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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 | ||
5a328a2d | 47 | /* Max number of packets transferred before requeueing the job. |
3a2d7527 PA |
48 | * Using this limit prevents one virtqueue from starving others with small |
49 | * pkts. | |
50 | */ | |
51 | #define VHOST_NET_PKT_WEIGHT 256 | |
5a328a2d | 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 | ||
3a4d5c94 MT |
79 | enum { |
80 | VHOST_NET_VQ_RX = 0, | |
81 | VHOST_NET_VQ_TX = 1, | |
82 | VHOST_NET_VQ_MAX = 2, | |
83 | }; | |
84 | ||
fe729a57 | 85 | struct vhost_net_ubuf_ref { |
0ad8b480 MT |
86 | /* refcount follows semantics similar to kref: |
87 | * 0: object is released | |
88 | * 1: no outstanding ubufs | |
89 | * >1: outstanding ubufs | |
90 | */ | |
91 | atomic_t refcount; | |
2839400f AH |
92 | wait_queue_head_t wait; |
93 | struct vhost_virtqueue *vq; | |
94 | }; | |
95 | ||
c67df11f JW |
96 | #define VHOST_RX_BATCH 64 |
97 | struct vhost_net_buf { | |
98 | struct sk_buff **queue; | |
99 | int tail; | |
100 | int head; | |
101 | }; | |
102 | ||
3ab2e420 AH |
103 | struct vhost_net_virtqueue { |
104 | struct vhost_virtqueue vq; | |
81f95a55 MT |
105 | size_t vhost_hlen; |
106 | size_t sock_hlen; | |
2839400f AH |
107 | /* vhost zerocopy support fields below: */ |
108 | /* last used idx for outstanding DMA zerocopy buffers */ | |
109 | int upend_idx; | |
110 | /* first used idx for DMA done zerocopy buffers */ | |
111 | int done_idx; | |
112 | /* an array of userspace buffers info */ | |
113 | struct ubuf_info *ubuf_info; | |
114 | /* Reference counting for outstanding ubufs. | |
115 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 116 | struct vhost_net_ubuf_ref *ubufs; |
c67df11f JW |
117 | struct skb_array *rx_array; |
118 | struct vhost_net_buf rxq; | |
3ab2e420 AH |
119 | }; |
120 | ||
3a4d5c94 MT |
121 | struct vhost_net { |
122 | struct vhost_dev dev; | |
3ab2e420 | 123 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 124 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
125 | /* Number of TX recently submitted. |
126 | * Protected by tx vq lock. */ | |
127 | unsigned tx_packets; | |
128 | /* Number of times zerocopy TX recently failed. | |
129 | * Protected by tx vq lock. */ | |
130 | unsigned tx_zcopy_err; | |
1280c27f MT |
131 | /* Flush in progress. Protected by tx vq lock. */ |
132 | bool tx_flush; | |
3a4d5c94 MT |
133 | }; |
134 | ||
fe729a57 | 135 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 136 | |
c67df11f JW |
137 | static void *vhost_net_buf_get_ptr(struct vhost_net_buf *rxq) |
138 | { | |
139 | if (rxq->tail != rxq->head) | |
140 | return rxq->queue[rxq->head]; | |
141 | else | |
142 | return NULL; | |
143 | } | |
144 | ||
145 | static int vhost_net_buf_get_size(struct vhost_net_buf *rxq) | |
146 | { | |
147 | return rxq->tail - rxq->head; | |
148 | } | |
149 | ||
150 | static int vhost_net_buf_is_empty(struct vhost_net_buf *rxq) | |
151 | { | |
152 | return rxq->tail == rxq->head; | |
153 | } | |
154 | ||
155 | static void *vhost_net_buf_consume(struct vhost_net_buf *rxq) | |
156 | { | |
157 | void *ret = vhost_net_buf_get_ptr(rxq); | |
158 | ++rxq->head; | |
159 | return ret; | |
160 | } | |
161 | ||
162 | static int vhost_net_buf_produce(struct vhost_net_virtqueue *nvq) | |
163 | { | |
164 | struct vhost_net_buf *rxq = &nvq->rxq; | |
165 | ||
166 | rxq->head = 0; | |
167 | rxq->tail = skb_array_consume_batched(nvq->rx_array, rxq->queue, | |
168 | VHOST_RX_BATCH); | |
169 | return rxq->tail; | |
170 | } | |
171 | ||
172 | static void vhost_net_buf_unproduce(struct vhost_net_virtqueue *nvq) | |
173 | { | |
174 | struct vhost_net_buf *rxq = &nvq->rxq; | |
175 | ||
176 | if (nvq->rx_array && !vhost_net_buf_is_empty(rxq)) { | |
177 | skb_array_unconsume(nvq->rx_array, rxq->queue + rxq->head, | |
178 | vhost_net_buf_get_size(rxq)); | |
179 | rxq->head = rxq->tail = 0; | |
180 | } | |
181 | } | |
182 | ||
183 | static int vhost_net_buf_peek(struct vhost_net_virtqueue *nvq) | |
184 | { | |
185 | struct vhost_net_buf *rxq = &nvq->rxq; | |
186 | ||
187 | if (!vhost_net_buf_is_empty(rxq)) | |
188 | goto out; | |
189 | ||
190 | if (!vhost_net_buf_produce(nvq)) | |
191 | return 0; | |
192 | ||
193 | out: | |
194 | return __skb_array_len_with_tag(vhost_net_buf_get_ptr(rxq)); | |
195 | } | |
196 | ||
197 | static void vhost_net_buf_init(struct vhost_net_buf *rxq) | |
198 | { | |
199 | rxq->head = rxq->tail = 0; | |
200 | } | |
201 | ||
fe729a57 | 202 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 203 | { |
fe729a57 | 204 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
205 | } |
206 | ||
fe729a57 AH |
207 | static struct vhost_net_ubuf_ref * |
208 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 209 | { |
fe729a57 | 210 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
211 | /* No zero copy backend? Nothing to count. */ |
212 | if (!zcopy) | |
213 | return NULL; | |
214 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
215 | if (!ubufs) | |
216 | return ERR_PTR(-ENOMEM); | |
0ad8b480 | 217 | atomic_set(&ubufs->refcount, 1); |
2839400f AH |
218 | init_waitqueue_head(&ubufs->wait); |
219 | ubufs->vq = vq; | |
220 | return ubufs; | |
221 | } | |
222 | ||
0ad8b480 | 223 | static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 224 | { |
0ad8b480 MT |
225 | int r = atomic_sub_return(1, &ubufs->refcount); |
226 | if (unlikely(!r)) | |
227 | wake_up(&ubufs->wait); | |
228 | return r; | |
2839400f AH |
229 | } |
230 | ||
fe729a57 | 231 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 232 | { |
0ad8b480 MT |
233 | vhost_net_ubuf_put(ubufs); |
234 | wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); | |
c38e39c3 MT |
235 | } |
236 | ||
237 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
238 | { | |
239 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
240 | kfree(ubufs); |
241 | } | |
242 | ||
b1ad8496 AH |
243 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
244 | { | |
b1ad8496 AH |
245 | int i; |
246 | ||
288cfe78 MT |
247 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
248 | kfree(n->vqs[i].ubuf_info); | |
249 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
