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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 | ||
8570a6e7 AH |
61 | enum { |
62 | VHOST_NET_FEATURES = VHOST_FEATURES | | |
63 | (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) | | |
64 | (1ULL << VIRTIO_NET_F_MRG_RXBUF), | |
65 | }; | |
66 | ||
3a4d5c94 MT |
67 | enum { |
68 | VHOST_NET_VQ_RX = 0, | |
69 | VHOST_NET_VQ_TX = 1, | |
70 | VHOST_NET_VQ_MAX = 2, | |
71 | }; | |
72 | ||
fe729a57 | 73 | struct vhost_net_ubuf_ref { |
2839400f AH |
74 | struct kref kref; |
75 | wait_queue_head_t wait; | |
76 | struct vhost_virtqueue *vq; | |
77 | }; | |
78 | ||
3ab2e420 AH |
79 | struct vhost_net_virtqueue { |
80 | struct vhost_virtqueue vq; | |
81f95a55 MT |
81 | /* hdr is used to store the virtio header. |
82 | * Since each iovec has >= 1 byte length, we never need more than | |
83 | * header length entries to store the header. */ | |
84 | struct iovec hdr[sizeof(struct virtio_net_hdr_mrg_rxbuf)]; | |
85 | size_t vhost_hlen; | |
86 | size_t sock_hlen; | |
2839400f AH |
87 | /* vhost zerocopy support fields below: */ |
88 | /* last used idx for outstanding DMA zerocopy buffers */ | |
89 | int upend_idx; | |
90 | /* first used idx for DMA done zerocopy buffers */ | |
91 | int done_idx; | |
92 | /* an array of userspace buffers info */ | |
93 | struct ubuf_info *ubuf_info; | |
94 | /* Reference counting for outstanding ubufs. | |
95 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 96 | struct vhost_net_ubuf_ref *ubufs; |
3ab2e420 AH |
97 | }; |
98 | ||
3a4d5c94 MT |
99 | struct vhost_net { |
100 | struct vhost_dev dev; | |
3ab2e420 | 101 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 102 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
103 | /* Number of TX recently submitted. |
104 | * Protected by tx vq lock. */ | |
105 | unsigned tx_packets; | |
106 | /* Number of times zerocopy TX recently failed. | |
107 | * Protected by tx vq lock. */ | |
108 | unsigned tx_zcopy_err; | |
1280c27f MT |
109 | /* Flush in progress. Protected by tx vq lock. */ |
110 | bool tx_flush; | |
3a4d5c94 MT |
111 | }; |
112 | ||
fe729a57 | 113 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 114 | |
fe729a57 | 115 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 116 | { |
fe729a57 | 117 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
118 | } |
119 | ||
fe729a57 | 120 | static void vhost_net_zerocopy_done_signal(struct kref *kref) |
2839400f | 121 | { |
fe729a57 AH |
122 | struct vhost_net_ubuf_ref *ubufs; |
123 | ||
124 | ubufs = container_of(kref, struct vhost_net_ubuf_ref, kref); | |
2839400f AH |
125 | wake_up(&ubufs->wait); |
126 | } | |
127 | ||
fe729a57 AH |
128 | static struct vhost_net_ubuf_ref * |
129 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 130 | { |
fe729a57 | 131 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
132 | /* No zero copy backend? Nothing to count. */ |
133 | if (!zcopy) | |
134 | return NULL; | |
135 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
136 | if (!ubufs) | |
137 | return ERR_PTR(-ENOMEM); | |
138 | kref_init(&ubufs->kref); | |
139 | init_waitqueue_head(&ubufs->wait); | |
140 | ubufs->vq = vq; | |
141 | return ubufs; | |
142 | } | |
143 | ||
fe729a57 | 144 | static void vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 145 | { |
fe729a57 | 146 | kref_put(&ubufs->kref, vhost_net_zerocopy_done_signal); |
2839400f AH |
147 | } |
148 | ||
fe729a57 | 149 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 150 | { |
fe729a57 | 151 | kref_put(&ubufs->kref, vhost_net_zerocopy_done_signal); |
2839400f AH |
152 | wait_event(ubufs->wait, !atomic_read(&ubufs->kref.refcount)); |
153 | kfree(ubufs); | |
154 | } | |
155 | ||
b1ad8496 AH |
156 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
157 | { | |
158 | ||
159 | bool zcopy; | |
160 | int i; | |
161 | ||
162 | for (i = 0; i < n->dev.nvqs; ++i) { | |
fe729a57 | 163 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
b1ad8496 AH |
164 | if (zcopy) |
165 | kfree(n->vqs[i].ubuf_info); | |
166 | } | |
167 | } | |
168 | ||
2839400f AH |
169 | int vhost_net_set_ubuf_info(struct vhost_net *n) |
170 | { | |
171 | bool zcopy; | |
172 | int i; | |
173 | ||
174 | for (i = 0; i < n->dev.nvqs; ++i) { | |
fe729a57 | 175 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
176 | if (!zcopy) |
177 | continue; | |
178 | n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * | |
179 | UIO_MAXIOV, GFP_KERNEL); | |
180 | if (!n->vqs[i].ubuf_info) | |
181 | goto err; | |
182 | } | |
183 | return 0; | |
184 | ||
185 | err: | |
186 | while (i--) { | |
fe729a57 | 187 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
188 | if (!zcopy) |
189 | continue; | |
190 | kfree(n->vqs[i].ubuf_info); | |
191 | } | |
192 | return -ENOMEM; | |
193 | } | |
194 | ||
81f95a55 | 195 | void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
196 | { |
197 | int i; | |
198 | ||
199 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { | |
200 | n->vqs[i].done_idx = 0; | |
201 | n->vqs[i].upend_idx = 0; | |
202 | n->vqs[i].ubufs = NULL; | |
203 | kfree(n->vqs[i].ubuf_info); | |
204 | n->vqs[i].ubuf_info = NULL; | |
81f95a55 MT |
205 | n->vqs[i].vhost_hlen = 0; |
206 | n->vqs[i].sock_hlen = 0; | |
2839400f AH |
207 | } |
208 | ||
209 | } | |
210 | ||
eaae8132 MT |
211 | static void vhost_net_tx_packet(struct vhost_net *net) |
212 | { | |
213 | ++net->tx_packets; | |
214 | if (net->tx_packets < 1024) | |
215 | return; | |
216 | net->tx_packets = 0; | |
217 | net->tx_zcopy_err = 0; | |
218 | } | |
219 | ||
220 | static void vhost_net_tx_err(struct vhost_net *net) | |
221 | { | |
222 | ++net->tx_zcopy_err; | |
223 | } | |
224 | ||
225 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
226 | { | |
1280c27f MT |
227 | /* TX flush waits for outstanding DMAs to be done. |
228 | * Don't start new DMAs. | |
229 | */ | |
230 | return !net->tx_flush && | |
231 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
232 | } |
233 | ||
bab632d6 MT |
234 | static bool vhost_sock_zcopy(struct socket *sock) |
235 | { | |
236 | return unlikely(experimental_zcopytx) && | |
237 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
238 | } | |
239 | ||
3a4d5c94 MT |
240 | /* Pop first len bytes from iovec. Return number of segments used. */ |
241 | static int move_iovec_hdr(struct iovec *from, struct iovec *to, | |
242 | size_t len, int iov_count) | |
243 | { | |
244 | int seg = 0; | |
245 | size_t size; | |
d47effe1 | 246 | |
3a4d5c94 MT |
247 | while (len && seg < iov_count) { |
248 | size = min(from->iov_len, len); | |
249 | to->iov_base = from->iov_base; | |
250 | to->iov_len = size; | |
251 | from->iov_len -= size; | |
252 | from->iov_base += size; | |
253 | len -= size; | |
254 | ++from; | |
255 | ++to; | |
256 | ++seg; | |
257 | } | |
258 | return seg; | |
259 | } | |
8dd014ad DS |
260 | /* Copy iovec entries for len bytes from iovec. */ |
261 | static void copy_iovec_hdr(const struct iovec *from, struct iovec *to, | |
262 | size_t len, int iovcount) | |
263 | { | |
264 | int seg = 0; | |
265 | size_t size; | |
d47effe1 | 266 | |
8dd014ad DS |
267 | while (len && seg < iovcount) { |
268 | size = min(from->iov_len, len); | |
269 | to->iov_base = from->iov_base; | |
270 | to->iov_len = size; | |
271 | len -= size; | |
272 | ++from; | |
273 | ++to; | |
274 | ++seg; | |
275 | } | |
276 | } | |
3a4d5c94 | 277 | |
b211616d MT |
278 | /* In case of DMA done not in order in lower device driver for some reason. |
279 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
280 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
281 | * guest used idx. | |
282 | */ | |
eaae8132 MT |
283 | static int vhost_zerocopy_signal_used(struct vhost_net *net, |
284 | struct vhost_virtqueue *vq) | |
b211616d | 285 | { |
2839400f AH |
286 | struct vhost_net_virtqueue *nvq = |
287 | container_of(vq, struct vhost_net_virtqueue, vq); | |
b211616d MT |
288 | int i; |
289 | int j = 0; | |
290 | ||
2839400f | 291 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
292 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
293 | vhost_net_tx_err(net); | |
b211616d MT |
294 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
295 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
296 | vhost_add_used_and_signal(vq->dev, vq, | |
297 | vq->heads[i].id, 0); | |
298 | ++j; | |
299 | } else | |
300 | break; | |
301 | } | |
302 | if (j) | |
2839400f | 303 | nvq->done_idx = i; |
b211616d MT |
304 | return j; |
305 | } | |
306 | ||
eaae8132 | 307 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 308 | { |
fe729a57 | 309 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 310 | struct vhost_virtqueue *vq = ubufs->vq; |
24eb21a1 MT |
311 | int cnt = atomic_read(&ubufs->kref.refcount); |
312 | ||
313 | /* | |
314 | * Trigger polling thread if guest stopped submitting new buffers: | |
315 | * in this case, the refcount after decrement will eventually reach 1 | |
316 | * so here it is 2. | |
317 | * We also trigger polling periodically after each 16 packets | |
318 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
319 | * less than 10% of times). | |
320 | */ | |
321 | if (cnt <= 2 || !(cnt % 16)) | |
322 | vhost_poll_queue(&vq->poll); | |
b211616d | 323 | /* set len to mark this desc buffers done DMA */ |
eaae8132 MT |
324 | vq->heads[ubuf->desc].len = success ? |
325 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
fe729a57 | 326 | vhost_net_ubuf_put(ubufs); |
b211616d MT |
327 | } |
328 | ||
3a4d5c94 MT |
329 | /* Expects to be always run from workqueue - which acts as |
330 | * read-size critical section for our kind of RCU. */ | |
331 | static void handle_tx(struct vhost_net *net) | |
332 | { | |
2839400f | 333 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 334 | struct vhost_virtqueue *vq = &nvq->vq; |
d5675bd2 MT |
335 | unsigned out, in, s; |
336 | int head; | |
3a4d5c94 MT |
337 | struct msghdr msg = { |
338 | .msg_name = NULL, | |
