Commit | Line | Data |
---|---|---|
48925e37 | 1 | /* A network driver using virtio. |
296f96fc RR |
2 | * |
3 | * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
adf8d3ff | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
296f96fc RR |
17 | */ |
18 | //#define DEBUG | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/etherdevice.h> | |
a9ea3fc6 | 21 | #include <linux/ethtool.h> |
296f96fc RR |
22 | #include <linux/module.h> |
23 | #include <linux/virtio.h> | |
24 | #include <linux/virtio_net.h> | |
f600b690 | 25 | #include <linux/bpf.h> |
a67edbf4 | 26 | #include <linux/bpf_trace.h> |
296f96fc | 27 | #include <linux/scatterlist.h> |
e918085a | 28 | #include <linux/if_vlan.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
8de4b2f3 | 30 | #include <linux/cpu.h> |
ab7db917 | 31 | #include <linux/average.h> |
296f96fc | 32 | |
d34710e3 | 33 | static int napi_weight = NAPI_POLL_WEIGHT; |
6c0cd7c0 DL |
34 | module_param(napi_weight, int, 0444); |
35 | ||
eb939922 | 36 | static bool csum = true, gso = true; |
34a48579 RR |
37 | module_param(csum, bool, 0444); |
38 | module_param(gso, bool, 0444); | |
39 | ||
296f96fc | 40 | /* FIXME: MTU in config. */ |
5061de36 | 41 | #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) |
3f2c31d9 | 42 | #define GOOD_COPY_LEN 128 |
296f96fc | 43 | |
f6b10209 JW |
44 | #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
45 | ||
2de2f7f4 JF |
46 | /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */ |
47 | #define VIRTIO_XDP_HEADROOM 256 | |
48 | ||
5377d758 JB |
49 | /* RX packet size EWMA. The average packet size is used to determine the packet |
50 | * buffer size when refilling RX rings. As the entire RX ring may be refilled | |
51 | * at once, the weight is chosen so that the EWMA will be insensitive to short- | |
52 | * term, transient changes in packet size. | |
ab7db917 | 53 | */ |
5377d758 | 54 | DECLARE_EWMA(pkt_len, 1, 64) |
ab7db917 | 55 | |
d0fa28f0 MT |
56 | /* With mergeable buffers we align buffer address and use the low bits to |
57 | * encode its true size. Buffer size is up to 1 page so we need to align to | |
58 | * square root of page size to ensure we reserve enough bits to encode the true | |
59 | * size. | |
60 | */ | |
61 | #define MERGEABLE_BUFFER_MIN_ALIGN_SHIFT ((PAGE_SHIFT + 1) / 2) | |
62 | ||
ab7db917 | 63 | /* Minimum alignment for mergeable packet buffers. */ |
d0fa28f0 MT |
64 | #define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, \ |
65 | 1 << MERGEABLE_BUFFER_MIN_ALIGN_SHIFT) | |
ab7db917 | 66 | |
66846048 | 67 | #define VIRTNET_DRIVER_VERSION "1.0.0" |
2a41f71d | 68 | |
3fa2a1df | 69 | struct virtnet_stats { |
83a27052 ED |
70 | struct u64_stats_sync tx_syncp; |
71 | struct u64_stats_sync rx_syncp; | |
3fa2a1df | 72 | u64 tx_bytes; |
73 | u64 tx_packets; | |
74 | ||
75 | u64 rx_bytes; | |
76 | u64 rx_packets; | |
77 | }; | |
78 | ||
e9d7417b JW |
79 | /* Internal representation of a send virtqueue */ |
80 | struct send_queue { | |
81 | /* Virtqueue associated with this send _queue */ | |
82 | struct virtqueue *vq; | |
83 | ||
84 | /* TX: fragments + linear part + virtio header */ | |
85 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
86 | |
87 | /* Name of the send queue: output.$index */ | |
88 | char name[40]; | |
e9d7417b JW |
89 | }; |
90 | ||
91 | /* Internal representation of a receive virtqueue */ | |
92 | struct receive_queue { | |
93 | /* Virtqueue associated with this receive_queue */ | |
94 | struct virtqueue *vq; | |
95 | ||
296f96fc RR |
96 | struct napi_struct napi; |
97 | ||
f600b690 JF |
98 | struct bpf_prog __rcu *xdp_prog; |
99 | ||
e9d7417b JW |
100 | /* Chain pages by the private ptr. */ |
101 | struct page *pages; | |
102 | ||
ab7db917 | 103 | /* Average packet length for mergeable receive buffers. */ |
5377d758 | 104 | struct ewma_pkt_len mrg_avg_pkt_len; |
ab7db917 | 105 | |
fb51879d MD |
106 | /* Page frag for packet buffer allocation. */ |
107 | struct page_frag alloc_frag; | |
108 | ||
e9d7417b JW |
109 | /* RX: fragments + linear part + virtio header */ |
110 | struct scatterlist sg[MAX_SKB_FRAGS + 2]; | |
986a4f4d JW |
111 | |
112 | /* Name of this receive queue: input.$index */ | |
113 | char name[40]; | |
e9d7417b JW |
114 | }; |
115 | ||
116 | struct virtnet_info { | |
117 | struct virtio_device *vdev; | |
118 | struct virtqueue *cvq; | |
119 | struct net_device *dev; | |
986a4f4d JW |
120 | struct send_queue *sq; |
121 | struct receive_queue *rq; | |
e9d7417b JW |
122 | unsigned int status; |
123 | ||
986a4f4d JW |
124 | /* Max # of queue pairs supported by the device */ |
125 | u16 max_queue_pairs; | |
126 | ||
127 | /* # of queue pairs currently used by the driver */ | |
128 | u16 curr_queue_pairs; | |
129 | ||
672aafd5 JF |
130 | /* # of XDP queue pairs currently used by the driver */ |
131 | u16 xdp_queue_pairs; | |
132 | ||
97402b96 HX |
133 | /* I like... big packets and I cannot lie! */ |
134 | bool big_packets; | |
135 | ||
3f2c31d9 MM |
136 | /* Host will merge rx buffers for big packets (shake it! shake it!) */ |
137 | bool mergeable_rx_bufs; | |
138 | ||
986a4f4d JW |
139 | /* Has control virtqueue */ |
140 | bool has_cvq; | |
141 | ||
e7428e95 MT |
142 | /* Host can handle any s/g split between our header and packet data */ |
143 | bool any_header_sg; | |
144 | ||
012873d0 MT |
145 | /* Packet virtio header size */ |
146 | u8 hdr_len; | |
147 | ||
3fa2a1df | 148 | /* Active statistics */ |
149 | struct virtnet_stats __percpu *stats; | |
150 | ||
3161e453 RR |
151 | /* Work struct for refilling if we run low on memory. */ |
152 | struct delayed_work refill; | |
153 | ||
586d17c5 JW |
154 | /* Work struct for config space updates */ |
155 | struct work_struct config_work; | |
156 | ||
986a4f4d JW |
157 | /* Does the affinity hint is set for virtqueues? */ |
158 | bool affinity_hint_set; | |
47be2479 | 159 | |
8017c279 SAS |
160 | /* CPU hotplug instances for online & dead */ |
161 | struct hlist_node node; | |
162 | struct hlist_node node_dead; | |
2ac46030 MT |
163 | |
164 | /* Control VQ buffers: protected by the rtnl lock */ | |
165 | struct virtio_net_ctrl_hdr ctrl_hdr; | |
166 | virtio_net_ctrl_ack ctrl_status; | |
a725ee3e | 167 | struct virtio_net_ctrl_mq ctrl_mq; |
2ac46030 MT |
168 | u8 ctrl_promisc; |
169 | u8 ctrl_allmulti; | |
a725ee3e | 170 | u16 ctrl_vid; |
16032be5 NA |
171 | |
172 | /* Ethtool settings */ | |
173 | u8 duplex; | |
174 | u32 speed; | |
296f96fc RR |
175 | }; |
176 | ||
9ab86bbc | 177 | struct padded_vnet_hdr { |
012873d0 | 178 | struct virtio_net_hdr_mrg_rxbuf hdr; |
9ab86bbc | 179 | /* |
012873d0 MT |
180 | * hdr is in a separate sg buffer, and data sg buffer shares same page |
181 | * with this header sg. This padding makes next sg 16 byte aligned | |
182 | * after the header. | |
9ab86bbc | 183 | */ |
012873d0 | 184 | char padding[4]; |
9ab86bbc SM |
185 | }; |
186 | ||
986a4f4d JW |
187 | /* Converting between virtqueue no. and kernel tx/rx queue no. |
188 | * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq | |
189 | */ | |
190 | static int vq2txq(struct virtqueue *vq) | |
191 | { | |
9d0ca6ed | 192 | return (vq->index - 1) / 2; |
986a4f4d JW |
193 | } |
194 | ||
195 | static int txq2vq(int txq) | |
196 | { | |
197 | return txq * 2 + 1; | |
198 | } | |
199 | ||
200 | static int vq2rxq(struct virtqueue *vq) | |
201 | { | |
9d0ca6ed | 202 | return vq->index / 2; |
986a4f4d JW |
203 | } |
204 | ||
205 | static int rxq2vq(int rxq) | |
206 | { | |
207 | return rxq * 2; | |
208 | } | |
209 | ||
012873d0 | 210 | static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) |
296f96fc | 211 | { |
012873d0 | 212 | return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; |
296f96fc RR |
213 | } |
214 | ||
9ab86bbc SM |
215 | /* |
216 | * private is used to chain pages for big packets, put the whole | |
217 | * most recent used list in the beginning for reuse | |
218 | */ | |
e9d7417b | 219 | static void give_pages(struct receive_queue *rq, struct page *page) |
0a888fd1 | 220 | { |
9ab86bbc | 221 | struct page *end; |
0a888fd1 | 222 | |
e9d7417b | 223 | /* Find end of list, sew whole thing into vi->rq.pages. */ |
9ab86bbc | 224 | for (end = page; end->private; end = (struct page *)end->private); |
e9d7417b JW |
225 | end->private = (unsigned long)rq->pages; |
226 | rq->pages = page; | |
0a888fd1 MM |
227 | } |
228 | ||
e9d7417b | 229 | static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) |
fb6813f4 | 230 | { |
e9d7417b | 231 | struct page *p = rq->pages; |
fb6813f4 | 232 | |
9ab86bbc | 233 | if (p) { |
e9d7417b | 234 | rq->pages = (struct page *)p->private; |
9ab86bbc SM |
235 | /* clear private here, it is used to chain pages */ |
236 | p->private = 0; | |
237 | } else | |
fb6813f4 RR |
238 | p = alloc_page(gfp_mask); |
239 | return p; | |
240 | } | |
241 | ||
e9d7417b | 242 | static void skb_xmit_done(struct virtqueue *vq) |
296f96fc | 243 | { |
e9d7417b | 244 | struct virtnet_info *vi = vq->vdev->priv; |
296f96fc | 245 | |
2cb9c6ba | 246 | /* Suppress further interrupts. */ |
e9d7417b | 247 | virtqueue_disable_cb(vq); |
11a3a154 | 248 | |
363f1514 | 249 | /* We were probably waiting for more output buffers. */ |
986a4f4d | 250 | netif_wake_subqueue(vi->dev, vq2txq(vq)); |
296f96fc RR |
251 | } |
252 | ||
ab7db917 MD |
253 | static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) |
254 | { | |
255 | unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); | |
256 | return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; | |
257 | } | |
258 | ||
259 | static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) | |
260 | { | |
261 | return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); | |
262 | ||
263 | } | |
264 | ||
265 | static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) | |
266 | { | |
267 | unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; | |
268 | return (unsigned long)buf | (size - 1); | |
269 | } | |
270 | ||
3464645a | 271 | /* Called from bottom half context */ |
946fa564 MT |
272 | static struct sk_buff *page_to_skb(struct virtnet_info *vi, |
273 | struct receive_queue *rq, | |
2613af0e MD |
274 | struct page *page, unsigned int offset, |
275 | unsigned int len, unsigned int truesize) | |
9ab86bbc SM |
276 | { |
277 | struct sk_buff *skb; | |
012873d0 | 278 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
2613af0e | 279 | unsigned int copy, hdr_len, hdr_padded_len; |
9ab86bbc | 280 | char *p; |
fb6813f4 | 281 | |
2613af0e | 282 | p = page_address(page) + offset; |
3f2c31d9 | 283 | |
9ab86bbc | 284 | /* copy small packet so we can reuse these pages for small data */ |
c67f5db8 | 285 | skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); |
9ab86bbc SM |
286 | if (unlikely(!skb)) |
287 | return NULL; | |
3f2c31d9 | 288 | |
9ab86bbc | 289 | hdr = skb_vnet_hdr(skb); |
3f2c31d9 | 290 | |
012873d0 MT |
291 | hdr_len = vi->hdr_len; |
292 | if (vi->mergeable_rx_bufs) | |
293 | hdr_padded_len = sizeof *hdr; | |
294 | else | |
2613af0e | 295 | hdr_padded_len = sizeof(struct padded_vnet_hdr); |
3f2c31d9 | 296 | |
9ab86bbc | 297 | memcpy(hdr, p, hdr_len); |
3f2c31d9 | 298 | |
9ab86bbc | 299 | len -= hdr_len; |
2613af0e MD |
300 | offset += hdr_padded_len; |
301 | p += hdr_padded_len; | |
3f2c31d9 | 302 | |
9ab86bbc SM |
303 | copy = len; |
304 | if (copy > skb_tailroom(skb)) | |
305 | copy = skb_tailroom(skb); | |
306 | memcpy(skb_put(skb, copy), p, copy); | |
3f2c31d9 | 307 | |
9ab86bbc SM |
308 | len -= copy; |
309 | offset += copy; | |
3f2c31d9 | 310 | |
2613af0e MD |
311 | if (vi->mergeable_rx_bufs) { |
312 | if (len) | |
313 | skb_add_rx_frag(skb, 0, page, offset, len, truesize); | |
314 | else | |
315 | put_page(page); | |
316 | return skb; | |
317 | } | |
318 | ||
e878d78b SL |
319 | /* |
320 | * Verify that we can indeed put this data into a skb. | |
321 | * This is here to handle cases when the device erroneously | |
322 | * tries to receive more than is possible. This is usually | |
323 | * the case of a broken device. | |
324 | */ | |
325 | if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { | |
be443899 | 326 | net_dbg_ratelimited("%s: too much data\n", skb->dev->name); |
e878d78b SL |
327 | dev_kfree_skb(skb); |
328 | return NULL; | |
329 | } | |
2613af0e | 330 | BUG_ON(offset >= PAGE_SIZE); |
9ab86bbc | 331 | while (len) { |
2613af0e MD |
332 | unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); |
333 | skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, | |
334 | frag_size, truesize); | |
335 | len -= frag_size; | |
9ab86bbc SM |
336 | page = (struct page *)page->private; |
337 | offset = 0; | |
338 | } | |
3f2c31d9 | 339 | |
9ab86bbc | 340 | if (page) |
e9d7417b | 341 | give_pages(rq, page); |
3f2c31d9 | 342 | |
9ab86bbc SM |
343 | return skb; |
