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3a4d5c94 MT |
1 | /* Copyright (C) 2009 Red Hat, Inc. |
2 | * Author: Michael S. Tsirkin <mst@redhat.com> | |
3 | * | |
4 | * This work is licensed under the terms of the GNU GPL, version 2. | |
5 | * | |
6 | * virtio-net server in host kernel. | |
7 | */ | |
8 | ||
9 | #include <linux/compat.h> | |
10 | #include <linux/eventfd.h> | |
11 | #include <linux/vhost.h> | |
12 | #include <linux/virtio_net.h> | |
3a4d5c94 MT |
13 | #include <linux/miscdevice.h> |
14 | #include <linux/module.h> | |
bab632d6 | 15 | #include <linux/moduleparam.h> |
3a4d5c94 MT |
16 | #include <linux/mutex.h> |
17 | #include <linux/workqueue.h> | |
3a4d5c94 | 18 | #include <linux/file.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
e6017571 | 20 | #include <linux/sched/clock.h> |
174cd4b1 | 21 | #include <linux/sched/signal.h> |
23cc5a99 | 22 | #include <linux/vmalloc.h> |
3a4d5c94 MT |
23 | |
24 | #include <linux/net.h> | |
25 | #include <linux/if_packet.h> | |
26 | #include <linux/if_arp.h> | |
27 | #include <linux/if_tun.h> | |
501c774c | 28 | #include <linux/if_macvlan.h> |
635b8c8e | 29 | #include <linux/if_tap.h> |
c53cff5e | 30 | #include <linux/if_vlan.h> |
c67df11f JW |
31 | #include <linux/skb_array.h> |
32 | #include <linux/skbuff.h> | |
3a4d5c94 MT |
33 | |
34 | #include <net/sock.h> | |
35 | ||
36 | #include "vhost.h" | |
37 | ||
f9611c43 | 38 | static int experimental_zcopytx = 1; |
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 | ||
bab632d6 MT |
47 | /* MAX number of TX used buffers for outstanding zerocopy */ |
48 | #define VHOST_MAX_PEND 128 | |
49 | #define VHOST_GOODCOPY_LEN 256 | |
50 | ||
eaae8132 MT |
51 | /* |
52 | * For transmit, used buffer len is unused; we override it to track buffer | |
53 | * status internally; used for zerocopy tx only. | |
54 | */ | |
55 | /* Lower device DMA failed */ | |
bf995734 | 56 | #define VHOST_DMA_FAILED_LEN ((__force __virtio32)3) |
eaae8132 | 57 | /* Lower device DMA done */ |
bf995734 | 58 | #define VHOST_DMA_DONE_LEN ((__force __virtio32)2) |
eaae8132 | 59 | /* Lower device DMA in progress */ |
bf995734 | 60 | #define VHOST_DMA_IN_PROGRESS ((__force __virtio32)1) |
eaae8132 | 61 | /* Buffer unused */ |
bf995734 | 62 | #define VHOST_DMA_CLEAR_LEN ((__force __virtio32)0) |
eaae8132 | 63 | |
bf995734 | 64 | #define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force u32)VHOST_DMA_DONE_LEN) |
eaae8132 | 65 | |
8570a6e7 AH |
66 | enum { |
67 | VHOST_NET_FEATURES = VHOST_FEATURES | | |
68 | (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) | | |
6b1e6cc7 JW |
69 | (1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
70 | (1ULL << VIRTIO_F_IOMMU_PLATFORM) | |
8570a6e7 AH |
71 | }; |
72 | ||
3a4d5c94 MT |
73 | enum { |
74 | VHOST_NET_VQ_RX = 0, | |
75 | VHOST_NET_VQ_TX = 1, | |
76 | VHOST_NET_VQ_MAX = 2, | |
77 | }; | |
78 | ||
fe729a57 | 79 | struct vhost_net_ubuf_ref { |
0ad8b480 MT |
80 | /* refcount follows semantics similar to kref: |
81 | * 0: object is released | |
82 | * 1: no outstanding ubufs | |
83 | * >1: outstanding ubufs | |
84 | */ | |
85 | atomic_t refcount; | |
2839400f AH |
86 | wait_queue_head_t wait; |
87 | struct vhost_virtqueue *vq; | |
88 | }; | |
89 | ||
c67df11f JW |
90 | #define VHOST_RX_BATCH 64 |
91 | struct vhost_net_buf { | |
92 | struct sk_buff **queue; | |
93 | int tail; | |
94 | int head; | |
95 | }; | |
96 | ||
3ab2e420 AH |
97 | struct vhost_net_virtqueue { |
98 | struct vhost_virtqueue vq; | |
81f95a55 MT |
99 | size_t vhost_hlen; |
100 | size_t sock_hlen; | |
2839400f AH |
101 | /* vhost zerocopy support fields below: */ |
102 | /* last used idx for outstanding DMA zerocopy buffers */ | |
103 | int upend_idx; | |
104 | /* first used idx for DMA done zerocopy buffers */ | |
105 | int done_idx; | |
106 | /* an array of userspace buffers info */ | |
107 | struct ubuf_info *ubuf_info; | |
108 | /* Reference counting for outstanding ubufs. | |
109 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 110 | struct vhost_net_ubuf_ref *ubufs; |
c67df11f JW |
111 | struct skb_array *rx_array; |
112 | struct vhost_net_buf rxq; | |
3ab2e420 AH |
113 | }; |
114 | ||
3a4d5c94 MT |
115 | struct vhost_net { |
116 | struct vhost_dev dev; | |
3ab2e420 | 117 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 118 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
119 | /* Number of TX recently submitted. |
120 | * Protected by tx vq lock. */ | |
121 | unsigned tx_packets; | |
122 | /* Number of times zerocopy TX recently failed. | |
123 | * Protected by tx vq lock. */ | |
124 | unsigned tx_zcopy_err; | |
1280c27f MT |
125 | /* Flush in progress. Protected by tx vq lock. */ |
126 | bool tx_flush; | |
3a4d5c94 MT |
127 | }; |
128 | ||
fe729a57 | 129 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 130 | |
c67df11f JW |
131 | static void *vhost_net_buf_get_ptr(struct vhost_net_buf *rxq) |
132 | { | |
133 | if (rxq->tail != rxq->head) | |
134 | return rxq->queue[rxq->head]; | |
135 | else | |
136 | return NULL; | |
137 | } | |
138 | ||
139 | static int vhost_net_buf_get_size(struct vhost_net_buf *rxq) | |
140 | { | |
141 | return rxq->tail - rxq->head; | |
142 | } | |
143 | ||
144 | static int vhost_net_buf_is_empty(struct vhost_net_buf *rxq) | |
145 | { | |
146 | return rxq->tail == rxq->head; | |
147 | } | |
148 | ||
149 | static void *vhost_net_buf_consume(struct vhost_net_buf *rxq) | |
150 | { | |
151 | void *ret = vhost_net_buf_get_ptr(rxq); | |
152 | ++rxq->head; | |
153 | return ret; | |
154 | } | |
155 | ||
156 | static int vhost_net_buf_produce(struct vhost_net_virtqueue *nvq) | |
157 | { | |
158 | struct vhost_net_buf *rxq = &nvq->rxq; | |
159 | ||
160 | rxq->head = 0; | |
161 | rxq->tail = skb_array_consume_batched(nvq->rx_array, rxq->queue, | |
162 | VHOST_RX_BATCH); | |
163 | return rxq->tail; | |
164 | } | |
165 | ||
166 | static void vhost_net_buf_unproduce(struct vhost_net_virtqueue *nvq) | |
167 | { | |
168 | struct vhost_net_buf *rxq = &nvq->rxq; | |
169 | ||
170 | if (nvq->rx_array && !vhost_net_buf_is_empty(rxq)) { | |
171 | skb_array_unconsume(nvq->rx_array, rxq->queue + rxq->head, | |
172 | vhost_net_buf_get_size(rxq)); | |
173 | rxq->head = rxq->tail = 0; | |
174 | } | |
175 | } | |
176 | ||
177 | static int vhost_net_buf_peek(struct vhost_net_virtqueue *nvq) | |
178 | { | |
179 | struct vhost_net_buf *rxq = &nvq->rxq; | |
180 | ||
