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1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
48925e37 | 2 | /* A network driver using virtio. |
296f96fc RR |
3 | * |
4 | * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation | |
296f96fc RR |
5 | */ |
6 | //#define DEBUG | |
7 | #include <linux/netdevice.h> | |
8 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 9 | #include <linux/ethtool.h> |
296f96fc RR |
10 | #include <linux/module.h> |
11 | #include <linux/virtio.h> | |
12 | #include <linux/virtio_net.h> | |
f600b690 | 13 | #include <linux/bpf.h> |
a67edbf4 | 14 | #include <linux/bpf_trace.h> |
296f96fc | 15 | #include <linux/scatterlist.h> |
e918085a | 16 | #include <linux/if_vlan.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
8de4b2f3 | 18 | #include <linux/cpu.h> |
ab7db917 | 19 | #include <linux/average.h> |
186b3c99 | 20 | #include <linux/filter.h> |
2ca653d6 | 21 | #include <linux/kernel.h> |
d85b758f | 22 | #include <net/route.h> |
754b8a21 | 23 | #include <net/xdp.h> |
ba5e4426 | 24 | #include <net/net_failover.h> |
296f96fc | 25 | |
d34710e3 | 26 | static int napi_weight = NAPI_POLL_WEIGHT; |
6c0cd7c0 DL |
27 | module_param(napi_weight, int, 0444); |
28 | ||
31c03aef | 29 | static bool csum = true, gso = true, napi_tx = true; |
34a48579 RR |
30 | module_param(csum, bool, 0444); |
31 | module_param(gso, bool, 0444); | |
b92f1e67 | 32 | module_param(napi_tx, bool, 0644); |
34a48579 | 33 | |
296f96fc | 34 | /* FIXME: MTU in config. */ |
5061de36 | 35 | #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 36 | #define GOOD_COPY_LEN 128 |
296f96fc | 37 | |
f6b10209 JW |
38 | #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
39 | ||
2de2f7f4 JF |
40 | /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */ |
41 | #define VIRTIO_XDP_HEADROOM 256 | |
42 | ||
2471c75e JDB |
43 | /* Separating two types of XDP xmit */ |
44 | #define VIRTIO_XDP_TX BIT(0) | |
45 | #define VIRTIO_XDP_REDIR BIT(1) | |
46 | ||
5050471d TM |
47 | #define VIRTIO_XDP_FLAG BIT(0) |
48 | ||
5377d758 JB |
49 | /* RX packet size EWMA. The average packet size is used to determine the packet |
50 | * buffer size when refilling RX rings. As the entire RX ring may be refilled | |
51 | * at once, the weight is chosen so that the EWMA will be insensitive to short- | |
52 | * term, transient changes in packet size. | |
ab7db917 | 53 | */ |
eb1e011a | 54 | DECLARE_EWMA(pkt_len, 0, 64) |
ab7db917 | 55 | |
66846048 | 56 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 57 | |
7acd4329 CIK |
58 | static const unsigned long guest_offloads[] = { |
59 | VIRTIO_NET_F_GUEST_TSO4, | |
60 | VIRTIO_NET_F_GUEST_TSO6, | |
61 | VIRTIO_NET_F_GUEST_ECN, | |
e59ff2c4 JW |
62 | VIRTIO_NET_F_GUEST_UFO, |
63 | VIRTIO_NET_F_GUEST_CSUM | |
7acd4329 | 64 | }; |
3f93522f | 65 | |
1a03b8a3 TZ |
66 | #define GUEST_OFFLOAD_LRO_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \ |
67 | (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \ | |
68 | (1ULL << VIRTIO_NET_F_GUEST_ECN) | \ | |
69 | (1ULL << VIRTIO_NET_F_GUEST_UFO)) | |
70 | ||
d7dfc5cf TM |
71 | struct virtnet_stat_desc { |
72 | char desc[ETH_GSTRING_LEN]; | |
73 | size_t offset; | |
3fa2a1df | 74 | }; |
75 | ||
d7dfc5cf TM |
76 | struct virtnet_sq_stats { |
77 | struct u64_stats_sync syncp; | |
78 | u64 packets; | |
79 | u64 bytes; | |
5b8f3c8d TM |
80 | u64 xdp_tx; |
81 | u64 xdp_tx_drops; | |
461f03dc | 82 | u64 kicks; |
d7dfc5cf TM |
83 | }; |
84 | ||
d46eeeaf JW |
85 | struct virtnet_rq_stats { |
86 | struct u64_stats_sync syncp; | |
d7dfc5cf TM |
87 | u64 packets; |
88 | u64 bytes; | |
2c4a2f7d | 89 | u64 drops; |
5b8f3c8d TM |
90 | u64 xdp_packets; |
91 | u64 xdp_tx; | |
92 | u64 xdp_redirects; | |
93 | u64 xdp_drops; | |
461f03dc | 94 | u64 kicks; |
d7dfc5cf TM |
95 | }; |
96 | ||
97 | #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m) | |
d46eeeaf | 98 | #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m) |
d7dfc5cf TM |
99 | |
100 | static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = { | |
5b8f3c8d TM |
101 | { "packets", VIRTNET_SQ_STAT(packets) }, |
102 | { "bytes", VIRTNET_SQ_STAT(bytes) }, | |
103 | { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) }, | |
104 | { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) }, | |
461f03dc | 105 | { "kicks", VIRTNET_SQ_STAT(kicks) }, |
d7dfc5cf TM |
106 | }; |
107 | ||
108 | static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = { | |
5b8f3c8d TM |
109 | { "packets", VIRTNET_RQ_STAT(packets) }, |
110 | { "bytes", VIRTNET_RQ_STAT(bytes) }, | |
111 | { "drops", VIRTNET_RQ_STAT(drops) }, | |
112 | { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) }, | |
113 | { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) }, | |
114 | { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) }, | |
115 | { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) }, | |
461f03dc | 116 | { "kicks", VIRTNET_RQ_STAT(kicks) }, |
d7dfc5cf TM |
117 | }; |
118 | ||
119 | #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc) | |
120 | #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc) | |
121 | ||
e9d7417b JW |
122 | /* Internal representation of a send virtqueue */ |
123 | struct send_queue { | |
124 | /* Virtqueue associated with this send _queue */ | |
125 | struct virtqueue *vq; | |
126 | ||
127 | /* TX: fragments + linear part + virtio header */ | |
128 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
129 | |
130 | /* Name of the send queue: output.$index */ | |
131 | char name[40]; | |
b92f1e67 | 132 | |
d7dfc5cf TM |
133 | struct virtnet_sq_stats stats; |
134 | ||
b92f1e67 | 135 | struct napi_struct napi; |
e9d7417b JW |
136 | }; |
137 | ||
138 | /* Internal representation of a receive virtqueue */ | |
139 | struct receive_queue { | |
140 | /* Virtqueue associated with this receive_queue */ | |
141 | struct virtqueue *vq; | |
142 | ||
296f96fc RR |
143 | struct napi_struct napi; |
144 | ||
f600b690 JF |
145 | struct bpf_prog __rcu *xdp_prog; |
146 | ||
d7dfc5cf TM |
147 | struct virtnet_rq_stats stats; |
148 | ||
e9d7417b JW |
149 | /* Chain pages by the private ptr. */ |
150 | struct page *pages; | |
151 | ||
ab7db917 | 152 | /* Average packet length for mergeable receive buffers. */ |
5377d758 | 153 | struct ewma_pkt_len mrg_avg_pkt_len; |
ab7db917 | 154 | |
fb51879d MD |
155 | /* Page frag for packet buffer allocation. */ |
156 | struct page_frag alloc_frag; | |
157 | ||
e9d7417b JW |
158 | /* RX: fragments + linear part + virtio header */ |
159 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d | 160 | |
d85b758f MT |
161 | /* Min single buffer size for mergeable buffers case. */ |
162 | unsigned int min_buf_len; | |
163 | ||
986a4f4d JW |
164 | /* Name of this receive queue: input.$index */ |
165 | char name[40]; | |
754b8a21 JDB |
166 | |
167 | struct xdp_rxq_info xdp_rxq; | |
e9d7417b JW |
168 | }; |
169 | ||
12e57169 MT |
170 | /* Control VQ buffers: protected by the rtnl lock */ |
171 | struct control_buf { | |
172 | struct virtio_net_ctrl_hdr hdr; | |
173 | virtio_net_ctrl_ack status; | |
174 | struct virtio_net_ctrl_mq mq; | |
175 | u8 promisc; | |
176 | u8 allmulti; | |
d7fad4c8 | 177 | __virtio16 vid; |
f4ee703a | 178 | __virtio64 offloads; |
12e57169 MT |
179 | }; |
180 | ||
e9d7417b JW |
181 | struct virtnet_info { |
182 | struct virtio_device *vdev; | |
183 | struct virtqueue *cvq; | |
184 | struct net_device *dev; | |
986a4f4d JW |
185 | struct send_queue *sq; |
186 | struct receive_queue *rq; | |
e9d7417b JW |
187 | unsigned int status; |
188 | ||
986a4f4d JW |
189 | /* Max # of queue pairs supported by the device */ |
190 | u16 max_queue_pairs; | |
191 | ||
192 | /* # of queue pairs currently used by the driver */ | |
193 | u16 curr_queue_pairs; | |
194 | ||
672aafd5 JF |
195 | /* # of XDP queue pairs currently used by the driver */ |
196 | u16 xdp_queue_pairs; | |
197 | ||
97402b96 HX |
198 | /* I like... big packets and I cannot lie! */ |
199 | bool big_packets; | |
200 | ||
3f2c31d9 MM |
201 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
202 | bool mergeable_rx_bufs; | |
203 | ||
986a4f4d JW |
204 | /* Has control virtqueue */ |
205 | bool has_cvq; | |
206 | ||
e7428e95 MT |
207 | /* Host can handle any s/g split between our header and packet data */ |
208 | bool any_header_sg; | |
209 | ||
012873d0 MT |
210 | /* Packet virtio header size */ |
211 | u8 hdr_len; | |
212 | ||
3161e453 RR |
213 | /* Work struct for refilling if we run low on memory. */ |
214 | struct delayed_work refill; | |
215 | ||
586d17c5 JW |
216 | /* Work struct for config space updates */ |
217 | struct work_struct config_work; | |
218 | ||
986a4f4d JW |
219 | /* Does the affinity hint is set for virtqueues? */ |
220 | bool affinity_hint_set; | |
47be2479 | 221 | |
8017c279 SAS |
222 | /* CPU hotplug instances for online & dead */ |
223 | struct hlist_node node; | |
224 | struct hlist_node node_dead; | |
2ac46030 | 225 | |
12e57169 | 226 | struct control_buf *ctrl; |
16032be5 NA |
227 | |
228 | /* Ethtool settings */ | |
229 | u8 duplex; | |
230 | u32 speed; | |
3f93522f JW |
231 | |
232 | unsigned long guest_offloads; | |
a02e8964 | 233 | unsigned long guest_offloads_capable; |
ba5e4426 SS |
234 | |
235 | /* failover when STANDBY feature enabled */ | |
236 | struct failover *failover; | |
296f96fc RR |
237 | }; |
238 | ||
9ab86bbc | 239 | struct padded_vnet_hdr { |
012873d0 | 240 | struct virtio_net_hdr_mrg_rxbuf hdr; |
9ab86bbc | 241 | /* |
012873d0 MT |
242 | * hdr is in a separate sg buffer, and data sg buffer shares same page |
243 | * with this header sg. This padding makes next sg 16 byte aligned | |
244 | * after the header. | |
9ab86bbc | 245 | */ |
012873d0 | 246 | char padding[4]; |
9ab86bbc SM |
247 | }; |
248 | ||
5050471d TM |
249 | static bool is_xdp_frame(void *ptr) |
250 | { | |
251 | return (unsigned long)ptr & VIRTIO_XDP_FLAG; | |
252 | } | |
253 | ||
254 | static void *xdp_to_ptr(struct xdp_frame *ptr) | |
255 | { | |
256 | return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG); | |
257 | } | |
258 | ||
259 | static struct xdp_frame *ptr_to_xdp(void *ptr) | |
260 | { | |
261 | return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG); | |
262 | } | |
263 | ||
986a4f4d JW |
264 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
265 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
266 | */ | |
267 | static int vq2txq(struct virtqueue *vq) | |
268 | { | |
9d0ca6ed | 269 | return (vq->index - 1) / 2; |
986a4f4d JW |
270 | } |
271 | ||
272 | static int txq2vq(int txq) | |
273 | { | |
274 | return txq * 2 + 1; | |
275 | } | |
276 | ||
277 | static int vq2rxq(struct virtqueue *vq) | |
278 | { | |
9d0ca6ed | 279 | return vq->index / 2; |
986a4f4d JW |
280 | } |
281 | ||
282 | static int rxq2vq(int rxq) | |
283 | { | |
284 | return rxq * 2; | |
285 | } | |
286 | ||
012873d0 | 287 | static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 288 | { |
012873d0 | 289 | return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; |
296f96fc RR |
290 | } |
291 | ||
9ab86bbc SM |
292 | /* |
293 | * private is used to chain pages for big packets, put the whole | |
294 | * most recent used list in the beginning for reuse | |
295 | */ | |
e9d7417b | 296 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 297 | { |
9ab86bbc | 298 | struct page *end; |
0a888fd1 | 299 | |
e9d7417b | 300 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 301 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
302 | end->private = (unsigned long)rq->pages; |
303 | rq->pages = page; | |
0a888fd1 MM |
304 | } |
305 | ||
e9d7417b | 306 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 307 | { |
e9d7417b | 308 | struct page *p = rq->pages; |
fb6813f4 | 309 | |
9ab86bbc | 310 | if (p) { |
e9d7417b | 311 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
312 | /* clear private here, it is used to chain pages */ |
313 | p->private = 0; | |
314 | } else | |
fb6813f4 RR |
315 | p = alloc_page(gfp_mask); |
316 | return p; | |
317 | } | |
318 | ||
e4e8452a WB |
319 | static void virtqueue_napi_schedule(struct napi_struct *napi, |
320 | struct virtqueue *vq) | |
321 | { | |
322 | if (napi_schedule_prep(napi)) { | |
323 | virtqueue_disable_cb(vq); | |
324 | __napi_schedule(napi); | |
325 | } | |
326 | } | |
327 | ||
328 | static void virtqueue_napi_complete(struct napi_struct *napi, | |
329 | struct virtqueue *vq, int processed) | |
330 | { | |
331 | int opaque; | |
332 | ||
333 | opaque = virtqueue_enable_cb_prepare(vq); | |
fdaa767a TM |
334 | if (napi_complete_done(napi, processed)) { |
335 | if (unlikely(virtqueue_poll(vq, opaque))) | |
336 | virtqueue_napi_schedule(napi, vq); | |
337 | } else { | |
338 | virtqueue_disable_cb(vq); | |
339 | } | |
e4e8452a WB |
340 | } |
341 | ||
e9d7417b | 342 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 343 | { |
e9d7417b | 344 | struct virtnet_info *vi = vq->vdev->priv; |
b92f1e67 | 345 | struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; |
296f96fc | 346 | |
2cb9c6ba | 347 | /* Suppress further interrupts. */ |
e9d7417b | 348 | virtqueue_disable_cb(vq); |
11a3a154 | 349 | |
b92f1e67 WB |
350 | if (napi->weight) |
351 | virtqueue_napi_schedule(napi, vq); | |
352 | else | |
353 | /* We were probably waiting for more output buffers. */ | |
354 | netif_wake_subqueue(vi->dev, vq2txq(vq)); | |
296f96fc RR |
355 | } |
356 | ||
28b39bc7 JW |
357 | #define MRG_CTX_HEADER_SHIFT 22 |
358 | static void *mergeable_len_to_ctx(unsigned int truesize, | |
359 | unsigned int headroom) | |
360 | { | |
361 | return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize); | |
362 | } | |
363 | ||
364 | static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx) | |
365 | { | |
366 | return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT; | |
367 | } | |
368 | ||
369 | static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx) | |
370 | { | |
371 | return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1); | |
372 | } | |
373 | ||
3464645a | 374 | /* Called from bottom half context */ |
946fa564 MT |
375 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
376 | struct receive_queue *rq, | |
2613af0e | 377 | struct page *page, unsigned int offset, |
436c9453 | 378 | unsigned int len, unsigned int truesize, |
503d539a | 379 | bool hdr_valid, unsigned int metasize) |
9ab86bbc SM |
380 | { |
381 | struct sk_buff *skb; | |
012873d0 | 382 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
2613af0e | 383 | unsigned int copy, hdr_len, hdr_padded_len; |
9ab86bbc | 384 | char *p; |
fb6813f4 | 385 | |
2613af0e | 386 | p = page_address(page) + offset; |
3f2c31d9 | 387 | |
9ab86bbc | 388 | /* copy small packet so we can reuse these pages for small data */ |
c67f5db8 | 389 | skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); |
9ab86bbc SM |
390 | if (unlikely(!skb)) |
391 | return NULL; | |
3f2c31d9 | 392 | |
9ab86bbc | 393 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 394 | |
012873d0 MT |
395 | hdr_len = vi->hdr_len; |
396 | if (vi->mergeable_rx_bufs) | |
a4a76503 | 397 | hdr_padded_len = sizeof(*hdr); |
012873d0 | 398 | else |
2613af0e | 399 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
3f2c31d9 | 400 | |
503d539a | 401 | /* hdr_valid means no XDP, so we can copy the vnet header */ |
436c9453 JW |
402 | if (hdr_valid) |
403 | memcpy(hdr, p, hdr_len); | |
3f2c31d9 | 404 | |
9ab86bbc | 405 | len -= hdr_len; |
2613af0e MD |
406 | offset += hdr_padded_len; |
407 | p += hdr_padded_len; | |
3f2c31d9 | 408 | |
9ab86bbc SM |
409 | copy = len; |
410 | if (copy > skb_tailroom(skb)) | |
411 | copy = skb_tailroom(skb); | |
59ae1d12 | 412 | skb_put_data(skb, p, copy); |
3f2c31d9 | 413 | |
503d539a YK |
414 | if (metasize) { |
415 | __skb_pull(skb, metasize); | |
416 | skb_metadata_set(skb, metasize); | |
417 | } | |
418 | ||
9ab86bbc SM |
419 | len -= copy; |
420 | offset += copy; | |
3f2c31d9 | 421 | |
2613af0e MD |
422 | if (vi->mergeable_rx_bufs) { |
423 | if (len) | |
424 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); | |
425 | else | |
426 | put_page(page); | |
427 | return skb; | |
428 | } | |
429 | ||
e878d78b SL |
430 | /* |
431 | * Verify that we can indeed put this data into a skb. | |
