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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> | |
18 | #include <linux/rcupdate.h> | |
19 | #include <linux/file.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
3a4d5c94 MT |
21 | |
22 | #include <linux/net.h> | |
23 | #include <linux/if_packet.h> | |
24 | #include <linux/if_arp.h> | |
25 | #include <linux/if_tun.h> | |
501c774c | 26 | #include <linux/if_macvlan.h> |
c53cff5e | 27 | #include <linux/if_vlan.h> |
3a4d5c94 MT |
28 | |
29 | #include <net/sock.h> | |
30 | ||
31 | #include "vhost.h" | |
32 | ||
f9611c43 | 33 | static int experimental_zcopytx = 1; |
bab632d6 | 34 | module_param(experimental_zcopytx, int, 0444); |
f9611c43 MT |
35 | MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;" |
36 | " 1 -Enable; 0 - Disable"); | |
bab632d6 | 37 | |
3a4d5c94 MT |
38 | /* Max number of bytes transferred before requeueing the job. |
39 | * Using this limit prevents one virtqueue from starving others. */ | |
40 | #define VHOST_NET_WEIGHT 0x80000 | |
41 | ||
bab632d6 MT |
42 | /* MAX number of TX used buffers for outstanding zerocopy */ |
43 | #define VHOST_MAX_PEND 128 | |
44 | #define VHOST_GOODCOPY_LEN 256 | |
45 | ||
eaae8132 MT |
46 | /* |
47 | * For transmit, used buffer len is unused; we override it to track buffer | |
48 | * status internally; used for zerocopy tx only. | |
49 | */ | |
50 | /* Lower device DMA failed */ | |
51 | #define VHOST_DMA_FAILED_LEN 3 | |
52 | /* Lower device DMA done */ | |
53 | #define VHOST_DMA_DONE_LEN 2 | |
54 | /* Lower device DMA in progress */ | |
55 | #define VHOST_DMA_IN_PROGRESS 1 | |
56 | /* Buffer unused */ | |
57 | #define VHOST_DMA_CLEAR_LEN 0 | |
58 | ||
59 | #define VHOST_DMA_IS_DONE(len) ((len) >= VHOST_DMA_DONE_LEN) | |
60 | ||
3a4d5c94 MT |
61 | enum { |
62 | VHOST_NET_VQ_RX = 0, | |
63 | VHOST_NET_VQ_TX = 1, | |
64 | VHOST_NET_VQ_MAX = 2, | |
65 | }; | |
66 | ||
67 | enum vhost_net_poll_state { | |
68 | VHOST_NET_POLL_DISABLED = 0, | |
69 | VHOST_NET_POLL_STARTED = 1, | |
70 | VHOST_NET_POLL_STOPPED = 2, | |
71 | }; | |
72 | ||
73 | struct vhost_net { | |
74 | struct vhost_dev dev; | |
75 | struct vhost_virtqueue vqs[VHOST_NET_VQ_MAX]; | |
76 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; | |
77 | /* Tells us whether we are polling a socket for TX. | |
78 | * We only do this when socket buffer fills up. | |
79 | * Protected by tx vq lock. */ | |
80 | enum vhost_net_poll_state tx_poll_state; | |
eaae8132 MT |
81 | /* Number of TX recently submitted. |
82 | * Protected by tx vq lock. */ | |
83 | unsigned tx_packets; | |
84 | /* Number of times zerocopy TX recently failed. | |
85 | * Protected by tx vq lock. */ | |
86 | unsigned tx_zcopy_err; | |
1280c27f MT |
87 | /* Flush in progress. Protected by tx vq lock. */ |
88 | bool tx_flush; | |
3a4d5c94 MT |
89 | }; |
90 | ||
eaae8132 MT |
91 | static void vhost_net_tx_packet(struct vhost_net *net) |
92 | { | |
93 | ++net->tx_packets; | |
94 | if (net->tx_packets < 1024) | |
95 | return; | |
96 | net->tx_packets = 0; | |
97 | net->tx_zcopy_err = 0; | |
98 | } | |
99 | ||
100 | static void vhost_net_tx_err(struct vhost_net *net) | |
101 | { | |
102 | ++net->tx_zcopy_err; | |
103 | } | |
104 | ||
105 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
106 | { | |
1280c27f MT |
107 | /* TX flush waits for outstanding DMAs to be done. |
108 | * Don't start new DMAs. | |
109 | */ | |
110 | return !net->tx_flush && | |
111 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
112 | } |
113 | ||
bab632d6 MT |
114 | static bool vhost_sock_zcopy(struct socket *sock) |
115 | { | |
116 | return unlikely(experimental_zcopytx) && | |
117 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
118 | } | |
119 | ||
3a4d5c94 MT |
120 | /* Pop first len bytes from iovec. Return number of segments used. */ |
121 | static int move_iovec_hdr(struct iovec *from, struct iovec *to, | |
122 | size_t len, int iov_count) | |
123 | { | |
124 | int seg = 0; | |
125 | size_t size; | |
d47effe1 | 126 | |
3a4d5c94 MT |
127 | while (len && seg < iov_count) { |
128 | size = min(from->iov_len, len); | |
129 | to->iov_base = from->iov_base; | |
130 | to->iov_len = size; | |
131 | from->iov_len -= size; | |
132 | from->iov_base += size; | |
133 | len -= size; | |
134 | ++from; | |
135 | ++to; | |
136 | ++seg; | |
137 | } | |
138 | return seg; | |
139 | } | |
8dd014ad DS |
140 | /* Copy iovec entries for len bytes from iovec. */ |
141 | static void copy_iovec_hdr(const struct iovec *from, struct iovec *to, | |
