Commit | Line | Data |
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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> | |
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) | | |
4e9fa50c | 64 | (1ULL << VIRTIO_NET_F_MRG_RXBUF) |
8570a6e7 AH |
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 { |
0ad8b480 MT |
74 | /* refcount follows semantics similar to kref: |
75 | * 0: object is released | |
76 | * 1: no outstanding ubufs | |
77 | * >1: outstanding ubufs | |
78 | */ | |
79 | atomic_t refcount; | |
2839400f AH |
80 | wait_queue_head_t wait; |
81 | struct vhost_virtqueue *vq; | |
82 | }; | |
83 | ||
3ab2e420 AH |
84 | struct vhost_net_virtqueue { |
85 | struct vhost_virtqueue vq; | |
81f95a55 MT |
86 | size_t vhost_hlen; |
87 | size_t sock_hlen; | |
2839400f AH |
88 | /* vhost zerocopy support fields below: */ |
89 | /* last used idx for outstanding DMA zerocopy buffers */ | |
90 | int upend_idx; | |
91 | /* first used idx for DMA done zerocopy buffers */ | |
92 | int done_idx; | |
93 | /* an array of userspace buffers info */ | |
94 | struct ubuf_info *ubuf_info; | |
95 | /* Reference counting for outstanding ubufs. | |
96 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 97 | struct vhost_net_ubuf_ref *ubufs; |
3ab2e420 AH |
98 | }; |
99 | ||
3a4d5c94 MT |
100 | struct vhost_net { |
101 | struct vhost_dev dev; | |
3ab2e420 | 102 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 103 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
104 | /* Number of TX recently submitted. |
105 | * Protected by tx vq lock. */ | |
106 | unsigned tx_packets; | |
107 | /* Number of times zerocopy TX recently failed. | |
108 | * Protected by tx vq lock. */ | |
109 | unsigned tx_zcopy_err; | |
1280c27f MT |
110 | /* Flush in progress. Protected by tx vq lock. */ |
111 | bool tx_flush; | |
3a4d5c94 MT |
112 | }; |
113 | ||
fe729a57 | 114 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 115 | |
fe729a57 | 116 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 117 | { |
fe729a57 | 118 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
119 | } |
120 | ||
fe729a57 AH |
121 | static struct vhost_net_ubuf_ref * |
122 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 123 | { |
fe729a57 | 124 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
125 | /* No zero copy backend? Nothing to count. */ |
126 | if (!zcopy) | |
127 | return NULL; | |
128 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
129 | if (!ubufs) | |
130 | return ERR_PTR(-ENOMEM); | |
0ad8b480 | 131 | atomic_set(&ubufs->refcount, 1); |
2839400f AH |
132 | init_waitqueue_head(&ubufs->wait); |
133 | ubufs->vq = vq; | |
134 | return ubufs; | |
135 | } | |
136 | ||
0ad8b480 | 137 | static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 138 | { |
0ad8b480 MT |
139 | int r = atomic_sub_return(1, &ubufs->refcount); |
140 | if (unlikely(!r)) | |
141 | wake_up(&ubufs->wait); | |
142 | return r; | |
2839400f AH |
143 | } |
144 | ||
fe729a57 | 145 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 146 | { |
0ad8b480 MT |
147 | vhost_net_ubuf_put(ubufs); |
148 | wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); | |
c38e39c3 MT |
149 | } |
150 | ||
151 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
152 | { | |
153 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
154 | kfree(ubufs); |
155 | } | |
156 | ||
b1ad8496 AH |
157 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
158 | { | |
b1ad8496 AH |
159 | int i; |
160 | ||
288cfe78 MT |
161 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
162 | kfree(n->vqs[i].ubuf_info); | |
163 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
164 | } |
165 | } | |
166 | ||
0a1febf7 | 167 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
168 | { |
169 | bool zcopy; | |
170 | int i; | |
171 | ||
288cfe78 | 172 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 173 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
174 | if (!zcopy) |
175 | continue; | |
176 | n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * | |
177 | UIO_MAXIOV, GFP_KERNEL); | |
178 | if (!n->vqs[i].ubuf_info) | |
179 | goto err; | |
180 | } | |
181 | return 0; | |
182 | ||
183 | err: | |
288cfe78 | 184 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
185 | return -ENOMEM; |
186 | } | |
187 | ||
0a1febf7 | 188 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
189 | { |
190 | int i; | |
191 | ||
288cfe78 MT |
192 | vhost_net_clear_ubuf_info(n); |
193 | ||
2839400f AH |
194 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
195 | n->vqs[i].done_idx = 0; | |
196 | n->vqs[i].upend_idx = 0; | |
197 | n->vqs[i].ubufs = NULL; | |
81f95a55 MT |
198 | n->vqs[i].vhost_hlen = 0; |
199 | n->vqs[i].sock_hlen = 0; | |
2839400f AH |
200 | } |
201 | ||
202 | } | |
203 | ||
eaae8132 MT |
204 | static void vhost_net_tx_packet(struct vhost_net *net) |
205 | { | |
206 | ++net->tx_packets; | |
