Commit | Line | Data |
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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 | |
dbcf24d1 | 66 | #define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \ |
1a03b8a3 TZ |
67 | (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \ |
68 | (1ULL << VIRTIO_NET_F_GUEST_ECN) | \ | |
69 | (1ULL << VIRTIO_NET_F_GUEST_UFO)) | |
70 | ||
d7dfc5cf TM |
71 | struct virtnet_stat_desc { |
72 | char desc[ETH_GSTRING_LEN]; | |
73 | size_t offset; | |
3fa2a1df | 74 | }; |
75 | ||
d7dfc5cf TM |
76 | struct virtnet_sq_stats { |
77 | struct u64_stats_sync syncp; | |
78 | u64 packets; | |
79 | u64 bytes; | |
5b8f3c8d TM |
80 | u64 xdp_tx; |
81 | u64 xdp_tx_drops; | |
461f03dc | 82 | u64 kicks; |
a520794b | 83 | u64 tx_timeouts; |
d7dfc5cf TM |
84 | }; |
85 | ||
d46eeeaf JW |
86 | struct virtnet_rq_stats { |
87 | struct u64_stats_sync syncp; | |
d7dfc5cf TM |
88 | u64 packets; |
89 | u64 bytes; | |
2c4a2f7d | 90 | u64 drops; |
5b8f3c8d TM |
91 | u64 xdp_packets; |
92 | u64 xdp_tx; | |
93 | u64 xdp_redirects; | |
94 | u64 xdp_drops; | |
461f03dc | 95 | u64 kicks; |
d7dfc5cf TM |
96 | }; |
97 | ||
98 | #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m) | |
d46eeeaf | 99 | #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m) |
d7dfc5cf TM |
100 | |
101 | static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = { | |
5b8f3c8d TM |
102 | { "packets", VIRTNET_SQ_STAT(packets) }, |
103 | { "bytes", VIRTNET_SQ_STAT(bytes) }, | |
104 | { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) }, | |
105 | { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) }, | |
461f03dc | 106 | { "kicks", VIRTNET_SQ_STAT(kicks) }, |
a520794b | 107 | { "tx_timeouts", VIRTNET_SQ_STAT(tx_timeouts) }, |
d7dfc5cf TM |
108 | }; |
109 | ||
110 | static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = { | |
5b8f3c8d TM |
111 | { "packets", VIRTNET_RQ_STAT(packets) }, |
112 | { "bytes", VIRTNET_RQ_STAT(bytes) }, | |
113 | { "drops", VIRTNET_RQ_STAT(drops) }, | |
114 | { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) }, | |
115 | { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) }, | |
116 | { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) }, | |
117 | { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) }, | |
461f03dc | 118 | { "kicks", VIRTNET_RQ_STAT(kicks) }, |
d7dfc5cf TM |
119 | }; |
120 | ||
121 | #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc) | |
122 | #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc) | |
123 | ||
e9d7417b JW |
124 | /* Internal representation of a send virtqueue */ |
125 | struct send_queue { | |
126 | /* Virtqueue associated with this send _queue */ | |
127 | struct virtqueue *vq; | |
128 | ||
129 | /* TX: fragments + linear part + virtio header */ | |
130 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
131 | |
132 | /* Name of the send queue: output.$index */ | |
133 | char name[40]; | |
b92f1e67 | 134 | |
d7dfc5cf TM |
135 | struct virtnet_sq_stats stats; |
136 | ||
b92f1e67 | 137 | struct napi_struct napi; |
e9d7417b JW |
138 | }; |
139 | ||
140 | /* Internal representation of a receive virtqueue */ | |
141 | struct receive_queue { | |
142 | /* Virtqueue associated with this receive_queue */ | |
143 | struct virtqueue *vq; | |
144 | ||
296f96fc RR |
145 | struct napi_struct napi; |
146 | ||
f600b690 JF |
147 | struct bpf_prog __rcu *xdp_prog; |
148 | ||
d7dfc5cf TM |
149 | struct virtnet_rq_stats stats; |
150 | ||
e9d7417b JW |
151 | /* Chain pages by the private ptr. */ |
152 | struct page *pages; | |
153 | ||
ab7db917 | 154 | /* Average packet length for mergeable receive buffers. */ |
5377d758 | 155 | struct ewma_pkt_len mrg_avg_pkt_len; |
ab7db917 | 156 | |
fb51879d MD |
157 | /* Page frag for packet buffer allocation. */ |
158 | struct page_frag alloc_frag; | |
159 | ||
e9d7417b JW |
160 | /* RX: fragments + linear part + virtio header */ |
161 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d | 162 | |
d85b758f MT |
163 | /* Min single buffer size for mergeable buffers case. */ |
164 | unsigned int min_buf_len; | |
165 | ||
986a4f4d JW |
166 | /* Name of this receive queue: input.$index */ |
167 | char name[40]; | |
754b8a21 JDB |
168 | |
169 | struct xdp_rxq_info xdp_rxq; | |
e9d7417b JW |
170 | }; |
171 | ||
c7114b12 AM |
172 | /* This structure can contain rss message with maximum settings for indirection table and keysize |
173 | * Note, that default structure that describes RSS configuration virtio_net_rss_config | |
174 | * contains same info but can't handle table values. | |
175 | * In any case, structure would be passed to virtio hw through sg_buf split by parts | |
176 | * because table sizes may be differ according to the device configuration. | |
177 | */ | |
178 | #define VIRTIO_NET_RSS_MAX_KEY_SIZE 40 | |
179 | #define VIRTIO_NET_RSS_MAX_TABLE_LEN 128 | |
180 | struct virtio_net_ctrl_rss { | |
181 | u32 hash_types; | |
182 | u16 indirection_table_mask; | |
183 | u16 unclassified_queue; | |
184 | u16 indirection_table[VIRTIO_NET_RSS_MAX_TABLE_LEN]; | |
185 | u16 max_tx_vq; | |
186 | u8 hash_key_length; | |
187 | u8 key[VIRTIO_NET_RSS_MAX_KEY_SIZE]; | |
188 | }; | |
189 | ||
12e57169 MT |
190 | /* Control VQ buffers: protected by the rtnl lock */ |
191 | struct control_buf { | |
192 | struct virtio_net_ctrl_hdr hdr; | |
193 | virtio_net_ctrl_ack status; | |
194 | struct virtio_net_ctrl_mq mq; | |
195 | u8 promisc; | |
196 | u8 allmulti; | |
d7fad4c8 | 197 | __virtio16 vid; |
f4ee703a | 198 | __virtio64 offloads; |
c7114b12 | 199 | struct virtio_net_ctrl_rss rss; |
12e57169 MT |
200 | }; |
201 | ||
e9d7417b JW |
202 | struct virtnet_info { |
203 | struct virtio_device *vdev; | |
204 | struct virtqueue *cvq; | |
205 | struct net_device *dev; | |
986a4f4d JW |
206 | struct send_queue *sq; |
207 | struct receive_queue *rq; | |
e9d7417b JW |
208 | unsigned int status; |
209 | ||
986a4f4d JW |
210 | /* Max # of queue pairs supported by the device */ |
211 | u16 max_queue_pairs; | |
212 | ||
213 | /* # of queue pairs currently used by the driver */ | |
214 | u16 curr_queue_pairs; | |
215 | ||
672aafd5 JF |
216 | /* # of XDP queue pairs currently used by the driver */ |
217 | u16 xdp_queue_pairs; | |
218 | ||
97c2c69e XZ |
219 | /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */ |
220 | bool xdp_enabled; | |
221 | ||
97402b96 HX |
222 | /* I like... big packets and I cannot lie! */ |
223 | bool big_packets; | |
224 | ||
3f2c31d9 MM |
225 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
226 | bool mergeable_rx_bufs; | |
227 | ||
c7114b12 AM |
228 | /* Host supports rss and/or hash report */ |
229 | bool has_rss; | |
91f41f01 | 230 | bool has_rss_hash_report; |
c7114b12 AM |
231 | u8 rss_key_size; |
232 | u16 rss_indir_table_size; | |
233 | u32 rss_hash_types_supported; | |
c1170820 | 234 | u32 rss_hash_types_saved; |
c7114b12 | 235 | |
986a4f4d JW |
236 | /* Has control virtqueue */ |
237 | bool has_cvq; | |
238 | ||
e7428e95 MT |
239 | /* Host can handle any s/g split between our header and packet data */ |
240 | bool any_header_sg; | |
241 | ||
012873d0 MT |
242 | /* Packet virtio header size */ |
243 | u8 hdr_len; | |
244 | ||
5a159128 | 245 | /* Work struct for delayed refilling if we run low on memory. */ |
3161e453 RR |
246 | struct delayed_work refill; |
247 | ||
5a159128 JW |
248 | /* Is delayed refill enabled? */ |
249 | bool refill_enabled; | |
250 | ||
251 | /* The lock to synchronize the access to refill_enabled */ | |
252 | spinlock_t refill_lock; | |
253 | ||
586d17c5 JW |
254 | /* Work struct for config space updates */ |
255 | struct work_struct config_work; | |
256 | ||
986a4f4d JW |
257 | /* Does the affinity hint is set for virtqueues? */ |
258 | bool affinity_hint_set; | |
47be2479 | 259 | |
8017c279 SAS |
260 | /* CPU hotplug instances for online & dead */ |
261 | struct hlist_node node; | |
262 | struct hlist_node node_dead; | |
2ac46030 | 263 | |
12e57169 | 264 | struct control_buf *ctrl; |
16032be5 NA |
265 | |
266 | /* Ethtool settings */ | |
267 | u8 duplex; | |
268 | u32 speed; | |
3f93522f JW |
269 | |
270 | unsigned long guest_offloads; | |
a02e8964 | 271 | unsigned long guest_offloads_capable; |
ba5e4426 SS |
272 | |
273 | /* failover when STANDBY feature enabled */ | |
274 | struct failover *failover; | |
296f96fc RR |
275 | }; |
276 | ||
9ab86bbc | 277 | struct padded_vnet_hdr { |
c1ddc42d | 278 | struct virtio_net_hdr_v1_hash hdr; |
9ab86bbc | 279 | /* |
012873d0 MT |
280 | * hdr is in a separate sg buffer, and data sg buffer shares same page |
281 | * with this header sg. This padding makes next sg 16 byte aligned | |
282 | * after the header. | |
9ab86bbc | 283 | */ |
c1ddc42d | 284 | char padding[12]; |
9ab86bbc SM |
285 | }; |
286 | ||
5050471d TM |
287 | static bool is_xdp_frame(void *ptr) |
288 | { | |
289 | return (unsigned long)ptr & VIRTIO_XDP_FLAG; | |
290 | } | |
291 | ||
292 | static void *xdp_to_ptr(struct xdp_frame *ptr) | |
293 | { | |
294 | return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG); | |
295 | } | |
296 | ||
297 | static struct xdp_frame *ptr_to_xdp(void *ptr) | |
298 | { | |
299 | return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG); | |
300 | } | |
301 | ||
986a4f4d JW |
302 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
303 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
304 | */ | |
305 | static int vq2txq(struct virtqueue *vq) | |
306 | { | |
9d0ca6ed | 307 | return (vq->index - 1) / 2; |
986a4f4d JW |
308 | } |
309 | ||
310 | static int txq2vq(int txq) | |
311 | { | |
312 | return txq * 2 + 1; | |
313 | } | |
314 | ||
315 | static int vq2rxq(struct virtqueue *vq) | |
316 | { | |
9d0ca6ed | 317 | return vq->index / 2; |
986a4f4d JW |
318 | } |
319 | ||
320 | static int rxq2vq(int rxq) | |
321 | { | |
322 | return rxq * 2; | |
323 | } | |
324 | ||
012873d0 | 325 | static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 326 | { |
012873d0 | 327 | return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; |
296f96fc RR |
328 | } |
329 | ||
9ab86bbc SM |
330 | /* |
331 | * private is used to chain pages for big packets, put the whole | |
332 | * most recent used list in the beginning for reuse | |
333 | */ | |
e9d7417b | 334 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 335 | { |
9ab86bbc | 336 | struct page *end; |
0a888fd1 | 337 | |
e9d7417b | 338 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 339 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
340 | end->private = (unsigned long)rq->pages; |
341 | rq->pages = page; | |
0a888fd1 MM |
342 | } |
343 | ||
e9d7417b | 344 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 345 | { |
e9d7417b | 346 | struct page *p = rq->pages; |
fb6813f4 | 347 | |
9ab86bbc | 348 | if (p) { |
e9d7417b | 349 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
350 | /* clear private here, it is used to chain pages */ |
351 | p->private = 0; | |
352 | } else | |
fb6813f4 RR |
353 | p = alloc_page(gfp_mask); |
354 | return p; | |
355 | } | |
356 | ||
5a159128 JW |
357 | static void enable_delayed_refill(struct virtnet_info *vi) |
358 | { | |
359 | spin_lock_bh(&vi->refill_lock); | |
360 | vi->refill_enabled = true; | |
361 | spin_unlock_bh(&vi->refill_lock); | |
362 | } | |
363 | ||
364 | static void disable_delayed_refill(struct virtnet_info *vi) | |
365 | { | |
366 | spin_lock_bh(&vi->refill_lock); | |
367 | vi->refill_enabled = false; | |
368 | spin_unlock_bh(&vi->refill_lock); | |
369 | } | |
370 | ||
e4e8452a WB |
371 | static void virtqueue_napi_schedule(struct napi_struct *napi, |
372 | struct virtqueue *vq) | |
373 | { | |
374 | if (napi_schedule_prep(napi)) { | |
375 | virtqueue_disable_cb(vq); | |
376 | __napi_schedule(napi); | |
377 | } | |
378 | } | |
379 | ||
380 | static void virtqueue_napi_complete(struct napi_struct *napi, | |
381 | struct virtqueue *vq, int processed) | |
382 | { | |
383 | int opaque; | |
384 | ||
385 | opaque = virtqueue_enable_cb_prepare(vq); | |
fdaa767a TM |
386 | if (napi_complete_done(napi, processed)) { |
387 | if (unlikely(virtqueue_poll(vq, opaque))) | |
388 | virtqueue_napi_schedule(napi, vq); | |
389 | } else { | |
390 | virtqueue_disable_cb(vq); | |
391 | } | |
e4e8452a WB |
392 | } |
393 | ||
e9d7417b | 394 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 395 | { |
e9d7417b | 396 | struct virtnet_info *vi = vq->vdev->priv; |
b92f1e67 | 397 | struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; |
296f96fc | 398 | |
2cb9c6ba | 399 | /* Suppress further interrupts. */ |
e9d7417b | 400 | virtqueue_disable_cb(vq); |
11a3a154 | 401 | |
b92f1e67 WB |
402 | if (napi->weight) |
403 | virtqueue_napi_schedule(napi, vq); | |
404 | else | |
405 | /* We were probably waiting for more output buffers. */ | |
406 | netif_wake_subqueue(vi->dev, vq2txq(vq)); | |
296f96fc RR |
407 | } |
408 | ||
28b39bc7 JW |
409 | #define MRG_CTX_HEADER_SHIFT 22 |
410 | static void *mergeable_len_to_ctx(unsigned int truesize, | |
411 | unsigned int headroom) | |
412 | { | |
413 | return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize); | |
414 | } | |
415 | ||
416 | static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx) | |
417 | { | |
418 | return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT; | |
419 | } | |
420 | ||
421 | static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx) | |
422 | { | |
423 | return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1); | |
424 | } | |
425 | ||
3464645a | 426 | /* Called from bottom half context */ |
946fa564 MT |
427 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
428 | struct receive_queue *rq, | |
2613af0e | 429 | struct page *page, unsigned int offset, |
436c9453 | 430 | unsigned int len, unsigned int truesize, |
fb32856b | 431 | bool hdr_valid, unsigned int metasize, |
c32325b8 | 432 | unsigned int headroom) |
9ab86bbc SM |
433 | { |
434 | struct sk_buff *skb; | |
012873d0 | 435 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
2613af0e | 436 | unsigned int copy, hdr_len, hdr_padded_len; |
af39c8f7 | 437 | struct page *page_to_free = NULL; |
fb32856b | 438 | int tailroom, shinfo_size; |
f80bd740 | 439 | char *p, *hdr_p, *buf; |
fb6813f4 | 440 | |
2613af0e | 441 | p = page_address(page) + offset; |
fb32856b | 442 | hdr_p = p; |
3f2c31d9 | 443 | |
012873d0 MT |
444 | hdr_len = vi->hdr_len; |
445 | if (vi->mergeable_rx_bufs) | |
c1ddc42d | 446 | hdr_padded_len = hdr_len; |
012873d0 | 447 | else |
2613af0e | 448 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
3f2c31d9 | 449 | |
c32325b8 | 450 | /* If headroom is not 0, there is an offset between the beginning of the |
fb32856b XZ |
451 | * data and the allocated space, otherwise the data and the allocated |
452 | * space are aligned. | |
8fb7da9e XZ |
453 | * |
454 | * Buffers with headroom use PAGE_SIZE as alloc size, see | |
455 | * add_recvbuf_mergeable() + get_mergeable_buf_len() | |
fb32856b | 456 | */ |
c32325b8 | 457 | truesize = headroom ? PAGE_SIZE : truesize; |
fc02e8cb | 458 | tailroom = truesize - headroom; |
c32325b8 | 459 | buf = p - headroom; |
3f2c31d9 | 460 | |
9ab86bbc | 461 | len -= hdr_len; |
2613af0e MD |
462 | offset += hdr_padded_len; |
463 | p += hdr_padded_len; | |
fc02e8cb | 464 | tailroom -= hdr_padded_len + len; |
3f2c31d9 | 465 | |
fb32856b XZ |
466 | shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
467 | ||
f80bd740 | 468 | /* copy small packet so we can reuse these pages */ |
f5d7872a | 469 | if (!NET_IP_ALIGN && len > GOOD_COPY_LEN && tailroom >= shinfo_size) { |
f80bd740 | 470 | skb = build_skb(buf, truesize); |
fb32856b XZ |
471 | if (unlikely(!skb)) |
472 | return NULL; | |
473 | ||
f80bd740 | 474 | skb_reserve(skb, p - buf); |
fb32856b | 475 | skb_put(skb, len); |
afd92d82 JW |
476 | |
477 | page = (struct page *)page->private; | |
478 | if (page) | |
479 | give_pages(rq, page); | |
fb32856b XZ |
480 | goto ok; |
481 | } | |
482 | ||
483 | /* copy small packet so we can reuse these pages for small data */ | |
484 | skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); | |
485 | if (unlikely(!skb)) | |
486 | return NULL; | |
487 | ||
0f6925b3 ED |
488 | /* Copy all frame if it fits skb->head, otherwise |
489 | * we let virtio_net_hdr_to_skb() and GRO pull headers as needed. | |
490 | */ | |
491 | if (len <= skb_tailroom(skb)) | |
492 | copy = len; | |
493 | else | |
494 | copy = ETH_HLEN + metasize; | |
59ae1d12 | 495 | skb_put_data(skb, p, copy); |
3f2c31d9 | 496 | |
9ab86bbc SM |
497 | len -= copy; |
498 | offset += copy; | |
3f2c31d9 | 499 | |
2613af0e MD |
500 | if (vi->mergeable_rx_bufs) { |
501 | if (len) | |
502 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); | |
503 | else | |
af39c8f7 | 504 | page_to_free = page; |
fb32856b | 505 | goto ok; |
2613af0e MD |
506 | } |
507 | ||
e878d78b SL |
508 | /* |
509 | * Verify that we can indeed put this data into a skb. | |
510 | * This is here to handle cases when the device erroneously | |
511 | * tries to receive more than is possible. This is usually | |
512 | * the case of a broken device. | |
513 | */ | |
514 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 515 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
516 | dev_kfree_skb(skb); |
517 | return NULL; | |
518 | } | |
2613af0e | 519 | BUG_ON(offset >= PAGE_SIZE); |
9ab86bbc | 520 | while (len) { |
2613af0e MD |
521 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
522 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, | |
523 | frag_size, truesize); | |
524 | len -= frag_size; | |
9ab86bbc SM |
525 | page = (struct page *)page->private; |
526 | offset = 0; | |
527 | } | |
3f2c31d9 | 528 | |
9ab86bbc | 529 | if (page) |
e9d7417b | 530 | give_pages(rq, page); |
3f2c31d9 | 531 | |
fb32856b XZ |
532 | ok: |
533 | /* hdr_valid means no XDP, so we can copy the vnet header */ | |
534 | if (hdr_valid) { | |
535 | hdr = skb_vnet_hdr(skb); | |
536 | memcpy(hdr, hdr_p, hdr_len); | |
537 | } | |
af39c8f7 ED |
538 | if (page_to_free) |
539 | put_page(page_to_free); | |
fb32856b XZ |
540 | |
541 | if (metasize) { | |
542 | __skb_pull(skb, metasize); | |
543 | skb_metadata_set(skb, metasize); | |
544 | } | |
545 | ||
9ab86bbc SM |
546 | return skb; |
547 | } | |
3f2c31d9 | 548 | |
735fc405 JDB |
549 | static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, |
550 | struct send_queue *sq, | |
551 | struct xdp_frame *xdpf) | |
56434a01 | 552 | { |
56434a01 | 553 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
56434a01 JF |
554 | int err; |
555 | ||
cac320c8 JDB |
556 | if (unlikely(xdpf->headroom < vi->hdr_len)) |
557 | return -EOVERFLOW; | |
558 | ||
559 | /* Make room for virtqueue hdr (also change xdpf->headroom?) */ | |
560 | xdpf->data -= vi->hdr_len; | |
f6b10209 | 561 | /* Zero header and leave csum up to XDP layers */ |