142 | size_t len, int iovcount) | |
143 | { | |
144 | int seg = 0; | |
145 | size_t size; | |
d47effe1 | 146 | |
8dd014ad DS |
147 | while (len && seg < iovcount) { |
148 | size = min(from->iov_len, len); | |
149 | to->iov_base = from->iov_base; | |
150 | to->iov_len = size; | |
151 | len -= size; | |
152 | ++from; | |
153 | ++to; | |
154 | ++seg; | |
155 | } | |
156 | } | |
3a4d5c94 MT |
157 | |
158 | /* Caller must have TX VQ lock */ | |
159 | static void tx_poll_stop(struct vhost_net *net) | |
160 | { | |
161 | if (likely(net->tx_poll_state != VHOST_NET_POLL_STARTED)) | |
162 | return; | |
163 | vhost_poll_stop(net->poll + VHOST_NET_VQ_TX); | |
164 | net->tx_poll_state = VHOST_NET_POLL_STOPPED; | |
165 | } | |
166 | ||
167 | /* Caller must have TX VQ lock */ | |
168 | static void tx_poll_start(struct vhost_net *net, struct socket *sock) | |
169 | { | |
170 | if (unlikely(net->tx_poll_state != VHOST_NET_POLL_STOPPED)) | |
171 | return; | |
172 | vhost_poll_start(net->poll + VHOST_NET_VQ_TX, sock->file); | |
173 | net->tx_poll_state = VHOST_NET_POLL_STARTED; | |
174 | } | |
175 | ||
b211616d MT |
176 | /* In case of DMA done not in order in lower device driver for some reason. |
177 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
178 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
179 | * guest used idx. | |
180 | */ | |
eaae8132 MT |
181 | static int vhost_zerocopy_signal_used(struct vhost_net *net, |
182 | struct vhost_virtqueue *vq) | |
b211616d MT |
183 | { |
184 | int i; | |
185 | int j = 0; | |
186 | ||
187 | for (i = vq->done_idx; i != vq->upend_idx; i = (i + 1) % UIO_MAXIOV) { | |
eaae8132 MT |
188 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
189 | vhost_net_tx_err(net); | |
b211616d MT |
190 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
191 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
192 | vhost_add_used_and_signal(vq->dev, vq, | |
193 | vq->heads[i].id, 0); | |
194 | ++j; | |
195 | } else | |
196 | break; | |
197 | } | |
198 | if (j) | |
199 | vq->done_idx = i; | |
200 | return j; | |
201 | } | |
202 | ||
eaae8132 | 203 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d MT |
204 | { |
205 | struct vhost_ubuf_ref *ubufs = ubuf->ctx; | |
206 | struct vhost_virtqueue *vq = ubufs->vq; | |
24eb21a1 MT |
207 | int cnt = atomic_read(&ubufs->kref.refcount); |
208 | ||
209 | /* | |
210 | * Trigger polling thread if guest stopped submitting new buffers: | |
211 | * in this case, the refcount after decrement will eventually reach 1 | |
212 | * so here it is 2. | |
213 | * We also trigger polling periodically after each 16 packets | |
214 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
215 | * less than 10% of times). | |
216 | */ | |
217 | if (cnt <= 2 || !(cnt % 16)) | |
218 | vhost_poll_queue(&vq->poll); | |
b211616d | 219 | /* set len to mark this desc buffers done DMA */ |
eaae8132 MT |
220 | vq->heads[ubuf->desc].len = success ? |
221 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
b211616d MT |
222 | vhost_ubuf_put(ubufs); |
223 | } | |
224 | ||
3a4d5c94 MT |
225 | /* Expects to be always run from workqueue - which acts as |
226 | * read-size critical section for our kind of RCU. */ | |
227 | static void handle_tx(struct vhost_net *net) | |
228 | { | |
229 | struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_TX]; | |
d5675bd2 MT |
230 | unsigned out, in, s; |
231 | int head; | |
3a4d5c94 MT |
232 | struct msghdr msg = { |
233 | .msg_name = NULL, | |
234 | .msg_namelen = 0, | |
235 | .msg_control = NULL, | |
236 | .msg_controllen = 0, | |
237 | .msg_iov = vq->iov, | |
238 | .msg_flags = MSG_DONTWAIT, | |
239 | }; | |
240 | size_t len, total_len = 0; | |
241 | int err, wmem; | |
242 | size_t hdr_size; | |
28457ee6 | 243 | struct socket *sock; |
bab632d6 | 244 | struct vhost_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 245 | bool zcopy, zcopy_used; |
28457ee6 | 246 | |
5e18247b | 247 | /* TODO: check that we are running from vhost_worker? */ |
11cd1a8b | 248 | sock = rcu_dereference_check(vq->private_data, 1); |
3a4d5c94 MT |
249 | if (!sock) |
250 | return; | |
251 | ||
252 | wmem = atomic_read(&sock->sk->sk_wmem_alloc); | |
39286fa4 SS |
253 | if (wmem >= sock->sk->sk_sndbuf) { |
254 | mutex_lock(&vq->mutex); | |
255 | tx_poll_start(net, sock); | |
256 | mutex_unlock(&vq->mutex); | |
3a4d5c94 | 257 | return; |
39286fa4 | 258 | } |
3a4d5c94 | 259 | |
3a4d5c94 | 260 | mutex_lock(&vq->mutex); |
8ea8cf89 | 261 | vhost_disable_notify(&net->dev, vq); |
3a4d5c94 | 262 | |