207 | if (net->tx_packets < 1024) | |
208 | return; | |
209 | net->tx_packets = 0; | |
210 | net->tx_zcopy_err = 0; | |
211 | } | |
212 | ||
213 | static void vhost_net_tx_err(struct vhost_net *net) | |
214 | { | |
215 | ++net->tx_zcopy_err; | |
216 | } | |
217 | ||
218 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
219 | { | |
1280c27f MT |
220 | /* TX flush waits for outstanding DMAs to be done. |
221 | * Don't start new DMAs. | |
222 | */ | |
223 | return !net->tx_flush && | |
224 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
225 | } |
226 | ||
bab632d6 MT |
227 | static bool vhost_sock_zcopy(struct socket *sock) |
228 | { | |
229 | return unlikely(experimental_zcopytx) && | |
230 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
231 | } | |
232 | ||
b211616d MT |
233 | /* In case of DMA done not in order in lower device driver for some reason. |
234 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
235 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
236 | * guest used idx. | |
237 | */ | |
094afe7d JW |
238 | static void vhost_zerocopy_signal_used(struct vhost_net *net, |
239 | struct vhost_virtqueue *vq) | |
b211616d | 240 | { |
2839400f AH |
241 | struct vhost_net_virtqueue *nvq = |
242 | container_of(vq, struct vhost_net_virtqueue, vq); | |
c92112ae | 243 | int i, add; |
b211616d MT |
244 | int j = 0; |
245 | ||
2839400f | 246 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
247 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
248 | vhost_net_tx_err(net); | |
b211616d MT |
249 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
250 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
b211616d MT |
251 | ++j; |
252 | } else | |
253 | break; | |
254 | } | |
c92112ae JW |
255 | while (j) { |
256 | add = min(UIO_MAXIOV - nvq->done_idx, j); | |
257 | vhost_add_used_and_signal_n(vq->dev, vq, | |
258 | &vq->heads[nvq->done_idx], add); | |
259 | nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; | |
260 | j -= add; | |
261 | } | |
b211616d MT |
262 | } |
263 | ||
eaae8132 | 264 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 265 | { |
fe729a57 | 266 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 267 | struct vhost_virtqueue *vq = ubufs->vq; |
0ad8b480 | 268 | int cnt; |
24eb21a1 | 269 | |
b0c057ca MT |
270 | rcu_read_lock_bh(); |
271 | ||
19c73b3e JW |
272 | /* set len to mark this desc buffers done DMA */ |
273 | vq->heads[ubuf->desc].len = success ? | |
274 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
0ad8b480 | 275 | cnt = vhost_net_ubuf_put(ubufs); |
19c73b3e | 276 | |
24eb21a1 MT |
277 | /* |
278 | * Trigger polling thread if guest stopped submitting new buffers: | |
0ad8b480 | 279 | * in this case, the refcount after decrement will eventually reach 1. |
24eb21a1 MT |
280 | * We also trigger polling periodically after each 16 packets |
281 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
282 | * less than 10% of times). | |
283 | */ | |
0ad8b480 | 284 | if (cnt <= 1 || !(cnt % 16)) |
24eb21a1 | 285 | vhost_poll_queue(&vq->poll); |
b0c057ca MT |
286 | |
287 | rcu_read_unlock_bh(); | |
b211616d MT |
288 | } |
289 | ||
3a4d5c94 MT |
290 | /* Expects to be always run from workqueue - which acts as |
291 | * read-size critical section for our kind of RCU. */ | |
292 | static void handle_tx(struct vhost_net *net) | |
293 | { | |
2839400f | 294 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 295 | struct vhost_virtqueue *vq = &nvq->vq; |
98a527aa | 296 | unsigned out, in; |
d5675bd2 | 297 | int head; |
3a4d5c94 MT |
298 | struct msghdr msg = { |
299 | .msg_name = NULL, | |
300 | .msg_namelen = 0, | |
301 | .msg_control = NULL, | |
302 | .msg_controllen = 0, | |
3a4d5c94 MT |
303 | .msg_flags = MSG_DONTWAIT, |
304 | }; | |
305 | size_t len, total_len = 0; | |
70181d51 | 306 | int err; |
3a4d5c94 | 307 | size_t hdr_size; |
28457ee6 | 308 | struct socket *sock; |
fe729a57 | 309 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 310 | bool zcopy, zcopy_used; |
28457ee6 | 311 | |
2e26af79 AH |
312 | mutex_lock(&vq->mutex); |
313 | sock = vq->private_data; | |
3a4d5c94 | 314 | if (!sock) |
2e26af79 | 315 | goto out; |
3a4d5c94 | 316 | |
8ea8cf89 | 317 | vhost_disable_notify(&net->dev, vq); |
3a4d5c94 | 318 | |
81f95a55 | 319 | hdr_size = nvq->vhost_hlen; |
2839400f | 320 | zcopy = nvq->ubufs; |
3a4d5c94 MT |
321 | |
322 | for (;;) { | |
bab632d6 MT |
323 | /* Release DMAs done buffers first */ |
324 | if (zcopy) | |
eaae8132 | 325 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 326 | |
f7c6be40 JW |
327 | /* If more outstanding DMAs, queue the work. |
328 | * Handle upend_idx wrap around | |
329 | */ | |
330 | if (unlikely((nvq->upend_idx + vq->num - VHOST_MAX_PEND) | |
331 | % UIO_MAXIOV == nvq->done_idx)) | |
332 | break; | |
333 | ||
47283bef | 334 | head = vhost_get_vq_desc(vq, vq->iov, |
3a4d5c94 MT |
335 | ARRAY_SIZE(vq->iov), |