cac320c8 | 562 | hdr = xdpf->data; |
f6b10209 | 563 | memset(hdr, 0, vi->hdr_len); |
cac320c8 | 564 | xdpf->len += vi->hdr_len; |
bb91accf | 565 | |
cac320c8 | 566 | sg_init_one(sq->sg, xdpf->data, xdpf->len); |
bb91accf | 567 | |
5050471d TM |
568 | err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp_to_ptr(xdpf), |
569 | GFP_ATOMIC); | |
11b7d897 | 570 | if (unlikely(err)) |
cac320c8 | 571 | return -ENOSPC; /* Caller handle free/refcnt */ |
56434a01 | 572 | |
cac320c8 | 573 | return 0; |
56434a01 JF |
574 | } |
575 | ||
97c2c69e XZ |
576 | /* when vi->curr_queue_pairs > nr_cpu_ids, the txq/sq is only used for xdp tx on |
577 | * the current cpu, so it does not need to be locked. | |
578 | * | |
579 | * Here we use marco instead of inline functions because we have to deal with | |
580 | * three issues at the same time: 1. the choice of sq. 2. judge and execute the | |
581 | * lock/unlock of txq 3. make sparse happy. It is difficult for two inline | |
582 | * functions to perfectly solve these three problems at the same time. | |
583 | */ | |
584 | #define virtnet_xdp_get_sq(vi) ({ \ | |
3dcc1edc | 585 | int cpu = smp_processor_id(); \ |
97c2c69e XZ |
586 | struct netdev_queue *txq; \ |
587 | typeof(vi) v = (vi); \ | |
588 | unsigned int qp; \ | |
589 | \ | |
590 | if (v->curr_queue_pairs > nr_cpu_ids) { \ | |
591 | qp = v->curr_queue_pairs - v->xdp_queue_pairs; \ | |
3dcc1edc | 592 | qp += cpu; \ |
97c2c69e XZ |
593 | txq = netdev_get_tx_queue(v->dev, qp); \ |
594 | __netif_tx_acquire(txq); \ | |
595 | } else { \ | |
3dcc1edc | 596 | qp = cpu % v->curr_queue_pairs; \ |
97c2c69e | 597 | txq = netdev_get_tx_queue(v->dev, qp); \ |
3dcc1edc | 598 | __netif_tx_lock(txq, cpu); \ |
97c2c69e XZ |
599 | } \ |
600 | v->sq + qp; \ | |
601 | }) | |
602 | ||
603 | #define virtnet_xdp_put_sq(vi, q) { \ | |
604 | struct netdev_queue *txq; \ | |
605 | typeof(vi) v = (vi); \ | |
606 | \ | |
607 | txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \ | |
608 | if (v->curr_queue_pairs > nr_cpu_ids) \ | |
609 | __netif_tx_release(txq); \ | |
610 | else \ | |
611 | __netif_tx_unlock(txq); \ | |
2a43565c TM |
612 | } |
613 | ||
735fc405 | 614 | static int virtnet_xdp_xmit(struct net_device *dev, |
42b33468 | 615 | int n, struct xdp_frame **frames, u32 flags) |
186b3c99 JW |
616 | { |
617 | struct virtnet_info *vi = netdev_priv(dev); | |
8dcc5b0a JDB |
618 | struct receive_queue *rq = vi->rq; |
619 | struct bpf_prog *xdp_prog; | |
735fc405 JDB |
620 | struct send_queue *sq; |
621 | unsigned int len; | |
546f2897 TM |
622 | int packets = 0; |
623 | int bytes = 0; | |
fdc13979 | 624 | int nxmit = 0; |
461f03dc | 625 | int kicks = 0; |
5050471d | 626 | void *ptr; |
fdc13979 | 627 | int ret; |
735fc405 JDB |
628 | int i; |
629 | ||
8dcc5b0a JDB |
630 | /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this |
631 | * indicate XDP resources have been successfully allocated. | |
632 | */ | |
9719c6b9 | 633 | xdp_prog = rcu_access_pointer(rq->xdp_prog); |
1667c08a TM |
634 | if (!xdp_prog) |
635 | return -ENXIO; | |
636 | ||
97c2c69e | 637 | sq = virtnet_xdp_get_sq(vi); |
1667c08a TM |
638 | |
639 | if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { | |
640 | ret = -EINVAL; | |
5b8f3c8d TM |
641 | goto out; |
642 | } | |
8dcc5b0a | 643 | |
735fc405 | 644 | /* Free up any pending old buffers before queueing new ones. */ |
5050471d | 645 | while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
546f2897 TM |
646 | if (likely(is_xdp_frame(ptr))) { |
647 | struct xdp_frame *frame = ptr_to_xdp(ptr); | |
648 | ||
649 | bytes += frame->len; | |
650 | xdp_return_frame(frame); | |
651 | } else { | |
652 | struct sk_buff *skb = ptr; | |
653 | ||
654 | bytes += skb->len; | |
655 | napi_consume_skb(skb, false); | |
656 | } | |
657 | packets++; | |
5050471d | 658 | } |
735fc405 JDB |
659 | |
660 | for (i = 0; i < n; i++) { | |
661 | struct xdp_frame *xdpf = frames[i]; | |
662 | ||
fdc13979 LB |
663 | if (__virtnet_xdp_xmit_one(vi, sq, xdpf)) |
664 | break; | |
665 | nxmit++; | |
735fc405 | 666 | } |
fdc13979 | 667 | ret = nxmit; |
5d274cb4 | 668 | |
461f03dc TM |
669 | if (flags & XDP_XMIT_FLUSH) { |
670 | if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) | |
671 | kicks = 1; | |
672 | } | |
5b8f3c8d TM |
673 | out: |
674 | u64_stats_update_begin(&sq->stats.syncp); | |
546f2897 TM |
675 | sq->stats.bytes += bytes; |
676 | sq->stats.packets += packets; | |
5b8f3c8d | 677 | sq->stats.xdp_tx += n; |
fdc13979 | 678 | sq->stats.xdp_tx_drops += n - nxmit; |
461f03dc | 679 | sq->stats.kicks += kicks; |
5b8f3c8d | 680 | u64_stats_update_end(&sq->stats.syncp); |
5d274cb4 | 681 | |
97c2c69e | 682 | virtnet_xdp_put_sq(vi, sq); |
5b8f3c8d | 683 | return ret; |
186b3c99 JW |
684 | } |
685 | ||
f6b10209 JW |
686 | static unsigned int virtnet_get_headroom(struct virtnet_info *vi) |
687 | { | |
97c2c69e | 688 | return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0; |
f6b10209 JW |
689 | } |
690 | ||
4941d472 JW |
691 | /* We copy the packet for XDP in the following cases: |
692 | * | |
693 | * 1) Packet is scattered across multiple rx buffers. | |
694 | * 2) Headroom space is insufficient. | |
695 | * | |
696 | * This is inefficient but it's a temporary condition that | |
697 | * we hit right after XDP is enabled and until queue is refilled | |
698 | * with large buffers with sufficient headroom - so it should affect | |
699 | * at most queue size packets. | |
700 | * Afterwards, the conditions to enable | |
701 | * XDP should preclude the underlying device from sending packets | |
702 | * across multiple buffers (num_buf > 1), and we make sure buffers | |
703 | * have enough headroom. | |
704 | */ | |
705 | static struct page *xdp_linearize_page(struct receive_queue *rq, | |
706 | u16 *num_buf, | |
707 | struct page *p, | |
708 | int offset, | |
709 | int page_off, | |
710 | unsigned int *len) | |
711 | { | |
712 | struct page *page = alloc_page(GFP_ATOMIC); | |
713 | ||
714 | if (!page) | |
715 | return NULL; | |
716 | ||
717 | memcpy(page_address(page) + page_off, page_address(p) + offset, *len); | |
718 | page_off += *len; | |
719 | ||
720 | while (--*num_buf) { | |
3cc81a9a | 721 | int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
4941d472 JW |
722 | unsigned int buflen; |
723 | void *buf; | |
724 | int off; | |
725 | ||
726 | buf = virtqueue_get_buf(rq->vq, &buflen); | |
727 | if (unlikely(!buf)) | |
728 | goto err_buf; | |
729 | ||
730 | p = virt_to_head_page(buf); | |
731 | off = buf - page_address(p); | |
732 | ||
733 | /* guard against a misconfigured or uncooperative backend that | |
734 | * is sending packet larger than the MTU. | |
735 | */ | |
3cc81a9a | 736 | if ((page_off + buflen + tailroom) > PAGE_SIZE) { |
4941d472 JW |
737 | put_page(p); |
738 | goto err_buf; | |
739 | } | |
740 | ||
741 | memcpy(page_address(page) + page_off, | |
742 | page_address(p) + off, buflen); | |
743 | page_off += buflen; | |
744 | put_page(p); | |
745 | } | |
746 | ||
747 | /* Headroom does not contribute to packet length */ | |
748 | *len = page_off - VIRTIO_XDP_HEADROOM; | |
749 | return page; | |
750 | err_buf: | |
751 | __free_pages(page, 0); | |
752 | return NULL; | |
753 | } | |
754 | ||
bb91accf JW |
755 | static struct sk_buff *receive_small(struct net_device *dev, |
756 | struct virtnet_info *vi, | |
757 | struct receive_queue *rq, | |
192f68cf | 758 | void *buf, void *ctx, |
186b3c99 | 759 | unsigned int len, |
7d9d60fd | 760 | unsigned int *xdp_xmit, |
d46eeeaf | 761 | struct virtnet_rq_stats *stats) |
f121159d | 762 | { |
f6b10209 | 763 | struct sk_buff *skb; |
bb91accf | 764 | struct bpf_prog *xdp_prog; |
4941d472 | 765 | unsigned int xdp_headroom = (unsigned long)ctx; |
f6b10209 JW |
766 | unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; |
767 | unsigned int headroom = vi->hdr_len + header_offset; | |
768 | unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + | |
769 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
4941d472 | 770 | struct page *page = virt_to_head_page(buf); |
11b7d897 | 771 | unsigned int delta = 0; |
4941d472 | 772 | struct page *xdp_page; |
11b7d897 | 773 | int err; |
503d539a | 774 | unsigned int metasize = 0; |
11b7d897 | 775 | |
012873d0 | 776 | len -= vi->hdr_len; |
d46eeeaf | 777 | stats->bytes += len; |
f121159d | 778 | |
ad993a95 XY |
779 | if (unlikely(len > GOOD_PACKET_LEN)) { |
780 | pr_debug("%s: rx error: len %u exceeds max size %d\n", | |
781 | dev->name, len, GOOD_PACKET_LEN); | |
782 | dev->stats.rx_length_errors++; | |
053c9e18 | 783 | goto err; |
ad993a95 | 784 | } |
6213f07c LR |
785 | |
786 | if (likely(!vi->xdp_enabled)) { | |
787 | xdp_prog = NULL; | |
788 | goto skip_xdp; | |
789 | } | |
790 | ||
bb91accf JW |
791 | rcu_read_lock(); |
792 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
793 | if (xdp_prog) { | |
f6b10209 | 794 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; |
44fa2dbd | 795 | struct xdp_frame *xdpf; |
0354e4d1 | 796 | struct xdp_buff xdp; |
f6b10209 | 797 | void *orig_data; |
bb91accf JW |
798 | u32 act; |
799 | ||
95dbe9e7 | 800 | if (unlikely(hdr->hdr.gso_type)) |
bb91accf | 801 | goto err_xdp; |
0354e4d1 | 802 | |
4941d472 JW |
803 | if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { |
804 | int offset = buf - page_address(page) + header_offset; | |
805 | unsigned int tlen = len + vi->hdr_len; | |
806 | u16 num_buf = 1; | |
807 | ||
808 | xdp_headroom = virtnet_get_headroom(vi); | |
809 | header_offset = VIRTNET_RX_PAD + xdp_headroom; | |
810 | headroom = vi->hdr_len + header_offset; | |
811 | buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + | |
812 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
813 | xdp_page = xdp_linearize_page(rq, &num_buf, page, | |
814 | offset, header_offset, | |
815 | &tlen); | |
816 | if (!xdp_page) | |
817 | goto err_xdp; | |
818 | ||
819 | buf = page_address(xdp_page); | |
820 | put_page(page); | |
821 | page = xdp_page; | |
822 | } | |
823 | ||
43b5169d | 824 | xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); |
be9df4af LB |
825 | xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, |
826 | xdp_headroom, len, true); | |
f6b10209 | 827 | orig_data = xdp.data; |
0354e4d1 | 828 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
d46eeeaf | 829 | stats->xdp_packets++; |
0354e4d1 | 830 | |
bb91accf JW |
831 | switch (act) { |
832 | case XDP_PASS: | |
2de2f7f4 | 833 | /* Recalculate length in case bpf program changed it */ |
f6b10209 | 834 | delta = orig_data - xdp.data; |
6870de43 | 835 | len = xdp.data_end - xdp.data; |
503d539a | 836 | metasize = xdp.data - xdp.data_meta; |
bb91accf JW |
837 | break; |
838 | case XDP_TX: | |
d46eeeaf | 839 | stats->xdp_tx++; |
1b698fa5 | 840 | xdpf = xdp_convert_buff_to_frame(&xdp); |
44fa2dbd JDB |
841 | if (unlikely(!xdpf)) |
842 | goto err_xdp; | |
ca9e83b4 | 843 | err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); |
fdc13979 LB |
844 | if (unlikely(!err)) { |
845 | xdp_return_frame_rx_napi(xdpf); | |
846 | } else if (unlikely(err < 0)) { | |
0354e4d1 | 847 | trace_xdp_exception(vi->dev, xdp_prog, act); |
11b7d897 JDB |
848 | goto err_xdp; |
849 | } | |
2471c75e | 850 | *xdp_xmit |= VIRTIO_XDP_TX; |
186b3c99 JW |
851 | rcu_read_unlock(); |
852 | goto xdp_xmit; | |
853 | case XDP_REDIRECT: | |
d46eeeaf | 854 | stats->xdp_redirects++; |
186b3c99 | 855 | err = xdp_do_redirect(dev, &xdp, xdp_prog); |
11b7d897 JDB |
856 | if (err) |
857 | goto err_xdp; | |
2471c75e | 858 | *xdp_xmit |= VIRTIO_XDP_REDIR; |
bb91accf JW |
859 | rcu_read_unlock(); |
860 | goto xdp_xmit; | |
bb91accf | 861 | default: |
c8064e5b | 862 | bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act); |
df561f66 | 863 | fallthrough; |
0354e4d1 JF |
864 | case XDP_ABORTED: |
865 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
95efabf0 | 866 | goto err_xdp; |
0354e4d1 | 867 | case XDP_DROP: |
bb91accf JW |
868 | goto err_xdp; |
869 | } | |
870 | } | |
871 | rcu_read_unlock(); | |
872 | ||
6213f07c | 873 | skip_xdp: |
f6b10209 | 874 | skb = build_skb(buf, buflen); |
053c9e18 | 875 | if (!skb) |
f6b10209 | 876 | goto err; |
f6b10209 | 877 | skb_reserve(skb, headroom - delta); |
6870de43 | 878 | skb_put(skb, len); |
f1d4884d | 879 | if (!xdp_prog) { |
f6b10209 JW |
880 | buf += header_offset; |
881 | memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); | |
f1d4884d | 882 | } /* keep zeroed vnet hdr since XDP is loaded */ |
f6b10209 | 883 | |
503d539a YK |
884 | if (metasize) |
885 | skb_metadata_set(skb, metasize); | |
886 | ||
f121159d | 887 | return skb; |
bb91accf JW |
888 | |
889 | err_xdp: | |
890 | rcu_read_unlock(); | |
d46eeeaf | 891 | stats->xdp_drops++; |
053c9e18 | 892 | err: |
d46eeeaf | 893 | stats->drops++; |
4941d472 | 894 | put_page(page); |
bb91accf JW |
895 | xdp_xmit: |
896 | return NULL; | |
f121159d MT |
897 | } |
898 | ||
899 | static struct sk_buff *receive_big(struct net_device *dev, | |
946fa564 | 900 | struct virtnet_info *vi, |
f121159d MT |
901 | struct receive_queue *rq, |
902 | void *buf, | |
7d9d60fd | 903 | unsigned int len, |
d46eeeaf | 904 | struct virtnet_rq_stats *stats) |
f121159d MT |
905 | { |
906 | struct page *page = buf; | |
503d539a | 907 | struct sk_buff *skb = |
fb32856b | 908 | page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, true, 0, 0); |
f600b690 | 909 | |
d46eeeaf | 910 | stats->bytes += len - vi->hdr_len; |
f121159d MT |
911 | if (unlikely(!skb)) |
912 | goto err; | |
913 | ||
914 | return skb; | |
915 | ||
916 | err: | |
d46eeeaf | 917 | stats->drops++; |
f121159d MT |
918 | give_pages(rq, page); |
919 | return NULL; | |
920 | } | |
921 | ||
8fc3b9e9 | 922 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
fdd819b2 | 923 | struct virtnet_info *vi, |
8fc3b9e9 | 924 | struct receive_queue *rq, |
680557cf MT |
925 | void *buf, |
926 | void *ctx, | |
186b3c99 | 927 | unsigned int len, |
7d9d60fd | 928 | unsigned int *xdp_xmit, |
d46eeeaf | 929 | struct virtnet_rq_stats *stats) |
9ab86bbc | 930 | { |
012873d0 MT |
931 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; |
932 | u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); | |
8fc3b9e9 MT |
933 | struct page *page = virt_to_head_page(buf); |
934 | int offset = buf - page_address(page); | |
f600b690 JF |
935 | struct sk_buff *head_skb, *curr_skb; |
936 | struct bpf_prog *xdp_prog; | |
9ce6146e | 937 | unsigned int truesize = mergeable_ctx_to_truesize(ctx); |
4941d472 | 938 | unsigned int headroom = mergeable_ctx_to_headroom(ctx); |
503d539a | 939 | unsigned int metasize = 0; |
9ce6146e JDB |
940 | unsigned int frame_sz; |
941 | int err; | |
f600b690 | 942 | |
56434a01 | 943 | head_skb = NULL; |
d46eeeaf | 944 | stats->bytes += len - vi->hdr_len; |
56434a01 | 945 | |
ad993a95 XY |
946 | if (unlikely(len > truesize)) { |
947 | pr_debug("%s: rx error: len %u exceeds truesize %lu\n", | |
948 | dev->name, len, (unsigned long)ctx); | |
949 | dev->stats.rx_length_errors++; | |
950 | goto err_skb; | |
951 | } | |
6213f07c LR |
952 | |
953 | if (likely(!vi->xdp_enabled)) { | |
954 | xdp_prog = NULL; | |
955 | goto skip_xdp; | |
956 | } | |
957 | ||
f600b690 JF |
958 | rcu_read_lock(); |
959 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
960 | if (xdp_prog) { | |
44fa2dbd | 961 | struct xdp_frame *xdpf; |
72979a6c | 962 | struct page *xdp_page; |
0354e4d1 | 963 | struct xdp_buff xdp; |
0354e4d1 | 964 | void *data; |
f600b690 JF |
965 | u32 act; |
966 | ||
3d62b2a0 JW |
967 | /* Transient failure which in theory could occur if |
968 | * in-flight packets from before XDP was enabled reach | |
969 | * the receive path after XDP is loaded. | |
970 | */ | |
971 | if (unlikely(hdr->hdr.gso_type)) | |
972 | goto err_xdp; | |
973 | ||
9ce6146e JDB |
974 | /* Buffers with headroom use PAGE_SIZE as alloc size, |
975 | * see add_recvbuf_mergeable() + get_mergeable_buf_len() | |
976 | */ | |
977 | frame_sz = headroom ? PAGE_SIZE : truesize; | |
978 | ||
3cc81a9a JW |
979 | /* This happens when rx buffer size is underestimated |
980 | * or headroom is not enough because of the buffer | |
981 | * was refilled before XDP is set. This should only | |
982 | * happen for the first several packets, so we don't | |
983 | * care much about its performance. | |
984 | */ | |
4941d472 JW |
985 | if (unlikely(num_buf > 1 || |
986 | headroom < virtnet_get_headroom(vi))) { | |
72979a6c | 987 | /* linearize data for XDP */ |
56a86f84 | 988 | xdp_page = xdp_linearize_page(rq, &num_buf, |
4941d472 JW |
989 | page, offset, |
990 | VIRTIO_XDP_HEADROOM, | |
991 | &len); | |
9ce6146e JDB |
992 | frame_sz = PAGE_SIZE; |
993 | ||
72979a6c JF |
994 | if (!xdp_page) |
995 | goto err_xdp; | |
2de2f7f4 | 996 | offset = VIRTIO_XDP_HEADROOM; |
72979a6c JF |
997 | } else { |
998 | xdp_page = page; | |
f600b690 JF |
999 | } |
1000 | ||
2de2f7f4 JF |
1001 | /* Allow consuming headroom but reserve enough space to push |
1002 | * the descriptor on if we get an XDP_TX return code. | |
1003 | */ | |
0354e4d1 | 1004 | data = page_address(xdp_page) + offset; |
43b5169d | 1005 | xdp_init_buff(&xdp, frame_sz - vi->hdr_len, &rq->xdp_rxq); |
be9df4af LB |
1006 | xdp_prepare_buff(&xdp, data - VIRTIO_XDP_HEADROOM + vi->hdr_len, |
1007 | VIRTIO_XDP_HEADROOM, len - vi->hdr_len, true); | |
754b8a21 | 1008 | |
0354e4d1 | 1009 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
d46eeeaf | 1010 | stats->xdp_packets++; |
0354e4d1 | 1011 | |
56434a01 JF |
1012 | switch (act) { |
1013 | case XDP_PASS: | |
503d539a YK |
1014 | metasize = xdp.data - xdp.data_meta; |
1015 | ||
2de2f7f4 | 1016 | /* recalculate offset to account for any header |
503d539a YK |
1017 | * adjustments and minus the metasize to copy the |
1018 | * metadata in page_to_skb(). Note other cases do not | |
1019 | * build an skb and avoid using offset | |
2de2f7f4 | 1020 | */ |
503d539a YK |
1021 | offset = xdp.data - page_address(xdp_page) - |
1022 | vi->hdr_len - metasize; | |
2de2f7f4 | 1023 | |
503d539a YK |
1024 | /* recalculate len if xdp.data, xdp.data_end or |
1025 | * xdp.data_meta were adjusted | |
6870de43 | 1026 | */ |
503d539a | 1027 | len = xdp.data_end - xdp.data + vi->hdr_len + metasize; |
acb16b39 NA |
1028 | |
1029 | /* recalculate headroom if xdp.data or xdp_data_meta | |
1030 | * were adjusted, note that offset should always point | |
1031 | * to the start of the reserved bytes for virtio_net | |
1032 | * header which are followed by xdp.data, that means | |
1033 | * that offset is equal to the headroom (when buf is | |
1034 | * starting at the beginning of the page, otherwise | |
1035 | * there is a base offset inside the page) but it's used | |
1036 | * with a different starting point (buf start) than | |
1037 | * xdp.data (buf start + vnet hdr size). If xdp.data or | |
1038 | * data_meta were adjusted by the xdp prog then the | |