0e255572 | 263 | if (wmem < sock->sk->sk_sndbuf / 2) |
3a4d5c94 | 264 | tx_poll_stop(net); |
8dd014ad | 265 | hdr_size = vq->vhost_hlen; |
c460f057 | 266 | zcopy = vq->ubufs; |
3a4d5c94 MT |
267 | |
268 | for (;;) { | |
bab632d6 MT |
269 | /* Release DMAs done buffers first */ |
270 | if (zcopy) | |
eaae8132 | 271 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 272 | |
3a4d5c94 MT |
273 | head = vhost_get_vq_desc(&net->dev, vq, vq->iov, |
274 | ARRAY_SIZE(vq->iov), | |
275 | &out, &in, | |
276 | NULL, NULL); | |
d5675bd2 | 277 | /* On error, stop handling until the next kick. */ |
7b3384fc | 278 | if (unlikely(head < 0)) |
d5675bd2 | 279 | break; |
3a4d5c94 MT |
280 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
281 | if (head == vq->num) { | |
9e380825 SM |
282 | int num_pends; |
283 | ||
3a4d5c94 MT |
284 | wmem = atomic_read(&sock->sk->sk_wmem_alloc); |
285 | if (wmem >= sock->sk->sk_sndbuf * 3 / 4) { | |
286 | tx_poll_start(net, sock); | |
287 | set_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
288 | break; | |
289 | } | |
9e380825 SM |
290 | /* If more outstanding DMAs, queue the work. |
291 | * Handle upend_idx wrap around | |
292 | */ | |
293 | num_pends = likely(vq->upend_idx >= vq->done_idx) ? | |
294 | (vq->upend_idx - vq->done_idx) : | |
295 | (vq->upend_idx + UIO_MAXIOV - vq->done_idx); | |
296 | if (unlikely(num_pends > VHOST_MAX_PEND)) { | |
bab632d6 MT |
297 | tx_poll_start(net, sock); |
298 | set_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
299 | break; | |
300 | } | |
8ea8cf89 MT |
301 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
302 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
303 | continue; |
304 | } | |
305 | break; | |
306 | } | |
307 | if (in) { | |
308 | vq_err(vq, "Unexpected descriptor format for TX: " | |
309 | "out %d, int %d\n", out, in); | |
310 | break; | |
311 | } | |
312 | /* Skip header. TODO: support TSO. */ | |
313 | s = move_iovec_hdr(vq->iov, vq->hdr, hdr_size, out); | |
314 | msg.msg_iovlen = out; | |
315 | len = iov_length(vq->iov, out); | |
316 | /* Sanity check */ | |
317 | if (!len) { | |
318 | vq_err(vq, "Unexpected header len for TX: " | |
319 | "%zd expected %zd\n", | |
320 | iov_length(vq->hdr, s), hdr_size); | |
321 | break; | |
322 | } | |
cedb9bdc MT |
323 | zcopy_used = zcopy && (len >= VHOST_GOODCOPY_LEN || |
324 | vq->upend_idx != vq->done_idx); | |
325 | ||
bab632d6 | 326 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 327 | if (zcopy_used) { |
bab632d6 | 328 | vq->heads[vq->upend_idx].id = head; |
eaae8132 MT |
329 | if (!vhost_net_tx_select_zcopy(net) || |
330 | len < VHOST_GOODCOPY_LEN) { | |
bab632d6 MT |
331 | /* copy don't need to wait for DMA done */ |
332 | vq->heads[vq->upend_idx].len = | |
333 | VHOST_DMA_DONE_LEN; | |
334 | msg.msg_control = NULL; | |
335 | msg.msg_controllen = 0; | |
336 | ubufs = NULL; | |
337 | } else { | |
338 | struct ubuf_info *ubuf = &vq->ubuf_info[head]; | |
339 | ||
70e4cb9a MT |
340 | vq->heads[vq->upend_idx].len = |
341 | VHOST_DMA_IN_PROGRESS; | |
bab632d6 | 342 | ubuf->callback = vhost_zerocopy_callback; |
ca8f4fb2 | 343 | ubuf->ctx = vq->ubufs; |
bab632d6 MT |
344 | ubuf->desc = vq->upend_idx; |
345 | msg.msg_control = ubuf; | |
346 | msg.msg_controllen = sizeof(ubuf); | |
347 | ubufs = vq->ubufs; | |
348 | kref_get(&ubufs->kref); | |
349 | } | |
350 | vq->upend_idx = (vq->upend_idx + 1) % UIO_MAXIOV; | |
351 | } | |
3a4d5c94 MT |
352 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
353 | err = sock->ops->sendmsg(NULL, sock, &msg, len); | |
354 | if (unlikely(err < 0)) { | |
cedb9bdc | 355 | if (zcopy_used) { |
bab632d6 MT |
356 | if (ubufs) |
357 | vhost_ubuf_put(ubufs); | |
358 | vq->upend_idx = ((unsigned)vq->upend_idx - 1) % | |
359 | UIO_MAXIOV; | |
360 | } | |
8dd014ad | 361 | vhost_discard_vq_desc(vq, 1); |
dbf34207 JW |
362 | if (err == -EAGAIN || err == -ENOBUFS) |
363 | tx_poll_start(net, sock); | |
3a4d5c94 MT |
364 | break; |
365 | } | |
366 | if (err != len) | |
95c0ec6a MT |
367 | pr_debug("Truncated TX packet: " |
368 | " len %d != %zd\n", err, len); | |
cedb9bdc | 369 | if (!zcopy_used) |
bab632d6 | 370 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 371 | else |
eaae8132 | 372 | vhost_zerocopy_signal_used(net, vq); |
3a4d5c94 | 373 | total_len += len; |
eaae8132 | 374 | vhost_net_tx_packet(net); |
3a4d5c94 MT |
375 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
376 | vhost_poll_queue(&vq->poll); | |
377 | break; | |
378 | } | |
379 | } | |
380 | ||
