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7a338472 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3a4d5c94 MT |
2 | /* Copyright (C) 2009 Red Hat, Inc. |
3 | * Author: Michael S. Tsirkin <mst@redhat.com> | |
4 | * | |
3a4d5c94 MT |
5 | * virtio-net server in host kernel. |
6 | */ | |
7 | ||
8 | #include <linux/compat.h> | |
9 | #include <linux/eventfd.h> | |
10 | #include <linux/vhost.h> | |
11 | #include <linux/virtio_net.h> | |
3a4d5c94 MT |
12 | #include <linux/miscdevice.h> |
13 | #include <linux/module.h> | |
bab632d6 | 14 | #include <linux/moduleparam.h> |
3a4d5c94 MT |
15 | #include <linux/mutex.h> |
16 | #include <linux/workqueue.h> | |
3a4d5c94 | 17 | #include <linux/file.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e6017571 | 19 | #include <linux/sched/clock.h> |
174cd4b1 | 20 | #include <linux/sched/signal.h> |
23cc5a99 | 21 | #include <linux/vmalloc.h> |
3a4d5c94 MT |
22 | |
23 | #include <linux/net.h> | |
24 | #include <linux/if_packet.h> | |
25 | #include <linux/if_arp.h> | |
26 | #include <linux/if_tun.h> | |
501c774c | 27 | #include <linux/if_macvlan.h> |
635b8c8e | 28 | #include <linux/if_tap.h> |
c53cff5e | 29 | #include <linux/if_vlan.h> |
c67df11f JW |
30 | #include <linux/skb_array.h> |
31 | #include <linux/skbuff.h> | |
3a4d5c94 MT |
32 | |
33 | #include <net/sock.h> | |
1ffcbc85 | 34 | #include <net/xdp.h> |
3a4d5c94 MT |
35 | |
36 | #include "vhost.h" | |
37 | ||
098eadce | 38 | static int experimental_zcopytx = 0; |
bab632d6 | 39 | module_param(experimental_zcopytx, int, 0444); |
f9611c43 MT |
40 | MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;" |
41 | " 1 -Enable; 0 - Disable"); | |
bab632d6 | 42 | |
3a4d5c94 MT |
43 | /* Max number of bytes transferred before requeueing the job. |
44 | * Using this limit prevents one virtqueue from starving others. */ | |
45 | #define VHOST_NET_WEIGHT 0x80000 | |
46 | ||
a2ac9990 | 47 | /* Max number of packets transferred before requeueing the job. |
db688c24 PA |
48 | * Using this limit prevents one virtqueue from starving others with small |
49 | * pkts. | |
50 | */ | |
51 | #define VHOST_NET_PKT_WEIGHT 256 | |
a2ac9990 | 52 | |
bab632d6 MT |
53 | /* MAX number of TX used buffers for outstanding zerocopy */ |
54 | #define VHOST_MAX_PEND 128 | |
55 | #define VHOST_GOODCOPY_LEN 256 | |
56 | ||
eaae8132 MT |
57 | /* |
58 | * For transmit, used buffer len is unused; we override it to track buffer | |
59 | * status internally; used for zerocopy tx only. | |
60 | */ | |
61 | /* Lower device DMA failed */ | |
bf995734 | 62 | #define VHOST_DMA_FAILED_LEN ((__force __virtio32)3) |
eaae8132 | 63 | /* Lower device DMA done */ |
bf995734 | 64 | #define VHOST_DMA_DONE_LEN ((__force __virtio32)2) |
eaae8132 | 65 | /* Lower device DMA in progress */ |
bf995734 | 66 | #define VHOST_DMA_IN_PROGRESS ((__force __virtio32)1) |
eaae8132 | 67 | /* Buffer unused */ |
bf995734 | 68 | #define VHOST_DMA_CLEAR_LEN ((__force __virtio32)0) |
eaae8132 | 69 | |
bf995734 | 70 | #define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force u32)VHOST_DMA_DONE_LEN) |
eaae8132 | 71 | |
8570a6e7 AH |
72 | enum { |
73 | VHOST_NET_FEATURES = VHOST_FEATURES | | |
74 | (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) | | |
6b1e6cc7 JW |
75 | (1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
76 | (1ULL << VIRTIO_F_IOMMU_PLATFORM) | |
8570a6e7 AH |
77 | }; |
78 | ||
429711ae JW |
79 | enum { |
80 | VHOST_NET_BACKEND_FEATURES = (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2) | |
81 | }; | |
82 | ||
3a4d5c94 MT |
83 | enum { |
84 | VHOST_NET_VQ_RX = 0, | |
85 | VHOST_NET_VQ_TX = 1, | |
86 | VHOST_NET_VQ_MAX = 2, | |
87 | }; | |
88 | ||
fe729a57 | 89 | struct vhost_net_ubuf_ref { |
0ad8b480 MT |
90 | /* refcount follows semantics similar to kref: |
91 | * 0: object is released | |
92 | * 1: no outstanding ubufs | |
93 | * >1: outstanding ubufs | |
94 | */ | |
95 | atomic_t refcount; | |
2839400f AH |
96 | wait_queue_head_t wait; |
97 | struct vhost_virtqueue *vq; | |
98 | }; | |
99 | ||
d0d86971 | 100 | #define VHOST_NET_BATCH 64 |
c67df11f | 101 | struct vhost_net_buf { |
5990a305 | 102 | void **queue; |
c67df11f JW |
103 | int tail; |
104 | int head; | |
105 | }; | |
106 | ||
3ab2e420 AH |
107 | struct vhost_net_virtqueue { |
108 | struct vhost_virtqueue vq; | |
81f95a55 MT |
109 | size_t vhost_hlen; |
110 | size_t sock_hlen; | |
2839400f AH |
111 | /* vhost zerocopy support fields below: */ |
112 | /* last used idx for outstanding DMA zerocopy buffers */ | |
113 | int upend_idx; | |
f5a4941a JW |
114 | /* For TX, first used idx for DMA done zerocopy buffers |
115 | * For RX, number of batched heads | |
116 | */ | |
2839400f | 117 | int done_idx; |
0a0be13b JW |
118 | /* Number of XDP frames batched */ |
119 | int batched_xdp; | |
2839400f AH |
120 | /* an array of userspace buffers info */ |
121 | struct ubuf_info *ubuf_info; | |
122 | /* Reference counting for outstanding ubufs. | |
123 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 124 | struct vhost_net_ubuf_ref *ubufs; |
5990a305 | 125 | struct ptr_ring *rx_ring; |
c67df11f | 126 | struct vhost_net_buf rxq; |
0a0be13b JW |
127 | /* Batched XDP buffs */ |
128 | struct xdp_buff *xdp; | |
3ab2e420 AH |
129 | }; |
130 | ||
3a4d5c94 MT |
131 | struct vhost_net { |
132 | struct vhost_dev dev; | |
3ab2e420 | 133 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 134 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
135 | /* Number of TX recently submitted. |
136 | * Protected by tx vq lock. */ | |
137 | unsigned tx_packets; | |
138 | /* Number of times zerocopy TX recently failed. | |
139 | * Protected by tx vq lock. */ | |
140 | unsigned tx_zcopy_err; | |
1280c27f MT |
141 | /* Flush in progress. Protected by tx vq lock. */ |
142 | bool tx_flush; | |
e4dab1e6 JW |
143 | /* Private page frag */ |
144 | struct page_frag page_frag; | |
145 | /* Refcount bias of page frag */ | |
146 | int refcnt_bias; | |
3a4d5c94 MT |
147 | }; |
148 | ||
fe729a57 | 149 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 150 | |
c67df11f JW |
151 | static void *vhost_net_buf_get_ptr(struct vhost_net_buf *rxq) |
152 | { | |
153 | if (rxq->tail != rxq->head) | |
154 | return rxq->queue[rxq->head]; | |
155 | else | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | static int vhost_net_buf_get_size(struct vhost_net_buf *rxq) | |
160 | { | |
161 | return rxq->tail - rxq->head; | |
162 | } | |
163 | ||
164 | static int vhost_net_buf_is_empty(struct vhost_net_buf *rxq) | |
165 | { | |
166 | return rxq->tail == rxq->head; | |
167 | } | |
168 | ||
169 | static void *vhost_net_buf_consume(struct vhost_net_buf *rxq) | |
170 | { | |
171 | void *ret = vhost_net_buf_get_ptr(rxq); | |
172 | ++rxq->head; | |
173 | return ret; | |
174 | } | |
175 | ||
176 | static int vhost_net_buf_produce(struct vhost_net_virtqueue *nvq) | |
177 | { | |
178 | struct vhost_net_buf *rxq = &nvq->rxq; | |
179 | ||
180 | rxq->head = 0; | |
5990a305 | 181 | rxq->tail = ptr_ring_consume_batched(nvq->rx_ring, rxq->queue, |
d0d86971 | 182 | VHOST_NET_BATCH); |
c67df11f JW |
183 | return rxq->tail; |
184 | } | |
185 | ||
186 | static void vhost_net_buf_unproduce(struct vhost_net_virtqueue *nvq) | |
187 | { | |
188 | struct vhost_net_buf *rxq = &nvq->rxq; | |
189 | ||
5990a305 JW |
190 | if (nvq->rx_ring && !vhost_net_buf_is_empty(rxq)) { |
191 | ptr_ring_unconsume(nvq->rx_ring, rxq->queue + rxq->head, | |
192 | vhost_net_buf_get_size(rxq), | |
3a403076 | 193 | tun_ptr_free); |
c67df11f JW |
194 | rxq->head = rxq->tail = 0; |
195 | } | |
196 | } | |
197 | ||
fc72d1d5 JW |
198 | static int vhost_net_buf_peek_len(void *ptr) |
199 | { | |
1ffcbc85 JDB |
200 | if (tun_is_xdp_frame(ptr)) { |
201 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 202 | |
1ffcbc85 | 203 | return xdpf->len; |
fc72d1d5 JW |
204 | } |
205 | ||
206 | return __skb_array_len_with_tag(ptr); | |
207 | } | |
208 | ||
c67df11f JW |
209 | static int vhost_net_buf_peek(struct vhost_net_virtqueue *nvq) |
210 | { | |
211 | struct vhost_net_buf *rxq = &nvq->rxq; | |
212 | ||
213 | if (!vhost_net_buf_is_empty(rxq)) | |
214 | goto out; | |
215 | ||
216 | if (!vhost_net_buf_produce(nvq)) | |
217 | return 0; | |
218 | ||
219 | out: | |
fc72d1d5 | 220 | return vhost_net_buf_peek_len(vhost_net_buf_get_ptr(rxq)); |
c67df11f JW |
221 | } |
222 | ||
223 | static void vhost_net_buf_init(struct vhost_net_buf *rxq) | |
224 | { | |
