Commit | Line | Data |
---|---|---|
48925e37 | 1 | /* A network driver using virtio. |
296f96fc RR |
2 | * |
3 | * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
adf8d3ff | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
296f96fc RR |
17 | */ |
18 | //#define DEBUG | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 21 | #include <linux/ethtool.h> |
296f96fc RR |
22 | #include <linux/module.h> |
23 | #include <linux/virtio.h> | |
24 | #include <linux/virtio_net.h> | |
f600b690 | 25 | #include <linux/bpf.h> |
a67edbf4 | 26 | #include <linux/bpf_trace.h> |
296f96fc | 27 | #include <linux/scatterlist.h> |
e918085a | 28 | #include <linux/if_vlan.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
8de4b2f3 | 30 | #include <linux/cpu.h> |
ab7db917 | 31 | #include <linux/average.h> |
186b3c99 | 32 | #include <linux/filter.h> |
d85b758f | 33 | #include <net/route.h> |
754b8a21 | 34 | #include <net/xdp.h> |
296f96fc | 35 | |
d34710e3 | 36 | static int napi_weight = NAPI_POLL_WEIGHT; |
6c0cd7c0 DL |
37 | module_param(napi_weight, int, 0444); |
38 | ||
b92f1e67 | 39 | static bool csum = true, gso = true, napi_tx; |
34a48579 RR |
40 | module_param(csum, bool, 0444); |
41 | module_param(gso, bool, 0444); | |
b92f1e67 | 42 | module_param(napi_tx, bool, 0644); |
34a48579 | 43 | |
296f96fc | 44 | /* FIXME: MTU in config. */ |
5061de36 | 45 | #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 46 | #define GOOD_COPY_LEN 128 |
296f96fc | 47 | |
f6b10209 JW |
48 | #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
49 | ||
2de2f7f4 JF |
50 | /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */ |
51 | #define VIRTIO_XDP_HEADROOM 256 | |
52 | ||
5377d758 JB |
53 | /* RX packet size EWMA. The average packet size is used to determine the packet |
54 | * buffer size when refilling RX rings. As the entire RX ring may be refilled | |
55 | * at once, the weight is chosen so that the EWMA will be insensitive to short- | |
56 | * term, transient changes in packet size. | |
ab7db917 | 57 | */ |
eb1e011a | 58 | DECLARE_EWMA(pkt_len, 0, 64) |
ab7db917 | 59 | |
66846048 | 60 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 61 | |
7acd4329 CIK |
62 | static const unsigned long guest_offloads[] = { |
63 | VIRTIO_NET_F_GUEST_TSO4, | |
64 | VIRTIO_NET_F_GUEST_TSO6, | |
65 | VIRTIO_NET_F_GUEST_ECN, | |
66 | VIRTIO_NET_F_GUEST_UFO | |
67 | }; | |
3f93522f | 68 | |
d7dfc5cf TM |
69 | struct virtnet_stat_desc { |
70 | char desc[ETH_GSTRING_LEN]; | |
71 | size_t offset; | |
3fa2a1df | 72 | }; |
73 | ||
d7dfc5cf TM |
74 | struct virtnet_sq_stats { |
75 | struct u64_stats_sync syncp; | |
76 | u64 packets; | |
77 | u64 bytes; | |
78 | }; | |
79 | ||
80 | struct virtnet_rq_stats { | |
81 | struct u64_stats_sync syncp; | |
82 | u64 packets; | |
83 | u64 bytes; | |
84 | }; | |
85 | ||
86 | #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m) | |
87 | #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m) | |
88 | ||
89 | static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = { | |
90 | { "packets", VIRTNET_SQ_STAT(packets) }, | |
91 | { "bytes", VIRTNET_SQ_STAT(bytes) }, | |
92 | }; | |
93 | ||
94 | static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = { | |
95 | { "packets", VIRTNET_RQ_STAT(packets) }, | |
96 | { "bytes", VIRTNET_RQ_STAT(bytes) }, | |
97 | }; | |
98 | ||
99 | #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc) | |
100 | #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc) | |
101 | ||
e9d7417b JW |
102 | /* Internal representation of a send virtqueue */ |
103 | struct send_queue { | |
104 | /* Virtqueue associated with this send _queue */ | |
105 | struct virtqueue *vq; | |
106 | ||
107 | /* TX: fragments + linear part + virtio header */ | |
108 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
109 | |
110 | /* Name of the send queue: output.$index */ | |
111 | char name[40]; | |
b92f1e67 | 112 | |
d7dfc5cf TM |
113 | struct virtnet_sq_stats stats; |
114 | ||
b92f1e67 | 115 | struct napi_struct napi; |
e9d7417b JW |
116 | }; |
117 | ||
118 | /* Internal representation of a receive virtqueue */ | |
119 | struct receive_queue { | |
120 | /* Virtqueue associated with this receive_queue */ | |
121 | struct virtqueue *vq; | |
122 | ||
296f96fc RR |
123 | struct napi_struct napi; |
124 | ||
f600b690 JF |
125 | struct bpf_prog __rcu *xdp_prog; |
126 | ||
d7dfc5cf TM |
127 | struct virtnet_rq_stats stats; |
128 | ||
e9d7417b JW |
129 | /* Chain pages by the private ptr. */ |
130 | struct page *pages; | |
131 | ||
ab7db917 | 132 | /* Average packet length for mergeable receive buffers. */ |
5377d758 | 133 | struct ewma_pkt_len mrg_avg_pkt_len; |
ab7db917 | 134 | |
fb51879d MD |
135 | /* Page frag for packet buffer allocation. */ |
136 | struct page_frag alloc_frag; | |
137 | ||
e9d7417b JW |
138 | /* RX: fragments + linear part + virtio header */ |
139 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d | 140 | |
d85b758f MT |
141 | /* Min single buffer size for mergeable buffers case. */ |
142 | unsigned int min_buf_len; | |
143 | ||
986a4f4d JW |
144 | /* Name of this receive queue: input.$index */ |
145 | char name[40]; | |
754b8a21 JDB |
146 | |
147 | struct xdp_rxq_info xdp_rxq; | |
e9d7417b JW |
148 | }; |
149 | ||
12e57169 MT |
150 | /* Control VQ buffers: protected by the rtnl lock */ |
151 | struct control_buf { | |
152 | struct virtio_net_ctrl_hdr hdr; | |
153 | virtio_net_ctrl_ack status; | |
154 | struct virtio_net_ctrl_mq mq; | |
155 | u8 promisc; | |
156 | u8 allmulti; | |
d7fad4c8 | 157 | __virtio16 vid; |
f4ee703a | 158 | __virtio64 offloads; |
12e57169 MT |
159 | }; |
160 | ||
e9d7417b JW |
161 | struct virtnet_info { |
162 | struct virtio_device *vdev; | |
163 | struct virtqueue *cvq; | |
164 | struct net_device *dev; | |
986a4f4d JW |
165 | struct send_queue *sq; |
166 | struct receive_queue *rq; | |
e9d7417b JW |
167 | unsigned int status; |
168 | ||
986a4f4d JW |
169 | /* Max # of queue pairs supported by the device */ |
170 | u16 max_queue_pairs; | |
171 | ||
172 | /* # of queue pairs currently used by the driver */ | |
173 | u16 curr_queue_pairs; | |
174 | ||
672aafd5 JF |
175 | /* # of XDP queue pairs currently used by the driver */ |
176 | u16 xdp_queue_pairs; | |
177 | ||
97402b96 HX |
178 | /* I like... big packets and I cannot lie! */ |
179 | bool big_packets; | |
180 | ||
3f2c31d9 MM |
181 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
182 | bool mergeable_rx_bufs; | |
183 | ||
986a4f4d JW |
184 | /* Has control virtqueue */ |
185 | bool has_cvq; | |
186 | ||
e7428e95 MT |
187 | /* Host can handle any s/g split between our header and packet data */ |
188 | bool any_header_sg; | |
189 | ||
012873d0 MT |
190 | /* Packet virtio header size */ |
191 | u8 hdr_len; | |
192 | ||
3161e453 RR |
193 | /* Work struct for refilling if we run low on memory. */ |
194 | struct delayed_work refill; | |
195 | ||
586d17c5 JW |
196 | /* Work struct for config space updates */ |
197 | struct work_struct config_work; | |
198 | ||
986a4f4d JW |
199 | /* Does the affinity hint is set for virtqueues? */ |
200 | bool affinity_hint_set; | |
47be2479 | 201 | |
8017c279 SAS |
202 | /* CPU hotplug instances for online & dead */ |
203 | struct hlist_node node; | |
204 | struct hlist_node node_dead; | |
2ac46030 | 205 | |
12e57169 | 206 | struct control_buf *ctrl; |
16032be5 NA |
207 | |
208 | /* Ethtool settings */ | |
209 | u8 duplex; | |
210 | u32 speed; | |
3f93522f JW |
211 | |
212 | unsigned long guest_offloads; | |
296f96fc RR |
213 | }; |
214 | ||
9ab86bbc | 215 | struct padded_vnet_hdr { |
012873d0 | 216 | struct virtio_net_hdr_mrg_rxbuf hdr; |
9ab86bbc | 217 | /* |
012873d0 MT |
218 | * hdr is in a separate sg buffer, and data sg buffer shares same page |
219 | * with this header sg. This padding makes next sg 16 byte aligned | |
220 | * after the header. | |
9ab86bbc | 221 | */ |
012873d0 | 222 | char padding[4]; |
9ab86bbc SM |
223 | }; |
224 | ||
986a4f4d JW |
225 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
226 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
227 | */ | |
228 | static int vq2txq(struct virtqueue *vq) | |
229 | { | |
9d0ca6ed | 230 | return (vq->index - 1) / 2; |
986a4f4d JW |
231 | } |
232 | ||
233 | static int txq2vq(int txq) | |
234 | { | |
235 | return txq * 2 + 1; | |
236 | } | |
237 | ||
238 | static int vq2rxq(struct virtqueue *vq) | |
239 | { | |
9d0ca6ed | 240 | return vq->index / 2; |
986a4f4d JW |
241 | } |
242 | ||
243 | static int rxq2vq(int rxq) | |
244 | { | |
245 | return rxq * 2; | |
246 | } | |
247 | ||
012873d0 | 248 | static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 249 | { |
012873d0 | 250 | return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; |
296f96fc RR |
251 | } |
252 | ||
9ab86bbc SM |
253 | /* |
254 | * private is used to chain pages for big packets, put the whole | |
255 | * most recent used list in the beginning for reuse | |
256 | */ | |
e9d7417b | 257 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 258 | { |
9ab86bbc | 259 | struct page *end; |
0a888fd1 | 260 | |
e9d7417b | 261 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 262 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
263 | end->private = (unsigned long)rq->pages; |
264 | rq->pages = page; | |
0a888fd1 MM |
265 | } |
266 | ||
e9d7417b | 267 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 268 | { |
e9d7417b | 269 | struct page *p = rq->pages; |
fb6813f4 | 270 | |
9ab86bbc | 271 | if (p) { |
e9d7417b | 272 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
273 | /* clear private here, it is used to chain pages */ |
274 | p->private = 0; | |
275 | } else | |
fb6813f4 RR |
276 | p = alloc_page(gfp_mask); |
277 | return p; | |
278 | } | |
279 | ||
e4e8452a WB |
280 | static void virtqueue_napi_schedule(struct napi_struct *napi, |
281 | struct virtqueue *vq) | |
282 | { | |
283 | if (napi_schedule_prep(napi)) { | |
284 | virtqueue_disable_cb(vq); | |
285 | __napi_schedule(napi); | |
286 | } | |
287 | } | |
288 | ||
289 | static void virtqueue_napi_complete(struct napi_struct *napi, | |
290 | struct virtqueue *vq, int processed) | |
291 | { | |
292 | int opaque; | |
293 | ||
294 | opaque = virtqueue_enable_cb_prepare(vq); | |
fdaa767a TM |
295 | if (napi_complete_done(napi, processed)) { |
296 | if (unlikely(virtqueue_poll(vq, opaque))) | |
297 | virtqueue_napi_schedule(napi, vq); | |
298 | } else { | |
299 | virtqueue_disable_cb(vq); | |
300 | } | |
e4e8452a WB |
301 | } |
302 | ||
e9d7417b | 303 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 304 | { |
e9d7417b | 305 | struct virtnet_info *vi = vq->vdev->priv; |
b92f1e67 | 306 | struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; |
296f96fc | 307 | |
2cb9c6ba | 308 | /* Suppress further interrupts. */ |
e9d7417b | 309 | virtqueue_disable_cb(vq); |
11a3a154 | 310 | |
b92f1e67 WB |
311 | if (napi->weight) |
312 | virtqueue_napi_schedule(napi, vq); | |
313 | else | |
314 | /* We were probably waiting for more output buffers. */ | |
315 | netif_wake_subqueue(vi->dev, vq2txq(vq)); | |
296f96fc RR |
316 | } |
317 | ||
28b39bc7 JW |
318 | #define MRG_CTX_HEADER_SHIFT 22 |
319 | static void *mergeable_len_to_ctx(unsigned int truesize, | |
320 | unsigned int headroom) | |
321 | { | |
322 | return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize); | |
323 | } | |
324 | ||
325 | static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx) | |
326 | { | |
327 | return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT; | |
328 | } | |
329 | ||
330 | static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx) | |
331 | { | |
332 | return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1); | |
333 | } | |
334 | ||
3464645a | 335 | /* Called from bottom half context */ |
946fa564 MT |
336 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
337 | struct receive_queue *rq, | |
2613af0e MD |
338 | struct page *page, unsigned int offset, |
339 | unsigned int len, unsigned int truesize) | |
9ab86bbc SM |
340 | { |
341 | struct sk_buff *skb; | |
012873d0 | 342 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
2613af0e | 343 | unsigned int copy, hdr_len, hdr_padded_len; |
9ab86bbc | 344 | char *p; |
fb6813f4 | 345 | |
2613af0e | 346 | p = page_address(page) + offset; |
3f2c31d9 | 347 | |
9ab86bbc | 348 | /* copy small packet so we can reuse these pages for small data */ |
c67f5db8 | 349 | skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); |
9ab86bbc SM |
350 | if (unlikely(!skb)) |
351 | return NULL; | |
3f2c31d9 | 352 | |
9ab86bbc | 353 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 354 | |
012873d0 MT |
355 | hdr_len = vi->hdr_len; |
356 | if (vi->mergeable_rx_bufs) | |
a4a76503 | 357 | hdr_padded_len = sizeof(*hdr); |
012873d0 | 358 | else |
2613af0e | 359 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
3f2c31d9 | 360 | |
9ab86bbc | 361 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 362 | |
9ab86bbc | 363 | len -= hdr_len; |
2613af0e MD |
364 | offset += hdr_padded_len; |
365 | p += hdr_padded_len; | |
3f2c31d9 | 366 | |
9ab86bbc SM |
367 | copy = len; |
368 | if (copy > skb_tailroom(skb)) | |
369 | copy = skb_tailroom(skb); | |
59ae1d12 | 370 | skb_put_data(skb, p, copy); |
3f2c31d9 | 371 | |
9ab86bbc SM |
372 | len -= copy; |
373 | offset += copy; | |
3f2c31d9 | 374 | |
2613af0e MD |
375 | if (vi->mergeable_rx_bufs) { |
376 | if (len) | |
377 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); | |
378 | else | |
379 | put_page(page); | |
380 | return skb; | |
381 | } | |
382 | ||
e878d78b SL |
383 | /* |
384 | * Verify that we can indeed put this data into a skb. | |
385 | * This is here to handle cases when the device erroneously | |
386 | * tries to receive more than is possible. This is usually | |
387 | * the case of a broken device. | |
388 | */ | |
389 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 390 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
391 | dev_kfree_skb(skb); |
392 | return NULL; | |
393 | } | |
2613af0e | 394 | BUG_ON(offset >= PAGE_SIZE); |
9ab86bbc | 395 | while (len) { |
2613af0e MD |
396 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
397 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, | |
398 | frag_size, truesize); | |
399 | len -= frag_size; | |
9ab86bbc SM |
400 | page = (struct page *)page->private; |
401 | offset = 0; | |
402 | } | |
3f2c31d9 | 403 | |
9ab86bbc | 404 | if (page) |
e9d7417b | 405 | give_pages(rq, page); |
3f2c31d9 | 406 | |
9ab86bbc SM |
407 | return skb; |
408 | } | |
3f2c31d9 | 409 | |
186b3c99 JW |
410 | static void virtnet_xdp_flush(struct net_device *dev) |
411 | { | |
412 | struct virtnet_info *vi = netdev_priv(dev); | |
