Commit | Line | Data |
---|---|---|
48925e37 | 1 | /* A network driver using virtio. |
296f96fc RR |
2 | * |
3 | * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | //#define DEBUG | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 22 | #include <linux/ethtool.h> |
296f96fc RR |
23 | #include <linux/module.h> |
24 | #include <linux/virtio.h> | |
25 | #include <linux/virtio_net.h> | |
26 | #include <linux/scatterlist.h> | |
e918085a | 27 | #include <linux/if_vlan.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
8de4b2f3 | 29 | #include <linux/cpu.h> |
296f96fc | 30 | |
d34710e3 | 31 | static int napi_weight = NAPI_POLL_WEIGHT; |
6c0cd7c0 DL |
32 | module_param(napi_weight, int, 0444); |
33 | ||
eb939922 | 34 | static bool csum = true, gso = true; |
34a48579 RR |
35 | module_param(csum, bool, 0444); |
36 | module_param(gso, bool, 0444); | |
37 | ||
296f96fc | 38 | /* FIXME: MTU in config. */ |
e918085a | 39 | #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 40 | #define GOOD_COPY_LEN 128 |
296f96fc | 41 | |
66846048 | 42 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 43 | |
3fa2a1df | 44 | struct virtnet_stats { |
83a27052 ED |
45 | struct u64_stats_sync tx_syncp; |
46 | struct u64_stats_sync rx_syncp; | |
3fa2a1df | 47 | u64 tx_bytes; |
48 | u64 tx_packets; | |
49 | ||
50 | u64 rx_bytes; | |
51 | u64 rx_packets; | |
52 | }; | |
53 | ||
e9d7417b JW |
54 | /* Internal representation of a send virtqueue */ |
55 | struct send_queue { | |
56 | /* Virtqueue associated with this send _queue */ | |
57 | struct virtqueue *vq; | |
58 | ||
59 | /* TX: fragments + linear part + virtio header */ | |
60 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
61 | |
62 | /* Name of the send queue: output.$index */ | |
63 | char name[40]; | |
e9d7417b JW |
64 | }; |
65 | ||
66 | /* Internal representation of a receive virtqueue */ | |
67 | struct receive_queue { | |
68 | /* Virtqueue associated with this receive_queue */ | |
69 | struct virtqueue *vq; | |
70 | ||
296f96fc RR |
71 | struct napi_struct napi; |
72 | ||
73 | /* Number of input buffers, and max we've ever had. */ | |
74 | unsigned int num, max; | |
75 | ||
e9d7417b JW |
76 | /* Chain pages by the private ptr. */ |
77 | struct page *pages; | |
78 | ||
79 | /* RX: fragments + linear part + virtio header */ | |
80 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
81 | |
82 | /* Name of this receive queue: input.$index */ | |
83 | char name[40]; | |
e9d7417b JW |
84 | }; |
85 | ||
86 | struct virtnet_info { | |
87 | struct virtio_device *vdev; | |
88 | struct virtqueue *cvq; | |
89 | struct net_device *dev; | |
986a4f4d JW |
90 | struct send_queue *sq; |
91 | struct receive_queue *rq; | |
e9d7417b JW |
92 | unsigned int status; |
93 | ||
986a4f4d JW |
94 | /* Max # of queue pairs supported by the device */ |
95 | u16 max_queue_pairs; | |
96 | ||
97 | /* # of queue pairs currently used by the driver */ | |
98 | u16 curr_queue_pairs; | |
99 | ||
97402b96 HX |
100 | /* I like... big packets and I cannot lie! */ |
101 | bool big_packets; | |
102 | ||
3f2c31d9 MM |
103 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
104 | bool mergeable_rx_bufs; | |
105 | ||
986a4f4d JW |
106 | /* Has control virtqueue */ |
107 | bool has_cvq; | |
108 | ||
e7428e95 MT |
109 | /* Host can handle any s/g split between our header and packet data */ |
110 | bool any_header_sg; | |
111 | ||
586d17c5 JW |
112 | /* enable config space updates */ |
113 | bool config_enable; | |
114 | ||
3fa2a1df | 115 | /* Active statistics */ |
116 | struct virtnet_stats __percpu *stats; | |
117 | ||
3161e453 RR |
118 | /* Work struct for refilling if we run low on memory. */ |
119 | struct delayed_work refill; | |
120 | ||
586d17c5 JW |
121 | /* Work struct for config space updates */ |
122 | struct work_struct config_work; | |
123 | ||
124 | /* Lock for config space updates */ | |
125 | struct mutex config_lock; | |
986a4f4d | 126 | |
2613af0e MD |
127 | /* Page_frag for GFP_KERNEL packet buffer allocation when we run |
128 | * low on memory. | |
129 | */ | |
130 | struct page_frag alloc_frag; | |
131 | ||
986a4f4d JW |
132 | /* Does the affinity hint is set for virtqueues? */ |
133 | bool affinity_hint_set; | |
47be2479 | 134 | |
8de4b2f3 WG |
135 | /* CPU hot plug notifier */ |
136 | struct notifier_block nb; | |
296f96fc RR |
137 | }; |
138 | ||
b3f24698 RR |
139 | struct skb_vnet_hdr { |
140 | union { | |
141 | struct virtio_net_hdr hdr; | |
142 | struct virtio_net_hdr_mrg_rxbuf mhdr; | |
143 | }; | |
144 | }; | |
145 | ||
9ab86bbc SM |
146 | struct padded_vnet_hdr { |
147 | struct virtio_net_hdr hdr; | |
148 | /* | |
149 | * virtio_net_hdr should be in a separated sg buffer because of a | |
150 | * QEMU bug, and data sg buffer shares same page with this header sg. | |
151 | * This padding makes next sg 16 byte aligned after virtio_net_hdr. | |
152 | */ | |
153 | char padding[6]; | |
154 | }; | |
155 | ||
986a4f4d JW |
156 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
157 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
158 | */ | |
159 | static int vq2txq(struct virtqueue *vq) | |
160 | { | |
9d0ca6ed | 161 | return (vq->index - 1) / 2; |
986a4f4d JW |
162 | } |
163 | ||
164 | static int txq2vq(int txq) | |
165 | { | |
166 | return txq * 2 + 1; | |
167 | } | |
168 | ||
169 | static int vq2rxq(struct virtqueue *vq) | |
170 | { | |
9d0ca6ed | 171 | return vq->index / 2; |
986a4f4d JW |
172 | } |
173 | ||
174 | static int rxq2vq(int rxq) | |
175 | { | |
176 | return rxq * 2; | |
177 | } | |
178 | ||
b3f24698 | 179 | static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 180 | { |
b3f24698 | 181 | return (struct skb_vnet_hdr *)skb->cb; |
296f96fc RR |
182 | } |
183 | ||
9ab86bbc SM |
184 | /* |
185 | * private is used to chain pages for big packets, put the whole | |
186 | * most recent used list in the beginning for reuse | |
187 | */ | |
e9d7417b | 188 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 189 | { |
9ab86bbc | 190 | struct page *end; |
0a888fd1 | 191 | |
e9d7417b | 192 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 193 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
194 | end->private = (unsigned long)rq->pages; |
195 | rq->pages = page; | |
0a888fd1 MM |
196 | } |
197 | ||
e9d7417b | 198 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 199 | { |
e9d7417b | 200 | struct page *p = rq->pages; |
fb6813f4 | 201 | |
9ab86bbc | 202 | if (p) { |
e9d7417b | 203 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
204 | /* clear private here, it is used to chain pages */ |
205 | p->private = 0; | |
206 | } else | |
fb6813f4 RR |
207 | p = alloc_page(gfp_mask); |
208 | return p; | |
209 | } | |
210 | ||
e9d7417b | 211 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 212 | { |
e9d7417b | 213 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 214 | |
2cb9c6ba | 215 | /* Suppress further interrupts. */ |
e9d7417b | 216 | virtqueue_disable_cb(vq); |
11a3a154 | 217 | |
363f1514 | 218 | /* We were probably waiting for more output buffers. */ |
986a4f4d | 219 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
296f96fc RR |
220 | } |
221 | ||
3464645a | 222 | /* Called from bottom half context */ |
e9d7417b | 223 | static struct sk_buff *page_to_skb(struct receive_queue *rq, |
2613af0e MD |
224 | struct page *page, unsigned int offset, |
225 | unsigned int len, unsigned int truesize) | |
9ab86bbc | 226 | { |
e9d7417b | 227 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc SM |
228 | struct sk_buff *skb; |
229 | struct skb_vnet_hdr *hdr; | |
2613af0e | 230 | unsigned int copy, hdr_len, hdr_padded_len; |
9ab86bbc | 231 | char *p; |
fb6813f4 | 232 | |
2613af0e | 233 | p = page_address(page) + offset; |
3f2c31d9 | 234 | |
9ab86bbc SM |
235 | /* copy small packet so we can reuse these pages for small data */ |
236 | skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); | |
237 | if (unlikely(!skb)) | |
238 | return NULL; | |
3f2c31d9 | 239 | |
9ab86bbc | 240 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 241 | |
9ab86bbc SM |
242 | if (vi->mergeable_rx_bufs) { |
243 | hdr_len = sizeof hdr->mhdr; | |
2613af0e | 244 | hdr_padded_len = sizeof hdr->mhdr; |
9ab86bbc SM |
245 | } else { |
246 | hdr_len = sizeof hdr->hdr; | |
2613af0e | 247 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
9ab86bbc | 248 | } |
3f2c31d9 | 249 | |
9ab86bbc | 250 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 251 | |
9ab86bbc | 252 | len -= hdr_len; |
2613af0e MD |
