rx_bufs = true; | |
1468 | ||
986a4f4d JW |
1469 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
1470 | vi->has_cvq = true; | |
1471 | ||
1472 | /* Use single tx/rx queue pair as default */ | |
1473 | vi->curr_queue_pairs = 1; | |
1474 | vi->max_queue_pairs = max_queue_pairs; | |
1475 | ||
1476 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 1477 | err = init_vqs(vi); |
d2a7ddda | 1478 | if (err) |
3fa2a1df | 1479 | goto free_stats; |
296f96fc | 1480 | |
986a4f4d JW |
1481 | netif_set_real_num_tx_queues(dev, 1); |
1482 | netif_set_real_num_rx_queues(dev, 1); | |
1483 | ||
296f96fc RR |
1484 | err = register_netdev(dev); |
1485 | if (err) { | |
1486 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1487 | goto free_vqs; |
296f96fc | 1488 | } |
b3369c1f RR |
1489 | |
1490 | /* Last of all, set up some receive buffers. */ | |
986a4f4d JW |
1491 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1492 | try_fill_recv(&vi->rq[i], GFP_KERNEL); | |
1493 | ||
1494 | /* If we didn't even get one input buffer, we're useless. */ | |
1495 | if (vi->rq[i].num == 0) { | |
1496 | free_unused_bufs(vi); | |
1497 | err = -ENOMEM; | |
1498 | goto free_recv_bufs; | |
1499 | } | |
b3369c1f RR |
1500 | } |
1501 | ||
167c25e4 JW |
1502 | /* Assume link up if device can't report link status, |
1503 | otherwise get link status from config. */ | |
1504 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1505 | netif_carrier_off(dev); | |
3b07e9ca | 1506 | schedule_work(&vi->config_work); |
167c25e4 JW |
1507 | } else { |
1508 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1509 | netif_carrier_on(dev); | |
1510 | } | |
9f4d26d0 | 1511 | |
986a4f4d JW |
1512 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
1513 | dev->name, max_queue_pairs); | |
1514 | ||
296f96fc RR |
1515 | return 0; |
1516 | ||
986a4f4d JW |
1517 | free_recv_bufs: |
1518 | free_receive_bufs(vi); | |
b3369c1f | 1519 | unregister_netdev(dev); |
d2a7ddda | 1520 | free_vqs: |
986a4f4d | 1521 | cancel_delayed_work_sync(&vi->refill); |
e9d7417b | 1522 | virtnet_del_vqs(vi); |
3fa2a1df | 1523 | free_stats: |
1524 | free_percpu(vi->stats); | |
296f96fc RR |
1525 | free: |
1526 | free_netdev(dev); | |
1527 | return err; | |
1528 | } | |
1529 | ||
04486ed0 | 1530 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1531 | { |
04486ed0 | 1532 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1533 | |
1534 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1535 | free_unused_bufs(vi); |
fb6813f4 | 1536 | |
986a4f4d | 1537 | free_receive_bufs(vi); |
d2a7ddda | 1538 | |
986a4f4d | 1539 | virtnet_del_vqs(vi); |
04486ed0 AS |
1540 | } |
1541 | ||
8cc085d6 | 1542 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
1543 | { |
1544 | struct virtnet_info *vi = vdev->priv; | |
1545 | ||
586d17c5 JW |
1546 | /* Prevent config work handler from accessing the device. */ |
1547 | mutex_lock(&vi->config_lock); | |
1548 | vi->config_enable = false; | |
1549 | mutex_unlock(&vi->config_lock); | |
1550 | ||
04486ed0 AS |
1551 | unregister_netdev(vi->dev); |
1552 | ||
1553 | remove_vq_common(vi); | |
fb6813f4 | 1554 | |
586d17c5 JW |
1555 | flush_work(&vi->config_work); |
1556 | ||
2e66f55b | 1557 | free_percpu(vi->stats); |
74b2553f | 1558 | free_netdev(vi->dev); |
296f96fc RR |
1559 | } |
1560 | ||
0741bcb5 AS |
1561 | #ifdef CONFIG_PM |
1562 | static int virtnet_freeze(struct virtio_device *vdev) | |
1563 | { | |
1564 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1565 | int i; |
0741bcb5 | 1566 | |
586d17c5 JW |