413 | struct send_queue *sq; | |
414 | unsigned int qp; | |
415 | ||
416 | qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); | |
417 | sq = &vi->sq[qp]; | |
418 | ||
419 | virtqueue_kick(sq->vq); | |
420 | } | |
421 | ||
422 | static bool __virtnet_xdp_xmit(struct virtnet_info *vi, | |
423 | struct xdp_buff *xdp) | |
56434a01 | 424 | { |
56434a01 | 425 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
f6b10209 | 426 | unsigned int len; |
722d8283 JF |
427 | struct send_queue *sq; |
428 | unsigned int qp; | |
56434a01 JF |
429 | void *xdp_sent; |
430 | int err; | |
431 | ||
722d8283 JF |
432 | qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); |
433 | sq = &vi->sq[qp]; | |
434 | ||
56434a01 JF |
435 | /* Free up any pending old buffers before queueing new ones. */ |
436 | while ((xdp_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) { | |
f6b10209 | 437 | struct page *sent_page = virt_to_head_page(xdp_sent); |
bb91accf | 438 | |
f6b10209 | 439 | put_page(sent_page); |
bb91accf | 440 | } |
56434a01 | 441 | |
f6b10209 JW |
442 | xdp->data -= vi->hdr_len; |
443 | /* Zero header and leave csum up to XDP layers */ | |
444 | hdr = xdp->data; | |
445 | memset(hdr, 0, vi->hdr_len); | |
bb91accf | 446 | |
f6b10209 | 447 | sg_init_one(sq->sg, xdp->data, xdp->data_end - xdp->data); |
bb91accf | 448 | |
f6b10209 | 449 | err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp->data, GFP_ATOMIC); |
11b7d897 JDB |
450 | if (unlikely(err)) |
451 | return false; /* Caller handle free/refcnt */ | |
56434a01 | 452 | |
a67edbf4 | 453 | return true; |
56434a01 JF |
454 | } |
455 | ||
186b3c99 JW |
456 | static int virtnet_xdp_xmit(struct net_device *dev, struct xdp_buff *xdp) |
457 | { | |
458 | struct virtnet_info *vi = netdev_priv(dev); | |
8dcc5b0a JDB |
459 | struct receive_queue *rq = vi->rq; |
460 | struct bpf_prog *xdp_prog; | |
461 | bool sent; | |
186b3c99 | 462 | |
8dcc5b0a JDB |
463 | /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this |
464 | * indicate XDP resources have been successfully allocated. | |
465 | */ | |
466 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
467 | if (!xdp_prog) | |
468 | return -ENXIO; | |
469 | ||
470 | sent = __virtnet_xdp_xmit(vi, xdp); | |
186b3c99 JW |
471 | if (!sent) |
472 | return -ENOSPC; | |
473 | return 0; | |
474 | } | |
475 | ||
f6b10209 JW |
476 | static unsigned int virtnet_get_headroom(struct virtnet_info *vi) |
477 | { | |
478 | return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0; | |
479 | } | |
480 | ||
4941d472 JW |
481 | /* We copy the packet for XDP in the following cases: |
482 | * | |
483 | * 1) Packet is scattered across multiple rx buffers. | |
484 | * 2) Headroom space is insufficient. | |
485 | * | |
486 | * This is inefficient but it's a temporary condition that | |
487 | * we hit right after XDP is enabled and until queue is refilled | |
488 | * with large buffers with sufficient headroom - so it should affect | |
489 | * at most queue size packets. | |
490 | * Afterwards, the conditions to enable | |
491 | * XDP should preclude the underlying device from sending packets | |
492 | * across multiple buffers (num_buf > 1), and we make sure buffers | |
493 | * have enough headroom. | |
494 | */ | |
495 | static struct page *xdp_linearize_page(struct receive_queue *rq, | |
496 | u16 *num_buf, | |
497 | struct page *p, | |
498 | int offset, | |
499 | int page_off, | |
500 | unsigned int *len) | |
501 | { | |
502 | struct page *page = alloc_page(GFP_ATOMIC); | |
503 | ||
504 | if (!page) | |
505 | return NULL; | |
506 | ||
507 | memcpy(page_address(page) + page_off, page_address(p) + offset, *len); | |
508 | page_off += *len; | |
509 | ||
510 | while (--*num_buf) { | |
3cc81a9a | 511 | int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
4941d472 JW |
512 | unsigned int buflen; |
513 | void *buf; | |
514 | int off; | |
515 | ||
516 | buf = virtqueue_get_buf(rq->vq, &buflen); | |
517 | if (unlikely(!buf)) | |
518 | goto err_buf; | |
519 | ||
520 | p = virt_to_head_page(buf); | |
521 | off = buf - page_address(p); | |
522 | ||
523 | /* guard against a misconfigured or uncooperative backend that | |
524 | * is sending packet larger than the MTU. | |
525 | */ | |
3cc81a9a | 526 | if ((page_off + buflen + tailroom) > PAGE_SIZE) { |
4941d472 JW |
527 | put_page(p); |
528 | goto err_buf; | |
529 | } | |
530 | ||
531 | memcpy(page_address(page) + page_off, | |
532 | page_address(p) + off, buflen); | |
533 | page_off += buflen; | |
534 | put_page(p); | |
535 | } | |
536 | ||
537 | /* Headroom does not contribute to packet length */ | |
538 | *len = page_off - VIRTIO_XDP_HEADROOM; | |
539 | return page; | |
540 | err_buf: | |
541 | __free_pages(page, 0); | |
542 | return NULL; | |
543 | } | |
544 | ||
bb91accf JW |
545 | static struct sk_buff *receive_small(struct net_device *dev, |
546 | struct virtnet_info *vi, | |
547 | struct receive_queue *rq, | |
192f68cf | 548 | void *buf, void *ctx, |
186b3c99 JW |
549 | unsigned int len, |
550 | bool *xdp_xmit) | |
f121159d | 551 | { |
f6b10209 | 552 | struct sk_buff *skb; |
bb91accf | 553 | struct bpf_prog *xdp_prog; |
4941d472 | 554 | unsigned int xdp_headroom = (unsigned long)ctx; |
f6b10209 JW |
555 | unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; |
556 | unsigned int headroom = vi->hdr_len + header_offset; | |
557 | unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + | |
558 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
4941d472 | 559 | struct page *page = virt_to_head_page(buf); |
11b7d897 | 560 | unsigned int delta = 0; |
4941d472 | 561 | struct page *xdp_page; |
11b7d897 JDB |
562 | bool sent; |
563 | int err; | |
564 | ||
012873d0 | 565 | len -= vi->hdr_len; |
f121159d | 566 | |
bb91accf JW |
567 | rcu_read_lock(); |
568 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
569 | if (xdp_prog) { | |
f6b10209 | 570 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; |
0354e4d1 | 571 | struct xdp_buff xdp; |
f6b10209 | 572 | void *orig_data; |
bb91accf JW |
573 | u32 act; |
574 | ||
95dbe9e7 | 575 | if (unlikely(hdr->hdr.gso_type)) |
bb91accf | 576 | goto err_xdp; |
0354e4d1 | 577 | |
4941d472 JW |
578 | if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { |
579 | int offset = buf - page_address(page) + header_offset; | |
580 | unsigned int tlen = len + vi->hdr_len; | |
581 | u16 num_buf = 1; | |
582 | ||
583 | xdp_headroom = virtnet_get_headroom(vi); | |
584 | header_offset = VIRTNET_RX_PAD + xdp_headroom; | |
585 | headroom = vi->hdr_len + header_offset; | |
586 | buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + | |
587 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
588 | xdp_page = xdp_linearize_page(rq, &num_buf, page, | |
589 | offset, header_offset, | |
590 | &tlen); | |
591 | if (!xdp_page) | |
592 | goto err_xdp; | |
593 | ||
594 | buf = page_address(xdp_page); | |
595 | put_page(page); | |
596 | page = xdp_page; | |
597 | } | |
598 | ||
f6b10209 JW |
599 | xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len; |
600 | xdp.data = xdp.data_hard_start + xdp_headroom; | |
de8f3a83 | 601 | xdp_set_data_meta_invalid(&xdp); |
0354e4d1 | 602 | xdp.data_end = xdp.data + len; |
754b8a21 | 603 | xdp.rxq = &rq->xdp_rxq; |
f6b10209 | 604 | orig_data = xdp.data; |
0354e4d1 JF |
605 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
606 | ||
bb91accf JW |
607 | switch (act) { |
608 | case XDP_PASS: | |
2de2f7f4 | 609 | /* Recalculate length in case bpf program changed it */ |
f6b10209 | 610 | delta = orig_data - xdp.data; |
bb91accf JW |
611 | break; |
612 | case XDP_TX: | |
11b7d897 JDB |
613 | sent = __virtnet_xdp_xmit(vi, &xdp); |
614 | if (unlikely(!sent)) { | |
0354e4d1 | 615 | trace_xdp_exception(vi->dev, xdp_prog, act); |
11b7d897 JDB |
616 | goto err_xdp; |
617 | } | |
618 | *xdp_xmit = true; | |
186b3c99 JW |
619 | rcu_read_unlock(); |
620 | goto xdp_xmit; | |
621 | case XDP_REDIRECT: | |
622 | err = xdp_do_redirect(dev, &xdp, xdp_prog); | |
11b7d897 JDB |
623 | if (err) |
624 | goto err_xdp; | |
625 | *xdp_xmit = true; | |
bb91accf JW |
626 | rcu_read_unlock(); |
627 | goto xdp_xmit; | |
bb91accf | 628 | default: |
0354e4d1 JF |
629 | bpf_warn_invalid_xdp_action(act); |
630 | case XDP_ABORTED: | |
631 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
632 | case XDP_DROP: | |
bb91accf JW |
633 | goto err_xdp; |
634 | } | |
635 | } | |
636 | rcu_read_unlock(); | |
637 | ||
f6b10209 JW |
638 | skb = build_skb(buf, buflen); |
639 | if (!skb) { | |
4941d472 | 640 | put_page(page); |
f6b10209 JW |
641 | goto err; |
642 | } | |
643 | skb_reserve(skb, headroom - delta); | |
644 | skb_put(skb, len + delta); | |
645 | if (!delta) { | |
646 | buf += header_offset; | |
647 | memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); | |
648 | } /* keep zeroed vnet hdr since packet was changed by bpf */ | |
649 | ||
650 | err: | |
f121159d | 651 | return skb; |
bb91accf JW |
652 | |
653 | err_xdp: | |
654 | rcu_read_unlock(); | |
655 | dev->stats.rx_dropped++; | |
4941d472 | 656 | put_page(page); |
bb91accf JW |
657 | xdp_xmit: |
658 | return NULL; | |
f121159d MT |
659 | } |
660 | ||
661 | static struct sk_buff *receive_big(struct net_device *dev, | |
946fa564 | 662 | struct virtnet_info *vi, |
f121159d MT |
663 | struct receive_queue *rq, |
664 | void *buf, | |
665 | unsigned int len) | |
666 | { | |
667 | struct page *page = buf; | |
c47a43d3 | 668 | struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE); |
f600b690 | 669 | |
f121159d MT |
670 | if (unlikely(!skb)) |
671 | goto err; | |
672 | ||
673 | return skb; | |
674 | ||
675 | err: | |
676 | dev->stats.rx_dropped++; | |
677 | give_pages(rq, page); | |
678 | return NULL; | |
679 | } | |
680 | ||
8fc3b9e9 | 681 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
fdd819b2 | 682 | struct virtnet_info *vi, |
8fc3b9e9 | 683 | struct receive_queue *rq, |
680557cf MT |
684 | void *buf, |
685 | void *ctx, | |
186b3c99 JW |
686 | unsigned int len, |
687 | bool *xdp_xmit) | |
9ab86bbc | 688 | { |
012873d0 MT |
689 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; |
690 | u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); | |
8fc3b9e9 MT |
691 | struct page *page = virt_to_head_page(buf); |
692 | int offset = buf - page_address(page); | |
f600b690 JF |
693 | struct sk_buff *head_skb, *curr_skb; |
694 | struct bpf_prog *xdp_prog; | |
695 | unsigned int truesize; | |
4941d472 | 696 | unsigned int headroom = mergeable_ctx_to_headroom(ctx); |
11b7d897 | 697 | bool sent; |
3cc81a9a | 698 | int err; |
f600b690 | 699 | |
56434a01 JF |
700 | head_skb = NULL; |
701 | ||
f600b690 JF |
702 | rcu_read_lock(); |
703 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
704 | if (xdp_prog) { | |
72979a6c | 705 | struct page *xdp_page; |
0354e4d1 | 706 | struct xdp_buff xdp; |
0354e4d1 | 707 | void *data; |
f600b690 JF |
708 | u32 act; |
709 | ||
3cc81a9a JW |
710 | /* This happens when rx buffer size is underestimated |
711 | * or headroom is not enough because of the buffer | |
712 | * was refilled before XDP is set. This should only | |
713 | * happen for the first several packets, so we don't | |
714 | * care much about its performance. | |
715 | */ | |
4941d472 JW |
716 | if (unlikely(num_buf > 1 || |
717 | headroom < virtnet_get_headroom(vi))) { | |
72979a6c | 718 | /* linearize data for XDP */ |
56a86f84 | 719 | xdp_page = xdp_linearize_page(rq, &num_buf, |
4941d472 JW |
720 | page, offset, |
721 | VIRTIO_XDP_HEADROOM, | |
722 | &len); | |
72979a6c JF |
723 | if (!xdp_page) |
724 | goto err_xdp; | |
2de2f7f4 | 725 | offset = VIRTIO_XDP_HEADROOM; |
72979a6c JF |
726 | } else { |
727 | xdp_page = page; | |
f600b690 JF |
728 | } |
729 | ||
730 | /* Transient failure which in theory could occur if | |
731 | * in-flight packets from before XDP was enabled reach | |
732 | * the receive path after XDP is loaded. In practice I | |
733 | * was not able to create this condition. | |
734 | */ | |
b00f70b0 | 735 | if (unlikely(hdr->hdr.gso_type)) |
f600b690 JF |
736 | goto err_xdp; |
737 | ||
2de2f7f4 JF |
738 | /* Allow consuming headroom but reserve enough space to push |
739 | * the descriptor on if we get an XDP_TX return code. | |
740 | */ | |
0354e4d1 | 741 | data = page_address(xdp_page) + offset; |
2de2f7f4 | 742 | xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len; |
0354e4d1 | 743 | xdp.data = data + vi->hdr_len; |
de8f3a83 | 744 | xdp_set_data_meta_invalid(&xdp); |
0354e4d1 | 745 | xdp.data_end = xdp.data + (len - vi->hdr_len); |
754b8a21 JDB |
746 | xdp.rxq = &rq->xdp_rxq; |
747 | ||
0354e4d1 JF |
748 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
749 | ||
56434a01 JF |
750 | switch (act) { |
751 | case XDP_PASS: | |
2de2f7f4 JF |
752 | /* recalculate offset to account for any header |
753 | * adjustments. Note other cases do not build an | |
754 | * skb and avoid using offset | |
755 | */ | |
756 | offset = xdp.data - | |
757 | page_address(xdp_page) - vi->hdr_len; | |
758 | ||
1830f893 JW |
759 | /* We can only create skb based on xdp_page. */ |
760 | if (unlikely(xdp_page != page)) { | |
761 | rcu_read_unlock(); | |
762 | put_page(page); | |
763 | head_skb = page_to_skb(vi, rq, xdp_page, | |
2de2f7f4 | 764 | offset, len, PAGE_SIZE); |
1830f893 JW |
765 | return head_skb; |
766 | } | |
56434a01 JF |
767 | break; |
768 | case XDP_TX: | |
11b7d897 JDB |
769 | sent = __virtnet_xdp_xmit(vi, &xdp); |
770 | if (unlikely(!sent)) { | |
0354e4d1 | 771 | trace_xdp_exception(vi->dev, xdp_prog, act); |
11b7d897 JDB |
772 | if (unlikely(xdp_page != page)) |
773 | put_page(xdp_page); | |
774 | goto err_xdp; | |
775 | } | |
776 | *xdp_xmit = true; | |
72979a6c JF |
777 | if (unlikely(xdp_page != page)) |
778 | goto err_xdp; | |
56434a01 JF |
779 | rcu_read_unlock(); |
780 | goto xdp_xmit; | |
3cc81a9a JW |
781 | case XDP_REDIRECT: |
782 | err = xdp_do_redirect(dev, &xdp, xdp_prog); | |
783 | if (err) { | |
784 | if (unlikely(xdp_page != page)) | |
785 | put_page(xdp_page); | |
786 | goto err_xdp; | |
787 | } | |
788 | *xdp_xmit = true; | |
789 | if (unlikely(xdp_page != page)) | |
790 | goto err_xdp; | |
791 | rcu_read_unlock(); | |
792 | goto xdp_xmit; | |
56434a01 | 793 | default: |
0354e4d1 JF |
794 | bpf_warn_invalid_xdp_action(act); |
795 | case XDP_ABORTED: | |
796 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
797 | case XDP_DROP: | |
72979a6c JF |
798 | if (unlikely(xdp_page != page)) |
799 | __free_pages(xdp_page, 0); | |
f600b690 | 800 | goto err_xdp; |
56434a01 | 801 | } |
f600b690 JF |
802 | } |
803 | rcu_read_unlock(); | |
ab7db917 | 804 | |
28b39bc7 JW |
805 | truesize = mergeable_ctx_to_truesize(ctx); |
806 | if (unlikely(len > truesize)) { | |
