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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 | |
d7dfc5cf TM |
66 | struct virtnet_stat_desc { |
67 | char desc[ETH_GSTRING_LEN]; | |
68 | size_t offset; | |
3fa2a1df | 69 | }; |
70 | ||
d7dfc5cf TM |
71 | struct virtnet_sq_stats { |
72 | struct u64_stats_sync syncp; | |
73 | u64 packets; | |
74 | u64 bytes; | |
5b8f3c8d TM |
75 | u64 xdp_tx; |
76 | u64 xdp_tx_drops; | |
461f03dc | 77 | u64 kicks; |
d7dfc5cf TM |
78 | }; |
79 | ||
d46eeeaf JW |
80 | struct virtnet_rq_stats { |
81 | struct u64_stats_sync syncp; | |
d7dfc5cf TM |
82 | u64 packets; |
83 | u64 bytes; | |
2c4a2f7d | 84 | u64 drops; |
5b8f3c8d TM |
85 | u64 xdp_packets; |
86 | u64 xdp_tx; | |
87 | u64 xdp_redirects; | |
88 | u64 xdp_drops; | |
461f03dc | 89 | u64 kicks; |
d7dfc5cf TM |
90 | }; |
91 | ||
92 | #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m) | |
d46eeeaf | 93 | #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m) |
d7dfc5cf TM |
94 | |
95 | static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = { | |
5b8f3c8d TM |
96 | { "packets", VIRTNET_SQ_STAT(packets) }, |
97 | { "bytes", VIRTNET_SQ_STAT(bytes) }, | |
98 | { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) }, | |
99 | { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) }, | |
461f03dc | 100 | { "kicks", VIRTNET_SQ_STAT(kicks) }, |
d7dfc5cf TM |
101 | }; |
102 | ||
103 | static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = { | |
5b8f3c8d TM |
104 | { "packets", VIRTNET_RQ_STAT(packets) }, |
105 | { "bytes", VIRTNET_RQ_STAT(bytes) }, | |
106 | { "drops", VIRTNET_RQ_STAT(drops) }, | |
107 | { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) }, | |
108 | { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) }, | |
109 | { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) }, | |
110 | { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) }, | |
461f03dc | 111 | { "kicks", VIRTNET_RQ_STAT(kicks) }, |
d7dfc5cf TM |
112 | }; |
113 | ||
114 | #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc) | |
115 | #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc) | |
116 | ||
e9d7417b JW |
117 | /* Internal representation of a send virtqueue */ |
118 | struct send_queue { | |
119 | /* Virtqueue associated with this send _queue */ | |
120 | struct virtqueue *vq; | |
121 | ||
122 | /* TX: fragments + linear part + virtio header */ | |
123 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
124 | |
125 | /* Name of the send queue: output.$index */ | |
126 | char name[40]; | |
b92f1e67 | 127 | |
d7dfc5cf TM |
128 | struct virtnet_sq_stats stats; |
129 | ||
b92f1e67 | 130 | struct napi_struct napi; |
e9d7417b JW |
131 | }; |
132 | ||
133 | /* Internal representation of a receive virtqueue */ | |
134 | struct receive_queue { | |
135 | /* Virtqueue associated with this receive_queue */ | |
136 | struct virtqueue *vq; | |
137 | ||
296f96fc RR |
138 | struct napi_struct napi; |
139 | ||
f600b690 JF |
140 | struct bpf_prog __rcu *xdp_prog; |
141 | ||
d7dfc5cf TM |
142 | struct virtnet_rq_stats stats; |
143 | ||
e9d7417b JW |
144 | /* Chain pages by the private ptr. */ |
145 | struct page *pages; | |
146 | ||
ab7db917 | 147 | /* Average packet length for mergeable receive buffers. */ |
5377d758 | 148 | struct ewma_pkt_len mrg_avg_pkt_len; |
ab7db917 | 149 | |
fb51879d MD |
150 | /* Page frag for packet buffer allocation. */ |
151 | struct page_frag alloc_frag; | |
152 | ||
e9d7417b JW |
153 | /* RX: fragments + linear part + virtio header */ |
154 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d | 155 | |
d85b758f MT |
156 | /* Min single buffer size for mergeable buffers case. */ |
157 | unsigned int min_buf_len; | |
158 | ||
986a4f4d JW |
159 | /* Name of this receive queue: input.$index */ |
160 | char name[40]; | |
754b8a21 JDB |
161 | |
162 | struct xdp_rxq_info xdp_rxq; | |
e9d7417b JW |
163 | }; |
164 | ||
12e57169 MT |
165 | /* Control VQ buffers: protected by the rtnl lock */ |
166 | struct control_buf { | |
167 | struct virtio_net_ctrl_hdr hdr; | |
168 | virtio_net_ctrl_ack status; | |
169 | struct virtio_net_ctrl_mq mq; | |
170 | u8 promisc; | |
171 | u8 allmulti; | |
d7fad4c8 | 172 | __virtio16 vid; |
f4ee703a | 173 | __virtio64 offloads; |
12e57169 MT |
174 | }; |
175 | ||
e9d7417b JW |
176 | struct virtnet_info { |
177 | struct virtio_device *vdev; | |
178 | struct virtqueue *cvq; | |
179 | struct net_device *dev; | |
986a4f4d JW |
180 | struct send_queue *sq; |
181 | struct receive_queue *rq; | |
e9d7417b JW |
182 | unsigned int status; |
183 | ||
986a4f4d JW |
184 | /* Max # of queue pairs supported by the device */ |
185 | u16 max_queue_pairs; | |
186 | ||
187 | /* # of queue pairs currently used by the driver */ | |
188 | u16 curr_queue_pairs; | |
189 | ||
672aafd5 JF |
190 | /* # of XDP queue pairs currently used by the driver */ |
191 | u16 xdp_queue_pairs; | |
192 | ||
97402b96 HX |
193 | /* I like... big packets and I cannot lie! */ |
194 | bool big_packets; | |
195 | ||
3f2c31d9 MM |
196 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
197 | bool mergeable_rx_bufs; | |
198 | ||
986a4f4d JW |
199 | /* Has control virtqueue */ |
200 | bool has_cvq; | |
201 | ||
e7428e95 MT |
202 | /* Host can handle any s/g split between our header and packet data */ |
203 | bool any_header_sg; | |
204 | ||
012873d0 MT |
205 | /* Packet virtio header size */ |
206 | u8 hdr_len; | |
207 | ||
3161e453 RR |
208 | /* Work struct for refilling if we run low on memory. */ |
209 | struct delayed_work refill; | |
210 | ||
586d17c5 JW |
211 | /* Work struct for config space updates */ |
212 | struct work_struct config_work; | |
213 | ||
986a4f4d JW |
214 | /* Does the affinity hint is set for virtqueues? */ |
215 | bool affinity_hint_set; | |
47be2479 | 216 | |
8017c279 SAS |
217 | /* CPU hotplug instances for online & dead */ |
218 | struct hlist_node node; | |
219 | struct hlist_node node_dead; | |
2ac46030 | 220 | |
12e57169 | 221 | struct control_buf *ctrl; |
16032be5 NA |
222 | |
223 | /* Ethtool settings */ | |
224 | u8 duplex; | |
225 | u32 speed; | |
3f93522f JW |
226 | |
227 | unsigned long guest_offloads; | |
a02e8964 | 228 | unsigned long guest_offloads_capable; |
ba5e4426 SS |
229 | |
230 | /* failover when STANDBY feature enabled */ | |
231 | struct failover *failover; | |
296f96fc RR |
232 | }; |
233 | ||
9ab86bbc | 234 | struct padded_vnet_hdr { |
012873d0 | 235 | struct virtio_net_hdr_mrg_rxbuf hdr; |
9ab86bbc | 236 | /* |
012873d0 MT |
237 | * hdr is in a separate sg buffer, and data sg buffer shares same page |
238 | * with this header sg. This padding makes next sg 16 byte aligned | |
239 | * after the header. | |
9ab86bbc | 240 | */ |
012873d0 | 241 | char padding[4]; |
9ab86bbc SM |
242 | }; |
243 | ||
5050471d TM |
244 | static bool is_xdp_frame(void *ptr) |
245 | { | |
246 | return (unsigned long)ptr & VIRTIO_XDP_FLAG; | |
247 | } | |
248 | ||
249 | static void *xdp_to_ptr(struct xdp_frame *ptr) | |
250 | { | |
251 | return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG); | |
252 | } | |
253 | ||
254 | static struct xdp_frame *ptr_to_xdp(void *ptr) | |
255 | { | |
256 | return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG); | |
257 | } | |
258 | ||
986a4f4d JW |
259 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
260 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
261 | */ | |
262 | static int vq2txq(struct virtqueue *vq) | |
263 | { | |
9d0ca6ed | 264 | return (vq->index - 1) / 2; |
986a4f4d JW |
265 | } |
266 | ||
267 | static int txq2vq(int txq) | |
268 | { | |
269 | return txq * 2 + 1; | |
270 | } | |
271 | ||
272 | static int vq2rxq(struct virtqueue *vq) | |
273 | { | |
9d0ca6ed | 274 | return vq->index / 2; |
986a4f4d JW |
275 | } |
276 | ||
277 | static int rxq2vq(int rxq) | |
278 | { | |
279 | return rxq * 2; | |
280 | } | |
281 | ||
012873d0 | 282 | static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 283 | { |
012873d0 | 284 | return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; |
296f96fc RR |
285 | } |
286 | ||
9ab86bbc SM |
287 | /* |
288 | * private is used to chain pages for big packets, put the whole | |
289 | * most recent used list in the beginning for reuse | |
290 | */ | |
e9d7417b | 291 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 292 | { |
9ab86bbc | 293 | struct page *end; |
0a888fd1 | 294 | |
e9d7417b | 295 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 296 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
297 | end->private = (unsigned long)rq->pages; |
298 | rq->pages = page; | |
0a888fd1 MM |
299 | } |
300 | ||
e9d7417b | 301 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 302 | { |
e9d7417b | 303 | struct page *p = rq->pages; |
fb6813f4 | 304 | |
9ab86bbc | 305 | if (p) { |
e9d7417b | 306 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
307 | /* clear private here, it is used to chain pages */ |
308 | p->private = 0; | |
309 | } else | |
fb6813f4 RR |
310 | p = alloc_page(gfp_mask); |
311 | return p; | |
312 | } | |
313 | ||
e4e8452a WB |
314 | static void virtqueue_napi_schedule(struct napi_struct *napi, |
315 | struct virtqueue *vq) | |
316 | { | |
317 | if (napi_schedule_prep(napi)) { | |
318 | virtqueue_disable_cb(vq); | |
319 | __napi_schedule(napi); | |
320 | } | |
321 | } | |
322 | ||
323 | static void virtqueue_napi_complete(struct napi_struct *napi, | |
324 | struct virtqueue *vq, int processed) | |
325 | { | |
326 | int opaque; | |
327 | ||
328 | opaque = virtqueue_enable_cb_prepare(vq); | |
fdaa767a TM |
329 | if (napi_complete_done(napi, processed)) { |
330 | if (unlikely(virtqueue_poll(vq, opaque))) | |
331 | virtqueue_napi_schedule(napi, vq); | |
332 | } else { | |
333 | virtqueue_disable_cb(vq); | |
334 | } | |
e4e8452a WB |
335 | } |
336 | ||
e9d7417b | 337 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 338 | { |
e9d7417b | 339 | struct virtnet_info *vi = vq->vdev->priv; |
b92f1e67 | 340 | struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; |
296f96fc | 341 | |
2cb9c6ba | 342 | /* Suppress further interrupts. */ |
e9d7417b | 343 | virtqueue_disable_cb(vq); |
11a3a154 | 344 | |
b92f1e67 WB |
345 | if (napi->weight) |
346 | virtqueue_napi_schedule(napi, vq); | |
347 | else | |
348 | /* We were probably waiting for more output buffers. */ | |
349 | netif_wake_subqueue(vi->dev, vq2txq(vq)); | |
296f96fc RR |
350 | } |
351 | ||
28b39bc7 JW |
352 | #define MRG_CTX_HEADER_SHIFT 22 |
353 | static void *mergeable_len_to_ctx(unsigned int truesize, | |
354 | unsigned int headroom) | |
355 | { | |
356 | return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize); | |
357 | } | |
358 | ||
359 | static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx) | |
360 | { | |
361 | return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT; | |
362 | } | |
363 | ||
364 | static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx) | |
365 | { | |
366 | return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1); | |
367 | } | |
368 | ||
3464645a | 369 | /* Called from bottom half context */ |
946fa564 MT |
370 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
371 | struct receive_queue *rq, | |
2613af0e | 372 | struct page *page, unsigned int offset, |
436c9453 | 373 | unsigned int len, unsigned int truesize, |
503d539a | 374 | bool hdr_valid, unsigned int metasize) |
9ab86bbc SM |
375 | { |
376 | struct sk_buff *skb; | |
012873d0 | 377 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
2613af0e | 378 | unsigned int copy, hdr_len, hdr_padded_len; |
9ab86bbc | 379 | char *p; |
fb6813f4 | 380 | |
2613af0e | 381 | p = page_address(page) + offset; |
3f2c31d9 | 382 | |
9ab86bbc | 383 | /* copy small packet so we can reuse these pages for small data */ |
c67f5db8 | 384 | skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); |
9ab86bbc SM |
385 | if (unlikely(!skb)) |
386 | return NULL; | |
3f2c31d9 | 387 | |
9ab86bbc | 388 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 389 | |
012873d0 MT |
390 | hdr_len = vi->hdr_len; |
391 | if (vi->mergeable_rx_bufs) | |
a4a76503 | 392 | hdr_padded_len = sizeof(*hdr); |
012873d0 | 393 | else |
2613af0e | 394 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
3f2c31d9 | 395 | |
503d539a | 396 | /* hdr_valid means no XDP, so we can copy the vnet header */ |
436c9453 JW |
397 | if (hdr_valid) |
398 | memcpy(hdr, p, hdr_len); | |
3f2c31d9 | 399 | |
9ab86bbc | 400 | len -= hdr_len; |
2613af0e MD |
401 | offset += hdr_padded_len; |
402 | p += hdr_padded_len; | |
3f2c31d9 | 403 | |
9ab86bbc SM |
404 | copy = len; |
405 | if (copy > skb_tailroom(skb)) | |
406 | copy = skb_tailroom(skb); | |
59ae1d12 | 407 | skb_put_data(skb, p, copy); |
3f2c31d9 | 408 | |
503d539a YK |
409 | if (metasize) { |
410 | __skb_pull(skb, metasize); | |
411 | skb_metadata_set(skb, metasize); | |
412 | } | |
413 | ||
9ab86bbc SM |
414 | len -= copy; |
415 | offset += copy; | |
3f2c31d9 | 416 | |
2613af0e MD |
417 | if (vi->mergeable_rx_bufs) { |
418 | if (len) | |
419 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); | |
420 | else | |
421 | put_page(page); | |
422 | return skb; | |
423 | } | |
424 | ||
e878d78b SL |
425 | /* |
426 | * Verify that we can indeed put this data into a skb. | |
427 | * This is here to handle cases when the device erroneously | |
428 | * tries to receive more than is possible. This is usually | |
429 | * the case of a broken device. | |
430 | */ | |
431 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 432 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
