Commit | Line | Data |
---|---|---|
3a4d5c94 MT |
1 | /* Copyright (C) 2009 Red Hat, Inc. |
2 | * Author: Michael S. Tsirkin <mst@redhat.com> | |
3 | * | |
4 | * This work is licensed under the terms of the GNU GPL, version 2. | |
5 | * | |
6 | * virtio-net server in host kernel. | |
7 | */ | |
8 | ||
9 | #include <linux/compat.h> | |
10 | #include <linux/eventfd.h> | |
11 | #include <linux/vhost.h> | |
12 | #include <linux/virtio_net.h> | |
3a4d5c94 MT |
13 | #include <linux/miscdevice.h> |
14 | #include <linux/module.h> | |
bab632d6 | 15 | #include <linux/moduleparam.h> |
3a4d5c94 MT |
16 | #include <linux/mutex.h> |
17 | #include <linux/workqueue.h> | |
3a4d5c94 | 18 | #include <linux/file.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
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> | |
35 | ||
36 | #include "vhost.h" | |
37 | ||
f9611c43 | 38 | static int experimental_zcopytx = 1; |
bab632d6 | 39 | module_param(experimental_zcopytx, int, 0444); |
f9611c43 MT |
40 | MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;" |
41 | " 1 -Enable; 0 - Disable"); | |
bab632d6 | 42 | |
3a4d5c94 MT |
43 | /* Max number of bytes transferred before requeueing the job. |
44 | * Using this limit prevents one virtqueue from starving others. */ | |
45 | #define VHOST_NET_WEIGHT 0x80000 | |
46 | ||
a2ac9990 | 47 | /* Max number of packets transferred before requeueing the job. |
48 | * Using this limit prevents one virtqueue from starving rx. */ | |
49 | #define VHOST_NET_PKT_WEIGHT(vq) ((vq)->num * 2) | |
50 | ||
bab632d6 MT |
51 | /* MAX number of TX used buffers for outstanding zerocopy */ |
52 | #define VHOST_MAX_PEND 128 | |
53 | #define VHOST_GOODCOPY_LEN 256 | |
54 | ||
eaae8132 MT |
55 | /* |
56 | * For transmit, used buffer len is unused; we override it to track buffer | |
57 | * status internally; used for zerocopy tx only. | |
58 | */ | |
59 | /* Lower device DMA failed */ | |
bf995734 | 60 | #define VHOST_DMA_FAILED_LEN ((__force __virtio32)3) |
eaae8132 | 61 | /* Lower device DMA done */ |
bf995734 | 62 | #define VHOST_DMA_DONE_LEN ((__force __virtio32)2) |
eaae8132 | 63 | /* Lower device DMA in progress */ |
bf995734 | 64 | #define VHOST_DMA_IN_PROGRESS ((__force __virtio32)1) |
eaae8132 | 65 | /* Buffer unused */ |
bf995734 | 66 | #define VHOST_DMA_CLEAR_LEN ((__force __virtio32)0) |
eaae8132 | 67 | |
bf995734 | 68 | #define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force u32)VHOST_DMA_DONE_LEN) |
eaae8132 | 69 | |
8570a6e7 AH |
70 | enum { |
71 | VHOST_NET_FEATURES = VHOST_FEATURES | | |
72 | (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) | | |
6b1e6cc7 JW |
73 | (1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
74 | (1ULL << VIRTIO_F_IOMMU_PLATFORM) | |
8570a6e7 AH |
75 | }; |
76 | ||
3a4d5c94 MT |
77 | enum { |
78 | VHOST_NET_VQ_RX = 0, | |
79 | VHOST_NET_VQ_TX = 1, | |
80 | VHOST_NET_VQ_MAX = 2, | |
81 | }; | |
82 | ||
fe729a57 | 83 | struct vhost_net_ubuf_ref { |
0ad8b480 MT |
84 | /* refcount follows semantics similar to kref: |
85 | * 0: object is released | |
86 | * 1: no outstanding ubufs | |
87 | * >1: outstanding ubufs | |
88 | */ | |
89 | atomic_t refcount; | |
2839400f AH |
90 | wait_queue_head_t wait; |
91 | struct vhost_virtqueue *vq; | |
92 | }; | |
93 | ||
c67df11f JW |
94 | #define VHOST_RX_BATCH 64 |
95 | struct vhost_net_buf { | |
5990a305 | 96 | void **queue; |
c67df11f JW |
97 | int tail; |
98 | int head; | |
99 | }; | |
100 | ||
3ab2e420 AH |
101 | struct vhost_net_virtqueue { |
102 | struct vhost_virtqueue vq; | |
81f95a55 MT |
103 | size_t vhost_hlen; |
104 | size_t sock_hlen; | |
2839400f AH |
105 | /* vhost zerocopy support fields below: */ |
106 | /* last used idx for outstanding DMA zerocopy buffers */ | |
107 | int upend_idx; | |
108 | /* first used idx for DMA done zerocopy buffers */ | |
109 | int done_idx; | |
110 | /* an array of userspace buffers info */ | |
111 | struct ubuf_info *ubuf_info; | |
112 | /* Reference counting for outstanding ubufs. | |
113 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 114 | struct vhost_net_ubuf_ref *ubufs; |
5990a305 | 115 | struct ptr_ring *rx_ring; |
c67df11f | 116 | struct vhost_net_buf rxq; |
3ab2e420 AH |
117 | }; |
118 | ||
3a4d5c94 MT |
119 | struct vhost_net { |
120 | struct vhost_dev dev; | |
3ab2e420 | 121 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 122 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
123 | /* Number of TX recently submitted. |
124 | * Protected by tx vq lock. */ | |
125 | unsigned tx_packets; | |
126 | /* Number of times zerocopy TX recently failed. | |
127 | * Protected by tx vq lock. */ | |
128 | unsigned tx_zcopy_err; | |
1280c27f MT |
129 | /* Flush in progress. Protected by tx vq lock. */ |
130 | bool tx_flush; | |
3a4d5c94 MT |
131 | }; |
132 | ||
fe729a57 | 133 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 134 | |
c67df11f JW |
135 | static void *vhost_net_buf_get_ptr(struct vhost_net_buf *rxq) |
136 | { | |
137 | if (rxq->tail != rxq->head) | |
138 | return rxq->queue[rxq->head]; | |
139 | else | |
140 | return NULL; | |
141 | } | |
142 | ||
143 | static int vhost_net_buf_get_size(struct vhost_net_buf *rxq) | |
144 | { | |
145 | return rxq->tail - rxq->head; | |
146 | } | |
147 | ||
148 | static int vhost_net_buf_is_empty(struct vhost_net_buf *rxq) | |
149 | { | |
150 | return rxq->tail == rxq->head; | |
151 | } | |
152 | ||
153 | static void *vhost_net_buf_consume(struct vhost_net_buf *rxq) | |
154 | { | |
155 | void *ret = vhost_net_buf_get_ptr(rxq); | |
156 | ++rxq->head; | |
157 | return ret; | |
158 | } | |
159 | ||
160 | static int vhost_net_buf_produce(struct vhost_net_virtqueue *nvq) | |
161 | { | |
162 | struct vhost_net_buf *rxq = &nvq->rxq; | |
163 | ||
164 | rxq->head = 0; | |
5990a305 | 165 | rxq->tail = ptr_ring_consume_batched(nvq->rx_ring, rxq->queue, |
c67df11f JW |
166 | VHOST_RX_BATCH); |
167 | return rxq->tail; | |
168 | } | |
169 | ||
170 | static void vhost_net_buf_unproduce(struct vhost_net_virtqueue *nvq) | |
171 | { | |
172 | struct vhost_net_buf *rxq = &nvq->rxq; | |
173 | ||
5990a305 JW |
174 | if (nvq->rx_ring && !vhost_net_buf_is_empty(rxq)) { |
175 | ptr_ring_unconsume(nvq->rx_ring, rxq->queue + rxq->head, | |
176 | vhost_net_buf_get_size(rxq), | |
3a403076 | 177 | tun_ptr_free); |
c67df11f JW |
178 | rxq->head = rxq->tail = 0; |
179 | } | |
180 | } | |
181 | ||
fc72d1d5 JW |
182 | static int vhost_net_buf_peek_len(void *ptr) |
183 | { | |
184 | if (tun_is_xdp_buff(ptr)) { | |
185 | struct xdp_buff *xdp = tun_ptr_to_xdp(ptr); | |
186 | ||
