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 | ||
429711ae JW |
80 | enum { |
81 | VHOST_NET_BACKEND_FEATURES = (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2) | |
82 | }; | |
83 | ||
3a4d5c94 MT |
84 | enum { |
85 | VHOST_NET_VQ_RX = 0, | |
86 | VHOST_NET_VQ_TX = 1, | |
87 | VHOST_NET_VQ_MAX = 2, | |
88 | }; | |
89 | ||
fe729a57 | 90 | struct vhost_net_ubuf_ref { |
0ad8b480 MT |
91 | /* refcount follows semantics similar to kref: |
92 | * 0: object is released | |
93 | * 1: no outstanding ubufs | |
94 | * >1: outstanding ubufs | |
95 | */ | |
96 | atomic_t refcount; | |
2839400f AH |
97 | wait_queue_head_t wait; |
98 | struct vhost_virtqueue *vq; | |
99 | }; | |
100 | ||
d0d86971 | 101 | #define VHOST_NET_BATCH 64 |
c67df11f | 102 | struct vhost_net_buf { |
5990a305 | 103 | void **queue; |
c67df11f JW |
104 | int tail; |
105 | int head; | |
106 | }; | |
107 | ||
3ab2e420 AH |
108 | struct vhost_net_virtqueue { |
109 | struct vhost_virtqueue vq; | |
81f95a55 MT |
110 | size_t vhost_hlen; |
111 | size_t sock_hlen; | |
2839400f AH |
112 | /* vhost zerocopy support fields below: */ |
113 | /* last used idx for outstanding DMA zerocopy buffers */ | |
114 | int upend_idx; | |
f5a4941a JW |
115 | /* For TX, first used idx for DMA done zerocopy buffers |
116 | * For RX, number of batched heads | |
117 | */ | |
2839400f | 118 | int done_idx; |
0a0be13b JW |
119 | /* Number of XDP frames batched */ |
120 | int batched_xdp; | |
2839400f AH |
121 | /* an array of userspace buffers info */ |
122 | struct ubuf_info *ubuf_info; | |
123 | /* Reference counting for outstanding ubufs. | |
124 | * Protected by vq mutex. Writers must also take device mutex. */ | |
fe729a57 | 125 | struct vhost_net_ubuf_ref *ubufs; |
5990a305 | 126 | struct ptr_ring *rx_ring; |
c67df11f | 127 | struct vhost_net_buf rxq; |
0a0be13b JW |
128 | /* Batched XDP buffs */ |
129 | struct xdp_buff *xdp; | |
3ab2e420 AH |
130 | }; |
131 | ||
3a4d5c94 MT |
132 | struct vhost_net { |
133 | struct vhost_dev dev; | |
3ab2e420 | 134 | struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX]; |
3a4d5c94 | 135 | struct vhost_poll poll[VHOST_NET_VQ_MAX]; |
eaae8132 MT |
136 | /* Number of TX recently submitted. |
137 | * Protected by tx vq lock. */ | |
138 | unsigned tx_packets; | |
139 | /* Number of times zerocopy TX recently failed. | |
140 | * Protected by tx vq lock. */ | |
141 | unsigned tx_zcopy_err; | |
1280c27f MT |
142 | /* Flush in progress. Protected by tx vq lock. */ |
143 | bool tx_flush; | |
3a4d5c94 MT |
144 | }; |
145 | ||
fe729a57 | 146 | static unsigned vhost_net_zcopy_mask __read_mostly; |
2839400f | 147 | |
c67df11f JW |
148 | static void *vhost_net_buf_get_ptr(struct vhost_net_buf *rxq) |
149 | { | |
150 | if (rxq->tail != rxq->head) | |
151 | return rxq->queue[rxq->head]; | |
152 | else | |
153 | return NULL; | |
154 | } | |
155 | ||
156 | static int vhost_net_buf_get_size(struct vhost_net_buf *rxq) | |
157 | { | |
158 | return rxq->tail - rxq->head; | |
159 | } | |
160 | ||
161 | static int vhost_net_buf_is_empty(struct vhost_net_buf *rxq) | |
162 | { | |
163 | return rxq->tail == rxq->head; | |
164 | } | |
165 | ||
166 | static void *vhost_net_buf_consume(struct vhost_net_buf *rxq) | |
167 | { | |
168 | void *ret = vhost_net_buf_get_ptr(rxq); | |
169 | ++rxq->head; | |
170 | return ret; | |
171 | } | |
172 | ||
173 | static int vhost_net_buf_produce(struct vhost_net_virtqueue *nvq) | |
174 | { | |