433 | dev_kfree_skb(skb); |
434 | return NULL; | |
435 | } | |
2613af0e | 436 | BUG_ON(offset >= PAGE_SIZE); |
9ab86bbc | 437 | while (len) { |
2613af0e MD |
438 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
439 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, | |
440 | frag_size, truesize); | |
441 | len -= frag_size; | |
9ab86bbc SM |
442 | page = (struct page *)page->private; |
443 | offset = 0; | |
444 | } | |
3f2c31d9 | 445 | |
9ab86bbc | 446 | if (page) |
e9d7417b | 447 | give_pages(rq, page); |
3f2c31d9 | 448 | |
9ab86bbc SM |
449 | return skb; |
450 | } | |
3f2c31d9 | 451 | |
735fc405 JDB |
452 | static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, |
453 | struct send_queue *sq, | |
454 | struct xdp_frame *xdpf) | |
56434a01 | 455 | { |
56434a01 | 456 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
56434a01 JF |
457 | int err; |
458 | ||
cac320c8 JDB |
459 | if (unlikely(xdpf->headroom < vi->hdr_len)) |
460 | return -EOVERFLOW; | |
461 | ||
462 | /* Make room for virtqueue hdr (also change xdpf->headroom?) */ | |
463 | xdpf->data -= vi->hdr_len; | |
f6b10209 | 464 | /* Zero header and leave csum up to XDP layers */ |
cac320c8 | 465 | hdr = xdpf->data; |
f6b10209 | 466 | memset(hdr, 0, vi->hdr_len); |
cac320c8 | 467 | xdpf->len += vi->hdr_len; |
bb91accf | 468 | |
cac320c8 | 469 | sg_init_one(sq->sg, xdpf->data, xdpf->len); |
bb91accf | 470 | |
5050471d TM |
471 | err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp_to_ptr(xdpf), |
472 | GFP_ATOMIC); | |
11b7d897 | 473 | if (unlikely(err)) |
cac320c8 | 474 | return -ENOSPC; /* Caller handle free/refcnt */ |
56434a01 | 475 | |
cac320c8 | 476 | return 0; |
56434a01 JF |
477 | } |
478 | ||
2a43565c TM |
479 | static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi) |
480 | { | |
481 | unsigned int qp; | |
482 | ||
483 | qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); | |
484 | return &vi->sq[qp]; | |
485 | } | |
486 | ||
735fc405 | 487 | static int virtnet_xdp_xmit(struct net_device *dev, |
42b33468 | 488 | int n, struct xdp_frame **frames, u32 flags) |
186b3c99 JW |
489 | { |
490 | struct virtnet_info *vi = netdev_priv(dev); | |
8dcc5b0a JDB |
491 | struct receive_queue *rq = vi->rq; |
492 | struct bpf_prog *xdp_prog; | |
735fc405 JDB |
493 | struct send_queue *sq; |
494 | unsigned int len; | |
546f2897 TM |
495 | int packets = 0; |
496 | int bytes = 0; | |
735fc405 | 497 | int drops = 0; |
461f03dc | 498 | int kicks = 0; |
5b8f3c8d | 499 | int ret, err; |
5050471d | 500 | void *ptr; |
735fc405 JDB |
501 | int i; |
502 | ||
8dcc5b0a JDB |
503 | /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this |
504 | * indicate XDP resources have been successfully allocated. | |
505 | */ | |
9719c6b9 | 506 | xdp_prog = rcu_access_pointer(rq->xdp_prog); |
1667c08a TM |
507 | if (!xdp_prog) |
508 | return -ENXIO; | |
509 | ||
510 | sq = virtnet_xdp_sq(vi); | |
511 | ||
512 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { | |
513 | ret = -EINVAL; | |
5b8f3c8d TM |
514 | drops = n; |
515 | goto out; | |
516 | } | |
8dcc5b0a | 517 | |
735fc405 | 518 | /* Free up any pending old buffers before queueing new ones. */ |
5050471d | 519 | while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
546f2897 TM |
520 | if (likely(is_xdp_frame(ptr))) { |
521 | struct xdp_frame *frame = ptr_to_xdp(ptr); | |
522 | ||
523 | bytes += frame->len; | |
524 | xdp_return_frame(frame); | |
525 | } else { | |
526 | struct sk_buff *skb = ptr; | |
527 | ||
528 | bytes += skb->len; | |
529 | napi_consume_skb(skb, false); | |
530 | } | |
531 | packets++; | |
5050471d | 532 | } |
735fc405 JDB |
533 | |
534 | for (i = 0; i < n; i++) { | |
535 | struct xdp_frame *xdpf = frames[i]; | |
536 | ||
537 | err = __virtnet_xdp_xmit_one(vi, sq, xdpf); | |
538 | if (err) { | |
539 | xdp_return_frame_rx_napi(xdpf); | |
540 | drops++; | |
541 | } | |
542 | } | |
5b8f3c8d | 543 | ret = n - drops; |
5d274cb4 | 544 | |
461f03dc TM |
545 | if (flags & XDP_XMIT_FLUSH) { |
546 | if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) | |
547 | kicks = 1; | |
548 | } | |
5b8f3c8d TM |
549 | out: |
550 | u64_stats_update_begin(&sq->stats.syncp); | |
546f2897 TM |
551 | sq->stats.bytes += bytes; |
552 | sq->stats.packets += packets; | |
5b8f3c8d TM |
553 | sq->stats.xdp_tx += n; |
554 | sq->stats.xdp_tx_drops += drops; | |
461f03dc | 555 | sq->stats.kicks += kicks; |
5b8f3c8d | 556 | u64_stats_update_end(&sq->stats.syncp); |
5d274cb4 | 557 | |
5b8f3c8d | 558 | return ret; |
186b3c99 JW |
559 | } |
560 | ||
f6b10209 JW |
561 | static unsigned int virtnet_get_headroom(struct virtnet_info *vi) |
562 | { | |
563 | return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0; | |
564 | } | |
565 | ||
4941d472 JW |
566 | /* We copy the packet for XDP in the following cases: |
567 | * | |
568 | * 1) Packet is scattered across multiple rx buffers. | |
569 | * 2) Headroom space is insufficient. | |
570 | * | |
571 | * This is inefficient but it's a temporary condition that | |
572 | * we hit right after XDP is enabled and until queue is refilled | |
573 | * with large buffers with sufficient headroom - so it should affect | |
574 | * at most queue size packets. | |
575 | * Afterwards, the conditions to enable | |
576 | * XDP should preclude the underlying device from sending packets | |
577 | * across multiple buffers (num_buf > 1), and we make sure buffers | |
578 | * have enough headroom. | |
579 | */ | |
580 | static struct page *xdp_linearize_page(struct receive_queue *rq, | |
581 | u16 *num_buf, | |
582 | struct page *p, | |
583 | int offset, | |
584 | int page_off, | |
585 | unsigned int *len) | |
586 | { | |
587 | struct page *page = alloc_page(GFP_ATOMIC); | |
588 | ||
589 | if (!page) | |
590 | return NULL; | |
591 | ||
592 | memcpy(page_address(page) + page_off, page_address(p) + offset, *len); | |
593 | page_off += *len; | |
594 | ||
595 | while (--*num_buf) { | |
3cc81a9a | 596 | int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
4941d472 JW |
597 | unsigned int buflen; |
598 | void *buf; | |
599 | int off; | |
600 | ||
601 | buf = virtqueue_get_buf(rq->vq, &buflen); | |
602 | if (unlikely(!buf)) | |
603 | goto err_buf; | |
604 | ||
605 | p = virt_to_head_page(buf); | |
606 | off = buf - page_address(p); | |
607 | ||
608 | /* guard against a misconfigured or uncooperative backend that | |
609 | * is sending packet larger than the MTU. | |
610 | */ | |
3cc81a9a | 611 | if ((page_off + buflen + tailroom) > PAGE_SIZE) { |
4941d472 JW |
612 | put_page(p); |
613 | goto err_buf; | |
614 | } | |
615 | ||
616 | memcpy(page_address(page) + page_off, | |
617 | page_address(p) + off, buflen); | |
618 | page_off += buflen; | |
619 | put_page(p); | |
620 | } | |
621 | ||
622 | /* Headroom does not contribute to packet length */ | |
623 | *len = page_off - VIRTIO_XDP_HEADROOM; | |
624 | return page; | |
625 | err_buf: | |
626 | __free_pages(page, 0); | |
627 | return NULL; | |
628 | } | |
629 | ||
bb91accf JW |
630 | static struct sk_buff *receive_small(struct net_device *dev, |
631 | struct virtnet_info *vi, | |
632 | struct receive_queue *rq, | |
192f68cf | 633 | void *buf, void *ctx, |
186b3c99 | 634 | unsigned int len, |
7d9d60fd | 635 | unsigned int *xdp_xmit, |
d46eeeaf | 636 | struct virtnet_rq_stats *stats) |
f121159d | 637 | { |
f6b10209 | 638 | struct sk_buff *skb; |
bb91accf | 639 | struct bpf_prog *xdp_prog; |
4941d472 | 640 | unsigned int xdp_headroom = (unsigned long)ctx; |
f6b10209 JW |
641 | unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; |
642 | unsigned int headroom = vi->hdr_len + header_offset; | |
643 | unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + | |
644 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
4941d472 | 645 | struct page *page = virt_to_head_page(buf); |
11b7d897 | 646 | unsigned int delta = 0; |
4941d472 | 647 | struct page *xdp_page; |
11b7d897 | 648 | int err; |
503d539a | 649 | unsigned int metasize = 0; |
11b7d897 | 650 | |
012873d0 | 651 | len -= vi->hdr_len; |
d46eeeaf | 652 | stats->bytes += len; |
f121159d | 653 | |
bb91accf JW |
654 | rcu_read_lock(); |
655 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
656 | if (xdp_prog) { | |
f6b10209 | 657 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; |
44fa2dbd | 658 | struct xdp_frame *xdpf; |
0354e4d1 | 659 | struct xdp_buff xdp; |
f6b10209 | 660 | void *orig_data; |
bb91accf JW |
661 | u32 act; |
662 | ||
95dbe9e7 | 663 | if (unlikely(hdr->hdr.gso_type)) |
bb91accf | 664 | goto err_xdp; |
0354e4d1 | 665 | |
4941d472 JW |
666 | if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { |
667 | int offset = buf - page_address(page) + header_offset; | |
668 | unsigned int tlen = len + vi->hdr_len; | |
669 | u16 num_buf = 1; | |
670 | ||
671 | xdp_headroom = virtnet_get_headroom(vi); | |
672 | header_offset = VIRTNET_RX_PAD + xdp_headroom; | |
673 | headroom = vi->hdr_len + header_offset; | |
674 | buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + | |
675 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
676 | xdp_page = xdp_linearize_page(rq, &num_buf, page, | |
677 | offset, header_offset, | |
678 | &tlen); | |
679 | if (!xdp_page) | |
680 | goto err_xdp; | |
681 | ||
682 | buf = page_address(xdp_page); | |
683 | put_page(page); | |
684 | page = xdp_page; | |
685 | } | |
686 | ||
f6b10209 JW |
687 | xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len; |
688 | xdp.data = xdp.data_hard_start + xdp_headroom; | |
0354e4d1 | 689 | xdp.data_end = xdp.data + len; |
503d539a | 690 | xdp.data_meta = xdp.data; |
754b8a21 | 691 | xdp.rxq = &rq->xdp_rxq; |
f6b10209 | 692 | orig_data = xdp.data; |
0354e4d1 | 693 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
d46eeeaf | 694 | stats->xdp_packets++; |
0354e4d1 | 695 | |
bb91accf JW |
696 | switch (act) { |
697 | case XDP_PASS: | |
2de2f7f4 | 698 | /* Recalculate length in case bpf program changed it */ |
f6b10209 | 699 | delta = orig_data - xdp.data; |
6870de43 | 700 | len = xdp.data_end - xdp.data; |
503d539a | 701 | metasize = xdp.data - xdp.data_meta; |
bb91accf JW |
702 | break; |
703 | case XDP_TX: | |
d46eeeaf | 704 | stats->xdp_tx++; |
44fa2dbd JDB |
705 | xdpf = convert_to_xdp_frame(&xdp); |
706 | if (unlikely(!xdpf)) | |
707 | goto err_xdp; | |
ca9e83b4 JW |
708 | err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); |
709 | if (unlikely(err < 0)) { | |
0354e4d1 | 710 | trace_xdp_exception(vi->dev, xdp_prog, act); |
11b7d897 JDB |
711 | goto err_xdp; |
712 | } | |
2471c75e | 713 | *xdp_xmit |= VIRTIO_XDP_TX; |
186b3c99 JW |
714 | rcu_read_unlock(); |
715 | goto xdp_xmit; | |
716 | case XDP_REDIRECT: | |
d46eeeaf | 717 | stats->xdp_redirects++; |
186b3c99 | 718 | err = xdp_do_redirect(dev, &xdp, xdp_prog); |
11b7d897 JDB |
719 | if (err) |
720 | goto err_xdp; | |
2471c75e | 721 | *xdp_xmit |= VIRTIO_XDP_REDIR; |
bb91accf JW |
722 | rcu_read_unlock(); |
723 | goto xdp_xmit; | |
bb91accf | 724 | default: |
0354e4d1 | 725 | bpf_warn_invalid_xdp_action(act); |
b633d440 | 726 | /* fall through */ |
0354e4d1 JF |
727 | case XDP_ABORTED: |
728 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
729 | case XDP_DROP: | |
bb91accf JW |
730 | goto err_xdp; |
731 | } | |
732 | } | |
733 | rcu_read_unlock(); | |
734 | ||
f6b10209 JW |
735 | skb = build_skb(buf, buflen); |
736 | if (!skb) { | |
4941d472 | 737 | put_page(page); |
f6b10209 JW |
738 | goto err; |
739 | } | |
740 | skb_reserve(skb, headroom - delta); | |
6870de43 | 741 | skb_put(skb, len); |
f1d4884d | 742 | if (!xdp_prog) { |
f6b10209 JW |
743 | buf += header_offset; |
744 | memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); | |
f1d4884d | 745 | } /* keep zeroed vnet hdr since XDP is loaded */ |
f6b10209 | 746 | |
503d539a YK |
747 | if (metasize) |
748 | skb_metadata_set(skb, metasize); | |
749 | ||
f6b10209 | 750 | err: |
f121159d | 751 | return skb; |
bb91accf JW |
752 | |
753 | err_xdp: | |
754 | rcu_read_unlock(); | |
d46eeeaf JW |
755 | stats->xdp_drops++; |
756 | stats->drops++; | |
4941d472 | 757 | put_page(page); |
bb91accf JW |
758 | xdp_xmit: |
759 | return NULL; | |
f121159d MT |
760 | } |
761 | ||
762 | static struct sk_buff *receive_big(struct net_device *dev, | |
946fa564 | 763 | struct virtnet_info *vi, |
f121159d MT |
764 | struct receive_queue *rq, |
765 | void *buf, | |
7d9d60fd | 766 | unsigned int len, |
d46eeeaf | 767 | struct virtnet_rq_stats *stats) |
f121159d MT |
768 | { |
769 | struct page *page = buf; | |
503d539a YK |
770 | struct sk_buff *skb = |
771 | page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, true, 0); | |
f600b690 | 772 | |
d46eeeaf | 773 | stats->bytes += len - vi->hdr_len; |
f121159d MT |
774 | if (unlikely(!skb)) |
775 | goto err; | |
776 | ||
777 | return skb; | |
778 | ||
779 | err: | |
d46eeeaf | 780 | stats->drops++; |
f121159d MT |
781 | give_pages(rq, page); |
782 | return NULL; | |
783 | } | |
784 | ||
8fc3b9e9 | 785 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
fdd819b2 | 786 | struct virtnet_info *vi, |
8fc3b9e9 | 787 | struct receive_queue *rq, |
680557cf MT |
788 | void *buf, |
789 | void *ctx, | |
186b3c99 | 790 | unsigned int len, |
7d9d60fd | 791 | unsigned int *xdp_xmit, |
d46eeeaf | 792 | struct virtnet_rq_stats *stats) |
9ab86bbc | 793 | { |
012873d0 MT |
794 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; |
795 | u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); | |
8fc3b9e9 MT |
796 | struct page *page = virt_to_head_page(buf); |