336 | &out, &in, | |
337 | NULL, NULL); | |
d5675bd2 | 338 | /* On error, stop handling until the next kick. */ |
7b3384fc | 339 | if (unlikely(head < 0)) |
d5675bd2 | 340 | break; |
3a4d5c94 MT |
341 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
342 | if (head == vq->num) { | |
8ea8cf89 MT |
343 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
344 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
345 | continue; |
346 | } | |
347 | break; | |
348 | } | |
349 | if (in) { | |
350 | vq_err(vq, "Unexpected descriptor format for TX: " | |
351 | "out %d, int %d\n", out, in); | |
352 | break; | |
353 | } | |
354 | /* Skip header. TODO: support TSO. */ | |
3a4d5c94 | 355 | len = iov_length(vq->iov, out); |
c0371da6 | 356 | iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len); |
98a527aa | 357 | iov_iter_advance(&msg.msg_iter, hdr_size); |
3a4d5c94 | 358 | /* Sanity check */ |
01e97e65 | 359 | if (!msg_data_left(&msg)) { |
3a4d5c94 MT |
360 | vq_err(vq, "Unexpected header len for TX: " |
361 | "%zd expected %zd\n", | |
98a527aa | 362 | len, hdr_size); |
3a4d5c94 MT |
363 | break; |
364 | } | |
01e97e65 | 365 | len = msg_data_left(&msg); |
ce21a029 JW |
366 | |
367 | zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN | |
368 | && (nvq->upend_idx + 1) % UIO_MAXIOV != | |
369 | nvq->done_idx | |
370 | && vhost_net_tx_select_zcopy(net); | |
cedb9bdc | 371 | |
bab632d6 | 372 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 373 | if (zcopy_used) { |
ce21a029 JW |
374 | struct ubuf_info *ubuf; |
375 | ubuf = nvq->ubuf_info + nvq->upend_idx; | |
376 | ||
8b38694a | 377 | vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); |
ce21a029 JW |
378 | vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; |
379 | ubuf->callback = vhost_zerocopy_callback; | |
380 | ubuf->ctx = nvq->ubufs; | |
381 | ubuf->desc = nvq->upend_idx; | |
382 | msg.msg_control = ubuf; | |
383 | msg.msg_controllen = sizeof(ubuf); | |
384 | ubufs = nvq->ubufs; | |
0ad8b480 | 385 | atomic_inc(&ubufs->refcount); |
2839400f | 386 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
ce21a029 | 387 | } else { |
4364d5f9 | 388 | msg.msg_control = NULL; |
ce21a029 JW |
389 | ubufs = NULL; |
390 | } | |
3a4d5c94 | 391 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
1b784140 | 392 | err = sock->ops->sendmsg(sock, &msg, len); |
3a4d5c94 | 393 | if (unlikely(err < 0)) { |
cedb9bdc | 394 | if (zcopy_used) { |
ce21a029 | 395 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
396 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
397 | % UIO_MAXIOV; | |
bab632d6 | 398 | } |
8dd014ad | 399 | vhost_discard_vq_desc(vq, 1); |
3a4d5c94 MT |
400 | break; |
401 | } | |
402 | if (err != len) | |
95c0ec6a MT |
403 | pr_debug("Truncated TX packet: " |
404 | " len %d != %zd\n", err, len); | |
cedb9bdc | 405 | if (!zcopy_used) |
bab632d6 | 406 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 407 | else |
eaae8132 | 408 | vhost_zerocopy_signal_used(net, vq); |
3a4d5c94 | 409 | total_len += len; |
eaae8132 | 410 | vhost_net_tx_packet(net); |
3a4d5c94 MT |
411 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
412 | vhost_poll_queue(&vq->poll); | |
413 | break; | |
414 | } | |
415 | } | |
2e26af79 | 416 | out: |
3a4d5c94 | 417 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
418 | } |
419 | ||
8dd014ad DS |
420 | static int peek_head_len(struct sock *sk) |
421 | { | |
422 | struct sk_buff *head; | |
423 | int len = 0; | |
783e3988 | 424 | unsigned long flags; |
8dd014ad | 425 | |
783e3988 | 426 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 427 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 428 | if (likely(head)) { |
8dd014ad | 429 | len = head->len; |
df8a39de | 430 | if (skb_vlan_tag_present(head)) |
c53cff5e BG |
431 | len += VLAN_HLEN; |
432 | } | |
433 | ||
783e3988 | 434 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
435 | return len; |
436 | } | |
437 | ||
438 | /* This is a multi-buffer version of vhost_get_desc, that works if | |
439 | * vq has read descriptors only. | |
440 | * @vq - the relevant virtqueue | |
441 | * @datalen - data length we'll be reading | |
442 | * @iovcount - returned count of io vectors we fill | |
443 | * @log - vhost log | |
444 | * @log_num - log offset | |
94249369 | 445 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
446 | * returns number of buffer heads allocated, negative on error |
447 | */ | |
448 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
449 | struct vring_used_elem *heads, | |
450 | int datalen, | |
451 | unsigned *iovcount, | |
452 | struct vhost_log *log, | |
94249369 JW |
453 | unsigned *log_num, |
454 | unsigned int quota) | |
8dd014ad DS |
455 | { |
456 | unsigned int out, in; | |
457 | int seg = 0; | |
458 | int headcount = 0; | |
459 | unsigned d; | |
460 | int r, nlogs = 0; | |
8b38694a MT |
461 | /* len is always initialized before use since we are always called with |