339 | .msg_namelen = 0, | |
340 | .msg_control = NULL, | |
341 | .msg_controllen = 0, | |
342 | .msg_iov = vq->iov, | |
343 | .msg_flags = MSG_DONTWAIT, | |
344 | }; | |
345 | size_t len, total_len = 0; | |
70181d51 | 346 | int err; |
3a4d5c94 | 347 | size_t hdr_size; |
28457ee6 | 348 | struct socket *sock; |
fe729a57 | 349 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 350 | bool zcopy, zcopy_used; |
28457ee6 | 351 | |
5e18247b | 352 | /* TODO: check that we are running from vhost_worker? */ |
11cd1a8b | 353 | sock = rcu_dereference_check(vq->private_data, 1); |
3a4d5c94 MT |
354 | if (!sock) |
355 | return; | |
356 | ||
3a4d5c94 | 357 | mutex_lock(&vq->mutex); |
8ea8cf89 | 358 | vhost_disable_notify(&net->dev, vq); |
3a4d5c94 | 359 | |
81f95a55 | 360 | hdr_size = nvq->vhost_hlen; |
2839400f | 361 | zcopy = nvq->ubufs; |
3a4d5c94 MT |
362 | |
363 | for (;;) { | |
bab632d6 MT |
364 | /* Release DMAs done buffers first */ |
365 | if (zcopy) | |
eaae8132 | 366 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 367 | |
3a4d5c94 MT |
368 | head = vhost_get_vq_desc(&net->dev, vq, vq->iov, |
369 | ARRAY_SIZE(vq->iov), | |
370 | &out, &in, | |
371 | NULL, NULL); | |
d5675bd2 | 372 | /* On error, stop handling until the next kick. */ |
7b3384fc | 373 | if (unlikely(head < 0)) |
d5675bd2 | 374 | break; |
3a4d5c94 MT |
375 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
376 | if (head == vq->num) { | |
9e380825 SM |
377 | int num_pends; |
378 | ||
9e380825 SM |
379 | /* If more outstanding DMAs, queue the work. |
380 | * Handle upend_idx wrap around | |
381 | */ | |
2839400f AH |
382 | num_pends = likely(nvq->upend_idx >= nvq->done_idx) ? |
383 | (nvq->upend_idx - nvq->done_idx) : | |
384 | (nvq->upend_idx + UIO_MAXIOV - | |
385 | nvq->done_idx); | |
70181d51 | 386 | if (unlikely(num_pends > VHOST_MAX_PEND)) |
bab632d6 | 387 | break; |
8ea8cf89 MT |
388 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
389 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
390 | continue; |
391 | } | |
392 | break; | |
393 | } | |
394 | if (in) { | |
395 | vq_err(vq, "Unexpected descriptor format for TX: " | |
396 | "out %d, int %d\n", out, in); | |
397 | break; | |
398 | } | |
399 | /* Skip header. TODO: support TSO. */ | |
81f95a55 | 400 | s = move_iovec_hdr(vq->iov, nvq->hdr, hdr_size, out); |
3a4d5c94 MT |
401 | msg.msg_iovlen = out; |
402 | len = iov_length(vq->iov, out); | |
403 | /* Sanity check */ | |
404 | if (!len) { | |
405 | vq_err(vq, "Unexpected header len for TX: " | |
406 | "%zd expected %zd\n", | |
81f95a55 | 407 | iov_length(nvq->hdr, s), hdr_size); |
3a4d5c94 MT |
408 | break; |
409 | } | |
cedb9bdc | 410 | zcopy_used = zcopy && (len >= VHOST_GOODCOPY_LEN || |
2839400f | 411 | nvq->upend_idx != nvq->done_idx); |
cedb9bdc | 412 | |
bab632d6 | 413 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 414 | if (zcopy_used) { |
2839400f | 415 | vq->heads[nvq->upend_idx].id = head; |
eaae8132 MT |
416 | if (!vhost_net_tx_select_zcopy(net) || |
417 | len < VHOST_GOODCOPY_LEN) { | |
bab632d6 | 418 | /* copy don't need to wait for DMA done */ |
2839400f | 419 | vq->heads[nvq->upend_idx].len = |
bab632d6 MT |
420 | VHOST_DMA_DONE_LEN; |
421 | msg.msg_control = NULL; | |
422 | msg.msg_controllen = 0; | |
423 | ubufs = NULL; | |
424 | } else { | |
46aa92d1 | 425 | struct ubuf_info *ubuf; |
2839400f | 426 | ubuf = nvq->ubuf_info + nvq->upend_idx; |
bab632d6 | 427 | |
2839400f | 428 | vq->heads[nvq->upend_idx].len = |
70e4cb9a | 429 | VHOST_DMA_IN_PROGRESS; |
bab632d6 | 430 | ubuf->callback = vhost_zerocopy_callback; |
2839400f AH |
431 | ubuf->ctx = nvq->ubufs; |
432 | ubuf->desc = nvq->upend_idx; | |
bab632d6 MT |
433 | msg.msg_control = ubuf; |
434 | msg.msg_controllen = sizeof(ubuf); | |
2839400f | 435 | ubufs = nvq->ubufs; |
bab632d6 MT |
436 | kref_get(&ubufs->kref); |
437 | } | |
2839400f | 438 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
4364d5f9 JW |
439 | } else |
440 | msg.msg_control = NULL; | |
3a4d5c94 MT |
441 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
442 | err = sock->ops->sendmsg(NULL, sock, &msg, len); | |
443 | if (unlikely(err < 0)) { | |
cedb9bdc | 444 | if (zcopy_used) { |
bab632d6 | 445 | if (ubufs) |
fe729a57 | 446 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
447 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
448 | % UIO_MAXIOV; | |
bab632d6 | 449 | } |
8dd014ad | 450 | vhost_discard_vq_desc(vq, 1); |
3a4d5c94 MT |
451 | break; |
452 | } | |
453 | if (err != len) | |
95c0ec6a MT |
454 | pr_debug("Truncated TX packet: " |
455 | " len %d != %zd\n", err, len); | |
cedb9bdc | 456 | if (!zcopy_used) |
bab632d6 | 457 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 458 | else |
eaae8132 | 459 | vhost_zerocopy_signal_used(net, vq); |
3a4d5c94 | 460 | total_len += len; |
eaae8132 | 461 | vhost_net_tx_packet(net); |
3a4d5c94 MT |
462 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
463 | vhost_poll_queue(&vq->poll); | |