181 | if (!vhost_net_buf_is_empty(rxq)) | |
182 | goto out; | |
183 | ||
184 | if (!vhost_net_buf_produce(nvq)) | |
185 | return 0; | |
186 | ||
187 | out: | |
188 | return __skb_array_len_with_tag(vhost_net_buf_get_ptr(rxq)); | |
189 | } | |
190 | ||
191 | static void vhost_net_buf_init(struct vhost_net_buf *rxq) | |
192 | { | |
193 | rxq->head = rxq->tail = 0; | |
194 | } | |
195 | ||
fe729a57 | 196 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 197 | { |
fe729a57 | 198 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
199 | } |
200 | ||
fe729a57 AH |
201 | static struct vhost_net_ubuf_ref * |
202 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 203 | { |
fe729a57 | 204 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
205 | /* No zero copy backend? Nothing to count. */ |
206 | if (!zcopy) | |
207 | return NULL; | |
208 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
209 | if (!ubufs) | |
210 | return ERR_PTR(-ENOMEM); | |
0ad8b480 | 211 | atomic_set(&ubufs->refcount, 1); |
2839400f AH |
212 | init_waitqueue_head(&ubufs->wait); |
213 | ubufs->vq = vq; | |
214 | return ubufs; | |
215 | } | |
216 | ||
0ad8b480 | 217 | static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 218 | { |
0ad8b480 MT |
219 | int r = atomic_sub_return(1, &ubufs->refcount); |
220 | if (unlikely(!r)) | |
221 | wake_up(&ubufs->wait); | |
222 | return r; | |
2839400f AH |
223 | } |
224 | ||
fe729a57 | 225 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 226 | { |
0ad8b480 MT |
227 | vhost_net_ubuf_put(ubufs); |
228 | wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); | |
c38e39c3 MT |
229 | } |
230 | ||
231 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
232 | { | |
233 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
234 | kfree(ubufs); |
235 | } | |
236 | ||
b1ad8496 AH |
237 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
238 | { | |
b1ad8496 AH |
239 | int i; |
240 | ||
288cfe78 MT |
241 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
242 | kfree(n->vqs[i].ubuf_info); | |
243 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
244 | } |
245 | } | |
246 | ||
0a1febf7 | 247 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
248 | { |
249 | bool zcopy; | |
250 | int i; | |
251 | ||
288cfe78 | 252 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 253 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
254 | if (!zcopy) |
255 | continue; | |
256 | n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * | |
257 | UIO_MAXIOV, GFP_KERNEL); | |
258 | if (!n->vqs[i].ubuf_info) | |
259 | goto err; | |
260 | } | |
261 | return 0; | |
262 | ||
263 | err: | |
288cfe78 | 264 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
265 | return -ENOMEM; |
266 | } | |
267 | ||
0a1febf7 | 268 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
269 | { |
270 | int i; | |
271 | ||
288cfe78 MT |
272 | vhost_net_clear_ubuf_info(n); |
273 | ||
2839400f AH |
274 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
275 | n->vqs[i].done_idx = 0; | |
276 | n->vqs[i].upend_idx = 0; | |
277 | n->vqs[i].ubufs = NULL; | |
81f95a55 MT |
278 | n->vqs[i].vhost_hlen = 0; |
279 | n->vqs[i].sock_hlen = 0; | |
c67df11f | 280 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f AH |
281 | } |
282 | ||
283 | } | |
284 | ||
eaae8132 MT |
285 | static void vhost_net_tx_packet(struct vhost_net *net) |
286 | { | |
287 | ++net->tx_packets; | |
288 | if (net->tx_packets < 1024) | |
289 | return; | |
290 | net->tx_packets = 0; | |
291 | net->tx_zcopy_err = 0; | |
292 | } | |
293 | ||
294 | static void vhost_net_tx_err(struct vhost_net *net) | |
295 | { | |
296 | ++net->tx_zcopy_err; | |
297 | } | |
298 | ||
299 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
300 | { | |
1280c27f MT |
301 | /* TX flush waits for outstanding DMAs to be done. |
302 | * Don't start new DMAs. | |
303 | */ | |
304 | return !net->tx_flush && | |
305 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
306 | } |
307 | ||
bab632d6 MT |
308 | static bool vhost_sock_zcopy(struct socket *sock) |
309 | { | |
310 | return unlikely(experimental_zcopytx) && | |
311 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
312 | } | |
313 | ||
b211616d MT |
314 | /* In case of DMA done not in order in lower device driver for some reason. |
315 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
316 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
317 | * guest used idx. | |
318 | */ | |
094afe7d JW |
319 | static void vhost_zerocopy_signal_used(struct vhost_net *net, |
320 | struct vhost_virtqueue *vq) | |
b211616d | 321 | { |
2839400f AH |
322 | struct vhost_net_virtqueue *nvq = |
323 | container_of(vq, struct vhost_net_virtqueue, vq); | |
c92112ae | 324 | int i, add; |
b211616d MT |
325 | int j = 0; |
326 | ||
2839400f | 327 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
328 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
329 | vhost_net_tx_err(net); | |
b211616d MT |
330 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
331 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
b211616d MT |
332 | ++j; |
333 | } else | |
334 | break; | |
335 | } | |
c92112ae JW |
336 | while (j) { |
337 | add = min(UIO_MAXIOV - nvq->done_idx, j); | |
338 | vhost_add_used_and_signal_n(vq->dev, vq, | |
339 | &vq->heads[nvq->done_idx], add); | |
340 | nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; | |
341 | j -= add; | |
342 | } | |
b211616d MT |
343 | } |
344 | ||
eaae8132 | 345 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 346 | { |
fe729a57 | 347 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 348 | struct vhost_virtqueue *vq = ubufs->vq; |
0ad8b480 | 349 | int cnt; |
24eb21a1 | 350 | |
b0c057ca MT |
351 | rcu_read_lock_bh(); |
352 | ||
19c73b3e JW |
353 | /* set len to mark this desc buffers done DMA */ |
354 | vq->heads[ubuf->desc].len = success ? | |
355 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
0ad8b480 | 356 | cnt = vhost_net_ubuf_put(ubufs); |
19c73b3e | 357 | |
24eb21a1 MT |
358 | /* |
359 | * Trigger polling thread if guest stopped submitting new buffers: | |
0ad8b480 | 360 | * in this case, the refcount after decrement will eventually reach 1. |
24eb21a1 MT |
361 | * We also trigger polling periodically after each 16 packets |
362 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
363 | * less than 10% of times). | |
364 | */ | |
0ad8b480 | 365 | if (cnt <= 1 || !(cnt % 16)) |