344 | } | |
3f2c31d9 | 345 | |
a67edbf4 | 346 | static bool virtnet_xdp_xmit(struct virtnet_info *vi, |
56434a01 | 347 | struct receive_queue *rq, |
f6b10209 | 348 | struct xdp_buff *xdp) |
56434a01 | 349 | { |
56434a01 | 350 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
f6b10209 | 351 | unsigned int len; |
722d8283 JF |
352 | struct send_queue *sq; |
353 | unsigned int qp; | |
56434a01 JF |
354 | void *xdp_sent; |
355 | int err; | |
356 | ||
722d8283 JF |
357 | qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); |
358 | sq = &vi->sq[qp]; | |
359 | ||
56434a01 JF |
360 | /* Free up any pending old buffers before queueing new ones. */ |
361 | while ((xdp_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) { | |
f6b10209 | 362 | struct page *sent_page = virt_to_head_page(xdp_sent); |
bb91accf | 363 | |
f6b10209 | 364 | put_page(sent_page); |
bb91accf | 365 | } |
56434a01 | 366 | |
f6b10209 JW |
367 | xdp->data -= vi->hdr_len; |
368 | /* Zero header and leave csum up to XDP layers */ | |
369 | hdr = xdp->data; | |
370 | memset(hdr, 0, vi->hdr_len); | |
bb91accf | 371 | |
f6b10209 | 372 | sg_init_one(sq->sg, xdp->data, xdp->data_end - xdp->data); |
bb91accf | 373 | |
f6b10209 | 374 | err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp->data, GFP_ATOMIC); |
56434a01 | 375 | if (unlikely(err)) { |
f6b10209 | 376 | struct page *page = virt_to_head_page(xdp->data); |
bb91accf | 377 | |
f6b10209 | 378 | put_page(page); |
a67edbf4 | 379 | return false; |
56434a01 JF |
380 | } |
381 | ||
382 | virtqueue_kick(sq->vq); | |
a67edbf4 | 383 | return true; |
56434a01 JF |
384 | } |
385 | ||
f6b10209 JW |
386 | static unsigned int virtnet_get_headroom(struct virtnet_info *vi) |
387 | { | |
388 | return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0; | |
389 | } | |
390 | ||
bb91accf JW |
391 | static struct sk_buff *receive_small(struct net_device *dev, |
392 | struct virtnet_info *vi, | |
393 | struct receive_queue *rq, | |
394 | void *buf, unsigned int len) | |
f121159d | 395 | { |
f6b10209 | 396 | struct sk_buff *skb; |
bb91accf | 397 | struct bpf_prog *xdp_prog; |
f6b10209 JW |
398 | unsigned int xdp_headroom = virtnet_get_headroom(vi); |
399 | unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; | |
400 | unsigned int headroom = vi->hdr_len + header_offset; | |
401 | unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + | |
402 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
403 | unsigned int delta = 0; | |
012873d0 | 404 | len -= vi->hdr_len; |
f121159d | 405 | |
bb91accf JW |
406 | rcu_read_lock(); |
407 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
408 | if (xdp_prog) { | |
f6b10209 | 409 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; |
0354e4d1 | 410 | struct xdp_buff xdp; |
f6b10209 | 411 | void *orig_data; |
bb91accf JW |
412 | u32 act; |
413 | ||
414 | if (unlikely(hdr->hdr.gso_type || hdr->hdr.flags)) | |
415 | goto err_xdp; | |
0354e4d1 | 416 | |
f6b10209 JW |
417 | xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len; |
418 | xdp.data = xdp.data_hard_start + xdp_headroom; | |
0354e4d1 | 419 | xdp.data_end = xdp.data + len; |
f6b10209 | 420 | orig_data = xdp.data; |
0354e4d1 JF |
421 | act = bpf_prog_run_xdp(xdp_prog, &xdp); |
422 | ||
bb91accf JW |
423 | switch (act) { |
424 | case XDP_PASS: | |
2de2f7f4 | 425 | /* Recalculate length in case bpf program changed it */ |
f6b10209 | 426 | delta = orig_data - xdp.data; |
bb91accf JW |
427 | break; |
428 | case XDP_TX: | |
f6b10209 | 429 | if (unlikely(!virtnet_xdp_xmit(vi, rq, &xdp))) |
0354e4d1 | 430 | trace_xdp_exception(vi->dev, xdp_prog, act); |
bb91accf JW |
431 | rcu_read_unlock(); |
432 | goto xdp_xmit; | |
bb91accf | 433 | default: |
0354e4d1 JF |
434 | bpf_warn_invalid_xdp_action(act); |
435 | case XDP_ABORTED: | |
436 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
437 | case XDP_DROP: | |
bb91accf JW |
438 | goto err_xdp; |
439 | } | |
440 | } | |
441 | rcu_read_unlock(); | |
442 | ||
f6b10209 JW |
443 | skb = build_skb(buf, buflen); |
444 | if (!skb) { | |
445 | put_page(virt_to_head_page(buf)); | |
446 | goto err; | |
447 | } | |
448 | skb_reserve(skb, headroom - delta); | |
449 | skb_put(skb, len + delta); | |
450 | if (!delta) { | |
451 | buf += header_offset; | |
452 | memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); | |
453 | } /* keep zeroed vnet hdr since packet was changed by bpf */ | |
454 | ||
455 | err: | |
f121159d | 456 | return skb; |
bb91accf JW |
457 | |
458 | err_xdp: | |
459 | rcu_read_unlock(); | |
460 | dev->stats.rx_dropped++; | |
f6b10209 | 461 | put_page(virt_to_head_page(buf)); |
bb91accf JW |
462 | xdp_xmit: |
463 | return NULL; | |
f121159d MT |
464 | } |
465 | ||
466 | static struct sk_buff *receive_big(struct net_device *dev, | |
946fa564 | 467 | struct virtnet_info *vi, |
f121159d MT |
468 | struct receive_queue *rq, |
469 | void *buf, | |
470 | unsigned int len) | |
471 | { | |
472 | struct page *page = buf; | |
c47a43d3 | 473 | struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE); |
f600b690 | 474 | |
f121159d MT |
475 | if (unlikely(!skb)) |
476 | goto err; | |
477 | ||
478 | return skb; | |
479 | ||
480 | err: | |
481 | dev->stats.rx_dropped++; | |
482 | give_pages(rq, page); | |
483 | return NULL; | |
484 | } | |
485 | ||
72979a6c JF |
486 | /* The conditions to enable XDP should preclude the underlying device from |
487 | * sending packets across multiple buffers (num_buf > 1). However per spec | |
488 | * it does not appear to be illegal to do so but rather just against convention. | |
489 | * So in order to avoid making a system unresponsive the packets are pushed | |
490 | * into a page and the XDP program is run. This will be extremely slow and we | |
491 | * push a warning to the user to fix this as soon as possible. Fixing this may | |
492 | * require resolving the underlying hardware to determine why multiple buffers | |
493 | * are being received or simply loading the XDP program in the ingress stack | |
494 | * after the skb is built because there is no advantage to running it here | |
495 | * anymore. | |
496 | */ | |
497 | static struct page *xdp_linearize_page(struct receive_queue *rq, | |
56a86f84 | 498 | u16 *num_buf, |
72979a6c JF |
499 | struct page *p, |
500 | int offset, | |
501 | unsigned int *len) | |
502 | { | |
503 | struct page *page = alloc_page(GFP_ATOMIC); | |
2de2f7f4 | 504 | unsigned int page_off = VIRTIO_XDP_HEADROOM; |
72979a6c JF |
505 | |
506 | if (!page) | |
507 | return NULL; | |
508 | ||
509 | memcpy(page_address(page) + page_off, page_address(p) + offset, *len); | |
510 | page_off += *len; | |
511 | ||
56a86f84 | 512 | while (--*num_buf) { |
72979a6c JF |
513 | unsigned int buflen; |
514 | unsigned long ctx; | |
515 | void *buf; | |
516 | int off; | |
517 | ||
518 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &buflen); | |
519 | if (unlikely(!ctx)) | |
520 | goto err_buf; | |
521 | ||
56a86f84 JW |
522 | buf = mergeable_ctx_to_buf_address(ctx); |
523 | p = virt_to_head_page(buf); | |
524 | off = buf - page_address(p); | |
525 | ||
72979a6c JF |
526 | /* guard against a misconfigured or uncooperative backend that |
527 | * is sending packet larger than the MTU. | |
528 | */ | |
56a86f84 JW |
529 | if ((page_off + buflen) > PAGE_SIZE) { |
530 | put_page(p); | |
72979a6c | 531 | goto err_buf; |
56a86f84 | 532 | } |
72979a6c JF |
533 | |
534 | memcpy(page_address(page) + page_off, | |
535 | page_address(p) + off, buflen); | |
536 | page_off += buflen; | |
56a86f84 | 537 | put_page(p); |
72979a6c JF |
538 | } |
539 | ||
2de2f7f4 JF |
540 | /* Headroom does not contribute to packet length */ |
541 | *len = page_off - VIRTIO_XDP_HEADROOM; | |
72979a6c JF |
542 | return page; |
543 | err_buf: | |
544 | __free_pages(page, 0); | |
545 | return NULL; | |
546 | } | |
547 | ||
8fc3b9e9 | 548 | static struct sk_buff *receive_mergeable(struct net_device *dev, |
fdd819b2 | 549 | struct virtnet_info *vi, |
8fc3b9e9 | 550 | struct receive_queue *rq, |
ab7db917 | 551 | unsigned long ctx, |
8fc3b9e9 | 552 | unsigned int len) |
9ab86bbc | 553 | { |
ab7db917 | 554 | void *buf = mergeable_ctx_to_buf_address(ctx); |
012873d0 MT |
555 | struct virtio_net_hdr_mrg_rxbuf *hdr = buf; |
556 | u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); | |
8fc3b9e9 MT |
557 | struct page *page = virt_to_head_page(buf); |
558 | int offset = buf - page_address(page); | |
f600b690 JF |
559 | struct sk_buff *head_skb, *curr_skb; |
560 | struct bpf_prog *xdp_prog; | |
561 | unsigned int truesize; | |
562 | ||
56434a01 JF |
563 | head_skb = NULL; |
564 | ||
f600b690 JF |
565 | rcu_read_lock(); |
566 | xdp_prog = rcu_dereference(rq->xdp_prog); | |
567 | if (xdp_prog) { | |
72979a6c | 568 | struct page *xdp_page; |
0354e4d1 | 569 | struct xdp_buff xdp; |
0354e4d1 | 570 | void *data; |
f600b690 JF |
571 | u32 act; |
572 | ||
73b62bd0 | 573 | /* This happens when rx buffer size is underestimated */ |
f600b690 | 574 | if (unlikely(num_buf > 1)) { |
72979a6c | 575 | /* linearize data for XDP */ |
56a86f84 | 576 | xdp_page = xdp_linearize_page(rq, &num_buf, |
72979a6c JF |
577 | page, offset, &len); |
578 | if (!xdp_page) | |
579 | goto err_xdp; | |
2de2f7f4 | 580 | offset = VIRTIO_XDP_HEADROOM; |
72979a6c JF |
581 | } else { |
582 | xdp_page = page; | |
f600b690 JF |
583 | } |
584 | ||
585 | /* Transient failure which in theory could occur if | |
586 | * in-flight packets from before XDP was enabled reach | |
587 | * the receive path after XDP is loaded. In practice I | |
588 | * was not able to create this condition. | |
589 | */ | |
b00f70b0 | 590 | if (unlikely(hdr->hdr.gso_type)) |
f600b690 JF |
591 | goto err_xdp; |
592 | ||
2de2f7f4 JF |
593 | /* Allow consuming headroom but reserve enough space to push |
594 | * the descriptor on if we get an XDP_TX return code. | |
595 | */ | |
0354e4d1 | 596 | data = page_address(xdp_page) + offset; |
2de2f7f4 | 597 | xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len; |
0354e4d1 JF |
598 | xdp.data = data + vi->hdr_len; |
599 | xdp.data_end = xdp.data + (len - vi->hdr_len); | |
600 | act = bpf_prog_run_xdp(xdp_prog, &xdp); | |
601 | ||
56434a01 JF |
602 | switch (act) { |
603 | case XDP_PASS: | |
2de2f7f4 JF |
604 | /* recalculate offset to account for any header |
605 | * adjustments. Note other cases do not build an | |
606 | * skb and avoid using offset | |
607 | */ | |
608 | offset = xdp.data - | |
609 | page_address(xdp_page) - vi->hdr_len; | |
610 | ||
1830f893 JW |
611 | /* We can only create skb based on xdp_page. */ |
612 | if (unlikely(xdp_page != page)) { | |
613 | rcu_read_unlock(); | |
614 | put_page(page); | |
615 | head_skb = page_to_skb(vi, rq, xdp_page, | |
2de2f7f4 | 616 | offset, len, PAGE_SIZE); |
5c33474d | 617 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
1830f893 JW |
618 | return head_skb; |
619 | } | |
56434a01 JF |
620 | break; |
621 | case XDP_TX: | |
f6b10209 | 622 | if (unlikely(!virtnet_xdp_xmit(vi, rq, &xdp))) |
0354e4d1 | 623 | trace_xdp_exception(vi->dev, xdp_prog, act); |
5c33474d | 624 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
72979a6c JF |
625 | if (unlikely(xdp_page != page)) |
626 | goto err_xdp; | |
56434a01 JF |
627 | rcu_read_unlock(); |
628 | goto xdp_xmit; | |
56434a01 | 629 | default: |
0354e4d1 JF |
630 | bpf_warn_invalid_xdp_action(act); |
631 | case XDP_ABORTED: | |
632 | trace_xdp_exception(vi->dev, xdp_prog, act); | |
633 | case XDP_DROP: | |
72979a6c JF |
634 | if (unlikely(xdp_page != page)) |
635 | __free_pages(xdp_page, 0); | |
5c33474d | 636 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, len); |
f600b690 | 637 | goto err_xdp; |
56434a01 | 638 | } |
f600b690 JF |
639 | } |
640 | rcu_read_unlock(); | |
ab7db917 | 641 | |
f600b690 JF |
642 | truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
643 | head_skb = page_to_skb(vi, rq, page, offset, len, truesize); | |
644 | curr_skb = head_skb; | |
9ab86bbc | 645 | |
8fc3b9e9 MT |
646 | if (unlikely(!curr_skb)) |
647 | goto err_skb; | |
9ab86bbc | 648 | while (--num_buf) { |
8fc3b9e9 MT |
649 | int num_skb_frags; |
650 | ||
ab7db917 MD |
651 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
652 | if (unlikely(!ctx)) { | |
8fc3b9e9 | 653 | pr_debug("%s: rx error: %d buffers out of %d missing\n", |
fdd819b2 | 654 | dev->name, num_buf, |
012873d0 MT |
655 | virtio16_to_cpu(vi->vdev, |
656 | hdr->num_buffers)); | |
8fc3b9e9 MT |
657 | dev->stats.rx_length_errors++; |
658 | goto err_buf; | |
3f2c31d9 | 659 | } |
8fc3b9e9 | 660 | |
ab7db917 | 661 | buf = mergeable_ctx_to_buf_address(ctx); |
8fc3b9e9 | 662 | page = virt_to_head_page(buf); |
8fc3b9e9 MT |
663 | |
664 | num_skb_frags = skb_shinfo(curr_skb)->nr_frags; | |
2613af0e MD |
