]>
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> |
23cc5a99 | 20 | #include <linux/vmalloc.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 */ | |
bf995734 | 51 | #define VHOST_DMA_FAILED_LEN ((__force __virtio32)3) |
eaae8132 | 52 | /* Lower device DMA done */ |
bf995734 | 53 | #define VHOST_DMA_DONE_LEN ((__force __virtio32)2) |
eaae8132 | 54 | /* Lower device DMA in progress */ |
bf995734 | 55 | #define VHOST_DMA_IN_PROGRESS ((__force __virtio32)1) |
eaae8132 | 56 | /* Buffer unused */ |
bf995734 | 57 | #define VHOST_DMA_CLEAR_LEN ((__force __virtio32)0) |
eaae8132 | 58 | |
bf995734 | 59 | #define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force u32)VHOST_DMA_DONE_LEN) |
eaae8132 | 60 | |
8570a6e7 AH |
61 | enum { |
62 | VHOST_NET_FEATURES = VHOST_FEATURES | | |
63 | (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) | | |
41e3e421 MT |
64 | (1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
65 | (1ULL << VIRTIO_F_VERSION_1), | |
8570a6e7 AH |
66 | }; |
67 | ||
3a4d5c94 MT |
68 | enum { |
69 | VHOST_NET_VQ_RX = 0, | |
70 | VHOST_NET_VQ_TX = 1, | |
71 | VHOST_NET_VQ_MAX = 2, | |
72 | }; | |
73 | ||
fe729a57 | 74 | struct vhost_net_ubuf_ref { |
0ad8b480 MT |
75 | /* refcount follows semantics similar to kref: |
76 | * 0: object is released | |
77 | * 1: no outstanding ubufs | |
78 | * >1: outstanding ubufs | |
79 | */ | |
80 | atomic_t refcount; | |
2839400f AH |
81 | wait_queue_head_t wait; |
82 | struct vhost_virtqueue *vq; | |
83 | }; | |
84 | ||
3ab2e420 AH |
85 | struct vhost_net_virtqueue { |
86 | struct vhost_virtqueue vq; | |
81f95a55 MT |
87 | /* hdr is used to store the virtio header. |
88 | * Since each iovec has >= 1 byte length, we never need more than | |
89 | * header length entries to store the header. */ | |
90 | struct iovec hdr[sizeof(struct virtio_net_hdr_mrg_rxbuf)]; | |
91 | size_t vhost_hlen; | |
92 | size_t sock_hlen; | |
2839400f AH |
93 | /* vhost zerocopy support fields below: */ |
94 | /* last used idx for outstanding DMA zerocopy buffers */ | |
95 | int upend_idx; | |
96 | /* first used idx for DMA done zerocopy buffers */ | |
97 | int done_idx; | |
98 | /* an array of userspace buffers info */ | |
99 | struct ubuf_info *ubuf_info; | |
100 | /* Reference counting for outstanding ubufs. | |
101 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 102 | struct vhost_net_ubuf_ref *ubufs; |
3ab2e420 AH |
103 | }; |
104 | ||
3a4d5c94 MT |
105 | struct vhost_net { |
106 | struct vhost_dev dev; | |
3ab2e420 | 107 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 108 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
109 | /* Number of TX recently submitted. |
110 | * Protected by tx vq lock. */ | |
111 | unsigned tx_packets; | |
112 | /* Number of times zerocopy TX recently failed. | |
113 | * Protected by tx vq lock. */ | |
114 | unsigned tx_zcopy_err; | |
1280c27f MT |
115 | /* Flush in progress. Protected by tx vq lock. */ |
116 | bool tx_flush; | |
3a4d5c94 MT |
117 | }; |
118 | ||
fe729a57 | 119 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 120 | |
fe729a57 | 121 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 122 | { |
fe729a57 | 123 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
124 | } |
125 | ||
fe729a57 AH |
126 | static struct vhost_net_ubuf_ref * |
127 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 128 | { |
fe729a57 | 129 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
130 | /* No zero copy backend? Nothing to count. */ |
131 | if (!zcopy) | |
132 | return NULL; | |
133 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
134 | if (!ubufs) | |
135 | return ERR_PTR(-ENOMEM); | |
0ad8b480 | 136 | atomic_set(&ubufs->refcount, 1); |
2839400f AH |
137 | init_waitqueue_head(&ubufs->wait); |
138 | ubufs->vq = vq; | |
139 | return ubufs; | |
140 | } | |
141 | ||
0ad8b480 | 142 | static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 143 | { |
0ad8b480 MT |
144 | int r = atomic_sub_return(1, &ubufs->refcount); |
145 | if (unlikely(!r)) | |
146 | wake_up(&ubufs->wait); | |
147 | return r; | |
2839400f AH |
148 | } |
149 | ||
fe729a57 | 150 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 151 | { |
0ad8b480 MT |
152 | vhost_net_ubuf_put(ubufs); |
153 | wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); | |
c38e39c3 MT |
154 | } |
155 | ||
156 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
157 | { | |
158 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
159 | kfree(ubufs); |
160 | } | |
161 | ||
b1ad8496 AH |
162 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
163 | { | |
b1ad8496 AH |
164 | int i; |
165 | ||
288cfe78 MT |
166 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
167 | kfree(n->vqs[i].ubuf_info); | |
168 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
169 | } |
170 | } | |
171 | ||
0a1febf7 | 172 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
173 | { |
174 | bool zcopy; | |
175 | int i; | |
176 | ||
288cfe78 | 177 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 178 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
179 | if (!zcopy) |