1039 | * headroom size has changed and so has the offset, we | |
1040 | * can use data_hard_start, which points at buf start + | |
1041 | * vnet hdr size, to calculate the new headroom and use | |
1042 | * it later to compute buf start in page_to_skb() | |
1043 | */ | |
1044 | headroom = xdp.data - xdp.data_hard_start - metasize; | |
1045 | ||
1830f893 JW |
1046 | /* We can only create skb based on xdp_page. */ |
1047 | if (unlikely(xdp_page != page)) { | |
1048 | rcu_read_unlock(); | |
1049 | put_page(page); | |
503d539a YK |
1050 | head_skb = page_to_skb(vi, rq, xdp_page, offset, |
1051 | len, PAGE_SIZE, false, | |
c32325b8 | 1052 | metasize, |
acb16b39 | 1053 | headroom); |
1830f893 JW |
1054 | return head_skb; |
1055 | } | |
56434a01 JF |
1056 | break; |
1057 | case XDP_TX: | |
d46eeeaf | 1058 | stats->xdp_tx++; |
1b698fa5 | 1059 | xdpf = xdp_convert_buff_to_frame(&xdp); |
7a542bee XZ |
1060 | if (unlikely(!xdpf)) { |
1061 | if (unlikely(xdp_page != page)) | |
1062 | put_page(xdp_page); | |
44fa2dbd | 1063 | goto err_xdp; |
7a542bee | 1064 | } |
ca9e83b4 | 1065 | err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); |
fdc13979 LB |
1066 | if (unlikely(!err)) { |
1067 | xdp_return_frame_rx_napi(xdpf); | |
1068 | } else if (unlikely(err < 0)) { | |
0354e4d1 | 1069 | trace_xdp_exception(vi->dev, xdp_prog, act); |
11b7d897 JDB |
1070 | if (unlikely(xdp_page != page)) |
1071 | put_page(xdp_page); | |
1072 | goto err_xdp; | |
1073 | } | |
2471c75e | 1074 | *xdp_xmit |= VIRTIO_XDP_TX; |
72979a6c | 1075 | if (unlikely(xdp_page != page)) |
5d458a13 | 1076 | put_page(page); |
56434a01 JF |
1077 | rcu_read_unlock(); |
1078 | goto xdp_xmit; | |
3cc81a9a | 1079 | case XDP_REDIRECT: |
d46eeeaf | 1080 | stats->xdp_redirects++; |
3cc81a9a JW |
1081 | err = xdp_do_redirect(dev, &xdp, xdp_prog); |
1082 | if (err) { | |
1083 | if (unlikely(xdp_page != page)) | |
1084 | put_page(xdp_page); | |
1085 | goto err_xdp; | |
1086 | } | |
2471c75e | 1087 | *xdp_xmit |= VIRTIO_XDP_REDIR; |
3cc81a9a | 1088 | if (unlikely(xdp_page != page)) |
6890418b | 1089 | put_page(page); |
3cc81a9a JW |
1090 | rcu_read_unlock(); |
1091 | goto xdp_xmit; | |
56434a01 | 1092 | default: |
c8064e5b | 1093 | bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act); |
df561f66 | 1094 | fallthrough; |
0354e4d1 JF |
1095 | case XDP_ABORTED: |
1096 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
df561f66 | 1097 | fallthrough; |
0354e4d1 | 1098 | case XDP_DROP: |
72979a6c JF |
1099 | if (unlikely(xdp_page != page)) |
1100 | __free_pages(xdp_page, 0); | |
f600b690 | 1101 | goto err_xdp; |
56434a01 | 1102 | } |
f600b690 JF |
1103 | } |
1104 | rcu_read_unlock(); | |
ab7db917 | 1105 | |
6213f07c | 1106 | skip_xdp: |
503d539a | 1107 | head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog, |
c32325b8 | 1108 | metasize, headroom); |
f600b690 | 1109 | curr_skb = head_skb; |
9ab86bbc | 1110 | |
8fc3b9e9 MT |
1111 | if (unlikely(!curr_skb)) |
1112 | goto err_skb; | |
9ab86bbc | 1113 | while (--num_buf) { |
8fc3b9e9 MT |
1114 | int num_skb_frags; |
1115 | ||
680557cf | 1116 | buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); |
03e9f8a0 | 1117 | if (unlikely(!buf)) { |
8fc3b9e9 | 1118 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
fdd819b2 | 1119 | dev->name, num_buf, |
012873d0 MT |
1120 | virtio16_to_cpu(vi->vdev, |
1121 | hdr->num_buffers)); | |
8fc3b9e9 MT |
1122 | dev->stats.rx_length_errors++; |
1123 | goto err_buf; | |
3f2c31d9 | 1124 | } |
8fc3b9e9 | 1125 | |
d46eeeaf | 1126 | stats->bytes += len; |
8fc3b9e9 | 1127 | page = virt_to_head_page(buf); |
28b39bc7 JW |
1128 | |
1129 | truesize = mergeable_ctx_to_truesize(ctx); | |
1130 | if (unlikely(len > truesize)) { | |
56da5fd0 | 1131 | pr_debug("%s: rx error: len %u exceeds truesize %lu\n", |
680557cf MT |
1132 | dev->name, len, (unsigned long)ctx); |
1133 | dev->stats.rx_length_errors++; | |
1134 | goto err_skb; | |
1135 | } | |
8fc3b9e9 MT |
1136 | |
1137 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; | |
2613af0e MD |
1138 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
1139 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
8fc3b9e9 MT |
1140 | |
1141 | if (unlikely(!nskb)) | |
1142 | goto err_skb; | |
2613af0e MD |
1143 | if (curr_skb == head_skb) |
1144 | skb_shinfo(curr_skb)->frag_list = nskb; | |
1145 | else | |
1146 | curr_skb->next = nskb; | |
1147 | curr_skb = nskb; | |
1148 | head_skb->truesize += nskb->truesize; | |
1149 | num_skb_frags = 0; | |
1150 | } | |
1151 | if (curr_skb != head_skb) { | |
1152 | head_skb->data_len += len; | |
1153 | head_skb->len += len; | |
fb51879d | 1154 | head_skb->truesize += truesize; |
2613af0e | 1155 | } |
8fc3b9e9 | 1156 | offset = buf - page_address(page); |
ba275241 JW |
1157 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
1158 | put_page(page); | |
1159 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
fb51879d | 1160 | len, truesize); |
ba275241 JW |
1161 | } else { |
1162 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
fb51879d | 1163 | offset, len, truesize); |
ba275241 | 1164 | } |
8fc3b9e9 MT |
1165 | } |
1166 | ||
5377d758 | 1167 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); |
8fc3b9e9 MT |
1168 | return head_skb; |
1169 | ||
f600b690 JF |
1170 | err_xdp: |
1171 | rcu_read_unlock(); | |
d46eeeaf | 1172 | stats->xdp_drops++; |
8fc3b9e9 MT |
1173 | err_skb: |
1174 | put_page(page); | |
850e088d | 1175 | while (num_buf-- > 1) { |
680557cf MT |
1176 | buf = virtqueue_get_buf(rq->vq, &len); |
1177 | if (unlikely(!buf)) { | |
8fc3b9e9 MT |
1178 | pr_debug("%s: rx error: %d buffers missing\n", |
1179 | dev->name, num_buf); | |
1180 | dev->stats.rx_length_errors++; | |
1181 | break; | |
1182 | } | |
d46eeeaf | 1183 | stats->bytes += len; |
680557cf | 1184 | page = virt_to_head_page(buf); |
8fc3b9e9 | 1185 | put_page(page); |
9ab86bbc | 1186 | } |
8fc3b9e9 | 1187 | err_buf: |
d46eeeaf | 1188 | stats->drops++; |
8fc3b9e9 | 1189 | dev_kfree_skb(head_skb); |
56434a01 | 1190 | xdp_xmit: |
8fc3b9e9 | 1191 | return NULL; |
9ab86bbc SM |
1192 | } |
1193 | ||
91f41f01 AM |
1194 | static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash, |
1195 | struct sk_buff *skb) | |
1196 | { | |
1197 | enum pkt_hash_types rss_hash_type; | |
1198 | ||
1199 | if (!hdr_hash || !skb) | |
1200 | return; | |
1201 | ||
1202 | switch ((int)hdr_hash->hash_report) { | |
1203 | case VIRTIO_NET_HASH_REPORT_TCPv4: | |
1204 | case VIRTIO_NET_HASH_REPORT_UDPv4: | |
1205 | case VIRTIO_NET_HASH_REPORT_TCPv6: | |
1206 | case VIRTIO_NET_HASH_REPORT_UDPv6: | |
1207 | case VIRTIO_NET_HASH_REPORT_TCPv6_EX: | |
1208 | case VIRTIO_NET_HASH_REPORT_UDPv6_EX: | |
1209 | rss_hash_type = PKT_HASH_TYPE_L4; | |
1210 | break; | |
1211 | case VIRTIO_NET_HASH_REPORT_IPv4: | |
1212 | case VIRTIO_NET_HASH_REPORT_IPv6: | |
1213 | case VIRTIO_NET_HASH_REPORT_IPv6_EX: | |
1214 | rss_hash_type = PKT_HASH_TYPE_L3; | |
1215 | break; | |
1216 | case VIRTIO_NET_HASH_REPORT_NONE: | |
1217 | default: | |
1218 | rss_hash_type = PKT_HASH_TYPE_NONE; | |
1219 | } | |
1220 | skb_set_hash(skb, (unsigned int)hdr_hash->hash_value, rss_hash_type); | |
1221 | } | |
1222 | ||
7d9d60fd TM |
1223 | static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
1224 | void *buf, unsigned int len, void **ctx, | |
a0929a44 | 1225 | unsigned int *xdp_xmit, |
d46eeeaf | 1226 | struct virtnet_rq_stats *stats) |
9ab86bbc | 1227 | { |
e9d7417b | 1228 | struct net_device *dev = vi->dev; |
9ab86bbc | 1229 | struct sk_buff *skb; |
012873d0 | 1230 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
3f2c31d9 | 1231 | |
bcff3162 | 1232 | if (unlikely(len < vi->hdr_len + ETH_HLEN)) { |
9ab86bbc SM |
1233 | pr_debug("%s: short packet %i\n", dev->name, len); |
1234 | dev->stats.rx_length_errors++; | |
ab7db917 | 1235 | if (vi->mergeable_rx_bufs) { |
680557cf | 1236 | put_page(virt_to_head_page(buf)); |
ab7db917 | 1237 | } else if (vi->big_packets) { |
98bfd23c | 1238 | give_pages(rq, buf); |
ab7db917 | 1239 | } else { |
f6b10209 | 1240 | put_page(virt_to_head_page(buf)); |
ab7db917 | 1241 | } |
7d9d60fd | 1242 | return; |
9ab86bbc | 1243 | } |
3f2c31d9 | 1244 | |
f121159d | 1245 | if (vi->mergeable_rx_bufs) |
7d9d60fd | 1246 | skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, |
a0929a44 | 1247 | stats); |
f121159d | 1248 | else if (vi->big_packets) |
a0929a44 | 1249 | skb = receive_big(dev, vi, rq, buf, len, stats); |
f121159d | 1250 | else |
a0929a44 | 1251 | skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); |
f121159d MT |
1252 | |
1253 | if (unlikely(!skb)) | |
7d9d60fd | 1254 | return; |
3f2c31d9 | 1255 | |
9ab86bbc | 1256 | hdr = skb_vnet_hdr(skb); |
91f41f01 AM |
1257 | if (dev->features & NETIF_F_RXHASH && vi->has_rss_hash_report) |
1258 | virtio_skb_set_hash((const struct virtio_net_hdr_v1_hash *)hdr, skb); | |
3fa2a1df | 1259 | |
e858fae2 | 1260 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) |
10a8d94a | 1261 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
296f96fc | 1262 | |
e858fae2 MR |
1263 | if (virtio_net_hdr_to_skb(skb, &hdr->hdr, |
1264 | virtio_is_little_endian(vi->vdev))) { | |
1265 | net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", | |
1266 | dev->name, hdr->hdr.gso_type, | |
1267 | hdr->hdr.gso_size); | |
1268 | goto frame_err; | |
296f96fc RR |
1269 | } |
1270 | ||
133bbb18 | 1271 | skb_record_rx_queue(skb, vq2rxq(rq->vq)); |
d1dc06dc MR |
1272 | skb->protocol = eth_type_trans(skb, dev); |
1273 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
1274 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
1275 | ||
0fbd050a | 1276 | napi_gro_receive(&rq->napi, skb); |
7d9d60fd | 1277 | return; |
296f96fc RR |
1278 | |
1279 | frame_err: | |
1280 | dev->stats.rx_frame_errors++; | |
296f96fc RR |
1281 | dev_kfree_skb(skb); |
1282 | } | |
1283 | ||
192f68cf JW |
1284 | /* Unlike mergeable buffers, all buffers are allocated to the |
1285 | * same size, except for the headroom. For this reason we do | |
1286 | * not need to use mergeable_len_to_ctx here - it is enough | |
1287 | * to store the headroom as the context ignoring the truesize. | |
1288 | */ | |
946fa564 MT |
1289 | static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
1290 | gfp_t gfp) | |
296f96fc | 1291 | { |
f6b10209 JW |
1292 | struct page_frag *alloc_frag = &rq->alloc_frag; |
1293 | char *buf; | |
2de2f7f4 | 1294 | unsigned int xdp_headroom = virtnet_get_headroom(vi); |
192f68cf | 1295 | void *ctx = (void *)(unsigned long)xdp_headroom; |
f6b10209 | 1296 | int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; |
9ab86bbc | 1297 | int err; |
3f2c31d9 | 1298 | |
f6b10209 JW |
1299 | len = SKB_DATA_ALIGN(len) + |
1300 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
1301 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) | |
9ab86bbc | 1302 | return -ENOMEM; |
296f96fc | 1303 | |
f6b10209 JW |
1304 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
1305 | get_page(alloc_frag->page); | |
1306 | alloc_frag->offset += len; | |
1307 | sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, | |
1308 | vi->hdr_len + GOOD_PACKET_LEN); | |
192f68cf | 1309 | err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); |
9ab86bbc | 1310 | if (err < 0) |
f6b10209 | 1311 | put_page(virt_to_head_page(buf)); |
9ab86bbc SM |
1312 | return err; |
1313 | } | |
97402b96 | 1314 | |
012873d0 MT |
1315 | static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, |
1316 | gfp_t gfp) | |
9ab86bbc | 1317 | { |
9ab86bbc SM |
1318 | struct page *first, *list = NULL; |
1319 | char *p; | |
1320 | int i, err, offset; | |
1321 | ||
a5835440 RR |
1322 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
1323 | ||
e9d7417b | 1324 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 1325 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 1326 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
1327 | if (!first) { |
1328 | if (list) | |
e9d7417b | 1329 | give_pages(rq, list); |
9ab86bbc | 1330 | return -ENOMEM; |
97402b96 | 1331 | } |
e9d7417b | 1332 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 1333 | |
9ab86bbc SM |
1334 | /* chain new page in list head to match sg */ |
1335 | first->private = (unsigned long)list; | |
1336 | list = first; | |
1337 | } | |
296f96fc | 1338 | |
e9d7417b | 1339 | first = get_a_page(rq, gfp); |
9ab86bbc | 1340 | if (!first) { |
e9d7417b | 1341 | give_pages(rq, list); |
9ab86bbc SM |
1342 | return -ENOMEM; |
1343 | } | |
1344 | p = page_address(first); | |
1345 | ||
e9d7417b | 1346 | /* rq->sg[0], rq->sg[1] share the same page */ |
012873d0 MT |
1347 | /* a separated rq->sg[0] for header - required in case !any_header_sg */ |
1348 | sg_set_buf(&rq->sg[0], p, vi->hdr_len); | |
9ab86bbc | 1349 | |
e9d7417b | 1350 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 1351 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 1352 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
1353 | |
1354 | /* chain first in list head */ | |
1355 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
1356 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
1357 | first, gfp); | |
9ab86bbc | 1358 | if (err < 0) |
e9d7417b | 1359 | give_pages(rq, first); |
9ab86bbc SM |
1360 | |
1361 | return err; | |
296f96fc RR |
1362 | } |
1363 | ||
d85b758f | 1364 | static unsigned int get_mergeable_buf_len(struct receive_queue *rq, |
3cc81a9a JW |
1365 | struct ewma_pkt_len *avg_pkt_len, |
1366 | unsigned int room) | |
3f2c31d9 | 1367 | { |
c1ddc42d AM |
1368 | struct virtnet_info *vi = rq->vq->vdev->priv; |
1369 | const size_t hdr_len = vi->hdr_len; | |
fbf28d78 MD |
1370 | unsigned int len; |
1371 | ||
3cc81a9a JW |
1372 | if (room) |
1373 | return PAGE_SIZE - room; | |
1374 | ||
1375 | len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), | |
f0c3192c | 1376 | rq->min_buf_len, PAGE_SIZE - hdr_len); |
3cc81a9a | 1377 | |
e377fcc8 | 1378 | return ALIGN(len, L1_CACHE_BYTES); |
fbf28d78 MD |
1379 | } |
1380 | ||
2de2f7f4 JF |
1381 | static int add_recvbuf_mergeable(struct virtnet_info *vi, |
1382 | struct receive_queue *rq, gfp_t gfp) | |
fbf28d78 | 1383 | { |
fb51879d | 1384 | struct page_frag *alloc_frag = &rq->alloc_frag; |
2de2f7f4 | 1385 | unsigned int headroom = virtnet_get_headroom(vi); |
3cc81a9a JW |
1386 | unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; |
1387 | unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); | |
fb51879d | 1388 | char *buf; |
680557cf | 1389 | void *ctx; |
3f2c31d9 | 1390 | int err; |
fb51879d | 1391 | unsigned int len, hole; |
3f2c31d9 | 1392 | |
3cc81a9a JW |
1393 | /* Extra tailroom is needed to satisfy XDP's assumption. This |
1394 | * means rx frags coalescing won't work, but consider we've | |
1395 | * disabled GSO for XDP, it won't be a big issue. | |
1396 | */ | |
1397 | len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); | |
1398 | if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) | |
9ab86bbc | 1399 | return -ENOMEM; |
ab7db917 | 1400 | |
fb51879d | 1401 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
2de2f7f4 | 1402 | buf += headroom; /* advance address leaving hole at front of pkt */ |
fb51879d | 1403 | get_page(alloc_frag->page); |
3cc81a9a | 1404 | alloc_frag->offset += len + room; |
fb51879d | 1405 | hole = alloc_frag->size - alloc_frag->offset; |
3cc81a9a | 1406 | if (hole < len + room) { |
ab7db917 MD |
1407 | /* To avoid internal fragmentation, if there is very likely not |
1408 | * enough space for another buffer, add the remaining space to | |
1daa8790 | 1409 | * the current buffer. |
ab7db917 | 1410 | */ |
fb51879d MD |
1411 | len += hole; |
1412 | alloc_frag->offset += hole; | |
1413 | } | |
3f2c31d9 | 1414 | |
fb51879d | 1415 | sg_init_one(rq->sg, buf, len); |
29fda25a | 1416 | ctx = mergeable_len_to_ctx(len, headroom); |
680557cf | 1417 | err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); |
9ab86bbc | 1418 | if (err < 0) |
2613af0e | 1419 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 1420 | |
9ab86bbc SM |
1421 | return err; |
1422 | } | |
3f2c31d9 | 1423 | |
b2baed69 RR |
1424 | /* |
1425 | * Returns false if we couldn't fill entirely (OOM). | |
1426 | * | |
1427 | * Normally run in the receive path, but can also be run from ndo_open | |
1428 | * before we're receiving packets, or from refill_work which is | |
1429 | * careful to disable receiving (using napi_disable). | |
1430 | */ | |
946fa564 MT |
1431 | static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, |
1432 | gfp_t gfp) | |
9ab86bbc SM |
1433 | { |
1434 | int err; | |
1788f495 | 1435 | bool oom; |
3f2c31d9 | 1436 | |
9ab86bbc SM |
1437 | do { |
1438 | if (vi->mergeable_rx_bufs) | |
2de2f7f4 | 1439 | err = add_recvbuf_mergeable(vi, rq, gfp); |
9ab86bbc | 1440 | else if (vi->big_packets) |
012873d0 | 1441 | err = add_recvbuf_big(vi, rq, gfp); |
9ab86bbc | 1442 | else |
946fa564 | 1443 | err = add_recvbuf_small(vi, rq, gfp); |
3f2c31d9 | 1444 | |
1788f495 | 1445 | oom = err == -ENOMEM; |
9ed4cb07 | 1446 | if (err) |
3f2c31d9 | 1447 | break; |
b7dfde95 | 1448 | } while (rq->vq->num_free); |
461f03dc | 1449 | if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { |
01c32598 MT |
1450 | unsigned long flags; |
1451 | ||
1452 | flags = u64_stats_update_begin_irqsave(&rq->stats.syncp); | |
d46eeeaf | 1453 | rq->stats.kicks++; |
01c32598 | 1454 | u64_stats_update_end_irqrestore(&rq->stats.syncp, flags); |
461f03dc TM |
1455 | } |
1456 | ||
3161e453 | 1457 | return !oom; |
3f2c31d9 MM |
1458 | } |
1459 | ||
18445c4d | 1460 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
1461 | { |
1462 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 1463 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 1464 | |
e4e8452a | 1465 | virtqueue_napi_schedule(&rq->napi, rvq); |
296f96fc RR |
1466 | } |
1467 | ||
e4e8452a | 1468 | static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) |
3e9d08ec | 1469 | { |
e4e8452a | 1470 | napi_enable(napi); |
3e9d08ec BR |
1471 | |
1472 | /* If all buffers were filled by other side before we napi_enabled, we | |
e4e8452a WB |
1473 | * won't get another interrupt, so process any outstanding packets now. |
1474 | * Call local_bh_enable after to trigger softIRQ processing. | |
1475 | */ | |
1476 | local_bh_disable(); | |
1477 | virtqueue_napi_schedule(napi, vq); | |
1478 | local_bh_enable(); | |
3e9d08ec BR |
1479 | } |
1480 | ||
b92f1e67 WB |
1481 | static void virtnet_napi_tx_enable(struct virtnet_info *vi, |
1482 | struct virtqueue *vq, | |
1483 | struct napi_struct *napi) | |
1484 | { | |
1485 | if (!napi->weight) | |
1486 | return; | |
1487 | ||
1488 | /* Tx napi touches cachelines on the cpu handling tx interrupts. Only | |
1489 | * enable the feature if this is likely affine with the transmit path. | |
1490 | */ | |
1491 | if (!vi->affinity_hint_set) { | |
1492 | napi->weight = 0; | |
