]>
Commit | Line | Data |
---|---|---|
48925e37 | 1 | /* A network driver using virtio. |
296f96fc RR |
2 | * |
3 | * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | //#define DEBUG | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 22 | #include <linux/ethtool.h> |
296f96fc RR |
23 | #include <linux/module.h> |
24 | #include <linux/virtio.h> | |
25 | #include <linux/virtio_net.h> | |
26 | #include <linux/scatterlist.h> | |
e918085a | 27 | #include <linux/if_vlan.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
8de4b2f3 | 29 | #include <linux/cpu.h> |
296f96fc | 30 | |
6c0cd7c0 DL |
31 | static int napi_weight = 128; |
32 | module_param(napi_weight, int, 0444); | |
33 | ||
eb939922 | 34 | static bool csum = true, gso = true; |
34a48579 RR |
35 | module_param(csum, bool, 0444); |
36 | module_param(gso, bool, 0444); | |
37 | ||
296f96fc | 38 | /* FIXME: MTU in config. */ |
e918085a | 39 | #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 40 | #define GOOD_COPY_LEN 128 |
296f96fc | 41 | |
f565a7c2 | 42 | #define VIRTNET_SEND_COMMAND_SG_MAX 2 |
66846048 | 43 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 44 | |
3fa2a1df | 45 | struct virtnet_stats { |
83a27052 ED |
46 | struct u64_stats_sync tx_syncp; |
47 | struct u64_stats_sync rx_syncp; | |
3fa2a1df | 48 | u64 tx_bytes; |
49 | u64 tx_packets; | |
50 | ||
51 | u64 rx_bytes; | |
52 | u64 rx_packets; | |
53 | }; | |
54 | ||
e9d7417b JW |
55 | /* Internal representation of a send virtqueue */ |
56 | struct send_queue { | |
57 | /* Virtqueue associated with this send _queue */ | |
58 | struct virtqueue *vq; | |
59 | ||
60 | /* TX: fragments + linear part + virtio header */ | |
61 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
62 | |
63 | /* Name of the send queue: output.$index */ | |
64 | char name[40]; | |
e9d7417b JW |
65 | }; |
66 | ||
67 | /* Internal representation of a receive virtqueue */ | |
68 | struct receive_queue { | |
69 | /* Virtqueue associated with this receive_queue */ | |
70 | struct virtqueue *vq; | |
71 | ||
296f96fc RR |
72 | struct napi_struct napi; |
73 | ||
74 | /* Number of input buffers, and max we've ever had. */ | |
75 | unsigned int num, max; | |
76 | ||
e9d7417b JW |
77 | /* Chain pages by the private ptr. */ |
78 | struct page *pages; | |
79 | ||
80 | /* RX: fragments + linear part + virtio header */ | |
81 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
82 | |
83 | /* Name of this receive queue: input.$index */ | |
84 | char name[40]; | |
e9d7417b JW |
85 | }; |
86 | ||
87 | struct virtnet_info { | |
88 | struct virtio_device *vdev; | |
89 | struct virtqueue *cvq; | |
90 | struct net_device *dev; | |
986a4f4d JW |
91 | struct send_queue *sq; |
92 | struct receive_queue *rq; | |
e9d7417b JW |
93 | unsigned int status; |
94 | ||
986a4f4d JW |
95 | /* Max # of queue pairs supported by the device */ |
96 | u16 max_queue_pairs; | |
97 | ||
98 | /* # of queue pairs currently used by the driver */ | |
99 | u16 curr_queue_pairs; | |
100 | ||
97402b96 HX |
101 | /* I like... big packets and I cannot lie! */ |
102 | bool big_packets; | |
103 | ||
3f2c31d9 MM |
104 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
105 | bool mergeable_rx_bufs; | |
106 | ||
986a4f4d JW |
107 | /* Has control virtqueue */ |
108 | bool has_cvq; | |
109 | ||
586d17c5 JW |
110 | /* enable config space updates */ |
111 | bool config_enable; | |
112 | ||
3fa2a1df | 113 | /* Active statistics */ |
114 | struct virtnet_stats __percpu *stats; | |
115 | ||
3161e453 RR |
116 | /* Work struct for refilling if we run low on memory. */ |
117 | struct delayed_work refill; | |
118 | ||
586d17c5 JW |
119 | /* Work struct for config space updates */ |
120 | struct work_struct config_work; | |
121 | ||
122 | /* Lock for config space updates */ | |
123 | struct mutex config_lock; | |
986a4f4d JW |
124 | |
125 | /* Does the affinity hint is set for virtqueues? */ | |
126 | bool affinity_hint_set; | |
47be2479 WG |
127 | |
128 | /* Per-cpu variable to show the mapping from CPU to virtqueue */ | |
129 | int __percpu *vq_index; | |
8de4b2f3 WG |
130 | |
131 | /* CPU hot plug notifier */ | |
132 | struct notifier_block nb; | |
296f96fc RR |
133 | }; |
134 | ||
b3f24698 RR |
135 | struct skb_vnet_hdr { |
136 | union { | |
137 | struct virtio_net_hdr hdr; | |
138 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
139 | }; | |
140 | }; | |
141 | ||
9ab86bbc SM |
142 | struct padded_vnet_hdr { |
143 | struct virtio_net_hdr hdr; | |
144 | /* | |
145 | * virtio_net_hdr should be in a separated sg buffer because of a | |
146 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
147 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
148 | */ | |
149 | char padding[6]; | |
150 | }; | |
151 | ||
986a4f4d JW |
152 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
153 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
154 | */ | |
155 | static int vq2txq(struct virtqueue *vq) | |
156 | { | |
9d0ca6ed | 157 | return (vq->index - 1) / 2; |
986a4f4d JW |
158 | } |
159 | ||
160 | static int txq2vq(int txq) | |
161 | { | |
162 | return txq * 2 + 1; | |
163 | } | |
164 | ||
165 | static int vq2rxq(struct virtqueue *vq) | |
166 | { | |
9d0ca6ed | 167 | return vq->index / 2; |
986a4f4d JW |
168 | } |
169 | ||
170 | static int rxq2vq(int rxq) | |
171 | { | |
172 | return rxq * 2; | |
173 | } | |
174 | ||
b3f24698 | 175 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 176 | { |
b3f24698 | 177 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
178 | } |
179 | ||
9ab86bbc SM |
180 | /* |
181 | * private is used to chain pages for big packets, put the whole | |
182 | * most recent used list in the beginning for reuse | |
183 | */ | |
e9d7417b | 184 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 185 | { |
9ab86bbc | 186 | struct page *end; |
0a888fd1 | 187 | |
e9d7417b | 188 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 189 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
190 | end->private = (unsigned long)rq->pages; |
191 | rq->pages = page; | |
0a888fd1 MM |
192 | } |
193 | ||
e9d7417b | 194 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 195 | { |
e9d7417b | 196 | struct page *p = rq->pages; |
fb6813f4 | 197 | |
9ab86bbc | 198 | if (p) { |
e9d7417b | 199 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
200 | /* clear private here, it is used to chain pages */ |
201 | p->private = 0; | |
202 | } else | |
fb6813f4 RR |
203 | p = alloc_page(gfp_mask); |
204 | return p; | |
205 | } | |
206 | ||
e9d7417b | 207 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 208 | { |
e9d7417b | 209 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 210 | |
2cb9c6ba | 211 | /* Suppress further interrupts. */ |
e9d7417b | 212 | virtqueue_disable_cb(vq); |
11a3a154 | 213 | |
363f1514 | 214 | /* We were probably waiting for more output buffers. */ |
986a4f4d | 215 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
296f96fc RR |
216 | } |
217 | ||
9ab86bbc SM |
218 | static void set_skb_frag(struct sk_buff *skb, struct page *page, |
219 | unsigned int offset, unsigned int *len) | |
296f96fc | 220 | { |
8a59a7b9 | 221 | int size = min((unsigned)PAGE_SIZE - offset, *len); |
9ab86bbc | 222 | int i = skb_shinfo(skb)->nr_frags; |
9ab86bbc | 223 | |
8a59a7b9 | 224 | __skb_fill_page_desc(skb, i, page, offset, size); |
9ab86bbc | 225 | |
8a59a7b9 KK |
226 | skb->data_len += size; |
227 | skb->len += size; | |
4b727361 | 228 | skb->truesize += PAGE_SIZE; |
9ab86bbc | 229 | skb_shinfo(skb)->nr_frags++; |
c9af6db4 | 230 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
8a59a7b9 | 231 | *len -= size; |
9ab86bbc | 232 | } |
23cde76d | 233 | |
3464645a | 234 | /* Called from bottom half context */ |
e9d7417b | 235 | static struct sk_buff *page_to_skb(struct receive_queue *rq, |
9ab86bbc SM |
236 | struct page *page, unsigned int len) |
237 | { | |
e9d7417b | 238 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc SM |
239 | struct sk_buff *skb; |
240 | struct skb_vnet_hdr *hdr; | |