175 | struct vhost_net_buf *rxq = &nvq->rxq; | |
176 | ||
177 | rxq->head = 0; | |
5990a305 | 178 | rxq->tail = ptr_ring_consume_batched(nvq->rx_ring, rxq->queue, |
d0d86971 | 179 | VHOST_NET_BATCH); |
c67df11f JW |
180 | return rxq->tail; |
181 | } | |
182 | ||
183 | static void vhost_net_buf_unproduce(struct vhost_net_virtqueue *nvq) | |
184 | { | |
185 | struct vhost_net_buf *rxq = &nvq->rxq; | |
186 | ||
5990a305 JW |
187 | if (nvq->rx_ring && !vhost_net_buf_is_empty(rxq)) { |
188 | ptr_ring_unconsume(nvq->rx_ring, rxq->queue + rxq->head, | |
189 | vhost_net_buf_get_size(rxq), | |
3a403076 | 190 | tun_ptr_free); |
c67df11f JW |
191 | rxq->head = rxq->tail = 0; |
192 | } | |
193 | } | |
194 | ||
fc72d1d5 JW |
195 | static int vhost_net_buf_peek_len(void *ptr) |
196 | { | |
1ffcbc85 JDB |
197 | if (tun_is_xdp_frame(ptr)) { |
198 | struct xdp_frame *xdpf = tun_ptr_to_xdp(ptr); | |
fc72d1d5 | 199 | |
1ffcbc85 | 200 | return xdpf->len; |
fc72d1d5 JW |
201 | } |
202 | ||
203 | return __skb_array_len_with_tag(ptr); | |
204 | } | |
205 | ||
c67df11f JW |
206 | static int vhost_net_buf_peek(struct vhost_net_virtqueue *nvq) |
207 | { | |
208 | struct vhost_net_buf *rxq = &nvq->rxq; | |
209 | ||
210 | if (!vhost_net_buf_is_empty(rxq)) | |
211 | goto out; | |
212 | ||
213 | if (!vhost_net_buf_produce(nvq)) | |
214 | return 0; | |
215 | ||
216 | out: | |
fc72d1d5 | 217 | return vhost_net_buf_peek_len(vhost_net_buf_get_ptr(rxq)); |
c67df11f JW |
218 | } |
219 | ||
220 | static void vhost_net_buf_init(struct vhost_net_buf *rxq) | |
221 | { | |
222 | rxq->head = rxq->tail = 0; | |
223 | } | |
224 | ||
fe729a57 | 225 | static void vhost_net_enable_zcopy(int vq) |
2839400f | 226 | { |
fe729a57 | 227 | vhost_net_zcopy_mask |= 0x1 << vq; |
2839400f AH |
228 | } |
229 | ||
fe729a57 AH |
230 | static struct vhost_net_ubuf_ref * |
231 | vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) | |
2839400f | 232 | { |
fe729a57 | 233 | struct vhost_net_ubuf_ref *ubufs; |
2839400f AH |
234 | /* No zero copy backend? Nothing to count. */ |
235 | if (!zcopy) | |
236 | return NULL; | |
237 | ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL); | |
238 | if (!ubufs) | |
239 | return ERR_PTR(-ENOMEM); | |
0ad8b480 | 240 | atomic_set(&ubufs->refcount, 1); |
2839400f AH |
241 | init_waitqueue_head(&ubufs->wait); |
242 | ubufs->vq = vq; | |
243 | return ubufs; | |
244 | } | |
245 | ||
0ad8b480 | 246 | static int vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 247 | { |
0ad8b480 MT |
248 | int r = atomic_sub_return(1, &ubufs->refcount); |
249 | if (unlikely(!r)) | |
250 | wake_up(&ubufs->wait); | |
251 | return r; | |
2839400f AH |
252 | } |
253 | ||
fe729a57 | 254 | static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs) |
2839400f | 255 | { |
0ad8b480 MT |
256 | vhost_net_ubuf_put(ubufs); |
257 | wait_event(ubufs->wait, !atomic_read(&ubufs->refcount)); | |
c38e39c3 MT |
258 | } |
259 | ||
260 | static void vhost_net_ubuf_put_wait_and_free(struct vhost_net_ubuf_ref *ubufs) | |
261 | { | |
262 | vhost_net_ubuf_put_and_wait(ubufs); | |
2839400f AH |
263 | kfree(ubufs); |
264 | } | |
265 | ||
b1ad8496 AH |
266 | static void vhost_net_clear_ubuf_info(struct vhost_net *n) |
267 | { | |
b1ad8496 AH |
268 | int i; |
269 | ||
288cfe78 MT |
270 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
271 | kfree(n->vqs[i].ubuf_info); | |
272 | n->vqs[i].ubuf_info = NULL; | |
b1ad8496 AH |
273 | } |
274 | } | |
275 | ||