381 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
382 | } |
383 | ||
8dd014ad DS |
384 | static int peek_head_len(struct sock *sk) |
385 | { | |
386 | struct sk_buff *head; | |
387 | int len = 0; | |
783e3988 | 388 | unsigned long flags; |
8dd014ad | 389 | |
783e3988 | 390 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 391 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 392 | if (likely(head)) { |
8dd014ad | 393 | len = head->len; |
c53cff5e BG |
394 | if (vlan_tx_tag_present(head)) |
395 | len += VLAN_HLEN; | |
396 | } | |
397 | ||
783e3988 | 398 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
399 | return len; |
400 | } | |
401 | ||
402 | /* This is a multi-buffer version of vhost_get_desc, that works if | |
403 | * vq has read descriptors only. | |
404 | * @vq - the relevant virtqueue | |
405 | * @datalen - data length we'll be reading | |
406 | * @iovcount - returned count of io vectors we fill | |
407 | * @log - vhost log | |
408 | * @log_num - log offset | |
94249369 | 409 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
410 | * returns number of buffer heads allocated, negative on error |
411 | */ | |
412 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
413 | struct vring_used_elem *heads, | |
414 | int datalen, | |
415 | unsigned *iovcount, | |
416 | struct vhost_log *log, | |
94249369 JW |
417 | unsigned *log_num, |
418 | unsigned int quota) | |
8dd014ad DS |
419 | { |
420 | unsigned int out, in; | |
421 | int seg = 0; | |
422 | int headcount = 0; | |
423 | unsigned d; | |
424 | int r, nlogs = 0; | |
425 | ||
94249369 | 426 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 427 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
428 | r = -ENOBUFS; |
429 | goto err; | |
430 | } | |
431 | d = vhost_get_vq_desc(vq->dev, vq, vq->iov + seg, | |
432 | ARRAY_SIZE(vq->iov) - seg, &out, | |
433 | &in, log, log_num); | |
434 | if (d == vq->num) { | |
435 | r = 0; | |
436 | goto err; | |
437 | } | |
438 | if (unlikely(out || in <= 0)) { | |
439 | vq_err(vq, "unexpected descriptor format for RX: " | |
440 | "out %d, in %d\n", out, in); | |
441 | r = -EINVAL; | |
442 | goto err; | |
443 | } | |
444 | if (unlikely(log)) { | |
445 | nlogs += *log_num; | |
446 | log += *log_num; | |
447 | } | |
448 | heads[headcount].id = d; | |
449 | heads[headcount].len = iov_length(vq->iov + seg, in); | |
450 | datalen -= heads[headcount].len; | |
451 | ++headcount; | |
452 | seg += in; | |
453 | } | |
454 | heads[headcount - 1].len += datalen; | |
455 | *iovcount = seg; | |
456 | if (unlikely(log)) | |
457 | *log_num = nlogs; | |
458 | return headcount; | |
459 | err: | |
460 | vhost_discard_vq_desc(vq, headcount); | |
461 | return r; | |
462 | } | |
463 | ||
3a4d5c94 MT |
464 | /* Expects to be always run from workqueue - which acts as |
465 | * read-size critical section for our kind of RCU. */ | |
94249369 | 466 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 467 | { |
8dd014ad DS |
468 | struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_RX]; |
469 | unsigned uninitialized_var(in), log; | |
470 | struct vhost_log *vq_log; | |
471 | struct msghdr msg = { | |
472 | .msg_name = NULL, | |
473 | .msg_namelen = 0, | |
474 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
475 | .msg_controllen = 0, | |
476 | .msg_iov = vq->iov, | |
477 | .msg_flags = MSG_DONTWAIT, | |
478 | }; | |
8dd014ad DS |
479 | struct virtio_net_hdr_mrg_rxbuf hdr = { |
480 | .hdr.flags = 0, | |
481 | .hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE | |
482 | }; | |
8dd014ad | 483 | size_t total_len = 0; |
910a578f MT |
484 | int err, mergeable; |
485 | s16 headcount; | |
8dd014ad DS |
486 | size_t vhost_hlen, sock_hlen; |
487 | size_t vhost_len, sock_len; | |
5e18247b MT |
488 | /* TODO: check that we are running from vhost_worker? */ |
489 | struct socket *sock = rcu_dereference_check(vq->private_data, 1); | |
d47effe1 | 490 | |
de4d768a | 491 | if (!sock) |
8dd014ad DS |
492 | return; |
493 | ||
8dd014ad | 494 | mutex_lock(&vq->mutex); |
8ea8cf89 | 495 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
496 | vhost_hlen = vq->vhost_hlen; |
497 | sock_hlen = vq->sock_hlen; | |
498 | ||
499 | vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ? | |
500 | vq->log : NULL; | |
cfbdab95 | 501 | mergeable = vhost_has_feature(&net->dev, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad DS |
502 | |
503 | while ((sock_len = peek_head_len(sock->sk))) { | |
504 | sock_len += sock_hlen; | |
505 | vhost_len = sock_len + vhost_hlen; | |
