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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) | | |
6b1e6cc7 JW |
64 | (1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
65 | (1ULL << VIRTIO_F_IOMMU_PLATFORM) | |
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 | size_t vhost_hlen; |
88 | size_t sock_hlen; | |
2839400f AH |
89 | /* vhost zerocopy support fields below: */ |
90 | /* last used idx for outstanding DMA zerocopy buffers */ | |
91 | int upend_idx; | |
92 | /* first used idx for DMA done zerocopy buffers */ | |
93 | int done_idx; | |
94 | /* an array of userspace buffers info */ | |
95 | struct ubuf_info *ubuf_info; | |
96 | /* Reference counting for outstanding ubufs. | |
97 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 98 | struct vhost_net_ubuf_ref *ubufs; |
3ab2e420 AH |
99 | }; |
100 | ||
3a4d5c94 MT |
101 | struct vhost_net { |
102 | struct vhost_dev dev; | |
3ab2e420 | 103 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 104 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
105 | /* Number of TX recently submitted. |
106 | * Protected by tx vq lock. */ | |
107 | unsigned tx_packets; | |
108 | /* Number of times zerocopy TX recently failed. | |
109 | * Protected by tx vq lock. */ | |
110 | unsigned tx_zcopy_err; | |
1280c27f MT |
111 | /* Flush in progress. Protected by tx vq lock. */ |
112 | bool tx_flush; | |
3a4d5c94 MT |
113 | }; |
114 | ||
fe729a57 | 115 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 116 | |
fe729a57 | 117 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 118 | { |
fe729a57 | 119 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
120 | } |
121 | ||
fe729a57 AH |
122 | static struct vhost_net_ubuf_ref * |
123 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 124 | { |
fe729a57 | 125 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
126 | /* No zero copy backend? Nothing to count. */ |
127 | if (!zcopy) | |
128 | return NULL; | |
129 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
130 | if (!ubufs) | |
131 | return ERR_PTR(-ENOMEM); | |
0ad8b480 | 132 | atomic_set(&ubufs->refcount, 1); |
2839400f AH |
133 | init_waitqueue_head(&ubufs->wait); |
134 | ubufs->vq = vq; | |
135 | return ubufs; | |
136 | } | |
137 | ||
0ad8b480 | 138 | static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 139 | { |
0ad8b480 MT |
140 | int r = atomic_sub_return(1, &ubufs->refcount); |
141 | if (unlikely(!r)) | |
142 | wake_up(&ubufs->wait); | |
143 | return r; | |
2839400f AH |
144 | } |
145 | ||
fe729a57 | 146 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 147 | { |
0ad8b480 MT |
148 | vhost_net_ubuf_put(ubufs); |
149 | wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); | |
c38e39c3 MT |
150 | } |
151 | ||
152 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
153 | { | |
154 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
155 | kfree(ubufs); |
156 | } | |
157 | ||
b1ad8496 AH |
158 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
159 | { | |
b1ad8496 AH |
160 | int i; |
161 | ||
288cfe78 MT |
162 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
163 | kfree(n->vqs[i].ubuf_info); | |
164 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
165 | } |
166 | } | |
167 | ||
0a1febf7 | 168 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
169 | { |
170 | bool zcopy; | |
171 | int i; | |
172 | ||
288cfe78 | 173 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 174 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
175 | if (!zcopy) |
176 | continue; | |
177 | n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * | |
178 | UIO_MAXIOV, GFP_KERNEL); | |
179 | if (!n->vqs[i].ubuf_info) | |
180 | goto err; | |
181 | } | |
182 | return 0; | |
183 | ||
184 | err: | |
288cfe78 | 185 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
186 | return -ENOMEM; |
187 | } | |
188 | ||
0a1febf7 | 189 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
190 | { |
191 | int i; | |
192 | ||
288cfe78 MT |
193 | vhost_net_clear_ubuf_info(n); |
194 | ||
2839400f AH |
195 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
196 | n->vqs[i].done_idx = 0; | |
197 | n->vqs[i].upend_idx = 0; | |
198 | n->vqs[i].ubufs = NULL; | |
81f95a55 MT |
199 | n->vqs[i].vhost_hlen = 0; |
200 | n->vqs[i].sock_hlen = 0; | |
2839400f AH |
201 | } |
202 | ||
203 | } | |
204 | ||
eaae8132 MT |
205 | static void vhost_net_tx_packet(struct vhost_net *net) |
206 | { | |
207 | ++net->tx_packets; | |
208 | if (net->tx_packets < 1024) | |
209 | return; | |
210 | net->tx_packets = 0; | |
211 | net->tx_zcopy_err = 0; | |
212 | } | |
213 | ||
214 | static void vhost_net_tx_err(struct vhost_net *net) | |
215 | { | |
216 | ++net->tx_zcopy_err; | |
217 | } | |
218 | ||
219 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
220 | { | |
1280c27f MT |
221 | /* TX flush waits for outstanding DMAs to be done. |
222 | * Don't start new DMAs. | |
223 | */ | |
224 | return !net->tx_flush && | |
225 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
226 | } |
227 | ||
bab632d6 MT |
228 | static bool vhost_sock_zcopy(struct socket *sock) |
229 | { | |
230 | return unlikely(experimental_zcopytx) && | |
231 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
232 | } | |
233 | ||
b211616d MT |
234 | /* In case of DMA done not in order in lower device driver for some reason. |
235 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
236 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