225 | rxq->head = rxq->tail = 0; | |
226 | } | |
227 | ||
fe729a57 | 228 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 229 | { |
fe729a57 | 230 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
231 | } |
232 | ||
fe729a57 AH |
233 | static struct vhost_net_ubuf_ref * |
234 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 235 | { |
fe729a57 | 236 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
237 | /* No zero copy backend? Nothing to count. */ |
238 | if (!zcopy) | |
239 | return NULL; | |
240 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
241 | if (!ubufs) | |
242 | return ERR_PTR(-ENOMEM); | |
0ad8b480 | 243 | atomic_set(&ubufs->refcount, 1); |
2839400f AH |
244 | init_waitqueue_head(&ubufs->wait); |
245 | ubufs->vq = vq; | |
246 | return ubufs; | |
247 | } | |
248 | ||
0ad8b480 | 249 | static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 250 | { |
0ad8b480 MT |
251 | int r = atomic_sub_return(1, &ubufs->refcount); |
252 | if (unlikely(!r)) | |
253 | wake_up(&ubufs->wait); | |
254 | return r; | |
2839400f AH |
255 | } |
256 | ||
fe729a57 | 257 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 258 | { |
0ad8b480 MT |
259 | vhost_net_ubuf_put(ubufs); |
260 | wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); | |
c38e39c3 MT |
261 | } |
262 | ||
263 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
264 | { | |
265 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
266 | kfree(ubufs); |
267 | } | |
268 | ||
b1ad8496 AH |
269 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
270 | { | |
b1ad8496 AH |
271 | int i; |
272 | ||
288cfe78 MT |
273 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
274 | kfree(n->vqs[i].ubuf_info); | |
275 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
276 | } |
277 | } | |
278 | ||
0a1febf7 | 279 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
280 | { |
281 | bool zcopy; | |
282 | int i; | |
283 | ||
288cfe78 | 284 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 285 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
286 | if (!zcopy) |
287 | continue; | |
6da2ec56 KC |
288 | n->vqs[i].ubuf_info = |
289 | kmalloc_array(UIO_MAXIOV, | |
290 | sizeof(*n->vqs[i].ubuf_info), | |
291 | GFP_KERNEL); | |
2839400f AH |
292 | if (!n->vqs[i].ubuf_info) |
293 | goto err; | |
294 | } | |
295 | return 0; | |
296 | ||
297 | err: | |
288cfe78 | 298 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
299 | return -ENOMEM; |
300 | } | |
301 | ||
0a1febf7 | 302 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
303 | { |
304 | int i; | |
305 | ||
288cfe78 MT |
306 | vhost_net_clear_ubuf_info(n); |
307 | ||
2839400f AH |
308 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
309 | n->vqs[i].done_idx = 0; | |
310 | n->vqs[i].upend_idx = 0; | |
311 | n->vqs[i].ubufs = NULL; | |
81f95a55 MT |
312 | n->vqs[i].vhost_hlen = 0; |
313 | n->vqs[i].sock_hlen = 0; | |
c67df11f | 314 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f AH |
315 | } |
316 | ||
317 | } | |
318 | ||
eaae8132 MT |
319 | static void vhost_net_tx_packet(struct vhost_net *net) |
320 | { | |
321 | ++net->tx_packets; | |
322 | if (net->tx_packets < 1024) | |
323 | return; | |
324 | net->tx_packets = 0; | |
325 | net->tx_zcopy_err = 0; | |
326 | } | |
327 | ||
328 | static void vhost_net_tx_err(struct vhost_net *net) | |
329 | { | |
330 | ++net->tx_zcopy_err; | |
331 | } | |
332 | ||
333 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
334 | { | |
1280c27f MT |
335 | /* TX flush waits for outstanding DMAs to be done. |
336 | * Don't start new DMAs. | |
337 | */ | |
338 | return !net->tx_flush && | |
339 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
340 | } |
341 | ||
bab632d6 MT |
342 | static bool vhost_sock_zcopy(struct socket *sock) |
343 | { | |
344 | return unlikely(experimental_zcopytx) && | |
345 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
346 | } | |
347 | ||
0a0be13b JW |
348 | static bool vhost_sock_xdp(struct socket *sock) |
349 | { | |
350 | return sock_flag(sock->sk, SOCK_XDP); | |
351 | } | |
352 | ||
b211616d MT |
353 | /* In case of DMA done not in order in lower device driver for some reason. |
354 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
355 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
356 | * guest used idx. | |
357 | */ | |
094afe7d JW |
358 | static void vhost_zerocopy_signal_used(struct vhost_net *net, |
359 | struct vhost_virtqueue *vq) | |
b211616d | 360 | { |
2839400f AH |
361 | struct vhost_net_virtqueue *nvq = |
362 | container_of(vq, struct vhost_net_virtqueue, vq); | |
c92112ae | 363 | int i, add; |
b211616d MT |
364 | int j = 0; |
365 | ||
2839400f | 366 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
367 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
368 | vhost_net_tx_err(net); | |
b211616d MT |
369 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
370 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
b211616d MT |
371 | ++j; |
372 | } else | |
373 | break; | |
374 | } | |
c92112ae JW |
375 | while (j) { |
376 | add = min(UIO_MAXIOV - nvq->done_idx, j); | |
377 | vhost_add_used_and_signal_n(vq->dev, vq, | |
378 | &vq->heads[nvq->done_idx], add); | |
379 | nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; | |
380 | j -= add; | |
381 | } | |
b211616d MT |
382 | } |
383 | ||
eaae8132 | 384 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 385 | { |
fe729a57 | 386 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 387 | struct vhost_virtqueue *vq = ubufs->vq; |
0ad8b480 | 388 | int cnt; |
24eb21a1 | 389 | |
b0c057ca MT |
390 | rcu_read_lock_bh(); |
391 | ||
19c73b3e JW |
392 | /* set len to mark this desc buffers done DMA */ |
393 | vq->heads[ubuf->desc].len = success ? | |
394 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
0ad8b480 | 395 | cnt = vhost_net_ubuf_put(ubufs); |
19c73b3e | 396 | |
24eb21a1 MT |
397 | /* |
398 | * Trigger polling thread if guest stopped submitting new buffers: | |
0ad8b480 | 399 | * in this case, the refcount after decrement will eventually reach 1. |
24eb21a1 MT |
400 | * We also trigger polling periodically after each 16 packets |
401 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
402 | * less than 10% of times). | |
403 | */ | |
0ad8b480 | 404 | if (cnt <= 1 || !(cnt % 16)) |
24eb21a1 | 405 | vhost_poll_queue(&vq->poll); |
b0c057ca MT |
406 | |
407 | rcu_read_unlock_bh(); | |
b211616d MT |
408 | } |
409 | ||
03088137 JW |
410 | static inline unsigned long busy_clock(void) |
411 | { | |
412 | return local_clock() >> 10; | |
413 | } | |
414 | ||
027b1760 | 415 | static bool vhost_can_busy_poll(unsigned long endtime) |
03088137 | 416 | { |
027b1760 TM |
417 | return likely(!need_resched() && !time_after(busy_clock(), endtime) && |
418 | !signal_pending(current)); | |
03088137 JW |
419 | } |
420 | ||
8241a1e4 JW |
421 | static void vhost_net_disable_vq(struct vhost_net *n, |
422 | struct vhost_virtqueue *vq) | |
423 | { | |
424 | struct vhost_net_virtqueue *nvq = | |
425 | container_of(vq, struct vhost_net_virtqueue, vq); | |
426 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
247643f8 | 427 | if (!vhost_vq_get_backend(vq)) |
8241a1e4 JW |
428 | return; |
429 | vhost_poll_stop(poll); | |
430 | } | |
431 | ||
432 | static int vhost_net_enable_vq(struct vhost_net *n, | |
433 | struct vhost_virtqueue *vq) | |
434 | { | |
435 | struct vhost_net_virtqueue *nvq = | |
436 | container_of(vq, struct vhost_net_virtqueue, vq); | |
437 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
438 | struct socket *sock; | |
439 | ||
247643f8 | 440 | sock = vhost_vq_get_backend(vq); |
8241a1e4 JW |
441 | if (!sock) |
442 | return 0; | |
443 | ||
444 | return vhost_poll_start(poll, sock->file); | |
445 | } | |
446 | ||
4afb52c2 JW |
447 | static void vhost_net_signal_used(struct vhost_net_virtqueue *nvq) |
448 | { | |
449 | struct vhost_virtqueue *vq = &nvq->vq; | |
450 | struct vhost_dev *dev = vq->dev; | |
451 | ||
452 | if (!nvq->done_idx) | |
453 | return; | |
454 | ||
455 | vhost_add_used_and_signal_n(dev, vq, vq->heads, nvq->done_idx); | |
456 | nvq->done_idx = 0; | |
457 | } | |
458 | ||
0a0be13b JW |
459 | static void vhost_tx_batch(struct vhost_net *net, |
460 | struct vhost_net_virtqueue *nvq, | |
461 | struct socket *sock, | |
462 | struct msghdr *msghdr) | |
463 | { | |
464 | struct tun_msg_ctl ctl = { | |
465 | .type = TUN_MSG_PTR, | |
466 | .num = nvq->batched_xdp, | |
