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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 | ||
2839400f AH |
67 | struct vhost_ubuf_ref { |
68 | struct kref kref; | |
69 | wait_queue_head_t wait; | |
70 | struct vhost_virtqueue *vq; | |
71 | }; | |
72 | ||
3ab2e420 AH |
73 | struct vhost_net_virtqueue { |
74 | struct vhost_virtqueue vq; | |
81f95a55 MT |
75 | /* hdr is used to store the virtio header. |
76 | * Since each iovec has >= 1 byte length, we never need more than | |
77 | * header length entries to store the header. */ | |
78 | struct iovec hdr[sizeof(struct virtio_net_hdr_mrg_rxbuf)]; | |
79 | size_t vhost_hlen; | |
80 | size_t sock_hlen; | |
2839400f AH |
81 | /* vhost zerocopy support fields below: */ |
82 | /* last used idx for outstanding DMA zerocopy buffers */ | |
83 | int upend_idx; | |
84 | /* first used idx for DMA done zerocopy buffers */ | |
85 | int done_idx; | |
86 | /* an array of userspace buffers info */ | |
87 | struct ubuf_info *ubuf_info; | |
88 | /* Reference counting for outstanding ubufs. | |
89 | * Protected by vq mutex. Writers must also take device mutex. */ | |
90 | struct vhost_ubuf_ref *ubufs; | |
3ab2e420 AH |
91 | }; |
92 | ||
3a4d5c94 MT |
93 | struct vhost_net { |
94 | struct vhost_dev dev; | |
3ab2e420 | 95 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 96 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
97 | /* Number of TX recently submitted. |
98 | * Protected by tx vq lock. */ | |
99 | unsigned tx_packets; | |
100 | /* Number of times zerocopy TX recently failed. | |
101 | * Protected by tx vq lock. */ | |
102 | unsigned tx_zcopy_err; | |
1280c27f MT |
103 | /* Flush in progress. Protected by tx vq lock. */ |
104 | bool tx_flush; | |
3a4d5c94 MT |
105 | }; |
106 | ||
2839400f AH |
107 | static unsigned vhost_zcopy_mask __read_mostly; |
108 | ||
109 | void vhost_enable_zcopy(int vq) | |
110 | { | |
111 | vhost_zcopy_mask |= 0x1 << vq; | |
112 | } | |
113 | ||
114 | static void vhost_zerocopy_done_signal(struct kref *kref) | |
115 | { | |
116 | struct vhost_ubuf_ref *ubufs = container_of(kref, struct vhost_ubuf_ref, | |
117 | kref); | |
118 | wake_up(&ubufs->wait); | |
119 | } | |
120 | ||
121 | struct vhost_ubuf_ref *vhost_ubuf_alloc(struct vhost_virtqueue *vq, | |
122 | bool zcopy) | |
123 | { | |
124 | struct vhost_ubuf_ref *ubufs; | |
125 | /* No zero copy backend? Nothing to count. */ | |
126 | if (!zcopy) | |
127 | return NULL; | |
128 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
129 | if (!ubufs) | |
130 | return ERR_PTR(-ENOMEM); | |
131 | kref_init(&ubufs->kref); | |
132 | init_waitqueue_head(&ubufs->wait); | |
133 | ubufs->vq = vq; | |
134 | return ubufs; | |
135 | } | |
136 | ||
137 | void vhost_ubuf_put(struct vhost_ubuf_ref *ubufs) | |
138 | { | |
139 | kref_put(&ubufs->kref, vhost_zerocopy_done_signal); | |
140 | } | |
141 | ||
142 | void vhost_ubuf_put_and_wait(struct vhost_ubuf_ref *ubufs) | |
143 | { | |
144 | kref_put(&ubufs->kref, vhost_zerocopy_done_signal); | |
145 | wait_event(ubufs->wait, !atomic_read(&ubufs->kref.refcount)); | |
146 | kfree(ubufs); | |
147 | } | |
148 | ||
149 | int vhost_net_set_ubuf_info(struct vhost_net *n) | |
150 | { | |
151 | bool zcopy; | |
152 | int i; | |
153 | ||
154 | for (i = 0; i < n->dev.nvqs; ++i) { | |
155 | zcopy = vhost_zcopy_mask & (0x1 << i); | |
156 | if (!zcopy) | |
157 | continue; | |
158 | n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * | |
159 | UIO_MAXIOV, GFP_KERNEL); | |
160 | if (!n->vqs[i].ubuf_info) | |
161 | goto err; | |
162 | } | |
163 | return 0; | |
164 | ||
165 | err: | |
166 | while (i--) { | |
167 | zcopy = vhost_zcopy_mask & (0x1 << i); | |
168 | if (!zcopy) | |
169 | continue; | |
170 | kfree(n->vqs[i].ubuf_info); | |
171 | } | |
172 | return -ENOMEM; | |
173 | } | |
174 | ||
81f95a55 | 175 | void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
176 | { |
177 | int i; | |
178 | ||
179 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { | |
180 | n->vqs[i].done_idx = 0; | |
181 | n->vqs[i].upend_idx = 0; | |
182 | n->vqs[i].ubufs = NULL; | |
183 | kfree(n->vqs[i].ubuf_info); | |
184 | n->vqs[i].ubuf_info = NULL; | |
81f95a55 MT |
185 | n->vqs[i].vhost_hlen = 0; |
186 | n->vqs[i].sock_hlen = 0; | |
2839400f AH |
187 | } |
188 | ||
189 | } | |
190 | ||
eaae8132 MT |
191 | static void vhost_net_tx_packet(struct vhost_net *net) |
192 | { | |
193 | ++net->tx_packets; | |
194 | if (net->tx_packets < 1024) | |
195 | return; | |
196 | net->tx_packets = 0; | |
197 | net->tx_zcopy_err = 0; | |
198 | } | |
199 | ||
200 | static void vhost_net_tx_err(struct vhost_net *net) | |
201 | { | |
202 | ++net->tx_zcopy_err; | |
203 | } | |
204 | ||
205 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
206 | { | |
1280c27f MT |