1493 | return; | |
1494 | } | |
1495 | ||
1496 | return virtnet_napi_enable(vq, napi); | |
1497 | } | |
1498 | ||
78a57b48 WB |
1499 | static void virtnet_napi_tx_disable(struct napi_struct *napi) |
1500 | { | |
1501 | if (napi->weight) | |
1502 | napi_disable(napi); | |
1503 | } | |
1504 | ||
3161e453 RR |
1505 | static void refill_work(struct work_struct *work) |
1506 | { | |
e9d7417b JW |
1507 | struct virtnet_info *vi = |
1508 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 1509 | bool still_empty; |
986a4f4d JW |
1510 | int i; |
1511 | ||
55257d72 | 1512 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 1513 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 1514 | |
986a4f4d | 1515 | napi_disable(&rq->napi); |
946fa564 | 1516 | still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); |
e4e8452a | 1517 | virtnet_napi_enable(rq->vq, &rq->napi); |
3161e453 | 1518 | |
986a4f4d JW |
1519 | /* In theory, this can happen: if we don't get any buffers in |
1520 | * we will *never* try to fill again. | |
1521 | */ | |
1522 | if (still_empty) | |
1523 | schedule_delayed_work(&vi->refill, HZ/2); | |
1524 | } | |
3161e453 RR |
1525 | } |
1526 | ||
2471c75e JDB |
1527 | static int virtnet_receive(struct receive_queue *rq, int budget, |
1528 | unsigned int *xdp_xmit) | |
296f96fc | 1529 | { |
e9d7417b | 1530 | struct virtnet_info *vi = rq->vq->vdev->priv; |
d46eeeaf | 1531 | struct virtnet_rq_stats stats = {}; |
a0929a44 | 1532 | unsigned int len; |
9ab86bbc | 1533 | void *buf; |
a0929a44 | 1534 | int i; |
296f96fc | 1535 | |
192f68cf | 1536 | if (!vi->big_packets || vi->mergeable_rx_bufs) { |
680557cf MT |
1537 | void *ctx; |
1538 | ||
d46eeeaf | 1539 | while (stats.packets < budget && |
680557cf | 1540 | (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { |
a0929a44 | 1541 | receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); |
d46eeeaf | 1542 | stats.packets++; |
680557cf MT |
1543 | } |
1544 | } else { | |
d46eeeaf | 1545 | while (stats.packets < budget && |
680557cf | 1546 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
a0929a44 | 1547 | receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); |
d46eeeaf | 1548 | stats.packets++; |
680557cf | 1549 | } |
296f96fc RR |
1550 | } |
1551 | ||
718be6ba | 1552 | if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { |
5a159128 JW |
1553 | if (!try_fill_recv(vi, rq, GFP_ATOMIC)) { |
1554 | spin_lock(&vi->refill_lock); | |
1555 | if (vi->refill_enabled) | |
1556 | schedule_delayed_work(&vi->refill, 0); | |
1557 | spin_unlock(&vi->refill_lock); | |
1558 | } | |
3161e453 | 1559 | } |
296f96fc | 1560 | |
d7dfc5cf | 1561 | u64_stats_update_begin(&rq->stats.syncp); |
a0929a44 TM |
1562 | for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { |
1563 | size_t offset = virtnet_rq_stats_desc[i].offset; | |
1564 | u64 *item; | |
1565 | ||
d46eeeaf JW |
1566 | item = (u64 *)((u8 *)&rq->stats + offset); |
1567 | *item += *(u64 *)((u8 *)&stats + offset); | |
a0929a44 | 1568 | } |
d7dfc5cf | 1569 | u64_stats_update_end(&rq->stats.syncp); |
61845d20 | 1570 | |
d46eeeaf | 1571 | return stats.packets; |
2ffa7598 JW |
1572 | } |
1573 | ||
df133f3f | 1574 | static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi) |
ea7735d9 | 1575 | { |
ea7735d9 | 1576 | unsigned int len; |
ea7735d9 WB |
1577 | unsigned int packets = 0; |
1578 | unsigned int bytes = 0; | |
5050471d | 1579 | void *ptr; |
ea7735d9 | 1580 | |
5050471d TM |
1581 | while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
1582 | if (likely(!is_xdp_frame(ptr))) { | |
1583 | struct sk_buff *skb = ptr; | |
ea7735d9 | 1584 | |
5050471d | 1585 | pr_debug("Sent skb %p\n", skb); |
ea7735d9 | 1586 | |
5050471d TM |
1587 | bytes += skb->len; |
1588 | napi_consume_skb(skb, in_napi); | |
1589 | } else { | |
1590 | struct xdp_frame *frame = ptr_to_xdp(ptr); | |
ea7735d9 | 1591 | |
5050471d TM |
1592 | bytes += frame->len; |
1593 | xdp_return_frame(frame); | |
1594 | } | |
1595 | packets++; | |
ea7735d9 WB |
1596 | } |
1597 | ||
1598 | /* Avoid overhead when no packets have been processed | |
1599 | * happens when called speculatively from start_xmit. | |
1600 | */ | |
1601 | if (!packets) | |
1602 | return; | |
1603 | ||
d7dfc5cf TM |
1604 | u64_stats_update_begin(&sq->stats.syncp); |
1605 | sq->stats.bytes += bytes; | |
1606 | sq->stats.packets += packets; | |
1607 | u64_stats_update_end(&sq->stats.syncp); | |
ea7735d9 WB |
1608 | } |
1609 | ||
534da5e8 TM |
1610 | static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) |
1611 | { | |
1612 | if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) | |
1613 | return false; | |
1614 | else if (q < vi->curr_queue_pairs) | |
1615 | return true; | |
1616 | else | |
1617 | return false; | |
1618 | } | |
1619 | ||
7b0411ef WB |
1620 | static void virtnet_poll_cleantx(struct receive_queue *rq) |
1621 | { | |
1622 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
1623 | unsigned int index = vq2rxq(rq->vq); | |
1624 | struct send_queue *sq = &vi->sq[index]; | |
1625 | struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); | |
1626 | ||
534da5e8 | 1627 | if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index)) |
7b0411ef WB |
1628 | return; |
1629 | ||
1630 | if (__netif_tx_trylock(txq)) { | |
a7766ef1 MT |
1631 | do { |
1632 | virtqueue_disable_cb(sq->vq); | |
1633 | free_old_xmit_skbs(sq, true); | |
1634 | } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq))); | |
22bc63c5 MT |
1635 | |
1636 | if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) | |
1637 | netif_tx_wake_queue(txq); | |
1638 | ||
7b0411ef WB |
1639 | __netif_tx_unlock(txq); |
1640 | } | |
7b0411ef WB |
1641 | } |
1642 | ||
2ffa7598 JW |
1643 | static int virtnet_poll(struct napi_struct *napi, int budget) |
1644 | { | |
1645 | struct receive_queue *rq = | |
1646 | container_of(napi, struct receive_queue, napi); | |
9267c430 JW |
1647 | struct virtnet_info *vi = rq->vq->vdev->priv; |
1648 | struct send_queue *sq; | |
2a43565c | 1649 | unsigned int received; |
2471c75e | 1650 | unsigned int xdp_xmit = 0; |
2ffa7598 | 1651 | |
7b0411ef WB |
1652 | virtnet_poll_cleantx(rq); |
1653 | ||
186b3c99 | 1654 | received = virtnet_receive(rq, budget, &xdp_xmit); |
2ffa7598 | 1655 | |
8329d98e | 1656 | /* Out of packets? */ |
e4e8452a WB |
1657 | if (received < budget) |
1658 | virtqueue_napi_complete(napi, rq->vq, received); | |
296f96fc | 1659 | |
2471c75e | 1660 | if (xdp_xmit & VIRTIO_XDP_REDIR) |
1d233886 | 1661 | xdp_do_flush(); |
2471c75e JDB |
1662 | |
1663 | if (xdp_xmit & VIRTIO_XDP_TX) { | |
97c2c69e | 1664 | sq = virtnet_xdp_get_sq(vi); |
461f03dc TM |
1665 | if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { |
1666 | u64_stats_update_begin(&sq->stats.syncp); | |
1667 | sq->stats.kicks++; | |
1668 | u64_stats_update_end(&sq->stats.syncp); | |
1669 | } | |
97c2c69e | 1670 | virtnet_xdp_put_sq(vi, sq); |
9267c430 | 1671 | } |
186b3c99 | 1672 | |
296f96fc RR |
1673 | return received; |
1674 | } | |
1675 | ||
986a4f4d JW |
1676 | static int virtnet_open(struct net_device *dev) |
1677 | { | |
1678 | struct virtnet_info *vi = netdev_priv(dev); | |
754b8a21 | 1679 | int i, err; |
986a4f4d | 1680 | |
5a159128 JW |
1681 | enable_delayed_refill(vi); |
1682 | ||
e4166625 JW |
1683 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1684 | if (i < vi->curr_queue_pairs) | |
1685 | /* Make sure we have some buffers: if oom use wq. */ | |
946fa564 | 1686 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
e4166625 | 1687 | schedule_delayed_work(&vi->refill, 0); |
754b8a21 | 1688 | |
b02e5a0e | 1689 | err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id); |
754b8a21 JDB |
1690 | if (err < 0) |
1691 | return err; | |
1692 | ||
8d5d8852 JDB |
1693 | err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq, |
1694 | MEM_TYPE_PAGE_SHARED, NULL); | |
1695 | if (err < 0) { | |
1696 | xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); | |
1697 | return err; | |
1698 | } | |
1699 | ||
e4e8452a | 1700 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
b92f1e67 | 1701 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); |
986a4f4d JW |
1702 | } |
1703 | ||
1704 | return 0; | |
1705 | } | |
1706 | ||
b92f1e67 WB |
1707 | static int virtnet_poll_tx(struct napi_struct *napi, int budget) |
1708 | { | |
1709 | struct send_queue *sq = container_of(napi, struct send_queue, napi); | |
1710 | struct virtnet_info *vi = sq->vq->vdev->priv; | |
534da5e8 TM |
1711 | unsigned int index = vq2txq(sq->vq); |
1712 | struct netdev_queue *txq; | |
5a2f966d MT |
1713 | int opaque; |
1714 | bool done; | |
b92f1e67 | 1715 | |
534da5e8 TM |
1716 | if (unlikely(is_xdp_raw_buffer_queue(vi, index))) { |
1717 | /* We don't need to enable cb for XDP */ | |
1718 | napi_complete_done(napi, 0); | |
1719 | return 0; | |
1720 | } | |
1721 | ||
1722 | txq = netdev_get_tx_queue(vi->dev, index); | |
b92f1e67 | 1723 | __netif_tx_lock(txq, raw_smp_processor_id()); |
5a2f966d | 1724 | virtqueue_disable_cb(sq->vq); |
df133f3f | 1725 | free_old_xmit_skbs(sq, true); |
5a2f966d | 1726 | |
22bc63c5 MT |
1727 | if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) |
1728 | netif_tx_wake_queue(txq); | |
1729 | ||
5a2f966d MT |
1730 | opaque = virtqueue_enable_cb_prepare(sq->vq); |
1731 | ||
1732 | done = napi_complete_done(napi, 0); | |
1733 | ||
1734 | if (!done) | |
1735 | virtqueue_disable_cb(sq->vq); | |
1736 | ||
b92f1e67 WB |
1737 | __netif_tx_unlock(txq); |
1738 | ||
5a2f966d MT |
1739 | if (done) { |
1740 | if (unlikely(virtqueue_poll(sq->vq, opaque))) { | |
1741 | if (napi_schedule_prep(napi)) { | |
1742 | __netif_tx_lock(txq, raw_smp_processor_id()); | |
1743 | virtqueue_disable_cb(sq->vq); | |
1744 | __netif_tx_unlock(txq); | |
1745 | __napi_schedule(napi); | |
1746 | } | |
1747 | } | |
1748 | } | |
b92f1e67 | 1749 | |
b92f1e67 WB |
1750 | return 0; |
1751 | } | |
1752 | ||
e9d7417b | 1753 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 1754 | { |
012873d0 | 1755 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
296f96fc | 1756 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 1757 | struct virtnet_info *vi = sq->vq->vdev->priv; |
e2fcad58 | 1758 | int num_sg; |
012873d0 | 1759 | unsigned hdr_len = vi->hdr_len; |
e7428e95 | 1760 | bool can_push; |
296f96fc | 1761 | |
e174961c | 1762 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
1763 | |
1764 | can_push = vi->any_header_sg && | |
1765 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
1766 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
1767 | /* Even if we can, don't push here yet as this would skew | |
1768 | * csum_start offset below. */ | |
1769 | if (can_push) | |
012873d0 | 1770 | hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); |
e7428e95 MT |
1771 | else |
1772 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 1773 | |
e858fae2 | 1774 | if (virtio_net_hdr_from_skb(skb, &hdr->hdr, |
fd3a8862 WB |
1775 | virtio_is_little_endian(vi->vdev), false, |
1776 | 0)) | |
85eb1389 | 1777 | return -EPROTO; |
296f96fc | 1778 | |
3f2c31d9 | 1779 | if (vi->mergeable_rx_bufs) |
012873d0 | 1780 | hdr->num_buffers = 0; |
3f2c31d9 | 1781 | |
547c890c | 1782 | sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); |
e7428e95 MT |
1783 | if (can_push) { |
1784 | __skb_push(skb, hdr_len); | |
1785 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
e2fcad58 JD |
1786 | if (unlikely(num_sg < 0)) |
1787 | return num_sg; | |
e7428e95 MT |
1788 | /* Pull header back to avoid skew in tx bytes calculations. */ |
1789 | __skb_pull(skb, hdr_len); | |
1790 | } else { | |
1791 | sg_set_buf(sq->sg, hdr, hdr_len); | |
e2fcad58 JD |
1792 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); |
1793 | if (unlikely(num_sg < 0)) | |
1794 | return num_sg; | |
1795 | num_sg++; | |
e7428e95 | 1796 | } |
9dc7b9e4 | 1797 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
1798 | } |
1799 | ||
424efe9c | 1800 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
1801 | { |
1802 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
1803 | int qnum = skb_get_queue_mapping(skb); |
1804 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 1805 | int err; |
4b7fd2e6 | 1806 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
6b16f9ee | 1807 | bool kick = !netdev_xmit_more(); |
b92f1e67 | 1808 | bool use_napi = sq->napi.weight; |
2cb9c6ba | 1809 | |
2cb9c6ba | 1810 | /* Free up any pending old buffers before queueing new ones. */ |
a7766ef1 MT |
1811 | do { |
1812 | if (use_napi) | |
1813 | virtqueue_disable_cb(sq->vq); | |
1814 | ||
1815 | free_old_xmit_skbs(sq, false); | |
99ffc696 | 1816 | |
a7766ef1 MT |
1817 | } while (use_napi && kick && |
1818 | unlikely(!virtqueue_enable_cb_delayed(sq->vq))); | |
bdb12e0d | 1819 | |
074c3582 JK |
1820 | /* timestamp packet in software */ |
1821 | skb_tx_timestamp(skb); | |
1822 | ||
03f191ba | 1823 | /* Try to transmit */ |
b7dfde95 | 1824 | err = xmit_skb(sq, skb); |
48925e37 | 1825 | |
9ed4cb07 | 1826 | /* This should not happen! */ |
681daee2 | 1827 | if (unlikely(err)) { |
9ed4cb07 RR |
1828 | dev->stats.tx_fifo_errors++; |
1829 | if (net_ratelimit()) | |
1830 | dev_warn(&dev->dev, | |
7934b481 YS |
1831 | "Unexpected TXQ (%d) queue failure: %d\n", |
1832 | qnum, err); | |
58eba97d | 1833 | dev->stats.tx_dropped++; |
85e94525 | 1834 | dev_kfree_skb_any(skb); |
58eba97d | 1835 | return NETDEV_TX_OK; |
296f96fc | 1836 | } |
03f191ba | 1837 | |
48925e37 | 1838 | /* Don't wait up for transmitted skbs to be freed. */ |
b92f1e67 WB |
1839 | if (!use_napi) { |
1840 | skb_orphan(skb); | |
895b5c9f | 1841 | nf_reset_ct(skb); |
b92f1e67 | 1842 | } |
48925e37 | 1843 | |
60302ff6 MT |
1844 | /* If running out of space, stop queue to avoid getting packets that we |
1845 | * are then unable to transmit. | |
1846 | * An alternative would be to force queuing layer to requeue the skb by | |
1847 | * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be | |
1848 | * returned in a normal path of operation: it means that driver is not | |
1849 | * maintaining the TX queue stop/start state properly, and causes | |
1850 | * the stack to do a non-trivial amount of useless work. | |
1851 | * Since most packets only take 1 or 2 ring slots, stopping the queue | |
1852 | * early means 16 slots are typically wasted. | |
d631b94e | 1853 | */ |
b7dfde95 | 1854 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 1855 | netif_stop_subqueue(dev, qnum); |
b92f1e67 WB |
1856 | if (!use_napi && |
1857 | unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { | |
48925e37 | 1858 | /* More just got used, free them then recheck. */ |
df133f3f | 1859 | free_old_xmit_skbs(sq, false); |
b7dfde95 | 1860 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { |
986a4f4d | 1861 | netif_start_subqueue(dev, qnum); |
e9d7417b | 1862 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
1863 | } |
1864 | } | |
99ffc696 | 1865 | } |
48925e37 | 1866 | |
461f03dc TM |
1867 | if (kick || netif_xmit_stopped(txq)) { |
1868 | if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { | |
1869 | u64_stats_update_begin(&sq->stats.syncp); | |
1870 | sq->stats.kicks++; | |
1871 | u64_stats_update_end(&sq->stats.syncp); | |
1872 | } | |
1873 | } | |
296f96fc | 1874 | |
0b725a2c | 1875 | return NETDEV_TX_OK; |
c223a078 DM |
1876 | } |
1877 | ||
40cbfc37 AK |
1878 | /* |
1879 | * Send command via the control virtqueue and check status. Commands | |
1880 | * supported by the hypervisor, as indicated by feature bits, should | |
788a8b6d | 1881 | * never fail unless improperly formatted. |
40cbfc37 AK |
1882 | */ |
1883 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
d24bae32 | 1884 | struct scatterlist *out) |
40cbfc37 | 1885 | { |
f7bc9594 | 1886 | struct scatterlist *sgs[4], hdr, stat; |
d24bae32 | 1887 | unsigned out_num = 0, tmp; |
222722bc | 1888 | int ret; |
40cbfc37 AK |
1889 | |
1890 | /* Caller should know better */ | |
f7bc9594 | 1891 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 | 1892 | |
12e57169 MT |
1893 | vi->ctrl->status = ~0; |
1894 | vi->ctrl->hdr.class = class; | |
1895 | vi->ctrl->hdr.cmd = cmd; | |
f7bc9594 | 1896 | /* Add header */ |
12e57169 | 1897 | sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); |
f7bc9594 | 1898 | sgs[out_num++] = &hdr; |
40cbfc37 | 1899 | |
f7bc9594 RR |
1900 | if (out) |
1901 | sgs[out_num++] = out; | |
40cbfc37 | 1902 | |
f7bc9594 | 1903 | /* Add return status. */ |
12e57169 | 1904 | sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); |
d24bae32 | 1905 | sgs[out_num] = &stat; |
40cbfc37 | 1906 | |
d24bae32 | 1907 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
222722bc YW |
1908 | ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
1909 | if (ret < 0) { | |
1910 | dev_warn(&vi->vdev->dev, | |
1911 | "Failed to add sgs for command vq: %d\n.", ret); | |
1912 | return false; | |
1913 | } | |
40cbfc37 | 1914 | |
67975901 | 1915 | if (unlikely(!virtqueue_kick(vi->cvq))) |
12e57169 | 1916 | return vi->ctrl->status == VIRTIO_NET_OK; |
40cbfc37 AK |
1917 | |
1918 | /* Spin for a response, the kick causes an ioport write, trapping | |
1919 | * into the hypervisor, so the request should be handled immediately. | |
1920 | */ | |
047b9b94 HG |
1921 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
1922 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
1923 | cpu_relax(); |
1924 | ||
12e57169 | 1925 | return vi->ctrl->status == VIRTIO_NET_OK; |
40cbfc37 AK |
1926 | } |
1927 | ||
9c46f6d4 AW |
1928 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
1929 | { | |
1930 | struct virtnet_info *vi = netdev_priv(dev); | |
1931 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 1932 | int ret; |
e37e2ff3 | 1933 | struct sockaddr *addr; |
7e58d5ae | 1934 | struct scatterlist sg; |
9c46f6d4 | 1935 | |
ba5e4426 SS |
1936 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) |
1937 | return -EOPNOTSUPP; | |
1938 | ||
801822d1 | 1939 | addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); |
e37e2ff3 AL |
1940 | if (!addr) |
1941 | return -ENOMEM; | |
e37e2ff3 AL |
1942 | |
1943 | ret = eth_prepare_mac_addr_change(dev, addr); | |
f2f2c8b4 | 1944 | if (ret) |
e37e2ff3 | 1945 | goto out; |
9c46f6d4 | 1946 | |
7e58d5ae AK |
1947 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
1948 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
1949 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1950 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
7e58d5ae AK |
1951 | dev_warn(&vdev->dev, |
1952 | "Failed to set mac address by vq command.\n"); | |
e37e2ff3 AL |
1953 | ret = -EINVAL; |
1954 | goto out; | |
7e58d5ae | 1955 | } |
7e93a02f MT |
1956 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && |
1957 | !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
855e0c52 RR |
