Commit | Line | Data |
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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 { | |
5990a305 | 92 | void **queue; |
c67df11f JW |
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; |
5990a305 | 111 | struct ptr_ring *rx_ring; |
c67df11f | 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; | |
5990a305 | 161 | rxq->tail = ptr_ring_consume_batched(nvq->rx_ring, rxq->queue, |
c67df11f JW |
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 | ||
5990a305 JW |
170 | if (nvq->rx_ring && !vhost_net_buf_is_empty(rxq)) { |
171 | ptr_ring_unconsume(nvq->rx_ring, rxq->queue + rxq->head, | |
172 | vhost_net_buf_get_size(rxq), | |
173 | __skb_array_destroy_skb); | |
c67df11f JW |
174 | rxq->head = rxq->tail = 0; |
175 | } | |
176 | } | |
177 | ||
fc72d1d5 JW |
178 | static int vhost_net_buf_peek_len(void *ptr) |
179 | { | |
180 | if (tun_is_xdp_buff(ptr)) { | |
181 | struct xdp_buff *xdp = tun_ptr_to_xdp(ptr); | |
182 | ||
183 | return xdp->data_end - xdp->data; | |
184 | } | |
185 | ||
186 | return __skb_array_len_with_tag(ptr); | |
187 | } | |
188 | ||
c67df11f JW |
189 | static int vhost_net_buf_peek(struct vhost_net_virtqueue *nvq) |
190 | { | |
191 | struct vhost_net_buf *rxq = &nvq->rxq; | |
192 | ||
193 | if (!vhost_net_buf_is_empty(rxq)) | |
194 | goto out; | |
195 | ||
196 | if (!vhost_net_buf_produce(nvq)) | |
197 | return 0; | |
198 | ||
199 | out: | |
fc72d1d5 | 200 | return vhost_net_buf_peek_len(vhost_net_buf_get_ptr(rxq)); |
c67df11f JW |
201 | } |
202 | ||
203 | static void vhost_net_buf_init(struct vhost_net_buf *rxq) | |
204 | { | |
205 | rxq->head = rxq->tail = 0; | |
206 | } | |
207 | ||
fe729a57 | 208 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 209 | { |
fe729a57 | 210 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
211 | } |
212 | ||
fe729a57 AH |
213 | static struct vhost_net_ubuf_ref * |
214 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 215 | { |
fe729a57 | 216 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
217 | /* No zero copy backend? Nothing to count. */ |
218 | if (!zcopy) | |
219 | return NULL; | |
220 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
221 | if (!ubufs) | |
222 | return ERR_PTR(-ENOMEM); | |
0ad8b480 | 223 | atomic_set(&ubufs->refcount, 1); |
2839400f AH |
224 | init_waitqueue_head(&ubufs->wait); |
225 | ubufs->vq = vq; | |
226 | return ubufs; | |
227 | } | |
228 | ||
0ad8b480 | 229 | static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 230 | { |
0ad8b480 MT |
231 | int r = atomic_sub_return(1, &ubufs->refcount); |
232 | if (unlikely(!r)) | |
233 | wake_up(&ubufs->wait); | |
234 | return r; | |
2839400f AH |
235 | } |
236 | ||
fe729a57 | 237 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 238 | { |
0ad8b480 MT |
239 | vhost_net_ubuf_put(ubufs); |
240 | wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); | |
c38e39c3 MT |
241 | } |
242 | ||
243 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
244 | { | |
245 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
246 | kfree(ubufs); |
247 | } | |
248 | ||
b1ad8496 AH |
249 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
250 | { | |
b1ad8496 AH |
251 | int i; |
252 | ||
288cfe78 MT |
253 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
254 | kfree(n->vqs[i].ubuf_info); | |
255 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
256 | } |
257 | } | |
258 | ||
0a1febf7 | 259 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
260 | { |
261 | bool zcopy; | |
262 | int i; | |
263 | ||
288cfe78 | 264 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 265 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
266 | if (!zcopy) |
267 | continue; | |
268 | n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * | |
269 | UIO_MAXIOV, GFP_KERNEL); | |
270 | if (!n->vqs[i].ubuf_info) | |
271 | goto err; | |
272 | } | |
273 | return 0; | |
274 | ||
275 | err: | |
288cfe78 | 276 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
277 | return -ENOMEM; |
278 | } | |
279 | ||
0a1febf7 | 280 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
281 | { |
282 | int i; | |
283 | ||
288cfe78 MT |
284 | vhost_net_clear_ubuf_info(n); |
285 | ||
2839400f AH |
286 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
287 | n->vqs[i].done_idx = 0; | |
288 | n->vqs[i].upend_idx = 0; | |
289 | n->vqs[i].ubufs = NULL; | |
81f95a55 MT |
290 | n->vqs[i].vhost_hlen = 0; |
291 | n->vqs[i].sock_hlen = 0; | |
c67df11f | 292 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f AH |
293 | } |
294 | ||
295 | } | |
296 | ||
eaae8132 MT |
297 | static void vhost_net_tx_packet(struct vhost_net *net) |
298 | { | |
299 | ++net->tx_packets; | |
300 | if (net->tx_packets < 1024) | |
301 | return; | |
302 | net->tx_packets = 0; | |
303 | net->tx_zcopy_err = 0; | |
304 | } | |
305 | ||
306 | static void vhost_net_tx_err(struct vhost_net *net) | |
307 | { | |
308 | ++net->tx_zcopy_err; | |
309 | } | |
310 | ||
311 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
312 | { | |
1280c27f MT |
313 | /* TX flush waits for outstanding DMAs to be done. |
314 | * Don't start new DMAs. | |
315 | */ | |
316 | return !net->tx_flush && | |
317 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
318 | } |
319 | ||
bab632d6 MT |
320 | static bool vhost_sock_zcopy(struct socket *sock) |
321 | { | |
322 | return unlikely(experimental_zcopytx) && | |
323 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
324 | } | |
325 | ||
b211616d MT |
326 | /* In case of DMA done not in order in lower device driver for some reason. |
327 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
328 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
329 | * guest used idx. | |
330 | */ | |
094afe7d JW |