797 | int offset = buf - page_address(page); | |
f600b690 JF |
798 | struct sk_buff *head_skb, *curr_skb; |
799 | struct bpf_prog *xdp_prog; | |
800 | unsigned int truesize; | |
4941d472 | 801 | unsigned int headroom = mergeable_ctx_to_headroom(ctx); |
3cc81a9a | 802 | int err; |
503d539a | 803 | unsigned int metasize = 0; |
f600b690 | 804 | |
56434a01 | 805 | head_skb = NULL; |
d46eeeaf | 806 | stats->bytes += len - vi->hdr_len; |
56434a01 | 807 | |
f600b690 JF |
808 | rcu_read_lock(); |
809 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
810 | if (xdp_prog) { | |
44fa2dbd | 811 | struct xdp_frame *xdpf; |
72979a6c | 812 | struct page *xdp_page; |
0354e4d1 | 813 | struct xdp_buff xdp; |
0354e4d1 | 814 | void *data; |
f600b690 JF |
815 | u32 act; |
816 | ||
3d62b2a0 JW |
817 | /* Transient failure which in theory could occur if |
818 | * in-flight packets from before XDP was enabled reach | |
819 | * the receive path after XDP is loaded. | |
820 | */ | |
821 | if (unlikely(hdr->hdr.gso_type)) | |
822 | goto err_xdp; | |
823 | ||
3cc81a9a JW |
824 | /* This happens when rx buffer size is underestimated |
825 | * or headroom is not enough because of the buffer | |
826 | * was refilled before XDP is set. This should only | |
827 | * happen for the first several packets, so we don't | |
828 | * care much about its performance. | |
829 | */ | |
4941d472 JW |
830 | if (unlikely(num_buf > 1 || |
831 | headroom < virtnet_get_headroom(vi))) { | |
72979a6c | 832 | /* linearize data for XDP */ |
56a86f84 | 833 | xdp_page = xdp_linearize_page(rq, &num_buf, |
4941d472 JW |
834 | page, offset, |
835 | VIRTIO_XDP_HEADROOM, | |
836 | &len); | |
72979a6c JF |
837 | if (!xdp_page) |
838 | goto err_xdp; | |
2de2f7f4 | 839 | offset = VIRTIO_XDP_HEADROOM; |
72979a6c JF |
840 | } else { |
841 | xdp_page = page; | |
f600b690 JF |
842 | } |
843 | ||
2de2f7f4 JF |
844 | /* Allow consuming headroom but reserve enough space to push |
845 | * the descriptor on if we get an XDP_TX return code. | |
846 | */ | |
0354e4d1 | 847 | data = page_address(xdp_page) + offset; |
2de2f7f4 | 848 | xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len; |
0354e4d1 JF |
849 | xdp.data = data + vi->hdr_len; |
850 | xdp.data_end = xdp.data + (len - vi->hdr_len); | |
503d539a | 851 | xdp.data_meta = xdp.data; |
754b8a21 JDB |
852 | xdp.rxq = &rq->xdp_rxq; |
853 | ||
0354e4d1 | 854 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
d46eeeaf | 855 | stats->xdp_packets++; |
0354e4d1 | 856 | |
56434a01 JF |
857 | switch (act) { |
858 | case XDP_PASS: | |
503d539a YK |
859 | metasize = xdp.data - xdp.data_meta; |
860 | ||
2de2f7f4 | 861 | /* recalculate offset to account for any header |
503d539a YK |
862 | * adjustments and minus the metasize to copy the |
863 | * metadata in page_to_skb(). Note other cases do not | |
864 | * build an skb and avoid using offset | |
2de2f7f4 | 865 | */ |
503d539a YK |
866 | offset = xdp.data - page_address(xdp_page) - |
867 | vi->hdr_len - metasize; | |
2de2f7f4 | 868 | |
503d539a YK |
869 | /* recalculate len if xdp.data, xdp.data_end or |
870 | * xdp.data_meta were adjusted | |
6870de43 | 871 | */ |
503d539a | 872 | len = xdp.data_end - xdp.data + vi->hdr_len + metasize; |
1830f893 JW |
873 | /* We can only create skb based on xdp_page. */ |
874 | if (unlikely(xdp_page != page)) { | |
875 | rcu_read_unlock(); | |
876 | put_page(page); | |
503d539a YK |
877 | head_skb = page_to_skb(vi, rq, xdp_page, offset, |
878 | len, PAGE_SIZE, false, | |
879 | metasize); | |
1830f893 JW |
880 | return head_skb; |
881 | } | |
56434a01 JF |
882 | break; |
883 | case XDP_TX: | |
d46eeeaf | 884 | stats->xdp_tx++; |
44fa2dbd JDB |
885 | xdpf = convert_to_xdp_frame(&xdp); |
886 | if (unlikely(!xdpf)) | |
887 | goto err_xdp; | |
ca9e83b4 JW |
888 | err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); |
889 | if (unlikely(err < 0)) { | |
0354e4d1 | 890 | trace_xdp_exception(vi->dev, xdp_prog, act); |
11b7d897 JDB |
891 | if (unlikely(xdp_page != page)) |
892 | put_page(xdp_page); | |
893 | goto err_xdp; | |
894 | } | |
2471c75e | 895 | *xdp_xmit |= VIRTIO_XDP_TX; |
72979a6c | 896 | if (unlikely(xdp_page != page)) |
5d458a13 | 897 | put_page(page); |
56434a01 JF |
898 | rcu_read_unlock(); |
899 | goto xdp_xmit; | |
3cc81a9a | 900 | case XDP_REDIRECT: |
d46eeeaf | 901 | stats->xdp_redirects++; |
3cc81a9a JW |
902 | err = xdp_do_redirect(dev, &xdp, xdp_prog); |
903 | if (err) { | |
904 | if (unlikely(xdp_page != page)) | |
905 | put_page(xdp_page); | |
906 | goto err_xdp; | |
907 | } | |
2471c75e | 908 | *xdp_xmit |= VIRTIO_XDP_REDIR; |
3cc81a9a | 909 | if (unlikely(xdp_page != page)) |
6890418b | 910 | put_page(page); |
3cc81a9a JW |
911 | rcu_read_unlock(); |
912 | goto xdp_xmit; | |
56434a01 | 913 | default: |
0354e4d1 | 914 | bpf_warn_invalid_xdp_action(act); |
b633d440 | 915 | /* fall through */ |
0354e4d1 JF |
916 | case XDP_ABORTED: |
917 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
b633d440 | 918 | /* fall through */ |
0354e4d1 | 919 | case XDP_DROP: |
72979a6c JF |
920 | if (unlikely(xdp_page != page)) |
921 | __free_pages(xdp_page, 0); | |
f600b690 | 922 | goto err_xdp; |
56434a01 | 923 | } |
f600b690 JF |
924 | } |
925 | rcu_read_unlock(); | |
ab7db917 | 926 | |
28b39bc7 JW |
927 | truesize = mergeable_ctx_to_truesize(ctx); |
928 | if (unlikely(len > truesize)) { | |
56da5fd0 | 929 | pr_debug("%s: rx error: len %u exceeds truesize %lu\n", |
680557cf MT |
930 | dev->name, len, (unsigned long)ctx); |
931 | dev->stats.rx_length_errors++; | |
932 | goto err_skb; | |
933 | } | |
28b39bc7 | 934 | |
503d539a YK |
935 | head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog, |
936 | metasize); | |
f600b690 | 937 | curr_skb = head_skb; |
9ab86bbc | 938 | |
8fc3b9e9 MT |
939 | if (unlikely(!curr_skb)) |
940 | goto err_skb; | |
9ab86bbc | 941 | while (--num_buf) { |
8fc3b9e9 MT |
942 | int num_skb_frags; |
943 | ||
680557cf | 944 | buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); |
03e9f8a0 | 945 | if (unlikely(!buf)) { |
8fc3b9e9 | 946 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
fdd819b2 | 947 | dev->name, num_buf, |
012873d0 MT |
948 | virtio16_to_cpu(vi->vdev, |
949 | hdr->num_buffers)); | |
8fc3b9e9 MT |
950 | dev->stats.rx_length_errors++; |
951 | goto err_buf; | |
3f2c31d9 | 952 | } |
8fc3b9e9 | 953 | |
d46eeeaf | 954 | stats->bytes += len; |
8fc3b9e9 | 955 | page = virt_to_head_page(buf); |
28b39bc7 JW |
956 | |
957 | truesize = mergeable_ctx_to_truesize(ctx); | |
958 | if (unlikely(len > truesize)) { | |
56da5fd0 | 959 | pr_debug("%s: rx error: len %u exceeds truesize %lu\n", |
680557cf MT |
960 | dev->name, len, (unsigned long)ctx); |
961 | dev->stats.rx_length_errors++; | |
962 | goto err_skb; | |
963 | } | |
8fc3b9e9 MT |
964 | |
965 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; | |
2613af0e MD |
966 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
967 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
8fc3b9e9 MT |
968 | |
969 | if (unlikely(!nskb)) | |
970 | goto err_skb; | |
2613af0e MD |
971 | if (curr_skb == head_skb) |
972 | skb_shinfo(curr_skb)->frag_list = nskb; | |
973 | else | |
974 | curr_skb->next = nskb; | |
975 | curr_skb = nskb; | |
976 | head_skb->truesize += nskb->truesize; | |
977 | num_skb_frags = 0; | |
978 | } | |
979 | if (curr_skb != head_skb) { | |
980 | head_skb->data_len += len; | |
981 | head_skb->len += len; | |
fb51879d | 982 | head_skb->truesize += truesize; |
2613af0e | 983 | } |
8fc3b9e9 | 984 | offset = buf - page_address(page); |
ba275241 JW |
985 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
986 | put_page(page); | |
987 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
fb51879d | 988 | len, truesize); |
ba275241 JW |
989 | } else { |
990 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
fb51879d | 991 | offset, len, truesize); |
ba275241 | 992 | } |
8fc3b9e9 MT |
993 | } |
994 | ||
5377d758 | 995 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); |
8fc3b9e9 MT |
996 | return head_skb; |
997 | ||
f600b690 JF |
998 | err_xdp: |
999 | rcu_read_unlock(); | |
d46eeeaf | 1000 | stats->xdp_drops++; |
8fc3b9e9 MT |
1001 | err_skb: |
1002 | put_page(page); | |
850e088d | 1003 | while (num_buf-- > 1) { |
680557cf MT |
1004 | buf = virtqueue_get_buf(rq->vq, &len); |
1005 | if (unlikely(!buf)) { | |
8fc3b9e9 MT |
1006 | pr_debug("%s: rx error: %d buffers missing\n", |
1007 | dev->name, num_buf); | |
1008 | dev->stats.rx_length_errors++; | |
1009 | break; | |
1010 | } | |
d46eeeaf | 1011 | stats->bytes += len; |
680557cf | 1012 | page = virt_to_head_page(buf); |
8fc3b9e9 | 1013 | put_page(page); |
9ab86bbc | 1014 | } |
8fc3b9e9 | 1015 | err_buf: |
d46eeeaf | 1016 | stats->drops++; |
8fc3b9e9 | 1017 | dev_kfree_skb(head_skb); |
56434a01 | 1018 | xdp_xmit: |
8fc3b9e9 | 1019 | return NULL; |
9ab86bbc SM |
1020 | } |
1021 | ||
7d9d60fd TM |
1022 | static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
1023 | void *buf, unsigned int len, void **ctx, | |
a0929a44 | 1024 | unsigned int *xdp_xmit, |
d46eeeaf | 1025 | struct virtnet_rq_stats *stats) |
9ab86bbc | 1026 | { |
e9d7417b | 1027 | struct net_device *dev = vi->dev; |
9ab86bbc | 1028 | struct sk_buff *skb; |
012873d0 | 1029 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
3f2c31d9 | 1030 | |
bcff3162 | 1031 | if (unlikely(len < vi->hdr_len + ETH_HLEN)) { |
9ab86bbc SM |
1032 | pr_debug("%s: short packet %i\n", dev->name, len); |
1033 | dev->stats.rx_length_errors++; | |
ab7db917 | 1034 | if (vi->mergeable_rx_bufs) { |
680557cf | 1035 | put_page(virt_to_head_page(buf)); |
ab7db917 | 1036 | } else if (vi->big_packets) { |
98bfd23c | 1037 | give_pages(rq, buf); |
ab7db917 | 1038 | } else { |
f6b10209 | 1039 | put_page(virt_to_head_page(buf)); |
ab7db917 | 1040 | } |
7d9d60fd | 1041 | return; |
9ab86bbc | 1042 | } |
3f2c31d9 | 1043 | |
f121159d | 1044 | if (vi->mergeable_rx_bufs) |
7d9d60fd | 1045 | skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, |
a0929a44 | 1046 | stats); |
f121159d | 1047 | else if (vi->big_packets) |
a0929a44 | 1048 | skb = receive_big(dev, vi, rq, buf, len, stats); |
f121159d | 1049 | else |
a0929a44 | 1050 | skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); |
f121159d MT |
1051 | |
1052 | if (unlikely(!skb)) | |
7d9d60fd | 1053 | return; |
3f2c31d9 | 1054 | |
9ab86bbc | 1055 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 1056 | |
e858fae2 | 1057 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) |
10a8d94a | 1058 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
296f96fc | 1059 | |
e858fae2 MR |
1060 | if (virtio_net_hdr_to_skb(skb, &hdr->hdr, |
1061 | virtio_is_little_endian(vi->vdev))) { | |
1062 | net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", | |
1063 | dev->name, hdr->hdr.gso_type, | |
1064 | hdr->hdr.gso_size); | |
1065 | goto frame_err; | |
296f96fc RR |
1066 | } |
1067 | ||
133bbb18 | 1068 | skb_record_rx_queue(skb, vq2rxq(rq->vq)); |
d1dc06dc MR |
1069 | skb->protocol = eth_type_trans(skb, dev); |
1070 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
1071 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
1072 | ||
0fbd050a | 1073 | napi_gro_receive(&rq->napi, skb); |
7d9d60fd | 1074 | return; |
296f96fc RR |
1075 | |
1076 | frame_err: | |
1077 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
1078 | dev_kfree_skb(skb); |
1079 | } | |
1080 | ||
192f68cf JW |
1081 | /* Unlike mergeable buffers, all buffers are allocated to the |
1082 | * same size, except for the headroom. For this reason we do | |
1083 | * not need to use mergeable_len_to_ctx here - it is enough | |
1084 | * to store the headroom as the context ignoring the truesize. | |
1085 | */ | |
946fa564 MT |
1086 | static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
1087 | gfp_t gfp) | |
296f96fc | 1088 | { |
f6b10209 JW |
1089 | struct page_frag *alloc_frag = &rq->alloc_frag; |
1090 | char *buf; | |
2de2f7f4 | 1091 | unsigned int xdp_headroom = virtnet_get_headroom(vi); |
192f68cf | 1092 | void *ctx = (void *)(unsigned long)xdp_headroom; |
f6b10209 | 1093 | int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; |
9ab86bbc | 1094 | int err; |
3f2c31d9 | 1095 | |
f6b10209 JW |
1096 | len = SKB_DATA_ALIGN(len) + |
1097 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
1098 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) | |
9ab86bbc | 1099 | return -ENOMEM; |
296f96fc | 1100 | |
f6b10209 JW |
1101 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
1102 | get_page(alloc_frag->page); | |
1103 | alloc_frag->offset += len; | |
1104 | sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, | |
1105 | vi->hdr_len + GOOD_PACKET_LEN); | |
192f68cf | 1106 | err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); |
9ab86bbc | 1107 | if (err < 0) |
f6b10209 | 1108 | put_page(virt_to_head_page(buf)); |
9ab86bbc SM |
1109 | return err; |
1110 | } | |
97402b96 | 1111 | |
012873d0 MT |
1112 | static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, |
1113 | gfp_t gfp) | |
9ab86bbc | 1114 | { |
9ab86bbc SM |
1115 | struct page *first, *list = NULL; |
1116 | char *p; | |
1117 | int i, err, offset; | |
1118 | ||
a5835440 RR |
1119 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
1120 | ||
e9d7417b | 1121 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 1122 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 1123 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
1124 | if (!first) { |
1125 | if (list) | |
e9d7417b | 1126 | give_pages(rq, list); |