253 | offset += hdr_padded_len; |
254 | p += hdr_padded_len; | |
3f2c31d9 | 255 | |
9ab86bbc SM |
256 | copy = len; |
257 | if (copy > skb_tailroom(skb)) | |
258 | copy = skb_tailroom(skb); | |
259 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 260 | |
9ab86bbc SM |
261 | len -= copy; |
262 | offset += copy; | |
3f2c31d9 | 263 | |
2613af0e MD |
264 | if (vi->mergeable_rx_bufs) { |
265 | if (len) | |
266 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); | |
267 | else | |
268 | put_page(page); | |
269 | return skb; | |
270 | } | |
271 | ||
e878d78b SL |
272 | /* |
273 | * Verify that we can indeed put this data into a skb. | |
274 | * This is here to handle cases when the device erroneously | |
275 | * tries to receive more than is possible. This is usually | |
276 | * the case of a broken device. | |
277 | */ | |
278 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 279 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
280 | dev_kfree_skb(skb); |
281 | return NULL; | |
282 | } | |
2613af0e | 283 | BUG_ON(offset >= PAGE_SIZE); |
9ab86bbc | 284 | while (len) { |
2613af0e MD |
285 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
286 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, | |
287 | frag_size, truesize); | |
288 | len -= frag_size; | |
9ab86bbc SM |
289 | page = (struct page *)page->private; |
290 | offset = 0; | |
291 | } | |
3f2c31d9 | 292 | |
9ab86bbc | 293 | if (page) |
e9d7417b | 294 | give_pages(rq, page); |
3f2c31d9 | 295 | |
9ab86bbc SM |
296 | return skb; |
297 | } | |
3f2c31d9 | 298 | |
2613af0e | 299 | static int receive_mergeable(struct receive_queue *rq, struct sk_buff *head_skb) |
9ab86bbc | 300 | { |
2613af0e MD |
301 | struct skb_vnet_hdr *hdr = skb_vnet_hdr(head_skb); |
302 | struct sk_buff *curr_skb = head_skb; | |
303 | char *buf; | |
9ab86bbc | 304 | struct page *page; |
ba275241 | 305 | int num_buf, len, offset; |
9ab86bbc SM |
306 | |
307 | num_buf = hdr->mhdr.num_buffers; | |
308 | while (--num_buf) { | |
2613af0e MD |
309 | int num_skb_frags = skb_shinfo(curr_skb)->nr_frags; |
310 | buf = virtqueue_get_buf(rq->vq, &len); | |
311 | if (unlikely(!buf)) { | |
9ab86bbc | 312 | pr_debug("%s: rx error: %d buffers missing\n", |
2613af0e MD |
313 | head_skb->dev->name, hdr->mhdr.num_buffers); |
314 | head_skb->dev->stats.rx_length_errors++; | |
9ab86bbc | 315 | return -EINVAL; |
3f2c31d9 | 316 | } |
2613af0e MD |
317 | if (unlikely(len > MAX_PACKET_LEN)) { |
318 | pr_debug("%s: rx error: merge buffer too long\n", | |
319 | head_skb->dev->name); | |
320 | len = MAX_PACKET_LEN; | |
321 | } | |
322 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { | |
323 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
324 | if (unlikely(!nskb)) { | |
325 | head_skb->dev->stats.rx_dropped++; | |
326 | return -ENOMEM; | |
327 | } | |
328 | if (curr_skb == head_skb) | |
329 | skb_shinfo(curr_skb)->frag_list = nskb; | |
330 | else | |
331 | curr_skb->next = nskb; | |
332 | curr_skb = nskb; | |
333 | head_skb->truesize += nskb->truesize; | |
334 | num_skb_frags = 0; | |
335 | } | |
336 | if (curr_skb != head_skb) { | |
337 | head_skb->data_len += len; | |
338 | head_skb->len += len; | |
339 | head_skb->truesize += MAX_PACKET_LEN; | |
340 | } | |
341 | page = virt_to_head_page(buf); | |
ba275241 JW |
342 | offset = buf - (char *)page_address(page); |
343 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { | |
344 | put_page(page); | |
345 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
346 | len, MAX_PACKET_LEN); | |
347 | } else { | |
348 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
349 | offset, len, | |
350 | MAX_PACKET_LEN); | |
351 | } | |
e9d7417b | 352 | --rq->num; |
9ab86bbc SM |
353 | } |
354 | return 0; | |
355 | } | |
356 | ||
e9d7417b | 357 | static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) |
9ab86bbc | 358 | { |
e9d7417b JW |
359 | struct virtnet_info *vi = rq->vq->vdev->priv; |
360 | struct net_device *dev = vi->dev; | |
58472a76 | 361 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
9ab86bbc SM |
362 | struct sk_buff *skb; |
363 | struct page *page; | |
364 | struct skb_vnet_hdr *hdr; | |
3f2c31d9 | 365 | |
9ab86bbc SM |
366 | if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { |
367 | pr_debug("%s: short packet %i\n", dev->name, len); | |
368 | dev->stats.rx_length_errors++; | |
2613af0e | 369 | if (vi->big_packets) |
e9d7417b | 370 | give_pages(rq, buf); |
2613af0e MD |
371 | else if (vi->mergeable_rx_bufs) |
372 | put_page(virt_to_head_page(buf)); | |
9ab86bbc SM |
373 | else |
374 | dev_kfree_skb(buf); | |
375 | return; | |
376 | } | |
3f2c31d9 | 377 | |
9ab86bbc SM |
378 | if (!vi->mergeable_rx_bufs && !vi->big_packets) { |
379 | skb = buf; | |
380 | len -= sizeof(struct virtio_net_hdr); | |
381 | skb_trim(skb, len); | |
2613af0e MD |
382 | } else if (vi->mergeable_rx_bufs) { |
383 | struct page *page = virt_to_head_page(buf); | |
384 | skb = page_to_skb(rq, page, | |
385 | (char *)buf - (char *)page_address(page), | |
386 | len, MAX_PACKET_LEN); | |
387 | if (unlikely(!skb)) { | |
388 | dev->stats.rx_dropped++; | |
389 | put_page(page); | |
390 | return; | |
391 | } | |
392 | if (receive_mergeable(rq, skb)) { | |
393 | dev_kfree_skb(skb); | |
394 | return; | |
395 | } | |
9ab86bbc SM |
396 | } else { |
397 | page = buf; | |
2613af0e | 398 | skb = page_to_skb(rq, page, 0, len, PAGE_SIZE); |
9ab86bbc | 399 | if (unlikely(!skb)) { |
3f2c31d9 | 400 | dev->stats.rx_dropped++; |
e9d7417b | 401 | give_pages(rq, page); |
9ab86bbc | 402 | return; |
3f2c31d9 | 403 | } |
97402b96 | 404 | } |
3f2c31d9 | 405 | |
9ab86bbc | 406 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 407 | |
83a27052 | 408 | u64_stats_update_begin(&stats->rx_syncp); |
3fa2a1df | 409 | stats->rx_bytes += skb->len; |
410 | stats->rx_packets++; | |
83a27052 | 411 | u64_stats_update_end(&stats->rx_syncp); |
296f96fc | 412 | |
b3f24698 | 413 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
296f96fc | 414 | pr_debug("Needs csum!\n"); |
b3f24698 RR |
415 | if (!skb_partial_csum_set(skb, |
416 | hdr->hdr.csum_start, | |
417 | hdr->hdr.csum_offset)) | |
296f96fc | 418 | goto frame_err; |
10a8d94a JW |
419 | } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { |
420 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
296f96fc RR |
421 | } |
422 | ||
23cde76d MM |
423 | skb->protocol = eth_type_trans(skb, dev); |
424 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
425 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
426 | ||
b3f24698 | 427 | if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
296f96fc | 428 | pr_debug("GSO!\n"); |
b3f24698 | 429 | switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
296f96fc | 430 | case VIRTIO_NET_HDR_GSO_TCPV4: |
c9af6db4 | 431 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
296f96fc | 432 | break; |
296f96fc | 433 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 434 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
296f96fc RR |
435 | break; |
436 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 437 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
296f96fc RR |
438 | break; |
439 | default: | |
be443899 AW |
440 | net_warn_ratelimited("%s: bad gso type %u.\n", |
441 | dev->name, hdr->hdr.gso_type); | |
296f96fc RR |
442 | goto frame_err; |
443 | } | |
444 | ||
b3f24698 | 445 | if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
c9af6db4 | 446 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
34a48579 | 447 | |
b3f24698 | 448 | skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; |
296f96fc | 449 | if (skb_shinfo(skb)->gso_size == 0) { |
be443899 | 450 | net_warn_ratelimited("%s: zero gso size.\n", dev->name); |
296f96fc RR |
451 | goto frame_err; |
452 | } | |
453 | ||
454 | /* Header must be checked, and gso_segs computed. */ | |
455 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
456 | skb_shinfo(skb)->gso_segs = 0; | |
457 | } | |
458 | ||
459 | netif_receive_skb(skb); | |
460 | return; | |
461 | ||
462 | frame_err: | |
463 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
464 | dev_kfree_skb(skb); |
465 | } | |
466 | ||
e9d7417b | 467 | static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp) |
296f96fc | 468 | { |
e9d7417b | 469 | struct virtnet_info *vi = rq->vq->vdev->priv; |
296f96fc | 470 | struct sk_buff *skb; |
9ab86bbc | 471 | struct skb_vnet_hdr *hdr; |
9ab86bbc | 472 | int err; |
3f2c31d9 | 473 | |
3464645a | 474 | skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp); |