24eb21a1 | 366 | vhost_poll_queue(&vq->poll); |
b0c057ca MT |
367 | |
368 | rcu_read_unlock_bh(); | |
b211616d MT |
369 | } |
370 | ||
03088137 JW |
371 | static inline unsigned long busy_clock(void) |
372 | { | |
373 | return local_clock() >> 10; | |
374 | } | |
375 | ||
376 | static bool vhost_can_busy_poll(struct vhost_dev *dev, | |
377 | unsigned long endtime) | |
378 | { | |
379 | return likely(!need_resched()) && | |
380 | likely(!time_after(busy_clock(), endtime)) && | |
381 | likely(!signal_pending(current)) && | |
382 | !vhost_has_work(dev); | |
383 | } | |
384 | ||
8241a1e4 JW |
385 | static void vhost_net_disable_vq(struct vhost_net *n, |
386 | struct vhost_virtqueue *vq) | |
387 | { | |
388 | struct vhost_net_virtqueue *nvq = | |
389 | container_of(vq, struct vhost_net_virtqueue, vq); | |
390 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
391 | if (!vq->private_data) | |
392 | return; | |
393 | vhost_poll_stop(poll); | |
394 | } | |
395 | ||
396 | static int vhost_net_enable_vq(struct vhost_net *n, | |
397 | struct vhost_virtqueue *vq) | |
398 | { | |
399 | struct vhost_net_virtqueue *nvq = | |
400 | container_of(vq, struct vhost_net_virtqueue, vq); | |
401 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
402 | struct socket *sock; | |
403 | ||
404 | sock = vq->private_data; | |
405 | if (!sock) | |
406 | return 0; | |
407 | ||
408 | return vhost_poll_start(poll, sock->file); | |
409 | } | |
410 | ||
03088137 JW |
411 | static int vhost_net_tx_get_vq_desc(struct vhost_net *net, |
412 | struct vhost_virtqueue *vq, | |
413 | struct iovec iov[], unsigned int iov_size, | |
414 | unsigned int *out_num, unsigned int *in_num) | |
415 | { | |
416 | unsigned long uninitialized_var(endtime); | |
417 | int r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 418 | out_num, in_num, NULL, NULL); |
03088137 JW |
419 | |
420 | if (r == vq->num && vq->busyloop_timeout) { | |
421 | preempt_disable(); | |
422 | endtime = busy_clock() + vq->busyloop_timeout; | |
423 | while (vhost_can_busy_poll(vq->dev, endtime) && | |
424 | vhost_vq_avail_empty(vq->dev, vq)) | |
f2f09a4c | 425 | cpu_relax(); |
03088137 JW |
426 | preempt_enable(); |
427 | r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 428 | out_num, in_num, NULL, NULL); |
03088137 JW |
429 | } |
430 | ||
431 | return r; | |
432 | } | |
433 | ||
0ed005ce JW |
434 | static bool vhost_exceeds_maxpend(struct vhost_net *net) |
435 | { | |
436 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
437 | struct vhost_virtqueue *vq = &nvq->vq; | |
438 | ||
1e6f7453 WB |
439 | return (nvq->upend_idx + UIO_MAXIOV - nvq->done_idx) % UIO_MAXIOV > |
440 | min_t(unsigned int, VHOST_MAX_PEND, vq->num >> 2); | |
0ed005ce JW |
441 | } |
442 | ||
3a4d5c94 MT |
443 | /* Expects to be always run from workqueue - which acts as |
444 | * read-size critical section for our kind of RCU. */ | |
445 | static void handle_tx(struct vhost_net *net) | |
446 | { | |
2839400f | 447 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 448 | struct vhost_virtqueue *vq = &nvq->vq; |
98a527aa | 449 | unsigned out, in; |
d5675bd2 | 450 | int head; |
3a4d5c94 MT |
451 | struct msghdr msg = { |
452 | .msg_name = NULL, | |
453 | .msg_namelen = 0, | |
454 | .msg_control = NULL, | |
455 | .msg_controllen = 0, | |
3a4d5c94 MT |
456 | .msg_flags = MSG_DONTWAIT, |
457 | }; | |
458 | size_t len, total_len = 0; | |
70181d51 | 459 | int err; |
3a4d5c94 | 460 | size_t hdr_size; |
28457ee6 | 461 | struct socket *sock; |
fe729a57 | 462 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 463 | bool zcopy, zcopy_used; |
28457ee6 | 464 | |
2e26af79 AH |
465 | mutex_lock(&vq->mutex); |
466 | sock = vq->private_data; | |
3a4d5c94 | 467 | if (!sock) |
2e26af79 | 468 | goto out; |
3a4d5c94 | 469 | |
6b1e6cc7 JW |
470 | if (!vq_iotlb_prefetch(vq)) |
471 | goto out; | |
472 | ||
8ea8cf89 | 473 | vhost_disable_notify(&net->dev, vq); |
feb8892c | 474 | vhost_net_disable_vq(net, vq); |
3a4d5c94 | 475 | |
81f95a55 | 476 | hdr_size = nvq->vhost_hlen; |
2839400f | 477 | zcopy = nvq->ubufs; |
3a4d5c94 MT |
478 | |
479 | for (;;) { | |
bab632d6 MT |
480 | /* Release DMAs done buffers first */ |
481 | if (zcopy) | |
eaae8132 | 482 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 483 | |
f7c6be40 | 484 | |
03088137 JW |
485 | head = vhost_net_tx_get_vq_desc(net, vq, vq->iov, |
486 | ARRAY_SIZE(vq->iov), | |
487 | &out, &in); | |
d5675bd2 | 488 | /* On error, stop handling until the next kick. */ |
7b3384fc | 489 | if (unlikely(head < 0)) |
d5675bd2 | 490 | break; |
3a4d5c94 MT |
491 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
492 | if (head == vq->num) { | |
8ea8cf89 MT |
493 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
494 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
495 | continue; |
496 | } | |
497 | break; | |
498 | } | |
499 | if (in) { | |
500 | vq_err(vq, "Unexpected descriptor format for TX: " | |
501 | "out %d, int %d\n", out, in); | |
502 | break; | |
503 | } | |
504 | /* Skip header. TODO: support TSO. */ | |
3a4d5c94 | 505 | len = iov_length(vq->iov, out); |
c0371da6 | 506 | iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len); |
98a527aa | 507 | iov_iter_advance(&msg.msg_iter, hdr_size); |
3a4d5c94 | 508 | /* Sanity check */ |
01e97e65 | 509 | if (!msg_data_left(&msg)) { |
3a4d5c94 MT |
510 | vq_err(vq, "Unexpected header len for TX: " |
511 | "%zd expected %zd\n", | |
98a527aa | 512 | len, hdr_size); |
3a4d5c94 MT |
513 | break; |
514 | } | |
01e97e65 | 515 | len = msg_data_left(&msg); |
ce21a029 JW |
516 | |
517 | zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN | |
1e6f7453 | 518 | && !vhost_exceeds_maxpend(net) |
ce21a029 | 519 | && vhost_net_tx_select_zcopy(net); |
cedb9bdc | 520 | |
bab632d6 | 521 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 522 | if (zcopy_used) { |
ce21a029 JW |
523 | struct ubuf_info *ubuf; |
524 | ubuf = nvq->ubuf_info + nvq->upend_idx; | |
525 | ||
8b38694a | 526 | vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); |
ce21a029 JW |
527 | vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; |
528 | ubuf->callback = vhost_zerocopy_callback; | |
529 | ubuf->ctx = nvq->ubufs; | |
530 | ubuf->desc = nvq->upend_idx; | |
c1d1b437 | 531 | refcount_set(&ubuf->refcnt, 1); |
ce21a029 JW |
532 | msg.msg_control = ubuf; |
533 | msg.msg_controllen = sizeof(ubuf); | |
534 | ubufs = nvq->ubufs; | |