1958 | unsigned int i; |
1959 | ||
1960 | /* Naturally, this has an atomicity problem. */ | |
1961 | for (i = 0; i < dev->addr_len; i++) | |
1962 | virtio_cwrite8(vdev, | |
1963 | offsetof(struct virtio_net_config, mac) + | |
1964 | i, addr->sa_data[i]); | |
7e58d5ae AK |
1965 | } |
1966 | ||
1967 | eth_commit_mac_addr_change(dev, p); | |
e37e2ff3 | 1968 | ret = 0; |
9c46f6d4 | 1969 | |
e37e2ff3 AL |
1970 | out: |
1971 | kfree(addr); | |
1972 | return ret; | |
9c46f6d4 AW |
1973 | } |
1974 | ||
bc1f4470 | 1975 | static void virtnet_stats(struct net_device *dev, |
1976 | struct rtnl_link_stats64 *tot) | |
3fa2a1df | 1977 | { |
1978 | struct virtnet_info *vi = netdev_priv(dev); | |
3fa2a1df | 1979 | unsigned int start; |
d7dfc5cf | 1980 | int i; |
3fa2a1df | 1981 | |
d7dfc5cf | 1982 | for (i = 0; i < vi->max_queue_pairs; i++) { |
a520794b | 1983 | u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops; |
d7dfc5cf TM |
1984 | struct receive_queue *rq = &vi->rq[i]; |
1985 | struct send_queue *sq = &vi->sq[i]; | |
3fa2a1df | 1986 | |
1987 | do { | |
d7dfc5cf TM |
1988 | start = u64_stats_fetch_begin_irq(&sq->stats.syncp); |
1989 | tpackets = sq->stats.packets; | |
1990 | tbytes = sq->stats.bytes; | |
a520794b | 1991 | terrors = sq->stats.tx_timeouts; |
d7dfc5cf | 1992 | } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); |
83a27052 ED |
1993 | |
1994 | do { | |
d7dfc5cf | 1995 | start = u64_stats_fetch_begin_irq(&rq->stats.syncp); |
d46eeeaf JW |
1996 | rpackets = rq->stats.packets; |
1997 | rbytes = rq->stats.bytes; | |
1998 | rdrops = rq->stats.drops; | |
d7dfc5cf | 1999 | } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); |
3fa2a1df | 2000 | |
2001 | tot->rx_packets += rpackets; | |
2002 | tot->tx_packets += tpackets; | |
2003 | tot->rx_bytes += rbytes; | |
2004 | tot->tx_bytes += tbytes; | |
2c4a2f7d | 2005 | tot->rx_dropped += rdrops; |
a520794b | 2006 | tot->tx_errors += terrors; |
3fa2a1df | 2007 | } |
2008 | ||
2009 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 2010 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 2011 | tot->rx_length_errors = dev->stats.rx_length_errors; |
2012 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
3fa2a1df | 2013 | } |
2014 | ||
586d17c5 JW |
2015 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
2016 | { | |
2017 | rtnl_lock(); | |
2018 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
d24bae32 | 2019 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
586d17c5 JW |
2020 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
2021 | rtnl_unlock(); | |
2022 | } | |
2023 | ||
47315329 | 2024 | static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
986a4f4d JW |
2025 | { |
2026 | struct scatterlist sg; | |
986a4f4d JW |
2027 | struct net_device *dev = vi->dev; |
2028 | ||
2029 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
2030 | return 0; | |
2031 | ||
12e57169 MT |
2032 | vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
2033 | sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); | |
986a4f4d JW |
2034 | |
2035 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
d24bae32 | 2036 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
986a4f4d JW |
2037 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
2038 | queue_pairs); | |
2039 | return -EINVAL; | |
55257d72 | 2040 | } else { |
986a4f4d | 2041 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
2042 | /* virtnet_open() will refill when device is going to up. */ |
2043 | if (dev->flags & IFF_UP) | |
2044 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 2045 | } |
986a4f4d JW |
2046 | |
2047 | return 0; | |
2048 | } | |
2049 | ||
47315329 JF |
2050 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
2051 | { | |
2052 | int err; | |
2053 | ||
2054 | rtnl_lock(); | |
2055 | err = _virtnet_set_queues(vi, queue_pairs); | |
2056 | rtnl_unlock(); | |
2057 | return err; | |
2058 | } | |
2059 | ||
296f96fc RR |
2060 | static int virtnet_close(struct net_device *dev) |
2061 | { | |
2062 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 2063 | int i; |
296f96fc | 2064 | |
5a159128 JW |
2065 | /* Make sure NAPI doesn't schedule refill work */ |
2066 | disable_delayed_refill(vi); | |
b2baed69 RR |
2067 | /* Make sure refill_work doesn't re-enable napi! */ |
2068 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d | 2069 | |
b92f1e67 | 2070 | for (i = 0; i < vi->max_queue_pairs; i++) { |
754b8a21 | 2071 | xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); |
986a4f4d | 2072 | napi_disable(&vi->rq[i].napi); |
78a57b48 | 2073 | virtnet_napi_tx_disable(&vi->sq[i].napi); |
b92f1e67 | 2074 | } |
296f96fc | 2075 | |
296f96fc RR |
2076 | return 0; |
2077 | } | |
2078 | ||
2af7698e AW |
2079 | static void virtnet_set_rx_mode(struct net_device *dev) |
2080 | { | |
2081 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 2082 | struct scatterlist sg[2]; |
f565a7c2 | 2083 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 2084 | struct netdev_hw_addr *ha; |
32e7bfc4 | 2085 | int uc_count; |
4cd24eaf | 2086 | int mc_count; |
f565a7c2 AW |
2087 | void *buf; |
2088 | int i; | |
2af7698e | 2089 | |
788a8b6d | 2090 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
2af7698e AW |
2091 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
2092 | return; | |
2093 | ||
12e57169 MT |
2094 | vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); |
2095 | vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 2096 | |
12e57169 | 2097 | sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); |
2af7698e AW |
2098 | |
2099 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 2100 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
2af7698e | 2101 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
12e57169 | 2102 | vi->ctrl->promisc ? "en" : "dis"); |
2af7698e | 2103 | |
12e57169 | 2104 | sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); |
2af7698e AW |
2105 | |
2106 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 2107 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
2af7698e | 2108 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
12e57169 | 2109 | vi->ctrl->allmulti ? "en" : "dis"); |
f565a7c2 | 2110 | |
32e7bfc4 | 2111 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 2112 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 2113 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
2114 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
2115 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
2116 | mac_data = buf; | |
e68ed8f0 | 2117 | if (!buf) |
f565a7c2 | 2118 | return; |
f565a7c2 | 2119 | |
23e258e1 AW |
2120 | sg_init_table(sg, 2); |
2121 | ||
f565a7c2 | 2122 | /* Store the unicast list and count in the front of the buffer */ |
fdd819b2 | 2123 | mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); |
ccffad25 | 2124 | i = 0; |
32e7bfc4 | 2125 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 2126 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
2127 | |
2128 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 2129 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
2130 | |
2131 | /* multicast list and count fill the end */ | |
32e7bfc4 | 2132 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 2133 | |
fdd819b2 | 2134 | mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); |
567ec874 | 2135 | i = 0; |
22bedad3 JP |
2136 | netdev_for_each_mc_addr(ha, dev) |
2137 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
2138 | |
2139 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 2140 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
2141 | |
2142 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 2143 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
99e872ae | 2144 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
f565a7c2 AW |
2145 | |
2146 | kfree(buf); | |
2af7698e AW |
2147 | } |
2148 | ||
80d5c368 PM |
2149 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
2150 | __be16 proto, u16 vid) | |
0bde9569 AW |
2151 | { |
2152 | struct virtnet_info *vi = netdev_priv(dev); | |
2153 | struct scatterlist sg; | |
2154 | ||
d7fad4c8 | 2155 | vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); |
12e57169 | 2156 | sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); |
0bde9569 AW |
2157 | |
2158 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 2159 | VIRTIO_NET_CTRL_VLAN_ADD, &sg)) |
0bde9569 | 2160 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 2161 | return 0; |
0bde9569 AW |
2162 | } |
2163 | ||
80d5c368 PM |
2164 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
2165 | __be16 proto, u16 vid) | |
0bde9569 AW |
2166 | { |
2167 | struct virtnet_info *vi = netdev_priv(dev); | |
2168 | struct scatterlist sg; | |
2169 | ||
d7fad4c8 | 2170 | vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); |
12e57169 | 2171 | sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); |
0bde9569 AW |
2172 | |
2173 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 2174 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
0bde9569 | 2175 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 2176 | return 0; |
0bde9569 AW |
2177 | } |
2178 | ||
310974fa | 2179 | static void virtnet_clean_affinity(struct virtnet_info *vi) |
986a4f4d JW |
2180 | { |
2181 | int i; | |
2182 | ||
8898c21c WG |
2183 | if (vi->affinity_hint_set) { |
2184 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
19e226e8 CR |
2185 | virtqueue_set_affinity(vi->rq[i].vq, NULL); |
2186 | virtqueue_set_affinity(vi->sq[i].vq, NULL); | |
47be2479 WG |
2187 | } |
2188 | ||
8898c21c WG |
2189 | vi->affinity_hint_set = false; |
2190 | } | |
8898c21c | 2191 | } |
47be2479 | 2192 | |
8898c21c WG |
2193 | static void virtnet_set_affinity(struct virtnet_info *vi) |
2194 | { | |
2ca653d6 CR |
2195 | cpumask_var_t mask; |
2196 | int stragglers; | |
2197 | int group_size; | |
2198 | int i, j, cpu; | |
2199 | int num_cpu; | |
2200 | int stride; | |
2201 | ||
2202 | if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { | |
310974fa | 2203 | virtnet_clean_affinity(vi); |
8898c21c | 2204 | return; |
986a4f4d JW |
2205 | } |
2206 | ||
2ca653d6 CR |
2207 | num_cpu = num_online_cpus(); |
2208 | stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); | |
2209 | stragglers = num_cpu >= vi->curr_queue_pairs ? | |
2210 | num_cpu % vi->curr_queue_pairs : | |
2211 | 0; | |
9b51d9d8 | 2212 | cpu = cpumask_first(cpu_online_mask); |
4d99f660 | 2213 | |
2ca653d6 CR |
2214 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
2215 | group_size = stride + (i < stragglers ? 1 : 0); | |
2216 | ||
2217 | for (j = 0; j < group_size; j++) { | |
2218 | cpumask_set_cpu(cpu, mask); | |
2219 | cpu = cpumask_next_wrap(cpu, cpu_online_mask, | |
2220 | nr_cpu_ids, false); | |
2221 | } | |
2222 | virtqueue_set_affinity(vi->rq[i].vq, mask); | |
2223 | virtqueue_set_affinity(vi->sq[i].vq, mask); | |
044ab86d | 2224 | __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS); |
2ca653d6 | 2225 | cpumask_clear(mask); |
986a4f4d JW |
2226 | } |
2227 | ||
8898c21c | 2228 | vi->affinity_hint_set = true; |
2ca653d6 | 2229 | free_cpumask_var(mask); |
986a4f4d JW |
2230 | } |
2231 | ||
8017c279 | 2232 | static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) |
8de4b2f3 | 2233 | { |
8017c279 SAS |
2234 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, |
2235 | node); | |
2236 | virtnet_set_affinity(vi); | |
2237 | return 0; | |
2238 | } | |
8de4b2f3 | 2239 | |
8017c279 SAS |
2240 | static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) |
2241 | { | |
2242 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
2243 | node_dead); | |
2244 | virtnet_set_affinity(vi); | |
2245 | return 0; | |
2246 | } | |
3ab098df | 2247 | |
8017c279 SAS |
2248 | static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) |
2249 | { | |
2250 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
2251 | node); | |
2252 | ||
310974fa | 2253 | virtnet_clean_affinity(vi); |
8017c279 SAS |
2254 | return 0; |
2255 | } | |
2256 | ||
2257 | static enum cpuhp_state virtionet_online; | |
2258 | ||
2259 | static int virtnet_cpu_notif_add(struct virtnet_info *vi) | |
2260 | { | |
2261 | int ret; | |
2262 | ||
2263 | ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); | |
2264 | if (ret) | |
2265 | return ret; | |
2266 | ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
2267 | &vi->node_dead); | |
2268 | if (!ret) | |
2269 | return ret; | |
2270 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
2271 | return ret; | |
2272 | } | |
2273 | ||
2274 | static void virtnet_cpu_notif_remove(struct virtnet_info *vi) | |
2275 | { | |
2276 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
2277 | cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
2278 | &vi->node_dead); | |
986a4f4d JW |
2279 | } |
2280 | ||
8f9f4668 | 2281 | static void virtnet_get_ringparam(struct net_device *dev, |
74624944 HC |
2282 | struct ethtool_ringparam *ring, |
2283 | struct kernel_ethtool_ringparam *kernel_ring, | |
2284 | struct netlink_ext_ack *extack) | |
8f9f4668 RJ |
2285 | { |
2286 | struct virtnet_info *vi = netdev_priv(dev); | |
2287 | ||
986a4f4d JW |
2288 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
2289 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
2290 | ring->rx_pending = ring->rx_max_pending; |
2291 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
2292 | } |
2293 | ||
c7114b12 AM |
2294 | static bool virtnet_commit_rss_command(struct virtnet_info *vi) |
2295 | { | |
2296 | struct net_device *dev = vi->dev; | |
2297 | struct scatterlist sgs[4]; | |
2298 | unsigned int sg_buf_size; | |
2299 | ||
2300 | /* prepare sgs */ | |
2301 | sg_init_table(sgs, 4); | |
2302 | ||
2303 | sg_buf_size = offsetof(struct virtio_net_ctrl_rss, indirection_table); | |
2304 | sg_set_buf(&sgs[0], &vi->ctrl->rss, sg_buf_size); | |
2305 | ||
2306 | sg_buf_size = sizeof(uint16_t) * (vi->ctrl->rss.indirection_table_mask + 1); | |
2307 | sg_set_buf(&sgs[1], vi->ctrl->rss.indirection_table, sg_buf_size); | |
2308 | ||
2309 | sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key) | |
2310 | - offsetof(struct virtio_net_ctrl_rss, max_tx_vq); | |
2311 | sg_set_buf(&sgs[2], &vi->ctrl->rss.max_tx_vq, sg_buf_size); | |
2312 | ||
2313 | sg_buf_size = vi->rss_key_size; | |
2314 | sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size); | |
2315 | ||
2316 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
91f41f01 AM |
2317 | vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG |
2318 | : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) { | |
c7114b12 AM |
2319 | dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n"); |
2320 | return false; | |
2321 | } | |
2322 | return true; | |
2323 | } | |
2324 | ||
2325 | static void virtnet_init_default_rss(struct virtnet_info *vi) | |
2326 | { | |
2327 | u32 indir_val = 0; | |
2328 | int i = 0; | |
2329 | ||
2330 | vi->ctrl->rss.hash_types = vi->rss_hash_types_supported; | |
c1170820 | 2331 | vi->rss_hash_types_saved = vi->rss_hash_types_supported; |
c7114b12 AM |
2332 | vi->ctrl->rss.indirection_table_mask = vi->rss_indir_table_size |
2333 | ? vi->rss_indir_table_size - 1 : 0; | |
2334 | vi->ctrl->rss.unclassified_queue = 0; | |
2335 | ||
2336 | for (; i < vi->rss_indir_table_size; ++i) { | |
2337 | indir_val = ethtool_rxfh_indir_default(i, vi->curr_queue_pairs); | |
2338 | vi->ctrl->rss.indirection_table[i] = indir_val; | |
2339 | } | |
2340 | ||
2341 | vi->ctrl->rss.max_tx_vq = vi->curr_queue_pairs; | |
2342 | vi->ctrl->rss.hash_key_length = vi->rss_key_size; | |
2343 | ||
2344 | netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size); | |
2345 | } | |
2346 | ||
c1170820 AM |
2347 | static void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info) |
2348 | { | |
2349 | info->data = 0; | |
2350 | switch (info->flow_type) { | |
2351 | case TCP_V4_FLOW: | |
2352 | if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) { | |
2353 | info->data = RXH_IP_SRC | RXH_IP_DST | | |
2354 | RXH_L4_B_0_1 | RXH_L4_B_2_3; | |
2355 | } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { | |
2356 | info->data = RXH_IP_SRC | RXH_IP_DST; | |
2357 | } | |
2358 | break; | |
2359 | case TCP_V6_FLOW: | |
2360 | if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) { | |
2361 | info->data = RXH_IP_SRC | RXH_IP_DST | | |
2362 | RXH_L4_B_0_1 | RXH_L4_B_2_3; | |
2363 | } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { | |
2364 | info->data = RXH_IP_SRC | RXH_IP_DST; | |
2365 | } | |
2366 | break; | |
2367 | case UDP_V4_FLOW: | |
2368 | if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) { | |
2369 | info->data = RXH_IP_SRC | RXH_IP_DST | | |
2370 | RXH_L4_B_0_1 | RXH_L4_B_2_3; | |
2371 | } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { | |
2372 | info->data = RXH_IP_SRC | RXH_IP_DST; | |
2373 | } | |
2374 | break; | |
2375 | case UDP_V6_FLOW: | |
2376 | if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) { | |
2377 | info->data = RXH_IP_SRC | RXH_IP_DST | | |
2378 | RXH_L4_B_0_1 | RXH_L4_B_2_3; | |
2379 | } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { | |
2380 | info->data = RXH_IP_SRC | RXH_IP_DST; | |
2381 | } | |
2382 | break; | |
2383 | case IPV4_FLOW: | |
2384 | if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) | |
2385 | info->data = RXH_IP_SRC | RXH_IP_DST; | |
2386 | ||
2387 | break; | |
2388 | case IPV6_FLOW: | |
2389 | if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) | |
2390 | info->data = RXH_IP_SRC | RXH_IP_DST; | |
2391 | ||
2392 | break; | |
2393 | default: | |
2394 | info->data = 0; | |
2395 | break; | |
2396 | } | |
2397 | } | |
2398 | ||
2399 | static bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info) | |
2400 | { | |
2401 | u32 new_hashtypes = vi->rss_hash_types_saved; | |
2402 | bool is_disable = info->data & RXH_DISCARD; | |
2403 | bool is_l4 = info->data == (RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3); | |
2404 | ||
2405 | /* supports only 'sd', 'sdfn' and 'r' */ | |
2406 | if (!((info->data == (RXH_IP_SRC | RXH_IP_DST)) | is_l4 | is_disable)) | |
2407 | return false; | |
2408 | ||
2409 | switch (info->flow_type) { | |
2410 | case TCP_V4_FLOW: | |
2411 | new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4); | |
2412 | if (!is_disable) | |
2413 | new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 | |
2414 | | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0); | |
2415 | break; | |
2416 | case UDP_V4_FLOW: | |
2417 | new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_UDPv4); | |
2418 | if (!is_disable) | |
2419 | new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 | |
2420 | | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv4 : 0); | |
2421 | break; | |
2422 | case IPV4_FLOW: | |
2423 | new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4; | |