237 | * guest used idx. | |
238 | */ | |
094afe7d JW |
239 | static void vhost_zerocopy_signal_used(struct vhost_net *net, |
240 | struct vhost_virtqueue *vq) | |
b211616d | 241 | { |
2839400f AH |
242 | struct vhost_net_virtqueue *nvq = |
243 | container_of(vq, struct vhost_net_virtqueue, vq); | |
c92112ae | 244 | int i, add; |
b211616d MT |
245 | int j = 0; |
246 | ||
2839400f | 247 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
248 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
249 | vhost_net_tx_err(net); | |
b211616d MT |
250 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
251 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
b211616d MT |
252 | ++j; |
253 | } else | |
254 | break; | |
255 | } | |
c92112ae JW |
256 | while (j) { |
257 | add = min(UIO_MAXIOV - nvq->done_idx, j); | |
258 | vhost_add_used_and_signal_n(vq->dev, vq, | |
259 | &vq->heads[nvq->done_idx], add); | |
260 | nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; | |
261 | j -= add; | |
262 | } | |
b211616d MT |
263 | } |
264 | ||
eaae8132 | 265 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 266 | { |
fe729a57 | 267 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 268 | struct vhost_virtqueue *vq = ubufs->vq; |
0ad8b480 | 269 | int cnt; |
24eb21a1 | 270 | |
b0c057ca MT |
271 | rcu_read_lock_bh(); |
272 | ||
19c73b3e JW |
273 | /* set len to mark this desc buffers done DMA */ |
274 | vq->heads[ubuf->desc].len = success ? | |
275 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
0ad8b480 | 276 | cnt = vhost_net_ubuf_put(ubufs); |
19c73b3e | 277 | |
24eb21a1 MT |
278 | /* |
279 | * Trigger polling thread if guest stopped submitting new buffers: | |
0ad8b480 | 280 | * in this case, the refcount after decrement will eventually reach 1. |
24eb21a1 MT |
281 | * We also trigger polling periodically after each 16 packets |
282 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
283 | * less than 10% of times). | |
284 | */ | |
0ad8b480 | 285 | if (cnt <= 1 || !(cnt % 16)) |
24eb21a1 | 286 | vhost_poll_queue(&vq->poll); |
b0c057ca MT |
287 | |
288 | rcu_read_unlock_bh(); | |
b211616d MT |
289 | } |
290 | ||
03088137 JW |
291 | static inline unsigned long busy_clock(void) |
292 | { | |
293 | return local_clock() >> 10; | |
294 | } | |
295 | ||
296 | static bool vhost_can_busy_poll(struct vhost_dev *dev, | |
297 | unsigned long endtime) | |
298 | { | |
299 | return likely(!need_resched()) && | |
300 | likely(!time_after(busy_clock(), endtime)) && | |
301 | likely(!signal_pending(current)) && | |
302 | !vhost_has_work(dev); | |
303 | } | |
304 | ||
8241a1e4 JW |
305 | static void vhost_net_disable_vq(struct vhost_net *n, |
306 | struct vhost_virtqueue *vq) | |
307 | { | |
308 | struct vhost_net_virtqueue *nvq = | |
309 | container_of(vq, struct vhost_net_virtqueue, vq); | |
310 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
311 | if (!vq->private_data) | |
312 | return; | |
313 | vhost_poll_stop(poll); | |
314 | } | |
315 | ||
316 | static int vhost_net_enable_vq(struct vhost_net *n, | |
317 | struct vhost_virtqueue *vq) | |
318 | { | |
319 | struct vhost_net_virtqueue *nvq = | |
320 | container_of(vq, struct vhost_net_virtqueue, vq); | |
321 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
322 | struct socket *sock; | |
323 | ||
324 | sock = vq->private_data; | |
325 | if (!sock) | |
326 | return 0; | |
327 | ||
328 | return vhost_poll_start(poll, sock->file); | |
329 | } | |
330 | ||
03088137 JW |
331 | static int vhost_net_tx_get_vq_desc(struct vhost_net *net, |
332 | struct vhost_virtqueue *vq, | |
333 | struct iovec iov[], unsigned int iov_size, | |
334 | unsigned int *out_num, unsigned int *in_num) | |
335 | { | |
336 | unsigned long uninitialized_var(endtime); | |
337 | int r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 338 | out_num, in_num, NULL, NULL); |
03088137 JW |
339 | |
340 | if (r == vq->num && vq->busyloop_timeout) { | |
341 | preempt_disable(); | |
342 | endtime = busy_clock() + vq->busyloop_timeout; | |
343 | while (vhost_can_busy_poll(vq->dev, endtime) && | |
344 | vhost_vq_avail_empty(vq->dev, vq)) | |
345 | cpu_relax_lowlatency(); | |
346 | preempt_enable(); | |
347 | r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 348 | out_num, in_num, NULL, NULL); |
03088137 JW |
349 | } |
350 | ||
351 | return r; | |
352 | } | |
353 | ||
3a4d5c94 MT |
354 | /* Expects to be always run from workqueue - which acts as |
355 | * read-size critical section for our kind of RCU. */ | |
356 | static void handle_tx(struct vhost_net *net) | |
357 | { | |
2839400f | 358 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 359 | struct vhost_virtqueue *vq = &nvq->vq; |
98a527aa | 360 | unsigned out, in; |
d5675bd2 | 361 | int head; |
3a4d5c94 MT |
362 | struct msghdr msg = { |
363 | .msg_name = NULL, | |
364 | .msg_namelen = 0, | |
365 | .msg_control = NULL, | |
366 | .msg_controllen = 0, | |
3a4d5c94 MT |
367 | .msg_flags = MSG_DONTWAIT, |
368 | }; | |
369 | size_t len, total_len = 0; | |
70181d51 | 370 | int err; |
3a4d5c94 | 371 | size_t hdr_size; |
28457ee6 | 372 | struct socket *sock; |
fe729a57 | 373 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 374 | bool zcopy, zcopy_used; |
28457ee6 | 375 | |
2e26af79 AH |
376 | mutex_lock(&vq->mutex); |
377 | sock = vq->private_data; | |
3a4d5c94 | 378 | if (!sock) |
2e26af79 | 379 | goto out; |
3a4d5c94 | 380 | |
6b1e6cc7 JW |
