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 | |
adf8d3ff | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
296f96fc RR |
17 | */ |
18 | //#define DEBUG | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 21 | #include <linux/ethtool.h> |
296f96fc RR |
22 | #include <linux/module.h> |
23 | #include <linux/virtio.h> | |
24 | #include <linux/virtio_net.h> | |
f600b690 | 25 | #include <linux/bpf.h> |
a67edbf4 | 26 | #include <linux/bpf_trace.h> |
296f96fc | 27 | #include <linux/scatterlist.h> |
e918085a | 28 | #include <linux/if_vlan.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
8de4b2f3 | 30 | #include <linux/cpu.h> |
ab7db917 | 31 | #include <linux/average.h> |
296f96fc | 32 | |
d34710e3 | 33 | static int napi_weight = NAPI_POLL_WEIGHT; |
6c0cd7c0 DL |
34 | module_param(napi_weight, int, 0444); |
35 | ||
b92f1e67 | 36 | static bool csum = true, gso = true, napi_tx; |
34a48579 RR |
37 | module_param(csum, bool, 0444); |
38 | module_param(gso, bool, 0444); | |
b92f1e67 | 39 | module_param(napi_tx, bool, 0644); |
34a48579 | 40 | |
296f96fc | 41 | /* FIXME: MTU in config. */ |
5061de36 | 42 | #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 43 | #define GOOD_COPY_LEN 128 |
296f96fc | 44 | |
f6b10209 JW |
45 | #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
46 | ||
2de2f7f4 JF |
47 | /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */ |
48 | #define VIRTIO_XDP_HEADROOM 256 | |
49 | ||
5377d758 JB |
50 | /* RX packet size EWMA. The average packet size is used to determine the packet |
51 | * buffer size when refilling RX rings. As the entire RX ring may be refilled | |
52 | * at once, the weight is chosen so that the EWMA will be insensitive to short- | |
53 | * term, transient changes in packet size. | |
ab7db917 | 54 | */ |
eb1e011a | 55 | DECLARE_EWMA(pkt_len, 0, 64) |
ab7db917 | 56 | |
d0fa28f0 MT |
57 | /* With mergeable buffers we align buffer address and use the low bits to |
58 | * encode its true size. Buffer size is up to 1 page so we need to align to | |
59 | * square root of page size to ensure we reserve enough bits to encode the true | |
60 | * size. | |
61 | */ | |
62 | #define MERGEABLE_BUFFER_MIN_ALIGN_SHIFT ((PAGE_SHIFT + 1) / 2) | |
63 | ||
ab7db917 | 64 | /* Minimum alignment for mergeable packet buffers. */ |
d0fa28f0 MT |
65 | #define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, \ |
66 | 1 << MERGEABLE_BUFFER_MIN_ALIGN_SHIFT) | |
ab7db917 | 67 | |
66846048 | 68 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 69 | |
3fa2a1df | 70 | struct virtnet_stats { |
83a27052 ED |
71 | struct u64_stats_sync tx_syncp; |
72 | struct u64_stats_sync rx_syncp; | |
3fa2a1df | 73 | u64 tx_bytes; |
74 | u64 tx_packets; | |
75 | ||
76 | u64 rx_bytes; | |
77 | u64 rx_packets; | |
78 | }; | |
79 | ||
e9d7417b JW |
80 | /* Internal representation of a send virtqueue */ |
81 | struct send_queue { | |
82 | /* Virtqueue associated with this send _queue */ | |
83 | struct virtqueue *vq; | |
84 | ||
85 | /* TX: fragments + linear part + virtio header */ | |
86 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
87 | |
88 | /* Name of the send queue: output.$index */ | |
89 | char name[40]; | |
b92f1e67 WB |
90 | |
91 | struct napi_struct napi; | |
e9d7417b JW |
92 | }; |
93 | ||
94 | /* Internal representation of a receive virtqueue */ | |
95 | struct receive_queue { | |
96 | /* Virtqueue associated with this receive_queue */ | |
97 | struct virtqueue *vq; | |
98 | ||
296f96fc RR |
99 | struct napi_struct napi; |
100 | ||
f600b690 JF |
101 | struct bpf_prog __rcu *xdp_prog; |
102 | ||
e9d7417b JW |
103 | /* Chain pages by the private ptr. */ |
104 | struct page *pages; | |
105 | ||
ab7db917 | 106 | /* Average packet length for mergeable receive buffers. */ |
5377d758 | 107 | struct ewma_pkt_len mrg_avg_pkt_len; |
ab7db917 | 108 | |
fb51879d MD |
109 | /* Page frag for packet buffer allocation. */ |
110 | struct page_frag alloc_frag; | |
111 | ||
e9d7417b JW |
112 | /* RX: fragments + linear part + virtio header */ |
113 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
114 | |
115 | /* Name of this receive queue: input.$index */ | |
116 | char name[40]; | |
e9d7417b JW |
117 | }; |
118 | ||
119 | struct virtnet_info { | |
120 | struct virtio_device *vdev; | |
121 | struct virtqueue *cvq; | |
122 | struct net_device *dev; | |
986a4f4d JW |
123 | struct send_queue *sq; |
124 | struct receive_queue *rq; | |
e9d7417b JW |
125 | unsigned int status; |
126 | ||
986a4f4d JW |
127 | /* Max # of queue pairs supported by the device */ |
128 | u16 max_queue_pairs; | |
129 | ||
130 | /* # of queue pairs currently used by the driver */ | |
131 | u16 curr_queue_pairs; | |
132 | ||
672aafd5 JF |
133 | /* # of XDP queue pairs currently used by the driver */ |
134 | u16 xdp_queue_pairs; | |
135 | ||
97402b96 HX |
136 | /* I like... big packets and I cannot lie! */ |
137 | bool big_packets; | |
138 | ||
3f2c31d9 MM |
139 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
140 | bool mergeable_rx_bufs; | |
141 | ||
986a4f4d JW |
142 | /* Has control virtqueue */ |
143 | bool has_cvq; | |
144 | ||
e7428e95 MT |
145 | /* Host can handle any s/g split between our header and packet data */ |
146 | bool any_header_sg; | |
147 | ||
012873d0 MT |
148 | /* Packet virtio header size */ |
149 | u8 hdr_len; | |
150 | ||
3fa2a1df | 151 | /* Active statistics */ |
152 | struct virtnet_stats __percpu *stats; | |
153 | ||
3161e453 RR |
154 | /* Work struct for refilling if we run low on memory. */ |
155 | struct delayed_work refill; | |
156 | ||
586d17c5 JW |
157 | /* Work struct for config space updates */ |
158 | struct work_struct config_work; | |
159 | ||
986a4f4d JW |
160 | /* Does the affinity hint is set for virtqueues? */ |
161 | bool affinity_hint_set; | |
47be2479 | 162 | |
8017c279 SAS |
163 | /* CPU hotplug instances for online & dead */ |
164 | struct hlist_node node; | |
165 | struct hlist_node node_dead; | |
2ac46030 MT |
166 | |
167 | /* Control VQ buffers: protected by the rtnl lock */ | |
168 | struct virtio_net_ctrl_hdr ctrl_hdr; | |
169 | virtio_net_ctrl_ack ctrl_status; | |
a725ee3e | 170 | struct virtio_net_ctrl_mq ctrl_mq; |
2ac46030 MT |
171 | u8 ctrl_promisc; |
172 | u8 ctrl_allmulti; | |
a725ee3e | 173 | u16 ctrl_vid; |
16032be5 NA |
174 | |
175 | /* Ethtool settings */ | |
176 | u8 duplex; | |
177 | u32 speed; | |
296f96fc RR |
178 | }; |
179 | ||
9ab86bbc | 180 | struct padded_vnet_hdr { |
012873d0 | 181 | struct virtio_net_hdr_mrg_rxbuf hdr; |
9ab86bbc | 182 | /* |
012873d0 MT |
183 | * hdr is in a separate sg buffer, and data sg buffer shares same page |
184 | * with this header sg. This padding makes next sg 16 byte aligned | |
185 | * after the header. | |
9ab86bbc | 186 | */ |
012873d0 | 187 | char padding[4]; |
9ab86bbc SM |
188 | }; |
189 | ||
986a4f4d JW |
190 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
191 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
192 | */ | |
193 | static int vq2txq(struct virtqueue *vq) | |
194 | { | |
9d0ca6ed | 195 | return (vq->index - 1) / 2; |
986a4f4d JW |
196 | } |
197 | ||
198 | static int txq2vq(int txq) | |
199 | { | |
200 | return txq * 2 + 1; | |
201 | } | |
202 | ||
203 | static int vq2rxq(struct virtqueue *vq) | |
204 | { | |
9d0ca6ed | 205 | return vq->index / 2; |
986a4f4d JW |
206 | } |
207 | ||
208 | static int rxq2vq(int rxq) | |
209 | { | |
210 | return rxq * 2; | |
211 | } | |
212 | ||
012873d0 | 213 | static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 214 | { |
012873d0 | 215 | return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; |
296f96fc RR |
216 | } |
217 | ||
9ab86bbc SM |
218 | /* |
219 | * private is used to chain pages for big packets, put the whole | |
220 | * most recent used list in the beginning for reuse | |
221 | */ | |
e9d7417b | 222 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 223 | { |
9ab86bbc | 224 | struct page *end; |
0a888fd1 | 225 | |
e9d7417b | 226 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 227 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
228 | end->private = (unsigned long)rq->pages; |
229 | rq->pages = page; | |
0a888fd1 MM |
230 | } |
231 | ||
e9d7417b | 232 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 233 | { |
e9d7417b | 234 | struct page *p = rq->pages; |
fb6813f4 | 235 | |
9ab86bbc | 236 | if (p) { |
e9d7417b | 237 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
238 | /* clear private here, it is used to chain pages */ |
239 | p->private = 0; | |
240 | } else | |
fb6813f4 RR |
241 | p = alloc_page(gfp_mask); |
242 | return p; | |
243 | } | |
244 | ||
e4e8452a WB |
245 | static void virtqueue_napi_schedule(struct napi_struct *napi, |
246 | struct virtqueue *vq) | |
247 | { | |
248 | if (napi_schedule_prep(napi)) { | |
249 | virtqueue_disable_cb(vq); | |
250 | __napi_schedule(napi); | |
251 | } | |
252 | } | |
253 | ||
254 | static void virtqueue_napi_complete(struct napi_struct *napi, | |
255 | struct virtqueue *vq, int processed) | |
256 | { | |
257 | int opaque; | |
258 | ||
259 | opaque = virtqueue_enable_cb_prepare(vq); | |
260 | if (napi_complete_done(napi, processed) && | |
261 | unlikely(virtqueue_poll(vq, opaque))) | |
262 | virtqueue_napi_schedule(napi, vq); | |
263 | } | |
264 | ||
e9d7417b | 265 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 266 | { |
e9d7417b | 267 | struct virtnet_info *vi = vq->vdev->priv; |
b92f1e67 | 268 | struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; |
296f96fc | 269 | |
2cb9c6ba | 270 | /* Suppress further interrupts. */ |
e9d7417b | 271 | virtqueue_disable_cb(vq); |
11a3a154 | 272 | |
b92f1e67 WB |
273 | if (napi->weight) |
274 | virtqueue_napi_schedule(napi, vq); | |
275 | else | |
276 | /* We were probably waiting for more output buffers. */ | |
277 | netif_wake_subqueue(vi->dev, vq2txq(vq)); | |
296f96fc RR |
278 | } |
279 | ||
ab7db917 MD |
280 | static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) |
281 | { | |
282 | unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); | |
283 | return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; | |
284 | } | |
285 | ||
286 | static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) | |
287 | { | |
288 | return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); | |
289 | ||
290 | } | |
291 | ||
292 | static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) | |
293 | { | |
294 | unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; | |
295 | return (unsigned long)buf | (size - 1); | |
296 | } | |
297 | ||
3464645a | 298 | /* Called from bottom half context */ |
946fa564 MT |
299 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
300 | struct receive_queue *rq, | |
2613af0e MD |
301 | struct page *page, unsigned int offset, |
302 | unsigned int len, unsigned int truesize) | |
9ab86bbc SM |
303 | { |
304 | struct sk_buff *skb; | |
012873d0 | 305 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
2613af0e | 306 | unsigned int copy, hdr_len, hdr_padded_len; |
9ab86bbc | 307 | char *p; |
fb6813f4 | 308 | |
2613af0e | 309 | p = page_address(page) + offset; |
3f2c31d9 | 310 | |
9ab86bbc | 311 | /* copy small packet so we can reuse these pages for small data */ |
c67f5db8 | 312 | skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); |
9ab86bbc SM |
313 | if (unlikely(!skb)) |
314 | return NULL; | |
3f2c31d9 | 315 | |
9ab86bbc | 316 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 317 | |
012873d0 MT |
318 | hdr_len = vi->hdr_len; |
319 | if (vi->mergeable_rx_bufs) | |
320 | hdr_padded_len = sizeof *hdr; | |
321 | else | |
2613af0e | 322 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
3f2c31d9 | 323 | |
9ab86bbc | 324 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 325 | |
9ab86bbc | 326 | len -= hdr_len; |
2613af0e MD |
327 | offset += hdr_padded_len; |
328 | p += hdr_padded_len; | |
3f2c31d9 | 329 | |
9ab86bbc SM |
330 | copy = len; |
331 | if (copy > skb_tailroom(skb)) | |
332 | copy = skb_tailroom(skb); | |
333 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 334 | |
9ab86bbc SM |
335 | len -= copy; |
336 | offset += copy; | |
3f2c31d9 | 337 | |
2613af0e MD |
338 | if (vi->mergeable_rx_bufs) { |
339 | if (len) | |
340 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); | |
341 | else | |
342 | put_page(page); | |
343 | return skb; | |
344 | } | |
345 | ||
e878d78b SL |
346 | /* |
347 | * Verify that we can indeed put this data into a skb. | |
348 | * This is here to handle cases when the device erroneously | |
349 | * tries to receive more than is possible. This is usually | |
350 | * the case of a broken device. | |
351 | */ | |
352 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 353 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
354 | dev_kfree_skb(skb); |
355 | return NULL; | |
356 | } | |
2613af0e | 357 | BUG_ON(offset >= PAGE_SIZE); |
9ab86bbc | 358 | while (len) { |
2613af0e MD |
359 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
360 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, | |
361 | frag_size, truesize); | |