665 | if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { |
666 | struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); | |
8fc3b9e9 MT |
667 | |
668 | if (unlikely(!nskb)) | |
669 | goto err_skb; | |
2613af0e MD |
670 | if (curr_skb == head_skb) |
671 | skb_shinfo(curr_skb)->frag_list = nskb; | |
672 | else | |
673 | curr_skb->next = nskb; | |
674 | curr_skb = nskb; | |
675 | head_skb->truesize += nskb->truesize; | |
676 | num_skb_frags = 0; | |
677 | } | |
ab7db917 | 678 | truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); |
2613af0e MD |
679 | if (curr_skb != head_skb) { |
680 | head_skb->data_len += len; | |
681 | head_skb->len += len; | |
fb51879d | 682 | head_skb->truesize += truesize; |
2613af0e | 683 | } |
8fc3b9e9 | 684 | offset = buf - page_address(page); |
ba275241 JW |
685 | if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { |
686 | put_page(page); | |
687 | skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, | |
fb51879d | 688 | len, truesize); |
ba275241 JW |
689 | } else { |
690 | skb_add_rx_frag(curr_skb, num_skb_frags, page, | |
fb51879d | 691 | offset, len, truesize); |
ba275241 | 692 | } |
8fc3b9e9 MT |
693 | } |
694 | ||
5377d758 | 695 | ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); |
8fc3b9e9 MT |
696 | return head_skb; |
697 | ||
f600b690 JF |
698 | err_xdp: |
699 | rcu_read_unlock(); | |
8fc3b9e9 MT |
700 | err_skb: |
701 | put_page(page); | |
702 | while (--num_buf) { | |
ab7db917 MD |
703 | ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); |
704 | if (unlikely(!ctx)) { | |
8fc3b9e9 MT |
705 | pr_debug("%s: rx error: %d buffers missing\n", |
706 | dev->name, num_buf); | |
707 | dev->stats.rx_length_errors++; | |
708 | break; | |
709 | } | |
ab7db917 | 710 | page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); |
8fc3b9e9 | 711 | put_page(page); |
9ab86bbc | 712 | } |
8fc3b9e9 MT |
713 | err_buf: |
714 | dev->stats.rx_dropped++; | |
715 | dev_kfree_skb(head_skb); | |
56434a01 | 716 | xdp_xmit: |
8fc3b9e9 | 717 | return NULL; |
9ab86bbc SM |
718 | } |
719 | ||
61845d20 JW |
720 | static int receive_buf(struct virtnet_info *vi, struct receive_queue *rq, |
721 | void *buf, unsigned int len) | |
9ab86bbc | 722 | { |
e9d7417b | 723 | struct net_device *dev = vi->dev; |
9ab86bbc | 724 | struct sk_buff *skb; |
012873d0 | 725 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
61845d20 | 726 | int ret; |
3f2c31d9 | 727 | |
bcff3162 | 728 | if (unlikely(len < vi->hdr_len + ETH_HLEN)) { |
9ab86bbc SM |
729 | pr_debug("%s: short packet %i\n", dev->name, len); |
730 | dev->stats.rx_length_errors++; | |
ab7db917 MD |
731 | if (vi->mergeable_rx_bufs) { |
732 | unsigned long ctx = (unsigned long)buf; | |
733 | void *base = mergeable_ctx_to_buf_address(ctx); | |
734 | put_page(virt_to_head_page(base)); | |
735 | } else if (vi->big_packets) { | |
98bfd23c | 736 | give_pages(rq, buf); |
ab7db917 | 737 | } else { |
f6b10209 | 738 | put_page(virt_to_head_page(buf)); |
ab7db917 | 739 | } |
61845d20 | 740 | return 0; |
9ab86bbc | 741 | } |
3f2c31d9 | 742 | |
f121159d | 743 | if (vi->mergeable_rx_bufs) |
fdd819b2 | 744 | skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len); |
f121159d | 745 | else if (vi->big_packets) |
946fa564 | 746 | skb = receive_big(dev, vi, rq, buf, len); |
f121159d | 747 | else |
bb91accf | 748 | skb = receive_small(dev, vi, rq, buf, len); |
f121159d MT |
749 | |
750 | if (unlikely(!skb)) | |
61845d20 | 751 | return 0; |
3f2c31d9 | 752 | |
9ab86bbc | 753 | hdr = skb_vnet_hdr(skb); |
3fa2a1df | 754 | |
61845d20 | 755 | ret = skb->len; |
296f96fc | 756 | |
e858fae2 | 757 | if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) |
10a8d94a | 758 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
296f96fc | 759 | |
e858fae2 MR |
760 | if (virtio_net_hdr_to_skb(skb, &hdr->hdr, |
761 | virtio_is_little_endian(vi->vdev))) { | |
762 | net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", | |
763 | dev->name, hdr->hdr.gso_type, | |
764 | hdr->hdr.gso_size); | |
765 | goto frame_err; | |
296f96fc RR |
766 | } |
767 | ||
d1dc06dc MR |
768 | skb->protocol = eth_type_trans(skb, dev); |
769 | pr_debug("Receiving skb proto 0x%04x len %i type %i\n", | |
770 | ntohs(skb->protocol), skb->len, skb->pkt_type); | |
771 | ||
0fbd050a | 772 | napi_gro_receive(&rq->napi, skb); |
61845d20 | 773 | return ret; |
296f96fc RR |
774 | |
775 | frame_err: | |
776 | dev->stats.rx_frame_errors++; | |
296f96fc | 777 | dev_kfree_skb(skb); |
61845d20 | 778 | return 0; |
296f96fc RR |
779 | } |
780 | ||
946fa564 MT |
781 | static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, |
782 | gfp_t gfp) | |
296f96fc | 783 | { |
f6b10209 JW |
784 | struct page_frag *alloc_frag = &rq->alloc_frag; |
785 | char *buf; | |
2de2f7f4 | 786 | unsigned int xdp_headroom = virtnet_get_headroom(vi); |
f6b10209 | 787 | int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; |
9ab86bbc | 788 | int err; |
3f2c31d9 | 789 | |
f6b10209 JW |
790 | len = SKB_DATA_ALIGN(len) + |
791 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
792 | if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) | |
9ab86bbc | 793 | return -ENOMEM; |
296f96fc | 794 | |
f6b10209 JW |
795 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
796 | get_page(alloc_frag->page); | |
797 | alloc_frag->offset += len; | |
798 | sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, | |
799 | vi->hdr_len + GOOD_PACKET_LEN); | |
800 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, buf, gfp); | |
9ab86bbc | 801 | if (err < 0) |
f6b10209 | 802 | put_page(virt_to_head_page(buf)); |
97402b96 | 803 | |
9ab86bbc SM |
804 | return err; |
805 | } | |
97402b96 | 806 | |
012873d0 MT |
807 | static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, |
808 | gfp_t gfp) | |
9ab86bbc | 809 | { |
9ab86bbc SM |
810 | struct page *first, *list = NULL; |
811 | char *p; | |
812 | int i, err, offset; | |
813 | ||
a5835440 RR |
814 | sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); |
815 | ||
e9d7417b | 816 | /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ |
9ab86bbc | 817 | for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { |
e9d7417b | 818 | first = get_a_page(rq, gfp); |
9ab86bbc SM |
819 | if (!first) { |
820 | if (list) | |
e9d7417b | 821 | give_pages(rq, list); |
9ab86bbc | 822 | return -ENOMEM; |
97402b96 | 823 | } |
e9d7417b | 824 | sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); |
97402b96 | 825 | |
9ab86bbc SM |
826 | /* chain new page in list head to match sg */ |
827 | first->private = (unsigned long)list; | |
828 | list = first; | |
829 | } | |
296f96fc | 830 | |
e9d7417b | 831 | first = get_a_page(rq, gfp); |
9ab86bbc | 832 | if (!first) { |
e9d7417b | 833 | give_pages(rq, list); |
9ab86bbc SM |
834 | return -ENOMEM; |
835 | } | |
836 | p = page_address(first); | |
837 | ||
e9d7417b | 838 | /* rq->sg[0], rq->sg[1] share the same page */ |
012873d0 MT |
839 | /* a separated rq->sg[0] for header - required in case !any_header_sg */ |
840 | sg_set_buf(&rq->sg[0], p, vi->hdr_len); | |
9ab86bbc | 841 | |
e9d7417b | 842 | /* rq->sg[1] for data packet, from offset */ |
9ab86bbc | 843 | offset = sizeof(struct padded_vnet_hdr); |
e9d7417b | 844 | sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); |
9ab86bbc SM |
845 | |
846 | /* chain first in list head */ | |
847 | first->private = (unsigned long)list; | |
9dc7b9e4 RR |
848 | err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, |
849 | first, gfp); | |
9ab86bbc | 850 | if (err < 0) |
e9d7417b | 851 | give_pages(rq, first); |
9ab86bbc SM |
852 | |
853 | return err; | |
296f96fc RR |
854 | } |
855 | ||
5377d758 | 856 | static unsigned int get_mergeable_buf_len(struct ewma_pkt_len *avg_pkt_len) |
3f2c31d9 | 857 | { |
ab7db917 | 858 | const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
fbf28d78 MD |
859 | unsigned int len; |
860 | ||
5377d758 | 861 | len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), |
fbf28d78 MD |
862 | GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); |
863 | return ALIGN(len, MERGEABLE_BUFFER_ALIGN); | |
864 | } | |
865 | ||
2de2f7f4 JF |
866 | static int add_recvbuf_mergeable(struct virtnet_info *vi, |
867 | struct receive_queue *rq, gfp_t gfp) | |
fbf28d78 | 868 | { |
fb51879d | 869 | struct page_frag *alloc_frag = &rq->alloc_frag; |
2de2f7f4 | 870 | unsigned int headroom = virtnet_get_headroom(vi); |
fb51879d | 871 | char *buf; |
ab7db917 | 872 | unsigned long ctx; |
3f2c31d9 | 873 | int err; |
fb51879d | 874 | unsigned int len, hole; |
3f2c31d9 | 875 | |
fbf28d78 | 876 | len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); |
2de2f7f4 | 877 | if (unlikely(!skb_page_frag_refill(len + headroom, alloc_frag, gfp))) |
9ab86bbc | 878 | return -ENOMEM; |
ab7db917 | 879 | |
fb51879d | 880 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; |
2de2f7f4 | 881 | buf += headroom; /* advance address leaving hole at front of pkt */ |
ab7db917 | 882 | ctx = mergeable_buf_to_ctx(buf, len); |
fb51879d | 883 | get_page(alloc_frag->page); |
2de2f7f4 | 884 | alloc_frag->offset += len + headroom; |
fb51879d | 885 | hole = alloc_frag->size - alloc_frag->offset; |
2de2f7f4 | 886 | if (hole < len + headroom) { |
ab7db917 MD |
887 | /* To avoid internal fragmentation, if there is very likely not |
888 | * enough space for another buffer, add the remaining space to | |
889 | * the current buffer. This extra space is not included in | |
890 | * the truesize stored in ctx. | |
891 | */ | |
fb51879d MD |
892 | len += hole; |
893 | alloc_frag->offset += hole; | |
894 | } | |
3f2c31d9 | 895 | |
fb51879d | 896 | sg_init_one(rq->sg, buf, len); |
ab7db917 | 897 | err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); |
9ab86bbc | 898 | if (err < 0) |
2613af0e | 899 | put_page(virt_to_head_page(buf)); |
3f2c31d9 | 900 | |
9ab86bbc SM |
901 | return err; |
902 | } | |
3f2c31d9 | 903 | |
b2baed69 RR |
904 | /* |
905 | * Returns false if we couldn't fill entirely (OOM). | |
906 | * | |
907 | * Normally run in the receive path, but can also be run from ndo_open | |
908 | * before we're receiving packets, or from refill_work which is | |
909 | * careful to disable receiving (using napi_disable). | |
910 | */ | |
946fa564 MT |
911 | static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, |
912 | gfp_t gfp) | |
9ab86bbc SM |
913 | { |
914 | int err; | |
1788f495 | 915 | bool oom; |
3f2c31d9 | 916 | |
fb51879d | 917 | gfp |= __GFP_COLD; |
9ab86bbc SM |
918 | do { |
919 | if (vi->mergeable_rx_bufs) | |
2de2f7f4 | 920 | err = add_recvbuf_mergeable(vi, rq, gfp); |
9ab86bbc | 921 | else if (vi->big_packets) |
012873d0 | 922 | err = add_recvbuf_big(vi, rq, gfp); |
9ab86bbc | 923 | else |
946fa564 | 924 | err = add_recvbuf_small(vi, rq, gfp); |
3f2c31d9 | 925 | |
1788f495 | 926 | oom = err == -ENOMEM; |
9ed4cb07 | 927 | if (err) |
3f2c31d9 | 928 | break; |
b7dfde95 | 929 | } while (rq->vq->num_free); |
681daee2 | 930 | virtqueue_kick(rq->vq); |
3161e453 | 931 | return !oom; |
3f2c31d9 MM |
932 | } |
933 | ||
18445c4d | 934 | static void skb_recv_done(struct virtqueue *rvq) |
296f96fc RR |
935 | { |
936 | struct virtnet_info *vi = rvq->vdev->priv; | |
986a4f4d | 937 | struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; |
e9d7417b | 938 | |
18445c4d | 939 | /* Schedule NAPI, Suppress further interrupts if successful. */ |
e9d7417b | 940 | if (napi_schedule_prep(&rq->napi)) { |
1915a712 | 941 | virtqueue_disable_cb(rvq); |
e9d7417b | 942 | __napi_schedule(&rq->napi); |
18445c4d | 943 | } |
296f96fc RR |
944 | } |
945 | ||
e9d7417b | 946 | static void virtnet_napi_enable(struct receive_queue *rq) |
3e9d08ec | 947 | { |
e9d7417b | 948 | napi_enable(&rq->napi); |
3e9d08ec BR |
949 | |
950 | /* If all buffers were filled by other side before we napi_enabled, we | |
951 | * won't get another interrupt, so process any outstanding packets | |
952 | * now. virtnet_poll wants re-enable the queue, so we disable here. | |
953 | * We synchronize against interrupts via NAPI_STATE_SCHED */ | |
e9d7417b JW |
954 | if (napi_schedule_prep(&rq->napi)) { |
955 | virtqueue_disable_cb(rq->vq); | |
ec13ee80 | 956 | local_bh_disable(); |
e9d7417b | 957 | __napi_schedule(&rq->napi); |
ec13ee80 | 958 | local_bh_enable(); |
3e9d08ec BR |
959 | } |
960 | } | |
961 | ||
3161e453 RR |
962 | static void refill_work(struct work_struct *work) |
963 | { | |
e9d7417b JW |
964 | struct virtnet_info *vi = |
965 | container_of(work, struct virtnet_info, refill.work); | |
3161e453 | 966 | bool still_empty; |
986a4f4d JW |
967 | int i; |
968 | ||
55257d72 | 969 | for (i = 0; i < vi->curr_queue_pairs; i++) { |
986a4f4d | 970 | struct receive_queue *rq = &vi->rq[i]; |
3161e453 | 971 | |
986a4f4d | 972 | napi_disable(&rq->napi); |
946fa564 | 973 | still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); |