331 | static void vhost_zerocopy_signal_used(struct vhost_net *net, |
332 | struct vhost_virtqueue *vq) | |
b211616d | 333 | { |
2839400f AH |
334 | struct vhost_net_virtqueue *nvq = |
335 | container_of(vq, struct vhost_net_virtqueue, vq); | |
c92112ae | 336 | int i, add; |
b211616d MT |
337 | int j = 0; |
338 | ||
2839400f | 339 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
340 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
341 | vhost_net_tx_err(net); | |
b211616d MT |
342 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
343 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
b211616d MT |
344 | ++j; |
345 | } else | |
346 | break; | |
347 | } | |
c92112ae JW |
348 | while (j) { |
349 | add = min(UIO_MAXIOV - nvq->done_idx, j); | |
350 | vhost_add_used_and_signal_n(vq->dev, vq, | |
351 | &vq->heads[nvq->done_idx], add); | |
352 | nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; | |
353 | j -= add; | |
354 | } | |
b211616d MT |
355 | } |
356 | ||
eaae8132 | 357 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 358 | { |
fe729a57 | 359 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 360 | struct vhost_virtqueue *vq = ubufs->vq; |
0ad8b480 | 361 | int cnt; |
24eb21a1 | 362 | |
b0c057ca MT |
363 | rcu_read_lock_bh(); |
364 | ||
19c73b3e JW |
365 | /* set len to mark this desc buffers done DMA */ |
366 | vq->heads[ubuf->desc].len = success ? | |
367 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
0ad8b480 | 368 | cnt = vhost_net_ubuf_put(ubufs); |
19c73b3e | 369 | |
24eb21a1 MT |
370 | /* |
371 | * Trigger polling thread if guest stopped submitting new buffers: | |
0ad8b480 | 372 | * in this case, the refcount after decrement will eventually reach 1. |
24eb21a1 MT |
373 | * We also trigger polling periodically after each 16 packets |
374 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
375 | * less than 10% of times). | |
376 | */ | |
0ad8b480 | 377 | if (cnt <= 1 || !(cnt % 16)) |
24eb21a1 | 378 | vhost_poll_queue(&vq->poll); |
b0c057ca MT |
379 | |
380 | rcu_read_unlock_bh(); | |
b211616d MT |
381 | } |
382 | ||
03088137 JW |
383 | static inline unsigned long busy_clock(void) |
384 | { | |
385 | return local_clock() >> 10; | |
386 | } | |
387 | ||
388 | static bool vhost_can_busy_poll(struct vhost_dev *dev, | |
389 | unsigned long endtime) | |
390 | { | |
391 | return likely(!need_resched()) && | |
392 | likely(!time_after(busy_clock(), endtime)) && | |
393 | likely(!signal_pending(current)) && | |
394 | !vhost_has_work(dev); | |
395 | } | |
396 | ||
8241a1e4 JW |
397 | static void vhost_net_disable_vq(struct vhost_net *n, |
398 | struct vhost_virtqueue *vq) | |
399 | { | |
400 | struct vhost_net_virtqueue *nvq = | |
401 | container_of(vq, struct vhost_net_virtqueue, vq); | |
402 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
403 | if (!vq->private_data) | |
404 | return; | |
405 | vhost_poll_stop(poll); | |
406 | } | |
407 | ||
408 | static int vhost_net_enable_vq(struct vhost_net *n, | |
409 | struct vhost_virtqueue *vq) | |
410 | { | |
411 | struct vhost_net_virtqueue *nvq = | |
412 | container_of(vq, struct vhost_net_virtqueue, vq); | |
413 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
414 | struct socket *sock; | |
415 | ||
416 | sock = vq->private_data; | |
417 | if (!sock) | |
418 | return 0; | |
419 | ||
420 | return vhost_poll_start(poll, sock->file); | |
421 | } | |
422 | ||
03088137 JW |
423 | static int vhost_net_tx_get_vq_desc(struct vhost_net *net, |
424 | struct vhost_virtqueue *vq, | |
425 | struct iovec iov[], unsigned int iov_size, | |
426 | unsigned int *out_num, unsigned int *in_num) | |
427 | { | |
428 | unsigned long uninitialized_var(endtime); | |
429 | int r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 430 | out_num, in_num, NULL, NULL); |
03088137 JW |
431 | |
432 | if (r == vq->num && vq->busyloop_timeout) { | |
433 | preempt_disable(); | |
434 | endtime = busy_clock() + vq->busyloop_timeout; | |
435 | while (vhost_can_busy_poll(vq->dev, endtime) && | |
436 | vhost_vq_avail_empty(vq->dev, vq)) | |
f2f09a4c | 437 | cpu_relax(); |
03088137 JW |
438 | preempt_enable(); |
439 | r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 440 | out_num, in_num, NULL, NULL); |
03088137 JW |
441 | } |
442 | ||
443 | return r; | |
444 | } | |
445 | ||
0ed005ce JW |
446 | static bool vhost_exceeds_maxpend(struct vhost_net *net) |
447 | { | |
448 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
449 | struct vhost_virtqueue *vq = &nvq->vq; | |
450 | ||
1e6f7453 WB |
451 | return (nvq->upend_idx + UIO_MAXIOV - nvq->done_idx) % UIO_MAXIOV > |
452 | min_t(unsigned int, VHOST_MAX_PEND, vq->num >> 2); | |
0ed005ce JW |
453 | } |
454 | ||
3a4d5c94 MT |
455 | /* Expects to be always run from workqueue - which acts as |
456 | * read-size critical section for our kind of RCU. */ | |
457 | static void handle_tx(struct vhost_net *net) | |
458 | { | |
2839400f | 459 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 460 | struct vhost_virtqueue *vq = &nvq->vq; |
98a527aa | 461 | unsigned out, in; |
d5675bd2 | 462 | int head; |
3a4d5c94 MT |
463 | struct msghdr msg = { |
464 | .msg_name = NULL, | |
465 | .msg_namelen = 0, | |
466 | .msg_control = NULL, | |
467 | .msg_controllen = 0, | |
3a4d5c94 MT |
468 | .msg_flags = MSG_DONTWAIT, |
469 | }; | |
470 | size_t len, total_len = 0; | |
70181d51 | 471 | int err; |
3a4d5c94 | 472 | size_t hdr_size; |
28457ee6 | 473 | struct socket *sock; |
fe729a57 | 474 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 475 | bool zcopy, zcopy_used; |
28457ee6 | 476 | |
2e26af79 AH |
477 | mutex_lock(&vq->mutex); |
478 | sock = vq->private_data; | |
3a4d5c94 | 479 | if (!sock) |
2e26af79 | 480 | goto out; |
3a4d5c94 | 481 | |
6b1e6cc7 JW |