381 | if (!vq_iotlb_prefetch(vq)) |
382 | goto out; | |
383 | ||
8ea8cf89 | 384 | vhost_disable_notify(&net->dev, vq); |
3a4d5c94 | 385 | |
81f95a55 | 386 | hdr_size = nvq->vhost_hlen; |
2839400f | 387 | zcopy = nvq->ubufs; |
3a4d5c94 MT |
388 | |
389 | for (;;) { | |
bab632d6 MT |
390 | /* Release DMAs done buffers first */ |
391 | if (zcopy) | |
eaae8132 | 392 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 393 | |
f7c6be40 JW |
394 | /* If more outstanding DMAs, queue the work. |
395 | * Handle upend_idx wrap around | |
396 | */ | |
397 | if (unlikely((nvq->upend_idx + vq->num - VHOST_MAX_PEND) | |
398 | % UIO_MAXIOV == nvq->done_idx)) | |
399 | break; | |
400 | ||
03088137 JW |
401 | head = vhost_net_tx_get_vq_desc(net, vq, vq->iov, |
402 | ARRAY_SIZE(vq->iov), | |
403 | &out, &in); | |
d5675bd2 | 404 | /* On error, stop handling until the next kick. */ |
7b3384fc | 405 | if (unlikely(head < 0)) |
d5675bd2 | 406 | break; |
3a4d5c94 MT |
407 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
408 | if (head == vq->num) { | |
8ea8cf89 MT |
409 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
410 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
411 | continue; |
412 | } | |
413 | break; | |
414 | } | |
415 | if (in) { | |
416 | vq_err(vq, "Unexpected descriptor format for TX: " | |
417 | "out %d, int %d\n", out, in); | |
418 | break; | |
419 | } | |
420 | /* Skip header. TODO: support TSO. */ | |
3a4d5c94 | 421 | len = iov_length(vq->iov, out); |
c0371da6 | 422 | iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len); |
98a527aa | 423 | iov_iter_advance(&msg.msg_iter, hdr_size); |
3a4d5c94 | 424 | /* Sanity check */ |
01e97e65 | 425 | if (!msg_data_left(&msg)) { |
3a4d5c94 MT |
426 | vq_err(vq, "Unexpected header len for TX: " |
427 | "%zd expected %zd\n", | |
98a527aa | 428 | len, hdr_size); |
3a4d5c94 MT |
429 | break; |
430 | } | |
01e97e65 | 431 | len = msg_data_left(&msg); |
ce21a029 JW |
432 | |
433 | zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN | |
434 | && (nvq->upend_idx + 1) % UIO_MAXIOV != | |
435 | nvq->done_idx | |
436 | && vhost_net_tx_select_zcopy(net); | |
cedb9bdc | 437 | |
bab632d6 | 438 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 439 | if (zcopy_used) { |
ce21a029 JW |
440 | struct ubuf_info *ubuf; |
441 | ubuf = nvq->ubuf_info + nvq->upend_idx; | |
442 | ||
8b38694a | 443 | vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); |
ce21a029 JW |
444 | vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; |
445 | ubuf->callback = vhost_zerocopy_callback; | |
446 | ubuf->ctx = nvq->ubufs; | |
447 | ubuf->desc = nvq->upend_idx; | |
448 | msg.msg_control = ubuf; | |
449 | msg.msg_controllen = sizeof(ubuf); | |
450 | ubufs = nvq->ubufs; | |
0ad8b480 | 451 | atomic_inc(&ubufs->refcount); |
2839400f | 452 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
ce21a029 | 453 | } else { |
4364d5f9 | 454 | msg.msg_control = NULL; |
ce21a029 JW |
455 | ubufs = NULL; |
456 | } | |
3a4d5c94 | 457 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
1b784140 | 458 | err = sock->ops->sendmsg(sock, &msg, len); |
3a4d5c94 | 459 | if (unlikely(err < 0)) { |
cedb9bdc | 460 | if (zcopy_used) { |
ce21a029 | 461 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
462 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
463 | % UIO_MAXIOV; | |
bab632d6 | 464 | } |
8dd014ad | 465 | vhost_discard_vq_desc(vq, 1); |
3a4d5c94 MT |
466 | break; |
467 | } | |
468 | if (err != len) | |
95c0ec6a MT |
469 | pr_debug("Truncated TX packet: " |
470 | " len %d != %zd\n", err, len); | |
cedb9bdc | 471 | if (!zcopy_used) |
bab632d6 | 472 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 473 | else |
eaae8132 | 474 | vhost_zerocopy_signal_used(net, vq); |
3a4d5c94 | 475 | total_len += len; |
eaae8132 | 476 | vhost_net_tx_packet(net); |
3a4d5c94 MT |
477 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { |
478 | vhost_poll_queue(&vq->poll); | |
479 | break; | |
480 | } | |
481 | } | |
2e26af79 | 482 | out: |
3a4d5c94 | 483 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
484 | } |
485 | ||
8dd014ad DS |
486 | static int peek_head_len(struct sock *sk) |
487 | { | |
1576d986 | 488 | struct socket *sock = sk->sk_socket; |
8dd014ad DS |
489 | struct sk_buff *head; |
490 | int len = 0; | |
783e3988 | 491 | unsigned long flags; |
8dd014ad | 492 | |
1576d986 JW |
493 | if (sock->ops->peek_len) |
494 | return sock->ops->peek_len(sock); | |
495 | ||
783e3988 | 496 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 497 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 498 | if (likely(head)) { |
8dd014ad | 499 | len = head->len; |
df8a39de | 500 | if (skb_vlan_tag_present(head)) |
c53cff5e BG |
501 | len += VLAN_HLEN; |
502 | } | |
503 | ||
783e3988 | 504 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
505 | return len; |
506 | } | |
507 | ||
1576d986 JW |
508 | static int sk_has_rx_data(struct sock *sk) |
509 | { | |
510 | struct socket *sock = sk->sk_socket; | |
511 | ||
512 | if (sock->ops->peek_len) | |
513 | return sock->ops->peek_len(sock); | |
514 | ||
515 | return skb_queue_empty(&sk->sk_receive_queue); | |
516 | } | |
517 | ||
03088137 JW |
518 | static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk) |
519 | { | |
520 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
521 | struct vhost_virtqueue *vq = &nvq->vq; | |
522 | unsigned long uninitialized_var(endtime); | |
523 | int len = peek_head_len(sk); | |
