Commit | Line | Data |
---|---|---|
3a4d5c94 MT |
1 | /* Copyright (C) 2009 Red Hat, Inc. |
2 | * Author: Michael S. Tsirkin <mst@redhat.com> | |
3 | * | |
4 | * This work is licensed under the terms of the GNU GPL, version 2. | |
5 | * | |
6 | * virtio-net server in host kernel. | |
7 | */ | |
8 | ||
9 | #include <linux/compat.h> | |
10 | #include <linux/eventfd.h> | |
11 | #include <linux/vhost.h> | |
12 | #include <linux/virtio_net.h> | |
3a4d5c94 MT |
13 | #include <linux/miscdevice.h> |
14 | #include <linux/module.h> | |
bab632d6 | 15 | #include <linux/moduleparam.h> |
3a4d5c94 MT |
16 | #include <linux/mutex.h> |
17 | #include <linux/workqueue.h> | |
3a4d5c94 | 18 | #include <linux/file.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
3a4d5c94 MT |
20 | |
21 | #include <linux/net.h> | |
22 | #include <linux/if_packet.h> | |
23 | #include <linux/if_arp.h> | |
24 | #include <linux/if_tun.h> | |
501c774c | 25 | #include <linux/if_macvlan.h> |
c53cff5e | 26 | #include <linux/if_vlan.h> |
3a4d5c94 MT |
27 | |
28 | #include <net/sock.h> | |
29 | ||
30 | #include "vhost.h" | |
31 | ||
f9611c43 | 32 | static int experimental_zcopytx = 1; |
bab632d6 | 33 | module_param(experimental_zcopytx, int, 0444); |
f9611c43 MT |
34 | MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;" |
35 | " 1 -Enable; 0 - Disable"); | |
bab632d6 | 36 | |
3a4d5c94 MT |
37 | /* Max number of bytes transferred before requeueing the job. |
38 | * Using this limit prevents one virtqueue from starving others. */ | |
39 | #define VHOST_NET_WEIGHT 0x80000 | |
40 | ||
bab632d6 MT |
41 | /* MAX number of TX used buffers for outstanding zerocopy */ |
42 | #define VHOST_MAX_PEND 128 | |
43 | #define VHOST_GOODCOPY_LEN 256 | |
44 | ||
eaae8132 MT |
45 | /* |
46 | * For transmit, used buffer len is unused; we override it to track buffer | |
47 | * status internally; used for zerocopy tx only. | |
48 | */ | |
49 | /* Lower device DMA failed */ | |
50 | #define VHOST_DMA_FAILED_LEN 3 | |
51 | /* Lower device DMA done */ | |
52 | #define VHOST_DMA_DONE_LEN 2 | |
53 | /* Lower device DMA in progress */ | |
54 | #define VHOST_DMA_IN_PROGRESS 1 | |
55 | /* Buffer unused */ | |
56 | #define VHOST_DMA_CLEAR_LEN 0 | |
57 | ||
58 | #define VHOST_DMA_IS_DONE(len) ((len) >= VHOST_DMA_DONE_LEN) | |
59 | ||
8570a6e7 AH |
60 | enum { |
61 | VHOST_NET_FEATURES = VHOST_FEATURES | | |
62 | (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) | | |
63 | (1ULL << VIRTIO_NET_F_MRG_RXBUF), | |
64 | }; | |
65 | ||
3a4d5c94 MT |
66 | enum { |
67 | VHOST_NET_VQ_RX = 0, | |
68 | VHOST_NET_VQ_TX = 1, | |
69 | VHOST_NET_VQ_MAX = 2, | |
70 | }; | |
71 | ||
fe729a57 | 72 | struct vhost_net_ubuf_ref { |
2839400f AH |
73 | struct kref kref; |
74 | wait_queue_head_t wait; | |
75 | struct vhost_virtqueue *vq; | |
76 | }; | |
77 | ||
3ab2e420 AH |
78 | struct vhost_net_virtqueue { |
79 | struct vhost_virtqueue vq; | |
81f95a55 MT |
80 | /* hdr is used to store the virtio header. |
81 | * Since each iovec has >= 1 byte length, we never need more than | |
82 | * header length entries to store the header. */ | |
83 | struct iovec hdr[sizeof(struct virtio_net_hdr_mrg_rxbuf)]; | |
84 | size_t vhost_hlen; | |
85 | size_t sock_hlen; | |
2839400f AH |
86 | /* vhost zerocopy support fields below: */ |
87 | /* last used idx for outstanding DMA zerocopy buffers */ | |
88 | int upend_idx; | |
89 | /* first used idx for DMA done zerocopy buffers */ | |
90 | int done_idx; | |
91 | /* an array of userspace buffers info */ | |
92 | struct ubuf_info *ubuf_info; | |
93 | /* Reference counting for outstanding ubufs. | |
94 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 95 | struct vhost_net_ubuf_ref *ubufs; |
3ab2e420 AH |
96 | }; |
97 | ||
3a4d5c94 MT |
98 | struct vhost_net { |
99 | struct vhost_dev dev; | |
3ab2e420 | 100 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 101 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
102 | /* Number of TX recently submitted. |
103 | * Protected by tx vq lock. */ | |
104 | unsigned tx_packets; | |
105 | /* Number of times zerocopy TX recently failed. | |
106 | * Protected by tx vq lock. */ | |
107 | unsigned tx_zcopy_err; | |
1280c27f MT |
108 | /* Flush in progress. Protected by tx vq lock. */ |
109 | bool tx_flush; | |
3a4d5c94 MT |
110 | }; |
111 | ||
fe729a57 | 112 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 113 | |
fe729a57 | 114 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 115 | { |
fe729a57 | 116 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
117 | } |
118 | ||
fe729a57 | 119 | static void vhost_net_zerocopy_done_signal(struct kref *kref) |
2839400f | 120 | { |
fe729a57 AH |
121 | struct vhost_net_ubuf_ref *ubufs; |
122 | ||
123 | ubufs = container_of(kref, struct vhost_net_ubuf_ref, kref); | |
2839400f AH |
124 | wake_up(&ubufs->wait); |
125 | } | |
126 | ||
fe729a57 AH |
127 | static struct vhost_net_ubuf_ref * |
128 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 129 | { |
fe729a57 | 130 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
131 | /* No zero copy backend? Nothing to count. */ |
132 | if (!zcopy) | |
133 | return NULL; | |
134 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