506 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, | |
94249369 JW |
507 | &in, vq_log, &log, |
508 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
509 | /* On error, stop handling until the next kick. */ |
510 | if (unlikely(headcount < 0)) | |
511 | break; | |
512 | /* OK, now we need to know about added descriptors. */ | |
513 | if (!headcount) { | |
8ea8cf89 | 514 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
515 | /* They have slipped one in as we were |
516 | * doing that: check again. */ | |
8ea8cf89 | 517 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
518 | continue; |
519 | } | |
520 | /* Nothing new? Wait for eventfd to tell us | |
521 | * they refilled. */ | |
522 | break; | |
523 | } | |
524 | /* We don't need to be notified again. */ | |
525 | if (unlikely((vhost_hlen))) | |
526 | /* Skip header. TODO: support TSO. */ | |
527 | move_iovec_hdr(vq->iov, vq->hdr, vhost_hlen, in); | |
528 | else | |
529 | /* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF: | |
a290aec8 | 530 | * needed because recvmsg can modify msg_iov. */ |
8dd014ad DS |
531 | copy_iovec_hdr(vq->iov, vq->hdr, sock_hlen, in); |
532 | msg.msg_iovlen = in; | |
533 | err = sock->ops->recvmsg(NULL, sock, &msg, | |
534 | sock_len, MSG_DONTWAIT | MSG_TRUNC); | |
535 | /* Userspace might have consumed the packet meanwhile: | |
536 | * it's not supposed to do this usually, but might be hard | |
537 | * to prevent. Discard data we got (if any) and keep going. */ | |
538 | if (unlikely(err != sock_len)) { | |
539 | pr_debug("Discarded rx packet: " | |
540 | " len %d, expected %zd\n", err, sock_len); | |
541 | vhost_discard_vq_desc(vq, headcount); | |
542 | continue; | |
543 | } | |
544 | if (unlikely(vhost_hlen) && | |
545 | memcpy_toiovecend(vq->hdr, (unsigned char *)&hdr, 0, | |
546 | vhost_hlen)) { | |
547 | vq_err(vq, "Unable to write vnet_hdr at addr %p\n", | |
548 | vq->iov->iov_base); | |
549 | break; | |
550 | } | |
551 | /* TODO: Should check and handle checksum. */ | |
cfbdab95 | 552 | if (likely(mergeable) && |
8dd014ad DS |
553 | memcpy_toiovecend(vq->hdr, (unsigned char *)&headcount, |
554 | offsetof(typeof(hdr), num_buffers), | |
555 | sizeof hdr.num_buffers)) { | |
556 | vq_err(vq, "Failed num_buffers write"); | |
557 | vhost_discard_vq_desc(vq, headcount); | |
558 | break; | |
559 | } | |
560 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
561 | headcount); | |
562 | if (unlikely(vq_log)) | |
563 | vhost_log_write(vq, vq_log, log, vhost_len); | |
564 | total_len += vhost_len; | |
565 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
566 | vhost_poll_queue(&vq->poll); | |
567 | break; | |
568 | } | |
569 | } | |
570 | ||
571 | mutex_unlock(&vq->mutex); | |
8dd014ad DS |
572 | } |
573 | ||
c23f3445 | 574 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 575 | { |
c23f3445 TH |
576 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
577 | poll.work); | |
578 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
579 | ||
3a4d5c94 MT |
580 | handle_tx(net); |
581 | } | |
582 | ||
c23f3445 | 583 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 584 | { |
c23f3445 TH |
585 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
586 | poll.work); | |
587 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
588 | ||
3a4d5c94 MT |
589 | handle_rx(net); |
590 | } | |
591 | ||
c23f3445 | 592 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 593 | { |
c23f3445 TH |
594 | struct vhost_net *net = container_of(work, struct vhost_net, |
595 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
596 | handle_tx(net); |
597 | } | |
598 | ||
c23f3445 | 599 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 600 | { |
c23f3445 TH |
601 | struct vhost_net *net = container_of(work, struct vhost_net, |
602 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
603 | handle_rx(net); |
604 | } | |
605 | ||
606 | static int vhost_net_open(struct inode *inode, struct file *f) | |
607 | { | |
608 | struct vhost_net *n = kmalloc(sizeof *n, GFP_KERNEL); | |
c23f3445 | 609 | struct vhost_dev *dev; |
3a4d5c94 | 610 | int r; |
c23f3445 | 611 | |
3a4d5c94 MT |
612 | if (!n) |
613 | return -ENOMEM; | |
c23f3445 TH |
614 | |
615 | dev = &n->dev; | |
3a4d5c94 MT |
616 | n->vqs[VHOST_NET_VQ_TX].handle_kick = handle_tx_kick; |
617 | n->vqs[VHOST_NET_VQ_RX].handle_kick = handle_rx_kick; | |
c23f3445 | 618 | r = vhost_dev_init(dev, n->vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 MT |
619 | if (r < 0) { |
620 | kfree(n); | |