524 | ||
525 | if (!len && vq->busyloop_timeout) { | |
526 | /* Both tx vq and rx socket were polled here */ | |
527 | mutex_lock(&vq->mutex); | |
528 | vhost_disable_notify(&net->dev, vq); | |
529 | ||
530 | preempt_disable(); | |
531 | endtime = busy_clock() + vq->busyloop_timeout; | |
532 | ||
533 | while (vhost_can_busy_poll(&net->dev, endtime) && | |
1576d986 | 534 | !sk_has_rx_data(sk) && |
03088137 JW |
535 | vhost_vq_avail_empty(&net->dev, vq)) |
536 | cpu_relax_lowlatency(); | |
537 | ||
538 | preempt_enable(); | |
539 | ||
540 | if (vhost_enable_notify(&net->dev, vq)) | |
541 | vhost_poll_queue(&vq->poll); | |
542 | mutex_unlock(&vq->mutex); | |
543 | ||
544 | len = peek_head_len(sk); | |
545 | } | |
546 | ||
547 | return len; | |
548 | } | |
549 | ||
8dd014ad DS |
550 | /* This is a multi-buffer version of vhost_get_desc, that works if |
551 | * vq has read descriptors only. | |
552 | * @vq - the relevant virtqueue | |
553 | * @datalen - data length we'll be reading | |
554 | * @iovcount - returned count of io vectors we fill | |
555 | * @log - vhost log | |
556 | * @log_num - log offset | |
94249369 | 557 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
558 | * returns number of buffer heads allocated, negative on error |
559 | */ | |
560 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
561 | struct vring_used_elem *heads, | |
562 | int datalen, | |
563 | unsigned *iovcount, | |
564 | struct vhost_log *log, | |
94249369 JW |
565 | unsigned *log_num, |
566 | unsigned int quota) | |
8dd014ad DS |
567 | { |
568 | unsigned int out, in; | |
569 | int seg = 0; | |
570 | int headcount = 0; | |
571 | unsigned d; | |
572 | int r, nlogs = 0; | |
8b38694a MT |
573 | /* len is always initialized before use since we are always called with |
574 | * datalen > 0. | |
575 | */ | |
576 | u32 uninitialized_var(len); | |
8dd014ad | 577 | |
94249369 | 578 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 579 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
580 | r = -ENOBUFS; |
581 | goto err; | |
582 | } | |
47283bef | 583 | r = vhost_get_vq_desc(vq, vq->iov + seg, |
8dd014ad DS |
584 | ARRAY_SIZE(vq->iov) - seg, &out, |
585 | &in, log, log_num); | |
a39ee449 MT |
586 | if (unlikely(r < 0)) |
587 | goto err; | |
588 | ||
589 | d = r; | |
8dd014ad DS |
590 | if (d == vq->num) { |
591 | r = 0; | |
592 | goto err; | |
593 | } | |
594 | if (unlikely(out || in <= 0)) { | |
595 | vq_err(vq, "unexpected descriptor format for RX: " | |
596 | "out %d, in %d\n", out, in); | |
597 | r = -EINVAL; | |
598 | goto err; | |
599 | } | |
600 | if (unlikely(log)) { | |
601 | nlogs += *log_num; | |
602 | log += *log_num; | |
603 | } | |
8b38694a MT |
604 | heads[headcount].id = cpu_to_vhost32(vq, d); |
605 | len = iov_length(vq->iov + seg, in); | |
606 | heads[headcount].len = cpu_to_vhost32(vq, len); | |
607 | datalen -= len; | |
8dd014ad DS |
608 | ++headcount; |
609 | seg += in; | |
610 | } | |
99975cc6 | 611 | heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); |
8dd014ad DS |
612 | *iovcount = seg; |
613 | if (unlikely(log)) | |
614 | *log_num = nlogs; | |
d8316f39 MT |
615 | |
616 | /* Detect overrun */ | |
617 | if (unlikely(datalen > 0)) { | |
618 | r = UIO_MAXIOV + 1; | |
619 | goto err; | |
620 | } | |
8dd014ad DS |
621 | return headcount; |
622 | err: | |
623 | vhost_discard_vq_desc(vq, headcount); | |
624 | return r; | |
625 | } | |
626 | ||
3a4d5c94 MT |
627 | /* Expects to be always run from workqueue - which acts as |
628 | * read-size critical section for our kind of RCU. */ | |
94249369 | 629 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 630 | { |
81f95a55 MT |
631 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
632 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
633 | unsigned uninitialized_var(in), log; |
634 | struct vhost_log *vq_log; | |
635 | struct msghdr msg = { | |
636 | .msg_name = NULL, | |
637 | .msg_namelen = 0, | |
638 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
639 | .msg_controllen = 0, | |
8dd014ad DS |
640 | .msg_flags = MSG_DONTWAIT, |
641 | }; | |
0960b641 JW |
642 | struct virtio_net_hdr hdr = { |
643 | .flags = 0, | |
644 | .gso_type = VIRTIO_NET_HDR_GSO_NONE | |
8dd014ad | 645 | }; |
8dd014ad | 646 | size_t total_len = 0; |
910a578f MT |
647 | int err, mergeable; |
648 | s16 headcount; | |
8dd014ad DS |
649 | size_t vhost_hlen, sock_hlen; |
650 | size_t vhost_len, sock_len; | |
2e26af79 | 651 | struct socket *sock; |
ba7438ae | 652 | struct iov_iter fixup; |
0960b641 | 653 | __virtio16 num_buffers; |
8dd014ad | 654 | |
8dd014ad | 655 | mutex_lock(&vq->mutex); |
2e26af79 AH |
656 | sock = vq->private_data; |
657 | if (!sock) | |
658 | goto out; | |
6b1e6cc7 JW |
659 | |
660 | if (!vq_iotlb_prefetch(vq)) | |
661 | goto out; | |
662 | ||
8ea8cf89 | 663 | vhost_disable_notify(&net->dev, vq); |
8241a1e4 | 664 | vhost_net_disable_vq(net, vq); |
2e26af79 | 665 | |
81f95a55 MT |
666 | vhost_hlen = nvq->vhost_hlen; |
667 | sock_hlen = nvq->sock_hlen; | |
8dd014ad | 668 | |
ea16c514 | 669 | vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ? |
8dd014ad | 670 | vq->log : NULL; |
ea16c514 | 671 | mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad | 672 | |
03088137 | 673 | while ((sock_len = vhost_net_rx_peek_head_len(net, sock->sk))) { |
8dd014ad DS |
674 | sock_len += sock_hlen; |
675 | vhost_len = sock_len + vhost_hlen; | |
676 | headcount = get_rx_bufs(vq, vq->heads, vhost_len, | |