56da5fd0 | 807 | pr_debug("%s: rx error: len %u exceeds truesize %lu\n", |
680557cf MT |
808 | dev->name, len, (unsigned long)ctx); |
809 | dev->stats.rx_length_errors++; | |
810 | goto err_skb; | |
811 | } | |
28b39bc7 | 812 | |
f600b690 JF |
813 | head_skb = page_to_skb(vi, rq, page, offset, len, truesize); |
814 | curr_skb = head_skb; | |
9ab86bbc | 815 | |
8fc3b9e9 MT |
816 | if (unlikely(!curr_skb)) |
817 | goto err_skb; | |
9ab86bbc | 818 | while (--num_buf) { |
8fc3b9e9 MT |
819 | int num_skb_frags; |
820 | ||
680557cf | 821 | buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); |
03e9f8a0 | 822 | if (unlikely(!buf)) { |
8fc3b9e9 | 823 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
fdd819b2 | 824 | dev->name, num_buf, |
012873d0 MT |
825 | virtio16_to_cpu(vi->vdev, |
826 | hdr->num_buffers)); | |
8fc3b9e9 MT |
827 | dev->stats.rx_length_errors++; |
828 | goto err_buf; | |
3f2c31d9 | 829 | } |
8fc3b9e9 MT |
830 | |
831 | page = virt_to_head_page(buf); | |
28b39bc7 JW |
832 | |
833 | truesize = mergeable_ctx_to_truesize(ctx); | |
834 | if (unlikely(len > truesize)) { | |
56da5fd0 | 835 | pr_debug("%s: rx error: len %u exceeds truesize %lu\n", |
680557cf MT |
836 | dev->name, len, (unsigned long)ctx); |
837 | dev->stats.rx_length_errors++; | |
838 | goto err_skb; | |
839 | } | |
8fc3b9e9 MT |
840 | |
841 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; | |
2613af0e MD |
842 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
843 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
8fc3b9e9 MT |
844 | |
845 | if (unlikely(!nskb)) | |
846 | goto err_skb; | |
2613af0e MD |
847 | if (curr_skb == head_skb) |
848 | skb_shinfo(curr_skb)->frag_list = nskb; | |
849 | else | |
850 | curr_skb->next = nskb; | |
851 | curr_skb = nskb; | |
852 | head_skb->truesize += nskb->truesize; | |
853 | num_skb_frags = 0; | |
854 | } | |
855 | if (curr_skb != head_skb) { | |
856 | head_skb->data_len += len; | |
857 | head_skb->len += len; | |
fb51879d | 858 | head_skb->truesize += truesize; |
2613af0e | 859 | } |
8fc3b9e9 | 860 | offset = buf - page_address(page); |
ba275241 JW |
861 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
862 | put_page(page); | |
863 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
fb51879d | 864 | len, truesize); |
ba275241 JW |
865 | } else { |
866 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
fb51879d | 867 | offset, len, truesize); |
ba275241 | 868 | } |
8fc3b9e9 MT |
869 | } |
870 | ||
5377d758 | 871 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); |
8fc3b9e9 MT |
872 | return head_skb; |
873 | ||
f600b690 JF |
874 | err_xdp: |
875 | rcu_read_unlock(); | |
8fc3b9e9 MT |
876 | err_skb: |
877 | put_page(page); | |
878 | while (--num_buf) { | |
680557cf MT |
879 | buf = virtqueue_get_buf(rq->vq, &len); |
880 | if (unlikely(!buf)) { | |
8fc3b9e9 MT |
881 | pr_debug("%s: rx error: %d buffers missing\n", |
882 | dev->name, num_buf); | |
883 | dev->stats.rx_length_errors++; | |
884 | break; | |
885 | } | |
680557cf | 886 | page = virt_to_head_page(buf); |
8fc3b9e9 | 887 | put_page(page); |
9ab86bbc | 888 | } |
8fc3b9e9 MT |
889 | err_buf: |
890 | dev->stats.rx_dropped++; | |
891 | dev_kfree_skb(head_skb); | |
56434a01 | 892 | xdp_xmit: |
8fc3b9e9 | 893 | return NULL; |
9ab86bbc SM |
894 | } |
895 | ||
61845d20 | 896 | static int receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
186b3c99 | 897 | void *buf, unsigned int len, void **ctx, bool *xdp_xmit) |
9ab86bbc | 898 | { |
e9d7417b | 899 | struct net_device *dev = vi->dev; |
9ab86bbc | 900 | struct sk_buff *skb; |
012873d0 | 901 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
61845d20 | 902 | int ret; |
3f2c31d9 | 903 | |
bcff3162 | 904 | if (unlikely(len < vi->hdr_len + ETH_HLEN)) { |
9ab86bbc SM |
905 | pr_debug("%s: short packet %i\n", dev->name, len); |
906 | dev->stats.rx_length_errors++; | |
ab7db917 | 907 | if (vi->mergeable_rx_bufs) { |
680557cf | 908 | put_page(virt_to_head_page(buf)); |
ab7db917 | 909 | } else if (vi->big_packets) { |
98bfd23c | 910 | give_pages(rq, buf); |
ab7db917 | 911 | } else { |
f6b10209 | 912 | put_page(virt_to_head_page(buf)); |
ab7db917 | 913 | } |
61845d20 | 914 | return 0; |
9ab86bbc | 915 | } |
3f2c31d9 | 916 | |
f121159d | 917 | if (vi->mergeable_rx_bufs) |
186b3c99 | 918 | skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit); |
f121159d | 919 | else if (vi->big_packets) |
946fa564 | 920 | skb = receive_big(dev, vi, rq, buf, len); |
f121159d | 921 | else |
186b3c99 | 922 | skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit); |
f121159d MT |
923 | |
924 | if (unlikely(!skb)) | |
61845d20 | 925 | return 0; |
3f2c31d9 | 926 | |
9ab86bbc | 927 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 928 | |
61845d20 | 929 | ret = skb->len; |
296f96fc | 930 | |
e858fae2 | 931 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) |
10a8d94a | 932 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
296f96fc | 933 | |
e858fae2 MR |
934 | if (virtio_net_hdr_to_skb(skb, &hdr->hdr, |
935 | virtio_is_little_endian(vi->vdev))) { | |
936 | net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", | |
937 | dev->name, hdr->hdr.gso_type, | |
938 | hdr->hdr.gso_size); | |
939 | goto frame_err; | |
296f96fc RR |
940 | } |
941 | ||
d1dc06dc MR |
942 | skb->protocol = eth_type_trans(skb, dev); |
943 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
944 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
945 | ||
0fbd050a | 946 | napi_gro_receive(&rq->napi, skb); |
61845d20 | 947 | return ret; |
296f96fc RR |
948 | |
949 | frame_err: | |
950 | dev->stats.rx_frame_errors++; | |
296f96fc | 951 | dev_kfree_skb(skb); |
61845d20 | 952 | return 0; |
296f96fc RR |
953 | } |
954 | ||
192f68cf JW |
955 | /* Unlike mergeable buffers, all buffers are allocated to the |
956 | * same size, except for the headroom. For this reason we do | |
957 | * not need to use mergeable_len_to_ctx here - it is enough | |
958 | * to store the headroom as the context ignoring the truesize. | |
959 | */ | |
946fa564 MT |
960 | static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
961 | gfp_t gfp) | |
296f96fc | 962 | { |
f6b10209 JW |
963 | struct page_frag *alloc_frag = &rq->alloc_frag; |
964 | char *buf; | |
2de2f7f4 | 965 | unsigned int xdp_headroom = virtnet_get_headroom(vi); |
192f68cf | 966 | void *ctx = (void *)(unsigned long)xdp_headroom; |
f6b10209 | 967 | int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; |
9ab86bbc | 968 | int err; |
3f2c31d9 | 969 | |
f6b10209 JW |
970 | len = SKB_DATA_ALIGN(len) + |
971 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
972 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) | |
9ab86bbc | 973 | return -ENOMEM; |
296f96fc | 974 | |
f6b10209 JW |
975 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
976 | get_page(alloc_frag->page); | |
977 | alloc_frag->offset += len; | |
978 | sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, | |
979 | vi->hdr_len + GOOD_PACKET_LEN); | |
192f68cf | 980 | err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); |
9ab86bbc | 981 | if (err < 0) |
f6b10209 | 982 | put_page(virt_to_head_page(buf)); |
9ab86bbc SM |
983 | return err; |
984 | } | |
97402b96 | 985 | |
012873d0 MT |
986 | static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, |
987 | gfp_t gfp) | |
9ab86bbc | 988 | { |
9ab86bbc SM |
989 | struct page *first, *list = NULL; |
990 | char *p; | |
991 | int i, err, offset; | |
992 | ||
a5835440 RR |
993 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
994 | ||
e9d7417b | 995 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 996 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 997 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
998 | if (!first) { |
999 | if (list) | |
e9d7417b | 1000 | give_pages(rq, list); |
9ab86bbc | 1001 | return -ENOMEM; |
97402b96 | 1002 | } |
e9d7417b | 1003 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 1004 | |
9ab86bbc SM |
1005 | /* chain new page in list head to match sg */ |
1006 | first->private = (unsigned long)list; | |
1007 | list = first; | |
1008 | } | |
296f96fc | 1009 | |
e9d7417b | 1010 | first = get_a_page(rq, gfp); |
9ab86bbc | 1011 | if (!first) { |
e9d7417b | 1012 | give_pages(rq, list); |
9ab86bbc SM |
1013 | return -ENOMEM; |
1014 | } | |
1015 | p = page_address(first); | |
1016 | ||
e9d7417b | 1017 | /* rq->sg[0], rq->sg[1] share the same page */ |
012873d0 MT |
1018 | /* a separated rq->sg[0] for header - required in case !any_header_sg */ |
1019 | sg_set_buf(&rq->sg[0], p, vi->hdr_len); | |
9ab86bbc | 1020 | |
e9d7417b | 1021 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 1022 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 1023 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
1024 | |
1025 | /* chain first in list head */ | |
1026 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
1027 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
1028 | first, gfp); | |
9ab86bbc | 1029 | if (err < 0) |
e9d7417b | 1030 | give_pages(rq, first); |
9ab86bbc SM |
1031 | |
1032 | return err; | |
296f96fc RR |
1033 | } |
1034 | ||
d85b758f | 1035 | static unsigned int get_mergeable_buf_len(struct receive_queue *rq, |
3cc81a9a JW |
1036 | struct ewma_pkt_len *avg_pkt_len, |
1037 | unsigned int room) | |
3f2c31d9 | 1038 | { |
ab7db917 | 1039 | const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
fbf28d78 MD |
1040 | unsigned int len; |
1041 | ||
3cc81a9a JW |
1042 | if (room) |
1043 | return PAGE_SIZE - room; | |
1044 | ||
1045 | len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), | |
f0c3192c | 1046 | rq->min_buf_len, PAGE_SIZE - hdr_len); |
3cc81a9a | 1047 | |
e377fcc8 | 1048 | return ALIGN(len, L1_CACHE_BYTES); |
fbf28d78 MD |
1049 | } |
1050 | ||
2de2f7f4 JF |
1051 | static int add_recvbuf_mergeable(struct virtnet_info *vi, |
1052 | struct receive_queue *rq, gfp_t gfp) | |
fbf28d78 | 1053 | { |
fb51879d | 1054 | struct page_frag *alloc_frag = &rq->alloc_frag; |
2de2f7f4 | 1055 | unsigned int headroom = virtnet_get_headroom(vi); |
3cc81a9a JW |
1056 | unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; |
1057 | unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); | |
fb51879d | 1058 | char *buf; |
680557cf | 1059 | void *ctx; |
3f2c31d9 | 1060 | int err; |
fb51879d | 1061 | unsigned int len, hole; |
3f2c31d9 | 1062 | |
3cc81a9a JW |
1063 | /* Extra tailroom is needed to satisfy XDP's assumption. This |
1064 | * means rx frags coalescing won't work, but consider we've | |
1065 | * disabled GSO for XDP, it won't be a big issue. | |
1066 | */ | |
1067 | len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); | |
1068 | if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) | |
9ab86bbc | 1069 | return -ENOMEM; |
ab7db917 | 1070 | |
fb51879d | 1071 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
2de2f7f4 | 1072 | buf += headroom; /* advance address leaving hole at front of pkt */ |
fb51879d | 1073 | get_page(alloc_frag->page); |
3cc81a9a | 1074 | alloc_frag->offset += len + room; |
fb51879d | 1075 | hole = alloc_frag->size - alloc_frag->offset; |
3cc81a9a | 1076 | if (hole < len + room) { |
ab7db917 MD |
1077 | /* To avoid internal fragmentation, if there is very likely not |
1078 | * enough space for another buffer, add the remaining space to | |
1daa8790 | 1079 | * the current buffer. |
ab7db917 | 1080 | */ |
fb51879d MD |
1081 | len += hole; |
1082 | alloc_frag->offset += hole; | |
1083 | } | |
3f2c31d9 | 1084 | |
fb51879d | 1085 | sg_init_one(rq->sg, buf, len); |
29fda25a | 1086 | ctx = mergeable_len_to_ctx(len, headroom); |
680557cf | 1087 | err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); |
9ab86bbc | 1088 | if (err < 0) |
2613af0e | 1089 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 1090 | |
9ab86bbc SM |
1091 | return err; |
1092 | } | |
3f2c31d9 | 1093 | |
b2baed69 RR |
1094 | /* |
1095 | * Returns false if we couldn't fill entirely (OOM). | |
1096 | * | |
1097 | * Normally run in the receive path, but can also be run from ndo_open | |
1098 | * before we're receiving packets, or from refill_work which is | |
1099 | * careful to disable receiving (using napi_disable). | |
1100 | */ | |
946fa564 MT |
1101 | static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, |
1102 | gfp_t gfp) | |
9ab86bbc SM |
1103 | { |
1104 | int err; | |
1788f495 | 1105 | bool oom; |
3f2c31d9 | 1106 | |
9ab86bbc SM |
1107 | do { |
1108 | if (vi->mergeable_rx_bufs) | |
2de2f7f4 | 1109 | err = add_recvbuf_mergeable(vi, rq, gfp); |
9ab86bbc | 1110 | else if (vi->big_packets) |
012873d0 | 1111 | err = add_recvbuf_big(vi, rq, gfp); |
9ab86bbc | 1112 | else |
946fa564 | 1113 | err = add_recvbuf_small(vi, rq, gfp); |
3f2c31d9 | 1114 | |
1788f495 | 1115 | oom = err == -ENOMEM; |
9ed4cb07 | 1116 | if (err) |
3f2c31d9 | 1117 | break; |
b7dfde95 | 1118 | } while (rq->vq->num_free); |
681daee2 | 1119 | virtqueue_kick(rq->vq); |
3161e453 | 1120 | return !oom; |
3f2c31d9 MM |
1121 | } |
1122 | ||
18445c4d | 1123 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
1124 | { |
1125 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 1126 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 1127 | |
e4e8452a | 1128 | virtqueue_napi_schedule(&rq->napi, rvq); |
296f96fc RR |
1129 | } |
1130 | ||
e4e8452a | 1131 | static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) |
3e9d08ec | 1132 | { |
e4e8452a | 1133 | napi_enable(napi); |
3e9d08ec BR |
1134 | |
1135 | /* If all buffers were filled by other side before we napi_enabled, we | |
e4e8452a WB |
1136 | * won't get another interrupt, so process any outstanding packets now. |
1137 | * Call local_bh_enable after to trigger softIRQ processing. | |
1138 | */ | |
1139 | local_bh_disable(); | |
1140 | virtqueue_napi_schedule(napi, vq); | |
1141 | local_bh_enable(); | |
3e9d08ec BR |
1142 | } |
1143 | ||
b92f1e67 WB |
1144 | static void virtnet_napi_tx_enable(struct virtnet_info *vi, |
1145 | struct virtqueue *vq, | |
1146 | struct napi_struct *napi) | |
1147 | { | |
1148 | if (!napi->weight) | |
1149 | return; | |
1150 | ||
1151 | /* Tx napi touches cachelines on the cpu handling tx interrupts. Only | |
1152 | * enable the feature if this is likely affine with the transmit path. | |
1153 | */ | |
1154 | if (!vi->affinity_hint_set) { | |
1155 | napi->weight = 0; | |
1156 | return; | |
1157 | } | |
1158 | ||
1159 | return virtnet_napi_enable(vq, napi); | |
1160 | } | |
1161 | ||
78a57b48 WB |
1162 | static void virtnet_napi_tx_disable(struct napi_struct *napi) |
1163 | { | |
1164 | if (napi->weight) | |
1165 | napi_disable(napi); | |
1166 | } | |
1167 | ||
3161e453 RR |
1168 | static void refill_work(struct work_struct *work) |
1169 | { | |