0a1febf7 | 276 | static int vhost_net_set_ubuf_info(struct vhost_net *n) |
2839400f AH |
277 | { |
278 | bool zcopy; | |
279 | int i; | |
280 | ||
288cfe78 | 281 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
fe729a57 | 282 | zcopy = vhost_net_zcopy_mask & (0x1 << i); |
2839400f AH |
283 | if (!zcopy) |
284 | continue; | |
6da2ec56 KC |
285 | n->vqs[i].ubuf_info = |
286 | kmalloc_array(UIO_MAXIOV, | |
287 | sizeof(*n->vqs[i].ubuf_info), | |
288 | GFP_KERNEL); | |
2839400f AH |
289 | if (!n->vqs[i].ubuf_info) |
290 | goto err; | |
291 | } | |
292 | return 0; | |
293 | ||
294 | err: | |
288cfe78 | 295 | vhost_net_clear_ubuf_info(n); |
2839400f AH |
296 | return -ENOMEM; |
297 | } | |
298 | ||
0a1febf7 | 299 | static void vhost_net_vq_reset(struct vhost_net *n) |
2839400f AH |
300 | { |
301 | int i; | |
302 | ||
288cfe78 MT |
303 | vhost_net_clear_ubuf_info(n); |
304 | ||
2839400f AH |
305 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
306 | n->vqs[i].done_idx = 0; | |
307 | n->vqs[i].upend_idx = 0; | |
308 | n->vqs[i].ubufs = NULL; | |
81f95a55 MT |
309 | n->vqs[i].vhost_hlen = 0; |
310 | n->vqs[i].sock_hlen = 0; | |
c67df11f | 311 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f AH |
312 | } |
313 | ||
314 | } | |
315 | ||
eaae8132 MT |
316 | static void vhost_net_tx_packet(struct vhost_net *net) |
317 | { | |
318 | ++net->tx_packets; | |
319 | if (net->tx_packets < 1024) | |
320 | return; | |
321 | net->tx_packets = 0; | |
322 | net->tx_zcopy_err = 0; | |
323 | } | |
324 | ||
325 | static void vhost_net_tx_err(struct vhost_net *net) | |
326 | { | |
327 | ++net->tx_zcopy_err; | |
328 | } | |
329 | ||
330 | static bool vhost_net_tx_select_zcopy(struct vhost_net *net) | |
331 | { | |
1280c27f MT |
332 | /* TX flush waits for outstanding DMAs to be done. |
333 | * Don't start new DMAs. | |
334 | */ | |
335 | return !net->tx_flush && | |
336 | net->tx_packets / 64 >= net->tx_zcopy_err; | |
eaae8132 MT |
337 | } |
338 | ||
bab632d6 MT |
339 | static bool vhost_sock_zcopy(struct socket *sock) |
340 | { | |
341 | return unlikely(experimental_zcopytx) && | |
342 | sock_flag(sock->sk, SOCK_ZEROCOPY); | |
343 | } | |
344 | ||
0a0be13b JW |
345 | static bool vhost_sock_xdp(struct socket *sock) |
346 | { | |
347 | return sock_flag(sock->sk, SOCK_XDP); | |
348 | } | |
349 | ||
b211616d MT |
350 | /* In case of DMA done not in order in lower device driver for some reason. |
351 | * upend_idx is used to track end of used idx, done_idx is used to track head | |
352 | * of used idx. Once lower device DMA done contiguously, we will signal KVM | |
353 | * guest used idx. | |
354 | */ | |
094afe7d JW |
355 | static void vhost_zerocopy_signal_used(struct vhost_net *net, |
356 | struct vhost_virtqueue *vq) | |
b211616d | 357 | { |
2839400f AH |
358 | struct vhost_net_virtqueue *nvq = |
359 | container_of(vq, struct vhost_net_virtqueue, vq); | |
c92112ae | 360 | int i, add; |
b211616d MT |
361 | int j = 0; |
362 | ||
2839400f | 363 | for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { |
eaae8132 MT |
364 | if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) |
365 | vhost_net_tx_err(net); | |
b211616d MT |
366 | if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { |
367 | vq->heads[i].len = VHOST_DMA_CLEAR_LEN; | |
b211616d MT |
368 | ++j; |
369 | } else | |
370 | break; | |
371 | } | |
c92112ae JW |
372 | while (j) { |
373 | add = min(UIO_MAXIOV - nvq->done_idx, j); | |