9ab86bbc SM |
475 | if (unlikely(!skb)) |
476 | return -ENOMEM; | |
296f96fc | 477 | |
9ab86bbc | 478 | skb_put(skb, MAX_PACKET_LEN); |
3f2c31d9 | 479 | |
9ab86bbc | 480 | hdr = skb_vnet_hdr(skb); |
e9d7417b | 481 | sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr); |
97402b96 | 482 | |
e9d7417b | 483 | skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); |
97402b96 | 484 | |
9dc7b9e4 | 485 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp); |
9ab86bbc SM |
486 | if (err < 0) |
487 | dev_kfree_skb(skb); | |
97402b96 | 488 | |
9ab86bbc SM |
489 | return err; |
490 | } | |
97402b96 | 491 | |
e9d7417b | 492 | static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 493 | { |
9ab86bbc SM |
494 | struct page *first, *list = NULL; |
495 | char *p; | |
496 | int i, err, offset; | |
497 | ||
e9d7417b | 498 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 499 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 500 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
501 | if (!first) { |
502 | if (list) | |
e9d7417b | 503 | give_pages(rq, list); |
9ab86bbc | 504 | return -ENOMEM; |
97402b96 | 505 | } |
e9d7417b | 506 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 507 | |
9ab86bbc SM |
508 | /* chain new page in list head to match sg */ |
509 | first->private = (unsigned long)list; | |
510 | list = first; | |
511 | } | |
296f96fc | 512 | |
e9d7417b | 513 | first = get_a_page(rq, gfp); |
9ab86bbc | 514 | if (!first) { |
e9d7417b | 515 | give_pages(rq, list); |
9ab86bbc SM |
516 | return -ENOMEM; |
517 | } | |
518 | p = page_address(first); | |
519 | ||
e9d7417b JW |
520 | /* rq->sg[0], rq->sg[1] share the same page */ |
521 | /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */ | |
522 | sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr)); | |
9ab86bbc | 523 | |
e9d7417b | 524 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 525 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 526 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
527 | |
528 | /* chain first in list head */ | |
529 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
530 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
531 | first, gfp); | |
9ab86bbc | 532 | if (err < 0) |
e9d7417b | 533 | give_pages(rq, first); |
9ab86bbc SM |
534 | |
535 | return err; | |
296f96fc RR |
536 | } |
537 | ||
e9d7417b | 538 | static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) |
3f2c31d9 | 539 | { |
2613af0e MD |
540 | struct virtnet_info *vi = rq->vq->vdev->priv; |
541 | char *buf = NULL; | |
3f2c31d9 | 542 | int err; |
3f2c31d9 | 543 | |
2613af0e MD |
544 | if (gfp & __GFP_WAIT) { |
545 | if (skb_page_frag_refill(MAX_PACKET_LEN, &vi->alloc_frag, | |
546 | gfp)) { | |
547 | buf = (char *)page_address(vi->alloc_frag.page) + | |
548 | vi->alloc_frag.offset; | |
549 | get_page(vi->alloc_frag.page); | |
550 | vi->alloc_frag.offset += MAX_PACKET_LEN; | |
551 | } | |
552 | } else { | |
553 | buf = netdev_alloc_frag(MAX_PACKET_LEN); | |
554 | } | |
555 | if (!buf) | |
9ab86bbc | 556 | return -ENOMEM; |
3f2c31d9 | 557 | |
2613af0e MD |
558 | sg_init_one(rq->sg, buf, MAX_PACKET_LEN); |
559 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, buf, gfp); | |
9ab86bbc | 560 | if (err < 0) |
2613af0e | 561 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 562 | |
9ab86bbc SM |
563 | return err; |
564 | } | |
3f2c31d9 | 565 | |
b2baed69 RR |
566 | /* |
567 | * Returns false if we couldn't fill entirely (OOM). | |
568 | * | |
569 | * Normally run in the receive path, but can also be run from ndo_open | |
570 | * before we're receiving packets, or from refill_work which is | |
571 | * careful to disable receiving (using napi_disable). | |
572 | */ | |
e9d7417b | 573 | static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) |
9ab86bbc | 574 | { |
e9d7417b | 575 | struct virtnet_info *vi = rq->vq->vdev->priv; |
9ab86bbc | 576 | int err; |
1788f495 | 577 | bool oom; |
3f2c31d9 | 578 | |
9ab86bbc SM |
579 | do { |
580 | if (vi->mergeable_rx_bufs) | |
e9d7417b | 581 | err = add_recvbuf_mergeable(rq, gfp); |
9ab86bbc | 582 | else if (vi->big_packets) |
e9d7417b | 583 | err = add_recvbuf_big(rq, gfp); |
9ab86bbc | 584 | else |
e9d7417b | 585 | err = add_recvbuf_small(rq, gfp); |
3f2c31d9 | 586 | |
1788f495 | 587 | oom = err == -ENOMEM; |
9ed4cb07 | 588 | if (err) |
3f2c31d9 | 589 | break; |
e9d7417b | 590 | ++rq->num; |
b7dfde95 | 591 | } while (rq->vq->num_free); |
e9d7417b JW |
592 | if (unlikely(rq->num > rq->max)) |
593 | rq->max = rq->num; | |
67975901 HG |
594 | if (unlikely(!virtqueue_kick(rq->vq))) |
595 | return false; | |
3161e453 | 596 | return !oom; |
3f2c31d9 MM |
597 | } |
598 | ||
18445c4d | 599 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
600 | { |
601 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 602 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 603 | |
18445c4d | 604 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 605 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 606 | virtqueue_disable_cb(rvq); |
e9d7417b | 607 | __napi_schedule(&rq->napi); |
18445c4d | 608 | } |
296f96fc RR |
609 | } |
610 | ||
e9d7417b | 611 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 612 | { |
e9d7417b | 613 | napi_enable(&rq->napi); |
3e9d08ec BR |
614 | |
615 | /* If all buffers were filled by other side before we napi_enabled, we | |
616 | * won't get another interrupt, so process any outstanding packets | |
617 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
618 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
619 | if (napi_schedule_prep(&rq->napi)) { |
620 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 621 | local_bh_disable(); |
e9d7417b | 622 | __napi_schedule(&rq->napi); |
ec13ee80 | 623 | local_bh_enable(); |
3e9d08ec BR |
624 | } |
625 | } | |
626 | ||
3161e453 RR |
627 | static void refill_work(struct work_struct *work) |
628 | { | |
e9d7417b JW |
629 | struct virtnet_info *vi = |
630 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 631 | bool still_empty; |
986a4f4d JW |
632 | int i; |
633 | ||
55257d72 | 634 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 635 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 636 | |
986a4f4d JW |
637 | napi_disable(&rq->napi); |
638 | still_empty = !try_fill_recv(rq, GFP_KERNEL); | |
639 | virtnet_napi_enable(rq); | |
3161e453 | 640 | |
986a4f4d JW |
641 | /* In theory, this can happen: if we don't get any buffers in |
642 | * we will *never* try to fill again. | |
643 | */ | |
644 | if (still_empty) | |
645 | schedule_delayed_work(&vi->refill, HZ/2); | |
646 | } | |
3161e453 RR |
647 | } |
648 | ||
296f96fc RR |
649 | static int virtnet_poll(struct napi_struct *napi, int budget) |
650 | { | |
e9d7417b JW |
651 | struct receive_queue *rq = |
652 | container_of(napi, struct receive_queue, napi); | |
653 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
9ab86bbc | 654 | void *buf; |
cbdadbbf | 655 | unsigned int r, len, received = 0; |
296f96fc RR |
656 | |
657 | again: | |
658 | while (received < budget && | |
e9d7417b JW |
659 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
660 | receive_buf(rq, buf, len); | |
661 | --rq->num; | |
296f96fc RR |
662 | received++; |
663 | } | |
664 | ||
e9d7417b JW |
665 | if (rq->num < rq->max / 2) { |
666 | if (!try_fill_recv(rq, GFP_ATOMIC)) | |
3b07e9ca | 667 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 668 | } |
296f96fc | 669 | |
8329d98e RR |
670 | /* Out of packets? */ |
671 | if (received < budget) { | |
cbdadbbf | 672 | r = virtqueue_enable_cb_prepare(rq->vq); |
288379f0 | 673 | napi_complete(napi); |
cbdadbbf | 674 | if (unlikely(virtqueue_poll(rq->vq, r)) && |
8e95a202 | 675 | napi_schedule_prep(napi)) { |
e9d7417b | 676 | virtqueue_disable_cb(rq->vq); |
288379f0 | 677 | __napi_schedule(napi); |
296f96fc | 678 | goto again; |
4265f161 | 679 | } |
296f96fc RR |
680 | } |
681 | ||
682 | return received; | |
683 | } | |
684 | ||
986a4f4d JW |
685 | static int virtnet_open(struct net_device *dev) |
686 | { | |
687 | struct virtnet_info *vi = netdev_priv(dev); | |
688 | int i; | |
689 | ||
e4166625 JW |
690 | for (i = 0; i < vi->max_queue_pairs; i++) { |
691 | if (i < vi->curr_queue_pairs) | |
692 | /* Make sure we have some buffers: if oom use wq. */ | |
693 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) | |
694 | schedule_delayed_work(&vi->refill, 0); | |
986a4f4d JW |
695 | virtnet_napi_enable(&vi->rq[i]); |
696 | } | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