241 | unsigned int copy, hdr_len, offset; | |
242 | char *p; | |
fb6813f4 | 243 | |
9ab86bbc | 244 | p = page_address(page); |
3f2c31d9 | 245 | |
9ab86bbc SM |
246 | /* copy small packet so we can reuse these pages for small data */ |
247 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
248 | if (unlikely(!skb)) | |
249 | return NULL; | |
3f2c31d9 | 250 | |
9ab86bbc | 251 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 252 | |
9ab86bbc SM |
253 | if (vi->mergeable_rx_bufs) { |
254 | hdr_len = sizeof hdr->mhdr; | |
255 | offset = hdr_len; | |
256 | } else { | |
257 | hdr_len = sizeof hdr->hdr; | |
258 | offset = sizeof(struct padded_vnet_hdr); | |
259 | } | |
3f2c31d9 | 260 | |
9ab86bbc | 261 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 262 | |
9ab86bbc SM |
263 | len -= hdr_len; |
264 | p += offset; | |
3f2c31d9 | 265 | |
9ab86bbc SM |
266 | copy = len; |
267 | if (copy > skb_tailroom(skb)) | |
268 | copy = skb_tailroom(skb); | |
269 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 270 | |
9ab86bbc SM |
271 | len -= copy; |
272 | offset += copy; | |
3f2c31d9 | 273 | |
e878d78b SL |
274 | /* |
275 | * Verify that we can indeed put this data into a skb. | |
276 | * This is here to handle cases when the device erroneously | |
277 | * tries to receive more than is possible. This is usually | |
278 | * the case of a broken device. | |
279 | */ | |
280 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 281 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
282 | dev_kfree_skb(skb); |
283 | return NULL; | |
284 | } | |
285 | ||
9ab86bbc SM |
286 | while (len) { |
287 | set_skb_frag(skb, page, offset, &len); | |
288 | page = (struct page *)page->private; | |
289 | offset = 0; | |
290 | } | |
3f2c31d9 | 291 | |
9ab86bbc | 292 | if (page) |
e9d7417b | 293 | give_pages(rq, page); |
3f2c31d9 | 294 | |
9ab86bbc SM |
295 | return skb; |
296 | } | |
3f2c31d9 | 297 | |
e9d7417b | 298 | static int receive_mergeable(struct receive_queue *rq, struct sk_buff *skb) |
9ab86bbc SM |
299 | { |
300 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); | |
301 | struct page *page; | |
302 | int num_buf, i, len; | |
303 | ||
304 | num_buf = hdr->mhdr.num_buffers; | |
305 | while (--num_buf) { | |
306 | i = skb_shinfo(skb)->nr_frags; | |
307 | if (i >= MAX_SKB_FRAGS) { | |
308 | pr_debug("%s: packet too long\n", skb->dev->name); | |
309 | skb->dev->stats.rx_length_errors++; | |
310 | return -EINVAL; | |
311 | } | |
e9d7417b | 312 | page = virtqueue_get_buf(rq->vq, &len); |
9ab86bbc SM |
313 | if (!page) { |
314 | pr_debug("%s: rx error: %d buffers missing\n", | |
315 | skb->dev->name, hdr->mhdr.num_buffers); | |
316 | skb->dev->stats.rx_length_errors++; | |
317 | return -EINVAL; | |
3f2c31d9 | 318 | } |
3fa2a1df | 319 | |
9ab86bbc SM |
320 | if (len > PAGE_SIZE) |
321 | len = PAGE_SIZE; | |
322 | ||
323 | set_skb_frag(skb, page, 0, &len); | |
324 | ||
e9d7417b | 325 | --rq->num; |
9ab86bbc SM |
326 | } |
327 | return 0; | |
328 | } | |
329 | ||
e9d7417b | 330 | static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) |
9ab86bbc | 331 | { |
e9d7417b JW |
332 | struct virtnet_info *vi = rq->vq->vdev->priv; |
333 | struct net_device *dev = vi->dev; | |
58472a76 | 334 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc SM |
335 | struct sk_buff *skb; |
336 | struct page *page; | |
337 | struct skb_vnet_hdr *hdr; | |
3f2c31d9 | 338 | |
9ab86bbc SM |
339 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
340 | pr_debug("%s: short packet %i\n", dev->name, len); | |
341 | dev->stats.rx_length_errors++; | |
342 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
e9d7417b | 343 | give_pages(rq, buf); |
9ab86bbc SM |
344 | else |
345 | dev_kfree_skb(buf); | |
346 | return; | |
347 | } | |
3f2c31d9 | 348 | |
9ab86bbc SM |
349 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
350 | skb = buf; | |
351 | len -= sizeof(struct virtio_net_hdr); | |
352 | skb_trim(skb, len); | |
353 | } else { | |
354 | page = buf; | |
e9d7417b | 355 | skb = page_to_skb(rq, page, len); |
9ab86bbc | 356 | if (unlikely(!skb)) { |
3f2c31d9 | 357 | dev->stats.rx_dropped++; |
e9d7417b | 358 | give_pages(rq, page); |
9ab86bbc | 359 | return; |
3f2c31d9 | 360 | } |
9ab86bbc | 361 | if (vi->mergeable_rx_bufs) |
e9d7417b | 362 | if (receive_mergeable(rq, skb)) { |
9ab86bbc SM |
363 | dev_kfree_skb(skb); |
364 | return; | |
365 | } | |
97402b96 | 366 | } |
3f2c31d9 | 367 | |
9ab86bbc | 368 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 369 | |
83a27052 | 370 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 371 | stats->rx_bytes += skb->len; |
372 | stats->rx_packets++; | |
83a27052 | 373 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 374 | |
b3f24698 | 375 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 376 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
377 | if (!skb_partial_csum_set(skb, |
378 | hdr->hdr.csum_start, | |
379 | hdr->hdr.csum_offset)) | |
296f96fc | 380 | goto frame_err; |
10a8d94a JW |
381 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
382 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
383 | } |
384 | ||
23cde76d MM |
385 | skb->protocol = eth_type_trans(skb, dev); |
386 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
387 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
388 | ||
b3f24698 | 389 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 390 | pr_debug("GSO!\n"); |
b3f24698 | 391 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc | 392 | case VIRTIO_NET_HDR_GSO_TCPV4: |
c9af6db4 | 393 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
296f96fc | 394 | break; |
296f96fc | 395 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 396 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
296f96fc RR |
397 | break; |
398 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 399 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
296f96fc RR |
400 | break; |
401 | default: | |
be443899 AW |
402 | net_warn_ratelimited("%s: bad gso type %u.\n", |
403 | dev->name, hdr->hdr.gso_type); | |
296f96fc RR |
404 | goto frame_err; |
405 | } | |
406 | ||
b3f24698 | 407 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
c9af6db4 | 408 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
34a48579 | 409 | |
b3f24698 | 410 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc | 411 | if (skb_shinfo(skb)->gso_size == 0) { |
be443899 | 412 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
296f96fc RR |
413 | goto frame_err; |
414 | } | |
415 | ||
416 | /* Header must be checked, and gso_segs computed. */ | |
417 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
418 | skb_shinfo(skb)->gso_segs = 0; | |
419 | } | |
420 | ||
421 | netif_receive_skb(skb); | |
422 | return; | |
423 | ||
424 | frame_err: | |
425 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
426 | dev_kfree_skb(skb); |
427 | } | |
428 | ||
e9d7417b | 429 | static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp) |
296f96fc | 430 | { |
e9d7417b | 431 | struct virtnet_info *vi = rq->vq->vdev->priv; |
296f96fc | 432 | struct sk_buff *skb; |
9ab86bbc | 433 | struct skb_vnet_hdr *hdr; |
9ab86bbc | 434 | int err; |
3f2c31d9 | 435 | |
3464645a | 436 | skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp); |
9ab86bbc SM |
437 | if (unlikely(!skb)) |
438 | return -ENOMEM; | |
296f96fc | 439 | |
9ab86bbc | 440 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 441 | |
9ab86bbc | 442 | hdr = skb_vnet_hdr(skb); |
e9d7417b | 443 | sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr); |
97402b96 | 444 | |
e9d7417b | 445 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
97402b96 | 446 | |
e9d7417b | 447 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, 2, skb, gfp); |
9ab86bbc SM |
448 | if (err < 0) |
449 | dev_kfree_skb(skb); | |
97402b96 | 450 | |
9ab86bbc SM |
451 | return err; |
452 | } | |
97402b96 | 453 | |
e9d7417b | 454 | static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 455 | { |
9ab86bbc SM |