187 | return xdp->data_end - xdp->data; | |
188 | } | |
189 | ||
190 | return __skb_array_len_with_tag(ptr); | |
191 | } | |
192 | ||
c67df11f JW |
193 | static int vhost_net_buf_peek(struct vhost_net_virtqueue *nvq) |
194 | { | |
195 | struct vhost_net_buf *rxq = &nvq->rxq; | |
196 | ||
197 | if (!vhost_net_buf_is_empty(rxq)) | |
198 | goto out; | |
199 | ||
200 | if (!vhost_net_buf_produce(nvq)) | |
201 | return 0; | |
202 | ||
203 | out: | |
fc72d1d5 | 204 | return vhost_net_buf_peek_len(vhost_net_buf_get_ptr(rxq)); |
c67df11f JW |
205 | } |
206 | ||
207 | static void vhost_net_buf_init(struct vhost_net_buf *rxq) | |
208 | { | |
209 | rxq->head = rxq->tail = 0; | |
210 | } | |
211 | ||
fe729a57 | 212 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 213 | { |
fe729a57 | 214 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
215 | } |
216 | ||
fe729a57 AH |
217 | static struct vhost_net_ubuf_ref * |
218 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 219 | { |
fe729a57 | 220 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
221 | /* No zero copy backend? Nothing to count. */ |
222 | if (!zcopy) | |
223 | return NULL; | |
224 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
225 | if (!ubufs) | |
226 | return ERR_PTR(-ENOMEM); | |
0ad8b480 | 227 | atomic_set(&ubufs->refcount, 1); |
2839400f AH |
228 | init_waitqueue_head(&ubufs->wait); |
229 | ubufs->vq = vq; | |
230 | return ubufs; | |
231 | } | |
232 | ||
0ad8b480 | 233 | static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 234 | { |
0ad8b480 MT |
235 | int r = atomic_sub_return(1, &ubufs->refcount); |
236 | if (unlikely(!r)) | |
237 | wake_up(&ubufs->wait); | |
238 | return r; | |
2839400f AH |
239 | } |
240 | ||
fe729a57 | 241 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 242 | { |
0ad8b480 MT |
243 | vhost_net_ubuf_put(ubufs); |
244 | wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); | |
c38e39c3 MT |
245 | } |
246 | ||
247 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
248 | { | |
249 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
250 | kfree(ubufs); |
251 | } | |
252 | ||
b1ad8496 AH |
253 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
254 | { | |
b1ad8496 AH |
255 | int i; |
256 | ||
288cfe78 MT |
257 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
258 | kfree(n->vqs[i].ubuf_info); | |
259 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
260 | } |
261 | } | |
262 | ||
0a1febf7 | 263 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
264 | { |
265 | bool zcopy; | |
266 | int i; | |
267 | ||
288cfe78 | 268 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 269 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
270 | if (!zcopy) |
271 | continue; | |
272 | n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) * | |
273 | UIO_MAXIOV, GFP_KERNEL); | |
274 | if (!n->vqs[i].ubuf_info) | |
275 | goto err; | |
276 | } | |
277 | return 0; | |
278 | ||
279 | err: | |
288cfe78 | 280 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
281 | return -ENOMEM; |
282 | } | |
283 | ||
0a1febf7 | 284 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
285 | { |
286 | int i; | |
287 | ||
288cfe78 MT |
288 | vhost_net_clear_ubuf_info(n); |
289 | ||
2839400f AH |
290 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
291 | n->vqs[i].done_idx = 0; | |
292 | n->vqs[i].upend_idx = 0; | |
293 | n->vqs[i].ubufs = NULL; | |
81f95a55 MT |
294 | n->vqs[i].vhost_hlen = 0; |
295 | n->vqs[i].sock_hlen = 0; | |
c67df11f | 296 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f AH |
297 | } |
298 | ||
299 | } | |
300 | ||
eaae8132 MT |
301 | static void vhost_net_tx_packet(struct vhost_net *net) |
302 | { | |
303 | ++net->tx_packets; | |
304 | if (net->tx_packets < 1024) | |
305 | return; | |
306 | net->tx_packets = 0; | |
307 | net->tx_zcopy_err = 0; | |
308 | } | |
309 | ||
310 | static void vhost_net_tx_err(struct vhost_net *net) | |
311 | { | |
312 | ++net->tx_zcopy_err; | |
313 | } | |
314 | ||
315 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
316 | { | |
1280c27f MT |
317 | /* TX flush waits for outstanding DMAs to be done. |
318 | * Don't start new DMAs. | |
319 | */ | |
320 | return !net->tx_flush && | |
321 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
322 | } |
323 | ||
bab632d6 MT |
324 | static bool vhost_sock_zcopy(struct socket *sock) |
325 | { | |
326 | return unlikely(experimental_zcopytx) && | |
327 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
328 | } | |
329 | ||
b211616d MT |
330 | /* In case of DMA done not in order in lower device driver for some reason. |
331 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
332 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
333 | * guest used idx. | |
334 | */ | |
094afe7d JW |
335 | static void vhost_zerocopy_signal_used(struct vhost_net *net, |
336 | struct vhost_virtqueue *vq) | |
b211616d | 337 | { |
2839400f AH |
338 | struct vhost_net_virtqueue *nvq = |
339 | container_of(vq, struct vhost_net_virtqueue, vq); | |
c92112ae | 340 | int i, add; |
b211616d MT |
341 | int j = 0; |
342 | ||
2839400f | 343 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
344 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
345 | vhost_net_tx_err(net); | |
b211616d MT |
346 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
347 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
b211616d MT |
348 | ++j; |
349 | } else | |
350 | break; | |
351 | } | |
c92112ae JW |
352 | while (j) { |
353 | add = min(UIO_MAXIOV - nvq->done_idx, j); | |
354 | vhost_add_used_and_signal_n(vq->dev, vq, | |
355 | &vq->heads[nvq->done_idx], add); | |
356 | nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; | |
357 | j -= add; | |
358 | } | |
b211616d MT |
359 | } |
360 | ||
eaae8132 | 361 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 362 | { |
fe729a57 | 363 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 364 | struct vhost_virtqueue *vq = ubufs->vq; |
0ad8b480 | 365 | int cnt; |
24eb21a1 | 366 | |
b0c057ca MT |
367 | rcu_read_lock_bh(); |
368 | ||
19c73b3e JW |
369 | /* set len to mark this desc buffers done DMA */ |
370 | vq->heads[ubuf->desc].len = success ? | |
371 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
0ad8b480 | 372 | cnt = vhost_net_ubuf_put(ubufs); |
19c73b3e | 373 | |
24eb21a1 MT |
374 | /* |
375 | * Trigger polling thread if guest stopped submitting new buffers: | |
0ad8b480 | 376 | * in this case, the refcount after decrement will eventually reach 1. |
24eb21a1 MT |
377 | * We also trigger polling periodically after each 16 packets |