b7dfde95 | 701 | static void free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
702 | { |
703 | struct sk_buff *skb; | |
6ee57bcc | 704 | unsigned int len; |
e9d7417b | 705 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 706 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 707 | |
e9d7417b | 708 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 709 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 710 | |
83a27052 | 711 | u64_stats_update_begin(&stats->tx_syncp); |
3fa2a1df | 712 | stats->tx_bytes += skb->len; |
713 | stats->tx_packets++; | |
83a27052 | 714 | u64_stats_update_end(&stats->tx_syncp); |
3fa2a1df | 715 | |
ed79bab8 | 716 | dev_kfree_skb_any(skb); |
296f96fc RR |
717 | } |
718 | } | |
719 | ||
e9d7417b | 720 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 721 | { |
e7428e95 | 722 | struct skb_vnet_hdr *hdr; |
296f96fc | 723 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 724 | struct virtnet_info *vi = sq->vq->vdev->priv; |
7bedc7dc | 725 | unsigned num_sg; |
e7428e95 MT |
726 | unsigned hdr_len; |
727 | bool can_push; | |
296f96fc | 728 | |
e174961c | 729 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
730 | if (vi->mergeable_rx_bufs) |
731 | hdr_len = sizeof hdr->mhdr; | |
732 | else | |
733 | hdr_len = sizeof hdr->hdr; | |
734 | ||
735 | can_push = vi->any_header_sg && | |
736 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
737 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
738 | /* Even if we can, don't push here yet as this would skew | |
739 | * csum_start offset below. */ | |
740 | if (can_push) | |
741 | hdr = (struct skb_vnet_hdr *)(skb->data - hdr_len); | |
742 | else | |
743 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 744 | |
296f96fc | 745 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
b3f24698 | 746 | hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
55508d60 | 747 | hdr->hdr.csum_start = skb_checksum_start_offset(skb); |
b3f24698 | 748 | hdr->hdr.csum_offset = skb->csum_offset; |
296f96fc | 749 | } else { |
b3f24698 RR |
750 | hdr->hdr.flags = 0; |
751 | hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; | |
296f96fc RR |
752 | } |
753 | ||
754 | if (skb_is_gso(skb)) { | |
b3f24698 RR |
755 | hdr->hdr.hdr_len = skb_headlen(skb); |
756 | hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; | |
34a48579 | 757 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) |
b3f24698 | 758 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
296f96fc | 759 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) |
b3f24698 | 760 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
296f96fc | 761 | else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) |
b3f24698 | 762 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
296f96fc RR |
763 | else |
764 | BUG(); | |
34a48579 | 765 | if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) |
b3f24698 | 766 | hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
296f96fc | 767 | } else { |
b3f24698 RR |
768 | hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
769 | hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; | |
296f96fc RR |
770 | } |
771 | ||
3f2c31d9 | 772 | if (vi->mergeable_rx_bufs) |
e7428e95 | 773 | hdr->mhdr.num_buffers = 0; |
3f2c31d9 | 774 | |
e7428e95 MT |
775 | if (can_push) { |
776 | __skb_push(skb, hdr_len); | |
777 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
778 | /* Pull header back to avoid skew in tx bytes calculations. */ | |
779 | __skb_pull(skb, hdr_len); | |
780 | } else { | |
781 | sg_set_buf(sq->sg, hdr, hdr_len); | |
782 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; | |
783 | } | |
9dc7b9e4 | 784 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
785 | } |
786 | ||
424efe9c | 787 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
788 | { |
789 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
790 | int qnum = skb_get_queue_mapping(skb); |
791 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 792 | int err; |
2cb9c6ba | 793 | |
2cb9c6ba | 794 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 795 | free_old_xmit_skbs(sq); |
99ffc696 | 796 | |
03f191ba | 797 | /* Try to transmit */ |
b7dfde95 | 798 | err = xmit_skb(sq, skb); |
48925e37 | 799 | |
9ed4cb07 | 800 | /* This should not happen! */ |
67975901 | 801 | if (unlikely(err) || unlikely(!virtqueue_kick(sq->vq))) { |
9ed4cb07 RR |
802 | dev->stats.tx_fifo_errors++; |
803 | if (net_ratelimit()) | |
804 | dev_warn(&dev->dev, | |
b7dfde95 | 805 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d RR |
806 | dev->stats.tx_dropped++; |
807 | kfree_skb(skb); | |
808 | return NETDEV_TX_OK; | |
296f96fc | 809 | } |
03f191ba | 810 | |
48925e37 RR |
811 | /* Don't wait up for transmitted skbs to be freed. */ |
812 | skb_orphan(skb); | |
813 | nf_reset(skb); | |
814 | ||
815 | /* Apparently nice girls don't return TX_BUSY; stop the queue | |
816 | * before it gets out of hand. Naturally, this wastes entries. */ | |
b7dfde95 | 817 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 818 | netif_stop_subqueue(dev, qnum); |
e9d7417b | 819 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 820 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
821 | free_old_xmit_skbs(sq); |
822 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 823 | netif_start_subqueue(dev, qnum); |
e9d7417b | 824 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
825 | } |
826 | } | |
99ffc696 | 827 | } |
48925e37 RR |
828 | |
829 | return NETDEV_TX_OK; | |
296f96fc RR |
830 | } |
831 | ||
40cbfc37 AK |
832 | /* |
833 | * Send command via the control virtqueue and check status. Commands | |
834 | * supported by the hypervisor, as indicated by feature bits, should | |
835 | * never fail unless improperly formated. | |
836 | */ | |
837 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
f7bc9594 RR |
838 | struct scatterlist *out, |
839 | struct scatterlist *in) | |
40cbfc37 | 840 | { |
f7bc9594 | 841 | struct scatterlist *sgs[4], hdr, stat; |
40cbfc37 AK |
842 | struct virtio_net_ctrl_hdr ctrl; |
843 | virtio_net_ctrl_ack status = ~0; | |
f7bc9594 | 844 | unsigned out_num = 0, in_num = 0, tmp; |
40cbfc37 AK |
845 | |
846 | /* Caller should know better */ | |
f7bc9594 | 847 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 AK |
848 | |
849 | ctrl.class = class; | |
850 | ctrl.cmd = cmd; | |
f7bc9594 RR |
851 | /* Add header */ |
852 | sg_init_one(&hdr, &ctrl, sizeof(ctrl)); | |
853 | sgs[out_num++] = &hdr; | |
40cbfc37 | 854 | |
f7bc9594 RR |
855 | if (out) |
856 | sgs[out_num++] = out; | |
857 | if (in) | |
858 | sgs[out_num + in_num++] = in; | |
40cbfc37 | 859 | |
f7bc9594 RR |
860 | /* Add return status. */ |
861 | sg_init_one(&stat, &status, sizeof(status)); | |
862 | sgs[out_num + in_num++] = &stat; | |
40cbfc37 | 863 | |
f7bc9594 RR |
864 | BUG_ON(out_num + in_num > ARRAY_SIZE(sgs)); |
865 | BUG_ON(virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC) | |
866 | < 0); | |
40cbfc37 | 867 | |
67975901 HG |
868 | if (unlikely(!virtqueue_kick(vi->cvq))) |
869 | return status == VIRTIO_NET_OK; | |
40cbfc37 AK |
870 | |
871 | /* Spin for a response, the kick causes an ioport write, trapping | |
872 | * into the hypervisor, so the request should be handled immediately. | |
873 | */ | |
047b9b94 HG |
874 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
875 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
876 | cpu_relax(); |
877 | ||
878 | return status == VIRTIO_NET_OK; | |
879 | } | |
880 | ||
9c46f6d4 AW |
881 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
882 | { | |
883 | struct virtnet_info *vi = netdev_priv(dev); | |
884 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 885 | int ret; |
7e58d5ae AK |
886 | struct sockaddr *addr = p; |
887 | struct scatterlist sg; | |
9c46f6d4 | 888 | |
7e58d5ae | 889 | ret = eth_prepare_mac_addr_change(dev, p); |
f2f2c8b4 JP |
890 | if (ret) |
891 | return ret; | |
9c46f6d4 | 892 | |
7e58d5ae AK |
893 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
894 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
895 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
896 | VIRTIO_NET_CTRL_MAC_ADDR_SET, | |
f7bc9594 | 897 | &sg, NULL)) { |
7e58d5ae AK |
898 | dev_warn(&vdev->dev, |
899 | "Failed to set mac address by vq command.\n"); | |
900 | return -EINVAL; | |
901 | } | |
902 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { | |
855e0c52 RR |
903 | unsigned int i; |
904 | ||