456 | struct page *first, *list = NULL; |
457 | char *p; | |
458 | int i, err, offset; | |
459 | ||
e9d7417b | 460 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 461 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 462 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
463 | if (!first) { |
464 | if (list) | |
e9d7417b | 465 | give_pages(rq, list); |
9ab86bbc | 466 | return -ENOMEM; |
97402b96 | 467 | } |
e9d7417b | 468 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 469 | |
9ab86bbc SM |
470 | /* chain new page in list head to match sg */ |
471 | first->private = (unsigned long)list; | |
472 | list = first; | |
473 | } | |
296f96fc | 474 | |
e9d7417b | 475 | first = get_a_page(rq, gfp); |
9ab86bbc | 476 | if (!first) { |
e9d7417b | 477 | give_pages(rq, list); |
9ab86bbc SM |
478 | return -ENOMEM; |
479 | } | |
480 | p = page_address(first); | |
481 | ||
e9d7417b JW |
482 | /* rq->sg[0], rq->sg[1] share the same page */ |
483 | /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */ | |
484 | sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr)); | |
9ab86bbc | 485 | |
e9d7417b | 486 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 487 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 488 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
489 | |
490 | /* chain first in list head */ | |
491 | first->private = (unsigned long)list; | |
e9d7417b | 492 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, MAX_SKB_FRAGS + 2, |
f96fde41 | 493 | first, gfp); |
9ab86bbc | 494 | if (err < 0) |
e9d7417b | 495 | give_pages(rq, first); |
9ab86bbc SM |
496 | |
497 | return err; | |
296f96fc RR |
498 | } |
499 | ||
e9d7417b | 500 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) |
3f2c31d9 | 501 | { |
9ab86bbc | 502 | struct page *page; |
3f2c31d9 | 503 | int err; |
3f2c31d9 | 504 | |
e9d7417b | 505 | page = get_a_page(rq, gfp); |
9ab86bbc SM |
506 | if (!page) |
507 | return -ENOMEM; | |
3f2c31d9 | 508 | |
e9d7417b | 509 | sg_init_one(rq->sg, page_address(page), PAGE_SIZE); |
3f2c31d9 | 510 | |
e9d7417b | 511 | err = virtqueue_add_buf(rq->vq, rq->sg, 0, 1, page, gfp); |
9ab86bbc | 512 | if (err < 0) |
e9d7417b | 513 | give_pages(rq, page); |
3f2c31d9 | 514 | |
9ab86bbc SM |
515 | return err; |
516 | } | |
3f2c31d9 | 517 | |
b2baed69 RR |
518 | /* |
519 | * Returns false if we couldn't fill entirely (OOM). | |
520 | * | |
521 | * Normally run in the receive path, but can also be run from ndo_open | |
522 | * before we're receiving packets, or from refill_work which is | |
523 | * careful to disable receiving (using napi_disable). | |
524 | */ | |
e9d7417b | 525 | static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 526 | { |
e9d7417b | 527 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc | 528 | int err; |
1788f495 | 529 | bool oom; |
3f2c31d9 | 530 | |
9ab86bbc SM |
531 | do { |
532 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 533 | err = add_recvbuf_mergeable(rq, gfp); |
9ab86bbc | 534 | else if (vi->big_packets) |
e9d7417b | 535 | err = add_recvbuf_big(rq, gfp); |
9ab86bbc | 536 | else |
e9d7417b | 537 | err = add_recvbuf_small(rq, gfp); |
3f2c31d9 | 538 | |
1788f495 | 539 | oom = err == -ENOMEM; |
9ed4cb07 | 540 | if (err) |
3f2c31d9 | 541 | break; |
e9d7417b | 542 | ++rq->num; |
b7dfde95 | 543 | } while (rq->vq->num_free); |
e9d7417b JW |
544 | if (unlikely(rq->num > rq->max)) |
545 | rq->max = rq->num; | |
546 | virtqueue_kick(rq->vq); | |
3161e453 | 547 | return !oom; |
3f2c31d9 MM |
548 | } |
549 | ||
18445c4d | 550 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
551 | { |
552 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 553 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 554 | |
18445c4d | 555 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 556 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 557 | virtqueue_disable_cb(rvq); |
e9d7417b | 558 | __napi_schedule(&rq->napi); |
18445c4d | 559 | } |
296f96fc RR |
560 | } |
561 | ||
e9d7417b | 562 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 563 | { |
e9d7417b | 564 | napi_enable(&rq->napi); |
3e9d08ec BR |
565 | |
566 | /* If all buffers were filled by other side before we napi_enabled, we | |
567 | * won't get another interrupt, so process any outstanding packets | |
568 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
569 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
570 | if (napi_schedule_prep(&rq->napi)) { |
571 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 572 | local_bh_disable(); |
e9d7417b | 573 | __napi_schedule(&rq->napi); |
ec13ee80 | 574 | local_bh_enable(); |
3e9d08ec BR |
575 | } |
576 | } | |
577 | ||
3161e453 RR |
578 | static void refill_work(struct work_struct *work) |
579 | { | |
e9d7417b JW |
580 | struct virtnet_info *vi = |
581 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 582 | bool still_empty; |
986a4f4d JW |
583 | int i; |
584 | ||
585 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
586 | struct receive_queue *rq = &vi->rq[i]; | |
3161e453 | 587 | |
986a4f4d JW |
588 | napi_disable(&rq->napi); |
589 | still_empty = !try_fill_recv(rq, GFP_KERNEL); | |
590 | virtnet_napi_enable(rq); | |
3161e453 | 591 | |
986a4f4d JW |
592 | /* In theory, this can happen: if we don't get any buffers in |
593 | * we will *never* try to fill again. | |
594 | */ | |
595 | if (still_empty) | |
596 | schedule_delayed_work(&vi->refill, HZ/2); | |
597 | } | |
3161e453 RR |
598 | } |
599 | ||
296f96fc RR |
600 | static int virtnet_poll(struct napi_struct *napi, int budget) |
601 | { | |
e9d7417b JW |
602 | struct receive_queue *rq = |
603 | container_of(napi, struct receive_queue, napi); | |
604 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
9ab86bbc | 605 | void *buf; |
296f96fc RR |
606 | unsigned int len, received = 0; |
607 | ||
608 | again: | |
609 | while (received < budget && | |
e9d7417b JW |
610 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
611 | receive_buf(rq, buf, len); | |
612 | --rq->num; | |
296f96fc RR |
613 | received++; |
614 | } | |
615 | ||
e9d7417b JW |
616 | if (rq->num < rq->max / 2) { |
617 | if (!try_fill_recv(rq, GFP_ATOMIC)) | |
3b07e9ca | 618 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 619 | } |
296f96fc | 620 | |
8329d98e RR |
621 | /* Out of packets? */ |
622 | if (received < budget) { | |
288379f0 | 623 | napi_complete(napi); |
e9d7417b | 624 | if (unlikely(!virtqueue_enable_cb(rq->vq)) && |
8e95a202 | 625 | napi_schedule_prep(napi)) { |
e9d7417b | 626 | virtqueue_disable_cb(rq->vq); |
288379f0 | 627 | __napi_schedule(napi); |
296f96fc | 628 | goto again; |
4265f161 | 629 | } |
296f96fc RR |
630 | } |
631 | ||
632 | return received; | |
633 | } | |
634 | ||
986a4f4d JW |
635 | static int virtnet_open(struct net_device *dev) |
636 | { | |
637 | struct virtnet_info *vi = netdev_priv(dev); | |
638 | int i; | |
639 | ||
640 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
641 | /* Make sure we have some buffers: if oom use wq. */ | |
642 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
643 | schedule_delayed_work(&vi->refill, 0); | |
644 | virtnet_napi_enable(&vi->rq[i]); | |
645 | } | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
b7dfde95 | 650 | static void free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
651 | { |
652 | struct sk_buff *skb; | |
6ee57bcc | 653 | unsigned int len; |
e9d7417b | 654 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 655 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 656 | |
e9d7417b | 657 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 658 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 659 | |
83a27052 | 660 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 661 | stats->tx_bytes += skb->len; |
662 | stats->tx_packets++; | |
83a27052 | 663 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 664 | |
ed79bab8 | 665 | dev_kfree_skb_any(skb); |
296f96fc RR |
666 | } |
667 | } | |
668 | ||
e9d7417b | 669 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 670 | { |