250 | } |
251 | } | |
252 | ||
0a1febf7 | 253 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
254 | { |
255 | bool zcopy; | |
256 | int i; | |
257 | ||
288cfe78 | 258 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 259 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
260 | if (!zcopy) |
261 | continue; | |
262 | n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * | |
263 | UIO_MAXIOV, GFP_KERNEL); | |
264 | if (!n->vqs[i].ubuf_info) | |
265 | goto err; | |
266 | } | |
267 | return 0; | |
268 | ||
269 | err: | |
288cfe78 | 270 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
271 | return -ENOMEM; |
272 | } | |
273 | ||
0a1febf7 | 274 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
275 | { |
276 | int i; | |
277 | ||
288cfe78 MT |
278 | vhost_net_clear_ubuf_info(n); |
279 | ||
2839400f AH |
280 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
281 | n->vqs[i].done_idx = 0; | |
282 | n->vqs[i].upend_idx = 0; | |
283 | n->vqs[i].ubufs = NULL; | |
81f95a55 MT |
284 | n->vqs[i].vhost_hlen = 0; |
285 | n->vqs[i].sock_hlen = 0; | |
c67df11f | 286 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f AH |
287 | } |
288 | ||
289 | } | |
290 | ||
eaae8132 MT |
291 | static void vhost_net_tx_packet(struct vhost_net *net) |
292 | { | |
293 | ++net->tx_packets; | |
294 | if (net->tx_packets < 1024) | |
295 | return; | |
296 | net->tx_packets = 0; | |
297 | net->tx_zcopy_err = 0; | |
298 | } | |
299 | ||
300 | static void vhost_net_tx_err(struct vhost_net *net) | |
301 | { | |
302 | ++net->tx_zcopy_err; | |
303 | } | |
304 | ||
305 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
306 | { | |
1280c27f MT |
307 | /* TX flush waits for outstanding DMAs to be done. |
308 | * Don't start new DMAs. | |
309 | */ | |
310 | return !net->tx_flush && | |
311 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
312 | } |
313 | ||
bab632d6 MT |
314 | static bool vhost_sock_zcopy(struct socket *sock) |
315 | { | |
316 | return unlikely(experimental_zcopytx) && | |
317 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
318 | } | |
319 | ||
b211616d MT |
320 | /* In case of DMA done not in order in lower device driver for some reason. |
321 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
322 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
323 | * guest used idx. | |
324 | */ | |
094afe7d JW |
325 | static void vhost_zerocopy_signal_used(struct vhost_net *net, |
326 | struct vhost_virtqueue *vq) | |
b211616d | 327 | { |
2839400f AH |
328 | struct vhost_net_virtqueue *nvq = |
329 | container_of(vq, struct vhost_net_virtqueue, vq); | |
c92112ae | 330 | int i, add; |
b211616d MT |
331 | int j = 0; |
332 | ||
2839400f | 333 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
334 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
335 | vhost_net_tx_err(net); | |
b211616d MT |
336 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
337 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
b211616d MT |
338 | ++j; |
339 | } else | |
340 | break; | |
341 | } | |
c92112ae JW |
342 | while (j) { |
343 | add = min(UIO_MAXIOV - nvq->done_idx, j); | |
344 | vhost_add_used_and_signal_n(vq->dev, vq, | |
345 | &vq->heads[nvq->done_idx], add); | |
346 | nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; | |
347 | j -= add; | |
348 | } | |
b211616d MT |
349 | } |
350 | ||
eaae8132 | 351 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 352 | { |
fe729a57 | 353 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 354 | struct vhost_virtqueue *vq = ubufs->vq; |
0ad8b480 | 355 | int cnt; |
24eb21a1 | 356 | |
b0c057ca MT |
357 | rcu_read_lock_bh(); |
358 | ||
19c73b3e JW |
359 | /* set len to mark this desc buffers done DMA */ |
360 | vq->heads[ubuf->desc].len = success ? | |
361 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
0ad8b480 | 362 | cnt = vhost_net_ubuf_put(ubufs); |
19c73b3e | 363 | |
24eb21a1 MT |
364 | /* |
365 | * Trigger polling thread if guest stopped submitting new buffers: | |
0ad8b480 | 366 | * in this case, the refcount after decrement will eventually reach 1. |
24eb21a1 MT |
367 | * We also trigger polling periodically after each 16 packets |
368 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
369 | * less than 10% of times). | |
370 | */ | |
0ad8b480 | 371 | if (cnt <= 1 || !(cnt % 16)) |
24eb21a1 | 372 | vhost_poll_queue(&vq->poll); |
b0c057ca MT |
373 | |
374 | rcu_read_unlock_bh(); | |
b211616d MT |
375 | } |
376 | ||
03088137 JW |
377 | static inline unsigned long busy_clock(void) |
378 | { | |
379 | return local_clock() >> 10; | |
380 | } | |
381 | ||
a78d3457 | 382 | static bool vhost_can_busy_poll(unsigned long endtime) |
03088137 | 383 | { |
a78d3457 TM |
384 | return likely(!need_resched() && !time_after(busy_clock(), endtime) && |
385 | !signal_pending(current)); | |
03088137 JW |
386 | } |
387 | ||
8241a1e4 JW |
388 | static void vhost_net_disable_vq(struct vhost_net *n, |
389 | struct vhost_virtqueue *vq) | |
390 | { | |
391 | struct vhost_net_virtqueue *nvq = | |
392 | container_of(vq, struct vhost_net_virtqueue, vq); | |
393 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
394 | if (!vq->private_data) | |
395 | return; | |
396 | vhost_poll_stop(poll); | |
397 | } | |
398 | ||
399 | static int vhost_net_enable_vq(struct vhost_net *n, | |
400 | struct vhost_virtqueue *vq) | |
401 | { | |
402 | struct vhost_net_virtqueue *nvq = | |
403 | container_of(vq, struct vhost_net_virtqueue, vq); | |
404 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
405 | struct socket *sock; | |
406 | ||
407 | sock = vq->private_data; | |
408 | if (!sock) | |
409 | return 0; | |
410 | ||
411 | return vhost_poll_start(poll, sock->file); | |
412 | } | |
413 | ||
03088137 JW |
414 | static int vhost_net_tx_get_vq_desc(struct vhost_net *net, |
415 | struct vhost_virtqueue *vq, | |
416 | struct iovec iov[], unsigned int iov_size, | |
a78d3457 TM |
417 | unsigned int *out_num, unsigned int *in_num, |
418 | bool *busyloop_intr) | |
03088137 JW |
419 | { |
420 | unsigned long uninitialized_var(endtime); | |
421 | int r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 422 | out_num, in_num, NULL, NULL); |
03088137 JW |
423 | |