207 | /* TX flush waits for outstanding DMAs to be done. |
208 | * Don't start new DMAs. | |
209 | */ | |
210 | return !net->tx_flush && | |
211 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
212 | } |
213 | ||
bab632d6 MT |
214 | static bool vhost_sock_zcopy(struct socket *sock) |
215 | { | |
216 | return unlikely(experimental_zcopytx) && | |
217 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
218 | } | |
219 | ||
3a4d5c94 MT |
220 | /* Pop first len bytes from iovec. Return number of segments used. */ |
221 | static int move_iovec_hdr(struct iovec *from, struct iovec *to, | |
222 | size_t len, int iov_count) | |
223 | { | |
224 | int seg = 0; | |
225 | size_t size; | |
d47effe1 | 226 | |
3a4d5c94 MT |
227 | while (len && seg < iov_count) { |
228 | size = min(from->iov_len, len); | |
229 | to->iov_base = from->iov_base; | |
230 | to->iov_len = size; | |
231 | from->iov_len -= size; | |
232 | from->iov_base += size; | |
233 | len -= size; | |
234 | ++from; | |
235 | ++to; | |
236 | ++seg; | |
237 | } | |
238 | return seg; | |
239 | } | |
8dd014ad DS |
240 | /* Copy iovec entries for len bytes from iovec. */ |
241 | static void copy_iovec_hdr(const struct iovec *from, struct iovec *to, | |
242 | size_t len, int iovcount) | |
243 | { | |
244 | int seg = 0; | |
245 | size_t size; | |
d47effe1 | 246 | |
8dd014ad DS |
247 | while (len && seg < iovcount) { |
248 | size = min(from->iov_len, len); | |
249 | to->iov_base = from->iov_base; | |
250 | to->iov_len = size; | |
251 | len -= size; | |
252 | ++from; | |
253 | ++to; | |
254 | ++seg; | |
255 | } | |
256 | } | |
3a4d5c94 | 257 | |
b211616d MT |
258 | /* In case of DMA done not in order in lower device driver for some reason. |
259 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
260 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
261 | * guest used idx. | |
262 | */ | |
eaae8132 MT |
263 | static int vhost_zerocopy_signal_used(struct vhost_net *net, |
264 | struct vhost_virtqueue *vq) | |
b211616d | 265 | { |
2839400f AH |
266 | struct vhost_net_virtqueue *nvq = |
267 | container_of(vq, struct vhost_net_virtqueue, vq); | |
b211616d MT |
268 | int i; |
269 | int j = 0; | |
270 | ||
2839400f | 271 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
272 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
273 | vhost_net_tx_err(net); | |
b211616d MT |
274 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
275 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
276 | vhost_add_used_and_signal(vq->dev, vq, | |
277 | vq->heads[i].id, 0); | |
278 | ++j; | |
279 | } else | |
280 | break; | |
281 | } | |
282 | if (j) | |
2839400f | 283 | nvq->done_idx = i; |
b211616d MT |
284 | return j; |
285 | } | |
286 | ||
eaae8132 | 287 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d MT |
288 | { |
289 | struct vhost_ubuf_ref *ubufs = ubuf->ctx; | |
290 | struct vhost_virtqueue *vq = ubufs->vq; | |
24eb21a1 MT |
291 | int cnt = atomic_read(&ubufs->kref.refcount); |
292 | ||
293 | /* | |
294 | * Trigger polling thread if guest stopped submitting new buffers: | |
295 | * in this case, the refcount after decrement will eventually reach 1 | |
296 | * so here it is 2. | |
297 | * We also trigger polling periodically after each 16 packets | |
298 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
299 | * less than 10% of times). | |
300 | */ | |
301 | if (cnt <= 2 || !(cnt % 16)) | |
302 | vhost_poll_queue(&vq->poll); | |
b211616d | 303 | /* set len to mark this desc buffers done DMA */ |
eaae8132 MT |
304 | vq->heads[ubuf->desc].len = success ? |
305 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
b211616d MT |
306 | vhost_ubuf_put(ubufs); |
307 | } | |
308 | ||
3a4d5c94 MT |
309 | /* Expects to be always run from workqueue - which acts as |
310 | * read-size critical section for our kind of RCU. */ | |
311 | static void handle_tx(struct vhost_net *net) | |
312 | { | |
2839400f | 313 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 314 | struct vhost_virtqueue *vq = &nvq->vq; |
d5675bd2 MT |
315 | unsigned out, in, s; |
316 | int head; | |
3a4d5c94 MT |
317 | struct msghdr msg = { |
318 | .msg_name = NULL, | |
319 | .msg_namelen = 0, | |
320 | .msg_control = NULL, | |
321 | .msg_controllen = 0, | |
322 | .msg_iov = vq->iov, | |
323 | .msg_flags = MSG_DONTWAIT, | |
324 | }; | |
325 | size_t len, total_len = 0; | |
70181d51 | 326 | int err; |
3a4d5c94 | 327 | size_t hdr_size; |
28457ee6 | 328 | struct socket *sock; |
bab632d6 | 329 | struct vhost_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 330 | bool zcopy, zcopy_used; |
28457ee6 | 331 | |
5e18247b | 332 | /* TODO: check that we are running from vhost_worker? */ |
11cd1a8b | 333 | sock = rcu_dereference_check(vq->private_data, 1); |
3a4d5c94 MT |