464 | break; | |
465 | } | |
466 | } | |
467 | ||
468 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
469 | } |
470 | ||
8dd014ad DS |
471 | static int peek_head_len(struct sock *sk) |
472 | { | |
473 | struct sk_buff *head; | |
474 | int len = 0; | |
783e3988 | 475 | unsigned long flags; |
8dd014ad | 476 | |
783e3988 | 477 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 478 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 479 | if (likely(head)) { |
8dd014ad | 480 | len = head->len; |
c53cff5e BG |
481 | if (vlan_tx_tag_present(head)) |
482 | len += VLAN_HLEN; | |
483 | } | |
484 | ||
783e3988 | 485 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
486 | return len; |
487 | } | |
488 | ||
489 | /* This is a multi-buffer version of vhost_get_desc, that works if | |
490 | * vq has read descriptors only. | |
491 | * @vq - the relevant virtqueue | |
492 | * @datalen - data length we'll be reading | |
493 | * @iovcount - returned count of io vectors we fill | |
494 | * @log - vhost log | |
495 | * @log_num - log offset | |
94249369 | 496 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
497 | * returns number of buffer heads allocated, negative on error |
498 | */ | |
499 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
500 | struct vring_used_elem *heads, | |
501 | int datalen, | |
502 | unsigned *iovcount, | |
503 | struct vhost_log *log, | |
94249369 JW |
504 | unsigned *log_num, |
505 | unsigned int quota) | |
8dd014ad DS |
506 | { |
507 | unsigned int out, in; | |
508 | int seg = 0; | |
509 | int headcount = 0; | |
510 | unsigned d; | |
511 | int r, nlogs = 0; | |
512 | ||
94249369 | 513 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 514 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
515 | r = -ENOBUFS; |
516 | goto err; | |
517 | } | |
518 | d = vhost_get_vq_desc(vq->dev, vq, vq->iov + seg, | |
519 | ARRAY_SIZE(vq->iov) - seg, &out, | |
520 | &in, log, log_num); | |
521 | if (d == vq->num) { | |
522 | r = 0; | |
523 | goto err; | |
524 | } | |
525 | if (unlikely(out || in <= 0)) { | |
526 | vq_err(vq, "unexpected descriptor format for RX: " | |
527 | "out %d, in %d\n", out, in); | |
528 | r = -EINVAL; | |
529 | goto err; | |
530 | } | |
531 | if (unlikely(log)) { | |
532 | nlogs += *log_num; | |
533 | log += *log_num; | |
534 | } | |
535 | heads[headcount].id = d; | |
536 | heads[headcount].len = iov_length(vq->iov + seg, in); | |
537 | datalen -= heads[headcount].len; | |
538 | ++headcount; | |
539 | seg += in; | |
540 | } | |
541 | heads[headcount - 1].len += datalen; | |
542 | *iovcount = seg; | |
543 | if (unlikely(log)) | |
544 | *log_num = nlogs; | |
545 | return headcount; | |
546 | err: | |
547 | vhost_discard_vq_desc(vq, headcount); | |
548 | return r; | |
549 | } | |
550 | ||
3a4d5c94 MT |
551 | /* Expects to be always run from workqueue - which acts as |
552 | * read-size critical section for our kind of RCU. */ | |
94249369 | 553 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 554 | { |
81f95a55 MT |
555 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
556 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
557 | unsigned uninitialized_var(in), log; |
558 | struct vhost_log *vq_log; | |
559 | struct msghdr msg = { | |
560 | .msg_name = NULL, | |
561 | .msg_namelen = 0, | |
562 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
563 | .msg_controllen = 0, | |
564 | .msg_iov = vq->iov, | |
565 | .msg_flags = MSG_DONTWAIT, | |
566 | }; | |
8dd014ad DS |
567 | struct virtio_net_hdr_mrg_rxbuf hdr = { |
568 | .hdr.flags = 0, | |
569 | .hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE | |
570 | }; | |
8dd014ad | 571 | size_t total_len = 0; |
910a578f MT |
572 | int err, mergeable; |
573 | s16 headcount; | |
8dd014ad DS |
574 | size_t vhost_hlen, sock_hlen; |
575 | size_t vhost_len, sock_len; | |
5e18247b MT |
576 | /* TODO: check that we are running from vhost_worker? */ |
577 | struct socket *sock = rcu_dereference_check(vq->private_data, 1); | |
d47effe1 | 578 | |
de4d768a | 579 | if (!sock) |
8dd014ad DS |
580 | return; |
581 | ||
8dd014ad | 582 | mutex_lock(&vq->mutex); |
8ea8cf89 | 583 | vhost_disable_notify(&net->dev, vq); |
81f95a55 MT |
584 | vhost_hlen = nvq->vhost_hlen; |
585 | sock_hlen = nvq->sock_hlen; | |
8dd014ad DS |
586 | |
587 | vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ? | |
588 | vq->log : NULL; | |
cfbdab95 | 589 | mergeable = vhost_has_feature(&net->dev, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad DS |
590 | |
591 | while ((sock_len = peek_head_len(sock->sk))) { | |
592 | sock_len += sock_hlen; | |
593 | vhost_len = sock_len + vhost_hlen; | |
594 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, | |
94249369 JW |
595 | &in, vq_log, &log, |
596 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
597 | /* On error, stop handling until the next kick. */ |
598 | if (unlikely(headcount < 0)) | |
599 | break; | |