432 | * This is here to handle cases when the device erroneously | |
433 | * tries to receive more than is possible. This is usually | |
434 | * the case of a broken device. | |
435 | */ | |
436 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 437 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
438 | dev_kfree_skb(skb); |
439 | return NULL; | |
440 | } | |
2613af0e | 441 | BUG_ON(offset >= PAGE_SIZE); |
9ab86bbc | 442 | while (len) { |
2613af0e MD |
443 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
444 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, | |
445 | frag_size, truesize); | |
446 | len -= frag_size; | |
9ab86bbc SM |
447 | page = (struct page *)page->private; |
448 | offset = 0; | |
449 | } | |
3f2c31d9 | 450 | |
9ab86bbc | 451 | if (page) |
e9d7417b | 452 | give_pages(rq, page); |
3f2c31d9 | 453 | |
9ab86bbc SM |
454 | return skb; |
455 | } | |
3f2c31d9 | 456 | |
735fc405 JDB |
457 | static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, |
458 | struct send_queue *sq, | |
459 | struct xdp_frame *xdpf) | |
56434a01 | 460 | { |
56434a01 | 461 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
56434a01 JF |
462 | int err; |
463 | ||
cac320c8 JDB |
464 | if (unlikely(xdpf->headroom < vi->hdr_len)) |
465 | return -EOVERFLOW; | |
466 | ||
467 | /* Make room for virtqueue hdr (also change xdpf->headroom?) */ | |
468 | xdpf->data -= vi->hdr_len; | |
f6b10209 | 469 | /* Zero header and leave csum up to XDP layers */ |
cac320c8 | 470 | hdr = xdpf->data; |
f6b10209 | 471 | memset(hdr, 0, vi->hdr_len); |
cac320c8 | 472 | xdpf->len += vi->hdr_len; |
bb91accf | 473 | |
cac320c8 | 474 | sg_init_one(sq->sg, xdpf->data, xdpf->len); |
bb91accf | 475 | |
5050471d TM |
476 | err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp_to_ptr(xdpf), |
477 | GFP_ATOMIC); | |
11b7d897 | 478 | if (unlikely(err)) |
cac320c8 | 479 | return -ENOSPC; /* Caller handle free/refcnt */ |
56434a01 | 480 | |
cac320c8 | 481 | return 0; |
56434a01 JF |
482 | } |
483 | ||
2a43565c TM |
484 | static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi) |
485 | { | |
486 | unsigned int qp; | |
487 | ||
488 | qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); | |
489 | return &vi->sq[qp]; | |
490 | } | |
491 | ||
735fc405 | 492 | static int virtnet_xdp_xmit(struct net_device *dev, |
42b33468 | 493 | int n, struct xdp_frame **frames, u32 flags) |
186b3c99 JW |
494 | { |
495 | struct virtnet_info *vi = netdev_priv(dev); | |
8dcc5b0a JDB |
496 | struct receive_queue *rq = vi->rq; |
497 | struct bpf_prog *xdp_prog; | |
735fc405 JDB |
498 | struct send_queue *sq; |
499 | unsigned int len; | |
546f2897 TM |
500 | int packets = 0; |
501 | int bytes = 0; | |
735fc405 | 502 | int drops = 0; |
461f03dc | 503 | int kicks = 0; |
5b8f3c8d | 504 | int ret, err; |
5050471d | 505 | void *ptr; |
735fc405 JDB |
506 | int i; |
507 | ||
8dcc5b0a JDB |
508 | /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this |
509 | * indicate XDP resources have been successfully allocated. | |
510 | */ | |
9719c6b9 | 511 | xdp_prog = rcu_access_pointer(rq->xdp_prog); |
1667c08a TM |
512 | if (!xdp_prog) |
513 | return -ENXIO; | |
514 | ||
515 | sq = virtnet_xdp_sq(vi); | |
516 | ||
517 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { | |
518 | ret = -EINVAL; | |
5b8f3c8d TM |
519 | drops = n; |
520 | goto out; | |
521 | } | |
8dcc5b0a | 522 | |
735fc405 | 523 | /* Free up any pending old buffers before queueing new ones. */ |
5050471d | 524 | while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
546f2897 TM |
525 | if (likely(is_xdp_frame(ptr))) { |
526 | struct xdp_frame *frame = ptr_to_xdp(ptr); | |
527 | ||
528 | bytes += frame->len; | |
529 | xdp_return_frame(frame); | |
530 | } else { | |
531 | struct sk_buff *skb = ptr; | |
532 | ||
533 | bytes += skb->len; | |
534 | napi_consume_skb(skb, false); | |
535 | } | |
536 | packets++; | |
5050471d | 537 | } |
735fc405 JDB |
538 | |
539 | for (i = 0; i < n; i++) { | |
540 | struct xdp_frame *xdpf = frames[i]; | |
541 | ||
542 | err = __virtnet_xdp_xmit_one(vi, sq, xdpf); | |
543 | if (err) { | |
544 | xdp_return_frame_rx_napi(xdpf); | |
545 | drops++; | |
546 | } | |
547 | } | |
5b8f3c8d | 548 | ret = n - drops; |
5d274cb4 | 549 | |
461f03dc TM |
550 | if (flags & XDP_XMIT_FLUSH) { |
551 | if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) | |
552 | kicks = 1; | |
553 | } | |
5b8f3c8d TM |
554 | out: |
555 | u64_stats_update_begin(&sq->stats.syncp); | |
546f2897 TM |
556 | sq->stats.bytes += bytes; |
557 | sq->stats.packets += packets; | |
5b8f3c8d TM |
558 | sq->stats.xdp_tx += n; |
559 | sq->stats.xdp_tx_drops += drops; | |
461f03dc | 560 | sq->stats.kicks += kicks; |
5b8f3c8d | 561 | u64_stats_update_end(&sq->stats.syncp); |
5d274cb4 | 562 | |
5b8f3c8d | 563 | return ret; |
186b3c99 JW |
564 | } |
565 | ||
f6b10209 JW |
566 | static unsigned int virtnet_get_headroom(struct virtnet_info *vi) |
567 | { | |
568 | return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0; | |
569 | } | |
570 | ||
4941d472 JW |
571 | /* We copy the packet for XDP in the following cases: |
572 | * | |
573 | * 1) Packet is scattered across multiple rx buffers. | |
574 | * 2) Headroom space is insufficient. | |
575 | * | |
576 | * This is inefficient but it's a temporary condition that | |
577 | * we hit right after XDP is enabled and until queue is refilled | |
578 | * with large buffers with sufficient headroom - so it should affect | |
579 | * at most queue size packets. | |
580 | * Afterwards, the conditions to enable | |
581 | * XDP should preclude the underlying device from sending packets | |
582 | * across multiple buffers (num_buf > 1), and we make sure buffers | |
583 | * have enough headroom. | |
584 | */ | |
585 | static struct page *xdp_linearize_page(struct receive_queue *rq, | |
586 | u16 *num_buf, | |
587 | struct page *p, | |
588 | int offset, | |
589 | int page_off, | |
590 | unsigned int *len) | |
591 | { | |
592 | struct page *page = alloc_page(GFP_ATOMIC); | |
593 | ||
594 | if (!page) | |
595 | return NULL; | |
596 | ||
597 | memcpy(page_address(page) + page_off, page_address(p) + offset, *len); | |
598 | page_off += *len; | |
599 | ||
600 | while (--*num_buf) { | |
3cc81a9a | 601 | int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
4941d472 JW |
602 | unsigned int buflen; |
603 | void *buf; | |
604 | int off; | |
605 | ||
606 | buf = virtqueue_get_buf(rq->vq, &buflen); | |
607 | if (unlikely(!buf)) | |
608 | goto err_buf; | |
609 | ||
610 | p = virt_to_head_page(buf); | |
611 | off = buf - page_address(p); | |
612 | ||
613 | /* guard against a misconfigured or uncooperative backend that | |
614 | * is sending packet larger than the MTU. | |
615 | */ | |
3cc81a9a | 616 | if ((page_off + buflen + tailroom) > PAGE_SIZE) { |
4941d472 JW |
617 | put_page(p); |
618 | goto err_buf; | |
619 | } | |
620 | ||
621 | memcpy(page_address(page) + page_off, | |
622 | page_address(p) + off, buflen); | |
623 | page_off += buflen; | |
624 | put_page(p); | |
625 | } | |
626 | ||
627 | /* Headroom does not contribute to packet length */ | |
628 | *len = page_off - VIRTIO_XDP_HEADROOM; | |
629 | return page; | |
630 | err_buf: | |
631 | __free_pages(page, 0); | |
632 | return NULL; | |
633 | } | |
634 | ||
bb91accf JW |
635 | static struct sk_buff *receive_small(struct net_device *dev, |
636 | struct virtnet_info *vi, | |
637 | struct receive_queue *rq, | |
192f68cf | 638 | void *buf, void *ctx, |
186b3c99 | 639 | unsigned int len, |
7d9d60fd | 640 | unsigned int *xdp_xmit, |
d46eeeaf | 641 | struct virtnet_rq_stats *stats) |
f121159d | 642 | { |
f6b10209 | 643 | struct sk_buff *skb; |
bb91accf | 644 | struct bpf_prog *xdp_prog; |
4941d472 | 645 | unsigned int xdp_headroom = (unsigned long)ctx; |
f6b10209 JW |
646 | unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; |
647 | unsigned int headroom = vi->hdr_len + header_offset; | |
648 | unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + | |
649 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
4941d472 | 650 | struct page *page = virt_to_head_page(buf); |
11b7d897 | 651 | unsigned int delta = 0; |
4941d472 | 652 | struct page *xdp_page; |
11b7d897 | 653 | int err; |
503d539a | 654 | unsigned int metasize = 0; |
11b7d897 | 655 | |
012873d0 | 656 | len -= vi->hdr_len; |
d46eeeaf | 657 | stats->bytes += len; |
f121159d | 658 | |
bb91accf JW |
659 | rcu_read_lock(); |
660 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
661 | if (xdp_prog) { | |
f6b10209 | 662 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; |
44fa2dbd | 663 | struct xdp_frame *xdpf; |
0354e4d1 | 664 | struct xdp_buff xdp; |
f6b10209 | 665 | void *orig_data; |
bb91accf JW |
666 | u32 act; |
667 | ||
95dbe9e7 | 668 | if (unlikely(hdr->hdr.gso_type)) |
bb91accf | 669 | goto err_xdp; |
0354e4d1 | 670 | |
4941d472 JW |
671 | if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { |
672 | int offset = buf - page_address(page) + header_offset; | |
673 | unsigned int tlen = len + vi->hdr_len; | |
674 | u16 num_buf = 1; | |
675 | ||
676 | xdp_headroom = virtnet_get_headroom(vi); | |
677 | header_offset = VIRTNET_RX_PAD + xdp_headroom; | |
678 | headroom = vi->hdr_len + header_offset; | |
679 | buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + | |
680 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
681 | xdp_page = xdp_linearize_page(rq, &num_buf, page, | |
682 | offset, header_offset, | |
683 | &tlen); | |
684 | if (!xdp_page) | |
685 | goto err_xdp; | |
686 | ||
687 | buf = page_address(xdp_page); | |
688 | put_page(page); | |
689 | page = xdp_page; | |
690 | } | |
691 | ||
f6b10209 JW |
692 | xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len; |
693 | xdp.data = xdp.data_hard_start + xdp_headroom; | |
0354e4d1 | 694 | xdp.data_end = xdp.data + len; |
503d539a | 695 | xdp.data_meta = xdp.data; |
754b8a21 | 696 | xdp.rxq = &rq->xdp_rxq; |
9ce6146e | 697 | xdp.frame_sz = buflen; |
f6b10209 | 698 | orig_data = xdp.data; |
0354e4d1 | 699 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
d46eeeaf | 700 | stats->xdp_packets++; |
0354e4d1 | 701 | |
bb91accf JW |
702 | switch (act) { |
703 | case XDP_PASS: | |
2de2f7f4 | 704 | /* Recalculate length in case bpf program changed it */ |
f6b10209 | 705 | delta = orig_data - xdp.data; |
6870de43 | 706 | len = xdp.data_end - xdp.data; |
503d539a | 707 | metasize = xdp.data - xdp.data_meta; |
bb91accf JW |
708 | break; |
709 | case XDP_TX: | |
d46eeeaf | 710 | stats->xdp_tx++; |
1b698fa5 | 711 | xdpf = xdp_convert_buff_to_frame(&xdp); |
44fa2dbd JDB |
712 | if (unlikely(!xdpf)) |
713 | goto err_xdp; | |
ca9e83b4 JW |
714 | err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); |
715 | if (unlikely(err < 0)) { | |
0354e4d1 | 716 | trace_xdp_exception(vi->dev, xdp_prog, act); |
11b7d897 JDB |
717 | goto err_xdp; |
718 | } | |
2471c75e | 719 | *xdp_xmit |= VIRTIO_XDP_TX; |
186b3c99 JW |
720 | rcu_read_unlock(); |
721 | goto xdp_xmit; | |
722 | case XDP_REDIRECT: | |
d46eeeaf | 723 | stats->xdp_redirects++; |
186b3c99 | 724 | err = xdp_do_redirect(dev, &xdp, xdp_prog); |
11b7d897 JDB |
725 | if (err) |
726 | goto err_xdp; | |
2471c75e | 727 | *xdp_xmit |= VIRTIO_XDP_REDIR; |
bb91accf JW |
728 | rcu_read_unlock(); |
729 | goto xdp_xmit; | |
bb91accf | 730 | default: |
0354e4d1 | 731 | bpf_warn_invalid_xdp_action(act); |
df561f66 | 732 | fallthrough; |
0354e4d1 JF |
733 | case XDP_ABORTED: |
734 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
735 | case XDP_DROP: | |
bb91accf JW |
736 | goto err_xdp; |
737 | } | |
738 | } | |
739 | rcu_read_unlock(); | |
740 | ||
f6b10209 JW |
741 | skb = build_skb(buf, buflen); |
742 | if (!skb) { | |
4941d472 | 743 | put_page(page); |
f6b10209 JW |
744 | goto err; |
745 | } | |
746 | skb_reserve(skb, headroom - delta); | |
6870de43 | 747 | skb_put(skb, len); |
f1d4884d | 748 | if (!xdp_prog) { |
f6b10209 JW |
749 | buf += header_offset; |
750 | memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); | |
f1d4884d | 751 | } /* keep zeroed vnet hdr since XDP is loaded */ |
f6b10209 | 752 | |
503d539a YK |
753 | if (metasize) |
754 | skb_metadata_set(skb, metasize); | |
755 | ||
f6b10209 | 756 | err: |
f121159d | 757 | return skb; |
bb91accf JW |
758 | |
759 | err_xdp: | |
760 | rcu_read_unlock(); | |
d46eeeaf JW |
761 | stats->xdp_drops++; |
762 | stats->drops++; | |
4941d472 | 763 | put_page(page); |
bb91accf JW |
764 | xdp_xmit: |
765 | return NULL; | |
f121159d MT |
766 | } |
767 | ||
768 | static struct sk_buff *receive_big(struct net_device *dev, | |
946fa564 | 769 | struct virtnet_info *vi, |
f121159d MT |
770 | struct receive_queue *rq, |
771 | void *buf, | |
7d9d60fd | 772 | unsigned int len, |
d46eeeaf | 773 | struct virtnet_rq_stats *stats) |
f121159d MT |
774 | { |
775 | struct page *page = buf; | |
503d539a YK |
776 | struct sk_buff *skb = |
777 | page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, true, 0); | |
f600b690 | 778 | |
d46eeeaf | 779 | stats->bytes += len - vi->hdr_len; |
f121159d MT |
780 | if (unlikely(!skb)) |
781 | goto err; | |
782 | ||
783 | return skb; | |
784 | ||
785 | err: | |
d46eeeaf | 786 | stats->drops++; |
f121159d MT |
787 | give_pages(rq, page); |
788 | return NULL; | |
789 | } | |
790 | ||
8fc3b9e9 | 791 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
fdd819b2 | 792 | struct virtnet_info *vi, |
8fc3b9e9 | 793 | struct receive_queue *rq, |
680557cf MT |
794 | void *buf, |
795 | void *ctx, | |
186b3c99 | 796 | unsigned int len, |
7d9d60fd | 797 | unsigned int *xdp_xmit, |
d46eeeaf | 798 | struct virtnet_rq_stats *stats) |
9ab86bbc | 799 | { |
012873d0 MT |
800 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; |
801 | u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); | |
8fc3b9e9 MT |
802 | struct page *page = virt_to_head_page(buf); |
803 | int offset = buf - page_address(page); | |
f600b690 JF |
804 | struct sk_buff *head_skb, *curr_skb; |
805 | struct bpf_prog *xdp_prog; | |
9ce6146e | 806 | unsigned int truesize = mergeable_ctx_to_truesize(ctx); |
4941d472 | 807 | unsigned int headroom = mergeable_ctx_to_headroom(ctx); |
503d539a | 808 | unsigned int metasize = 0; |
9ce6146e JDB |
809 | unsigned int frame_sz; |
810 | int err; | |
f600b690 | 811 | |
56434a01 | 812 | head_skb = NULL; |
d46eeeaf | 813 | stats->bytes += len - vi->hdr_len; |
56434a01 | 814 | |
f600b690 JF |
815 | rcu_read_lock(); |
816 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
817 | if (xdp_prog) { | |
44fa2dbd | 818 | struct xdp_frame *xdpf; |
72979a6c | 819 | struct page *xdp_page; |
0354e4d1 | 820 | struct xdp_buff xdp; |
0354e4d1 | 821 | void *data; |
f600b690 JF |
822 | u32 act; |
823 | ||
3d62b2a0 JW |
824 | /* Transient failure which in theory could occur if |
825 | * in-flight packets from before XDP was enabled reach | |
826 | * the receive path after XDP is loaded. | |
827 | */ | |
828 | if (unlikely(hdr->hdr.gso_type)) | |
829 | goto err_xdp; | |
830 | ||
9ce6146e JDB |
831 | /* Buffers with headroom use PAGE_SIZE as alloc size, |
832 | * see add_recvbuf_mergeable() + get_mergeable_buf_len() | |
833 | */ | |
834 | frame_sz = headroom ? PAGE_SIZE : truesize; | |
835 | ||
3cc81a9a JW |
836 | /* This happens when rx buffer size is underestimated |
837 | * or headroom is not enough because of the buffer | |
838 | * was refilled before XDP is set. This should only | |
839 | * happen for the first several packets, so we don't | |
840 | * care much about its performance. | |
841 | */ | |
4941d472 JW |
842 | if (unlikely(num_buf > 1 || |
843 | headroom < virtnet_get_headroom(vi))) { | |
72979a6c | 844 | /* linearize data for XDP */ |
56a86f84 | 845 | xdp_page = xdp_linearize_page(rq, &num_buf, |
4941d472 JW |
846 | page, offset, |
847 | VIRTIO_XDP_HEADROOM, | |
848 | &len); | |
9ce6146e JDB |
849 | frame_sz = PAGE_SIZE; |
850 | ||
72979a6c JF |
851 | if (!xdp_page) |
852 | goto err_xdp; | |
2de2f7f4 | 853 | offset = VIRTIO_XDP_HEADROOM; |
72979a6c JF |
854 | } else { |
855 | xdp_page = page; | |
f600b690 JF |
856 | } |
857 | ||
2de2f7f4 JF |
858 | /* Allow consuming headroom but reserve enough space to push |
859 | * the descriptor on if we get an XDP_TX return code. | |
860 | */ | |