482 | if (!vq_iotlb_prefetch(vq)) |
483 | goto out; | |
484 | ||
8ea8cf89 | 485 | vhost_disable_notify(&net->dev, vq); |
feb8892c | 486 | vhost_net_disable_vq(net, vq); |
3a4d5c94 | 487 | |
81f95a55 | 488 | hdr_size = nvq->vhost_hlen; |
2839400f | 489 | zcopy = nvq->ubufs; |
3a4d5c94 MT |
490 | |
491 | for (;;) { | |
bab632d6 MT |
492 | /* Release DMAs done buffers first */ |
493 | if (zcopy) | |
eaae8132 | 494 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 495 | |
f7c6be40 | 496 | |
03088137 JW |
497 | head = vhost_net_tx_get_vq_desc(net, vq, vq->iov, |
498 | ARRAY_SIZE(vq->iov), | |
499 | &out, &in); | |
d5675bd2 | 500 | /* On error, stop handling until the next kick. */ |
7b3384fc | 501 | if (unlikely(head < 0)) |
d5675bd2 | 502 | break; |
3a4d5c94 MT |
503 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
504 | if (head == vq->num) { | |
8ea8cf89 MT |
505 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
506 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
507 | continue; |
508 | } | |
509 | break; | |
510 | } | |
511 | if (in) { | |
512 | vq_err(vq, "Unexpected descriptor format for TX: " | |
513 | "out %d, int %d\n", out, in); | |
514 | break; | |
515 | } | |
516 | /* Skip header. TODO: support TSO. */ | |
3a4d5c94 | 517 | len = iov_length(vq->iov, out); |
c0371da6 | 518 | iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len); |
98a527aa | 519 | iov_iter_advance(&msg.msg_iter, hdr_size); |
3a4d5c94 | 520 | /* Sanity check */ |
01e97e65 | 521 | if (!msg_data_left(&msg)) { |
3a4d5c94 MT |
522 | vq_err(vq, "Unexpected header len for TX: " |
523 | "%zd expected %zd\n", | |
98a527aa | 524 | len, hdr_size); |
3a4d5c94 MT |
525 | break; |
526 | } | |
01e97e65 | 527 | len = msg_data_left(&msg); |
ce21a029 JW |
528 | |
529 | zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN | |
1e6f7453 | 530 | && !vhost_exceeds_maxpend(net) |
ce21a029 | 531 | && vhost_net_tx_select_zcopy(net); |
cedb9bdc | 532 | |
bab632d6 | 533 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 534 | if (zcopy_used) { |
ce21a029 JW |
535 | struct ubuf_info *ubuf; |
536 | ubuf = nvq->ubuf_info + nvq->upend_idx; | |
537 | ||
8b38694a | 538 | vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); |
ce21a029 JW |
539 | vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; |
540 | ubuf->callback = vhost_zerocopy_callback; | |
541 | ubuf->ctx = nvq->ubufs; | |
542 | ubuf->desc = nvq->upend_idx; | |
c1d1b437 | 543 | refcount_set(&ubuf->refcnt, 1); |
ce21a029 JW |
544 | msg.msg_control = ubuf; |
545 | msg.msg_controllen = sizeof(ubuf); | |
546 | ubufs = nvq->ubufs; | |
0ad8b480 | 547 | atomic_inc(&ubufs->refcount); |
2839400f | 548 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
ce21a029 | 549 | } else { |
4364d5f9 | 550 | msg.msg_control = NULL; |
ce21a029 JW |
551 | ubufs = NULL; |
552 | } | |
0ed005ce JW |
553 | |
554 | total_len += len; | |
555 | if (total_len < VHOST_NET_WEIGHT && | |
556 | !vhost_vq_avail_empty(&net->dev, vq) && | |
557 | likely(!vhost_exceeds_maxpend(net))) { | |
558 | msg.msg_flags |= MSG_MORE; | |
559 | } else { | |
560 | msg.msg_flags &= ~MSG_MORE; | |
561 | } | |
562 | ||
3a4d5c94 | 563 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
1b784140 | 564 | err = sock->ops->sendmsg(sock, &msg, len); |
3a4d5c94 | 565 | if (unlikely(err < 0)) { |
cedb9bdc | 566 | if (zcopy_used) { |
ce21a029 | 567 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
568 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
569 | % UIO_MAXIOV; | |
bab632d6 | 570 | } |
8dd014ad | 571 | vhost_discard_vq_desc(vq, 1); |
feb8892c | 572 | vhost_net_enable_vq(net, vq); |
3a4d5c94 MT |
573 | break; |
574 | } | |
575 | if (err != len) | |
95c0ec6a MT |
576 | pr_debug("Truncated TX packet: " |
577 | " len %d != %zd\n", err, len); | |
cedb9bdc | 578 | if (!zcopy_used) |
bab632d6 | 579 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 580 | else |
eaae8132 | 581 | vhost_zerocopy_signal_used(net, vq); |
eaae8132 | 582 | vhost_net_tx_packet(net); |
3a4d5c94 MT |
583 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
584 | vhost_poll_queue(&vq->poll); | |
585 | break; | |
586 | } | |
587 | } | |
2e26af79 | 588 | out: |
3a4d5c94 | 589 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
590 | } |
591 | ||
c67df11f | 592 | static int peek_head_len(struct vhost_net_virtqueue *rvq, struct sock *sk) |
8dd014ad DS |
593 | { |
594 | struct sk_buff *head; | |
595 | int len = 0; | |
783e3988 | 596 | unsigned long flags; |
8dd014ad | 597 | |
5990a305 | 598 | if (rvq->rx_ring) |
c67df11f | 599 | return vhost_net_buf_peek(rvq); |
1576d986 | 600 | |
783e3988 | 601 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 602 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 603 | if (likely(head)) { |
8dd014ad | 604 | len = head->len; |
df8a39de | 605 | if (skb_vlan_tag_present(head)) |
c53cff5e BG |
606 | len += VLAN_HLEN; |
607 | } | |
608 | ||
783e3988 | 609 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
610 | return len; |
611 | } | |
612 | ||
1576d986 JW |
613 | static int sk_has_rx_data(struct sock *sk) |
614 | { | |
615 | struct socket *sock = sk->sk_socket; | |
616 | ||
617 | if (sock->ops->peek_len) | |
618 | return sock->ops->peek_len(sock); | |
619 | ||
620 | return skb_queue_empty(&sk->sk_receive_queue); | |
621 | } | |
622 | ||
03088137 JW |
623 | static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk) |
624 | { | |
c67df11f | 625 | struct vhost_net_virtqueue *rvq = &net->vqs[VHOST_NET_VQ_RX]; |
03088137 JW |
626 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
627 | struct vhost_virtqueue *vq = &nvq->vq; | |
628 | unsigned long uninitialized_var(endtime); | |
c67df11f | 629 | int len = peek_head_len(rvq, sk); |
03088137 JW |
630 | |