0ad8b480 | 535 | atomic_inc(&ubufs->refcount); |
2839400f | 536 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
ce21a029 | 537 | } else { |
4364d5f9 | 538 | msg.msg_control = NULL; |
ce21a029 JW |
539 | ubufs = NULL; |
540 | } | |
0ed005ce JW |
541 | |
542 | total_len += len; | |
543 | if (total_len < VHOST_NET_WEIGHT && | |
544 | !vhost_vq_avail_empty(&net->dev, vq) && | |
545 | likely(!vhost_exceeds_maxpend(net))) { | |
546 | msg.msg_flags |= MSG_MORE; | |
547 | } else { | |
548 | msg.msg_flags &= ~MSG_MORE; | |
549 | } | |
550 | ||
3a4d5c94 | 551 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
1b784140 | 552 | err = sock->ops->sendmsg(sock, &msg, len); |
3a4d5c94 | 553 | if (unlikely(err < 0)) { |
cedb9bdc | 554 | if (zcopy_used) { |
ce21a029 | 555 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
556 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
557 | % UIO_MAXIOV; | |
bab632d6 | 558 | } |
8dd014ad | 559 | vhost_discard_vq_desc(vq, 1); |
feb8892c | 560 | vhost_net_enable_vq(net, vq); |
3a4d5c94 MT |
561 | break; |
562 | } | |
563 | if (err != len) | |
95c0ec6a MT |
564 | pr_debug("Truncated TX packet: " |
565 | " len %d != %zd\n", err, len); | |
cedb9bdc | 566 | if (!zcopy_used) |
bab632d6 | 567 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 568 | else |
eaae8132 | 569 | vhost_zerocopy_signal_used(net, vq); |
eaae8132 | 570 | vhost_net_tx_packet(net); |
3a4d5c94 MT |
571 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
572 | vhost_poll_queue(&vq->poll); | |
573 | break; | |
574 | } | |
575 | } | |
2e26af79 | 576 | out: |
3a4d5c94 | 577 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
578 | } |
579 | ||
c67df11f | 580 | static int peek_head_len(struct vhost_net_virtqueue *rvq, struct sock *sk) |
8dd014ad DS |
581 | { |
582 | struct sk_buff *head; | |
583 | int len = 0; | |
783e3988 | 584 | unsigned long flags; |
8dd014ad | 585 | |
c67df11f JW |
586 | if (rvq->rx_array) |
587 | return vhost_net_buf_peek(rvq); | |
1576d986 | 588 | |
783e3988 | 589 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 590 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 591 | if (likely(head)) { |
8dd014ad | 592 | len = head->len; |
df8a39de | 593 | if (skb_vlan_tag_present(head)) |
c53cff5e BG |
594 | len += VLAN_HLEN; |
595 | } | |
596 | ||
783e3988 | 597 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
598 | return len; |
599 | } | |
600 | ||
1576d986 JW |
601 | static int sk_has_rx_data(struct sock *sk) |
602 | { | |
603 | struct socket *sock = sk->sk_socket; | |
604 | ||
605 | if (sock->ops->peek_len) | |
606 | return sock->ops->peek_len(sock); | |
607 | ||
608 | return skb_queue_empty(&sk->sk_receive_queue); | |
609 | } | |
610 | ||
03088137 JW |
611 | static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk) |
612 | { | |
c67df11f | 613 | struct vhost_net_virtqueue *rvq = &net->vqs[VHOST_NET_VQ_RX]; |
03088137 JW |
614 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
615 | struct vhost_virtqueue *vq = &nvq->vq; | |
616 | unsigned long uninitialized_var(endtime); | |
c67df11f | 617 | int len = peek_head_len(rvq, sk); |
03088137 JW |
618 | |
619 | if (!len && vq->busyloop_timeout) { | |
620 | /* Both tx vq and rx socket were polled here */ | |
621 | mutex_lock(&vq->mutex); | |
622 | vhost_disable_notify(&net->dev, vq); | |
623 | ||
624 | preempt_disable(); | |
625 | endtime = busy_clock() + vq->busyloop_timeout; | |
626 | ||
627 | while (vhost_can_busy_poll(&net->dev, endtime) && | |
1576d986 | 628 | !sk_has_rx_data(sk) && |
03088137 | 629 | vhost_vq_avail_empty(&net->dev, vq)) |
f2f09a4c | 630 | cpu_relax(); |
03088137 JW |
631 | |
632 | preempt_enable(); | |
633 | ||
8b949bef | 634 | if (!vhost_vq_avail_empty(&net->dev, vq)) |
03088137 | 635 | vhost_poll_queue(&vq->poll); |
8b949bef JW |
636 | else if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
637 | vhost_disable_notify(&net->dev, vq); | |
638 | vhost_poll_queue(&vq->poll); | |
639 | } | |
640 | ||
03088137 JW |
641 | mutex_unlock(&vq->mutex); |
642 | ||
c67df11f | 643 | len = peek_head_len(rvq, sk); |
03088137 JW |
644 | } |
645 | ||
646 | return len; | |
647 | } | |
648 | ||
8dd014ad DS |
649 | /* This is a multi-buffer version of vhost_get_desc, that works if |
650 | * vq has read descriptors only. | |
651 | * @vq - the relevant virtqueue | |
652 | * @datalen - data length we'll be reading | |
653 | * @iovcount - returned count of io vectors we fill | |
654 | * @log - vhost log | |
655 | * @log_num - log offset | |
94249369 | 656 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
657 | * returns number of buffer heads allocated, negative on error |
658 | */ | |
659 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
660 | struct vring_used_elem *heads, | |
661 | int datalen, | |
662 | unsigned *iovcount, | |
663 | struct vhost_log *log, | |
94249369 JW |
664 | unsigned *log_num, |
665 | unsigned int quota) | |
8dd014ad DS |
666 | { |
667 | unsigned int out, in; | |
668 | int seg = 0; | |
669 | int headcount = 0; | |
670 | unsigned d; | |
671 | int r, nlogs = 0; | |
8b38694a MT |
672 | /* len is always initialized before use since we are always called with |
673 | * datalen > 0. | |
674 | */ | |
675 | u32 uninitialized_var(len); | |
8dd014ad | 676 | |
94249369 | 677 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 678 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
679 | r = -ENOBUFS; |
680 | goto err; | |
681 | } | |
47283bef | 682 | r = vhost_get_vq_desc(vq, vq->iov + seg, |
8dd014ad DS |
683 | ARRAY_SIZE(vq->iov) - seg, &out, |
684 | &in, log, log_num); | |
a39ee449 MT |
685 | if (unlikely(r < 0)) |
686 | goto err; | |
687 | ||
688 | d = r; | |
8dd014ad DS |
689 | if (d == vq->num) { |
690 | r = 0; | |
691 | goto err; | |
692 | } | |
693 | if (unlikely(out || in <= 0)) { | |
694 | vq_err(vq, "unexpected descriptor format for RX: " | |
695 | "out %d, in %d\n", out, in); | |
696 | r = -EINVAL; | |
697 | goto err; | |
698 | } | |
699 | if (unlikely(log)) { | |
700 | nlogs += *log_num; | |
701 | log += *log_num; | |
702 | } | |
8b38694a MT |
703 | heads[headcount].id = cpu_to_vhost32(vq, d); |
704 | len = iov_length(vq->iov + seg, in); | |
705 | heads[headcount].len = cpu_to_vhost32(vq, len); | |
706 | datalen -= len; | |
8dd014ad DS |
707 | ++headcount; |
708 | seg += in; | |
709 | } | |
99975cc6 | 710 | heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); |