362 | len -= frag_size; | |
9ab86bbc SM |
363 | page = (struct page *)page->private; |
364 | offset = 0; | |
365 | } | |
3f2c31d9 | 366 | |
9ab86bbc | 367 | if (page) |
e9d7417b | 368 | give_pages(rq, page); |
3f2c31d9 | 369 | |
9ab86bbc SM |
370 | return skb; |
371 | } | |
3f2c31d9 | 372 | |
a67edbf4 | 373 | static bool virtnet_xdp_xmit(struct virtnet_info *vi, |
56434a01 | 374 | struct receive_queue *rq, |
f6b10209 | 375 | struct xdp_buff *xdp) |
56434a01 | 376 | { |
56434a01 | 377 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
f6b10209 | 378 | unsigned int len; |
722d8283 JF |
379 | struct send_queue *sq; |
380 | unsigned int qp; | |
56434a01 JF |
381 | void *xdp_sent; |
382 | int err; | |
383 | ||
722d8283 JF |
384 | qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); |
385 | sq = &vi->sq[qp]; | |
386 | ||
56434a01 JF |
387 | /* Free up any pending old buffers before queueing new ones. */ |
388 | while ((xdp_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) { | |
f6b10209 | 389 | struct page *sent_page = virt_to_head_page(xdp_sent); |
bb91accf | 390 | |
f6b10209 | 391 | put_page(sent_page); |
bb91accf | 392 | } |
56434a01 | 393 | |
f6b10209 JW |
394 | xdp->data -= vi->hdr_len; |
395 | /* Zero header and leave csum up to XDP layers */ | |
396 | hdr = xdp->data; | |
397 | memset(hdr, 0, vi->hdr_len); | |
bb91accf | 398 | |
f6b10209 | 399 | sg_init_one(sq->sg, xdp->data, xdp->data_end - xdp->data); |
bb91accf | 400 | |
f6b10209 | 401 | err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp->data, GFP_ATOMIC); |
56434a01 | 402 | if (unlikely(err)) { |
f6b10209 | 403 | struct page *page = virt_to_head_page(xdp->data); |
bb91accf | 404 | |
f6b10209 | 405 | put_page(page); |
a67edbf4 | 406 | return false; |
56434a01 JF |
407 | } |
408 | ||
409 | virtqueue_kick(sq->vq); | |
a67edbf4 | 410 | return true; |
56434a01 JF |
411 | } |
412 | ||
f6b10209 JW |
413 | static unsigned int virtnet_get_headroom(struct virtnet_info *vi) |
414 | { | |
415 | return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0; | |
416 | } | |
417 | ||
bb91accf JW |
418 | static struct sk_buff *receive_small(struct net_device *dev, |
419 | struct virtnet_info *vi, | |
420 | struct receive_queue *rq, | |
421 | void *buf, unsigned int len) | |
f121159d | 422 | { |
f6b10209 | 423 | struct sk_buff *skb; |
bb91accf | 424 | struct bpf_prog *xdp_prog; |
f6b10209 JW |
425 | unsigned int xdp_headroom = virtnet_get_headroom(vi); |
426 | unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; | |
427 | unsigned int headroom = vi->hdr_len + header_offset; | |
428 | unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + | |
429 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
430 | unsigned int delta = 0; | |
012873d0 | 431 | len -= vi->hdr_len; |
f121159d | 432 | |
bb91accf JW |
433 | rcu_read_lock(); |
434 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
435 | if (xdp_prog) { | |
f6b10209 | 436 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; |
0354e4d1 | 437 | struct xdp_buff xdp; |
f6b10209 | 438 | void *orig_data; |
bb91accf JW |
439 | u32 act; |
440 | ||
441 | if (unlikely(hdr->hdr.gso_type || hdr->hdr.flags)) | |
442 | goto err_xdp; | |
0354e4d1 | 443 | |
f6b10209 JW |
444 | xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len; |
445 | xdp.data = xdp.data_hard_start + xdp_headroom; | |
0354e4d1 | 446 | xdp.data_end = xdp.data + len; |
f6b10209 | 447 | orig_data = xdp.data; |
0354e4d1 JF |
448 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
449 | ||
bb91accf JW |
450 | switch (act) { |
451 | case XDP_PASS: | |
2de2f7f4 | 452 | /* Recalculate length in case bpf program changed it */ |
f6b10209 | 453 | delta = orig_data - xdp.data; |
bb91accf JW |
454 | break; |
455 | case XDP_TX: | |
f6b10209 | 456 | if (unlikely(!virtnet_xdp_xmit(vi, rq, &xdp))) |
0354e4d1 | 457 | trace_xdp_exception(vi->dev, xdp_prog, act); |
bb91accf JW |
458 | rcu_read_unlock(); |
459 | goto xdp_xmit; | |
bb91accf | 460 | default: |
0354e4d1 JF |
461 | bpf_warn_invalid_xdp_action(act); |
462 | case XDP_ABORTED: | |
463 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
464 | case XDP_DROP: | |
bb91accf JW |
465 | goto err_xdp; |
466 | } | |
467 | } | |
468 | rcu_read_unlock(); | |
469 | ||
f6b10209 JW |
470 | skb = build_skb(buf, buflen); |
471 | if (!skb) { | |
472 | put_page(virt_to_head_page(buf)); | |
473 | goto err; | |
474 | } | |
475 | skb_reserve(skb, headroom - delta); | |
476 | skb_put(skb, len + delta); | |
477 | if (!delta) { | |
478 | buf += header_offset; | |
479 | memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); | |
480 | } /* keep zeroed vnet hdr since packet was changed by bpf */ | |
481 | ||
482 | err: | |
f121159d | 483 | return skb; |
bb91accf JW |
484 | |
485 | err_xdp: | |
486 | rcu_read_unlock(); | |
487 | dev->stats.rx_dropped++; | |
f6b10209 | 488 | put_page(virt_to_head_page(buf)); |
bb91accf JW |
489 | xdp_xmit: |
490 | return NULL; | |
f121159d MT |
491 | } |
492 | ||
493 | static struct sk_buff *receive_big(struct net_device *dev, | |
946fa564 | 494 | struct virtnet_info *vi, |
f121159d MT |
495 | struct receive_queue *rq, |
496 | void *buf, | |
497 | unsigned int len) | |
498 | { | |
499 | struct page *page = buf; | |
c47a43d3 | 500 | struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE); |
f600b690 | 501 | |
f121159d MT |
502 | if (unlikely(!skb)) |
503 | goto err; | |
504 | ||
505 | return skb; | |
506 | ||
507 | err: | |
508 | dev->stats.rx_dropped++; | |
509 | give_pages(rq, page); | |
510 | return NULL; | |
511 | } | |
512 | ||
72979a6c JF |
513 | /* The conditions to enable XDP should preclude the underlying device from |
514 | * sending packets across multiple buffers (num_buf > 1). However per spec | |
515 | * it does not appear to be illegal to do so but rather just against convention. | |
516 | * So in order to avoid making a system unresponsive the packets are pushed | |
517 | * into a page and the XDP program is run. This will be extremely slow and we | |
518 | * push a warning to the user to fix this as soon as possible. Fixing this may | |
519 | * require resolving the underlying hardware to determine why multiple buffers | |
520 | * are being received or simply loading the XDP program in the ingress stack | |
521 | * after the skb is built because there is no advantage to running it here | |
522 | * anymore. | |
523 | */ | |
524 | static struct page *xdp_linearize_page(struct receive_queue *rq, | |
56a86f84 | 525 | u16 *num_buf, |
72979a6c JF |
526 | struct page *p, |
527 | int offset, | |
528 | unsigned int *len) | |
529 | { | |
530 | struct page *page = alloc_page(GFP_ATOMIC); | |
2de2f7f4 | 531 | unsigned int page_off = VIRTIO_XDP_HEADROOM; |
72979a6c JF |
532 | |
533 | if (!page) | |
534 | return NULL; | |
535 | ||
536 | memcpy(page_address(page) + page_off, page_address(p) + offset, *len); | |
537 | page_off += *len; | |
538 | ||
56a86f84 | 539 | while (--*num_buf) { |
72979a6c JF |
540 | unsigned int buflen; |
541 | unsigned long ctx; | |
542 | void *buf; | |
543 | int off; | |
544 | ||
545 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &buflen); | |
546 | if (unlikely(!ctx)) | |
547 | goto err_buf; | |
548 | ||
56a86f84 JW |
549 | buf = mergeable_ctx_to_buf_address(ctx); |
550 | p = virt_to_head_page(buf); | |
551 | off = buf - page_address(p); | |
552 | ||
72979a6c JF |
553 | /* guard against a misconfigured or uncooperative backend that |
554 | * is sending packet larger than the MTU. | |
555 | */ | |
56a86f84 JW |
556 | if ((page_off + buflen) > PAGE_SIZE) { |
557 | put_page(p); | |
72979a6c | 558 | goto err_buf; |
56a86f84 | 559 | } |
72979a6c JF |
560 | |
561 | memcpy(page_address(page) + page_off, | |
562 | page_address(p) + off, buflen); | |
563 | page_off += buflen; | |
56a86f84 | 564 | put_page(p); |
72979a6c JF |
565 | } |
566 | ||
2de2f7f4 JF |
567 | /* Headroom does not contribute to packet length */ |
568 | *len = page_off - VIRTIO_XDP_HEADROOM; | |
72979a6c JF |
569 | return page; |
570 | err_buf: | |
571 | __free_pages(page, 0); | |
572 | return NULL; | |
573 | } | |
574 | ||
8fc3b9e9 | 575 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
fdd819b2 | 576 | struct virtnet_info *vi, |
8fc3b9e9 | 577 | struct receive_queue *rq, |
ab7db917 | 578 | unsigned long ctx, |
8fc3b9e9 | 579 | unsigned int len) |
9ab86bbc | 580 | { |
ab7db917 | 581 | void *buf = mergeable_ctx_to_buf_address(ctx); |
012873d0 MT |
582 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; |
583 | u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); | |
8fc3b9e9 MT |
584 | struct page *page = virt_to_head_page(buf); |
585 | int offset = buf - page_address(page); | |
f600b690 JF |
586 | struct sk_buff *head_skb, *curr_skb; |
587 | struct bpf_prog *xdp_prog; | |
588 | unsigned int truesize; | |
589 | ||
56434a01 JF |
590 | head_skb = NULL; |
591 | ||
f600b690 JF |
592 | rcu_read_lock(); |
593 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
594 | if (xdp_prog) { | |
72979a6c | 595 | struct page *xdp_page; |
0354e4d1 | 596 | struct xdp_buff xdp; |
0354e4d1 | 597 | void *data; |
f600b690 JF |
598 | u32 act; |
599 | ||
73b62bd0 | 600 | /* This happens when rx buffer size is underestimated */ |
f600b690 | 601 | if (unlikely(num_buf > 1)) { |
72979a6c | 602 | /* linearize data for XDP */ |
56a86f84 | 603 | xdp_page = xdp_linearize_page(rq, &num_buf, |
72979a6c JF |
604 | page, offset, &len); |
605 | if (!xdp_page) | |
606 | goto err_xdp; | |
2de2f7f4 | 607 | offset = VIRTIO_XDP_HEADROOM; |
72979a6c JF |
608 | } else { |
609 | xdp_page = page; | |
f600b690 JF |
610 | } |
611 | ||
612 | /* Transient failure which in theory could occur if | |
613 | * in-flight packets from before XDP was enabled reach | |
614 | * the receive path after XDP is loaded. In practice I | |
615 | * was not able to create this condition. | |
616 | */ | |
b00f70b0 | 617 | if (unlikely(hdr->hdr.gso_type)) |
f600b690 JF |
618 | goto err_xdp; |
619 | ||
2de2f7f4 JF |
620 | /* Allow consuming headroom but reserve enough space to push |
621 | * the descriptor on if we get an XDP_TX return code. | |
622 | */ | |
0354e4d1 | 623 | data = page_address(xdp_page) + offset; |
2de2f7f4 | 624 | xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len; |
0354e4d1 JF |
625 | xdp.data = data + vi->hdr_len; |
626 | xdp.data_end = xdp.data + (len - vi->hdr_len); | |
627 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
628 | ||
56434a01 JF |
629 | switch (act) { |
630 | case XDP_PASS: | |
2de2f7f4 JF |
631 | /* recalculate offset to account for any header |
632 | * adjustments. Note other cases do not build an | |
633 | * skb and avoid using offset | |
634 | */ | |
635 | offset = xdp.data - | |
636 | page_address(xdp_page) - vi->hdr_len; | |
637 | ||
1830f893 JW |
638 | /* We can only create skb based on xdp_page. */ |
639 | if (unlikely(xdp_page != page)) { | |
640 | rcu_read_unlock(); | |
641 | put_page(page); | |
642 | head_skb = page_to_skb(vi, rq, xdp_page, | |
2de2f7f4 | 643 | offset, len, PAGE_SIZE); |
5c33474d | 644 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
1830f893 JW |
645 | return head_skb; |
646 | } | |
56434a01 JF |
647 | break; |
648 | case XDP_TX: | |
f6b10209 | 649 | if (unlikely(!virtnet_xdp_xmit(vi, rq, &xdp))) |
0354e4d1 | 650 | trace_xdp_exception(vi->dev, xdp_prog, act); |
5c33474d | 651 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
72979a6c JF |
652 | if (unlikely(xdp_page != page)) |
653 | goto err_xdp; | |
56434a01 JF |
654 | rcu_read_unlock(); |
655 | goto xdp_xmit; | |
56434a01 | 656 | default: |
0354e4d1 JF |
657 | bpf_warn_invalid_xdp_action(act); |
658 | case XDP_ABORTED: | |
659 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
660 | case XDP_DROP: | |
72979a6c JF |
661 | if (unlikely(xdp_page != page)) |
662 | __free_pages(xdp_page, 0); | |
5c33474d | 663 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
f600b690 | 664 | goto err_xdp; |
56434a01 | 665 | } |
f600b690 JF |
666 | } |
667 | rcu_read_unlock(); | |
ab7db917 | 668 | |
f600b690 JF |
669 | truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
670 | head_skb = page_to_skb(vi, rq, page, offset, len, truesize); | |
671 | curr_skb = head_skb; | |
9ab86bbc | 672 | |
8fc3b9e9 MT |
673 | if (unlikely(!curr_skb)) |
674 | goto err_skb; | |
9ab86bbc | 675 | while (--num_buf) { |
8fc3b9e9 MT |
676 | int num_skb_frags; |
677 | ||
ab7db917 MD |
678 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
679 | if (unlikely(!ctx)) { | |
8fc3b9e9 | 680 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
fdd819b2 | 681 | dev->name, num_buf, |
012873d0 MT |
682 | virtio16_to_cpu(vi->vdev, |
683 | hdr->num_buffers)); | |
8fc3b9e9 MT |
684 | dev->stats.rx_length_errors++; |
685 | goto err_buf; | |
3f2c31d9 | 686 | } |
8fc3b9e9 | 687 | |
ab7db917 | 688 | buf = mergeable_ctx_to_buf_address(ctx); |
8fc3b9e9 | 689 | page = virt_to_head_page(buf); |
8fc3b9e9 MT |
690 | |
691 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; | |
2613af0e MD |
692 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