378 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
379 | * less than 10% of times). | |
380 | */ | |
0ad8b480 | 381 | if (cnt <= 1 || !(cnt % 16)) |
24eb21a1 | 382 | vhost_poll_queue(&vq->poll); |
b0c057ca MT |
383 | |
384 | rcu_read_unlock_bh(); | |
b211616d MT |
385 | } |
386 | ||
03088137 JW |
387 | static inline unsigned long busy_clock(void) |
388 | { | |
389 | return local_clock() >> 10; | |
390 | } | |
391 | ||
392 | static bool vhost_can_busy_poll(struct vhost_dev *dev, | |
393 | unsigned long endtime) | |
394 | { | |
395 | return likely(!need_resched()) && | |
396 | likely(!time_after(busy_clock(), endtime)) && | |
397 | likely(!signal_pending(current)) && | |
398 | !vhost_has_work(dev); | |
399 | } | |
400 | ||
8241a1e4 JW |
401 | static void vhost_net_disable_vq(struct vhost_net *n, |
402 | struct vhost_virtqueue *vq) | |
403 | { | |
404 | struct vhost_net_virtqueue *nvq = | |
405 | container_of(vq, struct vhost_net_virtqueue, vq); | |
406 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
407 | if (!vq->private_data) | |
408 | return; | |
409 | vhost_poll_stop(poll); | |
410 | } | |
411 | ||
412 | static int vhost_net_enable_vq(struct vhost_net *n, | |
413 | struct vhost_virtqueue *vq) | |
414 | { | |
415 | struct vhost_net_virtqueue *nvq = | |
416 | container_of(vq, struct vhost_net_virtqueue, vq); | |
417 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
418 | struct socket *sock; | |
419 | ||
420 | sock = vq->private_data; | |
421 | if (!sock) | |
422 | return 0; | |
423 | ||
424 | return vhost_poll_start(poll, sock->file); | |
425 | } | |
426 | ||
03088137 JW |
427 | static int vhost_net_tx_get_vq_desc(struct vhost_net *net, |
428 | struct vhost_virtqueue *vq, | |
429 | struct iovec iov[], unsigned int iov_size, | |
430 | unsigned int *out_num, unsigned int *in_num) | |
431 | { | |
432 | unsigned long uninitialized_var(endtime); | |
433 | int r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 434 | out_num, in_num, NULL, NULL); |
03088137 JW |
435 | |
436 | if (r == vq->num && vq->busyloop_timeout) { | |
437 | preempt_disable(); | |
438 | endtime = busy_clock() + vq->busyloop_timeout; | |
439 | while (vhost_can_busy_poll(vq->dev, endtime) && | |
440 | vhost_vq_avail_empty(vq->dev, vq)) | |
f2f09a4c | 441 | cpu_relax(); |
03088137 JW |
442 | preempt_enable(); |
443 | r = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), | |
6b1e6cc7 | 444 | out_num, in_num, NULL, NULL); |
03088137 JW |
445 | } |
446 | ||
447 | return r; | |
448 | } | |
449 | ||
0ed005ce JW |
450 | static bool vhost_exceeds_maxpend(struct vhost_net *net) |
451 | { | |
452 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
453 | struct vhost_virtqueue *vq = &nvq->vq; | |
454 | ||
1e6f7453 WB |
455 | return (nvq->upend_idx + UIO_MAXIOV - nvq->done_idx) % UIO_MAXIOV > |
456 | min_t(unsigned int, VHOST_MAX_PEND, vq->num >> 2); | |
0ed005ce JW |
457 | } |
458 | ||
3a4d5c94 MT |
459 | /* Expects to be always run from workqueue - which acts as |
460 | * read-size critical section for our kind of RCU. */ | |
461 | static void handle_tx(struct vhost_net *net) | |
462 | { | |
2839400f | 463 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 464 | struct vhost_virtqueue *vq = &nvq->vq; |
98a527aa | 465 | unsigned out, in; |
d5675bd2 | 466 | int head; |
3a4d5c94 MT |
467 | struct msghdr msg = { |
468 | .msg_name = NULL, | |
469 | .msg_namelen = 0, | |
470 | .msg_control = NULL, | |
471 | .msg_controllen = 0, | |
3a4d5c94 MT |
472 | .msg_flags = MSG_DONTWAIT, |
473 | }; | |
474 | size_t len, total_len = 0; | |
70181d51 | 475 | int err; |
3a4d5c94 | 476 | size_t hdr_size; |
28457ee6 | 477 | struct socket *sock; |
fe729a57 | 478 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); |
cedb9bdc | 479 | bool zcopy, zcopy_used; |
a2ac9990 | 480 | int sent_pkts = 0; |
28457ee6 | 481 | |
2e26af79 AH |
482 | mutex_lock(&vq->mutex); |
483 | sock = vq->private_data; | |
3a4d5c94 | 484 | if (!sock) |
2e26af79 | 485 | goto out; |
3a4d5c94 | 486 | |
6b1e6cc7 JW |
487 | if (!vq_iotlb_prefetch(vq)) |
488 | goto out; | |
489 | ||
8ea8cf89 | 490 | vhost_disable_notify(&net->dev, vq); |
feb8892c | 491 | vhost_net_disable_vq(net, vq); |
3a4d5c94 | 492 | |
81f95a55 | 493 | hdr_size = nvq->vhost_hlen; |
2839400f | 494 | zcopy = nvq->ubufs; |
3a4d5c94 MT |
495 | |
496 | for (;;) { | |
bab632d6 MT |
497 | /* Release DMAs done buffers first */ |
498 | if (zcopy) | |
eaae8132 | 499 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 500 | |
f7c6be40 | 501 | |
03088137 JW |
502 | head = vhost_net_tx_get_vq_desc(net, vq, vq->iov, |
503 | ARRAY_SIZE(vq->iov), | |
504 | &out, &in); | |
d5675bd2 | 505 | /* On error, stop handling until the next kick. */ |
7b3384fc | 506 | if (unlikely(head < 0)) |
d5675bd2 | 507 | break; |
3a4d5c94 MT |
508 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
509 | if (head == vq->num) { | |
8ea8cf89 MT |
510 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
511 | vhost_disable_notify(&net->dev, vq); | |
3a4d5c94 MT |
512 | continue; |
513 | } | |
514 | break; | |
515 | } | |
516 | if (in) { | |
517 | vq_err(vq, "Unexpected descriptor format for TX: " | |
518 | "out %d, int %d\n", out, in); | |
519 | break; | |
520 | } | |
521 | /* Skip header. TODO: support TSO. */ | |
3a4d5c94 | 522 | len = iov_length(vq->iov, out); |
c0371da6 | 523 | iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len); |
98a527aa | 524 | iov_iter_advance(&msg.msg_iter, hdr_size); |
3a4d5c94 | 525 | /* Sanity check */ |
01e97e65 | 526 | if (!msg_data_left(&msg)) { |
3a4d5c94 MT |
527 | vq_err(vq, "Unexpected header len for TX: " |
528 | "%zd expected %zd\n", | |
98a527aa | 529 | len, hdr_size); |
3a4d5c94 MT |
530 | break; |
531 | } | |
01e97e65 | 532 | len = msg_data_left(&msg); |
ce21a029 JW |
533 | |
534 | zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN | |
1e6f7453 | 535 | && !vhost_exceeds_maxpend(net) |
ce21a029 | 536 | && vhost_net_tx_select_zcopy(net); |
cedb9bdc | 537 | |
bab632d6 | 538 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 539 | if (zcopy_used) { |
ce21a029 JW |
540 | struct ubuf_info *ubuf; |
541 | ubuf = nvq->ubuf_info + nvq->upend_idx; | |
542 | ||
8b38694a | 543 | vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); |
ce21a029 JW |
544 | vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; |
545 | ubuf->callback = vhost_zerocopy_callback; | |
546 | ubuf->ctx = nvq->ubufs; | |
547 | ubuf->desc = nvq->upend_idx; | |
c1d1b437 | 548 | refcount_set(&ubuf->refcnt, 1); |
ce21a029 JW |
549 | msg.msg_control = ubuf; |