467 | .ptr = nvq->xdp, | |
468 | }; | |
469 | int err; | |
470 | ||
471 | if (nvq->batched_xdp == 0) | |
472 | goto signal_used; | |
473 | ||
474 | msghdr->msg_control = &ctl; | |
475 | err = sock->ops->sendmsg(sock, msghdr, 0); | |
476 | if (unlikely(err < 0)) { | |
477 | vq_err(&nvq->vq, "Fail to batch sending packets\n"); | |
478 | return; | |
479 | } | |
480 | ||
481 | signal_used: | |
482 | vhost_net_signal_used(nvq); | |
483 | nvq->batched_xdp = 0; | |
484 | } | |
485 | ||
dc151282 TZ |
486 | static int sock_has_rx_data(struct socket *sock) |
487 | { | |
488 | if (unlikely(!sock)) | |
489 | return 0; | |
490 | ||
491 | if (sock->ops->peek_len) | |
492 | return sock->ops->peek_len(sock); | |
493 | ||
494 | return skb_queue_empty(&sock->sk->sk_receive_queue); | |
495 | } | |
496 | ||
497 | static void vhost_net_busy_poll_try_queue(struct vhost_net *net, | |
498 | struct vhost_virtqueue *vq) | |
499 | { | |
500 | if (!vhost_vq_avail_empty(&net->dev, vq)) { | |
501 | vhost_poll_queue(&vq->poll); | |
502 | } else if (unlikely(vhost_enable_notify(&net->dev, vq))) { | |
503 | vhost_disable_notify(&net->dev, vq); | |
504 | vhost_poll_queue(&vq->poll); | |
505 | } | |
506 | } | |
507 | ||
508 | static void vhost_net_busy_poll(struct vhost_net *net, | |
509 | struct vhost_virtqueue *rvq, | |
510 | struct vhost_virtqueue *tvq, | |
511 | bool *busyloop_intr, | |
512 | bool poll_rx) | |
513 | { | |
514 | unsigned long busyloop_timeout; | |
515 | unsigned long endtime; | |
516 | struct socket *sock; | |
517 | struct vhost_virtqueue *vq = poll_rx ? tvq : rvq; | |
518 | ||
476e8ba7 JW |
519 | /* Try to hold the vq mutex of the paired virtqueue. We can't |
520 | * use mutex_lock() here since we could not guarantee a | |
521 | * consistenet lock ordering. | |
522 | */ | |
523 | if (!mutex_trylock(&vq->mutex)) | |
524 | return; | |
525 | ||
dc151282 | 526 | vhost_disable_notify(&net->dev, vq); |
247643f8 | 527 | sock = vhost_vq_get_backend(rvq); |
dc151282 TZ |
528 | |
529 | busyloop_timeout = poll_rx ? rvq->busyloop_timeout: | |
530 | tvq->busyloop_timeout; | |
531 | ||
532 | preempt_disable(); | |
533 | endtime = busy_clock() + busyloop_timeout; | |
534 | ||
535 | while (vhost_can_busy_poll(endtime)) { | |
536 | if (vhost_has_work(&net->dev)) { | |
537 | *busyloop_intr = true; | |
538 | break; | |
539 | } | |
540 | ||
541 | if ((sock_has_rx_data(sock) && | |
542 | !vhost_vq_avail_empty(&net->dev, rvq)) || | |
543 | !vhost_vq_avail_empty(&net->dev, tvq)) | |
544 | break; | |
545 | ||
546 | cpu_relax(); | |
547 | } | |
548 | ||
549 | preempt_enable(); | |
550 | ||
551 | if (poll_rx || sock_has_rx_data(sock)) | |
552 | vhost_net_busy_poll_try_queue(net, vq); | |
553 | else if (!poll_rx) /* On tx here, sock has no rx data. */ | |
554 | vhost_enable_notify(&net->dev, rvq); | |
555 | ||
556 | mutex_unlock(&vq->mutex); | |
557 | } | |
558 | ||
03088137 | 559 | static int vhost_net_tx_get_vq_desc(struct vhost_net *net, |
441abde4 | 560 | struct vhost_net_virtqueue *tnvq, |
027b1760 | 561 | unsigned int *out_num, unsigned int *in_num, |
0a0be13b | 562 | struct msghdr *msghdr, bool *busyloop_intr) |
03088137 | 563 | { |
441abde4 TZ |
564 | struct vhost_net_virtqueue *rnvq = &net->vqs[VHOST_NET_VQ_RX]; |
565 | struct vhost_virtqueue *rvq = &rnvq->vq; | |
566 | struct vhost_virtqueue *tvq = &tnvq->vq; | |
567 | ||
568 | int r = vhost_get_vq_desc(tvq, tvq->iov, ARRAY_SIZE(tvq->iov), | |
6b1e6cc7 | 569 | out_num, in_num, NULL, NULL); |
03088137 | 570 | |
441abde4 | 571 | if (r == tvq->num && tvq->busyloop_timeout) { |
0a0be13b | 572 | /* Flush batched packets first */ |
247643f8 EP |
573 | if (!vhost_sock_zcopy(vhost_vq_get_backend(tvq))) |
574 | vhost_tx_batch(net, tnvq, | |
575 | vhost_vq_get_backend(tvq), | |
576 | msghdr); | |
441abde4 TZ |
577 | |
578 | vhost_net_busy_poll(net, rvq, tvq, busyloop_intr, false); | |
579 | ||
580 | r = vhost_get_vq_desc(tvq, tvq->iov, ARRAY_SIZE(tvq->iov), | |
6b1e6cc7 | 581 | out_num, in_num, NULL, NULL); |
03088137 JW |
582 | } |
583 | ||
584 | return r; | |
585 | } | |
586 | ||
0ed005ce JW |
587 | static bool vhost_exceeds_maxpend(struct vhost_net *net) |
588 | { | |
589 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
590 | struct vhost_virtqueue *vq = &nvq->vq; | |
591 | ||
1e6f7453 WB |
592 | return (nvq->upend_idx + UIO_MAXIOV - nvq->done_idx) % UIO_MAXIOV > |
593 | min_t(unsigned int, VHOST_MAX_PEND, vq->num >> 2); | |
0ed005ce JW |
594 | } |
595 | ||
b0d0ea50 JW |
596 | static size_t init_iov_iter(struct vhost_virtqueue *vq, struct iov_iter *iter, |
597 | size_t hdr_size, int out) | |
598 | { | |
599 | /* Skip header. TODO: support TSO. */ | |
600 | size_t len = iov_length(vq->iov, out); | |
601 | ||
602 | iov_iter_init(iter, WRITE, vq->iov, out, len); | |
603 | iov_iter_advance(iter, hdr_size); | |
604 | ||
605 | return iov_iter_count(iter); | |
606 | } | |
607 | ||
a2a91a13 JW |
608 | static int get_tx_bufs(struct vhost_net *net, |
609 | struct vhost_net_virtqueue *nvq, | |
610 | struct msghdr *msg, | |
611 | unsigned int *out, unsigned int *in, | |
612 | size_t *len, bool *busyloop_intr) | |
613 | { | |
614 | struct vhost_virtqueue *vq = &nvq->vq; | |
615 | int ret; | |
616 | ||
0a0be13b | 617 | ret = vhost_net_tx_get_vq_desc(net, nvq, out, in, msg, busyloop_intr); |
4afb52c2 | 618 | |
a2a91a13 JW |
619 | if (ret < 0 || ret == vq->num) |
620 | return ret; | |
621 | ||
622 | if (*in) { | |
623 | vq_err(vq, "Unexpected descriptor format for TX: out %d, int %d\n", | |
624 | *out, *in); | |
625 | return -EFAULT; | |
626 | } | |
627 | ||
628 | /* Sanity check */ | |
629 | *len = init_iov_iter(vq, &msg->msg_iter, nvq->vhost_hlen, *out); | |
630 | if (*len == 0) { | |
631 | vq_err(vq, "Unexpected header len for TX: %zd expected %zd\n", | |
632 | *len, nvq->vhost_hlen); | |
633 | return -EFAULT; | |
634 | } | |
635 | ||
636 | return ret; | |
637 | } | |
638 | ||
c92a8a8c JW |
639 | static bool tx_can_batch(struct vhost_virtqueue *vq, size_t total_len) |
640 | { | |
641 | return total_len < VHOST_NET_WEIGHT && | |
642 | !vhost_vq_avail_empty(vq->dev, vq); | |
643 | } | |
644 | ||
e4dab1e6 JW |
645 | #define SKB_FRAG_PAGE_ORDER get_order(32768) |
646 | ||
647 | static bool vhost_net_page_frag_refill(struct vhost_net *net, unsigned int sz, | |
648 | struct page_frag *pfrag, gfp_t gfp) | |
649 | { | |
650 | if (pfrag->page) { | |
651 | if (pfrag->offset + sz <= pfrag->size) | |
652 | return true; | |
653 | __page_frag_cache_drain(pfrag->page, net->refcnt_bias); | |
654 | } | |
655 | ||
656 | pfrag->offset = 0; | |
657 | net->refcnt_bias = 0; | |
658 | if (SKB_FRAG_PAGE_ORDER) { | |
659 | /* Avoid direct reclaim but allow kswapd to wake */ | |
660 | pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | | |
661 | __GFP_COMP | __GFP_NOWARN | | |
662 | __GFP_NORETRY, | |
663 | SKB_FRAG_PAGE_ORDER); | |
664 | if (likely(pfrag->page)) { | |
665 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; | |
666 | goto done; | |
667 | } | |
668 | } | |
669 | pfrag->page = alloc_page(gfp); | |
670 | if (likely(pfrag->page)) { | |
671 | pfrag->size = PAGE_SIZE; | |
672 | goto done; | |
673 | } | |
674 | return false; | |
675 | ||
676 | done: | |
677 | net->refcnt_bias = USHRT_MAX; | |
678 | page_ref_add(pfrag->page, USHRT_MAX - 1); | |
679 | return true; | |
680 | } | |
681 | ||
0a0be13b JW |
682 | #define VHOST_NET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
683 | ||
684 | static int vhost_net_build_xdp(struct vhost_net_virtqueue *nvq, | |
685 | struct iov_iter *from) | |
686 | { | |
687 | struct vhost_virtqueue *vq = &nvq->vq; | |
e4dab1e6 JW |
688 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, |
689 | dev); | |
247643f8 | 690 | struct socket *sock = vhost_vq_get_backend(vq); |
e4dab1e6 | 691 | struct page_frag *alloc_frag = &net->page_frag; |
0a0be13b JW |
692 | struct virtio_net_hdr *gso; |
693 | struct xdp_buff *xdp = &nvq->xdp[nvq->batched_xdp]; | |
694 | struct tun_xdp_hdr *hdr; | |
695 | size_t len = iov_iter_count(from); | |
696 | int headroom = vhost_sock_xdp(sock) ? XDP_PACKET_HEADROOM : 0; | |
697 | int buflen = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
698 | int pad = SKB_DATA_ALIGN(VHOST_NET_RX_PAD + headroom + nvq->sock_hlen); | |
699 | int sock_hlen = nvq->sock_hlen; | |
700 | void *buf; | |
701 | int copied; | |
702 | ||
703 | if (unlikely(len < nvq->sock_hlen)) | |
704 | return -EFAULT; | |
705 | ||