462 | * datalen > 0. | |
463 | */ | |
464 | u32 uninitialized_var(len); | |
8dd014ad | 465 | |
94249369 | 466 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 467 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
468 | r = -ENOBUFS; |
469 | goto err; | |
470 | } | |
47283bef | 471 | r = vhost_get_vq_desc(vq, vq->iov + seg, |
8dd014ad DS |
472 | ARRAY_SIZE(vq->iov) - seg, &out, |
473 | &in, log, log_num); | |
a39ee449 MT |
474 | if (unlikely(r < 0)) |
475 | goto err; | |
476 | ||
477 | d = r; | |
8dd014ad DS |
478 | if (d == vq->num) { |
479 | r = 0; | |
480 | goto err; | |
481 | } | |
482 | if (unlikely(out || in <= 0)) { | |
483 | vq_err(vq, "unexpected descriptor format for RX: " | |
484 | "out %d, in %d\n", out, in); | |
485 | r = -EINVAL; | |
486 | goto err; | |
487 | } | |
488 | if (unlikely(log)) { | |
489 | nlogs += *log_num; | |
490 | log += *log_num; | |
491 | } | |
8b38694a MT |
492 | heads[headcount].id = cpu_to_vhost32(vq, d); |
493 | len = iov_length(vq->iov + seg, in); | |
494 | heads[headcount].len = cpu_to_vhost32(vq, len); | |
495 | datalen -= len; | |
8dd014ad DS |
496 | ++headcount; |
497 | seg += in; | |
498 | } | |
99975cc6 | 499 | heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); |
8dd014ad DS |
500 | *iovcount = seg; |
501 | if (unlikely(log)) | |
502 | *log_num = nlogs; | |
d8316f39 MT |
503 | |
504 | /* Detect overrun */ | |
505 | if (unlikely(datalen > 0)) { | |
506 | r = UIO_MAXIOV + 1; | |
507 | goto err; | |
508 | } | |
8dd014ad DS |
509 | return headcount; |
510 | err: | |
511 | vhost_discard_vq_desc(vq, headcount); | |
512 | return r; | |
513 | } | |
514 | ||
3a4d5c94 MT |
515 | /* Expects to be always run from workqueue - which acts as |
516 | * read-size critical section for our kind of RCU. */ | |
94249369 | 517 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 518 | { |
81f95a55 MT |
519 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
520 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
521 | unsigned uninitialized_var(in), log; |
522 | struct vhost_log *vq_log; | |
523 | struct msghdr msg = { | |
524 | .msg_name = NULL, | |
525 | .msg_namelen = 0, | |
526 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
527 | .msg_controllen = 0, | |
8dd014ad DS |
528 | .msg_flags = MSG_DONTWAIT, |
529 | }; | |
0960b641 JW |
530 | struct virtio_net_hdr hdr = { |
531 | .flags = 0, | |
532 | .gso_type = VIRTIO_NET_HDR_GSO_NONE | |
8dd014ad | 533 | }; |
8dd014ad | 534 | size_t total_len = 0; |
910a578f MT |
535 | int err, mergeable; |
536 | s16 headcount; | |
8dd014ad DS |
537 | size_t vhost_hlen, sock_hlen; |
538 | size_t vhost_len, sock_len; | |
2e26af79 | 539 | struct socket *sock; |
ba7438ae | 540 | struct iov_iter fixup; |
0960b641 | 541 | __virtio16 num_buffers; |
8dd014ad | 542 | |
8dd014ad | 543 | mutex_lock(&vq->mutex); |
2e26af79 AH |
544 | sock = vq->private_data; |
545 | if (!sock) | |
546 | goto out; | |
8ea8cf89 | 547 | vhost_disable_notify(&net->dev, vq); |
2e26af79 | 548 | |
81f95a55 MT |
549 | vhost_hlen = nvq->vhost_hlen; |
550 | sock_hlen = nvq->sock_hlen; | |
8dd014ad | 551 | |
ea16c514 | 552 | vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ? |
8dd014ad | 553 | vq->log : NULL; |
ea16c514 | 554 | mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad DS |
555 | |
556 | while ((sock_len = peek_head_len(sock->sk))) { | |
557 | sock_len += sock_hlen; | |
558 | vhost_len = sock_len + vhost_hlen; | |
559 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, | |
94249369 JW |
560 | &in, vq_log, &log, |
561 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
562 | /* On error, stop handling until the next kick. */ |
563 | if (unlikely(headcount < 0)) | |
564 | break; | |
d8316f39 MT |
565 | /* On overrun, truncate and discard */ |
566 | if (unlikely(headcount > UIO_MAXIOV)) { | |
c0371da6 | 567 | iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); |
1b784140 | 568 | err = sock->ops->recvmsg(sock, &msg, |
d8316f39 MT |
569 | 1, MSG_DONTWAIT | MSG_TRUNC); |
570 | pr_debug("Discarded rx packet: len %zd\n", sock_len); | |
571 | continue; | |
572 | } | |
8dd014ad DS |
573 | /* OK, now we need to know about added descriptors. */ |
574 | if (!headcount) { | |
8ea8cf89 | 575 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
576 | /* They have slipped one in as we were |
577 | * doing that: check again. */ | |
8ea8cf89 | 578 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
579 | continue; |
580 | } | |
581 | /* Nothing new? Wait for eventfd to tell us | |
582 | * they refilled. */ | |
583 | break; | |
584 | } | |
585 | /* We don't need to be notified again. */ | |
ba7438ae AV |
586 | iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len); |
587 | fixup = msg.msg_iter; | |
588 | if (unlikely((vhost_hlen))) { | |
589 | /* We will supply the header ourselves | |
590 | * TODO: support TSO. | |