986a4f4d | 974 | virtnet_napi_enable(rq); |
3161e453 | 975 | |
986a4f4d JW |
976 | /* In theory, this can happen: if we don't get any buffers in |
977 | * we will *never* try to fill again. | |
978 | */ | |
979 | if (still_empty) | |
980 | schedule_delayed_work(&vi->refill, HZ/2); | |
981 | } | |
3161e453 RR |
982 | } |
983 | ||
2ffa7598 | 984 | static int virtnet_receive(struct receive_queue *rq, int budget) |
296f96fc | 985 | { |
e9d7417b | 986 | struct virtnet_info *vi = rq->vq->vdev->priv; |
61845d20 | 987 | unsigned int len, received = 0, bytes = 0; |
9ab86bbc | 988 | void *buf; |
61845d20 | 989 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
296f96fc | 990 | |
296f96fc | 991 | while (received < budget && |
e9d7417b | 992 | (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { |
61845d20 | 993 | bytes += receive_buf(vi, rq, buf, len); |
296f96fc RR |
994 | received++; |
995 | } | |
996 | ||
be121f46 | 997 | if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { |
946fa564 | 998 | if (!try_fill_recv(vi, rq, GFP_ATOMIC)) |
3b07e9ca | 999 | schedule_delayed_work(&vi->refill, 0); |
3161e453 | 1000 | } |
296f96fc | 1001 | |
61845d20 JW |
1002 | u64_stats_update_begin(&stats->rx_syncp); |
1003 | stats->rx_bytes += bytes; | |
1004 | stats->rx_packets += received; | |
1005 | u64_stats_update_end(&stats->rx_syncp); | |
1006 | ||
2ffa7598 JW |
1007 | return received; |
1008 | } | |
1009 | ||
1010 | static int virtnet_poll(struct napi_struct *napi, int budget) | |
1011 | { | |
1012 | struct receive_queue *rq = | |
1013 | container_of(napi, struct receive_queue, napi); | |
faadb05f | 1014 | unsigned int r, received; |
2ffa7598 | 1015 | |
faadb05f | 1016 | received = virtnet_receive(rq, budget); |
2ffa7598 | 1017 | |
8329d98e RR |
1018 | /* Out of packets? */ |
1019 | if (received < budget) { | |
cbdadbbf | 1020 | r = virtqueue_enable_cb_prepare(rq->vq); |
4d6308aa ED |
1021 | if (napi_complete_done(napi, received)) { |
1022 | if (unlikely(virtqueue_poll(rq->vq, r)) && | |
1023 | napi_schedule_prep(napi)) { | |
1024 | virtqueue_disable_cb(rq->vq); | |
1025 | __napi_schedule(napi); | |
1026 | } | |
4265f161 | 1027 | } |
296f96fc RR |
1028 | } |
1029 | ||
1030 | return received; | |
1031 | } | |
1032 | ||
986a4f4d JW |
1033 | static int virtnet_open(struct net_device *dev) |
1034 | { | |
1035 | struct virtnet_info *vi = netdev_priv(dev); | |
1036 | int i; | |
1037 | ||
e4166625 JW |
1038 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1039 | if (i < vi->curr_queue_pairs) | |
1040 | /* Make sure we have some buffers: if oom use wq. */ | |
946fa564 | 1041 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) |
e4166625 | 1042 | schedule_delayed_work(&vi->refill, 0); |
986a4f4d JW |
1043 | virtnet_napi_enable(&vi->rq[i]); |
1044 | } | |
1045 | ||
1046 | return 0; | |
1047 | } | |
1048 | ||
b7dfde95 | 1049 | static void free_old_xmit_skbs(struct send_queue *sq) |
296f96fc RR |
1050 | { |
1051 | struct sk_buff *skb; | |
6ee57bcc | 1052 | unsigned int len; |
e9d7417b | 1053 | struct virtnet_info *vi = sq->vq->vdev->priv; |
58472a76 | 1054 | struct virtnet_stats *stats = this_cpu_ptr(vi->stats); |
61845d20 JW |
1055 | unsigned int packets = 0; |
1056 | unsigned int bytes = 0; | |
296f96fc | 1057 | |
e9d7417b | 1058 | while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { |
296f96fc | 1059 | pr_debug("Sent skb %p\n", skb); |
3fa2a1df | 1060 | |
61845d20 JW |
1061 | bytes += skb->len; |
1062 | packets++; | |
3fa2a1df | 1063 | |
ed79bab8 | 1064 | dev_kfree_skb_any(skb); |
296f96fc | 1065 | } |
61845d20 JW |
1066 | |
1067 | /* Avoid overhead when no packets have been processed | |
1068 | * happens when called speculatively from start_xmit. | |
1069 | */ | |
1070 | if (!packets) | |
1071 | return; | |
1072 | ||
1073 | u64_stats_update_begin(&stats->tx_syncp); | |
1074 | stats->tx_bytes += bytes; | |
1075 | stats->tx_packets += packets; | |
1076 | u64_stats_update_end(&stats->tx_syncp); | |
296f96fc RR |
1077 | } |
1078 | ||
e9d7417b | 1079 | static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) |
296f96fc | 1080 | { |
012873d0 | 1081 | struct virtio_net_hdr_mrg_rxbuf *hdr; |
296f96fc | 1082 | const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; |
e9d7417b | 1083 | struct virtnet_info *vi = sq->vq->vdev->priv; |
7bedc7dc | 1084 | unsigned num_sg; |
012873d0 | 1085 | unsigned hdr_len = vi->hdr_len; |
e7428e95 | 1086 | bool can_push; |
296f96fc | 1087 | |
e174961c | 1088 | pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); |
e7428e95 MT |
1089 | |
1090 | can_push = vi->any_header_sg && | |
1091 | !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && | |
1092 | !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; | |
1093 | /* Even if we can, don't push here yet as this would skew | |
1094 | * csum_start offset below. */ | |
1095 | if (can_push) | |
012873d0 | 1096 | hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); |
e7428e95 MT |
1097 | else |
1098 | hdr = skb_vnet_hdr(skb); | |
296f96fc | 1099 | |
e858fae2 | 1100 | if (virtio_net_hdr_from_skb(skb, &hdr->hdr, |
6391a448 | 1101 | virtio_is_little_endian(vi->vdev), false)) |
e858fae2 | 1102 | BUG(); |
296f96fc | 1103 | |
3f2c31d9 | 1104 | if (vi->mergeable_rx_bufs) |
012873d0 | 1105 | hdr->num_buffers = 0; |
3f2c31d9 | 1106 | |
547c890c | 1107 | sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); |
e7428e95 MT |
1108 | if (can_push) { |
1109 | __skb_push(skb, hdr_len); | |
1110 | num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); | |
1111 | /* Pull header back to avoid skew in tx bytes calculations. */ | |
1112 | __skb_pull(skb, hdr_len); | |
1113 | } else { | |
1114 | sg_set_buf(sq->sg, hdr, hdr_len); | |
1115 | num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; | |
1116 | } | |
9dc7b9e4 | 1117 | return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); |
11a3a154 RR |
1118 | } |
1119 | ||
424efe9c | 1120 | static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) |
99ffc696 RR |
1121 | { |
1122 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d JW |
1123 | int qnum = skb_get_queue_mapping(skb); |
1124 | struct send_queue *sq = &vi->sq[qnum]; | |
9ed4cb07 | 1125 | int err; |
4b7fd2e6 MT |
1126 | struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); |
1127 | bool kick = !skb->xmit_more; | |
2cb9c6ba | 1128 | |
2cb9c6ba | 1129 | /* Free up any pending old buffers before queueing new ones. */ |
e9d7417b | 1130 | free_old_xmit_skbs(sq); |
99ffc696 | 1131 | |
074c3582 JK |
1132 | /* timestamp packet in software */ |
1133 | skb_tx_timestamp(skb); | |
1134 | ||
03f191ba | 1135 | /* Try to transmit */ |
b7dfde95 | 1136 | err = xmit_skb(sq, skb); |
48925e37 | 1137 | |
9ed4cb07 | 1138 | /* This should not happen! */ |
681daee2 | 1139 | if (unlikely(err)) { |
9ed4cb07 RR |
1140 | dev->stats.tx_fifo_errors++; |
1141 | if (net_ratelimit()) | |
1142 | dev_warn(&dev->dev, | |
b7dfde95 | 1143 | "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); |
58eba97d | 1144 | dev->stats.tx_dropped++; |
85e94525 | 1145 | dev_kfree_skb_any(skb); |
58eba97d | 1146 | return NETDEV_TX_OK; |
296f96fc | 1147 | } |
03f191ba | 1148 | |
48925e37 RR |
1149 | /* Don't wait up for transmitted skbs to be freed. */ |
1150 | skb_orphan(skb); | |
1151 | nf_reset(skb); | |
1152 | ||
60302ff6 MT |
1153 | /* If running out of space, stop queue to avoid getting packets that we |
1154 | * are then unable to transmit. | |
1155 | * An alternative would be to force queuing layer to requeue the skb by | |
1156 | * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be | |
1157 | * returned in a normal path of operation: it means that driver is not | |
1158 | * maintaining the TX queue stop/start state properly, and causes | |
1159 | * the stack to do a non-trivial amount of useless work. | |
1160 | * Since most packets only take 1 or 2 ring slots, stopping the queue | |
1161 | * early means 16 slots are typically wasted. | |
d631b94e | 1162 | */ |
b7dfde95 | 1163 | if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { |
986a4f4d | 1164 | netif_stop_subqueue(dev, qnum); |
e9d7417b | 1165 | if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { |
48925e37 | 1166 | /* More just got used, free them then recheck. */ |
b7dfde95 LT |
1167 | free_old_xmit_skbs(sq); |
1168 | if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { | |
986a4f4d | 1169 | netif_start_subqueue(dev, qnum); |
e9d7417b | 1170 | virtqueue_disable_cb(sq->vq); |
48925e37 RR |
1171 | } |
1172 | } | |
99ffc696 | 1173 | } |
48925e37 | 1174 | |
4b7fd2e6 | 1175 | if (kick || netif_xmit_stopped(txq)) |
0b725a2c | 1176 | virtqueue_kick(sq->vq); |
296f96fc | 1177 | |
0b725a2c | 1178 | return NETDEV_TX_OK; |
c223a078 DM |
1179 | } |
1180 | ||
40cbfc37 AK |
1181 | /* |
1182 | * Send command via the control virtqueue and check status. Commands | |
1183 | * supported by the hypervisor, as indicated by feature bits, should | |
788a8b6d | 1184 | * never fail unless improperly formatted. |
40cbfc37 AK |
1185 | */ |
1186 | static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, | |
d24bae32 | 1187 | struct scatterlist *out) |
40cbfc37 | 1188 | { |
f7bc9594 | 1189 | struct scatterlist *sgs[4], hdr, stat; |
d24bae32 | 1190 | unsigned out_num = 0, tmp; |
40cbfc37 AK |
1191 | |
1192 | /* Caller should know better */ | |
f7bc9594 | 1193 | BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); |
40cbfc37 | 1194 | |
2ac46030 MT |
1195 | vi->ctrl_status = ~0; |
1196 | vi->ctrl_hdr.class = class; | |
1197 | vi->ctrl_hdr.cmd = cmd; | |
f7bc9594 | 1198 | /* Add header */ |
2ac46030 | 1199 | sg_init_one(&hdr, &vi->ctrl_hdr, sizeof(vi->ctrl_hdr)); |
f7bc9594 | 1200 | sgs[out_num++] = &hdr; |
40cbfc37 | 1201 | |
f7bc9594 RR |
1202 | if (out) |
1203 | sgs[out_num++] = out; | |
40cbfc37 | 1204 | |
f7bc9594 | 1205 | /* Add return status. */ |
2ac46030 | 1206 | sg_init_one(&stat, &vi->ctrl_status, sizeof(vi->ctrl_status)); |
d24bae32 | 1207 | sgs[out_num] = &stat; |
40cbfc37 | 1208 | |
d24bae32 | 1209 | BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); |
a7c58146 | 1210 | virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); |
40cbfc37 | 1211 | |
67975901 | 1212 | if (unlikely(!virtqueue_kick(vi->cvq))) |
2ac46030 | 1213 | return vi->ctrl_status == VIRTIO_NET_OK; |
40cbfc37 AK |
1214 | |
1215 | /* Spin for a response, the kick causes an ioport write, trapping | |
1216 | * into the hypervisor, so the request should be handled immediately. | |
1217 | */ | |
047b9b94 HG |
1218 | while (!virtqueue_get_buf(vi->cvq, &tmp) && |
1219 | !virtqueue_is_broken(vi->cvq)) | |
40cbfc37 AK |
1220 | cpu_relax(); |
1221 | ||
2ac46030 | 1222 | return vi->ctrl_status == VIRTIO_NET_OK; |
40cbfc37 AK |
1223 | } |
1224 | ||
9c46f6d4 AW |
1225 | static int virtnet_set_mac_address(struct net_device *dev, void *p) |
1226 | { | |
1227 | struct virtnet_info *vi = netdev_priv(dev); | |
1228 | struct virtio_device *vdev = vi->vdev; | |
f2f2c8b4 | 1229 | int ret; |
e37e2ff3 | 1230 | struct sockaddr *addr; |
7e58d5ae | 1231 | struct scatterlist sg; |
9c46f6d4 | 1232 | |
801822d1 | 1233 | addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); |
e37e2ff3 AL |
1234 | if (!addr) |
1235 | return -ENOMEM; | |
e37e2ff3 AL |
1236 | |
1237 | ret = eth_prepare_mac_addr_change(dev, addr); | |
f2f2c8b4 | 1238 | if (ret) |
e37e2ff3 | 1239 | goto out; |
9c46f6d4 | 1240 | |
7e58d5ae AK |
1241 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { |
1242 | sg_init_one(&sg, addr->sa_data, dev->addr_len); | |
1243 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1244 | VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { |
7e58d5ae AK |
1245 | dev_warn(&vdev->dev, |
1246 | "Failed to set mac address by vq command.\n"); | |
e37e2ff3 AL |
1247 | ret = -EINVAL; |
1248 | goto out; | |
7e58d5ae | 1249 | } |
7e93a02f MT |
1250 | } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && |
1251 | !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { | |
855e0c52 RR |
1252 | unsigned int i; |
1253 | ||
1254 | /* Naturally, this has an atomicity problem. */ | |
1255 | for (i = 0; i < dev->addr_len; i++) | |
1256 | virtio_cwrite8(vdev, | |
1257 | offsetof(struct virtio_net_config, mac) + | |
1258 | i, addr->sa_data[i]); | |
7e58d5ae AK |
1259 | } |
1260 | ||
1261 | eth_commit_mac_addr_change(dev, p); | |
e37e2ff3 | 1262 | ret = 0; |
9c46f6d4 | 1263 | |
e37e2ff3 AL |
1264 | out: |
1265 | kfree(addr); | |
1266 | return ret; | |
9c46f6d4 AW |
1267 | } |
1268 | ||
bc1f4470 | 1269 | static void virtnet_stats(struct net_device *dev, |
1270 | struct rtnl_link_stats64 *tot) | |
3fa2a1df | 1271 | { |
1272 | struct virtnet_info *vi = netdev_priv(dev); | |
1273 | int cpu; | |
1274 | unsigned int start; | |