8dd014ad DS |
711 | *iovcount = seg; |
712 | if (unlikely(log)) | |
713 | *log_num = nlogs; | |
d8316f39 MT |
714 | |
715 | /* Detect overrun */ | |
716 | if (unlikely(datalen > 0)) { | |
717 | r = UIO_MAXIOV + 1; | |
718 | goto err; | |
719 | } | |
8dd014ad DS |
720 | return headcount; |
721 | err: | |
722 | vhost_discard_vq_desc(vq, headcount); | |
723 | return r; | |
724 | } | |
725 | ||
3a4d5c94 MT |
726 | /* Expects to be always run from workqueue - which acts as |
727 | * read-size critical section for our kind of RCU. */ | |
94249369 | 728 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 729 | { |
81f95a55 MT |
730 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
731 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
732 | unsigned uninitialized_var(in), log; |
733 | struct vhost_log *vq_log; | |
734 | struct msghdr msg = { | |
735 | .msg_name = NULL, | |
736 | .msg_namelen = 0, | |
737 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
738 | .msg_controllen = 0, | |
8dd014ad DS |
739 | .msg_flags = MSG_DONTWAIT, |
740 | }; | |
0960b641 JW |
741 | struct virtio_net_hdr hdr = { |
742 | .flags = 0, | |
743 | .gso_type = VIRTIO_NET_HDR_GSO_NONE | |
8dd014ad | 744 | }; |
8dd014ad | 745 | size_t total_len = 0; |
910a578f MT |
746 | int err, mergeable; |
747 | s16 headcount; | |
8dd014ad DS |
748 | size_t vhost_hlen, sock_hlen; |
749 | size_t vhost_len, sock_len; | |
2e26af79 | 750 | struct socket *sock; |
ba7438ae | 751 | struct iov_iter fixup; |
0960b641 | 752 | __virtio16 num_buffers; |
8dd014ad | 753 | |
8dd014ad | 754 | mutex_lock(&vq->mutex); |
2e26af79 AH |
755 | sock = vq->private_data; |
756 | if (!sock) | |
757 | goto out; | |
6b1e6cc7 JW |
758 | |
759 | if (!vq_iotlb_prefetch(vq)) | |
760 | goto out; | |
761 | ||
8ea8cf89 | 762 | vhost_disable_notify(&net->dev, vq); |
8241a1e4 | 763 | vhost_net_disable_vq(net, vq); |
2e26af79 | 764 | |
81f95a55 MT |
765 | vhost_hlen = nvq->vhost_hlen; |
766 | sock_hlen = nvq->sock_hlen; | |
8dd014ad | 767 | |
ea16c514 | 768 | vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ? |
8dd014ad | 769 | vq->log : NULL; |
ea16c514 | 770 | mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad | 771 | |
03088137 | 772 | while ((sock_len = vhost_net_rx_peek_head_len(net, sock->sk))) { |
8dd014ad DS |
773 | sock_len += sock_hlen; |
774 | vhost_len = sock_len + vhost_hlen; | |
775 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, | |
94249369 JW |
776 | &in, vq_log, &log, |
777 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
778 | /* On error, stop handling until the next kick. */ |
779 | if (unlikely(headcount < 0)) | |
8241a1e4 | 780 | goto out; |
8dd014ad DS |
781 | /* OK, now we need to know about added descriptors. */ |
782 | if (!headcount) { | |
8ea8cf89 | 783 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
784 | /* They have slipped one in as we were |
785 | * doing that: check again. */ | |
8ea8cf89 | 786 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
787 | continue; |
788 | } | |
789 | /* Nothing new? Wait for eventfd to tell us | |
790 | * they refilled. */ | |
8241a1e4 | 791 | goto out; |
8dd014ad | 792 | } |
6e474083 WX |
793 | if (nvq->rx_array) |
794 | msg.msg_control = vhost_net_buf_consume(&nvq->rxq); | |
795 | /* On overrun, truncate and discard */ | |
796 | if (unlikely(headcount > UIO_MAXIOV)) { | |
797 | iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); | |
798 | err = sock->ops->recvmsg(sock, &msg, | |
799 | 1, MSG_DONTWAIT | MSG_TRUNC); | |
800 | pr_debug("Discarded rx packet: len %zd\n", sock_len); | |
801 | continue; | |
802 | } | |
8dd014ad | 803 | /* We don't need to be notified again. */ |
ba7438ae AV |
804 | iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len); |
805 | fixup = msg.msg_iter; | |
806 | if (unlikely((vhost_hlen))) { | |
807 | /* We will supply the header ourselves | |
808 | * TODO: support TSO. | |
809 | */ | |
810 | iov_iter_advance(&msg.msg_iter, vhost_hlen); | |
ba7438ae | 811 | } |
1b784140 | 812 | err = sock->ops->recvmsg(sock, &msg, |
8dd014ad DS |
813 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
814 | /* Userspace might have consumed the packet meanwhile: | |
815 | * it's not supposed to do this usually, but might be hard | |
816 | * to prevent. Discard data we got (if any) and keep going. */ | |
817 | if (unlikely(err != sock_len)) { | |
818 | pr_debug("Discarded rx packet: " | |
819 | " len %d, expected %zd\n", err, sock_len); | |
820 | vhost_discard_vq_desc(vq, headcount); | |
821 | continue; | |
822 | } | |
ba7438ae | 823 | /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ |
4c5a8442 MT |
824 | if (unlikely(vhost_hlen)) { |
825 | if (copy_to_iter(&hdr, sizeof(hdr), | |
826 | &fixup) != sizeof(hdr)) { | |
827 | vq_err(vq, "Unable to write vnet_hdr " | |
828 | "at addr %p\n", vq->iov->iov_base); | |
8241a1e4 | 829 | goto out; |
4c5a8442 MT |
830 | } |
831 | } else { | |
832 | /* Header came from socket; we'll need to patch | |
833 | * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF | |
834 | */ | |
835 | iov_iter_advance(&fixup, sizeof(hdr)); | |
8dd014ad DS |
836 | } |
837 | /* TODO: Should check and handle checksum. */ | |
5201aa49 | 838 | |
0960b641 | 839 | num_buffers = cpu_to_vhost16(vq, headcount); |
cfbdab95 | 840 | if (likely(mergeable) && |
0d79a493 MT |
841 | copy_to_iter(&num_buffers, sizeof num_buffers, |
842 | &fixup) != sizeof num_buffers) { | |
8dd014ad DS |
843 | vq_err(vq, "Failed num_buffers write"); |
844 | vhost_discard_vq_desc(vq, headcount); | |
8241a1e4 | 845 | goto out; |
8dd014ad DS |
846 | } |
847 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
848 | headcount); | |
849 | if (unlikely(vq_log)) | |
850 | vhost_log_write(vq, vq_log, log, vhost_len); | |
851 | total_len += vhost_len; | |
852 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
853 | vhost_poll_queue(&vq->poll); | |
8241a1e4 | 854 | goto out; |
8dd014ad DS |
855 | } |
856 | } | |
8241a1e4 | 857 | vhost_net_enable_vq(net, vq); |
2e26af79 | 858 | out: |
8dd014ad | 859 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
860 | } |
861 | ||
c23f3445 | 862 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 863 | { |
c23f3445 TH |
864 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
865 | poll.work); | |
866 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
867 | ||
3a4d5c94 MT |
868 | handle_tx(net); |
869 | } | |
