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> |
e6017571 | 20 | #include <linux/sched/clock.h> |
174cd4b1 | 21 | #include <linux/sched/signal.h> |
23cc5a99 | 22 | #include <linux/vmalloc.h> |
3a4d5c94 MT |
23 | |
24 | #include <linux/net.h> | |
25 | #include <linux/if_packet.h> | |
26 | #include <linux/if_arp.h> | |
27 | #include <linux/if_tun.h> | |
501c774c | 28 | #include <linux/if_macvlan.h> |
635b8c8e | 29 | #include <linux/if_tap.h> |
c53cff5e | 30 | #include <linux/if_vlan.h> |
c67df11f JW |
31 | #include <linux/skb_array.h> |
32 | #include <linux/skbuff.h> | |
3a4d5c94 MT |
33 | |
34 | #include <net/sock.h> | |
1ffcbc85 | 35 | #include <net/xdp.h> |
3a4d5c94 MT |
36 | |
37 | #include "vhost.h" | |
38 | ||
f9611c43 | 39 | static int experimental_zcopytx = 1; |
bab632d6 | 40 | module_param(experimental_zcopytx, int, 0444); |
f9611c43 MT |
41 | MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;" |
42 | " 1 -Enable; 0 - Disable"); | |
bab632d6 | 43 | |
3a4d5c94 MT |
44 | /* Max number of bytes transferred before requeueing the job. |
45 | * Using this limit prevents one virtqueue from starving others. */ | |
46 | #define VHOST_NET_WEIGHT 0x80000 | |
47 | ||
a2ac9990 | 48 | /* Max number of packets transferred before requeueing the job. |
db688c24 PA |
49 | * Using this limit prevents one virtqueue from starving others with small |
50 | * pkts. | |
51 | */ | |
52 | #define VHOST_NET_PKT_WEIGHT 256 | |
a2ac9990 | 53 | |
bab632d6 MT |
54 | /* MAX number of TX used buffers for outstanding zerocopy */ |
55 | #define VHOST_MAX_PEND 128 | |
56 | #define VHOST_GOODCOPY_LEN 256 | |
57 | ||
eaae8132 MT |
58 | /* |
59 | * For transmit, used buffer len is unused; we override it to track buffer | |
60 | * status internally; used for zerocopy tx only. | |
61 | */ | |
62 | /* Lower device DMA failed */ | |
bf995734 | 63 | #define VHOST_DMA_FAILED_LEN ((__force __virtio32)3) |
eaae8132 | 64 | /* Lower device DMA done */ |
bf995734 | 65 | #define VHOST_DMA_DONE_LEN ((__force __virtio32)2) |
eaae8132 | 66 | /* Lower device DMA in progress */ |
bf995734 | 67 | #define VHOST_DMA_IN_PROGRESS ((__force __virtio32)1) |
eaae8132 | 68 | /* Buffer unused */ |
bf995734 | 69 | #define VHOST_DMA_CLEAR_LEN ((__force __virtio32)0) |
eaae8132 | 70 | |
bf995734 | 71 | #define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force u32)VHOST_DMA_DONE_LEN) |
eaae8132 | 72 | |
8570a6e7 AH |
73 | enum { |
74 | VHOST_NET_FEATURES = VHOST_FEATURES | | |
75 | (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) | | |
6b1e6cc7 JW |
76 | (1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
77 | (1ULL << VIRTIO_F_IOMMU_PLATFORM) | |
8570a6e7 AH |
78 | }; |
79 | ||
3a4d5c94 MT |
80 | enum { |
81 | VHOST_NET_VQ_RX = 0, | |
82 | VHOST_NET_VQ_TX = 1, | |
83 | VHOST_NET_VQ_MAX = 2, | |
84 | }; | |
85 | ||
fe729a57 | 86 | struct vhost_net_ubuf_ref { |
0ad8b480 MT |
87 | /* refcount follows semantics similar to kref: |
88 | * 0: object is released | |
89 | * 1: no outstanding ubufs | |
90 | * >1: outstanding ubufs | |
91 | */ | |
92 | atomic_t refcount; | |
2839400f AH |
93 | wait_queue_head_t wait; |
94 | struct vhost_virtqueue *vq; | |
95 | }; | |
96 | ||
c67df11f JW |
97 | #define VHOST_RX_BATCH 64 |
98 | struct vhost_net_buf { | |
5990a305 | 99 | void **queue; |
c67df11f JW |
100 | int tail; |
101 | int head; | |
102 | }; | |
103 | ||
3ab2e420 AH |
104 | struct vhost_net_virtqueue { |
105 | struct vhost_virtqueue vq; | |
81f95a55 MT |
106 | size_t vhost_hlen; |
107 | size_t sock_hlen; | |
2839400f AH |
108 | /* vhost zerocopy support fields below: */ |
109 | /* last used idx for outstanding DMA zerocopy buffers */ | |
110 | int upend_idx; | |
f5a4941a JW |
111 | /* For TX, first used idx for DMA done zerocopy buffers |
112 | * For RX, number of batched heads | |
113 | */ | |
2839400f AH |
114 | int done_idx; |
115 | /* an array of userspace buffers info */ | |
116 | struct ubuf_info *ubuf_info; | |
117 | /* Reference counting for outstanding ubufs. | |
118 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 119 | struct vhost_net_ubuf_ref *ubufs; |
5990a305 | 120 | struct ptr_ring *rx_ring; |
c67df11f | 121 | struct vhost_net_buf rxq; |
3ab2e420 AH |
122 | }; |
123 | ||
3a4d5c94 MT |
124 | struct vhost_net { |
125 | struct vhost_dev dev; | |
3ab2e420 | 126 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 127 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
128 | /* Number of TX recently submitted. |
129 | * Protected by tx vq lock. */ | |
130 | unsigned tx_packets; | |
131 | /* Number of times zerocopy TX recently failed. | |
132 | * Protected by tx vq lock. */ | |
133 | unsigned tx_zcopy_err; | |
1280c27f MT |
134 | /* Flush in progress. Protected by tx vq lock. */ |
135 | bool tx_flush; | |
3a4d5c94 MT |
136 | }; |
137 | ||
fe729a57 | 138 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 139 | |
c67df11f JW |
140 | static void *vhost_net_buf_get_ptr(struct vhost_net_buf *rxq) |
141 | { | |
142 | if (rxq->tail != rxq->head) | |
143 | return rxq->queue[rxq->head]; | |
144 | else | |
145 | return NULL; | |
146 | } | |
147 | ||
148 | static int vhost_net_buf_get_size(struct vhost_net_buf *rxq) | |
149 | { | |
150 | return rxq->tail - rxq->head; | |
151 | } | |
152 | ||
153 | static int vhost_net_buf_is_empty(struct vhost_net_buf *rxq) | |
154 | { | |
155 | return rxq->tail == rxq->head; | |
156 | } | |
157 | ||
158 | static void *vhost_net_buf_consume(struct vhost_net_buf *rxq) | |
159 | { | |
160 | void *ret = vhost_net_buf_get_ptr(rxq); | |
161 | ++rxq->head; | |
162 | return ret; | |
163 | } | |
164 | ||
165 | static int vhost_net_buf_produce(struct vhost_net_virtqueue *nvq) | |
166 | { | |
167 | struct vhost_net_buf *rxq = &nvq->rxq; | |
168 | ||
169 | rxq->head = 0; | |
5990a305 | 170 | rxq->tail = ptr_ring_consume_batched(nvq->rx_ring, rxq->queue, |
c67df11f JW |
171 | VHOST_RX_BATCH); |
172 | return rxq->tail; | |
173 | } | |
174 | ||
175 | static void vhost_net_buf_unproduce(struct vhost_net_virtqueue *nvq) | |
176 | { | |
177 | struct vhost_net_buf *rxq = &nvq->rxq; | |
178 | ||
5990a305 JW |
179 | if (nvq->rx_ring && !vhost_net_buf_is_empty(rxq)) { |
180 | ptr_ring_unconsume(nvq->rx_ring, rxq->queue + rxq->head, | |
181 | vhost_net_buf_get_size(rxq), | |
3a403076 | 182 | tun_ptr_free); |
c67df11f JW |
183 | rxq->head = rxq->tail = 0; |
184 | } | |
185 | } | |
186 | ||
fc72d1d5 JW |
187 | static int vhost_net_buf_peek_len(void *ptr) |
188 | { | |
1ffcbc85 JDB |
189 | if (tun_is_xdp_frame(ptr)) { |
190 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 191 | |
1ffcbc85 | 192 | return xdpf->len; |