591 | */ | |
592 | iov_iter_advance(&msg.msg_iter, vhost_hlen); | |
ba7438ae | 593 | } |
1b784140 | 594 | err = sock->ops->recvmsg(sock, &msg, |
8dd014ad DS |
595 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
596 | /* Userspace might have consumed the packet meanwhile: | |
597 | * it's not supposed to do this usually, but might be hard | |
598 | * to prevent. Discard data we got (if any) and keep going. */ | |
599 | if (unlikely(err != sock_len)) { | |
600 | pr_debug("Discarded rx packet: " | |
601 | " len %d, expected %zd\n", err, sock_len); | |
602 | vhost_discard_vq_desc(vq, headcount); | |
603 | continue; | |
604 | } | |
ba7438ae | 605 | /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ |
4c5a8442 MT |
606 | if (unlikely(vhost_hlen)) { |
607 | if (copy_to_iter(&hdr, sizeof(hdr), | |
608 | &fixup) != sizeof(hdr)) { | |
609 | vq_err(vq, "Unable to write vnet_hdr " | |
610 | "at addr %p\n", vq->iov->iov_base); | |
611 | break; | |
612 | } | |
613 | } else { | |
614 | /* Header came from socket; we'll need to patch | |
615 | * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF | |
616 | */ | |
617 | iov_iter_advance(&fixup, sizeof(hdr)); | |
8dd014ad DS |
618 | } |
619 | /* TODO: Should check and handle checksum. */ | |
5201aa49 | 620 | |
0960b641 | 621 | num_buffers = cpu_to_vhost16(vq, headcount); |
cfbdab95 | 622 | if (likely(mergeable) && |
0d79a493 MT |
623 | copy_to_iter(&num_buffers, sizeof num_buffers, |
624 | &fixup) != sizeof num_buffers) { | |
8dd014ad DS |
625 | vq_err(vq, "Failed num_buffers write"); |
626 | vhost_discard_vq_desc(vq, headcount); | |
627 | break; | |
628 | } | |
629 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
630 | headcount); | |
631 | if (unlikely(vq_log)) | |
632 | vhost_log_write(vq, vq_log, log, vhost_len); | |
633 | total_len += vhost_len; | |
634 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
635 | vhost_poll_queue(&vq->poll); | |
636 | break; | |
637 | } | |
638 | } | |
2e26af79 | 639 | out: |
8dd014ad | 640 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
641 | } |
642 | ||
c23f3445 | 643 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 644 | { |
c23f3445 TH |
645 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
646 | poll.work); | |
647 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
648 | ||
3a4d5c94 MT |
649 | handle_tx(net); |
650 | } | |
651 | ||
c23f3445 | 652 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 653 | { |
c23f3445 TH |
654 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
655 | poll.work); | |
656 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
657 | ||
3a4d5c94 MT |
658 | handle_rx(net); |
659 | } | |
660 | ||
c23f3445 | 661 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 662 | { |
c23f3445 TH |
663 | struct vhost_net *net = container_of(work, struct vhost_net, |
664 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
665 | handle_tx(net); |
666 | } | |
667 | ||
c23f3445 | 668 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 669 | { |
c23f3445 TH |
670 | struct vhost_net *net = container_of(work, struct vhost_net, |
671 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
672 | handle_rx(net); |
673 | } | |
674 | ||
675 | static int vhost_net_open(struct inode *inode, struct file *f) | |
676 | { | |
23cc5a99 | 677 | struct vhost_net *n; |
c23f3445 | 678 | struct vhost_dev *dev; |
3ab2e420 | 679 | struct vhost_virtqueue **vqs; |
59566b6e | 680 | int i; |
c23f3445 | 681 | |
23cc5a99 MT |
682 | n = kmalloc(sizeof *n, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
683 | if (!n) { | |
684 | n = vmalloc(sizeof *n); | |
685 | if (!n) | |
686 | return -ENOMEM; | |
687 | } | |
3ab2e420 AH |
688 | vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
689 | if (!vqs) { | |
d04257b0 | 690 | kvfree(n); |
3ab2e420 AH |
691 | return -ENOMEM; |
692 | } | |
c23f3445 TH |
693 | |
694 | dev = &n->dev; | |
3ab2e420 AH |
695 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
696 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
697 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
698 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
699 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
700 | n->vqs[i].ubufs = NULL; | |
701 | n->vqs[i].ubuf_info = NULL; | |
702 | n->vqs[i].upend_idx = 0; | |
703 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
704 | n->vqs[i].vhost_hlen = 0; |
705 | n->vqs[i].sock_hlen = 0; | |
2839400f | 706 | } |
59566b6e | 707 | vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 | 708 | |
c23f3445 TH |
709 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
710 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); | |
3a4d5c94 MT |
711 | |
712 | f->private_data = n; | |
713 | ||
714 | return 0; | |
715 | } | |
716 | ||
717 | static void vhost_net_disable_vq(struct vhost_net *n, | |
718 | struct vhost_virtqueue *vq) | |
719 | { | |
3ab2e420 AH |