1275 | ||
1276 | for_each_possible_cpu(cpu) { | |
58472a76 | 1277 | struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); |
3fa2a1df | 1278 | u64 tpackets, tbytes, rpackets, rbytes; |
1279 | ||
1280 | do { | |
57a7744e | 1281 | start = u64_stats_fetch_begin_irq(&stats->tx_syncp); |
3fa2a1df | 1282 | tpackets = stats->tx_packets; |
1283 | tbytes = stats->tx_bytes; | |
57a7744e | 1284 | } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); |
83a27052 ED |
1285 | |
1286 | do { | |
57a7744e | 1287 | start = u64_stats_fetch_begin_irq(&stats->rx_syncp); |
3fa2a1df | 1288 | rpackets = stats->rx_packets; |
1289 | rbytes = stats->rx_bytes; | |
57a7744e | 1290 | } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); |
3fa2a1df | 1291 | |
1292 | tot->rx_packets += rpackets; | |
1293 | tot->tx_packets += tpackets; | |
1294 | tot->rx_bytes += rbytes; | |
1295 | tot->tx_bytes += tbytes; | |
1296 | } | |
1297 | ||
1298 | tot->tx_dropped = dev->stats.tx_dropped; | |
021ac8d3 | 1299 | tot->tx_fifo_errors = dev->stats.tx_fifo_errors; |
3fa2a1df | 1300 | tot->rx_dropped = dev->stats.rx_dropped; |
1301 | tot->rx_length_errors = dev->stats.rx_length_errors; | |
1302 | tot->rx_frame_errors = dev->stats.rx_frame_errors; | |
3fa2a1df | 1303 | } |
1304 | ||
da74e89d AS |
1305 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1306 | static void virtnet_netpoll(struct net_device *dev) | |
1307 | { | |
1308 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1309 | int i; |
da74e89d | 1310 | |
986a4f4d JW |
1311 | for (i = 0; i < vi->curr_queue_pairs; i++) |
1312 | napi_schedule(&vi->rq[i].napi); | |
da74e89d AS |
1313 | } |
1314 | #endif | |
1315 | ||
586d17c5 JW |
1316 | static void virtnet_ack_link_announce(struct virtnet_info *vi) |
1317 | { | |
1318 | rtnl_lock(); | |
1319 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, | |
d24bae32 | 1320 | VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) |
586d17c5 JW |
1321 | dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); |
1322 | rtnl_unlock(); | |
1323 | } | |
1324 | ||
47315329 | 1325 | static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
986a4f4d JW |
1326 | { |
1327 | struct scatterlist sg; | |
986a4f4d JW |
1328 | struct net_device *dev = vi->dev; |
1329 | ||
1330 | if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) | |
1331 | return 0; | |
1332 | ||
a725ee3e AL |
1333 | vi->ctrl_mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); |
1334 | sg_init_one(&sg, &vi->ctrl_mq, sizeof(vi->ctrl_mq)); | |
986a4f4d JW |
1335 | |
1336 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, | |
d24bae32 | 1337 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { |
986a4f4d JW |
1338 | dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", |
1339 | queue_pairs); | |
1340 | return -EINVAL; | |
55257d72 | 1341 | } else { |
986a4f4d | 1342 | vi->curr_queue_pairs = queue_pairs; |
35ed159b JW |
1343 | /* virtnet_open() will refill when device is going to up. */ |
1344 | if (dev->flags & IFF_UP) | |
1345 | schedule_delayed_work(&vi->refill, 0); | |
55257d72 | 1346 | } |
986a4f4d JW |
1347 | |
1348 | return 0; | |
1349 | } | |
1350 | ||
47315329 JF |
1351 | static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) |
1352 | { | |
1353 | int err; | |
1354 | ||
1355 | rtnl_lock(); | |
1356 | err = _virtnet_set_queues(vi, queue_pairs); | |
1357 | rtnl_unlock(); | |
1358 | return err; | |
1359 | } | |
1360 | ||
296f96fc RR |
1361 | static int virtnet_close(struct net_device *dev) |
1362 | { | |
1363 | struct virtnet_info *vi = netdev_priv(dev); | |
986a4f4d | 1364 | int i; |
296f96fc | 1365 | |
b2baed69 RR |
1366 | /* Make sure refill_work doesn't re-enable napi! */ |
1367 | cancel_delayed_work_sync(&vi->refill); | |
986a4f4d JW |
1368 | |
1369 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1370 | napi_disable(&vi->rq[i].napi); | |
296f96fc | 1371 | |
296f96fc RR |
1372 | return 0; |
1373 | } | |
1374 | ||
2af7698e AW |
1375 | static void virtnet_set_rx_mode(struct net_device *dev) |
1376 | { | |
1377 | struct virtnet_info *vi = netdev_priv(dev); | |
f565a7c2 | 1378 | struct scatterlist sg[2]; |
f565a7c2 | 1379 | struct virtio_net_ctrl_mac *mac_data; |
ccffad25 | 1380 | struct netdev_hw_addr *ha; |
32e7bfc4 | 1381 | int uc_count; |
4cd24eaf | 1382 | int mc_count; |
f565a7c2 AW |
1383 | void *buf; |
1384 | int i; | |
2af7698e | 1385 | |
788a8b6d | 1386 | /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ |
2af7698e AW |
1387 | if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) |
1388 | return; | |
1389 | ||
2ac46030 MT |
1390 | vi->ctrl_promisc = ((dev->flags & IFF_PROMISC) != 0); |
1391 | vi->ctrl_allmulti = ((dev->flags & IFF_ALLMULTI) != 0); | |
2af7698e | 1392 | |
2ac46030 | 1393 | sg_init_one(sg, &vi->ctrl_promisc, sizeof(vi->ctrl_promisc)); |
2af7698e AW |
1394 | |
1395 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1396 | VIRTIO_NET_CTRL_RX_PROMISC, sg)) |
2af7698e | 1397 | dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", |
2ac46030 | 1398 | vi->ctrl_promisc ? "en" : "dis"); |
2af7698e | 1399 | |
2ac46030 | 1400 | sg_init_one(sg, &vi->ctrl_allmulti, sizeof(vi->ctrl_allmulti)); |
2af7698e AW |
1401 | |
1402 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, | |
d24bae32 | 1403 | VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) |
2af7698e | 1404 | dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", |
2ac46030 | 1405 | vi->ctrl_allmulti ? "en" : "dis"); |
f565a7c2 | 1406 | |
32e7bfc4 | 1407 | uc_count = netdev_uc_count(dev); |
4cd24eaf | 1408 | mc_count = netdev_mc_count(dev); |
f565a7c2 | 1409 | /* MAC filter - use one buffer for both lists */ |
4cd24eaf JP |
1410 | buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + |
1411 | (2 * sizeof(mac_data->entries)), GFP_ATOMIC); | |
1412 | mac_data = buf; | |
e68ed8f0 | 1413 | if (!buf) |
f565a7c2 | 1414 | return; |
f565a7c2 | 1415 | |
23e258e1 AW |
1416 | sg_init_table(sg, 2); |
1417 | ||
f565a7c2 | 1418 | /* Store the unicast list and count in the front of the buffer */ |
fdd819b2 | 1419 | mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); |
ccffad25 | 1420 | i = 0; |
32e7bfc4 | 1421 | netdev_for_each_uc_addr(ha, dev) |
ccffad25 | 1422 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); |
f565a7c2 AW |
1423 | |
1424 | sg_set_buf(&sg[0], mac_data, | |
32e7bfc4 | 1425 | sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); |
f565a7c2 AW |
1426 | |
1427 | /* multicast list and count fill the end */ | |
32e7bfc4 | 1428 | mac_data = (void *)&mac_data->macs[uc_count][0]; |
f565a7c2 | 1429 | |
fdd819b2 | 1430 | mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); |
567ec874 | 1431 | i = 0; |
22bedad3 JP |
1432 | netdev_for_each_mc_addr(ha, dev) |
1433 | memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); | |
f565a7c2 AW |
1434 | |
1435 | sg_set_buf(&sg[1], mac_data, | |
4cd24eaf | 1436 | sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); |
f565a7c2 AW |
1437 | |
1438 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, | |
d24bae32 | 1439 | VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) |
99e872ae | 1440 | dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); |
f565a7c2 AW |
1441 | |
1442 | kfree(buf); | |
2af7698e AW |
1443 | } |
1444 | ||
80d5c368 PM |
1445 | static int virtnet_vlan_rx_add_vid(struct net_device *dev, |
1446 | __be16 proto, u16 vid) | |
0bde9569 AW |
1447 | { |
1448 | struct virtnet_info *vi = netdev_priv(dev); | |
1449 | struct scatterlist sg; | |
1450 | ||
a725ee3e AL |
1451 | vi->ctrl_vid = vid; |
1452 | sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid)); | |
0bde9569 AW |
1453 | |
1454 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1455 | VIRTIO_NET_CTRL_VLAN_ADD, &sg)) |
0bde9569 | 1456 | dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); |
8e586137 | 1457 | return 0; |
0bde9569 AW |
1458 | } |
1459 | ||
80d5c368 PM |
1460 | static int virtnet_vlan_rx_kill_vid(struct net_device *dev, |
1461 | __be16 proto, u16 vid) | |
0bde9569 AW |
1462 | { |
1463 | struct virtnet_info *vi = netdev_priv(dev); | |
1464 | struct scatterlist sg; | |
1465 | ||
a725ee3e AL |
1466 | vi->ctrl_vid = vid; |
1467 | sg_init_one(&sg, &vi->ctrl_vid, sizeof(vi->ctrl_vid)); | |
0bde9569 AW |
1468 | |
1469 | if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, | |
d24bae32 | 1470 | VIRTIO_NET_CTRL_VLAN_DEL, &sg)) |
0bde9569 | 1471 | dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); |
8e586137 | 1472 | return 0; |
0bde9569 AW |
1473 | } |
1474 | ||
8898c21c | 1475 | static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) |
986a4f4d JW |
1476 | { |
1477 | int i; | |
1478 | ||
8898c21c WG |
1479 | if (vi->affinity_hint_set) { |
1480 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
47be2479 WG |
1481 | virtqueue_set_affinity(vi->rq[i].vq, -1); |
1482 | virtqueue_set_affinity(vi->sq[i].vq, -1); | |
1483 | } | |
1484 | ||
8898c21c WG |
1485 | vi->affinity_hint_set = false; |
1486 | } | |
8898c21c | 1487 | } |
47be2479 | 1488 | |
8898c21c WG |
1489 | static void virtnet_set_affinity(struct virtnet_info *vi) |
1490 | { | |
1491 | int i; | |
1492 | int cpu; | |
986a4f4d JW |
1493 | |
1494 | /* In multiqueue mode, when the number of cpu is equal to the number of | |
1495 | * queue pairs, we let the queue pairs to be private to one cpu by | |
1496 | * setting the affinity hint to eliminate the contention. | |
1497 | */ | |
8898c21c WG |
1498 | if (vi->curr_queue_pairs == 1 || |
1499 | vi->max_queue_pairs != num_online_cpus()) { | |
1500 | virtnet_clean_affinity(vi, -1); | |
1501 | return; | |
986a4f4d JW |
1502 | } |
1503 | ||
8898c21c WG |
1504 | i = 0; |
1505 | for_each_online_cpu(cpu) { | |
986a4f4d JW |
1506 | virtqueue_set_affinity(vi->rq[i].vq, cpu); |
1507 | virtqueue_set_affinity(vi->sq[i].vq, cpu); | |
9bb8ca86 | 1508 | netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); |
8898c21c | 1509 | i++; |
986a4f4d JW |
1510 | } |
1511 | ||
8898c21c | 1512 | vi->affinity_hint_set = true; |
986a4f4d JW |
1513 | } |
1514 | ||
8017c279 | 1515 | static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) |
8de4b2f3 | 1516 | { |
8017c279 SAS |
1517 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, |
1518 | node); | |
1519 | virtnet_set_affinity(vi); | |
1520 | return 0; | |
1521 | } | |
8de4b2f3 | 1522 | |
8017c279 SAS |
1523 | static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) |
1524 | { | |
1525 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
1526 | node_dead); | |
1527 | virtnet_set_affinity(vi); | |
1528 | return 0; | |
1529 | } | |
3ab098df | 1530 | |
8017c279 SAS |
1531 | static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) |
1532 | { | |
1533 | struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, | |
1534 | node); | |
1535 | ||
1536 | virtnet_clean_affinity(vi, cpu); | |
1537 | return 0; | |
1538 | } | |
1539 | ||
1540 | static enum cpuhp_state virtionet_online; | |
1541 | ||
1542 | static int virtnet_cpu_notif_add(struct virtnet_info *vi) | |
1543 | { | |
1544 | int ret; | |
1545 | ||
1546 | ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); | |
1547 | if (ret) | |
1548 | return ret; | |
1549 | ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
1550 | &vi->node_dead); | |
1551 | if (!ret) | |
1552 | return ret; | |
1553 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
1554 | return ret; | |
1555 | } | |
1556 | ||
1557 | static void virtnet_cpu_notif_remove(struct virtnet_info *vi) | |
1558 | { | |
1559 | cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); | |
1560 | cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, | |
1561 | &vi->node_dead); | |
986a4f4d JW |
1562 | } |
1563 | ||
8f9f4668 RJ |
1564 | static void virtnet_get_ringparam(struct net_device *dev, |
1565 | struct ethtool_ringparam *ring) | |
1566 | { | |
1567 | struct virtnet_info *vi = netdev_priv(dev); | |
1568 | ||
986a4f4d JW |
1569 | ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); |
1570 | ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); | |
8f9f4668 RJ |
1571 | ring->rx_pending = ring->rx_max_pending; |
1572 | ring->tx_pending = ring->tx_max_pending; | |
8f9f4668 RJ |
1573 | } |
1574 | ||
66846048 RJ |
1575 | |
1576 | static void virtnet_get_drvinfo(struct net_device *dev, | |
1577 | struct ethtool_drvinfo *info) | |
1578 | { | |
1579 | struct virtnet_info *vi = netdev_priv(dev); | |
1580 | struct virtio_device *vdev = vi->vdev; | |
1581 | ||
1582 | strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); | |
1583 | strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); | |
1584 | strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); | |
1585 | ||
1586 | } | |
1587 | ||
d73bcd2c JW |
1588 | /* TODO: Eliminate OOO packets during switching */ |