fc72d1d5 JW |
193 | } |
194 | ||
195 | return __skb_array_len_with_tag(ptr); | |
196 | } | |
197 | ||
c67df11f JW |
198 | static int vhost_net_buf_peek(struct vhost_net_virtqueue *nvq) |
199 | { | |
200 | struct vhost_net_buf *rxq = &nvq->rxq; | |
201 | ||
202 | if (!vhost_net_buf_is_empty(rxq)) | |
203 | goto out; | |
204 | ||
205 | if (!vhost_net_buf_produce(nvq)) | |
206 | return 0; | |
207 | ||
208 | out: | |
fc72d1d5 | 209 | return vhost_net_buf_peek_len(vhost_net_buf_get_ptr(rxq)); |
c67df11f JW |
210 | } |
211 | ||
212 | static void vhost_net_buf_init(struct vhost_net_buf *rxq) | |
213 | { | |
214 | rxq->head = rxq->tail = 0; | |
215 | } | |
216 | ||
fe729a57 | 217 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 218 | { |
fe729a57 | 219 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
220 | } |
221 | ||
fe729a57 AH |
222 | static struct vhost_net_ubuf_ref * |
223 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 224 | { |
fe729a57 | 225 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
226 | /* No zero copy backend? Nothing to count. */ |
227 | if (!zcopy) | |
228 | return NULL; | |
229 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
230 | if (!ubufs) | |
231 | return ERR_PTR(-ENOMEM); | |
0ad8b480 | 232 | atomic_set(&ubufs->refcount, 1); |
2839400f AH |
233 | init_waitqueue_head(&ubufs->wait); |
234 | ubufs->vq = vq; | |
235 | return ubufs; | |
236 | } | |
237 | ||
0ad8b480 | 238 | static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 239 | { |
0ad8b480 MT |
240 | int r = atomic_sub_return(1, &ubufs->refcount); |
241 | if (unlikely(!r)) | |
242 | wake_up(&ubufs->wait); | |
243 | return r; | |
2839400f AH |
244 | } |
245 | ||
fe729a57 | 246 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 247 | { |
0ad8b480 MT |
248 | vhost_net_ubuf_put(ubufs); |
249 | wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); | |
c38e39c3 MT |
250 | } |
251 | ||
252 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
253 | { | |
254 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
255 | kfree(ubufs); |
256 | } | |
257 | ||
b1ad8496 AH |
258 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
259 | { | |
b1ad8496 AH |
260 | int i; |
261 | ||
288cfe78 MT |
262 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
263 | kfree(n->vqs[i].ubuf_info); | |
264 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
265 | } |
266 | } | |
267 | ||
0a1febf7 | 268 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
269 | { |
270 | bool zcopy; | |
271 | int i; | |
272 | ||
288cfe78 | 273 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 274 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
275 | if (!zcopy) |
276 | continue; | |
6da2ec56 KC |
277 | n->vqs[i].ubuf_info = |
278 | kmalloc_array(UIO_MAXIOV, | |
279 | sizeof(*n->vqs[i].ubuf_info), | |
280 | GFP_KERNEL); | |
2839400f AH |
281 | if (!n->vqs[i].ubuf_info) |
282 | goto err; | |
283 | } | |
284 | return 0; | |
285 | ||
286 | err: | |
288cfe78 | 287 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
288 | return -ENOMEM; |
289 | } | |
290 | ||
0a1febf7 | 291 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
292 | { |
293 | int i; | |
294 | ||
288cfe78 MT |
295 | vhost_net_clear_ubuf_info(n); |
296 | ||
2839400f AH |
297 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
298 | n->vqs[i].done_idx = 0; | |
299 | n->vqs[i].upend_idx = 0; | |
300 | n->vqs[i].ubufs = NULL; | |
81f95a55 MT |
301 | n->vqs[i].vhost_hlen = 0; |
302 | n->vqs[i].sock_hlen = 0; | |
c67df11f | 303 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f AH |
304 | } |
305 | ||
306 | } | |
307 | ||
eaae8132 MT |
308 | static void vhost_net_tx_packet(struct vhost_net *net) |
309 | { | |
310 | ++net->tx_packets; | |
311 | if (net->tx_packets < 1024) | |
312 | return; | |
313 | net->tx_packets = 0; | |
314 | net->tx_zcopy_err = 0; | |
315 | } | |
316 | ||
317 | static void vhost_net_tx_err(struct vhost_net *net) | |
318 | { | |
319 | ++net->tx_zcopy_err; | |
320 | } | |
321 | ||
322 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
323 | { | |
1280c27f MT |
324 | /* TX flush waits for outstanding DMAs to be done. |
325 | * Don't start new DMAs. | |
326 | */ | |
327 | return !net->tx_flush && | |
328 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
329 | } |
330 | ||
bab632d6 MT |
331 | static bool vhost_sock_zcopy(struct socket *sock) |
332 | { | |
333 | return unlikely(experimental_zcopytx) && | |
334 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
335 | } | |
336 | ||
b211616d MT |
337 | /* In case of DMA done not in order in lower device driver for some reason. |
338 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
339 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
340 | * guest used idx. | |
341 | */ | |
094afe7d JW |
342 | static void vhost_zerocopy_signal_used(struct vhost_net *net, |
343 | struct vhost_virtqueue *vq) | |
b211616d | 344 | { |
2839400f AH |
345 | struct vhost_net_virtqueue *nvq = |
346 | container_of(vq, struct vhost_net_virtqueue, vq); | |
c92112ae | 347 | int i, add; |
b211616d MT |
348 | int j = 0; |
349 | ||
2839400f | 350 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
351 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
352 | vhost_net_tx_err(net); | |
b211616d MT |
353 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
354 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
b211616d MT |
355 | ++j; |
356 | } else | |
357 | break; | |
358 | } | |
c92112ae JW |
359 | while (j) { |
360 | add = min(UIO_MAXIOV - nvq->done_idx, j); | |
361 | vhost_add_used_and_signal_n(vq->dev, vq, | |
362 | &vq->heads[nvq->done_idx], add); | |
363 | nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; | |
364 | j -= add; | |
365 | } | |
b211616d MT |
366 | } |
367 | ||
eaae8132 | 368 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 369 | { |
fe729a57 | 370 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 371 | struct vhost_virtqueue *vq = ubufs->vq; |
0ad8b480 | 372 | int cnt; |
24eb21a1 | 373 | |
b0c057ca MT |
374 | rcu_read_lock_bh(); |
375 | ||
19c73b3e JW |
376 | /* set len to mark this desc buffers done DMA */ |
377 | vq->heads[ubuf->desc].len = success ? | |
378 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
0ad8b480 | 379 | cnt = vhost_net_ubuf_put(ubufs); |
19c73b3e | 380 | |
24eb21a1 MT |
381 | /* |
382 | * Trigger polling thread if guest stopped submitting new buffers: | |
0ad8b480 | 383 | * in this case, the refcount after decrement will eventually reach 1. |
24eb21a1 MT |
384 | * We also trigger polling periodically after each 16 packets |
385 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