135 | if (!ubufs) | |
136 | return ERR_PTR(-ENOMEM); | |
137 | kref_init(&ubufs->kref); | |
138 | init_waitqueue_head(&ubufs->wait); | |
139 | ubufs->vq = vq; | |
140 | return ubufs; | |
141 | } | |
142 | ||
fe729a57 | 143 | static void vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 144 | { |
fe729a57 | 145 | kref_put(&ubufs->kref, vhost_net_zerocopy_done_signal); |
2839400f AH |
146 | } |
147 | ||
fe729a57 | 148 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 149 | { |
fe729a57 | 150 | kref_put(&ubufs->kref, vhost_net_zerocopy_done_signal); |
2839400f | 151 | wait_event(ubufs->wait, !atomic_read(&ubufs->kref.refcount)); |
c38e39c3 MT |
152 | } |
153 | ||
154 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
155 | { | |
156 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
157 | kfree(ubufs); |
158 | } | |
159 | ||
b1ad8496 AH |
160 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
161 | { | |
b1ad8496 AH |
162 | int i; |
163 | ||
288cfe78 MT |
164 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
165 | kfree(n->vqs[i].ubuf_info); | |
166 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
167 | } |
168 | } | |
169 | ||
0a1febf7 | 170 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
171 | { |
172 | bool zcopy; | |
173 | int i; | |
174 | ||
288cfe78 | 175 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 176 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
177 | if (!zcopy) |
178 | continue; | |
179 | n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * | |
180 | UIO_MAXIOV, GFP_KERNEL); | |
181 | if (!n->vqs[i].ubuf_info) | |
182 | goto err; | |
183 | } | |
184 | return 0; | |
185 | ||
186 | err: | |
288cfe78 | 187 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
188 | return -ENOMEM; |
189 | } | |
190 | ||
0a1febf7 | 191 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
192 | { |
193 | int i; | |
194 | ||
288cfe78 MT |
195 | vhost_net_clear_ubuf_info(n); |
196 | ||
2839400f AH |
197 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
198 | n->vqs[i].done_idx = 0; | |
199 | n->vqs[i].upend_idx = 0; | |
200 | n->vqs[i].ubufs = NULL; | |
81f95a55 MT |
201 | n->vqs[i].vhost_hlen = 0; |
202 | n->vqs[i].sock_hlen = 0; | |
2839400f AH |
203 | } |
204 | ||
205 | } | |
206 | ||
eaae8132 MT |
207 | static void vhost_net_tx_packet(struct vhost_net *net) |
208 | { | |
209 | ++net->tx_packets; | |
210 | if (net->tx_packets < 1024) | |
211 | return; | |
212 | net->tx_packets = 0; | |
213 | net->tx_zcopy_err = 0; | |
214 | } | |
215 | ||
216 | static void vhost_net_tx_err(struct vhost_net *net) | |
217 | { | |
218 | ++net->tx_zcopy_err; | |
219 | } | |
220 | ||
221 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
222 | { | |
1280c27f MT |
223 | /* TX flush waits for outstanding DMAs to be done. |
224 | * Don't start new DMAs. | |
225 | */ | |
226 | return !net->tx_flush && | |
227 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
228 | } |
229 | ||
bab632d6 MT |
230 | static bool vhost_sock_zcopy(struct socket *sock) |
231 | { | |
232 | return unlikely(experimental_zcopytx) && | |
233 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
234 | } | |
235 | ||
3a4d5c94 MT |
236 | /* Pop first len bytes from iovec. Return number of segments used. */ |
237 | static int move_iovec_hdr(struct iovec *from, struct iovec *to, | |
238 | size_t len, int iov_count) | |
239 | { | |
240 | int seg = 0; | |
241 | size_t size; | |
d47effe1 | 242 | |
3a4d5c94 MT |
243 | while (len && seg < iov_count) { |
244 | size = min(from->iov_len, len); | |
245 | to->iov_base = from->iov_base; | |
246 | to->iov_len = size; | |
247 | from->iov_len -= size; | |
248 | from->iov_base += size; | |
249 | len -= size; | |
250 | ++from; | |
251 | ++to; | |
252 | ++seg; | |
253 | } | |
254 | return seg; | |
255 | } | |
8dd014ad DS |
256 | /* Copy iovec entries for len bytes from iovec. */ |
257 | static void copy_iovec_hdr(const struct iovec *from, struct iovec *to, | |
258 | size_t len, int iovcount) | |
259 | { | |
260 | int seg = 0; | |
261 | size_t size; | |
d47effe1 | 262 | |
8dd014ad DS |
263 | while (len && seg < iovcount) { |
264 | size = min(from->iov_len, len); | |
265 | to->iov_base = from->iov_base; | |
266 | to->iov_len = size; | |
267 | len -= size; | |
268 | ++from; | |
269 | ++to; | |
270 | ++seg; | |
271 | } | |
272 | } | |
3a4d5c94 | 273 | |
b211616d MT |
274 | /* In case of DMA done not in order in lower device driver for some reason. |
275 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
276 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
277 | * guest used idx. | |
278 | */ | |
eaae8132 MT |
279 | static int vhost_zerocopy_signal_used(struct vhost_net *net, |
280 | struct vhost_virtqueue *vq) | |
b211616d | 281 | { |
2839400f AH |
282 | struct vhost_net_virtqueue *nvq = |
283 | container_of(vq, struct vhost_net_virtqueue, vq); | |
b211616d MT |
284 | int i; |
285 | int j = 0; | |
286 | ||
2839400f | 287 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
288 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
289 | vhost_net_tx_err(net); | |
b211616d MT |
290 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
291 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