180 | continue; | |
181 | n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * | |
182 | UIO_MAXIOV, GFP_KERNEL); | |
183 | if (!n->vqs[i].ubuf_info) | |
184 | goto err; | |
185 | } | |
186 | return 0; | |
187 | ||
188 | err: | |
288cfe78 | 189 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
190 | return -ENOMEM; |
191 | } | |
192 | ||
0a1febf7 | 193 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
194 | { |
195 | int i; | |
196 | ||
288cfe78 MT |
197 | vhost_net_clear_ubuf_info(n); |
198 | ||
2839400f AH |
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; | |
81f95a55 MT |
203 | n->vqs[i].vhost_hlen = 0; |
204 | n->vqs[i].sock_hlen = 0; | |
2839400f AH |
205 | } |
206 | ||
207 | } | |
208 | ||
eaae8132 MT |
209 | static void vhost_net_tx_packet(struct vhost_net *net) |
210 | { | |
211 | ++net->tx_packets; | |
212 | if (net->tx_packets < 1024) | |
213 | return; | |
214 | net->tx_packets = 0; | |
215 | net->tx_zcopy_err = 0; | |
216 | } | |
217 | ||
218 | static void vhost_net_tx_err(struct vhost_net *net) | |
219 | { | |
220 | ++net->tx_zcopy_err; | |
221 | } | |
222 | ||
223 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
224 | { | |
1280c27f MT |
225 | /* TX flush waits for outstanding DMAs to be done. |
226 | * Don't start new DMAs. | |
227 | */ | |
228 | return !net->tx_flush && | |
229 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
230 | } |
231 | ||
bab632d6 MT |
232 | static bool vhost_sock_zcopy(struct socket *sock) |
233 | { | |
234 | return unlikely(experimental_zcopytx) && | |
235 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
236 | } | |
237 | ||
3a4d5c94 MT |
238 | /* Pop first len bytes from iovec. Return number of segments used. */ |
239 | static int move_iovec_hdr(struct iovec *from, struct iovec *to, | |
240 | size_t len, int iov_count) | |
241 | { | |
242 | int seg = 0; | |
243 | size_t size; | |
d47effe1 | 244 | |
3a4d5c94 MT |
245 | while (len && seg < iov_count) { |
246 | size = min(from->iov_len, len); | |
247 | to->iov_base = from->iov_base; | |
248 | to->iov_len = size; | |
249 | from->iov_len -= size; | |
250 | from->iov_base += size; | |
251 | len -= size; | |
252 | ++from; | |
253 | ++to; | |
254 | ++seg; | |
255 | } | |
256 | return seg; | |
257 | } | |
8dd014ad DS |
258 | /* Copy iovec entries for len bytes from iovec. */ |
259 | static void copy_iovec_hdr(const struct iovec *from, struct iovec *to, | |
260 | size_t len, int iovcount) | |
261 | { | |
262 | int seg = 0; | |
263 | size_t size; | |
d47effe1 | 264 | |
8dd014ad DS |
265 | while (len && seg < iovcount) { |
266 | size = min(from->iov_len, len); | |
267 | to->iov_base = from->iov_base; | |
268 | to->iov_len = size; | |
269 | len -= size; | |
270 | ++from; | |
271 | ++to; | |
272 | ++seg; | |
273 | } | |
274 | } | |
3a4d5c94 | 275 | |
b211616d MT |
276 | /* In case of DMA done not in order in lower device driver for some reason. |
277 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
278 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
279 | * guest used idx. | |
280 | */ | |
094afe7d JW |
281 | static void vhost_zerocopy_signal_used(struct vhost_net *net, |
282 | struct vhost_virtqueue *vq) | |
b211616d | 283 | { |
2839400f AH |
284 | struct vhost_net_virtqueue *nvq = |
285 | container_of(vq, struct vhost_net_virtqueue, vq); | |
c92112ae | 286 | int i, add; |
b211616d MT |
287 | int j = 0; |
288 | ||
2839400f | 289 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
290 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
291 | vhost_net_tx_err(net); | |
b211616d MT |
292 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
293 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
b211616d MT |
294 | ++j; |
295 | } else | |
296 | break; | |
297 | } | |
c92112ae JW |
298 | while (j) { |
299 | add = min(UIO_MAXIOV - nvq->done_idx, j); | |
300 | vhost_add_used_and_signal_n(vq->dev, vq, | |
301 | &vq->heads[nvq->done_idx], add); | |
302 | nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; | |
303 | j -= add; | |
304 | } | |
b211616d MT |
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; |
0ad8b480 | 311 | int cnt; |
24eb21a1 | 312 | |
b0c057ca MT |
313 | rcu_read_lock_bh(); |
314 | ||
19c73b3e JW |
315 | /* set len to mark this desc buffers done DMA */ |
316 | vq->heads[ubuf->desc].len = success ? | |
317 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
0ad8b480 | 318 | cnt = vhost_net_ubuf_put(ubufs); |
19c73b3e | 319 | |
24eb21a1 MT |
320 | /* |
321 | * Trigger polling thread if guest stopped submitting new buffers: | |
0ad8b480 | 322 | * in this case, the refcount after decrement will eventually reach 1. |
24eb21a1 MT |
323 | * We also trigger polling periodically after each 16 packets |
324 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
325 | * less than 10% of times). | |
326 | */ | |
0ad8b480 | 327 | if (cnt <= 1 || !(cnt % 16)) |
24eb21a1 | 328 | vhost_poll_queue(&vq->poll); |
b0c057ca MT |
329 | |
330 | rcu_read_unlock_bh(); | |
b211616d MT |
331 | } |
332 | ||
3a4d5c94 MT |
333 | /* Expects to be always run from workqueue - which acts as |