1589 | static int virtnet_set_channels(struct net_device *dev, | |
1590 | struct ethtool_channels *channels) | |
1591 | { | |
1592 | struct virtnet_info *vi = netdev_priv(dev); | |
1593 | u16 queue_pairs = channels->combined_count; | |
1594 | int err; | |
1595 | ||
1596 | /* We don't support separate rx/tx channels. | |
1597 | * We don't allow setting 'other' channels. | |
1598 | */ | |
1599 | if (channels->rx_count || channels->tx_count || channels->other_count) | |
1600 | return -EINVAL; | |
1601 | ||
c18e9cd6 | 1602 | if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) |
d73bcd2c JW |
1603 | return -EINVAL; |
1604 | ||
f600b690 JF |
1605 | /* For now we don't support modifying channels while XDP is loaded |
1606 | * also when XDP is loaded all RX queues have XDP programs so we only | |
1607 | * need to check a single RX queue. | |
1608 | */ | |
1609 | if (vi->rq[0].xdp_prog) | |
1610 | return -EINVAL; | |
1611 | ||
47be2479 | 1612 | get_online_cpus(); |
47315329 | 1613 | err = _virtnet_set_queues(vi, queue_pairs); |
d73bcd2c JW |
1614 | if (!err) { |
1615 | netif_set_real_num_tx_queues(dev, queue_pairs); | |
1616 | netif_set_real_num_rx_queues(dev, queue_pairs); | |
1617 | ||
8898c21c | 1618 | virtnet_set_affinity(vi); |
d73bcd2c | 1619 | } |
47be2479 | 1620 | put_online_cpus(); |
d73bcd2c JW |
1621 | |
1622 | return err; | |
1623 | } | |
1624 | ||
1625 | static void virtnet_get_channels(struct net_device *dev, | |
1626 | struct ethtool_channels *channels) | |
1627 | { | |
1628 | struct virtnet_info *vi = netdev_priv(dev); | |
1629 | ||
1630 | channels->combined_count = vi->curr_queue_pairs; | |
1631 | channels->max_combined = vi->max_queue_pairs; | |
1632 | channels->max_other = 0; | |
1633 | channels->rx_count = 0; | |
1634 | channels->tx_count = 0; | |
1635 | channels->other_count = 0; | |
1636 | } | |
1637 | ||
16032be5 NA |
1638 | /* Check if the user is trying to change anything besides speed/duplex */ |
1639 | static bool virtnet_validate_ethtool_cmd(const struct ethtool_cmd *cmd) | |
1640 | { | |
1641 | struct ethtool_cmd diff1 = *cmd; | |
1642 | struct ethtool_cmd diff2 = {}; | |
1643 | ||
0cf3ace9 NA |
1644 | /* cmd is always set so we need to clear it, validate the port type |
1645 | * and also without autonegotiation we can ignore advertising | |
1646 | */ | |
16032be5 | 1647 | ethtool_cmd_speed_set(&diff1, 0); |
0cf3ace9 | 1648 | diff2.port = PORT_OTHER; |
16032be5 NA |
1649 | diff1.advertising = 0; |
1650 | diff1.duplex = 0; | |
16032be5 NA |
1651 | diff1.cmd = 0; |
1652 | ||
1653 | return !memcmp(&diff1, &diff2, sizeof(diff1)); | |
1654 | } | |
1655 | ||
1656 | static int virtnet_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1657 | { | |
1658 | struct virtnet_info *vi = netdev_priv(dev); | |
1659 | u32 speed; | |
1660 | ||
1661 | speed = ethtool_cmd_speed(cmd); | |
1662 | /* don't allow custom speed and duplex */ | |
1663 | if (!ethtool_validate_speed(speed) || | |
1664 | !ethtool_validate_duplex(cmd->duplex) || | |
1665 | !virtnet_validate_ethtool_cmd(cmd)) | |
1666 | return -EINVAL; | |
1667 | vi->speed = speed; | |
1668 | vi->duplex = cmd->duplex; | |
1669 | ||
1670 | return 0; | |
1671 | } | |
1672 | ||
1673 | static int virtnet_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1674 | { | |
1675 | struct virtnet_info *vi = netdev_priv(dev); | |
1676 | ||
1677 | ethtool_cmd_speed_set(cmd, vi->speed); | |
1678 | cmd->duplex = vi->duplex; | |
1679 | cmd->port = PORT_OTHER; | |
1680 | ||
1681 | return 0; | |
1682 | } | |
1683 | ||
1684 | static void virtnet_init_settings(struct net_device *dev) | |
1685 | { | |
1686 | struct virtnet_info *vi = netdev_priv(dev); | |
1687 | ||
1688 | vi->speed = SPEED_UNKNOWN; | |
1689 | vi->duplex = DUPLEX_UNKNOWN; | |
1690 | } | |
1691 | ||
0fc0b732 | 1692 | static const struct ethtool_ops virtnet_ethtool_ops = { |
66846048 | 1693 | .get_drvinfo = virtnet_get_drvinfo, |
9f4d26d0 | 1694 | .get_link = ethtool_op_get_link, |
8f9f4668 | 1695 | .get_ringparam = virtnet_get_ringparam, |
d73bcd2c JW |
1696 | .set_channels = virtnet_set_channels, |
1697 | .get_channels = virtnet_get_channels, | |
074c3582 | 1698 | .get_ts_info = ethtool_op_get_ts_info, |
16032be5 NA |
1699 | .get_settings = virtnet_get_settings, |
1700 | .set_settings = virtnet_set_settings, | |
a9ea3fc6 HX |
1701 | }; |
1702 | ||
9fe7bfce JF |
1703 | static void virtnet_freeze_down(struct virtio_device *vdev) |
1704 | { | |
1705 | struct virtnet_info *vi = vdev->priv; | |
1706 | int i; | |
1707 | ||
1708 | /* Make sure no work handler is accessing the device */ | |
1709 | flush_work(&vi->config_work); | |
1710 | ||
1711 | netif_device_detach(vi->dev); | |
1712 | cancel_delayed_work_sync(&vi->refill); | |
1713 | ||
1714 | if (netif_running(vi->dev)) { | |
1715 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1716 | napi_disable(&vi->rq[i].napi); | |
1717 | } | |
1718 | } | |
1719 | ||
1720 | static int init_vqs(struct virtnet_info *vi); | |
2de2f7f4 | 1721 | static void _remove_vq_common(struct virtnet_info *vi); |
9fe7bfce JF |
1722 | |
1723 | static int virtnet_restore_up(struct virtio_device *vdev) | |
1724 | { | |
1725 | struct virtnet_info *vi = vdev->priv; | |
1726 | int err, i; | |
1727 | ||
1728 | err = init_vqs(vi); | |
1729 | if (err) | |
1730 | return err; | |
1731 | ||
1732 | virtio_device_ready(vdev); | |
1733 | ||
1734 | if (netif_running(vi->dev)) { | |
1735 | for (i = 0; i < vi->curr_queue_pairs; i++) | |
1736 | if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) | |
1737 | schedule_delayed_work(&vi->refill, 0); | |
1738 | ||
1739 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1740 | virtnet_napi_enable(&vi->rq[i]); | |
1741 | } | |
1742 | ||
1743 | netif_device_attach(vi->dev); | |
1744 | return err; | |
1745 | } | |
1746 | ||
017b29c3 | 1747 | static int virtnet_reset(struct virtnet_info *vi, int curr_qp, int xdp_qp) |
2de2f7f4 JF |
1748 | { |
1749 | struct virtio_device *dev = vi->vdev; | |
1750 | int ret; | |
1751 | ||
1752 | virtio_config_disable(dev); | |
1753 | dev->failed = dev->config->get_status(dev) & VIRTIO_CONFIG_S_FAILED; | |
1754 | virtnet_freeze_down(dev); | |
1755 | _remove_vq_common(vi); | |
1756 | ||
1757 | dev->config->reset(dev); | |
1758 | virtio_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE); | |
1759 | virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER); | |
1760 | ||
1761 | ret = virtio_finalize_features(dev); | |
1762 | if (ret) | |
1763 | goto err; | |
1764 | ||
017b29c3 | 1765 | vi->xdp_queue_pairs = xdp_qp; |
2de2f7f4 JF |
1766 | ret = virtnet_restore_up(dev); |
1767 | if (ret) | |
1768 | goto err; | |
017b29c3 | 1769 | ret = _virtnet_set_queues(vi, curr_qp); |
2de2f7f4 JF |
1770 | if (ret) |
1771 | goto err; | |
1772 | ||
1773 | virtio_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); | |
1774 | virtio_config_enable(dev); | |
1775 | return 0; | |
1776 | err: | |
1777 | virtio_add_status(dev, VIRTIO_CONFIG_S_FAILED); | |
1778 | return ret; | |
1779 | } | |
1780 | ||
f600b690 JF |
1781 | static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog) |
1782 | { | |
1783 | unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); | |
1784 | struct virtnet_info *vi = netdev_priv(dev); | |
1785 | struct bpf_prog *old_prog; | |
017b29c3 | 1786 | u16 xdp_qp = 0, curr_qp; |
672aafd5 | 1787 | int i, err; |
f600b690 JF |
1788 | |
1789 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || | |
92502fe8 JW |
1790 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || |
1791 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || | |
1792 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO)) { | |
f600b690 JF |
1793 | netdev_warn(dev, "can't set XDP while host is implementing LRO, disable LRO first\n"); |
1794 | return -EOPNOTSUPP; | |
1795 | } | |
1796 | ||
1797 | if (vi->mergeable_rx_bufs && !vi->any_header_sg) { | |
1798 | netdev_warn(dev, "XDP expects header/data in single page, any_header_sg required\n"); | |
1799 | return -EINVAL; | |
1800 | } | |
1801 | ||
1802 | if (dev->mtu > max_sz) { | |
1803 | netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); | |
1804 | return -EINVAL; | |
1805 | } | |
1806 | ||
672aafd5 JF |
1807 | curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; |
1808 | if (prog) | |
1809 | xdp_qp = nr_cpu_ids; | |
1810 | ||
1811 | /* XDP requires extra queues for XDP_TX */ | |
1812 | if (curr_qp + xdp_qp > vi->max_queue_pairs) { | |
1813 | netdev_warn(dev, "request %i queues but max is %i\n", | |
1814 | curr_qp + xdp_qp, vi->max_queue_pairs); | |
1815 | return -ENOMEM; | |
1816 | } | |
1817 | ||
2de2f7f4 JF |
1818 | if (prog) { |
1819 | prog = bpf_prog_add(prog, vi->max_queue_pairs - 1); | |
1820 | if (IS_ERR(prog)) | |
1821 | return PTR_ERR(prog); | |
1822 | } | |
1823 | ||
2de2f7f4 JF |
1824 | /* Changing the headroom in buffers is a disruptive operation because |
1825 | * existing buffers must be flushed and reallocated. This will happen | |
1826 | * when a xdp program is initially added or xdp is disabled by removing | |
1827 | * the xdp program resulting in number of XDP queues changing. | |
1828 | */ | |
1829 | if (vi->xdp_queue_pairs != xdp_qp) { | |
017b29c3 JW |
1830 | err = virtnet_reset(vi, curr_qp + xdp_qp, xdp_qp); |
1831 | if (err) { | |
1832 | dev_warn(&dev->dev, "XDP reset failure.\n"); | |
2de2f7f4 | 1833 | goto virtio_reset_err; |
017b29c3 | 1834 | } |
f600b690 JF |
1835 | } |
1836 | ||
672aafd5 JF |
1837 | netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); |
1838 | ||
f600b690 JF |
1839 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1840 | old_prog = rtnl_dereference(vi->rq[i].xdp_prog); | |
1841 | rcu_assign_pointer(vi->rq[i].xdp_prog, prog); | |
1842 | if (old_prog) | |
1843 | bpf_prog_put(old_prog); | |
1844 | } | |
1845 | ||
1846 | return 0; | |
2de2f7f4 JF |
1847 | |
1848 | virtio_reset_err: | |
1849 | /* On reset error do our best to unwind XDP changes inflight and return | |
1850 | * error up to user space for resolution. The underlying reset hung on | |
1851 | * us so not much we can do here. | |
1852 | */ | |
2de2f7f4 JF |
1853 | if (prog) |
1854 | bpf_prog_sub(prog, vi->max_queue_pairs - 1); | |
1855 | return err; | |
f600b690 JF |
1856 | } |
1857 | ||
1858 | static bool virtnet_xdp_query(struct net_device *dev) | |
1859 | { | |
1860 | struct virtnet_info *vi = netdev_priv(dev); | |
1861 | int i; | |
1862 | ||
1863 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1864 | if (vi->rq[i].xdp_prog) | |
1865 | return true; | |
1866 | } | |
1867 | return false; | |
1868 | } | |
1869 | ||
1870 | static int virtnet_xdp(struct net_device *dev, struct netdev_xdp *xdp) | |
1871 | { | |
1872 | switch (xdp->command) { | |
1873 | case XDP_SETUP_PROG: | |
1874 | return virtnet_xdp_set(dev, xdp->prog); | |
1875 | case XDP_QUERY_PROG: | |
1876 | xdp->prog_attached = virtnet_xdp_query(dev); | |
1877 | return 0; | |
1878 | default: | |
1879 | return -EINVAL; | |
1880 | } | |
1881 | } | |
1882 | ||
76288b4e SH |
1883 | static const struct net_device_ops virtnet_netdev = { |
1884 | .ndo_open = virtnet_open, | |
1885 | .ndo_stop = virtnet_close, | |
1886 | .ndo_start_xmit = start_xmit, | |
1887 | .ndo_validate_addr = eth_validate_addr, | |
9c46f6d4 | 1888 | .ndo_set_mac_address = virtnet_set_mac_address, |
2af7698e | 1889 | .ndo_set_rx_mode = virtnet_set_rx_mode, |
3fa2a1df | 1890 | .ndo_get_stats64 = virtnet_stats, |
1824a989 AW |
1891 | .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, |
1892 | .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, | |
76288b4e SH |
1893 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1894 | .ndo_poll_controller = virtnet_netpoll, | |
91815639 | 1895 | #endif |
f600b690 | 1896 | .ndo_xdp = virtnet_xdp, |
76288b4e SH |
1897 | }; |
1898 | ||
586d17c5 | 1899 | static void virtnet_config_changed_work(struct work_struct *work) |
9f4d26d0 | 1900 | { |
586d17c5 JW |
1901 | struct virtnet_info *vi = |
1902 | container_of(work, struct virtnet_info, config_work); | |
9f4d26d0 MM |
1903 | u16 v; |
1904 | ||
855e0c52 RR |
1905 | if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, |
1906 | struct virtio_net_config, status, &v) < 0) | |
507613bf | 1907 | return; |
586d17c5 JW |
1908 | |
1909 | if (v & VIRTIO_NET_S_ANNOUNCE) { | |
ee89bab1 | 1910 | netdev_notify_peers(vi->dev); |
586d17c5 JW |
1911 | virtnet_ack_link_announce(vi); |
1912 | } | |
9f4d26d0 MM |
1913 | |
1914 | /* Ignore unknown (future) status bits */ | |
1915 | v &= VIRTIO_NET_S_LINK_UP; | |
1916 | ||
1917 | if (vi->status == v) | |
507613bf | 1918 | return; |
9f4d26d0 MM |
1919 | |
1920 | vi->status = v; | |
1921 | ||
1922 | if (vi->status & VIRTIO_NET_S_LINK_UP) { | |
1923 | netif_carrier_on(vi->dev); | |
986a4f4d | 1924 | netif_tx_wake_all_queues(vi->dev); |