334 | if (!sock) |
335 | return; | |
336 | ||
3a4d5c94 | 337 | mutex_lock(&vq->mutex); |
8ea8cf89 | 338 | vhost_disable_notify(&net->dev, vq); |
3a4d5c94 | 339 | |
81f95a55 | 340 | hdr_size = nvq->vhost_hlen; |
2839400f | 341 | zcopy = nvq->ubufs; |
3a4d5c94 MT |
342 | |
343 | for (;;) { | |
bab632d6 MT |
344 | /* Release DMAs done buffers first */ |
345 | if (zcopy) | |
eaae8132 | 346 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 347 | |
3a4d5c94 MT |
348 | head = vhost_get_vq_desc(&net->dev, vq, vq->iov, |
349 | ARRAY_SIZE(vq->iov), | |
350 | &out, &in, | |
351 | NULL, NULL); | |
d5675bd2 | 352 | /* On error, stop handling until the next kick. */ |
7b3384fc | 353 | if (unlikely(head < 0)) |
d5675bd2 | 354 | break; |
3a4d5c94 MT |
355 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
356 | if (head == vq->num) { | |
9e380825 SM |
357 | int num_pends; |
358 | ||
9e380825 SM |
359 | /* If more outstanding DMAs, queue the work. |
360 | * Handle upend_idx wrap around | |
361 | */ | |
2839400f AH |
362 | num_pends = likely(nvq->upend_idx >= nvq->done_idx) ? |
363 | (nvq->upend_idx - nvq->done_idx) : | |
364 | (nvq->upend_idx + UIO_MAXIOV - | |
365 | nvq->done_idx); | |
70181d51 | 366 | if (unlikely(num_pends > VHOST_MAX_PEND)) |
bab632d6 | 367 | break; |
8ea8cf89 MT |
368 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
369 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
370 | continue; |
371 | } | |
372 | break; | |
373 | } | |
374 | if (in) { | |
375 | vq_err(vq, "Unexpected descriptor format for TX: " | |
376 | "out %d, int %d\n", out, in); | |
377 | break; | |
378 | } | |
379 | /* Skip header. TODO: support TSO. */ | |
81f95a55 | 380 | s = move_iovec_hdr(vq->iov, nvq->hdr, hdr_size, out); |
3a4d5c94 MT |
381 | msg.msg_iovlen = out; |
382 | len = iov_length(vq->iov, out); | |
383 | /* Sanity check */ | |
384 | if (!len) { | |
385 | vq_err(vq, "Unexpected header len for TX: " | |
386 | "%zd expected %zd\n", | |
81f95a55 | 387 | iov_length(nvq->hdr, s), hdr_size); |
3a4d5c94 MT |
388 | break; |
389 | } | |
cedb9bdc | 390 | zcopy_used = zcopy && (len >= VHOST_GOODCOPY_LEN || |
2839400f | 391 | nvq->upend_idx != nvq->done_idx); |
cedb9bdc | 392 | |
bab632d6 | 393 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 394 | if (zcopy_used) { |
2839400f | 395 | vq->heads[nvq->upend_idx].id = head; |
eaae8132 MT |
396 | if (!vhost_net_tx_select_zcopy(net) || |
397 | len < VHOST_GOODCOPY_LEN) { | |
bab632d6 | 398 | /* copy don't need to wait for DMA done */ |
2839400f | 399 | vq->heads[nvq->upend_idx].len = |
bab632d6 MT |
400 | VHOST_DMA_DONE_LEN; |
401 | msg.msg_control = NULL; | |
402 | msg.msg_controllen = 0; | |
403 | ubufs = NULL; | |
404 | } else { | |
46aa92d1 | 405 | struct ubuf_info *ubuf; |
2839400f | 406 | ubuf = nvq->ubuf_info + nvq->upend_idx; |
bab632d6 | 407 | |
2839400f | 408 | vq->heads[nvq->upend_idx].len = |
70e4cb9a | 409 | VHOST_DMA_IN_PROGRESS; |
bab632d6 | 410 | ubuf->callback = vhost_zerocopy_callback; |
2839400f AH |
411 | ubuf->ctx = nvq->ubufs; |
412 | ubuf->desc = nvq->upend_idx; | |
bab632d6 MT |
413 | msg.msg_control = ubuf; |
414 | msg.msg_controllen = sizeof(ubuf); | |
2839400f | 415 | ubufs = nvq->ubufs; |
bab632d6 MT |
416 | kref_get(&ubufs->kref); |
417 | } | |
2839400f | 418 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
bab632d6 | 419 | } |
3a4d5c94 MT |
420 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
421 | err = sock->ops->sendmsg(NULL, sock, &msg, len); | |
422 | if (unlikely(err < 0)) { | |
cedb9bdc | 423 | if (zcopy_used) { |
bab632d6 MT |
424 | if (ubufs) |
425 | vhost_ubuf_put(ubufs); | |
2839400f AH |
426 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
427 | % UIO_MAXIOV; | |
bab632d6 | 428 | } |
8dd014ad | 429 | vhost_discard_vq_desc(vq, 1); |
3a4d5c94 MT |
430 | break; |
431 | } | |
432 | if (err != len) | |
95c0ec6a MT |
433 | pr_debug("Truncated TX packet: " |
434 | " len %d != %zd\n", err, len); | |
cedb9bdc | 435 | if (!zcopy_used) |
bab632d6 | 436 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 437 | else |
eaae8132 | 438 | vhost_zerocopy_signal_used(net, vq); |
3a4d5c94 | 439 | total_len += len; |
eaae8132 | 440 | vhost_net_tx_packet(net); |
3a4d5c94 MT |
441 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
442 | vhost_poll_queue(&vq->poll); | |
443 | break; | |
444 | } | |
445 | } | |
446 | ||
447 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
448 | } |
449 | ||
8dd014ad DS |
450 | static int peek_head_len(struct sock *sk) |
451 | { | |
452 | struct sk_buff *head; | |
453 | int len = 0; | |
783e3988 | 454 | unsigned long flags; |
8dd014ad | 455 | |
783e3988 | 456 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 457 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 458 | if (likely(head)) { |