631 | if (!len && vq->busyloop_timeout) { | |
632 | /* Both tx vq and rx socket were polled here */ | |
633 | mutex_lock(&vq->mutex); | |
634 | vhost_disable_notify(&net->dev, vq); | |
635 | ||
636 | preempt_disable(); | |
637 | endtime = busy_clock() + vq->busyloop_timeout; | |
638 | ||
639 | while (vhost_can_busy_poll(&net->dev, endtime) && | |
1576d986 | 640 | !sk_has_rx_data(sk) && |
03088137 | 641 | vhost_vq_avail_empty(&net->dev, vq)) |
f2f09a4c | 642 | cpu_relax(); |
03088137 JW |
643 | |
644 | preempt_enable(); | |
645 | ||
8b949bef | 646 | if (!vhost_vq_avail_empty(&net->dev, vq)) |
03088137 | 647 | vhost_poll_queue(&vq->poll); |
8b949bef JW |
648 | else if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
649 | vhost_disable_notify(&net->dev, vq); | |
650 | vhost_poll_queue(&vq->poll); | |
651 | } | |
652 | ||
03088137 JW |
653 | mutex_unlock(&vq->mutex); |
654 | ||
c67df11f | 655 | len = peek_head_len(rvq, sk); |
03088137 JW |
656 | } |
657 | ||
658 | return len; | |
659 | } | |
660 | ||
8dd014ad DS |
661 | /* This is a multi-buffer version of vhost_get_desc, that works if |
662 | * vq has read descriptors only. | |
663 | * @vq - the relevant virtqueue | |
664 | * @datalen - data length we'll be reading | |
665 | * @iovcount - returned count of io vectors we fill | |
666 | * @log - vhost log | |
667 | * @log_num - log offset | |
94249369 | 668 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
669 | * returns number of buffer heads allocated, negative on error |
670 | */ | |
671 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
672 | struct vring_used_elem *heads, | |
673 | int datalen, | |
674 | unsigned *iovcount, | |
675 | struct vhost_log *log, | |
94249369 JW |
676 | unsigned *log_num, |
677 | unsigned int quota) | |
8dd014ad DS |
678 | { |
679 | unsigned int out, in; | |
680 | int seg = 0; | |
681 | int headcount = 0; | |
682 | unsigned d; | |
683 | int r, nlogs = 0; | |
8b38694a MT |
684 | /* len is always initialized before use since we are always called with |
685 | * datalen > 0. | |
686 | */ | |
687 | u32 uninitialized_var(len); | |
8dd014ad | 688 | |
94249369 | 689 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 690 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
691 | r = -ENOBUFS; |
692 | goto err; | |
693 | } | |
47283bef | 694 | r = vhost_get_vq_desc(vq, vq->iov + seg, |
8dd014ad DS |
695 | ARRAY_SIZE(vq->iov) - seg, &out, |
696 | &in, log, log_num); | |
a39ee449 MT |
697 | if (unlikely(r < 0)) |
698 | goto err; | |
699 | ||
700 | d = r; | |
8dd014ad DS |
701 | if (d == vq->num) { |
702 | r = 0; | |
703 | goto err; | |
704 | } | |
705 | if (unlikely(out || in <= 0)) { | |
706 | vq_err(vq, "unexpected descriptor format for RX: " | |
707 | "out %d, in %d\n", out, in); | |
708 | r = -EINVAL; | |
709 | goto err; | |
710 | } | |
711 | if (unlikely(log)) { | |
712 | nlogs += *log_num; | |
713 | log += *log_num; | |
714 | } | |
8b38694a MT |
715 | heads[headcount].id = cpu_to_vhost32(vq, d); |
716 | len = iov_length(vq->iov + seg, in); | |
717 | heads[headcount].len = cpu_to_vhost32(vq, len); | |
718 | datalen -= len; | |
8dd014ad DS |
719 | ++headcount; |
720 | seg += in; | |
721 | } | |
99975cc6 | 722 | heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); |
8dd014ad DS |
723 | *iovcount = seg; |
724 | if (unlikely(log)) | |
725 | *log_num = nlogs; | |
d8316f39 MT |
726 | |
727 | /* Detect overrun */ | |
728 | if (unlikely(datalen > 0)) { | |
729 | r = UIO_MAXIOV + 1; | |
730 | goto err; | |
731 | } | |
8dd014ad DS |
732 | return headcount; |
733 | err: | |
734 | vhost_discard_vq_desc(vq, headcount); | |
735 | return r; | |
736 | } | |
737 | ||
3a4d5c94 MT |
738 | /* Expects to be always run from workqueue - which acts as |
739 | * read-size critical section for our kind of RCU. */ | |
94249369 | 740 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 741 | { |
81f95a55 MT |
742 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
743 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
744 | unsigned uninitialized_var(in), log; |
745 | struct vhost_log *vq_log; | |
746 | struct msghdr msg = { | |
747 | .msg_name = NULL, | |
748 | .msg_namelen = 0, | |
749 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
750 | .msg_controllen = 0, | |
8dd014ad DS |
751 | .msg_flags = MSG_DONTWAIT, |
752 | }; | |
0960b641 JW |
753 | struct virtio_net_hdr hdr = { |
754 | .flags = 0, | |
755 | .gso_type = VIRTIO_NET_HDR_GSO_NONE | |
8dd014ad | 756 | }; |
8dd014ad | 757 | size_t total_len = 0; |
910a578f | 758 | int err, mergeable; |
e2b3b35e | 759 | s16 headcount, nheads = 0; |
8dd014ad DS |
760 | size_t vhost_hlen, sock_hlen; |
761 | size_t vhost_len, sock_len; | |
2e26af79 | 762 | struct socket *sock; |
ba7438ae | 763 | struct iov_iter fixup; |
0960b641 | 764 | __virtio16 num_buffers; |
8dd014ad | 765 | |
8dd014ad | 766 | mutex_lock(&vq->mutex); |
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 | |
03088137 | 784 | while ((sock_len = vhost_net_rx_peek_head_len(net, sock->sk))) { |
8dd014ad DS |
785 | sock_len += sock_hlen; |
786 | vhost_len = sock_len + vhost_hlen; | |
e2b3b35e | 787 | headcount = get_rx_bufs(vq, vq->heads + nheads, vhost_len, |
94249369 JW |
788 | &in, vq_log, &log, |
789 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
790 | /* On error, stop handling until the next kick. */ |
791 | if (unlikely(headcount < 0)) | |
8241a1e4 | 792 | goto out; |
8dd014ad DS |
793 | /* OK, now we need to know about added descriptors. */ |
794 | if (!headcount) { | |
8ea8cf89 | 795 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
796 | /* They have slipped one in as we were |
797 | * doing that: check again. */ | |
8ea8cf89 | 798 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
799 | continue; |