706 | if (SKB_DATA_ALIGN(len + pad) + | |
707 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) > PAGE_SIZE) | |
708 | return -ENOSPC; | |
709 | ||
710 | buflen += SKB_DATA_ALIGN(len + pad); | |
711 | alloc_frag->offset = ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES); | |
e4dab1e6 JW |
712 | if (unlikely(!vhost_net_page_frag_refill(net, buflen, |
713 | alloc_frag, GFP_KERNEL))) | |
0a0be13b JW |
714 | return -ENOMEM; |
715 | ||
716 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; | |
717 | copied = copy_page_from_iter(alloc_frag->page, | |
718 | alloc_frag->offset + | |
719 | offsetof(struct tun_xdp_hdr, gso), | |
720 | sock_hlen, from); | |
721 | if (copied != sock_hlen) | |
722 | return -EFAULT; | |
723 | ||
724 | hdr = buf; | |
725 | gso = &hdr->gso; | |
726 | ||
727 | if ((gso->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
728 | vhost16_to_cpu(vq, gso->csum_start) + | |
729 | vhost16_to_cpu(vq, gso->csum_offset) + 2 > | |
730 | vhost16_to_cpu(vq, gso->hdr_len)) { | |
731 | gso->hdr_len = cpu_to_vhost16(vq, | |
732 | vhost16_to_cpu(vq, gso->csum_start) + | |
733 | vhost16_to_cpu(vq, gso->csum_offset) + 2); | |
734 | ||
735 | if (vhost16_to_cpu(vq, gso->hdr_len) > len) | |
736 | return -EINVAL; | |
737 | } | |
738 | ||
739 | len -= sock_hlen; | |
740 | copied = copy_page_from_iter(alloc_frag->page, | |
741 | alloc_frag->offset + pad, | |
742 | len, from); | |
743 | if (copied != len) | |
744 | return -EFAULT; | |
745 | ||
746 | xdp->data_hard_start = buf; | |
747 | xdp->data = buf + pad; | |
748 | xdp->data_end = xdp->data + len; | |
749 | hdr->buflen = buflen; | |
750 | ||
e4dab1e6 | 751 | --net->refcnt_bias; |
0a0be13b JW |
752 | alloc_frag->offset += buflen; |
753 | ||
754 | ++nvq->batched_xdp; | |
755 | ||
756 | return 0; | |
757 | } | |
758 | ||
0d20bdf3 | 759 | static void handle_tx_copy(struct vhost_net *net, struct socket *sock) |
3a4d5c94 | 760 | { |
2839400f | 761 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 762 | struct vhost_virtqueue *vq = &nvq->vq; |
98a527aa | 763 | unsigned out, in; |
d5675bd2 | 764 | int head; |
3a4d5c94 MT |
765 | struct msghdr msg = { |
766 | .msg_name = NULL, | |
767 | .msg_namelen = 0, | |
768 | .msg_control = NULL, | |
769 | .msg_controllen = 0, | |
3a4d5c94 MT |
770 | .msg_flags = MSG_DONTWAIT, |
771 | }; | |
772 | size_t len, total_len = 0; | |
70181d51 | 773 | int err; |
a2ac9990 | 774 | int sent_pkts = 0; |
0a0be13b | 775 | bool sock_can_batch = (sock->sk->sk_sndbuf == INT_MAX); |
28457ee6 | 776 | |
e2412c07 | 777 | do { |
0d20bdf3 | 778 | bool busyloop_intr = false; |
3a4d5c94 | 779 | |
0a0be13b JW |
780 | if (nvq->done_idx == VHOST_NET_BATCH) |
781 | vhost_tx_batch(net, nvq, sock, &msg); | |
782 | ||
0d20bdf3 JW |
783 | head = get_tx_bufs(net, nvq, &msg, &out, &in, &len, |
784 | &busyloop_intr); | |
785 | /* On error, stop handling until the next kick. */ | |
786 | if (unlikely(head < 0)) | |
787 | break; | |
788 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
789 | if (head == vq->num) { | |
790 | if (unlikely(busyloop_intr)) { | |
791 | vhost_poll_queue(&vq->poll); | |
792 | } else if (unlikely(vhost_enable_notify(&net->dev, | |
793 | vq))) { | |
794 | vhost_disable_notify(&net->dev, vq); | |
795 | continue; | |
796 | } | |
797 | break; | |
798 | } | |
6b1e6cc7 | 799 | |
0d20bdf3 | 800 | total_len += len; |
0a0be13b JW |
801 | |
802 | /* For simplicity, TX batching is only enabled if | |
803 | * sndbuf is unlimited. | |
804 | */ | |
805 | if (sock_can_batch) { | |
806 | err = vhost_net_build_xdp(nvq, &msg.msg_iter); | |
807 | if (!err) { | |
808 | goto done; | |
809 | } else if (unlikely(err != -ENOSPC)) { | |
810 | vhost_tx_batch(net, nvq, sock, &msg); | |
811 | vhost_discard_vq_desc(vq, 1); | |
812 | vhost_net_enable_vq(net, vq); | |
813 | break; | |
814 | } | |
815 | ||
816 | /* We can't build XDP buff, go for single | |
817 | * packet path but let's flush batched | |
818 | * packets. | |
819 | */ | |
820 | vhost_tx_batch(net, nvq, sock, &msg); | |
821 | msg.msg_control = NULL; | |
822 | } else { | |
823 | if (tx_can_batch(vq, total_len)) | |
824 | msg.msg_flags |= MSG_MORE; | |
825 | else | |
826 | msg.msg_flags &= ~MSG_MORE; | |
827 | } | |
0d20bdf3 JW |
828 | |
829 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ | |
830 | err = sock->ops->sendmsg(sock, &msg, len); | |
831 | if (unlikely(err < 0)) { | |
832 | vhost_discard_vq_desc(vq, 1); | |
833 | vhost_net_enable_vq(net, vq); | |
834 | break; | |
835 | } | |
836 | if (err != len) | |
837 | pr_debug("Truncated TX packet: len %d != %zd\n", | |
838 | err, len); | |
0a0be13b JW |
839 | done: |
840 | vq->heads[nvq->done_idx].id = cpu_to_vhost32(vq, head); | |
841 | vq->heads[nvq->done_idx].len = 0; | |
842 | ++nvq->done_idx; | |
e2412c07 | 843 | } while (likely(!vhost_exceeds_weight(vq, ++sent_pkts, total_len))); |
4afb52c2 | 844 | |
0a0be13b | 845 | vhost_tx_batch(net, nvq, sock, &msg); |
0d20bdf3 | 846 | } |
3a4d5c94 | 847 | |
0d20bdf3 JW |
848 | static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock) |
849 | { | |
850 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
851 | struct vhost_virtqueue *vq = &nvq->vq; | |
852 | unsigned out, in; | |
853 | int head; | |
854 | struct msghdr msg = { | |
855 | .msg_name = NULL, | |
856 | .msg_namelen = 0, | |
857 | .msg_control = NULL, | |
858 | .msg_controllen = 0, | |
859 | .msg_flags = MSG_DONTWAIT, | |
860 | }; | |
fe8dd45b | 861 | struct tun_msg_ctl ctl; |
0d20bdf3 JW |
862 | size_t len, total_len = 0; |
863 | int err; | |
864 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); | |
865 | bool zcopy_used; | |
866 | int sent_pkts = 0; | |
3a4d5c94 | 867 | |
e2412c07 | 868 | do { |
027b1760 TM |
869 | bool busyloop_intr; |
870 | ||
bab632d6 | 871 | /* Release DMAs done buffers first */ |
0d20bdf3 | 872 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 873 | |
027b1760 | 874 | busyloop_intr = false; |
a2a91a13 JW |
875 | head = get_tx_bufs(net, nvq, &msg, &out, &in, &len, |
876 | &busyloop_intr); | |
d5675bd2 | 877 | /* On error, stop handling until the next kick. */ |
7b3384fc | 878 | if (unlikely(head < 0)) |
d5675bd2 | 879 | break; |
3a4d5c94 MT |
880 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
881 | if (head == vq->num) { | |
027b1760 TM |
882 | if (unlikely(busyloop_intr)) { |
883 | vhost_poll_queue(&vq->poll); | |
884 | } else if (unlikely(vhost_enable_notify(&net->dev, vq))) { | |
8ea8cf89 | 885 | vhost_disable_notify(&net->dev, vq); |
3a4d5c94 MT |
886 | continue; |
887 | } | |
888 | break; | |
889 | } | |
ce21a029 | 890 | |
0d20bdf3 JW |
891 | zcopy_used = len >= VHOST_GOODCOPY_LEN |
892 | && !vhost_exceeds_maxpend(net) | |
893 | && vhost_net_tx_select_zcopy(net); | |
cedb9bdc | 894 | |
bab632d6 | 895 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 896 | if (zcopy_used) { |
ce21a029 JW |
897 | struct ubuf_info *ubuf; |
898 | ubuf = nvq->ubuf_info + nvq->upend_idx; | |
899 | ||
8b38694a | 900 | vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); |
ce21a029 JW |
901 | vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; |
902 | ubuf->callback = vhost_zerocopy_callback; | |
903 | ubuf->ctx = nvq->ubufs; | |
904 | ubuf->desc = nvq->upend_idx; | |
c1d1b437 | 905 | refcount_set(&ubuf->refcnt, 1); |
fe8dd45b JW |
906 | msg.msg_control = &ctl; |
907 | ctl.type = TUN_MSG_UBUF; | |
908 | ctl.ptr = ubuf; | |
909 | msg.msg_controllen = sizeof(ctl); | |
ce21a029 | 910 | ubufs = nvq->ubufs; |
0ad8b480 | 911 | atomic_inc(&ubufs->refcount); |
2839400f | 912 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
ce21a029 | 913 | } else { |
4364d5f9 | 914 | msg.msg_control = NULL; |
ce21a029 JW |
915 | ubufs = NULL; |
916 | } | |
0ed005ce | 917 | total_len += len; |
c92a8a8c | 918 | if (tx_can_batch(vq, total_len) && |
0ed005ce JW |
919 | likely(!vhost_exceeds_maxpend(net))) { |
920 | msg.msg_flags |= MSG_MORE; | |
921 | } else { | |
922 | msg.msg_flags &= ~MSG_MORE; | |
923 | } | |
924 | ||
3a4d5c94 | 925 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
1b784140 | 926 | err = sock->ops->sendmsg(sock, &msg, len); |
3a4d5c94 | 927 | if (unlikely(err < 0)) { |
cedb9bdc | 928 | if (zcopy_used) { |
ce21a029 | 929 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
930 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
931 | % UIO_MAXIOV; | |
bab632d6 | 932 | } |
8dd014ad | 933 | vhost_discard_vq_desc(vq, 1); |
feb8892c | 934 | vhost_net_enable_vq(net, vq); |