386 | * less than 10% of times). | |
387 | */ | |
0ad8b480 | 388 | if (cnt <= 1 || !(cnt % 16)) |
24eb21a1 | 389 | vhost_poll_queue(&vq->poll); |
b0c057ca MT |
390 | |
391 | rcu_read_unlock_bh(); | |
b211616d MT |
392 | } |
393 | ||
03088137 JW |
394 | static inline unsigned long busy_clock(void) |
395 | { | |
396 | return local_clock() >> 10; | |
397 | } | |
398 | ||
399 | static bool vhost_can_busy_poll(struct vhost_dev *dev, | |
400 | unsigned long endtime) | |
401 | { | |
402 | return likely(!need_resched()) && | |
403 | likely(!time_after(busy_clock(), endtime)) && | |
404 | likely(!signal_pending(current)) && | |
405 | !vhost_has_work(dev); | |
406 | } | |
407 | ||
8241a1e4 JW |
408 | static void vhost_net_disable_vq(struct vhost_net *n, |
409 | struct vhost_virtqueue *vq) | |
410 | { | |
411 | struct vhost_net_virtqueue *nvq = | |
412 | container_of(vq, struct vhost_net_virtqueue, vq); | |
413 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
414 | if (!vq->private_data) | |
415 | return; | |
416 | vhost_poll_stop(poll); | |
417 | } | |
418 | ||
419 | static int vhost_net_enable_vq(struct vhost_net *n, | |
420 | struct vhost_virtqueue *vq) | |
421 | { | |
422 | struct vhost_net_virtqueue *nvq = | |
423 | container_of(vq, struct vhost_net_virtqueue, vq); | |
424 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
425 | struct socket *sock; | |
426 | ||
427 | sock = vq->private_data; | |
428 | if (!sock) | |
429 | return 0; | |
430 | ||
431 | return vhost_poll_start(poll, sock->file); | |
432 | } | |
433 | ||
03088137 JW |
434 | static int vhost_net_tx_get_vq_desc(struct vhost_net *net, |
435 | struct vhost_virtqueue *vq, | |
436 | struct iovec iov[], unsigned int iov_size, | |
437 | unsigned int *out_num, unsigned int *in_num) | |
438 | { | |
439 | unsigned long uninitialized_var(endtime); | |
440 | int r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 441 | out_num, in_num, NULL, NULL); |
03088137 JW |
442 | |
443 | if (r == vq->num && vq->busyloop_timeout) { | |
444 | preempt_disable(); | |
445 | endtime = busy_clock() + vq->busyloop_timeout; | |
446 | while (vhost_can_busy_poll(vq->dev, endtime) && | |
447 | vhost_vq_avail_empty(vq->dev, vq)) | |
f2f09a4c | 448 | cpu_relax(); |
03088137 JW |
449 | preempt_enable(); |
450 | r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 451 | out_num, in_num, NULL, NULL); |
03088137 JW |
452 | } |
453 | ||
454 | return r; | |
455 | } | |
456 | ||
0ed005ce JW |
457 | static bool vhost_exceeds_maxpend(struct vhost_net *net) |
458 | { | |
459 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
460 | struct vhost_virtqueue *vq = &nvq->vq; | |
461 | ||
1e6f7453 WB |
462 | return (nvq->upend_idx + UIO_MAXIOV - nvq->done_idx) % UIO_MAXIOV > |
463 | min_t(unsigned int, VHOST_MAX_PEND, vq->num >> 2); | |
0ed005ce JW |
464 | } |
465 | ||
3a4d5c94 MT |
466 | /* Expects to be always run from workqueue - which acts as |
467 | * read-size critical section for our kind of RCU. */ | |
468 | static void handle_tx(struct vhost_net *net) | |
469 | { | |
2839400f | 470 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 471 | struct vhost_virtqueue *vq = &nvq->vq; |
98a527aa | 472 | unsigned out, in; |
d5675bd2 | 473 | int head; |
3a4d5c94 MT |
474 | struct msghdr msg = { |
475 | .msg_name = NULL, | |
476 | .msg_namelen = 0, | |
477 | .msg_control = NULL, | |
478 | .msg_controllen = 0, | |
3a4d5c94 MT |
479 | .msg_flags = MSG_DONTWAIT, |
480 | }; | |
481 | size_t len, total_len = 0; | |
70181d51 | 482 | int err; |
3a4d5c94 | 483 | size_t hdr_size; |
28457ee6 | 484 | struct socket *sock; |
fe729a57 | 485 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 486 | bool zcopy, zcopy_used; |
a2ac9990 | 487 | int sent_pkts = 0; |
28457ee6 | 488 | |
2e26af79 AH |
489 | mutex_lock(&vq->mutex); |
490 | sock = vq->private_data; | |
3a4d5c94 | 491 | if (!sock) |
2e26af79 | 492 | goto out; |
3a4d5c94 | 493 | |
6b1e6cc7 JW |
494 | if (!vq_iotlb_prefetch(vq)) |
495 | goto out; | |
496 | ||
8ea8cf89 | 497 | vhost_disable_notify(&net->dev, vq); |
feb8892c | 498 | vhost_net_disable_vq(net, vq); |
3a4d5c94 | 499 | |
81f95a55 | 500 | hdr_size = nvq->vhost_hlen; |
2839400f | 501 | zcopy = nvq->ubufs; |
3a4d5c94 MT |
502 | |
503 | for (;;) { | |
bab632d6 MT |
504 | /* Release DMAs done buffers first */ |
505 | if (zcopy) | |
eaae8132 | 506 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 507 | |
f7c6be40 | 508 | |
03088137 JW |
509 | head = vhost_net_tx_get_vq_desc(net, vq, vq->iov, |
510 | ARRAY_SIZE(vq->iov), | |
511 | &out, &in); | |
d5675bd2 | 512 | /* On error, stop handling until the next kick. */ |
7b3384fc | 513 | if (unlikely(head < 0)) |
d5675bd2 | 514 | break; |
3a4d5c94 MT |
515 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
516 | if (head == vq->num) { | |
8ea8cf89 MT |
517 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
518 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
519 | continue; |
520 | } | |
521 | break; | |
522 | } | |
523 | if (in) { | |
524 | vq_err(vq, "Unexpected descriptor format for TX: " | |
525 | "out %d, int %d\n", out, in); | |
526 | break; | |
527 | } | |
528 | /* Skip header. TODO: support TSO. */ | |
3a4d5c94 | 529 | len = iov_length(vq->iov, out); |
c0371da6 | 530 | iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len); |
98a527aa | 531 | iov_iter_advance(&msg.msg_iter, hdr_size); |
3a4d5c94 | 532 | /* Sanity check */ |
01e97e65 | 533 | if (!msg_data_left(&msg)) { |
3a4d5c94 MT |
534 | vq_err(vq, "Unexpected header len for TX: " |
535 | "%zd expected %zd\n", | |
98a527aa | 536 | len, hdr_size); |
3a4d5c94 MT |
537 | break; |
538 | } | |
01e97e65 | 539 | len = msg_data_left(&msg); |
ce21a029 JW |
540 | |
541 | zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN | |
1e6f7453 | 542 | && !vhost_exceeds_maxpend(net) |
ce21a029 | 543 | && vhost_net_tx_select_zcopy(net); |
cedb9bdc | 544 | |
bab632d6 | 545 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 546 | if (zcopy_used) { |
ce21a029 JW |
547 | struct ubuf_info *ubuf; |
548 | ubuf = nvq->ubuf_info + nvq->upend_idx; | |
549 | ||
8b38694a | 550 | vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); |
ce21a029 JW |
551 | vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; |
552 | ubuf->callback = vhost_zerocopy_callback; | |
553 | ubuf->ctx = nvq->ubufs; | |
554 | ubuf->desc = nvq->upend_idx; | |
c1d1b437 | 555 | refcount_set(&ubuf->refcnt, 1); |
ce21a029 JW |
556 | msg.msg_control = ubuf; |
557 | msg.msg_controllen = sizeof(ubuf); | |
558 | ubufs = nvq->ubufs; | |
0ad8b480 | 559 | atomic_inc(&ubufs->refcount); |