693 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
8fc3b9e9 MT |
694 | |
695 | if (unlikely(!nskb)) | |
696 | goto err_skb; | |
2613af0e MD |
697 | if (curr_skb == head_skb) |
698 | skb_shinfo(curr_skb)->frag_list = nskb; | |
699 | else | |
700 | curr_skb->next = nskb; | |
701 | curr_skb = nskb; | |
702 | head_skb->truesize += nskb->truesize; | |
703 | num_skb_frags = 0; | |
704 | } | |
ab7db917 | 705 | truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
2613af0e MD |
706 | if (curr_skb != head_skb) { |
707 | head_skb->data_len += len; | |
708 | head_skb->len += len; | |
fb51879d | 709 | head_skb->truesize += truesize; |
2613af0e | 710 | } |
8fc3b9e9 | 711 | offset = buf - page_address(page); |
ba275241 JW |
712 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
713 | put_page(page); | |
714 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
fb51879d | 715 | len, truesize); |
ba275241 JW |
716 | } else { |
717 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
fb51879d | 718 | offset, len, truesize); |
ba275241 | 719 | } |
8fc3b9e9 MT |
720 | } |
721 | ||
5377d758 | 722 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); |
8fc3b9e9 MT |
723 | return head_skb; |
724 | ||
f600b690 JF |
725 | err_xdp: |
726 | rcu_read_unlock(); | |
8fc3b9e9 MT |
727 | err_skb: |
728 | put_page(page); | |
729 | while (--num_buf) { | |
ab7db917 MD |
730 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
731 | if (unlikely(!ctx)) { | |
8fc3b9e9 MT |
732 | pr_debug("%s: rx error: %d buffers missing\n", |
733 | dev->name, num_buf); | |
734 | dev->stats.rx_length_errors++; | |
735 | break; | |
736 | } | |
ab7db917 | 737 | page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); |
8fc3b9e9 | 738 | put_page(page); |
9ab86bbc | 739 | } |
8fc3b9e9 MT |
740 | err_buf: |
741 | dev->stats.rx_dropped++; | |
742 | dev_kfree_skb(head_skb); | |
56434a01 | 743 | xdp_xmit: |
8fc3b9e9 | 744 | return NULL; |
9ab86bbc SM |
745 | } |
746 | ||
61845d20 JW |
747 | static int receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
748 | void *buf, unsigned int len) | |
9ab86bbc | 749 | { |
e9d7417b | 750 | struct net_device *dev = vi->dev; |
9ab86bbc | 751 | struct sk_buff *skb; |
012873d0 | 752 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
61845d20 | 753 | int ret; |
3f2c31d9 | 754 | |
bcff3162 | 755 | if (unlikely(len < vi->hdr_len + ETH_HLEN)) { |
9ab86bbc SM |
756 | pr_debug("%s: short packet %i\n", dev->name, len); |
757 | dev->stats.rx_length_errors++; | |
ab7db917 MD |
758 | if (vi->mergeable_rx_bufs) { |
759 | unsigned long ctx = (unsigned long)buf; | |
760 | void *base = mergeable_ctx_to_buf_address(ctx); | |
761 | put_page(virt_to_head_page(base)); | |
762 | } else if (vi->big_packets) { | |
98bfd23c | 763 | give_pages(rq, buf); |
ab7db917 | 764 | } else { |
f6b10209 | 765 | put_page(virt_to_head_page(buf)); |
ab7db917 | 766 | } |
61845d20 | 767 | return 0; |
9ab86bbc | 768 | } |
3f2c31d9 | 769 | |
f121159d | 770 | if (vi->mergeable_rx_bufs) |
fdd819b2 | 771 | skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len); |
f121159d | 772 | else if (vi->big_packets) |
946fa564 | 773 | skb = receive_big(dev, vi, rq, buf, len); |
f121159d | 774 | else |
bb91accf | 775 | skb = receive_small(dev, vi, rq, buf, len); |
f121159d MT |
776 | |
777 | if (unlikely(!skb)) | |
61845d20 | 778 | return 0; |
3f2c31d9 | 779 | |
9ab86bbc | 780 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 781 | |
61845d20 | 782 | ret = skb->len; |
296f96fc | 783 | |
e858fae2 | 784 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) |
10a8d94a | 785 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
296f96fc | 786 | |
e858fae2 MR |
787 | if (virtio_net_hdr_to_skb(skb, &hdr->hdr, |
788 | virtio_is_little_endian(vi->vdev))) { | |
789 | net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", | |
790 | dev->name, hdr->hdr.gso_type, | |
791 | hdr->hdr.gso_size); | |
792 | goto frame_err; | |
296f96fc RR |
793 | } |
794 | ||
d1dc06dc MR |
795 | skb->protocol = eth_type_trans(skb, dev); |
796 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
797 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
798 | ||
0fbd050a | 799 | napi_gro_receive(&rq->napi, skb); |
61845d20 | 800 | return ret; |
296f96fc RR |
801 | |
802 | frame_err: | |
803 | dev->stats.rx_frame_errors++; | |
296f96fc | 804 | dev_kfree_skb(skb); |
61845d20 | 805 | return 0; |
296f96fc RR |
806 | } |
807 | ||
946fa564 MT |
808 | static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
809 | gfp_t gfp) | |
296f96fc | 810 | { |
f6b10209 JW |
811 | struct page_frag *alloc_frag = &rq->alloc_frag; |
812 | char *buf; | |
2de2f7f4 | 813 | unsigned int xdp_headroom = virtnet_get_headroom(vi); |
f6b10209 | 814 | int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; |
9ab86bbc | 815 | int err; |
3f2c31d9 | 816 | |
f6b10209 JW |
817 | len = SKB_DATA_ALIGN(len) + |
818 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
819 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) | |
9ab86bbc | 820 | return -ENOMEM; |
296f96fc | 821 | |
f6b10209 JW |
822 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
823 | get_page(alloc_frag->page); | |
824 | alloc_frag->offset += len; | |
825 | sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, | |
826 | vi->hdr_len + GOOD_PACKET_LEN); | |
827 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, buf, gfp); | |
9ab86bbc | 828 | if (err < 0) |
f6b10209 | 829 | put_page(virt_to_head_page(buf)); |
97402b96 | 830 | |
9ab86bbc SM |
831 | return err; |
832 | } | |
97402b96 | 833 | |
012873d0 MT |
834 | static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, |
835 | gfp_t gfp) | |
9ab86bbc | 836 | { |
9ab86bbc SM |
837 | struct page *first, *list = NULL; |
838 | char *p; | |
839 | int i, err, offset; | |
840 | ||
a5835440 RR |
841 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
842 | ||
e9d7417b | 843 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 844 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 845 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
846 | if (!first) { |
847 | if (list) | |
e9d7417b | 848 | give_pages(rq, list); |
9ab86bbc | 849 | return -ENOMEM; |
97402b96 | 850 | } |
e9d7417b | 851 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 852 | |
9ab86bbc SM |
853 | /* chain new page in list head to match sg */ |
854 | first->private = (unsigned long)list; | |
855 | list = first; | |
856 | } | |
296f96fc | 857 | |
e9d7417b | 858 | first = get_a_page(rq, gfp); |
9ab86bbc | 859 | if (!first) { |
e9d7417b | 860 | give_pages(rq, list); |
9ab86bbc SM |
861 | return -ENOMEM; |
862 | } | |
863 | p = page_address(first); | |
864 | ||
e9d7417b | 865 | /* rq->sg[0], rq->sg[1] share the same page */ |
012873d0 MT |
866 | /* a separated rq->sg[0] for header - required in case !any_header_sg */ |
867 | sg_set_buf(&rq->sg[0], p, vi->hdr_len); | |
9ab86bbc | 868 | |
e9d7417b | 869 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 870 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 871 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
872 | |
873 | /* chain first in list head */ | |
874 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
875 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
876 | first, gfp); | |
9ab86bbc | 877 | if (err < 0) |
e9d7417b | 878 | give_pages(rq, first); |
9ab86bbc SM |
879 | |
880 | return err; | |
296f96fc RR |
881 | } |
882 | ||
5377d758 | 883 | static unsigned int get_mergeable_buf_len(struct ewma_pkt_len *avg_pkt_len) |
3f2c31d9 | 884 | { |
ab7db917 | 885 | const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
fbf28d78 MD |
886 | unsigned int len; |
887 | ||
5377d758 | 888 | len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), |
fbf28d78 MD |
889 | GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); |
890 | return ALIGN(len, MERGEABLE_BUFFER_ALIGN); | |
891 | } | |
892 | ||
2de2f7f4 JF |
893 | static int add_recvbuf_mergeable(struct virtnet_info *vi, |
894 | struct receive_queue *rq, gfp_t gfp) | |
fbf28d78 | 895 | { |
fb51879d | 896 | struct page_frag *alloc_frag = &rq->alloc_frag; |
2de2f7f4 | 897 | unsigned int headroom = virtnet_get_headroom(vi); |
fb51879d | 898 | char *buf; |
ab7db917 | 899 | unsigned long ctx; |
3f2c31d9 | 900 | int err; |
fb51879d | 901 | unsigned int len, hole; |
3f2c31d9 | 902 | |
fbf28d78 | 903 | len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); |
2de2f7f4 | 904 | if (unlikely(!skb_page_frag_refill(len + headroom, alloc_frag, gfp))) |
9ab86bbc | 905 | return -ENOMEM; |
ab7db917 | 906 | |
fb51879d | 907 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
2de2f7f4 | 908 | buf += headroom; /* advance address leaving hole at front of pkt */ |
ab7db917 | 909 | ctx = mergeable_buf_to_ctx(buf, len); |
fb51879d | 910 | get_page(alloc_frag->page); |
2de2f7f4 | 911 | alloc_frag->offset += len + headroom; |
fb51879d | 912 | hole = alloc_frag->size - alloc_frag->offset; |
2de2f7f4 | 913 | if (hole < len + headroom) { |
ab7db917 MD |
914 | /* To avoid internal fragmentation, if there is very likely not |
915 | * enough space for another buffer, add the remaining space to | |
916 | * the current buffer. This extra space is not included in | |
917 | * the truesize stored in ctx. | |
918 | */ | |
fb51879d MD |
919 | len += hole; |
920 | alloc_frag->offset += hole; | |
921 | } | |
3f2c31d9 | 922 | |
fb51879d | 923 | sg_init_one(rq->sg, buf, len); |
ab7db917 | 924 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); |
9ab86bbc | 925 | if (err < 0) |
2613af0e | 926 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 927 | |
9ab86bbc SM |
928 | return err; |
929 | } | |
3f2c31d9 | 930 | |
b2baed69 RR |
931 | /* |
932 | * Returns false if we couldn't fill entirely (OOM). | |
933 | * | |
934 | * Normally run in the receive path, but can also be run from ndo_open | |
935 | * before we're receiving packets, or from refill_work which is | |
936 | * careful to disable receiving (using napi_disable). | |
937 | */ | |
946fa564 MT |
938 | static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, |
939 | gfp_t gfp) | |
9ab86bbc SM |
940 | { |
941 | int err; | |
1788f495 | 942 | bool oom; |
3f2c31d9 | 943 | |
fb51879d | 944 | gfp |= __GFP_COLD; |
9ab86bbc SM |
945 | do { |
946 | if (vi->mergeable_rx_bufs) | |
2de2f7f4 | 947 | err = add_recvbuf_mergeable(vi, rq, gfp); |
9ab86bbc | 948 | else if (vi->big_packets) |
012873d0 | 949 | err = add_recvbuf_big(vi, rq, gfp); |
9ab86bbc | 950 | else |
946fa564 | 951 | err = add_recvbuf_small(vi, rq, gfp); |
3f2c31d9 | 952 | |
1788f495 | 953 | oom = err == -ENOMEM; |
9ed4cb07 | 954 | if (err) |
3f2c31d9 | 955 | break; |
b7dfde95 | 956 | } while (rq->vq->num_free); |
681daee2 | 957 | virtqueue_kick(rq->vq); |
3161e453 | 958 | return !oom; |
3f2c31d9 MM |
959 | } |
960 | ||
18445c4d | 961 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
962 | { |
963 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 964 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 965 | |
e4e8452a | 966 | virtqueue_napi_schedule(&rq->napi, rvq); |
296f96fc RR |
967 | } |
968 | ||
e4e8452a | 969 | static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) |
3e9d08ec | 970 | { |
e4e8452a | 971 | napi_enable(napi); |
3e9d08ec BR |
972 | |
973 | /* If all buffers were filled by other side before we napi_enabled, we | |
e4e8452a WB |
974 | * won't get another interrupt, so process any outstanding packets now. |
975 | * Call local_bh_enable after to trigger softIRQ processing. | |
976 | */ | |
977 | local_bh_disable(); | |
978 | virtqueue_napi_schedule(napi, vq); | |
979 | local_bh_enable(); | |
3e9d08ec BR |
980 | } |
981 | ||
b92f1e67 WB |
982 | static void virtnet_napi_tx_enable(struct virtnet_info *vi, |
983 | struct virtqueue *vq, | |
984 | struct napi_struct *napi) | |
985 | { | |
986 | if (!napi->weight) | |
987 | return; | |
988 | ||
989 | /* Tx napi touches cachelines on the cpu handling tx interrupts. Only | |
990 | * enable the feature if this is likely affine with the transmit path. | |
991 | */ | |
992 | if (!vi->affinity_hint_set) { | |
993 | napi->weight = 0; | |
994 | return; | |
995 | } | |
996 | ||
997 | return virtnet_napi_enable(vq, napi); | |
998 | } | |
999 | ||
3161e453 RR |
1000 | static void refill_work(struct work_struct *work) |
1001 | { | |
e9d7417b JW |
1002 | struct virtnet_info *vi = |
1003 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 1004 | bool still_empty; |
986a4f4d JW |
1005 | int i; |
1006 | ||
55257d72 | 1007 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 1008 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 1009 | |
986a4f4d | 1010 | napi_disable(&rq->napi); |
946fa564 | 1011 | still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); |
e4e8452a | 1012 | virtnet_napi_enable(rq->vq, &rq->napi); |
3161e453 | 1013 | |
986a4f4d JW |
1014 | /* In theory, this can happen: if we don't get any buffers in |
1015 | * we will *never* try to fill again. | |
1016 | */ | |
1017 | if (still_empty) | |
1018 | schedule_delayed_work(&vi->refill, HZ/2); | |
1019 | } | |
3161e453 RR |
1020 | } |