720 | struct vhost_net_virtqueue *nvq = |
721 | container_of(vq, struct vhost_net_virtqueue, vq); | |
722 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
3a4d5c94 MT |
723 | if (!vq->private_data) |
724 | return; | |
70181d51 | 725 | vhost_poll_stop(poll); |
3a4d5c94 MT |
726 | } |
727 | ||
2b8b328b | 728 | static int vhost_net_enable_vq(struct vhost_net *n, |
3a4d5c94 MT |
729 | struct vhost_virtqueue *vq) |
730 | { | |
3ab2e420 AH |
731 | struct vhost_net_virtqueue *nvq = |
732 | container_of(vq, struct vhost_net_virtqueue, vq); | |
733 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
28457ee6 AB |
734 | struct socket *sock; |
735 | ||
22fa90c7 | 736 | sock = vq->private_data; |
3a4d5c94 | 737 | if (!sock) |
2b8b328b | 738 | return 0; |
2b8b328b | 739 | |
70181d51 | 740 | return vhost_poll_start(poll, sock->file); |
3a4d5c94 MT |
741 | } |
742 | ||
743 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, | |
744 | struct vhost_virtqueue *vq) | |
745 | { | |
746 | struct socket *sock; | |
747 | ||
748 | mutex_lock(&vq->mutex); | |
22fa90c7 | 749 | sock = vq->private_data; |
3a4d5c94 | 750 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 751 | vq->private_data = NULL; |
3a4d5c94 MT |
752 | mutex_unlock(&vq->mutex); |
753 | return sock; | |
754 | } | |
755 | ||
756 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
757 | struct socket **rx_sock) | |
758 | { | |
3ab2e420 AH |
759 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
760 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
761 | } |
762 | ||
763 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
764 | { | |
765 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 766 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
767 | } |
768 | ||
769 | static void vhost_net_flush(struct vhost_net *n) | |
770 | { | |
771 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
772 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 773 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 774 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 775 | n->tx_flush = true; |
3ab2e420 | 776 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 777 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 778 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 779 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 780 | n->tx_flush = false; |
0ad8b480 | 781 | atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); |
3ab2e420 | 782 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 783 | } |
3a4d5c94 MT |
784 | } |
785 | ||
786 | static int vhost_net_release(struct inode *inode, struct file *f) | |
787 | { | |
788 | struct vhost_net *n = f->private_data; | |
789 | struct socket *tx_sock; | |
790 | struct socket *rx_sock; | |
791 | ||
792 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
793 | vhost_net_flush(n); | |
b211616d | 794 | vhost_dev_stop(&n->dev); |
ea5d4046 | 795 | vhost_dev_cleanup(&n->dev, false); |
81f95a55 | 796 | vhost_net_vq_reset(n); |
3a4d5c94 | 797 | if (tx_sock) |
09aaacf0 | 798 | sockfd_put(tx_sock); |
3a4d5c94 | 799 | if (rx_sock) |
09aaacf0 | 800 | sockfd_put(rx_sock); |
b0c057ca MT |
801 | /* Make sure no callbacks are outstanding */ |
802 | synchronize_rcu_bh(); | |
3a4d5c94 MT |
803 | /* We do an extra flush before freeing memory, |
804 | * since jobs can re-queue themselves. */ | |
805 | vhost_net_flush(n); | |
3ab2e420 | 806 | kfree(n->dev.vqs); |
d04257b0 | 807 | kvfree(n); |
3a4d5c94 MT |
808 | return 0; |
809 | } | |
810 | ||
811 | static struct socket *get_raw_socket(int fd) | |
812 | { | |
813 | struct { | |
814 | struct sockaddr_ll sa; | |
815 | char buf[MAX_ADDR_LEN]; | |
816 | } uaddr; | |
817 | int uaddr_len = sizeof uaddr, r; | |
818 | struct socket *sock = sockfd_lookup(fd, &r); | |
d47effe1 | 819 | |
3a4d5c94 MT |
820 | if (!sock) |
821 | return ERR_PTR(-ENOTSOCK); | |
822 | ||
823 | /* Parameter checking */ | |
824 | if (sock->sk->sk_type != SOCK_RAW) { | |
825 | r = -ESOCKTNOSUPPORT; | |
826 | goto err; | |
827 | } | |
828 | ||
829 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
830 | &uaddr_len, 0); | |
831 | if (r) | |
832 | goto err; | |
833 | ||
834 | if (uaddr.sa.sll_family != AF_PACKET) { | |
835 | r = -EPFNOSUPPORT; | |
836 | goto err; | |
837 | } | |
838 | return sock; | |
839 | err: | |
09aaacf0 | 840 | sockfd_put(sock); |
3a4d5c94 MT |
841 | return ERR_PTR(r); |
842 | } | |
843 | ||
501c774c | 844 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
845 | { |
846 | struct file *file = fget(fd); | |
847 | struct socket *sock; | |
d47effe1 | 848 | |
3a4d5c94 MT |
849 | if (!file) |
850 | return ERR_PTR(-EBADF); | |
851 | sock = tun_get_socket(file); | |
501c774c AB |
852 | if (!IS_ERR(sock)) |
853 | return sock; | |
854 | sock = macvtap_get_socket(file); | |
3a4d5c94 MT |
855 | if (IS_ERR(sock)) |
856 | fput(file); | |
857 | return sock; | |
858 | } | |
859 | ||