0354e4d1 | 861 | data = page_address(xdp_page) + offset; |
2de2f7f4 | 862 | xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len; |
0354e4d1 JF |
863 | xdp.data = data + vi->hdr_len; |
864 | xdp.data_end = xdp.data + (len - vi->hdr_len); | |
503d539a | 865 | xdp.data_meta = xdp.data; |
754b8a21 | 866 | xdp.rxq = &rq->xdp_rxq; |
9ce6146e | 867 | xdp.frame_sz = frame_sz - vi->hdr_len; |
754b8a21 | 868 | |
0354e4d1 | 869 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
d46eeeaf | 870 | stats->xdp_packets++; |
0354e4d1 | 871 | |
56434a01 JF |
872 | switch (act) { |
873 | case XDP_PASS: | |
503d539a YK |
874 | metasize = xdp.data - xdp.data_meta; |
875 | ||
2de2f7f4 | 876 | /* recalculate offset to account for any header |
503d539a YK |
877 | * adjustments and minus the metasize to copy the |
878 | * metadata in page_to_skb(). Note other cases do not | |
879 | * build an skb and avoid using offset | |
2de2f7f4 | 880 | */ |
503d539a YK |
881 | offset = xdp.data - page_address(xdp_page) - |
882 | vi->hdr_len - metasize; | |
2de2f7f4 | 883 | |
503d539a YK |
884 | /* recalculate len if xdp.data, xdp.data_end or |
885 | * xdp.data_meta were adjusted | |
6870de43 | 886 | */ |
503d539a | 887 | len = xdp.data_end - xdp.data + vi->hdr_len + metasize; |
1830f893 JW |
888 | /* We can only create skb based on xdp_page. */ |
889 | if (unlikely(xdp_page != page)) { | |
890 | rcu_read_unlock(); | |
891 | put_page(page); | |
503d539a YK |
892 | head_skb = page_to_skb(vi, rq, xdp_page, offset, |
893 | len, PAGE_SIZE, false, | |
894 | metasize); | |
1830f893 JW |
895 | return head_skb; |
896 | } | |
56434a01 JF |
897 | break; |
898 | case XDP_TX: | |
d46eeeaf | 899 | stats->xdp_tx++; |
1b698fa5 | 900 | xdpf = xdp_convert_buff_to_frame(&xdp); |
44fa2dbd JDB |
901 | if (unlikely(!xdpf)) |
902 | goto err_xdp; | |
ca9e83b4 JW |
903 | err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); |
904 | if (unlikely(err < 0)) { | |
0354e4d1 | 905 | trace_xdp_exception(vi->dev, xdp_prog, act); |
11b7d897 JDB |
906 | if (unlikely(xdp_page != page)) |
907 | put_page(xdp_page); | |
908 | goto err_xdp; | |
909 | } | |
2471c75e | 910 | *xdp_xmit |= VIRTIO_XDP_TX; |
72979a6c | 911 | if (unlikely(xdp_page != page)) |
5d458a13 | 912 | put_page(page); |
56434a01 JF |
913 | rcu_read_unlock(); |
914 | goto xdp_xmit; | |
3cc81a9a | 915 | case XDP_REDIRECT: |
d46eeeaf | 916 | stats->xdp_redirects++; |
3cc81a9a JW |
917 | err = xdp_do_redirect(dev, &xdp, xdp_prog); |
918 | if (err) { | |
919 | if (unlikely(xdp_page != page)) | |
920 | put_page(xdp_page); | |
921 | goto err_xdp; | |
922 | } | |
2471c75e | 923 | *xdp_xmit |= VIRTIO_XDP_REDIR; |
3cc81a9a | 924 | if (unlikely(xdp_page != page)) |
6890418b | 925 | put_page(page); |
3cc81a9a JW |
926 | rcu_read_unlock(); |
927 | goto xdp_xmit; | |
56434a01 | 928 | default: |
0354e4d1 | 929 | bpf_warn_invalid_xdp_action(act); |
df561f66 | 930 | fallthrough; |
0354e4d1 JF |
931 | case XDP_ABORTED: |
932 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
df561f66 | 933 | fallthrough; |
0354e4d1 | 934 | case XDP_DROP: |
72979a6c JF |
935 | if (unlikely(xdp_page != page)) |
936 | __free_pages(xdp_page, 0); | |
f600b690 | 937 | goto err_xdp; |
56434a01 | 938 | } |
f600b690 JF |
939 | } |
940 | rcu_read_unlock(); | |
ab7db917 | 941 | |
28b39bc7 | 942 | if (unlikely(len > truesize)) { |
56da5fd0 | 943 | pr_debug("%s: rx error: len %u exceeds truesize %lu\n", |
680557cf MT |
944 | dev->name, len, (unsigned long)ctx); |
945 | dev->stats.rx_length_errors++; | |
946 | goto err_skb; | |
947 | } | |
28b39bc7 | 948 | |
503d539a YK |
949 | head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog, |
950 | metasize); | |
f600b690 | 951 | curr_skb = head_skb; |
9ab86bbc | 952 | |
8fc3b9e9 MT |
953 | if (unlikely(!curr_skb)) |
954 | goto err_skb; | |
9ab86bbc | 955 | while (--num_buf) { |
8fc3b9e9 MT |
956 | int num_skb_frags; |
957 | ||
680557cf | 958 | buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); |
03e9f8a0 | 959 | if (unlikely(!buf)) { |
8fc3b9e9 | 960 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
fdd819b2 | 961 | dev->name, num_buf, |
012873d0 MT |
962 | virtio16_to_cpu(vi->vdev, |
963 | hdr->num_buffers)); | |
8fc3b9e9 MT |
964 | dev->stats.rx_length_errors++; |
965 | goto err_buf; | |
3f2c31d9 | 966 | } |
8fc3b9e9 | 967 | |
d46eeeaf | 968 | stats->bytes += len; |
8fc3b9e9 | 969 | page = virt_to_head_page(buf); |
28b39bc7 JW |
970 | |
971 | truesize = mergeable_ctx_to_truesize(ctx); | |
972 | if (unlikely(len > truesize)) { | |
56da5fd0 | 973 | pr_debug("%s: rx error: len %u exceeds truesize %lu\n", |
680557cf MT |
974 | dev->name, len, (unsigned long)ctx); |
975 | dev->stats.rx_length_errors++; | |
976 | goto err_skb; | |
977 | } | |
8fc3b9e9 MT |
978 | |
979 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; | |
2613af0e MD |
980 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
981 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
8fc3b9e9 MT |
982 | |
983 | if (unlikely(!nskb)) | |
984 | goto err_skb; | |
2613af0e MD |
985 | if (curr_skb == head_skb) |
986 | skb_shinfo(curr_skb)->frag_list = nskb; | |
987 | else | |
988 | curr_skb->next = nskb; | |
989 | curr_skb = nskb; | |
990 | head_skb->truesize += nskb->truesize; | |
991 | num_skb_frags = 0; | |
992 | } | |
993 | if (curr_skb != head_skb) { | |
994 | head_skb->data_len += len; | |
995 | head_skb->len += len; | |
fb51879d | 996 | head_skb->truesize += truesize; |
2613af0e | 997 | } |
8fc3b9e9 | 998 | offset = buf - page_address(page); |
ba275241 JW |
999 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
1000 | put_page(page); | |
1001 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
fb51879d | 1002 | len, truesize); |
ba275241 JW |
1003 | } else { |
1004 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
fb51879d | 1005 | offset, len, truesize); |
ba275241 | 1006 | } |
8fc3b9e9 MT |
1007 | } |
1008 | ||
5377d758 | 1009 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); |
8fc3b9e9 MT |
1010 | return head_skb; |
1011 | ||
f600b690 JF |
1012 | err_xdp: |
1013 | rcu_read_unlock(); | |
d46eeeaf | 1014 | stats->xdp_drops++; |
8fc3b9e9 MT |
1015 | err_skb: |
1016 | put_page(page); | |
850e088d | 1017 | while (num_buf-- > 1) { |
680557cf MT |
1018 | buf = virtqueue_get_buf(rq->vq, &len); |
1019 | if (unlikely(!buf)) { | |
8fc3b9e9 MT |
1020 | pr_debug("%s: rx error: %d buffers missing\n", |
1021 | dev->name, num_buf); | |
1022 | dev->stats.rx_length_errors++; | |
1023 | break; | |
1024 | } | |
d46eeeaf | 1025 | stats->bytes += len; |
680557cf | 1026 | page = virt_to_head_page(buf); |
8fc3b9e9 | 1027 | put_page(page); |
9ab86bbc | 1028 | } |
8fc3b9e9 | 1029 | err_buf: |
d46eeeaf | 1030 | stats->drops++; |
8fc3b9e9 | 1031 | dev_kfree_skb(head_skb); |
56434a01 | 1032 | xdp_xmit: |
8fc3b9e9 | 1033 | return NULL; |
9ab86bbc SM |
1034 | } |
1035 | ||
7d9d60fd TM |
1036 | static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
1037 | void *buf, unsigned int len, void **ctx, | |
a0929a44 | 1038 | unsigned int *xdp_xmit, |
d46eeeaf | 1039 | struct virtnet_rq_stats *stats) |
9ab86bbc | 1040 | { |
e9d7417b | 1041 | struct net_device *dev = vi->dev; |
9ab86bbc | 1042 | struct sk_buff *skb; |
012873d0 | 1043 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
3f2c31d9 | 1044 | |
bcff3162 | 1045 | if (unlikely(len < vi->hdr_len + ETH_HLEN)) { |
9ab86bbc SM |
1046 | pr_debug("%s: short packet %i\n", dev->name, len); |
1047 | dev->stats.rx_length_errors++; | |
ab7db917 | 1048 | if (vi->mergeable_rx_bufs) { |
680557cf | 1049 | put_page(virt_to_head_page(buf)); |
ab7db917 | 1050 | } else if (vi->big_packets) { |
98bfd23c | 1051 | give_pages(rq, buf); |
ab7db917 | 1052 | } else { |
f6b10209 | 1053 | put_page(virt_to_head_page(buf)); |
ab7db917 | 1054 | } |
7d9d60fd | 1055 | return; |
9ab86bbc | 1056 | } |
3f2c31d9 | 1057 | |
f121159d | 1058 | if (vi->mergeable_rx_bufs) |
7d9d60fd | 1059 | skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, |
a0929a44 | 1060 | stats); |
f121159d | 1061 | else if (vi->big_packets) |
a0929a44 | 1062 | skb = receive_big(dev, vi, rq, buf, len, stats); |
f121159d | 1063 | else |
a0929a44 | 1064 | skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); |
f121159d MT |
1065 | |
1066 | if (unlikely(!skb)) | |
7d9d60fd | 1067 | return; |
3f2c31d9 | 1068 | |
9ab86bbc | 1069 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 1070 | |
e858fae2 | 1071 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) |
10a8d94a | 1072 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
296f96fc | 1073 | |
e858fae2 MR |
1074 | if (virtio_net_hdr_to_skb(skb, &hdr->hdr, |
1075 | virtio_is_little_endian(vi->vdev))) { | |
1076 | net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", | |
1077 | dev->name, hdr->hdr.gso_type, | |
1078 | hdr->hdr.gso_size); | |
1079 | goto frame_err; | |
296f96fc RR |
1080 | } |
1081 | ||
133bbb18 | 1082 | skb_record_rx_queue(skb, vq2rxq(rq->vq)); |
d1dc06dc MR |
1083 | skb->protocol = eth_type_trans(skb, dev); |
1084 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
1085 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
1086 | ||
0fbd050a | 1087 | napi_gro_receive(&rq->napi, skb); |
7d9d60fd | 1088 | return; |
296f96fc RR |
1089 | |
1090 | frame_err: | |
1091 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
1092 | dev_kfree_skb(skb); |
1093 | } | |
1094 | ||
192f68cf JW |
1095 | /* Unlike mergeable buffers, all buffers are allocated to the |
1096 | * same size, except for the headroom. For this reason we do | |
1097 | * not need to use mergeable_len_to_ctx here - it is enough | |
1098 | * to store the headroom as the context ignoring the truesize. | |
1099 | */ | |
946fa564 MT |
1100 | static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
1101 | gfp_t gfp) | |
296f96fc | 1102 | { |
f6b10209 JW |
1103 | struct page_frag *alloc_frag = &rq->alloc_frag; |
1104 | char *buf; | |
2de2f7f4 | 1105 | unsigned int xdp_headroom = virtnet_get_headroom(vi); |
192f68cf | 1106 | void *ctx = (void *)(unsigned long)xdp_headroom; |
f6b10209 | 1107 | int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; |
9ab86bbc | 1108 | int err; |
3f2c31d9 | 1109 | |
f6b10209 JW |
1110 | len = SKB_DATA_ALIGN(len) + |
1111 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
1112 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) | |
9ab86bbc | 1113 | return -ENOMEM; |
296f96fc | 1114 | |
f6b10209 JW |
1115 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
1116 | get_page(alloc_frag->page); | |
1117 | alloc_frag->offset += len; | |
1118 | sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, | |
1119 | vi->hdr_len + GOOD_PACKET_LEN); | |
192f68cf | 1120 | err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); |
9ab86bbc | 1121 | if (err < 0) |
f6b10209 | 1122 | put_page(virt_to_head_page(buf)); |
9ab86bbc SM |
1123 | return err; |
1124 | } | |
97402b96 | 1125 | |
012873d0 MT |
1126 | static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, |
1127 | gfp_t gfp) | |
9ab86bbc | 1128 | { |
9ab86bbc SM |
1129 | struct page *first, *list = NULL; |
1130 | char *p; | |
1131 | int i, err, offset; | |
1132 | ||
a5835440 RR |
1133 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
1134 | ||
e9d7417b | 1135 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 1136 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 1137 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
1138 | if (!first) { |
1139 | if (list) | |
e9d7417b | 1140 | give_pages(rq, list); |
9ab86bbc | 1141 | return -ENOMEM; |
97402b96 | 1142 | } |
e9d7417b | 1143 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 1144 | |
9ab86bbc SM |
1145 | /* chain new page in list head to match sg */ |
1146 | first->private = (unsigned long)list; | |
1147 | list = first; | |
1148 | } | |
296f96fc | 1149 | |
e9d7417b | 1150 | first = get_a_page(rq, gfp); |
9ab86bbc | 1151 | if (!first) { |
e9d7417b | 1152 | give_pages(rq, list); |
9ab86bbc SM |
1153 | return -ENOMEM; |
1154 | } | |
1155 | p = page_address(first); | |
1156 | ||
e9d7417b | 1157 | /* rq->sg[0], rq->sg[1] share the same page */ |
012873d0 MT |
1158 | /* a separated rq->sg[0] for header - required in case !any_header_sg */ |
1159 | sg_set_buf(&rq->sg[0], p, vi->hdr_len); | |
9ab86bbc | 1160 | |
e9d7417b | 1161 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 1162 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 1163 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
1164 | |
1165 | /* chain first in list head */ | |
1166 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
1167 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
1168 | first, gfp); | |
9ab86bbc | 1169 | if (err < 0) |
e9d7417b | 1170 | give_pages(rq, first); |
9ab86bbc SM |
1171 | |
1172 | return err; | |
296f96fc RR |
1173 | } |
1174 | ||
d85b758f | 1175 | static unsigned int get_mergeable_buf_len(struct receive_queue *rq, |
3cc81a9a JW |
1176 | struct ewma_pkt_len *avg_pkt_len, |
1177 | unsigned int room) | |
3f2c31d9 | 1178 | { |
ab7db917 | 1179 | const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
fbf28d78 MD |
1180 | unsigned int len; |
1181 | ||
3cc81a9a JW |
1182 | if (room) |
1183 | return PAGE_SIZE - room; | |
1184 | ||
1185 | len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), | |
f0c3192c | 1186 | rq->min_buf_len, PAGE_SIZE - hdr_len); |
3cc81a9a | 1187 | |
e377fcc8 | 1188 | return ALIGN(len, L1_CACHE_BYTES); |
fbf28d78 MD |
1189 | } |
1190 | ||
2de2f7f4 JF |
1191 | static int add_recvbuf_mergeable(struct virtnet_info *vi, |
1192 | struct receive_queue *rq, gfp_t gfp) | |
fbf28d78 | 1193 | { |
fb51879d | 1194 | struct page_frag *alloc_frag = &rq->alloc_frag; |
2de2f7f4 | 1195 | unsigned int headroom = virtnet_get_headroom(vi); |
3cc81a9a JW |
1196 | unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; |
1197 | unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); | |
fb51879d | 1198 | char *buf; |
680557cf | 1199 | void *ctx; |
3f2c31d9 | 1200 | int err; |
fb51879d | 1201 | unsigned int len, hole; |
3f2c31d9 | 1202 | |
3cc81a9a JW |
1203 | /* Extra tailroom is needed to satisfy XDP's assumption. This |
1204 | * means rx frags coalescing won't work, but consider we've | |
1205 | * disabled GSO for XDP, it won't be a big issue. | |
1206 | */ | |
1207 | len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); | |
1208 | if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) | |
9ab86bbc | 1209 | return -ENOMEM; |
ab7db917 | 1210 | |
fb51879d | 1211 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
2de2f7f4 | 1212 | buf += headroom; /* advance address leaving hole at front of pkt */ |
fb51879d | 1213 | get_page(alloc_frag->page); |
3cc81a9a | 1214 | alloc_frag->offset += len + room; |
fb51879d | 1215 | hole = alloc_frag->size - alloc_frag->offset; |
3cc81a9a | 1216 | if (hole < len + room) { |
ab7db917 MD |
1217 | /* To avoid internal fragmentation, if there is very likely not |
1218 | * enough space for another buffer, add the remaining space to | |
1daa8790 | 1219 | * the current buffer. |
ab7db917 | 1220 | */ |
fb51879d MD |
1221 | len += hole; |
1222 | alloc_frag->offset += hole; | |
1223 | } | |
3f2c31d9 | 1224 | |
fb51879d | 1225 | sg_init_one(rq->sg, buf, len); |
29fda25a | 1226 | ctx = mergeable_len_to_ctx(len, headroom); |
680557cf | 1227 | err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); |
9ab86bbc | 1228 | if (err < 0) |
2613af0e | 1229 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 1230 | |
9ab86bbc SM |
1231 | return err; |
1232 | } | |
3f2c31d9 | 1233 | |
b2baed69 RR |
1234 | /* |
1235 | * Returns false if we couldn't fill entirely (OOM). | |
1236 | * | |
1237 | * Normally run in the receive path, but can also be run from ndo_open | |
1238 | * before we're receiving packets, or from refill_work which is | |
1239 | * careful to disable receiving (using napi_disable). | |
1240 | */ | |
946fa564 MT |
1241 | static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, |
1242 | gfp_t gfp) | |
9ab86bbc SM |
1243 | { |
1244 | int err; | |
1788f495 | 1245 | bool oom; |
3f2c31d9 | 1246 | |
9ab86bbc SM |
1247 | do { |
1248 | if (vi->mergeable_rx_bufs) | |
2de2f7f4 | 1249 | err = add_recvbuf_mergeable(vi, rq, gfp); |