1021 | ||
2ffa7598 | 1022 | static int virtnet_receive(struct receive_queue *rq, int budget) |
296f96fc | 1023 | { |
e9d7417b | 1024 | struct virtnet_info *vi = rq->vq->vdev->priv; |
61845d20 | 1025 | unsigned int len, received = 0, bytes = 0; |
9ab86bbc | 1026 | void *buf; |
61845d20 | 1027 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 1028 | |
296f96fc | 1029 | while (received < budget && |
e9d7417b | 1030 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
61845d20 | 1031 | bytes += receive_buf(vi, rq, buf, len); |
296f96fc RR |
1032 | received++; |
1033 | } | |
1034 | ||
be121f46 | 1035 | if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { |
946fa564 | 1036 | if (!try_fill_recv(vi, rq, GFP_ATOMIC)) |
3b07e9ca | 1037 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 1038 | } |
296f96fc | 1039 | |
61845d20 JW |
1040 | u64_stats_update_begin(&stats->rx_syncp); |
1041 | stats->rx_bytes += bytes; | |
1042 | stats->rx_packets += received; | |
1043 | u64_stats_update_end(&stats->rx_syncp); | |
1044 | ||
2ffa7598 JW |
1045 | return received; |
1046 | } | |
1047 | ||
ea7735d9 WB |
1048 | static void free_old_xmit_skbs(struct send_queue *sq) |
1049 | { | |
1050 | struct sk_buff *skb; | |
1051 | unsigned int len; | |
1052 | struct virtnet_info *vi = sq->vq->vdev->priv; | |
1053 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); | |
1054 | unsigned int packets = 0; | |
1055 | unsigned int bytes = 0; | |
1056 | ||
1057 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { | |
1058 | pr_debug("Sent skb %p\n", skb); | |
1059 | ||
1060 | bytes += skb->len; | |
1061 | packets++; | |
1062 | ||
1063 | dev_kfree_skb_any(skb); | |
1064 | } | |
1065 | ||
1066 | /* Avoid overhead when no packets have been processed | |
1067 | * happens when called speculatively from start_xmit. | |
1068 | */ | |
1069 | if (!packets) | |
1070 | return; | |
1071 | ||
1072 | u64_stats_update_begin(&stats->tx_syncp); | |
1073 | stats->tx_bytes += bytes; | |
1074 | stats->tx_packets += packets; | |
1075 | u64_stats_update_end(&stats->tx_syncp); | |
1076 | } | |
1077 | ||
7b0411ef WB |
1078 | static void virtnet_poll_cleantx(struct receive_queue *rq) |
1079 | { | |
1080 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
1081 | unsigned int index = vq2rxq(rq->vq); | |
1082 | struct send_queue *sq = &vi->sq[index]; | |
1083 | struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); | |
1084 | ||
1085 | if (!sq->napi.weight) | |
1086 | return; | |
1087 | ||
1088 | if (__netif_tx_trylock(txq)) { | |
1089 | free_old_xmit_skbs(sq); | |
1090 | __netif_tx_unlock(txq); | |
1091 | } | |
1092 | ||
1093 | if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) | |
1094 | netif_tx_wake_queue(txq); | |
1095 | } | |
1096 | ||
2ffa7598 JW |
1097 | static int virtnet_poll(struct napi_struct *napi, int budget) |
1098 | { | |
1099 | struct receive_queue *rq = | |
1100 | container_of(napi, struct receive_queue, napi); | |
e4e8452a | 1101 | unsigned int received; |
2ffa7598 | 1102 | |
7b0411ef WB |
1103 | virtnet_poll_cleantx(rq); |
1104 | ||
faadb05f | 1105 | received = virtnet_receive(rq, budget); |
2ffa7598 | 1106 | |
8329d98e | 1107 | /* Out of packets? */ |
e4e8452a WB |
1108 | if (received < budget) |
1109 | virtqueue_napi_complete(napi, rq->vq, received); | |
296f96fc RR |
1110 | |
1111 | return received; | |
1112 | } | |
1113 | ||
986a4f4d JW |
1114 | static int virtnet_open(struct net_device *dev) |
1115 | { | |
1116 | struct virtnet_info *vi = netdev_priv(dev); | |
1117 | int i; | |
1118 | ||
e4166625 JW |
1119 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1120 | if (i < vi->curr_queue_pairs) | |
1121 | /* Make sure we have some buffers: if oom use wq. */ | |
946fa564 | 1122 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
e4166625 | 1123 | schedule_delayed_work(&vi->refill, 0); |
e4e8452a | 1124 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
b92f1e67 | 1125 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); |
986a4f4d JW |
1126 | } |
1127 | ||
1128 | return 0; | |
1129 | } | |
1130 | ||
b92f1e67 WB |
1131 | static int virtnet_poll_tx(struct napi_struct *napi, int budget) |
1132 | { | |
1133 | struct send_queue *sq = container_of(napi, struct send_queue, napi); | |
1134 | struct virtnet_info *vi = sq->vq->vdev->priv; | |
1135 | struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, vq2txq(sq->vq)); | |
1136 | ||
1137 | __netif_tx_lock(txq, raw_smp_processor_id()); | |
1138 | free_old_xmit_skbs(sq); | |
1139 | __netif_tx_unlock(txq); | |
1140 | ||
1141 | virtqueue_napi_complete(napi, sq->vq, 0); | |
1142 | ||
1143 | if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) | |
1144 | netif_tx_wake_queue(txq); | |
1145 | ||
1146 | return 0; | |
1147 | } | |
1148 | ||
e9d7417b | 1149 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 1150 | { |
012873d0 | 1151 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
296f96fc | 1152 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 1153 | struct virtnet_info *vi = sq->vq->vdev->priv; |
7bedc7dc | 1154 | unsigned num_sg; |
012873d0 | 1155 | unsigned hdr_len = vi->hdr_len; |
e7428e95 | 1156 | bool can_push; |
296f96fc | 1157 | |
e174961c | 1158 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
1159 | |
1160 | can_push = vi->any_header_sg && | |
1161 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
1162 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
1163 | /* Even if we can, don't push here yet as this would skew | |
1164 | * csum_start offset below. */ | |
1165 | if (can_push) | |
012873d0 | 1166 | hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); |
e7428e95 MT |
1167 | else |
1168 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 1169 | |
e858fae2 | 1170 | if (virtio_net_hdr_from_skb(skb, &hdr->hdr, |
6391a448 | 1171 | virtio_is_little_endian(vi->vdev), false)) |
e858fae2 | 1172 | BUG(); |
296f96fc | 1173 | |
3f2c31d9 | 1174 | if (vi->mergeable_rx_bufs) |
012873d0 | 1175 | hdr->num_buffers = 0; |
3f2c31d9 | 1176 | |
547c890c | 1177 | sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); |
e7428e95 MT |
1178 | if (can_push) { |
1179 | __skb_push(skb, hdr_len); | |
1180 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
1181 | /* Pull header back to avoid skew in tx bytes calculations. */ | |
1182 | __skb_pull(skb, hdr_len); | |
1183 | } else { | |
1184 | sg_set_buf(sq->sg, hdr, hdr_len); | |
1185 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; | |
1186 | } | |
9dc7b9e4 | 1187 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
1188 | } |
1189 | ||
424efe9c | 1190 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
1191 | { |
1192 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
1193 | int qnum = skb_get_queue_mapping(skb); |
1194 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 1195 | int err; |
4b7fd2e6 MT |
1196 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
1197 | bool kick = !skb->xmit_more; | |
b92f1e67 | 1198 | bool use_napi = sq->napi.weight; |
2cb9c6ba | 1199 | |
2cb9c6ba | 1200 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 1201 | free_old_xmit_skbs(sq); |
99ffc696 | 1202 | |
bdb12e0d WB |
1203 | if (use_napi && kick) |
1204 | virtqueue_enable_cb_delayed(sq->vq); | |
1205 | ||
074c3582 JK |
1206 | /* timestamp packet in software */ |
1207 | skb_tx_timestamp(skb); | |
1208 | ||
03f191ba | 1209 | /* Try to transmit */ |
b7dfde95 | 1210 | err = xmit_skb(sq, skb); |
48925e37 | 1211 | |
9ed4cb07 | 1212 | /* This should not happen! */ |
681daee2 | 1213 | if (unlikely(err)) { |
9ed4cb07 RR |
1214 | dev->stats.tx_fifo_errors++; |
1215 | if (net_ratelimit()) | |
1216 | dev_warn(&dev->dev, | |
b7dfde95 | 1217 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d | 1218 | dev->stats.tx_dropped++; |
85e94525 | 1219 | dev_kfree_skb_any(skb); |
58eba97d | 1220 | return NETDEV_TX_OK; |
296f96fc | 1221 | } |
03f191ba | 1222 | |
48925e37 | 1223 | /* Don't wait up for transmitted skbs to be freed. */ |
b92f1e67 WB |
1224 | if (!use_napi) { |
1225 | skb_orphan(skb); | |
1226 | nf_reset(skb); | |
1227 | } | |
48925e37 | 1228 | |
60302ff6 MT |
1229 | /* If running out of space, stop queue to avoid getting packets that we |
1230 | * are then unable to transmit. | |
1231 | * An alternative would be to force queuing layer to requeue the skb by | |
1232 | * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be | |
1233 | * returned in a normal path of operation: it means that driver is not | |
1234 | * maintaining the TX queue stop/start state properly, and causes | |
1235 | * the stack to do a non-trivial amount of useless work. | |
1236 | * Since most packets only take 1 or 2 ring slots, stopping the queue | |
1237 | * early means 16 slots are typically wasted. | |
d631b94e | 1238 | */ |
b7dfde95 | 1239 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 1240 | netif_stop_subqueue(dev, qnum); |
b92f1e67 WB |
1241 | if (!use_napi && |
1242 | unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { | |
48925e37 | 1243 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
1244 | free_old_xmit_skbs(sq); |
1245 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 1246 | netif_start_subqueue(dev, qnum); |
e9d7417b | 1247 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
1248 | } |
1249 | } | |
99ffc696 | 1250 | } |
48925e37 | 1251 | |
4b7fd2e6 | 1252 | if (kick || netif_xmit_stopped(txq)) |
0b725a2c | 1253 | virtqueue_kick(sq->vq); |
296f96fc | 1254 | |
0b725a2c | 1255 | return NETDEV_TX_OK; |
c223a078 DM |
1256 | } |
1257 | ||
40cbfc37 AK |
1258 | /* |
1259 | * Send command via the control virtqueue and check status. Commands | |
1260 | * supported by the hypervisor, as indicated by feature bits, should | |
788a8b6d | 1261 | * never fail unless improperly formatted. |
40cbfc37 AK |
1262 | */ |
1263 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
d24bae32 | 1264 | struct scatterlist *out) |
40cbfc37 | 1265 | { |
f7bc9594 | 1266 | struct scatterlist *sgs[4], hdr, stat; |
d24bae32 | 1267 | unsigned out_num = 0, tmp; |
40cbfc37 AK |
1268 | |
1269 | /* Caller should know better */ | |
f7bc9594 | 1270 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 | 1271 | |
2ac46030 MT |
1272 | vi->ctrl_status = ~0; |
1273 | vi->ctrl_hdr.class = class; | |
1274 | vi->ctrl_hdr.cmd = cmd; | |
f7bc9594 | 1275 | /* Add header */ |
2ac46030 | 1276 | sg_init_one(&hdr, &vi->ctrl_hdr, sizeof(vi->ctrl_hdr)); |
f7bc9594 | 1277 | sgs[out_num++] = &hdr; |
40cbfc37 | 1278 | |
f7bc9594 RR |
1279 | if (out) |
1280 | sgs[out_num++] = out; | |
40cbfc37 | 1281 | |
f7bc9594 | 1282 | /* Add return status. */ |
2ac46030 | 1283 | sg_init_one(&stat, &vi->ctrl_status, sizeof(vi->ctrl_status)); |
d24bae32 | 1284 | sgs[out_num] = &stat; |
40cbfc37 | 1285 | |
d24bae32 | 1286 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
a7c58146 | 1287 | virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
40cbfc37 | 1288 | |
67975901 | 1289 | if (unlikely(!virtqueue_kick(vi->cvq))) |
2ac46030 | 1290 | return vi->ctrl_status == VIRTIO_NET_OK; |
40cbfc37 AK |
1291 | |
1292 | /* Spin for a response, the kick causes an ioport write, trapping | |
1293 | * into the hypervisor, so the request should be handled immediately. | |
1294 | */ | |
047b9b94 HG |
1295 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
1296 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
1297 | cpu_relax(); |
1298 | ||
2ac46030 | 1299 | return vi->ctrl_status == VIRTIO_NET_OK; |
40cbfc37 AK |
1300 | } |
1301 | ||
9c46f6d4 AW |
1302 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
1303 | { | |
1304 | struct virtnet_info *vi = netdev_priv(dev); | |
1305 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 1306 | int ret; |
e37e2ff3 | 1307 | struct sockaddr *addr; |
7e58d5ae | 1308 | struct scatterlist sg; |
9c46f6d4 | 1309 | |
801822d1 | 1310 | addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); |
e37e2ff3 AL |
1311 | if (!addr) |
1312 | return -ENOMEM; | |
e37e2ff3 AL |
1313 | |
1314 | ret = eth_prepare_mac_addr_change(dev, addr); | |
f2f2c8b4 | 1315 | if (ret) |
e37e2ff3 | 1316 | goto out; |
9c46f6d4 | 1317 | |
7e58d5ae AK |
1318 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
1319 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
1320 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1321 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
7e58d5ae AK |
1322 | dev_warn(&vdev->dev, |
1323 | "Failed to set mac address by vq command.\n"); | |
e37e2ff3 AL |
1324 | ret = -EINVAL; |
1325 | goto out; | |
7e58d5ae | 1326 | } |
7e93a02f MT |
1327 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && |
1328 | !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
855e0c52 RR |
1329 | unsigned int i; |
1330 | ||
1331 | /* Naturally, this has an atomicity problem. */ | |
1332 | for (i = 0; i < dev->addr_len; i++) | |
1333 | virtio_cwrite8(vdev, | |
1334 | offsetof(struct virtio_net_config, mac) + | |
1335 | i, addr->sa_data[i]); | |
7e58d5ae AK |
1336 | } |
1337 | ||
1338 | eth_commit_mac_addr_change(dev, p); | |
e37e2ff3 | 1339 | ret = 0; |