621 | return r; | |
622 | } | |
623 | ||
c23f3445 TH |
624 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
625 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); | |
3a4d5c94 MT |
626 | n->tx_poll_state = VHOST_NET_POLL_DISABLED; |
627 | ||
628 | f->private_data = n; | |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | static void vhost_net_disable_vq(struct vhost_net *n, | |
634 | struct vhost_virtqueue *vq) | |
635 | { | |
636 | if (!vq->private_data) | |
637 | return; | |
638 | if (vq == n->vqs + VHOST_NET_VQ_TX) { | |
639 | tx_poll_stop(n); | |
640 | n->tx_poll_state = VHOST_NET_POLL_DISABLED; | |
641 | } else | |
642 | vhost_poll_stop(n->poll + VHOST_NET_VQ_RX); | |
643 | } | |
644 | ||
645 | static void vhost_net_enable_vq(struct vhost_net *n, | |
646 | struct vhost_virtqueue *vq) | |
647 | { | |
28457ee6 AB |
648 | struct socket *sock; |
649 | ||
650 | sock = rcu_dereference_protected(vq->private_data, | |
651 | lockdep_is_held(&vq->mutex)); | |
3a4d5c94 MT |
652 | if (!sock) |
653 | return; | |
654 | if (vq == n->vqs + VHOST_NET_VQ_TX) { | |
655 | n->tx_poll_state = VHOST_NET_POLL_STOPPED; | |
656 | tx_poll_start(n, sock); | |
657 | } else | |
658 | vhost_poll_start(n->poll + VHOST_NET_VQ_RX, sock->file); | |
659 | } | |
660 | ||
661 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, | |
662 | struct vhost_virtqueue *vq) | |
663 | { | |
664 | struct socket *sock; | |
665 | ||
666 | mutex_lock(&vq->mutex); | |
28457ee6 AB |
667 | sock = rcu_dereference_protected(vq->private_data, |
668 | lockdep_is_held(&vq->mutex)); | |
3a4d5c94 MT |
669 | vhost_net_disable_vq(n, vq); |
670 | rcu_assign_pointer(vq->private_data, NULL); | |
671 | mutex_unlock(&vq->mutex); | |
672 | return sock; | |
673 | } | |
674 | ||
675 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
676 | struct socket **rx_sock) | |
677 | { | |
678 | *tx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_TX); | |
679 | *rx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_RX); | |
680 | } | |
681 | ||
682 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
683 | { | |
684 | vhost_poll_flush(n->poll + index); | |
685 | vhost_poll_flush(&n->dev.vqs[index].poll); | |
686 | } | |
687 | ||
688 | static void vhost_net_flush(struct vhost_net *n) | |
689 | { | |
690 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
691 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
1280c27f MT |
692 | if (n->dev.vqs[VHOST_NET_VQ_TX].ubufs) { |
693 | mutex_lock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex); | |
694 | n->tx_flush = true; | |
695 | mutex_unlock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex); | |
696 | /* Wait for all lower device DMAs done. */ | |
697 | vhost_ubuf_put_and_wait(n->dev.vqs[VHOST_NET_VQ_TX].ubufs); | |
698 | mutex_lock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex); | |
699 | n->tx_flush = false; | |
700 | kref_init(&n->dev.vqs[VHOST_NET_VQ_TX].ubufs->kref); | |
701 | mutex_unlock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex); | |
702 | } | |
3a4d5c94 MT |
703 | } |
704 | ||
705 | static int vhost_net_release(struct inode *inode, struct file *f) | |
706 | { | |
707 | struct vhost_net *n = f->private_data; | |
708 | struct socket *tx_sock; | |
709 | struct socket *rx_sock; | |
710 | ||
711 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
712 | vhost_net_flush(n); | |
b211616d | 713 | vhost_dev_stop(&n->dev); |
ea5d4046 | 714 | vhost_dev_cleanup(&n->dev, false); |
3a4d5c94 MT |
715 | if (tx_sock) |
716 | fput(tx_sock->file); | |
717 | if (rx_sock) | |
718 | fput(rx_sock->file); | |
719 | /* We do an extra flush before freeing memory, | |
720 | * since jobs can re-queue themselves. */ | |
721 | vhost_net_flush(n); | |
722 | kfree(n); | |
723 | return 0; | |
724 | } | |
725 | ||
726 | static struct socket *get_raw_socket(int fd) | |
727 | { | |
728 | struct { | |
729 | struct sockaddr_ll sa; | |
730 | char buf[MAX_ADDR_LEN]; | |
731 | } uaddr; | |
732 | int uaddr_len = sizeof uaddr, r; | |
733 | struct socket *sock = sockfd_lookup(fd, &r); | |
d47effe1 | 734 | |
3a4d5c94 MT |
735 | if (!sock) |
736 | return ERR_PTR(-ENOTSOCK); | |
737 | ||
738 | /* Parameter checking */ | |
739 | if (sock->sk->sk_type != SOCK_RAW) { | |
740 | r = -ESOCKTNOSUPPORT; | |
741 | goto err; | |
742 | } | |
743 | ||
744 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
745 | &uaddr_len, 0); | |
746 | if (r) | |
747 | goto err; | |
748 | ||
749 | if (uaddr.sa.sll_family != AF_PACKET) { | |
750 | r = -EPFNOSUPPORT; | |