292 | vhost_add_used_and_signal(vq->dev, vq, | |
293 | vq->heads[i].id, 0); | |
294 | ++j; | |
295 | } else | |
296 | break; | |
297 | } | |
298 | if (j) | |
2839400f | 299 | nvq->done_idx = i; |
b211616d MT |
300 | return j; |
301 | } | |
302 | ||
eaae8132 | 303 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 304 | { |
fe729a57 | 305 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 306 | struct vhost_virtqueue *vq = ubufs->vq; |
24eb21a1 MT |
307 | int cnt = atomic_read(&ubufs->kref.refcount); |
308 | ||
309 | /* | |
310 | * Trigger polling thread if guest stopped submitting new buffers: | |
311 | * in this case, the refcount after decrement will eventually reach 1 | |
312 | * so here it is 2. | |
313 | * We also trigger polling periodically after each 16 packets | |
314 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
315 | * less than 10% of times). | |
316 | */ | |
317 | if (cnt <= 2 || !(cnt % 16)) | |
318 | vhost_poll_queue(&vq->poll); | |
b211616d | 319 | /* set len to mark this desc buffers done DMA */ |
eaae8132 MT |
320 | vq->heads[ubuf->desc].len = success ? |
321 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
fe729a57 | 322 | vhost_net_ubuf_put(ubufs); |
b211616d MT |
323 | } |
324 | ||
3a4d5c94 MT |
325 | /* Expects to be always run from workqueue - which acts as |
326 | * read-size critical section for our kind of RCU. */ | |
327 | static void handle_tx(struct vhost_net *net) | |
328 | { | |
2839400f | 329 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 330 | struct vhost_virtqueue *vq = &nvq->vq; |
d5675bd2 MT |
331 | unsigned out, in, s; |
332 | int head; | |
3a4d5c94 MT |
333 | struct msghdr msg = { |
334 | .msg_name = NULL, | |
335 | .msg_namelen = 0, | |
336 | .msg_control = NULL, | |
337 | .msg_controllen = 0, | |
338 | .msg_iov = vq->iov, | |
339 | .msg_flags = MSG_DONTWAIT, | |
340 | }; | |
341 | size_t len, total_len = 0; | |
70181d51 | 342 | int err; |
3a4d5c94 | 343 | size_t hdr_size; |
28457ee6 | 344 | struct socket *sock; |
fe729a57 | 345 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 346 | bool zcopy, zcopy_used; |
28457ee6 | 347 | |
2e26af79 AH |
348 | mutex_lock(&vq->mutex); |
349 | sock = vq->private_data; | |
3a4d5c94 | 350 | if (!sock) |
2e26af79 | 351 | goto out; |
3a4d5c94 | 352 | |
8ea8cf89 | 353 | vhost_disable_notify(&net->dev, vq); |
3a4d5c94 | 354 | |
81f95a55 | 355 | hdr_size = nvq->vhost_hlen; |
2839400f | 356 | zcopy = nvq->ubufs; |
3a4d5c94 MT |
357 | |
358 | for (;;) { | |
bab632d6 MT |
359 | /* Release DMAs done buffers first */ |
360 | if (zcopy) | |
eaae8132 | 361 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 362 | |
3a4d5c94 MT |
363 | head = vhost_get_vq_desc(&net->dev, vq, vq->iov, |
364 | ARRAY_SIZE(vq->iov), | |
365 | &out, &in, | |
366 | NULL, NULL); | |
d5675bd2 | 367 | /* On error, stop handling until the next kick. */ |
7b3384fc | 368 | if (unlikely(head < 0)) |
d5675bd2 | 369 | break; |
3a4d5c94 MT |
370 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
371 | if (head == vq->num) { | |
9e380825 SM |
372 | int num_pends; |
373 | ||
9e380825 SM |
374 | /* If more outstanding DMAs, queue the work. |
375 | * Handle upend_idx wrap around | |
376 | */ | |
2839400f AH |
377 | num_pends = likely(nvq->upend_idx >= nvq->done_idx) ? |
378 | (nvq->upend_idx - nvq->done_idx) : | |
379 | (nvq->upend_idx + UIO_MAXIOV - | |
380 | nvq->done_idx); | |
70181d51 | 381 | if (unlikely(num_pends > VHOST_MAX_PEND)) |
bab632d6 | 382 | break; |
8ea8cf89 MT |
383 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
384 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
385 | continue; |
386 | } | |
387 | break; | |
388 | } | |
389 | if (in) { | |
390 | vq_err(vq, "Unexpected descriptor format for TX: " | |
391 | "out %d, int %d\n", out, in); | |
392 | break; | |
393 | } | |
394 | /* Skip header. TODO: support TSO. */ | |
81f95a55 | 395 | s = move_iovec_hdr(vq->iov, nvq->hdr, hdr_size, out); |
3a4d5c94 MT |
396 | msg.msg_iovlen = out; |
397 | len = iov_length(vq->iov, out); | |
398 | /* Sanity check */ | |
399 | if (!len) { | |
400 | vq_err(vq, "Unexpected header len for TX: " | |
401 | "%zd expected %zd\n", | |
81f95a55 | 402 | iov_length(nvq->hdr, s), hdr_size); |
3a4d5c94 MT |
403 | break; |
404 | } | |
cedb9bdc | 405 | zcopy_used = zcopy && (len >= VHOST_GOODCOPY_LEN || |
2839400f | 406 | nvq->upend_idx != nvq->done_idx); |
cedb9bdc | 407 | |
bab632d6 | 408 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 409 | if (zcopy_used) { |
2839400f | 410 | vq->heads[nvq->upend_idx].id = head; |
eaae8132 MT |
411 | if (!vhost_net_tx_select_zcopy(net) || |
412 | len < VHOST_GOODCOPY_LEN) { | |
bab632d6 | 413 | /* copy don't need to wait for DMA done */ |
2839400f | 414 | vq->heads[nvq->upend_idx].len = |
bab632d6 MT |
415 | VHOST_DMA_DONE_LEN; |
416 | msg.msg_control = NULL; | |
417 | msg.msg_controllen = 0; | |
418 | ubufs = NULL; | |
419 | } else { | |
46aa92d1 | 420 | struct ubuf_info *ubuf; |
2839400f | 421 | ubuf = nvq->ubuf_info + nvq->upend_idx; |
bab632d6 | 422 | |
2839400f | 423 | vq->heads[nvq->upend_idx].len = |
70e4cb9a | 424 | VHOST_DMA_IN_PROGRESS; |
bab632d6 | 425 | ubuf->callback = vhost_zerocopy_callback; |
2839400f AH |
426 | ubuf->ctx = nvq->ubufs; |