9ab86bbc | 1250 | else if (vi->big_packets) |
012873d0 | 1251 | err = add_recvbuf_big(vi, rq, gfp); |
9ab86bbc | 1252 | else |
946fa564 | 1253 | err = add_recvbuf_small(vi, rq, gfp); |
3f2c31d9 | 1254 | |
1788f495 | 1255 | oom = err == -ENOMEM; |
9ed4cb07 | 1256 | if (err) |
3f2c31d9 | 1257 | break; |
b7dfde95 | 1258 | } while (rq->vq->num_free); |
461f03dc | 1259 | if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { |
01c32598 MT |
1260 | unsigned long flags; |
1261 | ||
1262 | flags = u64_stats_update_begin_irqsave(&rq->stats.syncp); | |
d46eeeaf | 1263 | rq->stats.kicks++; |
01c32598 | 1264 | u64_stats_update_end_irqrestore(&rq->stats.syncp, flags); |
461f03dc TM |
1265 | } |
1266 | ||
3161e453 | 1267 | return !oom; |
3f2c31d9 MM |
1268 | } |
1269 | ||
18445c4d | 1270 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
1271 | { |
1272 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 1273 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 1274 | |
e4e8452a | 1275 | virtqueue_napi_schedule(&rq->napi, rvq); |
296f96fc RR |
1276 | } |
1277 | ||
e4e8452a | 1278 | static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) |
3e9d08ec | 1279 | { |
e4e8452a | 1280 | napi_enable(napi); |
3e9d08ec BR |
1281 | |
1282 | /* If all buffers were filled by other side before we napi_enabled, we | |
e4e8452a WB |
1283 | * won't get another interrupt, so process any outstanding packets now. |
1284 | * Call local_bh_enable after to trigger softIRQ processing. | |
1285 | */ | |
1286 | local_bh_disable(); | |
1287 | virtqueue_napi_schedule(napi, vq); | |
1288 | local_bh_enable(); | |
3e9d08ec BR |
1289 | } |
1290 | ||
b92f1e67 WB |
1291 | static void virtnet_napi_tx_enable(struct virtnet_info *vi, |
1292 | struct virtqueue *vq, | |
1293 | struct napi_struct *napi) | |
1294 | { | |
1295 | if (!napi->weight) | |
1296 | return; | |
1297 | ||
1298 | /* Tx napi touches cachelines on the cpu handling tx interrupts. Only | |
1299 | * enable the feature if this is likely affine with the transmit path. | |
1300 | */ | |
1301 | if (!vi->affinity_hint_set) { | |
1302 | napi->weight = 0; | |
1303 | return; | |
1304 | } | |
1305 | ||
1306 | return virtnet_napi_enable(vq, napi); | |
1307 | } | |
1308 | ||
78a57b48 WB |
1309 | static void virtnet_napi_tx_disable(struct napi_struct *napi) |
1310 | { | |
1311 | if (napi->weight) | |
1312 | napi_disable(napi); | |
1313 | } | |
1314 | ||
3161e453 RR |
1315 | static void refill_work(struct work_struct *work) |
1316 | { | |
e9d7417b JW |
1317 | struct virtnet_info *vi = |
1318 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 1319 | bool still_empty; |
986a4f4d JW |
1320 | int i; |
1321 | ||
55257d72 | 1322 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 1323 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 1324 | |
986a4f4d | 1325 | napi_disable(&rq->napi); |
946fa564 | 1326 | still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); |
e4e8452a | 1327 | virtnet_napi_enable(rq->vq, &rq->napi); |
3161e453 | 1328 | |
986a4f4d JW |
1329 | /* In theory, this can happen: if we don't get any buffers in |
1330 | * we will *never* try to fill again. | |
1331 | */ | |
1332 | if (still_empty) | |
1333 | schedule_delayed_work(&vi->refill, HZ/2); | |
1334 | } | |
3161e453 RR |
1335 | } |
1336 | ||
2471c75e JDB |
1337 | static int virtnet_receive(struct receive_queue *rq, int budget, |
1338 | unsigned int *xdp_xmit) | |
296f96fc | 1339 | { |
e9d7417b | 1340 | struct virtnet_info *vi = rq->vq->vdev->priv; |
d46eeeaf | 1341 | struct virtnet_rq_stats stats = {}; |
a0929a44 | 1342 | unsigned int len; |
9ab86bbc | 1343 | void *buf; |
a0929a44 | 1344 | int i; |
296f96fc | 1345 | |
192f68cf | 1346 | if (!vi->big_packets || vi->mergeable_rx_bufs) { |
680557cf MT |
1347 | void *ctx; |
1348 | ||
d46eeeaf | 1349 | while (stats.packets < budget && |
680557cf | 1350 | (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { |
a0929a44 | 1351 | receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); |
d46eeeaf | 1352 | stats.packets++; |
680557cf MT |
1353 | } |
1354 | } else { | |
d46eeeaf | 1355 | while (stats.packets < budget && |
680557cf | 1356 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
a0929a44 | 1357 | receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); |
d46eeeaf | 1358 | stats.packets++; |
680557cf | 1359 | } |
296f96fc RR |
1360 | } |
1361 | ||
718be6ba | 1362 | if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { |
946fa564 | 1363 | if (!try_fill_recv(vi, rq, GFP_ATOMIC)) |
3b07e9ca | 1364 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 1365 | } |
296f96fc | 1366 | |
d7dfc5cf | 1367 | u64_stats_update_begin(&rq->stats.syncp); |
a0929a44 TM |
1368 | for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { |
1369 | size_t offset = virtnet_rq_stats_desc[i].offset; | |
1370 | u64 *item; | |
1371 | ||
d46eeeaf JW |
1372 | item = (u64 *)((u8 *)&rq->stats + offset); |
1373 | *item += *(u64 *)((u8 *)&stats + offset); | |
a0929a44 | 1374 | } |
d7dfc5cf | 1375 | u64_stats_update_end(&rq->stats.syncp); |
61845d20 | 1376 | |
d46eeeaf | 1377 | return stats.packets; |
2ffa7598 JW |
1378 | } |
1379 | ||
df133f3f | 1380 | static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi) |
ea7735d9 | 1381 | { |
ea7735d9 | 1382 | unsigned int len; |
ea7735d9 WB |
1383 | unsigned int packets = 0; |
1384 | unsigned int bytes = 0; | |
5050471d | 1385 | void *ptr; |
ea7735d9 | 1386 | |
5050471d TM |
1387 | while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
1388 | if (likely(!is_xdp_frame(ptr))) { | |
1389 | struct sk_buff *skb = ptr; | |
ea7735d9 | 1390 | |
5050471d | 1391 | pr_debug("Sent skb %p\n", skb); |
ea7735d9 | 1392 | |
5050471d TM |
1393 | bytes += skb->len; |
1394 | napi_consume_skb(skb, in_napi); | |
1395 | } else { | |
1396 | struct xdp_frame *frame = ptr_to_xdp(ptr); | |
ea7735d9 | 1397 | |
5050471d TM |
1398 | bytes += frame->len; |
1399 | xdp_return_frame(frame); | |
1400 | } | |
1401 | packets++; | |
ea7735d9 WB |
1402 | } |
1403 | ||
1404 | /* Avoid overhead when no packets have been processed | |
1405 | * happens when called speculatively from start_xmit. | |
1406 | */ | |
1407 | if (!packets) | |
1408 | return; | |
1409 | ||
d7dfc5cf TM |
1410 | u64_stats_update_begin(&sq->stats.syncp); |
1411 | sq->stats.bytes += bytes; | |
1412 | sq->stats.packets += packets; | |
1413 | u64_stats_update_end(&sq->stats.syncp); | |
ea7735d9 WB |
1414 | } |
1415 | ||
534da5e8 TM |
1416 | static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) |
1417 | { | |
1418 | if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) | |
1419 | return false; | |
1420 | else if (q < vi->curr_queue_pairs) | |
1421 | return true; | |
1422 | else | |
1423 | return false; | |
1424 | } | |
1425 | ||
7b0411ef WB |
1426 | static void virtnet_poll_cleantx(struct receive_queue *rq) |
1427 | { | |
1428 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
1429 | unsigned int index = vq2rxq(rq->vq); | |
1430 | struct send_queue *sq = &vi->sq[index]; | |
1431 | struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); | |
1432 | ||
534da5e8 | 1433 | if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index)) |
7b0411ef WB |
1434 | return; |
1435 | ||
1436 | if (__netif_tx_trylock(txq)) { | |
df133f3f | 1437 | free_old_xmit_skbs(sq, true); |
7b0411ef WB |
1438 | __netif_tx_unlock(txq); |
1439 | } | |
1440 | ||
1441 | if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) | |
1442 | netif_tx_wake_queue(txq); | |
1443 | } | |
1444 | ||
2ffa7598 JW |
1445 | static int virtnet_poll(struct napi_struct *napi, int budget) |
1446 | { | |
1447 | struct receive_queue *rq = | |
1448 | container_of(napi, struct receive_queue, napi); | |
9267c430 JW |
1449 | struct virtnet_info *vi = rq->vq->vdev->priv; |
1450 | struct send_queue *sq; | |
2a43565c | 1451 | unsigned int received; |
2471c75e | 1452 | unsigned int xdp_xmit = 0; |
2ffa7598 | 1453 | |
7b0411ef WB |
1454 | virtnet_poll_cleantx(rq); |
1455 | ||
186b3c99 | 1456 | received = virtnet_receive(rq, budget, &xdp_xmit); |
2ffa7598 | 1457 | |
8329d98e | 1458 | /* Out of packets? */ |
e4e8452a WB |
1459 | if (received < budget) |
1460 | virtqueue_napi_complete(napi, rq->vq, received); | |
296f96fc | 1461 | |
2471c75e | 1462 | if (xdp_xmit & VIRTIO_XDP_REDIR) |
1d233886 | 1463 | xdp_do_flush(); |
2471c75e JDB |
1464 | |
1465 | if (xdp_xmit & VIRTIO_XDP_TX) { | |
2a43565c | 1466 | sq = virtnet_xdp_sq(vi); |
461f03dc TM |
1467 | if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { |
1468 | u64_stats_update_begin(&sq->stats.syncp); | |
1469 | sq->stats.kicks++; | |
1470 | u64_stats_update_end(&sq->stats.syncp); | |
1471 | } | |
9267c430 | 1472 | } |
186b3c99 | 1473 | |
296f96fc RR |
1474 | return received; |
1475 | } | |
1476 | ||
986a4f4d JW |
1477 | static int virtnet_open(struct net_device *dev) |
1478 | { | |
1479 | struct virtnet_info *vi = netdev_priv(dev); | |
754b8a21 | 1480 | int i, err; |
986a4f4d | 1481 | |
e4166625 JW |
1482 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1483 | if (i < vi->curr_queue_pairs) | |
1484 | /* Make sure we have some buffers: if oom use wq. */ | |
946fa564 | 1485 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
e4166625 | 1486 | schedule_delayed_work(&vi->refill, 0); |
754b8a21 | 1487 | |
b02e5a0e | 1488 | err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id); |
754b8a21 JDB |
1489 | if (err < 0) |
1490 | return err; | |
1491 | ||
8d5d8852 JDB |
1492 | err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq, |
1493 | MEM_TYPE_PAGE_SHARED, NULL); | |
1494 | if (err < 0) { | |
1495 | xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); | |
1496 | return err; | |
1497 | } | |
1498 | ||
e4e8452a | 1499 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
b92f1e67 | 1500 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); |
986a4f4d JW |
1501 | } |
1502 | ||
1503 | return 0; | |
1504 | } | |
1505 | ||
b92f1e67 WB |
1506 | static int virtnet_poll_tx(struct napi_struct *napi, int budget) |
1507 | { | |
1508 | struct send_queue *sq = container_of(napi, struct send_queue, napi); | |
1509 | struct virtnet_info *vi = sq->vq->vdev->priv; | |
534da5e8 TM |
1510 | unsigned int index = vq2txq(sq->vq); |
1511 | struct netdev_queue *txq; | |
b92f1e67 | 1512 | |
534da5e8 TM |
1513 | if (unlikely(is_xdp_raw_buffer_queue(vi, index))) { |
1514 | /* We don't need to enable cb for XDP */ | |
1515 | napi_complete_done(napi, 0); | |
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | txq = netdev_get_tx_queue(vi->dev, index); | |
b92f1e67 | 1520 | __netif_tx_lock(txq, raw_smp_processor_id()); |
df133f3f | 1521 | free_old_xmit_skbs(sq, true); |
b92f1e67 WB |
1522 | __netif_tx_unlock(txq); |
1523 | ||
1524 | virtqueue_napi_complete(napi, sq->vq, 0); | |
1525 | ||
1526 | if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) | |
1527 | netif_tx_wake_queue(txq); | |
1528 | ||
1529 | return 0; | |
1530 | } | |
1531 | ||
e9d7417b | 1532 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 1533 | { |
012873d0 | 1534 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
296f96fc | 1535 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 1536 | struct virtnet_info *vi = sq->vq->vdev->priv; |
e2fcad58 | 1537 | int num_sg; |
012873d0 | 1538 | unsigned hdr_len = vi->hdr_len; |
e7428e95 | 1539 | bool can_push; |
296f96fc | 1540 | |
e174961c | 1541 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
1542 | |
1543 | can_push = vi->any_header_sg && | |
1544 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
1545 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
1546 | /* Even if we can, don't push here yet as this would skew | |
1547 | * csum_start offset below. */ | |
1548 | if (can_push) | |
012873d0 | 1549 | hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); |
e7428e95 MT |
1550 | else |
1551 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 1552 | |
e858fae2 | 1553 | if (virtio_net_hdr_from_skb(skb, &hdr->hdr, |
fd3a8862 WB |
1554 | virtio_is_little_endian(vi->vdev), false, |
1555 | 0)) | |
e858fae2 | 1556 | BUG(); |
296f96fc | 1557 | |
3f2c31d9 | 1558 | if (vi->mergeable_rx_bufs) |
012873d0 | 1559 | hdr->num_buffers = 0; |
3f2c31d9 | 1560 | |
547c890c | 1561 | sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); |
e7428e95 MT |
1562 | if (can_push) { |
1563 | __skb_push(skb, hdr_len); | |
1564 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
e2fcad58 JD |
1565 | if (unlikely(num_sg < 0)) |
1566 | return num_sg; | |
e7428e95 MT |
1567 | /* Pull header back to avoid skew in tx bytes calculations. */ |
1568 | __skb_pull(skb, hdr_len); | |
1569 | } else { | |
1570 | sg_set_buf(sq->sg, hdr, hdr_len); | |
e2fcad58 JD |
1571 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); |
1572 | if (unlikely(num_sg < 0)) | |
1573 | return num_sg; | |
1574 | num_sg++; | |
e7428e95 | 1575 | } |
9dc7b9e4 | 1576 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
1577 | } |
1578 | ||
424efe9c | 1579 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
1580 | { |
1581 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
1582 | int qnum = skb_get_queue_mapping(skb); |
1583 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 1584 | int err; |
4b7fd2e6 | 1585 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
6b16f9ee | 1586 | bool kick = !netdev_xmit_more(); |
b92f1e67 | 1587 | bool use_napi = sq->napi.weight; |
2cb9c6ba | 1588 | |
2cb9c6ba | 1589 | /* Free up any pending old buffers before queueing new ones. */ |
df133f3f | 1590 | free_old_xmit_skbs(sq, false); |
99ffc696 | 1591 | |
bdb12e0d WB |
1592 | if (use_napi && kick) |
1593 | virtqueue_enable_cb_delayed(sq->vq); | |
1594 | ||
074c3582 JK |
1595 | /* timestamp packet in software */ |
1596 | skb_tx_timestamp(skb); | |
1597 | ||
03f191ba | 1598 | /* Try to transmit */ |
b7dfde95 | 1599 | err = xmit_skb(sq, skb); |
48925e37 | 1600 | |
9ed4cb07 | 1601 | /* This should not happen! */ |
681daee2 | 1602 | if (unlikely(err)) { |
9ed4cb07 RR |
1603 | dev->stats.tx_fifo_errors++; |
1604 | if (net_ratelimit()) | |
1605 | dev_warn(&dev->dev, | |
7934b481 YS |
1606 | "Unexpected TXQ (%d) queue failure: %d\n", |
1607 | qnum, err); | |
58eba97d | 1608 | dev->stats.tx_dropped++; |
85e94525 | 1609 | dev_kfree_skb_any(skb); |
58eba97d | 1610 | return NETDEV_TX_OK; |
296f96fc | 1611 | } |
03f191ba | 1612 | |
48925e37 | 1613 | /* Don't wait up for transmitted skbs to be freed. */ |
b92f1e67 WB |
1614 | if (!use_napi) { |
1615 | skb_orphan(skb); | |
895b5c9f | 1616 | nf_reset_ct(skb); |
b92f1e67 | 1617 | } |
48925e37 | 1618 | |
60302ff6 MT |
1619 | /* If running out of space, stop queue to avoid getting packets that we |
1620 | * are then unable to transmit. | |
1621 | * An alternative would be to force queuing layer to requeue the skb by | |
1622 | * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be | |
1623 | * returned in a normal path of operation: it means that driver is not | |
1624 | * maintaining the TX queue stop/start state properly, and causes | |
1625 | * the stack to do a non-trivial amount of useless work. | |
1626 | * Since most packets only take 1 or 2 ring slots, stopping the queue | |
1627 | * early means 16 slots are typically wasted. | |
d631b94e | 1628 | */ |
b7dfde95 | 1629 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 1630 | netif_stop_subqueue(dev, qnum); |
b92f1e67 WB |
1631 | if (!use_napi && |
1632 | unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { | |
48925e37 | 1633 | /* More just got used, free them then recheck. */ |
df133f3f | 1634 | free_old_xmit_skbs(sq, false); |
b7dfde95 | 1635 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { |
986a4f4d | 1636 | netif_start_subqueue(dev, qnum); |
e9d7417b | 1637 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
1638 | } |
1639 | } | |
99ffc696 | 1640 | } |
48925e37 | 1641 | |
461f03dc TM |
1642 | if (kick || netif_xmit_stopped(txq)) { |
1643 | if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { | |
1644 | u64_stats_update_begin(&sq->stats.syncp); | |
1645 | sq->stats.kicks++; | |
1646 | u64_stats_update_end(&sq->stats.syncp); | |
1647 | } | |
1648 | } | |
296f96fc | 1649 | |
0b725a2c | 1650 | return NETDEV_TX_OK; |