9ab86bbc | 1127 | return -ENOMEM; |
97402b96 | 1128 | } |
e9d7417b | 1129 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 1130 | |
9ab86bbc SM |
1131 | /* chain new page in list head to match sg */ |
1132 | first->private = (unsigned long)list; | |
1133 | list = first; | |
1134 | } | |
296f96fc | 1135 | |
e9d7417b | 1136 | first = get_a_page(rq, gfp); |
9ab86bbc | 1137 | if (!first) { |
e9d7417b | 1138 | give_pages(rq, list); |
9ab86bbc SM |
1139 | return -ENOMEM; |
1140 | } | |
1141 | p = page_address(first); | |
1142 | ||
e9d7417b | 1143 | /* rq->sg[0], rq->sg[1] share the same page */ |
012873d0 MT |
1144 | /* a separated rq->sg[0] for header - required in case !any_header_sg */ |
1145 | sg_set_buf(&rq->sg[0], p, vi->hdr_len); | |
9ab86bbc | 1146 | |
e9d7417b | 1147 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 1148 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 1149 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
1150 | |
1151 | /* chain first in list head */ | |
1152 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
1153 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
1154 | first, gfp); | |
9ab86bbc | 1155 | if (err < 0) |
e9d7417b | 1156 | give_pages(rq, first); |
9ab86bbc SM |
1157 | |
1158 | return err; | |
296f96fc RR |
1159 | } |
1160 | ||
d85b758f | 1161 | static unsigned int get_mergeable_buf_len(struct receive_queue *rq, |
3cc81a9a JW |
1162 | struct ewma_pkt_len *avg_pkt_len, |
1163 | unsigned int room) | |
3f2c31d9 | 1164 | { |
ab7db917 | 1165 | const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
fbf28d78 MD |
1166 | unsigned int len; |
1167 | ||
3cc81a9a JW |
1168 | if (room) |
1169 | return PAGE_SIZE - room; | |
1170 | ||
1171 | len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), | |
f0c3192c | 1172 | rq->min_buf_len, PAGE_SIZE - hdr_len); |
3cc81a9a | 1173 | |
e377fcc8 | 1174 | return ALIGN(len, L1_CACHE_BYTES); |
fbf28d78 MD |
1175 | } |
1176 | ||
2de2f7f4 JF |
1177 | static int add_recvbuf_mergeable(struct virtnet_info *vi, |
1178 | struct receive_queue *rq, gfp_t gfp) | |
fbf28d78 | 1179 | { |
fb51879d | 1180 | struct page_frag *alloc_frag = &rq->alloc_frag; |
2de2f7f4 | 1181 | unsigned int headroom = virtnet_get_headroom(vi); |
3cc81a9a JW |
1182 | unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; |
1183 | unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); | |
fb51879d | 1184 | char *buf; |
680557cf | 1185 | void *ctx; |
3f2c31d9 | 1186 | int err; |
fb51879d | 1187 | unsigned int len, hole; |
3f2c31d9 | 1188 | |
3cc81a9a JW |
1189 | /* Extra tailroom is needed to satisfy XDP's assumption. This |
1190 | * means rx frags coalescing won't work, but consider we've | |
1191 | * disabled GSO for XDP, it won't be a big issue. | |
1192 | */ | |
1193 | len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); | |
1194 | if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) | |
9ab86bbc | 1195 | return -ENOMEM; |
ab7db917 | 1196 | |
fb51879d | 1197 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
2de2f7f4 | 1198 | buf += headroom; /* advance address leaving hole at front of pkt */ |
fb51879d | 1199 | get_page(alloc_frag->page); |
3cc81a9a | 1200 | alloc_frag->offset += len + room; |
fb51879d | 1201 | hole = alloc_frag->size - alloc_frag->offset; |
3cc81a9a | 1202 | if (hole < len + room) { |
ab7db917 MD |
1203 | /* To avoid internal fragmentation, if there is very likely not |
1204 | * enough space for another buffer, add the remaining space to | |
1daa8790 | 1205 | * the current buffer. |
ab7db917 | 1206 | */ |
fb51879d MD |
1207 | len += hole; |
1208 | alloc_frag->offset += hole; | |
1209 | } | |
3f2c31d9 | 1210 | |
fb51879d | 1211 | sg_init_one(rq->sg, buf, len); |
29fda25a | 1212 | ctx = mergeable_len_to_ctx(len, headroom); |
680557cf | 1213 | err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); |
9ab86bbc | 1214 | if (err < 0) |
2613af0e | 1215 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 1216 | |
9ab86bbc SM |
1217 | return err; |
1218 | } | |
3f2c31d9 | 1219 | |
b2baed69 RR |
1220 | /* |
1221 | * Returns false if we couldn't fill entirely (OOM). | |
1222 | * | |
1223 | * Normally run in the receive path, but can also be run from ndo_open | |
1224 | * before we're receiving packets, or from refill_work which is | |
1225 | * careful to disable receiving (using napi_disable). | |
1226 | */ | |
946fa564 MT |
1227 | static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, |
1228 | gfp_t gfp) | |
9ab86bbc SM |
1229 | { |
1230 | int err; | |
1788f495 | 1231 | bool oom; |
3f2c31d9 | 1232 | |
9ab86bbc SM |
1233 | do { |
1234 | if (vi->mergeable_rx_bufs) | |
2de2f7f4 | 1235 | err = add_recvbuf_mergeable(vi, rq, gfp); |
9ab86bbc | 1236 | else if (vi->big_packets) |
012873d0 | 1237 | err = add_recvbuf_big(vi, rq, gfp); |
9ab86bbc | 1238 | else |
946fa564 | 1239 | err = add_recvbuf_small(vi, rq, gfp); |
3f2c31d9 | 1240 | |
1788f495 | 1241 | oom = err == -ENOMEM; |
9ed4cb07 | 1242 | if (err) |
3f2c31d9 | 1243 | break; |
b7dfde95 | 1244 | } while (rq->vq->num_free); |
461f03dc | 1245 | if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { |
01c32598 MT |
1246 | unsigned long flags; |
1247 | ||
1248 | flags = u64_stats_update_begin_irqsave(&rq->stats.syncp); | |
d46eeeaf | 1249 | rq->stats.kicks++; |
01c32598 | 1250 | u64_stats_update_end_irqrestore(&rq->stats.syncp, flags); |
461f03dc TM |
1251 | } |
1252 | ||
3161e453 | 1253 | return !oom; |
3f2c31d9 MM |
1254 | } |
1255 | ||
18445c4d | 1256 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
1257 | { |
1258 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 1259 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 1260 | |
e4e8452a | 1261 | virtqueue_napi_schedule(&rq->napi, rvq); |
296f96fc RR |
1262 | } |
1263 | ||
e4e8452a | 1264 | static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) |
3e9d08ec | 1265 | { |
e4e8452a | 1266 | napi_enable(napi); |
3e9d08ec BR |
1267 | |
1268 | /* If all buffers were filled by other side before we napi_enabled, we | |
e4e8452a WB |
1269 | * won't get another interrupt, so process any outstanding packets now. |
1270 | * Call local_bh_enable after to trigger softIRQ processing. | |
1271 | */ | |
1272 | local_bh_disable(); | |
1273 | virtqueue_napi_schedule(napi, vq); | |
1274 | local_bh_enable(); | |
3e9d08ec BR |
1275 | } |
1276 | ||
b92f1e67 WB |
1277 | static void virtnet_napi_tx_enable(struct virtnet_info *vi, |
1278 | struct virtqueue *vq, | |
1279 | struct napi_struct *napi) | |
1280 | { | |
1281 | if (!napi->weight) | |
1282 | return; | |
1283 | ||
1284 | /* Tx napi touches cachelines on the cpu handling tx interrupts. Only | |
1285 | * enable the feature if this is likely affine with the transmit path. | |
1286 | */ | |
1287 | if (!vi->affinity_hint_set) { | |
1288 | napi->weight = 0; | |
1289 | return; | |
1290 | } | |
1291 | ||
1292 | return virtnet_napi_enable(vq, napi); | |
1293 | } | |
1294 | ||
78a57b48 WB |
1295 | static void virtnet_napi_tx_disable(struct napi_struct *napi) |
1296 | { | |
1297 | if (napi->weight) | |
1298 | napi_disable(napi); | |
1299 | } | |
1300 | ||
3161e453 RR |
1301 | static void refill_work(struct work_struct *work) |
1302 | { | |
e9d7417b JW |
1303 | struct virtnet_info *vi = |
1304 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 1305 | bool still_empty; |
986a4f4d JW |
1306 | int i; |
1307 | ||
55257d72 | 1308 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 1309 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 1310 | |
986a4f4d | 1311 | napi_disable(&rq->napi); |
946fa564 | 1312 | still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); |
e4e8452a | 1313 | virtnet_napi_enable(rq->vq, &rq->napi); |
3161e453 | 1314 | |
986a4f4d JW |
1315 | /* In theory, this can happen: if we don't get any buffers in |
1316 | * we will *never* try to fill again. | |
1317 | */ | |
1318 | if (still_empty) | |
1319 | schedule_delayed_work(&vi->refill, HZ/2); | |
1320 | } | |
3161e453 RR |
1321 | } |
1322 | ||
2471c75e JDB |
1323 | static int virtnet_receive(struct receive_queue *rq, int budget, |
1324 | unsigned int *xdp_xmit) | |
296f96fc | 1325 | { |
e9d7417b | 1326 | struct virtnet_info *vi = rq->vq->vdev->priv; |
d46eeeaf | 1327 | struct virtnet_rq_stats stats = {}; |
a0929a44 | 1328 | unsigned int len; |
9ab86bbc | 1329 | void *buf; |
a0929a44 | 1330 | int i; |
296f96fc | 1331 | |
192f68cf | 1332 | if (!vi->big_packets || vi->mergeable_rx_bufs) { |
680557cf MT |
1333 | void *ctx; |
1334 | ||
d46eeeaf | 1335 | while (stats.packets < budget && |
680557cf | 1336 | (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { |
a0929a44 | 1337 | receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); |
d46eeeaf | 1338 | stats.packets++; |
680557cf MT |
1339 | } |
1340 | } else { | |
d46eeeaf | 1341 | while (stats.packets < budget && |
680557cf | 1342 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
a0929a44 | 1343 | receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); |
d46eeeaf | 1344 | stats.packets++; |
680557cf | 1345 | } |
296f96fc RR |
1346 | } |
1347 | ||
718be6ba | 1348 | if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { |
946fa564 | 1349 | if (!try_fill_recv(vi, rq, GFP_ATOMIC)) |
3b07e9ca | 1350 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 1351 | } |
296f96fc | 1352 | |
d7dfc5cf | 1353 | u64_stats_update_begin(&rq->stats.syncp); |
a0929a44 TM |
1354 | for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { |
1355 | size_t offset = virtnet_rq_stats_desc[i].offset; | |
1356 | u64 *item; | |
1357 | ||
d46eeeaf JW |
1358 | item = (u64 *)((u8 *)&rq->stats + offset); |
1359 | *item += *(u64 *)((u8 *)&stats + offset); | |
a0929a44 | 1360 | } |
d7dfc5cf | 1361 | u64_stats_update_end(&rq->stats.syncp); |
61845d20 | 1362 | |
d46eeeaf | 1363 | return stats.packets; |
2ffa7598 JW |
1364 | } |
1365 | ||
df133f3f | 1366 | static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi) |
ea7735d9 | 1367 | { |
ea7735d9 | 1368 | unsigned int len; |
ea7735d9 WB |
1369 | unsigned int packets = 0; |
1370 | unsigned int bytes = 0; | |
5050471d | 1371 | void *ptr; |
ea7735d9 | 1372 | |
5050471d TM |
1373 | while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
1374 | if (likely(!is_xdp_frame(ptr))) { | |
1375 | struct sk_buff *skb = ptr; | |
ea7735d9 | 1376 | |
5050471d | 1377 | pr_debug("Sent skb %p\n", skb); |
ea7735d9 | 1378 | |
5050471d TM |
1379 | bytes += skb->len; |
1380 | napi_consume_skb(skb, in_napi); | |
1381 | } else { | |
1382 | struct xdp_frame *frame = ptr_to_xdp(ptr); | |
ea7735d9 | 1383 | |
5050471d TM |
1384 | bytes += frame->len; |
1385 | xdp_return_frame(frame); | |
1386 | } | |
1387 | packets++; | |
ea7735d9 WB |
1388 | } |
1389 | ||
1390 | /* Avoid overhead when no packets have been processed | |
1391 | * happens when called speculatively from start_xmit. | |
1392 | */ | |
1393 | if (!packets) | |
1394 | return; | |
1395 | ||
d7dfc5cf TM |
1396 | u64_stats_update_begin(&sq->stats.syncp); |
1397 | sq->stats.bytes += bytes; | |
1398 | sq->stats.packets += packets; | |
1399 | u64_stats_update_end(&sq->stats.syncp); | |
ea7735d9 WB |
1400 | } |
1401 | ||
534da5e8 TM |
1402 | static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) |
1403 | { | |
1404 | if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) | |
1405 | return false; | |
1406 | else if (q < vi->curr_queue_pairs) | |
1407 | return true; | |
1408 | else | |
1409 | return false; | |
1410 | } | |
1411 | ||
7b0411ef WB |
1412 | static void virtnet_poll_cleantx(struct receive_queue *rq) |
1413 | { | |
1414 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
1415 | unsigned int index = vq2rxq(rq->vq); | |
1416 | struct send_queue *sq = &vi->sq[index]; | |
1417 | struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); | |
1418 | ||
534da5e8 | 1419 | if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index)) |
7b0411ef WB |
1420 | return; |
1421 | ||
1422 | if (__netif_tx_trylock(txq)) { | |
df133f3f | 1423 | free_old_xmit_skbs(sq, true); |
7b0411ef WB |
1424 | __netif_tx_unlock(txq); |
1425 | } | |
1426 | ||
1427 | if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) | |
1428 | netif_tx_wake_queue(txq); | |
1429 | } | |
1430 | ||
2ffa7598 JW |
1431 | static int virtnet_poll(struct napi_struct *napi, int budget) |
1432 | { | |
1433 | struct receive_queue *rq = | |
1434 | container_of(napi, struct receive_queue, napi); | |
9267c430 JW |
1435 | struct virtnet_info *vi = rq->vq->vdev->priv; |
1436 | struct send_queue *sq; | |
2a43565c | 1437 | unsigned int received; |
2471c75e | 1438 | unsigned int xdp_xmit = 0; |
2ffa7598 | 1439 | |
7b0411ef WB |
1440 | virtnet_poll_cleantx(rq); |
1441 | ||
186b3c99 | 1442 | received = virtnet_receive(rq, budget, &xdp_xmit); |
2ffa7598 | 1443 | |
8329d98e | 1444 | /* Out of packets? */ |
e4e8452a WB |
1445 | if (received < budget) |
1446 | virtqueue_napi_complete(napi, rq->vq, received); | |
296f96fc | 1447 | |
2471c75e | 1448 | if (xdp_xmit & VIRTIO_XDP_REDIR) |
1d233886 | 1449 | xdp_do_flush(); |
2471c75e JDB |
1450 | |
1451 | if (xdp_xmit & VIRTIO_XDP_TX) { | |
2a43565c | 1452 | sq = virtnet_xdp_sq(vi); |
461f03dc TM |
1453 | if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { |
1454 | u64_stats_update_begin(&sq->stats.syncp); | |
1455 | sq->stats.kicks++; | |
1456 | u64_stats_update_end(&sq->stats.syncp); | |
1457 | } | |
9267c430 | 1458 | } |
186b3c99 | 1459 | |
296f96fc RR |
1460 | return received; |
1461 | } | |
1462 | ||
986a4f4d JW |
1463 | static int virtnet_open(struct net_device *dev) |