427 | ubuf->desc = nvq->upend_idx; | |
bab632d6 MT |
428 | msg.msg_control = ubuf; |
429 | msg.msg_controllen = sizeof(ubuf); | |
2839400f | 430 | ubufs = nvq->ubufs; |
bab632d6 MT |
431 | kref_get(&ubufs->kref); |
432 | } | |
2839400f | 433 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
4364d5f9 JW |
434 | } else |
435 | msg.msg_control = NULL; | |
3a4d5c94 MT |
436 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
437 | err = sock->ops->sendmsg(NULL, sock, &msg, len); | |
438 | if (unlikely(err < 0)) { | |
cedb9bdc | 439 | if (zcopy_used) { |
bab632d6 | 440 | if (ubufs) |
fe729a57 | 441 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
442 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
443 | % UIO_MAXIOV; | |
bab632d6 | 444 | } |
8dd014ad | 445 | vhost_discard_vq_desc(vq, 1); |
3a4d5c94 MT |
446 | break; |
447 | } | |
448 | if (err != len) | |
95c0ec6a MT |
449 | pr_debug("Truncated TX packet: " |
450 | " len %d != %zd\n", err, len); | |
cedb9bdc | 451 | if (!zcopy_used) |
bab632d6 | 452 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 453 | else |
eaae8132 | 454 | vhost_zerocopy_signal_used(net, vq); |
3a4d5c94 | 455 | total_len += len; |
eaae8132 | 456 | vhost_net_tx_packet(net); |
3a4d5c94 MT |
457 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
458 | vhost_poll_queue(&vq->poll); | |
459 | break; | |
460 | } | |
461 | } | |
2e26af79 | 462 | out: |
3a4d5c94 | 463 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
464 | } |
465 | ||
8dd014ad DS |
466 | static int peek_head_len(struct sock *sk) |
467 | { | |
468 | struct sk_buff *head; | |
469 | int len = 0; | |
783e3988 | 470 | unsigned long flags; |
8dd014ad | 471 | |
783e3988 | 472 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 473 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 474 | if (likely(head)) { |
8dd014ad | 475 | len = head->len; |
c53cff5e BG |
476 | if (vlan_tx_tag_present(head)) |
477 | len += VLAN_HLEN; | |
478 | } | |
479 | ||
783e3988 | 480 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
481 | return len; |
482 | } | |
483 | ||
484 | /* This is a multi-buffer version of vhost_get_desc, that works if | |
485 | * vq has read descriptors only. | |
486 | * @vq - the relevant virtqueue | |
487 | * @datalen - data length we'll be reading | |
488 | * @iovcount - returned count of io vectors we fill | |
489 | * @log - vhost log | |
490 | * @log_num - log offset | |
94249369 | 491 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
492 | * returns number of buffer heads allocated, negative on error |
493 | */ | |
494 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
495 | struct vring_used_elem *heads, | |
496 | int datalen, | |
497 | unsigned *iovcount, | |
498 | struct vhost_log *log, | |
94249369 JW |
499 | unsigned *log_num, |
500 | unsigned int quota) | |
8dd014ad DS |
501 | { |
502 | unsigned int out, in; | |
503 | int seg = 0; | |
504 | int headcount = 0; | |
505 | unsigned d; | |
506 | int r, nlogs = 0; | |
507 | ||
94249369 | 508 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 509 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
510 | r = -ENOBUFS; |
511 | goto err; | |
512 | } | |
513 | d = vhost_get_vq_desc(vq->dev, vq, vq->iov + seg, | |
514 | ARRAY_SIZE(vq->iov) - seg, &out, | |
515 | &in, log, log_num); | |
516 | if (d == vq->num) { | |
517 | r = 0; | |
518 | goto err; | |
519 | } | |
520 | if (unlikely(out || in <= 0)) { | |
521 | vq_err(vq, "unexpected descriptor format for RX: " | |
522 | "out %d, in %d\n", out, in); | |
523 | r = -EINVAL; | |
524 | goto err; | |
525 | } | |
526 | if (unlikely(log)) { | |
527 | nlogs += *log_num; | |
528 | log += *log_num; | |
529 | } | |
530 | heads[headcount].id = d; | |
531 | heads[headcount].len = iov_length(vq->iov + seg, in); | |
532 | datalen -= heads[headcount].len; | |
533 | ++headcount; | |
534 | seg += in; | |
535 | } | |
536 | heads[headcount - 1].len += datalen; | |
537 | *iovcount = seg; | |
538 | if (unlikely(log)) | |
539 | *log_num = nlogs; | |
540 | return headcount; | |
541 | err: | |
542 | vhost_discard_vq_desc(vq, headcount); | |
543 | return r; | |
544 | } | |
545 | ||
3a4d5c94 MT |
546 | /* Expects to be always run from workqueue - which acts as |
547 | * read-size critical section for our kind of RCU. */ | |
94249369 | 548 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 549 | { |
81f95a55 MT |
550 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
551 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
552 | unsigned uninitialized_var(in), log; |
553 | struct vhost_log *vq_log; | |
554 | struct msghdr msg = { | |
555 | .msg_name = NULL, | |
556 | .msg_namelen = 0, | |
557 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
558 | .msg_controllen = 0, | |
559 | .msg_iov = vq->iov, | |
560 | .msg_flags = MSG_DONTWAIT, | |
561 | }; | |
8dd014ad DS |
562 | struct virtio_net_hdr_mrg_rxbuf hdr = { |
563 | .hdr.flags = 0, | |
564 | .hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE | |
565 | }; | |
8dd014ad | 566 | size_t total_len = 0; |
910a578f MT |
567 | int err, mergeable; |
568 | s16 headcount; | |
8dd014ad DS |
569 | size_t vhost_hlen, sock_hlen; |
570 | size_t vhost_len, sock_len; | |