e9d7417b JW |
1170 | struct virtnet_info *vi = |
1171 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 1172 | bool still_empty; |
986a4f4d JW |
1173 | int i; |
1174 | ||
55257d72 | 1175 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 1176 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 1177 | |
986a4f4d | 1178 | napi_disable(&rq->napi); |
946fa564 | 1179 | still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); |
e4e8452a | 1180 | virtnet_napi_enable(rq->vq, &rq->napi); |
3161e453 | 1181 | |
986a4f4d JW |
1182 | /* In theory, this can happen: if we don't get any buffers in |
1183 | * we will *never* try to fill again. | |
1184 | */ | |
1185 | if (still_empty) | |
1186 | schedule_delayed_work(&vi->refill, HZ/2); | |
1187 | } | |
3161e453 RR |
1188 | } |
1189 | ||
186b3c99 | 1190 | static int virtnet_receive(struct receive_queue *rq, int budget, bool *xdp_xmit) |
296f96fc | 1191 | { |
e9d7417b | 1192 | struct virtnet_info *vi = rq->vq->vdev->priv; |
61845d20 | 1193 | unsigned int len, received = 0, bytes = 0; |
9ab86bbc | 1194 | void *buf; |
296f96fc | 1195 | |
192f68cf | 1196 | if (!vi->big_packets || vi->mergeable_rx_bufs) { |
680557cf MT |
1197 | void *ctx; |
1198 | ||
1199 | while (received < budget && | |
1200 | (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { | |
186b3c99 | 1201 | bytes += receive_buf(vi, rq, buf, len, ctx, xdp_xmit); |
680557cf MT |
1202 | received++; |
1203 | } | |
1204 | } else { | |
1205 | while (received < budget && | |
1206 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { | |
186b3c99 | 1207 | bytes += receive_buf(vi, rq, buf, len, NULL, xdp_xmit); |
680557cf MT |
1208 | received++; |
1209 | } | |
296f96fc RR |
1210 | } |
1211 | ||
be121f46 | 1212 | if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { |
946fa564 | 1213 | if (!try_fill_recv(vi, rq, GFP_ATOMIC)) |
3b07e9ca | 1214 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 1215 | } |
296f96fc | 1216 | |
d7dfc5cf TM |
1217 | u64_stats_update_begin(&rq->stats.syncp); |
1218 | rq->stats.bytes += bytes; | |
1219 | rq->stats.packets += received; | |
1220 | u64_stats_update_end(&rq->stats.syncp); | |
61845d20 | 1221 | |
2ffa7598 JW |
1222 | return received; |
1223 | } | |
1224 | ||
ea7735d9 WB |
1225 | static void free_old_xmit_skbs(struct send_queue *sq) |
1226 | { | |
1227 | struct sk_buff *skb; | |
1228 | unsigned int len; | |
ea7735d9 WB |
1229 | unsigned int packets = 0; |
1230 | unsigned int bytes = 0; | |
1231 | ||
1232 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { | |
1233 | pr_debug("Sent skb %p\n", skb); | |
1234 | ||
1235 | bytes += skb->len; | |
1236 | packets++; | |
1237 | ||
dadc0736 | 1238 | dev_consume_skb_any(skb); |
ea7735d9 WB |
1239 | } |
1240 | ||
1241 | /* Avoid overhead when no packets have been processed | |
1242 | * happens when called speculatively from start_xmit. | |
1243 | */ | |
1244 | if (!packets) | |
1245 | return; | |
1246 | ||
d7dfc5cf TM |
1247 | u64_stats_update_begin(&sq->stats.syncp); |
1248 | sq->stats.bytes += bytes; | |
1249 | sq->stats.packets += packets; | |
1250 | u64_stats_update_end(&sq->stats.syncp); | |
ea7735d9 WB |
1251 | } |
1252 | ||
7b0411ef WB |
1253 | static void virtnet_poll_cleantx(struct receive_queue *rq) |
1254 | { | |
1255 | struct virtnet_info *vi = rq->vq->vdev->priv; | |
1256 | unsigned int index = vq2rxq(rq->vq); | |
1257 | struct send_queue *sq = &vi->sq[index]; | |
1258 | struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); | |
1259 | ||
1260 | if (!sq->napi.weight) | |
1261 | return; | |
1262 | ||
1263 | if (__netif_tx_trylock(txq)) { | |
1264 | free_old_xmit_skbs(sq); | |
1265 | __netif_tx_unlock(txq); | |
1266 | } | |
1267 | ||
1268 | if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) | |
1269 | netif_tx_wake_queue(txq); | |
1270 | } | |
1271 | ||
2ffa7598 JW |
1272 | static int virtnet_poll(struct napi_struct *napi, int budget) |
1273 | { | |
1274 | struct receive_queue *rq = | |
1275 | container_of(napi, struct receive_queue, napi); | |
9267c430 JW |
1276 | struct virtnet_info *vi = rq->vq->vdev->priv; |
1277 | struct send_queue *sq; | |
1278 | unsigned int received, qp; | |
186b3c99 | 1279 | bool xdp_xmit = false; |
2ffa7598 | 1280 | |
7b0411ef WB |
1281 | virtnet_poll_cleantx(rq); |
1282 | ||
186b3c99 | 1283 | received = virtnet_receive(rq, budget, &xdp_xmit); |
2ffa7598 | 1284 | |
8329d98e | 1285 | /* Out of packets? */ |
e4e8452a WB |
1286 | if (received < budget) |
1287 | virtqueue_napi_complete(napi, rq->vq, received); | |
296f96fc | 1288 | |
9267c430 JW |
1289 | if (xdp_xmit) { |
1290 | qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + | |
1291 | smp_processor_id(); | |
1292 | sq = &vi->sq[qp]; | |
1293 | virtqueue_kick(sq->vq); | |
186b3c99 | 1294 | xdp_do_flush_map(); |
9267c430 | 1295 | } |
186b3c99 | 1296 | |
296f96fc RR |
1297 | return received; |
1298 | } | |
1299 | ||
986a4f4d JW |
1300 | static int virtnet_open(struct net_device *dev) |
1301 | { | |
1302 | struct virtnet_info *vi = netdev_priv(dev); | |
754b8a21 | 1303 | int i, err; |
986a4f4d | 1304 | |
e4166625 JW |
1305 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1306 | if (i < vi->curr_queue_pairs) | |
1307 | /* Make sure we have some buffers: if oom use wq. */ | |
946fa564 | 1308 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
e4166625 | 1309 | schedule_delayed_work(&vi->refill, 0); |
754b8a21 JDB |
1310 | |
1311 | err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i); | |
1312 | if (err < 0) | |
1313 | return err; | |
1314 | ||
e4e8452a | 1315 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
b92f1e67 | 1316 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); |
986a4f4d JW |
1317 | } |
1318 | ||
1319 | return 0; | |
1320 | } | |
1321 | ||
b92f1e67 WB |
1322 | static int virtnet_poll_tx(struct napi_struct *napi, int budget) |
1323 | { | |
1324 | struct send_queue *sq = container_of(napi, struct send_queue, napi); | |
1325 | struct virtnet_info *vi = sq->vq->vdev->priv; | |
1326 | struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, vq2txq(sq->vq)); | |
1327 | ||
1328 | __netif_tx_lock(txq, raw_smp_processor_id()); | |
1329 | free_old_xmit_skbs(sq); | |
1330 | __netif_tx_unlock(txq); | |
1331 | ||
1332 | virtqueue_napi_complete(napi, sq->vq, 0); | |
1333 | ||
1334 | if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) | |
1335 | netif_tx_wake_queue(txq); | |
1336 | ||
1337 | return 0; | |
1338 | } | |
1339 | ||
e9d7417b | 1340 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 1341 | { |
012873d0 | 1342 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
296f96fc | 1343 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 1344 | struct virtnet_info *vi = sq->vq->vdev->priv; |
e2fcad58 | 1345 | int num_sg; |
012873d0 | 1346 | unsigned hdr_len = vi->hdr_len; |
e7428e95 | 1347 | bool can_push; |
296f96fc | 1348 | |
e174961c | 1349 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
1350 | |
1351 | can_push = vi->any_header_sg && | |
1352 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
1353 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
1354 | /* Even if we can, don't push here yet as this would skew | |
1355 | * csum_start offset below. */ | |
1356 | if (can_push) | |
012873d0 | 1357 | hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); |
e7428e95 MT |
1358 | else |
1359 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 1360 | |
e858fae2 | 1361 | if (virtio_net_hdr_from_skb(skb, &hdr->hdr, |
6391a448 | 1362 | virtio_is_little_endian(vi->vdev), false)) |
e858fae2 | 1363 | BUG(); |
296f96fc | 1364 | |
3f2c31d9 | 1365 | if (vi->mergeable_rx_bufs) |
012873d0 | 1366 | hdr->num_buffers = 0; |
3f2c31d9 | 1367 | |
547c890c | 1368 | sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); |
e7428e95 MT |
1369 | if (can_push) { |
1370 | __skb_push(skb, hdr_len); | |
1371 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
e2fcad58 JD |
1372 | if (unlikely(num_sg < 0)) |
1373 | return num_sg; | |
e7428e95 MT |
1374 | /* Pull header back to avoid skew in tx bytes calculations. */ |
1375 | __skb_pull(skb, hdr_len); | |
1376 | } else { | |
1377 | sg_set_buf(sq->sg, hdr, hdr_len); | |
e2fcad58 JD |
1378 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); |
1379 | if (unlikely(num_sg < 0)) | |
1380 | return num_sg; | |
1381 | num_sg++; | |
e7428e95 | 1382 | } |
9dc7b9e4 | 1383 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
1384 | } |
1385 | ||
424efe9c | 1386 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
1387 | { |
1388 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
1389 | int qnum = skb_get_queue_mapping(skb); |
1390 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 1391 | int err; |
4b7fd2e6 MT |
1392 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
1393 | bool kick = !skb->xmit_more; | |
b92f1e67 | 1394 | bool use_napi = sq->napi.weight; |
2cb9c6ba | 1395 | |
2cb9c6ba | 1396 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 1397 | free_old_xmit_skbs(sq); |
99ffc696 | 1398 | |
bdb12e0d WB |
1399 | if (use_napi && kick) |
1400 | virtqueue_enable_cb_delayed(sq->vq); | |
1401 | ||
074c3582 JK |
1402 | /* timestamp packet in software */ |
1403 | skb_tx_timestamp(skb); | |
1404 | ||
03f191ba | 1405 | /* Try to transmit */ |
b7dfde95 | 1406 | err = xmit_skb(sq, skb); |
48925e37 | 1407 | |
9ed4cb07 | 1408 | /* This should not happen! */ |
681daee2 | 1409 | if (unlikely(err)) { |
9ed4cb07 RR |
1410 | dev->stats.tx_fifo_errors++; |
1411 | if (net_ratelimit()) | |
1412 | dev_warn(&dev->dev, | |
b7dfde95 | 1413 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d | 1414 | dev->stats.tx_dropped++; |
85e94525 | 1415 | dev_kfree_skb_any(skb); |
58eba97d | 1416 | return NETDEV_TX_OK; |
296f96fc | 1417 | } |
03f191ba | 1418 | |
48925e37 | 1419 | /* Don't wait up for transmitted skbs to be freed. */ |
b92f1e67 WB |
1420 | if (!use_napi) { |
1421 | skb_orphan(skb); | |
1422 | nf_reset(skb); | |
1423 | } | |
48925e37 | 1424 | |
60302ff6 MT |
1425 | /* If running out of space, stop queue to avoid getting packets that we |
1426 | * are then unable to transmit. | |
1427 | * An alternative would be to force queuing layer to requeue the skb by | |
1428 | * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be | |
1429 | * returned in a normal path of operation: it means that driver is not | |
1430 | * maintaining the TX queue stop/start state properly, and causes | |
1431 | * the stack to do a non-trivial amount of useless work. | |
1432 | * Since most packets only take 1 or 2 ring slots, stopping the queue | |
1433 | * early means 16 slots are typically wasted. | |
d631b94e | 1434 | */ |
b7dfde95 | 1435 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 1436 | netif_stop_subqueue(dev, qnum); |
b92f1e67 WB |
1437 | if (!use_napi && |
1438 | unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { | |
48925e37 | 1439 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
1440 | free_old_xmit_skbs(sq); |
1441 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 1442 | netif_start_subqueue(dev, qnum); |
e9d7417b | 1443 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
1444 | } |
1445 | } | |
99ffc696 | 1446 | } |
48925e37 | 1447 | |
4b7fd2e6 | 1448 | if (kick || netif_xmit_stopped(txq)) |
0b725a2c | 1449 | virtqueue_kick(sq->vq); |
296f96fc | 1450 | |
0b725a2c | 1451 | return NETDEV_TX_OK; |
c223a078 DM |
1452 | } |
1453 | ||
40cbfc37 AK |
1454 | /* |
1455 | * Send command via the control virtqueue and check status. Commands | |
1456 | * supported by the hypervisor, as indicated by feature bits, should | |
788a8b6d | 1457 | * never fail unless improperly formatted. |
40cbfc37 AK |
1458 | */ |
1459 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
d24bae32 | 1460 | struct scatterlist *out) |
40cbfc37 | 1461 | { |
f7bc9594 | 1462 | struct scatterlist *sgs[4], hdr, stat; |
d24bae32 | 1463 | unsigned out_num = 0, tmp; |
40cbfc37 AK |
1464 | |
1465 | /* Caller should know better */ | |
f7bc9594 | 1466 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 | 1467 | |
12e57169 MT |
1468 | vi->ctrl->status = ~0; |
1469 | vi->ctrl->hdr.class = class; | |
1470 | vi->ctrl->hdr.cmd = cmd; | |
f7bc9594 | 1471 | /* Add header */ |
12e57169 | 1472 | sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); |
f7bc9594 | 1473 | sgs[out_num++] = &hdr; |
40cbfc37 | 1474 | |
f7bc9594 RR |
1475 | if (out) |
1476 | sgs[out_num++] = out; | |
40cbfc37 | 1477 | |
f7bc9594 | 1478 | /* Add return status. */ |
12e57169 | 1479 | sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); |
d24bae32 | 1480 | sgs[out_num] = &stat; |
40cbfc37 | 1481 | |
d24bae32 | 1482 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
a7c58146 | 1483 | virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
40cbfc37 | 1484 | |
67975901 | 1485 | if (unlikely(!virtqueue_kick(vi->cvq))) |
12e57169 | 1486 | return vi->ctrl->status == VIRTIO_NET_OK; |
40cbfc37 AK |
1487 | |
1488 | /* Spin for a response, the kick causes an ioport write, trapping | |
1489 | * into the hypervisor, so the request should be handled immediately. | |
1490 | */ | |
047b9b94 HG |
1491 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
1492 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
1493 | cpu_relax(); |
1494 | ||
12e57169 | 1495 | return vi->ctrl->status == VIRTIO_NET_OK; |
40cbfc37 AK |
1496 | } |
1497 | ||
9c46f6d4 AW |
1498 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
1499 | { | |
1500 | struct virtnet_info *vi = netdev_priv(dev); | |
1501 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 1502 | int ret; |
e37e2ff3 | 1503 | struct sockaddr *addr; |
7e58d5ae | 1504 | struct scatterlist sg; |
9c46f6d4 | 1505 | |
801822d1 | 1506 | addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); |
e37e2ff3 AL |
1507 | if (!addr) |
1508 | return -ENOMEM; | |
e37e2ff3 AL |
1509 | |
1510 | ret = eth_prepare_mac_addr_change(dev, addr); | |
f2f2c8b4 | 1511 | if (ret) |
e37e2ff3 | 1512 | goto out; |
9c46f6d4 | 1513 | |
7e58d5ae AK |
1514 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
1515 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
1516 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1517 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
7e58d5ae AK |
1518 | dev_warn(&vdev->dev, |
1519 | "Failed to set mac address by vq command.\n"); | |
e37e2ff3 AL |
1520 | ret = -EINVAL; |
1521 | goto out; | |
7e58d5ae | 1522 | } |
7e93a02f MT |
1523 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && |
1524 | !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
855e0c52 RR |
1525 | unsigned int i; |
1526 | ||
1527 | /* Naturally, this has an atomicity problem. */ | |