374 | vhost_add_used_and_signal_n(vq->dev, vq, | |
375 | &vq->heads[nvq->done_idx], add); | |
376 | nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; | |
377 | j -= add; | |
378 | } | |
b211616d MT |
379 | } |
380 | ||
eaae8132 | 381 | static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) |
b211616d | 382 | { |
fe729a57 | 383 | struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; |
b211616d | 384 | struct vhost_virtqueue *vq = ubufs->vq; |
0ad8b480 | 385 | int cnt; |
24eb21a1 | 386 | |
b0c057ca MT |
387 | rcu_read_lock_bh(); |
388 | ||
19c73b3e JW |
389 | /* set len to mark this desc buffers done DMA */ |
390 | vq->heads[ubuf->desc].len = success ? | |
391 | VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; | |
0ad8b480 | 392 | cnt = vhost_net_ubuf_put(ubufs); |
19c73b3e | 393 | |
24eb21a1 MT |
394 | /* |
395 | * Trigger polling thread if guest stopped submitting new buffers: | |
0ad8b480 | 396 | * in this case, the refcount after decrement will eventually reach 1. |
24eb21a1 MT |
397 | * We also trigger polling periodically after each 16 packets |
398 | * (the value 16 here is more or less arbitrary, it's tuned to trigger | |
399 | * less than 10% of times). | |
400 | */ | |
0ad8b480 | 401 | if (cnt <= 1 || !(cnt % 16)) |
24eb21a1 | 402 | vhost_poll_queue(&vq->poll); |
b0c057ca MT |
403 | |
404 | rcu_read_unlock_bh(); | |
b211616d MT |
405 | } |
406 | ||
03088137 JW |
407 | static inline unsigned long busy_clock(void) |
408 | { | |
409 | return local_clock() >> 10; | |
410 | } | |
411 | ||
027b1760 | 412 | static bool vhost_can_busy_poll(unsigned long endtime) |
03088137 | 413 | { |
027b1760 TM |
414 | return likely(!need_resched() && !time_after(busy_clock(), endtime) && |
415 | !signal_pending(current)); | |
03088137 JW |
416 | } |
417 | ||
8241a1e4 JW |
418 | static void vhost_net_disable_vq(struct vhost_net *n, |
419 | struct vhost_virtqueue *vq) | |
420 | { | |
421 | struct vhost_net_virtqueue *nvq = | |
422 | container_of(vq, struct vhost_net_virtqueue, vq); | |
423 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
424 | if (!vq->private_data) | |
425 | return; | |
426 | vhost_poll_stop(poll); | |
427 | } | |
428 | ||
429 | static int vhost_net_enable_vq(struct vhost_net *n, | |
430 | struct vhost_virtqueue *vq) | |
431 | { | |
432 | struct vhost_net_virtqueue *nvq = | |
433 | container_of(vq, struct vhost_net_virtqueue, vq); | |
434 | struct vhost_poll *poll = n->poll + (nvq - n->vqs); | |
435 | struct socket *sock; | |
436 | ||
437 | sock = vq->private_data; | |
438 | if (!sock) | |
439 | return 0; | |
440 | ||
441 | return vhost_poll_start(poll, sock->file); | |
442 | } | |
443 | ||
4afb52c2 JW |
444 | static void vhost_net_signal_used(struct vhost_net_virtqueue *nvq) |
445 | { | |
446 | struct vhost_virtqueue *vq = &nvq->vq; | |
447 | struct vhost_dev *dev = vq->dev; | |
448 | ||
449 | if (!nvq->done_idx) | |
450 | return; | |
451 | ||
452 | vhost_add_used_and_signal_n(dev, vq, vq->heads, nvq->done_idx); | |
453 | nvq->done_idx = 0; | |
454 | } | |
455 | ||
0a0be13b JW |
456 | static void vhost_tx_batch(struct vhost_net *net, |
457 | struct vhost_net_virtqueue *nvq, | |
458 | struct socket *sock, | |
459 | struct msghdr *msghdr) | |
460 | { | |
461 | struct tun_msg_ctl ctl = { | |
462 | .type = TUN_MSG_PTR, | |
463 | .num = nvq->batched_xdp, | |
464 | .ptr = nvq->xdp, | |
465 | }; | |
466 | int err; | |
467 | ||
468 | if (nvq->batched_xdp == 0) | |
469 | goto signal_used; | |
470 | ||