2839400f | 560 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
ce21a029 | 561 | } else { |
4364d5f9 | 562 | msg.msg_control = NULL; |
ce21a029 JW |
563 | ubufs = NULL; |
564 | } | |
0ed005ce JW |
565 | |
566 | total_len += len; | |
567 | if (total_len < VHOST_NET_WEIGHT && | |
568 | !vhost_vq_avail_empty(&net->dev, vq) && | |
569 | likely(!vhost_exceeds_maxpend(net))) { | |
570 | msg.msg_flags |= MSG_MORE; | |
571 | } else { | |
572 | msg.msg_flags &= ~MSG_MORE; | |
573 | } | |
574 | ||
3a4d5c94 | 575 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
1b784140 | 576 | err = sock->ops->sendmsg(sock, &msg, len); |
3a4d5c94 | 577 | if (unlikely(err < 0)) { |
cedb9bdc | 578 | if (zcopy_used) { |
ce21a029 | 579 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
580 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
581 | % UIO_MAXIOV; | |
bab632d6 | 582 | } |
8dd014ad | 583 | vhost_discard_vq_desc(vq, 1); |
feb8892c | 584 | vhost_net_enable_vq(net, vq); |
3a4d5c94 MT |
585 | break; |
586 | } | |
587 | if (err != len) | |
95c0ec6a MT |
588 | pr_debug("Truncated TX packet: " |
589 | " len %d != %zd\n", err, len); | |
cedb9bdc | 590 | if (!zcopy_used) |
bab632d6 | 591 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 592 | else |
eaae8132 | 593 | vhost_zerocopy_signal_used(net, vq); |
eaae8132 | 594 | vhost_net_tx_packet(net); |
a2ac9990 | 595 | if (unlikely(total_len >= VHOST_NET_WEIGHT) || |
db688c24 | 596 | unlikely(++sent_pkts >= VHOST_NET_PKT_WEIGHT)) { |
3a4d5c94 MT |
597 | vhost_poll_queue(&vq->poll); |
598 | break; | |
599 | } | |
600 | } | |
2e26af79 | 601 | out: |
3a4d5c94 | 602 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
603 | } |
604 | ||
c67df11f | 605 | static int peek_head_len(struct vhost_net_virtqueue *rvq, struct sock *sk) |
8dd014ad DS |
606 | { |
607 | struct sk_buff *head; | |
608 | int len = 0; | |
783e3988 | 609 | unsigned long flags; |
8dd014ad | 610 | |
5990a305 | 611 | if (rvq->rx_ring) |
c67df11f | 612 | return vhost_net_buf_peek(rvq); |
1576d986 | 613 | |
783e3988 | 614 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 615 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 616 | if (likely(head)) { |
8dd014ad | 617 | len = head->len; |
df8a39de | 618 | if (skb_vlan_tag_present(head)) |
c53cff5e BG |
619 | len += VLAN_HLEN; |
620 | } | |
621 | ||
783e3988 | 622 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
623 | return len; |
624 | } | |
625 | ||
1576d986 JW |
626 | static int sk_has_rx_data(struct sock *sk) |
627 | { | |
628 | struct socket *sock = sk->sk_socket; | |
629 | ||
630 | if (sock->ops->peek_len) | |
631 | return sock->ops->peek_len(sock); | |
632 | ||
633 | return skb_queue_empty(&sk->sk_receive_queue); | |
634 | } | |
635 | ||
f5a4941a JW |
636 | static void vhost_rx_signal_used(struct vhost_net_virtqueue *nvq) |
637 | { | |
638 | struct vhost_virtqueue *vq = &nvq->vq; | |
639 | struct vhost_dev *dev = vq->dev; | |
640 | ||
641 | if (!nvq->done_idx) | |
642 | return; | |
643 | ||
644 | vhost_add_used_and_signal_n(dev, vq, vq->heads, nvq->done_idx); | |
645 | nvq->done_idx = 0; | |
646 | } | |
647 | ||
03088137 JW |
648 | static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk) |
649 | { | |
c67df11f | 650 | struct vhost_net_virtqueue *rvq = &net->vqs[VHOST_NET_VQ_RX]; |
03088137 JW |
651 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
652 | struct vhost_virtqueue *vq = &nvq->vq; | |
653 | unsigned long uninitialized_var(endtime); | |
c67df11f | 654 | int len = peek_head_len(rvq, sk); |
03088137 JW |
655 | |
656 | if (!len && vq->busyloop_timeout) { | |
f5a4941a JW |
657 | /* Flush batched heads first */ |
658 | vhost_rx_signal_used(rvq); | |
03088137 | 659 | /* Both tx vq and rx socket were polled here */ |
aaa3149b | 660 | mutex_lock_nested(&vq->mutex, 1); |
03088137 JW |
661 | vhost_disable_notify(&net->dev, vq); |
662 | ||
663 | preempt_disable(); | |
664 | endtime = busy_clock() + vq->busyloop_timeout; | |
665 | ||
666 | while (vhost_can_busy_poll(&net->dev, endtime) && | |
1576d986 | 667 | !sk_has_rx_data(sk) && |
03088137 | 668 | vhost_vq_avail_empty(&net->dev, vq)) |
f2f09a4c | 669 | cpu_relax(); |
03088137 JW |
670 | |
671 | preempt_enable(); | |
672 | ||
8b949bef | 673 | if (!vhost_vq_avail_empty(&net->dev, vq)) |
03088137 | 674 | vhost_poll_queue(&vq->poll); |
8b949bef JW |
675 | else if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
676 | vhost_disable_notify(&net->dev, vq); | |
677 | vhost_poll_queue(&vq->poll); | |
678 | } | |
679 | ||
03088137 JW |
680 | mutex_unlock(&vq->mutex); |
681 | ||
c67df11f | 682 | len = peek_head_len(rvq, sk); |
03088137 JW |
683 | } |
684 | ||
685 | return len; | |
686 | } | |
687 | ||
8dd014ad DS |
688 | /* This is a multi-buffer version of vhost_get_desc, that works if |
689 | * vq has read descriptors only. | |
690 | * @vq - the relevant virtqueue | |
691 | * @datalen - data length we'll be reading | |
692 | * @iovcount - returned count of io vectors we fill | |
693 | * @log - vhost log | |
694 | * @log_num - log offset | |
94249369 | 695 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
696 | * returns number of buffer heads allocated, negative on error |
697 | */ | |
698 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
699 | struct vring_used_elem *heads, | |
700 | int datalen, | |
701 | unsigned *iovcount, | |
702 | struct vhost_log *log, | |
94249369 JW |
703 | unsigned *log_num, |
704 | unsigned int quota) | |
8dd014ad DS |
705 | { |
706 | unsigned int out, in; | |
707 | int seg = 0; | |
708 | int headcount = 0; | |
709 | unsigned d; | |
710 | int r, nlogs = 0; | |
8b38694a MT |
711 | /* len is always initialized before use since we are always called with |
712 | * datalen > 0. | |
713 | */ | |
714 | u32 uninitialized_var(len); | |
8dd014ad | 715 | |
94249369 | 716 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 717 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
718 | r = -ENOBUFS; |
719 | goto err; | |
720 | } | |
47283bef | 721 | r = vhost_get_vq_desc(vq, vq->iov + seg, |
8dd014ad DS |
722 | ARRAY_SIZE(vq->iov) - seg, &out, |
723 | &in, log, log_num); | |
a39ee449 MT |
724 | if (unlikely(r < 0)) |
725 | goto err; | |
726 | ||
727 | d = r; | |
8dd014ad DS |
728 | if (d == vq->num) { |
729 | r = 0; | |
730 | goto err; | |
731 | } | |
732 | if (unlikely(out || in <= 0)) { | |
733 | vq_err(vq, "unexpected descriptor format for RX: " | |
734 | "out %d, in %d\n", out, in); | |
735 | r = -EINVAL; | |
736 | goto err; | |
737 | } | |
738 | if (unlikely(log)) { | |
739 | nlogs += *log_num; | |
740 | log += *log_num; | |
741 | } | |
8b38694a MT |
742 | heads[headcount].id = cpu_to_vhost32(vq, d); |