800 | } | |
801 | /* Nothing new? Wait for eventfd to tell us | |
802 | * they refilled. */ | |
8241a1e4 | 803 | goto out; |
8dd014ad | 804 | } |
5990a305 | 805 | if (nvq->rx_ring) |
6e474083 WX |
806 | msg.msg_control = vhost_net_buf_consume(&nvq->rxq); |
807 | /* On overrun, truncate and discard */ | |
808 | if (unlikely(headcount > UIO_MAXIOV)) { | |
809 | iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); | |
810 | err = sock->ops->recvmsg(sock, &msg, | |
811 | 1, MSG_DONTWAIT | MSG_TRUNC); | |
812 | pr_debug("Discarded rx packet: len %zd\n", sock_len); | |
813 | continue; | |
814 | } | |
8dd014ad | 815 | /* We don't need to be notified again. */ |
ba7438ae AV |
816 | iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len); |
817 | fixup = msg.msg_iter; | |
818 | if (unlikely((vhost_hlen))) { | |
819 | /* We will supply the header ourselves | |
820 | * TODO: support TSO. | |
821 | */ | |
822 | iov_iter_advance(&msg.msg_iter, vhost_hlen); | |
ba7438ae | 823 | } |
1b784140 | 824 | err = sock->ops->recvmsg(sock, &msg, |
8dd014ad DS |
825 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
826 | /* Userspace might have consumed the packet meanwhile: | |
827 | * it's not supposed to do this usually, but might be hard | |
828 | * to prevent. Discard data we got (if any) and keep going. */ | |
829 | if (unlikely(err != sock_len)) { | |
830 | pr_debug("Discarded rx packet: " | |
831 | " len %d, expected %zd\n", err, sock_len); | |
832 | vhost_discard_vq_desc(vq, headcount); | |
833 | continue; | |
834 | } | |
ba7438ae | 835 | /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ |
4c5a8442 MT |
836 | if (unlikely(vhost_hlen)) { |
837 | if (copy_to_iter(&hdr, sizeof(hdr), | |
838 | &fixup) != sizeof(hdr)) { | |
839 | vq_err(vq, "Unable to write vnet_hdr " | |
840 | "at addr %p\n", vq->iov->iov_base); | |
8241a1e4 | 841 | goto out; |
4c5a8442 MT |
842 | } |
843 | } else { | |
844 | /* Header came from socket; we'll need to patch | |
845 | * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF | |
846 | */ | |
847 | iov_iter_advance(&fixup, sizeof(hdr)); | |
8dd014ad DS |
848 | } |
849 | /* TODO: Should check and handle checksum. */ | |
5201aa49 | 850 | |
0960b641 | 851 | num_buffers = cpu_to_vhost16(vq, headcount); |
cfbdab95 | 852 | if (likely(mergeable) && |
0d79a493 MT |
853 | copy_to_iter(&num_buffers, sizeof num_buffers, |
854 | &fixup) != sizeof num_buffers) { | |
8dd014ad DS |
855 | vq_err(vq, "Failed num_buffers write"); |
856 | vhost_discard_vq_desc(vq, headcount); | |
8241a1e4 | 857 | goto out; |
8dd014ad | 858 | } |
e2b3b35e JW |
859 | nheads += headcount; |
860 | if (nheads > VHOST_RX_BATCH) { | |
861 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
862 | nheads); | |
863 | nheads = 0; | |
864 | } | |
8dd014ad DS |
865 | if (unlikely(vq_log)) |
866 | vhost_log_write(vq, vq_log, log, vhost_len); | |
867 | total_len += vhost_len; | |
868 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
869 | vhost_poll_queue(&vq->poll); | |
8241a1e4 | 870 | goto out; |
8dd014ad DS |
871 | } |
872 | } | |
8241a1e4 | 873 | vhost_net_enable_vq(net, vq); |
2e26af79 | 874 | out: |
e2b3b35e JW |
875 | if (nheads) |
876 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
877 | nheads); | |
8dd014ad | 878 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
879 | } |
880 | ||
c23f3445 | 881 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 882 | { |
c23f3445 TH |
883 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
884 | poll.work); | |
885 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
886 | ||
3a4d5c94 MT |
887 | handle_tx(net); |
888 | } | |
889 | ||
c23f3445 | 890 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 891 | { |
c23f3445 TH |
892 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
893 | poll.work); | |
894 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
895 | ||
3a4d5c94 MT |
896 | handle_rx(net); |
897 | } | |
898 | ||
c23f3445 | 899 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 900 | { |
c23f3445 TH |
901 | struct vhost_net *net = container_of(work, struct vhost_net, |
902 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
903 | handle_tx(net); |
904 | } | |
905 | ||
c23f3445 | 906 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 907 | { |
c23f3445 TH |
908 | struct vhost_net *net = container_of(work, struct vhost_net, |
909 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
910 | handle_rx(net); |
911 | } | |
912 | ||
913 | static int vhost_net_open(struct inode *inode, struct file *f) | |
914 | { | |
23cc5a99 | 915 | struct vhost_net *n; |
c23f3445 | 916 | struct vhost_dev *dev; |
3ab2e420 | 917 | struct vhost_virtqueue **vqs; |
5990a305 | 918 | void **queue; |
59566b6e | 919 | int i; |
c23f3445 | 920 | |
dcda9b04 | 921 | n = kvmalloc(sizeof *n, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
6c5ab651 MH |
922 | if (!n) |
923 | return -ENOMEM; | |
3ab2e420 AH |
924 | vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
925 | if (!vqs) { | |
d04257b0 | 926 | kvfree(n); |
3ab2e420 AH |
927 | return -ENOMEM; |
928 | } | |
c23f3445 | 929 | |
5990a305 | 930 | queue = kmalloc_array(VHOST_RX_BATCH, sizeof(void *), |
c67df11f JW |
931 | GFP_KERNEL); |
932 | if (!queue) { | |
933 | kfree(vqs); | |
934 | kvfree(n); | |
935 | return -ENOMEM; | |
936 | } | |
937 | n->vqs[VHOST_NET_VQ_RX].rxq.queue = queue; | |
938 | ||
c23f3445 | 939 | dev = &n->dev; |
3ab2e420 AH |
940 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
941 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
942 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
943 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
944 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
945 | n->vqs[i].ubufs = NULL; | |