9c46f6d4 | 1340 | |
e37e2ff3 AL |
1341 | out: |
1342 | kfree(addr); | |
1343 | return ret; | |
9c46f6d4 AW |
1344 | } |
1345 | ||
bc1f4470 | 1346 | static void virtnet_stats(struct net_device *dev, |
1347 | struct rtnl_link_stats64 *tot) | |
3fa2a1df | 1348 | { |
1349 | struct virtnet_info *vi = netdev_priv(dev); | |
1350 | int cpu; | |
1351 | unsigned int start; | |
1352 | ||
1353 | for_each_possible_cpu(cpu) { | |
58472a76 | 1354 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 1355 | u64 tpackets, tbytes, rpackets, rbytes; |
1356 | ||
1357 | do { | |
57a7744e | 1358 | start = u64_stats_fetch_begin_irq(&stats->tx_syncp); |
3fa2a1df | 1359 | tpackets = stats->tx_packets; |
1360 | tbytes = stats->tx_bytes; | |
57a7744e | 1361 | } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); |
83a27052 ED |
1362 | |
1363 | do { | |
57a7744e | 1364 | start = u64_stats_fetch_begin_irq(&stats->rx_syncp); |
3fa2a1df | 1365 | rpackets = stats->rx_packets; |
1366 | rbytes = stats->rx_bytes; | |
57a7744e | 1367 | } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); |
3fa2a1df | 1368 | |
1369 | tot->rx_packets += rpackets; | |
1370 | tot->tx_packets += tpackets; | |
1371 | tot->rx_bytes += rbytes; | |
1372 | tot->tx_bytes += tbytes; | |
1373 | } | |
1374 | ||
1375 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 1376 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 1377 | tot->rx_dropped = dev->stats.rx_dropped; |
1378 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
1379 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
3fa2a1df | 1380 | } |
1381 | ||
da74e89d AS |
1382 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1383 | static void virtnet_netpoll(struct net_device *dev) | |
1384 | { | |
1385 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1386 | int i; |
da74e89d | 1387 | |
986a4f4d JW |
1388 | for (i = 0; i < vi->curr_queue_pairs; i++) |
1389 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
1390 | } |
1391 | #endif | |
1392 | ||
586d17c5 JW |
1393 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
1394 | { | |
1395 | rtnl_lock(); | |
1396 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
d24bae32 | 1397 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
586d17c5 JW |
1398 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
1399 | rtnl_unlock(); | |
1400 | } | |
1401 | ||
47315329 | 1402 | static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
986a4f4d JW |
1403 | { |
1404 | struct scatterlist sg; | |
986a4f4d JW |
1405 | struct net_device *dev = vi->dev; |
1406 | ||
1407 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
1408 | return 0; | |
1409 | ||
a725ee3e AL |
1410 | vi->ctrl_mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
1411 | sg_init_one(&sg, &vi->ctrl_mq, sizeof(vi->ctrl_mq)); | |
986a4f4d JW |
1412 | |
1413 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
d24bae32 | 1414 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
986a4f4d JW |
1415 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
1416 | queue_pairs); | |
1417 | return -EINVAL; | |
55257d72 | 1418 | } else { |
986a4f4d | 1419 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
1420 | /* virtnet_open() will refill when device is going to up. */ |
1421 | if (dev->flags & IFF_UP) | |
1422 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 1423 | } |
986a4f4d JW |
1424 | |
1425 | return 0; | |
1426 | } | |
1427 | ||
47315329 JF |
1428 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
1429 | { | |
1430 | int err; | |
1431 | ||
1432 | rtnl_lock(); | |
1433 | err = _virtnet_set_queues(vi, queue_pairs); | |
1434 | rtnl_unlock(); | |
1435 | return err; | |
1436 | } | |
1437 | ||
296f96fc RR |
1438 | static int virtnet_close(struct net_device *dev) |
1439 | { | |
1440 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1441 | int i; |
296f96fc | 1442 | |
b2baed69 RR |
1443 | /* Make sure refill_work doesn't re-enable napi! */ |
1444 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d | 1445 | |
b92f1e67 | 1446 | for (i = 0; i < vi->max_queue_pairs; i++) { |
986a4f4d | 1447 | napi_disable(&vi->rq[i].napi); |
b92f1e67 WB |
1448 | napi_disable(&vi->sq[i].napi); |
1449 | } | |
296f96fc | 1450 | |
296f96fc RR |
1451 | return 0; |
1452 | } | |
1453 | ||
2af7698e AW |
1454 | static void virtnet_set_rx_mode(struct net_device *dev) |
1455 | { | |
1456 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 1457 | struct scatterlist sg[2]; |
f565a7c2 | 1458 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 1459 | struct netdev_hw_addr *ha; |
32e7bfc4 | 1460 | int uc_count; |
4cd24eaf | 1461 | int mc_count; |
f565a7c2 AW |
1462 | void *buf; |
1463 | int i; | |
2af7698e | 1464 | |
788a8b6d | 1465 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
2af7698e AW |
1466 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
1467 | return; | |
1468 | ||
2ac46030 MT |
1469 | vi->ctrl_promisc = ((dev->flags & IFF_PROMISC) != 0); |
1470 | vi->ctrl_allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1471 | |
2ac46030 | 1472 | sg_init_one(sg, &vi->ctrl_promisc, sizeof(vi->ctrl_promisc)); |
2af7698e AW |
1473 | |
1474 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1475 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
2af7698e | 1476 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
2ac46030 | 1477 | vi->ctrl_promisc ? "en" : "dis"); |
2af7698e | 1478 | |
2ac46030 | 1479 | sg_init_one(sg, &vi->ctrl_allmulti, sizeof(vi->ctrl_allmulti)); |
2af7698e AW |
1480 | |
1481 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1482 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
2af7698e | 1483 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
2ac46030 | 1484 | vi->ctrl_allmulti ? "en" : "dis"); |
f565a7c2 | 1485 | |
32e7bfc4 | 1486 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1487 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1488 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1489 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1490 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1491 | mac_data = buf; | |
e68ed8f0 | 1492 | if (!buf) |
f565a7c2 | 1493 | return; |
f565a7c2 | 1494 | |
23e258e1 AW |
1495 | sg_init_table(sg, 2); |
1496 | ||
f565a7c2 | 1497 | /* Store the unicast list and count in the front of the buffer */ |
fdd819b2 | 1498 | mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); |
ccffad25 | 1499 | i = 0; |
32e7bfc4 | 1500 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1501 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1502 | |
1503 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1504 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1505 | |
1506 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1507 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1508 | |
fdd819b2 | 1509 | mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); |
567ec874 | 1510 | i = 0; |
22bedad3 JP |
1511 | netdev_for_each_mc_addr(ha, dev) |
1512 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1513 | |
1514 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1515 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1516 | |
1517 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1518 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
99e872ae | 1519 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
f565a7c2 AW |
1520 | |
1521 | kfree(buf); | |
2af7698e AW |
1522 | } |
1523 | ||
80d5c368 PM |
1524 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
1525 | __be16 proto, u16 vid) | |
0bde9569 AW |
1526 | { |
1527 | struct virtnet_info *vi = netdev_priv(dev); | |
1528 | struct scatterlist sg; | |
1529 | ||
a725ee3e AL |
1530 | vi->ctrl_vid = vid; |
1531 | sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid)); | |
0bde9569 AW |
1532 | |
1533 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1534 | VIRTIO_NET_CTRL_VLAN_ADD, &sg)) |
0bde9569 | 1535 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1536 | return 0; |
0bde9569 AW |
1537 | } |
1538 | ||
80d5c368 PM |
1539 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1540 | __be16 proto, u16 vid) | |
0bde9569 AW |
1541 | { |
1542 | struct virtnet_info *vi = netdev_priv(dev); | |
1543 | struct scatterlist sg; | |
1544 | ||
a725ee3e AL |
1545 | vi->ctrl_vid = vid; |
1546 | sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid)); | |
0bde9569 AW |
1547 | |
1548 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1549 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
0bde9569 | 1550 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1551 | return 0; |
0bde9569 AW |
1552 | } |
1553 | ||
8898c21c | 1554 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
986a4f4d JW |
1555 | { |
1556 | int i; | |
1557 | ||
8898c21c WG |
1558 | if (vi->affinity_hint_set) { |
1559 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
47be2479 WG |
1560 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
1561 | virtqueue_set_affinity(vi->sq[i].vq, -1); | |
1562 | } | |
1563 | ||
8898c21c WG |
1564 | vi->affinity_hint_set = false; |
1565 | } | |
8898c21c | 1566 | } |
47be2479 | 1567 | |
8898c21c WG |
1568 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1569 | { | |
1570 | int i; | |
1571 | int cpu; | |
986a4f4d JW |
1572 | |
1573 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1574 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1575 | * setting the affinity hint to eliminate the contention. | |
1576 | */ | |
8898c21c WG |
1577 | if (vi->curr_queue_pairs == 1 || |
1578 | vi->max_queue_pairs != num_online_cpus()) { | |
1579 | virtnet_clean_affinity(vi, -1); | |
1580 | return; | |
986a4f4d JW |
1581 | } |
1582 | ||
8898c21c WG |
1583 | i = 0; |
1584 | for_each_online_cpu(cpu) { | |
986a4f4d JW |
1585 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
1586 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
9bb8ca86 | 1587 | netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); |
8898c21c | 1588 | i++; |
986a4f4d JW |
1589 | } |
1590 | ||
8898c21c | 1591 | vi->affinity_hint_set = true; |
986a4f4d JW |
1592 | } |
1593 | ||
8017c279 | 1594 | static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) |
8de4b2f3 | 1595 | { |
8017c279 SAS |
1596 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, |
1597 | node); | |
1598 | virtnet_set_affinity(vi); | |
1599 | return 0; | |
1600 | } | |
8de4b2f3 | 1601 | |
8017c279 SAS |
1602 | static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) |
1603 | { | |
1604 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
1605 | node_dead); | |
1606 | virtnet_set_affinity(vi); | |
1607 | return 0; | |
1608 | } | |
3ab098df | 1609 | |
8017c279 SAS |
1610 | static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) |
1611 | { | |
1612 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
1613 | node); | |
1614 | ||
1615 | virtnet_clean_affinity(vi, cpu); | |
1616 | return 0; | |
1617 | } | |
1618 | ||
1619 | static enum cpuhp_state virtionet_online; | |
1620 | ||
1621 | static int virtnet_cpu_notif_add(struct virtnet_info *vi) | |
1622 | { | |
1623 | int ret; | |
1624 | ||
1625 | ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); | |
1626 | if (ret) | |
1627 | return ret; | |
1628 | ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
1629 | &vi->node_dead); | |
1630 | if (!ret) | |
1631 | return ret; | |
1632 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
1633 | return ret; | |
1634 | } | |
1635 | ||
1636 | static void virtnet_cpu_notif_remove(struct virtnet_info *vi) | |
1637 | { | |
1638 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
1639 | cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
1640 | &vi->node_dead); | |
986a4f4d JW |
1641 | } |
1642 | ||
8f9f4668 RJ |
1643 | static void virtnet_get_ringparam(struct net_device *dev, |
1644 | struct ethtool_ringparam *ring) | |
1645 | { | |
1646 | struct virtnet_info *vi = netdev_priv(dev); | |
1647 | ||
986a4f4d JW |
1648 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1649 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1650 | ring->rx_pending = ring->rx_max_pending; |
1651 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1652 | } |
1653 | ||
66846048 RJ |
1654 | |
1655 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1656 | struct ethtool_drvinfo *info) | |
1657 | { | |
1658 | struct virtnet_info *vi = netdev_priv(dev); | |
1659 | struct virtio_device *vdev = vi->vdev; | |
1660 | ||
1661 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1662 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1663 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1664 | ||
1665 | } | |
1666 | ||
d73bcd2c JW |
1667 | /* TODO: Eliminate OOO packets during switching */ |
1668 | static int virtnet_set_channels(struct net_device *dev, | |
1669 | struct ethtool_channels *channels) | |
1670 | { | |
1671 | struct virtnet_info *vi = netdev_priv(dev); | |
1672 | u16 queue_pairs = channels->combined_count; | |
1673 | int err; | |
1674 | ||
1675 | /* We don't support separate rx/tx channels. | |
1676 | * We don't allow setting 'other' channels. | |