1528 | for (i = 0; i < dev->addr_len; i++) | |
1529 | virtio_cwrite8(vdev, | |
1530 | offsetof(struct virtio_net_config, mac) + | |
1531 | i, addr->sa_data[i]); | |
7e58d5ae AK |
1532 | } |
1533 | ||
1534 | eth_commit_mac_addr_change(dev, p); | |
e37e2ff3 | 1535 | ret = 0; |
9c46f6d4 | 1536 | |
e37e2ff3 AL |
1537 | out: |
1538 | kfree(addr); | |
1539 | return ret; | |
9c46f6d4 AW |
1540 | } |
1541 | ||
bc1f4470 | 1542 | static void virtnet_stats(struct net_device *dev, |
1543 | struct rtnl_link_stats64 *tot) | |
3fa2a1df | 1544 | { |
1545 | struct virtnet_info *vi = netdev_priv(dev); | |
3fa2a1df | 1546 | unsigned int start; |
d7dfc5cf | 1547 | int i; |
3fa2a1df | 1548 | |
d7dfc5cf | 1549 | for (i = 0; i < vi->max_queue_pairs; i++) { |
3fa2a1df | 1550 | u64 tpackets, tbytes, rpackets, rbytes; |
d7dfc5cf TM |
1551 | struct receive_queue *rq = &vi->rq[i]; |
1552 | struct send_queue *sq = &vi->sq[i]; | |
3fa2a1df | 1553 | |
1554 | do { | |
d7dfc5cf TM |
1555 | start = u64_stats_fetch_begin_irq(&sq->stats.syncp); |
1556 | tpackets = sq->stats.packets; | |
1557 | tbytes = sq->stats.bytes; | |
1558 | } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); | |
83a27052 ED |
1559 | |
1560 | do { | |
d7dfc5cf TM |
1561 | start = u64_stats_fetch_begin_irq(&rq->stats.syncp); |
1562 | rpackets = rq->stats.packets; | |
1563 | rbytes = rq->stats.bytes; | |
1564 | } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); | |
3fa2a1df | 1565 | |
1566 | tot->rx_packets += rpackets; | |
1567 | tot->tx_packets += tpackets; | |
1568 | tot->rx_bytes += rbytes; | |
1569 | tot->tx_bytes += tbytes; | |
1570 | } | |
1571 | ||
1572 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 1573 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 1574 | tot->rx_dropped = dev->stats.rx_dropped; |
1575 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
1576 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
3fa2a1df | 1577 | } |
1578 | ||
da74e89d AS |
1579 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1580 | static void virtnet_netpoll(struct net_device *dev) | |
1581 | { | |
1582 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1583 | int i; |
da74e89d | 1584 | |
986a4f4d JW |
1585 | for (i = 0; i < vi->curr_queue_pairs; i++) |
1586 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
1587 | } |
1588 | #endif | |
1589 | ||
586d17c5 JW |
1590 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
1591 | { | |
1592 | rtnl_lock(); | |
1593 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
d24bae32 | 1594 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
586d17c5 JW |
1595 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
1596 | rtnl_unlock(); | |
1597 | } | |
1598 | ||
47315329 | 1599 | static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
986a4f4d JW |
1600 | { |
1601 | struct scatterlist sg; | |
986a4f4d JW |
1602 | struct net_device *dev = vi->dev; |
1603 | ||
1604 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
1605 | return 0; | |
1606 | ||
12e57169 MT |
1607 | vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
1608 | sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); | |
986a4f4d JW |
1609 | |
1610 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
d24bae32 | 1611 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
986a4f4d JW |
1612 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
1613 | queue_pairs); | |
1614 | return -EINVAL; | |
55257d72 | 1615 | } else { |
986a4f4d | 1616 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
1617 | /* virtnet_open() will refill when device is going to up. */ |
1618 | if (dev->flags & IFF_UP) | |
1619 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 1620 | } |
986a4f4d JW |
1621 | |
1622 | return 0; | |
1623 | } | |
1624 | ||
47315329 JF |
1625 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
1626 | { | |
1627 | int err; | |
1628 | ||
1629 | rtnl_lock(); | |
1630 | err = _virtnet_set_queues(vi, queue_pairs); | |
1631 | rtnl_unlock(); | |
1632 | return err; | |
1633 | } | |
1634 | ||
296f96fc RR |
1635 | static int virtnet_close(struct net_device *dev) |
1636 | { | |
1637 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1638 | int i; |
296f96fc | 1639 | |
b2baed69 RR |
1640 | /* Make sure refill_work doesn't re-enable napi! */ |
1641 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d | 1642 | |
b92f1e67 | 1643 | for (i = 0; i < vi->max_queue_pairs; i++) { |
754b8a21 | 1644 | xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); |
986a4f4d | 1645 | napi_disable(&vi->rq[i].napi); |
78a57b48 | 1646 | virtnet_napi_tx_disable(&vi->sq[i].napi); |
b92f1e67 | 1647 | } |
296f96fc | 1648 | |
296f96fc RR |
1649 | return 0; |
1650 | } | |
1651 | ||
2af7698e AW |
1652 | static void virtnet_set_rx_mode(struct net_device *dev) |
1653 | { | |
1654 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 1655 | struct scatterlist sg[2]; |
f565a7c2 | 1656 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 1657 | struct netdev_hw_addr *ha; |
32e7bfc4 | 1658 | int uc_count; |
4cd24eaf | 1659 | int mc_count; |
f565a7c2 AW |
1660 | void *buf; |
1661 | int i; | |
2af7698e | 1662 | |
788a8b6d | 1663 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
2af7698e AW |
1664 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
1665 | return; | |
1666 | ||
12e57169 MT |
1667 | vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); |
1668 | vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1669 | |
12e57169 | 1670 | sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); |
2af7698e AW |
1671 | |
1672 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1673 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
2af7698e | 1674 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
12e57169 | 1675 | vi->ctrl->promisc ? "en" : "dis"); |
2af7698e | 1676 | |
12e57169 | 1677 | sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); |
2af7698e AW |
1678 | |
1679 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1680 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
2af7698e | 1681 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
12e57169 | 1682 | vi->ctrl->allmulti ? "en" : "dis"); |
f565a7c2 | 1683 | |
32e7bfc4 | 1684 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1685 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1686 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1687 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1688 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1689 | mac_data = buf; | |
e68ed8f0 | 1690 | if (!buf) |
f565a7c2 | 1691 | return; |
f565a7c2 | 1692 | |
23e258e1 AW |
1693 | sg_init_table(sg, 2); |
1694 | ||
f565a7c2 | 1695 | /* Store the unicast list and count in the front of the buffer */ |
fdd819b2 | 1696 | mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); |
ccffad25 | 1697 | i = 0; |
32e7bfc4 | 1698 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1699 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1700 | |
1701 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1702 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1703 | |
1704 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1705 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1706 | |
fdd819b2 | 1707 | mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); |
567ec874 | 1708 | i = 0; |
22bedad3 JP |
1709 | netdev_for_each_mc_addr(ha, dev) |
1710 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1711 | |
1712 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1713 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1714 | |
1715 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1716 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
99e872ae | 1717 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
f565a7c2 AW |
1718 | |
1719 | kfree(buf); | |
2af7698e AW |
1720 | } |
1721 | ||
80d5c368 PM |
1722 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
1723 | __be16 proto, u16 vid) | |
0bde9569 AW |
1724 | { |
1725 | struct virtnet_info *vi = netdev_priv(dev); | |
1726 | struct scatterlist sg; | |
1727 | ||
d7fad4c8 | 1728 | vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); |
12e57169 | 1729 | sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); |
0bde9569 AW |
1730 | |
1731 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1732 | VIRTIO_NET_CTRL_VLAN_ADD, &sg)) |
0bde9569 | 1733 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1734 | return 0; |
0bde9569 AW |
1735 | } |
1736 | ||
80d5c368 PM |
1737 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1738 | __be16 proto, u16 vid) | |
0bde9569 AW |
1739 | { |
1740 | struct virtnet_info *vi = netdev_priv(dev); | |
1741 | struct scatterlist sg; | |
1742 | ||
d7fad4c8 | 1743 | vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); |
12e57169 | 1744 | sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); |
0bde9569 AW |
1745 | |
1746 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1747 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
0bde9569 | 1748 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1749 | return 0; |
0bde9569 AW |
1750 | } |
1751 | ||
8898c21c | 1752 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
986a4f4d JW |
1753 | { |
1754 | int i; | |
1755 | ||
8898c21c WG |
1756 | if (vi->affinity_hint_set) { |
1757 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
47be2479 WG |
1758 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
1759 | virtqueue_set_affinity(vi->sq[i].vq, -1); | |
1760 | } | |
1761 | ||
8898c21c WG |
1762 | vi->affinity_hint_set = false; |
1763 | } | |
8898c21c | 1764 | } |
47be2479 | 1765 | |
8898c21c WG |
1766 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1767 | { | |
1768 | int i; | |
1769 | int cpu; | |
986a4f4d JW |
1770 | |
1771 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1772 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1773 | * setting the affinity hint to eliminate the contention. | |
1774 | */ | |
8898c21c WG |
1775 | if (vi->curr_queue_pairs == 1 || |
1776 | vi->max_queue_pairs != num_online_cpus()) { | |
1777 | virtnet_clean_affinity(vi, -1); | |
1778 | return; | |
986a4f4d JW |
1779 | } |
1780 | ||
8898c21c WG |
1781 | i = 0; |
1782 | for_each_online_cpu(cpu) { | |
986a4f4d JW |
1783 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
1784 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
9bb8ca86 | 1785 | netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); |
8898c21c | 1786 | i++; |
986a4f4d JW |
1787 | } |
1788 | ||
8898c21c | 1789 | vi->affinity_hint_set = true; |
986a4f4d JW |
1790 | } |
1791 | ||
8017c279 | 1792 | static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) |
8de4b2f3 | 1793 | { |
8017c279 SAS |
1794 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, |
1795 | node); | |
1796 | virtnet_set_affinity(vi); | |
1797 | return 0; | |
1798 | } | |
8de4b2f3 | 1799 | |
8017c279 SAS |
1800 | static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) |
1801 | { | |
1802 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
1803 | node_dead); | |
1804 | virtnet_set_affinity(vi); | |
1805 | return 0; | |
1806 | } | |
3ab098df | 1807 | |
8017c279 SAS |
1808 | static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) |
1809 | { | |
1810 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
1811 | node); | |
1812 | ||
1813 | virtnet_clean_affinity(vi, cpu); | |
1814 | return 0; | |
1815 | } | |
1816 | ||
1817 | static enum cpuhp_state virtionet_online; | |
1818 | ||
1819 | static int virtnet_cpu_notif_add(struct virtnet_info *vi) | |
1820 | { | |
1821 | int ret; | |
1822 | ||
1823 | ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); | |
1824 | if (ret) | |
1825 | return ret; | |
1826 | ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
1827 | &vi->node_dead); | |
1828 | if (!ret) | |
1829 | return ret; | |
1830 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
1831 | return ret; | |
1832 | } | |
1833 | ||
1834 | static void virtnet_cpu_notif_remove(struct virtnet_info *vi) | |
1835 | { | |
1836 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
1837 | cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
1838 | &vi->node_dead); | |
986a4f4d JW |
1839 | } |
1840 | ||
8f9f4668 RJ |
1841 | static void virtnet_get_ringparam(struct net_device *dev, |
1842 | struct ethtool_ringparam *ring) | |
1843 | { | |
1844 | struct virtnet_info *vi = netdev_priv(dev); | |
1845 | ||
986a4f4d JW |
1846 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1847 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1848 | ring->rx_pending = ring->rx_max_pending; |
1849 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1850 | } |
1851 | ||
66846048 RJ |
1852 | |
1853 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1854 | struct ethtool_drvinfo *info) | |
1855 | { | |
1856 | struct virtnet_info *vi = netdev_priv(dev); | |
1857 | struct virtio_device *vdev = vi->vdev; | |
1858 | ||
1859 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1860 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1861 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1862 | ||
1863 | } | |
1864 | ||
d73bcd2c JW |
1865 | /* TODO: Eliminate OOO packets during switching */ |
1866 | static int virtnet_set_channels(struct net_device *dev, | |
1867 | struct ethtool_channels *channels) | |
1868 | { | |
1869 | struct virtnet_info *vi = netdev_priv(dev); | |
1870 | u16 queue_pairs = channels->combined_count; | |
1871 | int err; | |
1872 | ||
1873 | /* We don't support separate rx/tx channels. | |
1874 | * We don't allow setting 'other' channels. | |
1875 | */ | |
1876 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1877 | return -EINVAL; | |
1878 | ||
c18e9cd6 | 1879 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
d73bcd2c JW |
1880 | return -EINVAL; |
1881 | ||
f600b690 JF |
1882 | /* For now we don't support modifying channels while XDP is loaded |
1883 | * also when XDP is loaded all RX queues have XDP programs so we only | |
1884 | * need to check a single RX queue. | |
1885 | */ | |
1886 | if (vi->rq[0].xdp_prog) | |
1887 | return -EINVAL; | |
1888 | ||
47be2479 | 1889 | get_online_cpus(); |
47315329 | 1890 | err = _virtnet_set_queues(vi, queue_pairs); |
d73bcd2c JW |
1891 | if (!err) { |
1892 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1893 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1894 | ||
8898c21c | 1895 | virtnet_set_affinity(vi); |
d73bcd2c | 1896 | } |
47be2479 | 1897 | put_online_cpus(); |
d73bcd2c JW |
1898 | |
1899 | return err; | |
1900 | } | |
1901 | ||
d7dfc5cf TM |
1902 | static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) |
1903 | { | |
1904 | struct virtnet_info *vi = netdev_priv(dev); | |