9f4d26d0 MM |
1925 | } else { |
1926 | netif_carrier_off(vi->dev); | |
986a4f4d | 1927 | netif_tx_stop_all_queues(vi->dev); |
9f4d26d0 MM |
1928 | } |
1929 | } | |
1930 | ||
1931 | static void virtnet_config_changed(struct virtio_device *vdev) | |
1932 | { | |
1933 | struct virtnet_info *vi = vdev->priv; | |
1934 | ||
3b07e9ca | 1935 | schedule_work(&vi->config_work); |
9f4d26d0 MM |
1936 | } |
1937 | ||
986a4f4d JW |
1938 | static void virtnet_free_queues(struct virtnet_info *vi) |
1939 | { | |
d4fb84ee AV |
1940 | int i; |
1941 | ||
ab3971b1 JW |
1942 | for (i = 0; i < vi->max_queue_pairs; i++) { |
1943 | napi_hash_del(&vi->rq[i].napi); | |
d4fb84ee | 1944 | netif_napi_del(&vi->rq[i].napi); |
ab3971b1 | 1945 | } |
d4fb84ee | 1946 | |
963abe5c ED |
1947 | /* We called napi_hash_del() before netif_napi_del(), |
1948 | * we need to respect an RCU grace period before freeing vi->rq | |
1949 | */ | |
1950 | synchronize_net(); | |
1951 | ||
986a4f4d JW |
1952 | kfree(vi->rq); |
1953 | kfree(vi->sq); | |
1954 | } | |
1955 | ||
47315329 | 1956 | static void _free_receive_bufs(struct virtnet_info *vi) |
986a4f4d | 1957 | { |
f600b690 | 1958 | struct bpf_prog *old_prog; |
986a4f4d JW |
1959 | int i; |
1960 | ||
1961 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
1962 | while (vi->rq[i].pages) | |
1963 | __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); | |
f600b690 JF |
1964 | |
1965 | old_prog = rtnl_dereference(vi->rq[i].xdp_prog); | |
1966 | RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); | |
1967 | if (old_prog) | |
1968 | bpf_prog_put(old_prog); | |
986a4f4d | 1969 | } |
47315329 JF |
1970 | } |
1971 | ||
1972 | static void free_receive_bufs(struct virtnet_info *vi) | |
1973 | { | |
1974 | rtnl_lock(); | |
1975 | _free_receive_bufs(vi); | |
f600b690 | 1976 | rtnl_unlock(); |
986a4f4d JW |
1977 | } |
1978 | ||
fb51879d MD |
1979 | static void free_receive_page_frags(struct virtnet_info *vi) |
1980 | { | |
1981 | int i; | |
1982 | for (i = 0; i < vi->max_queue_pairs; i++) | |
1983 | if (vi->rq[i].alloc_frag.page) | |
1984 | put_page(vi->rq[i].alloc_frag.page); | |
1985 | } | |
1986 | ||
b68df015 | 1987 | static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) |
56434a01 JF |
1988 | { |
1989 | if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) | |
1990 | return false; | |
1991 | else if (q < vi->curr_queue_pairs) | |
1992 | return true; | |
1993 | else | |
1994 | return false; | |
1995 | } | |
1996 | ||
986a4f4d JW |
1997 | static void free_unused_bufs(struct virtnet_info *vi) |
1998 | { | |
1999 | void *buf; | |
2000 | int i; | |
2001 | ||
2002 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2003 | struct virtqueue *vq = vi->sq[i].vq; | |
56434a01 | 2004 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { |
b68df015 | 2005 | if (!is_xdp_raw_buffer_queue(vi, i)) |
56434a01 JF |
2006 | dev_kfree_skb(buf); |
2007 | else | |
2008 | put_page(virt_to_head_page(buf)); | |
2009 | } | |
986a4f4d JW |
2010 | } |
2011 | ||
2012 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2013 | struct virtqueue *vq = vi->rq[i].vq; | |
2014 | ||
2015 | while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { | |
ab7db917 MD |
2016 | if (vi->mergeable_rx_bufs) { |
2017 | unsigned long ctx = (unsigned long)buf; | |
2018 | void *base = mergeable_ctx_to_buf_address(ctx); | |
2019 | put_page(virt_to_head_page(base)); | |
2020 | } else if (vi->big_packets) { | |
fa9fac17 | 2021 | give_pages(&vi->rq[i], buf); |
ab7db917 | 2022 | } else { |
f6b10209 | 2023 | put_page(virt_to_head_page(buf)); |
ab7db917 | 2024 | } |
986a4f4d | 2025 | } |
986a4f4d JW |
2026 | } |
2027 | } | |
2028 | ||
e9d7417b JW |
2029 | static void virtnet_del_vqs(struct virtnet_info *vi) |
2030 | { | |
2031 | struct virtio_device *vdev = vi->vdev; | |
2032 | ||
8898c21c | 2033 | virtnet_clean_affinity(vi, -1); |
986a4f4d | 2034 | |
e9d7417b | 2035 | vdev->config->del_vqs(vdev); |
986a4f4d JW |
2036 | |
2037 | virtnet_free_queues(vi); | |
e9d7417b JW |
2038 | } |
2039 | ||
986a4f4d | 2040 | static int virtnet_find_vqs(struct virtnet_info *vi) |
3f9c10b0 | 2041 | { |
986a4f4d JW |
2042 | vq_callback_t **callbacks; |
2043 | struct virtqueue **vqs; | |
2044 | int ret = -ENOMEM; | |
2045 | int i, total_vqs; | |
2046 | const char **names; | |
2047 | ||
2048 | /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by | |
2049 | * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by | |
2050 | * possible control vq. | |
2051 | */ | |
2052 | total_vqs = vi->max_queue_pairs * 2 + | |
2053 | virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); | |
2054 | ||
2055 | /* Allocate space for find_vqs parameters */ | |
2056 | vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); | |
2057 | if (!vqs) | |
2058 | goto err_vq; | |
2059 | callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); | |
2060 | if (!callbacks) | |
2061 | goto err_callback; | |
2062 | names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); | |
2063 | if (!names) | |
2064 | goto err_names; | |
2065 | ||
2066 | /* Parameters for control virtqueue, if any */ | |
2067 | if (vi->has_cvq) { | |
2068 | callbacks[total_vqs - 1] = NULL; | |
2069 | names[total_vqs - 1] = "control"; | |
2070 | } | |
3f9c10b0 | 2071 | |
986a4f4d JW |
2072 | /* Allocate/initialize parameters for send/receive virtqueues */ |
2073 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2074 | callbacks[rxq2vq(i)] = skb_recv_done; | |
2075 | callbacks[txq2vq(i)] = skb_xmit_done; | |
2076 | sprintf(vi->rq[i].name, "input.%d", i); | |
2077 | sprintf(vi->sq[i].name, "output.%d", i); | |
2078 | names[rxq2vq(i)] = vi->rq[i].name; | |
2079 | names[txq2vq(i)] = vi->sq[i].name; | |
2080 | } | |
3f9c10b0 | 2081 | |
986a4f4d JW |
2082 | ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, |
2083 | names); | |
2084 | if (ret) | |
2085 | goto err_find; | |
3f9c10b0 | 2086 | |
986a4f4d JW |
2087 | if (vi->has_cvq) { |
2088 | vi->cvq = vqs[total_vqs - 1]; | |
3f9c10b0 | 2089 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) |
f646968f | 2090 | vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; |
3f9c10b0 | 2091 | } |
986a4f4d JW |
2092 | |
2093 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2094 | vi->rq[i].vq = vqs[rxq2vq(i)]; | |
2095 | vi->sq[i].vq = vqs[txq2vq(i)]; | |
2096 | } | |
2097 | ||
2098 | kfree(names); | |
2099 | kfree(callbacks); | |
2100 | kfree(vqs); | |
2101 | ||
3f9c10b0 | 2102 | return 0; |
986a4f4d JW |
2103 | |
2104 | err_find: | |
2105 | kfree(names); | |
2106 | err_names: | |
2107 | kfree(callbacks); | |
2108 | err_callback: | |
2109 | kfree(vqs); | |
2110 | err_vq: | |
2111 | return ret; | |
2112 | } | |
2113 | ||
2114 | static int virtnet_alloc_queues(struct virtnet_info *vi) | |
2115 | { | |
2116 | int i; | |
2117 | ||
2118 | vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); | |
2119 | if (!vi->sq) | |
2120 | goto err_sq; | |
2121 | vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); | |
008d4278 | 2122 | if (!vi->rq) |
986a4f4d JW |
2123 | goto err_rq; |
2124 | ||
2125 | INIT_DELAYED_WORK(&vi->refill, refill_work); | |
2126 | for (i = 0; i < vi->max_queue_pairs; i++) { | |
2127 | vi->rq[i].pages = NULL; | |
2128 | netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, | |
2129 | napi_weight); | |
2130 | ||
2131 | sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); | |
5377d758 | 2132 | ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); |
986a4f4d JW |
2133 | sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); |
2134 | } | |
2135 | ||
2136 | return 0; | |
2137 | ||
2138 | err_rq: | |
2139 | kfree(vi->sq); | |
2140 | err_sq: | |
2141 | return -ENOMEM; | |
2142 | } | |
2143 | ||
2144 | static int init_vqs(struct virtnet_info *vi) | |
2145 | { | |
2146 | int ret; | |
2147 | ||
2148 | /* Allocate send & receive queues */ | |
2149 | ret = virtnet_alloc_queues(vi); | |
2150 | if (ret) | |
2151 | goto err; | |
2152 | ||
2153 | ret = virtnet_find_vqs(vi); | |
2154 | if (ret) | |
2155 | goto err_free; | |
2156 | ||
47be2479 | 2157 | get_online_cpus(); |
8898c21c | 2158 | virtnet_set_affinity(vi); |
47be2479 WG |
2159 | put_online_cpus(); |
2160 | ||
986a4f4d JW |
2161 | return 0; |
2162 | ||
2163 | err_free: | |
2164 | virtnet_free_queues(vi); | |
2165 | err: | |
2166 | return ret; | |
3f9c10b0 AS |
2167 | } |
2168 | ||
fbf28d78 MD |
2169 | #ifdef CONFIG_SYSFS |
2170 | static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, | |
2171 | struct rx_queue_attribute *attribute, char *buf) | |
2172 | { | |
2173 | struct virtnet_info *vi = netdev_priv(queue->dev); | |
2174 | unsigned int queue_index = get_netdev_rx_queue_index(queue); | |
5377d758 | 2175 | struct ewma_pkt_len *avg; |
fbf28d78 MD |
2176 | |
2177 | BUG_ON(queue_index >= vi->max_queue_pairs); | |
2178 | avg = &vi->rq[queue_index].mrg_avg_pkt_len; | |
2179 | return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); | |
2180 | } | |
2181 | ||
2182 | static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = | |
2183 | __ATTR_RO(mergeable_rx_buffer_size); | |
2184 | ||
2185 | static struct attribute *virtio_net_mrg_rx_attrs[] = { | |
2186 | &mergeable_rx_buffer_size_attribute.attr, | |
2187 | NULL | |
2188 | }; | |
2189 | ||
2190 | static const struct attribute_group virtio_net_mrg_rx_group = { | |
2191 | .name = "virtio_net", | |
2192 | .attrs = virtio_net_mrg_rx_attrs | |
2193 | }; | |
2194 | #endif | |
2195 | ||
892d6eb1 JW |
2196 | static bool virtnet_fail_on_feature(struct virtio_device *vdev, |
2197 | unsigned int fbit, | |
2198 | const char *fname, const char *dname) | |
2199 | { | |
2200 | if (!virtio_has_feature(vdev, fbit)) | |
2201 | return false; | |
2202 | ||
2203 | dev_err(&vdev->dev, "device advertises feature %s but not %s", | |
2204 | fname, dname); | |
2205 | ||
2206 | return true; | |
2207 | } | |
2208 | ||
2209 | #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ | |
2210 | virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) | |
2211 | ||
2212 | static bool virtnet_validate_features(struct virtio_device *vdev) | |
2213 | { | |
2214 | if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && | |
2215 | (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, | |
2216 | "VIRTIO_NET_F_CTRL_VQ") || | |
2217 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, | |
2218 | "VIRTIO_NET_F_CTRL_VQ") || | |
2219 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, | |
2220 | "VIRTIO_NET_F_CTRL_VQ") || | |
2221 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || | |
2222 | VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, | |
2223 | "VIRTIO_NET_F_CTRL_VQ"))) { | |
2224 | return false; | |
2225 | } | |
2226 | ||
2227 | return true; | |
2228 | } | |
2229 | ||
d0c2c997 JW |
2230 | #define MIN_MTU ETH_MIN_MTU |
2231 | #define MAX_MTU ETH_MAX_MTU | |
2232 | ||
296f96fc RR |
2233 | static int virtnet_probe(struct virtio_device *vdev) |
2234 | { | |
986a4f4d | 2235 | int i, err; |
296f96fc RR |
2236 | struct net_device *dev; |
2237 | struct virtnet_info *vi; | |
986a4f4d | 2238 | u16 max_queue_pairs; |
14de9d11 | 2239 | int mtu; |
986a4f4d | 2240 | |
6ba42248 MT |
2241 | if (!vdev->config->get) { |
2242 | dev_err(&vdev->dev, "%s failure: config access disabled\n", | |
2243 | __func__); | |
2244 | return -EINVAL; | |
2245 | } | |
2246 | ||
892d6eb1 JW |
2247 | if (!virtnet_validate_features(vdev)) |
2248 | return -EINVAL; | |
2249 | ||
986a4f4d | 2250 | /* Find if host supports multiqueue virtio_net device */ |
855e0c52 RR |
2251 | err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, |
2252 | struct virtio_net_config, | |
2253 | max_virtqueue_pairs, &max_queue_pairs); | |
986a4f4d JW |
2254 | |
2255 | /* We need at least 2 queue's */ | |
2256 | if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || | |
2257 | max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || | |
2258 | !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) | |
2259 | max_queue_pairs = 1; | |
296f96fc RR |
2260 | |
2261 | /* Allocate ourselves a network device with room for our info */ | |
986a4f4d | 2262 | dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); |
296f96fc RR |
2263 | if (!dev) |
2264 | return -ENOMEM; | |
2265 | ||
2266 | /* Set up network device as normal. */ | |
f2f2c8b4 | 2267 | dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; |
76288b4e | 2268 | dev->netdev_ops = &virtnet_netdev; |
296f96fc | 2269 | dev->features = NETIF_F_HIGHDMA; |
3fa2a1df | 2270 | |
7ad24ea4 | 2271 | dev->ethtool_ops = &virtnet_ethtool_ops; |
296f96fc RR |
2272 | SET_NETDEV_DEV(dev, &vdev->dev); |
2273 | ||
2274 | /* Do we support "hardware" checksums? */ | |
98e778c9 | 2275 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { |
296f96fc | 2276 | /* This opens up the world of extra features. */ |
48900cb6 | 2277 | dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 | 2278 | if (csum) |
48900cb6 | 2279 | dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; |
98e778c9 MM |
2280 | |
2281 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { | |
e3e3c423 | 2282 | dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO |
34a48579 RR |
2283 | | NETIF_F_TSO_ECN | NETIF_F_TSO6; |
2284 | } | |
5539ae96 | 2285 | /* Individual feature bits: what can host handle? */ |
98e778c9 MM |
2286 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) |
2287 | dev->hw_features |= NETIF_F_TSO; | |
2288 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) | |
2289 | dev->hw_features |= NETIF_F_TSO6; | |
2290 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) | |
2291 | dev->hw_features |= NETIF_F_TSO_ECN; | |
e3e3c423 VY |
2292 | if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) |
2293 | dev->hw_features |= NETIF_F_UFO; | |
98e778c9 | 2294 | |
41f2f127 JW |
2295 | dev->features |= NETIF_F_GSO_ROBUST; |
2296 | ||
98e778c9 | 2297 | if (gso) |
e3e3c423 | 2298 | dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); |
98e778c9 | 2299 | /* (!csum && gso) case will be fixed by register_netdev() */ |
296f96fc | 2300 | } |
4f49129b TH |
2301 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) |
2302 | dev->features |= NETIF_F_RXCSUM; | |
296f96fc | 2303 | |
4fda8302 JW |
2304 | dev->vlan_features = dev->features; |
2305 | ||
d0c2c997 JW |
2306 | /* MTU range: 68 - 65535 */ |
2307 | dev->min_mtu = MIN_MTU; | |
2308 | dev->max_mtu = MAX_MTU; | |
2309 | ||
296f96fc | 2310 | /* Configuration may specify what MAC to use. Otherwise random. */ |
855e0c52 RR |
2311 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) |
2312 | virtio_cread_bytes(vdev, | |
2313 | offsetof(struct virtio_net_config, mac), | |
2314 | dev->dev_addr, dev->addr_len); | |
2315 | else | |
f2cedb63 | 2316 | eth_hw_addr_random(dev); |
296f96fc RR |
2317 | |
2318 | /* Set up our device-specific information */ | |
2319 | vi = netdev_priv(dev); | |
296f96fc RR |
2320 | vi->dev = dev; |
2321 | vi->vdev = vdev; | |
d9d5dcc8 | 2322 | vdev->priv = vi; |
3fa2a1df | 2323 | vi->stats = alloc_percpu(struct virtnet_stats); |
2324 | err = -ENOMEM; | |
2325 | if (vi->stats == NULL) | |
2326 | goto free; | |
2327 | ||
827da44c JS |
2328 | for_each_possible_cpu(i) { |
2329 | struct virtnet_stats *virtnet_stats; | |
2330 | virtnet_stats = per_cpu_ptr(vi->stats, i); | |
2331 | u64_stats_init(&virtnet_stats->tx_syncp); | |
2332 | u64_stats_init(&virtnet_stats->rx_syncp); | |
2333 | } | |
2334 | ||
586d17c5 | 2335 | INIT_WORK(&vi->config_work, virtnet_config_changed_work); |
296f96fc | 2336 | |
97402b96 | 2337 | /* If we can receive ANY GSO packets, we must allocate large ones. */ |
8e95a202 JP |
2338 | if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || |
2339 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || | |
e3e3c423 VY |
2340 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || |
2341 | virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) | |
97402b96 HX |
2342 | vi->big_packets = true; |
2343 | ||
3f2c31d9 MM |
2344 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) |
2345 | vi->mergeable_rx_bufs = true; | |
2346 | ||
d04302b3 MT |
2347 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || |
2348 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
012873d0 MT |
2349 | vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); |
2350 | else | |
2351 | vi->hdr_len = sizeof(struct virtio_net_hdr); | |
2352 | ||
75993300 MT |
2353 | if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || |
2354 | virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) | |
e7428e95 MT |
2355 | vi->any_header_sg = true; |
2356 | ||
986a4f4d JW |
2357 | if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) |
2358 | vi->has_cvq = true; | |
2359 | ||
14de9d11 AC |
2360 | if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { |
2361 | mtu = virtio_cread16(vdev, | |
2362 | offsetof(struct virtio_net_config, | |
2363 | mtu)); | |
93a205ee | 2364 | if (mtu < dev->min_mtu) { |
14de9d11 | 2365 | __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); |
93a205ee | 2366 | } else { |
d0c2c997 | 2367 | dev->mtu = mtu; |
93a205ee AC |
2368 | dev->max_mtu = mtu; |
2369 | } | |
14de9d11 AC |
2370 | } |
2371 | ||
012873d0 MT |
2372 | if (vi->any_header_sg) |
2373 | dev->needed_headroom = vi->hdr_len; | |
6ebbc1a6 | 2374 | |
44900010 JW |
2375 | /* Enable multiqueue by default */ |
2376 | if (num_online_cpus() >= max_queue_pairs) | |
2377 | vi->curr_queue_pairs = max_queue_pairs; | |
2378 | else | |
2379 | vi->curr_queue_pairs = num_online_cpus(); | |
986a4f4d JW |
2380 | vi->max_queue_pairs = max_queue_pairs; |
2381 | ||
2382 | /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ | |
3f9c10b0 | 2383 | err = init_vqs(vi); |
d2a7ddda | 2384 | if (err) |
9bb8ca86 | 2385 | goto free_stats; |
296f96fc | 2386 | |
fbf28d78 MD |
2387 | #ifdef CONFIG_SYSFS |
2388 | if (vi->mergeable_rx_bufs) | |
2389 | dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; | |
2390 | #endif | |
0f13b66b ZYW |
2391 | netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); |
2392 | netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); | |
986a4f4d | 2393 | |
16032be5 NA |
2394 | virtnet_init_settings(dev); |
2395 | ||
296f96fc RR |
2396 | err = register_netdev(dev); |
2397 | if (err) { | |
2398 | pr_debug("virtio_net: registering device failed\n"); | |
d2a7ddda | 2399 | goto free_vqs; |
296f96fc | 2400 | } |
b3369c1f | 2401 | |
4baf1e33 MT |
2402 | virtio_device_ready(vdev); |
2403 | ||
8017c279 | 2404 | err = virtnet_cpu_notif_add(vi); |
8de4b2f3 WG |
2405 | if (err) { |
2406 | pr_debug("virtio_net: registering cpu notifier failed\n"); | |
f00e35e2 | 2407 | goto free_unregister_netdev; |
8de4b2f3 WG |
2408 | } |
2409 | ||
a220871b | 2410 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
44900010 | 2411 | |
167c25e4 JW |
2412 | /* Assume link up if device can't report link status, |
2413 | otherwise get link status from config. */ | |
2414 | if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { | |
2415 | netif_carrier_off(dev); | |
3b07e9ca | 2416 | schedule_work(&vi->config_work); |
167c25e4 JW |
2417 | } else { |
2418 | vi->status = VIRTIO_NET_S_LINK_UP; | |
2419 | netif_carrier_on(dev); | |
2420 | } | |
9f4d26d0 | 2421 | |
986a4f4d JW |
2422 | pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", |
2423 | dev->name, max_queue_pairs); | |
2424 | ||
296f96fc RR |
2425 | return 0; |
2426 | ||
f00e35e2 | 2427 | free_unregister_netdev: |
02465555 MT |
2428 | vi->vdev->config->reset(vdev); |
2429 | ||
b3369c1f | 2430 | unregister_netdev(dev); |
d2a7ddda | 2431 | free_vqs: |
986a4f4d | 2432 | cancel_delayed_work_sync(&vi->refill); |
fb51879d | 2433 | free_receive_page_frags(vi); |
e9d7417b | 2434 | virtnet_del_vqs(vi); |
3fa2a1df | 2435 | free_stats: |
2436 | free_percpu(vi->stats); | |
296f96fc RR |
2437 | free: |
2438 | free_netdev(dev); | |
2439 | return err; | |
2440 | } | |
2441 | ||
2de2f7f4 JF |
2442 | static void _remove_vq_common(struct virtnet_info *vi) |
2443 | { | |
2444 | vi->vdev->config->reset(vi->vdev); | |
2445 | free_unused_bufs(vi); | |
2446 | _free_receive_bufs(vi); | |
2447 | free_receive_page_frags(vi); | |
2448 | virtnet_del_vqs(vi); | |
2449 | } | |
2450 | ||
04486ed0 | 2451 | static void remove_vq_common(struct virtnet_info *vi) |
296f96fc | 2452 | { |
04486ed0 | 2453 | vi->vdev->config->reset(vi->vdev); |
830a8a97 SM |
2454 | |
2455 | /* Free unused buffers in both send and recv, if any. */ | |
9ab86bbc | 2456 | free_unused_bufs(vi); |
fb6813f4 | 2457 | |
986a4f4d | 2458 | free_receive_bufs(vi); |
d2a7ddda | 2459 | |
fb51879d MD |
2460 | free_receive_page_frags(vi); |
2461 | ||
986a4f4d | 2462 | virtnet_del_vqs(vi); |
04486ed0 AS |
2463 | } |
2464 | ||
8cc085d6 | 2465 | static void virtnet_remove(struct virtio_device *vdev) |
04486ed0 AS |
2466 | { |
2467 | struct virtnet_info *vi = vdev->priv; | |
2468 | ||
8017c279 | 2469 | virtnet_cpu_notif_remove(vi); |
8de4b2f3 | 2470 | |
102a2786 MT |
2471 | /* Make sure no work handler is accessing the device. */ |
2472 | flush_work(&vi->config_work); | |
586d17c5 | 2473 | |
04486ed0 AS |
2474 | unregister_netdev(vi->dev); |
2475 | ||
2476 | remove_vq_common(vi); | |
fb6813f4 | 2477 | |
2e66f55b | 2478 | free_percpu(vi->stats); |
74b2553f | 2479 | free_netdev(vi->dev); |
296f96fc RR |
2480 | } |
2481 | ||
89107000 | 2482 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
2483 | static int virtnet_freeze(struct virtio_device *vdev) |
2484 | { | |
2485 | struct virtnet_info *vi = vdev->priv; | |
2486 | ||
8017c279 | 2487 | virtnet_cpu_notif_remove(vi); |
9fe7bfce | 2488 | virtnet_freeze_down(vdev); |
0741bcb5 AS |
2489 | remove_vq_common(vi); |
2490 | ||
2491 | return 0; | |
2492 | } | |
2493 | ||
2494 | static int virtnet_restore(struct virtio_device *vdev) | |
2495 | { | |
2496 | struct virtnet_info *vi = vdev->priv; | |
9fe7bfce | 2497 | int err; |
0741bcb5 | 2498 | |
9fe7bfce | 2499 | err = virtnet_restore_up(vdev); |
0741bcb5 AS |
2500 | if (err) |
2501 | return err; | |
986a4f4d JW |
2502 | virtnet_set_queues(vi, vi->curr_queue_pairs); |
2503 | ||
8017c279 | 2504 | err = virtnet_cpu_notif_add(vi); |
ec9debbd JW |
2505 | if (err) |
2506 | return err; | |
2507 | ||
0741bcb5 AS |
2508 | return 0; |
2509 | } | |
2510 | #endif | |
2511 | ||
296f96fc RR |
2512 | static struct virtio_device_id id_table[] = { |
2513 | { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, | |
2514 | { 0 }, | |
2515 | }; | |
2516 | ||
f3358507 MT |
2517 | #define VIRTNET_FEATURES \ |
2518 | VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ | |
2519 | VIRTIO_NET_F_MAC, \ | |
2520 | VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ | |
2521 | VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ | |
2522 | VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ | |
2523 | VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ | |
2524 | VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ | |
2525 | VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ | |
2526 | VIRTIO_NET_F_CTRL_MAC_ADDR, \ | |
2527 | VIRTIO_NET_F_MTU | |
2528 | ||
c45a6816 | 2529 | static unsigned int features[] = { |
f3358507 MT |
2530 | VIRTNET_FEATURES, |
2531 | }; | |
2532 | ||
2533 | static unsigned int features_legacy[] = { | |
2534 | VIRTNET_FEATURES, | |
2535 | VIRTIO_NET_F_GSO, | |
e7428e95 | 2536 | VIRTIO_F_ANY_LAYOUT, |
c45a6816 RR |
2537 | }; |
2538 | ||
22402529 | 2539 | static struct virtio_driver virtio_net_driver = { |
c45a6816 RR |
2540 | .feature_table = features, |
2541 | .feature_table_size = ARRAY_SIZE(features), | |
f3358507 MT |
2542 | .feature_table_legacy = features_legacy, |
2543 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), | |
296f96fc RR |
2544 | .driver.name = KBUILD_MODNAME, |
2545 | .driver.owner = THIS_MODULE, | |
2546 | .id_table = id_table, | |
2547 | .probe = virtnet_probe, | |
8cc085d6 | 2548 | .remove = virtnet_remove, |
9f4d26d0 | 2549 | .config_changed = virtnet_config_changed, |
89107000 | 2550 | #ifdef CONFIG_PM_SLEEP |
0741bcb5 AS |
2551 | .freeze = virtnet_freeze, |
2552 | .restore = virtnet_restore, | |
2553 | #endif | |
296f96fc RR |
2554 | }; |
2555 | ||
8017c279 SAS |
2556 | static __init int virtio_net_driver_init(void) |
2557 | { | |
2558 | int ret; | |
2559 | ||
73c1b41e | 2560 | ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", |
8017c279 SAS |
2561 | virtnet_cpu_online, |
2562 | virtnet_cpu_down_prep); | |
2563 | if (ret < 0) | |
2564 | goto out; | |
2565 | virtionet_online = ret; | |
73c1b41e | 2566 | ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", |
8017c279 SAS |
2567 | NULL, virtnet_cpu_dead); |
2568 | if (ret) | |
2569 | goto err_dead; | |
2570 | ||
2571 | ret = register_virtio_driver(&virtio_net_driver); | |
2572 | if (ret) | |
2573 | goto err_virtio; | |
2574 | return 0; | |
2575 | err_virtio: | |
2576 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); | |
2577 | err_dead: | |
2578 | cpuhp_remove_multi_state(virtionet_online); | |
2579 | out: | |
2580 | return ret; | |
2581 | } | |
2582 | module_init(virtio_net_driver_init); | |
2583 | ||
2584 | static __exit void virtio_net_driver_exit(void) | |
2585 | { | |
2586 | cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); | |
2587 | cpuhp_remove_multi_state(virtionet_online); | |
2588 | unregister_virtio_driver(&virtio_net_driver); | |
2589 | } | |
2590 | module_exit(virtio_net_driver_exit); | |
296f96fc RR |
2591 | |
2592 | MODULE_DEVICE_TABLE(virtio, id_table); | |
2593 | MODULE_DESCRIPTION("Virtio network driver"); | |
2594 | MODULE_LICENSE("GPL"); |