94249369 JW |
677 | &in, vq_log, &log, |
678 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
679 | /* On error, stop handling until the next kick. */ |
680 | if (unlikely(headcount < 0)) | |
8241a1e4 | 681 | goto out; |
d8316f39 MT |
682 | /* On overrun, truncate and discard */ |
683 | if (unlikely(headcount > UIO_MAXIOV)) { | |
c0371da6 | 684 | iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); |
1b784140 | 685 | err = sock->ops->recvmsg(sock, &msg, |
d8316f39 MT |
686 | 1, MSG_DONTWAIT | MSG_TRUNC); |
687 | pr_debug("Discarded rx packet: len %zd\n", sock_len); | |
688 | continue; | |
689 | } | |
8dd014ad DS |
690 | /* OK, now we need to know about added descriptors. */ |
691 | if (!headcount) { | |
8ea8cf89 | 692 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
693 | /* They have slipped one in as we were |
694 | * doing that: check again. */ | |
8ea8cf89 | 695 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
696 | continue; |
697 | } | |
698 | /* Nothing new? Wait for eventfd to tell us | |
699 | * they refilled. */ | |
8241a1e4 | 700 | goto out; |
8dd014ad DS |
701 | } |
702 | /* We don't need to be notified again. */ | |
ba7438ae AV |
703 | iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len); |
704 | fixup = msg.msg_iter; | |
705 | if (unlikely((vhost_hlen))) { | |
706 | /* We will supply the header ourselves | |
707 | * TODO: support TSO. | |
708 | */ | |
709 | iov_iter_advance(&msg.msg_iter, vhost_hlen); | |
ba7438ae | 710 | } |
1b784140 | 711 | err = sock->ops->recvmsg(sock, &msg, |
8dd014ad DS |
712 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
713 | /* Userspace might have consumed the packet meanwhile: | |
714 | * it's not supposed to do this usually, but might be hard | |
715 | * to prevent. Discard data we got (if any) and keep going. */ | |
716 | if (unlikely(err != sock_len)) { | |
717 | pr_debug("Discarded rx packet: " | |
718 | " len %d, expected %zd\n", err, sock_len); | |
719 | vhost_discard_vq_desc(vq, headcount); | |
720 | continue; | |
721 | } | |
ba7438ae | 722 | /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ |
4c5a8442 MT |
723 | if (unlikely(vhost_hlen)) { |
724 | if (copy_to_iter(&hdr, sizeof(hdr), | |
725 | &fixup) != sizeof(hdr)) { | |
726 | vq_err(vq, "Unable to write vnet_hdr " | |
727 | "at addr %p\n", vq->iov->iov_base); | |
8241a1e4 | 728 | goto out; |
4c5a8442 MT |
729 | } |
730 | } else { | |
731 | /* Header came from socket; we'll need to patch | |
732 | * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF | |
733 | */ | |
734 | iov_iter_advance(&fixup, sizeof(hdr)); | |
8dd014ad DS |
735 | } |
736 | /* TODO: Should check and handle checksum. */ | |
5201aa49 | 737 | |
0960b641 | 738 | num_buffers = cpu_to_vhost16(vq, headcount); |
cfbdab95 | 739 | if (likely(mergeable) && |
0d79a493 MT |
740 | copy_to_iter(&num_buffers, sizeof num_buffers, |
741 | &fixup) != sizeof num_buffers) { | |
8dd014ad DS |
742 | vq_err(vq, "Failed num_buffers write"); |
743 | vhost_discard_vq_desc(vq, headcount); | |
8241a1e4 | 744 | goto out; |
8dd014ad DS |
745 | } |
746 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
747 | headcount); | |
748 | if (unlikely(vq_log)) | |
749 | vhost_log_write(vq, vq_log, log, vhost_len); | |
750 | total_len += vhost_len; | |
751 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
752 | vhost_poll_queue(&vq->poll); | |
8241a1e4 | 753 | goto out; |
8dd014ad DS |
754 | } |
755 | } | |
8241a1e4 | 756 | vhost_net_enable_vq(net, vq); |
2e26af79 | 757 | out: |
8dd014ad | 758 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
759 | } |
760 | ||
c23f3445 | 761 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 762 | { |
c23f3445 TH |
763 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
764 | poll.work); | |
765 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
766 | ||
3a4d5c94 MT |
767 | handle_tx(net); |
768 | } | |
769 | ||
c23f3445 | 770 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 771 | { |
c23f3445 TH |
772 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
773 | poll.work); | |
774 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
775 | ||
3a4d5c94 MT |
776 | handle_rx(net); |
777 | } | |
778 | ||
c23f3445 | 779 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 780 | { |
c23f3445 TH |
781 | struct vhost_net *net = container_of(work, struct vhost_net, |
782 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
783 | handle_tx(net); |
784 | } | |
785 | ||
c23f3445 | 786 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 787 | { |
c23f3445 TH |
788 | struct vhost_net *net = container_of(work, struct vhost_net, |
789 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
790 | handle_rx(net); |
791 | } | |
792 | ||
793 | static int vhost_net_open(struct inode *inode, struct file *f) | |
794 | { | |
23cc5a99 | 795 | struct vhost_net *n; |
c23f3445 | 796 | struct vhost_dev *dev; |
3ab2e420 | 797 | struct vhost_virtqueue **vqs; |
59566b6e | 798 | int i; |
c23f3445 | 799 | |
23cc5a99 MT |
800 | n = kmalloc(sizeof *n, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); |
801 | if (!n) { | |
802 | n = vmalloc(sizeof *n); | |
803 | if (!n) | |
804 | return -ENOMEM; | |
805 | } | |
3ab2e420 AH |
806 | vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
807 | if (!vqs) { | |
d04257b0 | 808 | kvfree(n); |
3ab2e420 AH |
809 | return -ENOMEM; |
810 | } | |
c23f3445 TH |
811 | |
812 | dev = &n->dev; | |