c223a078 DM |
1651 | } |
1652 | ||
40cbfc37 AK |
1653 | /* |
1654 | * Send command via the control virtqueue and check status. Commands | |
1655 | * supported by the hypervisor, as indicated by feature bits, should | |
788a8b6d | 1656 | * never fail unless improperly formatted. |
40cbfc37 AK |
1657 | */ |
1658 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
d24bae32 | 1659 | struct scatterlist *out) |
40cbfc37 | 1660 | { |
f7bc9594 | 1661 | struct scatterlist *sgs[4], hdr, stat; |
d24bae32 | 1662 | unsigned out_num = 0, tmp; |
40cbfc37 AK |
1663 | |
1664 | /* Caller should know better */ | |
f7bc9594 | 1665 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 | 1666 | |
12e57169 MT |
1667 | vi->ctrl->status = ~0; |
1668 | vi->ctrl->hdr.class = class; | |
1669 | vi->ctrl->hdr.cmd = cmd; | |
f7bc9594 | 1670 | /* Add header */ |
12e57169 | 1671 | sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); |
f7bc9594 | 1672 | sgs[out_num++] = &hdr; |
40cbfc37 | 1673 | |
f7bc9594 RR |
1674 | if (out) |
1675 | sgs[out_num++] = out; | |
40cbfc37 | 1676 | |
f7bc9594 | 1677 | /* Add return status. */ |
12e57169 | 1678 | sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); |
d24bae32 | 1679 | sgs[out_num] = &stat; |
40cbfc37 | 1680 | |
d24bae32 | 1681 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
a7c58146 | 1682 | virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
40cbfc37 | 1683 | |
67975901 | 1684 | if (unlikely(!virtqueue_kick(vi->cvq))) |
12e57169 | 1685 | return vi->ctrl->status == VIRTIO_NET_OK; |
40cbfc37 AK |
1686 | |
1687 | /* Spin for a response, the kick causes an ioport write, trapping | |
1688 | * into the hypervisor, so the request should be handled immediately. | |
1689 | */ | |
047b9b94 HG |
1690 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
1691 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
1692 | cpu_relax(); |
1693 | ||
12e57169 | 1694 | return vi->ctrl->status == VIRTIO_NET_OK; |
40cbfc37 AK |
1695 | } |
1696 | ||
9c46f6d4 AW |
1697 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
1698 | { | |
1699 | struct virtnet_info *vi = netdev_priv(dev); | |
1700 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 1701 | int ret; |
e37e2ff3 | 1702 | struct sockaddr *addr; |
7e58d5ae | 1703 | struct scatterlist sg; |
9c46f6d4 | 1704 | |
ba5e4426 SS |
1705 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) |
1706 | return -EOPNOTSUPP; | |
1707 | ||
801822d1 | 1708 | addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); |
e37e2ff3 AL |
1709 | if (!addr) |
1710 | return -ENOMEM; | |
e37e2ff3 AL |
1711 | |
1712 | ret = eth_prepare_mac_addr_change(dev, addr); | |
f2f2c8b4 | 1713 | if (ret) |
e37e2ff3 | 1714 | goto out; |
9c46f6d4 | 1715 | |
7e58d5ae AK |
1716 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
1717 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
1718 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1719 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
7e58d5ae AK |
1720 | dev_warn(&vdev->dev, |
1721 | "Failed to set mac address by vq command.\n"); | |
e37e2ff3 AL |
1722 | ret = -EINVAL; |
1723 | goto out; | |
7e58d5ae | 1724 | } |
7e93a02f MT |
1725 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && |
1726 | !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
855e0c52 RR |
1727 | unsigned int i; |
1728 | ||
1729 | /* Naturally, this has an atomicity problem. */ | |
1730 | for (i = 0; i < dev->addr_len; i++) | |
1731 | virtio_cwrite8(vdev, | |
1732 | offsetof(struct virtio_net_config, mac) + | |
1733 | i, addr->sa_data[i]); | |
7e58d5ae AK |
1734 | } |
1735 | ||
1736 | eth_commit_mac_addr_change(dev, p); | |
e37e2ff3 | 1737 | ret = 0; |
9c46f6d4 | 1738 | |
e37e2ff3 AL |
1739 | out: |
1740 | kfree(addr); | |
1741 | return ret; | |
9c46f6d4 AW |
1742 | } |
1743 | ||
bc1f4470 | 1744 | static void virtnet_stats(struct net_device *dev, |
1745 | struct rtnl_link_stats64 *tot) | |
3fa2a1df | 1746 | { |
1747 | struct virtnet_info *vi = netdev_priv(dev); | |
3fa2a1df | 1748 | unsigned int start; |
d7dfc5cf | 1749 | int i; |
3fa2a1df | 1750 | |
d7dfc5cf | 1751 | for (i = 0; i < vi->max_queue_pairs; i++) { |
2c4a2f7d | 1752 | u64 tpackets, tbytes, rpackets, rbytes, rdrops; |
d7dfc5cf TM |
1753 | struct receive_queue *rq = &vi->rq[i]; |
1754 | struct send_queue *sq = &vi->sq[i]; | |
3fa2a1df | 1755 | |
1756 | do { | |
d7dfc5cf TM |
1757 | start = u64_stats_fetch_begin_irq(&sq->stats.syncp); |
1758 | tpackets = sq->stats.packets; | |
1759 | tbytes = sq->stats.bytes; | |
1760 | } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); | |
83a27052 ED |
1761 | |
1762 | do { | |
d7dfc5cf | 1763 | start = u64_stats_fetch_begin_irq(&rq->stats.syncp); |
d46eeeaf JW |
1764 | rpackets = rq->stats.packets; |
1765 | rbytes = rq->stats.bytes; | |
1766 | rdrops = rq->stats.drops; | |
d7dfc5cf | 1767 | } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); |
3fa2a1df | 1768 | |
1769 | tot->rx_packets += rpackets; | |
1770 | tot->tx_packets += tpackets; | |
1771 | tot->rx_bytes += rbytes; | |
1772 | tot->tx_bytes += tbytes; | |
2c4a2f7d | 1773 | tot->rx_dropped += rdrops; |
3fa2a1df | 1774 | } |
1775 | ||
1776 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 1777 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 1778 | tot->rx_length_errors = dev->stats.rx_length_errors; |
1779 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
3fa2a1df | 1780 | } |
1781 | ||
586d17c5 JW |
1782 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
1783 | { | |
1784 | rtnl_lock(); | |
1785 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
d24bae32 | 1786 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
586d17c5 JW |
1787 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
1788 | rtnl_unlock(); | |
1789 | } | |
1790 | ||
47315329 | 1791 | static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
986a4f4d JW |
1792 | { |
1793 | struct scatterlist sg; | |
986a4f4d JW |
1794 | struct net_device *dev = vi->dev; |
1795 | ||
1796 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
1797 | return 0; | |
1798 | ||
12e57169 MT |
1799 | vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
1800 | sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); | |
986a4f4d JW |
1801 | |
1802 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
d24bae32 | 1803 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
986a4f4d JW |
1804 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
1805 | queue_pairs); | |
1806 | return -EINVAL; | |
55257d72 | 1807 | } else { |
986a4f4d | 1808 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
1809 | /* virtnet_open() will refill when device is going to up. */ |
1810 | if (dev->flags & IFF_UP) | |
1811 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 1812 | } |
986a4f4d JW |
1813 | |
1814 | return 0; | |
1815 | } | |
1816 | ||
47315329 JF |
1817 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
1818 | { | |
1819 | int err; | |
1820 | ||
1821 | rtnl_lock(); | |
1822 | err = _virtnet_set_queues(vi, queue_pairs); | |
1823 | rtnl_unlock(); | |
1824 | return err; | |
1825 | } | |
1826 | ||
296f96fc RR |
1827 | static int virtnet_close(struct net_device *dev) |
1828 | { | |
1829 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1830 | int i; |
296f96fc | 1831 | |
b2baed69 RR |
1832 | /* Make sure refill_work doesn't re-enable napi! */ |
1833 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d | 1834 | |
b92f1e67 | 1835 | for (i = 0; i < vi->max_queue_pairs; i++) { |
754b8a21 | 1836 | xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); |
986a4f4d | 1837 | napi_disable(&vi->rq[i].napi); |
78a57b48 | 1838 | virtnet_napi_tx_disable(&vi->sq[i].napi); |
b92f1e67 | 1839 | } |
296f96fc | 1840 | |
296f96fc RR |
1841 | return 0; |
1842 | } | |
1843 | ||
2af7698e AW |
1844 | static void virtnet_set_rx_mode(struct net_device *dev) |
1845 | { | |
1846 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 1847 | struct scatterlist sg[2]; |
f565a7c2 | 1848 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 1849 | struct netdev_hw_addr *ha; |
32e7bfc4 | 1850 | int uc_count; |
4cd24eaf | 1851 | int mc_count; |
f565a7c2 AW |
1852 | void *buf; |
1853 | int i; | |
2af7698e | 1854 | |
788a8b6d | 1855 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
2af7698e AW |
1856 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
1857 | return; | |
1858 | ||
12e57169 MT |
1859 | vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); |
1860 | vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1861 | |
12e57169 | 1862 | sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); |
2af7698e AW |
1863 | |
1864 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1865 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
2af7698e | 1866 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
12e57169 | 1867 | vi->ctrl->promisc ? "en" : "dis"); |
2af7698e | 1868 | |
12e57169 | 1869 | sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); |
2af7698e AW |
1870 | |
1871 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1872 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
2af7698e | 1873 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
12e57169 | 1874 | vi->ctrl->allmulti ? "en" : "dis"); |
f565a7c2 | 1875 | |
32e7bfc4 | 1876 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1877 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1878 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1879 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1880 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1881 | mac_data = buf; | |
e68ed8f0 | 1882 | if (!buf) |
f565a7c2 | 1883 | return; |
f565a7c2 | 1884 | |
23e258e1 AW |
1885 | sg_init_table(sg, 2); |
1886 | ||
f565a7c2 | 1887 | /* Store the unicast list and count in the front of the buffer */ |
fdd819b2 | 1888 | mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); |
ccffad25 | 1889 | i = 0; |
32e7bfc4 | 1890 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1891 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1892 | |
1893 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1894 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1895 | |
1896 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1897 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1898 | |
fdd819b2 | 1899 | mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); |
567ec874 | 1900 | i = 0; |
22bedad3 JP |
1901 | netdev_for_each_mc_addr(ha, dev) |
1902 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1903 | |
1904 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1905 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1906 | |
1907 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1908 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
99e872ae | 1909 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
f565a7c2 AW |
1910 | |
1911 | kfree(buf); | |
2af7698e AW |
1912 | } |
1913 | ||
80d5c368 PM |
1914 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
1915 | __be16 proto, u16 vid) | |
0bde9569 AW |
1916 | { |
1917 | struct virtnet_info *vi = netdev_priv(dev); | |
1918 | struct scatterlist sg; | |
1919 | ||
d7fad4c8 | 1920 | vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); |
12e57169 | 1921 | sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); |
0bde9569 AW |
1922 | |
1923 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1924 | VIRTIO_NET_CTRL_VLAN_ADD, &sg)) |
0bde9569 | 1925 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1926 | return 0; |
0bde9569 AW |
1927 | } |
1928 | ||
80d5c368 PM |
1929 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1930 | __be16 proto, u16 vid) | |
0bde9569 AW |
1931 | { |
1932 | struct virtnet_info *vi = netdev_priv(dev); | |
1933 | struct scatterlist sg; | |
1934 | ||
d7fad4c8 | 1935 | vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); |
12e57169 | 1936 | sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); |
0bde9569 AW |
1937 | |
1938 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1939 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
0bde9569 | 1940 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1941 | return 0; |
0bde9569 AW |
1942 | } |
1943 | ||
310974fa | 1944 | static void virtnet_clean_affinity(struct virtnet_info *vi) |
986a4f4d JW |
1945 | { |
1946 | int i; | |
1947 | ||
8898c21c WG |
1948 | if (vi->affinity_hint_set) { |
1949 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
19e226e8 CR |
1950 | virtqueue_set_affinity(vi->rq[i].vq, NULL); |
1951 | virtqueue_set_affinity(vi->sq[i].vq, NULL); | |
47be2479 WG |
1952 | } |
1953 | ||
8898c21c WG |
1954 | vi->affinity_hint_set = false; |
1955 | } | |
8898c21c | 1956 | } |
47be2479 | 1957 | |
8898c21c WG |
1958 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1959 | { | |
2ca653d6 CR |
1960 | cpumask_var_t mask; |
1961 | int stragglers; | |
1962 | int group_size; | |
1963 | int i, j, cpu; | |
1964 | int num_cpu; | |
1965 | int stride; | |
1966 | ||
1967 | if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { | |
310974fa | 1968 | virtnet_clean_affinity(vi); |
8898c21c | 1969 | return; |
986a4f4d JW |
1970 | } |
1971 | ||
2ca653d6 CR |
1972 | num_cpu = num_online_cpus(); |
1973 | stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); | |
1974 | stragglers = num_cpu >= vi->curr_queue_pairs ? | |
1975 | num_cpu % vi->curr_queue_pairs : | |
1976 | 0; | |
1977 | cpu = cpumask_next(-1, cpu_online_mask); | |
4d99f660 | 1978 | |
2ca653d6 CR |
1979 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
1980 | group_size = stride + (i < stragglers ? 1 : 0); | |
1981 | ||
1982 | for (j = 0; j < group_size; j++) { | |
1983 | cpumask_set_cpu(cpu, mask); | |
1984 | cpu = cpumask_next_wrap(cpu, cpu_online_mask, | |
1985 | nr_cpu_ids, false); | |
1986 | } | |
1987 | virtqueue_set_affinity(vi->rq[i].vq, mask); | |
1988 | virtqueue_set_affinity(vi->sq[i].vq, mask); | |
1989 | __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, false); | |
1990 | cpumask_clear(mask); | |
986a4f4d JW |
1991 | } |
1992 | ||
8898c21c | 1993 | vi->affinity_hint_set = true; |
2ca653d6 | 1994 | free_cpumask_var(mask); |
986a4f4d JW |
1995 | } |
1996 | ||
8017c279 | 1997 | static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) |
8de4b2f3 | 1998 | { |
8017c279 SAS |
1999 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, |
2000 | node); | |
2001 | virtnet_set_affinity(vi); | |
2002 | return 0; | |
2003 | } | |
8de4b2f3 | 2004 | |
8017c279 SAS |
2005 | static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) |
2006 | { | |
2007 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
2008 | node_dead); | |
2009 | virtnet_set_affinity(vi); | |
2010 | return 0; | |
2011 | } | |
3ab098df | 2012 | |
8017c279 SAS |
2013 | static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) |
2014 | { | |
2015 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
2016 | node); | |
2017 | ||
310974fa | 2018 | virtnet_clean_affinity(vi); |
8017c279 SAS |
2019 | return 0; |
2020 | } | |
2021 | ||
2022 | static enum cpuhp_state virtionet_online; | |
2023 | ||
2024 | static int virtnet_cpu_notif_add(struct virtnet_info *vi) | |
2025 | { | |
2026 | int ret; | |
2027 | ||
2028 | ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); | |
2029 | if (ret) | |
2030 | return ret; | |
2031 | ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
2032 | &vi->node_dead); | |
2033 | if (!ret) | |
2034 | return ret; | |
2035 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
2036 | return ret; | |
2037 | } | |
2038 | ||
2039 | static void virtnet_cpu_notif_remove(struct virtnet_info *vi) | |
2040 | { | |
2041 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
2042 | cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
2043 | &vi->node_dead); | |
986a4f4d JW |
2044 | } |
2045 | ||
8f9f4668 RJ |
2046 | static void virtnet_get_ringparam(struct net_device *dev, |
2047 | struct ethtool_ringparam *ring) | |
2048 | { | |
2049 | struct virtnet_info *vi = netdev_priv(dev); | |
2050 | ||
986a4f4d JW |
2051 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
2052 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
2053 | ring->rx_pending = ring->rx_max_pending; |