946 | n->vqs[i].ubuf_info = NULL; | |
947 | n->vqs[i].upend_idx = 0; | |
948 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
949 | n->vqs[i].vhost_hlen = 0; |
950 | n->vqs[i].sock_hlen = 0; | |
c67df11f | 951 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f | 952 | } |
59566b6e | 953 | vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 | 954 | |
a9a08845 LT |
955 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, EPOLLOUT, dev); |
956 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, EPOLLIN, dev); | |
3a4d5c94 MT |
957 | |
958 | f->private_data = n; | |
959 | ||
960 | return 0; | |
961 | } | |
962 | ||
3a4d5c94 MT |
963 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, |
964 | struct vhost_virtqueue *vq) | |
965 | { | |
966 | struct socket *sock; | |
c67df11f JW |
967 | struct vhost_net_virtqueue *nvq = |
968 | container_of(vq, struct vhost_net_virtqueue, vq); | |
3a4d5c94 MT |
969 | |
970 | mutex_lock(&vq->mutex); | |
22fa90c7 | 971 | sock = vq->private_data; |
3a4d5c94 | 972 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 973 | vq->private_data = NULL; |
c67df11f | 974 | vhost_net_buf_unproduce(nvq); |
3a4d5c94 MT |
975 | mutex_unlock(&vq->mutex); |
976 | return sock; | |
977 | } | |
978 | ||
979 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
980 | struct socket **rx_sock) | |
981 | { | |
3ab2e420 AH |
982 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
983 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
984 | } |
985 | ||
986 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
987 | { | |
988 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 989 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
990 | } |
991 | ||
992 | static void vhost_net_flush(struct vhost_net *n) | |
993 | { | |
994 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
995 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 996 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 997 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 998 | n->tx_flush = true; |
3ab2e420 | 999 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1000 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 1001 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 1002 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1003 | n->tx_flush = false; |
0ad8b480 | 1004 | atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); |
3ab2e420 | 1005 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1006 | } |
3a4d5c94 MT |
1007 | } |
1008 | ||
1009 | static int vhost_net_release(struct inode *inode, struct file *f) | |
1010 | { | |
1011 | struct vhost_net *n = f->private_data; | |
1012 | struct socket *tx_sock; | |
1013 | struct socket *rx_sock; | |
1014 | ||
1015 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
1016 | vhost_net_flush(n); | |
b211616d | 1017 | vhost_dev_stop(&n->dev); |
f6f93f75 | 1018 | vhost_dev_cleanup(&n->dev); |
81f95a55 | 1019 | vhost_net_vq_reset(n); |
3a4d5c94 | 1020 | if (tx_sock) |
09aaacf0 | 1021 | sockfd_put(tx_sock); |
3a4d5c94 | 1022 | if (rx_sock) |
09aaacf0 | 1023 | sockfd_put(rx_sock); |
b0c057ca MT |
1024 | /* Make sure no callbacks are outstanding */ |
1025 | synchronize_rcu_bh(); | |
3a4d5c94 MT |
1026 | /* We do an extra flush before freeing memory, |
1027 | * since jobs can re-queue themselves. */ | |
1028 | vhost_net_flush(n); | |
c67df11f | 1029 | kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue); |
3ab2e420 | 1030 | kfree(n->dev.vqs); |
d04257b0 | 1031 | kvfree(n); |
3a4d5c94 MT |
1032 | return 0; |
1033 | } | |
1034 | ||
1035 | static struct socket *get_raw_socket(int fd) | |
1036 | { | |
1037 | struct { | |
1038 | struct sockaddr_ll sa; | |
1039 | char buf[MAX_ADDR_LEN]; | |
1040 | } uaddr; | |
1041 | int uaddr_len = sizeof uaddr, r; | |
1042 | struct socket *sock = sockfd_lookup(fd, &r); | |
d47effe1 | 1043 | |
3a4d5c94 MT |
1044 | if (!sock) |
1045 | return ERR_PTR(-ENOTSOCK); | |
1046 | ||
1047 | /* Parameter checking */ | |
1048 | if (sock->sk->sk_type != SOCK_RAW) { | |
1049 | r = -ESOCKTNOSUPPORT; | |
1050 | goto err; | |
1051 | } | |
1052 | ||
1053 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
1054 | &uaddr_len, 0); | |
1055 | if (r) | |
1056 | goto err; | |
1057 | ||
1058 | if (uaddr.sa.sll_family != AF_PACKET) { | |
1059 | r = -EPFNOSUPPORT; | |
1060 | goto err; | |
1061 | } | |
1062 | return sock; | |
1063 | err: | |
09aaacf0 | 1064 | sockfd_put(sock); |
3a4d5c94 MT |
1065 | return ERR_PTR(r); |
1066 | } | |
1067 | ||
5990a305 | 1068 | static struct ptr_ring *get_tap_ptr_ring(int fd) |
c67df11f | 1069 | { |
5990a305 | 1070 | struct ptr_ring *ring; |
c67df11f JW |
1071 | struct file *file = fget(fd); |
1072 | ||
1073 | if (!file) | |
1074 | return NULL; | |
5990a305 JW |
1075 | ring = tun_get_tx_ring(file); |
1076 | if (!IS_ERR(ring)) | |
c67df11f | 1077 | goto out; |
5990a305 JW |
1078 | ring = tap_get_ptr_ring(file); |
1079 | if (!IS_ERR(ring)) | |
c67df11f | 1080 | goto out; |
5990a305 | 1081 | ring = NULL; |
c67df11f JW |
1082 | out: |
1083 | fput(file); | |
5990a305 | 1084 | return ring; |
c67df11f JW |
1085 | } |
1086 | ||
501c774c | 1087 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
1088 | { |
1089 | struct file *file = fget(fd); | |
1090 | struct socket *sock; | |
d47effe1 | 1091 | |
3a4d5c94 MT |
1092 | if (!file) |
1093 | return ERR_PTR(-EBADF); | |
1094 | sock = tun_get_socket(file); | |
501c774c AB |
1095 | if (!IS_ERR(sock)) |
1096 | return sock; | |
635b8c8e | 1097 | sock = tap_get_socket(file); |
3a4d5c94 MT |
1098 | if (IS_ERR(sock)) |
1099 | fput(file); | |
1100 | return sock; | |
1101 | } | |
1102 | ||
1103 | static struct socket *get_socket(int fd) | |
1104 | { | |
1105 | struct socket *sock; | |
d47effe1 | 1106 | |
3a4d5c94 MT |