3ab2e420 AH |
813 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
814 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
815 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
816 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
817 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
818 | n->vqs[i].ubufs = NULL; | |
819 | n->vqs[i].ubuf_info = NULL; | |
820 | n->vqs[i].upend_idx = 0; | |
821 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
822 | n->vqs[i].vhost_hlen = 0; |
823 | n->vqs[i].sock_hlen = 0; | |
2839400f | 824 | } |
59566b6e | 825 | vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 | 826 | |
c23f3445 TH |
827 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev); |
828 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev); | |
3a4d5c94 MT |
829 | |
830 | f->private_data = n; | |
831 | ||
832 | return 0; | |
833 | } | |
834 | ||
3a4d5c94 MT |
835 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, |
836 | struct vhost_virtqueue *vq) | |
837 | { | |
838 | struct socket *sock; | |
839 | ||
840 | mutex_lock(&vq->mutex); | |
22fa90c7 | 841 | sock = vq->private_data; |
3a4d5c94 | 842 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 843 | vq->private_data = NULL; |
3a4d5c94 MT |
844 | mutex_unlock(&vq->mutex); |
845 | return sock; | |
846 | } | |
847 | ||
848 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
849 | struct socket **rx_sock) | |
850 | { | |
3ab2e420 AH |
851 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
852 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
853 | } |
854 | ||
855 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
856 | { | |
857 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 858 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
859 | } |
860 | ||
861 | static void vhost_net_flush(struct vhost_net *n) | |
862 | { | |
863 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
864 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 865 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 866 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 867 | n->tx_flush = true; |
3ab2e420 | 868 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 869 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 870 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 871 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 872 | n->tx_flush = false; |
0ad8b480 | 873 | atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); |
3ab2e420 | 874 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 875 | } |
3a4d5c94 MT |
876 | } |
877 | ||
878 | static int vhost_net_release(struct inode *inode, struct file *f) | |
879 | { | |
880 | struct vhost_net *n = f->private_data; | |
881 | struct socket *tx_sock; | |
882 | struct socket *rx_sock; | |
883 | ||
884 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
885 | vhost_net_flush(n); | |
b211616d | 886 | vhost_dev_stop(&n->dev); |
ea5d4046 | 887 | vhost_dev_cleanup(&n->dev, false); |
81f95a55 | 888 | vhost_net_vq_reset(n); |
3a4d5c94 | 889 | if (tx_sock) |
09aaacf0 | 890 | sockfd_put(tx_sock); |
3a4d5c94 | 891 | if (rx_sock) |
09aaacf0 | 892 | sockfd_put(rx_sock); |
b0c057ca MT |
893 | /* Make sure no callbacks are outstanding */ |
894 | synchronize_rcu_bh(); | |
3a4d5c94 MT |
895 | /* We do an extra flush before freeing memory, |
896 | * since jobs can re-queue themselves. */ | |
897 | vhost_net_flush(n); | |
3ab2e420 | 898 | kfree(n->dev.vqs); |
d04257b0 | 899 | kvfree(n); |
3a4d5c94 MT |
900 | return 0; |
901 | } | |
902 | ||
903 | static struct socket *get_raw_socket(int fd) | |
904 | { | |
905 | struct { | |
906 | struct sockaddr_ll sa; | |
907 | char buf[MAX_ADDR_LEN]; | |
908 | } uaddr; | |
909 | int uaddr_len = sizeof uaddr, r; | |
910 | struct socket *sock = sockfd_lookup(fd, &r); | |
d47effe1 | 911 | |
3a4d5c94 MT |
912 | if (!sock) |
913 | return ERR_PTR(-ENOTSOCK); | |
914 | ||
915 | /* Parameter checking */ | |
916 | if (sock->sk->sk_type != SOCK_RAW) { | |
917 | r = -ESOCKTNOSUPPORT; | |
918 | goto err; | |
919 | } | |
920 | ||
921 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, | |
922 | &uaddr_len, 0); | |
923 | if (r) | |
924 | goto err; | |
925 | ||
926 | if (uaddr.sa.sll_family != AF_PACKET) { | |
927 | r = -EPFNOSUPPORT; | |
928 | goto err; | |
929 | } | |
930 | return sock; | |
931 | err: | |
09aaacf0 | 932 | sockfd_put(sock); |
3a4d5c94 MT |
933 | return ERR_PTR(r); |
934 | } | |
935 | ||
501c774c | 936 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
937 | { |
938 | struct file *file = fget(fd); | |
939 | struct socket *sock; | |
d47effe1 | 940 | |
3a4d5c94 MT |
941 | if (!file) |
942 | return ERR_PTR(-EBADF); | |
943 | sock = tun_get_socket(file); | |
501c774c AB |
944 | if (!IS_ERR(sock)) |
945 | return sock; | |
946 | sock = macvtap_get_socket(file); | |
3a4d5c94 MT |
947 | if (IS_ERR(sock)) |
948 | fput(file); | |
949 | return sock; | |
950 | } | |
951 | ||
952 | static struct socket *get_socket(int fd) | |
953 | { | |
954 | struct socket *sock; | |
d47effe1 | 955 | |
3a4d5c94 MT |
956 | /* special case to disable backend */ |
957 | if (fd == -1) | |
958 | return NULL; | |
959 | sock = get_raw_socket(fd); | |
960 | if (!IS_ERR(sock)) | |
961 | return sock; | |
501c774c | 962 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
963 | if (!IS_ERR(sock)) |
964 | return sock; | |
965 | return ERR_PTR(-ENOTSOCK); | |
966 | } | |
967 | ||