3a4d5c94 MT |
935 | break; |
936 | } | |
937 | if (err != len) | |
95c0ec6a MT |
938 | pr_debug("Truncated TX packet: " |
939 | " len %d != %zd\n", err, len); | |
cedb9bdc | 940 | if (!zcopy_used) |
bab632d6 | 941 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 942 | else |
eaae8132 | 943 | vhost_zerocopy_signal_used(net, vq); |
eaae8132 | 944 | vhost_net_tx_packet(net); |
e2412c07 | 945 | } while (likely(!vhost_exceeds_weight(vq, ++sent_pkts, total_len))); |
0d20bdf3 JW |
946 | } |
947 | ||
948 | /* Expects to be always run from workqueue - which acts as | |
949 | * read-size critical section for our kind of RCU. */ | |
950 | static void handle_tx(struct vhost_net *net) | |
951 | { | |
952 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
953 | struct vhost_virtqueue *vq = &nvq->vq; | |
954 | struct socket *sock; | |
955 | ||
a6a67a2f | 956 | mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_TX); |
247643f8 | 957 | sock = vhost_vq_get_backend(vq); |
0d20bdf3 JW |
958 | if (!sock) |
959 | goto out; | |
960 | ||
9b5e830b | 961 | if (!vq_meta_prefetch(vq)) |
0d20bdf3 JW |
962 | goto out; |
963 | ||
964 | vhost_disable_notify(&net->dev, vq); | |
965 | vhost_net_disable_vq(net, vq); | |
966 | ||
967 | if (vhost_sock_zcopy(sock)) | |
968 | handle_tx_zerocopy(net, sock); | |
969 | else | |
970 | handle_tx_copy(net, sock); | |
971 | ||
2e26af79 | 972 | out: |
3a4d5c94 | 973 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
974 | } |
975 | ||
c67df11f | 976 | static int peek_head_len(struct vhost_net_virtqueue *rvq, struct sock *sk) |
8dd014ad DS |
977 | { |
978 | struct sk_buff *head; | |
979 | int len = 0; | |
783e3988 | 980 | unsigned long flags; |
8dd014ad | 981 | |
5990a305 | 982 | if (rvq->rx_ring) |
c67df11f | 983 | return vhost_net_buf_peek(rvq); |
1576d986 | 984 | |
783e3988 | 985 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 986 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 987 | if (likely(head)) { |
8dd014ad | 988 | len = head->len; |
df8a39de | 989 | if (skb_vlan_tag_present(head)) |
c53cff5e BG |
990 | len += VLAN_HLEN; |
991 | } | |
992 | ||
783e3988 | 993 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
994 | return len; |
995 | } | |
996 | ||
be294a51 TM |
997 | static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk, |
998 | bool *busyloop_intr) | |
03088137 | 999 | { |
28b9b33b TM |
1000 | struct vhost_net_virtqueue *rnvq = &net->vqs[VHOST_NET_VQ_RX]; |
1001 | struct vhost_net_virtqueue *tnvq = &net->vqs[VHOST_NET_VQ_TX]; | |
6369fec5 | 1002 | struct vhost_virtqueue *rvq = &rnvq->vq; |
28b9b33b | 1003 | struct vhost_virtqueue *tvq = &tnvq->vq; |
28b9b33b | 1004 | int len = peek_head_len(rnvq, sk); |
03088137 | 1005 | |
dc151282 | 1006 | if (!len && rvq->busyloop_timeout) { |
f5a4941a | 1007 | /* Flush batched heads first */ |
09c32489 | 1008 | vhost_net_signal_used(rnvq); |
03088137 | 1009 | /* Both tx vq and rx socket were polled here */ |
dc151282 | 1010 | vhost_net_busy_poll(net, rvq, tvq, busyloop_intr, true); |
03088137 | 1011 | |
28b9b33b | 1012 | len = peek_head_len(rnvq, sk); |
03088137 JW |
1013 | } |
1014 | ||
1015 | return len; | |
1016 | } | |
1017 | ||
8dd014ad DS |
1018 | /* This is a multi-buffer version of vhost_get_desc, that works if |
1019 | * vq has read descriptors only. | |
1020 | * @vq - the relevant virtqueue | |
1021 | * @datalen - data length we'll be reading | |
1022 | * @iovcount - returned count of io vectors we fill | |
1023 | * @log - vhost log | |
1024 | * @log_num - log offset | |
94249369 | 1025 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
1026 | * returns number of buffer heads allocated, negative on error |
1027 | */ | |
1028 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
1029 | struct vring_used_elem *heads, | |
1030 | int datalen, | |
1031 | unsigned *iovcount, | |
1032 | struct vhost_log *log, | |
94249369 JW |
1033 | unsigned *log_num, |
1034 | unsigned int quota) | |
8dd014ad DS |
1035 | { |
1036 | unsigned int out, in; | |
1037 | int seg = 0; | |
1038 | int headcount = 0; | |
1039 | unsigned d; | |
1040 | int r, nlogs = 0; | |
8b38694a MT |
1041 | /* len is always initialized before use since we are always called with |
1042 | * datalen > 0. | |
1043 | */ | |
1044 | u32 uninitialized_var(len); | |
8dd014ad | 1045 | |
94249369 | 1046 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 1047 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
1048 | r = -ENOBUFS; |
1049 | goto err; | |
1050 | } | |
47283bef | 1051 | r = vhost_get_vq_desc(vq, vq->iov + seg, |
8dd014ad DS |
1052 | ARRAY_SIZE(vq->iov) - seg, &out, |
1053 | &in, log, log_num); | |
a39ee449 MT |
1054 | if (unlikely(r < 0)) |
1055 | goto err; | |
1056 | ||
1057 | d = r; | |
8dd014ad DS |
1058 | if (d == vq->num) { |
1059 | r = 0; | |
1060 | goto err; | |
1061 | } | |
1062 | if (unlikely(out || in <= 0)) { | |
1063 | vq_err(vq, "unexpected descriptor format for RX: " | |
1064 | "out %d, in %d\n", out, in); | |
1065 | r = -EINVAL; | |
1066 | goto err; | |
1067 | } | |
1068 | if (unlikely(log)) { | |
1069 | nlogs += *log_num; | |
1070 | log += *log_num; | |
1071 | } | |
8b38694a MT |
1072 | heads[headcount].id = cpu_to_vhost32(vq, d); |
1073 | len = iov_length(vq->iov + seg, in); | |
1074 | heads[headcount].len = cpu_to_vhost32(vq, len); | |
1075 | datalen -= len; | |
8dd014ad DS |
1076 | ++headcount; |
1077 | seg += in; | |
1078 | } | |
99975cc6 | 1079 | heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); |
8dd014ad DS |
1080 | *iovcount = seg; |
1081 | if (unlikely(log)) | |
1082 | *log_num = nlogs; | |
d8316f39 MT |
1083 | |
1084 | /* Detect overrun */ | |
1085 | if (unlikely(datalen > 0)) { | |
1086 | r = UIO_MAXIOV + 1; | |
1087 | goto err; | |
1088 | } | |
8dd014ad DS |
1089 | return headcount; |
1090 | err: | |
1091 | vhost_discard_vq_desc(vq, headcount); | |
1092 | return r; | |
1093 | } | |
1094 | ||
3a4d5c94 MT |
1095 | /* Expects to be always run from workqueue - which acts as |
1096 | * read-size critical section for our kind of RCU. */ | |
94249369 | 1097 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 1098 | { |
81f95a55 MT |
1099 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
1100 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
1101 | unsigned uninitialized_var(in), log; |
1102 | struct vhost_log *vq_log; | |
1103 | struct msghdr msg = { | |
1104 | .msg_name = NULL, | |
1105 | .msg_namelen = 0, | |
1106 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
1107 | .msg_controllen = 0, | |
8dd014ad DS |
1108 | .msg_flags = MSG_DONTWAIT, |
1109 | }; | |
0960b641 JW |
1110 | struct virtio_net_hdr hdr = { |
1111 | .flags = 0, | |
1112 | .gso_type = VIRTIO_NET_HDR_GSO_NONE | |
8dd014ad | 1113 | }; |
8dd014ad | 1114 | size_t total_len = 0; |
910a578f | 1115 | int err, mergeable; |
f5a4941a | 1116 | s16 headcount; |
8dd014ad DS |
1117 | size_t vhost_hlen, sock_hlen; |
1118 | size_t vhost_len, sock_len; | |
be294a51 | 1119 | bool busyloop_intr = false; |
2e26af79 | 1120 | struct socket *sock; |
ba7438ae | 1121 | struct iov_iter fixup; |
0960b641 | 1122 | __virtio16 num_buffers; |
db688c24 | 1123 | int recv_pkts = 0; |
8dd014ad | 1124 | |
a6a67a2f | 1125 | mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_RX); |
247643f8 | 1126 | sock = vhost_vq_get_backend(vq); |
2e26af79 AH |
1127 | if (!sock) |
1128 | goto out; | |
6b1e6cc7 | 1129 | |
9b5e830b | 1130 | if (!vq_meta_prefetch(vq)) |
6b1e6cc7 JW |
1131 | goto out; |
1132 | ||
8ea8cf89 | 1133 | vhost_disable_notify(&net->dev, vq); |
8241a1e4 | 1134 | vhost_net_disable_vq(net, vq); |
2e26af79 | 1135 | |
81f95a55 MT |
1136 | vhost_hlen = nvq->vhost_hlen; |
1137 | sock_hlen = nvq->sock_hlen; | |
8dd014ad | 1138 | |
ea16c514 | 1139 | vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ? |
8dd014ad | 1140 | vq->log : NULL; |
ea16c514 | 1141 | mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad | 1142 | |
e2412c07 JW |
1143 | do { |
1144 | sock_len = vhost_net_rx_peek_head_len(net, sock->sk, | |
1145 | &busyloop_intr); | |
1146 | if (!sock_len) | |
1147 | break; | |
8dd014ad DS |
1148 | sock_len += sock_hlen; |
1149 | vhost_len = sock_len + vhost_hlen; | |
f5a4941a JW |
1150 | headcount = get_rx_bufs(vq, vq->heads + nvq->done_idx, |
1151 | vhost_len, &in, vq_log, &log, | |
94249369 | 1152 | likely(mergeable) ? UIO_MAXIOV : 1); |
8dd014ad DS |
1153 | /* On error, stop handling until the next kick. */ |