1107 | /* special case to disable backend */ |
1108 | if (fd == -1) | |
1109 | return NULL; | |
1110 | sock = get_raw_socket(fd); | |
1111 | if (!IS_ERR(sock)) | |
1112 | return sock; | |
501c774c | 1113 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
1114 | if (!IS_ERR(sock)) |
1115 | return sock; | |
1116 | return ERR_PTR(-ENOTSOCK); | |
1117 | } | |
1118 | ||
1119 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
1120 | { | |
1121 | struct socket *sock, *oldsock; | |
1122 | struct vhost_virtqueue *vq; | |
2839400f | 1123 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 1124 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
1125 | int r; |
1126 | ||
1127 | mutex_lock(&n->dev.mutex); | |
1128 | r = vhost_dev_check_owner(&n->dev); | |
1129 | if (r) | |
1130 | goto err; | |
1131 | ||
1132 | if (index >= VHOST_NET_VQ_MAX) { | |
1133 | r = -ENOBUFS; | |
1134 | goto err; | |
1135 | } | |
3ab2e420 | 1136 | vq = &n->vqs[index].vq; |
2839400f | 1137 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
1138 | mutex_lock(&vq->mutex); |
1139 | ||
1140 | /* Verify that ring has been setup correctly. */ | |
1141 | if (!vhost_vq_access_ok(vq)) { | |
1142 | r = -EFAULT; | |
1dace8c8 | 1143 | goto err_vq; |
3a4d5c94 MT |
1144 | } |
1145 | sock = get_socket(fd); | |
1146 | if (IS_ERR(sock)) { | |
1147 | r = PTR_ERR(sock); | |
1dace8c8 | 1148 | goto err_vq; |
3a4d5c94 MT |
1149 | } |
1150 | ||
1151 | /* start polling new socket */ | |
22fa90c7 | 1152 | oldsock = vq->private_data; |
11fe8839 | 1153 | if (sock != oldsock) { |
fe729a57 AH |
1154 | ubufs = vhost_net_ubuf_alloc(vq, |
1155 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
1156 | if (IS_ERR(ubufs)) { |
1157 | r = PTR_ERR(ubufs); | |
1158 | goto err_ubufs; | |
1159 | } | |
692a998b | 1160 | |
d47effe1 | 1161 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 1162 | vq->private_data = sock; |
c67df11f JW |
1163 | vhost_net_buf_unproduce(nvq); |
1164 | if (index == VHOST_NET_VQ_RX) | |
5990a305 | 1165 | nvq->rx_ring = get_tap_ptr_ring(fd); |
80f7d030 | 1166 | r = vhost_vq_init_access(vq); |
f59281da | 1167 | if (r) |
692a998b | 1168 | goto err_used; |
2b8b328b JW |
1169 | r = vhost_net_enable_vq(n, vq); |
1170 | if (r) | |
1171 | goto err_used; | |
692a998b | 1172 | |
2839400f AH |
1173 | oldubufs = nvq->ubufs; |
1174 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
1175 | |
1176 | n->tx_packets = 0; | |
1177 | n->tx_zcopy_err = 0; | |
1280c27f | 1178 | n->tx_flush = false; |
dd1f4078 | 1179 | } |
3a4d5c94 | 1180 | |
1680e906 MT |
1181 | mutex_unlock(&vq->mutex); |
1182 | ||
c047e5f3 | 1183 | if (oldubufs) { |
c38e39c3 | 1184 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 1185 | mutex_lock(&vq->mutex); |
eaae8132 | 1186 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
1187 | mutex_unlock(&vq->mutex); |
1188 | } | |
bab632d6 | 1189 | |
3a4d5c94 MT |
1190 | if (oldsock) { |
1191 | vhost_net_flush_vq(n, index); | |
09aaacf0 | 1192 | sockfd_put(oldsock); |
3a4d5c94 | 1193 | } |
1dace8c8 | 1194 | |
1680e906 MT |
1195 | mutex_unlock(&n->dev.mutex); |
1196 | return 0; | |
1197 | ||
692a998b | 1198 | err_used: |
22fa90c7 | 1199 | vq->private_data = oldsock; |
692a998b JW |
1200 | vhost_net_enable_vq(n, vq); |
1201 | if (ubufs) | |
c38e39c3 | 1202 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 | 1203 | err_ubufs: |
09aaacf0 | 1204 | sockfd_put(sock); |
1dace8c8 JD |
1205 | err_vq: |
1206 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
1207 | err: |
1208 | mutex_unlock(&n->dev.mutex); | |
1209 | return r; | |
1210 | } | |
1211 | ||
1212 | static long vhost_net_reset_owner(struct vhost_net *n) | |
1213 | { | |
1214 | struct socket *tx_sock = NULL; | |
1215 | struct socket *rx_sock = NULL; | |
1216 | long err; | |
a9709d68 | 1217 | struct vhost_umem *umem; |
d47effe1 | 1218 | |
3a4d5c94 MT |
1219 | mutex_lock(&n->dev.mutex); |
1220 | err = vhost_dev_check_owner(&n->dev); | |
1221 | if (err) | |
1222 | goto done; | |
a9709d68 JW |
1223 | umem = vhost_dev_reset_owner_prepare(); |
1224 | if (!umem) { | |
150b9e51 MT |
1225 | err = -ENOMEM; |
1226 | goto done; | |
1227 | } | |
3a4d5c94 MT |
1228 | vhost_net_stop(n, &tx_sock, &rx_sock); |
1229 | vhost_net_flush(n); | |
4cd87951 | 1230 | vhost_dev_stop(&n->dev); |
a9709d68 | 1231 | vhost_dev_reset_owner(&n->dev, umem); |
81f95a55 | 1232 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
1233 | done: |
1234 | mutex_unlock(&n->dev.mutex); | |
1235 | if (tx_sock) | |
09aaacf0 | 1236 | sockfd_put(tx_sock); |
3a4d5c94 | 1237 | if (rx_sock) |
09aaacf0 | 1238 | sockfd_put(rx_sock); |
3a4d5c94 MT |
1239 | return err; |
1240 | } | |
1241 | ||
1242 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
1243 | { | |
8dd014ad | 1244 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1245 | int i; |
8dd014ad | 1246 | |
e4fca7d6 MT |
1247 | hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
1248 | (1ULL << VIRTIO_F_VERSION_1))) ? | |
8dd014ad DS |
1249 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
1250 | sizeof(struct virtio_net_hdr); | |
1251 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1252 | /* vhost provides vnet_hdr */ | |
1253 | vhost_hlen = hdr_len; | |
1254 | sock_hlen = 0; | |
1255 | } else { | |
1256 | /* socket provides vnet_hdr */ | |
1257 | vhost_hlen = 0; | |
1258 | sock_hlen = hdr_len; | |
1259 | } | |
3a4d5c94 MT |
1260 | mutex_lock(&n->dev.mutex); |
1261 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
6b1e6cc7 JW |
1262 | !vhost_log_access_ok(&n->dev)) |
1263 | goto out_unlock; | |
1264 | ||
1265 | if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) { | |
1266 | if (vhost_init_device_iotlb(&n->dev, true)) | |
1267 | goto out_unlock; | |
3a4d5c94 | 1268 | } |
6b1e6cc7 | 1269 | |