968 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
969 | { | |
970 | struct socket *sock, *oldsock; | |
971 | struct vhost_virtqueue *vq; | |
2839400f | 972 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 973 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
974 | int r; |
975 | ||
976 | mutex_lock(&n->dev.mutex); | |
977 | r = vhost_dev_check_owner(&n->dev); | |
978 | if (r) | |
979 | goto err; | |
980 | ||
981 | if (index >= VHOST_NET_VQ_MAX) { | |
982 | r = -ENOBUFS; | |
983 | goto err; | |
984 | } | |
3ab2e420 | 985 | vq = &n->vqs[index].vq; |
2839400f | 986 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
987 | mutex_lock(&vq->mutex); |
988 | ||
989 | /* Verify that ring has been setup correctly. */ | |
990 | if (!vhost_vq_access_ok(vq)) { | |
991 | r = -EFAULT; | |
1dace8c8 | 992 | goto err_vq; |
3a4d5c94 MT |
993 | } |
994 | sock = get_socket(fd); | |
995 | if (IS_ERR(sock)) { | |
996 | r = PTR_ERR(sock); | |
1dace8c8 | 997 | goto err_vq; |
3a4d5c94 MT |
998 | } |
999 | ||
1000 | /* start polling new socket */ | |
22fa90c7 | 1001 | oldsock = vq->private_data; |
11fe8839 | 1002 | if (sock != oldsock) { |
fe729a57 AH |
1003 | ubufs = vhost_net_ubuf_alloc(vq, |
1004 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
1005 | if (IS_ERR(ubufs)) { |
1006 | r = PTR_ERR(ubufs); | |
1007 | goto err_ubufs; | |
1008 | } | |
692a998b | 1009 | |
d47effe1 | 1010 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 1011 | vq->private_data = sock; |
80f7d030 | 1012 | r = vhost_vq_init_access(vq); |
f59281da | 1013 | if (r) |
692a998b | 1014 | goto err_used; |
2b8b328b JW |
1015 | r = vhost_net_enable_vq(n, vq); |
1016 | if (r) | |
1017 | goto err_used; | |
692a998b | 1018 | |
2839400f AH |
1019 | oldubufs = nvq->ubufs; |
1020 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
1021 | |
1022 | n->tx_packets = 0; | |
1023 | n->tx_zcopy_err = 0; | |
1280c27f | 1024 | n->tx_flush = false; |
dd1f4078 | 1025 | } |
3a4d5c94 | 1026 | |
1680e906 MT |
1027 | mutex_unlock(&vq->mutex); |
1028 | ||
c047e5f3 | 1029 | if (oldubufs) { |
c38e39c3 | 1030 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 1031 | mutex_lock(&vq->mutex); |
eaae8132 | 1032 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
1033 | mutex_unlock(&vq->mutex); |
1034 | } | |
bab632d6 | 1035 | |
3a4d5c94 MT |
1036 | if (oldsock) { |
1037 | vhost_net_flush_vq(n, index); | |
09aaacf0 | 1038 | sockfd_put(oldsock); |
3a4d5c94 | 1039 | } |
1dace8c8 | 1040 | |
1680e906 MT |
1041 | mutex_unlock(&n->dev.mutex); |
1042 | return 0; | |
1043 | ||
692a998b | 1044 | err_used: |
22fa90c7 | 1045 | vq->private_data = oldsock; |
692a998b JW |
1046 | vhost_net_enable_vq(n, vq); |
1047 | if (ubufs) | |
c38e39c3 | 1048 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 | 1049 | err_ubufs: |
09aaacf0 | 1050 | sockfd_put(sock); |
1dace8c8 JD |
1051 | err_vq: |
1052 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
1053 | err: |
1054 | mutex_unlock(&n->dev.mutex); | |
1055 | return r; | |
1056 | } | |
1057 | ||
1058 | static long vhost_net_reset_owner(struct vhost_net *n) | |
1059 | { | |
1060 | struct socket *tx_sock = NULL; | |
1061 | struct socket *rx_sock = NULL; | |
1062 | long err; | |
a9709d68 | 1063 | struct vhost_umem *umem; |
d47effe1 | 1064 | |
3a4d5c94 MT |
1065 | mutex_lock(&n->dev.mutex); |
1066 | err = vhost_dev_check_owner(&n->dev); | |
1067 | if (err) | |
1068 | goto done; | |
a9709d68 JW |
1069 | umem = vhost_dev_reset_owner_prepare(); |
1070 | if (!umem) { | |
150b9e51 MT |
1071 | err = -ENOMEM; |
1072 | goto done; | |
1073 | } | |
3a4d5c94 MT |
1074 | vhost_net_stop(n, &tx_sock, &rx_sock); |
1075 | vhost_net_flush(n); | |
a9709d68 | 1076 | vhost_dev_reset_owner(&n->dev, umem); |
81f95a55 | 1077 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
1078 | done: |
1079 | mutex_unlock(&n->dev.mutex); | |
1080 | if (tx_sock) | |
09aaacf0 | 1081 | sockfd_put(tx_sock); |
3a4d5c94 | 1082 | if (rx_sock) |
09aaacf0 | 1083 | sockfd_put(rx_sock); |
3a4d5c94 MT |
1084 | return err; |
1085 | } | |
1086 | ||
1087 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
1088 | { | |
8dd014ad | 1089 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1090 | int i; |
8dd014ad | 1091 | |
e4fca7d6 MT |
1092 | hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
1093 | (1ULL << VIRTIO_F_VERSION_1))) ? | |
8dd014ad DS |
1094 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
1095 | sizeof(struct virtio_net_hdr); | |
1096 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1097 | /* vhost provides vnet_hdr */ | |
1098 | vhost_hlen = hdr_len; | |
1099 | sock_hlen = 0; | |
1100 | } else { | |
1101 | /* socket provides vnet_hdr */ | |
1102 | vhost_hlen = 0; | |
1103 | sock_hlen = hdr_len; | |
1104 | } | |
3a4d5c94 MT |
1105 | mutex_lock(&n->dev.mutex); |
1106 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
6b1e6cc7 JW |
1107 | !vhost_log_access_ok(&n->dev)) |
1108 | goto out_unlock; | |
1109 | ||
1110 | if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) { | |
1111 | if (vhost_init_device_iotlb(&n->dev, true)) | |
1112 | goto out_unlock; | |
3a4d5c94 | 1113 | } |
6b1e6cc7 | 1114 | |
3a4d5c94 | 1115 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
3ab2e420 | 1116 | mutex_lock(&n->vqs[i].vq.mutex); |
ea16c514 | 1117 | n->vqs[i].vq.acked_features = features; |
81f95a55 MT |
1118 | n->vqs[i].vhost_hlen = vhost_hlen; |
1119 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1120 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 | 1121 | } |