334 | * read-size critical section for our kind of RCU. */ | |
335 | static void handle_tx(struct vhost_net *net) | |
336 | { | |
2839400f | 337 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 338 | struct vhost_virtqueue *vq = &nvq->vq; |
98a527aa | 339 | unsigned out, in; |
d5675bd2 | 340 | int head; |
3a4d5c94 MT |
341 | struct msghdr msg = { |
342 | .msg_name = NULL, | |
343 | .msg_namelen = 0, | |
344 | .msg_control = NULL, | |
345 | .msg_controllen = 0, | |
3a4d5c94 MT |
346 | .msg_flags = MSG_DONTWAIT, |
347 | }; | |
348 | size_t len, total_len = 0; | |
70181d51 | 349 | int err; |
3a4d5c94 | 350 | size_t hdr_size; |
28457ee6 | 351 | struct socket *sock; |
fe729a57 | 352 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 353 | bool zcopy, zcopy_used; |
28457ee6 | 354 | |
2e26af79 AH |
355 | mutex_lock(&vq->mutex); |
356 | sock = vq->private_data; | |
3a4d5c94 | 357 | if (!sock) |
2e26af79 | 358 | goto out; |
3a4d5c94 | 359 | |
8ea8cf89 | 360 | vhost_disable_notify(&net->dev, vq); |
3a4d5c94 | 361 | |
81f95a55 | 362 | hdr_size = nvq->vhost_hlen; |
2839400f | 363 | zcopy = nvq->ubufs; |
3a4d5c94 MT |
364 | |
365 | for (;;) { | |
bab632d6 MT |
366 | /* Release DMAs done buffers first */ |
367 | if (zcopy) | |
eaae8132 | 368 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 369 | |
f7c6be40 JW |
370 | /* If more outstanding DMAs, queue the work. |
371 | * Handle upend_idx wrap around | |
372 | */ | |
373 | if (unlikely((nvq->upend_idx + vq->num - VHOST_MAX_PEND) | |
374 | % UIO_MAXIOV == nvq->done_idx)) | |
375 | break; | |
376 | ||
47283bef | 377 | head = vhost_get_vq_desc(vq, vq->iov, |
3a4d5c94 MT |
378 | ARRAY_SIZE(vq->iov), |
379 | &out, &in, | |
380 | NULL, NULL); | |
d5675bd2 | 381 | /* On error, stop handling until the next kick. */ |
7b3384fc | 382 | if (unlikely(head < 0)) |
d5675bd2 | 383 | break; |
3a4d5c94 MT |
384 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
385 | if (head == vq->num) { | |
8ea8cf89 MT |
386 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
387 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
388 | continue; |
389 | } | |
390 | break; | |
391 | } | |
392 | if (in) { | |
393 | vq_err(vq, "Unexpected descriptor format for TX: " | |
394 | "out %d, int %d\n", out, in); | |
395 | break; | |
396 | } | |
397 | /* Skip header. TODO: support TSO. */ | |
3a4d5c94 | 398 | len = iov_length(vq->iov, out); |
c0371da6 | 399 | iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len); |
98a527aa | 400 | iov_iter_advance(&msg.msg_iter, hdr_size); |
3a4d5c94 | 401 | /* Sanity check */ |
98a527aa | 402 | if (!iov_iter_count(&msg.msg_iter)) { |
3a4d5c94 MT |
403 | vq_err(vq, "Unexpected header len for TX: " |
404 | "%zd expected %zd\n", | |
98a527aa | 405 | len, hdr_size); |
3a4d5c94 MT |
406 | break; |
407 | } | |
98a527aa | 408 | len = iov_iter_count(&msg.msg_iter); |
ce21a029 JW |
409 | |
410 | zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN | |
411 | && (nvq->upend_idx + 1) % UIO_MAXIOV != | |
412 | nvq->done_idx | |
413 | && vhost_net_tx_select_zcopy(net); | |
cedb9bdc | 414 | |
bab632d6 | 415 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 416 | if (zcopy_used) { |
ce21a029 JW |
417 | struct ubuf_info *ubuf; |
418 | ubuf = nvq->ubuf_info + nvq->upend_idx; | |
419 | ||
8b38694a | 420 | vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); |
ce21a029 JW |
421 | vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; |
422 | ubuf->callback = vhost_zerocopy_callback; | |
423 | ubuf->ctx = nvq->ubufs; | |
424 | ubuf->desc = nvq->upend_idx; | |
425 | msg.msg_control = ubuf; | |
426 | msg.msg_controllen = sizeof(ubuf); | |
427 | ubufs = nvq->ubufs; | |
0ad8b480 | 428 | atomic_inc(&ubufs->refcount); |
2839400f | 429 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
ce21a029 | 430 | } else { |
4364d5f9 | 431 | msg.msg_control = NULL; |
ce21a029 JW |
432 | ubufs = NULL; |
433 | } | |
3a4d5c94 MT |
434 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
435 | err = sock->ops->sendmsg(NULL, sock, &msg, len); | |
436 | if (unlikely(err < 0)) { | |
cedb9bdc | 437 | if (zcopy_used) { |
ce21a029 | 438 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
439 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
440 | % UIO_MAXIOV; | |
bab632d6 | 441 | } |
8dd014ad | 442 | vhost_discard_vq_desc(vq, 1); |
3a4d5c94 MT |
443 | break; |
444 | } | |
445 | if (err != len) | |
95c0ec6a MT |
446 | pr_debug("Truncated TX packet: " |
447 | " len %d != %zd\n", err, len); | |
cedb9bdc | 448 | if (!zcopy_used) |
bab632d6 | 449 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 450 | else |
eaae8132 | 451 | vhost_zerocopy_signal_used(net, vq); |
3a4d5c94 | 452 | total_len += len; |
eaae8132 | 453 | vhost_net_tx_packet(net); |
3a4d5c94 MT |
454 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
455 | vhost_poll_queue(&vq->poll); | |
456 | break; | |
457 | } | |
458 | } | |
2e26af79 | 459 | out: |
3a4d5c94 | 460 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
461 | } |
462 | ||
8dd014ad DS |
463 | static int peek_head_len(struct sock *sk) |