743 | len = iov_length(vq->iov + seg, in); | |
744 | heads[headcount].len = cpu_to_vhost32(vq, len); | |
745 | datalen -= len; | |
8dd014ad DS |
746 | ++headcount; |
747 | seg += in; | |
748 | } | |
99975cc6 | 749 | heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); |
8dd014ad DS |
750 | *iovcount = seg; |
751 | if (unlikely(log)) | |
752 | *log_num = nlogs; | |
d8316f39 MT |
753 | |
754 | /* Detect overrun */ | |
755 | if (unlikely(datalen > 0)) { | |
756 | r = UIO_MAXIOV + 1; | |
757 | goto err; | |
758 | } | |
8dd014ad DS |
759 | return headcount; |
760 | err: | |
761 | vhost_discard_vq_desc(vq, headcount); | |
762 | return r; | |
763 | } | |
764 | ||
3a4d5c94 MT |
765 | /* Expects to be always run from workqueue - which acts as |
766 | * read-size critical section for our kind of RCU. */ | |
94249369 | 767 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 768 | { |
81f95a55 MT |
769 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
770 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
771 | unsigned uninitialized_var(in), log; |
772 | struct vhost_log *vq_log; | |
773 | struct msghdr msg = { | |
774 | .msg_name = NULL, | |
775 | .msg_namelen = 0, | |
776 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
777 | .msg_controllen = 0, | |
8dd014ad DS |
778 | .msg_flags = MSG_DONTWAIT, |
779 | }; | |
0960b641 JW |
780 | struct virtio_net_hdr hdr = { |
781 | .flags = 0, | |
782 | .gso_type = VIRTIO_NET_HDR_GSO_NONE | |
8dd014ad | 783 | }; |
8dd014ad | 784 | size_t total_len = 0; |
910a578f | 785 | int err, mergeable; |
f5a4941a | 786 | s16 headcount; |
8dd014ad DS |
787 | size_t vhost_hlen, sock_hlen; |
788 | size_t vhost_len, sock_len; | |
2e26af79 | 789 | struct socket *sock; |
ba7438ae | 790 | struct iov_iter fixup; |
0960b641 | 791 | __virtio16 num_buffers; |
db688c24 | 792 | int recv_pkts = 0; |
8dd014ad | 793 | |
aaa3149b | 794 | mutex_lock_nested(&vq->mutex, 0); |
2e26af79 AH |
795 | sock = vq->private_data; |
796 | if (!sock) | |
797 | goto out; | |
6b1e6cc7 JW |
798 | |
799 | if (!vq_iotlb_prefetch(vq)) | |
800 | goto out; | |
801 | ||
8ea8cf89 | 802 | vhost_disable_notify(&net->dev, vq); |
8241a1e4 | 803 | vhost_net_disable_vq(net, vq); |
2e26af79 | 804 | |
81f95a55 MT |
805 | vhost_hlen = nvq->vhost_hlen; |
806 | sock_hlen = nvq->sock_hlen; | |
8dd014ad | 807 | |
ea16c514 | 808 | vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ? |
8dd014ad | 809 | vq->log : NULL; |
ea16c514 | 810 | mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad | 811 | |
03088137 | 812 | while ((sock_len = vhost_net_rx_peek_head_len(net, sock->sk))) { |
8dd014ad DS |
813 | sock_len += sock_hlen; |
814 | vhost_len = sock_len + vhost_hlen; | |
f5a4941a JW |
815 | headcount = get_rx_bufs(vq, vq->heads + nvq->done_idx, |
816 | vhost_len, &in, vq_log, &log, | |
94249369 | 817 | likely(mergeable) ? UIO_MAXIOV : 1); |
8dd014ad DS |
818 | /* On error, stop handling until the next kick. */ |
819 | if (unlikely(headcount < 0)) | |
8241a1e4 | 820 | goto out; |
8dd014ad DS |
821 | /* OK, now we need to know about added descriptors. */ |
822 | if (!headcount) { | |
8ea8cf89 | 823 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
824 | /* They have slipped one in as we were |
825 | * doing that: check again. */ | |
8ea8cf89 | 826 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
827 | continue; |
828 | } | |
829 | /* Nothing new? Wait for eventfd to tell us | |
830 | * they refilled. */ | |
8241a1e4 | 831 | goto out; |
8dd014ad | 832 | } |
5990a305 | 833 | if (nvq->rx_ring) |
6e474083 WX |
834 | msg.msg_control = vhost_net_buf_consume(&nvq->rxq); |
835 | /* On overrun, truncate and discard */ | |
836 | if (unlikely(headcount > UIO_MAXIOV)) { | |
837 | iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); | |
838 | err = sock->ops->recvmsg(sock, &msg, | |
839 | 1, MSG_DONTWAIT | MSG_TRUNC); | |
840 | pr_debug("Discarded rx packet: len %zd\n", sock_len); | |
841 | continue; | |
842 | } | |
8dd014ad | 843 | /* We don't need to be notified again. */ |
ba7438ae AV |
844 | iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len); |
845 | fixup = msg.msg_iter; | |
846 | if (unlikely((vhost_hlen))) { | |
847 | /* We will supply the header ourselves | |
848 | * TODO: support TSO. | |
849 | */ | |
850 | iov_iter_advance(&msg.msg_iter, vhost_hlen); | |
ba7438ae | 851 | } |
1b784140 | 852 | err = sock->ops->recvmsg(sock, &msg, |
8dd014ad DS |
853 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
854 | /* Userspace might have consumed the packet meanwhile: | |
855 | * it's not supposed to do this usually, but might be hard | |
856 | * to prevent. Discard data we got (if any) and keep going. */ | |
857 | if (unlikely(err != sock_len)) { | |
858 | pr_debug("Discarded rx packet: " | |
859 | " len %d, expected %zd\n", err, sock_len); | |
860 | vhost_discard_vq_desc(vq, headcount); | |
861 | continue; | |
862 | } | |
ba7438ae | 863 | /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ |
4c5a8442 MT |
864 | if (unlikely(vhost_hlen)) { |
865 | if (copy_to_iter(&hdr, sizeof(hdr), | |
866 | &fixup) != sizeof(hdr)) { | |
867 | vq_err(vq, "Unable to write vnet_hdr " | |
868 | "at addr %p\n", vq->iov->iov_base); | |
8241a1e4 | 869 | goto out; |
4c5a8442 MT |
870 | } |
871 | } else { | |
872 | /* Header came from socket; we'll need to patch | |
873 | * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF | |
874 | */ | |
875 | iov_iter_advance(&fixup, sizeof(hdr)); | |
8dd014ad DS |
876 | } |
877 | /* TODO: Should check and handle checksum. */ | |
5201aa49 | 878 | |
0960b641 | 879 | num_buffers = cpu_to_vhost16(vq, headcount); |
cfbdab95 | 880 | if (likely(mergeable) && |
0d79a493 MT |
881 | copy_to_iter(&num_buffers, sizeof num_buffers, |
882 | &fixup) != sizeof num_buffers) { | |
8dd014ad DS |
883 | vq_err(vq, "Failed num_buffers write"); |
884 | vhost_discard_vq_desc(vq, headcount); | |
8241a1e4 | 885 | goto out; |
8dd014ad | 886 | } |
f5a4941a JW |
887 | nvq->done_idx += headcount; |
888 | if (nvq->done_idx > VHOST_RX_BATCH) | |
889 | vhost_rx_signal_used(nvq); | |
8dd014ad DS |
890 | if (unlikely(vq_log)) |
891 | vhost_log_write(vq, vq_log, log, vhost_len); | |
892 | total_len += vhost_len; | |
db688c24 PA |
893 | if (unlikely(total_len >= VHOST_NET_WEIGHT) || |
894 | unlikely(++recv_pkts >= VHOST_NET_PKT_WEIGHT)) { | |
8dd014ad | 895 | vhost_poll_queue(&vq->poll); |
8241a1e4 | 896 | goto out; |
8dd014ad DS |
897 | } |
898 | } | |
8241a1e4 | 899 | vhost_net_enable_vq(net, vq); |
2e26af79 | 900 | out: |
f5a4941a | 901 | vhost_rx_signal_used(nvq); |
8dd014ad | 902 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