600 | /* OK, now we need to know about added descriptors. */ | |
601 | if (!headcount) { | |
8ea8cf89 | 602 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
603 | /* They have slipped one in as we were |
604 | * doing that: check again. */ | |
8ea8cf89 | 605 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
606 | continue; |
607 | } | |
608 | /* Nothing new? Wait for eventfd to tell us | |
609 | * they refilled. */ | |
610 | break; | |
611 | } | |
612 | /* We don't need to be notified again. */ | |
613 | if (unlikely((vhost_hlen))) | |
614 | /* Skip header. TODO: support TSO. */ | |
81f95a55 | 615 | move_iovec_hdr(vq->iov, nvq->hdr, vhost_hlen, in); |
8dd014ad DS |
616 | else |
617 | /* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF: | |
a290aec8 | 618 | * needed because recvmsg can modify msg_iov. */ |
81f95a55 | 619 | copy_iovec_hdr(vq->iov, nvq->hdr, sock_hlen, in); |
8dd014ad DS |
620 | msg.msg_iovlen = in; |
621 | err = sock->ops->recvmsg(NULL, sock, &msg, | |
622 | sock_len, MSG_DONTWAIT | MSG_TRUNC); | |
623 | /* Userspace might have consumed the packet meanwhile: | |
624 | * it's not supposed to do this usually, but might be hard | |
625 | * to prevent. Discard data we got (if any) and keep going. */ | |
626 | if (unlikely(err != sock_len)) { | |
627 | pr_debug("Discarded rx packet: " | |
628 | " len %d, expected %zd\n", err, sock_len); | |
629 | vhost_discard_vq_desc(vq, headcount); | |
630 | continue; | |
631 | } | |
632 | if (unlikely(vhost_hlen) && | |
81f95a55 | 633 | memcpy_toiovecend(nvq->hdr, (unsigned char *)&hdr, 0, |
8dd014ad DS |
634 | vhost_hlen)) { |
635 | vq_err(vq, "Unable to write vnet_hdr at addr %p\n", | |
636 | vq->iov->iov_base); | |
637 | break; | |
638 | } | |
639 | /* TODO: Should check and handle checksum. */ | |
cfbdab95 | 640 | if (likely(mergeable) && |
81f95a55 | 641 | memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount, |
8dd014ad DS |
642 | offsetof(typeof(hdr), num_buffers), |
643 | sizeof hdr.num_buffers)) { | |
644 | vq_err(vq, "Failed num_buffers write"); | |
645 | vhost_discard_vq_desc(vq, headcount); | |
646 | break; | |
647 | } | |
648 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
649 | headcount); | |
650 | if (unlikely(vq_log)) | |
651 | vhost_log_write(vq, vq_log, log, vhost_len); | |
652 | total_len += vhost_len; | |
653 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
654 | vhost_poll_queue(&vq->poll); | |
655 | break; | |
656 | } | |
657 | } | |
658 | ||
659 | mutex_unlock(&vq->mutex); | |
8dd014ad DS |
660 | } |
661 | ||
c23f3445 | 662 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 663 | { |
c23f3445 TH |
664 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
665 | poll.work); | |
666 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
667 | ||
3a4d5c94 MT |
668 | handle_tx(net); |
669 | } | |
670 | ||
c23f3445 | 671 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 672 | { |
c23f3445 TH |
673 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
674 | poll.work); | |
675 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
676 | ||
3a4d5c94 MT |
677 | handle_rx(net); |
678 | } | |
679 | ||
c23f3445 | 680 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 681 | { |
c23f3445 TH |
682 | struct vhost_net *net = container_of(work, struct vhost_net, |
683 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
684 | handle_tx(net); |
685 | } | |
686 | ||
c23f3445 | 687 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 688 | { |
c23f3445 TH |
689 | struct vhost_net *net = container_of(work, struct vhost_net, |
690 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
691 | handle_rx(net); |
692 | } | |
693 | ||
694 | static int vhost_net_open(struct inode *inode, struct file *f) | |
695 | { | |
696 | struct vhost_net *n = kmalloc(sizeof *n, GFP_KERNEL); | |
c23f3445 | 697 | struct vhost_dev *dev; |
3ab2e420 | 698 | struct vhost_virtqueue **vqs; |
2839400f | 699 | int r, i; |
c23f3445 | 700 | |
3a4d5c94 MT |
701 | if (!n) |
702 | return -ENOMEM; | |
3ab2e420 AH |
703 | vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
704 | if (!vqs) { | |
705 | kfree(n); | |
706 | return -ENOMEM; | |
707 | } | |
c23f3445 TH |
708 | |
709 | dev = &n->dev; | |
3ab2e420 AH |
710 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
711 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
712 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
713 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
714 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
715 | n->vqs[i].ubufs = NULL; | |
716 | n->vqs[i].ubuf_info = NULL; | |
717 | n->vqs[i].upend_idx = 0; | |
718 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
719 | n->vqs[i].vhost_hlen = 0; |
720 | n->vqs[i].sock_hlen = 0; | |
2839400f | 721 | } |
3ab2e420 | 722 | r = vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 MT |
723 | if (r < 0) { |
724 | kfree(n); | |
3ab2e420 | 725 | kfree(vqs); |
3a4d5c94 MT |
726 | return r; |
727 | } | |
728 | ||