870 | ||
c23f3445 | 871 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 872 | { |
c23f3445 TH |
873 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
874 | poll.work); | |
875 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
876 | ||
3a4d5c94 MT |
877 | handle_rx(net); |
878 | } | |
879 | ||
c23f3445 | 880 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 881 | { |
c23f3445 TH |
882 | struct vhost_net *net = container_of(work, struct vhost_net, |
883 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
884 | handle_tx(net); |
885 | } | |
886 | ||
c23f3445 | 887 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 888 | { |
c23f3445 TH |
889 | struct vhost_net *net = container_of(work, struct vhost_net, |
890 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
891 | handle_rx(net); |
892 | } | |
893 | ||
894 | static int vhost_net_open(struct inode *inode, struct file *f) | |
895 | { | |
23cc5a99 | 896 | struct vhost_net *n; |
c23f3445 | 897 | struct vhost_dev *dev; |
3ab2e420 | 898 | struct vhost_virtqueue **vqs; |
c67df11f | 899 | struct sk_buff **queue; |
59566b6e | 900 | int i; |
c23f3445 | 901 | |
dcda9b04 | 902 | n = kvmalloc(sizeof *n, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
6c5ab651 MH |
903 | if (!n) |
904 | return -ENOMEM; | |
3ab2e420 AH |
905 | vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
906 | if (!vqs) { | |
d04257b0 | 907 | kvfree(n); |
3ab2e420 AH |
908 | return -ENOMEM; |
909 | } | |
c23f3445 | 910 | |
c67df11f JW |
911 | queue = kmalloc_array(VHOST_RX_BATCH, sizeof(struct sk_buff *), |
912 | GFP_KERNEL); | |
913 | if (!queue) { | |
914 | kfree(vqs); | |
915 | kvfree(n); | |
916 | return -ENOMEM; | |
917 | } | |
918 | n->vqs[VHOST_NET_VQ_RX].rxq.queue = queue; | |
919 | ||
c23f3445 | 920 | dev = &n->dev; |
3ab2e420 AH |
921 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
922 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
923 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
924 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
925 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
926 | n->vqs[i].ubufs = NULL; | |
927 | n->vqs[i].ubuf_info = NULL; | |
928 | n->vqs[i].upend_idx = 0; | |
929 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
930 | n->vqs[i].vhost_hlen = 0; |
931 | n->vqs[i].sock_hlen = 0; | |
c67df11f | 932 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f | 933 | } |
59566b6e | 934 | vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 | 935 | |
c23f3445 TH |
936 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
937 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); | |
3a4d5c94 MT |
938 | |
939 | f->private_data = n; | |
940 | ||
941 | return 0; | |
942 | } | |
943 | ||
3a4d5c94 MT |
944 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, |
945 | struct vhost_virtqueue *vq) | |
946 | { | |
947 | struct socket *sock; | |
c67df11f JW |
948 | struct vhost_net_virtqueue *nvq = |
949 | container_of(vq, struct vhost_net_virtqueue, vq); | |
3a4d5c94 MT |
950 | |
951 | mutex_lock(&vq->mutex); | |
22fa90c7 | 952 | sock = vq->private_data; |
3a4d5c94 | 953 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 954 | vq->private_data = NULL; |
c67df11f | 955 | vhost_net_buf_unproduce(nvq); |
3a4d5c94 MT |
956 | mutex_unlock(&vq->mutex); |
957 | return sock; | |
958 | } | |
959 | ||
960 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
961 | struct socket **rx_sock) | |
962 | { | |
3ab2e420 AH |
963 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
964 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
965 | } |
966 | ||
967 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
968 | { | |
969 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 970 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
971 | } |
972 | ||
973 | static void vhost_net_flush(struct vhost_net *n) | |
974 | { | |
975 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
976 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 977 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 978 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 979 | n->tx_flush = true; |
3ab2e420 | 980 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 981 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 982 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 983 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 984 | n->tx_flush = false; |
0ad8b480 | 985 | atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); |
3ab2e420 | 986 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 987 | } |
3a4d5c94 MT |
988 | } |
989 | ||
990 | static int vhost_net_release(struct inode *inode, struct file *f) | |
991 | { | |
992 | struct vhost_net *n = f->private_data; | |
993 | struct socket *tx_sock; | |
994 | struct socket *rx_sock; | |
995 | ||
996 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
997 | vhost_net_flush(n); | |
b211616d | 998 | vhost_dev_stop(&n->dev); |
ea5d4046 | 999 | vhost_dev_cleanup(&n->dev, false); |
81f95a55 | 1000 | vhost_net_vq_reset(n); |
3a4d5c94 | 1001 | if (tx_sock) |
09aaacf0 | 1002 | sockfd_put(tx_sock); |
3a4d5c94 | 1003 | if (rx_sock) |
09aaacf0 | 1004 | sockfd_put(rx_sock); |
b0c057ca MT |
1005 | /* Make sure no callbacks are outstanding */ |
1006 | synchronize_rcu_bh(); | |
3a4d5c94 MT |
1007 | /* We do an extra flush before freeing memory, |
1008 | * since jobs can re-queue themselves. */ | |
1009 | vhost_net_flush(n); | |
c67df11f | 1010 | kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue); |
3ab2e420 | 1011 | kfree(n->dev.vqs); |
d04257b0 | 1012 | kvfree(n); |
3a4d5c94 MT |
1013 | return 0; |
1014 | } | |
1015 | ||
1016 | static struct socket *get_raw_socket(int fd) | |
1017 | { | |
1018 | struct { | |
1019 | struct sockaddr_ll sa; | |
1020 | char buf[MAX_ADDR_LEN]; | |
1021 | } uaddr; | |
1022 | int uaddr_len = sizeof uaddr, r; | |
1023 | struct socket *sock = sockfd_lookup(fd, &r); | |
d47effe1 | 1024 | |
3a4d5c94 MT |
1025 | if (!sock) |
1026 | return ERR_PTR(-ENOTSOCK); | |
1027 | ||
1028 | /* Parameter checking */ | |
1029 | if (sock->sk->sk_type != SOCK_RAW) { | |
1030 | r = -ESOCKTNOSUPPORT; | |
1031 | goto err; | |
1032 | } | |
1033 | ||
1034 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
1035 | &uaddr_len, 0); | |
1036 | if (r) | |
1037 | goto err; | |
1038 | ||
1039 | if (uaddr.sa.sll_family != AF_PACKET) { | |
1040 | r = -EPFNOSUPPORT; | |