8dd014ad | 459 | len = head->len; |
c53cff5e BG |
460 | if (vlan_tx_tag_present(head)) |
461 | len += VLAN_HLEN; | |
462 | } | |
463 | ||
783e3988 | 464 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
465 | return len; |
466 | } | |
467 | ||
468 | /* This is a multi-buffer version of vhost_get_desc, that works if | |
469 | * vq has read descriptors only. | |
470 | * @vq - the relevant virtqueue | |
471 | * @datalen - data length we'll be reading | |
472 | * @iovcount - returned count of io vectors we fill | |
473 | * @log - vhost log | |
474 | * @log_num - log offset | |
94249369 | 475 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
476 | * returns number of buffer heads allocated, negative on error |
477 | */ | |
478 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
479 | struct vring_used_elem *heads, | |
480 | int datalen, | |
481 | unsigned *iovcount, | |
482 | struct vhost_log *log, | |
94249369 JW |
483 | unsigned *log_num, |
484 | unsigned int quota) | |
8dd014ad DS |
485 | { |
486 | unsigned int out, in; | |
487 | int seg = 0; | |
488 | int headcount = 0; | |
489 | unsigned d; | |
490 | int r, nlogs = 0; | |
491 | ||
94249369 | 492 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 493 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
494 | r = -ENOBUFS; |
495 | goto err; | |
496 | } | |
497 | d = vhost_get_vq_desc(vq->dev, vq, vq->iov + seg, | |
498 | ARRAY_SIZE(vq->iov) - seg, &out, | |
499 | &in, log, log_num); | |
500 | if (d == vq->num) { | |
501 | r = 0; | |
502 | goto err; | |
503 | } | |
504 | if (unlikely(out || in <= 0)) { | |
505 | vq_err(vq, "unexpected descriptor format for RX: " | |
506 | "out %d, in %d\n", out, in); | |
507 | r = -EINVAL; | |
508 | goto err; | |
509 | } | |
510 | if (unlikely(log)) { | |
511 | nlogs += *log_num; | |
512 | log += *log_num; | |
513 | } | |
514 | heads[headcount].id = d; | |
515 | heads[headcount].len = iov_length(vq->iov + seg, in); | |
516 | datalen -= heads[headcount].len; | |
517 | ++headcount; | |
518 | seg += in; | |
519 | } | |
520 | heads[headcount - 1].len += datalen; | |
521 | *iovcount = seg; | |
522 | if (unlikely(log)) | |
523 | *log_num = nlogs; | |
524 | return headcount; | |
525 | err: | |
526 | vhost_discard_vq_desc(vq, headcount); | |
527 | return r; | |
528 | } | |
529 | ||
3a4d5c94 MT |
530 | /* Expects to be always run from workqueue - which acts as |
531 | * read-size critical section for our kind of RCU. */ | |
94249369 | 532 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 533 | { |
81f95a55 MT |
534 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
535 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
536 | unsigned uninitialized_var(in), log; |
537 | struct vhost_log *vq_log; | |
538 | struct msghdr msg = { | |
539 | .msg_name = NULL, | |
540 | .msg_namelen = 0, | |
541 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
542 | .msg_controllen = 0, | |
543 | .msg_iov = vq->iov, | |
544 | .msg_flags = MSG_DONTWAIT, | |
545 | }; | |
8dd014ad DS |
546 | struct virtio_net_hdr_mrg_rxbuf hdr = { |
547 | .hdr.flags = 0, | |
548 | .hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE | |
549 | }; | |
8dd014ad | 550 | size_t total_len = 0; |
910a578f MT |
551 | int err, mergeable; |
552 | s16 headcount; | |
8dd014ad DS |
553 | size_t vhost_hlen, sock_hlen; |
554 | size_t vhost_len, sock_len; | |
5e18247b MT |
555 | /* TODO: check that we are running from vhost_worker? */ |
556 | struct socket *sock = rcu_dereference_check(vq->private_data, 1); | |
d47effe1 | 557 | |
de4d768a | 558 | if (!sock) |
8dd014ad DS |
559 | return; |
560 | ||
8dd014ad | 561 | mutex_lock(&vq->mutex); |
8ea8cf89 | 562 | vhost_disable_notify(&net->dev, vq); |
81f95a55 MT |
563 | vhost_hlen = nvq->vhost_hlen; |
564 | sock_hlen = nvq->sock_hlen; | |
8dd014ad DS |
565 | |
566 | vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ? | |
567 | vq->log : NULL; | |
cfbdab95 | 568 | mergeable = vhost_has_feature(&net->dev, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad DS |
569 | |
570 | while ((sock_len = peek_head_len(sock->sk))) { | |
571 | sock_len += sock_hlen; | |
572 | vhost_len = sock_len + vhost_hlen; | |
573 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, | |
94249369 JW |
574 | &in, vq_log, &log, |
575 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
576 | /* On error, stop handling until the next kick. */ |
577 | if (unlikely(headcount < 0)) | |
578 | break; | |
579 | /* OK, now we need to know about added descriptors. */ | |
580 | if (!headcount) { | |
8ea8cf89 | 581 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
582 | /* They have slipped one in as we were |
583 | * doing that: check again. */ | |
8ea8cf89 | 584 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