1464 | { | |
1465 | struct virtnet_info *vi = netdev_priv(dev); | |
754b8a21 | 1466 | int i, err; |
986a4f4d | 1467 | |
e4166625 JW |
1468 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1469 | if (i < vi->curr_queue_pairs) | |
1470 | /* Make sure we have some buffers: if oom use wq. */ | |
946fa564 | 1471 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
e4166625 | 1472 | schedule_delayed_work(&vi->refill, 0); |
754b8a21 JDB |
1473 | |
1474 | err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i); | |
1475 | if (err < 0) | |
1476 | return err; | |
1477 | ||
8d5d8852 JDB |
1478 | err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq, |
1479 | MEM_TYPE_PAGE_SHARED, NULL); | |
1480 | if (err < 0) { | |
1481 | xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); | |
1482 | return err; | |
1483 | } | |
1484 | ||
e4e8452a | 1485 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
b92f1e67 | 1486 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); |
986a4f4d JW |
1487 | } |
1488 | ||
1489 | return 0; | |
1490 | } | |
1491 | ||
b92f1e67 WB |
1492 | static int virtnet_poll_tx(struct napi_struct *napi, int budget) |
1493 | { | |
1494 | struct send_queue *sq = container_of(napi, struct send_queue, napi); | |
1495 | struct virtnet_info *vi = sq->vq->vdev->priv; | |
534da5e8 TM |
1496 | unsigned int index = vq2txq(sq->vq); |
1497 | struct netdev_queue *txq; | |
b92f1e67 | 1498 | |
534da5e8 TM |
1499 | if (unlikely(is_xdp_raw_buffer_queue(vi, index))) { |
1500 | /* We don't need to enable cb for XDP */ | |
1501 | napi_complete_done(napi, 0); | |
1502 | return 0; | |
1503 | } | |
1504 | ||
1505 | txq = netdev_get_tx_queue(vi->dev, index); | |
b92f1e67 | 1506 | __netif_tx_lock(txq, raw_smp_processor_id()); |
df133f3f | 1507 | free_old_xmit_skbs(sq, true); |
b92f1e67 WB |
1508 | __netif_tx_unlock(txq); |
1509 | ||
1510 | virtqueue_napi_complete(napi, sq->vq, 0); | |
1511 | ||
1512 | if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) | |
1513 | netif_tx_wake_queue(txq); | |
1514 | ||
1515 | return 0; | |
1516 | } | |
1517 | ||
e9d7417b | 1518 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 1519 | { |
012873d0 | 1520 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
296f96fc | 1521 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 1522 | struct virtnet_info *vi = sq->vq->vdev->priv; |
e2fcad58 | 1523 | int num_sg; |
012873d0 | 1524 | unsigned hdr_len = vi->hdr_len; |
e7428e95 | 1525 | bool can_push; |
296f96fc | 1526 | |
e174961c | 1527 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
1528 | |
1529 | can_push = vi->any_header_sg && | |
1530 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
1531 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
1532 | /* Even if we can, don't push here yet as this would skew | |
1533 | * csum_start offset below. */ | |
1534 | if (can_push) | |
012873d0 | 1535 | hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); |
e7428e95 MT |
1536 | else |
1537 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 1538 | |
e858fae2 | 1539 | if (virtio_net_hdr_from_skb(skb, &hdr->hdr, |
fd3a8862 WB |
1540 | virtio_is_little_endian(vi->vdev), false, |
1541 | 0)) | |
e858fae2 | 1542 | BUG(); |
296f96fc | 1543 | |
3f2c31d9 | 1544 | if (vi->mergeable_rx_bufs) |
012873d0 | 1545 | hdr->num_buffers = 0; |
3f2c31d9 | 1546 | |
547c890c | 1547 | sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); |
e7428e95 MT |
1548 | if (can_push) { |
1549 | __skb_push(skb, hdr_len); | |
1550 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
e2fcad58 JD |
1551 | if (unlikely(num_sg < 0)) |
1552 | return num_sg; | |
e7428e95 MT |
1553 | /* Pull header back to avoid skew in tx bytes calculations. */ |
1554 | __skb_pull(skb, hdr_len); | |
1555 | } else { | |
1556 | sg_set_buf(sq->sg, hdr, hdr_len); | |
e2fcad58 JD |
1557 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); |
1558 | if (unlikely(num_sg < 0)) | |
1559 | return num_sg; | |
1560 | num_sg++; | |
e7428e95 | 1561 | } |
9dc7b9e4 | 1562 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
1563 | } |
1564 | ||
424efe9c | 1565 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
1566 | { |
1567 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
1568 | int qnum = skb_get_queue_mapping(skb); |
1569 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 1570 | int err; |
4b7fd2e6 | 1571 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
6b16f9ee | 1572 | bool kick = !netdev_xmit_more(); |
b92f1e67 | 1573 | bool use_napi = sq->napi.weight; |
2cb9c6ba | 1574 | |
2cb9c6ba | 1575 | /* Free up any pending old buffers before queueing new ones. */ |
df133f3f | 1576 | free_old_xmit_skbs(sq, false); |
99ffc696 | 1577 | |
bdb12e0d WB |
1578 | if (use_napi && kick) |
1579 | virtqueue_enable_cb_delayed(sq->vq); | |
1580 | ||
074c3582 JK |
1581 | /* timestamp packet in software */ |
1582 | skb_tx_timestamp(skb); | |
1583 | ||
03f191ba | 1584 | /* Try to transmit */ |
b7dfde95 | 1585 | err = xmit_skb(sq, skb); |
48925e37 | 1586 | |
9ed4cb07 | 1587 | /* This should not happen! */ |
681daee2 | 1588 | if (unlikely(err)) { |
9ed4cb07 RR |
1589 | dev->stats.tx_fifo_errors++; |
1590 | if (net_ratelimit()) | |
1591 | dev_warn(&dev->dev, | |
7934b481 YS |
1592 | "Unexpected TXQ (%d) queue failure: %d\n", |
1593 | qnum, err); | |
58eba97d | 1594 | dev->stats.tx_dropped++; |
85e94525 | 1595 | dev_kfree_skb_any(skb); |
58eba97d | 1596 | return NETDEV_TX_OK; |
296f96fc | 1597 | } |
03f191ba | 1598 | |
48925e37 | 1599 | /* Don't wait up for transmitted skbs to be freed. */ |
b92f1e67 WB |
1600 | if (!use_napi) { |
1601 | skb_orphan(skb); | |
895b5c9f | 1602 | nf_reset_ct(skb); |
b92f1e67 | 1603 | } |
48925e37 | 1604 | |
60302ff6 MT |
1605 | /* If running out of space, stop queue to avoid getting packets that we |
1606 | * are then unable to transmit. | |
1607 | * An alternative would be to force queuing layer to requeue the skb by | |
1608 | * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be | |
1609 | * returned in a normal path of operation: it means that driver is not | |
1610 | * maintaining the TX queue stop/start state properly, and causes | |
1611 | * the stack to do a non-trivial amount of useless work. | |
1612 | * Since most packets only take 1 or 2 ring slots, stopping the queue | |
1613 | * early means 16 slots are typically wasted. | |
d631b94e | 1614 | */ |
b7dfde95 | 1615 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 1616 | netif_stop_subqueue(dev, qnum); |
b92f1e67 WB |
1617 | if (!use_napi && |
1618 | unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { | |
48925e37 | 1619 | /* More just got used, free them then recheck. */ |
df133f3f | 1620 | free_old_xmit_skbs(sq, false); |
b7dfde95 | 1621 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { |
986a4f4d | 1622 | netif_start_subqueue(dev, qnum); |
e9d7417b | 1623 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
1624 | } |
1625 | } | |
99ffc696 | 1626 | } |
48925e37 | 1627 | |
461f03dc TM |
1628 | if (kick || netif_xmit_stopped(txq)) { |
1629 | if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { | |
1630 | u64_stats_update_begin(&sq->stats.syncp); | |
1631 | sq->stats.kicks++; | |
1632 | u64_stats_update_end(&sq->stats.syncp); | |
1633 | } | |
1634 | } | |
296f96fc | 1635 | |
0b725a2c | 1636 | return NETDEV_TX_OK; |
c223a078 DM |
1637 | } |
1638 | ||
40cbfc37 AK |
1639 | /* |
1640 | * Send command via the control virtqueue and check status. Commands | |
1641 | * supported by the hypervisor, as indicated by feature bits, should | |
788a8b6d | 1642 | * never fail unless improperly formatted. |
40cbfc37 AK |
1643 | */ |
1644 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
d24bae32 | 1645 | struct scatterlist *out) |
40cbfc37 | 1646 | { |
f7bc9594 | 1647 | struct scatterlist *sgs[4], hdr, stat; |
d24bae32 | 1648 | unsigned out_num = 0, tmp; |
40cbfc37 AK |
1649 | |
1650 | /* Caller should know better */ | |
f7bc9594 | 1651 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 | 1652 | |
12e57169 MT |
1653 | vi->ctrl->status = ~0; |
1654 | vi->ctrl->hdr.class = class; | |
1655 | vi->ctrl->hdr.cmd = cmd; | |
f7bc9594 | 1656 | /* Add header */ |
12e57169 | 1657 | sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); |
f7bc9594 | 1658 | sgs[out_num++] = &hdr; |
40cbfc37 | 1659 | |
f7bc9594 RR |
1660 | if (out) |
1661 | sgs[out_num++] = out; | |
40cbfc37 | 1662 | |
f7bc9594 | 1663 | /* Add return status. */ |
12e57169 | 1664 | sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); |
d24bae32 | 1665 | sgs[out_num] = &stat; |
40cbfc37 | 1666 | |
d24bae32 | 1667 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
a7c58146 | 1668 | virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
40cbfc37 | 1669 | |
67975901 | 1670 | if (unlikely(!virtqueue_kick(vi->cvq))) |
12e57169 | 1671 | return vi->ctrl->status == VIRTIO_NET_OK; |
40cbfc37 AK |
1672 | |
1673 | /* Spin for a response, the kick causes an ioport write, trapping | |
1674 | * into the hypervisor, so the request should be handled immediately. | |
1675 | */ | |
047b9b94 HG |
1676 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
1677 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
1678 | cpu_relax(); |
1679 | ||
12e57169 | 1680 | return vi->ctrl->status == VIRTIO_NET_OK; |
40cbfc37 AK |
1681 | } |
1682 | ||
9c46f6d4 AW |
1683 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
1684 | { | |
1685 | struct virtnet_info *vi = netdev_priv(dev); | |
1686 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 1687 | int ret; |
e37e2ff3 | 1688 | struct sockaddr *addr; |
7e58d5ae | 1689 | struct scatterlist sg; |
9c46f6d4 | 1690 | |
ba5e4426 SS |
1691 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) |
1692 | return -EOPNOTSUPP; | |
1693 | ||
801822d1 | 1694 | addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); |
e37e2ff3 AL |
1695 | if (!addr) |
1696 | return -ENOMEM; | |
e37e2ff3 AL |
1697 | |
1698 | ret = eth_prepare_mac_addr_change(dev, addr); | |
f2f2c8b4 | 1699 | if (ret) |
e37e2ff3 | 1700 | goto out; |
9c46f6d4 | 1701 | |
7e58d5ae AK |
1702 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
1703 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
1704 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1705 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
7e58d5ae AK |
1706 | dev_warn(&vdev->dev, |
1707 | "Failed to set mac address by vq command.\n"); | |
e37e2ff3 AL |
1708 | ret = -EINVAL; |
1709 | goto out; | |
7e58d5ae | 1710 | } |
7e93a02f MT |
1711 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && |
1712 | !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
855e0c52 RR |
1713 | unsigned int i; |
1714 | ||
1715 | /* Naturally, this has an atomicity problem. */ | |
1716 | for (i = 0; i < dev->addr_len; i++) | |
1717 | virtio_cwrite8(vdev, | |
1718 | offsetof(struct virtio_net_config, mac) + | |
1719 | i, addr->sa_data[i]); | |
7e58d5ae AK |
1720 | } |
1721 | ||
1722 | eth_commit_mac_addr_change(dev, p); | |
e37e2ff3 | 1723 | ret = 0; |
9c46f6d4 | 1724 | |
e37e2ff3 AL |
1725 | out: |
1726 | kfree(addr); | |
1727 | return ret; | |
9c46f6d4 AW |
1728 | } |
1729 | ||
bc1f4470 | 1730 | static void virtnet_stats(struct net_device *dev, |
1731 | struct rtnl_link_stats64 *tot) | |
3fa2a1df | 1732 | { |
1733 | struct virtnet_info *vi = netdev_priv(dev); | |
3fa2a1df | 1734 | unsigned int start; |
d7dfc5cf | 1735 | int i; |
3fa2a1df | 1736 | |
d7dfc5cf | 1737 | for (i = 0; i < vi->max_queue_pairs; i++) { |
2c4a2f7d | 1738 | u64 tpackets, tbytes, rpackets, rbytes, rdrops; |
d7dfc5cf TM |
1739 | struct receive_queue *rq = &vi->rq[i]; |
1740 | struct send_queue *sq = &vi->sq[i]; | |
3fa2a1df | 1741 | |
1742 | do { | |
d7dfc5cf TM |
1743 | start = u64_stats_fetch_begin_irq(&sq->stats.syncp); |
1744 | tpackets = sq->stats.packets; | |
1745 | tbytes = sq->stats.bytes; | |
1746 | } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); | |
83a27052 ED |
1747 | |
1748 | do { | |
d7dfc5cf | 1749 | start = u64_stats_fetch_begin_irq(&rq->stats.syncp); |
d46eeeaf JW |
1750 | rpackets = rq->stats.packets; |
1751 | rbytes = rq->stats.bytes; | |
1752 | rdrops = rq->stats.drops; | |
d7dfc5cf | 1753 | } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); |
3fa2a1df | 1754 | |
1755 | tot->rx_packets += rpackets; | |
1756 | tot->tx_packets += tpackets; | |
1757 | tot->rx_bytes += rbytes; | |
1758 | tot->tx_bytes += tbytes; | |
2c4a2f7d | 1759 | tot->rx_dropped += rdrops; |
3fa2a1df | 1760 | } |
1761 | ||
1762 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 1763 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 1764 | tot->rx_length_errors = dev->stats.rx_length_errors; |
1765 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
3fa2a1df | 1766 | } |
1767 | ||
586d17c5 JW |
1768 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
1769 | { | |
1770 | rtnl_lock(); | |
1771 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
d24bae32 | 1772 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
586d17c5 JW |
1773 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
1774 | rtnl_unlock(); | |
1775 | } | |
1776 | ||
47315329 | 1777 | static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
986a4f4d JW |
1778 | { |
1779 | struct scatterlist sg; | |
986a4f4d JW |
1780 | struct net_device *dev = vi->dev; |
1781 | ||
1782 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
1783 | return 0; | |
1784 | ||
12e57169 MT |
1785 | vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