550 | msg.msg_controllen = sizeof(ubuf); | |
551 | ubufs = nvq->ubufs; | |
0ad8b480 | 552 | atomic_inc(&ubufs->refcount); |
2839400f | 553 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
ce21a029 | 554 | } else { |
4364d5f9 | 555 | msg.msg_control = NULL; |
ce21a029 JW |
556 | ubufs = NULL; |
557 | } | |
0ed005ce JW |
558 | |
559 | total_len += len; | |
560 | if (total_len < VHOST_NET_WEIGHT && | |
561 | !vhost_vq_avail_empty(&net->dev, vq) && | |
562 | likely(!vhost_exceeds_maxpend(net))) { | |
563 | msg.msg_flags |= MSG_MORE; | |
564 | } else { | |
565 | msg.msg_flags &= ~MSG_MORE; | |
566 | } | |
567 | ||
3a4d5c94 | 568 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
1b784140 | 569 | err = sock->ops->sendmsg(sock, &msg, len); |
3a4d5c94 | 570 | if (unlikely(err < 0)) { |
cedb9bdc | 571 | if (zcopy_used) { |
ce21a029 | 572 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
573 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
574 | % UIO_MAXIOV; | |
bab632d6 | 575 | } |
8dd014ad | 576 | vhost_discard_vq_desc(vq, 1); |
feb8892c | 577 | vhost_net_enable_vq(net, vq); |
3a4d5c94 MT |
578 | break; |
579 | } | |
580 | if (err != len) | |
95c0ec6a MT |
581 | pr_debug("Truncated TX packet: " |
582 | " len %d != %zd\n", err, len); | |
cedb9bdc | 583 | if (!zcopy_used) |
bab632d6 | 584 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 585 | else |
eaae8132 | 586 | vhost_zerocopy_signal_used(net, vq); |
eaae8132 | 587 | vhost_net_tx_packet(net); |
a2ac9990 | 588 | if (unlikely(total_len >= VHOST_NET_WEIGHT) || |
589 | unlikely(++sent_pkts >= VHOST_NET_PKT_WEIGHT(vq))) { | |
3a4d5c94 MT |
590 | vhost_poll_queue(&vq->poll); |
591 | break; | |
592 | } | |
593 | } | |
2e26af79 | 594 | out: |
3a4d5c94 | 595 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
596 | } |
597 | ||
c67df11f | 598 | static int peek_head_len(struct vhost_net_virtqueue *rvq, struct sock *sk) |
8dd014ad DS |
599 | { |
600 | struct sk_buff *head; | |
601 | int len = 0; | |
783e3988 | 602 | unsigned long flags; |
8dd014ad | 603 | |
5990a305 | 604 | if (rvq->rx_ring) |
c67df11f | 605 | return vhost_net_buf_peek(rvq); |
1576d986 | 606 | |
783e3988 | 607 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 608 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 609 | if (likely(head)) { |
8dd014ad | 610 | len = head->len; |
df8a39de | 611 | if (skb_vlan_tag_present(head)) |
c53cff5e BG |
612 | len += VLAN_HLEN; |
613 | } | |
614 | ||
783e3988 | 615 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
616 | return len; |
617 | } | |
618 | ||
1576d986 JW |
619 | static int sk_has_rx_data(struct sock *sk) |
620 | { | |
621 | struct socket *sock = sk->sk_socket; | |
622 | ||
623 | if (sock->ops->peek_len) | |
624 | return sock->ops->peek_len(sock); | |
625 | ||
626 | return skb_queue_empty(&sk->sk_receive_queue); | |
627 | } | |
628 | ||
03088137 JW |
629 | static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk) |
630 | { | |
c67df11f | 631 | struct vhost_net_virtqueue *rvq = &net->vqs[VHOST_NET_VQ_RX]; |
03088137 JW |
632 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
633 | struct vhost_virtqueue *vq = &nvq->vq; | |
634 | unsigned long uninitialized_var(endtime); | |
c67df11f | 635 | int len = peek_head_len(rvq, sk); |
03088137 JW |
636 | |
637 | if (!len && vq->busyloop_timeout) { | |
638 | /* Both tx vq and rx socket were polled here */ | |
aaa3149b | 639 | mutex_lock_nested(&vq->mutex, 1); |
03088137 JW |
640 | vhost_disable_notify(&net->dev, vq); |
641 | ||
642 | preempt_disable(); | |
643 | endtime = busy_clock() + vq->busyloop_timeout; | |
644 | ||
645 | while (vhost_can_busy_poll(&net->dev, endtime) && | |
1576d986 | 646 | !sk_has_rx_data(sk) && |
03088137 | 647 | vhost_vq_avail_empty(&net->dev, vq)) |
f2f09a4c | 648 | cpu_relax(); |
03088137 JW |
649 | |
650 | preempt_enable(); | |
651 | ||
8b949bef | 652 | if (!vhost_vq_avail_empty(&net->dev, vq)) |
03088137 | 653 | vhost_poll_queue(&vq->poll); |
8b949bef JW |
654 | else if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
655 | vhost_disable_notify(&net->dev, vq); | |
656 | vhost_poll_queue(&vq->poll); | |
657 | } | |
658 | ||
03088137 JW |
659 | mutex_unlock(&vq->mutex); |
660 | ||
c67df11f | 661 | len = peek_head_len(rvq, sk); |
03088137 JW |
662 | } |
663 | ||
664 | return len; | |
665 | } | |
666 | ||
8dd014ad DS |
667 | /* This is a multi-buffer version of vhost_get_desc, that works if |
668 | * vq has read descriptors only. | |
669 | * @vq - the relevant virtqueue | |
670 | * @datalen - data length we'll be reading | |
671 | * @iovcount - returned count of io vectors we fill | |
672 | * @log - vhost log | |
673 | * @log_num - log offset | |
94249369 | 674 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
675 | * returns number of buffer heads allocated, negative on error |
676 | */ | |
677 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
678 | struct vring_used_elem *heads, | |
679 | int datalen, | |
680 | unsigned *iovcount, | |
681 | struct vhost_log *log, | |
94249369 JW |
682 | unsigned *log_num, |
683 | unsigned int quota) | |
8dd014ad DS |
684 | { |
685 | unsigned int out, in; | |
686 | int seg = 0; | |
687 | int headcount = 0; | |
688 | unsigned d; | |
689 | int r, nlogs = 0; | |
8b38694a MT |
690 | /* len is always initialized before use since we are always called with |
691 | * datalen > 0. | |
692 | */ | |
693 | u32 uninitialized_var(len); | |
8dd014ad | 694 | |
94249369 | 695 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 696 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
697 | r = -ENOBUFS; |
698 | goto err; | |
699 | } | |
47283bef | 700 | r = vhost_get_vq_desc(vq, vq->iov + seg, |
8dd014ad DS |
701 | ARRAY_SIZE(vq->iov) - seg, &out, |
702 | &in, log, log_num); | |
a39ee449 MT |
703 | if (unlikely(r < 0)) |
704 | goto err; | |
705 | ||
706 | d = r; | |
8dd014ad DS |
707 | if (d == vq->num) { |
708 | r = 0; | |
709 | goto err; | |
710 | } | |
711 | if (unlikely(out || in <= 0)) { | |
712 | vq_err(vq, "unexpected descriptor format for RX: " | |
713 | "out %d, in %d\n", out, in); | |
714 | r = -EINVAL; | |
715 | goto err; | |
716 | } | |
717 | if (unlikely(log)) { | |
718 | nlogs += *log_num; | |
719 | log += *log_num; | |
720 | } | |
8b38694a MT |
721 | heads[headcount].id = cpu_to_vhost32(vq, d); |
722 | len = iov_length(vq->iov + seg, in); | |
723 | heads[headcount].len = cpu_to_vhost32(vq, len); | |
724 | datalen -= len; | |
8dd014ad DS |
725 | ++headcount; |
726 | seg += in; | |
727 | } | |