585 | continue; |
586 | } | |
587 | /* Nothing new? Wait for eventfd to tell us | |
588 | * they refilled. */ | |
589 | break; | |
590 | } | |
591 | /* We don't need to be notified again. */ | |
592 | if (unlikely((vhost_hlen))) | |
593 | /* Skip header. TODO: support TSO. */ | |
81f95a55 | 594 | move_iovec_hdr(vq->iov, nvq->hdr, vhost_hlen, in); |
8dd014ad DS |
595 | else |
596 | /* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF: | |
a290aec8 | 597 | * needed because recvmsg can modify msg_iov. */ |
81f95a55 | 598 | copy_iovec_hdr(vq->iov, nvq->hdr, sock_hlen, in); |
8dd014ad DS |
599 | msg.msg_iovlen = in; |
600 | err = sock->ops->recvmsg(NULL, sock, &msg, | |
601 | sock_len, MSG_DONTWAIT | MSG_TRUNC); | |
602 | /* Userspace might have consumed the packet meanwhile: | |
603 | * it's not supposed to do this usually, but might be hard | |
604 | * to prevent. Discard data we got (if any) and keep going. */ | |
605 | if (unlikely(err != sock_len)) { | |
606 | pr_debug("Discarded rx packet: " | |
607 | " len %d, expected %zd\n", err, sock_len); | |
608 | vhost_discard_vq_desc(vq, headcount); | |
609 | continue; | |
610 | } | |
611 | if (unlikely(vhost_hlen) && | |
81f95a55 | 612 | memcpy_toiovecend(nvq->hdr, (unsigned char *)&hdr, 0, |
8dd014ad DS |
613 | vhost_hlen)) { |
614 | vq_err(vq, "Unable to write vnet_hdr at addr %p\n", | |
615 | vq->iov->iov_base); | |
616 | break; | |
617 | } | |
618 | /* TODO: Should check and handle checksum. */ | |
cfbdab95 | 619 | if (likely(mergeable) && |
81f95a55 | 620 | memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount, |
8dd014ad DS |
621 | offsetof(typeof(hdr), num_buffers), |
622 | sizeof hdr.num_buffers)) { | |
623 | vq_err(vq, "Failed num_buffers write"); | |
624 | vhost_discard_vq_desc(vq, headcount); | |
625 | break; | |
626 | } | |
627 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
628 | headcount); | |
629 | if (unlikely(vq_log)) | |
630 | vhost_log_write(vq, vq_log, log, vhost_len); | |
631 | total_len += vhost_len; | |
632 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
633 | vhost_poll_queue(&vq->poll); | |
634 | break; | |
635 | } | |
636 | } | |
637 | ||
638 | mutex_unlock(&vq->mutex); | |
8dd014ad DS |
639 | } |
640 | ||
c23f3445 | 641 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 642 | { |
c23f3445 TH |
643 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
644 | poll.work); | |
645 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
646 | ||
3a4d5c94 MT |
647 | handle_tx(net); |
648 | } | |
649 | ||
c23f3445 | 650 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 651 | { |
c23f3445 TH |
652 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
653 | poll.work); | |
654 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
655 | ||
3a4d5c94 MT |
656 | handle_rx(net); |
657 | } | |
658 | ||
c23f3445 | 659 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 660 | { |
c23f3445 TH |
661 | struct vhost_net *net = container_of(work, struct vhost_net, |
662 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
663 | handle_tx(net); |
664 | } | |
665 | ||
c23f3445 | 666 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 667 | { |
c23f3445 TH |
668 | struct vhost_net *net = container_of(work, struct vhost_net, |
669 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
670 | handle_rx(net); |
671 | } | |
672 | ||
673 | static int vhost_net_open(struct inode *inode, struct file *f) | |
674 | { | |
675 | struct vhost_net *n = kmalloc(sizeof *n, GFP_KERNEL); | |
c23f3445 | 676 | struct vhost_dev *dev; |
3ab2e420 | 677 | struct vhost_virtqueue **vqs; |
2839400f | 678 | int r, i; |
c23f3445 | 679 | |
3a4d5c94 MT |
680 | if (!n) |
681 | return -ENOMEM; | |
3ab2e420 AH |
682 | vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
683 | if (!vqs) { | |
684 | kfree(n); | |
685 | return -ENOMEM; | |
686 | } | |
c23f3445 TH |
687 | |
688 | dev = &n->dev; | |
3ab2e420 AH |
689 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
690 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
691 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
692 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
693 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
694 | n->vqs[i].ubufs = NULL; | |
695 | n->vqs[i].ubuf_info = NULL; | |
696 | n->vqs[i].upend_idx = 0; | |
697 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
698 | n->vqs[i].vhost_hlen = 0; |
699 | n->vqs[i].sock_hlen = 0; | |
2839400f | 700 | } |
3ab2e420 | 701 | r = vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 MT |
702 | if (r < 0) { |
703 | kfree(n); | |
3ab2e420 | 704 | kfree(vqs); |
3a4d5c94 MT |
705 | return r; |
706 | } | |
707 | ||
c23f3445 TH |
708 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