c23f3445 TH |
729 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
730 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); | |
3a4d5c94 MT |
731 | |
732 | f->private_data = n; | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
737 | static void vhost_net_disable_vq(struct vhost_net *n, | |
738 | struct vhost_virtqueue *vq) | |
739 | { | |
3ab2e420 AH |
740 | struct vhost_net_virtqueue *nvq = |
741 | container_of(vq, struct vhost_net_virtqueue, vq); | |
742 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
3a4d5c94 MT |
743 | if (!vq->private_data) |
744 | return; | |
70181d51 | 745 | vhost_poll_stop(poll); |
3a4d5c94 MT |
746 | } |
747 | ||
2b8b328b | 748 | static int vhost_net_enable_vq(struct vhost_net *n, |
3a4d5c94 MT |
749 | struct vhost_virtqueue *vq) |
750 | { | |
3ab2e420 AH |
751 | struct vhost_net_virtqueue *nvq = |
752 | container_of(vq, struct vhost_net_virtqueue, vq); | |
753 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
28457ee6 AB |
754 | struct socket *sock; |
755 | ||
756 | sock = rcu_dereference_protected(vq->private_data, | |
757 | lockdep_is_held(&vq->mutex)); | |
3a4d5c94 | 758 | if (!sock) |
2b8b328b | 759 | return 0; |
2b8b328b | 760 | |
70181d51 | 761 | return vhost_poll_start(poll, sock->file); |
3a4d5c94 MT |
762 | } |
763 | ||
764 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, | |
765 | struct vhost_virtqueue *vq) | |
766 | { | |
767 | struct socket *sock; | |
768 | ||
769 | mutex_lock(&vq->mutex); | |
28457ee6 AB |
770 | sock = rcu_dereference_protected(vq->private_data, |
771 | lockdep_is_held(&vq->mutex)); | |
3a4d5c94 MT |
772 | vhost_net_disable_vq(n, vq); |
773 | rcu_assign_pointer(vq->private_data, NULL); | |
774 | mutex_unlock(&vq->mutex); | |
775 | return sock; | |
776 | } | |
777 | ||
778 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
779 | struct socket **rx_sock) | |
780 | { | |
3ab2e420 AH |
781 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
782 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
783 | } |
784 | ||
785 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
786 | { | |
787 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 788 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
789 | } |
790 | ||
791 | static void vhost_net_flush(struct vhost_net *n) | |
792 | { | |
793 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
794 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 795 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 796 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 797 | n->tx_flush = true; |
3ab2e420 | 798 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 799 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 800 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 801 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 802 | n->tx_flush = false; |
2839400f | 803 | kref_init(&n->vqs[VHOST_NET_VQ_TX].ubufs->kref); |
3ab2e420 | 804 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 805 | } |
3a4d5c94 MT |
806 | } |
807 | ||
808 | static int vhost_net_release(struct inode *inode, struct file *f) | |
809 | { | |
810 | struct vhost_net *n = f->private_data; | |
811 | struct socket *tx_sock; | |
812 | struct socket *rx_sock; | |
813 | ||
814 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
815 | vhost_net_flush(n); | |
b211616d | 816 | vhost_dev_stop(&n->dev); |
ea5d4046 | 817 | vhost_dev_cleanup(&n->dev, false); |
81f95a55 | 818 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
819 | if (tx_sock) |
820 | fput(tx_sock->file); | |
821 | if (rx_sock) | |
822 | fput(rx_sock->file); | |
823 | /* We do an extra flush before freeing memory, | |
824 | * since jobs can re-queue themselves. */ | |
825 | vhost_net_flush(n); | |
3ab2e420 | 826 | kfree(n->dev.vqs); |
3a4d5c94 MT |
827 | kfree(n); |
828 | return 0; | |
829 | } | |
830 | ||
831 | static struct socket *get_raw_socket(int fd) | |
832 | { | |
833 | struct { | |
834 | struct sockaddr_ll sa; | |
835 | char buf[MAX_ADDR_LEN]; | |
836 | } uaddr; | |
837 | int uaddr_len = sizeof uaddr, r; | |
838 | struct socket *sock = sockfd_lookup(fd, &r); | |
d47effe1 | 839 | |
3a4d5c94 MT |
840 | if (!sock) |
841 | return ERR_PTR(-ENOTSOCK); | |
842 | ||
843 | /* Parameter checking */ | |
844 | if (sock->sk->sk_type != SOCK_RAW) { | |
845 | r = -ESOCKTNOSUPPORT; | |
846 | goto err; | |
847 | } | |
848 | ||
849 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
850 | &uaddr_len, 0); | |
851 | if (r) | |
852 | goto err; | |
853 | ||
854 | if (uaddr.sa.sll_family != AF_PACKET) { | |
855 | r = -EPFNOSUPPORT; | |
856 | goto err; | |
857 | } | |
858 | return sock; | |
859 | err: | |
860 | fput(sock->file); | |
861 | return ERR_PTR(r); | |
862 | } | |
863 | ||
501c774c | 864 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
865 | { |
866 | struct file *file = fget(fd); | |
867 | struct socket *sock; | |
d47effe1 | 868 | |
3a4d5c94 MT |
869 | if (!file) |
870 | return ERR_PTR(-EBADF); | |