b3f24698 | 671 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); |
296f96fc | 672 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 673 | struct virtnet_info *vi = sq->vq->vdev->priv; |
7bedc7dc | 674 | unsigned num_sg; |
296f96fc | 675 | |
e174961c | 676 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
296f96fc | 677 | |
296f96fc | 678 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 679 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
55508d60 | 680 | hdr->hdr.csum_start = skb_checksum_start_offset(skb); |
b3f24698 | 681 | hdr->hdr.csum_offset = skb->csum_offset; |
296f96fc | 682 | } else { |
b3f24698 RR |
683 | hdr->hdr.flags = 0; |
684 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
685 | } |
686 | ||
687 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
688 | hdr->hdr.hdr_len = skb_headlen(skb); |
689 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 690 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 691 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 692 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 693 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 694 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 695 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
696 | else |
697 | BUG(); | |
34a48579 | 698 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 699 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 700 | } else { |
b3f24698 RR |
701 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
702 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
703 | } |
704 | ||
b3f24698 | 705 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 MM |
706 | |
707 | /* Encode metadata header at front. */ | |
708 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 709 | sg_set_buf(sq->sg, &hdr->mhdr, sizeof hdr->mhdr); |
3f2c31d9 | 710 | else |
e9d7417b | 711 | sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr); |
3f2c31d9 | 712 | |
b7dfde95 LT |
713 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; |
714 | return virtqueue_add_buf(sq->vq, sq->sg, num_sg, | |
f96fde41 | 715 | 0, skb, GFP_ATOMIC); |
11a3a154 RR |
716 | } |
717 | ||
424efe9c | 718 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
719 | { |
720 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
721 | int qnum = skb_get_queue_mapping(skb); |
722 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 723 | int err; |
2cb9c6ba | 724 | |
2cb9c6ba | 725 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 726 | free_old_xmit_skbs(sq); |
99ffc696 | 727 | |
03f191ba | 728 | /* Try to transmit */ |
b7dfde95 | 729 | err = xmit_skb(sq, skb); |
48925e37 | 730 | |
9ed4cb07 | 731 | /* This should not happen! */ |
0e3daa64 | 732 | if (unlikely(err)) { |
9ed4cb07 RR |
733 | dev->stats.tx_fifo_errors++; |
734 | if (net_ratelimit()) | |
735 | dev_warn(&dev->dev, | |
b7dfde95 | 736 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d RR |
737 | dev->stats.tx_dropped++; |
738 | kfree_skb(skb); | |
739 | return NETDEV_TX_OK; | |
296f96fc | 740 | } |
e9d7417b | 741 | virtqueue_kick(sq->vq); |
03f191ba | 742 | |
48925e37 RR |
743 | /* Don't wait up for transmitted skbs to be freed. */ |
744 | skb_orphan(skb); | |
745 | nf_reset(skb); | |
746 | ||
747 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
748 | * before it gets out of hand. Naturally, this wastes entries. */ | |
b7dfde95 | 749 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 750 | netif_stop_subqueue(dev, qnum); |
e9d7417b | 751 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 752 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
753 | free_old_xmit_skbs(sq); |
754 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 755 | netif_start_subqueue(dev, qnum); |
e9d7417b | 756 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
757 | } |
758 | } | |
99ffc696 | 759 | } |
48925e37 RR |
760 | |
761 | return NETDEV_TX_OK; | |
296f96fc RR |
762 | } |
763 | ||
40cbfc37 AK |
764 | /* |
765 | * Send command via the control virtqueue and check status. Commands | |
766 | * supported by the hypervisor, as indicated by feature bits, should | |
767 | * never fail unless improperly formated. | |
768 | */ | |
769 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
770 | struct scatterlist *data, int out, int in) | |
771 | { | |
772 | struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; | |
773 | struct virtio_net_ctrl_hdr ctrl; | |
774 | virtio_net_ctrl_ack status = ~0; | |
775 | unsigned int tmp; | |
776 | int i; | |
777 | ||
778 | /* Caller should know better */ | |
779 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || | |
780 | (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); | |
781 | ||
782 | out++; /* Add header */ | |
783 | in++; /* Add return status */ | |
784 | ||
785 | ctrl.class = class; | |
786 | ctrl.cmd = cmd; | |
787 | ||
788 | sg_init_table(sg, out + in); | |
789 | ||
790 | sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); | |
791 | for_each_sg(data, s, out + in - 2, i) | |
792 | sg_set_buf(&sg[i + 1], sg_virt(s), s->length); | |
793 | sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); | |
794 | ||
795 | BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0); | |
796 | ||
797 | virtqueue_kick(vi->cvq); | |
798 | ||
799 | /* Spin for a response, the kick causes an ioport write, trapping | |
800 | * into the hypervisor, so the request should be handled immediately. | |
801 | */ | |
802 | while (!virtqueue_get_buf(vi->cvq, &tmp)) | |
803 | cpu_relax(); | |
804 | ||
805 | return status == VIRTIO_NET_OK; | |
806 | } | |
807 | ||
9c46f6d4 AW |
808 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
809 | { | |
810 | struct virtnet_info *vi = netdev_priv(dev); | |
811 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 812 | int ret; |
7e58d5ae AK |
813 | struct sockaddr *addr = p; |
814 | struct scatterlist sg; | |
9c46f6d4 | 815 | |
7e58d5ae | 816 | ret = eth_prepare_mac_addr_change(dev, p); |
f2f2c8b4 JP |
817 | if (ret) |
818 | return ret; | |
9c46f6d4 | 819 | |
7e58d5ae AK |
820 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
821 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
822 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
823 | VIRTIO_NET_CTRL_MAC_ADDR_SET, | |
824 | &sg, 1, 0)) { | |
825 | dev_warn(&vdev->dev, | |
826 | "Failed to set mac address by vq command.\n"); | |
827 | return -EINVAL; | |
828 | } | |
829 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { | |
62994b2d | 830 | vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), |
7e58d5ae AK |
831 | addr->sa_data, dev->addr_len); |
832 | } | |
833 | ||
834 | eth_commit_mac_addr_change(dev, p); | |
9c46f6d4 AW |
835 | |
836 | return 0; | |
837 | } | |
838 | ||
3fa2a1df | 839 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
840 | struct rtnl_link_stats64 *tot) | |
841 | { | |
842 | struct virtnet_info *vi = netdev_priv(dev); | |
843 | int cpu; | |
844 | unsigned int start; | |
845 | ||
846 | for_each_possible_cpu(cpu) { | |
58472a76 | 847 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 848 | u64 tpackets, tbytes, rpackets, rbytes; |
849 | ||
850 | do { | |
e3906486 | 851 | start = u64_stats_fetch_begin_bh(&stats->tx_syncp); |
3fa2a1df | 852 | tpackets = stats->tx_packets; |
853 | tbytes = stats->tx_bytes; | |
e3906486 | 854 | } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start)); |
83a27052 ED |
855 | |
856 | do { | |
e3906486 | 857 | start = u64_stats_fetch_begin_bh(&stats->rx_syncp); |
3fa2a1df | 858 | rpackets = stats->rx_packets; |
859 | rbytes = stats->rx_bytes; | |
e3906486 | 860 | } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start)); |
3fa2a1df | 861 | |
862 | tot->rx_packets += rpackets; | |
863 | tot->tx_packets += tpackets; | |
864 | tot->rx_bytes += rbytes; | |
865 | tot->tx_bytes += tbytes; | |
866 | } | |
867 | ||
868 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 869 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 870 | tot->rx_dropped = dev->stats.rx_dropped; |