2424 | if (!is_disable) | |
2425 | new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv4; | |
2426 | break; | |
2427 | case TCP_V6_FLOW: | |
2428 | new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_TCPv6); | |
2429 | if (!is_disable) | |
2430 | new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 | |
2431 | | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv6 : 0); | |
2432 | break; | |
2433 | case UDP_V6_FLOW: | |
2434 | new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_UDPv6); | |
2435 | if (!is_disable) | |
2436 | new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 | |
2437 | | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv6 : 0); | |
2438 | break; | |
2439 | case IPV6_FLOW: | |
2440 | new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6; | |
2441 | if (!is_disable) | |
2442 | new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv6; | |
2443 | break; | |
2444 | default: | |
2445 | /* unsupported flow */ | |
2446 | return false; | |
2447 | } | |
2448 | ||
2449 | /* if unsupported hashtype was set */ | |
2450 | if (new_hashtypes != (new_hashtypes & vi->rss_hash_types_supported)) | |
2451 | return false; | |
2452 | ||
2453 | if (new_hashtypes != vi->rss_hash_types_saved) { | |
2454 | vi->rss_hash_types_saved = new_hashtypes; | |
2455 | vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; | |
2456 | if (vi->dev->features & NETIF_F_RXHASH) | |
2457 | return virtnet_commit_rss_command(vi); | |
2458 | } | |
2459 | ||
2460 | return true; | |
2461 | } | |
66846048 RJ |
2462 | |
2463 | static void virtnet_get_drvinfo(struct net_device *dev, | |
2464 | struct ethtool_drvinfo *info) | |
2465 | { | |
2466 | struct virtnet_info *vi = netdev_priv(dev); | |
2467 | struct virtio_device *vdev = vi->vdev; | |
2468 | ||
2469 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
2470 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
2471 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
2472 | ||
2473 | } | |
2474 | ||
d73bcd2c JW |
2475 | /* TODO: Eliminate OOO packets during switching */ |
2476 | static int virtnet_set_channels(struct net_device *dev, | |
2477 | struct ethtool_channels *channels) | |
2478 | { | |
2479 | struct virtnet_info *vi = netdev_priv(dev); | |
2480 | u16 queue_pairs = channels->combined_count; | |
2481 | int err; | |
2482 | ||
2483 | /* We don't support separate rx/tx channels. | |
2484 | * We don't allow setting 'other' channels. | |
2485 | */ | |
2486 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
2487 | return -EINVAL; | |
2488 | ||
c18e9cd6 | 2489 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
d73bcd2c JW |
2490 | return -EINVAL; |
2491 | ||
f600b690 JF |
2492 | /* For now we don't support modifying channels while XDP is loaded |
2493 | * also when XDP is loaded all RX queues have XDP programs so we only | |
2494 | * need to check a single RX queue. | |
2495 | */ | |
2496 | if (vi->rq[0].xdp_prog) | |
2497 | return -EINVAL; | |
2498 | ||
a0d1d0f4 | 2499 | cpus_read_lock(); |
47315329 | 2500 | err = _virtnet_set_queues(vi, queue_pairs); |
de33212f | 2501 | if (err) { |
a0d1d0f4 | 2502 | cpus_read_unlock(); |
de33212f | 2503 | goto err; |
d73bcd2c | 2504 | } |
de33212f | 2505 | virtnet_set_affinity(vi); |
a0d1d0f4 | 2506 | cpus_read_unlock(); |
d73bcd2c | 2507 | |
de33212f JD |
2508 | netif_set_real_num_tx_queues(dev, queue_pairs); |
2509 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
2510 | err: | |
d73bcd2c JW |
2511 | return err; |
2512 | } | |
2513 | ||
d7dfc5cf TM |
2514 | static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) |
2515 | { | |
2516 | struct virtnet_info *vi = netdev_priv(dev); | |
d7dfc5cf | 2517 | unsigned int i, j; |
d7a9a01b | 2518 | u8 *p = data; |
d7dfc5cf TM |
2519 | |
2520 | switch (stringset) { | |
2521 | case ETH_SS_STATS: | |
2522 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
d7a9a01b AD |
2523 | for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) |
2524 | ethtool_sprintf(&p, "rx_queue_%u_%s", i, | |
2525 | virtnet_rq_stats_desc[j].desc); | |
d7dfc5cf TM |
2526 | } |
2527 | ||
2528 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
d7a9a01b AD |
2529 | for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) |
2530 | ethtool_sprintf(&p, "tx_queue_%u_%s", i, | |
2531 | virtnet_sq_stats_desc[j].desc); | |
d7dfc5cf TM |
2532 | } |
2533 | break; | |
2534 | } | |
2535 | } | |
2536 | ||
2537 | static int virtnet_get_sset_count(struct net_device *dev, int sset) | |
2538 | { | |
2539 | struct virtnet_info *vi = netdev_priv(dev); | |
2540 | ||
2541 | switch (sset) { | |
2542 | case ETH_SS_STATS: | |
2543 | return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + | |
2544 | VIRTNET_SQ_STATS_LEN); | |
2545 | default: | |
2546 | return -EOPNOTSUPP; | |
2547 | } | |
2548 | } | |
2549 | ||
2550 | static void virtnet_get_ethtool_stats(struct net_device *dev, | |
2551 | struct ethtool_stats *stats, u64 *data) | |
2552 | { | |
2553 | struct virtnet_info *vi = netdev_priv(dev); | |
2554 | unsigned int idx = 0, start, i, j; | |
2555 | const u8 *stats_base; | |
2556 | size_t offset; | |
2557 | ||
2558 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
2559 | struct receive_queue *rq = &vi->rq[i]; | |
2560 | ||
d46eeeaf | 2561 | stats_base = (u8 *)&rq->stats; |
d7dfc5cf TM |
2562 | do { |
2563 | start = u64_stats_fetch_begin_irq(&rq->stats.syncp); | |
2564 | for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { | |
2565 | offset = virtnet_rq_stats_desc[j].offset; | |
2566 | data[idx + j] = *(u64 *)(stats_base + offset); | |
2567 | } | |
2568 | } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); | |
2569 | idx += VIRTNET_RQ_STATS_LEN; | |
2570 | } | |
2571 | ||
2572 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
2573 | struct send_queue *sq = &vi->sq[i]; | |
2574 | ||
2575 | stats_base = (u8 *)&sq->stats; | |
2576 | do { | |
2577 | start = u64_stats_fetch_begin_irq(&sq->stats.syncp); | |
2578 | for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { | |
2579 | offset = virtnet_sq_stats_desc[j].offset; | |
2580 | data[idx + j] = *(u64 *)(stats_base + offset); | |
2581 | } | |
2582 | } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); | |
2583 | idx += VIRTNET_SQ_STATS_LEN; | |
2584 | } | |
2585 | } | |
2586 | ||
d73bcd2c JW |
2587 | static void virtnet_get_channels(struct net_device *dev, |
2588 | struct ethtool_channels *channels) | |
2589 | { | |
2590 | struct virtnet_info *vi = netdev_priv(dev); | |
2591 | ||
2592 | channels->combined_count = vi->curr_queue_pairs; | |
2593 | channels->max_combined = vi->max_queue_pairs; | |
2594 | channels->max_other = 0; | |
2595 | channels->rx_count = 0; | |
2596 | channels->tx_count = 0; | |
2597 | channels->other_count = 0; | |
2598 | } | |
2599 | ||
ebb6b4b1 PR |
2600 | static int virtnet_set_link_ksettings(struct net_device *dev, |
2601 | const struct ethtool_link_ksettings *cmd) | |
16032be5 NA |
2602 | { |
2603 | struct virtnet_info *vi = netdev_priv(dev); | |
16032be5 | 2604 | |
9aedc6e2 CF |
2605 | return ethtool_virtdev_set_link_ksettings(dev, cmd, |
2606 | &vi->speed, &vi->duplex); | |
16032be5 NA |
2607 | } |
2608 | ||
ebb6b4b1 PR |
2609 | static int virtnet_get_link_ksettings(struct net_device *dev, |
2610 | struct ethtool_link_ksettings *cmd) | |
16032be5 NA |
2611 | { |
2612 | struct virtnet_info *vi = netdev_priv(dev); | |
2613 | ||
ebb6b4b1 PR |
2614 | cmd->base.speed = vi->speed; |
2615 | cmd->base.duplex = vi->duplex; | |
2616 | cmd->base.port = PORT_OTHER; | |
16032be5 NA |
2617 | |
2618 | return 0; | |
2619 | } | |
2620 | ||
0c465be1 | 2621 | static int virtnet_set_coalesce(struct net_device *dev, |
f3ccfda1 YM |
2622 | struct ethtool_coalesce *ec, |
2623 | struct kernel_ethtool_coalesce *kernel_coal, | |
2624 | struct netlink_ext_ack *extack) | |
0c465be1 | 2625 | { |
0c465be1 JW |
2626 | struct virtnet_info *vi = netdev_priv(dev); |
2627 | int i, napi_weight; | |
2628 | ||
a51e5206 JK |
2629 | if (ec->tx_max_coalesced_frames > 1 || |
2630 | ec->rx_max_coalesced_frames != 1) | |
0c465be1 JW |
2631 | return -EINVAL; |
2632 | ||
0c465be1 | 2633 | napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0; |
0c465be1 JW |
2634 | if (napi_weight ^ vi->sq[0].napi.weight) { |
2635 | if (dev->flags & IFF_UP) | |
2636 | return -EBUSY; | |
2637 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2638 | vi->sq[i].napi.weight = napi_weight; | |
2639 | } | |
2640 | ||
2641 | return 0; | |
2642 | } | |
2643 | ||
2644 | static int virtnet_get_coalesce(struct net_device *dev, | |
f3ccfda1 YM |
2645 | struct ethtool_coalesce *ec, |
2646 | struct kernel_ethtool_coalesce *kernel_coal, | |
2647 | struct netlink_ext_ack *extack) | |
0c465be1 JW |
2648 | { |
2649 | struct ethtool_coalesce ec_default = { | |
2650 | .cmd = ETHTOOL_GCOALESCE, | |
2651 | .rx_max_coalesced_frames = 1, | |
2652 | }; | |
2653 | struct virtnet_info *vi = netdev_priv(dev); | |
2654 | ||
2655 | memcpy(ec, &ec_default, sizeof(ec_default)); | |
2656 | ||
2657 | if (vi->sq[0].napi.weight) | |
2658 | ec->tx_max_coalesced_frames = 1; | |
2659 | ||
2660 | return 0; | |
2661 | } | |
2662 | ||
16032be5 NA |
2663 | static void virtnet_init_settings(struct net_device *dev) |
2664 | { | |
2665 | struct virtnet_info *vi = netdev_priv(dev); | |
2666 | ||
2667 | vi->speed = SPEED_UNKNOWN; | |
2668 | vi->duplex = DUPLEX_UNKNOWN; | |
2669 | } | |
2670 | ||
faa9b39f JB |
2671 | static void virtnet_update_settings(struct virtnet_info *vi) |
2672 | { | |
2673 | u32 speed; | |
2674 | u8 duplex; | |
2675 | ||
2676 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) | |
2677 | return; | |
2678 | ||
64ffa39d MT |
2679 | virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed); |
2680 | ||
faa9b39f JB |
2681 | if (ethtool_validate_speed(speed)) |
2682 | vi->speed = speed; | |
64ffa39d MT |
2683 | |
2684 | virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex); | |
2685 | ||
faa9b39f JB |
2686 | if (ethtool_validate_duplex(duplex)) |
2687 | vi->duplex = duplex; | |
2688 | } | |
2689 | ||
c7114b12 AM |
2690 | static u32 virtnet_get_rxfh_key_size(struct net_device *dev) |
2691 | { | |
2692 | return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size; | |
2693 | } | |
2694 | ||
2695 | static u32 virtnet_get_rxfh_indir_size(struct net_device *dev) | |
2696 | { | |
2697 | return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size; | |
2698 | } | |
2699 | ||
2700 | static int virtnet_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8 *hfunc) | |
2701 | { | |
2702 | struct virtnet_info *vi = netdev_priv(dev); | |
2703 | int i; | |
2704 | ||
2705 | if (indir) { | |
2706 | for (i = 0; i < vi->rss_indir_table_size; ++i) | |
2707 | indir[i] = vi->ctrl->rss.indirection_table[i]; | |
2708 | } | |
2709 | ||
2710 | if (key) | |
2711 | memcpy(key, vi->ctrl->rss.key, vi->rss_key_size); | |
2712 | ||
2713 | if (hfunc) | |
2714 | *hfunc = ETH_RSS_HASH_TOP; | |
2715 | ||
2716 | return 0; | |
2717 | } | |
2718 | ||
2719 | static int virtnet_set_rxfh(struct net_device *dev, const u32 *indir, const u8 *key, const u8 hfunc) | |
2720 | { | |
2721 | struct virtnet_info *vi = netdev_priv(dev); | |
2722 | int i; | |
2723 | ||
2724 | if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP) | |
2725 | return -EOPNOTSUPP; | |
2726 | ||
2727 | if (indir) { | |
2728 | for (i = 0; i < vi->rss_indir_table_size; ++i) | |
2729 | vi->ctrl->rss.indirection_table[i] = indir[i]; | |
2730 | } | |
2731 | if (key) | |
2732 | memcpy(vi->ctrl->rss.key, key, vi->rss_key_size); | |
2733 | ||
2734 | virtnet_commit_rss_command(vi); | |
2735 | ||
2736 | return 0; | |
2737 | } | |
2738 | ||
2739 | static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs) | |
2740 | { | |
2741 | struct virtnet_info *vi = netdev_priv(dev); | |
2742 | int rc = 0; | |
2743 | ||
2744 | switch (info->cmd) { | |
2745 | case ETHTOOL_GRXRINGS: | |
2746 | info->data = vi->curr_queue_pairs; | |
c1170820 AM |
2747 | break; |
2748 | case ETHTOOL_GRXFH: | |
2749 | virtnet_get_hashflow(vi, info); | |
2750 | break; | |
2751 | default: | |
2752 | rc = -EOPNOTSUPP; | |
2753 | } | |
2754 | ||
2755 | return rc; | |
2756 | } | |
2757 | ||
2758 | static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info) | |
2759 | { | |
2760 | struct virtnet_info *vi = netdev_priv(dev); | |
2761 | int rc = 0; | |
2762 | ||
2763 | switch (info->cmd) { | |
2764 | case ETHTOOL_SRXFH: | |
2765 | if (!virtnet_set_hashflow(vi, info)) | |
2766 | rc = -EINVAL; | |
2767 | ||
c7114b12 AM |
2768 | break; |
2769 | default: | |
2770 | rc = -EOPNOTSUPP; | |
2771 | } | |
2772 | ||
2773 | return rc; | |
2774 | } | |
2775 | ||
0fc0b732 | 2776 | static const struct ethtool_ops virtnet_ethtool_ops = { |
a51e5206 | 2777 | .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES, |
66846048 | 2778 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 2779 | .get_link = ethtool_op_get_link, |
8f9f4668 | 2780 | .get_ringparam = virtnet_get_ringparam, |
d7dfc5cf TM |
2781 | .get_strings = virtnet_get_strings, |
2782 | .get_sset_count = virtnet_get_sset_count, | |
2783 | .get_ethtool_stats = virtnet_get_ethtool_stats, | |
d73bcd2c JW |
2784 | .set_channels = virtnet_set_channels, |
2785 | .get_channels = virtnet_get_channels, | |
074c3582 | 2786 | .get_ts_info = ethtool_op_get_ts_info, |
ebb6b4b1 PR |
2787 | .get_link_ksettings = virtnet_get_link_ksettings, |
2788 | .set_link_ksettings = virtnet_set_link_ksettings, | |
0c465be1 JW |
2789 | .set_coalesce = virtnet_set_coalesce, |
2790 | .get_coalesce = virtnet_get_coalesce, | |
c7114b12 AM |
2791 | .get_rxfh_key_size = virtnet_get_rxfh_key_size, |
2792 | .get_rxfh_indir_size = virtnet_get_rxfh_indir_size, | |
2793 | .get_rxfh = virtnet_get_rxfh, | |
2794 | .set_rxfh = virtnet_set_rxfh, | |
2795 | .get_rxnfc = virtnet_get_rxnfc, | |
c1170820 | 2796 | .set_rxnfc = virtnet_set_rxnfc, |
a9ea3fc6 HX |
2797 | }; |
2798 | ||
9fe7bfce JF |
2799 | static void virtnet_freeze_down(struct virtio_device *vdev) |
2800 | { | |
2801 | struct virtnet_info *vi = vdev->priv; | |
9fe7bfce JF |
2802 | |
2803 | /* Make sure no work handler is accessing the device */ | |
2804 | flush_work(&vi->config_work); | |
2805 | ||
05c998b7 | 2806 | netif_tx_lock_bh(vi->dev); |
9fe7bfce | 2807 | netif_device_detach(vi->dev); |
05c998b7 | 2808 | netif_tx_unlock_bh(vi->dev); |
8af52fe9 SG |
2809 | if (netif_running(vi->dev)) |
2810 | virtnet_close(vi->dev); | |
9fe7bfce JF |
2811 | } |
2812 | ||
2813 | static int init_vqs(struct virtnet_info *vi); | |
2814 | ||
2815 | static int virtnet_restore_up(struct virtio_device *vdev) | |
2816 | { | |
2817 | struct virtnet_info *vi = vdev->priv; | |
8af52fe9 | 2818 | int err; |
9fe7bfce JF |
2819 | |
2820 | err = init_vqs(vi); | |
2821 | if (err) | |
2822 | return err; | |
2823 | ||
2824 | virtio_device_ready(vdev); | |
2825 | ||
5a159128 JW |
2826 | enable_delayed_refill(vi); |
2827 | ||
9fe7bfce | 2828 | if (netif_running(vi->dev)) { |
8af52fe9 SG |
2829 | err = virtnet_open(vi->dev); |
2830 | if (err) | |
2831 | return err; | |
9fe7bfce JF |
2832 | } |
2833 | ||
05c998b7 | 2834 | netif_tx_lock_bh(vi->dev); |
9fe7bfce | 2835 | netif_device_attach(vi->dev); |
05c998b7 | 2836 | netif_tx_unlock_bh(vi->dev); |
9fe7bfce JF |
2837 | return err; |
2838 | } | |
2839 | ||
3f93522f JW |
2840 | static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) |
2841 | { | |
2842 | struct scatterlist sg; | |
12e57169 | 2843 | vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); |
3f93522f | 2844 | |
12e57169 | 2845 | sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); |
3f93522f JW |
2846 | |
2847 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, | |
2848 | VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { | |
7934b481 | 2849 | dev_warn(&vi->dev->dev, "Fail to set guest offload.\n"); |
3f93522f JW |
2850 | return -EINVAL; |
2851 | } | |
2852 | ||
2853 | return 0; | |
2854 | } | |
2855 | ||
2856 | static int virtnet_clear_guest_offloads(struct virtnet_info *vi) | |
2857 | { | |
2858 | u64 offloads = 0; | |
2859 | ||
2860 | if (!vi->guest_offloads) | |
2861 | return 0; | |
2862 | ||
3f93522f JW |
2863 | return virtnet_set_guest_offloads(vi, offloads); |
2864 | } | |
2865 | ||
2866 | static int virtnet_restore_guest_offloads(struct virtnet_info *vi) | |
2867 | { | |
2868 | u64 offloads = vi->guest_offloads; | |
2869 | ||
2870 | if (!vi->guest_offloads) | |
2871 | return 0; | |
3f93522f JW |
2872 | |
2873 | return virtnet_set_guest_offloads(vi, offloads); | |
2874 | } | |
2875 | ||
9861ce03 JK |
2876 | static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
2877 | struct netlink_ext_ack *extack) | |
f600b690 JF |
2878 | { |
2879 | unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); | |
2880 | struct virtnet_info *vi = netdev_priv(dev); | |
2881 | struct bpf_prog *old_prog; | |
017b29c3 | 2882 | u16 xdp_qp = 0, curr_qp; |
672aafd5 | 2883 | int i, err; |
f600b690 | 2884 | |
3f93522f JW |
2885 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) |
2886 | && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || | |
2887 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
2888 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || | |
18ba58e1 JW |
2889 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || |
2890 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) { | |
dbcf24d1 | 2891 | NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first"); |
f600b690 JF |
2892 | return -EOPNOTSUPP; |
2893 | } | |
2894 | ||
2895 | if (vi->mergeable_rx_bufs && !vi->any_header_sg) { | |
4d463c4d | 2896 | NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); |
f600b690 JF |
2897 | return -EINVAL; |
2898 | } | |
2899 | ||
2900 | if (dev->mtu > max_sz) { | |
4d463c4d | 2901 | NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP"); |
f600b690 JF |
2902 | netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); |
2903 | return -EINVAL; | |
2904 | } | |
2905 | ||
672aafd5 JF |
2906 | curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; |
2907 | if (prog) | |
2908 | xdp_qp = nr_cpu_ids; | |
2909 | ||
2910 | /* XDP requires extra queues for XDP_TX */ | |
2911 | if (curr_qp + xdp_qp > vi->max_queue_pairs) { | |
9ce4e3d6 XZ |
2912 | netdev_warn_once(dev, "XDP request %i queues but max is %i. XDP_TX and XDP_REDIRECT will operate in a slower locked tx mode.\n", |
2913 | curr_qp + xdp_qp, vi->max_queue_pairs); | |
97c2c69e | 2914 | xdp_qp = 0; |
672aafd5 JF |
2915 | } |
2916 | ||
03aa6d34 TM |
2917 | old_prog = rtnl_dereference(vi->rq[0].xdp_prog); |
2918 | if (!prog && !old_prog) | |
2919 | return 0; | |
2920 | ||
85192dbf AN |
2921 | if (prog) |
2922 | bpf_prog_add(prog, vi->max_queue_pairs - 1); | |
2de2f7f4 | 2923 | |
4941d472 | 2924 | /* Make sure NAPI is not using any XDP TX queues for RX. */ |
534da5e8 TM |