99975cc6 | 728 | heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); |
8dd014ad DS |
729 | *iovcount = seg; |
730 | if (unlikely(log)) | |
731 | *log_num = nlogs; | |
d8316f39 MT |
732 | |
733 | /* Detect overrun */ | |
734 | if (unlikely(datalen > 0)) { | |
735 | r = UIO_MAXIOV + 1; | |
736 | goto err; | |
737 | } | |
8dd014ad DS |
738 | return headcount; |
739 | err: | |
740 | vhost_discard_vq_desc(vq, headcount); | |
741 | return r; | |
742 | } | |
743 | ||
3a4d5c94 MT |
744 | /* Expects to be always run from workqueue - which acts as |
745 | * read-size critical section for our kind of RCU. */ | |
94249369 | 746 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 747 | { |
81f95a55 MT |
748 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
749 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
750 | unsigned uninitialized_var(in), log; |
751 | struct vhost_log *vq_log; | |
752 | struct msghdr msg = { | |
753 | .msg_name = NULL, | |
754 | .msg_namelen = 0, | |
755 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
756 | .msg_controllen = 0, | |
8dd014ad DS |
757 | .msg_flags = MSG_DONTWAIT, |
758 | }; | |
0960b641 JW |
759 | struct virtio_net_hdr hdr = { |
760 | .flags = 0, | |
761 | .gso_type = VIRTIO_NET_HDR_GSO_NONE | |
8dd014ad | 762 | }; |
8dd014ad | 763 | size_t total_len = 0; |
910a578f | 764 | int err, mergeable; |
e2b3b35e | 765 | s16 headcount, nheads = 0; |
8dd014ad DS |
766 | size_t vhost_hlen, sock_hlen; |
767 | size_t vhost_len, sock_len; | |
2e26af79 | 768 | struct socket *sock; |
ba7438ae | 769 | struct iov_iter fixup; |
0960b641 | 770 | __virtio16 num_buffers; |
8dd014ad | 771 | |
aaa3149b | 772 | mutex_lock_nested(&vq->mutex, 0); |
2e26af79 AH |
773 | sock = vq->private_data; |
774 | if (!sock) | |
775 | goto out; | |
6b1e6cc7 JW |
776 | |
777 | if (!vq_iotlb_prefetch(vq)) | |
778 | goto out; | |
779 | ||
8ea8cf89 | 780 | vhost_disable_notify(&net->dev, vq); |
8241a1e4 | 781 | vhost_net_disable_vq(net, vq); |
2e26af79 | 782 | |
81f95a55 MT |
783 | vhost_hlen = nvq->vhost_hlen; |
784 | sock_hlen = nvq->sock_hlen; | |
8dd014ad | 785 | |
ea16c514 | 786 | vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ? |
8dd014ad | 787 | vq->log : NULL; |
ea16c514 | 788 | mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad | 789 | |
03088137 | 790 | while ((sock_len = vhost_net_rx_peek_head_len(net, sock->sk))) { |
8dd014ad DS |
791 | sock_len += sock_hlen; |
792 | vhost_len = sock_len + vhost_hlen; | |
e2b3b35e | 793 | headcount = get_rx_bufs(vq, vq->heads + nheads, vhost_len, |
94249369 JW |
794 | &in, vq_log, &log, |
795 | likely(mergeable) ? UIO_MAXIOV : 1); | |
8dd014ad DS |
796 | /* On error, stop handling until the next kick. */ |
797 | if (unlikely(headcount < 0)) | |
8241a1e4 | 798 | goto out; |
8dd014ad DS |
799 | /* OK, now we need to know about added descriptors. */ |
800 | if (!headcount) { | |
8ea8cf89 | 801 | if (unlikely(vhost_enable_notify(&net->dev, vq))) { |
8dd014ad DS |
802 | /* They have slipped one in as we were |
803 | * doing that: check again. */ | |
8ea8cf89 | 804 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
805 | continue; |
806 | } | |
807 | /* Nothing new? Wait for eventfd to tell us | |
808 | * they refilled. */ | |
8241a1e4 | 809 | goto out; |
8dd014ad | 810 | } |
5990a305 | 811 | if (nvq->rx_ring) |
6e474083 WX |
812 | msg.msg_control = vhost_net_buf_consume(&nvq->rxq); |
813 | /* On overrun, truncate and discard */ | |
814 | if (unlikely(headcount > UIO_MAXIOV)) { | |
815 | iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); | |
816 | err = sock->ops->recvmsg(sock, &msg, | |
817 | 1, MSG_DONTWAIT | MSG_TRUNC); | |
818 | pr_debug("Discarded rx packet: len %zd\n", sock_len); | |
819 | continue; | |
820 | } | |
8dd014ad | 821 | /* We don't need to be notified again. */ |
ba7438ae AV |
822 | iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len); |
823 | fixup = msg.msg_iter; | |
824 | if (unlikely((vhost_hlen))) { | |
825 | /* We will supply the header ourselves | |
826 | * TODO: support TSO. | |
827 | */ | |
828 | iov_iter_advance(&msg.msg_iter, vhost_hlen); | |
ba7438ae | 829 | } |
1b784140 | 830 | err = sock->ops->recvmsg(sock, &msg, |
8dd014ad DS |
831 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
832 | /* Userspace might have consumed the packet meanwhile: | |
833 | * it's not supposed to do this usually, but might be hard | |
834 | * to prevent. Discard data we got (if any) and keep going. */ | |
835 | if (unlikely(err != sock_len)) { | |
836 | pr_debug("Discarded rx packet: " | |
837 | " len %d, expected %zd\n", err, sock_len); | |
838 | vhost_discard_vq_desc(vq, headcount); | |
839 | continue; | |
840 | } | |
ba7438ae | 841 | /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ |
4c5a8442 MT |
842 | if (unlikely(vhost_hlen)) { |
843 | if (copy_to_iter(&hdr, sizeof(hdr), | |
844 | &fixup) != sizeof(hdr)) { | |
845 | vq_err(vq, "Unable to write vnet_hdr " | |
846 | "at addr %p\n", vq->iov->iov_base); | |
8241a1e4 | 847 | goto out; |
4c5a8442 MT |
848 | } |
849 | } else { | |
850 | /* Header came from socket; we'll need to patch | |
851 | * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF | |
852 | */ | |
853 | iov_iter_advance(&fixup, sizeof(hdr)); | |
8dd014ad DS |
854 | } |
855 | /* TODO: Should check and handle checksum. */ | |
5201aa49 | 856 | |
0960b641 | 857 | num_buffers = cpu_to_vhost16(vq, headcount); |
cfbdab95 | 858 | if (likely(mergeable) && |
0d79a493 MT |
859 | copy_to_iter(&num_buffers, sizeof num_buffers, |
860 | &fixup) != sizeof num_buffers) { | |
8dd014ad DS |
861 | vq_err(vq, "Failed num_buffers write"); |
862 | vhost_discard_vq_desc(vq, headcount); | |
8241a1e4 | 863 | goto out; |
8dd014ad | 864 | } |
e2b3b35e JW |
865 | nheads += headcount; |
866 | if (nheads > VHOST_RX_BATCH) { | |
867 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
868 | nheads); | |
869 | nheads = 0; | |
870 | } | |
8dd014ad DS |
871 | if (unlikely(vq_log)) |
872 | vhost_log_write(vq, vq_log, log, vhost_len); | |
873 | total_len += vhost_len; | |
874 | if (unlikely(total_len >= VHOST_NET_WEIGHT)) { | |
875 | vhost_poll_queue(&vq->poll); | |
8241a1e4 | 876 | goto out; |
8dd014ad DS |
877 | } |
878 | } | |
8241a1e4 | 879 | vhost_net_enable_vq(net, vq); |
2e26af79 | 880 | out: |
e2b3b35e JW |
881 | if (nheads) |
882 | vhost_add_used_and_signal_n(&net->dev, vq, vq->heads, | |
883 | nheads); | |
8dd014ad | 884 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
885 | } |
886 | ||
c23f3445 | 887 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 888 | { |
c23f3445 TH |