471 | msghdr->msg_control = &ctl; | |
472 | err = sock->ops->sendmsg(sock, msghdr, 0); | |
473 | if (unlikely(err < 0)) { | |
474 | vq_err(&nvq->vq, "Fail to batch sending packets\n"); | |
475 | return; | |
476 | } | |
477 | ||
478 | signal_used: | |
479 | vhost_net_signal_used(nvq); | |
480 | nvq->batched_xdp = 0; | |
481 | } | |
482 | ||
dc151282 TZ |
483 | static int sock_has_rx_data(struct socket *sock) |
484 | { | |
485 | if (unlikely(!sock)) | |
486 | return 0; | |
487 | ||
488 | if (sock->ops->peek_len) | |
489 | return sock->ops->peek_len(sock); | |
490 | ||
491 | return skb_queue_empty(&sock->sk->sk_receive_queue); | |
492 | } | |
493 | ||
494 | static void vhost_net_busy_poll_try_queue(struct vhost_net *net, | |
495 | struct vhost_virtqueue *vq) | |
496 | { | |
497 | if (!vhost_vq_avail_empty(&net->dev, vq)) { | |
498 | vhost_poll_queue(&vq->poll); | |
499 | } else if (unlikely(vhost_enable_notify(&net->dev, vq))) { | |
500 | vhost_disable_notify(&net->dev, vq); | |
501 | vhost_poll_queue(&vq->poll); | |
502 | } | |
503 | } | |
504 | ||
505 | static void vhost_net_busy_poll(struct vhost_net *net, | |
506 | struct vhost_virtqueue *rvq, | |
507 | struct vhost_virtqueue *tvq, | |
508 | bool *busyloop_intr, | |
509 | bool poll_rx) | |
510 | { | |
511 | unsigned long busyloop_timeout; | |
512 | unsigned long endtime; | |
513 | struct socket *sock; | |
514 | struct vhost_virtqueue *vq = poll_rx ? tvq : rvq; | |
515 | ||
476e8ba7 JW |
516 | /* Try to hold the vq mutex of the paired virtqueue. We can't |
517 | * use mutex_lock() here since we could not guarantee a | |
518 | * consistenet lock ordering. | |
519 | */ | |
520 | if (!mutex_trylock(&vq->mutex)) | |
521 | return; | |
522 | ||
dc151282 TZ |
523 | vhost_disable_notify(&net->dev, vq); |
524 | sock = rvq->private_data; | |
525 | ||
526 | busyloop_timeout = poll_rx ? rvq->busyloop_timeout: | |
527 | tvq->busyloop_timeout; | |
528 | ||
529 | preempt_disable(); | |
530 | endtime = busy_clock() + busyloop_timeout; | |
531 | ||
532 | while (vhost_can_busy_poll(endtime)) { | |
533 | if (vhost_has_work(&net->dev)) { | |
534 | *busyloop_intr = true; | |
535 | break; | |
536 | } | |
537 | ||
538 | if ((sock_has_rx_data(sock) && | |
539 | !vhost_vq_avail_empty(&net->dev, rvq)) || | |
540 | !vhost_vq_avail_empty(&net->dev, tvq)) | |
541 | break; | |
542 | ||
543 | cpu_relax(); | |
544 | } | |
545 | ||
546 | preempt_enable(); | |
547 | ||
548 | if (poll_rx || sock_has_rx_data(sock)) | |
549 | vhost_net_busy_poll_try_queue(net, vq); | |
550 | else if (!poll_rx) /* On tx here, sock has no rx data. */ | |
551 | vhost_enable_notify(&net->dev, rvq); | |
552 | ||
553 | mutex_unlock(&vq->mutex); | |
554 | } | |
555 | ||
03088137 | 556 | static int vhost_net_tx_get_vq_desc(struct vhost_net *net, |
441abde4 | 557 | struct vhost_net_virtqueue *tnvq, |
027b1760 | 558 | unsigned int *out_num, unsigned int *in_num, |
0a0be13b | 559 | struct msghdr *msghdr, bool *busyloop_intr) |
03088137 | 560 | { |
441abde4 TZ |
561 | struct vhost_net_virtqueue *rnvq = &net->vqs[VHOST_NET_VQ_RX]; |
562 | struct vhost_virtqueue *rvq = &rnvq->vq; | |
563 | struct vhost_virtqueue *tvq = &tnvq->vq; | |
564 | ||
565 | int r = vhost_get_vq_desc(tvq, tvq->iov, ARRAY_SIZE(tvq->iov), | |
6b1e6cc7 | 566 | out_num, in_num, NULL, NULL); |
03088137 | 567 | |
441abde4 | 568 | if (r == tvq->num && tvq->busyloop_timeout) { |
0a0be13b | 569 | /* Flush batched packets first */ |