905 | /* Naturally, this has an atomicity problem. */ | |
906 | for (i = 0; i < dev->addr_len; i++) | |
907 | virtio_cwrite8(vdev, | |
908 | offsetof(struct virtio_net_config, mac) + | |
909 | i, addr->sa_data[i]); | |
7e58d5ae AK |
910 | } |
911 | ||
912 | eth_commit_mac_addr_change(dev, p); | |
9c46f6d4 AW |
913 | |
914 | return 0; | |
915 | } | |
916 | ||
3fa2a1df | 917 | static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, |
918 | struct rtnl_link_stats64 *tot) | |
919 | { | |
920 | struct virtnet_info *vi = netdev_priv(dev); | |
921 | int cpu; | |
922 | unsigned int start; | |
923 | ||
924 | for_each_possible_cpu(cpu) { | |
58472a76 | 925 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 926 | u64 tpackets, tbytes, rpackets, rbytes; |
927 | ||
928 | do { | |
e3906486 | 929 | start = u64_stats_fetch_begin_bh(&stats->tx_syncp); |
3fa2a1df | 930 | tpackets = stats->tx_packets; |
931 | tbytes = stats->tx_bytes; | |
e3906486 | 932 | } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start)); |
83a27052 ED |
933 | |
934 | do { | |
e3906486 | 935 | start = u64_stats_fetch_begin_bh(&stats->rx_syncp); |
3fa2a1df | 936 | rpackets = stats->rx_packets; |
937 | rbytes = stats->rx_bytes; | |
e3906486 | 938 | } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start)); |
3fa2a1df | 939 | |
940 | tot->rx_packets += rpackets; | |
941 | tot->tx_packets += tpackets; | |
942 | tot->rx_bytes += rbytes; | |
943 | tot->tx_bytes += tbytes; | |
944 | } | |
945 | ||
946 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 947 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 948 | tot->rx_dropped = dev->stats.rx_dropped; |
949 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
950 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
951 | ||
952 | return tot; | |
953 | } | |
954 | ||
da74e89d AS |
955 | #ifdef CONFIG_NET_POLL_CONTROLLER |
956 | static void virtnet_netpoll(struct net_device *dev) | |
957 | { | |
958 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 959 | int i; |
da74e89d | 960 | |
986a4f4d JW |
961 | for (i = 0; i < vi->curr_queue_pairs; i++) |
962 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
963 | } |
964 | #endif | |
965 | ||
586d17c5 JW |
966 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
967 | { | |
968 | rtnl_lock(); | |
969 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
f7bc9594 | 970 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, NULL)) |
586d17c5 JW |
971 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
972 | rtnl_unlock(); | |
973 | } | |
974 | ||
986a4f4d JW |
975 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
976 | { | |
977 | struct scatterlist sg; | |
978 | struct virtio_net_ctrl_mq s; | |
979 | struct net_device *dev = vi->dev; | |
980 | ||
981 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
982 | return 0; | |
983 | ||
984 | s.virtqueue_pairs = queue_pairs; | |
985 | sg_init_one(&sg, &s, sizeof(s)); | |
986 | ||
987 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
f7bc9594 | 988 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg, NULL)) { |
986a4f4d JW |
989 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
990 | queue_pairs); | |
991 | return -EINVAL; | |
55257d72 | 992 | } else { |
986a4f4d | 993 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
994 | /* virtnet_open() will refill when device is going to up. */ |
995 | if (dev->flags & IFF_UP) | |
996 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 997 | } |
986a4f4d JW |
998 | |
999 | return 0; | |
1000 | } | |
1001 | ||
296f96fc RR |
1002 | static int virtnet_close(struct net_device *dev) |
1003 | { | |
1004 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1005 | int i; |
296f96fc | 1006 | |
b2baed69 RR |
1007 | /* Make sure refill_work doesn't re-enable napi! */ |
1008 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d JW |
1009 | |
1010 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1011 | napi_disable(&vi->rq[i].napi); | |
296f96fc | 1012 | |
296f96fc RR |
1013 | return 0; |
1014 | } | |
1015 | ||
2af7698e AW |
1016 | static void virtnet_set_rx_mode(struct net_device *dev) |
1017 | { | |
1018 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 1019 | struct scatterlist sg[2]; |
2af7698e | 1020 | u8 promisc, allmulti; |
f565a7c2 | 1021 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 1022 | struct netdev_hw_addr *ha; |
32e7bfc4 | 1023 | int uc_count; |
4cd24eaf | 1024 | int mc_count; |
f565a7c2 AW |
1025 | void *buf; |
1026 | int i; | |
2af7698e AW |
1027 | |
1028 | /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ | |
1029 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) | |
1030 | return; | |
1031 | ||
f565a7c2 AW |
1032 | promisc = ((dev->flags & IFF_PROMISC) != 0); |
1033 | allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1034 | |
23e258e1 | 1035 | sg_init_one(sg, &promisc, sizeof(promisc)); |
2af7698e AW |
1036 | |
1037 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
1038 | VIRTIO_NET_CTRL_RX_PROMISC, | |
f7bc9594 | 1039 | sg, NULL)) |
2af7698e AW |
1040 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
1041 | promisc ? "en" : "dis"); | |
1042 | ||
23e258e1 | 1043 | sg_init_one(sg, &allmulti, sizeof(allmulti)); |
2af7698e AW |
1044 | |
1045 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
1046 | VIRTIO_NET_CTRL_RX_ALLMULTI, | |
f7bc9594 | 1047 | sg, NULL)) |
2af7698e AW |
1048 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
1049 | allmulti ? "en" : "dis"); | |
f565a7c2 | 1050 | |
32e7bfc4 | 1051 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1052 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1053 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1054 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1055 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1056 | mac_data = buf; | |
e68ed8f0 | 1057 | if (!buf) |
f565a7c2 | 1058 | return; |
f565a7c2 | 1059 | |
23e258e1 AW |
1060 | sg_init_table(sg, 2); |
1061 | ||
f565a7c2 | 1062 | /* Store the unicast list and count in the front of the buffer */ |
32e7bfc4 | 1063 | mac_data->entries = uc_count; |
ccffad25 | 1064 | i = 0; |
32e7bfc4 | 1065 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1066 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1067 | |
1068 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1069 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1070 | |
1071 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1072 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1073 | |
4cd24eaf | 1074 | mac_data->entries = mc_count; |
567ec874 | 1075 | i = 0; |
22bedad3 JP |
1076 | netdev_for_each_mc_addr(ha, dev) |
1077 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1078 | |
1079 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1080 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1081 | |
1082 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
1083 | VIRTIO_NET_CTRL_MAC_TABLE_SET, | |
f7bc9594 | 1084 | sg, NULL)) |
f565a7c2 AW |
1085 | dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); |
1086 | ||
1087 | kfree(buf); | |
2af7698e AW |
1088 | } |
1089 | ||
80d5c368 PM |
1090 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
1091 | __be16 proto, u16 vid) | |
0bde9569 AW |
1092 | { |
1093 | struct virtnet_info *vi = netdev_priv(dev); | |
1094 | struct scatterlist sg; | |
1095 | ||
23e258e1 | 1096 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1097 | |
1098 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
f7bc9594 | 1099 | VIRTIO_NET_CTRL_VLAN_ADD, &sg, NULL)) |
0bde9569 | 1100 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1101 | return 0; |
0bde9569 AW |
1102 | } |
1103 | ||
80d5c368 PM |
1104 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1105 | __be16 proto, u16 vid) | |
0bde9569 AW |
1106 | { |
1107 | struct virtnet_info *vi = netdev_priv(dev); | |
1108 | struct scatterlist sg; | |
1109 | ||
23e258e1 | 1110 | sg_init_one(&sg, &vid, sizeof(vid)); |
0bde9569 AW |
1111 | |
1112 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
f7bc9594 | 1113 | VIRTIO_NET_CTRL_VLAN_DEL, &sg, NULL)) |
0bde9569 | 1114 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1115 | return 0; |
0bde9569 AW |
1116 | } |
1117 | ||
8898c21c | 1118 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
986a4f4d JW |
1119 | { |
1120 | int i; | |
1121 | ||
8898c21c WG |
1122 | if (vi->affinity_hint_set) { |
1123 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
47be2479 WG |
1124 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