1905 | char *p = (char *)data; | |
1906 | unsigned int i, j; | |
1907 | ||
1908 | switch (stringset) { | |
1909 | case ETH_SS_STATS: | |
1910 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
1911 | for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { | |
1912 | snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s", | |
1913 | i, virtnet_rq_stats_desc[j].desc); | |
1914 | p += ETH_GSTRING_LEN; | |
1915 | } | |
1916 | } | |
1917 | ||
1918 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
1919 | for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { | |
1920 | snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s", | |
1921 | i, virtnet_sq_stats_desc[j].desc); | |
1922 | p += ETH_GSTRING_LEN; | |
1923 | } | |
1924 | } | |
1925 | break; | |
1926 | } | |
1927 | } | |
1928 | ||
1929 | static int virtnet_get_sset_count(struct net_device *dev, int sset) | |
1930 | { | |
1931 | struct virtnet_info *vi = netdev_priv(dev); | |
1932 | ||
1933 | switch (sset) { | |
1934 | case ETH_SS_STATS: | |
1935 | return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + | |
1936 | VIRTNET_SQ_STATS_LEN); | |
1937 | default: | |
1938 | return -EOPNOTSUPP; | |
1939 | } | |
1940 | } | |
1941 | ||
1942 | static void virtnet_get_ethtool_stats(struct net_device *dev, | |
1943 | struct ethtool_stats *stats, u64 *data) | |
1944 | { | |
1945 | struct virtnet_info *vi = netdev_priv(dev); | |
1946 | unsigned int idx = 0, start, i, j; | |
1947 | const u8 *stats_base; | |
1948 | size_t offset; | |
1949 | ||
1950 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
1951 | struct receive_queue *rq = &vi->rq[i]; | |
1952 | ||
1953 | stats_base = (u8 *)&rq->stats; | |
1954 | do { | |
1955 | start = u64_stats_fetch_begin_irq(&rq->stats.syncp); | |
1956 | for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { | |
1957 | offset = virtnet_rq_stats_desc[j].offset; | |
1958 | data[idx + j] = *(u64 *)(stats_base + offset); | |
1959 | } | |
1960 | } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); | |
1961 | idx += VIRTNET_RQ_STATS_LEN; | |
1962 | } | |
1963 | ||
1964 | for (i = 0; i < vi->curr_queue_pairs; i++) { | |
1965 | struct send_queue *sq = &vi->sq[i]; | |
1966 | ||
1967 | stats_base = (u8 *)&sq->stats; | |
1968 | do { | |
1969 | start = u64_stats_fetch_begin_irq(&sq->stats.syncp); | |
1970 | for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { | |
1971 | offset = virtnet_sq_stats_desc[j].offset; | |
1972 | data[idx + j] = *(u64 *)(stats_base + offset); | |
1973 | } | |
1974 | } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); | |
1975 | idx += VIRTNET_SQ_STATS_LEN; | |
1976 | } | |
1977 | } | |
1978 | ||
d73bcd2c JW |
1979 | static void virtnet_get_channels(struct net_device *dev, |
1980 | struct ethtool_channels *channels) | |
1981 | { | |
1982 | struct virtnet_info *vi = netdev_priv(dev); | |
1983 | ||
1984 | channels->combined_count = vi->curr_queue_pairs; | |
1985 | channels->max_combined = vi->max_queue_pairs; | |
1986 | channels->max_other = 0; | |
1987 | channels->rx_count = 0; | |
1988 | channels->tx_count = 0; | |
1989 | channels->other_count = 0; | |
1990 | } | |
1991 | ||
16032be5 | 1992 | /* Check if the user is trying to change anything besides speed/duplex */ |
ebb6b4b1 PR |
1993 | static bool |
1994 | virtnet_validate_ethtool_cmd(const struct ethtool_link_ksettings *cmd) | |
16032be5 | 1995 | { |
ebb6b4b1 PR |
1996 | struct ethtool_link_ksettings diff1 = *cmd; |
1997 | struct ethtool_link_ksettings diff2 = {}; | |
16032be5 | 1998 | |
0cf3ace9 NA |
1999 | /* cmd is always set so we need to clear it, validate the port type |
2000 | * and also without autonegotiation we can ignore advertising | |
2001 | */ | |
ebb6b4b1 PR |
2002 | diff1.base.speed = 0; |
2003 | diff2.base.port = PORT_OTHER; | |
2004 | ethtool_link_ksettings_zero_link_mode(&diff1, advertising); | |
2005 | diff1.base.duplex = 0; | |
2006 | diff1.base.cmd = 0; | |
2007 | diff1.base.link_mode_masks_nwords = 0; | |
2008 | ||
2009 | return !memcmp(&diff1.base, &diff2.base, sizeof(diff1.base)) && | |
2010 | bitmap_empty(diff1.link_modes.supported, | |
2011 | __ETHTOOL_LINK_MODE_MASK_NBITS) && | |
2012 | bitmap_empty(diff1.link_modes.advertising, | |
2013 | __ETHTOOL_LINK_MODE_MASK_NBITS) && | |
2014 | bitmap_empty(diff1.link_modes.lp_advertising, | |
2015 | __ETHTOOL_LINK_MODE_MASK_NBITS); | |
16032be5 NA |
2016 | } |
2017 | ||
ebb6b4b1 PR |
2018 | static int virtnet_set_link_ksettings(struct net_device *dev, |
2019 | const struct ethtool_link_ksettings *cmd) | |
16032be5 NA |
2020 | { |
2021 | struct virtnet_info *vi = netdev_priv(dev); | |
2022 | u32 speed; | |
2023 | ||
ebb6b4b1 | 2024 | speed = cmd->base.speed; |
16032be5 NA |
2025 | /* don't allow custom speed and duplex */ |
2026 | if (!ethtool_validate_speed(speed) || | |
ebb6b4b1 | 2027 | !ethtool_validate_duplex(cmd->base.duplex) || |
16032be5 NA |
2028 | !virtnet_validate_ethtool_cmd(cmd)) |
2029 | return -EINVAL; | |
2030 | vi->speed = speed; | |
ebb6b4b1 | 2031 | vi->duplex = cmd->base.duplex; |
16032be5 NA |
2032 | |
2033 | return 0; | |
2034 | } | |
2035 | ||
ebb6b4b1 PR |
2036 | static int virtnet_get_link_ksettings(struct net_device *dev, |
2037 | struct ethtool_link_ksettings *cmd) | |
16032be5 NA |
2038 | { |
2039 | struct virtnet_info *vi = netdev_priv(dev); | |
2040 | ||
ebb6b4b1 PR |
2041 | cmd->base.speed = vi->speed; |
2042 | cmd->base.duplex = vi->duplex; | |
2043 | cmd->base.port = PORT_OTHER; | |
16032be5 NA |
2044 | |
2045 | return 0; | |
2046 | } | |
2047 | ||
2048 | static void virtnet_init_settings(struct net_device *dev) | |
2049 | { | |
2050 | struct virtnet_info *vi = netdev_priv(dev); | |
2051 | ||
2052 | vi->speed = SPEED_UNKNOWN; | |
2053 | vi->duplex = DUPLEX_UNKNOWN; | |
2054 | } | |
2055 | ||
faa9b39f JB |
2056 | static void virtnet_update_settings(struct virtnet_info *vi) |
2057 | { | |
2058 | u32 speed; | |
2059 | u8 duplex; | |
2060 | ||
2061 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) | |
2062 | return; | |
2063 | ||
2064 | speed = virtio_cread32(vi->vdev, offsetof(struct virtio_net_config, | |
2065 | speed)); | |
2066 | if (ethtool_validate_speed(speed)) | |
2067 | vi->speed = speed; | |
2068 | duplex = virtio_cread8(vi->vdev, offsetof(struct virtio_net_config, | |
2069 | duplex)); | |
2070 | if (ethtool_validate_duplex(duplex)) | |
2071 | vi->duplex = duplex; | |
2072 | } | |
2073 | ||
0fc0b732 | 2074 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 2075 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 2076 | .get_link = ethtool_op_get_link, |
8f9f4668 | 2077 | .get_ringparam = virtnet_get_ringparam, |
d7dfc5cf TM |
2078 | .get_strings = virtnet_get_strings, |
2079 | .get_sset_count = virtnet_get_sset_count, | |
2080 | .get_ethtool_stats = virtnet_get_ethtool_stats, | |
d73bcd2c JW |
2081 | .set_channels = virtnet_set_channels, |
2082 | .get_channels = virtnet_get_channels, | |
074c3582 | 2083 | .get_ts_info = ethtool_op_get_ts_info, |
ebb6b4b1 PR |
2084 | .get_link_ksettings = virtnet_get_link_ksettings, |
2085 | .set_link_ksettings = virtnet_set_link_ksettings, | |
a9ea3fc6 HX |
2086 | }; |
2087 | ||
9fe7bfce JF |
2088 | static void virtnet_freeze_down(struct virtio_device *vdev) |
2089 | { | |
2090 | struct virtnet_info *vi = vdev->priv; | |
2091 | int i; | |
2092 | ||
2093 | /* Make sure no work handler is accessing the device */ | |
2094 | flush_work(&vi->config_work); | |
2095 | ||
2096 | netif_device_detach(vi->dev); | |
713a98d9 | 2097 | netif_tx_disable(vi->dev); |
9fe7bfce JF |
2098 | cancel_delayed_work_sync(&vi->refill); |
2099 | ||
2100 | if (netif_running(vi->dev)) { | |
b92f1e67 | 2101 | for (i = 0; i < vi->max_queue_pairs; i++) { |
9fe7bfce | 2102 | napi_disable(&vi->rq[i].napi); |
78a57b48 | 2103 | virtnet_napi_tx_disable(&vi->sq[i].napi); |
b92f1e67 | 2104 | } |
9fe7bfce JF |
2105 | } |
2106 | } | |
2107 | ||
2108 | static int init_vqs(struct virtnet_info *vi); | |
2109 | ||
2110 | static int virtnet_restore_up(struct virtio_device *vdev) | |
2111 | { | |
2112 | struct virtnet_info *vi = vdev->priv; | |
2113 | int err, i; | |
2114 | ||
2115 | err = init_vqs(vi); | |
2116 | if (err) | |
2117 | return err; | |
2118 | ||
2119 | virtio_device_ready(vdev); | |
2120 | ||
2121 | if (netif_running(vi->dev)) { | |
2122 | for (i = 0; i < vi->curr_queue_pairs; i++) | |
2123 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) | |
2124 | schedule_delayed_work(&vi->refill, 0); | |
2125 | ||
b92f1e67 | 2126 | for (i = 0; i < vi->max_queue_pairs; i++) { |
e4e8452a | 2127 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); |
b92f1e67 WB |
2128 | virtnet_napi_tx_enable(vi, vi->sq[i].vq, |
2129 | &vi->sq[i].napi); | |
2130 | } | |
9fe7bfce JF |
2131 | } |
2132 | ||
2133 | netif_device_attach(vi->dev); | |
2134 | return err; | |
2135 | } | |
2136 | ||
3f93522f JW |
2137 | static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) |
2138 | { | |
2139 | struct scatterlist sg; | |
12e57169 | 2140 | vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); |
3f93522f | 2141 | |
12e57169 | 2142 | sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); |
3f93522f JW |
2143 | |
2144 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, | |
2145 | VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { | |
2146 | dev_warn(&vi->dev->dev, "Fail to set guest offload. \n"); | |
2147 | return -EINVAL; | |
2148 | } | |
2149 | ||
2150 | return 0; | |
2151 | } | |
2152 | ||
2153 | static int virtnet_clear_guest_offloads(struct virtnet_info *vi) | |
2154 | { | |
2155 | u64 offloads = 0; | |
2156 | ||
2157 | if (!vi->guest_offloads) | |
2158 | return 0; | |
2159 | ||
2160 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM)) | |
2161 | offloads = 1ULL << VIRTIO_NET_F_GUEST_CSUM; | |
2162 | ||
2163 | return virtnet_set_guest_offloads(vi, offloads); | |
2164 | } | |
2165 | ||
2166 | static int virtnet_restore_guest_offloads(struct virtnet_info *vi) | |
2167 | { | |
2168 | u64 offloads = vi->guest_offloads; | |
2169 | ||
2170 | if (!vi->guest_offloads) | |
2171 | return 0; | |
2172 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM)) | |
2173 | offloads |= 1ULL << VIRTIO_NET_F_GUEST_CSUM; | |
2174 | ||
2175 | return virtnet_set_guest_offloads(vi, offloads); | |
2176 | } | |
2177 | ||
9861ce03 JK |
2178 | static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
2179 | struct netlink_ext_ack *extack) | |
f600b690 JF |
2180 | { |
2181 | unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); | |
2182 | struct virtnet_info *vi = netdev_priv(dev); | |
2183 | struct bpf_prog *old_prog; | |
017b29c3 | 2184 | u16 xdp_qp = 0, curr_qp; |
672aafd5 | 2185 | int i, err; |
f600b690 | 2186 | |
3f93522f JW |
2187 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) |
2188 | && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || | |
2189 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
2190 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || | |
2191 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO))) { | |
4d463c4d | 2192 | NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO, disable LRO first"); |
f600b690 JF |
2193 | return -EOPNOTSUPP; |
2194 | } | |
2195 | ||
2196 | if (vi->mergeable_rx_bufs && !vi->any_header_sg) { | |
4d463c4d | 2197 | NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); |
f600b690 JF |
2198 | return -EINVAL; |
2199 | } | |
2200 | ||
2201 | if (dev->mtu > max_sz) { | |
4d463c4d | 2202 | NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP"); |
f600b690 JF |
2203 | netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); |
2204 | return -EINVAL; | |
2205 | } | |
2206 | ||
672aafd5 JF |
2207 | curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; |
2208 | if (prog) | |
2209 | xdp_qp = nr_cpu_ids; | |
2210 | ||
2211 | /* XDP requires extra queues for XDP_TX */ | |
2212 | if (curr_qp + xdp_qp > vi->max_queue_pairs) { | |
4d463c4d | 2213 | NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available"); |
672aafd5 JF |
2214 | netdev_warn(dev, "request %i queues but max is %i\n", |
2215 | curr_qp + xdp_qp, vi->max_queue_pairs); | |
2216 | return -ENOMEM; | |
2217 | } | |
2218 | ||
2de2f7f4 JF |
2219 | if (prog) { |
2220 | prog = bpf_prog_add(prog, vi->max_queue_pairs - 1); | |
2221 | if (IS_ERR(prog)) | |
2222 | return PTR_ERR(prog); | |
2223 | } | |
2224 | ||
4941d472 | 2225 | /* Make sure NAPI is not using any XDP TX queues for RX. */ |
4e09ff53 JW |
2226 | if (netif_running(dev)) |
2227 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2228 | napi_disable(&vi->rq[i].napi); | |
f600b690 | 2229 | |
672aafd5 | 2230 | netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); |
4941d472 JW |
2231 | err = _virtnet_set_queues(vi, curr_qp + xdp_qp); |
2232 | if (err) | |
2233 | goto err; | |
2234 | vi->xdp_queue_pairs = xdp_qp; | |
672aafd5 | 2235 | |
f600b690 JF |
2236 | for (i = 0; i < vi->max_queue_pairs; i++) { |
2237 | old_prog = rtnl_dereference(vi->rq[i].xdp_prog); | |
2238 | rcu_assign_pointer(vi->rq[i].xdp_prog, prog); | |
3f93522f JW |
2239 | if (i == 0) { |
2240 | if (!old_prog) | |
2241 | virtnet_clear_guest_offloads(vi); | |
2242 | if (!prog) | |
2243 | virtnet_restore_guest_offloads(vi); | |
2244 | } | |
f600b690 JF |
2245 | if (old_prog) |
2246 | bpf_prog_put(old_prog); | |
4e09ff53 JW |
2247 | if (netif_running(dev)) |
2248 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); | |
f600b690 JF |
2249 | } |
2250 | ||
2251 | return 0; | |
2de2f7f4 | 2252 | |
4941d472 JW |
2253 | err: |
2254 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2255 | virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); | |
2de2f7f4 JF |
2256 | if (prog) |
2257 | bpf_prog_sub(prog, vi->max_queue_pairs - 1); | |
2258 | return err; | |
f600b690 JF |
2259 | } |
2260 | ||
5b0e6629 | 2261 | static u32 virtnet_xdp_query(struct net_device *dev) |
f600b690 JF |
2262 | { |
2263 | struct virtnet_info *vi = netdev_priv(dev); | |
5b0e6629 | 2264 | const struct bpf_prog *xdp_prog; |
f600b690 JF |
2265 | int i; |
2266 | ||
2267 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
5b0e6629 MKL |
2268 | xdp_prog = rtnl_dereference(vi->rq[i].xdp_prog); |
2269 | if (xdp_prog) | |
2270 | return xdp_prog->aux->id; | |
f600b690 | 2271 | } |
5b0e6629 | 2272 | return 0; |
f600b690 JF |
2273 | } |
2274 | ||
f4e63525 | 2275 | static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
f600b690 JF |
2276 | { |
2277 | switch (xdp->command) { | |
2278 | case XDP_SETUP_PROG: | |
9861ce03 | 2279 | return virtnet_xdp_set(dev, xdp->prog, xdp->extack); |
f600b690 | 2280 | case XDP_QUERY_PROG: |
5b0e6629 MKL |
2281 | xdp->prog_id = virtnet_xdp_query(dev); |
2282 | xdp->prog_attached = !!xdp->prog_id; | |