2e26af79 | 571 | struct socket *sock; |
8dd014ad | 572 | |
8dd014ad | 573 | mutex_lock(&vq->mutex); |
2e26af79 AH |
574 | sock = vq->private_data; |
575 | if (!sock) | |
576 | goto out; | |
8ea8cf89 | 577 | vhost_disable_notify(&net->dev, vq); |
2e26af79 | 578 | |
81f95a55 MT |
579 | vhost_hlen = nvq->vhost_hlen; |
580 | sock_hlen = nvq->sock_hlen; | |
8dd014ad DS |
581 | |
582 | vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ? | |
583 | vq->log : NULL; | |
cfbdab95 | 584 | mergeable = vhost_has_feature(&net->dev, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad DS |
585 | |
586 | while ((sock_len = peek_head_len(sock->sk))) { | |
587 | sock_len += sock_hlen; | |
588 | vhost_len = sock_len + vhost_hlen; | |
589 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, | |
94249369 JW |
590 | &in, vq_log, &log, |
591 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
592 | /* On error, stop handling until the next kick. */ |
593 | if (unlikely(headcount < 0)) | |
594 | break; | |
595 | /* OK, now we need to know about added descriptors. */ | |
596 | if (!headcount) { | |
8ea8cf89 | 597 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
598 | /* They have slipped one in as we were |
599 | * doing that: check again. */ | |
8ea8cf89 | 600 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
601 | continue; |
602 | } | |
603 | /* Nothing new? Wait for eventfd to tell us | |
604 | * they refilled. */ | |
605 | break; | |
606 | } | |
607 | /* We don't need to be notified again. */ | |
608 | if (unlikely((vhost_hlen))) | |
609 | /* Skip header. TODO: support TSO. */ | |
81f95a55 | 610 | move_iovec_hdr(vq->iov, nvq->hdr, vhost_hlen, in); |
8dd014ad DS |
611 | else |
612 | /* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF: | |
a290aec8 | 613 | * needed because recvmsg can modify msg_iov. */ |
81f95a55 | 614 | copy_iovec_hdr(vq->iov, nvq->hdr, sock_hlen, in); |
8dd014ad DS |
615 | msg.msg_iovlen = in; |
616 | err = sock->ops->recvmsg(NULL, sock, &msg, | |
617 | sock_len, MSG_DONTWAIT | MSG_TRUNC); | |
618 | /* Userspace might have consumed the packet meanwhile: | |
619 | * it's not supposed to do this usually, but might be hard | |
620 | * to prevent. Discard data we got (if any) and keep going. */ | |
621 | if (unlikely(err != sock_len)) { | |
622 | pr_debug("Discarded rx packet: " | |
623 | " len %d, expected %zd\n", err, sock_len); | |
624 | vhost_discard_vq_desc(vq, headcount); | |
625 | continue; | |
626 | } | |
627 | if (unlikely(vhost_hlen) && | |
81f95a55 | 628 | memcpy_toiovecend(nvq->hdr, (unsigned char *)&hdr, 0, |
8dd014ad DS |
629 | vhost_hlen)) { |
630 | vq_err(vq, "Unable to write vnet_hdr at addr %p\n", | |
631 | vq->iov->iov_base); | |
632 | break; | |
633 | } | |
634 | /* TODO: Should check and handle checksum. */ | |
cfbdab95 | 635 | if (likely(mergeable) && |
81f95a55 | 636 | memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount, |
8dd014ad DS |
637 | offsetof(typeof(hdr), num_buffers), |
638 | sizeof hdr.num_buffers)) { | |
639 | vq_err(vq, "Failed num_buffers write"); | |
640 | vhost_discard_vq_desc(vq, headcount); | |
641 | break; | |
642 | } | |
643 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
644 | headcount); | |
645 | if (unlikely(vq_log)) | |
646 | vhost_log_write(vq, vq_log, log, vhost_len); | |
647 | total_len += vhost_len; | |
648 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
649 | vhost_poll_queue(&vq->poll); | |
650 | break; | |
651 | } | |
652 | } | |
2e26af79 | 653 | out: |
8dd014ad | 654 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
655 | } |
656 | ||
c23f3445 | 657 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 658 | { |
c23f3445 TH |
659 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
660 | poll.work); | |
661 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
662 | ||
3a4d5c94 MT |
663 | handle_tx(net); |
664 | } | |
665 | ||
c23f3445 | 666 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 667 | { |
c23f3445 TH |
668 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
669 | poll.work); | |
670 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
671 | ||
3a4d5c94 MT |
672 | handle_rx(net); |
673 | } | |
674 | ||
c23f3445 | 675 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 676 | { |
c23f3445 TH |
677 | struct vhost_net *net = container_of(work, struct vhost_net, |
678 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
679 | handle_tx(net); |
680 | } | |
681 | ||
c23f3445 | 682 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 683 | { |
c23f3445 TH |
684 | struct vhost_net *net = container_of(work, struct vhost_net, |
685 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
686 | handle_rx(net); |
687 | } | |
688 | ||
689 | static int vhost_net_open(struct inode *inode, struct file *f) | |
690 | { | |
691 | struct vhost_net *n = kmalloc(sizeof *n, GFP_KERNEL); | |
c23f3445 | 692 | struct vhost_dev *dev; |
3ab2e420 | 693 | struct vhost_virtqueue **vqs; |
2839400f | 694 | int r, i; |
c23f3445 | 695 | |
3a4d5c94 MT |
696 | if (!n) |
697 | return -ENOMEM; | |
3ab2e420 AH |
698 | vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
699 | if (!vqs) { | |
700 | kfree(n); | |
701 | return -ENOMEM; | |
702 | } | |