709 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); | |
3a4d5c94 MT |
710 | |
711 | f->private_data = n; | |
712 | ||
713 | return 0; | |
714 | } | |
715 | ||
716 | static void vhost_net_disable_vq(struct vhost_net *n, | |
717 | struct vhost_virtqueue *vq) | |
718 | { | |
3ab2e420 AH |
719 | struct vhost_net_virtqueue *nvq = |
720 | container_of(vq, struct vhost_net_virtqueue, vq); | |
721 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
3a4d5c94 MT |
722 | if (!vq->private_data) |
723 | return; | |
70181d51 | 724 | vhost_poll_stop(poll); |
3a4d5c94 MT |
725 | } |
726 | ||
2b8b328b | 727 | static int vhost_net_enable_vq(struct vhost_net *n, |
3a4d5c94 MT |
728 | struct vhost_virtqueue *vq) |
729 | { | |
3ab2e420 AH |
730 | struct vhost_net_virtqueue *nvq = |
731 | container_of(vq, struct vhost_net_virtqueue, vq); | |
732 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
28457ee6 AB |
733 | struct socket *sock; |
734 | ||
735 | sock = rcu_dereference_protected(vq->private_data, | |
736 | lockdep_is_held(&vq->mutex)); | |
3a4d5c94 | 737 | if (!sock) |
2b8b328b | 738 | return 0; |
2b8b328b | 739 | |
70181d51 | 740 | return vhost_poll_start(poll, sock->file); |
3a4d5c94 MT |
741 | } |
742 | ||
743 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, | |
744 | struct vhost_virtqueue *vq) | |
745 | { | |
746 | struct socket *sock; | |
747 | ||
748 | mutex_lock(&vq->mutex); | |
28457ee6 AB |
749 | sock = rcu_dereference_protected(vq->private_data, |
750 | lockdep_is_held(&vq->mutex)); | |
3a4d5c94 MT |
751 | vhost_net_disable_vq(n, vq); |
752 | rcu_assign_pointer(vq->private_data, NULL); | |
753 | mutex_unlock(&vq->mutex); | |
754 | return sock; | |
755 | } | |
756 | ||
757 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
758 | struct socket **rx_sock) | |
759 | { | |
3ab2e420 AH |
760 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
761 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
762 | } |
763 | ||
764 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
765 | { | |
766 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 767 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
768 | } |
769 | ||
770 | static void vhost_net_flush(struct vhost_net *n) | |
771 | { | |
772 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
773 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 774 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 775 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 776 | n->tx_flush = true; |
3ab2e420 | 777 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 778 | /* Wait for all lower device DMAs done. */ |
2839400f | 779 | vhost_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 780 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 781 | n->tx_flush = false; |
2839400f | 782 | kref_init(&n->vqs[VHOST_NET_VQ_TX].ubufs->kref); |
3ab2e420 | 783 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 784 | } |
3a4d5c94 MT |
785 | } |
786 | ||
787 | static int vhost_net_release(struct inode *inode, struct file *f) | |
788 | { | |
789 | struct vhost_net *n = f->private_data; | |
790 | struct socket *tx_sock; | |
791 | struct socket *rx_sock; | |
792 | ||
793 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
794 | vhost_net_flush(n); | |
b211616d | 795 | vhost_dev_stop(&n->dev); |
ea5d4046 | 796 | vhost_dev_cleanup(&n->dev, false); |
81f95a55 | 797 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
798 | if (tx_sock) |
799 | fput(tx_sock->file); | |
800 | if (rx_sock) | |
801 | fput(rx_sock->file); | |
802 | /* We do an extra flush before freeing memory, | |
803 | * since jobs can re-queue themselves. */ | |
804 | vhost_net_flush(n); | |
3ab2e420 | 805 | kfree(n->dev.vqs); |
3a4d5c94 MT |
806 | kfree(n); |
807 | return 0; | |
808 | } | |
809 | ||
810 | static struct socket *get_raw_socket(int fd) | |
811 | { | |
812 | struct { | |
813 | struct sockaddr_ll sa; | |
814 | char buf[MAX_ADDR_LEN]; | |
815 | } uaddr; | |
816 | int uaddr_len = sizeof uaddr, r; | |
817 | struct socket *sock = sockfd_lookup(fd, &r); | |
d47effe1 | 818 | |
3a4d5c94 MT |
819 | if (!sock) |
820 | return ERR_PTR(-ENOTSOCK); | |
821 | ||
822 | /* Parameter checking */ | |
823 | if (sock->sk->sk_type != SOCK_RAW) { | |
824 | r = -ESOCKTNOSUPPORT; | |
825 | goto err; | |
826 | } | |
827 | ||
828 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
829 | &uaddr_len, 0); | |
830 | if (r) | |
831 | goto err; | |
832 | ||
833 | if (uaddr.sa.sll_family != AF_PACKET) { | |
834 | r = -EPFNOSUPPORT; | |
835 | goto err; | |
836 | } | |
837 | return sock; | |
838 | err: | |
839 | fput(sock->file); | |
840 | return ERR_PTR(r); | |
841 | } | |
842 | ||
501c774c | 843 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
844 | { |
845 | struct file *file = fget(fd); | |