f600b690 JF |
2283 | return 0; |
2284 | default: | |
2285 | return -EINVAL; | |
2286 | } | |
2287 | } | |
2288 | ||
76288b4e SH |
2289 | static const struct net_device_ops virtnet_netdev = { |
2290 | .ndo_open = virtnet_open, | |
2291 | .ndo_stop = virtnet_close, | |
2292 | .ndo_start_xmit = start_xmit, | |
2293 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 2294 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 2295 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
3fa2a1df | 2296 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
2297 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
2298 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
2299 | #ifdef CONFIG_NET_POLL_CONTROLLER |
2300 | .ndo_poll_controller = virtnet_netpoll, | |
91815639 | 2301 | #endif |
f4e63525 | 2302 | .ndo_bpf = virtnet_xdp, |
186b3c99 JW |
2303 | .ndo_xdp_xmit = virtnet_xdp_xmit, |
2304 | .ndo_xdp_flush = virtnet_xdp_flush, | |
2836b4f2 | 2305 | .ndo_features_check = passthru_features_check, |
76288b4e SH |
2306 | }; |
2307 | ||
586d17c5 | 2308 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 2309 | { |
586d17c5 JW |
2310 | struct virtnet_info *vi = |
2311 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
2312 | u16 v; |
2313 | ||
855e0c52 RR |
2314 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
2315 | struct virtio_net_config, status, &v) < 0) | |
507613bf | 2316 | return; |
586d17c5 JW |
2317 | |
2318 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 2319 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
2320 | virtnet_ack_link_announce(vi); |
2321 | } | |
9f4d26d0 MM |
2322 | |
2323 | /* Ignore unknown (future) status bits */ | |
2324 | v &= VIRTIO_NET_S_LINK_UP; | |
2325 | ||
2326 | if (vi->status == v) | |
507613bf | 2327 | return; |
9f4d26d0 MM |
2328 | |
2329 | vi->status = v; | |
2330 | ||
2331 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
faa9b39f | 2332 | virtnet_update_settings(vi); |
9f4d26d0 | 2333 | netif_carrier_on(vi->dev); |
986a4f4d | 2334 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
2335 | } else { |
2336 | netif_carrier_off(vi->dev); | |
986a4f4d | 2337 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 MM |
2338 | } |
2339 | } | |
2340 | ||
2341 | static void virtnet_config_changed(struct virtio_device *vdev) | |
2342 | { | |
2343 | struct virtnet_info *vi = vdev->priv; | |
2344 | ||
3b07e9ca | 2345 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
2346 | } |
2347 | ||
986a4f4d JW |
2348 | static void virtnet_free_queues(struct virtnet_info *vi) |
2349 | { | |
d4fb84ee AV |
2350 | int i; |
2351 | ||
ab3971b1 JW |
2352 | for (i = 0; i < vi->max_queue_pairs; i++) { |
2353 | napi_hash_del(&vi->rq[i].napi); | |
d4fb84ee | 2354 | netif_napi_del(&vi->rq[i].napi); |
b92f1e67 | 2355 | netif_napi_del(&vi->sq[i].napi); |
ab3971b1 | 2356 | } |
d4fb84ee | 2357 | |
963abe5c ED |
2358 | /* We called napi_hash_del() before netif_napi_del(), |
2359 | * we need to respect an RCU grace period before freeing vi->rq | |
2360 | */ | |
2361 | synchronize_net(); | |
2362 | ||
986a4f4d JW |
2363 | kfree(vi->rq); |
2364 | kfree(vi->sq); | |
12e57169 | 2365 | kfree(vi->ctrl); |
986a4f4d JW |
2366 | } |
2367 | ||
47315329 | 2368 | static void _free_receive_bufs(struct virtnet_info *vi) |
986a4f4d | 2369 | { |
f600b690 | 2370 | struct bpf_prog *old_prog; |
986a4f4d JW |
2371 | int i; |
2372 | ||
2373 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2374 | while (vi->rq[i].pages) | |
2375 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
f600b690 JF |
2376 | |
2377 | old_prog = rtnl_dereference(vi->rq[i].xdp_prog); | |
2378 | RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); | |
2379 | if (old_prog) | |
2380 | bpf_prog_put(old_prog); | |
986a4f4d | 2381 | } |
47315329 JF |
2382 | } |
2383 | ||
2384 | static void free_receive_bufs(struct virtnet_info *vi) | |
2385 | { | |
2386 | rtnl_lock(); | |
2387 | _free_receive_bufs(vi); | |
f600b690 | 2388 | rtnl_unlock(); |
986a4f4d JW |
2389 | } |
2390 | ||
fb51879d MD |
2391 | static void free_receive_page_frags(struct virtnet_info *vi) |
2392 | { | |
2393 | int i; | |
2394 | for (i = 0; i < vi->max_queue_pairs; i++) | |
2395 | if (vi->rq[i].alloc_frag.page) | |
2396 | put_page(vi->rq[i].alloc_frag.page); | |
2397 | } | |
2398 | ||
b68df015 | 2399 | static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) |
56434a01 JF |
2400 | { |
2401 | if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) | |
2402 | return false; | |
2403 | else if (q < vi->curr_queue_pairs) | |
2404 | return true; | |
2405 | else | |
2406 | return false; | |
2407 | } | |
2408 | ||
986a4f4d JW |
2409 | static void free_unused_bufs(struct virtnet_info *vi) |
2410 | { | |
2411 | void *buf; | |
2412 | int i; | |
2413 | ||
2414 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2415 | struct virtqueue *vq = vi->sq[i].vq; | |
56434a01 | 2416 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { |
b68df015 | 2417 | if (!is_xdp_raw_buffer_queue(vi, i)) |
56434a01 JF |
2418 | dev_kfree_skb(buf); |
2419 | else | |
2420 | put_page(virt_to_head_page(buf)); | |
2421 | } | |
986a4f4d JW |
2422 | } |
2423 | ||
2424 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2425 | struct virtqueue *vq = vi->rq[i].vq; | |
2426 | ||
2427 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
ab7db917 | 2428 | if (vi->mergeable_rx_bufs) { |
680557cf | 2429 | put_page(virt_to_head_page(buf)); |
ab7db917 | 2430 | } else if (vi->big_packets) { |
fa9fac17 | 2431 | give_pages(&vi->rq[i], buf); |
ab7db917 | 2432 | } else { |
f6b10209 | 2433 | put_page(virt_to_head_page(buf)); |
ab7db917 | 2434 | } |
986a4f4d | 2435 | } |
986a4f4d JW |
2436 | } |
2437 | } | |
2438 | ||
e9d7417b JW |
2439 | static void virtnet_del_vqs(struct virtnet_info *vi) |
2440 | { | |
2441 | struct virtio_device *vdev = vi->vdev; | |
2442 | ||
8898c21c | 2443 | virtnet_clean_affinity(vi, -1); |
986a4f4d | 2444 | |
e9d7417b | 2445 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
2446 | |
2447 | virtnet_free_queues(vi); | |
e9d7417b JW |
2448 | } |
2449 | ||
d85b758f MT |
2450 | /* How large should a single buffer be so a queue full of these can fit at |
2451 | * least one full packet? | |
2452 | * Logic below assumes the mergeable buffer header is used. | |
2453 | */ | |
2454 | static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) | |
2455 | { | |
2456 | const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); | |
2457 | unsigned int rq_size = virtqueue_get_vring_size(vq); | |
2458 | unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; | |
2459 | unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; | |
2460 | unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); | |
2461 | ||
f0c3192c MT |
2462 | return max(max(min_buf_len, hdr_len) - hdr_len, |
2463 | (unsigned int)GOOD_PACKET_LEN); | |
d85b758f MT |
2464 | } |
2465 | ||
986a4f4d | 2466 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 2467 | { |
986a4f4d JW |
2468 | vq_callback_t **callbacks; |
2469 | struct virtqueue **vqs; | |
2470 | int ret = -ENOMEM; | |
2471 | int i, total_vqs; | |
2472 | const char **names; | |
d45b897b | 2473 | bool *ctx; |
986a4f4d JW |
2474 | |
2475 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
2476 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
2477 | * possible control vq. | |
2478 | */ | |
2479 | total_vqs = vi->max_queue_pairs * 2 + | |
2480 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
2481 | ||
2482 | /* Allocate space for find_vqs parameters */ | |
2483 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
2484 | if (!vqs) | |
2485 | goto err_vq; | |
2486 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
2487 | if (!callbacks) | |
2488 | goto err_callback; | |
2489 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
2490 | if (!names) | |
2491 | goto err_names; | |
192f68cf | 2492 | if (!vi->big_packets || vi->mergeable_rx_bufs) { |
d45b897b MT |
2493 | ctx = kzalloc(total_vqs * sizeof(*ctx), GFP_KERNEL); |
2494 | if (!ctx) | |
2495 | goto err_ctx; | |
2496 | } else { | |
2497 | ctx = NULL; | |
2498 | } | |
986a4f4d JW |
2499 | |
2500 | /* Parameters for control virtqueue, if any */ | |
2501 | if (vi->has_cvq) { | |
2502 | callbacks[total_vqs - 1] = NULL; | |
2503 | names[total_vqs - 1] = "control"; | |
2504 | } | |
3f9c10b0 | 2505 | |
986a4f4d JW |
2506 | /* Allocate/initialize parameters for send/receive virtqueues */ |
2507 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2508 | callbacks[rxq2vq(i)] = skb_recv_done; | |
2509 | callbacks[txq2vq(i)] = skb_xmit_done; | |
2510 | sprintf(vi->rq[i].name, "input.%d", i); | |
2511 | sprintf(vi->sq[i].name, "output.%d", i); | |
2512 | names[rxq2vq(i)] = vi->rq[i].name; | |
2513 | names[txq2vq(i)] = vi->sq[i].name; | |
d45b897b MT |
2514 | if (ctx) |
2515 | ctx[rxq2vq(i)] = true; | |
986a4f4d | 2516 | } |
3f9c10b0 | 2517 | |
986a4f4d | 2518 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
d45b897b | 2519 | names, ctx, NULL); |
986a4f4d JW |
2520 | if (ret) |
2521 | goto err_find; | |
3f9c10b0 | 2522 | |
986a4f4d JW |
2523 | if (vi->has_cvq) { |
2524 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 2525 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 2526 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 2527 | } |
986a4f4d JW |
2528 | |
2529 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2530 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
d85b758f | 2531 | vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); |
986a4f4d JW |
2532 | vi->sq[i].vq = vqs[txq2vq(i)]; |
2533 | } | |
2534 | ||
2535 | kfree(names); | |
2536 | kfree(callbacks); | |
2537 | kfree(vqs); | |
55281621 | 2538 | kfree(ctx); |
986a4f4d | 2539 | |
3f9c10b0 | 2540 | return 0; |
986a4f4d JW |
2541 | |
2542 | err_find: | |
d45b897b MT |
2543 | kfree(ctx); |
2544 | err_ctx: | |
986a4f4d JW |
2545 | kfree(names); |
2546 | err_names: | |
2547 | kfree(callbacks); | |
2548 | err_callback: | |
2549 | kfree(vqs); | |
2550 | err_vq: | |
2551 | return ret; | |
2552 | } | |
2553 | ||
2554 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
2555 | { | |
2556 | int i; | |
2557 | ||
12e57169 MT |
2558 | vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); |
2559 | if (!vi->ctrl) | |
2560 | goto err_ctrl; | |
986a4f4d JW |
2561 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); |
2562 | if (!vi->sq) | |
2563 | goto err_sq; | |
2564 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 2565 | if (!vi->rq) |
986a4f4d JW |
2566 | goto err_rq; |
2567 | ||
2568 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
2569 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2570 | vi->rq[i].pages = NULL; | |
2571 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
2572 | napi_weight); | |
1d11e732 WB |
2573 | netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx, |
2574 | napi_tx ? napi_weight : 0); | |
986a4f4d JW |
2575 | |
2576 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
5377d758 | 2577 | ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); |
986a4f4d | 2578 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); |
d7dfc5cf TM |
2579 | |
2580 | u64_stats_init(&vi->rq[i].stats.syncp); | |
2581 | u64_stats_init(&vi->sq[i].stats.syncp); | |
986a4f4d JW |
2582 | } |
2583 | ||
2584 | return 0; | |
2585 | ||
2586 | err_rq: | |
2587 | kfree(vi->sq); | |
2588 | err_sq: | |
12e57169 MT |
2589 | kfree(vi->ctrl); |
2590 | err_ctrl: | |
986a4f4d JW |
2591 | return -ENOMEM; |
2592 | } | |
2593 | ||
2594 | static int init_vqs(struct virtnet_info *vi) | |
2595 | { | |
2596 | int ret; | |
2597 | ||
2598 | /* Allocate send & receive queues */ | |
2599 | ret = virtnet_alloc_queues(vi); | |
2600 | if (ret) | |
2601 | goto err; | |
2602 | ||
2603 | ret = virtnet_find_vqs(vi); | |
2604 | if (ret) | |
2605 | goto err_free; | |
2606 | ||
47be2479 | 2607 | get_online_cpus(); |
8898c21c | 2608 | virtnet_set_affinity(vi); |
47be2479 WG |
2609 | put_online_cpus(); |
2610 | ||
986a4f4d JW |
2611 | return 0; |
2612 | ||
2613 | err_free: | |
2614 | virtnet_free_queues(vi); | |
2615 | err: | |
2616 | return ret; | |
3f9c10b0 AS |
2617 | } |
2618 | ||
fbf28d78 MD |
2619 | #ifdef CONFIG_SYSFS |
2620 | static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, | |
718ad681 | 2621 | char *buf) |
fbf28d78 MD |
2622 | { |
2623 | struct virtnet_info *vi = netdev_priv(queue->dev); | |
2624 | unsigned int queue_index = get_netdev_rx_queue_index(queue); | |
3cc81a9a JW |
2625 | unsigned int headroom = virtnet_get_headroom(vi); |
2626 | unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; | |
5377d758 | 2627 | struct ewma_pkt_len *avg; |
fbf28d78 MD |
2628 | |
2629 | BUG_ON(queue_index >= vi->max_queue_pairs); | |
2630 | avg = &vi->rq[queue_index].mrg_avg_pkt_len; | |
d85b758f | 2631 | return sprintf(buf, "%u\n", |
3cc81a9a JW |
2632 | get_mergeable_buf_len(&vi->rq[queue_index], avg, |
2633 | SKB_DATA_ALIGN(headroom + tailroom))); | |
fbf28d78 MD |
2634 | } |
2635 | ||
2636 | static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = | |
2637 | __ATTR_RO(mergeable_rx_buffer_size); | |
2638 | ||
2639 | static struct attribute *virtio_net_mrg_rx_attrs[] = { | |
2640 | &mergeable_rx_buffer_size_attribute.attr, | |
2641 | NULL | |
2642 | }; | |
2643 | ||
2644 | static const struct attribute_group virtio_net_mrg_rx_group = { | |
2645 | .name = "virtio_net", | |
2646 | .attrs = virtio_net_mrg_rx_attrs | |
2647 | }; | |
2648 | #endif | |
2649 | ||
892d6eb1 JW |
2650 | static bool virtnet_fail_on_feature(struct virtio_device *vdev, |
2651 | unsigned int fbit, | |
2652 | const char *fname, const char *dname) | |
2653 | { | |
2654 | if (!virtio_has_feature(vdev, fbit)) | |
2655 | return false; | |
2656 | ||
2657 | dev_err(&vdev->dev, "device advertises feature %s but not %s", | |
2658 | fname, dname); | |
2659 | ||
2660 | return true; | |
2661 | } | |
2662 | ||
2663 | #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ | |
2664 | virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) | |
2665 | ||
2666 | static bool virtnet_validate_features(struct virtio_device *vdev) | |
2667 | { | |
2668 | if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && | |
2669 | (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, | |
2670 | "VIRTIO_NET_F_CTRL_VQ") || | |
2671 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, | |
2672 | "VIRTIO_NET_F_CTRL_VQ") || | |
2673 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, | |
2674 | "VIRTIO_NET_F_CTRL_VQ") || | |
2675 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || | |
2676 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, | |
2677 | "VIRTIO_NET_F_CTRL_VQ"))) { | |
2678 | return false; | |