1786 | sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); | |
986a4f4d JW |
1787 | |
1788 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
d24bae32 | 1789 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
986a4f4d JW |
1790 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
1791 | queue_pairs); | |
1792 | return -EINVAL; | |
55257d72 | 1793 | } else { |
986a4f4d | 1794 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
1795 | /* virtnet_open() will refill when device is going to up. */ |
1796 | if (dev->flags & IFF_UP) | |
1797 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 1798 | } |
986a4f4d JW |
1799 | |
1800 | return 0; | |
1801 | } | |
1802 | ||
47315329 JF |
1803 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
1804 | { | |
1805 | int err; | |
1806 | ||
1807 | rtnl_lock(); | |
1808 | err = _virtnet_set_queues(vi, queue_pairs); | |
1809 | rtnl_unlock(); | |
1810 | return err; | |
1811 | } | |
1812 | ||
296f96fc RR |
1813 | static int virtnet_close(struct net_device *dev) |
1814 | { | |
1815 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1816 | int i; |
296f96fc | 1817 | |
b2baed69 RR |
1818 | /* Make sure refill_work doesn't re-enable napi! */ |
1819 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d | 1820 | |
b92f1e67 | 1821 | for (i = 0; i < vi->max_queue_pairs; i++) { |
754b8a21 | 1822 | xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); |
986a4f4d | 1823 | napi_disable(&vi->rq[i].napi); |
78a57b48 | 1824 | virtnet_napi_tx_disable(&vi->sq[i].napi); |
b92f1e67 | 1825 | } |
296f96fc | 1826 | |
296f96fc RR |
1827 | return 0; |
1828 | } | |
1829 | ||
2af7698e AW |
1830 | static void virtnet_set_rx_mode(struct net_device *dev) |
1831 | { | |
1832 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 1833 | struct scatterlist sg[2]; |
f565a7c2 | 1834 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 1835 | struct netdev_hw_addr *ha; |
32e7bfc4 | 1836 | int uc_count; |
4cd24eaf | 1837 | int mc_count; |
f565a7c2 AW |
1838 | void *buf; |
1839 | int i; | |
2af7698e | 1840 | |
788a8b6d | 1841 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
2af7698e AW |
1842 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
1843 | return; | |
1844 | ||
12e57169 MT |
1845 | vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); |
1846 | vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1847 | |
12e57169 | 1848 | sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); |
2af7698e AW |
1849 | |
1850 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1851 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
2af7698e | 1852 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
12e57169 | 1853 | vi->ctrl->promisc ? "en" : "dis"); |
2af7698e | 1854 | |
12e57169 | 1855 | sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); |
2af7698e AW |
1856 | |
1857 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1858 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
2af7698e | 1859 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
12e57169 | 1860 | vi->ctrl->allmulti ? "en" : "dis"); |
f565a7c2 | 1861 | |
32e7bfc4 | 1862 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1863 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1864 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1865 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1866 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1867 | mac_data = buf; | |
e68ed8f0 | 1868 | if (!buf) |
f565a7c2 | 1869 | return; |
f565a7c2 | 1870 | |
23e258e1 AW |
1871 | sg_init_table(sg, 2); |
1872 | ||
f565a7c2 | 1873 | /* Store the unicast list and count in the front of the buffer */ |
fdd819b2 | 1874 | mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); |
ccffad25 | 1875 | i = 0; |
32e7bfc4 | 1876 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1877 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1878 | |
1879 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1880 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1881 | |
1882 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1883 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1884 | |
fdd819b2 | 1885 | mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); |
567ec874 | 1886 | i = 0; |
22bedad3 JP |
1887 | netdev_for_each_mc_addr(ha, dev) |
1888 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1889 | |
1890 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1891 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1892 | |
1893 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1894 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
99e872ae | 1895 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
f565a7c2 AW |
1896 | |
1897 | kfree(buf); | |
2af7698e AW |
1898 | } |
1899 | ||
80d5c368 PM |
1900 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
1901 | __be16 proto, u16 vid) | |
0bde9569 AW |
1902 | { |
1903 | struct virtnet_info *vi = netdev_priv(dev); | |
1904 | struct scatterlist sg; | |
1905 | ||
d7fad4c8 | 1906 | vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); |
12e57169 | 1907 | sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); |
0bde9569 AW |
1908 | |
1909 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1910 | VIRTIO_NET_CTRL_VLAN_ADD, &sg)) |
0bde9569 | 1911 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1912 | return 0; |
0bde9569 AW |
1913 | } |
1914 | ||
80d5c368 PM |
1915 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1916 | __be16 proto, u16 vid) | |
0bde9569 AW |
1917 | { |
1918 | struct virtnet_info *vi = netdev_priv(dev); | |
1919 | struct scatterlist sg; | |
1920 | ||
d7fad4c8 | 1921 | vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); |
12e57169 | 1922 | sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); |
0bde9569 AW |
1923 | |
1924 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1925 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
0bde9569 | 1926 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1927 | return 0; |
0bde9569 AW |
1928 | } |
1929 | ||
310974fa | 1930 | static void virtnet_clean_affinity(struct virtnet_info *vi) |
986a4f4d JW |
1931 | { |
1932 | int i; | |
1933 | ||
8898c21c WG |
1934 | if (vi->affinity_hint_set) { |
1935 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
19e226e8 CR |
1936 | virtqueue_set_affinity(vi->rq[i].vq, NULL); |
1937 | virtqueue_set_affinity(vi->sq[i].vq, NULL); | |
47be2479 WG |
1938 | } |
1939 | ||
8898c21c WG |
1940 | vi->affinity_hint_set = false; |
1941 | } | |
8898c21c | 1942 | } |
47be2479 | 1943 | |
8898c21c WG |
1944 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1945 | { | |
2ca653d6 CR |
1946 | cpumask_var_t mask; |
1947 | int stragglers; | |
1948 | int group_size; | |
1949 | int i, j, cpu; | |
1950 | int num_cpu; | |
1951 | int stride; | |
1952 | ||
1953 | if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { | |
310974fa | 1954 | virtnet_clean_affinity(vi); |
8898c21c | 1955 | return; |
986a4f4d JW |
1956 | } |
1957 | ||
2ca653d6 CR |
1958 | num_cpu = num_online_cpus(); |
1959 | stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); | |
1960 | stragglers = num_cpu >= vi->curr_queue_pairs ? | |
1961 | num_cpu % vi->curr_queue_pairs : | |
1962 | 0; | |
1963 | cpu = cpumask_next(-1, cpu_online_mask); | |
4d99f660 | 1964 | |
2ca653d6 CR |
1965 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
1966 | group_size = stride + (i < stragglers ? 1 : 0); | |
1967 | ||
1968 | for (j = 0; j < group_size; j++) { | |
1969 | cpumask_set_cpu(cpu, mask); | |
1970 | cpu = cpumask_next_wrap(cpu, cpu_online_mask, | |
1971 | nr_cpu_ids, false); | |
1972 | } | |
1973 | virtqueue_set_affinity(vi->rq[i].vq, mask); | |
1974 | virtqueue_set_affinity(vi->sq[i].vq, mask); | |
1975 | __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, false); | |
1976 | cpumask_clear(mask); | |
986a4f4d JW |
1977 | } |
1978 | ||
8898c21c | 1979 | vi->affinity_hint_set = true; |
2ca653d6 | 1980 | free_cpumask_var(mask); |
986a4f4d JW |
1981 | } |
1982 | ||
8017c279 | 1983 | static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) |
8de4b2f3 | 1984 | { |
8017c279 SAS |
1985 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, |
1986 | node); | |
1987 | virtnet_set_affinity(vi); | |
1988 | return 0; | |
1989 | } | |
8de4b2f3 | 1990 | |
8017c279 SAS |
1991 | static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) |
1992 | { | |
1993 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
1994 | node_dead); | |
1995 | virtnet_set_affinity(vi); | |
1996 | return 0; | |
1997 | } | |
3ab098df | 1998 | |
8017c279 SAS |
1999 | static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) |
2000 | { | |
2001 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
2002 | node); | |
2003 | ||
310974fa | 2004 | virtnet_clean_affinity(vi); |
8017c279 SAS |
2005 | return 0; |
2006 | } | |
2007 | ||
2008 | static enum cpuhp_state virtionet_online; | |
2009 | ||
2010 | static int virtnet_cpu_notif_add(struct virtnet_info *vi) | |
2011 | { | |
2012 | int ret; | |
2013 | ||
2014 | ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); | |
2015 | if (ret) | |
2016 | return ret; | |
2017 | ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
2018 | &vi->node_dead); | |
2019 | if (!ret) | |
2020 | return ret; | |
2021 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
2022 | return ret; | |
2023 | } | |
2024 | ||
2025 | static void virtnet_cpu_notif_remove(struct virtnet_info *vi) | |
2026 | { | |
2027 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
2028 | cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
2029 | &vi->node_dead); | |
986a4f4d JW |
2030 | } |
2031 | ||
8f9f4668 RJ |
2032 | static void virtnet_get_ringparam(struct net_device *dev, |
2033 | struct ethtool_ringparam *ring) | |
2034 | { | |
2035 | struct virtnet_info *vi = netdev_priv(dev); | |
2036 | ||
986a4f4d JW |
2037 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
2038 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
2039 | ring->rx_pending = ring->rx_max_pending; |
2040 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
2041 | } |
2042 | ||
66846048 RJ |
2043 | |
2044 | static void virtnet_get_drvinfo(struct net_device *dev, | |
2045 | struct ethtool_drvinfo *info) | |
2046 | { | |
2047 | struct virtnet_info *vi = netdev_priv(dev); | |
2048 | struct virtio_device *vdev = vi->vdev; | |
2049 | ||
2050 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
2051 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
2052 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
2053 | ||
2054 | } | |
2055 | ||
d73bcd2c JW |
2056 | /* TODO: Eliminate OOO packets during switching */ |
2057 | static int virtnet_set_channels(struct net_device *dev, | |
2058 | struct ethtool_channels *channels) | |
2059 | { | |
2060 | struct virtnet_info *vi = netdev_priv(dev); | |
2061 | u16 queue_pairs = channels->combined_count; | |
2062 | int err; | |
2063 | ||
2064 | /* We don't support separate rx/tx channels. | |
2065 | * We don't allow setting 'other' channels. | |
2066 | */ | |
2067 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
2068 | return -EINVAL; | |
2069 | ||
c18e9cd6 | 2070 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
d73bcd2c JW |
2071 | return -EINVAL; |
2072 | ||
f600b690 JF |
2073 | /* For now we don't support modifying channels while XDP is loaded |
2074 | * also when XDP is loaded all RX queues have XDP programs so we only | |
2075 | * need to check a single RX queue. | |
2076 | */ | |
2077 | if (vi->rq[0].xdp_prog) | |
2078 | return -EINVAL; | |
2079 | ||
47be2479 | 2080 | get_online_cpus(); |
47315329 | 2081 | err = _virtnet_set_queues(vi, queue_pairs); |
d73bcd2c JW |
2082 | if (!err) { |
2083 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
2084 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
2085 | ||
8898c21c | 2086 | virtnet_set_affinity(vi); |
d73bcd2c | 2087 | } |
47be2479 | 2088 | put_online_cpus(); |
d73bcd2c JW |
2089 | |
2090 | return err; | |
2091 | } | |
2092 | ||
d7dfc5cf TM |
2093 | static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) |
2094 | { | |
2095 | struct virtnet_info *vi = netdev_priv(dev); | |
2096 | char *p = (char *)data; | |
2097 | unsigned int i, j; | |
2098 | ||
2099 | switch (stringset) { | |
2100 | case ETH_SS_STATS: | |
2101 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
2102 | for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { | |
2103 | snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s", | |
2104 | i, virtnet_rq_stats_desc[j].desc); | |
2105 | p += ETH_GSTRING_LEN; | |
2106 | } | |
2107 | } | |
2108 | ||
2109 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
2110 | for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { | |
2111 | snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s", | |
2112 | i, virtnet_sq_stats_desc[j].desc); | |
2113 | p += ETH_GSTRING_LEN; | |
2114 | } | |
2115 | } | |
2116 | break; | |
2117 | } | |
2118 | } | |
2119 | ||
2120 | static int virtnet_get_sset_count(struct net_device *dev, int sset) | |
2121 | { | |
2122 | struct virtnet_info *vi = netdev_priv(dev); | |
2123 | ||
2124 | switch (sset) { | |
2125 | case ETH_SS_STATS: | |
2126 | return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + | |
2127 | VIRTNET_SQ_STATS_LEN); | |
2128 | default: | |
2129 | return -EOPNOTSUPP; | |
2130 | } | |
2131 | } | |
2132 | ||
2133 | static void virtnet_get_ethtool_stats(struct net_device *dev, | |
2134 | struct ethtool_stats *stats, u64 *data) | |
2135 | { | |