751 | goto err; | |
752 | } | |
753 | return sock; | |
754 | err: | |
755 | fput(sock->file); | |
756 | return ERR_PTR(r); | |
757 | } | |
758 | ||
501c774c | 759 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
760 | { |
761 | struct file *file = fget(fd); | |
762 | struct socket *sock; | |
d47effe1 | 763 | |
3a4d5c94 MT |
764 | if (!file) |
765 | return ERR_PTR(-EBADF); | |
766 | sock = tun_get_socket(file); | |
501c774c AB |
767 | if (!IS_ERR(sock)) |
768 | return sock; | |
769 | sock = macvtap_get_socket(file); | |
3a4d5c94 MT |
770 | if (IS_ERR(sock)) |
771 | fput(file); | |
772 | return sock; | |
773 | } | |
774 | ||
775 | static struct socket *get_socket(int fd) | |
776 | { | |
777 | struct socket *sock; | |
d47effe1 | 778 | |
3a4d5c94 MT |
779 | /* special case to disable backend */ |
780 | if (fd == -1) | |
781 | return NULL; | |
782 | sock = get_raw_socket(fd); | |
783 | if (!IS_ERR(sock)) | |
784 | return sock; | |
501c774c | 785 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
786 | if (!IS_ERR(sock)) |
787 | return sock; | |
788 | return ERR_PTR(-ENOTSOCK); | |
789 | } | |
790 | ||
791 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
792 | { | |
793 | struct socket *sock, *oldsock; | |
794 | struct vhost_virtqueue *vq; | |
bab632d6 | 795 | struct vhost_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
796 | int r; |
797 | ||
798 | mutex_lock(&n->dev.mutex); | |
799 | r = vhost_dev_check_owner(&n->dev); | |
800 | if (r) | |
801 | goto err; | |
802 | ||
803 | if (index >= VHOST_NET_VQ_MAX) { | |
804 | r = -ENOBUFS; | |
805 | goto err; | |
806 | } | |
807 | vq = n->vqs + index; | |
808 | mutex_lock(&vq->mutex); | |
809 | ||
810 | /* Verify that ring has been setup correctly. */ | |
811 | if (!vhost_vq_access_ok(vq)) { | |
812 | r = -EFAULT; | |
1dace8c8 | 813 | goto err_vq; |
3a4d5c94 MT |
814 | } |
815 | sock = get_socket(fd); | |
816 | if (IS_ERR(sock)) { | |
817 | r = PTR_ERR(sock); | |
1dace8c8 | 818 | goto err_vq; |
3a4d5c94 MT |
819 | } |
820 | ||
821 | /* start polling new socket */ | |
28457ee6 AB |
822 | oldsock = rcu_dereference_protected(vq->private_data, |
823 | lockdep_is_held(&vq->mutex)); | |
11fe8839 | 824 | if (sock != oldsock) { |
bab632d6 MT |
825 | ubufs = vhost_ubuf_alloc(vq, sock && vhost_sock_zcopy(sock)); |
826 | if (IS_ERR(ubufs)) { | |
827 | r = PTR_ERR(ubufs); | |
828 | goto err_ubufs; | |
829 | } | |
692a998b | 830 | |
d47effe1 KK |
831 | vhost_net_disable_vq(n, vq); |
832 | rcu_assign_pointer(vq->private_data, sock); | |
f59281da JW |
833 | r = vhost_init_used(vq); |
834 | if (r) | |
692a998b JW |
835 | goto err_used; |
836 | vhost_net_enable_vq(n, vq); | |
837 | ||
838 | oldubufs = vq->ubufs; | |
839 | vq->ubufs = ubufs; | |
64e9a9b8 MT |
840 | |
841 | n->tx_packets = 0; | |
842 | n->tx_zcopy_err = 0; | |
1280c27f | 843 | n->tx_flush = false; |
dd1f4078 | 844 | } |
3a4d5c94 | 845 | |
1680e906 MT |
846 | mutex_unlock(&vq->mutex); |
847 | ||
c047e5f3 | 848 | if (oldubufs) { |
bab632d6 | 849 | vhost_ubuf_put_and_wait(oldubufs); |
c047e5f3 | 850 | mutex_lock(&vq->mutex); |
eaae8132 | 851 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
852 | mutex_unlock(&vq->mutex); |
853 | } | |
bab632d6 | 854 | |
3a4d5c94 MT |
855 | if (oldsock) { |
856 | vhost_net_flush_vq(n, index); | |
857 | fput(oldsock->file); | |
858 | } | |
1dace8c8 | 859 | |
1680e906 MT |
860 | mutex_unlock(&n->dev.mutex); |
861 | return 0; | |
862 | ||
692a998b JW |
863 | err_used: |
864 | rcu_assign_pointer(vq->private_data, oldsock); | |
865 | vhost_net_enable_vq(n, vq); | |
866 | if (ubufs) | |
867 | vhost_ubuf_put_and_wait(ubufs); | |
bab632d6 MT |
868 | err_ubufs: |
869 | fput(sock->file); | |
1dace8c8 JD |
870 | err_vq: |
871 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
872 | err: |
873 | mutex_unlock(&n->dev.mutex); | |
874 | return r; | |
875 | } | |
876 | ||
877 | static long vhost_net_reset_owner(struct vhost_net *n) | |
878 | { | |
879 | struct socket *tx_sock = NULL; | |
880 | struct socket *rx_sock = NULL; | |
881 | long err; | |
d47effe1 | 882 | |
3a4d5c94 MT |
883 | mutex_lock(&n->dev.mutex); |
884 | err = vhost_dev_check_owner(&n->dev); | |
885 | if (err) | |
886 | goto done; | |
887 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
888 | vhost_net_flush(n); | |
889 | err = vhost_dev_reset_owner(&n->dev); | |
890 | done: | |
891 | mutex_unlock(&n->dev.mutex); | |
892 | if (tx_sock) | |
893 | fput(tx_sock->file); | |
894 | if (rx_sock) | |
895 | fput(rx_sock->file); | |
896 | return err; | |