2679 | } | |
2680 | ||
2681 | return true; | |
2682 | } | |
2683 | ||
d0c2c997 JW |
2684 | #define MIN_MTU ETH_MIN_MTU |
2685 | #define MAX_MTU ETH_MAX_MTU | |
2686 | ||
fe36cbe0 | 2687 | static int virtnet_validate(struct virtio_device *vdev) |
296f96fc | 2688 | { |
6ba42248 MT |
2689 | if (!vdev->config->get) { |
2690 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
2691 | __func__); | |
2692 | return -EINVAL; | |
2693 | } | |
2694 | ||
892d6eb1 JW |
2695 | if (!virtnet_validate_features(vdev)) |
2696 | return -EINVAL; | |
2697 | ||
fe36cbe0 MT |
2698 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
2699 | int mtu = virtio_cread16(vdev, | |
2700 | offsetof(struct virtio_net_config, | |
2701 | mtu)); | |
2702 | if (mtu < MIN_MTU) | |
2703 | __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); | |
2704 | } | |
2705 | ||
2706 | return 0; | |
2707 | } | |
2708 | ||
2709 | static int virtnet_probe(struct virtio_device *vdev) | |
2710 | { | |
d7dfc5cf | 2711 | int i, err = -ENOMEM; |
fe36cbe0 MT |
2712 | struct net_device *dev; |
2713 | struct virtnet_info *vi; | |
2714 | u16 max_queue_pairs; | |
2715 | int mtu; | |
2716 | ||
986a4f4d | 2717 | /* Find if host supports multiqueue virtio_net device */ |
855e0c52 RR |
2718 | err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, |
2719 | struct virtio_net_config, | |
2720 | max_virtqueue_pairs, &max_queue_pairs); | |
986a4f4d JW |
2721 | |
2722 | /* We need at least 2 queue's */ | |
2723 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
2724 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
2725 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
2726 | max_queue_pairs = 1; | |
296f96fc RR |
2727 | |
2728 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 2729 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
2730 | if (!dev) |
2731 | return -ENOMEM; | |
2732 | ||
2733 | /* Set up network device as normal. */ | |
f2f2c8b4 | 2734 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 2735 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 2736 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 2737 | |
7ad24ea4 | 2738 | dev->ethtool_ops = &virtnet_ethtool_ops; |
296f96fc RR |
2739 | SET_NETDEV_DEV(dev, &vdev->dev); |
2740 | ||
2741 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 2742 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 2743 | /* This opens up the world of extra features. */ |
48900cb6 | 2744 | dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 | 2745 | if (csum) |
48900cb6 | 2746 | dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 MM |
2747 | |
2748 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
e078de03 | 2749 | dev->hw_features |= NETIF_F_TSO |
34a48579 RR |
2750 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
2751 | } | |
5539ae96 | 2752 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
2753 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
2754 | dev->hw_features |= NETIF_F_TSO; | |
2755 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
2756 | dev->hw_features |= NETIF_F_TSO6; | |
2757 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
2758 | dev->hw_features |= NETIF_F_TSO_ECN; | |
98e778c9 | 2759 | |
41f2f127 JW |
2760 | dev->features |= NETIF_F_GSO_ROBUST; |
2761 | ||
98e778c9 | 2762 | if (gso) |
e078de03 | 2763 | dev->features |= dev->hw_features & NETIF_F_ALL_TSO; |
98e778c9 | 2764 | /* (!csum && gso) case will be fixed by register_netdev() */ |
296f96fc | 2765 | } |
4f49129b TH |
2766 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
2767 | dev->features |= NETIF_F_RXCSUM; | |
296f96fc | 2768 | |
4fda8302 JW |
2769 | dev->vlan_features = dev->features; |
2770 | ||
d0c2c997 JW |
2771 | /* MTU range: 68 - 65535 */ |
2772 | dev->min_mtu = MIN_MTU; | |
2773 | dev->max_mtu = MAX_MTU; | |
2774 | ||
296f96fc | 2775 | /* Configuration may specify what MAC to use. Otherwise random. */ |
855e0c52 RR |
2776 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
2777 | virtio_cread_bytes(vdev, | |
2778 | offsetof(struct virtio_net_config, mac), | |
2779 | dev->dev_addr, dev->addr_len); | |
2780 | else | |
f2cedb63 | 2781 | eth_hw_addr_random(dev); |
296f96fc RR |
2782 | |
2783 | /* Set up our device-specific information */ | |
2784 | vi = netdev_priv(dev); | |
296f96fc RR |
2785 | vi->dev = dev; |
2786 | vi->vdev = vdev; | |
d9d5dcc8 | 2787 | vdev->priv = vi; |
827da44c | 2788 | |
586d17c5 | 2789 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); |
296f96fc | 2790 | |
97402b96 | 2791 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
2792 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
2793 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
e3e3c423 VY |
2794 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
2795 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) | |
97402b96 HX |
2796 | vi->big_packets = true; |
2797 | ||
3f2c31d9 MM |
2798 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
2799 | vi->mergeable_rx_bufs = true; | |
2800 | ||
d04302b3 MT |
2801 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || |
2802 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
012873d0 MT |
2803 | vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
2804 | else | |
2805 | vi->hdr_len = sizeof(struct virtio_net_hdr); | |
2806 | ||
75993300 MT |
2807 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || |
2808 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
e7428e95 MT |
2809 | vi->any_header_sg = true; |
2810 | ||
986a4f4d JW |
2811 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
2812 | vi->has_cvq = true; | |
2813 | ||
14de9d11 AC |
2814 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
2815 | mtu = virtio_cread16(vdev, | |
2816 | offsetof(struct virtio_net_config, | |
2817 | mtu)); | |
93a205ee | 2818 | if (mtu < dev->min_mtu) { |
fe36cbe0 MT |
2819 | /* Should never trigger: MTU was previously validated |
2820 | * in virtnet_validate. | |
2821 | */ | |
2822 | dev_err(&vdev->dev, "device MTU appears to have changed " | |
2823 | "it is now %d < %d", mtu, dev->min_mtu); | |
d7dfc5cf | 2824 | goto free; |
93a205ee | 2825 | } |
2e123b44 | 2826 | |
fe36cbe0 MT |
2827 | dev->mtu = mtu; |
2828 | dev->max_mtu = mtu; | |
2829 | ||
2e123b44 MT |
2830 | /* TODO: size buffers correctly in this case. */ |
2831 | if (dev->mtu > ETH_DATA_LEN) | |
2832 | vi->big_packets = true; | |
14de9d11 AC |
2833 | } |
2834 | ||
012873d0 MT |
2835 | if (vi->any_header_sg) |
2836 | dev->needed_headroom = vi->hdr_len; | |
6ebbc1a6 | 2837 | |
44900010 JW |
2838 | /* Enable multiqueue by default */ |
2839 | if (num_online_cpus() >= max_queue_pairs) | |
2840 | vi->curr_queue_pairs = max_queue_pairs; | |
2841 | else | |
2842 | vi->curr_queue_pairs = num_online_cpus(); | |
986a4f4d JW |
2843 | vi->max_queue_pairs = max_queue_pairs; |
2844 | ||
2845 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 2846 | err = init_vqs(vi); |
d2a7ddda | 2847 | if (err) |
d7dfc5cf | 2848 | goto free; |
296f96fc | 2849 | |
fbf28d78 MD |
2850 | #ifdef CONFIG_SYSFS |
2851 | if (vi->mergeable_rx_bufs) | |
2852 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; | |
2853 | #endif | |
0f13b66b ZYW |
2854 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
2855 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); | |
986a4f4d | 2856 | |
16032be5 NA |
2857 | virtnet_init_settings(dev); |
2858 | ||
296f96fc RR |
2859 | err = register_netdev(dev); |
2860 | if (err) { | |
2861 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 2862 | goto free_vqs; |
296f96fc | 2863 | } |
b3369c1f | 2864 | |
4baf1e33 MT |
2865 | virtio_device_ready(vdev); |
2866 | ||
8017c279 | 2867 | err = virtnet_cpu_notif_add(vi); |
8de4b2f3 WG |
2868 | if (err) { |
2869 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
f00e35e2 | 2870 | goto free_unregister_netdev; |
8de4b2f3 WG |
2871 | } |
2872 | ||
a220871b | 2873 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
44900010 | 2874 | |
167c25e4 JW |
2875 | /* Assume link up if device can't report link status, |
2876 | otherwise get link status from config. */ | |
bda7fab5 | 2877 | netif_carrier_off(dev); |
167c25e4 | 2878 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { |
3b07e9ca | 2879 | schedule_work(&vi->config_work); |
167c25e4 JW |
2880 | } else { |
2881 | vi->status = VIRTIO_NET_S_LINK_UP; | |
faa9b39f | 2882 | virtnet_update_settings(vi); |
167c25e4 JW |
2883 | netif_carrier_on(dev); |
2884 | } | |
9f4d26d0 | 2885 | |
3f93522f JW |
2886 | for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) |
2887 | if (virtio_has_feature(vi->vdev, guest_offloads[i])) | |
2888 | set_bit(guest_offloads[i], &vi->guest_offloads); | |
2889 | ||
986a4f4d JW |
2890 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
2891 | dev->name, max_queue_pairs); | |
2892 | ||
296f96fc RR |
2893 | return 0; |
2894 | ||
f00e35e2 | 2895 | free_unregister_netdev: |
02465555 MT |
2896 | vi->vdev->config->reset(vdev); |
2897 | ||
b3369c1f | 2898 | unregister_netdev(dev); |
d2a7ddda | 2899 | free_vqs: |
986a4f4d | 2900 | cancel_delayed_work_sync(&vi->refill); |
fb51879d | 2901 | free_receive_page_frags(vi); |
e9d7417b | 2902 | virtnet_del_vqs(vi); |
296f96fc RR |
2903 | free: |
2904 | free_netdev(dev); | |
2905 | return err; | |
2906 | } | |
2907 | ||
04486ed0 | 2908 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 2909 | { |
04486ed0 | 2910 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
2911 | |
2912 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 2913 | free_unused_bufs(vi); |
fb6813f4 | 2914 | |
986a4f4d | 2915 | free_receive_bufs(vi); |
d2a7ddda | 2916 | |
fb51879d MD |
2917 | free_receive_page_frags(vi); |
2918 | ||
986a4f4d | 2919 | virtnet_del_vqs(vi); |
04486ed0 AS |
2920 | } |
2921 | ||
8cc085d6 | 2922 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
2923 | { |
2924 | struct virtnet_info *vi = vdev->priv; | |
2925 | ||
8017c279 | 2926 | virtnet_cpu_notif_remove(vi); |
8de4b2f3 | 2927 | |
102a2786 MT |
2928 | /* Make sure no work handler is accessing the device. */ |
2929 | flush_work(&vi->config_work); | |
586d17c5 | 2930 | |
04486ed0 AS |
2931 | unregister_netdev(vi->dev); |
2932 | ||
2933 | remove_vq_common(vi); | |
fb6813f4 | 2934 | |
74b2553f | 2935 | free_netdev(vi->dev); |
296f96fc RR |
2936 | } |
2937 | ||
67a75194 | 2938 | static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) |
0741bcb5 AS |
2939 | { |
2940 | struct virtnet_info *vi = vdev->priv; | |
2941 | ||
8017c279 | 2942 | virtnet_cpu_notif_remove(vi); |
9fe7bfce | 2943 | virtnet_freeze_down(vdev); |
0741bcb5 AS |
2944 | remove_vq_common(vi); |
2945 | ||
2946 | return 0; | |
2947 | } | |
2948 | ||
67a75194 | 2949 | static __maybe_unused int virtnet_restore(struct virtio_device *vdev) |
0741bcb5 AS |
2950 | { |
2951 | struct virtnet_info *vi = vdev->priv; | |
9fe7bfce | 2952 | int err; |
0741bcb5 | 2953 | |
9fe7bfce | 2954 | err = virtnet_restore_up(vdev); |
0741bcb5 AS |
2955 | if (err) |
2956 | return err; | |
986a4f4d JW |
2957 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
2958 | ||
8017c279 | 2959 | err = virtnet_cpu_notif_add(vi); |
ec9debbd JW |
2960 | if (err) |
2961 | return err; | |
2962 | ||
0741bcb5 AS |
2963 | return 0; |
2964 | } | |
0741bcb5 | 2965 | |
296f96fc RR |
2966 | static struct virtio_device_id id_table[] = { |
2967 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
2968 | { 0 }, | |
2969 | }; | |
2970 | ||
f3358507 MT |
2971 | #define VIRTNET_FEATURES \ |
2972 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ | |
2973 | VIRTIO_NET_F_MAC, \ | |
2974 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ | |
2975 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ | |
2976 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ | |
2977 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ | |
2978 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ | |
2979 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ | |
2980 | VIRTIO_NET_F_CTRL_MAC_ADDR, \ | |
faa9b39f JB |
2981 | VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ |
2982 | VIRTIO_NET_F_SPEED_DUPLEX | |
f3358507 | 2983 | |
c45a6816 | 2984 | static unsigned int features[] = { |
f3358507 MT |
2985 | VIRTNET_FEATURES, |
2986 | }; | |
2987 | ||
2988 | static unsigned int features_legacy[] = { | |
2989 | VIRTNET_FEATURES, | |
2990 | VIRTIO_NET_F_GSO, | |
e7428e95 | 2991 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
2992 | }; |
2993 | ||
22402529 | 2994 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
2995 | .feature_table = features, |
2996 | .feature_table_size = ARRAY_SIZE(features), | |
f3358507 MT |
2997 | .feature_table_legacy = features_legacy, |
2998 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), | |
296f96fc RR |
2999 | .driver.name = KBUILD_MODNAME, |
3000 | .driver.owner = THIS_MODULE, | |
3001 | .id_table = id_table, | |
fe36cbe0 | 3002 | .validate = virtnet_validate, |
296f96fc | 3003 | .probe = virtnet_probe, |
8cc085d6 | 3004 | .remove = virtnet_remove, |
9f4d26d0 | 3005 | .config_changed = virtnet_config_changed, |
89107000 | 3006 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
3007 | .freeze = virtnet_freeze, |
3008 | .restore = virtnet_restore, | |
3009 | #endif | |
296f96fc RR |
3010 | }; |
3011 | ||
8017c279 SAS |
3012 | static __init int virtio_net_driver_init(void) |
3013 | { | |
3014 | int ret; | |
3015 | ||
73c1b41e | 3016 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", |
8017c279 SAS |
3017 | virtnet_cpu_online, |
3018 | virtnet_cpu_down_prep); | |
3019 | if (ret < 0) | |
3020 | goto out; | |
3021 | virtionet_online = ret; | |
73c1b41e | 3022 | ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", |
8017c279 SAS |
3023 | NULL, virtnet_cpu_dead); |
3024 | if (ret) | |
3025 | goto err_dead; | |
3026 | ||
3027 | ret = register_virtio_driver(&virtio_net_driver); | |
3028 | if (ret) | |
3029 | goto err_virtio; | |
3030 | return 0; | |
3031 | err_virtio: | |
3032 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); | |
3033 | err_dead: | |
3034 | cpuhp_remove_multi_state(virtionet_online); | |
3035 | out: | |
3036 | return ret; | |
3037 | } | |
3038 | module_init(virtio_net_driver_init); | |
3039 | ||
3040 | static __exit void virtio_net_driver_exit(void) | |
3041 | { | |
cfa0ebc9 | 3042 | unregister_virtio_driver(&virtio_net_driver); |
8017c279 SAS |
3043 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); |
3044 | cpuhp_remove_multi_state(virtionet_online); | |
8017c279 SAS |
3045 | } |
3046 | module_exit(virtio_net_driver_exit); | |
296f96fc RR |
3047 | |
3048 | MODULE_DEVICE_TABLE(virtio, id_table); | |
3049 | MODULE_DESCRIPTION("Virtio network driver"); | |
3050 | MODULE_LICENSE("GPL"); |