2925 | if (netif_running(dev)) { |
2926 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
4e09ff53 | 2927 | napi_disable(&vi->rq[i].napi); |
534da5e8 TM |
2928 | virtnet_napi_tx_disable(&vi->sq[i].napi); |
2929 | } | |
2930 | } | |
f600b690 | 2931 | |
03aa6d34 TM |
2932 | if (!prog) { |
2933 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2934 | rcu_assign_pointer(vi->rq[i].xdp_prog, prog); | |
2935 | if (i == 0) | |
2936 | virtnet_restore_guest_offloads(vi); | |
2937 | } | |
2938 | synchronize_net(); | |
2939 | } | |
f600b690 | 2940 | |
4941d472 JW |
2941 | err = _virtnet_set_queues(vi, curr_qp + xdp_qp); |
2942 | if (err) | |
2943 | goto err; | |
188313c1 | 2944 | netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); |
4941d472 | 2945 | vi->xdp_queue_pairs = xdp_qp; |
672aafd5 | 2946 | |
03aa6d34 | 2947 | if (prog) { |
97c2c69e | 2948 | vi->xdp_enabled = true; |
03aa6d34 TM |
2949 | for (i = 0; i < vi->max_queue_pairs; i++) { |
2950 | rcu_assign_pointer(vi->rq[i].xdp_prog, prog); | |
2951 | if (i == 0 && !old_prog) | |
3f93522f | 2952 | virtnet_clear_guest_offloads(vi); |
3f93522f | 2953 | } |
97c2c69e XZ |
2954 | } else { |
2955 | vi->xdp_enabled = false; | |
03aa6d34 TM |
2956 | } |
2957 | ||
2958 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
f600b690 JF |
2959 | if (old_prog) |
2960 | bpf_prog_put(old_prog); | |
534da5e8 | 2961 | if (netif_running(dev)) { |
4e09ff53 | 2962 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
534da5e8 TM |
2963 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, |
2964 | &vi->sq[i].napi); | |
2965 | } | |
f600b690 JF |
2966 | } |
2967 | ||
2968 | return 0; | |
2de2f7f4 | 2969 | |
4941d472 | 2970 | err: |
03aa6d34 TM |
2971 | if (!prog) { |
2972 | virtnet_clear_guest_offloads(vi); | |
2973 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2974 | rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog); | |
2975 | } | |
2976 | ||
8be4d9a4 | 2977 | if (netif_running(dev)) { |
534da5e8 | 2978 | for (i = 0; i < vi->max_queue_pairs; i++) { |
8be4d9a4 | 2979 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
534da5e8 TM |
2980 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, |
2981 | &vi->sq[i].napi); | |
2982 | } | |
8be4d9a4 | 2983 | } |
2de2f7f4 JF |
2984 | if (prog) |
2985 | bpf_prog_sub(prog, vi->max_queue_pairs - 1); | |
2986 | return err; | |
f600b690 JF |
2987 | } |
2988 | ||
f4e63525 | 2989 | static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
f600b690 JF |
2990 | { |
2991 | switch (xdp->command) { | |
2992 | case XDP_SETUP_PROG: | |
9861ce03 | 2993 | return virtnet_xdp_set(dev, xdp->prog, xdp->extack); |
f600b690 JF |
2994 | default: |
2995 | return -EINVAL; | |
2996 | } | |
2997 | } | |
2998 | ||
ba5e4426 SS |
2999 | static int virtnet_get_phys_port_name(struct net_device *dev, char *buf, |
3000 | size_t len) | |
3001 | { | |
3002 | struct virtnet_info *vi = netdev_priv(dev); | |
3003 | int ret; | |
3004 | ||
3005 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) | |
3006 | return -EOPNOTSUPP; | |
3007 | ||
3008 | ret = snprintf(buf, len, "sby"); | |
3009 | if (ret >= len) | |
3010 | return -EOPNOTSUPP; | |
3011 | ||
3012 | return 0; | |
3013 | } | |
3014 | ||
a02e8964 WB |
3015 | static int virtnet_set_features(struct net_device *dev, |
3016 | netdev_features_t features) | |
3017 | { | |
3018 | struct virtnet_info *vi = netdev_priv(dev); | |
cf8691cb | 3019 | u64 offloads; |
a02e8964 WB |
3020 | int err; |
3021 | ||
dbcf24d1 | 3022 | if ((dev->features ^ features) & NETIF_F_GRO_HW) { |
97c2c69e | 3023 | if (vi->xdp_enabled) |
cf8691cb MT |
3024 | return -EBUSY; |
3025 | ||
dbcf24d1 | 3026 | if (features & NETIF_F_GRO_HW) |
cf8691cb | 3027 | offloads = vi->guest_offloads_capable; |
a02e8964 | 3028 | else |
cf8691cb | 3029 | offloads = vi->guest_offloads_capable & |
dbcf24d1 | 3030 | ~GUEST_OFFLOAD_GRO_HW_MASK; |
a02e8964 | 3031 | |
cf8691cb MT |
3032 | err = virtnet_set_guest_offloads(vi, offloads); |
3033 | if (err) | |
3034 | return err; | |
3035 | vi->guest_offloads = offloads; | |
a02e8964 WB |
3036 | } |
3037 | ||
c7114b12 AM |
3038 | if ((dev->features ^ features) & NETIF_F_RXHASH) { |
3039 | if (features & NETIF_F_RXHASH) | |
c1170820 | 3040 | vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; |
c7114b12 AM |
3041 | else |
3042 | vi->ctrl->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE; | |
3043 | ||
3044 | if (!virtnet_commit_rss_command(vi)) | |
3045 | return -EINVAL; | |
3046 | } | |
3047 | ||
a02e8964 WB |
3048 | return 0; |
3049 | } | |
3050 | ||
a520794b TL |
3051 | static void virtnet_tx_timeout(struct net_device *dev, unsigned int txqueue) |
3052 | { | |
3053 | struct virtnet_info *priv = netdev_priv(dev); | |
3054 | struct send_queue *sq = &priv->sq[txqueue]; | |
3055 | struct netdev_queue *txq = netdev_get_tx_queue(dev, txqueue); | |
3056 | ||
3057 | u64_stats_update_begin(&sq->stats.syncp); | |
3058 | sq->stats.tx_timeouts++; | |
3059 | u64_stats_update_end(&sq->stats.syncp); | |
3060 | ||
3061 | netdev_err(dev, "TX timeout on queue: %u, sq: %s, vq: 0x%x, name: %s, %u usecs ago\n", | |
3062 | txqueue, sq->name, sq->vq->index, sq->vq->name, | |
5337824f | 3063 | jiffies_to_usecs(jiffies - READ_ONCE(txq->trans_start))); |
a520794b TL |
3064 | } |
3065 | ||
76288b4e SH |
3066 | static const struct net_device_ops virtnet_netdev = { |
3067 | .ndo_open = virtnet_open, | |
3068 | .ndo_stop = virtnet_close, | |
3069 | .ndo_start_xmit = start_xmit, | |
3070 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 3071 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 3072 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
3fa2a1df | 3073 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
3074 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
3075 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
f4e63525 | 3076 | .ndo_bpf = virtnet_xdp, |
186b3c99 | 3077 | .ndo_xdp_xmit = virtnet_xdp_xmit, |
2836b4f2 | 3078 | .ndo_features_check = passthru_features_check, |
ba5e4426 | 3079 | .ndo_get_phys_port_name = virtnet_get_phys_port_name, |
a02e8964 | 3080 | .ndo_set_features = virtnet_set_features, |
a520794b | 3081 | .ndo_tx_timeout = virtnet_tx_timeout, |
76288b4e SH |
3082 | }; |
3083 | ||
586d17c5 | 3084 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 3085 | { |
586d17c5 JW |
3086 | struct virtnet_info *vi = |
3087 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
3088 | u16 v; |
3089 | ||
855e0c52 RR |
3090 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
3091 | struct virtio_net_config, status, &v) < 0) | |
507613bf | 3092 | return; |
586d17c5 JW |
3093 | |
3094 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 3095 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
3096 | virtnet_ack_link_announce(vi); |
3097 | } | |
9f4d26d0 MM |
3098 | |
3099 | /* Ignore unknown (future) status bits */ | |
3100 | v &= VIRTIO_NET_S_LINK_UP; | |
3101 | ||
3102 | if (vi->status == v) | |
507613bf | 3103 | return; |
9f4d26d0 MM |
3104 | |
3105 | vi->status = v; | |
3106 | ||
3107 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
faa9b39f | 3108 | virtnet_update_settings(vi); |
9f4d26d0 | 3109 | netif_carrier_on(vi->dev); |
986a4f4d | 3110 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
3111 | } else { |
3112 | netif_carrier_off(vi->dev); | |
986a4f4d | 3113 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 MM |
3114 | } |
3115 | } | |
3116 | ||
3117 | static void virtnet_config_changed(struct virtio_device *vdev) | |
3118 | { | |
3119 | struct virtnet_info *vi = vdev->priv; | |
3120 | ||
3b07e9ca | 3121 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
3122 | } |
3123 | ||
986a4f4d JW |
3124 | static void virtnet_free_queues(struct virtnet_info *vi) |
3125 | { | |
d4fb84ee AV |
3126 | int i; |
3127 | ||
ab3971b1 | 3128 | for (i = 0; i < vi->max_queue_pairs; i++) { |
5198d545 JK |
3129 | __netif_napi_del(&vi->rq[i].napi); |
3130 | __netif_napi_del(&vi->sq[i].napi); | |
ab3971b1 | 3131 | } |
d4fb84ee | 3132 | |
5198d545 | 3133 | /* We called __netif_napi_del(), |
963abe5c ED |
3134 | * we need to respect an RCU grace period before freeing vi->rq |
3135 | */ | |
3136 | synchronize_net(); | |
3137 | ||
986a4f4d JW |
3138 | kfree(vi->rq); |
3139 | kfree(vi->sq); | |
12e57169 | 3140 | kfree(vi->ctrl); |
986a4f4d JW |
3141 | } |
3142 | ||
47315329 | 3143 | static void _free_receive_bufs(struct virtnet_info *vi) |
986a4f4d | 3144 | { |
f600b690 | 3145 | struct bpf_prog *old_prog; |
986a4f4d JW |
3146 | int i; |
3147 | ||
3148 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
3149 | while (vi->rq[i].pages) | |
3150 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
f600b690 JF |
3151 | |
3152 | old_prog = rtnl_dereference(vi->rq[i].xdp_prog); | |
3153 | RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); | |
3154 | if (old_prog) | |
3155 | bpf_prog_put(old_prog); | |
986a4f4d | 3156 | } |
47315329 JF |
3157 | } |
3158 | ||
3159 | static void free_receive_bufs(struct virtnet_info *vi) | |
3160 | { | |
3161 | rtnl_lock(); | |
3162 | _free_receive_bufs(vi); | |
f600b690 | 3163 | rtnl_unlock(); |
986a4f4d JW |
3164 | } |
3165 | ||
fb51879d MD |
3166 | static void free_receive_page_frags(struct virtnet_info *vi) |
3167 | { | |
3168 | int i; | |
3169 | for (i = 0; i < vi->max_queue_pairs; i++) | |
3170 | if (vi->rq[i].alloc_frag.page) | |
3171 | put_page(vi->rq[i].alloc_frag.page); | |
3172 | } | |
3173 | ||
986a4f4d JW |
3174 | static void free_unused_bufs(struct virtnet_info *vi) |
3175 | { | |
3176 | void *buf; | |
3177 | int i; | |
3178 | ||
3179 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
3180 | struct virtqueue *vq = vi->sq[i].vq; | |
56434a01 | 3181 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { |
5050471d | 3182 | if (!is_xdp_frame(buf)) |
56434a01 JF |
3183 | dev_kfree_skb(buf); |
3184 | else | |
5050471d | 3185 | xdp_return_frame(ptr_to_xdp(buf)); |
56434a01 | 3186 | } |
986a4f4d JW |
3187 | } |
3188 | ||
3189 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
3190 | struct virtqueue *vq = vi->rq[i].vq; | |
3191 | ||
3192 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
ab7db917 | 3193 | if (vi->mergeable_rx_bufs) { |
680557cf | 3194 | put_page(virt_to_head_page(buf)); |
ab7db917 | 3195 | } else if (vi->big_packets) { |
fa9fac17 | 3196 | give_pages(&vi->rq[i], buf); |
ab7db917 | 3197 | } else { |
f6b10209 | 3198 | put_page(virt_to_head_page(buf)); |
ab7db917 | 3199 | } |
986a4f4d | 3200 | } |
986a4f4d JW |
3201 | } |
3202 | } | |
3203 | ||
e9d7417b JW |
3204 | static void virtnet_del_vqs(struct virtnet_info *vi) |
3205 | { | |
3206 | struct virtio_device *vdev = vi->vdev; | |
3207 | ||
310974fa | 3208 | virtnet_clean_affinity(vi); |
986a4f4d | 3209 | |
e9d7417b | 3210 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
3211 | |
3212 | virtnet_free_queues(vi); | |
e9d7417b JW |
3213 | } |
3214 | ||
d85b758f MT |
3215 | /* How large should a single buffer be so a queue full of these can fit at |
3216 | * least one full packet? | |
3217 | * Logic below assumes the mergeable buffer header is used. | |
3218 | */ | |
3219 | static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) | |
3220 | { | |
c1ddc42d | 3221 | const unsigned int hdr_len = vi->hdr_len; |
d85b758f MT |
3222 | unsigned int rq_size = virtqueue_get_vring_size(vq); |
3223 | unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; | |
3224 | unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; | |
3225 | unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); | |
3226 | ||
f0c3192c MT |
3227 | return max(max(min_buf_len, hdr_len) - hdr_len, |
3228 | (unsigned int)GOOD_PACKET_LEN); | |
d85b758f MT |
3229 | } |
3230 | ||
986a4f4d | 3231 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 3232 | { |
986a4f4d JW |
3233 | vq_callback_t **callbacks; |
3234 | struct virtqueue **vqs; | |
3235 | int ret = -ENOMEM; | |
3236 | int i, total_vqs; | |
3237 | const char **names; | |
d45b897b | 3238 | bool *ctx; |
986a4f4d JW |
3239 | |
3240 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
3241 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
3242 | * possible control vq. | |
3243 | */ | |
3244 | total_vqs = vi->max_queue_pairs * 2 + | |
3245 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
3246 | ||
3247 | /* Allocate space for find_vqs parameters */ | |
6396bb22 | 3248 | vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); |
986a4f4d JW |
3249 | if (!vqs) |
3250 | goto err_vq; | |
6da2ec56 | 3251 | callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL); |
986a4f4d JW |
3252 | if (!callbacks) |
3253 | goto err_callback; | |
6da2ec56 | 3254 | names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL); |
986a4f4d JW |
3255 | if (!names) |
3256 | goto err_names; | |
192f68cf | 3257 | if (!vi->big_packets || vi->mergeable_rx_bufs) { |
6396bb22 | 3258 | ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); |
d45b897b MT |
3259 | if (!ctx) |
3260 | goto err_ctx; | |
3261 | } else { | |
3262 | ctx = NULL; | |
3263 | } | |
986a4f4d JW |
3264 | |
3265 | /* Parameters for control virtqueue, if any */ | |
3266 | if (vi->has_cvq) { | |
3267 | callbacks[total_vqs - 1] = NULL; | |
3268 | names[total_vqs - 1] = "control"; | |
3269 | } | |
3f9c10b0 | 3270 | |
986a4f4d JW |
3271 | /* Allocate/initialize parameters for send/receive virtqueues */ |
3272 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
3273 | callbacks[rxq2vq(i)] = skb_recv_done; | |
3274 | callbacks[txq2vq(i)] = skb_xmit_done; | |
3275 | sprintf(vi->rq[i].name, "input.%d", i); | |
3276 | sprintf(vi->sq[i].name, "output.%d", i); | |
3277 | names[rxq2vq(i)] = vi->rq[i].name; | |
3278 | names[txq2vq(i)] = vi->sq[i].name; | |
d45b897b MT |
3279 | if (ctx) |
3280 | ctx[rxq2vq(i)] = true; | |
986a4f4d | 3281 | } |
3f9c10b0 | 3282 | |
a2f7dc00 XT |
3283 | ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks, |
3284 | names, ctx, NULL); | |
986a4f4d JW |
3285 | if (ret) |
3286 | goto err_find; | |
3f9c10b0 | 3287 | |
986a4f4d JW |
3288 | if (vi->has_cvq) { |
3289 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 3290 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 3291 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 3292 | } |
986a4f4d JW |
3293 | |
3294 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
3295 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
d85b758f | 3296 | vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); |
986a4f4d JW |
3297 | vi->sq[i].vq = vqs[txq2vq(i)]; |
3298 | } | |
3299 | ||
2fa3c8a8 | 3300 | /* run here: ret == 0. */ |
986a4f4d | 3301 | |
986a4f4d JW |
3302 | |
3303 | err_find: | |
d45b897b MT |
3304 | kfree(ctx); |
3305 | err_ctx: | |
986a4f4d JW |
3306 | kfree(names); |
3307 | err_names: | |
3308 | kfree(callbacks); | |
3309 | err_callback: | |
3310 | kfree(vqs); | |
3311 | err_vq: | |
3312 | return ret; | |
3313 | } | |
3314 | ||
3315 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
3316 | { | |
3317 | int i; | |
3318 | ||
122b84a1 MG |
3319 | if (vi->has_cvq) { |
3320 | vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); | |
3321 | if (!vi->ctrl) | |
3322 | goto err_ctrl; | |
3323 | } else { | |
3324 | vi->ctrl = NULL; | |
3325 | } | |
6396bb22 | 3326 | vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL); |
986a4f4d JW |
3327 | if (!vi->sq) |
3328 | goto err_sq; | |
6396bb22 | 3329 | vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL); |
008d4278 | 3330 | if (!vi->rq) |
986a4f4d JW |
3331 | goto err_rq; |
3332 | ||
3333 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
3334 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
3335 | vi->rq[i].pages = NULL; | |
d484735d JK |
3336 | netif_napi_add_weight(vi->dev, &vi->rq[i].napi, virtnet_poll, |
3337 | napi_weight); | |
8d602e1a JK |
3338 | netif_napi_add_tx_weight(vi->dev, &vi->sq[i].napi, |
3339 | virtnet_poll_tx, | |
3340 | napi_tx ? napi_weight : 0); | |
986a4f4d JW |
3341 | |
3342 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
5377d758 | 3343 | ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); |
986a4f4d | 3344 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); |
d7dfc5cf TM |
3345 | |
3346 | u64_stats_init(&vi->rq[i].stats.syncp); | |
3347 | u64_stats_init(&vi->sq[i].stats.syncp); | |
986a4f4d JW |
3348 | } |
3349 | ||
3350 | return 0; | |
3351 | ||
3352 | err_rq: | |
3353 | kfree(vi->sq); | |
3354 | err_sq: | |
12e57169 MT |
3355 | kfree(vi->ctrl); |
3356 | err_ctrl: | |
986a4f4d JW |
3357 | return -ENOMEM; |
3358 | } | |
3359 | ||
3360 | static int init_vqs(struct virtnet_info *vi) | |
3361 | { | |
3362 | int ret; | |
3363 | ||
3364 | /* Allocate send & receive queues */ | |
3365 | ret = virtnet_alloc_queues(vi); | |
3366 | if (ret) | |
3367 | goto err; | |
3368 | ||
3369 | ret = virtnet_find_vqs(vi); | |
3370 | if (ret) | |
3371 | goto err_free; | |
3372 | ||
a0d1d0f4 | 3373 | cpus_read_lock(); |
8898c21c | 3374 | virtnet_set_affinity(vi); |
a0d1d0f4 | 3375 | cpus_read_unlock(); |
47be2479 | 3376 | |
986a4f4d JW |
3377 | return 0; |
3378 | ||
3379 | err_free: | |
3380 | virtnet_free_queues(vi); | |
3381 | err: | |
3382 | return ret; | |
3f9c10b0 AS |
3383 | } |
3384 | ||
fbf28d78 MD |
3385 | #ifdef CONFIG_SYSFS |
3386 | static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, | |
718ad681 | 3387 | char *buf) |
fbf28d78 MD |
3388 | { |
3389 | struct virtnet_info *vi = netdev_priv(queue->dev); | |
3390 | unsigned int queue_index = get_netdev_rx_queue_index(queue); | |
3cc81a9a JW |
3391 | unsigned int headroom = virtnet_get_headroom(vi); |
3392 | unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; | |
5377d758 | 3393 | struct ewma_pkt_len *avg; |
fbf28d78 MD |
3394 | |
3395 | BUG_ON(queue_index >= vi->max_queue_pairs); | |
3396 | avg = &vi->rq[queue_index].mrg_avg_pkt_len; | |
d85b758f | 3397 | return sprintf(buf, "%u\n", |
3cc81a9a JW |
3398 | get_mergeable_buf_len(&vi->rq[queue_index], avg, |
3399 | SKB_DATA_ALIGN(headroom + tailroom))); | |
fbf28d78 MD |
3400 | } |
3401 | ||
3402 | static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = | |
3403 | __ATTR_RO(mergeable_rx_buffer_size); | |
3404 | ||
3405 | static struct attribute *virtio_net_mrg_rx_attrs[] = { | |
3406 | &mergeable_rx_buffer_size_attribute.attr, | |
3407 | NULL | |
3408 | }; | |
3409 | ||
3410 | static const struct attribute_group virtio_net_mrg_rx_group = { | |
3411 | .name = "virtio_net", | |
3412 | .attrs = virtio_net_mrg_rx_attrs | |
3413 | }; | |
3414 | #endif | |
3415 | ||
892d6eb1 JW |
3416 | static bool virtnet_fail_on_feature(struct virtio_device *vdev, |
3417 | unsigned int fbit, | |
3418 | const char *fname, const char *dname) | |
3419 | { | |
3420 | if (!virtio_has_feature(vdev, fbit)) | |
3421 | return false; | |
3422 | ||
3423 | dev_err(&vdev->dev, "device advertises feature %s but not %s", | |