889 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
890 | poll.work); | |
891 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
892 | ||
3a4d5c94 MT |
893 | handle_tx(net); |
894 | } | |
895 | ||
c23f3445 | 896 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 897 | { |
c23f3445 TH |
898 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
899 | poll.work); | |
900 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
901 | ||
3a4d5c94 MT |
902 | handle_rx(net); |
903 | } | |
904 | ||
c23f3445 | 905 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 906 | { |
c23f3445 TH |
907 | struct vhost_net *net = container_of(work, struct vhost_net, |
908 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
909 | handle_tx(net); |
910 | } | |
911 | ||
c23f3445 | 912 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 913 | { |
c23f3445 TH |
914 | struct vhost_net *net = container_of(work, struct vhost_net, |
915 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
916 | handle_rx(net); |
917 | } | |
918 | ||
919 | static int vhost_net_open(struct inode *inode, struct file *f) | |
920 | { | |
23cc5a99 | 921 | struct vhost_net *n; |
c23f3445 | 922 | struct vhost_dev *dev; |
3ab2e420 | 923 | struct vhost_virtqueue **vqs; |
5990a305 | 924 | void **queue; |
59566b6e | 925 | int i; |
c23f3445 | 926 | |
dcda9b04 | 927 | n = kvmalloc(sizeof *n, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
6c5ab651 MH |
928 | if (!n) |
929 | return -ENOMEM; | |
3ab2e420 AH |
930 | vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL); |
931 | if (!vqs) { | |
d04257b0 | 932 | kvfree(n); |
3ab2e420 AH |
933 | return -ENOMEM; |
934 | } | |
c23f3445 | 935 | |
5990a305 | 936 | queue = kmalloc_array(VHOST_RX_BATCH, sizeof(void *), |
c67df11f JW |
937 | GFP_KERNEL); |
938 | if (!queue) { | |
939 | kfree(vqs); | |
940 | kvfree(n); | |
941 | return -ENOMEM; | |
942 | } | |
943 | n->vqs[VHOST_NET_VQ_RX].rxq.queue = queue; | |
944 | ||
c23f3445 | 945 | dev = &n->dev; |
3ab2e420 AH |
946 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
947 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
948 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
949 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
950 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
951 | n->vqs[i].ubufs = NULL; | |
952 | n->vqs[i].ubuf_info = NULL; | |
953 | n->vqs[i].upend_idx = 0; | |
954 | n->vqs[i].done_idx = 0; | |
81f95a55 MT |
955 | n->vqs[i].vhost_hlen = 0; |
956 | n->vqs[i].sock_hlen = 0; | |
ab7e34b3 | 957 | n->vqs[i].rx_ring = NULL; |
c67df11f | 958 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f | 959 | } |
59566b6e | 960 | vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 | 961 | |
a9a08845 LT |
962 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, EPOLLOUT, dev); |
963 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, EPOLLIN, dev); | |
3a4d5c94 MT |
964 | |
965 | f->private_data = n; | |
966 | ||
967 | return 0; | |
968 | } | |
969 | ||
3a4d5c94 MT |
970 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, |
971 | struct vhost_virtqueue *vq) | |
972 | { | |
973 | struct socket *sock; | |
c67df11f JW |
974 | struct vhost_net_virtqueue *nvq = |
975 | container_of(vq, struct vhost_net_virtqueue, vq); | |
3a4d5c94 MT |
976 | |
977 | mutex_lock(&vq->mutex); | |
22fa90c7 | 978 | sock = vq->private_data; |
3a4d5c94 | 979 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 980 | vq->private_data = NULL; |
c67df11f | 981 | vhost_net_buf_unproduce(nvq); |
303fd71b | 982 | nvq->rx_ring = NULL; |
3a4d5c94 MT |
983 | mutex_unlock(&vq->mutex); |
984 | return sock; | |
985 | } | |
986 | ||
987 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
988 | struct socket **rx_sock) | |
989 | { | |
3ab2e420 AH |
990 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
991 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
992 | } |
993 | ||
994 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
995 | { | |
996 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 997 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
998 | } |
999 | ||
1000 | static void vhost_net_flush(struct vhost_net *n) | |
1001 | { | |
1002 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
1003 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 1004 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 1005 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1006 | n->tx_flush = true; |
3ab2e420 | 1007 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1008 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 1009 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 1010 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1011 | n->tx_flush = false; |
0ad8b480 | 1012 | atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); |
3ab2e420 | 1013 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1014 | } |
3a4d5c94 MT |
1015 | } |
1016 | ||
1017 | static int vhost_net_release(struct inode *inode, struct file *f) | |
1018 | { | |
1019 | struct vhost_net *n = f->private_data; | |
1020 | struct socket *tx_sock; | |
1021 | struct socket *rx_sock; | |
1022 | ||
1023 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
1024 | vhost_net_flush(n); | |
b211616d | 1025 | vhost_dev_stop(&n->dev); |
f6f93f75 | 1026 | vhost_dev_cleanup(&n->dev); |
81f95a55 | 1027 | vhost_net_vq_reset(n); |
3a4d5c94 | 1028 | if (tx_sock) |
09aaacf0 | 1029 | sockfd_put(tx_sock); |
3a4d5c94 | 1030 | if (rx_sock) |
09aaacf0 | 1031 | sockfd_put(rx_sock); |
b0c057ca MT |
1032 | /* Make sure no callbacks are outstanding */ |
1033 | synchronize_rcu_bh(); | |
3a4d5c94 MT |
1034 | /* We do an extra flush before freeing memory, |
1035 | * since jobs can re-queue themselves. */ | |
1036 | vhost_net_flush(n); | |
c67df11f | 1037 | kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue); |
3ab2e420 | 1038 | kfree(n->dev.vqs); |
d04257b0 | 1039 | kvfree(n); |
3a4d5c94 MT |
1040 | return 0; |
1041 | } | |
1042 | ||
1043 | static struct socket *get_raw_socket(int fd) | |
1044 | { | |
1045 | struct { | |
1046 | struct sockaddr_ll sa; | |
1047 | char buf[MAX_ADDR_LEN]; | |
1048 | } uaddr; | |
9b2c45d4 | 1049 | int r; |
3a4d5c94 | 1050 | struct socket *sock = sockfd_lookup(fd, &r); |
d47effe1 | 1051 | |
3a4d5c94 MT |
1052 | if (!sock) |
1053 | return ERR_PTR(-ENOTSOCK); | |
1054 | ||
1055 | /* Parameter checking */ | |
1056 | if (sock->sk->sk_type != SOCK_RAW) { | |
1057 | r = -ESOCKTNOSUPPORT; | |
1058 | goto err; | |
1059 | } | |
1060 | ||
9b2c45d4 DV |
1061 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, 0); |