424 | if (r == vq->num && vq->busyloop_timeout) { | |
425 | preempt_disable(); | |
426 | endtime = busy_clock() + vq->busyloop_timeout; | |
a78d3457 TM |
427 | while (vhost_can_busy_poll(endtime)) { |
428 | if (vhost_has_work(vq->dev)) { | |
429 | *busyloop_intr = true; | |
430 | break; | |
431 | } | |
432 | if (!vhost_vq_avail_empty(vq->dev, vq)) | |
433 | break; | |
f2f09a4c | 434 | cpu_relax(); |
a78d3457 | 435 | } |
03088137 JW |
436 | preempt_enable(); |
437 | r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 438 | out_num, in_num, NULL, NULL); |
03088137 JW |
439 | } |
440 | ||
441 | return r; | |
442 | } | |
443 | ||
0ed005ce JW |
444 | static bool vhost_exceeds_maxpend(struct vhost_net *net) |
445 | { | |
446 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
447 | struct vhost_virtqueue *vq = &nvq->vq; | |
448 | ||
1e6f7453 WB |
449 | return (nvq->upend_idx + UIO_MAXIOV - nvq->done_idx) % UIO_MAXIOV > |
450 | min_t(unsigned int, VHOST_MAX_PEND, vq->num >> 2); | |
0ed005ce JW |
451 | } |
452 | ||
3a4d5c94 MT |
453 | /* Expects to be always run from workqueue - which acts as |
454 | * read-size critical section for our kind of RCU. */ | |
455 | static void handle_tx(struct vhost_net *net) | |
456 | { | |
2839400f | 457 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 458 | struct vhost_virtqueue *vq = &nvq->vq; |
98a527aa | 459 | unsigned out, in; |
d5675bd2 | 460 | int head; |
3a4d5c94 MT |
461 | struct msghdr msg = { |
462 | .msg_name = NULL, | |
463 | .msg_namelen = 0, | |
464 | .msg_control = NULL, | |
465 | .msg_controllen = 0, | |
3a4d5c94 MT |
466 | .msg_flags = MSG_DONTWAIT, |
467 | }; | |
468 | size_t len, total_len = 0; | |
70181d51 | 469 | int err; |
3a4d5c94 | 470 | size_t hdr_size; |
28457ee6 | 471 | struct socket *sock; |
fe729a57 | 472 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 473 | bool zcopy, zcopy_used; |
5a328a2d | 474 | int sent_pkts = 0; |
28457ee6 | 475 | |
2e26af79 AH |
476 | mutex_lock(&vq->mutex); |
477 | sock = vq->private_data; | |
3a4d5c94 | 478 | if (!sock) |
2e26af79 | 479 | goto out; |
3a4d5c94 | 480 | |
6b1e6cc7 JW |
481 | if (!vq_iotlb_prefetch(vq)) |
482 | goto out; | |
483 | ||
8ea8cf89 | 484 | vhost_disable_notify(&net->dev, vq); |
feb8892c | 485 | vhost_net_disable_vq(net, vq); |
3a4d5c94 | 486 | |
81f95a55 | 487 | hdr_size = nvq->vhost_hlen; |
2839400f | 488 | zcopy = nvq->ubufs; |
3a4d5c94 | 489 | |
7a110057 | 490 | do { |
a78d3457 TM |
491 | bool busyloop_intr; |
492 | ||
bab632d6 MT |
493 | /* Release DMAs done buffers first */ |
494 | if (zcopy) | |
eaae8132 | 495 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 496 | |
a78d3457 | 497 | busyloop_intr = false; |
03088137 JW |
498 | head = vhost_net_tx_get_vq_desc(net, vq, vq->iov, |
499 | ARRAY_SIZE(vq->iov), | |
a78d3457 | 500 | &out, &in, &busyloop_intr); |
d5675bd2 | 501 | /* On error, stop handling until the next kick. */ |
7b3384fc | 502 | if (unlikely(head < 0)) |
d5675bd2 | 503 | break; |
3a4d5c94 MT |
504 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
505 | if (head == vq->num) { | |
a78d3457 TM |
506 | if (unlikely(busyloop_intr)) { |
507 | vhost_poll_queue(&vq->poll); | |
508 | } else if (unlikely(vhost_enable_notify(&net->dev, vq))) { | |
8ea8cf89 | 509 | vhost_disable_notify(&net->dev, vq); |
3a4d5c94 MT |
510 | continue; |
511 | } | |
512 | break; | |
513 | } | |
514 | if (in) { | |
515 | vq_err(vq, "Unexpected descriptor format for TX: " | |
516 | "out %d, int %d\n", out, in); | |
517 | break; | |
518 | } | |
519 | /* Skip header. TODO: support TSO. */ | |
3a4d5c94 | 520 | len = iov_length(vq->iov, out); |
c0371da6 | 521 | iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len); |
98a527aa | 522 | iov_iter_advance(&msg.msg_iter, hdr_size); |
3a4d5c94 | 523 | /* Sanity check */ |
01e97e65 | 524 | if (!msg_data_left(&msg)) { |
3a4d5c94 MT |
525 | vq_err(vq, "Unexpected header len for TX: " |
526 | "%zd expected %zd\n", | |
98a527aa | 527 | len, hdr_size); |
3a4d5c94 MT |
528 | break; |
529 | } | |
01e97e65 | 530 | len = msg_data_left(&msg); |
ce21a029 JW |
531 | |
532 | zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN | |
1e6f7453 | 533 | && !vhost_exceeds_maxpend(net) |
ce21a029 | 534 | && vhost_net_tx_select_zcopy(net); |
cedb9bdc | 535 | |
bab632d6 | 536 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 537 | if (zcopy_used) { |
ce21a029 JW |
538 | struct ubuf_info *ubuf; |
539 | ubuf = nvq->ubuf_info + nvq->upend_idx; | |
540 | ||
8b38694a | 541 | vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); |
ce21a029 JW |
542 | vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; |
543 | ubuf->callback = vhost_zerocopy_callback; | |
544 | ubuf->ctx = nvq->ubufs; | |
545 | ubuf->desc = nvq->upend_idx; | |
c1d1b437 | 546 | refcount_set(&ubuf->refcnt, 1); |
ce21a029 JW |
547 | msg.msg_control = ubuf; |
548 | msg.msg_controllen = sizeof(ubuf); | |
549 | ubufs = nvq->ubufs; | |
0ad8b480 | 550 | atomic_inc(&ubufs->refcount); |
2839400f | 551 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
ce21a029 | 552 | } else { |
4364d5f9 | 553 | msg.msg_control = NULL; |
ce21a029 JW |
554 | ubufs = NULL; |
555 | } | |
0ed005ce JW |
556 | total_len += len; |
557 | if (total_len < VHOST_NET_WEIGHT && | |
558 | !vhost_vq_avail_empty(&net->dev, vq) && | |
559 | likely(!vhost_exceeds_maxpend(net))) { | |
560 | msg.msg_flags |= MSG_MORE; | |
561 | } else { | |
562 | msg.msg_flags &= ~MSG_MORE; | |
563 | } | |
564 | ||
3a4d5c94 | 565 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
1b784140 | 566 | err = sock->ops->sendmsg(sock, &msg, len); |
3a4d5c94 | 567 | if (unlikely(err < 0)) { |
cedb9bdc | 568 | if (zcopy_used) { |
ce21a029 | 569 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
570 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
571 | % UIO_MAXIOV; | |
bab632d6 | 572 | } |
8dd014ad | 573 | vhost_discard_vq_desc(vq, 1); |
feb8892c | 574 | vhost_net_enable_vq(net, vq); |
3a4d5c94 MT |
575 | break; |
576 | } | |
577 | if (err != len) | |
95c0ec6a MT |
578 | pr_debug("Truncated TX packet: " |
579 | " len %d != %zd\n", err, len); | |
cedb9bdc | 580 | if (!zcopy_used) |
bab632d6 | 581 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 582 | else |