2136 | struct virtnet_info *vi = netdev_priv(dev); | |
2137 | unsigned int idx = 0, start, i, j; | |
2138 | const u8 *stats_base; | |
2139 | size_t offset; | |
2140 | ||
2141 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
2142 | struct receive_queue *rq = &vi->rq[i]; | |
2143 | ||
d46eeeaf | 2144 | stats_base = (u8 *)&rq->stats; |
d7dfc5cf TM |
2145 | do { |
2146 | start = u64_stats_fetch_begin_irq(&rq->stats.syncp); | |
2147 | for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { | |
2148 | offset = virtnet_rq_stats_desc[j].offset; | |
2149 | data[idx + j] = *(u64 *)(stats_base + offset); | |
2150 | } | |
2151 | } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); | |
2152 | idx += VIRTNET_RQ_STATS_LEN; | |
2153 | } | |
2154 | ||
2155 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
2156 | struct send_queue *sq = &vi->sq[i]; | |
2157 | ||
2158 | stats_base = (u8 *)&sq->stats; | |
2159 | do { | |
2160 | start = u64_stats_fetch_begin_irq(&sq->stats.syncp); | |
2161 | for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { | |
2162 | offset = virtnet_sq_stats_desc[j].offset; | |
2163 | data[idx + j] = *(u64 *)(stats_base + offset); | |
2164 | } | |
2165 | } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); | |
2166 | idx += VIRTNET_SQ_STATS_LEN; | |
2167 | } | |
2168 | } | |
2169 | ||
d73bcd2c JW |
2170 | static void virtnet_get_channels(struct net_device *dev, |
2171 | struct ethtool_channels *channels) | |
2172 | { | |
2173 | struct virtnet_info *vi = netdev_priv(dev); | |
2174 | ||
2175 | channels->combined_count = vi->curr_queue_pairs; | |
2176 | channels->max_combined = vi->max_queue_pairs; | |
2177 | channels->max_other = 0; | |
2178 | channels->rx_count = 0; | |
2179 | channels->tx_count = 0; | |
2180 | channels->other_count = 0; | |
2181 | } | |
2182 | ||
ebb6b4b1 PR |
2183 | static int virtnet_set_link_ksettings(struct net_device *dev, |
2184 | const struct ethtool_link_ksettings *cmd) | |
16032be5 NA |
2185 | { |
2186 | struct virtnet_info *vi = netdev_priv(dev); | |
16032be5 | 2187 | |
9aedc6e2 CF |
2188 | return ethtool_virtdev_set_link_ksettings(dev, cmd, |
2189 | &vi->speed, &vi->duplex); | |
16032be5 NA |
2190 | } |
2191 | ||
ebb6b4b1 PR |
2192 | static int virtnet_get_link_ksettings(struct net_device *dev, |
2193 | struct ethtool_link_ksettings *cmd) | |
16032be5 NA |
2194 | { |
2195 | struct virtnet_info *vi = netdev_priv(dev); | |
2196 | ||
ebb6b4b1 PR |
2197 | cmd->base.speed = vi->speed; |
2198 | cmd->base.duplex = vi->duplex; | |
2199 | cmd->base.port = PORT_OTHER; | |
16032be5 NA |
2200 | |
2201 | return 0; | |
2202 | } | |
2203 | ||
0c465be1 JW |
2204 | static int virtnet_set_coalesce(struct net_device *dev, |
2205 | struct ethtool_coalesce *ec) | |
2206 | { | |
0c465be1 JW |
2207 | struct virtnet_info *vi = netdev_priv(dev); |
2208 | int i, napi_weight; | |
2209 | ||
a51e5206 JK |
2210 | if (ec->tx_max_coalesced_frames > 1 || |
2211 | ec->rx_max_coalesced_frames != 1) | |
0c465be1 JW |
2212 | return -EINVAL; |
2213 | ||
0c465be1 | 2214 | napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0; |
0c465be1 JW |
2215 | if (napi_weight ^ vi->sq[0].napi.weight) { |
2216 | if (dev->flags & IFF_UP) | |
2217 | return -EBUSY; | |
2218 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2219 | vi->sq[i].napi.weight = napi_weight; | |
2220 | } | |
2221 | ||
2222 | return 0; | |
2223 | } | |
2224 | ||
2225 | static int virtnet_get_coalesce(struct net_device *dev, | |
2226 | struct ethtool_coalesce *ec) | |
2227 | { | |
2228 | struct ethtool_coalesce ec_default = { | |
2229 | .cmd = ETHTOOL_GCOALESCE, | |
2230 | .rx_max_coalesced_frames = 1, | |
2231 | }; | |
2232 | struct virtnet_info *vi = netdev_priv(dev); | |
2233 | ||
2234 | memcpy(ec, &ec_default, sizeof(ec_default)); | |
2235 | ||
2236 | if (vi->sq[0].napi.weight) | |
2237 | ec->tx_max_coalesced_frames = 1; | |
2238 | ||
2239 | return 0; | |
2240 | } | |
2241 | ||
16032be5 NA |
2242 | static void virtnet_init_settings(struct net_device *dev) |
2243 | { | |
2244 | struct virtnet_info *vi = netdev_priv(dev); | |
2245 | ||
2246 | vi->speed = SPEED_UNKNOWN; | |
2247 | vi->duplex = DUPLEX_UNKNOWN; | |
2248 | } | |
2249 | ||
faa9b39f JB |
2250 | static void virtnet_update_settings(struct virtnet_info *vi) |
2251 | { | |
2252 | u32 speed; | |
2253 | u8 duplex; | |
2254 | ||
2255 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) | |
2256 | return; | |
2257 | ||
2258 | speed = virtio_cread32(vi->vdev, offsetof(struct virtio_net_config, | |
2259 | speed)); | |
2260 | if (ethtool_validate_speed(speed)) | |
2261 | vi->speed = speed; | |
2262 | duplex = virtio_cread8(vi->vdev, offsetof(struct virtio_net_config, | |
2263 | duplex)); | |
2264 | if (ethtool_validate_duplex(duplex)) | |
2265 | vi->duplex = duplex; | |
2266 | } | |
2267 | ||
0fc0b732 | 2268 | static const struct ethtool_ops virtnet_ethtool_ops = { |
a51e5206 | 2269 | .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES, |
66846048 | 2270 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 2271 | .get_link = ethtool_op_get_link, |
8f9f4668 | 2272 | .get_ringparam = virtnet_get_ringparam, |
d7dfc5cf TM |
2273 | .get_strings = virtnet_get_strings, |
2274 | .get_sset_count = virtnet_get_sset_count, | |
2275 | .get_ethtool_stats = virtnet_get_ethtool_stats, | |
d73bcd2c JW |
2276 | .set_channels = virtnet_set_channels, |
2277 | .get_channels = virtnet_get_channels, | |
074c3582 | 2278 | .get_ts_info = ethtool_op_get_ts_info, |
ebb6b4b1 PR |
2279 | .get_link_ksettings = virtnet_get_link_ksettings, |
2280 | .set_link_ksettings = virtnet_set_link_ksettings, | |
0c465be1 JW |
2281 | .set_coalesce = virtnet_set_coalesce, |
2282 | .get_coalesce = virtnet_get_coalesce, | |
a9ea3fc6 HX |
2283 | }; |
2284 | ||
9fe7bfce JF |
2285 | static void virtnet_freeze_down(struct virtio_device *vdev) |
2286 | { | |
2287 | struct virtnet_info *vi = vdev->priv; | |
2288 | int i; | |
2289 | ||
2290 | /* Make sure no work handler is accessing the device */ | |
2291 | flush_work(&vi->config_work); | |
2292 | ||
05c998b7 | 2293 | netif_tx_lock_bh(vi->dev); |
9fe7bfce | 2294 | netif_device_detach(vi->dev); |
05c998b7 | 2295 | netif_tx_unlock_bh(vi->dev); |
9fe7bfce JF |
2296 | cancel_delayed_work_sync(&vi->refill); |
2297 | ||
2298 | if (netif_running(vi->dev)) { | |
b92f1e67 | 2299 | for (i = 0; i < vi->max_queue_pairs; i++) { |
9fe7bfce | 2300 | napi_disable(&vi->rq[i].napi); |
78a57b48 | 2301 | virtnet_napi_tx_disable(&vi->sq[i].napi); |
b92f1e67 | 2302 | } |
9fe7bfce JF |
2303 | } |
2304 | } | |
2305 | ||
2306 | static int init_vqs(struct virtnet_info *vi); | |
2307 | ||
2308 | static int virtnet_restore_up(struct virtio_device *vdev) | |
2309 | { | |
2310 | struct virtnet_info *vi = vdev->priv; | |
2311 | int err, i; | |
2312 | ||
2313 | err = init_vqs(vi); | |
2314 | if (err) | |
2315 | return err; | |
2316 | ||
2317 | virtio_device_ready(vdev); | |
2318 | ||
2319 | if (netif_running(vi->dev)) { | |
2320 | for (i = 0; i < vi->curr_queue_pairs; i++) | |
2321 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) | |
2322 | schedule_delayed_work(&vi->refill, 0); | |
2323 | ||
b92f1e67 | 2324 | for (i = 0; i < vi->max_queue_pairs; i++) { |
e4e8452a | 2325 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
b92f1e67 WB |
2326 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, |
2327 | &vi->sq[i].napi); | |
2328 | } | |
9fe7bfce JF |
2329 | } |
2330 | ||
05c998b7 | 2331 | netif_tx_lock_bh(vi->dev); |
9fe7bfce | 2332 | netif_device_attach(vi->dev); |
05c998b7 | 2333 | netif_tx_unlock_bh(vi->dev); |
9fe7bfce JF |
2334 | return err; |
2335 | } | |
2336 | ||
3f93522f JW |
2337 | static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) |
2338 | { | |
2339 | struct scatterlist sg; | |
12e57169 | 2340 | vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); |
3f93522f | 2341 | |
12e57169 | 2342 | sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); |
3f93522f JW |
2343 | |
2344 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, | |
2345 | VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { | |
7934b481 | 2346 | dev_warn(&vi->dev->dev, "Fail to set guest offload.\n"); |
3f93522f JW |
2347 | return -EINVAL; |
2348 | } | |
2349 | ||
2350 | return 0; | |
2351 | } | |
2352 | ||
2353 | static int virtnet_clear_guest_offloads(struct virtnet_info *vi) | |
2354 | { | |
2355 | u64 offloads = 0; | |
2356 | ||
2357 | if (!vi->guest_offloads) | |
2358 | return 0; | |
2359 | ||
3f93522f JW |
2360 | return virtnet_set_guest_offloads(vi, offloads); |
2361 | } | |
2362 | ||
2363 | static int virtnet_restore_guest_offloads(struct virtnet_info *vi) | |
2364 | { | |
2365 | u64 offloads = vi->guest_offloads; | |
2366 | ||
2367 | if (!vi->guest_offloads) | |
2368 | return 0; | |
3f93522f JW |
2369 | |
2370 | return virtnet_set_guest_offloads(vi, offloads); | |
2371 | } | |
2372 | ||
9861ce03 JK |
2373 | static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
2374 | struct netlink_ext_ack *extack) | |
f600b690 JF |
2375 | { |
2376 | unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); | |
2377 | struct virtnet_info *vi = netdev_priv(dev); | |
2378 | struct bpf_prog *old_prog; | |
017b29c3 | 2379 | u16 xdp_qp = 0, curr_qp; |
672aafd5 | 2380 | int i, err; |
f600b690 | 2381 | |
3f93522f JW |
2382 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) |
2383 | && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || | |
2384 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
2385 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || | |
18ba58e1 JW |
2386 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || |
2387 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) { | |
2388 | NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO/CSUM, disable LRO/CSUM first"); | |
f600b690 JF |
2389 | return -EOPNOTSUPP; |
2390 | } | |
2391 | ||
2392 | if (vi->mergeable_rx_bufs && !vi->any_header_sg) { | |
4d463c4d | 2393 | NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); |
f600b690 JF |
2394 | return -EINVAL; |
2395 | } | |
2396 | ||
2397 | if (dev->mtu > max_sz) { | |
4d463c4d | 2398 | NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP"); |
f600b690 JF |
2399 | netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); |
2400 | return -EINVAL; | |
2401 | } | |
2402 | ||
672aafd5 JF |
2403 | curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; |
2404 | if (prog) | |
2405 | xdp_qp = nr_cpu_ids; | |
2406 | ||
2407 | /* XDP requires extra queues for XDP_TX */ | |
2408 | if (curr_qp + xdp_qp > vi->max_queue_pairs) { | |
4d463c4d | 2409 | NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available"); |
672aafd5 JF |
2410 | netdev_warn(dev, "request %i queues but max is %i\n", |
2411 | curr_qp + xdp_qp, vi->max_queue_pairs); | |
2412 | return -ENOMEM; | |
2413 | } | |
2414 | ||
03aa6d34 TM |
2415 | old_prog = rtnl_dereference(vi->rq[0].xdp_prog); |
2416 | if (!prog && !old_prog) | |
2417 | return 0; | |
2418 | ||
85192dbf AN |
2419 | if (prog) |
2420 | bpf_prog_add(prog, vi->max_queue_pairs - 1); | |
2de2f7f4 | 2421 | |
4941d472 | 2422 | /* Make sure NAPI is not using any XDP TX queues for RX. */ |
534da5e8 TM |
2423 | if (netif_running(dev)) { |
2424 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
4e09ff53 | 2425 | napi_disable(&vi->rq[i].napi); |
534da5e8 TM |
2426 | virtnet_napi_tx_disable(&vi->sq[i].napi); |
2427 | } | |
2428 | } | |
f600b690 | 2429 | |
03aa6d34 TM |
2430 | if (!prog) { |
2431 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2432 | rcu_assign_pointer(vi->rq[i].xdp_prog, prog); | |
2433 | if (i == 0) | |
2434 | virtnet_restore_guest_offloads(vi); | |
2435 | } | |
2436 | synchronize_net(); | |
2437 | } | |
f600b690 | 2438 | |
4941d472 JW |
2439 | err = _virtnet_set_queues(vi, curr_qp + xdp_qp); |
2440 | if (err) | |
2441 | goto err; | |
188313c1 | 2442 | netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); |
4941d472 | 2443 | vi->xdp_queue_pairs = xdp_qp; |
672aafd5 | 2444 | |
03aa6d34 TM |
2445 | if (prog) { |
2446 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2447 | rcu_assign_pointer(vi->rq[i].xdp_prog, prog); | |
2448 | if (i == 0 && !old_prog) | |
3f93522f | 2449 | virtnet_clear_guest_offloads(vi); |
3f93522f | 2450 | } |
03aa6d34 TM |
2451 | } |
2452 | ||
2453 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
f600b690 JF |
2454 | if (old_prog) |
2455 | bpf_prog_put(old_prog); | |
534da5e8 | 2456 | if (netif_running(dev)) { |
4e09ff53 | 2457 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
534da5e8 TM |
2458 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, |
2459 | &vi->sq[i].napi); | |
2460 | } | |
f600b690 JF |
2461 | } |
2462 | ||
2463 | return 0; | |
2de2f7f4 | 2464 | |
4941d472 | 2465 | err: |
03aa6d34 TM |
2466 | if (!prog) { |
2467 | virtnet_clear_guest_offloads(vi); | |
2468 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2469 | rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog); | |
2470 | } | |
2471 | ||
8be4d9a4 | 2472 | if (netif_running(dev)) { |
534da5e8 | 2473 | for (i = 0; i < vi->max_queue_pairs; i++) { |
8be4d9a4 | 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 | } | |
8be4d9a4 | 2478 | } |
2de2f7f4 JF |
2479 | if (prog) |
2480 | bpf_prog_sub(prog, vi->max_queue_pairs - 1); | |
2481 | return err; | |
f600b690 JF |
2482 | } |
2483 | ||
5b0e6629 | 2484 | static u32 virtnet_xdp_query(struct net_device *dev) |
f600b690 JF |
2485 | { |
2486 | struct virtnet_info *vi = netdev_priv(dev); | |
5b0e6629 | 2487 | const struct bpf_prog *xdp_prog; |