871 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
872 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
873 | ||
874 | return tot; | |
875 | } | |
876 | ||
da74e89d AS |
877 | #ifdef CONFIG_NET_POLL_CONTROLLER |
878 | static void virtnet_netpoll(struct net_device *dev) | |
879 | { | |
880 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 881 | int i; |
da74e89d | 882 | |
986a4f4d JW |
883 | for (i = 0; i < vi->curr_queue_pairs; i++) |
884 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
885 | } |
886 | #endif | |
887 | ||
586d17c5 JW |
888 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
889 | { | |
890 | rtnl_lock(); | |
891 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
892 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, | |
893 | 0, 0)) | |
894 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); | |
895 | rtnl_unlock(); | |
896 | } | |
897 | ||
986a4f4d JW |
898 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
899 | { | |
900 | struct scatterlist sg; | |
901 | struct virtio_net_ctrl_mq s; | |
902 | struct net_device *dev = vi->dev; | |
903 | ||
904 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
905 | return 0; | |
906 | ||
907 | s.virtqueue_pairs = queue_pairs; | |
908 | sg_init_one(&sg, &s, sizeof(s)); | |
909 | ||
910 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
911 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, 1, 0)){ | |
912 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", | |
913 | queue_pairs); | |
914 | return -EINVAL; | |
915 | } else | |
916 | vi->curr_queue_pairs = queue_pairs; | |
917 | ||
918 | return 0; | |
919 | } | |
920 | ||
296f96fc RR |
921 | static int virtnet_close(struct net_device *dev) |
922 | { | |
923 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 924 | int i; |
296f96fc | 925 | |
b2baed69 RR |
926 | /* Make sure refill_work doesn't re-enable napi! */ |
927 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d JW |
928 | |
929 | for (i = 0; i < vi->max_queue_pairs; i++) | |
930 | napi_disable(&vi->rq[i].napi); | |
296f96fc | 931 | |
296f96fc RR |
932 | return 0; |
933 | } | |
934 | ||
2af7698e AW |
935 | static void virtnet_set_rx_mode(struct net_device *dev) |
936 | { | |
937 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 938 | struct scatterlist sg[2]; |
2af7698e | 939 | u8 promisc, allmulti; |
f565a7c2 | 940 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 941 | struct netdev_hw_addr *ha; |
32e7bfc4 | 942 | int uc_count; |
4cd24eaf | 943 | int mc_count; |
f565a7c2 AW |
944 | void *buf; |
945 | int i; | |
2af7698e AW |
946 | |
947 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
948 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
949 | return; | |
950 | ||
f565a7c2 AW |
951 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
952 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 953 | |
23e258e1 | 954 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
955 | |
956 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
957 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f565a7c2 | 958 | sg, 1, 0)) |
2af7698e AW |
959 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
960 | promisc ? "en" : "dis"); | |
961 | ||
23e258e1 | 962 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
963 | |
964 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
965 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f565a7c2 | 966 | sg, 1, 0)) |
2af7698e AW |
967 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
968 | allmulti ? "en" : "dis"); | |
f565a7c2 | 969 | |
32e7bfc4 | 970 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 971 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 972 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
973 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
974 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
975 | mac_data = buf; | |
e68ed8f0 | 976 | if (!buf) |
f565a7c2 | 977 | return; |
f565a7c2 | 978 | |
23e258e1 AW |
979 | sg_init_table(sg, 2); |
980 | ||
f565a7c2 | 981 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 982 | mac_data->entries = uc_count; |
ccffad25 | 983 | i = 0; |
32e7bfc4 | 984 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 985 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
986 | |
987 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 988 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
989 | |
990 | /* multicast list and count fill the end */ | |
32e7bfc4 | 991 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 992 | |
4cd24eaf | 993 | mac_data->entries = mc_count; |
567ec874 | 994 | i = 0; |
22bedad3 JP |
995 | netdev_for_each_mc_addr(ha, dev) |
996 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
997 | |
998 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 999 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1000 | |
1001 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
1002 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
1003 | sg, 2, 0)) | |
1004 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); | |
1005 | ||
1006 | kfree(buf); | |
2af7698e AW |
1007 | } |
1008 | ||
8e586137 | 1009 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
1010 | { |
1011 | struct virtnet_info *vi = netdev_priv(dev); | |
1012 | struct scatterlist sg; | |
1013 | ||
23e258e1 | 1014 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1015 | |
1016 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
1017 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) | |
1018 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); | |
8e586137 | 1019 | return 0; |
0bde9569 AW |
1020 | } |
1021 | ||
8e586137 | 1022 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) |
0bde9569 AW |
1023 | { |
1024 | struct virtnet_info *vi = netdev_priv(dev); | |
1025 | struct scatterlist sg; | |
1026 | ||
23e258e1 | 1027 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1028 | |
1029 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
1030 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) | |
1031 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); | |
8e586137 | 1032 | return 0; |
0bde9569 AW |
1033 | } |
1034 | ||
8898c21c | 1035 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
986a4f4d JW |
1036 | { |
1037 | int i; | |
47be2479 | 1038 | int cpu; |
986a4f4d | 1039 | |
8898c21c WG |
1040 | if (vi->affinity_hint_set) { |
1041 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
47be2479 WG |
1042 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
1043 | virtqueue_set_affinity(vi->sq[i].vq, -1); | |
1044 | } | |
1045 | ||
8898c21c WG |
1046 | vi->affinity_hint_set = false; |
1047 | } | |
1048 | ||
1049 | i = 0; | |
1050 | for_each_online_cpu(cpu) { | |
1051 | if (cpu == hcpu) { | |
1052 | *per_cpu_ptr(vi->vq_index, cpu) = -1; | |
1053 | } else { | |
47be2479 WG |
1054 | *per_cpu_ptr(vi->vq_index, cpu) = |
1055 | ++i % vi->curr_queue_pairs; | |
8898c21c WG |
1056 | } |
1057 | } | |
1058 | } | |
47be2479 | 1059 | |
8898c21c WG |
1060 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1061 | { | |
1062 | int i; | |
1063 | int cpu; | |
986a4f4d JW |
1064 | |
1065 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1066 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1067 | * setting the affinity hint to eliminate the contention. | |
1068 | */ | |
8898c21c WG |
1069 | if (vi->curr_queue_pairs == 1 || |
1070 | vi->max_queue_pairs != num_online_cpus()) { | |
1071 | virtnet_clean_affinity(vi, -1); | |
1072 | return; | |
986a4f4d JW |
1073 | } |
1074 | ||
8898c21c WG |
1075 | i = 0; |
1076 | for_each_online_cpu(cpu) { | |
986a4f4d JW |
1077 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
1078 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
8898c21c WG |
1079 | *per_cpu_ptr(vi->vq_index, cpu) = i; |
1080 | i++; | |
986a4f4d JW |
1081 | } |
1082 | ||
8898c21c | 1083 | vi->affinity_hint_set = true; |
986a4f4d JW |
1084 | } |
1085 | ||
8de4b2f3 WG |