1677 | */ | |
1678 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1679 | return -EINVAL; | |
1680 | ||
c18e9cd6 | 1681 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
d73bcd2c JW |
1682 | return -EINVAL; |
1683 | ||
f600b690 JF |
1684 | /* For now we don't support modifying channels while XDP is loaded |
1685 | * also when XDP is loaded all RX queues have XDP programs so we only | |
1686 | * need to check a single RX queue. | |
1687 | */ | |
1688 | if (vi->rq[0].xdp_prog) | |
1689 | return -EINVAL; | |
1690 | ||
47be2479 | 1691 | get_online_cpus(); |
47315329 | 1692 | err = _virtnet_set_queues(vi, queue_pairs); |
d73bcd2c JW |
1693 | if (!err) { |
1694 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1695 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1696 | ||
8898c21c | 1697 | virtnet_set_affinity(vi); |
d73bcd2c | 1698 | } |
47be2479 | 1699 | put_online_cpus(); |
d73bcd2c JW |
1700 | |
1701 | return err; | |
1702 | } | |
1703 | ||
1704 | static void virtnet_get_channels(struct net_device *dev, | |
1705 | struct ethtool_channels *channels) | |
1706 | { | |
1707 | struct virtnet_info *vi = netdev_priv(dev); | |
1708 | ||
1709 | channels->combined_count = vi->curr_queue_pairs; | |
1710 | channels->max_combined = vi->max_queue_pairs; | |
1711 | channels->max_other = 0; | |
1712 | channels->rx_count = 0; | |
1713 | channels->tx_count = 0; | |
1714 | channels->other_count = 0; | |
1715 | } | |
1716 | ||
16032be5 | 1717 | /* Check if the user is trying to change anything besides speed/duplex */ |
ebb6b4b1 PR |
1718 | static bool |
1719 | virtnet_validate_ethtool_cmd(const struct ethtool_link_ksettings *cmd) | |
16032be5 | 1720 | { |
ebb6b4b1 PR |
1721 | struct ethtool_link_ksettings diff1 = *cmd; |
1722 | struct ethtool_link_ksettings diff2 = {}; | |
16032be5 | 1723 | |
0cf3ace9 NA |
1724 | /* cmd is always set so we need to clear it, validate the port type |
1725 | * and also without autonegotiation we can ignore advertising | |
1726 | */ | |
ebb6b4b1 PR |
1727 | diff1.base.speed = 0; |
1728 | diff2.base.port = PORT_OTHER; | |
1729 | ethtool_link_ksettings_zero_link_mode(&diff1, advertising); | |
1730 | diff1.base.duplex = 0; | |
1731 | diff1.base.cmd = 0; | |
1732 | diff1.base.link_mode_masks_nwords = 0; | |
1733 | ||
1734 | return !memcmp(&diff1.base, &diff2.base, sizeof(diff1.base)) && | |
1735 | bitmap_empty(diff1.link_modes.supported, | |
1736 | __ETHTOOL_LINK_MODE_MASK_NBITS) && | |
1737 | bitmap_empty(diff1.link_modes.advertising, | |
1738 | __ETHTOOL_LINK_MODE_MASK_NBITS) && | |
1739 | bitmap_empty(diff1.link_modes.lp_advertising, | |
1740 | __ETHTOOL_LINK_MODE_MASK_NBITS); | |
16032be5 NA |
1741 | } |
1742 | ||
ebb6b4b1 PR |
1743 | static int virtnet_set_link_ksettings(struct net_device *dev, |
1744 | const struct ethtool_link_ksettings *cmd) | |
16032be5 NA |
1745 | { |
1746 | struct virtnet_info *vi = netdev_priv(dev); | |
1747 | u32 speed; | |
1748 | ||
ebb6b4b1 | 1749 | speed = cmd->base.speed; |
16032be5 NA |
1750 | /* don't allow custom speed and duplex */ |
1751 | if (!ethtool_validate_speed(speed) || | |
ebb6b4b1 | 1752 | !ethtool_validate_duplex(cmd->base.duplex) || |
16032be5 NA |
1753 | !virtnet_validate_ethtool_cmd(cmd)) |
1754 | return -EINVAL; | |
1755 | vi->speed = speed; | |
ebb6b4b1 | 1756 | vi->duplex = cmd->base.duplex; |
16032be5 NA |
1757 | |
1758 | return 0; | |
1759 | } | |
1760 | ||
ebb6b4b1 PR |
1761 | static int virtnet_get_link_ksettings(struct net_device *dev, |
1762 | struct ethtool_link_ksettings *cmd) | |
16032be5 NA |
1763 | { |
1764 | struct virtnet_info *vi = netdev_priv(dev); | |
1765 | ||
ebb6b4b1 PR |
1766 | cmd->base.speed = vi->speed; |
1767 | cmd->base.duplex = vi->duplex; | |
1768 | cmd->base.port = PORT_OTHER; | |
16032be5 NA |
1769 | |
1770 | return 0; | |
1771 | } | |
1772 | ||
1773 | static void virtnet_init_settings(struct net_device *dev) | |
1774 | { | |
1775 | struct virtnet_info *vi = netdev_priv(dev); | |
1776 | ||
1777 | vi->speed = SPEED_UNKNOWN; | |
1778 | vi->duplex = DUPLEX_UNKNOWN; | |
1779 | } | |
1780 | ||
0fc0b732 | 1781 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1782 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1783 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1784 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1785 | .set_channels = virtnet_set_channels, |
1786 | .get_channels = virtnet_get_channels, | |
074c3582 | 1787 | .get_ts_info = ethtool_op_get_ts_info, |
ebb6b4b1 PR |
1788 | .get_link_ksettings = virtnet_get_link_ksettings, |
1789 | .set_link_ksettings = virtnet_set_link_ksettings, | |
a9ea3fc6 HX |
1790 | }; |
1791 | ||
9fe7bfce JF |
1792 | static void virtnet_freeze_down(struct virtio_device *vdev) |
1793 | { | |
1794 | struct virtnet_info *vi = vdev->priv; | |
1795 | int i; | |
1796 | ||
1797 | /* Make sure no work handler is accessing the device */ | |
1798 | flush_work(&vi->config_work); | |
1799 | ||
1800 | netif_device_detach(vi->dev); | |
1801 | cancel_delayed_work_sync(&vi->refill); | |
1802 | ||
1803 | if (netif_running(vi->dev)) { | |
b92f1e67 | 1804 | for (i = 0; i < vi->max_queue_pairs; i++) { |
9fe7bfce | 1805 | napi_disable(&vi->rq[i].napi); |
b92f1e67 WB |
1806 | napi_disable(&vi->sq[i].napi); |
1807 | } | |
9fe7bfce JF |
1808 | } |
1809 | } | |
1810 | ||
1811 | static int init_vqs(struct virtnet_info *vi); | |
2de2f7f4 | 1812 | static void _remove_vq_common(struct virtnet_info *vi); |
9fe7bfce JF |
1813 | |
1814 | static int virtnet_restore_up(struct virtio_device *vdev) | |
1815 | { | |
1816 | struct virtnet_info *vi = vdev->priv; | |
1817 | int err, i; | |
1818 | ||
1819 | err = init_vqs(vi); | |
1820 | if (err) | |
1821 | return err; | |
1822 | ||
1823 | virtio_device_ready(vdev); | |
1824 | ||
1825 | if (netif_running(vi->dev)) { | |
1826 | for (i = 0; i < vi->curr_queue_pairs; i++) | |
1827 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) | |
1828 | schedule_delayed_work(&vi->refill, 0); | |
1829 | ||
b92f1e67 | 1830 | for (i = 0; i < vi->max_queue_pairs; i++) { |
e4e8452a | 1831 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
b92f1e67 WB |
1832 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, |
1833 | &vi->sq[i].napi); | |
1834 | } | |
9fe7bfce JF |
1835 | } |
1836 | ||
1837 | netif_device_attach(vi->dev); | |
1838 | return err; | |
1839 | } | |
1840 | ||
017b29c3 | 1841 | static int virtnet_reset(struct virtnet_info *vi, int curr_qp, int xdp_qp) |
2de2f7f4 JF |
1842 | { |
1843 | struct virtio_device *dev = vi->vdev; | |
1844 | int ret; | |
1845 | ||
1846 | virtio_config_disable(dev); | |
1847 | dev->failed = dev->config->get_status(dev) & VIRTIO_CONFIG_S_FAILED; | |
1848 | virtnet_freeze_down(dev); | |
1849 | _remove_vq_common(vi); | |
1850 | ||
1851 | dev->config->reset(dev); | |
1852 | virtio_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE); | |
1853 | virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER); | |
1854 | ||
1855 | ret = virtio_finalize_features(dev); | |
1856 | if (ret) | |
1857 | goto err; | |
1858 | ||
017b29c3 | 1859 | vi->xdp_queue_pairs = xdp_qp; |
2de2f7f4 JF |
1860 | ret = virtnet_restore_up(dev); |
1861 | if (ret) | |
1862 | goto err; | |
017b29c3 | 1863 | ret = _virtnet_set_queues(vi, curr_qp); |
2de2f7f4 JF |
1864 | if (ret) |
1865 | goto err; | |
1866 | ||
1867 | virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); | |
1868 | virtio_config_enable(dev); | |
1869 | return 0; | |
1870 | err: | |
1871 | virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED); | |
1872 | return ret; | |
1873 | } | |
1874 | ||
f600b690 JF |
1875 | static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog) |
1876 | { | |
1877 | unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); | |
1878 | struct virtnet_info *vi = netdev_priv(dev); | |
1879 | struct bpf_prog *old_prog; | |
017b29c3 | 1880 | u16 xdp_qp = 0, curr_qp; |
672aafd5 | 1881 | int i, err; |
f600b690 JF |
1882 | |
1883 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || | |
92502fe8 JW |
1884 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || |
1885 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || | |
1886 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO)) { | |
f600b690 JF |
1887 | netdev_warn(dev, "can't set XDP while host is implementing LRO, disable LRO first\n"); |
1888 | return -EOPNOTSUPP; | |
1889 | } | |
1890 | ||
1891 | if (vi->mergeable_rx_bufs && !vi->any_header_sg) { | |
1892 | netdev_warn(dev, "XDP expects header/data in single page, any_header_sg required\n"); | |
1893 | return -EINVAL; | |
1894 | } | |
1895 | ||
1896 | if (dev->mtu > max_sz) { | |
1897 | netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); | |
1898 | return -EINVAL; | |
1899 | } | |
1900 | ||
672aafd5 JF |
1901 | curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; |
1902 | if (prog) | |
1903 | xdp_qp = nr_cpu_ids; | |
1904 | ||
1905 | /* XDP requires extra queues for XDP_TX */ | |
1906 | if (curr_qp + xdp_qp > vi->max_queue_pairs) { | |
1907 | netdev_warn(dev, "request %i queues but max is %i\n", | |
1908 | curr_qp + xdp_qp, vi->max_queue_pairs); | |
1909 | return -ENOMEM; | |
1910 | } | |
1911 | ||
2de2f7f4 JF |
1912 | if (prog) { |
1913 | prog = bpf_prog_add(prog, vi->max_queue_pairs - 1); | |
1914 | if (IS_ERR(prog)) | |
1915 | return PTR_ERR(prog); | |
1916 | } | |
1917 | ||
2de2f7f4 JF |
1918 | /* Changing the headroom in buffers is a disruptive operation because |
1919 | * existing buffers must be flushed and reallocated. This will happen | |
1920 | * when a xdp program is initially added or xdp is disabled by removing | |
1921 | * the xdp program resulting in number of XDP queues changing. | |
1922 | */ | |
1923 | if (vi->xdp_queue_pairs != xdp_qp) { | |
017b29c3 JW |
1924 | err = virtnet_reset(vi, curr_qp + xdp_qp, xdp_qp); |
1925 | if (err) { | |
1926 | dev_warn(&dev->dev, "XDP reset failure.\n"); | |
2de2f7f4 | 1927 | goto virtio_reset_err; |
017b29c3 | 1928 | } |
f600b690 JF |
1929 | } |
1930 | ||
672aafd5 JF |
1931 | netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); |
1932 | ||
f600b690 JF |
1933 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1934 | old_prog = rtnl_dereference(vi->rq[i].xdp_prog); | |
1935 | rcu_assign_pointer(vi->rq[i].xdp_prog, prog); | |
1936 | if (old_prog) | |
1937 | bpf_prog_put(old_prog); | |
1938 | } | |
1939 | ||
1940 | return 0; | |
2de2f7f4 JF |
1941 | |
1942 | virtio_reset_err: | |
1943 | /* On reset error do our best to unwind XDP changes inflight and return | |
1944 | * error up to user space for resolution. The underlying reset hung on | |
1945 | * us so not much we can do here. | |
1946 | */ | |
2de2f7f4 JF |
1947 | if (prog) |
1948 | bpf_prog_sub(prog, vi->max_queue_pairs - 1); | |
1949 | return err; | |
f600b690 JF |
1950 | } |
1951 | ||
1952 | static bool virtnet_xdp_query(struct net_device *dev) | |
1953 | { | |
1954 | struct virtnet_info *vi = netdev_priv(dev); | |
1955 | int i; | |
1956 | ||
1957 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1958 | if (vi->rq[i].xdp_prog) | |
1959 | return true; | |
1960 | } | |
1961 | return false; | |
1962 | } | |
1963 | ||
1964 | static int virtnet_xdp(struct net_device *dev, struct netdev_xdp *xdp) | |
1965 | { | |
1966 | switch (xdp->command) { | |
1967 | case XDP_SETUP_PROG: | |
1968 | return virtnet_xdp_set(dev, xdp->prog); | |
1969 | case XDP_QUERY_PROG: | |
1970 | xdp->prog_attached = virtnet_xdp_query(dev); | |
1971 | return 0; | |
1972 | default: | |
1973 | return -EINVAL; | |
1974 | } | |
1975 | } | |
1976 | ||
76288b4e SH |
1977 | static const struct net_device_ops virtnet_netdev = { |
1978 | .ndo_open = virtnet_open, | |
1979 | .ndo_stop = virtnet_close, | |
1980 | .ndo_start_xmit = start_xmit, | |
1981 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1982 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1983 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
3fa2a1df | 1984 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1985 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1986 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
1987 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1988 | .ndo_poll_controller = virtnet_netpoll, | |
91815639 | 1989 | #endif |
f600b690 | 1990 | .ndo_xdp = virtnet_xdp, |
76288b4e SH |
1991 | }; |
1992 | ||
586d17c5 | 1993 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1994 | { |
586d17c5 JW |
1995 | struct virtnet_info *vi = |
1996 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1997 | u16 v; |
1998 | ||
855e0c52 RR |
1999 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
2000 | struct virtio_net_config, status, &v) < 0) | |
507613bf | 2001 | return; |
586d17c5 JW |
2002 | |
2003 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 2004 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
2005 | virtnet_ack_link_announce(vi); |
2006 | } | |
9f4d26d0 MM |
2007 | |
2008 | /* Ignore unknown (future) status bits */ | |
2009 | v &= VIRTIO_NET_S_LINK_UP; | |
2010 | ||
2011 | if (vi->status == v) | |
507613bf | 2012 | return; |
9f4d26d0 MM |
2013 | |