f600b690 JF |
2488 | int i; |
2489 | ||
2490 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
5b0e6629 MKL |
2491 | xdp_prog = rtnl_dereference(vi->rq[i].xdp_prog); |
2492 | if (xdp_prog) | |
2493 | return xdp_prog->aux->id; | |
f600b690 | 2494 | } |
5b0e6629 | 2495 | return 0; |
f600b690 JF |
2496 | } |
2497 | ||
f4e63525 | 2498 | static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
f600b690 JF |
2499 | { |
2500 | switch (xdp->command) { | |
2501 | case XDP_SETUP_PROG: | |
9861ce03 | 2502 | return virtnet_xdp_set(dev, xdp->prog, xdp->extack); |
f600b690 | 2503 | case XDP_QUERY_PROG: |
5b0e6629 | 2504 | xdp->prog_id = virtnet_xdp_query(dev); |
f600b690 JF |
2505 | return 0; |
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); | |
2531 | u64 offloads; | |
2532 | int err; | |
2533 | ||
2534 | if ((dev->features ^ features) & NETIF_F_LRO) { | |
2535 | if (vi->xdp_queue_pairs) | |
2536 | return -EBUSY; | |
2537 | ||
2538 | if (features & NETIF_F_LRO) | |
2539 | offloads = vi->guest_offloads_capable; | |
2540 | else | |
2541 | offloads = 0; | |
2542 | ||
2543 | err = virtnet_set_guest_offloads(vi, offloads); | |
2544 | if (err) | |
2545 | return err; | |
2546 | vi->guest_offloads = offloads; | |
2547 | } | |
2548 | ||
2549 | return 0; | |
2550 | } | |
2551 | ||
76288b4e SH |
2552 | static const struct net_device_ops virtnet_netdev = { |
2553 | .ndo_open = virtnet_open, | |
2554 | .ndo_stop = virtnet_close, | |
2555 | .ndo_start_xmit = start_xmit, | |
2556 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 2557 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 2558 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
3fa2a1df | 2559 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
2560 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
2561 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
f4e63525 | 2562 | .ndo_bpf = virtnet_xdp, |
186b3c99 | 2563 | .ndo_xdp_xmit = virtnet_xdp_xmit, |
2836b4f2 | 2564 | .ndo_features_check = passthru_features_check, |
ba5e4426 | 2565 | .ndo_get_phys_port_name = virtnet_get_phys_port_name, |
a02e8964 | 2566 | .ndo_set_features = virtnet_set_features, |
76288b4e SH |
2567 | }; |
2568 | ||
586d17c5 | 2569 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 2570 | { |
586d17c5 JW |
2571 | struct virtnet_info *vi = |
2572 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
2573 | u16 v; |
2574 | ||
855e0c52 RR |
2575 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
2576 | struct virtio_net_config, status, &v) < 0) | |
507613bf | 2577 | return; |
586d17c5 JW |
2578 | |
2579 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 2580 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
2581 | virtnet_ack_link_announce(vi); |
2582 | } | |
9f4d26d0 MM |
2583 | |
2584 | /* Ignore unknown (future) status bits */ | |
2585 | v &= VIRTIO_NET_S_LINK_UP; | |
2586 | ||
2587 | if (vi->status == v) | |
507613bf | 2588 | return; |
9f4d26d0 MM |
2589 | |
2590 | vi->status = v; | |
2591 | ||
2592 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
faa9b39f | 2593 | virtnet_update_settings(vi); |
9f4d26d0 | 2594 | netif_carrier_on(vi->dev); |
986a4f4d | 2595 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
2596 | } else { |
2597 | netif_carrier_off(vi->dev); | |
986a4f4d | 2598 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 MM |
2599 | } |
2600 | } | |
2601 | ||
2602 | static void virtnet_config_changed(struct virtio_device *vdev) | |
2603 | { | |
2604 | struct virtnet_info *vi = vdev->priv; | |
2605 | ||
3b07e9ca | 2606 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
2607 | } |
2608 | ||
986a4f4d JW |
2609 | static void virtnet_free_queues(struct virtnet_info *vi) |
2610 | { | |
d4fb84ee AV |
2611 | int i; |
2612 | ||
ab3971b1 JW |
2613 | for (i = 0; i < vi->max_queue_pairs; i++) { |
2614 | napi_hash_del(&vi->rq[i].napi); | |
d4fb84ee | 2615 | netif_napi_del(&vi->rq[i].napi); |
b92f1e67 | 2616 | netif_napi_del(&vi->sq[i].napi); |
ab3971b1 | 2617 | } |
d4fb84ee | 2618 | |
963abe5c ED |
2619 | /* We called napi_hash_del() before netif_napi_del(), |
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; | |
3018 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) | |
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); | |
d7dfc5cf | 3077 | goto free; |
93a205ee | 3078 | } |
2e123b44 | 3079 | |
fe36cbe0 MT |
3080 | dev->mtu = mtu; |
3081 | dev->max_mtu = mtu; | |
3082 | ||
2e123b44 MT |
3083 | /* TODO: size buffers correctly in this case. */ |
3084 | if (dev->mtu > ETH_DATA_LEN) | |
3085 | vi->big_packets = true; | |
14de9d11 AC |
3086 | } |
3087 | ||
012873d0 MT |
3088 | if (vi->any_header_sg) |
3089 | dev->needed_headroom = vi->hdr_len; | |
6ebbc1a6 | 3090 | |
44900010 JW |
3091 | /* Enable multiqueue by default */ |
3092 | if (num_online_cpus() >= max_queue_pairs) | |
3093 | vi->curr_queue_pairs = max_queue_pairs; | |
3094 | else | |
3095 | vi->curr_queue_pairs = num_online_cpus(); | |
986a4f4d JW |
3096 | vi->max_queue_pairs = max_queue_pairs; |
3097 | ||
3098 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 3099 | err = init_vqs(vi); |
d2a7ddda | 3100 | if (err) |
d7dfc5cf | 3101 | goto free; |
296f96fc | 3102 | |
fbf28d78 MD |
3103 | #ifdef CONFIG_SYSFS |
3104 | if (vi->mergeable_rx_bufs) | |
3105 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; | |
3106 | #endif | |
0f13b66b ZYW |
3107 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
3108 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); | |
986a4f4d | 3109 | |
16032be5 NA |
3110 | virtnet_init_settings(dev); |
3111 | ||
ba5e4426 SS |
3112 | if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { |
3113 | vi->failover = net_failover_create(vi->dev); | |
4b8e6ac4 WY |
3114 | if (IS_ERR(vi->failover)) { |
3115 | err = PTR_ERR(vi->failover); | |
ba5e4426 | 3116 | goto free_vqs; |
4b8e6ac4 | 3117 | } |
ba5e4426 SS |
3118 | } |
3119 | ||
296f96fc RR |
3120 | err = register_netdev(dev); |
3121 | if (err) { | |
3122 | pr_debug("virtio_net: registering device failed\n"); | |
ba5e4426 | 3123 | goto free_failover; |
296f96fc | 3124 | } |
b3369c1f | 3125 | |
4baf1e33 MT |
3126 | virtio_device_ready(vdev); |
3127 | ||
8017c279 | 3128 | err = virtnet_cpu_notif_add(vi); |
8de4b2f3 WG |
3129 | if (err) { |
3130 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
f00e35e2 | 3131 | goto free_unregister_netdev; |
8de4b2f3 WG |
3132 | } |
3133 | ||
a220871b | 3134 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
44900010 | 3135 | |
167c25e4 JW |
3136 | /* Assume link up if device can't report link status, |
3137 | otherwise get link status from config. */ | |
bda7fab5 | 3138 | netif_carrier_off(dev); |
167c25e4 | 3139 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { |
3b07e9ca | 3140 | schedule_work(&vi->config_work); |
167c25e4 JW |
3141 | } else { |
3142 | vi->status = VIRTIO_NET_S_LINK_UP; | |
faa9b39f | 3143 | virtnet_update_settings(vi); |
167c25e4 JW |
3144 | netif_carrier_on(dev); |
3145 | } | |
9f4d26d0 | 3146 | |
3f93522f JW |
3147 | for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) |
3148 | if (virtio_has_feature(vi->vdev, guest_offloads[i])) | |
3149 | set_bit(guest_offloads[i], &vi->guest_offloads); | |
a02e8964 | 3150 | vi->guest_offloads_capable = vi->guest_offloads; |
3f93522f | 3151 | |
986a4f4d JW |
3152 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
3153 | dev->name, max_queue_pairs); | |
3154 | ||
296f96fc RR |
3155 | return 0; |
3156 | ||
f00e35e2 | 3157 | free_unregister_netdev: |
02465555 MT |
3158 | vi->vdev->config->reset(vdev); |
3159 | ||
b3369c1f | 3160 | unregister_netdev(dev); |
ba5e4426 SS |
3161 | free_failover: |
3162 | net_failover_destroy(vi->failover); | |
d2a7ddda | 3163 | free_vqs: |
986a4f4d | 3164 | cancel_delayed_work_sync(&vi->refill); |
fb51879d | 3165 | free_receive_page_frags(vi); |
e9d7417b | 3166 | virtnet_del_vqs(vi); |
296f96fc RR |
3167 | free: |
3168 | free_netdev(dev); | |
3169 | return err; | |
3170 | } | |
3171 | ||
04486ed0 | 3172 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 3173 | { |
04486ed0 | 3174 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
3175 | |
3176 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 3177 | free_unused_bufs(vi); |
fb6813f4 | 3178 | |
986a4f4d | 3179 | free_receive_bufs(vi); |
d2a7ddda | 3180 | |
fb51879d MD |
3181 | free_receive_page_frags(vi); |
3182 | ||
986a4f4d | 3183 | virtnet_del_vqs(vi); |
04486ed0 AS |
3184 | } |
3185 | ||
8cc085d6 | 3186 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
3187 | { |
3188 | struct virtnet_info *vi = vdev->priv; | |
3189 | ||
8017c279 | 3190 | virtnet_cpu_notif_remove(vi); |
8de4b2f3 | 3191 | |
102a2786 MT |
3192 | /* Make sure no work handler is accessing the device. */ |
3193 | flush_work(&vi->config_work); | |
586d17c5 | 3194 | |
04486ed0 AS |
3195 | unregister_netdev(vi->dev); |
3196 | ||
ba5e4426 SS |
3197 | net_failover_destroy(vi->failover); |
3198 | ||
04486ed0 | 3199 | remove_vq_common(vi); |
fb6813f4 | 3200 | |
74b2553f | 3201 | free_netdev(vi->dev); |
296f96fc RR |
3202 | } |
3203 | ||
67a75194 | 3204 | static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) |
0741bcb5 AS |
3205 | { |
3206 | struct virtnet_info *vi = vdev->priv; | |
3207 | ||
8017c279 | 3208 | virtnet_cpu_notif_remove(vi); |
9fe7bfce | 3209 | virtnet_freeze_down(vdev); |
0741bcb5 AS |
3210 | remove_vq_common(vi); |
3211 | ||
3212 | return 0; | |
3213 | } | |
3214 | ||
67a75194 | 3215 | static __maybe_unused int virtnet_restore(struct virtio_device *vdev) |
0741bcb5 AS |
3216 | { |
3217 | struct virtnet_info *vi = vdev->priv; | |
9fe7bfce | 3218 | int err; |
0741bcb5 | 3219 | |
9fe7bfce | 3220 | err = virtnet_restore_up(vdev); |
0741bcb5 AS |
3221 | if (err) |
3222 | return err; | |
986a4f4d JW |
3223 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
3224 | ||
8017c279 | 3225 | err = virtnet_cpu_notif_add(vi); |
ec9debbd JW |
3226 | if (err) |
3227 | return err; | |
3228 | ||
0741bcb5 AS |
3229 | return 0; |
3230 | } | |
0741bcb5 | 3231 | |
296f96fc RR |
3232 | static struct virtio_device_id id_table[] = { |
3233 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
3234 | { 0 }, | |
3235 | }; | |
3236 | ||
f3358507 MT |
3237 | #define VIRTNET_FEATURES \ |
3238 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ | |
3239 | VIRTIO_NET_F_MAC, \ | |
3240 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ | |
3241 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ | |
3242 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ | |
3243 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ | |
3244 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ | |
3245 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ | |
3246 | VIRTIO_NET_F_CTRL_MAC_ADDR, \ | |
faa9b39f | 3247 | VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ |
9805069d | 3248 | VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY |
f3358507 | 3249 | |
c45a6816 | 3250 | static unsigned int features[] = { |
f3358507 MT |
3251 | VIRTNET_FEATURES, |
3252 | }; | |
3253 | ||
3254 | static unsigned int features_legacy[] = { | |
3255 | VIRTNET_FEATURES, | |
3256 | VIRTIO_NET_F_GSO, | |
e7428e95 | 3257 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
3258 | }; |
3259 | ||
22402529 | 3260 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
3261 | .feature_table = features, |
3262 | .feature_table_size = ARRAY_SIZE(features), | |
f3358507 MT |
3263 | .feature_table_legacy = features_legacy, |
3264 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), | |
296f96fc RR |
3265 | .driver.name = KBUILD_MODNAME, |
3266 | .driver.owner = THIS_MODULE, | |
3267 | .id_table = id_table, | |
fe36cbe0 | 3268 | .validate = virtnet_validate, |
296f96fc | 3269 | .probe = virtnet_probe, |
8cc085d6 | 3270 | .remove = virtnet_remove, |
9f4d26d0 | 3271 | .config_changed = virtnet_config_changed, |
89107000 | 3272 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
3273 | .freeze = virtnet_freeze, |
3274 | .restore = virtnet_restore, | |
3275 | #endif | |
296f96fc RR |
3276 | }; |
3277 | ||
8017c279 SAS |
3278 | static __init int virtio_net_driver_init(void) |
3279 | { | |
3280 | int ret; | |
3281 | ||
73c1b41e | 3282 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", |
8017c279 SAS |
3283 | virtnet_cpu_online, |
3284 | virtnet_cpu_down_prep); | |
3285 | if (ret < 0) | |
3286 | goto out; | |
3287 | virtionet_online = ret; | |
73c1b41e | 3288 | ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", |
8017c279 SAS |
3289 | NULL, virtnet_cpu_dead); |
3290 | if (ret) | |
3291 | goto err_dead; | |
3292 | ||
3293 | ret = register_virtio_driver(&virtio_net_driver); | |
3294 | if (ret) | |
3295 | goto err_virtio; | |
3296 | return 0; | |
3297 | err_virtio: | |
3298 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); | |
3299 | err_dead: | |
3300 | cpuhp_remove_multi_state(virtionet_online); | |
3301 | out: | |
3302 | return ret; | |
3303 | } | |
3304 | module_init(virtio_net_driver_init); | |
3305 | ||
3306 | static __exit void virtio_net_driver_exit(void) | |
3307 | { | |
cfa0ebc9 | 3308 | unregister_virtio_driver(&virtio_net_driver); |
8017c279 SAS |
3309 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); |
3310 | cpuhp_remove_multi_state(virtionet_online); | |
8017c279 SAS |
3311 | } |
3312 | module_exit(virtio_net_driver_exit); | |
296f96fc RR |
3313 | |
3314 | MODULE_DEVICE_TABLE(virtio, id_table); | |
3315 | MODULE_DESCRIPTION("Virtio network driver"); | |
3316 | MODULE_LICENSE("GPL"); |