eaae8132 | 583 | vhost_zerocopy_signal_used(net, vq); |
eaae8132 | 584 | vhost_net_tx_packet(net); |
7a110057 | 585 | } while (likely(!vhost_exceeds_weight(vq, ++sent_pkts, total_len))); |
2e26af79 | 586 | out: |
3a4d5c94 | 587 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
588 | } |
589 | ||
c67df11f | 590 | static int peek_head_len(struct vhost_net_virtqueue *rvq, struct sock *sk) |
8dd014ad DS |
591 | { |
592 | struct sk_buff *head; | |
593 | int len = 0; | |
783e3988 | 594 | unsigned long flags; |
8dd014ad | 595 | |
c67df11f JW |
596 | if (rvq->rx_array) |
597 | return vhost_net_buf_peek(rvq); | |
1576d986 | 598 | |
783e3988 | 599 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 600 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 601 | if (likely(head)) { |
8dd014ad | 602 | len = head->len; |
df8a39de | 603 | if (skb_vlan_tag_present(head)) |
c53cff5e BG |
604 | len += VLAN_HLEN; |
605 | } | |
606 | ||
783e3988 | 607 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
608 | return len; |
609 | } | |
610 | ||
1576d986 JW |
611 | static int sk_has_rx_data(struct sock *sk) |
612 | { | |
613 | struct socket *sock = sk->sk_socket; | |
614 | ||
615 | if (sock->ops->peek_len) | |
616 | return sock->ops->peek_len(sock); | |
617 | ||
618 | return skb_queue_empty(&sk->sk_receive_queue); | |
619 | } | |
620 | ||
03088137 JW |
621 | static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk) |
622 | { | |
c67df11f | 623 | struct vhost_net_virtqueue *rvq = &net->vqs[VHOST_NET_VQ_RX]; |
03088137 JW |
624 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
625 | struct vhost_virtqueue *vq = &nvq->vq; | |
626 | unsigned long uninitialized_var(endtime); | |
c67df11f | 627 | int len = peek_head_len(rvq, sk); |
03088137 JW |
628 | |
629 | if (!len && vq->busyloop_timeout) { | |
630 | /* Both tx vq and rx socket were polled here */ | |
a871876a | 631 | mutex_lock_nested(&vq->mutex, 1); |
03088137 JW |
632 | vhost_disable_notify(&net->dev, vq); |
633 | ||
634 | preempt_disable(); | |
635 | endtime = busy_clock() + vq->busyloop_timeout; | |
636 | ||
a78d3457 TM |
637 | while (vhost_can_busy_poll(endtime) && |
638 | !vhost_has_work(&net->dev) && | |
1576d986 | 639 | !sk_has_rx_data(sk) && |
03088137 | 640 | vhost_vq_avail_empty(&net->dev, vq)) |
f2f09a4c | 641 | cpu_relax(); |
03088137 JW |
642 | |
643 | preempt_enable(); | |
644 | ||
8b949bef | 645 | if (!vhost_vq_avail_empty(&net->dev, vq)) |
03088137 | 646 | vhost_poll_queue(&vq->poll); |
8b949bef JW |
647 | else if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
648 | vhost_disable_notify(&net->dev, vq); | |
649 | vhost_poll_queue(&vq->poll); | |
650 | } | |
651 | ||
03088137 JW |
652 | mutex_unlock(&vq->mutex); |
653 | ||
c67df11f | 654 | len = peek_head_len(rvq, sk); |
03088137 JW |
655 | } |
656 | ||
657 | return len; | |
658 | } | |
659 | ||
8dd014ad DS |
660 | /* This is a multi-buffer version of vhost_get_desc, that works if |
661 | * vq has read descriptors only. | |
662 | * @vq - the relevant virtqueue | |
663 | * @datalen - data length we'll be reading | |
664 | * @iovcount - returned count of io vectors we fill | |
665 | * @log - vhost log | |
666 | * @log_num - log offset | |
94249369 | 667 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
668 | * returns number of buffer heads allocated, negative on error |
669 | */ | |
670 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
671 | struct vring_used_elem *heads, | |
672 | int datalen, | |
673 | unsigned *iovcount, | |
674 | struct vhost_log *log, | |
94249369 JW |
675 | unsigned *log_num, |
676 | unsigned int quota) | |
8dd014ad DS |
677 | { |
678 | unsigned int out, in; | |
679 | int seg = 0; | |
680 | int headcount = 0; | |
681 | unsigned d; | |
682 | int r, nlogs = 0; | |
8b38694a MT |
683 | /* len is always initialized before use since we are always called with |
684 | * datalen > 0. | |
685 | */ | |
686 | u32 uninitialized_var(len); | |
8dd014ad | 687 | |
94249369 | 688 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 689 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
690 | r = -ENOBUFS; |
691 | goto err; | |
692 | } | |
47283bef | 693 | r = vhost_get_vq_desc(vq, vq->iov + seg, |
8dd014ad DS |
694 | ARRAY_SIZE(vq->iov) - seg, &out, |
695 | &in, log, log_num); | |
a39ee449 MT |
696 | if (unlikely(r < 0)) |
697 | goto err; | |
698 | ||
699 | d = r; | |
8dd014ad DS |
700 | if (d == vq->num) { |
701 | r = 0; | |
702 | goto err; | |
703 | } | |
704 | if (unlikely(out || in <= 0)) { | |
705 | vq_err(vq, "unexpected descriptor format for RX: " | |
706 | "out %d, in %d\n", out, in); | |
707 | r = -EINVAL; | |
708 | goto err; | |
709 | } | |
710 | if (unlikely(log)) { | |
711 | nlogs += *log_num; | |
712 | log += *log_num; | |
713 | } | |
8b38694a MT |
714 | heads[headcount].id = cpu_to_vhost32(vq, d); |
715 | len = iov_length(vq->iov + seg, in); | |
716 | heads[headcount].len = cpu_to_vhost32(vq, len); | |
717 | datalen -= len; | |
8dd014ad DS |
718 | ++headcount; |
719 | seg += in; | |
720 | } | |
99975cc6 | 721 | heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); |
8dd014ad DS |
722 | *iovcount = seg; |
723 | if (unlikely(log)) | |
724 | *log_num = nlogs; | |
d8316f39 MT |
725 | |
726 | /* Detect overrun */ | |
727 | if (unlikely(datalen > 0)) { | |
728 | r = UIO_MAXIOV + 1; | |
729 | goto err; | |
730 | } | |
8dd014ad DS |
731 | return headcount; |
732 | err: | |
733 | vhost_discard_vq_desc(vq, headcount); | |
734 | return r; | |
735 | } | |
736 | ||
3a4d5c94 MT |
737 | /* Expects to be always run from workqueue - which acts as |
738 | * read-size critical section for our kind of RCU. */ | |
94249369 | 739 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 740 | { |
81f95a55 MT |
741 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
742 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
743 | unsigned uninitialized_var(in), log; |
744 | struct vhost_log *vq_log; | |
745 | struct msghdr msg = { | |
746 | .msg_name = NULL, | |
747 | .msg_namelen = 0, | |
748 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
749 | .msg_controllen = 0, | |
8dd014ad DS |
750 | .msg_flags = MSG_DONTWAIT, |