2014 | vi->status = v; | |
2015 | ||
2016 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
2017 | netif_carrier_on(vi->dev); | |
986a4f4d | 2018 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
2019 | } else { |
2020 | netif_carrier_off(vi->dev); | |
986a4f4d | 2021 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 MM |
2022 | } |
2023 | } | |
2024 | ||
2025 | static void virtnet_config_changed(struct virtio_device *vdev) | |
2026 | { | |
2027 | struct virtnet_info *vi = vdev->priv; | |
2028 | ||
3b07e9ca | 2029 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
2030 | } |
2031 | ||
986a4f4d JW |
2032 | static void virtnet_free_queues(struct virtnet_info *vi) |
2033 | { | |
d4fb84ee AV |
2034 | int i; |
2035 | ||
ab3971b1 JW |
2036 | for (i = 0; i < vi->max_queue_pairs; i++) { |
2037 | napi_hash_del(&vi->rq[i].napi); | |
d4fb84ee | 2038 | netif_napi_del(&vi->rq[i].napi); |
b92f1e67 | 2039 | netif_napi_del(&vi->sq[i].napi); |
ab3971b1 | 2040 | } |
d4fb84ee | 2041 | |
963abe5c ED |
2042 | /* We called napi_hash_del() before netif_napi_del(), |
2043 | * we need to respect an RCU grace period before freeing vi->rq | |
2044 | */ | |
2045 | synchronize_net(); | |
2046 | ||
986a4f4d JW |
2047 | kfree(vi->rq); |
2048 | kfree(vi->sq); | |
2049 | } | |
2050 | ||
47315329 | 2051 | static void _free_receive_bufs(struct virtnet_info *vi) |
986a4f4d | 2052 | { |
f600b690 | 2053 | struct bpf_prog *old_prog; |
986a4f4d JW |
2054 | int i; |
2055 | ||
2056 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2057 | while (vi->rq[i].pages) | |
2058 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
f600b690 JF |
2059 | |
2060 | old_prog = rtnl_dereference(vi->rq[i].xdp_prog); | |
2061 | RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); | |
2062 | if (old_prog) | |
2063 | bpf_prog_put(old_prog); | |
986a4f4d | 2064 | } |
47315329 JF |
2065 | } |
2066 | ||
2067 | static void free_receive_bufs(struct virtnet_info *vi) | |
2068 | { | |
2069 | rtnl_lock(); | |
2070 | _free_receive_bufs(vi); | |
f600b690 | 2071 | rtnl_unlock(); |
986a4f4d JW |
2072 | } |
2073 | ||
fb51879d MD |
2074 | static void free_receive_page_frags(struct virtnet_info *vi) |
2075 | { | |
2076 | int i; | |
2077 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2078 | if (vi->rq[i].alloc_frag.page) | |
2079 | put_page(vi->rq[i].alloc_frag.page); | |
2080 | } | |
2081 | ||
b68df015 | 2082 | static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) |
56434a01 JF |
2083 | { |
2084 | if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) | |
2085 | return false; | |
2086 | else if (q < vi->curr_queue_pairs) | |
2087 | return true; | |
2088 | else | |
2089 | return false; | |
2090 | } | |
2091 | ||
986a4f4d JW |
2092 | static void free_unused_bufs(struct virtnet_info *vi) |
2093 | { | |
2094 | void *buf; | |
2095 | int i; | |
2096 | ||
2097 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2098 | struct virtqueue *vq = vi->sq[i].vq; | |
56434a01 | 2099 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { |
b68df015 | 2100 | if (!is_xdp_raw_buffer_queue(vi, i)) |
56434a01 JF |
2101 | dev_kfree_skb(buf); |
2102 | else | |
2103 | put_page(virt_to_head_page(buf)); | |
2104 | } | |
986a4f4d JW |
2105 | } |
2106 | ||
2107 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2108 | struct virtqueue *vq = vi->rq[i].vq; | |
2109 | ||
2110 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
ab7db917 MD |
2111 | if (vi->mergeable_rx_bufs) { |
2112 | unsigned long ctx = (unsigned long)buf; | |
2113 | void *base = mergeable_ctx_to_buf_address(ctx); | |
2114 | put_page(virt_to_head_page(base)); | |
2115 | } else if (vi->big_packets) { | |
fa9fac17 | 2116 | give_pages(&vi->rq[i], buf); |
ab7db917 | 2117 | } else { |
f6b10209 | 2118 | put_page(virt_to_head_page(buf)); |
ab7db917 | 2119 | } |
986a4f4d | 2120 | } |
986a4f4d JW |
2121 | } |
2122 | } | |
2123 | ||
e9d7417b JW |
2124 | static void virtnet_del_vqs(struct virtnet_info *vi) |
2125 | { | |
2126 | struct virtio_device *vdev = vi->vdev; | |
2127 | ||
8898c21c | 2128 | virtnet_clean_affinity(vi, -1); |
986a4f4d | 2129 | |
e9d7417b | 2130 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
2131 | |
2132 | virtnet_free_queues(vi); | |
e9d7417b JW |
2133 | } |
2134 | ||
986a4f4d | 2135 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 2136 | { |
986a4f4d JW |
2137 | vq_callback_t **callbacks; |
2138 | struct virtqueue **vqs; | |
2139 | int ret = -ENOMEM; | |
2140 | int i, total_vqs; | |
2141 | const char **names; | |
2142 | ||
2143 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
2144 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
2145 | * possible control vq. | |
2146 | */ | |
2147 | total_vqs = vi->max_queue_pairs * 2 + | |
2148 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
2149 | ||
2150 | /* Allocate space for find_vqs parameters */ | |
2151 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
2152 | if (!vqs) | |
2153 | goto err_vq; | |
2154 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
2155 | if (!callbacks) | |
2156 | goto err_callback; | |
2157 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
2158 | if (!names) | |
2159 | goto err_names; | |
2160 | ||
2161 | /* Parameters for control virtqueue, if any */ | |
2162 | if (vi->has_cvq) { | |
2163 | callbacks[total_vqs - 1] = NULL; | |
2164 | names[total_vqs - 1] = "control"; | |
2165 | } | |
3f9c10b0 | 2166 | |
986a4f4d JW |
2167 | /* Allocate/initialize parameters for send/receive virtqueues */ |
2168 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2169 | callbacks[rxq2vq(i)] = skb_recv_done; | |
2170 | callbacks[txq2vq(i)] = skb_xmit_done; | |
2171 | sprintf(vi->rq[i].name, "input.%d", i); | |
2172 | sprintf(vi->sq[i].name, "output.%d", i); | |
2173 | names[rxq2vq(i)] = vi->rq[i].name; | |
2174 | names[txq2vq(i)] = vi->sq[i].name; | |
2175 | } | |
3f9c10b0 | 2176 | |
986a4f4d | 2177 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
fb5e31d9 | 2178 | names, NULL); |
986a4f4d JW |
2179 | if (ret) |
2180 | goto err_find; | |
3f9c10b0 | 2181 | |
986a4f4d JW |
2182 | if (vi->has_cvq) { |
2183 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 2184 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 2185 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 2186 | } |
986a4f4d JW |
2187 | |
2188 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2189 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
2190 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
2191 | } | |
2192 | ||
2193 | kfree(names); | |
2194 | kfree(callbacks); | |
2195 | kfree(vqs); | |
2196 | ||
3f9c10b0 | 2197 | return 0; |
986a4f4d JW |
2198 | |
2199 | err_find: | |
2200 | kfree(names); | |
2201 | err_names: | |
2202 | kfree(callbacks); | |
2203 | err_callback: | |
2204 | kfree(vqs); | |
2205 | err_vq: | |
2206 | return ret; | |
2207 | } | |
2208 | ||
2209 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
2210 | { | |
2211 | int i; | |
2212 | ||
2213 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
2214 | if (!vi->sq) | |
2215 | goto err_sq; | |
2216 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 2217 | if (!vi->rq) |
986a4f4d JW |
2218 | goto err_rq; |
2219 | ||
2220 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
2221 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2222 | vi->rq[i].pages = NULL; | |
2223 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
2224 | napi_weight); | |
b92f1e67 WB |
2225 | netif_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx, |
2226 | napi_tx ? napi_weight : 0); | |
986a4f4d JW |
2227 | |
2228 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
5377d758 | 2229 | ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); |
986a4f4d JW |
2230 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); |
2231 | } | |
2232 | ||
2233 | return 0; | |
2234 | ||
2235 | err_rq: | |
2236 | kfree(vi->sq); | |
2237 | err_sq: | |
2238 | return -ENOMEM; | |
2239 | } | |
2240 | ||
2241 | static int init_vqs(struct virtnet_info *vi) | |
2242 | { | |
2243 | int ret; | |
2244 | ||
2245 | /* Allocate send & receive queues */ | |
2246 | ret = virtnet_alloc_queues(vi); | |
2247 | if (ret) | |
2248 | goto err; | |
2249 | ||
2250 | ret = virtnet_find_vqs(vi); | |
2251 | if (ret) | |
2252 | goto err_free; | |
2253 | ||
47be2479 | 2254 | get_online_cpus(); |
8898c21c | 2255 | virtnet_set_affinity(vi); |
47be2479 WG |
2256 | put_online_cpus(); |
2257 | ||
986a4f4d JW |
2258 | return 0; |
2259 | ||
2260 | err_free: | |
2261 | virtnet_free_queues(vi); | |
2262 | err: | |
2263 | return ret; | |
3f9c10b0 AS |
2264 | } |
2265 | ||
fbf28d78 MD |
2266 | #ifdef CONFIG_SYSFS |
2267 | static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, | |
2268 | struct rx_queue_attribute *attribute, char *buf) | |
2269 | { | |
2270 | struct virtnet_info *vi = netdev_priv(queue->dev); | |
2271 | unsigned int queue_index = get_netdev_rx_queue_index(queue); | |
5377d758 | 2272 | struct ewma_pkt_len *avg; |
fbf28d78 MD |
2273 | |
2274 | BUG_ON(queue_index >= vi->max_queue_pairs); | |
2275 | avg = &vi->rq[queue_index].mrg_avg_pkt_len; | |
2276 | return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); | |
2277 | } | |
2278 | ||
2279 | static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = | |
2280 | __ATTR_RO(mergeable_rx_buffer_size); | |
2281 | ||
2282 | static struct attribute *virtio_net_mrg_rx_attrs[] = { | |
2283 | &mergeable_rx_buffer_size_attribute.attr, | |
2284 | NULL | |
2285 | }; | |
2286 | ||
2287 | static const struct attribute_group virtio_net_mrg_rx_group = { | |
2288 | .name = "virtio_net", | |
2289 | .attrs = virtio_net_mrg_rx_attrs | |
2290 | }; | |
2291 | #endif | |
2292 | ||
892d6eb1 JW |
2293 | static bool virtnet_fail_on_feature(struct virtio_device *vdev, |
2294 | unsigned int fbit, | |
2295 | const char *fname, const char *dname) | |
2296 | { | |
2297 | if (!virtio_has_feature(vdev, fbit)) | |
2298 | return false; | |
2299 | ||
2300 | dev_err(&vdev->dev, "device advertises feature %s but not %s", | |
2301 | fname, dname); | |
2302 | ||
2303 | return true; | |
2304 | } | |
2305 | ||
2306 | #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ | |
2307 | virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) | |
2308 | ||
2309 | static bool virtnet_validate_features(struct virtio_device *vdev) | |
2310 | { | |
2311 | if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && | |
2312 | (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, | |
2313 | "VIRTIO_NET_F_CTRL_VQ") || | |
2314 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, | |
2315 | "VIRTIO_NET_F_CTRL_VQ") || | |
2316 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, | |
2317 | "VIRTIO_NET_F_CTRL_VQ") || | |
2318 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || | |
2319 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, | |
2320 | "VIRTIO_NET_F_CTRL_VQ"))) { | |
2321 | return false; | |
2322 | } | |
2323 | ||
2324 | return true; | |
2325 | } | |
2326 | ||
d0c2c997 JW |
2327 | #define MIN_MTU ETH_MIN_MTU |
2328 | #define MAX_MTU ETH_MAX_MTU | |
2329 | ||
fe36cbe0 | 2330 | static int virtnet_validate(struct virtio_device *vdev) |
296f96fc | 2331 | { |
6ba42248 MT |
2332 | if (!vdev->config->get) { |
2333 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
2334 | __func__); | |
2335 | return -EINVAL; | |
2336 | } | |
2337 | ||
892d6eb1 JW |
2338 | if (!virtnet_validate_features(vdev)) |
2339 | return -EINVAL; | |
2340 | ||
fe36cbe0 MT |
2341 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
2342 | int mtu = virtio_cread16(vdev, | |
2343 | offsetof(struct virtio_net_config, | |
2344 | mtu)); | |
2345 | if (mtu < MIN_MTU) | |
2346 | __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); | |
2347 | } | |
2348 | ||
2349 | return 0; | |
2350 | } | |
2351 | ||
2352 | static int virtnet_probe(struct virtio_device *vdev) | |
2353 | { | |
2354 | int i, err; | |
2355 | struct net_device *dev; | |
2356 | struct virtnet_info *vi; | |
2357 | u16 max_queue_pairs; | |
2358 | int mtu; | |
2359 | ||
986a4f4d | 2360 | /* Find if host supports multiqueue virtio_net device */ |
855e0c52 RR |
2361 | err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, |
2362 | struct virtio_net_config, | |
2363 | max_virtqueue_pairs, &max_queue_pairs); | |
986a4f4d JW |
2364 | |
2365 | /* We need at least 2 queue's */ | |
2366 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
2367 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
2368 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
2369 | max_queue_pairs = 1; | |
296f96fc RR |
2370 | |
2371 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 2372 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
2373 | if (!dev) |
2374 | return -ENOMEM; | |
2375 | ||
2376 | /* Set up network device as normal. */ | |
f2f2c8b4 | 2377 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 2378 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 2379 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 2380 | |
7ad24ea4 | 2381 | dev->ethtool_ops = &virtnet_ethtool_ops; |