3424 | fname, dname); | |
3425 | ||
3426 | return true; | |
3427 | } | |
3428 | ||
3429 | #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ | |
3430 | virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) | |
3431 | ||
3432 | static bool virtnet_validate_features(struct virtio_device *vdev) | |
3433 | { | |
3434 | if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && | |
3435 | (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, | |
3436 | "VIRTIO_NET_F_CTRL_VQ") || | |
3437 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, | |
3438 | "VIRTIO_NET_F_CTRL_VQ") || | |
3439 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, | |
3440 | "VIRTIO_NET_F_CTRL_VQ") || | |
3441 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || | |
3442 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, | |
c7114b12 AM |
3443 | "VIRTIO_NET_F_CTRL_VQ") || |
3444 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, | |
91f41f01 AM |
3445 | "VIRTIO_NET_F_CTRL_VQ") || |
3446 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT, | |
892d6eb1 JW |
3447 | "VIRTIO_NET_F_CTRL_VQ"))) { |
3448 | return false; | |
3449 | } | |
3450 | ||
3451 | return true; | |
3452 | } | |
3453 | ||
d0c2c997 JW |
3454 | #define MIN_MTU ETH_MIN_MTU |
3455 | #define MAX_MTU ETH_MAX_MTU | |
3456 | ||
fe36cbe0 | 3457 | static int virtnet_validate(struct virtio_device *vdev) |
296f96fc | 3458 | { |
6ba42248 MT |
3459 | if (!vdev->config->get) { |
3460 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
3461 | __func__); | |
3462 | return -EINVAL; | |
3463 | } | |
3464 | ||
892d6eb1 JW |
3465 | if (!virtnet_validate_features(vdev)) |
3466 | return -EINVAL; | |
3467 | ||
fe36cbe0 MT |
3468 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
3469 | int mtu = virtio_cread16(vdev, | |
3470 | offsetof(struct virtio_net_config, | |
3471 | mtu)); | |
3472 | if (mtu < MIN_MTU) | |
3473 | __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); | |
3474 | } | |
3475 | ||
3476 | return 0; | |
3477 | } | |
3478 | ||
3479 | static int virtnet_probe(struct virtio_device *vdev) | |
3480 | { | |
d7dfc5cf | 3481 | int i, err = -ENOMEM; |
fe36cbe0 MT |
3482 | struct net_device *dev; |
3483 | struct virtnet_info *vi; | |
3484 | u16 max_queue_pairs; | |
3485 | int mtu; | |
3486 | ||
c7114b12 AM |
3487 | /* Find if host supports multiqueue/rss virtio_net device */ |
3488 | max_queue_pairs = 1; | |
3489 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) | |
3490 | max_queue_pairs = | |
3491 | virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs)); | |
986a4f4d JW |
3492 | |
3493 | /* We need at least 2 queue's */ | |
c7114b12 | 3494 | if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || |
986a4f4d JW |
3495 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || |
3496 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
3497 | max_queue_pairs = 1; | |
296f96fc RR |
3498 | |
3499 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 3500 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
3501 | if (!dev) |
3502 | return -ENOMEM; | |
3503 | ||
3504 | /* Set up network device as normal. */ | |
ab5bd583 XZ |
3505 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE | |
3506 | IFF_TX_SKB_NO_LINEAR; | |
76288b4e | 3507 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 3508 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 3509 | |
7ad24ea4 | 3510 | dev->ethtool_ops = &virtnet_ethtool_ops; |
296f96fc RR |
3511 | SET_NETDEV_DEV(dev, &vdev->dev); |
3512 | ||
3513 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 3514 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 3515 | /* This opens up the world of extra features. */ |
48900cb6 | 3516 | dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 | 3517 | if (csum) |
48900cb6 | 3518 | dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 MM |
3519 | |
3520 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
e078de03 | 3521 | dev->hw_features |= NETIF_F_TSO |
34a48579 RR |
3522 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
3523 | } | |
5539ae96 | 3524 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
3525 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
3526 | dev->hw_features |= NETIF_F_TSO; | |
3527 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
3528 | dev->hw_features |= NETIF_F_TSO6; | |
3529 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
3530 | dev->hw_features |= NETIF_F_TSO_ECN; | |
98e778c9 | 3531 | |
41f2f127 JW |
3532 | dev->features |= NETIF_F_GSO_ROBUST; |
3533 | ||
98e778c9 | 3534 | if (gso) |
e078de03 | 3535 | dev->features |= dev->hw_features & NETIF_F_ALL_TSO; |
98e778c9 | 3536 | /* (!csum && gso) case will be fixed by register_netdev() */ |
296f96fc | 3537 | } |
4f49129b TH |
3538 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
3539 | dev->features |= NETIF_F_RXCSUM; | |
a02e8964 WB |
3540 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
3541 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)) | |
dbcf24d1 | 3542 | dev->features |= NETIF_F_GRO_HW; |
cf8691cb | 3543 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) |
dbcf24d1 | 3544 | dev->hw_features |= NETIF_F_GRO_HW; |
296f96fc | 3545 | |
4fda8302 JW |
3546 | dev->vlan_features = dev->features; |
3547 | ||
d0c2c997 JW |
3548 | /* MTU range: 68 - 65535 */ |
3549 | dev->min_mtu = MIN_MTU; | |
3550 | dev->max_mtu = MAX_MTU; | |
3551 | ||
296f96fc | 3552 | /* Configuration may specify what MAC to use. Otherwise random. */ |
f2edaa4a JK |
3553 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { |
3554 | u8 addr[ETH_ALEN]; | |
3555 | ||
855e0c52 RR |
3556 | virtio_cread_bytes(vdev, |
3557 | offsetof(struct virtio_net_config, mac), | |
f2edaa4a JK |
3558 | addr, ETH_ALEN); |
3559 | eth_hw_addr_set(dev, addr); | |
3560 | } else { | |
f2cedb63 | 3561 | eth_hw_addr_random(dev); |
f2edaa4a | 3562 | } |
296f96fc RR |
3563 | |
3564 | /* Set up our device-specific information */ | |
3565 | vi = netdev_priv(dev); | |
296f96fc RR |
3566 | vi->dev = dev; |
3567 | vi->vdev = vdev; | |
d9d5dcc8 | 3568 | vdev->priv = vi; |
827da44c | 3569 | |
586d17c5 | 3570 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); |
5a159128 | 3571 | spin_lock_init(&vi->refill_lock); |
296f96fc | 3572 | |
97402b96 | 3573 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
3574 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
3575 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
e3e3c423 VY |
3576 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
3577 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) | |
97402b96 HX |
3578 | vi->big_packets = true; |
3579 | ||
3f2c31d9 MM |
3580 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
3581 | vi->mergeable_rx_bufs = true; | |
3582 | ||
91f41f01 AM |
3583 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) |
3584 | vi->has_rss_hash_report = true; | |
3585 | ||
3586 | if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) | |
c7114b12 | 3587 | vi->has_rss = true; |
91f41f01 AM |
3588 | |
3589 | if (vi->has_rss || vi->has_rss_hash_report) { | |
c7114b12 AM |
3590 | vi->rss_indir_table_size = |
3591 | virtio_cread16(vdev, offsetof(struct virtio_net_config, | |
3592 | rss_max_indirection_table_length)); | |
3593 | vi->rss_key_size = | |
3594 | virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size)); | |
3595 | ||
3596 | vi->rss_hash_types_supported = | |
3597 | virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types)); | |
3598 | vi->rss_hash_types_supported &= | |
3599 | ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX | | |
3600 | VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | | |
3601 | VIRTIO_NET_RSS_HASH_TYPE_UDP_EX); | |
3602 | ||
3603 | dev->hw_features |= NETIF_F_RXHASH; | |
3604 | } | |
91f41f01 AM |
3605 | |
3606 | if (vi->has_rss_hash_report) | |
3607 | vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash); | |
3608 | else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || | |
3609 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
012873d0 MT |
3610 | vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
3611 | else | |
3612 | vi->hdr_len = sizeof(struct virtio_net_hdr); | |
3613 | ||
75993300 MT |
3614 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || |
3615 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
e7428e95 MT |
3616 | vi->any_header_sg = true; |
3617 | ||
986a4f4d JW |
3618 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
3619 | vi->has_cvq = true; | |
3620 | ||
14de9d11 AC |
3621 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
3622 | mtu = virtio_cread16(vdev, | |
3623 | offsetof(struct virtio_net_config, | |
3624 | mtu)); | |
93a205ee | 3625 | if (mtu < dev->min_mtu) { |
fe36cbe0 MT |
3626 | /* Should never trigger: MTU was previously validated |
3627 | * in virtnet_validate. | |
3628 | */ | |
7934b481 YS |
3629 | dev_err(&vdev->dev, |
3630 | "device MTU appears to have changed it is now %d < %d", | |
3631 | mtu, dev->min_mtu); | |
411ea23a | 3632 | err = -EINVAL; |
d7dfc5cf | 3633 | goto free; |
93a205ee | 3634 | } |
2e123b44 | 3635 | |
fe36cbe0 MT |
3636 | dev->mtu = mtu; |
3637 | dev->max_mtu = mtu; | |
3638 | ||
2e123b44 MT |
3639 | /* TODO: size buffers correctly in this case. */ |
3640 | if (dev->mtu > ETH_DATA_LEN) | |
3641 | vi->big_packets = true; | |
14de9d11 AC |
3642 | } |
3643 | ||
012873d0 MT |
3644 | if (vi->any_header_sg) |
3645 | dev->needed_headroom = vi->hdr_len; | |
6ebbc1a6 | 3646 | |
44900010 JW |
3647 | /* Enable multiqueue by default */ |
3648 | if (num_online_cpus() >= max_queue_pairs) | |
3649 | vi->curr_queue_pairs = max_queue_pairs; | |
3650 | else | |
3651 | vi->curr_queue_pairs = num_online_cpus(); | |
986a4f4d JW |
3652 | vi->max_queue_pairs = max_queue_pairs; |
3653 | ||
3654 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 3655 | err = init_vqs(vi); |
d2a7ddda | 3656 | if (err) |
d7dfc5cf | 3657 | goto free; |
296f96fc | 3658 | |
fbf28d78 MD |
3659 | #ifdef CONFIG_SYSFS |
3660 | if (vi->mergeable_rx_bufs) | |
3661 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; | |
3662 | #endif | |
0f13b66b ZYW |
3663 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
3664 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); | |
986a4f4d | 3665 | |
16032be5 NA |
3666 | virtnet_init_settings(dev); |
3667 | ||
ba5e4426 SS |
3668 | if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { |
3669 | vi->failover = net_failover_create(vi->dev); | |
4b8e6ac4 WY |
3670 | if (IS_ERR(vi->failover)) { |
3671 | err = PTR_ERR(vi->failover); | |
ba5e4426 | 3672 | goto free_vqs; |
4b8e6ac4 | 3673 | } |
ba5e4426 SS |
3674 | } |
3675 | ||
91f41f01 | 3676 | if (vi->has_rss || vi->has_rss_hash_report) |
c7114b12 AM |
3677 | virtnet_init_default_rss(vi); |
3678 | ||
50c0ada6 JW |
3679 | /* serialize netdev register + virtio_device_ready() with ndo_open() */ |
3680 | rtnl_lock(); | |
3681 | ||
3682 | err = register_netdevice(dev); | |
296f96fc RR |
3683 | if (err) { |
3684 | pr_debug("virtio_net: registering device failed\n"); | |
50c0ada6 | 3685 | rtnl_unlock(); |
ba5e4426 | 3686 | goto free_failover; |
296f96fc | 3687 | } |
b3369c1f | 3688 | |
4baf1e33 MT |
3689 | virtio_device_ready(vdev); |
3690 | ||
50c0ada6 JW |
3691 | rtnl_unlock(); |
3692 | ||
8017c279 | 3693 | err = virtnet_cpu_notif_add(vi); |
8de4b2f3 WG |
3694 | if (err) { |
3695 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
f00e35e2 | 3696 | goto free_unregister_netdev; |
8de4b2f3 WG |
3697 | } |
3698 | ||
a220871b | 3699 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
44900010 | 3700 | |
167c25e4 JW |
3701 | /* Assume link up if device can't report link status, |
3702 | otherwise get link status from config. */ | |
bda7fab5 | 3703 | netif_carrier_off(dev); |
167c25e4 | 3704 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { |
3b07e9ca | 3705 | schedule_work(&vi->config_work); |
167c25e4 JW |
3706 | } else { |
3707 | vi->status = VIRTIO_NET_S_LINK_UP; | |
faa9b39f | 3708 | virtnet_update_settings(vi); |
167c25e4 JW |
3709 | netif_carrier_on(dev); |
3710 | } | |
9f4d26d0 | 3711 | |
3f93522f JW |
3712 | for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) |
3713 | if (virtio_has_feature(vi->vdev, guest_offloads[i])) | |
3714 | set_bit(guest_offloads[i], &vi->guest_offloads); | |
a02e8964 | 3715 | vi->guest_offloads_capable = vi->guest_offloads; |
3f93522f | 3716 | |
986a4f4d JW |
3717 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
3718 | dev->name, max_queue_pairs); | |
3719 | ||
296f96fc RR |
3720 | return 0; |
3721 | ||
f00e35e2 | 3722 | free_unregister_netdev: |
d9679d00 | 3723 | virtio_reset_device(vdev); |
02465555 | 3724 | |
b3369c1f | 3725 | unregister_netdev(dev); |
ba5e4426 SS |
3726 | free_failover: |
3727 | net_failover_destroy(vi->failover); | |
d2a7ddda | 3728 | free_vqs: |
986a4f4d | 3729 | cancel_delayed_work_sync(&vi->refill); |
fb51879d | 3730 | free_receive_page_frags(vi); |
e9d7417b | 3731 | virtnet_del_vqs(vi); |
296f96fc RR |
3732 | free: |
3733 | free_netdev(dev); | |
3734 | return err; | |
3735 | } | |
3736 | ||
04486ed0 | 3737 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 3738 | { |
d9679d00 | 3739 | virtio_reset_device(vi->vdev); |
830a8a97 SM |
3740 | |
3741 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 3742 | free_unused_bufs(vi); |
fb6813f4 | 3743 | |
986a4f4d | 3744 | free_receive_bufs(vi); |
d2a7ddda | 3745 | |
fb51879d MD |
3746 | free_receive_page_frags(vi); |
3747 | ||
986a4f4d | 3748 | virtnet_del_vqs(vi); |
04486ed0 AS |
3749 | } |
3750 | ||
8cc085d6 | 3751 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
3752 | { |
3753 | struct virtnet_info *vi = vdev->priv; | |
3754 | ||
8017c279 | 3755 | virtnet_cpu_notif_remove(vi); |
8de4b2f3 | 3756 | |
102a2786 MT |
3757 | /* Make sure no work handler is accessing the device. */ |
3758 | flush_work(&vi->config_work); | |
586d17c5 | 3759 | |
04486ed0 AS |
3760 | unregister_netdev(vi->dev); |
3761 | ||
ba5e4426 SS |
3762 | net_failover_destroy(vi->failover); |
3763 | ||
04486ed0 | 3764 | remove_vq_common(vi); |
fb6813f4 | 3765 | |
74b2553f | 3766 | free_netdev(vi->dev); |
296f96fc RR |
3767 | } |
3768 | ||
67a75194 | 3769 | static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) |
0741bcb5 AS |
3770 | { |
3771 | struct virtnet_info *vi = vdev->priv; | |
3772 | ||
8017c279 | 3773 | virtnet_cpu_notif_remove(vi); |
9fe7bfce | 3774 | virtnet_freeze_down(vdev); |
0741bcb5 AS |
3775 | remove_vq_common(vi); |
3776 | ||
3777 | return 0; | |
3778 | } | |
3779 | ||
67a75194 | 3780 | static __maybe_unused int virtnet_restore(struct virtio_device *vdev) |
0741bcb5 AS |
3781 | { |
3782 | struct virtnet_info *vi = vdev->priv; | |
9fe7bfce | 3783 | int err; |
0741bcb5 | 3784 | |
9fe7bfce | 3785 | err = virtnet_restore_up(vdev); |
0741bcb5 AS |
3786 | if (err) |
3787 | return err; | |
986a4f4d JW |
3788 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
3789 | ||
8017c279 | 3790 | err = virtnet_cpu_notif_add(vi); |
3f2869ca XY |
3791 | if (err) { |
3792 | virtnet_freeze_down(vdev); | |
3793 | remove_vq_common(vi); | |
ec9debbd | 3794 | return err; |
3f2869ca | 3795 | } |
ec9debbd | 3796 | |
0741bcb5 AS |
3797 | return 0; |
3798 | } | |
0741bcb5 | 3799 | |
296f96fc RR |
3800 | static struct virtio_device_id id_table[] = { |
3801 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
3802 | { 0 }, | |
3803 | }; | |
3804 | ||
f3358507 MT |
3805 | #define VIRTNET_FEATURES \ |
3806 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ | |
3807 | VIRTIO_NET_F_MAC, \ | |
3808 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ | |
3809 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ | |
3810 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ | |
3811 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ | |
3812 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ | |
3813 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ | |
3814 | VIRTIO_NET_F_CTRL_MAC_ADDR, \ | |
faa9b39f | 3815 | VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ |
c7114b12 | 3816 | VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \ |
91f41f01 | 3817 | VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT |
f3358507 | 3818 | |
c45a6816 | 3819 | static unsigned int features[] = { |
f3358507 MT |
3820 | VIRTNET_FEATURES, |
3821 | }; | |
3822 | ||
3823 | static unsigned int features_legacy[] = { | |
3824 | VIRTNET_FEATURES, | |
3825 | VIRTIO_NET_F_GSO, | |
e7428e95 | 3826 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
3827 | }; |
3828 | ||
22402529 | 3829 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
3830 | .feature_table = features, |
3831 | .feature_table_size = ARRAY_SIZE(features), | |
f3358507 MT |
3832 | .feature_table_legacy = features_legacy, |
3833 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), | |
296f96fc RR |
3834 | .driver.name = KBUILD_MODNAME, |
3835 | .driver.owner = THIS_MODULE, | |
3836 | .id_table = id_table, | |
fe36cbe0 | 3837 | .validate = virtnet_validate, |
296f96fc | 3838 | .probe = virtnet_probe, |
8cc085d6 | 3839 | .remove = virtnet_remove, |
9f4d26d0 | 3840 | .config_changed = virtnet_config_changed, |
89107000 | 3841 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
3842 | .freeze = virtnet_freeze, |
3843 | .restore = virtnet_restore, | |
3844 | #endif | |
296f96fc RR |
3845 | }; |
3846 | ||
8017c279 SAS |
3847 | static __init int virtio_net_driver_init(void) |
3848 | { | |
3849 | int ret; | |
3850 | ||
73c1b41e | 3851 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", |
8017c279 SAS |
3852 | virtnet_cpu_online, |
3853 | virtnet_cpu_down_prep); | |
3854 | if (ret < 0) | |
3855 | goto out; | |
3856 | virtionet_online = ret; | |
73c1b41e | 3857 | ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", |
8017c279 SAS |
3858 | NULL, virtnet_cpu_dead); |
3859 | if (ret) | |
3860 | goto err_dead; | |
4f50ef15 | 3861 | ret = register_virtio_driver(&virtio_net_driver); |
8017c279 SAS |
3862 | if (ret) |
3863 | goto err_virtio; | |
3864 | return 0; | |
3865 | err_virtio: | |
3866 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); | |
3867 | err_dead: | |
3868 | cpuhp_remove_multi_state(virtionet_online); | |
3869 | out: | |
3870 | return ret; | |
3871 | } | |
3872 | module_init(virtio_net_driver_init); | |
3873 | ||
3874 | static __exit void virtio_net_driver_exit(void) | |
3875 | { | |
cfa0ebc9 | 3876 | unregister_virtio_driver(&virtio_net_driver); |
8017c279 SAS |
3877 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); |
3878 | cpuhp_remove_multi_state(virtionet_online); | |
8017c279 SAS |
3879 | } |
3880 | module_exit(virtio_net_driver_exit); | |
296f96fc RR |
3881 | |
3882 | MODULE_DEVICE_TABLE(virtio, id_table); | |
3883 | MODULE_DESCRIPTION("Virtio network driver"); | |
3884 | MODULE_LICENSE("GPL"); |