1041 | goto err; | |
1042 | } | |
1043 | return sock; | |
1044 | err: | |
09aaacf0 | 1045 | sockfd_put(sock); |
3a4d5c94 MT |
1046 | return ERR_PTR(r); |
1047 | } | |
1048 | ||
c67df11f JW |
1049 | static struct skb_array *get_tap_skb_array(int fd) |
1050 | { | |
1051 | struct skb_array *array; | |
1052 | struct file *file = fget(fd); | |
1053 | ||
1054 | if (!file) | |
1055 | return NULL; | |
1056 | array = tun_get_skb_array(file); | |
1057 | if (!IS_ERR(array)) | |
1058 | goto out; | |
1059 | array = tap_get_skb_array(file); | |
1060 | if (!IS_ERR(array)) | |
1061 | goto out; | |
1062 | array = NULL; | |
1063 | out: | |
1064 | fput(file); | |
1065 | return array; | |
1066 | } | |
1067 | ||
501c774c | 1068 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
1069 | { |
1070 | struct file *file = fget(fd); | |
1071 | struct socket *sock; | |
d47effe1 | 1072 | |
3a4d5c94 MT |
1073 | if (!file) |
1074 | return ERR_PTR(-EBADF); | |
1075 | sock = tun_get_socket(file); | |
501c774c AB |
1076 | if (!IS_ERR(sock)) |
1077 | return sock; | |
635b8c8e | 1078 | sock = tap_get_socket(file); |
3a4d5c94 MT |
1079 | if (IS_ERR(sock)) |
1080 | fput(file); | |
1081 | return sock; | |
1082 | } | |
1083 | ||
1084 | static struct socket *get_socket(int fd) | |
1085 | { | |
1086 | struct socket *sock; | |
d47effe1 | 1087 | |
3a4d5c94 MT |
1088 | /* special case to disable backend */ |
1089 | if (fd == -1) | |
1090 | return NULL; | |
1091 | sock = get_raw_socket(fd); | |
1092 | if (!IS_ERR(sock)) | |
1093 | return sock; | |
501c774c | 1094 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
1095 | if (!IS_ERR(sock)) |
1096 | return sock; | |
1097 | return ERR_PTR(-ENOTSOCK); | |
1098 | } | |
1099 | ||
1100 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
1101 | { | |
1102 | struct socket *sock, *oldsock; | |
1103 | struct vhost_virtqueue *vq; | |
2839400f | 1104 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 1105 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
1106 | int r; |
1107 | ||
1108 | mutex_lock(&n->dev.mutex); | |
1109 | r = vhost_dev_check_owner(&n->dev); | |
1110 | if (r) | |
1111 | goto err; | |
1112 | ||
1113 | if (index >= VHOST_NET_VQ_MAX) { | |
1114 | r = -ENOBUFS; | |
1115 | goto err; | |
1116 | } | |
3ab2e420 | 1117 | vq = &n->vqs[index].vq; |
2839400f | 1118 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
1119 | mutex_lock(&vq->mutex); |
1120 | ||
1121 | /* Verify that ring has been setup correctly. */ | |
1122 | if (!vhost_vq_access_ok(vq)) { | |
1123 | r = -EFAULT; | |
1dace8c8 | 1124 | goto err_vq; |
3a4d5c94 MT |
1125 | } |
1126 | sock = get_socket(fd); | |
1127 | if (IS_ERR(sock)) { | |
1128 | r = PTR_ERR(sock); | |
1dace8c8 | 1129 | goto err_vq; |
3a4d5c94 MT |
1130 | } |
1131 | ||
1132 | /* start polling new socket */ | |
22fa90c7 | 1133 | oldsock = vq->private_data; |
11fe8839 | 1134 | if (sock != oldsock) { |
fe729a57 AH |
1135 | ubufs = vhost_net_ubuf_alloc(vq, |
1136 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
1137 | if (IS_ERR(ubufs)) { |
1138 | r = PTR_ERR(ubufs); | |
1139 | goto err_ubufs; | |
1140 | } | |
692a998b | 1141 | |
d47effe1 | 1142 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 1143 | vq->private_data = sock; |
c67df11f JW |
1144 | vhost_net_buf_unproduce(nvq); |
1145 | if (index == VHOST_NET_VQ_RX) | |
1146 | nvq->rx_array = get_tap_skb_array(fd); | |
80f7d030 | 1147 | r = vhost_vq_init_access(vq); |
f59281da | 1148 | if (r) |
692a998b | 1149 | goto err_used; |
2b8b328b JW |
1150 | r = vhost_net_enable_vq(n, vq); |
1151 | if (r) | |
1152 | goto err_used; | |
692a998b | 1153 | |
2839400f AH |
1154 | oldubufs = nvq->ubufs; |
1155 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
1156 | |
1157 | n->tx_packets = 0; | |
1158 | n->tx_zcopy_err = 0; | |
1280c27f | 1159 | n->tx_flush = false; |
dd1f4078 | 1160 | } |
3a4d5c94 | 1161 | |
1680e906 MT |
1162 | mutex_unlock(&vq->mutex); |
1163 | ||
c047e5f3 | 1164 | if (oldubufs) { |
c38e39c3 | 1165 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 1166 | mutex_lock(&vq->mutex); |
eaae8132 | 1167 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
1168 | mutex_unlock(&vq->mutex); |
1169 | } | |
bab632d6 | 1170 | |
3a4d5c94 MT |
1171 | if (oldsock) { |
1172 | vhost_net_flush_vq(n, index); | |
09aaacf0 | 1173 | sockfd_put(oldsock); |
3a4d5c94 | 1174 | } |
1dace8c8 | 1175 | |
1680e906 MT |
1176 | mutex_unlock(&n->dev.mutex); |
1177 | return 0; | |
1178 | ||
692a998b | 1179 | err_used: |
22fa90c7 | 1180 | vq->private_data = oldsock; |
692a998b JW |
1181 | vhost_net_enable_vq(n, vq); |
1182 | if (ubufs) | |
c38e39c3 | 1183 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 | 1184 | err_ubufs: |
09aaacf0 | 1185 | sockfd_put(sock); |
1dace8c8 JD |
1186 | err_vq: |
1187 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
1188 | err: |
1189 | mutex_unlock(&n->dev.mutex); | |
1190 | return r; | |
1191 | } | |
1192 | ||
1193 | static long vhost_net_reset_owner(struct vhost_net *n) | |
1194 | { | |
1195 | struct socket *tx_sock = NULL; | |
1196 | struct socket *rx_sock = NULL; | |
1197 | long err; | |
a9709d68 | 1198 | struct vhost_umem *umem; |
d47effe1 | 1199 | |
3a4d5c94 MT |
1200 | mutex_lock(&n->dev.mutex); |
1201 | err = vhost_dev_check_owner(&n->dev); | |
1202 | if (err) | |
1203 | goto done; | |
a9709d68 JW |
1204 | umem = vhost_dev_reset_owner_prepare(); |
1205 | if (!umem) { | |
150b9e51 MT |
1206 | err = -ENOMEM; |
1207 | goto done; | |
1208 | } | |
3a4d5c94 MT |
1209 | vhost_net_stop(n, &tx_sock, &rx_sock); |
1210 | vhost_net_flush(n); | |
a9709d68 | 1211 | vhost_dev_reset_owner(&n->dev, umem); |
81f95a55 | 1212 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
1213 | done: |
1214 | mutex_unlock(&n->dev.mutex); | |
1215 | if (tx_sock) | |
09aaacf0 | 1216 | sockfd_put(tx_sock); |
3a4d5c94 | 1217 | if (rx_sock) |
09aaacf0 | 1218 | sockfd_put(rx_sock); |
3a4d5c94 MT |
1219 | return err; |
1220 | } | |
1221 | ||
1222 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
1223 | { | |
8dd014ad | 1224 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1225 | int i; |
8dd014ad | 1226 | |
e4fca7d6 MT |
1227 | hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
1228 | (1ULL << VIRTIO_F_VERSION_1))) ? | |
8dd014ad DS |
1229 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
1230 | sizeof(struct virtio_net_hdr); | |