c23f3445 TH |
703 | |
704 | dev = &n->dev; | |
3ab2e420 AH |
705 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
706 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
707 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
708 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
709 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
710 | n->vqs[i].ubufs = NULL; | |
711 | n->vqs[i].ubuf_info = NULL; | |
712 | n->vqs[i].upend_idx = 0; | |
713 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
714 | n->vqs[i].vhost_hlen = 0; |
715 | n->vqs[i].sock_hlen = 0; | |
2839400f | 716 | } |
3ab2e420 | 717 | r = vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 MT |
718 | if (r < 0) { |
719 | kfree(n); | |
3ab2e420 | 720 | kfree(vqs); |
3a4d5c94 MT |
721 | return r; |
722 | } | |
723 | ||
c23f3445 TH |
724 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
725 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); | |
3a4d5c94 MT |
726 | |
727 | f->private_data = n; | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
732 | static void vhost_net_disable_vq(struct vhost_net *n, | |
733 | struct vhost_virtqueue *vq) | |
734 | { | |
3ab2e420 AH |
735 | struct vhost_net_virtqueue *nvq = |
736 | container_of(vq, struct vhost_net_virtqueue, vq); | |
737 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
3a4d5c94 MT |
738 | if (!vq->private_data) |
739 | return; | |
70181d51 | 740 | vhost_poll_stop(poll); |
3a4d5c94 MT |
741 | } |
742 | ||
2b8b328b | 743 | static int vhost_net_enable_vq(struct vhost_net *n, |
3a4d5c94 MT |
744 | struct vhost_virtqueue *vq) |
745 | { | |
3ab2e420 AH |
746 | struct vhost_net_virtqueue *nvq = |
747 | container_of(vq, struct vhost_net_virtqueue, vq); | |
748 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
28457ee6 AB |
749 | struct socket *sock; |
750 | ||
22fa90c7 | 751 | sock = vq->private_data; |
3a4d5c94 | 752 | if (!sock) |
2b8b328b | 753 | return 0; |
2b8b328b | 754 | |
70181d51 | 755 | return vhost_poll_start(poll, sock->file); |
3a4d5c94 MT |
756 | } |
757 | ||
758 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, | |
759 | struct vhost_virtqueue *vq) | |
760 | { | |
761 | struct socket *sock; | |
762 | ||
763 | mutex_lock(&vq->mutex); | |
22fa90c7 | 764 | sock = vq->private_data; |
3a4d5c94 | 765 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 766 | vq->private_data = NULL; |
3a4d5c94 MT |
767 | mutex_unlock(&vq->mutex); |
768 | return sock; | |
769 | } | |
770 | ||
771 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
772 | struct socket **rx_sock) | |
773 | { | |
3ab2e420 AH |
774 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
775 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
776 | } |
777 | ||
778 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
779 | { | |
780 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 781 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
782 | } |
783 | ||
784 | static void vhost_net_flush(struct vhost_net *n) | |
785 | { | |
786 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
787 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 788 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 789 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 790 | n->tx_flush = true; |
3ab2e420 | 791 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 792 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 793 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 794 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 795 | n->tx_flush = false; |
2839400f | 796 | kref_init(&n->vqs[VHOST_NET_VQ_TX].ubufs->kref); |
3ab2e420 | 797 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 798 | } |
3a4d5c94 MT |
799 | } |
800 | ||
801 | static int vhost_net_release(struct inode *inode, struct file *f) | |
802 | { | |
803 | struct vhost_net *n = f->private_data; | |
804 | struct socket *tx_sock; | |
805 | struct socket *rx_sock; | |
806 | ||
807 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
808 | vhost_net_flush(n); | |
b211616d | 809 | vhost_dev_stop(&n->dev); |
ea5d4046 | 810 | vhost_dev_cleanup(&n->dev, false); |
81f95a55 | 811 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
812 | if (tx_sock) |
813 | fput(tx_sock->file); | |
814 | if (rx_sock) | |
815 | fput(rx_sock->file); | |
816 | /* We do an extra flush before freeing memory, | |
817 | * since jobs can re-queue themselves. */ | |
818 | vhost_net_flush(n); | |
3ab2e420 | 819 | kfree(n->dev.vqs); |
3a4d5c94 MT |
820 | kfree(n); |
821 | return 0; | |
822 | } | |
823 | ||
824 | static struct socket *get_raw_socket(int fd) | |
825 | { | |
826 | struct { | |
827 | struct sockaddr_ll sa; | |
828 | char buf[MAX_ADDR_LEN]; | |
829 | } uaddr; | |
830 | int uaddr_len = sizeof uaddr, r; | |
831 | struct socket *sock = sockfd_lookup(fd, &r); | |
d47effe1 | 832 | |
3a4d5c94 MT |
833 | if (!sock) |
834 | return ERR_PTR(-ENOTSOCK); | |
835 | ||
836 | /* Parameter checking */ | |
837 | if (sock->sk->sk_type != SOCK_RAW) { | |
838 | r = -ESOCKTNOSUPPORT; | |
839 | goto err; | |
840 | } | |
841 | ||
842 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
843 | &uaddr_len, 0); | |
844 | if (r) | |
845 | goto err; | |
846 | ||