751 | }; | |
0960b641 JW |
752 | struct virtio_net_hdr hdr = { |
753 | .flags = 0, | |
754 | .gso_type = VIRTIO_NET_HDR_GSO_NONE | |
8dd014ad | 755 | }; |
8dd014ad | 756 | size_t total_len = 0; |
910a578f MT |
757 | int err, mergeable; |
758 | s16 headcount; | |
8dd014ad DS |
759 | size_t vhost_hlen, sock_hlen; |
760 | size_t vhost_len, sock_len; | |
2e26af79 | 761 | struct socket *sock; |
ba7438ae | 762 | struct iov_iter fixup; |
0960b641 | 763 | __virtio16 num_buffers; |
3a2d7527 | 764 | int recv_pkts = 0; |
8dd014ad | 765 | |
a871876a | 766 | mutex_lock_nested(&vq->mutex, 0); |
2e26af79 AH |
767 | sock = vq->private_data; |
768 | if (!sock) | |
769 | goto out; | |
6b1e6cc7 JW |
770 | |
771 | if (!vq_iotlb_prefetch(vq)) | |
772 | goto out; | |
773 | ||
8ea8cf89 | 774 | vhost_disable_notify(&net->dev, vq); |
8241a1e4 | 775 | vhost_net_disable_vq(net, vq); |
2e26af79 | 776 | |
81f95a55 MT |
777 | vhost_hlen = nvq->vhost_hlen; |
778 | sock_hlen = nvq->sock_hlen; | |
8dd014ad | 779 | |
ea16c514 | 780 | vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ? |
8dd014ad | 781 | vq->log : NULL; |
ea16c514 | 782 | mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad | 783 | |
7a110057 JW |
784 | do { |
785 | sock_len = vhost_net_rx_peek_head_len(net, sock->sk); | |
786 | ||
787 | if (!sock_len) | |
788 | break; | |
8dd014ad DS |
789 | sock_len += sock_hlen; |
790 | vhost_len = sock_len + vhost_hlen; | |
791 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, | |
94249369 JW |
792 | &in, vq_log, &log, |
793 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
794 | /* On error, stop handling until the next kick. */ |
795 | if (unlikely(headcount < 0)) | |
8241a1e4 | 796 | goto out; |
8dd014ad DS |
797 | /* OK, now we need to know about added descriptors. */ |
798 | if (!headcount) { | |
8ea8cf89 | 799 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
800 | /* They have slipped one in as we were |
801 | * doing that: check again. */ | |
8ea8cf89 | 802 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
803 | continue; |
804 | } | |
805 | /* Nothing new? Wait for eventfd to tell us | |
806 | * they refilled. */ | |
8241a1e4 | 807 | goto out; |
8dd014ad | 808 | } |
6e474083 WX |
809 | if (nvq->rx_array) |
810 | msg.msg_control = vhost_net_buf_consume(&nvq->rxq); | |
811 | /* On overrun, truncate and discard */ | |
812 | if (unlikely(headcount > UIO_MAXIOV)) { | |
813 | iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); | |
814 | err = sock->ops->recvmsg(sock, &msg, | |
815 | 1, MSG_DONTWAIT | MSG_TRUNC); | |
816 | pr_debug("Discarded rx packet: len %zd\n", sock_len); | |
817 | continue; | |
818 | } | |
8dd014ad | 819 | /* We don't need to be notified again. */ |
ba7438ae AV |
820 | iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len); |
821 | fixup = msg.msg_iter; | |
822 | if (unlikely((vhost_hlen))) { | |
823 | /* We will supply the header ourselves | |
824 | * TODO: support TSO. | |
825 | */ | |
826 | iov_iter_advance(&msg.msg_iter, vhost_hlen); | |
ba7438ae | 827 | } |
1b784140 | 828 | err = sock->ops->recvmsg(sock, &msg, |
8dd014ad DS |
829 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
830 | /* Userspace might have consumed the packet meanwhile: | |
831 | * it's not supposed to do this usually, but might be hard | |
832 | * to prevent. Discard data we got (if any) and keep going. */ | |
833 | if (unlikely(err != sock_len)) { | |
834 | pr_debug("Discarded rx packet: " | |
835 | " len %d, expected %zd\n", err, sock_len); | |
836 | vhost_discard_vq_desc(vq, headcount); | |
837 | continue; | |
838 | } | |
ba7438ae | 839 | /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ |
4c5a8442 MT |
840 | if (unlikely(vhost_hlen)) { |
841 | if (copy_to_iter(&hdr, sizeof(hdr), | |
842 | &fixup) != sizeof(hdr)) { | |
843 | vq_err(vq, "Unable to write vnet_hdr " | |
844 | "at addr %p\n", vq->iov->iov_base); | |
8241a1e4 | 845 | goto out; |
4c5a8442 MT |
846 | } |
847 | } else { | |
848 | /* Header came from socket; we'll need to patch | |
849 | * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF | |
850 | */ | |
851 | iov_iter_advance(&fixup, sizeof(hdr)); | |
8dd014ad DS |
852 | } |
853 | /* TODO: Should check and handle checksum. */ | |
5201aa49 | 854 | |
0960b641 | 855 | num_buffers = cpu_to_vhost16(vq, headcount); |
cfbdab95 | 856 | if (likely(mergeable) && |
0d79a493 MT |
857 | copy_to_iter(&num_buffers, sizeof num_buffers, |
858 | &fixup) != sizeof num_buffers) { | |
8dd014ad DS |
859 | vq_err(vq, "Failed num_buffers write"); |
860 | vhost_discard_vq_desc(vq, headcount); | |
8241a1e4 | 861 | goto out; |
8dd014ad DS |
862 | } |
863 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
864 | headcount); | |
865 | if (unlikely(vq_log)) | |
6fa98137 JW |
866 | vhost_log_write(vq, vq_log, log, vhost_len, |
867 | vq->iov, in); | |
8dd014ad | 868 | total_len += vhost_len; |
7a110057 JW |
869 | } while (likely(!vhost_exceeds_weight(vq, ++recv_pkts, total_len))); |
870 | ||
8241a1e4 | 871 | vhost_net_enable_vq(net, vq); |
2e26af79 | 872 | out: |
8dd014ad | 873 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
874 | } |
875 | ||
c23f3445 | 876 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 877 | { |
c23f3445 TH |
878 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
879 | poll.work); | |
880 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
881 | ||
3a4d5c94 MT |
882 | handle_tx(net); |
883 | } | |
884 | ||
c23f3445 | 885 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 886 | { |
c23f3445 TH |
887 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
888 | poll.work); | |
889 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
890 | ||
3a4d5c94 MT |
891 | handle_rx(net); |
892 | } | |
893 | ||
c23f3445 | 894 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 895 | { |
c23f3445 TH |
896 | struct vhost_net *net = container_of(work, struct vhost_net, |
897 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
898 | handle_tx(net); |
899 | } | |
900 | ||
c23f3445 | 901 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 902 | { |
c23f3445 TH |
903 | struct vhost_net *net = container_of(work, struct vhost_net, |
904 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