871 | sock = tun_get_socket(file); | |
501c774c AB |
872 | if (!IS_ERR(sock)) |
873 | return sock; | |
874 | sock = macvtap_get_socket(file); | |
3a4d5c94 MT |
875 | if (IS_ERR(sock)) |
876 | fput(file); | |
877 | return sock; | |
878 | } | |
879 | ||
880 | static struct socket *get_socket(int fd) | |
881 | { | |
882 | struct socket *sock; | |
d47effe1 | 883 | |
3a4d5c94 MT |
884 | /* special case to disable backend */ |
885 | if (fd == -1) | |
886 | return NULL; | |
887 | sock = get_raw_socket(fd); | |
888 | if (!IS_ERR(sock)) | |
889 | return sock; | |
501c774c | 890 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
891 | if (!IS_ERR(sock)) |
892 | return sock; | |
893 | return ERR_PTR(-ENOTSOCK); | |
894 | } | |
895 | ||
896 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
897 | { | |
898 | struct socket *sock, *oldsock; | |
899 | struct vhost_virtqueue *vq; | |
2839400f | 900 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 901 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
902 | int r; |
903 | ||
904 | mutex_lock(&n->dev.mutex); | |
905 | r = vhost_dev_check_owner(&n->dev); | |
906 | if (r) | |
907 | goto err; | |
908 | ||
909 | if (index >= VHOST_NET_VQ_MAX) { | |
910 | r = -ENOBUFS; | |
911 | goto err; | |
912 | } | |
3ab2e420 | 913 | vq = &n->vqs[index].vq; |
2839400f | 914 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
915 | mutex_lock(&vq->mutex); |
916 | ||
917 | /* Verify that ring has been setup correctly. */ | |
918 | if (!vhost_vq_access_ok(vq)) { | |
919 | r = -EFAULT; | |
1dace8c8 | 920 | goto err_vq; |
3a4d5c94 MT |
921 | } |
922 | sock = get_socket(fd); | |
923 | if (IS_ERR(sock)) { | |
924 | r = PTR_ERR(sock); | |
1dace8c8 | 925 | goto err_vq; |
3a4d5c94 MT |
926 | } |
927 | ||
928 | /* start polling new socket */ | |
28457ee6 AB |
929 | oldsock = rcu_dereference_protected(vq->private_data, |
930 | lockdep_is_held(&vq->mutex)); | |
11fe8839 | 931 | if (sock != oldsock) { |
fe729a57 AH |
932 | ubufs = vhost_net_ubuf_alloc(vq, |
933 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
934 | if (IS_ERR(ubufs)) { |
935 | r = PTR_ERR(ubufs); | |
936 | goto err_ubufs; | |
937 | } | |
692a998b | 938 | |
d47effe1 KK |
939 | vhost_net_disable_vq(n, vq); |
940 | rcu_assign_pointer(vq->private_data, sock); | |
f59281da JW |
941 | r = vhost_init_used(vq); |
942 | if (r) | |
692a998b | 943 | goto err_used; |
2b8b328b JW |
944 | r = vhost_net_enable_vq(n, vq); |
945 | if (r) | |
946 | goto err_used; | |
692a998b | 947 | |
2839400f AH |
948 | oldubufs = nvq->ubufs; |
949 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
950 | |
951 | n->tx_packets = 0; | |
952 | n->tx_zcopy_err = 0; | |
1280c27f | 953 | n->tx_flush = false; |
dd1f4078 | 954 | } |
3a4d5c94 | 955 | |
1680e906 MT |
956 | mutex_unlock(&vq->mutex); |
957 | ||
c047e5f3 | 958 | if (oldubufs) { |
fe729a57 | 959 | vhost_net_ubuf_put_and_wait(oldubufs); |
c047e5f3 | 960 | mutex_lock(&vq->mutex); |
eaae8132 | 961 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
962 | mutex_unlock(&vq->mutex); |
963 | } | |
bab632d6 | 964 | |
3a4d5c94 MT |
965 | if (oldsock) { |
966 | vhost_net_flush_vq(n, index); | |
967 | fput(oldsock->file); | |
968 | } | |
1dace8c8 | 969 | |
1680e906 MT |
970 | mutex_unlock(&n->dev.mutex); |
971 | return 0; | |
972 | ||
692a998b JW |
973 | err_used: |
974 | rcu_assign_pointer(vq->private_data, oldsock); | |
975 | vhost_net_enable_vq(n, vq); | |
976 | if (ubufs) | |
fe729a57 | 977 | vhost_net_ubuf_put_and_wait(ubufs); |
bab632d6 MT |
978 | err_ubufs: |
979 | fput(sock->file); | |
1dace8c8 JD |
980 | err_vq: |
981 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
982 | err: |
983 | mutex_unlock(&n->dev.mutex); | |
984 | return r; | |
985 | } | |
986 | ||
987 | static long vhost_net_reset_owner(struct vhost_net *n) | |
988 | { | |
989 | struct socket *tx_sock = NULL; | |
990 | struct socket *rx_sock = NULL; | |
991 | long err; | |
150b9e51 | 992 | struct vhost_memory *memory; |
d47effe1 | 993 | |
3a4d5c94 MT |
994 | mutex_lock(&n->dev.mutex); |
995 | err = vhost_dev_check_owner(&n->dev); | |
996 | if (err) | |
997 | goto done; | |
150b9e51 MT |
998 | memory = vhost_dev_reset_owner_prepare(); |
999 | if (!memory) { | |
1000 | err = -ENOMEM; | |
1001 | goto done; | |
1002 | } | |
3a4d5c94 MT |
1003 | vhost_net_stop(n, &tx_sock, &rx_sock); |
1004 | vhost_net_flush(n); | |
150b9e51 | 1005 | vhost_dev_reset_owner(&n->dev, memory); |
81f95a55 | 1006 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
1007 | done: |
1008 | mutex_unlock(&n->dev.mutex); | |
1009 | if (tx_sock) | |
1010 | fput(tx_sock->file); | |
1011 | if (rx_sock) | |
1012 | fput(rx_sock->file); | |
1013 | return err; | |
1014 | } | |
1015 | ||
1016 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
1017 | { | |
8dd014ad | 1018 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1019 | int i; |
8dd014ad DS |
1020 | |
1021 | hdr_len = (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? | |