1154 | if (unlikely(headcount < 0)) | |
8241a1e4 | 1155 | goto out; |
8dd014ad DS |
1156 | /* OK, now we need to know about added descriptors. */ |
1157 | if (!headcount) { | |
6369fec5 TM |
1158 | if (unlikely(busyloop_intr)) { |
1159 | vhost_poll_queue(&vq->poll); | |
1160 | } else if (unlikely(vhost_enable_notify(&net->dev, vq))) { | |
8dd014ad DS |
1161 | /* They have slipped one in as we were |
1162 | * doing that: check again. */ | |
8ea8cf89 | 1163 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
1164 | continue; |
1165 | } | |
1166 | /* Nothing new? Wait for eventfd to tell us | |
1167 | * they refilled. */ | |
8241a1e4 | 1168 | goto out; |
8dd014ad | 1169 | } |
6369fec5 | 1170 | busyloop_intr = false; |
5990a305 | 1171 | if (nvq->rx_ring) |
6e474083 WX |
1172 | msg.msg_control = vhost_net_buf_consume(&nvq->rxq); |
1173 | /* On overrun, truncate and discard */ | |
1174 | if (unlikely(headcount > UIO_MAXIOV)) { | |
1175 | iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); | |
1176 | err = sock->ops->recvmsg(sock, &msg, | |
1177 | 1, MSG_DONTWAIT | MSG_TRUNC); | |
1178 | pr_debug("Discarded rx packet: len %zd\n", sock_len); | |
1179 | continue; | |
1180 | } | |
8dd014ad | 1181 | /* We don't need to be notified again. */ |
ba7438ae AV |
1182 | iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len); |
1183 | fixup = msg.msg_iter; | |
1184 | if (unlikely((vhost_hlen))) { | |
1185 | /* We will supply the header ourselves | |
1186 | * TODO: support TSO. | |
1187 | */ | |
1188 | iov_iter_advance(&msg.msg_iter, vhost_hlen); | |
ba7438ae | 1189 | } |
1b784140 | 1190 | err = sock->ops->recvmsg(sock, &msg, |
8dd014ad DS |
1191 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
1192 | /* Userspace might have consumed the packet meanwhile: | |
1193 | * it's not supposed to do this usually, but might be hard | |
1194 | * to prevent. Discard data we got (if any) and keep going. */ | |
1195 | if (unlikely(err != sock_len)) { | |
1196 | pr_debug("Discarded rx packet: " | |
1197 | " len %d, expected %zd\n", err, sock_len); | |
1198 | vhost_discard_vq_desc(vq, headcount); | |
1199 | continue; | |
1200 | } | |
ba7438ae | 1201 | /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ |
4c5a8442 MT |
1202 | if (unlikely(vhost_hlen)) { |
1203 | if (copy_to_iter(&hdr, sizeof(hdr), | |
1204 | &fixup) != sizeof(hdr)) { | |
1205 | vq_err(vq, "Unable to write vnet_hdr " | |
1206 | "at addr %p\n", vq->iov->iov_base); | |
8241a1e4 | 1207 | goto out; |
4c5a8442 MT |
1208 | } |
1209 | } else { | |
1210 | /* Header came from socket; we'll need to patch | |
1211 | * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF | |
1212 | */ | |
1213 | iov_iter_advance(&fixup, sizeof(hdr)); | |
8dd014ad DS |
1214 | } |
1215 | /* TODO: Should check and handle checksum. */ | |
5201aa49 | 1216 | |
0960b641 | 1217 | num_buffers = cpu_to_vhost16(vq, headcount); |
cfbdab95 | 1218 | if (likely(mergeable) && |
0d79a493 MT |
1219 | copy_to_iter(&num_buffers, sizeof num_buffers, |
1220 | &fixup) != sizeof num_buffers) { | |
8dd014ad DS |
1221 | vq_err(vq, "Failed num_buffers write"); |
1222 | vhost_discard_vq_desc(vq, headcount); | |
8241a1e4 | 1223 | goto out; |
8dd014ad | 1224 | } |
f5a4941a | 1225 | nvq->done_idx += headcount; |
d0d86971 | 1226 | if (nvq->done_idx > VHOST_NET_BATCH) |
09c32489 | 1227 | vhost_net_signal_used(nvq); |
8dd014ad | 1228 | if (unlikely(vq_log)) |
cc5e7107 JW |
1229 | vhost_log_write(vq, vq_log, log, vhost_len, |
1230 | vq->iov, in); | |
8dd014ad | 1231 | total_len += vhost_len; |
e2412c07 JW |
1232 | } while (likely(!vhost_exceeds_weight(vq, ++recv_pkts, total_len))); |
1233 | ||
be294a51 TM |
1234 | if (unlikely(busyloop_intr)) |
1235 | vhost_poll_queue(&vq->poll); | |
e2412c07 | 1236 | else if (!sock_len) |
be294a51 | 1237 | vhost_net_enable_vq(net, vq); |
2e26af79 | 1238 | out: |
09c32489 | 1239 | vhost_net_signal_used(nvq); |
8dd014ad | 1240 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
1241 | } |
1242 | ||
c23f3445 | 1243 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 1244 | { |
c23f3445 TH |
1245 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1246 | poll.work); | |
1247 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
1248 | ||
3a4d5c94 MT |
1249 | handle_tx(net); |
1250 | } | |
1251 | ||
c23f3445 | 1252 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 1253 | { |
c23f3445 TH |
1254 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1255 | poll.work); | |
1256 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
1257 | ||
3a4d5c94 MT |
1258 | handle_rx(net); |
1259 | } | |
1260 | ||
c23f3445 | 1261 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 1262 | { |
c23f3445 TH |
1263 | struct vhost_net *net = container_of(work, struct vhost_net, |
1264 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
1265 | handle_tx(net); |
1266 | } | |
1267 | ||
c23f3445 | 1268 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 1269 | { |
c23f3445 TH |
1270 | struct vhost_net *net = container_of(work, struct vhost_net, |
1271 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
1272 | handle_rx(net); |
1273 | } | |
1274 | ||
1275 | static int vhost_net_open(struct inode *inode, struct file *f) | |
1276 | { | |
23cc5a99 | 1277 | struct vhost_net *n; |
c23f3445 | 1278 | struct vhost_dev *dev; |
3ab2e420 | 1279 | struct vhost_virtqueue **vqs; |
5990a305 | 1280 | void **queue; |
0a0be13b | 1281 | struct xdp_buff *xdp; |
59566b6e | 1282 | int i; |
c23f3445 | 1283 | |
dcda9b04 | 1284 | n = kvmalloc(sizeof *n, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
6c5ab651 MH |
1285 | if (!n) |
1286 | return -ENOMEM; | |
6da2ec56 | 1287 | vqs = kmalloc_array(VHOST_NET_VQ_MAX, sizeof(*vqs), GFP_KERNEL); |
3ab2e420 | 1288 | if (!vqs) { |
d04257b0 | 1289 | kvfree(n); |
3ab2e420 AH |
1290 | return -ENOMEM; |
1291 | } | |
c23f3445 | 1292 | |
d0d86971 | 1293 | queue = kmalloc_array(VHOST_NET_BATCH, sizeof(void *), |
c67df11f JW |
1294 | GFP_KERNEL); |
1295 | if (!queue) { | |
1296 | kfree(vqs); | |
1297 | kvfree(n); | |
1298 | return -ENOMEM; | |
1299 | } | |
1300 | n->vqs[VHOST_NET_VQ_RX].rxq.queue = queue; | |
1301 | ||
0a0be13b JW |
1302 | xdp = kmalloc_array(VHOST_NET_BATCH, sizeof(*xdp), GFP_KERNEL); |
1303 | if (!xdp) { | |
1304 | kfree(vqs); | |
1305 | kvfree(n); | |
1306 | kfree(queue); | |
8a1aff14 | 1307 | return -ENOMEM; |
0a0be13b JW |
1308 | } |
1309 | n->vqs[VHOST_NET_VQ_TX].xdp = xdp; | |
1310 | ||
c23f3445 | 1311 | dev = &n->dev; |
3ab2e420 AH |
1312 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
1313 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
1314 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
1315 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
1316 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
1317 | n->vqs[i].ubufs = NULL; | |
1318 | n->vqs[i].ubuf_info = NULL; | |
1319 | n->vqs[i].upend_idx = 0; | |
1320 | n->vqs[i].done_idx = 0; | |
0a0be13b | 1321 | n->vqs[i].batched_xdp = 0; |
81f95a55 MT |
1322 | n->vqs[i].vhost_hlen = 0; |
1323 | n->vqs[i].sock_hlen = 0; | |
ab7e34b3 | 1324 | n->vqs[i].rx_ring = NULL; |
c67df11f | 1325 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f | 1326 | } |
b46a0bf7 | 1327 | vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX, |
e82b9b07 | 1328 | UIO_MAXIOV + VHOST_NET_BATCH, |
792a4f2e JW |
1329 | VHOST_NET_PKT_WEIGHT, VHOST_NET_WEIGHT, |
1330 | NULL); | |
3a4d5c94 | 1331 | |
a9a08845 LT |
1332 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, EPOLLOUT, dev); |
1333 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, EPOLLIN, dev); | |
3a4d5c94 MT |
1334 | |
1335 | f->private_data = n; | |
e4dab1e6 JW |
1336 | n->page_frag.page = NULL; |
1337 | n->refcnt_bias = 0; | |
3a4d5c94 MT |
1338 | |
1339 | return 0; | |
1340 | } | |
1341 | ||
3a4d5c94 MT |
1342 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, |
1343 | struct vhost_virtqueue *vq) | |
1344 | { | |
1345 | struct socket *sock; | |
c67df11f JW |
1346 | struct vhost_net_virtqueue *nvq = |
1347 | container_of(vq, struct vhost_net_virtqueue, vq); | |
3a4d5c94 MT |
1348 | |
1349 | mutex_lock(&vq->mutex); | |
247643f8 | 1350 | sock = vhost_vq_get_backend(vq); |
3a4d5c94 | 1351 | vhost_net_disable_vq(n, vq); |
247643f8 | 1352 | vhost_vq_set_backend(vq, NULL); |
c67df11f | 1353 | vhost_net_buf_unproduce(nvq); |
303fd71b | 1354 | nvq->rx_ring = NULL; |
3a4d5c94 MT |
1355 | mutex_unlock(&vq->mutex); |