905 | handle_rx(net); |
906 | } | |
907 | ||
908 | static int vhost_net_open(struct inode *inode, struct file *f) | |
909 | { | |
23cc5a99 | 910 | struct vhost_net *n; |
c23f3445 | 911 | struct vhost_dev *dev; |
3ab2e420 | 912 | struct vhost_virtqueue **vqs; |
c67df11f | 913 | struct sk_buff **queue; |
59566b6e | 914 | int i; |
c23f3445 | 915 | |
dcda9b04 | 916 | n = kvmalloc(sizeof *n, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
6c5ab651 MH |
917 | if (!n) |
918 | return -ENOMEM; | |
3ab2e420 AH |
919 | vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
920 | if (!vqs) { | |
d04257b0 | 921 | kvfree(n); |
3ab2e420 AH |
922 | return -ENOMEM; |
923 | } | |
c23f3445 | 924 | |
c67df11f JW |
925 | queue = kmalloc_array(VHOST_RX_BATCH, sizeof(struct sk_buff *), |
926 | GFP_KERNEL); | |
927 | if (!queue) { | |
928 | kfree(vqs); | |
929 | kvfree(n); | |
930 | return -ENOMEM; | |
931 | } | |
932 | n->vqs[VHOST_NET_VQ_RX].rxq.queue = queue; | |
933 | ||
c23f3445 | 934 | dev = &n->dev; |
3ab2e420 AH |
935 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
936 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
937 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
938 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
939 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
940 | n->vqs[i].ubufs = NULL; | |
941 | n->vqs[i].ubuf_info = NULL; | |
942 | n->vqs[i].upend_idx = 0; | |
943 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
944 | n->vqs[i].vhost_hlen = 0; |
945 | n->vqs[i].sock_hlen = 0; | |
c67df11f | 946 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f | 947 | } |
9564f70c | 948 | vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX, |
7a110057 | 949 | VHOST_NET_PKT_WEIGHT, VHOST_NET_WEIGHT); |
3a4d5c94 | 950 | |
c23f3445 TH |
951 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
952 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); | |
3a4d5c94 MT |
953 | |
954 | f->private_data = n; | |
955 | ||
956 | return 0; | |
957 | } | |
958 | ||
3a4d5c94 MT |
959 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, |
960 | struct vhost_virtqueue *vq) | |
961 | { | |
962 | struct socket *sock; | |
c67df11f JW |
963 | struct vhost_net_virtqueue *nvq = |
964 | container_of(vq, struct vhost_net_virtqueue, vq); | |
3a4d5c94 MT |
965 | |
966 | mutex_lock(&vq->mutex); | |
22fa90c7 | 967 | sock = vq->private_data; |
3a4d5c94 | 968 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 969 | vq->private_data = NULL; |
c67df11f | 970 | vhost_net_buf_unproduce(nvq); |
3a4d5c94 MT |
971 | mutex_unlock(&vq->mutex); |
972 | return sock; | |
973 | } | |
974 | ||
975 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
976 | struct socket **rx_sock) | |
977 | { | |
3ab2e420 AH |
978 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
979 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
980 | } |
981 | ||
982 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
983 | { | |
984 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 985 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
986 | } |
987 | ||
988 | static void vhost_net_flush(struct vhost_net *n) | |
989 | { | |
990 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
991 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 992 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 993 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 994 | n->tx_flush = true; |
3ab2e420 | 995 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 996 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 997 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 998 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 999 | n->tx_flush = false; |
0ad8b480 | 1000 | atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); |
3ab2e420 | 1001 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1002 | } |
3a4d5c94 MT |
1003 | } |
1004 | ||
1005 | static int vhost_net_release(struct inode *inode, struct file *f) | |
1006 | { | |
1007 | struct vhost_net *n = f->private_data; | |
1008 | struct socket *tx_sock; | |
1009 | struct socket *rx_sock; | |
1010 | ||
1011 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
1012 | vhost_net_flush(n); | |
b211616d | 1013 | vhost_dev_stop(&n->dev); |
ea5d4046 | 1014 | vhost_dev_cleanup(&n->dev, false); |
81f95a55 | 1015 | vhost_net_vq_reset(n); |
3a4d5c94 | 1016 | if (tx_sock) |
09aaacf0 | 1017 | sockfd_put(tx_sock); |
3a4d5c94 | 1018 | if (rx_sock) |
09aaacf0 | 1019 | sockfd_put(rx_sock); |
b0c057ca MT |
1020 | /* Make sure no callbacks are outstanding */ |
1021 | synchronize_rcu_bh(); | |
3a4d5c94 MT |
1022 | /* We do an extra flush before freeing memory, |
1023 | * since jobs can re-queue themselves. */ | |
1024 | vhost_net_flush(n); | |
c67df11f | 1025 | kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue); |
3ab2e420 | 1026 | kfree(n->dev.vqs); |
d04257b0 | 1027 | kvfree(n); |
3a4d5c94 MT |
1028 | return 0; |
1029 | } | |
1030 | ||
1031 | static struct socket *get_raw_socket(int fd) | |
1032 | { | |
1033 | struct { | |
1034 | struct sockaddr_ll sa; | |
1035 | char buf[MAX_ADDR_LEN]; | |
1036 | } uaddr; | |
1037 | int uaddr_len = sizeof uaddr, r; | |
1038 | struct socket *sock = sockfd_lookup(fd, &r); | |
d47effe1 | 1039 | |
3a4d5c94 MT |
1040 | if (!sock) |
1041 | return ERR_PTR(-ENOTSOCK); | |
1042 | ||
1043 | /* Parameter checking */ | |
1044 | if (sock->sk->sk_type != SOCK_RAW) { | |
1045 | r = -ESOCKTNOSUPPORT; | |
1046 | goto err; | |
1047 | } | |
1048 | ||
1049 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
1050 | &uaddr_len, 0); | |
1051 | if (r) | |
1052 | goto err; | |
1053 | ||
1054 | if (uaddr.sa.sll_family != AF_PACKET) { | |
1055 | r = -EPFNOSUPPORT; | |
1056 | goto err; | |
1057 | } | |
1058 | return sock; | |
1059 | err: | |
09aaacf0 | 1060 | sockfd_put(sock); |
3a4d5c94 MT |
1061 | return ERR_PTR(r); |
1062 | } | |
1063 | ||
c67df11f JW |
1064 | static struct skb_array *get_tap_skb_array(int fd) |
1065 | { | |
1066 | struct skb_array *array; | |
1067 | struct file *file = fget(fd); | |
1068 | ||
1069 | if (!file) | |
1070 | return NULL; | |
1071 | array = tun_get_skb_array(file); | |
1072 | if (!IS_ERR(array)) | |