1125 | virtqueue_set_affinity(vi->sq[i].vq, -1); | |
1126 | } | |
1127 | ||
8898c21c WG |
1128 | vi->affinity_hint_set = false; |
1129 | } | |
8898c21c | 1130 | } |
47be2479 | 1131 | |
8898c21c WG |
1132 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1133 | { | |
1134 | int i; | |
1135 | int cpu; | |
986a4f4d JW |
1136 | |
1137 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1138 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1139 | * setting the affinity hint to eliminate the contention. | |
1140 | */ | |
8898c21c WG |
1141 | if (vi->curr_queue_pairs == 1 || |
1142 | vi->max_queue_pairs != num_online_cpus()) { | |
1143 | virtnet_clean_affinity(vi, -1); | |
1144 | return; | |
986a4f4d JW |
1145 | } |
1146 | ||
8898c21c WG |
1147 | i = 0; |
1148 | for_each_online_cpu(cpu) { | |
986a4f4d JW |
1149 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
1150 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
9bb8ca86 | 1151 | netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); |
8898c21c | 1152 | i++; |
986a4f4d JW |
1153 | } |
1154 | ||
8898c21c | 1155 | vi->affinity_hint_set = true; |
986a4f4d JW |
1156 | } |
1157 | ||
8de4b2f3 WG |
1158 | static int virtnet_cpu_callback(struct notifier_block *nfb, |
1159 | unsigned long action, void *hcpu) | |
1160 | { | |
1161 | struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); | |
1162 | ||
1163 | switch(action & ~CPU_TASKS_FROZEN) { | |
1164 | case CPU_ONLINE: | |
1165 | case CPU_DOWN_FAILED: | |
1166 | case CPU_DEAD: | |
1167 | virtnet_set_affinity(vi); | |
1168 | break; | |
1169 | case CPU_DOWN_PREPARE: | |
1170 | virtnet_clean_affinity(vi, (long)hcpu); | |
1171 | break; | |
1172 | default: | |
1173 | break; | |
1174 | } | |
3ab098df | 1175 | |
8de4b2f3 | 1176 | return NOTIFY_OK; |
986a4f4d JW |
1177 | } |
1178 | ||
8f9f4668 RJ |
1179 | static void virtnet_get_ringparam(struct net_device *dev, |
1180 | struct ethtool_ringparam *ring) | |
1181 | { | |
1182 | struct virtnet_info *vi = netdev_priv(dev); | |
1183 | ||
986a4f4d JW |
1184 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1185 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1186 | ring->rx_pending = ring->rx_max_pending; |
1187 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1188 | } |
1189 | ||
66846048 RJ |
1190 | |
1191 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1192 | struct ethtool_drvinfo *info) | |
1193 | { | |
1194 | struct virtnet_info *vi = netdev_priv(dev); | |
1195 | struct virtio_device *vdev = vi->vdev; | |
1196 | ||
1197 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1198 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1199 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1200 | ||
1201 | } | |
1202 | ||
d73bcd2c JW |
1203 | /* TODO: Eliminate OOO packets during switching */ |
1204 | static int virtnet_set_channels(struct net_device *dev, | |
1205 | struct ethtool_channels *channels) | |
1206 | { | |
1207 | struct virtnet_info *vi = netdev_priv(dev); | |
1208 | u16 queue_pairs = channels->combined_count; | |
1209 | int err; | |
1210 | ||
1211 | /* We don't support separate rx/tx channels. | |
1212 | * We don't allow setting 'other' channels. | |
1213 | */ | |
1214 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1215 | return -EINVAL; | |
1216 | ||
1217 | if (queue_pairs > vi->max_queue_pairs) | |
1218 | return -EINVAL; | |
1219 | ||
47be2479 | 1220 | get_online_cpus(); |
d73bcd2c JW |
1221 | err = virtnet_set_queues(vi, queue_pairs); |
1222 | if (!err) { | |
1223 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1224 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1225 | ||
8898c21c | 1226 | virtnet_set_affinity(vi); |
d73bcd2c | 1227 | } |
47be2479 | 1228 | put_online_cpus(); |
d73bcd2c JW |
1229 | |
1230 | return err; | |
1231 | } | |
1232 | ||
1233 | static void virtnet_get_channels(struct net_device *dev, | |
1234 | struct ethtool_channels *channels) | |
1235 | { | |
1236 | struct virtnet_info *vi = netdev_priv(dev); | |
1237 | ||
1238 | channels->combined_count = vi->curr_queue_pairs; | |
1239 | channels->max_combined = vi->max_queue_pairs; | |
1240 | channels->max_other = 0; | |
1241 | channels->rx_count = 0; | |
1242 | channels->tx_count = 0; | |
1243 | channels->other_count = 0; | |
1244 | } | |
1245 | ||
0fc0b732 | 1246 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1247 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1248 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1249 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1250 | .set_channels = virtnet_set_channels, |
1251 | .get_channels = virtnet_get_channels, | |
a9ea3fc6 HX |
1252 | }; |
1253 | ||
39da5814 MM |
1254 | #define MIN_MTU 68 |
1255 | #define MAX_MTU 65535 | |
1256 | ||
1257 | static int virtnet_change_mtu(struct net_device *dev, int new_mtu) | |
1258 | { | |
1259 | if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) | |
1260 | return -EINVAL; | |
1261 | dev->mtu = new_mtu; | |
1262 | return 0; | |
1263 | } | |
1264 | ||
76288b4e SH |
1265 | static const struct net_device_ops virtnet_netdev = { |
1266 | .ndo_open = virtnet_open, | |
1267 | .ndo_stop = virtnet_close, | |
1268 | .ndo_start_xmit = start_xmit, | |
1269 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1270 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1271 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
76288b4e | 1272 | .ndo_change_mtu = virtnet_change_mtu, |
3fa2a1df | 1273 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1274 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1275 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
1276 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1277 | .ndo_poll_controller = virtnet_netpoll, | |
1278 | #endif | |
1279 | }; | |
1280 | ||
586d17c5 | 1281 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1282 | { |
586d17c5 JW |
1283 | struct virtnet_info *vi = |
1284 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1285 | u16 v; |
1286 | ||
586d17c5 JW |
1287 | mutex_lock(&vi->config_lock); |
1288 | if (!vi->config_enable) | |
1289 | goto done; | |
1290 | ||
855e0c52 RR |
1291 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
1292 | struct virtio_net_config, status, &v) < 0) | |
586d17c5 JW |
1293 | goto done; |
1294 | ||
1295 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1296 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1297 | virtnet_ack_link_announce(vi); |
1298 | } | |
9f4d26d0 MM |
1299 | |
1300 | /* Ignore unknown (future) status bits */ | |
1301 | v &= VIRTIO_NET_S_LINK_UP; | |
1302 | ||
1303 | if (vi->status == v) | |
586d17c5 | 1304 | goto done; |
9f4d26d0 MM |
1305 | |
1306 | vi->status = v; | |
1307 | ||
1308 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1309 | netif_carrier_on(vi->dev); | |
986a4f4d | 1310 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
1311 | } else { |
1312 | netif_carrier_off(vi->dev); | |
986a4f4d | 1313 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 | 1314 | } |
586d17c5 JW |
1315 | done: |
1316 | mutex_unlock(&vi->config_lock); | |
9f4d26d0 MM |
1317 | } |
1318 | ||
1319 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1320 | { | |
1321 | struct virtnet_info *vi = vdev->priv; | |
1322 | ||
3b07e9ca | 1323 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1324 | } |
1325 | ||
986a4f4d JW |
1326 | static void virtnet_free_queues(struct virtnet_info *vi) |
1327 | { | |
1328 | kfree(vi->rq); | |
1329 | kfree(vi->sq); | |
1330 | } | |
1331 | ||
1332 | static void free_receive_bufs(struct virtnet_info *vi) | |
1333 | { | |
1334 | int i; | |
1335 | ||
1336 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1337 | while (vi->rq[i].pages) | |
1338 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
1339 | } | |
1340 | } | |
1341 | ||
1342 | static void free_unused_bufs(struct virtnet_info *vi) | |
1343 | { | |
1344 | void *buf; | |
1345 | int i; | |
1346 | ||
1347 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1348 | struct virtqueue *vq = vi->sq[i].vq; | |
1349 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) | |
1350 | dev_kfree_skb(buf); | |
1351 | } | |
1352 | ||
1353 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1354 | struct virtqueue *vq = vi->rq[i].vq; | |
1355 | ||
1356 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
2613af0e | 1357 | if (vi->big_packets) |
986a4f4d | 1358 | give_pages(&vi->rq[i], buf); |
2613af0e MD |
1359 | else if (vi->mergeable_rx_bufs) |
1360 | put_page(virt_to_head_page(buf)); | |