441abde4 | 570 | if (!vhost_sock_zcopy(tvq->private_data)) |
441abde4 TZ |
571 | vhost_tx_batch(net, tnvq, tvq->private_data, msghdr); |
572 | ||
573 | vhost_net_busy_poll(net, rvq, tvq, busyloop_intr, false); | |
574 | ||
575 | r = vhost_get_vq_desc(tvq, tvq->iov, ARRAY_SIZE(tvq->iov), | |
6b1e6cc7 | 576 | out_num, in_num, NULL, NULL); |
03088137 JW |
577 | } |
578 | ||
579 | return r; | |
580 | } | |
581 | ||
0ed005ce JW |
582 | static bool vhost_exceeds_maxpend(struct vhost_net *net) |
583 | { | |
584 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
585 | struct vhost_virtqueue *vq = &nvq->vq; | |
586 | ||
1e6f7453 WB |
587 | return (nvq->upend_idx + UIO_MAXIOV - nvq->done_idx) % UIO_MAXIOV > |
588 | min_t(unsigned int, VHOST_MAX_PEND, vq->num >> 2); | |
0ed005ce JW |
589 | } |
590 | ||
b0d0ea50 JW |
591 | static size_t init_iov_iter(struct vhost_virtqueue *vq, struct iov_iter *iter, |
592 | size_t hdr_size, int out) | |
593 | { | |
594 | /* Skip header. TODO: support TSO. */ | |
595 | size_t len = iov_length(vq->iov, out); | |
596 | ||
597 | iov_iter_init(iter, WRITE, vq->iov, out, len); | |
598 | iov_iter_advance(iter, hdr_size); | |
599 | ||
600 | return iov_iter_count(iter); | |
601 | } | |
602 | ||
272f35cb JW |
603 | static bool vhost_exceeds_weight(int pkts, int total_len) |
604 | { | |
605 | return total_len >= VHOST_NET_WEIGHT || | |
606 | pkts >= VHOST_NET_PKT_WEIGHT; | |
607 | } | |
608 | ||
a2a91a13 JW |
609 | static int get_tx_bufs(struct vhost_net *net, |
610 | struct vhost_net_virtqueue *nvq, | |
611 | struct msghdr *msg, | |
612 | unsigned int *out, unsigned int *in, | |
613 | size_t *len, bool *busyloop_intr) | |
614 | { | |
615 | struct vhost_virtqueue *vq = &nvq->vq; | |
616 | int ret; | |
617 | ||
0a0be13b | 618 | ret = vhost_net_tx_get_vq_desc(net, nvq, out, in, msg, busyloop_intr); |
4afb52c2 | 619 | |
a2a91a13 JW |
620 | if (ret < 0 || ret == vq->num) |
621 | return ret; | |
622 | ||
623 | if (*in) { | |
624 | vq_err(vq, "Unexpected descriptor format for TX: out %d, int %d\n", | |
625 | *out, *in); | |
626 | return -EFAULT; | |
627 | } | |
628 | ||
629 | /* Sanity check */ | |
630 | *len = init_iov_iter(vq, &msg->msg_iter, nvq->vhost_hlen, *out); | |
631 | if (*len == 0) { | |
632 | vq_err(vq, "Unexpected header len for TX: %zd expected %zd\n", | |
633 | *len, nvq->vhost_hlen); | |
634 | return -EFAULT; | |
635 | } | |
636 | ||
637 | return ret; | |
638 | } | |
639 | ||
c92a8a8c JW |
640 | static bool tx_can_batch(struct vhost_virtqueue *vq, size_t total_len) |
641 | { | |
642 | return total_len < VHOST_NET_WEIGHT && | |
643 | !vhost_vq_avail_empty(vq->dev, vq); | |
644 | } | |
645 | ||
0a0be13b JW |
646 | #define VHOST_NET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) |
647 | ||
648 | static int vhost_net_build_xdp(struct vhost_net_virtqueue *nvq, | |
649 | struct iov_iter *from) | |
650 | { | |
651 | struct vhost_virtqueue *vq = &nvq->vq; | |
652 | struct socket *sock = vq->private_data; | |
653 | struct page_frag *alloc_frag = ¤t->task_frag; | |
654 | struct virtio_net_hdr *gso; | |
655 | struct xdp_buff *xdp = &nvq->xdp[nvq->batched_xdp]; | |
656 | struct tun_xdp_hdr *hdr; | |
657 | size_t len = iov_iter_count(from); | |
658 | int headroom = vhost_sock_xdp(sock) ? XDP_PACKET_HEADROOM : 0; | |
659 | int buflen = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
660 | int pad = SKB_DATA_ALIGN(VHOST_NET_RX_PAD + headroom + nvq->sock_hlen); | |
661 | int sock_hlen = nvq->sock_hlen; | |