846 | struct socket *sock; | |
d47effe1 | 847 | |
3a4d5c94 MT |
848 | if (!file) |
849 | return ERR_PTR(-EBADF); | |
850 | sock = tun_get_socket(file); | |
501c774c AB |
851 | if (!IS_ERR(sock)) |
852 | return sock; | |
853 | sock = macvtap_get_socket(file); | |
3a4d5c94 MT |
854 | if (IS_ERR(sock)) |
855 | fput(file); | |
856 | return sock; | |
857 | } | |
858 | ||
859 | static struct socket *get_socket(int fd) | |
860 | { | |
861 | struct socket *sock; | |
d47effe1 | 862 | |
3a4d5c94 MT |
863 | /* special case to disable backend */ |
864 | if (fd == -1) | |
865 | return NULL; | |
866 | sock = get_raw_socket(fd); | |
867 | if (!IS_ERR(sock)) | |
868 | return sock; | |
501c774c | 869 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
870 | if (!IS_ERR(sock)) |
871 | return sock; | |
872 | return ERR_PTR(-ENOTSOCK); | |
873 | } | |
874 | ||
875 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
876 | { | |
877 | struct socket *sock, *oldsock; | |
878 | struct vhost_virtqueue *vq; | |
2839400f | 879 | struct vhost_net_virtqueue *nvq; |
bab632d6 | 880 | struct vhost_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
881 | int r; |
882 | ||
883 | mutex_lock(&n->dev.mutex); | |
884 | r = vhost_dev_check_owner(&n->dev); | |
885 | if (r) | |
886 | goto err; | |
887 | ||
888 | if (index >= VHOST_NET_VQ_MAX) { | |
889 | r = -ENOBUFS; | |
890 | goto err; | |
891 | } | |
3ab2e420 | 892 | vq = &n->vqs[index].vq; |
2839400f | 893 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
894 | mutex_lock(&vq->mutex); |
895 | ||
896 | /* Verify that ring has been setup correctly. */ | |
897 | if (!vhost_vq_access_ok(vq)) { | |
898 | r = -EFAULT; | |
1dace8c8 | 899 | goto err_vq; |
3a4d5c94 MT |
900 | } |
901 | sock = get_socket(fd); | |
902 | if (IS_ERR(sock)) { | |
903 | r = PTR_ERR(sock); | |
1dace8c8 | 904 | goto err_vq; |
3a4d5c94 MT |
905 | } |
906 | ||
907 | /* start polling new socket */ | |
28457ee6 AB |
908 | oldsock = rcu_dereference_protected(vq->private_data, |
909 | lockdep_is_held(&vq->mutex)); | |
11fe8839 | 910 | if (sock != oldsock) { |
bab632d6 MT |
911 | ubufs = vhost_ubuf_alloc(vq, sock && vhost_sock_zcopy(sock)); |
912 | if (IS_ERR(ubufs)) { | |
913 | r = PTR_ERR(ubufs); | |
914 | goto err_ubufs; | |
915 | } | |
692a998b | 916 | |
d47effe1 KK |
917 | vhost_net_disable_vq(n, vq); |
918 | rcu_assign_pointer(vq->private_data, sock); | |
f59281da JW |
919 | r = vhost_init_used(vq); |
920 | if (r) | |
692a998b | 921 | goto err_used; |
2b8b328b JW |
922 | r = vhost_net_enable_vq(n, vq); |
923 | if (r) | |
924 | goto err_used; | |
692a998b | 925 | |
2839400f AH |
926 | oldubufs = nvq->ubufs; |
927 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
928 | |
929 | n->tx_packets = 0; | |
930 | n->tx_zcopy_err = 0; | |
1280c27f | 931 | n->tx_flush = false; |
dd1f4078 | 932 | } |
3a4d5c94 | 933 | |
1680e906 MT |
934 | mutex_unlock(&vq->mutex); |
935 | ||
c047e5f3 | 936 | if (oldubufs) { |
bab632d6 | 937 | vhost_ubuf_put_and_wait(oldubufs); |
c047e5f3 | 938 | mutex_lock(&vq->mutex); |
eaae8132 | 939 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
940 | mutex_unlock(&vq->mutex); |
941 | } | |
bab632d6 | 942 | |
3a4d5c94 MT |
943 | if (oldsock) { |
944 | vhost_net_flush_vq(n, index); | |
945 | fput(oldsock->file); | |
946 | } | |
1dace8c8 | 947 | |
1680e906 MT |
948 | mutex_unlock(&n->dev.mutex); |
949 | return 0; | |
950 | ||
692a998b JW |
951 | err_used: |
952 | rcu_assign_pointer(vq->private_data, oldsock); | |
953 | vhost_net_enable_vq(n, vq); | |
954 | if (ubufs) | |
955 | vhost_ubuf_put_and_wait(ubufs); | |
bab632d6 MT |
956 | err_ubufs: |
957 | fput(sock->file); | |
1dace8c8 JD |
958 | err_vq: |
959 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
960 | err: |
961 | mutex_unlock(&n->dev.mutex); | |
962 | return r; | |
963 | } | |
964 | ||
965 | static long vhost_net_reset_owner(struct vhost_net *n) | |
966 | { | |
967 | struct socket *tx_sock = NULL; | |
968 | struct socket *rx_sock = NULL; | |
969 | long err; | |
150b9e51 | 970 | struct vhost_memory *memory; |
d47effe1 | 971 | |
3a4d5c94 MT |
972 | mutex_lock(&n->dev.mutex); |
973 | err = vhost_dev_check_owner(&n->dev); | |
974 | if (err) | |
975 | goto done; | |
150b9e51 MT |
976 | memory = vhost_dev_reset_owner_prepare(); |
977 | if (!memory) { | |
978 | err = -ENOMEM; | |
979 | goto done; | |
980 | } | |
3a4d5c94 MT |
981 | vhost_net_stop(n, &tx_sock, &rx_sock); |
982 | vhost_net_flush(n); | |
150b9e51 | 983 | vhost_dev_reset_owner(&n->dev, memory); |
81f95a55 | 984 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
985 | done: |
986 | mutex_unlock(&n->dev.mutex); | |
987 | if (tx_sock) | |
988 | fput(tx_sock->file); | |
989 | if (rx_sock) | |
990 | fput(rx_sock->file); | |
991 | return err; | |