1231 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1232 | /* vhost provides vnet_hdr */ | |
1233 | vhost_hlen = hdr_len; | |
1234 | sock_hlen = 0; | |
1235 | } else { | |
1236 | /* socket provides vnet_hdr */ | |
1237 | vhost_hlen = 0; | |
1238 | sock_hlen = hdr_len; | |
1239 | } | |
3a4d5c94 MT |
1240 | mutex_lock(&n->dev.mutex); |
1241 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
6b1e6cc7 JW |
1242 | !vhost_log_access_ok(&n->dev)) |
1243 | goto out_unlock; | |
1244 | ||
1245 | if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) { | |
1246 | if (vhost_init_device_iotlb(&n->dev, true)) | |
1247 | goto out_unlock; | |
3a4d5c94 | 1248 | } |
6b1e6cc7 | 1249 | |
3a4d5c94 | 1250 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
3ab2e420 | 1251 | mutex_lock(&n->vqs[i].vq.mutex); |
ea16c514 | 1252 | n->vqs[i].vq.acked_features = features; |
81f95a55 MT |
1253 | n->vqs[i].vhost_hlen = vhost_hlen; |
1254 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1255 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 | 1256 | } |
3a4d5c94 MT |
1257 | mutex_unlock(&n->dev.mutex); |
1258 | return 0; | |
6b1e6cc7 JW |
1259 | |
1260 | out_unlock: | |
1261 | mutex_unlock(&n->dev.mutex); | |
1262 | return -EFAULT; | |
3a4d5c94 MT |
1263 | } |
1264 | ||
b1ad8496 AH |
1265 | static long vhost_net_set_owner(struct vhost_net *n) |
1266 | { | |
1267 | int r; | |
1268 | ||
1269 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1270 | if (vhost_dev_has_owner(&n->dev)) { |
1271 | r = -EBUSY; | |
1272 | goto out; | |
1273 | } | |
b1ad8496 AH |
1274 | r = vhost_net_set_ubuf_info(n); |
1275 | if (r) | |
1276 | goto out; | |
1277 | r = vhost_dev_set_owner(&n->dev); | |
1278 | if (r) | |
1279 | vhost_net_clear_ubuf_info(n); | |
1280 | vhost_net_flush(n); | |
1281 | out: | |
1282 | mutex_unlock(&n->dev.mutex); | |
1283 | return r; | |
1284 | } | |
1285 | ||
3a4d5c94 MT |
1286 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1287 | unsigned long arg) | |
1288 | { | |
1289 | struct vhost_net *n = f->private_data; | |
1290 | void __user *argp = (void __user *)arg; | |
1291 | u64 __user *featurep = argp; | |
1292 | struct vhost_vring_file backend; | |
1293 | u64 features; | |
1294 | int r; | |
d47effe1 | 1295 | |
3a4d5c94 MT |
1296 | switch (ioctl) { |
1297 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1298 | if (copy_from_user(&backend, argp, sizeof backend)) |
1299 | return -EFAULT; | |
3a4d5c94 MT |
1300 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1301 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1302 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1303 | if (copy_to_user(featurep, &features, sizeof features)) |
1304 | return -EFAULT; | |
1305 | return 0; | |
3a4d5c94 | 1306 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1307 | if (copy_from_user(&features, featurep, sizeof features)) |
1308 | return -EFAULT; | |
0dd05a3b | 1309 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1310 | return -EOPNOTSUPP; |
1311 | return vhost_net_set_features(n, features); | |
1312 | case VHOST_RESET_OWNER: | |
1313 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1314 | case VHOST_SET_OWNER: |
1315 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1316 | default: |
1317 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1318 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1319 | if (r == -ENOIOCTLCMD) | |
1320 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1321 | else | |
1322 | vhost_net_flush(n); | |
3a4d5c94 MT |
1323 | mutex_unlock(&n->dev.mutex); |
1324 | return r; | |
1325 | } | |
1326 | } | |
1327 | ||
1328 | #ifdef CONFIG_COMPAT | |
1329 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1330 | unsigned long arg) | |
1331 | { | |
1332 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1333 | } | |
1334 | #endif | |
1335 | ||
6b1e6cc7 JW |
1336 | static ssize_t vhost_net_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1337 | { | |
1338 | struct file *file = iocb->ki_filp; | |
1339 | struct vhost_net *n = file->private_data; | |
1340 | struct vhost_dev *dev = &n->dev; | |
1341 | int noblock = file->f_flags & O_NONBLOCK; | |
1342 | ||
1343 | return vhost_chr_read_iter(dev, to, noblock); | |
1344 | } | |
1345 | ||
1346 | static ssize_t vhost_net_chr_write_iter(struct kiocb *iocb, | |
1347 | struct iov_iter *from) | |
1348 | { | |
1349 | struct file *file = iocb->ki_filp; | |
1350 | struct vhost_net *n = file->private_data; | |
1351 | struct vhost_dev *dev = &n->dev; | |
1352 | ||
1353 | return vhost_chr_write_iter(dev, from); | |
1354 | } | |
1355 | ||
afc9a42b | 1356 | static __poll_t vhost_net_chr_poll(struct file *file, poll_table *wait) |
6b1e6cc7 JW |
1357 | { |
1358 | struct vhost_net *n = file->private_data; | |
1359 | struct vhost_dev *dev = &n->dev; | |
1360 | ||
1361 | return vhost_chr_poll(file, dev, wait); | |
1362 | } | |
1363 | ||
373a83a6 | 1364 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1365 | .owner = THIS_MODULE, |
1366 | .release = vhost_net_release, | |
6b1e6cc7 JW |
1367 | .read_iter = vhost_net_chr_read_iter, |
1368 | .write_iter = vhost_net_chr_write_iter, | |
1369 | .poll = vhost_net_chr_poll, | |
3a4d5c94 MT |
1370 | .unlocked_ioctl = vhost_net_ioctl, |
1371 | #ifdef CONFIG_COMPAT | |
1372 | .compat_ioctl = vhost_net_compat_ioctl, | |
1373 | #endif | |
1374 | .open = vhost_net_open, | |
6038f373 | 1375 | .llseek = noop_llseek, |
3a4d5c94 MT |
1376 | }; |
1377 | ||
1378 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1379 | .minor = VHOST_NET_MINOR, |
1380 | .name = "vhost-net", | |
1381 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1382 | }; |
1383 | ||
a8d3782f | 1384 | static int vhost_net_init(void) |
3a4d5c94 | 1385 | { |
bab632d6 | 1386 | if (experimental_zcopytx) |
fe729a57 | 1387 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1388 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1389 | } |
1390 | module_init(vhost_net_init); | |
1391 | ||
a8d3782f | 1392 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1393 | { |
1394 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1395 | } |
1396 | module_exit(vhost_net_exit); | |
1397 | ||
1398 | MODULE_VERSION("0.0.1"); | |
1399 | MODULE_LICENSE("GPL v2"); | |
1400 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1401 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1402 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1403 | MODULE_ALIAS("devname:vhost-net"); |