662 | void *buf; | |
663 | int copied; | |
664 | ||
665 | if (unlikely(len < nvq->sock_hlen)) | |
666 | return -EFAULT; | |
667 | ||
668 | if (SKB_DATA_ALIGN(len + pad) + | |
669 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) > PAGE_SIZE) | |
670 | return -ENOSPC; | |
671 | ||
672 | buflen += SKB_DATA_ALIGN(len + pad); | |
673 | alloc_frag->offset = ALIGN((u64)alloc_frag->offset, SMP_CACHE_BYTES); | |
674 | if (unlikely(!skb_page_frag_refill(buflen, alloc_frag, GFP_KERNEL))) | |
675 | return -ENOMEM; | |
676 | ||
677 | buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; | |
678 | copied = copy_page_from_iter(alloc_frag->page, | |
679 | alloc_frag->offset + | |
680 | offsetof(struct tun_xdp_hdr, gso), | |
681 | sock_hlen, from); | |
682 | if (copied != sock_hlen) | |
683 | return -EFAULT; | |
684 | ||
685 | hdr = buf; | |
686 | gso = &hdr->gso; | |
687 | ||
688 | if ((gso->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
689 | vhost16_to_cpu(vq, gso->csum_start) + | |
690 | vhost16_to_cpu(vq, gso->csum_offset) + 2 > | |
691 | vhost16_to_cpu(vq, gso->hdr_len)) { | |
692 | gso->hdr_len = cpu_to_vhost16(vq, | |
693 | vhost16_to_cpu(vq, gso->csum_start) + | |
694 | vhost16_to_cpu(vq, gso->csum_offset) + 2); | |
695 | ||
696 | if (vhost16_to_cpu(vq, gso->hdr_len) > len) | |
697 | return -EINVAL; | |
698 | } | |
699 | ||
700 | len -= sock_hlen; | |
701 | copied = copy_page_from_iter(alloc_frag->page, | |
702 | alloc_frag->offset + pad, | |
703 | len, from); | |
704 | if (copied != len) | |
705 | return -EFAULT; | |
706 | ||
707 | xdp->data_hard_start = buf; | |
708 | xdp->data = buf + pad; | |
709 | xdp->data_end = xdp->data + len; | |
710 | hdr->buflen = buflen; | |
711 | ||
712 | get_page(alloc_frag->page); | |
713 | alloc_frag->offset += buflen; | |
714 | ||
715 | ++nvq->batched_xdp; | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
0d20bdf3 | 720 | static void handle_tx_copy(struct vhost_net *net, struct socket *sock) |
3a4d5c94 | 721 | { |
2839400f | 722 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; |
81f95a55 | 723 | struct vhost_virtqueue *vq = &nvq->vq; |
98a527aa | 724 | unsigned out, in; |
d5675bd2 | 725 | int head; |
3a4d5c94 MT |
726 | struct msghdr msg = { |
727 | .msg_name = NULL, | |
728 | .msg_namelen = 0, | |
729 | .msg_control = NULL, | |
730 | .msg_controllen = 0, | |
3a4d5c94 MT |
731 | .msg_flags = MSG_DONTWAIT, |
732 | }; | |
733 | size_t len, total_len = 0; | |
70181d51 | 734 | int err; |
a2ac9990 | 735 | int sent_pkts = 0; |
0a0be13b | 736 | bool sock_can_batch = (sock->sk->sk_sndbuf == INT_MAX); |
28457ee6 | 737 | |
0d20bdf3 JW |
738 | for (;;) { |
739 | bool busyloop_intr = false; | |
3a4d5c94 | 740 | |
0a0be13b JW |
741 | if (nvq->done_idx == VHOST_NET_BATCH) |
742 | vhost_tx_batch(net, nvq, sock, &msg); | |
743 | ||
0d20bdf3 JW |
744 | head = get_tx_bufs(net, nvq, &msg, &out, &in, &len, |
745 | &busyloop_intr); | |
746 | /* On error, stop handling until the next kick. */ | |
747 | if (unlikely(head < 0)) | |
748 | break; | |
749 | /* Nothing new? Wait for eventfd to tell us they refilled. */ | |
750 | if (head == vq->num) { | |
751 | if (unlikely(busyloop_intr)) { | |
752 | vhost_poll_queue(&vq->poll); | |
753 | } else if (unlikely(vhost_enable_notify(&net->dev, | |
754 | vq))) { | |
755 | vhost_disable_notify(&net->dev, vq); | |
756 | continue; | |
757 | } | |
758 | break; | |
759 | } | |
6b1e6cc7 | 760 | |