2054 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
2055 | } |
2056 | ||
66846048 RJ |
2057 | |
2058 | static void virtnet_get_drvinfo(struct net_device *dev, | |
2059 | struct ethtool_drvinfo *info) | |
2060 | { | |
2061 | struct virtnet_info *vi = netdev_priv(dev); | |
2062 | struct virtio_device *vdev = vi->vdev; | |
2063 | ||
2064 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
2065 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
2066 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
2067 | ||
2068 | } | |
2069 | ||
d73bcd2c JW |
2070 | /* TODO: Eliminate OOO packets during switching */ |
2071 | static int virtnet_set_channels(struct net_device *dev, | |
2072 | struct ethtool_channels *channels) | |
2073 | { | |
2074 | struct virtnet_info *vi = netdev_priv(dev); | |
2075 | u16 queue_pairs = channels->combined_count; | |
2076 | int err; | |
2077 | ||
2078 | /* We don't support separate rx/tx channels. | |
2079 | * We don't allow setting 'other' channels. | |
2080 | */ | |
2081 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
2082 | return -EINVAL; | |
2083 | ||
c18e9cd6 | 2084 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
d73bcd2c JW |
2085 | return -EINVAL; |
2086 | ||
f600b690 JF |
2087 | /* For now we don't support modifying channels while XDP is loaded |
2088 | * also when XDP is loaded all RX queues have XDP programs so we only | |
2089 | * need to check a single RX queue. | |
2090 | */ | |
2091 | if (vi->rq[0].xdp_prog) | |
2092 | return -EINVAL; | |
2093 | ||
47be2479 | 2094 | get_online_cpus(); |
47315329 | 2095 | err = _virtnet_set_queues(vi, queue_pairs); |
de33212f JD |
2096 | if (err) { |
2097 | put_online_cpus(); | |
2098 | goto err; | |
d73bcd2c | 2099 | } |
de33212f | 2100 | virtnet_set_affinity(vi); |
47be2479 | 2101 | put_online_cpus(); |
d73bcd2c | 2102 | |
de33212f JD |
2103 | netif_set_real_num_tx_queues(dev, queue_pairs); |
2104 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
2105 | err: | |
d73bcd2c JW |
2106 | return err; |
2107 | } | |
2108 | ||
d7dfc5cf TM |
2109 | static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) |
2110 | { | |
2111 | struct virtnet_info *vi = netdev_priv(dev); | |
2112 | char *p = (char *)data; | |
2113 | unsigned int i, j; | |
2114 | ||
2115 | switch (stringset) { | |
2116 | case ETH_SS_STATS: | |
2117 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
2118 | for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { | |
2119 | snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s", | |
2120 | i, virtnet_rq_stats_desc[j].desc); | |
2121 | p += ETH_GSTRING_LEN; | |
2122 | } | |
2123 | } | |
2124 | ||
2125 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
2126 | for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { | |
2127 | snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s", | |
2128 | i, virtnet_sq_stats_desc[j].desc); | |
2129 | p += ETH_GSTRING_LEN; | |
2130 | } | |
2131 | } | |
2132 | break; | |
2133 | } | |
2134 | } | |
2135 | ||
2136 | static int virtnet_get_sset_count(struct net_device *dev, int sset) | |
2137 | { | |
2138 | struct virtnet_info *vi = netdev_priv(dev); | |
2139 | ||
2140 | switch (sset) { | |
2141 | case ETH_SS_STATS: | |
2142 | return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + | |
2143 | VIRTNET_SQ_STATS_LEN); | |
2144 | default: | |
2145 | return -EOPNOTSUPP; | |
2146 | } | |
2147 | } | |
2148 | ||
2149 | static void virtnet_get_ethtool_stats(struct net_device *dev, | |
2150 | struct ethtool_stats *stats, u64 *data) | |
2151 | { | |
2152 | struct virtnet_info *vi = netdev_priv(dev); | |
2153 | unsigned int idx = 0, start, i, j; | |
2154 | const u8 *stats_base; | |
2155 | size_t offset; | |
2156 | ||
2157 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
2158 | struct receive_queue *rq = &vi->rq[i]; | |
2159 | ||
d46eeeaf | 2160 | stats_base = (u8 *)&rq->stats; |
d7dfc5cf TM |
2161 | do { |
2162 | start = u64_stats_fetch_begin_irq(&rq->stats.syncp); | |
2163 | for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { | |
2164 | offset = virtnet_rq_stats_desc[j].offset; | |
2165 | data[idx + j] = *(u64 *)(stats_base + offset); | |
2166 | } | |
2167 | } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); | |
2168 | idx += VIRTNET_RQ_STATS_LEN; | |
2169 | } | |
2170 | ||
2171 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
2172 | struct send_queue *sq = &vi->sq[i]; | |
2173 | ||
2174 | stats_base = (u8 *)&sq->stats; | |
2175 | do { | |
2176 | start = u64_stats_fetch_begin_irq(&sq->stats.syncp); | |
2177 | for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { | |
2178 | offset = virtnet_sq_stats_desc[j].offset; | |
2179 | data[idx + j] = *(u64 *)(stats_base + offset); | |
2180 | } | |
2181 | } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); | |
2182 | idx += VIRTNET_SQ_STATS_LEN; | |
2183 | } | |
2184 | } | |
2185 | ||
d73bcd2c JW |
2186 | static void virtnet_get_channels(struct net_device *dev, |
2187 | struct ethtool_channels *channels) | |
2188 | { | |
2189 | struct virtnet_info *vi = netdev_priv(dev); | |
2190 | ||
2191 | channels->combined_count = vi->curr_queue_pairs; | |
2192 | channels->max_combined = vi->max_queue_pairs; | |
2193 | channels->max_other = 0; | |
2194 | channels->rx_count = 0; | |
2195 | channels->tx_count = 0; | |
2196 | channels->other_count = 0; | |
2197 | } | |
2198 | ||
ebb6b4b1 PR |
2199 | static int virtnet_set_link_ksettings(struct net_device *dev, |
2200 | const struct ethtool_link_ksettings *cmd) | |
16032be5 NA |
2201 | { |
2202 | struct virtnet_info *vi = netdev_priv(dev); | |
16032be5 | 2203 | |
9aedc6e2 CF |
2204 | return ethtool_virtdev_set_link_ksettings(dev, cmd, |
2205 | &vi->speed, &vi->duplex); | |
16032be5 NA |
2206 | } |
2207 | ||
ebb6b4b1 PR |
2208 | static int virtnet_get_link_ksettings(struct net_device *dev, |
2209 | struct ethtool_link_ksettings *cmd) | |
16032be5 NA |
2210 | { |
2211 | struct virtnet_info *vi = netdev_priv(dev); | |
2212 | ||
ebb6b4b1 PR |
2213 | cmd->base.speed = vi->speed; |
2214 | cmd->base.duplex = vi->duplex; | |
2215 | cmd->base.port = PORT_OTHER; | |
16032be5 NA |
2216 | |
2217 | return 0; | |
2218 | } | |
2219 | ||
0c465be1 JW |
2220 | static int virtnet_set_coalesce(struct net_device *dev, |
2221 | struct ethtool_coalesce *ec) | |
2222 | { | |
0c465be1 JW |
2223 | struct virtnet_info *vi = netdev_priv(dev); |
2224 | int i, napi_weight; | |
2225 | ||
a51e5206 JK |
2226 | if (ec->tx_max_coalesced_frames > 1 || |
2227 | ec->rx_max_coalesced_frames != 1) | |
0c465be1 JW |
2228 | return -EINVAL; |
2229 | ||
0c465be1 | 2230 | napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0; |
0c465be1 JW |
2231 | if (napi_weight ^ vi->sq[0].napi.weight) { |
2232 | if (dev->flags & IFF_UP) | |
2233 | return -EBUSY; | |
2234 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2235 | vi->sq[i].napi.weight = napi_weight; | |
2236 | } | |
2237 | ||
2238 | return 0; | |
2239 | } | |
2240 | ||
2241 | static int virtnet_get_coalesce(struct net_device *dev, | |
2242 | struct ethtool_coalesce *ec) | |
2243 | { | |
2244 | struct ethtool_coalesce ec_default = { | |
2245 | .cmd = ETHTOOL_GCOALESCE, | |
2246 | .rx_max_coalesced_frames = 1, | |
2247 | }; | |
2248 | struct virtnet_info *vi = netdev_priv(dev); | |
2249 | ||
2250 | memcpy(ec, &ec_default, sizeof(ec_default)); | |
2251 | ||
2252 | if (vi->sq[0].napi.weight) | |
2253 | ec->tx_max_coalesced_frames = 1; | |
2254 | ||
2255 | return 0; | |
2256 | } | |
2257 | ||
16032be5 NA |
2258 | static void virtnet_init_settings(struct net_device *dev) |
2259 | { | |
2260 | struct virtnet_info *vi = netdev_priv(dev); | |
2261 | ||
2262 | vi->speed = SPEED_UNKNOWN; | |
2263 | vi->duplex = DUPLEX_UNKNOWN; | |
2264 | } | |
2265 | ||
faa9b39f JB |
2266 | static void virtnet_update_settings(struct virtnet_info *vi) |
2267 | { | |
2268 | u32 speed; | |
2269 | u8 duplex; | |
2270 | ||
2271 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) | |
2272 | return; | |
2273 | ||
64ffa39d MT |
2274 | virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed); |
2275 | ||
faa9b39f JB |
2276 | if (ethtool_validate_speed(speed)) |
2277 | vi->speed = speed; | |
64ffa39d MT |
2278 | |
2279 | virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex); | |
2280 | ||
faa9b39f JB |
2281 | if (ethtool_validate_duplex(duplex)) |
2282 | vi->duplex = duplex; | |
2283 | } | |
2284 | ||
0fc0b732 | 2285 | static const struct ethtool_ops virtnet_ethtool_ops = { |
a51e5206 | 2286 | .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES, |
66846048 | 2287 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 2288 | .get_link = ethtool_op_get_link, |
8f9f4668 | 2289 | .get_ringparam = virtnet_get_ringparam, |
d7dfc5cf TM |
2290 | .get_strings = virtnet_get_strings, |
2291 | .get_sset_count = virtnet_get_sset_count, | |
2292 | .get_ethtool_stats = virtnet_get_ethtool_stats, | |
d73bcd2c JW |
2293 | .set_channels = virtnet_set_channels, |
2294 | .get_channels = virtnet_get_channels, | |
074c3582 | 2295 | .get_ts_info = ethtool_op_get_ts_info, |
ebb6b4b1 PR |
2296 | .get_link_ksettings = virtnet_get_link_ksettings, |
2297 | .set_link_ksettings = virtnet_set_link_ksettings, | |
0c465be1 JW |
2298 | .set_coalesce = virtnet_set_coalesce, |
2299 | .get_coalesce = virtnet_get_coalesce, | |
a9ea3fc6 HX |
2300 | }; |
2301 | ||
9fe7bfce JF |
2302 | static void virtnet_freeze_down(struct virtio_device *vdev) |
2303 | { | |
2304 | struct virtnet_info *vi = vdev->priv; | |
2305 | int i; | |
2306 | ||
2307 | /* Make sure no work handler is accessing the device */ | |
2308 | flush_work(&vi->config_work); | |
2309 | ||
05c998b7 | 2310 | netif_tx_lock_bh(vi->dev); |
9fe7bfce | 2311 | netif_device_detach(vi->dev); |
05c998b7 | 2312 | netif_tx_unlock_bh(vi->dev); |
9fe7bfce JF |
2313 | cancel_delayed_work_sync(&vi->refill); |
2314 | ||
2315 | if (netif_running(vi->dev)) { | |
b92f1e67 | 2316 | for (i = 0; i < vi->max_queue_pairs; i++) { |
9fe7bfce | 2317 | napi_disable(&vi->rq[i].napi); |
78a57b48 | 2318 | virtnet_napi_tx_disable(&vi->sq[i].napi); |
b92f1e67 | 2319 | } |
9fe7bfce JF |
2320 | } |
2321 | } | |
2322 | ||
2323 | static int init_vqs(struct virtnet_info *vi); | |
2324 | ||
2325 | static int virtnet_restore_up(struct virtio_device *vdev) | |
2326 | { | |
2327 | struct virtnet_info *vi = vdev->priv; | |
2328 | int err, i; | |
2329 | ||
2330 | err = init_vqs(vi); | |
2331 | if (err) | |
2332 | return err; | |
2333 | ||
2334 | virtio_device_ready(vdev); | |
2335 | ||
2336 | if (netif_running(vi->dev)) { | |
2337 | for (i = 0; i < vi->curr_queue_pairs; i++) | |
2338 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) | |
2339 | schedule_delayed_work(&vi->refill, 0); | |
2340 | ||
b92f1e67 | 2341 | for (i = 0; i < vi->max_queue_pairs; i++) { |
e4e8452a | 2342 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
b92f1e67 WB |
2343 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, |
2344 | &vi->sq[i].napi); | |
2345 | } | |
9fe7bfce JF |
2346 | } |
2347 | ||
05c998b7 | 2348 | netif_tx_lock_bh(vi->dev); |
9fe7bfce | 2349 | netif_device_attach(vi->dev); |
05c998b7 | 2350 | netif_tx_unlock_bh(vi->dev); |
9fe7bfce JF |
2351 | return err; |
2352 | } | |
2353 | ||
3f93522f JW |
2354 | static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) |
2355 | { | |
2356 | struct scatterlist sg; | |
12e57169 | 2357 | vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); |
3f93522f | 2358 | |
12e57169 | 2359 | sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); |
3f93522f JW |
2360 | |
2361 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, | |
2362 | VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { | |
7934b481 | 2363 | dev_warn(&vi->dev->dev, "Fail to set guest offload.\n"); |
3f93522f JW |
2364 | return -EINVAL; |
2365 | } | |
2366 | ||
2367 | return 0; | |
2368 | } | |
2369 | ||
2370 | static int virtnet_clear_guest_offloads(struct virtnet_info *vi) | |
2371 | { | |
2372 | u64 offloads = 0; | |
2373 | ||
2374 | if (!vi->guest_offloads) | |
2375 | return 0; | |
2376 | ||
3f93522f JW |
2377 | return virtnet_set_guest_offloads(vi, offloads); |
2378 | } | |
2379 | ||
2380 | static int virtnet_restore_guest_offloads(struct virtnet_info *vi) | |
2381 | { | |
2382 | u64 offloads = vi->guest_offloads; | |
2383 | ||
2384 | if (!vi->guest_offloads) | |
2385 | return 0; | |
3f93522f JW |
2386 | |
2387 | return virtnet_set_guest_offloads(vi, offloads); | |
2388 | } | |
2389 | ||
9861ce03 JK |
2390 | static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
2391 | struct netlink_ext_ack *extack) | |
f600b690 JF |
2392 | { |
2393 | unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); | |
2394 | struct virtnet_info *vi = netdev_priv(dev); | |
2395 | struct bpf_prog *old_prog; | |
017b29c3 | 2396 | u16 xdp_qp = 0, curr_qp; |
672aafd5 | 2397 | int i, err; |
f600b690 | 2398 | |
3f93522f JW |
2399 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) |
2400 | && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || | |
2401 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
2402 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || | |
18ba58e1 JW |
2403 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || |
2404 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) { | |
2405 | NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO/CSUM, disable LRO/CSUM first"); | |
f600b690 JF |
2406 | return -EOPNOTSUPP; |
2407 | } | |
2408 | ||
2409 | if (vi->mergeable_rx_bufs && !vi->any_header_sg) { | |
4d463c4d | 2410 | NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); |
f600b690 JF |
2411 | return -EINVAL; |
2412 | } | |
2413 | ||
2414 | if (dev->mtu > max_sz) { | |
4d463c4d | 2415 | NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP"); |
f600b690 JF |
2416 | netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); |
2417 | return -EINVAL; | |
2418 | } | |
2419 | ||
672aafd5 JF |
2420 | curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; |
2421 | if (prog) | |
2422 | xdp_qp = nr_cpu_ids; | |
2423 | ||
2424 | /* XDP requires extra queues for XDP_TX */ | |
2425 | if (curr_qp + xdp_qp > vi->max_queue_pairs) { | |
4d463c4d | 2426 | NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available"); |
672aafd5 JF |
2427 | netdev_warn(dev, "request %i queues but max is %i\n", |
2428 | curr_qp + xdp_qp, vi->max_queue_pairs); | |
2429 | return -ENOMEM; | |
2430 | } | |
2431 | ||
03aa6d34 TM |
2432 | old_prog = rtnl_dereference(vi->rq[0].xdp_prog); |
2433 | if (!prog && !old_prog) | |
2434 | return 0; | |
2435 | ||
85192dbf AN |
2436 | if (prog) |
2437 | bpf_prog_add(prog, vi->max_queue_pairs - 1); | |
2de2f7f4 | 2438 | |
4941d472 | 2439 | /* Make sure NAPI is not using any XDP TX queues for RX. */ |
534da5e8 TM |
2440 | if (netif_running(dev)) { |
2441 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
4e09ff53 | 2442 | napi_disable(&vi->rq[i].napi); |
534da5e8 TM |
2443 | virtnet_napi_tx_disable(&vi->sq[i].napi); |
2444 | } | |
2445 | } | |
f600b690 | 2446 | |
03aa6d34 TM |
2447 | if (!prog) { |
2448 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2449 | rcu_assign_pointer(vi->rq[i].xdp_prog, prog); | |
2450 | if (i == 0) | |
2451 | virtnet_restore_guest_offloads(vi); | |
2452 | } | |
2453 | synchronize_net(); | |
2454 | } | |
f600b690 | 2455 | |
4941d472 JW |
2456 | err = _virtnet_set_queues(vi, curr_qp + xdp_qp); |
2457 | if (err) | |
2458 | goto err; | |
188313c1 | 2459 | netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); |
4941d472 | 2460 | vi->xdp_queue_pairs = xdp_qp; |
672aafd5 | 2461 | |
03aa6d34 TM |
2462 | if (prog) { |
2463 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2464 | rcu_assign_pointer(vi->rq[i].xdp_prog, prog); | |
2465 | if (i == 0 && !old_prog) | |
3f93522f | 2466 | virtnet_clear_guest_offloads(vi); |
3f93522f | 2467 | } |
03aa6d34 TM |
2468 | } |
2469 | ||
2470 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
f600b690 JF |
2471 | if (old_prog) |
2472 | bpf_prog_put(old_prog); | |
534da5e8 | 2473 | if (netif_running(dev)) { |
4e09ff53 | 2474 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
534da5e8 TM |
2475 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, |
2476 | &vi->sq[i].napi); | |