464 | { | |
465 | struct sk_buff *head; | |
466 | int len = 0; | |
783e3988 | 467 | unsigned long flags; |
8dd014ad | 468 | |
783e3988 | 469 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 470 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 471 | if (likely(head)) { |
8dd014ad | 472 | len = head->len; |
df8a39de | 473 | if (skb_vlan_tag_present(head)) |
c53cff5e BG |
474 | len += VLAN_HLEN; |
475 | } | |
476 | ||
783e3988 | 477 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
478 | return len; |
479 | } | |
480 | ||
481 | /* This is a multi-buffer version of vhost_get_desc, that works if | |
482 | * vq has read descriptors only. | |
483 | * @vq - the relevant virtqueue | |
484 | * @datalen - data length we'll be reading | |
485 | * @iovcount - returned count of io vectors we fill | |
486 | * @log - vhost log | |
487 | * @log_num - log offset | |
94249369 | 488 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
489 | * returns number of buffer heads allocated, negative on error |
490 | */ | |
491 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
492 | struct vring_used_elem *heads, | |
493 | int datalen, | |
494 | unsigned *iovcount, | |
495 | struct vhost_log *log, | |
94249369 JW |
496 | unsigned *log_num, |
497 | unsigned int quota) | |
8dd014ad DS |
498 | { |
499 | unsigned int out, in; | |
500 | int seg = 0; | |
501 | int headcount = 0; | |
502 | unsigned d; | |
503 | int r, nlogs = 0; | |
8b38694a MT |
504 | /* len is always initialized before use since we are always called with |
505 | * datalen > 0. | |
506 | */ | |
507 | u32 uninitialized_var(len); | |
8dd014ad | 508 | |
94249369 | 509 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 510 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
511 | r = -ENOBUFS; |
512 | goto err; | |
513 | } | |
47283bef | 514 | r = vhost_get_vq_desc(vq, vq->iov + seg, |
8dd014ad DS |
515 | ARRAY_SIZE(vq->iov) - seg, &out, |
516 | &in, log, log_num); | |
a39ee449 MT |
517 | if (unlikely(r < 0)) |
518 | goto err; | |
519 | ||
520 | d = r; | |
8dd014ad DS |
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 | } | |
8b38694a MT |
535 | heads[headcount].id = cpu_to_vhost32(vq, d); |
536 | len = iov_length(vq->iov + seg, in); | |
537 | heads[headcount].len = cpu_to_vhost32(vq, len); | |
538 | datalen -= len; | |
8dd014ad DS |
539 | ++headcount; |
540 | seg += in; | |
541 | } | |
99975cc6 | 542 | heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); |
8dd014ad DS |
543 | *iovcount = seg; |
544 | if (unlikely(log)) | |
545 | *log_num = nlogs; | |
d8316f39 MT |
546 | |
547 | /* Detect overrun */ | |
548 | if (unlikely(datalen > 0)) { | |
549 | r = UIO_MAXIOV + 1; | |
550 | goto err; | |
551 | } | |
8dd014ad DS |
552 | return headcount; |
553 | err: | |
554 | vhost_discard_vq_desc(vq, headcount); | |
555 | return r; | |
556 | } | |
557 | ||
3a4d5c94 MT |
558 | /* Expects to be always run from workqueue - which acts as |
559 | * read-size critical section for our kind of RCU. */ | |
94249369 | 560 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 561 | { |
81f95a55 MT |
562 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
563 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
564 | unsigned uninitialized_var(in), log; |
565 | struct vhost_log *vq_log; | |
566 | struct msghdr msg = { | |
567 | .msg_name = NULL, | |
568 | .msg_namelen = 0, | |
569 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
570 | .msg_controllen = 0, | |
8dd014ad DS |
571 | .msg_flags = MSG_DONTWAIT, |
572 | }; | |
8dd014ad DS |
573 | struct virtio_net_hdr_mrg_rxbuf hdr = { |
574 | .hdr.flags = 0, | |
575 | .hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE | |
576 | }; | |
8dd014ad | 577 | size_t total_len = 0; |
910a578f MT |
578 | int err, mergeable; |
579 | s16 headcount; | |
8dd014ad DS |
580 | size_t vhost_hlen, sock_hlen; |
581 | size_t vhost_len, sock_len; | |
2e26af79 | 582 | struct socket *sock; |
8dd014ad | 583 | |
8dd014ad | 584 | mutex_lock(&vq->mutex); |
2e26af79 AH |
585 | sock = vq->private_data; |
586 | if (!sock) | |
587 | goto out; | |
8ea8cf89 | 588 | vhost_disable_notify(&net->dev, vq); |
2e26af79 | 589 | |
81f95a55 MT |
590 | vhost_hlen = nvq->vhost_hlen; |
591 | sock_hlen = nvq->sock_hlen; | |
8dd014ad | 592 | |
ea16c514 | 593 | vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ? |
8dd014ad | 594 | vq->log : NULL; |
ea16c514 | 595 | mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad DS |
596 | |
597 | while ((sock_len = peek_head_len(sock->sk))) { | |
598 | sock_len += sock_hlen; | |
599 | vhost_len = sock_len + vhost_hlen; | |
600 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, | |
94249369 JW |
601 | &in, vq_log, &log, |
602 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
603 | /* On error, stop handling until the next kick. */ |
604 | if (unlikely(headcount < 0)) | |
605 | break; | |
d8316f39 MT |
606 | /* On overrun, truncate and discard */ |
607 | if (unlikely(headcount > UIO_MAXIOV)) { | |
c0371da6 | 608 | iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); |
d8316f39 MT |