1356 | return sock; | |
1357 | } | |
1358 | ||
1359 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
1360 | struct socket **rx_sock) | |
1361 | { | |
3ab2e420 AH |
1362 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
1363 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
1364 | } |
1365 | ||
1366 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
1367 | { | |
1368 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 1369 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
1370 | } |
1371 | ||
1372 | static void vhost_net_flush(struct vhost_net *n) | |
1373 | { | |
1374 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
1375 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 1376 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 1377 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1378 | n->tx_flush = true; |
3ab2e420 | 1379 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1380 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 1381 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 1382 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1383 | n->tx_flush = false; |
0ad8b480 | 1384 | atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); |
3ab2e420 | 1385 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1386 | } |
3a4d5c94 MT |
1387 | } |
1388 | ||
1389 | static int vhost_net_release(struct inode *inode, struct file *f) | |
1390 | { | |
1391 | struct vhost_net *n = f->private_data; | |
1392 | struct socket *tx_sock; | |
1393 | struct socket *rx_sock; | |
1394 | ||
1395 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
1396 | vhost_net_flush(n); | |
b211616d | 1397 | vhost_dev_stop(&n->dev); |
f6f93f75 | 1398 | vhost_dev_cleanup(&n->dev); |
81f95a55 | 1399 | vhost_net_vq_reset(n); |
3a4d5c94 | 1400 | if (tx_sock) |
09aaacf0 | 1401 | sockfd_put(tx_sock); |
3a4d5c94 | 1402 | if (rx_sock) |
09aaacf0 | 1403 | sockfd_put(rx_sock); |
b0c057ca | 1404 | /* Make sure no callbacks are outstanding */ |
d05faa5f | 1405 | synchronize_rcu(); |
3a4d5c94 MT |
1406 | /* We do an extra flush before freeing memory, |
1407 | * since jobs can re-queue themselves. */ | |
1408 | vhost_net_flush(n); | |
c67df11f | 1409 | kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue); |
0a0be13b | 1410 | kfree(n->vqs[VHOST_NET_VQ_TX].xdp); |
3ab2e420 | 1411 | kfree(n->dev.vqs); |
e4dab1e6 JW |
1412 | if (n->page_frag.page) |
1413 | __page_frag_cache_drain(n->page_frag.page, n->refcnt_bias); | |
d04257b0 | 1414 | kvfree(n); |
3a4d5c94 MT |
1415 | return 0; |
1416 | } | |
1417 | ||
1418 | static struct socket *get_raw_socket(int fd) | |
1419 | { | |
9b2c45d4 | 1420 | int r; |
3a4d5c94 | 1421 | struct socket *sock = sockfd_lookup(fd, &r); |
d47effe1 | 1422 | |
3a4d5c94 MT |
1423 | if (!sock) |
1424 | return ERR_PTR(-ENOTSOCK); | |
1425 | ||
1426 | /* Parameter checking */ | |
1427 | if (sock->sk->sk_type != SOCK_RAW) { | |
1428 | r = -ESOCKTNOSUPPORT; | |
1429 | goto err; | |
1430 | } | |
1431 | ||
42d84c84 | 1432 | if (sock->sk->sk_family != AF_PACKET) { |
3a4d5c94 MT |
1433 | r = -EPFNOSUPPORT; |
1434 | goto err; | |
1435 | } | |
1436 | return sock; | |
1437 | err: | |
09aaacf0 | 1438 | sockfd_put(sock); |
3a4d5c94 MT |
1439 | return ERR_PTR(r); |
1440 | } | |
1441 | ||
5990a305 | 1442 | static struct ptr_ring *get_tap_ptr_ring(int fd) |
c67df11f | 1443 | { |
5990a305 | 1444 | struct ptr_ring *ring; |
c67df11f JW |
1445 | struct file *file = fget(fd); |
1446 | ||
1447 | if (!file) | |
1448 | return NULL; | |
5990a305 JW |
1449 | ring = tun_get_tx_ring(file); |
1450 | if (!IS_ERR(ring)) | |
c67df11f | 1451 | goto out; |
5990a305 JW |
1452 | ring = tap_get_ptr_ring(file); |
1453 | if (!IS_ERR(ring)) | |
c67df11f | 1454 | goto out; |
5990a305 | 1455 | ring = NULL; |
c67df11f JW |
1456 | out: |
1457 | fput(file); | |
5990a305 | 1458 | return ring; |
c67df11f JW |
1459 | } |
1460 | ||
501c774c | 1461 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
1462 | { |
1463 | struct file *file = fget(fd); | |
1464 | struct socket *sock; | |
d47effe1 | 1465 | |
3a4d5c94 MT |
1466 | if (!file) |
1467 | return ERR_PTR(-EBADF); | |
1468 | sock = tun_get_socket(file); | |
501c774c AB |
1469 | if (!IS_ERR(sock)) |
1470 | return sock; | |
635b8c8e | 1471 | sock = tap_get_socket(file); |
3a4d5c94 MT |
1472 | if (IS_ERR(sock)) |
1473 | fput(file); | |
1474 | return sock; | |
1475 | } | |
1476 | ||
1477 | static struct socket *get_socket(int fd) | |
1478 | { | |
1479 | struct socket *sock; | |
d47effe1 | 1480 | |
3a4d5c94 MT |
1481 | /* special case to disable backend */ |
1482 | if (fd == -1) | |
1483 | return NULL; | |
1484 | sock = get_raw_socket(fd); | |
1485 | if (!IS_ERR(sock)) | |
1486 | return sock; | |
501c774c | 1487 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
1488 | if (!IS_ERR(sock)) |
1489 | return sock; | |
1490 | return ERR_PTR(-ENOTSOCK); | |
1491 | } | |
1492 | ||
1493 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
1494 | { | |
1495 | struct socket *sock, *oldsock; | |
1496 | struct vhost_virtqueue *vq; | |
2839400f | 1497 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 1498 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
1499 | int r; |
1500 | ||
1501 | mutex_lock(&n->dev.mutex); | |
1502 | r = vhost_dev_check_owner(&n->dev); | |
1503 | if (r) | |
1504 | goto err; | |
1505 | ||
1506 | if (index >= VHOST_NET_VQ_MAX) { | |
1507 | r = -ENOBUFS; | |
1508 | goto err; | |
1509 | } | |
3ab2e420 | 1510 | vq = &n->vqs[index].vq; |
2839400f | 1511 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
1512 | mutex_lock(&vq->mutex); |
1513 | ||
1514 | /* Verify that ring has been setup correctly. */ | |
1515 | if (!vhost_vq_access_ok(vq)) { | |
1516 | r = -EFAULT; | |
1dace8c8 | 1517 | goto err_vq; |
3a4d5c94 MT |
1518 | } |
1519 | sock = get_socket(fd); | |
1520 | if (IS_ERR(sock)) { | |
1521 | r = PTR_ERR(sock); | |
1dace8c8 | 1522 | goto err_vq; |
3a4d5c94 MT |
1523 | } |
1524 | ||
1525 | /* start polling new socket */ | |
247643f8 | 1526 | oldsock = vhost_vq_get_backend(vq); |
11fe8839 | 1527 | if (sock != oldsock) { |
fe729a57 AH |
1528 | ubufs = vhost_net_ubuf_alloc(vq, |
1529 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
1530 | if (IS_ERR(ubufs)) { |
1531 | r = PTR_ERR(ubufs); | |
1532 | goto err_ubufs; | |
1533 | } | |
692a998b | 1534 | |
d47effe1 | 1535 | vhost_net_disable_vq(n, vq); |
247643f8 | 1536 | vhost_vq_set_backend(vq, sock); |
c67df11f | 1537 | vhost_net_buf_unproduce(nvq); |
80f7d030 | 1538 | r = vhost_vq_init_access(vq); |
f59281da | 1539 | if (r) |
692a998b | 1540 | goto err_used; |
2b8b328b JW |
1541 | r = vhost_net_enable_vq(n, vq); |
1542 | if (r) | |
1543 | goto err_used; | |
303fd71b JW |
1544 | if (index == VHOST_NET_VQ_RX) |
1545 | nvq->rx_ring = get_tap_ptr_ring(fd); | |
692a998b | 1546 | |
2839400f AH |
1547 | oldubufs = nvq->ubufs; |
1548 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
1549 | |
1550 | n->tx_packets = 0; | |
1551 | n->tx_zcopy_err = 0; | |
1280c27f | 1552 | n->tx_flush = false; |
dd1f4078 | 1553 | } |
3a4d5c94 | 1554 | |
1680e906 MT |
1555 | mutex_unlock(&vq->mutex); |
1556 | ||
c047e5f3 | 1557 | if (oldubufs) { |
c38e39c3 | 1558 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 1559 | mutex_lock(&vq->mutex); |
eaae8132 | 1560 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
1561 | mutex_unlock(&vq->mutex); |
1562 | } | |
bab632d6 | 1563 | |
3a4d5c94 MT |
1564 | if (oldsock) { |
1565 | vhost_net_flush_vq(n, index); | |
09aaacf0 | 1566 | sockfd_put(oldsock); |
3a4d5c94 | 1567 | } |
1dace8c8 | 1568 | |
1680e906 MT |
1569 | mutex_unlock(&n->dev.mutex); |
1570 | return 0; | |
1571 | ||
692a998b | 1572 | err_used: |
247643f8 | 1573 | vhost_vq_set_backend(vq, oldsock); |
692a998b JW |
1574 | vhost_net_enable_vq(n, vq); |
1575 | if (ubufs) | |
c38e39c3 | 1576 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 | 1577 | err_ubufs: |
b8f1f658 JW |
1578 | if (sock) |
1579 | sockfd_put(sock); | |
1dace8c8 JD |
1580 | err_vq: |
1581 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
1582 | err: |
1583 | mutex_unlock(&n->dev.mutex); | |
1584 | return r; | |
1585 | } | |
1586 | ||
1587 | static long vhost_net_reset_owner(struct vhost_net *n) | |
1588 | { | |
1589 | struct socket *tx_sock = NULL; | |
1590 | struct socket *rx_sock = NULL; | |
1591 | long err; | |
0bbe3066 | 1592 | struct vhost_iotlb *umem; |
d47effe1 | 1593 | |
3a4d5c94 MT |
1594 | mutex_lock(&n->dev.mutex); |