1062 | if (r < 0) | |
3a4d5c94 MT |
1063 | goto err; |
1064 | ||
1065 | if (uaddr.sa.sll_family != AF_PACKET) { | |
1066 | r = -EPFNOSUPPORT; | |
1067 | goto err; | |
1068 | } | |
1069 | return sock; | |
1070 | err: | |
09aaacf0 | 1071 | sockfd_put(sock); |
3a4d5c94 MT |
1072 | return ERR_PTR(r); |
1073 | } | |
1074 | ||
5990a305 | 1075 | static struct ptr_ring *get_tap_ptr_ring(int fd) |
c67df11f | 1076 | { |
5990a305 | 1077 | struct ptr_ring *ring; |
c67df11f JW |
1078 | struct file *file = fget(fd); |
1079 | ||
1080 | if (!file) | |
1081 | return NULL; | |
5990a305 JW |
1082 | ring = tun_get_tx_ring(file); |
1083 | if (!IS_ERR(ring)) | |
c67df11f | 1084 | goto out; |
5990a305 JW |
1085 | ring = tap_get_ptr_ring(file); |
1086 | if (!IS_ERR(ring)) | |
c67df11f | 1087 | goto out; |
5990a305 | 1088 | ring = NULL; |
c67df11f JW |
1089 | out: |
1090 | fput(file); | |
5990a305 | 1091 | return ring; |
c67df11f JW |
1092 | } |
1093 | ||
501c774c | 1094 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
1095 | { |
1096 | struct file *file = fget(fd); | |
1097 | struct socket *sock; | |
d47effe1 | 1098 | |
3a4d5c94 MT |
1099 | if (!file) |
1100 | return ERR_PTR(-EBADF); | |
1101 | sock = tun_get_socket(file); | |
501c774c AB |
1102 | if (!IS_ERR(sock)) |
1103 | return sock; | |
635b8c8e | 1104 | sock = tap_get_socket(file); |
3a4d5c94 MT |
1105 | if (IS_ERR(sock)) |
1106 | fput(file); | |
1107 | return sock; | |
1108 | } | |
1109 | ||
1110 | static struct socket *get_socket(int fd) | |
1111 | { | |
1112 | struct socket *sock; | |
d47effe1 | 1113 | |
3a4d5c94 MT |
1114 | /* special case to disable backend */ |
1115 | if (fd == -1) | |
1116 | return NULL; | |
1117 | sock = get_raw_socket(fd); | |
1118 | if (!IS_ERR(sock)) | |
1119 | return sock; | |
501c774c | 1120 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
1121 | if (!IS_ERR(sock)) |
1122 | return sock; | |
1123 | return ERR_PTR(-ENOTSOCK); | |
1124 | } | |
1125 | ||
1126 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
1127 | { | |
1128 | struct socket *sock, *oldsock; | |
1129 | struct vhost_virtqueue *vq; | |
2839400f | 1130 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 1131 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
1132 | int r; |
1133 | ||
1134 | mutex_lock(&n->dev.mutex); | |
1135 | r = vhost_dev_check_owner(&n->dev); | |
1136 | if (r) | |
1137 | goto err; | |
1138 | ||
1139 | if (index >= VHOST_NET_VQ_MAX) { | |
1140 | r = -ENOBUFS; | |
1141 | goto err; | |
1142 | } | |
3ab2e420 | 1143 | vq = &n->vqs[index].vq; |
2839400f | 1144 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
1145 | mutex_lock(&vq->mutex); |
1146 | ||
1147 | /* Verify that ring has been setup correctly. */ | |
1148 | if (!vhost_vq_access_ok(vq)) { | |
1149 | r = -EFAULT; | |
1dace8c8 | 1150 | goto err_vq; |
3a4d5c94 MT |
1151 | } |
1152 | sock = get_socket(fd); | |
1153 | if (IS_ERR(sock)) { | |
1154 | r = PTR_ERR(sock); | |
1dace8c8 | 1155 | goto err_vq; |
3a4d5c94 MT |
1156 | } |
1157 | ||
1158 | /* start polling new socket */ | |
22fa90c7 | 1159 | oldsock = vq->private_data; |
11fe8839 | 1160 | if (sock != oldsock) { |
fe729a57 AH |
1161 | ubufs = vhost_net_ubuf_alloc(vq, |
1162 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
1163 | if (IS_ERR(ubufs)) { |
1164 | r = PTR_ERR(ubufs); | |
1165 | goto err_ubufs; | |
1166 | } | |
692a998b | 1167 | |
d47effe1 | 1168 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 1169 | vq->private_data = sock; |
c67df11f | 1170 | vhost_net_buf_unproduce(nvq); |
80f7d030 | 1171 | r = vhost_vq_init_access(vq); |
f59281da | 1172 | if (r) |
692a998b | 1173 | goto err_used; |
2b8b328b JW |
1174 | r = vhost_net_enable_vq(n, vq); |
1175 | if (r) | |
1176 | goto err_used; | |
303fd71b JW |
1177 | if (index == VHOST_NET_VQ_RX) |
1178 | nvq->rx_ring = get_tap_ptr_ring(fd); | |
692a998b | 1179 | |
2839400f AH |
1180 | oldubufs = nvq->ubufs; |
1181 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
1182 | |
1183 | n->tx_packets = 0; | |
1184 | n->tx_zcopy_err = 0; | |
1280c27f | 1185 | n->tx_flush = false; |
dd1f4078 | 1186 | } |
3a4d5c94 | 1187 | |
1680e906 MT |
1188 | mutex_unlock(&vq->mutex); |
1189 | ||
c047e5f3 | 1190 | if (oldubufs) { |
c38e39c3 | 1191 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 1192 | mutex_lock(&vq->mutex); |
eaae8132 | 1193 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
1194 | mutex_unlock(&vq->mutex); |
1195 | } | |
bab632d6 | 1196 | |
3a4d5c94 MT |
1197 | if (oldsock) { |
1198 | vhost_net_flush_vq(n, index); | |
09aaacf0 | 1199 | sockfd_put(oldsock); |
3a4d5c94 | 1200 | } |
1dace8c8 | 1201 | |
1680e906 MT |
1202 | mutex_unlock(&n->dev.mutex); |
1203 | return 0; | |
1204 | ||
692a998b | 1205 | err_used: |
22fa90c7 | 1206 | vq->private_data = oldsock; |
692a998b JW |
1207 | vhost_net_enable_vq(n, vq); |
1208 | if (ubufs) | |
c38e39c3 | 1209 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 | 1210 | err_ubufs: |
09aaacf0 | 1211 | sockfd_put(sock); |
1dace8c8 JD |
1212 | err_vq: |
1213 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
1214 | err: |
1215 | mutex_unlock(&n->dev.mutex); | |
1216 | return r; | |
1217 | } | |
1218 | ||
1219 | static long vhost_net_reset_owner(struct vhost_net *n) | |
1220 | { | |
1221 | struct socket *tx_sock = NULL; | |
1222 | struct socket *rx_sock = NULL; | |
1223 | long err; | |
a9709d68 | 1224 | struct vhost_umem *umem; |
d47effe1 | 1225 | |
3a4d5c94 MT |
1226 | mutex_lock(&n->dev.mutex); |
1227 | err = vhost_dev_check_owner(&n->dev); | |
1228 | if (err) | |
1229 | goto done; | |
a9709d68 JW |
1230 | umem = vhost_dev_reset_owner_prepare(); |
1231 | if (!umem) { | |
150b9e51 MT |
1232 | err = -ENOMEM; |
1233 | goto done; | |
1234 | } | |
3a4d5c94 MT |
1235 | vhost_net_stop(n, &tx_sock, &rx_sock); |
1236 | vhost_net_flush(n); | |
4cd87951 | 1237 | vhost_dev_stop(&n->dev); |
a9709d68 | 1238 | vhost_dev_reset_owner(&n->dev, umem); |
81f95a55 | 1239 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
1240 | done: |
1241 | mutex_unlock(&n->dev.mutex); | |
1242 | if (tx_sock) | |
09aaacf0 | 1243 | sockfd_put(tx_sock); |
3a4d5c94 | 1244 | if (rx_sock) |
09aaacf0 | 1245 | sockfd_put(rx_sock); |
3a4d5c94 MT |
1246 | return err; |
1247 | } | |
1248 | ||
1249 | static int vhost_net_set_features(struct vhost_net *n, u64 features) | |
1250 | { | |
8dd014ad | 1251 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1252 | int i; |
8dd014ad | 1253 | |
e4fca7d6 MT |
1254 | hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
1255 | (1ULL << VIRTIO_F_VERSION_1))) ? | |