1073 | goto out; | |
1074 | array = tap_get_skb_array(file); | |
1075 | if (!IS_ERR(array)) | |
1076 | goto out; | |
1077 | array = NULL; | |
1078 | out: | |
1079 | fput(file); | |
1080 | return array; | |
1081 | } | |
1082 | ||
501c774c | 1083 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
1084 | { |
1085 | struct file *file = fget(fd); | |
1086 | struct socket *sock; | |
d47effe1 | 1087 | |
3a4d5c94 MT |
1088 | if (!file) |
1089 | return ERR_PTR(-EBADF); | |
1090 | sock = tun_get_socket(file); | |
501c774c AB |
1091 | if (!IS_ERR(sock)) |
1092 | return sock; | |
635b8c8e | 1093 | sock = tap_get_socket(file); |
3a4d5c94 MT |
1094 | if (IS_ERR(sock)) |
1095 | fput(file); | |
1096 | return sock; | |
1097 | } | |
1098 | ||
1099 | static struct socket *get_socket(int fd) | |
1100 | { | |
1101 | struct socket *sock; | |
d47effe1 | 1102 | |
3a4d5c94 MT |
1103 | /* special case to disable backend */ |
1104 | if (fd == -1) | |
1105 | return NULL; | |
1106 | sock = get_raw_socket(fd); | |
1107 | if (!IS_ERR(sock)) | |
1108 | return sock; | |
501c774c | 1109 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
1110 | if (!IS_ERR(sock)) |
1111 | return sock; | |
1112 | return ERR_PTR(-ENOTSOCK); | |
1113 | } | |
1114 | ||
1115 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
1116 | { | |
1117 | struct socket *sock, *oldsock; | |
1118 | struct vhost_virtqueue *vq; | |
2839400f | 1119 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 1120 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
1121 | int r; |
1122 | ||
1123 | mutex_lock(&n->dev.mutex); | |
1124 | r = vhost_dev_check_owner(&n->dev); | |
1125 | if (r) | |
1126 | goto err; | |
1127 | ||
1128 | if (index >= VHOST_NET_VQ_MAX) { | |
1129 | r = -ENOBUFS; | |
1130 | goto err; | |
1131 | } | |
3ab2e420 | 1132 | vq = &n->vqs[index].vq; |
2839400f | 1133 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
1134 | mutex_lock(&vq->mutex); |
1135 | ||
1136 | /* Verify that ring has been setup correctly. */ | |
1137 | if (!vhost_vq_access_ok(vq)) { | |
1138 | r = -EFAULT; | |
1dace8c8 | 1139 | goto err_vq; |
3a4d5c94 MT |
1140 | } |
1141 | sock = get_socket(fd); | |
1142 | if (IS_ERR(sock)) { | |
1143 | r = PTR_ERR(sock); | |
1dace8c8 | 1144 | goto err_vq; |
3a4d5c94 MT |
1145 | } |
1146 | ||
1147 | /* start polling new socket */ | |
22fa90c7 | 1148 | oldsock = vq->private_data; |
11fe8839 | 1149 | if (sock != oldsock) { |
fe729a57 AH |
1150 | ubufs = vhost_net_ubuf_alloc(vq, |
1151 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
1152 | if (IS_ERR(ubufs)) { |
1153 | r = PTR_ERR(ubufs); | |
1154 | goto err_ubufs; | |
1155 | } | |
692a998b | 1156 | |
d47effe1 | 1157 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 1158 | vq->private_data = sock; |
c67df11f JW |
1159 | vhost_net_buf_unproduce(nvq); |
1160 | if (index == VHOST_NET_VQ_RX) | |
1161 | nvq->rx_array = get_tap_skb_array(fd); | |
80f7d030 | 1162 | r = vhost_vq_init_access(vq); |
f59281da | 1163 | if (r) |
692a998b | 1164 | goto err_used; |
2b8b328b JW |
1165 | r = vhost_net_enable_vq(n, vq); |
1166 | if (r) | |
1167 | goto err_used; | |
692a998b | 1168 | |
2839400f AH |
1169 | oldubufs = nvq->ubufs; |
1170 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
1171 | |
1172 | n->tx_packets = 0; | |
1173 | n->tx_zcopy_err = 0; | |
1280c27f | 1174 | n->tx_flush = false; |
dd1f4078 | 1175 | } |
3a4d5c94 | 1176 | |
1680e906 MT |
1177 | mutex_unlock(&vq->mutex); |
1178 | ||
c047e5f3 | 1179 | if (oldubufs) { |
c38e39c3 | 1180 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 1181 | mutex_lock(&vq->mutex); |
eaae8132 | 1182 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
1183 | mutex_unlock(&vq->mutex); |
1184 | } | |
bab632d6 | 1185 | |
3a4d5c94 MT |
1186 | if (oldsock) { |
1187 | vhost_net_flush_vq(n, index); | |
09aaacf0 | 1188 | sockfd_put(oldsock); |
3a4d5c94 | 1189 | } |
1dace8c8 | 1190 | |
1680e906 MT |
1191 | mutex_unlock(&n->dev.mutex); |
1192 | return 0; | |
1193 | ||
692a998b | 1194 | err_used: |
22fa90c7 | 1195 | vq->private_data = oldsock; |
692a998b JW |
1196 | vhost_net_enable_vq(n, vq); |
1197 | if (ubufs) | |
c38e39c3 | 1198 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 | 1199 | err_ubufs: |
d4d0e879 JW |
1200 | if (sock) |
1201 | sockfd_put(sock); | |
1dace8c8 JD |
1202 | err_vq: |
1203 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
1204 | err: |
1205 | mutex_unlock(&n->dev.mutex); | |
1206 | return r; | |
1207 | } | |
1208 | ||
1209 | static long vhost_net_reset_owner(struct vhost_net *n) | |
1210 | { | |
1211 | struct socket *tx_sock = NULL; | |
1212 | struct socket *rx_sock = NULL; | |
1213 | long err; | |
a9709d68 | 1214 | struct vhost_umem *umem; |
d47effe1 | 1215 | |
3a4d5c94 MT |
1216 | mutex_lock(&n->dev.mutex); |
1217 | err = vhost_dev_check_owner(&n->dev); | |
1218 | if (err) | |
1219 | goto done; | |
a9709d68 JW |
1220 | umem = vhost_dev_reset_owner_prepare(); |
1221 | if (!umem) { | |
150b9e51 MT |
1222 | err = -ENOMEM; |
1223 | goto done; | |
1224 | } | |
3a4d5c94 MT |
1225 | vhost_net_stop(n, &tx_sock, &rx_sock); |
1226 | vhost_net_flush(n); | |
3a688abf | 1227 | vhost_dev_stop(&n->dev); |
a9709d68 | 1228 | vhost_dev_reset_owner(&n->dev, umem); |
81f95a55 | 1229 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
1230 | done: |
1231 | mutex_unlock(&n->dev.mutex); | |
1232 | if (tx_sock) | |
09aaacf0 | 1233 | sockfd_put(tx_sock); |
3a4d5c94 | 1234 | if (rx_sock) |
09aaacf0 | 1235 | sockfd_put(rx_sock); |
3a4d5c94 MT |
1236 | return err; |
1237 | } | |
1238 | ||
1239 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
1240 | { | |
8dd014ad | 1241 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1242 | int i; |
8dd014ad | 1243 | |
e4fca7d6 MT |
1244 | hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
1245 | (1ULL << VIRTIO_F_VERSION_1))) ? | |
8dd014ad DS |
1246 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
1247 | sizeof(struct virtio_net_hdr); | |
1248 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1249 | /* vhost provides vnet_hdr */ | |
1250 | vhost_hlen = hdr_len; | |
1251 | sock_hlen = 0; | |
1252 | } else { | |
1253 | /* socket provides vnet_hdr */ | |
1254 | vhost_hlen = 0; | |