2477 | } | |
f600b690 JF |
2478 | } |
2479 | ||
2480 | return 0; | |
2de2f7f4 | 2481 | |
4941d472 | 2482 | err: |
03aa6d34 TM |
2483 | if (!prog) { |
2484 | virtnet_clear_guest_offloads(vi); | |
2485 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2486 | rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog); | |
2487 | } | |
2488 | ||
8be4d9a4 | 2489 | if (netif_running(dev)) { |
534da5e8 | 2490 | for (i = 0; i < vi->max_queue_pairs; i++) { |
8be4d9a4 | 2491 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
534da5e8 TM |
2492 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, |
2493 | &vi->sq[i].napi); | |
2494 | } | |
8be4d9a4 | 2495 | } |
2de2f7f4 JF |
2496 | if (prog) |
2497 | bpf_prog_sub(prog, vi->max_queue_pairs - 1); | |
2498 | return err; | |
f600b690 JF |
2499 | } |
2500 | ||
f4e63525 | 2501 | static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
f600b690 JF |
2502 | { |
2503 | switch (xdp->command) { | |
2504 | case XDP_SETUP_PROG: | |
9861ce03 | 2505 | return virtnet_xdp_set(dev, xdp->prog, xdp->extack); |
f600b690 JF |
2506 | default: |
2507 | return -EINVAL; | |
2508 | } | |
2509 | } | |
2510 | ||
ba5e4426 SS |
2511 | static int virtnet_get_phys_port_name(struct net_device *dev, char *buf, |
2512 | size_t len) | |
2513 | { | |
2514 | struct virtnet_info *vi = netdev_priv(dev); | |
2515 | int ret; | |
2516 | ||
2517 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) | |
2518 | return -EOPNOTSUPP; | |
2519 | ||
2520 | ret = snprintf(buf, len, "sby"); | |
2521 | if (ret >= len) | |
2522 | return -EOPNOTSUPP; | |
2523 | ||
2524 | return 0; | |
2525 | } | |
2526 | ||
a02e8964 WB |
2527 | static int virtnet_set_features(struct net_device *dev, |
2528 | netdev_features_t features) | |
2529 | { | |
2530 | struct virtnet_info *vi = netdev_priv(dev); | |
cf8691cb | 2531 | u64 offloads; |
a02e8964 WB |
2532 | int err; |
2533 | ||
3618ad2a | 2534 | if ((dev->features ^ features) & NETIF_F_LRO) { |
cf8691cb MT |
2535 | if (vi->xdp_queue_pairs) |
2536 | return -EBUSY; | |
2537 | ||
a02e8964 | 2538 | if (features & NETIF_F_LRO) |
cf8691cb | 2539 | offloads = vi->guest_offloads_capable; |
a02e8964 | 2540 | else |
cf8691cb MT |
2541 | offloads = vi->guest_offloads_capable & |
2542 | ~GUEST_OFFLOAD_LRO_MASK; | |
a02e8964 | 2543 | |
cf8691cb MT |
2544 | err = virtnet_set_guest_offloads(vi, offloads); |
2545 | if (err) | |
2546 | return err; | |
2547 | vi->guest_offloads = offloads; | |
a02e8964 WB |
2548 | } |
2549 | ||
2550 | return 0; | |
2551 | } | |
2552 | ||
76288b4e SH |
2553 | static const struct net_device_ops virtnet_netdev = { |
2554 | .ndo_open = virtnet_open, | |
2555 | .ndo_stop = virtnet_close, | |
2556 | .ndo_start_xmit = start_xmit, | |
2557 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 2558 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 2559 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
3fa2a1df | 2560 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
2561 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
2562 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
f4e63525 | 2563 | .ndo_bpf = virtnet_xdp, |
186b3c99 | 2564 | .ndo_xdp_xmit = virtnet_xdp_xmit, |
2836b4f2 | 2565 | .ndo_features_check = passthru_features_check, |
ba5e4426 | 2566 | .ndo_get_phys_port_name = virtnet_get_phys_port_name, |
a02e8964 | 2567 | .ndo_set_features = virtnet_set_features, |
76288b4e SH |
2568 | }; |
2569 | ||
586d17c5 | 2570 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 2571 | { |
586d17c5 JW |
2572 | struct virtnet_info *vi = |
2573 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
2574 | u16 v; |
2575 | ||
855e0c52 RR |
2576 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
2577 | struct virtio_net_config, status, &v) < 0) | |
507613bf | 2578 | return; |
586d17c5 JW |
2579 | |
2580 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 2581 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
2582 | virtnet_ack_link_announce(vi); |
2583 | } | |
9f4d26d0 MM |
2584 | |
2585 | /* Ignore unknown (future) status bits */ | |
2586 | v &= VIRTIO_NET_S_LINK_UP; | |
2587 | ||
2588 | if (vi->status == v) | |
507613bf | 2589 | return; |
9f4d26d0 MM |
2590 | |
2591 | vi->status = v; | |
2592 | ||
2593 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
faa9b39f | 2594 | virtnet_update_settings(vi); |
9f4d26d0 | 2595 | netif_carrier_on(vi->dev); |
986a4f4d | 2596 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
2597 | } else { |
2598 | netif_carrier_off(vi->dev); | |
986a4f4d | 2599 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 MM |
2600 | } |
2601 | } | |
2602 | ||
2603 | static void virtnet_config_changed(struct virtio_device *vdev) | |
2604 | { | |
2605 | struct virtnet_info *vi = vdev->priv; | |
2606 | ||
3b07e9ca | 2607 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
2608 | } |
2609 | ||
986a4f4d JW |
2610 | static void virtnet_free_queues(struct virtnet_info *vi) |
2611 | { | |
d4fb84ee AV |
2612 | int i; |
2613 | ||
ab3971b1 | 2614 | for (i = 0; i < vi->max_queue_pairs; i++) { |
5198d545 JK |
2615 | __netif_napi_del(&vi->rq[i].napi); |
2616 | __netif_napi_del(&vi->sq[i].napi); | |
ab3971b1 | 2617 | } |
d4fb84ee | 2618 | |
5198d545 | 2619 | /* We called __netif_napi_del(), |
963abe5c ED |
2620 | * we need to respect an RCU grace period before freeing vi->rq |
2621 | */ | |
2622 | synchronize_net(); | |
2623 | ||
986a4f4d JW |
2624 | kfree(vi->rq); |
2625 | kfree(vi->sq); | |
12e57169 | 2626 | kfree(vi->ctrl); |
986a4f4d JW |
2627 | } |
2628 | ||
47315329 | 2629 | static void _free_receive_bufs(struct virtnet_info *vi) |
986a4f4d | 2630 | { |
f600b690 | 2631 | struct bpf_prog *old_prog; |
986a4f4d JW |
2632 | int i; |
2633 | ||
2634 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2635 | while (vi->rq[i].pages) | |
2636 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
f600b690 JF |
2637 | |
2638 | old_prog = rtnl_dereference(vi->rq[i].xdp_prog); | |
2639 | RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); | |
2640 | if (old_prog) | |
2641 | bpf_prog_put(old_prog); | |
986a4f4d | 2642 | } |
47315329 JF |
2643 | } |
2644 | ||
2645 | static void free_receive_bufs(struct virtnet_info *vi) | |
2646 | { | |
2647 | rtnl_lock(); | |
2648 | _free_receive_bufs(vi); | |
f600b690 | 2649 | rtnl_unlock(); |
986a4f4d JW |
2650 | } |
2651 | ||
fb51879d MD |
2652 | static void free_receive_page_frags(struct virtnet_info *vi) |
2653 | { | |
2654 | int i; | |
2655 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2656 | if (vi->rq[i].alloc_frag.page) | |
2657 | put_page(vi->rq[i].alloc_frag.page); | |
2658 | } | |
2659 | ||
986a4f4d JW |
2660 | static void free_unused_bufs(struct virtnet_info *vi) |
2661 | { | |
2662 | void *buf; | |
2663 | int i; | |
2664 | ||
2665 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2666 | struct virtqueue *vq = vi->sq[i].vq; | |
56434a01 | 2667 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { |
5050471d | 2668 | if (!is_xdp_frame(buf)) |
56434a01 JF |
2669 | dev_kfree_skb(buf); |
2670 | else | |
5050471d | 2671 | xdp_return_frame(ptr_to_xdp(buf)); |
56434a01 | 2672 | } |
986a4f4d JW |
2673 | } |
2674 | ||
2675 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2676 | struct virtqueue *vq = vi->rq[i].vq; | |
2677 | ||
2678 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
ab7db917 | 2679 | if (vi->mergeable_rx_bufs) { |
680557cf | 2680 | put_page(virt_to_head_page(buf)); |
ab7db917 | 2681 | } else if (vi->big_packets) { |
fa9fac17 | 2682 | give_pages(&vi->rq[i], buf); |
ab7db917 | 2683 | } else { |
f6b10209 | 2684 | put_page(virt_to_head_page(buf)); |
ab7db917 | 2685 | } |
986a4f4d | 2686 | } |
986a4f4d JW |
2687 | } |
2688 | } | |
2689 | ||
e9d7417b JW |
2690 | static void virtnet_del_vqs(struct virtnet_info *vi) |
2691 | { | |
2692 | struct virtio_device *vdev = vi->vdev; | |
2693 | ||
310974fa | 2694 | virtnet_clean_affinity(vi); |
986a4f4d | 2695 | |
e9d7417b | 2696 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
2697 | |
2698 | virtnet_free_queues(vi); | |
e9d7417b JW |
2699 | } |
2700 | ||
d85b758f MT |
2701 | /* How large should a single buffer be so a queue full of these can fit at |
2702 | * least one full packet? | |
2703 | * Logic below assumes the mergeable buffer header is used. | |
2704 | */ | |
2705 | static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) | |
2706 | { | |
2707 | const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); | |
2708 | unsigned int rq_size = virtqueue_get_vring_size(vq); | |
2709 | unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; | |
2710 | unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; | |
2711 | unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); | |
2712 | ||
f0c3192c MT |
2713 | return max(max(min_buf_len, hdr_len) - hdr_len, |
2714 | (unsigned int)GOOD_PACKET_LEN); | |
d85b758f MT |
2715 | } |
2716 | ||
986a4f4d | 2717 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 2718 | { |
986a4f4d JW |
2719 | vq_callback_t **callbacks; |
2720 | struct virtqueue **vqs; | |
2721 | int ret = -ENOMEM; | |
2722 | int i, total_vqs; | |
2723 | const char **names; | |
d45b897b | 2724 | bool *ctx; |
986a4f4d JW |
2725 | |
2726 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
2727 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
2728 | * possible control vq. | |
2729 | */ | |
2730 | total_vqs = vi->max_queue_pairs * 2 + | |
2731 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
2732 | ||
2733 | /* Allocate space for find_vqs parameters */ | |
6396bb22 | 2734 | vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); |
986a4f4d JW |
2735 | if (!vqs) |
2736 | goto err_vq; | |
6da2ec56 | 2737 | callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL); |
986a4f4d JW |
2738 | if (!callbacks) |
2739 | goto err_callback; | |
6da2ec56 | 2740 | names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL); |
986a4f4d JW |
2741 | if (!names) |
2742 | goto err_names; | |
192f68cf | 2743 | if (!vi->big_packets || vi->mergeable_rx_bufs) { |
6396bb22 | 2744 | ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); |
d45b897b MT |
2745 | if (!ctx) |
2746 | goto err_ctx; | |
2747 | } else { | |
2748 | ctx = NULL; | |
2749 | } | |
986a4f4d JW |
2750 | |
2751 | /* Parameters for control virtqueue, if any */ | |
2752 | if (vi->has_cvq) { | |
2753 | callbacks[total_vqs - 1] = NULL; | |
2754 | names[total_vqs - 1] = "control"; | |
2755 | } | |
3f9c10b0 | 2756 | |
986a4f4d JW |
2757 | /* Allocate/initialize parameters for send/receive virtqueues */ |
2758 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2759 | callbacks[rxq2vq(i)] = skb_recv_done; | |
2760 | callbacks[txq2vq(i)] = skb_xmit_done; | |
2761 | sprintf(vi->rq[i].name, "input.%d", i); | |
2762 | sprintf(vi->sq[i].name, "output.%d", i); | |
2763 | names[rxq2vq(i)] = vi->rq[i].name; | |
2764 | names[txq2vq(i)] = vi->sq[i].name; | |
d45b897b MT |
2765 | if (ctx) |
2766 | ctx[rxq2vq(i)] = true; | |
986a4f4d | 2767 | } |
3f9c10b0 | 2768 | |
986a4f4d | 2769 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
d45b897b | 2770 | names, ctx, NULL); |
986a4f4d JW |
2771 | if (ret) |
2772 | goto err_find; | |
3f9c10b0 | 2773 | |
986a4f4d JW |
2774 | if (vi->has_cvq) { |
2775 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 2776 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 2777 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 2778 | } |
986a4f4d JW |
2779 | |
2780 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2781 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
d85b758f | 2782 | vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); |
986a4f4d JW |
2783 | vi->sq[i].vq = vqs[txq2vq(i)]; |
2784 | } | |
2785 | ||
2fa3c8a8 | 2786 | /* run here: ret == 0. */ |
986a4f4d | 2787 | |
986a4f4d JW |
2788 | |
2789 | err_find: | |
d45b897b MT |
2790 | kfree(ctx); |
2791 | err_ctx: | |
986a4f4d JW |
2792 | kfree(names); |
2793 | err_names: | |
2794 | kfree(callbacks); | |
2795 | err_callback: | |
2796 | kfree(vqs); | |
2797 | err_vq: | |
2798 | return ret; | |
2799 | } | |
2800 | ||
2801 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
2802 | { | |
2803 | int i; | |
2804 | ||
12e57169 MT |
2805 | vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); |
2806 | if (!vi->ctrl) | |
2807 | goto err_ctrl; | |
6396bb22 | 2808 | vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL); |
986a4f4d JW |
2809 | if (!vi->sq) |
2810 | goto err_sq; | |
6396bb22 | 2811 | vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL); |
008d4278 | 2812 | if (!vi->rq) |
986a4f4d JW |
2813 | goto err_rq; |
2814 | ||
2815 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
2816 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2817 | vi->rq[i].pages = NULL; | |
2818 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
2819 | napi_weight); | |
1d11e732 WB |
2820 | netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx, |
2821 | napi_tx ? napi_weight : 0); | |
986a4f4d JW |
2822 | |
2823 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
5377d758 | 2824 | ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); |
986a4f4d | 2825 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); |
d7dfc5cf TM |
2826 | |
2827 | u64_stats_init(&vi->rq[i].stats.syncp); | |
2828 | u64_stats_init(&vi->sq[i].stats.syncp); | |
986a4f4d JW |
2829 | } |
2830 | ||
2831 | return 0; | |
2832 | ||
2833 | err_rq: | |
2834 | kfree(vi->sq); | |
2835 | err_sq: | |
12e57169 MT |
2836 | kfree(vi->ctrl); |
2837 | err_ctrl: | |
986a4f4d JW |
2838 | return -ENOMEM; |
2839 | } | |
2840 | ||
2841 | static int init_vqs(struct virtnet_info *vi) | |
2842 | { | |
2843 | int ret; | |
2844 | ||
2845 | /* Allocate send & receive queues */ | |
2846 | ret = virtnet_alloc_queues(vi); | |
2847 | if (ret) | |
2848 | goto err; | |
2849 | ||
2850 | ret = virtnet_find_vqs(vi); | |
2851 | if (ret) | |
2852 | goto err_free; | |
2853 | ||
47be2479 | 2854 | get_online_cpus(); |
8898c21c | 2855 | virtnet_set_affinity(vi); |
47be2479 WG |
2856 | put_online_cpus(); |
2857 | ||
986a4f4d JW |
2858 | return 0; |
2859 | ||
2860 | err_free: | |
2861 | virtnet_free_queues(vi); | |
2862 | err: | |
2863 | return ret; | |
3f9c10b0 AS |
2864 | } |
2865 | ||
fbf28d78 MD |
2866 | #ifdef CONFIG_SYSFS |
2867 | static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, | |
718ad681 | 2868 | char *buf) |
fbf28d78 MD |
2869 | { |
2870 | struct virtnet_info *vi = netdev_priv(queue->dev); | |
2871 | unsigned int queue_index = get_netdev_rx_queue_index(queue); | |
3cc81a9a JW |
2872 | unsigned int headroom = virtnet_get_headroom(vi); |
2873 | unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; | |
5377d758 | 2874 | struct ewma_pkt_len *avg; |
fbf28d78 MD |
2875 | |
2876 | BUG_ON(queue_index >= vi->max_queue_pairs); | |
2877 | avg = &vi->rq[queue_index].mrg_avg_pkt_len; | |
d85b758f | 2878 | return sprintf(buf, "%u\n", |
3cc81a9a JW |
2879 | get_mergeable_buf_len(&vi->rq[queue_index], avg, |
2880 | SKB_DATA_ALIGN(headroom + tailroom))); | |
fbf28d78 MD |
2881 | } |
2882 | ||
2883 | static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = | |
2884 | __ATTR_RO(mergeable_rx_buffer_size); | |
2885 | ||
2886 | static struct attribute *virtio_net_mrg_rx_attrs[] = { | |
2887 | &mergeable_rx_buffer_size_attribute.attr, | |
2888 | NULL | |
2889 | }; | |
2890 | ||
2891 | static const struct attribute_group virtio_net_mrg_rx_group = { | |
2892 | .name = "virtio_net", | |
2893 | .attrs = virtio_net_mrg_rx_attrs | |
2894 | }; | |
2895 | #endif | |
2896 | ||
892d6eb1 JW |
2897 | static bool virtnet_fail_on_feature(struct virtio_device *vdev, |
2898 | unsigned int fbit, | |
2899 | const char *fname, const char *dname) | |
2900 | { | |
2901 | if (!virtio_has_feature(vdev, fbit)) | |
2902 | return false; | |
2903 | ||
2904 | dev_err(&vdev->dev, "device advertises feature %s but not %s", | |
2905 | fname, dname); | |
2906 | ||
2907 | return true; | |
2908 | } | |
2909 | ||
2910 | #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ | |
2911 | virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) | |
2912 | ||
2913 | static bool virtnet_validate_features(struct virtio_device *vdev) | |
2914 | { | |