1086 | static int virtnet_cpu_callback(struct notifier_block *nfb, |
1087 | unsigned long action, void *hcpu) | |
1088 | { | |
1089 | struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); | |
1090 | ||
1091 | switch(action & ~CPU_TASKS_FROZEN) { | |
1092 | case CPU_ONLINE: | |
1093 | case CPU_DOWN_FAILED: | |
1094 | case CPU_DEAD: | |
1095 | virtnet_set_affinity(vi); | |
1096 | break; | |
1097 | case CPU_DOWN_PREPARE: | |
1098 | virtnet_clean_affinity(vi, (long)hcpu); | |
1099 | break; | |
1100 | default: | |
1101 | break; | |
1102 | } | |
1103 | return NOTIFY_OK; | |
986a4f4d JW |
1104 | } |
1105 | ||
8f9f4668 RJ |
1106 | static void virtnet_get_ringparam(struct net_device *dev, |
1107 | struct ethtool_ringparam *ring) | |
1108 | { | |
1109 | struct virtnet_info *vi = netdev_priv(dev); | |
1110 | ||
986a4f4d JW |
1111 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1112 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1113 | ring->rx_pending = ring->rx_max_pending; |
1114 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1115 | } |
1116 | ||
66846048 RJ |
1117 | |
1118 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1119 | struct ethtool_drvinfo *info) | |
1120 | { | |
1121 | struct virtnet_info *vi = netdev_priv(dev); | |
1122 | struct virtio_device *vdev = vi->vdev; | |
1123 | ||
1124 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1125 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1126 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1127 | ||
1128 | } | |
1129 | ||
d73bcd2c JW |
1130 | /* TODO: Eliminate OOO packets during switching */ |
1131 | static int virtnet_set_channels(struct net_device *dev, | |
1132 | struct ethtool_channels *channels) | |
1133 | { | |
1134 | struct virtnet_info *vi = netdev_priv(dev); | |
1135 | u16 queue_pairs = channels->combined_count; | |
1136 | int err; | |
1137 | ||
1138 | /* We don't support separate rx/tx channels. | |
1139 | * We don't allow setting 'other' channels. | |
1140 | */ | |
1141 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1142 | return -EINVAL; | |
1143 | ||
1144 | if (queue_pairs > vi->max_queue_pairs) | |
1145 | return -EINVAL; | |
1146 | ||
47be2479 | 1147 | get_online_cpus(); |
d73bcd2c JW |
1148 | err = virtnet_set_queues(vi, queue_pairs); |
1149 | if (!err) { | |
1150 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1151 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1152 | ||
8898c21c | 1153 | virtnet_set_affinity(vi); |
d73bcd2c | 1154 | } |
47be2479 | 1155 | put_online_cpus(); |
d73bcd2c JW |
1156 | |
1157 | return err; | |
1158 | } | |
1159 | ||
1160 | static void virtnet_get_channels(struct net_device *dev, | |
1161 | struct ethtool_channels *channels) | |
1162 | { | |
1163 | struct virtnet_info *vi = netdev_priv(dev); | |
1164 | ||
1165 | channels->combined_count = vi->curr_queue_pairs; | |
1166 | channels->max_combined = vi->max_queue_pairs; | |
1167 | channels->max_other = 0; | |
1168 | channels->rx_count = 0; | |
1169 | channels->tx_count = 0; | |
1170 | channels->other_count = 0; | |
1171 | } | |
1172 | ||
0fc0b732 | 1173 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1174 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1175 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1176 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1177 | .set_channels = virtnet_set_channels, |
1178 | .get_channels = virtnet_get_channels, | |
a9ea3fc6 HX |
1179 | }; |
1180 | ||
39da5814 MM |
1181 | #define MIN_MTU 68 |
1182 | #define MAX_MTU 65535 | |
1183 | ||
1184 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
1185 | { | |
1186 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
1187 | return -EINVAL; | |
1188 | dev->mtu = new_mtu; | |
1189 | return 0; | |
1190 | } | |
1191 | ||
986a4f4d JW |
1192 | /* To avoid contending a lock hold by a vcpu who would exit to host, select the |
1193 | * txq based on the processor id. | |
986a4f4d JW |
1194 | */ |
1195 | static u16 virtnet_select_queue(struct net_device *dev, struct sk_buff *skb) | |
1196 | { | |
47be2479 WG |
1197 | int txq; |
1198 | struct virtnet_info *vi = netdev_priv(dev); | |
1199 | ||
1200 | if (skb_rx_queue_recorded(skb)) { | |
1201 | txq = skb_get_rx_queue(skb); | |
1202 | } else { | |
1203 | txq = *__this_cpu_ptr(vi->vq_index); | |
1204 | if (txq == -1) | |
1205 | txq = 0; | |
1206 | } | |
986a4f4d JW |
1207 | |
1208 | while (unlikely(txq >= dev->real_num_tx_queues)) | |
1209 | txq -= dev->real_num_tx_queues; | |
1210 | ||
1211 | return txq; | |
1212 | } | |
1213 | ||
76288b4e SH |
1214 | static const struct net_device_ops virtnet_netdev = { |
1215 | .ndo_open = virtnet_open, | |
1216 | .ndo_stop = virtnet_close, | |
1217 | .ndo_start_xmit = start_xmit, | |
1218 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1219 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1220 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 1221 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 1222 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1223 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1224 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
986a4f4d | 1225 | .ndo_select_queue = virtnet_select_queue, |
76288b4e SH |
1226 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1227 | .ndo_poll_controller = virtnet_netpoll, | |
1228 | #endif | |
1229 | }; | |
1230 | ||
586d17c5 | 1231 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1232 | { |
586d17c5 JW |
1233 | struct virtnet_info *vi = |
1234 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1235 | u16 v; |
1236 | ||
586d17c5 JW |
1237 | mutex_lock(&vi->config_lock); |
1238 | if (!vi->config_enable) | |
1239 | goto done; | |
1240 | ||
77dd7693 | 1241 | if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS, |
9f4d26d0 | 1242 | offsetof(struct virtio_net_config, status), |
77dd7693 | 1243 | &v) < 0) |
586d17c5 JW |
1244 | goto done; |
1245 | ||
1246 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1247 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1248 | virtnet_ack_link_announce(vi); |
1249 | } | |
9f4d26d0 MM |
1250 | |
1251 | /* Ignore unknown (future) status bits */ | |
1252 | v &= VIRTIO_NET_S_LINK_UP; | |
1253 | ||
1254 | if (vi->status == v) | |
586d17c5 | 1255 | goto done; |
9f4d26d0 MM |
1256 | |
1257 | vi->status = v; | |
1258 | ||
1259 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1260 | netif_carrier_on(vi->dev); | |
986a4f4d | 1261 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
1262 | } else { |
1263 | netif_carrier_off(vi->dev); | |
986a4f4d | 1264 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 | 1265 | } |
586d17c5 JW |
1266 | done: |
1267 | mutex_unlock(&vi->config_lock); | |
9f4d26d0 MM |
1268 | } |
1269 | ||
1270 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1271 | { | |
1272 | struct virtnet_info *vi = vdev->priv; | |
1273 | ||
3b07e9ca | 1274 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1275 | } |
1276 | ||
986a4f4d JW |
1277 | static void virtnet_free_queues(struct virtnet_info *vi) |
1278 | { | |
1279 | kfree(vi->rq); | |
1280 | kfree(vi->sq); | |
1281 | } | |
1282 | ||
1283 | static void free_receive_bufs(struct virtnet_info *vi) | |
1284 | { | |
1285 | int i; | |
1286 | ||
1287 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1288 | while (vi->rq[i].pages) | |
1289 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
1290 | } | |
1291 | } | |
1292 | ||
1293 | static void free_unused_bufs(struct virtnet_info *vi) | |
1294 | { | |
1295 | void *buf; | |
1296 | int i; | |
1297 | ||
1298 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1299 | struct virtqueue *vq = vi->sq[i].vq; | |
1300 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) | |
1301 | dev_kfree_skb(buf); | |
1302 | } | |
1303 | ||
1304 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1305 | struct virtqueue *vq = vi->rq[i].vq; | |
1306 | ||
1307 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
1308 | if (vi->mergeable_rx_bufs || vi->big_packets) | |