847 | if (uaddr.sa.sll_family != AF_PACKET) { | |
848 | r = -EPFNOSUPPORT; | |
849 | goto err; | |
850 | } | |
851 | return sock; | |
852 | err: | |
853 | fput(sock->file); | |
854 | return ERR_PTR(r); | |
855 | } | |
856 | ||
501c774c | 857 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
858 | { |
859 | struct file *file = fget(fd); | |
860 | struct socket *sock; | |
d47effe1 | 861 | |
3a4d5c94 MT |
862 | if (!file) |
863 | return ERR_PTR(-EBADF); | |
864 | sock = tun_get_socket(file); | |
501c774c AB |
865 | if (!IS_ERR(sock)) |
866 | return sock; | |
867 | sock = macvtap_get_socket(file); | |
3a4d5c94 MT |
868 | if (IS_ERR(sock)) |
869 | fput(file); | |
870 | return sock; | |
871 | } | |
872 | ||
873 | static struct socket *get_socket(int fd) | |
874 | { | |
875 | struct socket *sock; | |
d47effe1 | 876 | |
3a4d5c94 MT |
877 | /* special case to disable backend */ |
878 | if (fd == -1) | |
879 | return NULL; | |
880 | sock = get_raw_socket(fd); | |
881 | if (!IS_ERR(sock)) | |
882 | return sock; | |
501c774c | 883 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
884 | if (!IS_ERR(sock)) |
885 | return sock; | |
886 | return ERR_PTR(-ENOTSOCK); | |
887 | } | |
888 | ||
889 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
890 | { | |
891 | struct socket *sock, *oldsock; | |
892 | struct vhost_virtqueue *vq; | |
2839400f | 893 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 894 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
895 | int r; |
896 | ||
897 | mutex_lock(&n->dev.mutex); | |
898 | r = vhost_dev_check_owner(&n->dev); | |
899 | if (r) | |
900 | goto err; | |
901 | ||
902 | if (index >= VHOST_NET_VQ_MAX) { | |
903 | r = -ENOBUFS; | |
904 | goto err; | |
905 | } | |
3ab2e420 | 906 | vq = &n->vqs[index].vq; |
2839400f | 907 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
908 | mutex_lock(&vq->mutex); |
909 | ||
910 | /* Verify that ring has been setup correctly. */ | |
911 | if (!vhost_vq_access_ok(vq)) { | |
912 | r = -EFAULT; | |
1dace8c8 | 913 | goto err_vq; |
3a4d5c94 MT |
914 | } |
915 | sock = get_socket(fd); | |
916 | if (IS_ERR(sock)) { | |
917 | r = PTR_ERR(sock); | |
1dace8c8 | 918 | goto err_vq; |
3a4d5c94 MT |
919 | } |
920 | ||
921 | /* start polling new socket */ | |
22fa90c7 | 922 | oldsock = vq->private_data; |
11fe8839 | 923 | if (sock != oldsock) { |
fe729a57 AH |
924 | ubufs = vhost_net_ubuf_alloc(vq, |
925 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
926 | if (IS_ERR(ubufs)) { |
927 | r = PTR_ERR(ubufs); | |
928 | goto err_ubufs; | |
929 | } | |
692a998b | 930 | |
d47effe1 | 931 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 932 | vq->private_data = sock; |
f59281da JW |
933 | r = vhost_init_used(vq); |
934 | if (r) | |
692a998b | 935 | goto err_used; |
2b8b328b JW |
936 | r = vhost_net_enable_vq(n, vq); |
937 | if (r) | |
938 | goto err_used; | |
692a998b | 939 | |
2839400f AH |
940 | oldubufs = nvq->ubufs; |
941 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
942 | |
943 | n->tx_packets = 0; | |
944 | n->tx_zcopy_err = 0; | |
1280c27f | 945 | n->tx_flush = false; |
dd1f4078 | 946 | } |
3a4d5c94 | 947 | |
1680e906 MT |
948 | mutex_unlock(&vq->mutex); |
949 | ||
c047e5f3 | 950 | if (oldubufs) { |
c38e39c3 | 951 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 952 | mutex_lock(&vq->mutex); |
eaae8132 | 953 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
954 | mutex_unlock(&vq->mutex); |
955 | } | |
bab632d6 | 956 | |
3a4d5c94 MT |
957 | if (oldsock) { |
958 | vhost_net_flush_vq(n, index); | |
959 | fput(oldsock->file); | |
960 | } | |
1dace8c8 | 961 | |
1680e906 MT |
962 | mutex_unlock(&n->dev.mutex); |
963 | return 0; | |
964 | ||
692a998b | 965 | err_used: |
22fa90c7 | 966 | vq->private_data = oldsock; |
692a998b JW |
967 | vhost_net_enable_vq(n, vq); |
968 | if (ubufs) | |
c38e39c3 | 969 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 MT |
970 | err_ubufs: |
971 | fput(sock->file); | |
1dace8c8 JD |
972 | err_vq: |
973 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
974 | err: |
975 | mutex_unlock(&n->dev.mutex); | |
976 | return r; | |
977 | } | |
978 | ||
979 | static long vhost_net_reset_owner(struct vhost_net *n) | |
980 | { | |
981 | struct socket *tx_sock = NULL; | |
982 | struct socket *rx_sock = NULL; | |
983 | long err; | |
150b9e51 | 984 | struct vhost_memory *memory; |
d47effe1 | 985 | |
3a4d5c94 MT |
986 | mutex_lock(&n->dev.mutex); |
987 | err = vhost_dev_check_owner(&n->dev); | |
988 | if (err) | |
989 | goto done; | |
150b9e51 MT |
990 | memory = vhost_dev_reset_owner_prepare(); |
991 | if (!memory) { | |
992 | err = -ENOMEM; | |
993 | goto done; | |
994 | } | |
3a4d5c94 MT |
995 | vhost_net_stop(n, &tx_sock, &rx_sock); |
996 | vhost_net_flush(n); | |
150b9e51 | 997 | vhost_dev_reset_owner(&n->dev, memory); |
81f95a55 | 998 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
999 | done: |
1000 | mutex_unlock(&n->dev.mutex); | |
1001 | if (tx_sock) | |
1002 | fput(tx_sock->file); | |
1003 | if (rx_sock) | |
1004 | fput(rx_sock->file); | |
1005 | return err; | |
1006 | } | |
1007 | ||
1008 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
1009 | { | |
8dd014ad | 1010 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1011 | int i; |