609 | err = sock->ops->recvmsg(NULL, sock, &msg, |
610 | 1, MSG_DONTWAIT | MSG_TRUNC); | |
611 | pr_debug("Discarded rx packet: len %zd\n", sock_len); | |
612 | continue; | |
613 | } | |
8dd014ad DS |
614 | /* OK, now we need to know about added descriptors. */ |
615 | if (!headcount) { | |
8ea8cf89 | 616 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
617 | /* They have slipped one in as we were |
618 | * doing that: check again. */ | |
8ea8cf89 | 619 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
620 | continue; |
621 | } | |
622 | /* Nothing new? Wait for eventfd to tell us | |
623 | * they refilled. */ | |
624 | break; | |
625 | } | |
626 | /* We don't need to be notified again. */ | |
627 | if (unlikely((vhost_hlen))) | |
628 | /* Skip header. TODO: support TSO. */ | |
81f95a55 | 629 | move_iovec_hdr(vq->iov, nvq->hdr, vhost_hlen, in); |
8dd014ad DS |
630 | else |
631 | /* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF: | |
a290aec8 | 632 | * needed because recvmsg can modify msg_iov. */ |
81f95a55 | 633 | copy_iovec_hdr(vq->iov, nvq->hdr, sock_hlen, in); |
c0371da6 | 634 | iov_iter_init(&msg.msg_iter, READ, vq->iov, in, sock_len); |
8dd014ad DS |
635 | err = sock->ops->recvmsg(NULL, sock, &msg, |
636 | sock_len, MSG_DONTWAIT | MSG_TRUNC); | |
637 | /* Userspace might have consumed the packet meanwhile: | |
638 | * it's not supposed to do this usually, but might be hard | |
639 | * to prevent. Discard data we got (if any) and keep going. */ | |
640 | if (unlikely(err != sock_len)) { | |
641 | pr_debug("Discarded rx packet: " | |
642 | " len %d, expected %zd\n", err, sock_len); | |
643 | vhost_discard_vq_desc(vq, headcount); | |
644 | continue; | |
645 | } | |
646 | if (unlikely(vhost_hlen) && | |
81f95a55 | 647 | memcpy_toiovecend(nvq->hdr, (unsigned char *)&hdr, 0, |
8dd014ad DS |
648 | vhost_hlen)) { |
649 | vq_err(vq, "Unable to write vnet_hdr at addr %p\n", | |
650 | vq->iov->iov_base); | |
651 | break; | |
652 | } | |
653 | /* TODO: Should check and handle checksum. */ | |
cfbdab95 | 654 | if (likely(mergeable) && |
81f95a55 | 655 | memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount, |
8dd014ad DS |
656 | offsetof(typeof(hdr), num_buffers), |
657 | sizeof hdr.num_buffers)) { | |
658 | vq_err(vq, "Failed num_buffers write"); | |
659 | vhost_discard_vq_desc(vq, headcount); | |
660 | break; | |
661 | } | |
662 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
663 | headcount); | |
664 | if (unlikely(vq_log)) | |
665 | vhost_log_write(vq, vq_log, log, vhost_len); | |
666 | total_len += vhost_len; | |
667 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
668 | vhost_poll_queue(&vq->poll); | |
669 | break; | |
670 | } | |
671 | } | |
2e26af79 | 672 | out: |
8dd014ad | 673 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
674 | } |
675 | ||
c23f3445 | 676 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 677 | { |
c23f3445 TH |
678 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
679 | poll.work); | |
680 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
681 | ||
3a4d5c94 MT |
682 | handle_tx(net); |
683 | } | |
684 | ||
c23f3445 | 685 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 686 | { |
c23f3445 TH |
687 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
688 | poll.work); | |
689 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
690 | ||
3a4d5c94 MT |
691 | handle_rx(net); |
692 | } | |
693 | ||
c23f3445 | 694 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 695 | { |
c23f3445 TH |
696 | struct vhost_net *net = container_of(work, struct vhost_net, |
697 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
698 | handle_tx(net); |
699 | } | |
700 | ||
c23f3445 | 701 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 702 | { |
c23f3445 TH |
703 | struct vhost_net *net = container_of(work, struct vhost_net, |
704 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
705 | handle_rx(net); |
706 | } | |
707 | ||
708 | static int vhost_net_open(struct inode *inode, struct file *f) | |
709 | { | |
23cc5a99 | 710 | struct vhost_net *n; |
c23f3445 | 711 | struct vhost_dev *dev; |
3ab2e420 | 712 | struct vhost_virtqueue **vqs; |
59566b6e | 713 | int i; |
c23f3445 | 714 | |
23cc5a99 MT |
715 | n = kmalloc(sizeof *n, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
716 | if (!n) { | |
717 | n = vmalloc(sizeof *n); | |
718 | if (!n) | |
719 | return -ENOMEM; | |
720 | } | |
3ab2e420 AH |
721 | vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
722 | if (!vqs) { | |
d04257b0 | 723 | kvfree(n); |
3ab2e420 AH |
724 | return -ENOMEM; |
725 | } | |
c23f3445 TH |
726 | |
727 | dev = &n->dev; | |
3ab2e420 AH |
728 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
729 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
730 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
731 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
732 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
733 | n->vqs[i].ubufs = NULL; | |
734 | n->vqs[i].ubuf_info = NULL; | |
735 | n->vqs[i].upend_idx = 0; | |
736 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