903 | } |
904 | ||
c23f3445 | 905 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 906 | { |
c23f3445 TH |
907 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
908 | poll.work); | |
909 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
910 | ||
3a4d5c94 MT |
911 | handle_tx(net); |
912 | } | |
913 | ||
c23f3445 | 914 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 915 | { |
c23f3445 TH |
916 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
917 | poll.work); | |
918 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
919 | ||
3a4d5c94 MT |
920 | handle_rx(net); |
921 | } | |
922 | ||
c23f3445 | 923 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 924 | { |
c23f3445 TH |
925 | struct vhost_net *net = container_of(work, struct vhost_net, |
926 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
927 | handle_tx(net); |
928 | } | |
929 | ||
c23f3445 | 930 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 931 | { |
c23f3445 TH |
932 | struct vhost_net *net = container_of(work, struct vhost_net, |
933 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
934 | handle_rx(net); |
935 | } | |
936 | ||
937 | static int vhost_net_open(struct inode *inode, struct file *f) | |
938 | { | |
23cc5a99 | 939 | struct vhost_net *n; |
c23f3445 | 940 | struct vhost_dev *dev; |
3ab2e420 | 941 | struct vhost_virtqueue **vqs; |
5990a305 | 942 | void **queue; |
59566b6e | 943 | int i; |
c23f3445 | 944 | |
dcda9b04 | 945 | n = kvmalloc(sizeof *n, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
6c5ab651 MH |
946 | if (!n) |
947 | return -ENOMEM; | |
6da2ec56 | 948 | vqs = kmalloc_array(VHOST_NET_VQ_MAX, sizeof(*vqs), GFP_KERNEL); |
3ab2e420 | 949 | if (!vqs) { |
d04257b0 | 950 | kvfree(n); |
3ab2e420 AH |
951 | return -ENOMEM; |
952 | } | |
c23f3445 | 953 | |
5990a305 | 954 | queue = kmalloc_array(VHOST_RX_BATCH, sizeof(void *), |
c67df11f JW |
955 | GFP_KERNEL); |
956 | if (!queue) { | |
957 | kfree(vqs); | |
958 | kvfree(n); | |
959 | return -ENOMEM; | |
960 | } | |
961 | n->vqs[VHOST_NET_VQ_RX].rxq.queue = queue; | |
962 | ||
c23f3445 | 963 | dev = &n->dev; |
3ab2e420 AH |
964 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
965 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
966 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
967 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
968 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
969 | n->vqs[i].ubufs = NULL; | |
970 | n->vqs[i].ubuf_info = NULL; | |
971 | n->vqs[i].upend_idx = 0; | |
972 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
973 | n->vqs[i].vhost_hlen = 0; |
974 | n->vqs[i].sock_hlen = 0; | |
ab7e34b3 | 975 | n->vqs[i].rx_ring = NULL; |
c67df11f | 976 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f | 977 | } |
59566b6e | 978 | vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 | 979 | |
a9a08845 LT |
980 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, EPOLLOUT, dev); |
981 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, EPOLLIN, dev); | |
3a4d5c94 MT |
982 | |
983 | f->private_data = n; | |
984 | ||
985 | return 0; | |
986 | } | |
987 | ||
3a4d5c94 MT |
988 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, |
989 | struct vhost_virtqueue *vq) | |
990 | { | |
991 | struct socket *sock; | |
c67df11f JW |
992 | struct vhost_net_virtqueue *nvq = |
993 | container_of(vq, struct vhost_net_virtqueue, vq); | |
3a4d5c94 MT |
994 | |
995 | mutex_lock(&vq->mutex); | |
22fa90c7 | 996 | sock = vq->private_data; |
3a4d5c94 | 997 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 998 | vq->private_data = NULL; |
c67df11f | 999 | vhost_net_buf_unproduce(nvq); |
303fd71b | 1000 | nvq->rx_ring = NULL; |
3a4d5c94 MT |
1001 | mutex_unlock(&vq->mutex); |
1002 | return sock; | |
1003 | } | |
1004 | ||
1005 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
1006 | struct socket **rx_sock) | |
1007 | { | |
3ab2e420 AH |
1008 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
1009 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
1010 | } |
1011 | ||
1012 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
1013 | { | |
1014 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 1015 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
1016 | } |
1017 | ||
1018 | static void vhost_net_flush(struct vhost_net *n) | |
1019 | { | |
1020 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
1021 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 1022 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 1023 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1024 | n->tx_flush = true; |
3ab2e420 | 1025 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1026 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 1027 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 1028 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1029 | n->tx_flush = false; |
0ad8b480 | 1030 | atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); |
3ab2e420 | 1031 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1032 | } |
3a4d5c94 MT |
1033 | } |
1034 | ||
1035 | static int vhost_net_release(struct inode *inode, struct file *f) | |
1036 | { | |
1037 | struct vhost_net *n = f->private_data; | |
1038 | struct socket *tx_sock; | |
1039 | struct socket *rx_sock; | |
1040 | ||
1041 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
1042 | vhost_net_flush(n); | |
b211616d | 1043 | vhost_dev_stop(&n->dev); |
f6f93f75 | 1044 | vhost_dev_cleanup(&n->dev); |
81f95a55 | 1045 | vhost_net_vq_reset(n); |
3a4d5c94 | 1046 | if (tx_sock) |
09aaacf0 | 1047 | sockfd_put(tx_sock); |
3a4d5c94 | 1048 | if (rx_sock) |
09aaacf0 | 1049 | sockfd_put(rx_sock); |
b0c057ca MT |
1050 | /* Make sure no callbacks are outstanding */ |
1051 | synchronize_rcu_bh(); | |
3a4d5c94 MT |
1052 | /* We do an extra flush before freeing memory, |
1053 | * since jobs can re-queue themselves. */ | |
1054 | vhost_net_flush(n); | |
c67df11f | 1055 | kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue); |
3ab2e420 | 1056 | kfree(n->dev.vqs); |
d04257b0 | 1057 | kvfree(n); |
3a4d5c94 MT |
1058 | return 0; |
1059 | } | |
1060 | ||
1061 | static struct socket *get_raw_socket(int fd) | |
1062 | { | |
1063 | struct { | |
1064 | struct sockaddr_ll sa; | |
1065 | char buf[MAX_ADDR_LEN]; | |
1066 | } uaddr; | |
9b2c45d4 | 1067 | int r; |
3a4d5c94 | 1068 | struct socket *sock = sockfd_lookup(fd, &r); |
d47effe1 | 1069 | |
3a4d5c94 MT |
1070 | if (!sock) |
1071 | return ERR_PTR(-ENOTSOCK); | |
1072 | ||
1073 | /* Parameter checking */ | |
1074 | if (sock->sk->sk_type != SOCK_RAW) { | |
1075 | r = -ESOCKTNOSUPPORT; | |