1255 | sock_hlen = hdr_len; | |
1256 | } | |
3a4d5c94 MT |
1257 | mutex_lock(&n->dev.mutex); |
1258 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
6b1e6cc7 JW |
1259 | !vhost_log_access_ok(&n->dev)) |
1260 | goto out_unlock; | |
1261 | ||
1262 | if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) { | |
1263 | if (vhost_init_device_iotlb(&n->dev, true)) | |
1264 | goto out_unlock; | |
3a4d5c94 | 1265 | } |
6b1e6cc7 | 1266 | |
3a4d5c94 | 1267 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
3ab2e420 | 1268 | mutex_lock(&n->vqs[i].vq.mutex); |
ea16c514 | 1269 | n->vqs[i].vq.acked_features = features; |
81f95a55 MT |
1270 | n->vqs[i].vhost_hlen = vhost_hlen; |
1271 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1272 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 | 1273 | } |
3a4d5c94 MT |
1274 | mutex_unlock(&n->dev.mutex); |
1275 | return 0; | |
6b1e6cc7 JW |
1276 | |
1277 | out_unlock: | |
1278 | mutex_unlock(&n->dev.mutex); | |
1279 | return -EFAULT; | |
3a4d5c94 MT |
1280 | } |
1281 | ||
b1ad8496 AH |
1282 | static long vhost_net_set_owner(struct vhost_net *n) |
1283 | { | |
1284 | int r; | |
1285 | ||
1286 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1287 | if (vhost_dev_has_owner(&n->dev)) { |
1288 | r = -EBUSY; | |
1289 | goto out; | |
1290 | } | |
b1ad8496 AH |
1291 | r = vhost_net_set_ubuf_info(n); |
1292 | if (r) | |
1293 | goto out; | |
1294 | r = vhost_dev_set_owner(&n->dev); | |
1295 | if (r) | |
1296 | vhost_net_clear_ubuf_info(n); | |
1297 | vhost_net_flush(n); | |
1298 | out: | |
1299 | mutex_unlock(&n->dev.mutex); | |
1300 | return r; | |
1301 | } | |
1302 | ||
3a4d5c94 MT |
1303 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1304 | unsigned long arg) | |
1305 | { | |
1306 | struct vhost_net *n = f->private_data; | |
1307 | void __user *argp = (void __user *)arg; | |
1308 | u64 __user *featurep = argp; | |
1309 | struct vhost_vring_file backend; | |
1310 | u64 features; | |
1311 | int r; | |
d47effe1 | 1312 | |
3a4d5c94 MT |
1313 | switch (ioctl) { |
1314 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1315 | if (copy_from_user(&backend, argp, sizeof backend)) |
1316 | return -EFAULT; | |
3a4d5c94 MT |
1317 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1318 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1319 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1320 | if (copy_to_user(featurep, &features, sizeof features)) |
1321 | return -EFAULT; | |
1322 | return 0; | |
3a4d5c94 | 1323 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1324 | if (copy_from_user(&features, featurep, sizeof features)) |
1325 | return -EFAULT; | |
0dd05a3b | 1326 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1327 | return -EOPNOTSUPP; |
1328 | return vhost_net_set_features(n, features); | |
1329 | case VHOST_RESET_OWNER: | |
1330 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1331 | case VHOST_SET_OWNER: |
1332 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1333 | default: |
1334 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1335 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1336 | if (r == -ENOIOCTLCMD) | |
1337 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1338 | else | |
1339 | vhost_net_flush(n); | |
3a4d5c94 MT |
1340 | mutex_unlock(&n->dev.mutex); |
1341 | return r; | |
1342 | } | |
1343 | } | |
1344 | ||
1345 | #ifdef CONFIG_COMPAT | |
1346 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1347 | unsigned long arg) | |
1348 | { | |
1349 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1350 | } | |
1351 | #endif | |
1352 | ||
6b1e6cc7 JW |
1353 | static ssize_t vhost_net_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1354 | { | |
1355 | struct file *file = iocb->ki_filp; | |
1356 | struct vhost_net *n = file->private_data; | |
1357 | struct vhost_dev *dev = &n->dev; | |
1358 | int noblock = file->f_flags & O_NONBLOCK; | |
1359 | ||
1360 | return vhost_chr_read_iter(dev, to, noblock); | |
1361 | } | |
1362 | ||
1363 | static ssize_t vhost_net_chr_write_iter(struct kiocb *iocb, | |
1364 | struct iov_iter *from) | |
1365 | { | |
1366 | struct file *file = iocb->ki_filp; | |
1367 | struct vhost_net *n = file->private_data; | |
1368 | struct vhost_dev *dev = &n->dev; | |
1369 | ||
1370 | return vhost_chr_write_iter(dev, from); | |
1371 | } | |
1372 | ||
1373 | static unsigned int vhost_net_chr_poll(struct file *file, poll_table *wait) | |
1374 | { | |
1375 | struct vhost_net *n = file->private_data; | |
1376 | struct vhost_dev *dev = &n->dev; | |
1377 | ||
1378 | return vhost_chr_poll(file, dev, wait); | |
1379 | } | |
1380 | ||
373a83a6 | 1381 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1382 | .owner = THIS_MODULE, |
1383 | .release = vhost_net_release, | |
6b1e6cc7 JW |
1384 | .read_iter = vhost_net_chr_read_iter, |
1385 | .write_iter = vhost_net_chr_write_iter, | |
1386 | .poll = vhost_net_chr_poll, | |
3a4d5c94 MT |
1387 | .unlocked_ioctl = vhost_net_ioctl, |
1388 | #ifdef CONFIG_COMPAT | |
1389 | .compat_ioctl = vhost_net_compat_ioctl, | |
1390 | #endif | |
1391 | .open = vhost_net_open, | |
6038f373 | 1392 | .llseek = noop_llseek, |
3a4d5c94 MT |
1393 | }; |
1394 | ||
1395 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1396 | .minor = VHOST_NET_MINOR, |
1397 | .name = "vhost-net", | |
1398 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1399 | }; |
1400 | ||
a8d3782f | 1401 | static int vhost_net_init(void) |
3a4d5c94 | 1402 | { |
bab632d6 | 1403 | if (experimental_zcopytx) |
fe729a57 | 1404 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1405 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1406 | } |
1407 | module_init(vhost_net_init); | |
1408 | ||
a8d3782f | 1409 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1410 | { |
1411 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1412 | } |
1413 | module_exit(vhost_net_exit); | |
1414 | ||
1415 | MODULE_VERSION("0.0.1"); | |
1416 | MODULE_LICENSE("GPL v2"); | |
1417 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1418 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1419 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1420 | MODULE_ALIAS("devname:vhost-net"); |