296f96fc RR |
2382 | SET_NETDEV_DEV(dev, &vdev->dev); |
2383 | ||
2384 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 2385 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 2386 | /* This opens up the world of extra features. */ |
48900cb6 | 2387 | dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 | 2388 | if (csum) |
48900cb6 | 2389 | dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 MM |
2390 | |
2391 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
e3e3c423 | 2392 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO |
34a48579 RR |
2393 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
2394 | } | |
5539ae96 | 2395 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
2396 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
2397 | dev->hw_features |= NETIF_F_TSO; | |
2398 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
2399 | dev->hw_features |= NETIF_F_TSO6; | |
2400 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
2401 | dev->hw_features |= NETIF_F_TSO_ECN; | |
e3e3c423 VY |
2402 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
2403 | dev->hw_features |= NETIF_F_UFO; | |
98e778c9 | 2404 | |
41f2f127 JW |
2405 | dev->features |= NETIF_F_GSO_ROBUST; |
2406 | ||
98e778c9 | 2407 | if (gso) |
e3e3c423 | 2408 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); |
98e778c9 | 2409 | /* (!csum && gso) case will be fixed by register_netdev() */ |
296f96fc | 2410 | } |
4f49129b TH |
2411 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
2412 | dev->features |= NETIF_F_RXCSUM; | |
296f96fc | 2413 | |
4fda8302 JW |
2414 | dev->vlan_features = dev->features; |
2415 | ||
d0c2c997 JW |
2416 | /* MTU range: 68 - 65535 */ |
2417 | dev->min_mtu = MIN_MTU; | |
2418 | dev->max_mtu = MAX_MTU; | |
2419 | ||
296f96fc | 2420 | /* Configuration may specify what MAC to use. Otherwise random. */ |
855e0c52 RR |
2421 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
2422 | virtio_cread_bytes(vdev, | |
2423 | offsetof(struct virtio_net_config, mac), | |
2424 | dev->dev_addr, dev->addr_len); | |
2425 | else | |
f2cedb63 | 2426 | eth_hw_addr_random(dev); |
296f96fc RR |
2427 | |
2428 | /* Set up our device-specific information */ | |
2429 | vi = netdev_priv(dev); | |
296f96fc RR |
2430 | vi->dev = dev; |
2431 | vi->vdev = vdev; | |
d9d5dcc8 | 2432 | vdev->priv = vi; |
3fa2a1df | 2433 | vi->stats = alloc_percpu(struct virtnet_stats); |
2434 | err = -ENOMEM; | |
2435 | if (vi->stats == NULL) | |
2436 | goto free; | |
2437 | ||
827da44c JS |
2438 | for_each_possible_cpu(i) { |
2439 | struct virtnet_stats *virtnet_stats; | |
2440 | virtnet_stats = per_cpu_ptr(vi->stats, i); | |
2441 | u64_stats_init(&virtnet_stats->tx_syncp); | |
2442 | u64_stats_init(&virtnet_stats->rx_syncp); | |
2443 | } | |
2444 | ||
586d17c5 | 2445 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); |
296f96fc | 2446 | |
97402b96 | 2447 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
2448 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
2449 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
e3e3c423 VY |
2450 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
2451 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) | |
97402b96 HX |
2452 | vi->big_packets = true; |
2453 | ||
3f2c31d9 MM |
2454 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
2455 | vi->mergeable_rx_bufs = true; | |
2456 | ||
d04302b3 MT |
2457 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || |
2458 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
012873d0 MT |
2459 | vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
2460 | else | |
2461 | vi->hdr_len = sizeof(struct virtio_net_hdr); | |
2462 | ||
75993300 MT |
2463 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || |
2464 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
e7428e95 MT |
2465 | vi->any_header_sg = true; |
2466 | ||
986a4f4d JW |
2467 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
2468 | vi->has_cvq = true; | |
2469 | ||
14de9d11 AC |
2470 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
2471 | mtu = virtio_cread16(vdev, | |
2472 | offsetof(struct virtio_net_config, | |
2473 | mtu)); | |
93a205ee | 2474 | if (mtu < dev->min_mtu) { |
fe36cbe0 MT |
2475 | /* Should never trigger: MTU was previously validated |
2476 | * in virtnet_validate. | |
2477 | */ | |
2478 | dev_err(&vdev->dev, "device MTU appears to have changed " | |
2479 | "it is now %d < %d", mtu, dev->min_mtu); | |
2480 | goto free_stats; | |
93a205ee | 2481 | } |
2e123b44 | 2482 | |
fe36cbe0 MT |
2483 | dev->mtu = mtu; |
2484 | dev->max_mtu = mtu; | |
2485 | ||
2e123b44 MT |
2486 | /* TODO: size buffers correctly in this case. */ |
2487 | if (dev->mtu > ETH_DATA_LEN) | |
2488 | vi->big_packets = true; | |
14de9d11 AC |
2489 | } |
2490 | ||
012873d0 MT |
2491 | if (vi->any_header_sg) |
2492 | dev->needed_headroom = vi->hdr_len; | |
6ebbc1a6 | 2493 | |
44900010 JW |
2494 | /* Enable multiqueue by default */ |
2495 | if (num_online_cpus() >= max_queue_pairs) | |
2496 | vi->curr_queue_pairs = max_queue_pairs; | |
2497 | else | |
2498 | vi->curr_queue_pairs = num_online_cpus(); | |
986a4f4d JW |
2499 | vi->max_queue_pairs = max_queue_pairs; |
2500 | ||
2501 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 2502 | err = init_vqs(vi); |
d2a7ddda | 2503 | if (err) |
9bb8ca86 | 2504 | goto free_stats; |
296f96fc | 2505 | |
fbf28d78 MD |
2506 | #ifdef CONFIG_SYSFS |
2507 | if (vi->mergeable_rx_bufs) | |
2508 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; | |
2509 | #endif | |
0f13b66b ZYW |
2510 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
2511 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); | |
986a4f4d | 2512 | |
16032be5 NA |
2513 | virtnet_init_settings(dev); |
2514 | ||
296f96fc RR |
2515 | err = register_netdev(dev); |
2516 | if (err) { | |
2517 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 2518 | goto free_vqs; |
296f96fc | 2519 | } |
b3369c1f | 2520 | |
4baf1e33 MT |
2521 | virtio_device_ready(vdev); |
2522 | ||
8017c279 | 2523 | err = virtnet_cpu_notif_add(vi); |
8de4b2f3 WG |
2524 | if (err) { |
2525 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
f00e35e2 | 2526 | goto free_unregister_netdev; |
8de4b2f3 WG |
2527 | } |
2528 | ||
a220871b | 2529 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
44900010 | 2530 | |
167c25e4 JW |
2531 | /* Assume link up if device can't report link status, |
2532 | otherwise get link status from config. */ | |
2533 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
2534 | netif_carrier_off(dev); | |
3b07e9ca | 2535 | schedule_work(&vi->config_work); |
167c25e4 JW |
2536 | } else { |
2537 | vi->status = VIRTIO_NET_S_LINK_UP; | |
2538 | netif_carrier_on(dev); | |
2539 | } | |
9f4d26d0 | 2540 | |
986a4f4d JW |
2541 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
2542 | dev->name, max_queue_pairs); | |
2543 | ||
296f96fc RR |
2544 | return 0; |
2545 | ||
f00e35e2 | 2546 | free_unregister_netdev: |
02465555 MT |
2547 | vi->vdev->config->reset(vdev); |
2548 | ||
b3369c1f | 2549 | unregister_netdev(dev); |
d2a7ddda | 2550 | free_vqs: |
986a4f4d | 2551 | cancel_delayed_work_sync(&vi->refill); |
fb51879d | 2552 | free_receive_page_frags(vi); |
e9d7417b | 2553 | virtnet_del_vqs(vi); |
3fa2a1df | 2554 | free_stats: |
2555 | free_percpu(vi->stats); | |
296f96fc RR |
2556 | free: |
2557 | free_netdev(dev); | |
2558 | return err; | |
2559 | } | |
2560 | ||
2de2f7f4 JF |
2561 | static void _remove_vq_common(struct virtnet_info *vi) |
2562 | { | |
2563 | vi->vdev->config->reset(vi->vdev); | |
2564 | free_unused_bufs(vi); | |
2565 | _free_receive_bufs(vi); | |
2566 | free_receive_page_frags(vi); | |
2567 | virtnet_del_vqs(vi); | |
2568 | } | |
2569 | ||
04486ed0 | 2570 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 2571 | { |
04486ed0 | 2572 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
2573 | |
2574 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 2575 | free_unused_bufs(vi); |
fb6813f4 | 2576 | |
986a4f4d | 2577 | free_receive_bufs(vi); |
d2a7ddda | 2578 | |
fb51879d MD |
2579 | free_receive_page_frags(vi); |
2580 | ||
986a4f4d | 2581 | virtnet_del_vqs(vi); |
04486ed0 AS |
2582 | } |
2583 | ||
8cc085d6 | 2584 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
2585 | { |
2586 | struct virtnet_info *vi = vdev->priv; | |
2587 | ||
8017c279 | 2588 | virtnet_cpu_notif_remove(vi); |
8de4b2f3 | 2589 | |
102a2786 MT |
2590 | /* Make sure no work handler is accessing the device. */ |
2591 | flush_work(&vi->config_work); | |
586d17c5 | 2592 | |
04486ed0 AS |
2593 | unregister_netdev(vi->dev); |
2594 | ||
2595 | remove_vq_common(vi); | |
fb6813f4 | 2596 | |
2e66f55b | 2597 | free_percpu(vi->stats); |
74b2553f | 2598 | free_netdev(vi->dev); |
296f96fc RR |
2599 | } |
2600 | ||
89107000 | 2601 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
2602 | static int virtnet_freeze(struct virtio_device *vdev) |
2603 | { | |
2604 | struct virtnet_info *vi = vdev->priv; | |
2605 | ||
8017c279 | 2606 | virtnet_cpu_notif_remove(vi); |
9fe7bfce | 2607 | virtnet_freeze_down(vdev); |
0741bcb5 AS |
2608 | remove_vq_common(vi); |
2609 | ||
2610 | return 0; | |
2611 | } | |
2612 | ||
2613 | static int virtnet_restore(struct virtio_device *vdev) | |
2614 | { | |
2615 | struct virtnet_info *vi = vdev->priv; | |
9fe7bfce | 2616 | int err; |
0741bcb5 | 2617 | |
9fe7bfce | 2618 | err = virtnet_restore_up(vdev); |
0741bcb5 AS |
2619 | if (err) |
2620 | return err; | |
986a4f4d JW |
2621 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
2622 | ||
8017c279 | 2623 | err = virtnet_cpu_notif_add(vi); |
ec9debbd JW |
2624 | if (err) |
2625 | return err; | |
2626 | ||
0741bcb5 AS |
2627 | return 0; |
2628 | } | |
2629 | #endif | |
2630 | ||
296f96fc RR |
2631 | static struct virtio_device_id id_table[] = { |
2632 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
2633 | { 0 }, | |
2634 | }; | |
2635 | ||
f3358507 MT |
2636 | #define VIRTNET_FEATURES \ |
2637 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ | |
2638 | VIRTIO_NET_F_MAC, \ | |
2639 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ | |
2640 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ | |
2641 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ | |
2642 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ | |
2643 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ | |
2644 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ | |
2645 | VIRTIO_NET_F_CTRL_MAC_ADDR, \ | |
2646 | VIRTIO_NET_F_MTU | |
2647 | ||
c45a6816 | 2648 | static unsigned int features[] = { |
f3358507 MT |
2649 | VIRTNET_FEATURES, |
2650 | }; | |
2651 | ||
2652 | static unsigned int features_legacy[] = { | |
2653 | VIRTNET_FEATURES, | |
2654 | VIRTIO_NET_F_GSO, | |
e7428e95 | 2655 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
2656 | }; |
2657 | ||
22402529 | 2658 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
2659 | .feature_table = features, |
2660 | .feature_table_size = ARRAY_SIZE(features), | |
f3358507 MT |
2661 | .feature_table_legacy = features_legacy, |
2662 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), | |
296f96fc RR |
2663 | .driver.name = KBUILD_MODNAME, |
2664 | .driver.owner = THIS_MODULE, | |
2665 | .id_table = id_table, | |
fe36cbe0 | 2666 | .validate = virtnet_validate, |
296f96fc | 2667 | .probe = virtnet_probe, |
8cc085d6 | 2668 | .remove = virtnet_remove, |
9f4d26d0 | 2669 | .config_changed = virtnet_config_changed, |
89107000 | 2670 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
2671 | .freeze = virtnet_freeze, |
2672 | .restore = virtnet_restore, | |
2673 | #endif | |
296f96fc RR |
2674 | }; |
2675 | ||
8017c279 SAS |
2676 | static __init int virtio_net_driver_init(void) |
2677 | { | |
2678 | int ret; | |
2679 | ||
73c1b41e | 2680 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", |
8017c279 SAS |
2681 | virtnet_cpu_online, |
2682 | virtnet_cpu_down_prep); | |
2683 | if (ret < 0) | |
2684 | goto out; | |
2685 | virtionet_online = ret; | |
73c1b41e | 2686 | ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", |
8017c279 SAS |
2687 | NULL, virtnet_cpu_dead); |
2688 | if (ret) | |
2689 | goto err_dead; | |
2690 | ||
2691 | ret = register_virtio_driver(&virtio_net_driver); | |
2692 | if (ret) | |
2693 | goto err_virtio; | |
2694 | return 0; | |
2695 | err_virtio: | |
2696 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); | |
2697 | err_dead: | |
2698 | cpuhp_remove_multi_state(virtionet_online); | |
2699 | out: | |
2700 | return ret; | |
2701 | } | |
2702 | module_init(virtio_net_driver_init); | |
2703 | ||
2704 | static __exit void virtio_net_driver_exit(void) | |
2705 | { | |
2706 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); | |
2707 | cpuhp_remove_multi_state(virtionet_online); | |
2708 | unregister_virtio_driver(&virtio_net_driver); | |
2709 | } | |
2710 | module_exit(virtio_net_driver_exit); | |
296f96fc RR |
2711 | |
2712 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2713 | MODULE_DESCRIPTION("Virtio network driver"); | |
2714 | MODULE_LICENSE("GPL"); |