737 | n->vqs[i].vhost_hlen = 0; |
738 | n->vqs[i].sock_hlen = 0; | |
2839400f | 739 | } |
59566b6e | 740 | vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 | 741 | |
c23f3445 TH |
742 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
743 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); | |
3a4d5c94 MT |
744 | |
745 | f->private_data = n; | |
746 | ||
747 | return 0; | |
748 | } | |
749 | ||
750 | static void vhost_net_disable_vq(struct vhost_net *n, | |
751 | struct vhost_virtqueue *vq) | |
752 | { | |
3ab2e420 AH |
753 | struct vhost_net_virtqueue *nvq = |
754 | container_of(vq, struct vhost_net_virtqueue, vq); | |
755 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
3a4d5c94 MT |
756 | if (!vq->private_data) |
757 | return; | |
70181d51 | 758 | vhost_poll_stop(poll); |
3a4d5c94 MT |
759 | } |
760 | ||
2b8b328b | 761 | static int vhost_net_enable_vq(struct vhost_net *n, |
3a4d5c94 MT |
762 | struct vhost_virtqueue *vq) |
763 | { | |
3ab2e420 AH |
764 | struct vhost_net_virtqueue *nvq = |
765 | container_of(vq, struct vhost_net_virtqueue, vq); | |
766 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
28457ee6 AB |
767 | struct socket *sock; |
768 | ||
22fa90c7 | 769 | sock = vq->private_data; |
3a4d5c94 | 770 | if (!sock) |
2b8b328b | 771 | return 0; |
2b8b328b | 772 | |
70181d51 | 773 | return vhost_poll_start(poll, sock->file); |
3a4d5c94 MT |
774 | } |
775 | ||
776 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, | |
777 | struct vhost_virtqueue *vq) | |
778 | { | |
779 | struct socket *sock; | |
780 | ||
781 | mutex_lock(&vq->mutex); | |
22fa90c7 | 782 | sock = vq->private_data; |
3a4d5c94 | 783 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 784 | vq->private_data = NULL; |
3a4d5c94 MT |
785 | mutex_unlock(&vq->mutex); |
786 | return sock; | |
787 | } | |
788 | ||
789 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
790 | struct socket **rx_sock) | |
791 | { | |
3ab2e420 AH |
792 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
793 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
794 | } |
795 | ||
796 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
797 | { | |
798 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 799 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
800 | } |
801 | ||
802 | static void vhost_net_flush(struct vhost_net *n) | |
803 | { | |
804 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
805 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 806 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 807 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 808 | n->tx_flush = true; |
3ab2e420 | 809 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 810 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 811 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 812 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 813 | n->tx_flush = false; |
0ad8b480 | 814 | atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); |
3ab2e420 | 815 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 816 | } |
3a4d5c94 MT |
817 | } |
818 | ||
819 | static int vhost_net_release(struct inode *inode, struct file *f) | |
820 | { | |
821 | struct vhost_net *n = f->private_data; | |
822 | struct socket *tx_sock; | |
823 | struct socket *rx_sock; | |
824 | ||
825 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
826 | vhost_net_flush(n); | |
b211616d | 827 | vhost_dev_stop(&n->dev); |
ea5d4046 | 828 | vhost_dev_cleanup(&n->dev, false); |
81f95a55 | 829 | vhost_net_vq_reset(n); |
3a4d5c94 | 830 | if (tx_sock) |
09aaacf0 | 831 | sockfd_put(tx_sock); |
3a4d5c94 | 832 | if (rx_sock) |
09aaacf0 | 833 | sockfd_put(rx_sock); |
b0c057ca MT |
834 | /* Make sure no callbacks are outstanding */ |
835 | synchronize_rcu_bh(); | |
3a4d5c94 MT |
836 | /* We do an extra flush before freeing memory, |
837 | * since jobs can re-queue themselves. */ | |
838 | vhost_net_flush(n); | |
3ab2e420 | 839 | kfree(n->dev.vqs); |
d04257b0 | 840 | kvfree(n); |
3a4d5c94 MT |
841 | return 0; |
842 | } | |
843 | ||
844 | static struct socket *get_raw_socket(int fd) | |
845 | { | |
846 | struct { | |
847 | struct sockaddr_ll sa; | |
848 | char buf[MAX_ADDR_LEN]; | |
849 | } uaddr; | |
850 | int uaddr_len = sizeof uaddr, r; | |
851 | struct socket *sock = sockfd_lookup(fd, &r); | |
d47effe1 | 852 | |
3a4d5c94 MT |
853 | if (!sock) |
854 | return ERR_PTR(-ENOTSOCK); | |
855 | ||
856 | /* Parameter checking */ | |
857 | if (sock->sk->sk_type != SOCK_RAW) { | |
858 | r = -ESOCKTNOSUPPORT; | |
859 | goto err; | |
860 | } | |
861 | ||
862 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
863 | &uaddr_len, 0); | |
864 | if (r) | |
865 | goto err; | |
866 | ||
867 | if (uaddr.sa.sll_family != AF_PACKET) { | |
868 | r = -EPFNOSUPPORT; | |
869 | goto err; | |
870 | } | |
871 | return sock; | |
872 | err: | |
09aaacf0 | 873 | sockfd_put(sock); |
3a4d5c94 MT |
874 | return ERR_PTR(r); |
875 | } | |
876 | ||
501c774c | 877 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
878 | { |
879 | struct file *file = fget(fd); | |
880 | struct socket *sock; | |