3a4d5c94 | 1270 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
3ab2e420 | 1271 | mutex_lock(&n->vqs[i].vq.mutex); |
ea16c514 | 1272 | n->vqs[i].vq.acked_features = features; |
81f95a55 MT |
1273 | n->vqs[i].vhost_hlen = vhost_hlen; |
1274 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1275 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 | 1276 | } |
3a4d5c94 MT |
1277 | mutex_unlock(&n->dev.mutex); |
1278 | return 0; | |
6b1e6cc7 JW |
1279 | |
1280 | out_unlock: | |
1281 | mutex_unlock(&n->dev.mutex); | |
1282 | return -EFAULT; | |
3a4d5c94 MT |
1283 | } |
1284 | ||
b1ad8496 AH |
1285 | static long vhost_net_set_owner(struct vhost_net *n) |
1286 | { | |
1287 | int r; | |
1288 | ||
1289 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1290 | if (vhost_dev_has_owner(&n->dev)) { |
1291 | r = -EBUSY; | |
1292 | goto out; | |
1293 | } | |
b1ad8496 AH |
1294 | r = vhost_net_set_ubuf_info(n); |
1295 | if (r) | |
1296 | goto out; | |
1297 | r = vhost_dev_set_owner(&n->dev); | |
1298 | if (r) | |
1299 | vhost_net_clear_ubuf_info(n); | |
1300 | vhost_net_flush(n); | |
1301 | out: | |
1302 | mutex_unlock(&n->dev.mutex); | |
1303 | return r; | |
1304 | } | |
1305 | ||
3a4d5c94 MT |
1306 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1307 | unsigned long arg) | |
1308 | { | |
1309 | struct vhost_net *n = f->private_data; | |
1310 | void __user *argp = (void __user *)arg; | |
1311 | u64 __user *featurep = argp; | |
1312 | struct vhost_vring_file backend; | |
1313 | u64 features; | |
1314 | int r; | |
d47effe1 | 1315 | |
3a4d5c94 MT |
1316 | switch (ioctl) { |
1317 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1318 | if (copy_from_user(&backend, argp, sizeof backend)) |
1319 | return -EFAULT; | |
3a4d5c94 MT |
1320 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1321 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1322 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1323 | if (copy_to_user(featurep, &features, sizeof features)) |
1324 | return -EFAULT; | |
1325 | return 0; | |
3a4d5c94 | 1326 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1327 | if (copy_from_user(&features, featurep, sizeof features)) |
1328 | return -EFAULT; | |
0dd05a3b | 1329 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1330 | return -EOPNOTSUPP; |
1331 | return vhost_net_set_features(n, features); | |
1332 | case VHOST_RESET_OWNER: | |
1333 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1334 | case VHOST_SET_OWNER: |
1335 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1336 | default: |
1337 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1338 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1339 | if (r == -ENOIOCTLCMD) | |
1340 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1341 | else | |
1342 | vhost_net_flush(n); | |
3a4d5c94 MT |
1343 | mutex_unlock(&n->dev.mutex); |
1344 | return r; | |
1345 | } | |
1346 | } | |
1347 | ||
1348 | #ifdef CONFIG_COMPAT | |
1349 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1350 | unsigned long arg) | |
1351 | { | |
1352 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1353 | } | |
1354 | #endif | |
1355 | ||
6b1e6cc7 JW |
1356 | static ssize_t vhost_net_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1357 | { | |
1358 | struct file *file = iocb->ki_filp; | |
1359 | struct vhost_net *n = file->private_data; | |
1360 | struct vhost_dev *dev = &n->dev; | |
1361 | int noblock = file->f_flags & O_NONBLOCK; | |
1362 | ||
1363 | return vhost_chr_read_iter(dev, to, noblock); | |
1364 | } | |
1365 | ||
1366 | static ssize_t vhost_net_chr_write_iter(struct kiocb *iocb, | |
1367 | struct iov_iter *from) | |
1368 | { | |
1369 | struct file *file = iocb->ki_filp; | |
1370 | struct vhost_net *n = file->private_data; | |
1371 | struct vhost_dev *dev = &n->dev; | |
1372 | ||
1373 | return vhost_chr_write_iter(dev, from); | |
1374 | } | |
1375 | ||
afc9a42b | 1376 | static __poll_t vhost_net_chr_poll(struct file *file, poll_table *wait) |
6b1e6cc7 JW |
1377 | { |
1378 | struct vhost_net *n = file->private_data; | |
1379 | struct vhost_dev *dev = &n->dev; | |
1380 | ||
1381 | return vhost_chr_poll(file, dev, wait); | |
1382 | } | |
1383 | ||
373a83a6 | 1384 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1385 | .owner = THIS_MODULE, |
1386 | .release = vhost_net_release, | |
6b1e6cc7 JW |
1387 | .read_iter = vhost_net_chr_read_iter, |
1388 | .write_iter = vhost_net_chr_write_iter, | |
1389 | .poll = vhost_net_chr_poll, | |
3a4d5c94 MT |
1390 | .unlocked_ioctl = vhost_net_ioctl, |
1391 | #ifdef CONFIG_COMPAT | |
1392 | .compat_ioctl = vhost_net_compat_ioctl, | |
1393 | #endif | |
1394 | .open = vhost_net_open, | |
6038f373 | 1395 | .llseek = noop_llseek, |
3a4d5c94 MT |
1396 | }; |
1397 | ||
1398 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1399 | .minor = VHOST_NET_MINOR, |
1400 | .name = "vhost-net", | |
1401 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1402 | }; |
1403 | ||
a8d3782f | 1404 | static int vhost_net_init(void) |
3a4d5c94 | 1405 | { |
bab632d6 | 1406 | if (experimental_zcopytx) |
fe729a57 | 1407 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1408 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1409 | } |
1410 | module_init(vhost_net_init); | |
1411 | ||
a8d3782f | 1412 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1413 | { |
1414 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1415 | } |
1416 | module_exit(vhost_net_exit); | |
1417 | ||
1418 | MODULE_VERSION("0.0.1"); | |
1419 | MODULE_LICENSE("GPL v2"); | |
1420 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1421 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1422 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1423 | MODULE_ALIAS("devname:vhost-net"); |