1076 | goto err; | |
1077 | } | |
1078 | ||
9b2c45d4 DV |
1079 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, 0); |
1080 | if (r < 0) | |
3a4d5c94 MT |
1081 | goto err; |
1082 | ||
1083 | if (uaddr.sa.sll_family != AF_PACKET) { | |
1084 | r = -EPFNOSUPPORT; | |
1085 | goto err; | |
1086 | } | |
1087 | return sock; | |
1088 | err: | |
09aaacf0 | 1089 | sockfd_put(sock); |
3a4d5c94 MT |
1090 | return ERR_PTR(r); |
1091 | } | |
1092 | ||
5990a305 | 1093 | static struct ptr_ring *get_tap_ptr_ring(int fd) |
c67df11f | 1094 | { |
5990a305 | 1095 | struct ptr_ring *ring; |
c67df11f JW |
1096 | struct file *file = fget(fd); |
1097 | ||
1098 | if (!file) | |
1099 | return NULL; | |
5990a305 JW |
1100 | ring = tun_get_tx_ring(file); |
1101 | if (!IS_ERR(ring)) | |
c67df11f | 1102 | goto out; |
5990a305 JW |
1103 | ring = tap_get_ptr_ring(file); |
1104 | if (!IS_ERR(ring)) | |
c67df11f | 1105 | goto out; |
5990a305 | 1106 | ring = NULL; |
c67df11f JW |
1107 | out: |
1108 | fput(file); | |
5990a305 | 1109 | return ring; |
c67df11f JW |
1110 | } |
1111 | ||
501c774c | 1112 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
1113 | { |
1114 | struct file *file = fget(fd); | |
1115 | struct socket *sock; | |
d47effe1 | 1116 | |
3a4d5c94 MT |
1117 | if (!file) |
1118 | return ERR_PTR(-EBADF); | |
1119 | sock = tun_get_socket(file); | |
501c774c AB |
1120 | if (!IS_ERR(sock)) |
1121 | return sock; | |
635b8c8e | 1122 | sock = tap_get_socket(file); |
3a4d5c94 MT |
1123 | if (IS_ERR(sock)) |
1124 | fput(file); | |
1125 | return sock; | |
1126 | } | |
1127 | ||
1128 | static struct socket *get_socket(int fd) | |
1129 | { | |
1130 | struct socket *sock; | |
d47effe1 | 1131 | |
3a4d5c94 MT |
1132 | /* special case to disable backend */ |
1133 | if (fd == -1) | |
1134 | return NULL; | |
1135 | sock = get_raw_socket(fd); | |
1136 | if (!IS_ERR(sock)) | |
1137 | return sock; | |
501c774c | 1138 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
1139 | if (!IS_ERR(sock)) |
1140 | return sock; | |
1141 | return ERR_PTR(-ENOTSOCK); | |
1142 | } | |
1143 | ||
1144 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
1145 | { | |
1146 | struct socket *sock, *oldsock; | |
1147 | struct vhost_virtqueue *vq; | |
2839400f | 1148 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 1149 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
1150 | int r; |
1151 | ||
1152 | mutex_lock(&n->dev.mutex); | |
1153 | r = vhost_dev_check_owner(&n->dev); | |
1154 | if (r) | |
1155 | goto err; | |
1156 | ||
1157 | if (index >= VHOST_NET_VQ_MAX) { | |
1158 | r = -ENOBUFS; | |
1159 | goto err; | |
1160 | } | |
3ab2e420 | 1161 | vq = &n->vqs[index].vq; |
2839400f | 1162 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
1163 | mutex_lock(&vq->mutex); |
1164 | ||
1165 | /* Verify that ring has been setup correctly. */ | |
1166 | if (!vhost_vq_access_ok(vq)) { | |
1167 | r = -EFAULT; | |
1dace8c8 | 1168 | goto err_vq; |
3a4d5c94 MT |
1169 | } |
1170 | sock = get_socket(fd); | |
1171 | if (IS_ERR(sock)) { | |
1172 | r = PTR_ERR(sock); | |
1dace8c8 | 1173 | goto err_vq; |
3a4d5c94 MT |
1174 | } |
1175 | ||
1176 | /* start polling new socket */ | |
22fa90c7 | 1177 | oldsock = vq->private_data; |
11fe8839 | 1178 | if (sock != oldsock) { |
fe729a57 AH |
1179 | ubufs = vhost_net_ubuf_alloc(vq, |
1180 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
1181 | if (IS_ERR(ubufs)) { |
1182 | r = PTR_ERR(ubufs); | |
1183 | goto err_ubufs; | |
1184 | } | |
692a998b | 1185 | |
d47effe1 | 1186 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 1187 | vq->private_data = sock; |
c67df11f | 1188 | vhost_net_buf_unproduce(nvq); |
80f7d030 | 1189 | r = vhost_vq_init_access(vq); |
f59281da | 1190 | if (r) |
692a998b | 1191 | goto err_used; |
2b8b328b JW |
1192 | r = vhost_net_enable_vq(n, vq); |
1193 | if (r) | |
1194 | goto err_used; | |
303fd71b JW |
1195 | if (index == VHOST_NET_VQ_RX) |
1196 | nvq->rx_ring = get_tap_ptr_ring(fd); | |
692a998b | 1197 | |
2839400f AH |
1198 | oldubufs = nvq->ubufs; |
1199 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
1200 | |
1201 | n->tx_packets = 0; | |
1202 | n->tx_zcopy_err = 0; | |
1280c27f | 1203 | n->tx_flush = false; |
dd1f4078 | 1204 | } |
3a4d5c94 | 1205 | |
1680e906 MT |
1206 | mutex_unlock(&vq->mutex); |
1207 | ||
c047e5f3 | 1208 | if (oldubufs) { |
c38e39c3 | 1209 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 1210 | mutex_lock(&vq->mutex); |
eaae8132 | 1211 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
1212 | mutex_unlock(&vq->mutex); |
1213 | } | |
bab632d6 | 1214 | |
3a4d5c94 MT |
1215 | if (oldsock) { |
1216 | vhost_net_flush_vq(n, index); | |
09aaacf0 | 1217 | sockfd_put(oldsock); |
3a4d5c94 | 1218 | } |
1dace8c8 | 1219 | |
1680e906 MT |
1220 | mutex_unlock(&n->dev.mutex); |
1221 | return 0; | |
1222 | ||
692a998b | 1223 | err_used: |
22fa90c7 | 1224 | vq->private_data = oldsock; |
692a998b JW |
1225 | vhost_net_enable_vq(n, vq); |
1226 | if (ubufs) | |
c38e39c3 | 1227 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 | 1228 | err_ubufs: |
b8f1f658 JW |
1229 | if (sock) |
1230 | sockfd_put(sock); | |
1dace8c8 JD |
1231 | err_vq: |
1232 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
1233 | err: |
1234 | mutex_unlock(&n->dev.mutex); | |
1235 | return r; | |
1236 | } | |
1237 | ||
1238 | static long vhost_net_reset_owner(struct vhost_net *n) | |
1239 | { | |
1240 | struct socket *tx_sock = NULL; | |
1241 | struct socket *rx_sock = NULL; | |
1242 | long err; | |
a9709d68 | 1243 | struct vhost_umem *umem; |
d47effe1 | 1244 | |
3a4d5c94 MT |
1245 | mutex_lock(&n->dev.mutex); |
1246 | err = vhost_dev_check_owner(&n->dev); | |
1247 | if (err) | |
1248 | goto done; | |
a9709d68 JW |
1249 | umem = vhost_dev_reset_owner_prepare(); |
1250 | if (!umem) { | |
150b9e51 MT |
1251 | err = -ENOMEM; |
1252 | goto done; | |
1253 | } | |
3a4d5c94 MT |
1254 | vhost_net_stop(n, &tx_sock, &rx_sock); |
1255 | vhost_net_flush(n); | |
4cd87951 | 1256 | vhost_dev_stop(&n->dev); |
a9709d68 | 1257 | vhost_dev_reset_owner(&n->dev, umem); |
81f95a55 | 1258 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
1259 | done: |
1260 | mutex_unlock(&n->dev.mutex); | |
1261 | if (tx_sock) | |
09aaacf0 | 1262 | sockfd_put(tx_sock); |
3a4d5c94 | 1263 | if (rx_sock) |
09aaacf0 | 1264 | sockfd_put(rx_sock); |
3a4d5c94 MT |
1265 | return err; |
1266 | } | |
1267 | ||
1268 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
1269 | { | |
8dd014ad | 1270 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1271 | int i; |
8dd014ad | 1272 | |
e4fca7d6 MT |
1273 | hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