d47effe1 | 881 | |
3a4d5c94 MT |
882 | if (!file) |
883 | return ERR_PTR(-EBADF); | |
884 | sock = tun_get_socket(file); | |
501c774c AB |
885 | if (!IS_ERR(sock)) |
886 | return sock; | |
887 | sock = macvtap_get_socket(file); | |
3a4d5c94 MT |
888 | if (IS_ERR(sock)) |
889 | fput(file); | |
890 | return sock; | |
891 | } | |
892 | ||
893 | static struct socket *get_socket(int fd) | |
894 | { | |
895 | struct socket *sock; | |
d47effe1 | 896 | |
3a4d5c94 MT |
897 | /* special case to disable backend */ |
898 | if (fd == -1) | |
899 | return NULL; | |
900 | sock = get_raw_socket(fd); | |
901 | if (!IS_ERR(sock)) | |
902 | return sock; | |
501c774c | 903 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
904 | if (!IS_ERR(sock)) |
905 | return sock; | |
906 | return ERR_PTR(-ENOTSOCK); | |
907 | } | |
908 | ||
909 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
910 | { | |
911 | struct socket *sock, *oldsock; | |
912 | struct vhost_virtqueue *vq; | |
2839400f | 913 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 914 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
915 | int r; |
916 | ||
917 | mutex_lock(&n->dev.mutex); | |
918 | r = vhost_dev_check_owner(&n->dev); | |
919 | if (r) | |
920 | goto err; | |
921 | ||
922 | if (index >= VHOST_NET_VQ_MAX) { | |
923 | r = -ENOBUFS; | |
924 | goto err; | |
925 | } | |
3ab2e420 | 926 | vq = &n->vqs[index].vq; |
2839400f | 927 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
928 | mutex_lock(&vq->mutex); |
929 | ||
930 | /* Verify that ring has been setup correctly. */ | |
931 | if (!vhost_vq_access_ok(vq)) { | |
932 | r = -EFAULT; | |
1dace8c8 | 933 | goto err_vq; |
3a4d5c94 MT |
934 | } |
935 | sock = get_socket(fd); | |
936 | if (IS_ERR(sock)) { | |
937 | r = PTR_ERR(sock); | |
1dace8c8 | 938 | goto err_vq; |
3a4d5c94 MT |
939 | } |
940 | ||
941 | /* start polling new socket */ | |
22fa90c7 | 942 | oldsock = vq->private_data; |
11fe8839 | 943 | if (sock != oldsock) { |
fe729a57 AH |
944 | ubufs = vhost_net_ubuf_alloc(vq, |
945 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
946 | if (IS_ERR(ubufs)) { |
947 | r = PTR_ERR(ubufs); | |
948 | goto err_ubufs; | |
949 | } | |
692a998b | 950 | |
d47effe1 | 951 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 952 | vq->private_data = sock; |
f59281da JW |
953 | r = vhost_init_used(vq); |
954 | if (r) | |
692a998b | 955 | goto err_used; |
2b8b328b JW |
956 | r = vhost_net_enable_vq(n, vq); |
957 | if (r) | |
958 | goto err_used; | |
692a998b | 959 | |
2839400f AH |
960 | oldubufs = nvq->ubufs; |
961 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
962 | |
963 | n->tx_packets = 0; | |
964 | n->tx_zcopy_err = 0; | |
1280c27f | 965 | n->tx_flush = false; |
dd1f4078 | 966 | } |
3a4d5c94 | 967 | |
1680e906 MT |
968 | mutex_unlock(&vq->mutex); |
969 | ||
c047e5f3 | 970 | if (oldubufs) { |
c38e39c3 | 971 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 972 | mutex_lock(&vq->mutex); |
eaae8132 | 973 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
974 | mutex_unlock(&vq->mutex); |
975 | } | |
bab632d6 | 976 | |
3a4d5c94 MT |
977 | if (oldsock) { |
978 | vhost_net_flush_vq(n, index); | |
09aaacf0 | 979 | sockfd_put(oldsock); |
3a4d5c94 | 980 | } |
1dace8c8 | 981 | |
1680e906 MT |
982 | mutex_unlock(&n->dev.mutex); |
983 | return 0; | |
984 | ||
692a998b | 985 | err_used: |
22fa90c7 | 986 | vq->private_data = oldsock; |
692a998b JW |
987 | vhost_net_enable_vq(n, vq); |
988 | if (ubufs) | |
c38e39c3 | 989 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 | 990 | err_ubufs: |
09aaacf0 | 991 | sockfd_put(sock); |
1dace8c8 JD |
992 | err_vq: |
993 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
994 | err: |
995 | mutex_unlock(&n->dev.mutex); | |
996 | return r; | |
997 | } | |
998 | ||
999 | static long vhost_net_reset_owner(struct vhost_net *n) | |
1000 | { | |
1001 | struct socket *tx_sock = NULL; | |
1002 | struct socket *rx_sock = NULL; | |
1003 | long err; | |
150b9e51 | 1004 | struct vhost_memory *memory; |
d47effe1 | 1005 | |
3a4d5c94 MT |
1006 | mutex_lock(&n->dev.mutex); |
1007 | err = vhost_dev_check_owner(&n->dev); | |
1008 | if (err) | |
1009 | goto done; | |
150b9e51 MT |
1010 | memory = vhost_dev_reset_owner_prepare(); |
1011 | if (!memory) { | |
1012 | err = -ENOMEM; | |
1013 | goto done; | |
1014 | } | |
3a4d5c94 MT |
1015 | vhost_net_stop(n, &tx_sock, &rx_sock); |
1016 | vhost_net_flush(n); | |
150b9e51 | 1017 | vhost_dev_reset_owner(&n->dev, memory); |
81f95a55 | 1018 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
1019 | done: |
1020 | mutex_unlock(&n->dev.mutex); | |
1021 | if (tx_sock) | |
09aaacf0 | 1022 | sockfd_put(tx_sock); |
3a4d5c94 | 1023 | if (rx_sock) |
09aaacf0 | 1024 | sockfd_put(rx_sock); |
3a4d5c94 MT |
1025 | return err; |
1026 | } | |
1027 | ||
1028 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
1029 | { | |
8dd014ad | 1030 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1031 | int i; |
8dd014ad | 1032 | |
e4fca7d6 MT |
1033 | hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
1034 | (1ULL << VIRTIO_F_VERSION_1))) ? | |