3a4d5c94 MT |
1122 | mutex_unlock(&n->dev.mutex); |
1123 | return 0; | |
6b1e6cc7 JW |
1124 | |
1125 | out_unlock: | |
1126 | mutex_unlock(&n->dev.mutex); | |
1127 | return -EFAULT; | |
3a4d5c94 MT |
1128 | } |
1129 | ||
b1ad8496 AH |
1130 | static long vhost_net_set_owner(struct vhost_net *n) |
1131 | { | |
1132 | int r; | |
1133 | ||
1134 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1135 | if (vhost_dev_has_owner(&n->dev)) { |
1136 | r = -EBUSY; | |
1137 | goto out; | |
1138 | } | |
b1ad8496 AH |
1139 | r = vhost_net_set_ubuf_info(n); |
1140 | if (r) | |
1141 | goto out; | |
1142 | r = vhost_dev_set_owner(&n->dev); | |
1143 | if (r) | |
1144 | vhost_net_clear_ubuf_info(n); | |
1145 | vhost_net_flush(n); | |
1146 | out: | |
1147 | mutex_unlock(&n->dev.mutex); | |
1148 | return r; | |
1149 | } | |
1150 | ||
3a4d5c94 MT |
1151 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1152 | unsigned long arg) | |
1153 | { | |
1154 | struct vhost_net *n = f->private_data; | |
1155 | void __user *argp = (void __user *)arg; | |
1156 | u64 __user *featurep = argp; | |
1157 | struct vhost_vring_file backend; | |
1158 | u64 features; | |
1159 | int r; | |
d47effe1 | 1160 | |
3a4d5c94 MT |
1161 | switch (ioctl) { |
1162 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1163 | if (copy_from_user(&backend, argp, sizeof backend)) |
1164 | return -EFAULT; | |
3a4d5c94 MT |
1165 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1166 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1167 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1168 | if (copy_to_user(featurep, &features, sizeof features)) |
1169 | return -EFAULT; | |
1170 | return 0; | |
3a4d5c94 | 1171 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1172 | if (copy_from_user(&features, featurep, sizeof features)) |
1173 | return -EFAULT; | |
0dd05a3b | 1174 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1175 | return -EOPNOTSUPP; |
1176 | return vhost_net_set_features(n, features); | |
1177 | case VHOST_RESET_OWNER: | |
1178 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1179 | case VHOST_SET_OWNER: |
1180 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1181 | default: |
1182 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1183 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1184 | if (r == -ENOIOCTLCMD) | |
1185 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1186 | else | |
1187 | vhost_net_flush(n); | |
3a4d5c94 MT |
1188 | mutex_unlock(&n->dev.mutex); |
1189 | return r; | |
1190 | } | |
1191 | } | |
1192 | ||
1193 | #ifdef CONFIG_COMPAT | |
1194 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1195 | unsigned long arg) | |
1196 | { | |
1197 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1198 | } | |
1199 | #endif | |
1200 | ||
6b1e6cc7 JW |
1201 | static ssize_t vhost_net_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1202 | { | |
1203 | struct file *file = iocb->ki_filp; | |
1204 | struct vhost_net *n = file->private_data; | |
1205 | struct vhost_dev *dev = &n->dev; | |
1206 | int noblock = file->f_flags & O_NONBLOCK; | |
1207 | ||
1208 | return vhost_chr_read_iter(dev, to, noblock); | |
1209 | } | |
1210 | ||
1211 | static ssize_t vhost_net_chr_write_iter(struct kiocb *iocb, | |
1212 | struct iov_iter *from) | |
1213 | { | |
1214 | struct file *file = iocb->ki_filp; | |
1215 | struct vhost_net *n = file->private_data; | |
1216 | struct vhost_dev *dev = &n->dev; | |
1217 | ||
1218 | return vhost_chr_write_iter(dev, from); | |
1219 | } | |
1220 | ||
1221 | static unsigned int vhost_net_chr_poll(struct file *file, poll_table *wait) | |
1222 | { | |
1223 | struct vhost_net *n = file->private_data; | |
1224 | struct vhost_dev *dev = &n->dev; | |
1225 | ||
1226 | return vhost_chr_poll(file, dev, wait); | |
1227 | } | |
1228 | ||
373a83a6 | 1229 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1230 | .owner = THIS_MODULE, |
1231 | .release = vhost_net_release, | |
6b1e6cc7 JW |
1232 | .read_iter = vhost_net_chr_read_iter, |
1233 | .write_iter = vhost_net_chr_write_iter, | |
1234 | .poll = vhost_net_chr_poll, | |
3a4d5c94 MT |
1235 | .unlocked_ioctl = vhost_net_ioctl, |
1236 | #ifdef CONFIG_COMPAT | |
1237 | .compat_ioctl = vhost_net_compat_ioctl, | |
1238 | #endif | |
1239 | .open = vhost_net_open, | |
6038f373 | 1240 | .llseek = noop_llseek, |
3a4d5c94 MT |
1241 | }; |
1242 | ||
1243 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1244 | .minor = VHOST_NET_MINOR, |
1245 | .name = "vhost-net", | |
1246 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1247 | }; |
1248 | ||
a8d3782f | 1249 | static int vhost_net_init(void) |
3a4d5c94 | 1250 | { |
bab632d6 | 1251 | if (experimental_zcopytx) |
fe729a57 | 1252 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1253 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1254 | } |
1255 | module_init(vhost_net_init); | |
1256 | ||
a8d3782f | 1257 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1258 | { |
1259 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1260 | } |
1261 | module_exit(vhost_net_exit); | |
1262 | ||
1263 | MODULE_VERSION("0.0.1"); | |
1264 | MODULE_LICENSE("GPL v2"); | |
1265 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1266 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1267 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1268 | MODULE_ALIAS("devname:vhost-net"); |