1022 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : | |
1023 | sizeof(struct virtio_net_hdr); | |
1024 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1025 | /* vhost provides vnet_hdr */ | |
1026 | vhost_hlen = hdr_len; | |
1027 | sock_hlen = 0; | |
1028 | } else { | |
1029 | /* socket provides vnet_hdr */ | |
1030 | vhost_hlen = 0; | |
1031 | sock_hlen = hdr_len; | |
1032 | } | |
3a4d5c94 MT |
1033 | mutex_lock(&n->dev.mutex); |
1034 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1035 | !vhost_log_access_ok(&n->dev)) { | |
1036 | mutex_unlock(&n->dev.mutex); | |
1037 | return -EFAULT; | |
1038 | } | |
1039 | n->dev.acked_features = features; | |
1040 | smp_wmb(); | |
1041 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { | |
3ab2e420 | 1042 | mutex_lock(&n->vqs[i].vq.mutex); |
81f95a55 MT |
1043 | n->vqs[i].vhost_hlen = vhost_hlen; |
1044 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1045 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 MT |
1046 | } |
1047 | vhost_net_flush(n); | |
1048 | mutex_unlock(&n->dev.mutex); | |
1049 | return 0; | |
1050 | } | |
1051 | ||
b1ad8496 AH |
1052 | static long vhost_net_set_owner(struct vhost_net *n) |
1053 | { | |
1054 | int r; | |
1055 | ||
1056 | mutex_lock(&n->dev.mutex); | |
1057 | r = vhost_net_set_ubuf_info(n); | |
1058 | if (r) | |
1059 | goto out; | |
1060 | r = vhost_dev_set_owner(&n->dev); | |
1061 | if (r) | |
1062 | vhost_net_clear_ubuf_info(n); | |
1063 | vhost_net_flush(n); | |
1064 | out: | |
1065 | mutex_unlock(&n->dev.mutex); | |
1066 | return r; | |
1067 | } | |
1068 | ||
3a4d5c94 MT |
1069 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1070 | unsigned long arg) | |
1071 | { | |
1072 | struct vhost_net *n = f->private_data; | |
1073 | void __user *argp = (void __user *)arg; | |
1074 | u64 __user *featurep = argp; | |
1075 | struct vhost_vring_file backend; | |
1076 | u64 features; | |
1077 | int r; | |
d47effe1 | 1078 | |
3a4d5c94 MT |
1079 | switch (ioctl) { |
1080 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1081 | if (copy_from_user(&backend, argp, sizeof backend)) |
1082 | return -EFAULT; | |
3a4d5c94 MT |
1083 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1084 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1085 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1086 | if (copy_to_user(featurep, &features, sizeof features)) |
1087 | return -EFAULT; | |
1088 | return 0; | |
3a4d5c94 | 1089 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1090 | if (copy_from_user(&features, featurep, sizeof features)) |
1091 | return -EFAULT; | |
0dd05a3b | 1092 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1093 | return -EOPNOTSUPP; |
1094 | return vhost_net_set_features(n, features); | |
1095 | case VHOST_RESET_OWNER: | |
1096 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1097 | case VHOST_SET_OWNER: |
1098 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1099 | default: |
1100 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1101 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1102 | if (r == -ENOIOCTLCMD) | |
1103 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1104 | else | |
1105 | vhost_net_flush(n); | |
3a4d5c94 MT |
1106 | mutex_unlock(&n->dev.mutex); |
1107 | return r; | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | #ifdef CONFIG_COMPAT | |
1112 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1113 | unsigned long arg) | |
1114 | { | |
1115 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1116 | } | |
1117 | #endif | |
1118 | ||
373a83a6 | 1119 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1120 | .owner = THIS_MODULE, |
1121 | .release = vhost_net_release, | |
1122 | .unlocked_ioctl = vhost_net_ioctl, | |
1123 | #ifdef CONFIG_COMPAT | |
1124 | .compat_ioctl = vhost_net_compat_ioctl, | |
1125 | #endif | |
1126 | .open = vhost_net_open, | |
6038f373 | 1127 | .llseek = noop_llseek, |
3a4d5c94 MT |
1128 | }; |
1129 | ||
1130 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1131 | .minor = VHOST_NET_MINOR, |
1132 | .name = "vhost-net", | |
1133 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1134 | }; |
1135 | ||
a8d3782f | 1136 | static int vhost_net_init(void) |
3a4d5c94 | 1137 | { |
bab632d6 | 1138 | if (experimental_zcopytx) |
fe729a57 | 1139 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1140 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1141 | } |
1142 | module_init(vhost_net_init); | |
1143 | ||
a8d3782f | 1144 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1145 | { |
1146 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1147 | } |
1148 | module_exit(vhost_net_exit); | |
1149 | ||
1150 | MODULE_VERSION("0.0.1"); | |
1151 | MODULE_LICENSE("GPL v2"); | |
1152 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1153 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1154 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1155 | MODULE_ALIAS("devname:vhost-net"); |