1567 | /* Prevent config work handler from accessing the device */ |
1568 | mutex_lock(&vi->config_lock); | |
1569 | vi->config_enable = false; | |
1570 | mutex_unlock(&vi->config_lock); | |
1571 | ||
0741bcb5 AS |
1572 | netif_device_detach(vi->dev); |
1573 | cancel_delayed_work_sync(&vi->refill); | |
1574 | ||
1575 | if (netif_running(vi->dev)) | |
986a4f4d JW |
1576 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1577 | napi_disable(&vi->rq[i].napi); | |
1578 | netif_napi_del(&vi->rq[i].napi); | |
1579 | } | |
0741bcb5 AS |
1580 | |
1581 | remove_vq_common(vi); | |
1582 | ||
586d17c5 JW |
1583 | flush_work(&vi->config_work); |
1584 | ||
0741bcb5 AS |
1585 | return 0; |
1586 | } | |
1587 | ||
1588 | static int virtnet_restore(struct virtio_device *vdev) | |
1589 | { | |
1590 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1591 | int err, i; |
0741bcb5 AS |
1592 | |
1593 | err = init_vqs(vi); | |
1594 | if (err) | |
1595 | return err; | |
1596 | ||
1597 | if (netif_running(vi->dev)) | |
986a4f4d JW |
1598 | for (i = 0; i < vi->max_queue_pairs; i++) |
1599 | virtnet_napi_enable(&vi->rq[i]); | |
0741bcb5 AS |
1600 | |
1601 | netif_device_attach(vi->dev); | |
1602 | ||
986a4f4d JW |
1603 | for (i = 0; i < vi->max_queue_pairs; i++) |
1604 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
1605 | schedule_delayed_work(&vi->refill, 0); | |
0741bcb5 | 1606 | |
586d17c5 JW |
1607 | mutex_lock(&vi->config_lock); |
1608 | vi->config_enable = true; | |
1609 | mutex_unlock(&vi->config_lock); | |
1610 | ||
986a4f4d JW |
1611 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
1612 | ||
0741bcb5 AS |
1613 | return 0; |
1614 | } | |
1615 | #endif | |
1616 | ||
296f96fc RR |
1617 | static struct virtio_device_id id_table[] = { |
1618 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1619 | { 0 }, | |
1620 | }; | |
1621 | ||
c45a6816 | 1622 | static unsigned int features[] = { |
5e4fe5c4 MM |
1623 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1624 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1625 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1626 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1627 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1628 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1629 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
986a4f4d | 1630 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, |
c45a6816 RR |
1631 | }; |
1632 | ||
22402529 | 1633 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1634 | .feature_table = features, |
1635 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1636 | .driver.name = KBUILD_MODNAME, |
1637 | .driver.owner = THIS_MODULE, | |
1638 | .id_table = id_table, | |
1639 | .probe = virtnet_probe, | |
8cc085d6 | 1640 | .remove = virtnet_remove, |
9f4d26d0 | 1641 | .config_changed = virtnet_config_changed, |
0741bcb5 AS |
1642 | #ifdef CONFIG_PM |
1643 | .freeze = virtnet_freeze, | |
1644 | .restore = virtnet_restore, | |
1645 | #endif | |
296f96fc RR |
1646 | }; |
1647 | ||
1648 | static int __init init(void) | |
1649 | { | |
22402529 | 1650 | return register_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1651 | } |
1652 | ||
1653 | static void __exit fini(void) | |
1654 | { | |
22402529 | 1655 | unregister_virtio_driver(&virtio_net_driver); |
296f96fc RR |
1656 | } |
1657 | module_init(init); | |
1658 | module_exit(fini); | |
1659 | ||
1660 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1661 | MODULE_DESCRIPTION("Virtio network driver"); | |
1662 | MODULE_LICENSE("GPL"); |