860 | static struct socket *get_socket(int fd) | |
861 | { | |
862 | struct socket *sock; | |
d47effe1 | 863 | |
3a4d5c94 MT |
864 | /* special case to disable backend */ |
865 | if (fd == -1) | |
866 | return NULL; | |
867 | sock = get_raw_socket(fd); | |
868 | if (!IS_ERR(sock)) | |
869 | return sock; | |
501c774c | 870 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
871 | if (!IS_ERR(sock)) |
872 | return sock; | |
873 | return ERR_PTR(-ENOTSOCK); | |
874 | } | |
875 | ||
876 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
877 | { | |
878 | struct socket *sock, *oldsock; | |
879 | struct vhost_virtqueue *vq; | |
2839400f | 880 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 881 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
882 | int r; |
883 | ||
884 | mutex_lock(&n->dev.mutex); | |
885 | r = vhost_dev_check_owner(&n->dev); | |
886 | if (r) | |
887 | goto err; | |
888 | ||
889 | if (index >= VHOST_NET_VQ_MAX) { | |
890 | r = -ENOBUFS; | |
891 | goto err; | |
892 | } | |
3ab2e420 | 893 | vq = &n->vqs[index].vq; |
2839400f | 894 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
895 | mutex_lock(&vq->mutex); |
896 | ||
897 | /* Verify that ring has been setup correctly. */ | |
898 | if (!vhost_vq_access_ok(vq)) { | |
899 | r = -EFAULT; | |
1dace8c8 | 900 | goto err_vq; |
3a4d5c94 MT |
901 | } |
902 | sock = get_socket(fd); | |
903 | if (IS_ERR(sock)) { | |
904 | r = PTR_ERR(sock); | |
1dace8c8 | 905 | goto err_vq; |
3a4d5c94 MT |
906 | } |
907 | ||
908 | /* start polling new socket */ | |
22fa90c7 | 909 | oldsock = vq->private_data; |
11fe8839 | 910 | if (sock != oldsock) { |
fe729a57 AH |
911 | ubufs = vhost_net_ubuf_alloc(vq, |
912 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
913 | if (IS_ERR(ubufs)) { |
914 | r = PTR_ERR(ubufs); | |
915 | goto err_ubufs; | |
916 | } | |
692a998b | 917 | |
d47effe1 | 918 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 919 | vq->private_data = sock; |
f59281da JW |
920 | r = vhost_init_used(vq); |
921 | if (r) | |
692a998b | 922 | goto err_used; |
2b8b328b JW |
923 | r = vhost_net_enable_vq(n, vq); |
924 | if (r) | |
925 | goto err_used; | |
692a998b | 926 | |
2839400f AH |
927 | oldubufs = nvq->ubufs; |
928 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
929 | |
930 | n->tx_packets = 0; | |
931 | n->tx_zcopy_err = 0; | |
1280c27f | 932 | n->tx_flush = false; |
dd1f4078 | 933 | } |
3a4d5c94 | 934 | |
1680e906 MT |
935 | mutex_unlock(&vq->mutex); |
936 | ||
c047e5f3 | 937 | if (oldubufs) { |
c38e39c3 | 938 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 939 | mutex_lock(&vq->mutex); |
eaae8132 | 940 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
941 | mutex_unlock(&vq->mutex); |
942 | } | |
bab632d6 | 943 | |
3a4d5c94 MT |
944 | if (oldsock) { |
945 | vhost_net_flush_vq(n, index); | |
09aaacf0 | 946 | sockfd_put(oldsock); |
3a4d5c94 | 947 | } |
1dace8c8 | 948 | |
1680e906 MT |
949 | mutex_unlock(&n->dev.mutex); |
950 | return 0; | |
951 | ||
692a998b | 952 | err_used: |
22fa90c7 | 953 | vq->private_data = oldsock; |
692a998b JW |
954 | vhost_net_enable_vq(n, vq); |
955 | if (ubufs) | |
c38e39c3 | 956 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 | 957 | err_ubufs: |
09aaacf0 | 958 | sockfd_put(sock); |
1dace8c8 JD |
959 | err_vq: |
960 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
961 | err: |
962 | mutex_unlock(&n->dev.mutex); | |
963 | return r; | |
964 | } | |
965 | ||
966 | static long vhost_net_reset_owner(struct vhost_net *n) | |
967 | { | |
968 | struct socket *tx_sock = NULL; | |
969 | struct socket *rx_sock = NULL; | |
970 | long err; | |
150b9e51 | 971 | struct vhost_memory *memory; |
d47effe1 | 972 | |
3a4d5c94 MT |
973 | mutex_lock(&n->dev.mutex); |
974 | err = vhost_dev_check_owner(&n->dev); | |
975 | if (err) | |
976 | goto done; | |
150b9e51 MT |
977 | memory = vhost_dev_reset_owner_prepare(); |
978 | if (!memory) { | |
979 | err = -ENOMEM; | |
980 | goto done; | |
981 | } | |
3a4d5c94 MT |
982 | vhost_net_stop(n, &tx_sock, &rx_sock); |
983 | vhost_net_flush(n); | |
150b9e51 | 984 | vhost_dev_reset_owner(&n->dev, memory); |
81f95a55 | 985 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
986 | done: |
987 | mutex_unlock(&n->dev.mutex); | |
988 | if (tx_sock) | |
09aaacf0 | 989 | sockfd_put(tx_sock); |
3a4d5c94 | 990 | if (rx_sock) |
09aaacf0 | 991 | sockfd_put(rx_sock); |
3a4d5c94 MT |
992 | return err; |
993 | } | |
994 | ||
995 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
996 | { | |
8dd014ad | 997 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 998 | int i; |
8dd014ad | 999 | |
e4fca7d6 MT |
1000 | hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
1001 | (1ULL << VIRTIO_F_VERSION_1))) ? | |
8dd014ad DS |
1002 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
1003 | sizeof(struct virtio_net_hdr); | |
1004 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1005 | /* vhost provides vnet_hdr */ | |