1309 | give_pages(&vi->rq[i], buf); | |
1310 | else | |
1311 | dev_kfree_skb(buf); | |
1312 | --vi->rq[i].num; | |
1313 | } | |
1314 | BUG_ON(vi->rq[i].num != 0); | |
1315 | } | |
1316 | } | |
1317 | ||
e9d7417b JW |
1318 | static void virtnet_del_vqs(struct virtnet_info *vi) |
1319 | { | |
1320 | struct virtio_device *vdev = vi->vdev; | |
1321 | ||
8898c21c | 1322 | virtnet_clean_affinity(vi, -1); |
986a4f4d | 1323 | |
e9d7417b | 1324 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
1325 | |
1326 | virtnet_free_queues(vi); | |
e9d7417b JW |
1327 | } |
1328 | ||
986a4f4d | 1329 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 1330 | { |
986a4f4d JW |
1331 | vq_callback_t **callbacks; |
1332 | struct virtqueue **vqs; | |
1333 | int ret = -ENOMEM; | |
1334 | int i, total_vqs; | |
1335 | const char **names; | |
1336 | ||
1337 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
1338 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
1339 | * possible control vq. | |
1340 | */ | |
1341 | total_vqs = vi->max_queue_pairs * 2 + | |
1342 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
1343 | ||
1344 | /* Allocate space for find_vqs parameters */ | |
1345 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
1346 | if (!vqs) | |
1347 | goto err_vq; | |
1348 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
1349 | if (!callbacks) | |
1350 | goto err_callback; | |
1351 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
1352 | if (!names) | |
1353 | goto err_names; | |
1354 | ||
1355 | /* Parameters for control virtqueue, if any */ | |
1356 | if (vi->has_cvq) { | |
1357 | callbacks[total_vqs - 1] = NULL; | |
1358 | names[total_vqs - 1] = "control"; | |
1359 | } | |
3f9c10b0 | 1360 | |
986a4f4d JW |
1361 | /* Allocate/initialize parameters for send/receive virtqueues */ |
1362 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1363 | callbacks[rxq2vq(i)] = skb_recv_done; | |
1364 | callbacks[txq2vq(i)] = skb_xmit_done; | |
1365 | sprintf(vi->rq[i].name, "input.%d", i); | |
1366 | sprintf(vi->sq[i].name, "output.%d", i); | |
1367 | names[rxq2vq(i)] = vi->rq[i].name; | |
1368 | names[txq2vq(i)] = vi->sq[i].name; | |
1369 | } | |
3f9c10b0 | 1370 | |
986a4f4d JW |
1371 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
1372 | names); | |
1373 | if (ret) | |
1374 | goto err_find; | |
3f9c10b0 | 1375 | |
986a4f4d JW |
1376 | if (vi->has_cvq) { |
1377 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 AS |
1378 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
1379 | vi->dev->features |= NETIF_F_HW_VLAN_FILTER; | |
1380 | } | |
986a4f4d JW |
1381 | |
1382 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1383 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
1384 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
1385 | } | |
1386 | ||
1387 | kfree(names); | |
1388 | kfree(callbacks); | |
1389 | kfree(vqs); | |
1390 | ||
3f9c10b0 | 1391 | return 0; |
986a4f4d JW |
1392 | |
1393 | err_find: | |
1394 | kfree(names); | |
1395 | err_names: | |
1396 | kfree(callbacks); | |
1397 | err_callback: | |
1398 | kfree(vqs); | |
1399 | err_vq: | |
1400 | return ret; | |
1401 | } | |
1402 | ||
1403 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
1404 | { | |
1405 | int i; | |
1406 | ||
1407 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
1408 | if (!vi->sq) | |
1409 | goto err_sq; | |
1410 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 1411 | if (!vi->rq) |
986a4f4d JW |
1412 | goto err_rq; |
1413 | ||
1414 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
1415 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1416 | vi->rq[i].pages = NULL; | |
1417 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
1418 | napi_weight); | |
1419 | ||
1420 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
1421 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); | |
1422 | } | |
1423 | ||
1424 | return 0; | |
1425 | ||
1426 | err_rq: | |
1427 | kfree(vi->sq); | |
1428 | err_sq: | |
1429 | return -ENOMEM; | |
1430 | } | |
1431 | ||
1432 | static int init_vqs(struct virtnet_info *vi) | |
1433 | { | |
1434 | int ret; | |
1435 | ||
1436 | /* Allocate send & receive queues */ | |
1437 | ret = virtnet_alloc_queues(vi); | |
1438 | if (ret) | |
1439 | goto err; | |
1440 | ||
1441 | ret = virtnet_find_vqs(vi); | |
1442 | if (ret) | |
1443 | goto err_free; | |
1444 | ||
47be2479 | 1445 | get_online_cpus(); |
8898c21c | 1446 | virtnet_set_affinity(vi); |
47be2479 WG |
1447 | put_online_cpus(); |
1448 | ||
986a4f4d JW |
1449 | return 0; |
1450 | ||
1451 | err_free: | |
1452 | virtnet_free_queues(vi); | |
1453 | err: | |
1454 | return ret; | |
3f9c10b0 AS |
1455 | } |
1456 | ||
296f96fc RR |
1457 | static int virtnet_probe(struct virtio_device *vdev) |
1458 | { | |
986a4f4d | 1459 | int i, err; |
296f96fc RR |
1460 | struct net_device *dev; |
1461 | struct virtnet_info *vi; | |
986a4f4d JW |
1462 | u16 max_queue_pairs; |
1463 | ||
1464 | /* Find if host supports multiqueue virtio_net device */ | |
1465 | err = virtio_config_val(vdev, VIRTIO_NET_F_MQ, | |
1466 | offsetof(struct virtio_net_config, | |
1467 | max_virtqueue_pairs), &max_queue_pairs); | |
1468 | ||
1469 | /* We need at least 2 queue's */ | |
1470 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
1471 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
1472 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
1473 | max_queue_pairs = 1; | |
296f96fc RR |
1474 | |
1475 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 1476 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
1477 | if (!dev) |
1478 | return -ENOMEM; | |
1479 | ||
1480 | /* Set up network device as normal. */ | |
f2f2c8b4 | 1481 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 1482 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1483 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1484 | |
a9ea3fc6 | 1485 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
1486 | SET_NETDEV_DEV(dev, &vdev->dev); |
1487 | ||
1488 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1489 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1490 | /* This opens up the world of extra features. */ |
98e778c9 MM |
1491 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
1492 | if (csum) | |
1493 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1494 | ||
1495 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
1496 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO | |
34a48579 RR |
1497 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1498 | } | |
5539ae96 | 1499 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1500 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1501 | dev->hw_features |= NETIF_F_TSO; | |
1502 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1503 | dev->hw_features |= NETIF_F_TSO6; | |
1504 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1505 | dev->hw_features |= NETIF_F_TSO_ECN; | |
1506 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) | |
1507 | dev->hw_features |= NETIF_F_UFO; | |
1508 | ||
1509 | if (gso) | |
1510 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); | |
1511 | /* (!csum && gso) case will be fixed by register_netdev() */ | |
296f96fc RR |
1512 | } |
1513 | ||
4fda8302 JW |
1514 | dev->vlan_features = dev->features; |
1515 | ||
296f96fc | 1516 | /* Configuration may specify what MAC to use. Otherwise random. */ |
77dd7693 | 1517 | if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC, |
a586d4f6 | 1518 | offsetof(struct virtio_net_config, mac), |
77dd7693 | 1519 | dev->dev_addr, dev->addr_len) < 0) |
f2cedb63 | 1520 | eth_hw_addr_random(dev); |
296f96fc RR |
1521 | |
1522 | /* Set up our device-specific information */ | |
1523 | vi = netdev_priv(dev); | |
296f96fc RR |
1524 | vi->dev = dev; |
1525 | vi->vdev = vdev; | |
d9d5dcc8 | 1526 | vdev->priv = vi; |
3fa2a1df | 1527 | vi->stats = alloc_percpu(struct virtnet_stats); |
1528 | err = -ENOMEM; | |
1529 | if (vi->stats == NULL) | |
1530 | goto free; | |