986a4f4d JW |
1361 | else |
1362 | dev_kfree_skb(buf); | |
1363 | --vi->rq[i].num; | |
1364 | } | |
1365 | BUG_ON(vi->rq[i].num != 0); | |
1366 | } | |
1367 | } | |
1368 | ||
e9d7417b JW |
1369 | static void virtnet_del_vqs(struct virtnet_info *vi) |
1370 | { | |
1371 | struct virtio_device *vdev = vi->vdev; | |
1372 | ||
8898c21c | 1373 | virtnet_clean_affinity(vi, -1); |
986a4f4d | 1374 | |
e9d7417b | 1375 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
1376 | |
1377 | virtnet_free_queues(vi); | |
e9d7417b JW |
1378 | } |
1379 | ||
986a4f4d | 1380 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 1381 | { |
986a4f4d JW |
1382 | vq_callback_t **callbacks; |
1383 | struct virtqueue **vqs; | |
1384 | int ret = -ENOMEM; | |
1385 | int i, total_vqs; | |
1386 | const char **names; | |
1387 | ||
1388 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
1389 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
1390 | * possible control vq. | |
1391 | */ | |
1392 | total_vqs = vi->max_queue_pairs * 2 + | |
1393 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
1394 | ||
1395 | /* Allocate space for find_vqs parameters */ | |
1396 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
1397 | if (!vqs) | |
1398 | goto err_vq; | |
1399 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
1400 | if (!callbacks) | |
1401 | goto err_callback; | |
1402 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
1403 | if (!names) | |
1404 | goto err_names; | |
1405 | ||
1406 | /* Parameters for control virtqueue, if any */ | |
1407 | if (vi->has_cvq) { | |
1408 | callbacks[total_vqs - 1] = NULL; | |
1409 | names[total_vqs - 1] = "control"; | |
1410 | } | |
3f9c10b0 | 1411 | |
986a4f4d JW |
1412 | /* Allocate/initialize parameters for send/receive virtqueues */ |
1413 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1414 | callbacks[rxq2vq(i)] = skb_recv_done; | |
1415 | callbacks[txq2vq(i)] = skb_xmit_done; | |
1416 | sprintf(vi->rq[i].name, "input.%d", i); | |
1417 | sprintf(vi->sq[i].name, "output.%d", i); | |
1418 | names[rxq2vq(i)] = vi->rq[i].name; | |
1419 | names[txq2vq(i)] = vi->sq[i].name; | |
1420 | } | |
3f9c10b0 | 1421 | |
986a4f4d JW |
1422 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
1423 | names); | |
1424 | if (ret) | |
1425 | goto err_find; | |
3f9c10b0 | 1426 | |
986a4f4d JW |
1427 | if (vi->has_cvq) { |
1428 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 1429 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 1430 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 1431 | } |
986a4f4d JW |
1432 | |
1433 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1434 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
1435 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
1436 | } | |
1437 | ||
1438 | kfree(names); | |
1439 | kfree(callbacks); | |
1440 | kfree(vqs); | |
1441 | ||
3f9c10b0 | 1442 | return 0; |
986a4f4d JW |
1443 | |
1444 | err_find: | |
1445 | kfree(names); | |
1446 | err_names: | |
1447 | kfree(callbacks); | |
1448 | err_callback: | |
1449 | kfree(vqs); | |
1450 | err_vq: | |
1451 | return ret; | |
1452 | } | |
1453 | ||
1454 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
1455 | { | |
1456 | int i; | |
1457 | ||
1458 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
1459 | if (!vi->sq) | |
1460 | goto err_sq; | |
1461 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 1462 | if (!vi->rq) |
986a4f4d JW |
1463 | goto err_rq; |
1464 | ||
1465 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
1466 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1467 | vi->rq[i].pages = NULL; | |
1468 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
1469 | napi_weight); | |
1470 | ||
1471 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
1472 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); | |
1473 | } | |
1474 | ||
1475 | return 0; | |
1476 | ||
1477 | err_rq: | |
1478 | kfree(vi->sq); | |
1479 | err_sq: | |
1480 | return -ENOMEM; | |
1481 | } | |
1482 | ||
1483 | static int init_vqs(struct virtnet_info *vi) | |
1484 | { | |
1485 | int ret; | |
1486 | ||
1487 | /* Allocate send & receive queues */ | |
1488 | ret = virtnet_alloc_queues(vi); | |
1489 | if (ret) | |
1490 | goto err; | |
1491 | ||
1492 | ret = virtnet_find_vqs(vi); | |
1493 | if (ret) | |
1494 | goto err_free; | |
1495 | ||
47be2479 | 1496 | get_online_cpus(); |
8898c21c | 1497 | virtnet_set_affinity(vi); |
47be2479 WG |
1498 | put_online_cpus(); |
1499 | ||
986a4f4d JW |
1500 | return 0; |
1501 | ||
1502 | err_free: | |
1503 | virtnet_free_queues(vi); | |
1504 | err: | |
1505 | return ret; | |
3f9c10b0 AS |
1506 | } |
1507 | ||
296f96fc RR |
1508 | static int virtnet_probe(struct virtio_device *vdev) |
1509 | { | |
986a4f4d | 1510 | int i, err; |
296f96fc RR |
1511 | struct net_device *dev; |
1512 | struct virtnet_info *vi; | |
986a4f4d JW |
1513 | u16 max_queue_pairs; |
1514 | ||
1515 | /* Find if host supports multiqueue virtio_net device */ | |
855e0c52 RR |
1516 | err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, |
1517 | struct virtio_net_config, | |
1518 | max_virtqueue_pairs, &max_queue_pairs); | |
986a4f4d JW |
1519 | |
1520 | /* We need at least 2 queue's */ | |
1521 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
1522 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
1523 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
1524 | max_queue_pairs = 1; | |
296f96fc RR |
1525 | |
1526 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 1527 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
1528 | if (!dev) |
1529 | return -ENOMEM; | |
1530 | ||
1531 | /* Set up network device as normal. */ | |
f2f2c8b4 | 1532 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 1533 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 1534 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 1535 | |
a9ea3fc6 | 1536 | SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); |
296f96fc RR |
1537 | SET_NETDEV_DEV(dev, &vdev->dev); |
1538 | ||
1539 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 1540 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 1541 | /* This opens up the world of extra features. */ |
98e778c9 MM |
1542 | dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; |
1543 | if (csum) | |
1544 | dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1545 | ||
1546 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
1547 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO | |
34a48579 RR |
1548 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
1549 | } | |
5539ae96 | 1550 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
1551 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
1552 | dev->hw_features |= NETIF_F_TSO; | |
1553 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
1554 | dev->hw_features |= NETIF_F_TSO6; | |
1555 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
1556 | dev->hw_features |= NETIF_F_TSO_ECN; | |
1557 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) | |
1558 | dev->hw_features |= NETIF_F_UFO; | |
1559 | ||
1560 | if (gso) | |
1561 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); | |
1562 | /* (!csum && gso) case will be fixed by register_netdev() */ | |
296f96fc | 1563 | } |
4f49129b TH |
1564 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
1565 | dev->features |= NETIF_F_RXCSUM; | |
296f96fc | 1566 | |
4fda8302 JW |
1567 | dev->vlan_features = dev->features; |
1568 | ||
296f96fc | 1569 | /* Configuration may specify what MAC to use. Otherwise random. */ |
855e0c52 RR |
1570 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
1571 | virtio_cread_bytes(vdev, | |
1572 | offsetof(struct virtio_net_config, mac), | |
1573 | dev->dev_addr, dev->addr_len); | |
1574 | else | |
f2cedb63 | 1575 | eth_hw_addr_random(dev); |
296f96fc RR |
1576 | |
1577 | /* Set up our device-specific information */ | |
1578 | vi = netdev_priv(dev); | |
296f96fc RR |
1579 | vi->dev = dev; |
1580 | vi->vdev = vdev; | |
d9d5dcc8 | 1581 | vdev->priv = vi; |
3fa2a1df | 1582 | vi->stats = alloc_percpu(struct virtnet_stats); |
1583 | err = -ENOMEM; | |
1584 | if (vi->stats == NULL) | |
1585 | goto free; | |
1586 | ||
827da44c JS |
1587 | for_each_possible_cpu(i) { |
1588 | struct virtnet_stats *virtnet_stats; | |
1589 | virtnet_stats = per_cpu_ptr(vi->stats, i); | |
1590 | u64_stats_init(&virtnet_stats->tx_syncp); | |
1591 | u64_stats_init(&virtnet_stats->rx_syncp); | |
1592 | } | |
1593 | ||
586d17c5 JW |