992 | } | |
993 | ||
994 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
995 | { | |
8dd014ad | 996 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 997 | int i; |
8dd014ad DS |
998 | |
999 | hdr_len = (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? | |
1000 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : | |
1001 | sizeof(struct virtio_net_hdr); | |
1002 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1003 | /* vhost provides vnet_hdr */ | |
1004 | vhost_hlen = hdr_len; | |
1005 | sock_hlen = 0; | |
1006 | } else { | |
1007 | /* socket provides vnet_hdr */ | |
1008 | vhost_hlen = 0; | |
1009 | sock_hlen = hdr_len; | |
1010 | } | |
3a4d5c94 MT |
1011 | mutex_lock(&n->dev.mutex); |
1012 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1013 | !vhost_log_access_ok(&n->dev)) { | |
1014 | mutex_unlock(&n->dev.mutex); | |
1015 | return -EFAULT; | |
1016 | } | |
1017 | n->dev.acked_features = features; | |
1018 | smp_wmb(); | |
1019 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { | |
3ab2e420 | 1020 | mutex_lock(&n->vqs[i].vq.mutex); |
81f95a55 MT |
1021 | n->vqs[i].vhost_hlen = vhost_hlen; |
1022 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1023 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 MT |
1024 | } |
1025 | vhost_net_flush(n); | |
1026 | mutex_unlock(&n->dev.mutex); | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, | |
1031 | unsigned long arg) | |
1032 | { | |
1033 | struct vhost_net *n = f->private_data; | |
1034 | void __user *argp = (void __user *)arg; | |
1035 | u64 __user *featurep = argp; | |
1036 | struct vhost_vring_file backend; | |
1037 | u64 features; | |
1038 | int r; | |
d47effe1 | 1039 | |
3a4d5c94 MT |
1040 | switch (ioctl) { |
1041 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1042 | if (copy_from_user(&backend, argp, sizeof backend)) |
1043 | return -EFAULT; | |
3a4d5c94 MT |
1044 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1045 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1046 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1047 | if (copy_to_user(featurep, &features, sizeof features)) |
1048 | return -EFAULT; | |
1049 | return 0; | |
3a4d5c94 | 1050 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1051 | if (copy_from_user(&features, featurep, sizeof features)) |
1052 | return -EFAULT; | |
0dd05a3b | 1053 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1054 | return -EOPNOTSUPP; |
1055 | return vhost_net_set_features(n, features); | |
1056 | case VHOST_RESET_OWNER: | |
1057 | return vhost_net_reset_owner(n); | |
1058 | default: | |
1059 | mutex_lock(&n->dev.mutex); | |
2839400f AH |
1060 | if (ioctl == VHOST_SET_OWNER) { |
1061 | r = vhost_net_set_ubuf_info(n); | |
1062 | if (r) | |
1063 | goto out; | |
1064 | } | |
935cdee7 MT |
1065 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1066 | if (r == -ENOIOCTLCMD) | |
1067 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1068 | else | |
1069 | vhost_net_flush(n); | |
2839400f | 1070 | out: |
3a4d5c94 MT |
1071 | mutex_unlock(&n->dev.mutex); |
1072 | return r; | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | #ifdef CONFIG_COMPAT | |
1077 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1078 | unsigned long arg) | |
1079 | { | |
1080 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1081 | } | |
1082 | #endif | |
1083 | ||
373a83a6 | 1084 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1085 | .owner = THIS_MODULE, |
1086 | .release = vhost_net_release, | |
1087 | .unlocked_ioctl = vhost_net_ioctl, | |
1088 | #ifdef CONFIG_COMPAT | |
1089 | .compat_ioctl = vhost_net_compat_ioctl, | |
1090 | #endif | |
1091 | .open = vhost_net_open, | |
6038f373 | 1092 | .llseek = noop_llseek, |
3a4d5c94 MT |
1093 | }; |
1094 | ||
1095 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1096 | .minor = VHOST_NET_MINOR, |
1097 | .name = "vhost-net", | |
1098 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1099 | }; |
1100 | ||
a8d3782f | 1101 | static int vhost_net_init(void) |
3a4d5c94 | 1102 | { |
bab632d6 MT |
1103 | if (experimental_zcopytx) |
1104 | vhost_enable_zcopy(VHOST_NET_VQ_TX); | |
c23f3445 | 1105 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1106 | } |
1107 | module_init(vhost_net_init); | |
1108 | ||
a8d3782f | 1109 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1110 | { |
1111 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1112 | } |
1113 | module_exit(vhost_net_exit); | |
1114 | ||
1115 | MODULE_VERSION("0.0.1"); | |
1116 | MODULE_LICENSE("GPL v2"); | |
1117 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1118 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1119 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1120 | MODULE_ALIAS("devname:vhost-net"); |