1531 | ||
47be2479 WG |
1532 | vi->vq_index = alloc_percpu(int); |
1533 | if (vi->vq_index == NULL) | |
1534 | goto free_stats; | |
1535 | ||
586d17c5 JW |
1536 | mutex_init(&vi->config_lock); |
1537 | vi->config_enable = true; | |
1538 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); | |
296f96fc | 1539 | |
97402b96 | 1540 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1541 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1542 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
1543 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
97402b96 HX |
1544 | vi->big_packets = true; |
1545 | ||
3f2c31d9 MM |
1546 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1547 | vi->mergeable_rx_bufs = true; | |
1548 | ||
986a4f4d JW |
1549 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
1550 | vi->has_cvq = true; | |
1551 | ||
1552 | /* Use single tx/rx queue pair as default */ | |
1553 | vi->curr_queue_pairs = 1; | |
1554 | vi->max_queue_pairs = max_queue_pairs; | |
1555 | ||
1556 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 1557 | err = init_vqs(vi); |
d2a7ddda | 1558 | if (err) |
47be2479 | 1559 | goto free_index; |
296f96fc | 1560 | |
986a4f4d JW |
1561 | netif_set_real_num_tx_queues(dev, 1); |
1562 | netif_set_real_num_rx_queues(dev, 1); | |
1563 | ||
296f96fc RR |
1564 | err = register_netdev(dev); |
1565 | if (err) { | |
1566 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1567 | goto free_vqs; |
296f96fc | 1568 | } |
b3369c1f RR |
1569 | |
1570 | /* Last of all, set up some receive buffers. */ | |
986a4f4d JW |
1571 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1572 | try_fill_recv(&vi->rq[i], GFP_KERNEL); | |
1573 | ||
1574 | /* If we didn't even get one input buffer, we're useless. */ | |
1575 | if (vi->rq[i].num == 0) { | |
1576 | free_unused_bufs(vi); | |
1577 | err = -ENOMEM; | |
1578 | goto free_recv_bufs; | |
1579 | } | |
b3369c1f RR |
1580 | } |
1581 | ||
8de4b2f3 WG |
1582 | vi->nb.notifier_call = &virtnet_cpu_callback; |
1583 | err = register_hotcpu_notifier(&vi->nb); | |
1584 | if (err) { | |
1585 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
1586 | goto free_recv_bufs; | |
1587 | } | |
1588 | ||
167c25e4 JW |
1589 | /* Assume link up if device can't report link status, |
1590 | otherwise get link status from config. */ | |
1591 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1592 | netif_carrier_off(dev); | |
3b07e9ca | 1593 | schedule_work(&vi->config_work); |
167c25e4 JW |
1594 | } else { |
1595 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1596 | netif_carrier_on(dev); | |
1597 | } | |
9f4d26d0 | 1598 | |
986a4f4d JW |
1599 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
1600 | dev->name, max_queue_pairs); | |
1601 | ||
296f96fc RR |
1602 | return 0; |
1603 | ||
986a4f4d JW |
1604 | free_recv_bufs: |
1605 | free_receive_bufs(vi); | |
b3369c1f | 1606 | unregister_netdev(dev); |
d2a7ddda | 1607 | free_vqs: |
986a4f4d | 1608 | cancel_delayed_work_sync(&vi->refill); |
e9d7417b | 1609 | virtnet_del_vqs(vi); |
47be2479 WG |
1610 | free_index: |
1611 | free_percpu(vi->vq_index); | |
3fa2a1df | 1612 | free_stats: |
1613 | free_percpu(vi->stats); | |
296f96fc RR |
1614 | free: |
1615 | free_netdev(dev); | |
1616 | return err; | |
1617 | } | |
1618 | ||
04486ed0 | 1619 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1620 | { |
04486ed0 | 1621 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1622 | |
1623 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1624 | free_unused_bufs(vi); |
fb6813f4 | 1625 | |
986a4f4d | 1626 | free_receive_bufs(vi); |
d2a7ddda | 1627 | |
986a4f4d | 1628 | virtnet_del_vqs(vi); |
04486ed0 AS |
1629 | } |
1630 | ||
8cc085d6 | 1631 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
1632 | { |
1633 | struct virtnet_info *vi = vdev->priv; | |
1634 | ||
8de4b2f3 WG |
1635 | unregister_hotcpu_notifier(&vi->nb); |
1636 | ||
586d17c5 JW |
1637 | /* Prevent config work handler from accessing the device. */ |
1638 | mutex_lock(&vi->config_lock); | |
1639 | vi->config_enable = false; | |
1640 | mutex_unlock(&vi->config_lock); | |
1641 | ||
04486ed0 AS |
1642 | unregister_netdev(vi->dev); |
1643 | ||
1644 | remove_vq_common(vi); | |
fb6813f4 | 1645 | |
586d17c5 JW |
1646 | flush_work(&vi->config_work); |
1647 | ||
47be2479 | 1648 | free_percpu(vi->vq_index); |
2e66f55b | 1649 | free_percpu(vi->stats); |
74b2553f | 1650 | free_netdev(vi->dev); |
296f96fc RR |
1651 | } |
1652 | ||
0741bcb5 AS |
1653 | #ifdef CONFIG_PM |
1654 | static int virtnet_freeze(struct virtio_device *vdev) | |
1655 | { | |
1656 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1657 | int i; |
0741bcb5 | 1658 | |
586d17c5 JW |
1659 | /* Prevent config work handler from accessing the device */ |
1660 | mutex_lock(&vi->config_lock); | |
1661 | vi->config_enable = false; | |
1662 | mutex_unlock(&vi->config_lock); | |
1663 | ||
0741bcb5 AS |
1664 | netif_device_detach(vi->dev); |
1665 | cancel_delayed_work_sync(&vi->refill); | |
1666 | ||
1667 | if (netif_running(vi->dev)) | |
986a4f4d JW |
1668 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1669 | napi_disable(&vi->rq[i].napi); | |
1670 | netif_napi_del(&vi->rq[i].napi); | |
1671 | } | |
0741bcb5 AS |
1672 | |
1673 | remove_vq_common(vi); | |
1674 | ||
586d17c5 JW |
1675 | flush_work(&vi->config_work); |
1676 | ||
0741bcb5 AS |
1677 | return 0; |
1678 | } | |
1679 | ||
1680 | static int virtnet_restore(struct virtio_device *vdev) | |
1681 | { | |
1682 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1683 | int err, i; |
0741bcb5 AS |
1684 | |
1685 | err = init_vqs(vi); | |
1686 | if (err) | |
1687 | return err; | |
1688 | ||
1689 | if (netif_running(vi->dev)) | |
986a4f4d JW |
1690 | for (i = 0; i < vi->max_queue_pairs; i++) |
1691 | virtnet_napi_enable(&vi->rq[i]); | |
0741bcb5 AS |
1692 | |
1693 | netif_device_attach(vi->dev); | |
1694 | ||
986a4f4d JW |
1695 | for (i = 0; i < vi->max_queue_pairs; i++) |
1696 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
1697 | schedule_delayed_work(&vi->refill, 0); | |
0741bcb5 | 1698 | |
586d17c5 JW |
1699 | mutex_lock(&vi->config_lock); |
1700 | vi->config_enable = true; | |
1701 | mutex_unlock(&vi->config_lock); | |
1702 | ||
986a4f4d JW |
1703 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
1704 | ||
0741bcb5 AS |
1705 | return 0; |
1706 | } | |
1707 | #endif | |
1708 | ||
296f96fc RR |
1709 | static struct virtio_device_id id_table[] = { |
1710 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1711 | { 0 }, | |
1712 | }; | |
1713 | ||
c45a6816 | 1714 | static unsigned int features[] = { |
5e4fe5c4 MM |
1715 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1716 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1717 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1718 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1719 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1720 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1721 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
986a4f4d | 1722 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, |
7e58d5ae | 1723 | VIRTIO_NET_F_CTRL_MAC_ADDR, |
c45a6816 RR |
1724 | }; |
1725 | ||
22402529 | 1726 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1727 | .feature_table = features, |
1728 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1729 | .driver.name = KBUILD_MODNAME, |
1730 | .driver.owner = THIS_MODULE, | |
1731 | .id_table = id_table, | |
1732 | .probe = virtnet_probe, | |
8cc085d6 | 1733 | .remove = virtnet_remove, |
9f4d26d0 | 1734 | .config_changed = virtnet_config_changed, |
0741bcb5 AS |
1735 | #ifdef CONFIG_PM |
1736 | .freeze = virtnet_freeze, | |
1737 | .restore = virtnet_restore, | |
1738 | #endif | |
296f96fc RR |
1739 | }; |
1740 | ||
b2a17029 | 1741 | module_virtio_driver(virtio_net_driver); |
296f96fc RR |
1742 | |
1743 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1744 | MODULE_DESCRIPTION("Virtio network driver"); | |
1745 | MODULE_LICENSE("GPL"); |