1594 | mutex_init(&vi->config_lock); |
1595 | vi->config_enable = true; | |
1596 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); | |
296f96fc | 1597 | |
97402b96 | 1598 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
1599 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
1600 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
1601 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) | |
97402b96 HX |
1602 | vi->big_packets = true; |
1603 | ||
3f2c31d9 MM |
1604 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
1605 | vi->mergeable_rx_bufs = true; | |
1606 | ||
e7428e95 MT |
1607 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) |
1608 | vi->any_header_sg = true; | |
1609 | ||
986a4f4d JW |
1610 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
1611 | vi->has_cvq = true; | |
1612 | ||
1613 | /* Use single tx/rx queue pair as default */ | |
1614 | vi->curr_queue_pairs = 1; | |
1615 | vi->max_queue_pairs = max_queue_pairs; | |
1616 | ||
1617 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 1618 | err = init_vqs(vi); |
d2a7ddda | 1619 | if (err) |
9bb8ca86 | 1620 | goto free_stats; |
296f96fc | 1621 | |
986a4f4d JW |
1622 | netif_set_real_num_tx_queues(dev, 1); |
1623 | netif_set_real_num_rx_queues(dev, 1); | |
1624 | ||
296f96fc RR |
1625 | err = register_netdev(dev); |
1626 | if (err) { | |
1627 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 1628 | goto free_vqs; |
296f96fc | 1629 | } |
b3369c1f RR |
1630 | |
1631 | /* Last of all, set up some receive buffers. */ | |
55257d72 | 1632 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d JW |
1633 | try_fill_recv(&vi->rq[i], GFP_KERNEL); |
1634 | ||
1635 | /* If we didn't even get one input buffer, we're useless. */ | |
1636 | if (vi->rq[i].num == 0) { | |
1637 | free_unused_bufs(vi); | |
1638 | err = -ENOMEM; | |
1639 | goto free_recv_bufs; | |
1640 | } | |
b3369c1f RR |
1641 | } |
1642 | ||
8de4b2f3 WG |
1643 | vi->nb.notifier_call = &virtnet_cpu_callback; |
1644 | err = register_hotcpu_notifier(&vi->nb); | |
1645 | if (err) { | |
1646 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
1647 | goto free_recv_bufs; | |
1648 | } | |
1649 | ||
167c25e4 JW |
1650 | /* Assume link up if device can't report link status, |
1651 | otherwise get link status from config. */ | |
1652 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
1653 | netif_carrier_off(dev); | |
3b07e9ca | 1654 | schedule_work(&vi->config_work); |
167c25e4 JW |
1655 | } else { |
1656 | vi->status = VIRTIO_NET_S_LINK_UP; | |
1657 | netif_carrier_on(dev); | |
1658 | } | |
9f4d26d0 | 1659 | |
986a4f4d JW |
1660 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
1661 | dev->name, max_queue_pairs); | |
1662 | ||
296f96fc RR |
1663 | return 0; |
1664 | ||
986a4f4d JW |
1665 | free_recv_bufs: |
1666 | free_receive_bufs(vi); | |
b3369c1f | 1667 | unregister_netdev(dev); |
d2a7ddda | 1668 | free_vqs: |
986a4f4d | 1669 | cancel_delayed_work_sync(&vi->refill); |
e9d7417b | 1670 | virtnet_del_vqs(vi); |
2613af0e MD |
1671 | if (vi->alloc_frag.page) |
1672 | put_page(vi->alloc_frag.page); | |
3fa2a1df | 1673 | free_stats: |
1674 | free_percpu(vi->stats); | |
296f96fc RR |
1675 | free: |
1676 | free_netdev(dev); | |
1677 | return err; | |
1678 | } | |
1679 | ||
04486ed0 | 1680 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 1681 | { |
04486ed0 | 1682 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
1683 | |
1684 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 1685 | free_unused_bufs(vi); |
fb6813f4 | 1686 | |
986a4f4d | 1687 | free_receive_bufs(vi); |
d2a7ddda | 1688 | |
986a4f4d | 1689 | virtnet_del_vqs(vi); |
04486ed0 AS |
1690 | } |
1691 | ||
8cc085d6 | 1692 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
1693 | { |
1694 | struct virtnet_info *vi = vdev->priv; | |
1695 | ||
8de4b2f3 WG |
1696 | unregister_hotcpu_notifier(&vi->nb); |
1697 | ||
586d17c5 JW |
1698 | /* Prevent config work handler from accessing the device. */ |
1699 | mutex_lock(&vi->config_lock); | |
1700 | vi->config_enable = false; | |
1701 | mutex_unlock(&vi->config_lock); | |
1702 | ||
04486ed0 AS |
1703 | unregister_netdev(vi->dev); |
1704 | ||
1705 | remove_vq_common(vi); | |
2613af0e MD |
1706 | if (vi->alloc_frag.page) |
1707 | put_page(vi->alloc_frag.page); | |
fb6813f4 | 1708 | |
586d17c5 JW |
1709 | flush_work(&vi->config_work); |
1710 | ||
2e66f55b | 1711 | free_percpu(vi->stats); |
74b2553f | 1712 | free_netdev(vi->dev); |
296f96fc RR |
1713 | } |
1714 | ||
89107000 | 1715 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
1716 | static int virtnet_freeze(struct virtio_device *vdev) |
1717 | { | |
1718 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1719 | int i; |
0741bcb5 | 1720 | |
ec9debbd JW |
1721 | unregister_hotcpu_notifier(&vi->nb); |
1722 | ||
586d17c5 JW |
1723 | /* Prevent config work handler from accessing the device */ |
1724 | mutex_lock(&vi->config_lock); | |
1725 | vi->config_enable = false; | |
1726 | mutex_unlock(&vi->config_lock); | |
1727 | ||
0741bcb5 AS |
1728 | netif_device_detach(vi->dev); |
1729 | cancel_delayed_work_sync(&vi->refill); | |
1730 | ||
1731 | if (netif_running(vi->dev)) | |
986a4f4d JW |
1732 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1733 | napi_disable(&vi->rq[i].napi); | |
1734 | netif_napi_del(&vi->rq[i].napi); | |
1735 | } | |
0741bcb5 AS |
1736 | |
1737 | remove_vq_common(vi); | |
1738 | ||
586d17c5 JW |
1739 | flush_work(&vi->config_work); |
1740 | ||
0741bcb5 AS |
1741 | return 0; |
1742 | } | |
1743 | ||
1744 | static int virtnet_restore(struct virtio_device *vdev) | |
1745 | { | |
1746 | struct virtnet_info *vi = vdev->priv; | |
986a4f4d | 1747 | int err, i; |
0741bcb5 AS |
1748 | |
1749 | err = init_vqs(vi); | |
1750 | if (err) | |
1751 | return err; | |
1752 | ||
1753 | if (netif_running(vi->dev)) | |
986a4f4d JW |
1754 | for (i = 0; i < vi->max_queue_pairs; i++) |
1755 | virtnet_napi_enable(&vi->rq[i]); | |
0741bcb5 AS |
1756 | |
1757 | netif_device_attach(vi->dev); | |
1758 | ||
55257d72 | 1759 | for (i = 0; i < vi->curr_queue_pairs; i++) |
986a4f4d JW |
1760 | if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) |
1761 | schedule_delayed_work(&vi->refill, 0); | |
0741bcb5 | 1762 | |
586d17c5 JW |
1763 | mutex_lock(&vi->config_lock); |
1764 | vi->config_enable = true; | |
1765 | mutex_unlock(&vi->config_lock); | |
1766 | ||
35ed159b | 1767 | rtnl_lock(); |
986a4f4d | 1768 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
35ed159b | 1769 | rtnl_unlock(); |
986a4f4d | 1770 | |
ec9debbd JW |
1771 | err = register_hotcpu_notifier(&vi->nb); |
1772 | if (err) | |
1773 | return err; | |
1774 | ||
0741bcb5 AS |
1775 | return 0; |
1776 | } | |
1777 | #endif | |
1778 | ||
296f96fc RR |
1779 | static struct virtio_device_id id_table[] = { |
1780 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
1781 | { 0 }, | |
1782 | }; | |
1783 | ||
c45a6816 | 1784 | static unsigned int features[] = { |
5e4fe5c4 MM |
1785 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, |
1786 | VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, | |
c45a6816 | 1787 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, |
97402b96 | 1788 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, |
5c516751 | 1789 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, |
2a41f71d | 1790 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, |
0bde9569 | 1791 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, |
986a4f4d | 1792 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, |
7e58d5ae | 1793 | VIRTIO_NET_F_CTRL_MAC_ADDR, |
e7428e95 | 1794 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
1795 | }; |
1796 | ||
22402529 | 1797 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
1798 | .feature_table = features, |
1799 | .feature_table_size = ARRAY_SIZE(features), | |
296f96fc RR |
1800 | .driver.name = KBUILD_MODNAME, |
1801 | .driver.owner = THIS_MODULE, | |
1802 | .id_table = id_table, | |
1803 | .probe = virtnet_probe, | |
8cc085d6 | 1804 | .remove = virtnet_remove, |
9f4d26d0 | 1805 | .config_changed = virtnet_config_changed, |
89107000 | 1806 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
1807 | .freeze = virtnet_freeze, |
1808 | .restore = virtnet_restore, | |
1809 | #endif | |
296f96fc RR |
1810 | }; |
1811 | ||
b2a17029 | 1812 | module_virtio_driver(virtio_net_driver); |
296f96fc RR |
1813 | |
1814 | MODULE_DEVICE_TABLE(virtio, id_table); | |
1815 | MODULE_DESCRIPTION("Virtio network driver"); | |
1816 | MODULE_LICENSE("GPL"); |