1595 | err = vhost_dev_check_owner(&n->dev); | |
1596 | if (err) | |
1597 | goto done; | |
a9709d68 JW |
1598 | umem = vhost_dev_reset_owner_prepare(); |
1599 | if (!umem) { | |
150b9e51 MT |
1600 | err = -ENOMEM; |
1601 | goto done; | |
1602 | } | |
3a4d5c94 MT |
1603 | vhost_net_stop(n, &tx_sock, &rx_sock); |
1604 | vhost_net_flush(n); | |
4cd87951 | 1605 | vhost_dev_stop(&n->dev); |
a9709d68 | 1606 | vhost_dev_reset_owner(&n->dev, umem); |
81f95a55 | 1607 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
1608 | done: |
1609 | mutex_unlock(&n->dev.mutex); | |
1610 | if (tx_sock) | |
09aaacf0 | 1611 | sockfd_put(tx_sock); |
3a4d5c94 | 1612 | if (rx_sock) |
09aaacf0 | 1613 | sockfd_put(rx_sock); |
3a4d5c94 MT |
1614 | return err; |
1615 | } | |
1616 | ||
429711ae JW |
1617 | static int vhost_net_set_backend_features(struct vhost_net *n, u64 features) |
1618 | { | |
1619 | int i; | |
1620 | ||
1621 | mutex_lock(&n->dev.mutex); | |
1622 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { | |
1623 | mutex_lock(&n->vqs[i].vq.mutex); | |
1624 | n->vqs[i].vq.acked_backend_features = features; | |
1625 | mutex_unlock(&n->vqs[i].vq.mutex); | |
1626 | } | |
1627 | mutex_unlock(&n->dev.mutex); | |
1628 | ||
1629 | return 0; | |
1630 | } | |
1631 | ||
3a4d5c94 MT |
1632 | static int vhost_net_set_features(struct vhost_net *n, u64 features) |
1633 | { | |
8dd014ad | 1634 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1635 | int i; |
8dd014ad | 1636 | |
e4fca7d6 MT |
1637 | hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
1638 | (1ULL << VIRTIO_F_VERSION_1))) ? | |
8dd014ad DS |
1639 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
1640 | sizeof(struct virtio_net_hdr); | |
1641 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1642 | /* vhost provides vnet_hdr */ | |
1643 | vhost_hlen = hdr_len; | |
1644 | sock_hlen = 0; | |
1645 | } else { | |
1646 | /* socket provides vnet_hdr */ | |
1647 | vhost_hlen = 0; | |
1648 | sock_hlen = hdr_len; | |
1649 | } | |
3a4d5c94 MT |
1650 | mutex_lock(&n->dev.mutex); |
1651 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
6b1e6cc7 JW |
1652 | !vhost_log_access_ok(&n->dev)) |
1653 | goto out_unlock; | |
1654 | ||
1655 | if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) { | |
1656 | if (vhost_init_device_iotlb(&n->dev, true)) | |
1657 | goto out_unlock; | |
3a4d5c94 | 1658 | } |
6b1e6cc7 | 1659 | |
3a4d5c94 | 1660 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
3ab2e420 | 1661 | mutex_lock(&n->vqs[i].vq.mutex); |
ea16c514 | 1662 | n->vqs[i].vq.acked_features = features; |
81f95a55 MT |
1663 | n->vqs[i].vhost_hlen = vhost_hlen; |
1664 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1665 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 | 1666 | } |
3a4d5c94 MT |
1667 | mutex_unlock(&n->dev.mutex); |
1668 | return 0; | |
6b1e6cc7 JW |
1669 | |
1670 | out_unlock: | |
1671 | mutex_unlock(&n->dev.mutex); | |
1672 | return -EFAULT; | |
3a4d5c94 MT |
1673 | } |
1674 | ||
b1ad8496 AH |
1675 | static long vhost_net_set_owner(struct vhost_net *n) |
1676 | { | |
1677 | int r; | |
1678 | ||
1679 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1680 | if (vhost_dev_has_owner(&n->dev)) { |
1681 | r = -EBUSY; | |
1682 | goto out; | |
1683 | } | |
b1ad8496 AH |
1684 | r = vhost_net_set_ubuf_info(n); |
1685 | if (r) | |
1686 | goto out; | |
1687 | r = vhost_dev_set_owner(&n->dev); | |
1688 | if (r) | |
1689 | vhost_net_clear_ubuf_info(n); | |
1690 | vhost_net_flush(n); | |
1691 | out: | |
1692 | mutex_unlock(&n->dev.mutex); | |
1693 | return r; | |
1694 | } | |
1695 | ||
3a4d5c94 MT |
1696 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1697 | unsigned long arg) | |
1698 | { | |
1699 | struct vhost_net *n = f->private_data; | |
1700 | void __user *argp = (void __user *)arg; | |
1701 | u64 __user *featurep = argp; | |
1702 | struct vhost_vring_file backend; | |
1703 | u64 features; | |
1704 | int r; | |
d47effe1 | 1705 | |
3a4d5c94 MT |
1706 | switch (ioctl) { |
1707 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1708 | if (copy_from_user(&backend, argp, sizeof backend)) |
1709 | return -EFAULT; | |
3a4d5c94 MT |
1710 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1711 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1712 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1713 | if (copy_to_user(featurep, &features, sizeof features)) |
1714 | return -EFAULT; | |
1715 | return 0; | |
3a4d5c94 | 1716 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1717 | if (copy_from_user(&features, featurep, sizeof features)) |
1718 | return -EFAULT; | |
0dd05a3b | 1719 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1720 | return -EOPNOTSUPP; |
1721 | return vhost_net_set_features(n, features); | |
429711ae JW |
1722 | case VHOST_GET_BACKEND_FEATURES: |
1723 | features = VHOST_NET_BACKEND_FEATURES; | |
1724 | if (copy_to_user(featurep, &features, sizeof(features))) | |
1725 | return -EFAULT; | |
1726 | return 0; | |
1727 | case VHOST_SET_BACKEND_FEATURES: | |
1728 | if (copy_from_user(&features, featurep, sizeof(features))) | |
1729 | return -EFAULT; | |
1730 | if (features & ~VHOST_NET_BACKEND_FEATURES) | |
1731 | return -EOPNOTSUPP; | |
1732 | return vhost_net_set_backend_features(n, features); | |
3a4d5c94 MT |
1733 | case VHOST_RESET_OWNER: |
1734 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1735 | case VHOST_SET_OWNER: |
1736 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1737 | default: |
1738 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1739 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1740 | if (r == -ENOIOCTLCMD) | |
1741 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1742 | else | |
1743 | vhost_net_flush(n); | |
3a4d5c94 MT |
1744 | mutex_unlock(&n->dev.mutex); |
1745 | return r; | |
1746 | } | |
1747 | } | |
1748 | ||
6b1e6cc7 JW |
1749 | static ssize_t vhost_net_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1750 | { | |
1751 | struct file *file = iocb->ki_filp; | |
1752 | struct vhost_net *n = file->private_data; | |
1753 | struct vhost_dev *dev = &n->dev; | |
1754 | int noblock = file->f_flags & O_NONBLOCK; | |
1755 | ||
1756 | return vhost_chr_read_iter(dev, to, noblock); | |
1757 | } | |
1758 | ||
1759 | static ssize_t vhost_net_chr_write_iter(struct kiocb *iocb, | |
1760 | struct iov_iter *from) | |
1761 | { | |
1762 | struct file *file = iocb->ki_filp; | |
1763 | struct vhost_net *n = file->private_data; | |
1764 | struct vhost_dev *dev = &n->dev; | |
1765 | ||
1766 | return vhost_chr_write_iter(dev, from); | |
1767 | } | |
1768 | ||
afc9a42b | 1769 | static __poll_t vhost_net_chr_poll(struct file *file, poll_table *wait) |
6b1e6cc7 JW |
1770 | { |
1771 | struct vhost_net *n = file->private_data; | |
1772 | struct vhost_dev *dev = &n->dev; | |
1773 | ||
1774 | return vhost_chr_poll(file, dev, wait); | |
1775 | } | |
1776 | ||
373a83a6 | 1777 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1778 | .owner = THIS_MODULE, |
1779 | .release = vhost_net_release, | |
6b1e6cc7 JW |
1780 | .read_iter = vhost_net_chr_read_iter, |
1781 | .write_iter = vhost_net_chr_write_iter, | |
1782 | .poll = vhost_net_chr_poll, | |
3a4d5c94 | 1783 | .unlocked_ioctl = vhost_net_ioctl, |
407e9ef7 | 1784 | .compat_ioctl = compat_ptr_ioctl, |
3a4d5c94 | 1785 | .open = vhost_net_open, |
6038f373 | 1786 | .llseek = noop_llseek, |
3a4d5c94 MT |
1787 | }; |
1788 | ||
1789 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1790 | .minor = VHOST_NET_MINOR, |
1791 | .name = "vhost-net", | |
1792 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1793 | }; |
1794 | ||
a8d3782f | 1795 | static int vhost_net_init(void) |
3a4d5c94 | 1796 | { |
bab632d6 | 1797 | if (experimental_zcopytx) |
fe729a57 | 1798 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1799 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1800 | } |
1801 | module_init(vhost_net_init); | |
1802 | ||
a8d3782f | 1803 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1804 | { |
1805 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1806 | } |
1807 | module_exit(vhost_net_exit); | |
1808 | ||
1809 | MODULE_VERSION("0.0.1"); | |
1810 | MODULE_LICENSE("GPL v2"); | |
1811 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1812 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1813 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1814 | MODULE_ALIAS("devname:vhost-net"); |