1006 | vhost_hlen = hdr_len; | |
1007 | sock_hlen = 0; | |
1008 | } else { | |
1009 | /* socket provides vnet_hdr */ | |
1010 | vhost_hlen = 0; | |
1011 | sock_hlen = hdr_len; | |
1012 | } | |
3a4d5c94 MT |
1013 | mutex_lock(&n->dev.mutex); |
1014 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
1015 | !vhost_log_access_ok(&n->dev)) { | |
1016 | mutex_unlock(&n->dev.mutex); | |
1017 | return -EFAULT; | |
1018 | } | |
3a4d5c94 | 1019 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
3ab2e420 | 1020 | mutex_lock(&n->vqs[i].vq.mutex); |
ea16c514 | 1021 | n->vqs[i].vq.acked_features = features; |
81f95a55 MT |
1022 | n->vqs[i].vhost_hlen = vhost_hlen; |
1023 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1024 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 | 1025 | } |
3a4d5c94 MT |
1026 | mutex_unlock(&n->dev.mutex); |
1027 | return 0; | |
1028 | } | |
1029 | ||
b1ad8496 AH |
1030 | static long vhost_net_set_owner(struct vhost_net *n) |
1031 | { | |
1032 | int r; | |
1033 | ||
1034 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1035 | if (vhost_dev_has_owner(&n->dev)) { |
1036 | r = -EBUSY; | |
1037 | goto out; | |
1038 | } | |
b1ad8496 AH |
1039 | r = vhost_net_set_ubuf_info(n); |
1040 | if (r) | |
1041 | goto out; | |
1042 | r = vhost_dev_set_owner(&n->dev); | |
1043 | if (r) | |
1044 | vhost_net_clear_ubuf_info(n); | |
1045 | vhost_net_flush(n); | |
1046 | out: | |
1047 | mutex_unlock(&n->dev.mutex); | |
1048 | return r; | |
1049 | } | |
1050 | ||
3a4d5c94 MT |
1051 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1052 | unsigned long arg) | |
1053 | { | |
1054 | struct vhost_net *n = f->private_data; | |
1055 | void __user *argp = (void __user *)arg; | |
1056 | u64 __user *featurep = argp; | |
1057 | struct vhost_vring_file backend; | |
1058 | u64 features; | |
1059 | int r; | |
d47effe1 | 1060 | |
3a4d5c94 MT |
1061 | switch (ioctl) { |
1062 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1063 | if (copy_from_user(&backend, argp, sizeof backend)) |
1064 | return -EFAULT; | |
3a4d5c94 MT |
1065 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1066 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1067 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1068 | if (copy_to_user(featurep, &features, sizeof features)) |
1069 | return -EFAULT; | |
1070 | return 0; | |
3a4d5c94 | 1071 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1072 | if (copy_from_user(&features, featurep, sizeof features)) |
1073 | return -EFAULT; | |
0dd05a3b | 1074 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1075 | return -EOPNOTSUPP; |
1076 | return vhost_net_set_features(n, features); | |
1077 | case VHOST_RESET_OWNER: | |
1078 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1079 | case VHOST_SET_OWNER: |
1080 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1081 | default: |
1082 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1083 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1084 | if (r == -ENOIOCTLCMD) | |
1085 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1086 | else | |
1087 | vhost_net_flush(n); | |
3a4d5c94 MT |
1088 | mutex_unlock(&n->dev.mutex); |
1089 | return r; | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | #ifdef CONFIG_COMPAT | |
1094 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1095 | unsigned long arg) | |
1096 | { | |
1097 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1098 | } | |
1099 | #endif | |
1100 | ||
373a83a6 | 1101 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1102 | .owner = THIS_MODULE, |
1103 | .release = vhost_net_release, | |
1104 | .unlocked_ioctl = vhost_net_ioctl, | |
1105 | #ifdef CONFIG_COMPAT | |
1106 | .compat_ioctl = vhost_net_compat_ioctl, | |
1107 | #endif | |
1108 | .open = vhost_net_open, | |
6038f373 | 1109 | .llseek = noop_llseek, |
3a4d5c94 MT |
1110 | }; |
1111 | ||
1112 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1113 | .minor = VHOST_NET_MINOR, |
1114 | .name = "vhost-net", | |
1115 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1116 | }; |
1117 | ||
a8d3782f | 1118 | static int vhost_net_init(void) |
3a4d5c94 | 1119 | { |
bab632d6 | 1120 | if (experimental_zcopytx) |
fe729a57 | 1121 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1122 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1123 | } |
1124 | module_init(vhost_net_init); | |
1125 | ||
a8d3782f | 1126 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1127 | { |
1128 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1129 | } |
1130 | module_exit(vhost_net_exit); | |
1131 | ||
1132 | MODULE_VERSION("0.0.1"); | |
1133 | MODULE_LICENSE("GPL v2"); | |
1134 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1135 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1136 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1137 | MODULE_ALIAS("devname:vhost-net"); |