1274 | (1ULL << VIRTIO_F_VERSION_1))) ? | |
8dd014ad DS |
1275 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
1276 | sizeof(struct virtio_net_hdr); | |
1277 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1278 | /* vhost provides vnet_hdr */ | |
1279 | vhost_hlen = hdr_len; | |
1280 | sock_hlen = 0; | |
1281 | } else { | |
1282 | /* socket provides vnet_hdr */ | |
1283 | vhost_hlen = 0; | |
1284 | sock_hlen = hdr_len; | |
1285 | } | |
3a4d5c94 MT |
1286 | mutex_lock(&n->dev.mutex); |
1287 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
6b1e6cc7 JW |
1288 | !vhost_log_access_ok(&n->dev)) |
1289 | goto out_unlock; | |
1290 | ||
1291 | if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) { | |
1292 | if (vhost_init_device_iotlb(&n->dev, true)) | |
1293 | goto out_unlock; | |
3a4d5c94 | 1294 | } |
6b1e6cc7 | 1295 | |
3a4d5c94 | 1296 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
3ab2e420 | 1297 | mutex_lock(&n->vqs[i].vq.mutex); |
ea16c514 | 1298 | n->vqs[i].vq.acked_features = features; |
81f95a55 MT |
1299 | n->vqs[i].vhost_hlen = vhost_hlen; |
1300 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1301 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 | 1302 | } |
3a4d5c94 MT |
1303 | mutex_unlock(&n->dev.mutex); |
1304 | return 0; | |
6b1e6cc7 JW |
1305 | |
1306 | out_unlock: | |
1307 | mutex_unlock(&n->dev.mutex); | |
1308 | return -EFAULT; | |
3a4d5c94 MT |
1309 | } |
1310 | ||
b1ad8496 AH |
1311 | static long vhost_net_set_owner(struct vhost_net *n) |
1312 | { | |
1313 | int r; | |
1314 | ||
1315 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1316 | if (vhost_dev_has_owner(&n->dev)) { |
1317 | r = -EBUSY; | |
1318 | goto out; | |
1319 | } | |
b1ad8496 AH |
1320 | r = vhost_net_set_ubuf_info(n); |
1321 | if (r) | |
1322 | goto out; | |
1323 | r = vhost_dev_set_owner(&n->dev); | |
1324 | if (r) | |
1325 | vhost_net_clear_ubuf_info(n); | |
1326 | vhost_net_flush(n); | |
1327 | out: | |
1328 | mutex_unlock(&n->dev.mutex); | |
1329 | return r; | |
1330 | } | |
1331 | ||
3a4d5c94 MT |
1332 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1333 | unsigned long arg) | |
1334 | { | |
1335 | struct vhost_net *n = f->private_data; | |
1336 | void __user *argp = (void __user *)arg; | |
1337 | u64 __user *featurep = argp; | |
1338 | struct vhost_vring_file backend; | |
1339 | u64 features; | |
1340 | int r; | |
d47effe1 | 1341 | |
3a4d5c94 MT |
1342 | switch (ioctl) { |
1343 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1344 | if (copy_from_user(&backend, argp, sizeof backend)) |
1345 | return -EFAULT; | |
3a4d5c94 MT |
1346 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1347 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1348 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1349 | if (copy_to_user(featurep, &features, sizeof features)) |
1350 | return -EFAULT; | |
1351 | return 0; | |
3a4d5c94 | 1352 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1353 | if (copy_from_user(&features, featurep, sizeof features)) |
1354 | return -EFAULT; | |
0dd05a3b | 1355 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1356 | return -EOPNOTSUPP; |
1357 | return vhost_net_set_features(n, features); | |
1358 | case VHOST_RESET_OWNER: | |
1359 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1360 | case VHOST_SET_OWNER: |
1361 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1362 | default: |
1363 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1364 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1365 | if (r == -ENOIOCTLCMD) | |
1366 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1367 | else | |
1368 | vhost_net_flush(n); | |
3a4d5c94 MT |
1369 | mutex_unlock(&n->dev.mutex); |
1370 | return r; | |
1371 | } | |
1372 | } | |
1373 | ||
1374 | #ifdef CONFIG_COMPAT | |
1375 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1376 | unsigned long arg) | |
1377 | { | |
1378 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1379 | } | |
1380 | #endif | |
1381 | ||
6b1e6cc7 JW |
1382 | static ssize_t vhost_net_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1383 | { | |
1384 | struct file *file = iocb->ki_filp; | |
1385 | struct vhost_net *n = file->private_data; | |
1386 | struct vhost_dev *dev = &n->dev; | |
1387 | int noblock = file->f_flags & O_NONBLOCK; | |
1388 | ||
1389 | return vhost_chr_read_iter(dev, to, noblock); | |
1390 | } | |
1391 | ||
1392 | static ssize_t vhost_net_chr_write_iter(struct kiocb *iocb, | |
1393 | struct iov_iter *from) | |
1394 | { | |
1395 | struct file *file = iocb->ki_filp; | |
1396 | struct vhost_net *n = file->private_data; | |
1397 | struct vhost_dev *dev = &n->dev; | |
1398 | ||
1399 | return vhost_chr_write_iter(dev, from); | |
1400 | } | |
1401 | ||
afc9a42b | 1402 | static __poll_t vhost_net_chr_poll(struct file *file, poll_table *wait) |
6b1e6cc7 JW |
1403 | { |
1404 | struct vhost_net *n = file->private_data; | |
1405 | struct vhost_dev *dev = &n->dev; | |
1406 | ||
1407 | return vhost_chr_poll(file, dev, wait); | |
1408 | } | |
1409 | ||
373a83a6 | 1410 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1411 | .owner = THIS_MODULE, |
1412 | .release = vhost_net_release, | |
6b1e6cc7 JW |
1413 | .read_iter = vhost_net_chr_read_iter, |
1414 | .write_iter = vhost_net_chr_write_iter, | |
1415 | .poll = vhost_net_chr_poll, | |
3a4d5c94 MT |
1416 | .unlocked_ioctl = vhost_net_ioctl, |
1417 | #ifdef CONFIG_COMPAT | |
1418 | .compat_ioctl = vhost_net_compat_ioctl, | |
1419 | #endif | |
1420 | .open = vhost_net_open, | |
6038f373 | 1421 | .llseek = noop_llseek, |
3a4d5c94 MT |
1422 | }; |
1423 | ||
1424 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1425 | .minor = VHOST_NET_MINOR, |
1426 | .name = "vhost-net", | |
1427 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1428 | }; |
1429 | ||
a8d3782f | 1430 | static int vhost_net_init(void) |
3a4d5c94 | 1431 | { |
bab632d6 | 1432 | if (experimental_zcopytx) |
fe729a57 | 1433 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1434 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1435 | } |
1436 | module_init(vhost_net_init); | |
1437 | ||
a8d3782f | 1438 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1439 | { |
1440 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1441 | } |
1442 | module_exit(vhost_net_exit); | |
1443 | ||
1444 | MODULE_VERSION("0.0.1"); | |
1445 | MODULE_LICENSE("GPL v2"); | |
1446 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1447 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1448 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1449 | MODULE_ALIAS("devname:vhost-net"); |