8dd014ad DS |
1012 | |
1013 | hdr_len = (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? | |
1014 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : | |
1015 | sizeof(struct virtio_net_hdr); | |
1016 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1017 | /* vhost provides vnet_hdr */ | |
1018 | vhost_hlen = hdr_len; | |
1019 | sock_hlen = 0; | |
1020 | } else { | |
1021 | /* socket provides vnet_hdr */ | |
1022 | vhost_hlen = 0; | |
1023 | sock_hlen = hdr_len; | |
1024 | } | |
3a4d5c94 MT |
1025 | mutex_lock(&n->dev.mutex); |
1026 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1027 | !vhost_log_access_ok(&n->dev)) { | |
1028 | mutex_unlock(&n->dev.mutex); | |
1029 | return -EFAULT; | |
1030 | } | |
1031 | n->dev.acked_features = features; | |
1032 | smp_wmb(); | |
1033 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { | |
3ab2e420 | 1034 | mutex_lock(&n->vqs[i].vq.mutex); |
81f95a55 MT |
1035 | n->vqs[i].vhost_hlen = vhost_hlen; |
1036 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1037 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 MT |
1038 | } |
1039 | vhost_net_flush(n); | |
1040 | mutex_unlock(&n->dev.mutex); | |
1041 | return 0; | |
1042 | } | |
1043 | ||
b1ad8496 AH |
1044 | static long vhost_net_set_owner(struct vhost_net *n) |
1045 | { | |
1046 | int r; | |
1047 | ||
1048 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1049 | if (vhost_dev_has_owner(&n->dev)) { |
1050 | r = -EBUSY; | |
1051 | goto out; | |
1052 | } | |
b1ad8496 AH |
1053 | r = vhost_net_set_ubuf_info(n); |
1054 | if (r) | |
1055 | goto out; | |
1056 | r = vhost_dev_set_owner(&n->dev); | |
1057 | if (r) | |
1058 | vhost_net_clear_ubuf_info(n); | |
1059 | vhost_net_flush(n); | |
1060 | out: | |
1061 | mutex_unlock(&n->dev.mutex); | |
1062 | return r; | |
1063 | } | |
1064 | ||
3a4d5c94 MT |
1065 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1066 | unsigned long arg) | |
1067 | { | |
1068 | struct vhost_net *n = f->private_data; | |
1069 | void __user *argp = (void __user *)arg; | |
1070 | u64 __user *featurep = argp; | |
1071 | struct vhost_vring_file backend; | |
1072 | u64 features; | |
1073 | int r; | |
d47effe1 | 1074 | |
3a4d5c94 MT |
1075 | switch (ioctl) { |
1076 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1077 | if (copy_from_user(&backend, argp, sizeof backend)) |
1078 | return -EFAULT; | |
3a4d5c94 MT |
1079 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1080 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1081 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1082 | if (copy_to_user(featurep, &features, sizeof features)) |
1083 | return -EFAULT; | |
1084 | return 0; | |
3a4d5c94 | 1085 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1086 | if (copy_from_user(&features, featurep, sizeof features)) |
1087 | return -EFAULT; | |
0dd05a3b | 1088 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1089 | return -EOPNOTSUPP; |
1090 | return vhost_net_set_features(n, features); | |
1091 | case VHOST_RESET_OWNER: | |
1092 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1093 | case VHOST_SET_OWNER: |
1094 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1095 | default: |
1096 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1097 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1098 | if (r == -ENOIOCTLCMD) | |
1099 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1100 | else | |
1101 | vhost_net_flush(n); | |
3a4d5c94 MT |
1102 | mutex_unlock(&n->dev.mutex); |
1103 | return r; | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | #ifdef CONFIG_COMPAT | |
1108 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1109 | unsigned long arg) | |
1110 | { | |
1111 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1112 | } | |
1113 | #endif | |
1114 | ||
373a83a6 | 1115 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1116 | .owner = THIS_MODULE, |
1117 | .release = vhost_net_release, | |
1118 | .unlocked_ioctl = vhost_net_ioctl, | |
1119 | #ifdef CONFIG_COMPAT | |
1120 | .compat_ioctl = vhost_net_compat_ioctl, | |
1121 | #endif | |
1122 | .open = vhost_net_open, | |
6038f373 | 1123 | .llseek = noop_llseek, |
3a4d5c94 MT |
1124 | }; |
1125 | ||
1126 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1127 | .minor = VHOST_NET_MINOR, |
1128 | .name = "vhost-net", | |
1129 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1130 | }; |
1131 | ||
a8d3782f | 1132 | static int vhost_net_init(void) |
3a4d5c94 | 1133 | { |
bab632d6 | 1134 | if (experimental_zcopytx) |
fe729a57 | 1135 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1136 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1137 | } |
1138 | module_init(vhost_net_init); | |
1139 | ||
a8d3782f | 1140 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1141 | { |
1142 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1143 | } |
1144 | module_exit(vhost_net_exit); | |
1145 | ||
1146 | MODULE_VERSION("0.0.1"); | |
1147 | MODULE_LICENSE("GPL v2"); | |
1148 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1149 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1150 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1151 | MODULE_ALIAS("devname:vhost-net"); |