2915 | if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && | |
2916 | (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, | |
2917 | "VIRTIO_NET_F_CTRL_VQ") || | |
2918 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, | |
2919 | "VIRTIO_NET_F_CTRL_VQ") || | |
2920 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, | |
2921 | "VIRTIO_NET_F_CTRL_VQ") || | |
2922 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || | |
2923 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, | |
2924 | "VIRTIO_NET_F_CTRL_VQ"))) { | |
2925 | return false; | |
2926 | } | |
2927 | ||
2928 | return true; | |
2929 | } | |
2930 | ||
d0c2c997 JW |
2931 | #define MIN_MTU ETH_MIN_MTU |
2932 | #define MAX_MTU ETH_MAX_MTU | |
2933 | ||
fe36cbe0 | 2934 | static int virtnet_validate(struct virtio_device *vdev) |
296f96fc | 2935 | { |
6ba42248 MT |
2936 | if (!vdev->config->get) { |
2937 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
2938 | __func__); | |
2939 | return -EINVAL; | |
2940 | } | |
2941 | ||
892d6eb1 JW |
2942 | if (!virtnet_validate_features(vdev)) |
2943 | return -EINVAL; | |
2944 | ||
fe36cbe0 MT |
2945 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
2946 | int mtu = virtio_cread16(vdev, | |
2947 | offsetof(struct virtio_net_config, | |
2948 | mtu)); | |
2949 | if (mtu < MIN_MTU) | |
2950 | __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); | |
2951 | } | |
2952 | ||
2953 | return 0; | |
2954 | } | |
2955 | ||
2956 | static int virtnet_probe(struct virtio_device *vdev) | |
2957 | { | |
d7dfc5cf | 2958 | int i, err = -ENOMEM; |
fe36cbe0 MT |
2959 | struct net_device *dev; |
2960 | struct virtnet_info *vi; | |
2961 | u16 max_queue_pairs; | |
2962 | int mtu; | |
2963 | ||
986a4f4d | 2964 | /* Find if host supports multiqueue virtio_net device */ |
855e0c52 RR |
2965 | err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, |
2966 | struct virtio_net_config, | |
2967 | max_virtqueue_pairs, &max_queue_pairs); | |
986a4f4d JW |
2968 | |
2969 | /* We need at least 2 queue's */ | |
2970 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
2971 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
2972 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
2973 | max_queue_pairs = 1; | |
296f96fc RR |
2974 | |
2975 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 2976 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
2977 | if (!dev) |
2978 | return -ENOMEM; | |
2979 | ||
2980 | /* Set up network device as normal. */ | |
f2f2c8b4 | 2981 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 2982 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 2983 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 2984 | |
7ad24ea4 | 2985 | dev->ethtool_ops = &virtnet_ethtool_ops; |
296f96fc RR |
2986 | SET_NETDEV_DEV(dev, &vdev->dev); |
2987 | ||
2988 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 2989 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 2990 | /* This opens up the world of extra features. */ |
48900cb6 | 2991 | dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 | 2992 | if (csum) |
48900cb6 | 2993 | dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 MM |
2994 | |
2995 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
e078de03 | 2996 | dev->hw_features |= NETIF_F_TSO |
34a48579 RR |
2997 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
2998 | } | |
5539ae96 | 2999 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
3000 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
3001 | dev->hw_features |= NETIF_F_TSO; | |
3002 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
3003 | dev->hw_features |= NETIF_F_TSO6; | |
3004 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
3005 | dev->hw_features |= NETIF_F_TSO_ECN; | |
98e778c9 | 3006 | |
41f2f127 JW |
3007 | dev->features |= NETIF_F_GSO_ROBUST; |
3008 | ||
98e778c9 | 3009 | if (gso) |
e078de03 | 3010 | dev->features |= dev->hw_features & NETIF_F_ALL_TSO; |
98e778c9 | 3011 | /* (!csum && gso) case will be fixed by register_netdev() */ |
296f96fc | 3012 | } |
4f49129b TH |
3013 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
3014 | dev->features |= NETIF_F_RXCSUM; | |
a02e8964 WB |
3015 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
3016 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)) | |
3017 | dev->features |= NETIF_F_LRO; | |
cf8691cb | 3018 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) |
a02e8964 | 3019 | dev->hw_features |= NETIF_F_LRO; |
296f96fc | 3020 | |
4fda8302 JW |
3021 | dev->vlan_features = dev->features; |
3022 | ||
d0c2c997 JW |
3023 | /* MTU range: 68 - 65535 */ |
3024 | dev->min_mtu = MIN_MTU; | |
3025 | dev->max_mtu = MAX_MTU; | |
3026 | ||
296f96fc | 3027 | /* Configuration may specify what MAC to use. Otherwise random. */ |
855e0c52 RR |
3028 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
3029 | virtio_cread_bytes(vdev, | |
3030 | offsetof(struct virtio_net_config, mac), | |
3031 | dev->dev_addr, dev->addr_len); | |
3032 | else | |
f2cedb63 | 3033 | eth_hw_addr_random(dev); |
296f96fc RR |
3034 | |
3035 | /* Set up our device-specific information */ | |
3036 | vi = netdev_priv(dev); | |
296f96fc RR |
3037 | vi->dev = dev; |
3038 | vi->vdev = vdev; | |
d9d5dcc8 | 3039 | vdev->priv = vi; |
827da44c | 3040 | |
586d17c5 | 3041 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); |
296f96fc | 3042 | |
97402b96 | 3043 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
3044 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
3045 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
e3e3c423 VY |
3046 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
3047 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) | |
97402b96 HX |
3048 | vi->big_packets = true; |
3049 | ||
3f2c31d9 MM |
3050 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
3051 | vi->mergeable_rx_bufs = true; | |
3052 | ||
d04302b3 MT |
3053 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || |
3054 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
012873d0 MT |
3055 | vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
3056 | else | |
3057 | vi->hdr_len = sizeof(struct virtio_net_hdr); | |
3058 | ||
75993300 MT |
3059 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || |
3060 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
e7428e95 MT |
3061 | vi->any_header_sg = true; |
3062 | ||
986a4f4d JW |
3063 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
3064 | vi->has_cvq = true; | |
3065 | ||
14de9d11 AC |
3066 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
3067 | mtu = virtio_cread16(vdev, | |
3068 | offsetof(struct virtio_net_config, | |
3069 | mtu)); | |
93a205ee | 3070 | if (mtu < dev->min_mtu) { |
fe36cbe0 MT |
3071 | /* Should never trigger: MTU was previously validated |
3072 | * in virtnet_validate. | |
3073 | */ | |
7934b481 YS |
3074 | dev_err(&vdev->dev, |
3075 | "device MTU appears to have changed it is now %d < %d", | |
3076 | mtu, dev->min_mtu); | |
411ea23a | 3077 | err = -EINVAL; |
d7dfc5cf | 3078 | goto free; |
93a205ee | 3079 | } |
2e123b44 | 3080 | |
fe36cbe0 MT |
3081 | dev->mtu = mtu; |
3082 | dev->max_mtu = mtu; | |
3083 | ||
2e123b44 MT |
3084 | /* TODO: size buffers correctly in this case. */ |
3085 | if (dev->mtu > ETH_DATA_LEN) | |
3086 | vi->big_packets = true; | |
14de9d11 AC |
3087 | } |
3088 | ||
012873d0 MT |
3089 | if (vi->any_header_sg) |
3090 | dev->needed_headroom = vi->hdr_len; | |
6ebbc1a6 | 3091 | |
44900010 JW |
3092 | /* Enable multiqueue by default */ |
3093 | if (num_online_cpus() >= max_queue_pairs) | |
3094 | vi->curr_queue_pairs = max_queue_pairs; | |
3095 | else | |
3096 | vi->curr_queue_pairs = num_online_cpus(); | |
986a4f4d JW |
3097 | vi->max_queue_pairs = max_queue_pairs; |
3098 | ||
3099 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 3100 | err = init_vqs(vi); |
d2a7ddda | 3101 | if (err) |
d7dfc5cf | 3102 | goto free; |
296f96fc | 3103 | |
fbf28d78 MD |
3104 | #ifdef CONFIG_SYSFS |
3105 | if (vi->mergeable_rx_bufs) | |
3106 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; | |
3107 | #endif | |
0f13b66b ZYW |
3108 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
3109 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); | |
986a4f4d | 3110 | |
16032be5 NA |
3111 | virtnet_init_settings(dev); |
3112 | ||
ba5e4426 SS |
3113 | if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { |
3114 | vi->failover = net_failover_create(vi->dev); | |
4b8e6ac4 WY |
3115 | if (IS_ERR(vi->failover)) { |
3116 | err = PTR_ERR(vi->failover); | |
ba5e4426 | 3117 | goto free_vqs; |
4b8e6ac4 | 3118 | } |
ba5e4426 SS |
3119 | } |
3120 | ||
296f96fc RR |
3121 | err = register_netdev(dev); |
3122 | if (err) { | |
3123 | pr_debug("virtio_net: registering device failed\n"); | |
ba5e4426 | 3124 | goto free_failover; |
296f96fc | 3125 | } |
b3369c1f | 3126 | |
4baf1e33 MT |
3127 | virtio_device_ready(vdev); |
3128 | ||
8017c279 | 3129 | err = virtnet_cpu_notif_add(vi); |
8de4b2f3 WG |
3130 | if (err) { |
3131 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
f00e35e2 | 3132 | goto free_unregister_netdev; |
8de4b2f3 WG |
3133 | } |
3134 | ||
a220871b | 3135 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
44900010 | 3136 | |
167c25e4 JW |
3137 | /* Assume link up if device can't report link status, |
3138 | otherwise get link status from config. */ | |
bda7fab5 | 3139 | netif_carrier_off(dev); |
167c25e4 | 3140 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { |
3b07e9ca | 3141 | schedule_work(&vi->config_work); |
167c25e4 JW |
3142 | } else { |
3143 | vi->status = VIRTIO_NET_S_LINK_UP; | |
faa9b39f | 3144 | virtnet_update_settings(vi); |
167c25e4 JW |
3145 | netif_carrier_on(dev); |
3146 | } | |
9f4d26d0 | 3147 | |
3f93522f JW |
3148 | for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) |
3149 | if (virtio_has_feature(vi->vdev, guest_offloads[i])) | |
3150 | set_bit(guest_offloads[i], &vi->guest_offloads); | |
a02e8964 | 3151 | vi->guest_offloads_capable = vi->guest_offloads; |
3f93522f | 3152 | |
986a4f4d JW |
3153 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
3154 | dev->name, max_queue_pairs); | |
3155 | ||
296f96fc RR |
3156 | return 0; |
3157 | ||
f00e35e2 | 3158 | free_unregister_netdev: |
02465555 MT |
3159 | vi->vdev->config->reset(vdev); |
3160 | ||
b3369c1f | 3161 | unregister_netdev(dev); |
ba5e4426 SS |
3162 | free_failover: |
3163 | net_failover_destroy(vi->failover); | |
d2a7ddda | 3164 | free_vqs: |
986a4f4d | 3165 | cancel_delayed_work_sync(&vi->refill); |
fb51879d | 3166 | free_receive_page_frags(vi); |
e9d7417b | 3167 | virtnet_del_vqs(vi); |
296f96fc RR |
3168 | free: |
3169 | free_netdev(dev); | |
3170 | return err; | |
3171 | } | |
3172 | ||
04486ed0 | 3173 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 3174 | { |
04486ed0 | 3175 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
3176 | |
3177 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 3178 | free_unused_bufs(vi); |
fb6813f4 | 3179 | |
986a4f4d | 3180 | free_receive_bufs(vi); |
d2a7ddda | 3181 | |
fb51879d MD |
3182 | free_receive_page_frags(vi); |
3183 | ||
986a4f4d | 3184 | virtnet_del_vqs(vi); |
04486ed0 AS |
3185 | } |
3186 | ||
8cc085d6 | 3187 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
3188 | { |
3189 | struct virtnet_info *vi = vdev->priv; | |
3190 | ||
8017c279 | 3191 | virtnet_cpu_notif_remove(vi); |
8de4b2f3 | 3192 | |
102a2786 MT |
3193 | /* Make sure no work handler is accessing the device. */ |
3194 | flush_work(&vi->config_work); | |
586d17c5 | 3195 | |
04486ed0 AS |
3196 | unregister_netdev(vi->dev); |
3197 | ||
ba5e4426 SS |
3198 | net_failover_destroy(vi->failover); |
3199 | ||
04486ed0 | 3200 | remove_vq_common(vi); |
fb6813f4 | 3201 | |
74b2553f | 3202 | free_netdev(vi->dev); |
296f96fc RR |
3203 | } |
3204 | ||
67a75194 | 3205 | static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) |
0741bcb5 AS |
3206 | { |
3207 | struct virtnet_info *vi = vdev->priv; | |
3208 | ||
8017c279 | 3209 | virtnet_cpu_notif_remove(vi); |
9fe7bfce | 3210 | virtnet_freeze_down(vdev); |
0741bcb5 AS |
3211 | remove_vq_common(vi); |
3212 | ||
3213 | return 0; | |
3214 | } | |
3215 | ||
67a75194 | 3216 | static __maybe_unused int virtnet_restore(struct virtio_device *vdev) |
0741bcb5 AS |
3217 | { |
3218 | struct virtnet_info *vi = vdev->priv; | |
9fe7bfce | 3219 | int err; |
0741bcb5 | 3220 | |
9fe7bfce | 3221 | err = virtnet_restore_up(vdev); |
0741bcb5 AS |
3222 | if (err) |
3223 | return err; | |
986a4f4d JW |
3224 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
3225 | ||
8017c279 | 3226 | err = virtnet_cpu_notif_add(vi); |
ec9debbd JW |
3227 | if (err) |
3228 | return err; | |
3229 | ||
0741bcb5 AS |
3230 | return 0; |
3231 | } | |
0741bcb5 | 3232 | |
296f96fc RR |
3233 | static struct virtio_device_id id_table[] = { |
3234 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
3235 | { 0 }, | |
3236 | }; | |
3237 | ||
f3358507 MT |
3238 | #define VIRTNET_FEATURES \ |
3239 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ | |
3240 | VIRTIO_NET_F_MAC, \ | |
3241 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ | |
3242 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ | |
3243 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ | |
3244 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ | |
3245 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ | |
3246 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ | |
3247 | VIRTIO_NET_F_CTRL_MAC_ADDR, \ | |
faa9b39f | 3248 | VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ |
9805069d | 3249 | VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY |
f3358507 | 3250 | |
c45a6816 | 3251 | static unsigned int features[] = { |
f3358507 MT |
3252 | VIRTNET_FEATURES, |
3253 | }; | |
3254 | ||
3255 | static unsigned int features_legacy[] = { | |
3256 | VIRTNET_FEATURES, | |
3257 | VIRTIO_NET_F_GSO, | |
e7428e95 | 3258 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
3259 | }; |
3260 | ||
22402529 | 3261 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
3262 | .feature_table = features, |
3263 | .feature_table_size = ARRAY_SIZE(features), | |
f3358507 MT |
3264 | .feature_table_legacy = features_legacy, |
3265 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), | |
296f96fc RR |
3266 | .driver.name = KBUILD_MODNAME, |
3267 | .driver.owner = THIS_MODULE, | |
3268 | .id_table = id_table, | |
fe36cbe0 | 3269 | .validate = virtnet_validate, |
296f96fc | 3270 | .probe = virtnet_probe, |
8cc085d6 | 3271 | .remove = virtnet_remove, |
9f4d26d0 | 3272 | .config_changed = virtnet_config_changed, |
89107000 | 3273 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
3274 | .freeze = virtnet_freeze, |
3275 | .restore = virtnet_restore, | |
3276 | #endif | |
296f96fc RR |
3277 | }; |
3278 | ||
8017c279 SAS |
3279 | static __init int virtio_net_driver_init(void) |
3280 | { | |
3281 | int ret; | |
3282 | ||
73c1b41e | 3283 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", |
8017c279 SAS |
3284 | virtnet_cpu_online, |
3285 | virtnet_cpu_down_prep); | |
3286 | if (ret < 0) | |
3287 | goto out; | |
3288 | virtionet_online = ret; | |
73c1b41e | 3289 | ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", |
8017c279 SAS |
3290 | NULL, virtnet_cpu_dead); |
3291 | if (ret) | |
3292 | goto err_dead; | |
3293 | ||
3294 | ret = register_virtio_driver(&virtio_net_driver); | |
3295 | if (ret) | |
3296 | goto err_virtio; | |
3297 | return 0; | |
3298 | err_virtio: | |
3299 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); | |
3300 | err_dead: | |
3301 | cpuhp_remove_multi_state(virtionet_online); | |
3302 | out: | |
3303 | return ret; | |
3304 | } | |
3305 | module_init(virtio_net_driver_init); | |
3306 | ||
3307 | static __exit void virtio_net_driver_exit(void) | |
3308 | { | |
cfa0ebc9 | 3309 | unregister_virtio_driver(&virtio_net_driver); |
8017c279 SAS |
3310 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); |
3311 | cpuhp_remove_multi_state(virtionet_online); | |
8017c279 SAS |
3312 | } |
3313 | module_exit(virtio_net_driver_exit); | |
296f96fc RR |
3314 | |
3315 | MODULE_DEVICE_TABLE(virtio, id_table); | |
3316 | MODULE_DESCRIPTION("Virtio network driver"); | |
3317 | MODULE_LICENSE("GPL"); |