897 | } | |
898 | ||
899 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
900 | { | |
8dd014ad | 901 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 902 | int i; |
8dd014ad DS |
903 | |
904 | hdr_len = (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? | |
905 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : | |
906 | sizeof(struct virtio_net_hdr); | |
907 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
908 | /* vhost provides vnet_hdr */ | |
909 | vhost_hlen = hdr_len; | |
910 | sock_hlen = 0; | |
911 | } else { | |
912 | /* socket provides vnet_hdr */ | |
913 | vhost_hlen = 0; | |
914 | sock_hlen = hdr_len; | |
915 | } | |
3a4d5c94 MT |
916 | mutex_lock(&n->dev.mutex); |
917 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
918 | !vhost_log_access_ok(&n->dev)) { | |
919 | mutex_unlock(&n->dev.mutex); | |
920 | return -EFAULT; | |
921 | } | |
922 | n->dev.acked_features = features; | |
923 | smp_wmb(); | |
924 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { | |
925 | mutex_lock(&n->vqs[i].mutex); | |
8dd014ad DS |
926 | n->vqs[i].vhost_hlen = vhost_hlen; |
927 | n->vqs[i].sock_hlen = sock_hlen; | |
3a4d5c94 MT |
928 | mutex_unlock(&n->vqs[i].mutex); |
929 | } | |
930 | vhost_net_flush(n); | |
931 | mutex_unlock(&n->dev.mutex); | |
932 | return 0; | |
933 | } | |
934 | ||
935 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, | |
936 | unsigned long arg) | |
937 | { | |
938 | struct vhost_net *n = f->private_data; | |
939 | void __user *argp = (void __user *)arg; | |
940 | u64 __user *featurep = argp; | |
941 | struct vhost_vring_file backend; | |
942 | u64 features; | |
943 | int r; | |
d47effe1 | 944 | |
3a4d5c94 MT |
945 | switch (ioctl) { |
946 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
947 | if (copy_from_user(&backend, argp, sizeof backend)) |
948 | return -EFAULT; | |
3a4d5c94 MT |
949 | return vhost_net_set_backend(n, backend.index, backend.fd); |
950 | case VHOST_GET_FEATURES: | |
0dd05a3b | 951 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
952 | if (copy_to_user(featurep, &features, sizeof features)) |
953 | return -EFAULT; | |
954 | return 0; | |
3a4d5c94 | 955 | case VHOST_SET_FEATURES: |
d3553a52 TY |
956 | if (copy_from_user(&features, featurep, sizeof features)) |
957 | return -EFAULT; | |
0dd05a3b | 958 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
959 | return -EOPNOTSUPP; |
960 | return vhost_net_set_features(n, features); | |
961 | case VHOST_RESET_OWNER: | |
962 | return vhost_net_reset_owner(n); | |
963 | default: | |
964 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
965 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
966 | if (r == -ENOIOCTLCMD) | |
967 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
968 | else | |
969 | vhost_net_flush(n); | |
3a4d5c94 MT |
970 | mutex_unlock(&n->dev.mutex); |
971 | return r; | |
972 | } | |
973 | } | |
974 | ||
975 | #ifdef CONFIG_COMPAT | |
976 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
977 | unsigned long arg) | |
978 | { | |
979 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
980 | } | |
981 | #endif | |
982 | ||
373a83a6 | 983 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
984 | .owner = THIS_MODULE, |
985 | .release = vhost_net_release, | |
986 | .unlocked_ioctl = vhost_net_ioctl, | |
987 | #ifdef CONFIG_COMPAT | |
988 | .compat_ioctl = vhost_net_compat_ioctl, | |
989 | #endif | |
990 | .open = vhost_net_open, | |
6038f373 | 991 | .llseek = noop_llseek, |
3a4d5c94 MT |
992 | }; |
993 | ||
994 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 995 | .minor = VHOST_NET_MINOR, |
996 | .name = "vhost-net", | |
997 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
998 | }; |
999 | ||
a8d3782f | 1000 | static int vhost_net_init(void) |
3a4d5c94 | 1001 | { |
bab632d6 MT |
1002 | if (experimental_zcopytx) |
1003 | vhost_enable_zcopy(VHOST_NET_VQ_TX); | |
c23f3445 | 1004 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1005 | } |
1006 | module_init(vhost_net_init); | |
1007 | ||
a8d3782f | 1008 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1009 | { |
1010 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1011 | } |
1012 | module_exit(vhost_net_exit); | |
1013 | ||
1014 | MODULE_VERSION("0.0.1"); | |
1015 | MODULE_LICENSE("GPL v2"); | |
1016 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1017 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1018 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1019 | MODULE_ALIAS("devname:vhost-net"); |