8dd014ad DS |
1035 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
1036 | sizeof(struct virtio_net_hdr); | |
1037 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1038 | /* vhost provides vnet_hdr */ | |
1039 | vhost_hlen = hdr_len; | |
1040 | sock_hlen = 0; | |
1041 | } else { | |
1042 | /* socket provides vnet_hdr */ | |
1043 | vhost_hlen = 0; | |
1044 | sock_hlen = hdr_len; | |
1045 | } | |
3a4d5c94 MT |
1046 | mutex_lock(&n->dev.mutex); |
1047 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1048 | !vhost_log_access_ok(&n->dev)) { | |
1049 | mutex_unlock(&n->dev.mutex); | |
1050 | return -EFAULT; | |
1051 | } | |
3a4d5c94 | 1052 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
3ab2e420 | 1053 | mutex_lock(&n->vqs[i].vq.mutex); |
ea16c514 | 1054 | n->vqs[i].vq.acked_features = features; |
81f95a55 MT |
1055 | n->vqs[i].vhost_hlen = vhost_hlen; |
1056 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1057 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 | 1058 | } |
3a4d5c94 MT |
1059 | mutex_unlock(&n->dev.mutex); |
1060 | return 0; | |
1061 | } | |
1062 | ||
b1ad8496 AH |
1063 | static long vhost_net_set_owner(struct vhost_net *n) |
1064 | { | |
1065 | int r; | |
1066 | ||
1067 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1068 | if (vhost_dev_has_owner(&n->dev)) { |
1069 | r = -EBUSY; | |
1070 | goto out; | |
1071 | } | |
b1ad8496 AH |
1072 | r = vhost_net_set_ubuf_info(n); |
1073 | if (r) | |
1074 | goto out; | |
1075 | r = vhost_dev_set_owner(&n->dev); | |
1076 | if (r) | |
1077 | vhost_net_clear_ubuf_info(n); | |
1078 | vhost_net_flush(n); | |
1079 | out: | |
1080 | mutex_unlock(&n->dev.mutex); | |
1081 | return r; | |
1082 | } | |
1083 | ||
3a4d5c94 MT |
1084 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1085 | unsigned long arg) | |
1086 | { | |
1087 | struct vhost_net *n = f->private_data; | |
1088 | void __user *argp = (void __user *)arg; | |
1089 | u64 __user *featurep = argp; | |
1090 | struct vhost_vring_file backend; | |
1091 | u64 features; | |
1092 | int r; | |
d47effe1 | 1093 | |
3a4d5c94 MT |
1094 | switch (ioctl) { |
1095 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1096 | if (copy_from_user(&backend, argp, sizeof backend)) |
1097 | return -EFAULT; | |
3a4d5c94 MT |
1098 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1099 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1100 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1101 | if (copy_to_user(featurep, &features, sizeof features)) |
1102 | return -EFAULT; | |
1103 | return 0; | |
3a4d5c94 | 1104 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1105 | if (copy_from_user(&features, featurep, sizeof features)) |
1106 | return -EFAULT; | |
0dd05a3b | 1107 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1108 | return -EOPNOTSUPP; |
1109 | return vhost_net_set_features(n, features); | |
1110 | case VHOST_RESET_OWNER: | |
1111 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1112 | case VHOST_SET_OWNER: |
1113 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1114 | default: |
1115 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1116 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1117 | if (r == -ENOIOCTLCMD) | |
1118 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1119 | else | |
1120 | vhost_net_flush(n); | |
3a4d5c94 MT |
1121 | mutex_unlock(&n->dev.mutex); |
1122 | return r; | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | #ifdef CONFIG_COMPAT | |
1127 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1128 | unsigned long arg) | |
1129 | { | |
1130 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1131 | } | |
1132 | #endif | |
1133 | ||
373a83a6 | 1134 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1135 | .owner = THIS_MODULE, |
1136 | .release = vhost_net_release, | |
1137 | .unlocked_ioctl = vhost_net_ioctl, | |
1138 | #ifdef CONFIG_COMPAT | |
1139 | .compat_ioctl = vhost_net_compat_ioctl, | |
1140 | #endif | |
1141 | .open = vhost_net_open, | |
6038f373 | 1142 | .llseek = noop_llseek, |
3a4d5c94 MT |
1143 | }; |
1144 | ||
1145 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1146 | .minor = VHOST_NET_MINOR, |
1147 | .name = "vhost-net", | |
1148 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1149 | }; |
1150 | ||
a8d3782f | 1151 | static int vhost_net_init(void) |
3a4d5c94 | 1152 | { |
bab632d6 | 1153 | if (experimental_zcopytx) |
fe729a57 | 1154 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1155 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1156 | } |
1157 | module_init(vhost_net_init); | |
1158 | ||
a8d3782f | 1159 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1160 | { |
1161 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1162 | } |
1163 | module_exit(vhost_net_exit); | |
1164 | ||
1165 | MODULE_VERSION("0.0.1"); | |
1166 | MODULE_LICENSE("GPL v2"); | |
1167 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1168 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1169 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1170 | MODULE_ALIAS("devname:vhost-net"); |