8dd014ad DS |
1256 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
1257 | sizeof(struct virtio_net_hdr); | |
1258 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1259 | /* vhost provides vnet_hdr */ | |
1260 | vhost_hlen = hdr_len; | |
1261 | sock_hlen = 0; | |
1262 | } else { | |
1263 | /* socket provides vnet_hdr */ | |
1264 | vhost_hlen = 0; | |
1265 | sock_hlen = hdr_len; | |
1266 | } | |
3a4d5c94 MT |
1267 | mutex_lock(&n->dev.mutex); |
1268 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
6b1e6cc7 JW |
1269 | !vhost_log_access_ok(&n->dev)) |
1270 | goto out_unlock; | |
1271 | ||
1272 | if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) { | |
1273 | if (vhost_init_device_iotlb(&n->dev, true)) | |
1274 | goto out_unlock; | |
3a4d5c94 | 1275 | } |
6b1e6cc7 | 1276 | |
3a4d5c94 | 1277 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
3ab2e420 | 1278 | mutex_lock(&n->vqs[i].vq.mutex); |
ea16c514 | 1279 | n->vqs[i].vq.acked_features = features; |
81f95a55 MT |
1280 | n->vqs[i].vhost_hlen = vhost_hlen; |
1281 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1282 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 | 1283 | } |
3a4d5c94 MT |
1284 | mutex_unlock(&n->dev.mutex); |
1285 | return 0; | |
6b1e6cc7 JW |
1286 | |
1287 | out_unlock: | |
1288 | mutex_unlock(&n->dev.mutex); | |
1289 | return -EFAULT; | |
3a4d5c94 MT |
1290 | } |
1291 | ||
b1ad8496 AH |
1292 | static long vhost_net_set_owner(struct vhost_net *n) |
1293 | { | |
1294 | int r; | |
1295 | ||
1296 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1297 | if (vhost_dev_has_owner(&n->dev)) { |
1298 | r = -EBUSY; | |
1299 | goto out; | |
1300 | } | |
b1ad8496 AH |
1301 | r = vhost_net_set_ubuf_info(n); |
1302 | if (r) | |
1303 | goto out; | |
1304 | r = vhost_dev_set_owner(&n->dev); | |
1305 | if (r) | |
1306 | vhost_net_clear_ubuf_info(n); | |
1307 | vhost_net_flush(n); | |
1308 | out: | |
1309 | mutex_unlock(&n->dev.mutex); | |
1310 | return r; | |
1311 | } | |
1312 | ||
3a4d5c94 MT |
1313 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1314 | unsigned long arg) | |
1315 | { | |
1316 | struct vhost_net *n = f->private_data; | |
1317 | void __user *argp = (void __user *)arg; | |
1318 | u64 __user *featurep = argp; | |
1319 | struct vhost_vring_file backend; | |
1320 | u64 features; | |
1321 | int r; | |
d47effe1 | 1322 | |
3a4d5c94 MT |
1323 | switch (ioctl) { |
1324 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1325 | if (copy_from_user(&backend, argp, sizeof backend)) |
1326 | return -EFAULT; | |
3a4d5c94 MT |
1327 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1328 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1329 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1330 | if (copy_to_user(featurep, &features, sizeof features)) |
1331 | return -EFAULT; | |
1332 | return 0; | |
3a4d5c94 | 1333 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1334 | if (copy_from_user(&features, featurep, sizeof features)) |
1335 | return -EFAULT; | |
0dd05a3b | 1336 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1337 | return -EOPNOTSUPP; |
1338 | return vhost_net_set_features(n, features); | |
1339 | case VHOST_RESET_OWNER: | |
1340 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1341 | case VHOST_SET_OWNER: |
1342 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1343 | default: |
1344 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1345 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1346 | if (r == -ENOIOCTLCMD) | |
1347 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1348 | else | |
1349 | vhost_net_flush(n); | |
3a4d5c94 MT |
1350 | mutex_unlock(&n->dev.mutex); |
1351 | return r; | |
1352 | } | |
1353 | } | |
1354 | ||
1355 | #ifdef CONFIG_COMPAT | |
1356 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1357 | unsigned long arg) | |
1358 | { | |
1359 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1360 | } | |
1361 | #endif | |
1362 | ||
6b1e6cc7 JW |
1363 | static ssize_t vhost_net_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1364 | { | |
1365 | struct file *file = iocb->ki_filp; | |
1366 | struct vhost_net *n = file->private_data; | |
1367 | struct vhost_dev *dev = &n->dev; | |
1368 | int noblock = file->f_flags & O_NONBLOCK; | |
1369 | ||
1370 | return vhost_chr_read_iter(dev, to, noblock); | |
1371 | } | |
1372 | ||
1373 | static ssize_t vhost_net_chr_write_iter(struct kiocb *iocb, | |
1374 | struct iov_iter *from) | |
1375 | { | |
1376 | struct file *file = iocb->ki_filp; | |
1377 | struct vhost_net *n = file->private_data; | |
1378 | struct vhost_dev *dev = &n->dev; | |
1379 | ||
1380 | return vhost_chr_write_iter(dev, from); | |
1381 | } | |
1382 | ||
afc9a42b | 1383 | static __poll_t vhost_net_chr_poll(struct file *file, poll_table *wait) |
6b1e6cc7 JW |
1384 | { |
1385 | struct vhost_net *n = file->private_data; | |
1386 | struct vhost_dev *dev = &n->dev; | |
1387 | ||
1388 | return vhost_chr_poll(file, dev, wait); | |
1389 | } | |
1390 | ||
373a83a6 | 1391 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1392 | .owner = THIS_MODULE, |
1393 | .release = vhost_net_release, | |
6b1e6cc7 JW |
1394 | .read_iter = vhost_net_chr_read_iter, |
1395 | .write_iter = vhost_net_chr_write_iter, | |
1396 | .poll = vhost_net_chr_poll, | |
3a4d5c94 MT |
1397 | .unlocked_ioctl = vhost_net_ioctl, |
1398 | #ifdef CONFIG_COMPAT | |
1399 | .compat_ioctl = vhost_net_compat_ioctl, | |
1400 | #endif | |
1401 | .open = vhost_net_open, | |
6038f373 | 1402 | .llseek = noop_llseek, |
3a4d5c94 MT |
1403 | }; |
1404 | ||
1405 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1406 | .minor = VHOST_NET_MINOR, |
1407 | .name = "vhost-net", | |
1408 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1409 | }; |
1410 | ||
a8d3782f | 1411 | static int vhost_net_init(void) |
3a4d5c94 | 1412 | { |
bab632d6 | 1413 | if (experimental_zcopytx) |
fe729a57 | 1414 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1415 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1416 | } |
1417 | module_init(vhost_net_init); | |
1418 | ||
a8d3782f | 1419 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1420 | { |
1421 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1422 | } |
1423 | module_exit(vhost_net_exit); | |
1424 | ||
1425 | MODULE_VERSION("0.0.1"); | |
1426 | MODULE_LICENSE("GPL v2"); | |
1427 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1428 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1429 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1430 | MODULE_ALIAS("devname:vhost-net"); |