0d20bdf3 | 761 | total_len += len; |
0a0be13b JW |
762 | |
763 | /* For simplicity, TX batching is only enabled if | |
764 | * sndbuf is unlimited. | |
765 | */ | |
766 | if (sock_can_batch) { | |
767 | err = vhost_net_build_xdp(nvq, &msg.msg_iter); | |
768 | if (!err) { | |
769 | goto done; | |
770 | } else if (unlikely(err != -ENOSPC)) { | |
771 | vhost_tx_batch(net, nvq, sock, &msg); | |
772 | vhost_discard_vq_desc(vq, 1); | |
773 | vhost_net_enable_vq(net, vq); | |
774 | break; | |
775 | } | |
776 | ||
777 | /* We can't build XDP buff, go for single | |
778 | * packet path but let's flush batched | |
779 | * packets. | |
780 | */ | |
781 | vhost_tx_batch(net, nvq, sock, &msg); | |
782 | msg.msg_control = NULL; | |
783 | } else { | |
784 | if (tx_can_batch(vq, total_len)) | |
785 | msg.msg_flags |= MSG_MORE; | |
786 | else | |
787 | msg.msg_flags &= ~MSG_MORE; | |
788 | } | |
0d20bdf3 JW |
789 | |
790 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ | |
791 | err = sock->ops->sendmsg(sock, &msg, len); | |
792 | if (unlikely(err < 0)) { | |
793 | vhost_discard_vq_desc(vq, 1); | |
794 | vhost_net_enable_vq(net, vq); | |
795 | break; | |
796 | } | |
797 | if (err != len) | |
798 | pr_debug("Truncated TX packet: len %d != %zd\n", | |
799 | err, len); | |
0a0be13b JW |
800 | done: |
801 | vq->heads[nvq->done_idx].id = cpu_to_vhost32(vq, head); | |
802 | vq->heads[nvq->done_idx].len = 0; | |
803 | ++nvq->done_idx; | |
0d20bdf3 JW |
804 | if (vhost_exceeds_weight(++sent_pkts, total_len)) { |
805 | vhost_poll_queue(&vq->poll); | |
806 | break; | |
807 | } | |
808 | } | |
4afb52c2 | 809 | |
0a0be13b | 810 | vhost_tx_batch(net, nvq, sock, &msg); |
0d20bdf3 | 811 | } |
3a4d5c94 | 812 | |
0d20bdf3 JW |
813 | static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock) |
814 | { | |
815 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
816 | struct vhost_virtqueue *vq = &nvq->vq; | |
817 | unsigned out, in; | |
818 | int head; | |
819 | struct msghdr msg = { | |
820 | .msg_name = NULL, | |
821 | .msg_namelen = 0, | |
822 | .msg_control = NULL, | |
823 | .msg_controllen = 0, | |
824 | .msg_flags = MSG_DONTWAIT, | |
825 | }; | |
fe8dd45b | 826 | struct tun_msg_ctl ctl; |
0d20bdf3 JW |
827 | size_t len, total_len = 0; |
828 | int err; | |
829 | struct vhost_net_ubuf_ref *uninitialized_var(ubufs); | |
830 | bool zcopy_used; | |
831 | int sent_pkts = 0; | |
3a4d5c94 MT |
832 | |
833 | for (;;) { | |
027b1760 TM |
834 | bool busyloop_intr; |
835 | ||
bab632d6 | 836 | /* Release DMAs done buffers first */ |
0d20bdf3 | 837 | vhost_zerocopy_signal_used(net, vq); |
bab632d6 | 838 | |
027b1760 | 839 | busyloop_intr = false; |
a2a91a13 JW |
840 | head = get_tx_bufs(net, nvq, &msg, &out, &in, &len, |
841 | &busyloop_intr); | |
d5675bd2 | 842 | /* On error, stop handling until the next kick. */ |
7b3384fc | 843 | if (unlikely(head < 0)) |
d5675bd2 | 844 | break; |
3a4d5c94 MT |
845 | /* Nothing new? Wait for eventfd to tell us they refilled. */ |
846 | if (head == vq->num) { | |
027b1760 TM |
847 | if (unlikely(busyloop_intr)) { |
848 | vhost_poll_queue(&vq->poll); | |
849 | } else if (unlikely(vhost_enable_notify(&net->dev, vq))) { | |
8ea8cf89 | 850 | vhost_disable_notify(&net->dev, vq); |
3a4d5c94 MT |
851 | continue; |
852 | } | |
853 | break; | |
854 | } | |
ce21a029 | 855 | |
0d20bdf3 JW |
856 | zcopy_used = len >= VHOST_GOODCOPY_LEN |
857 | && !vhost_exceeds_maxpend(net) | |
858 | && vhost_net_tx_select_zcopy(net); | |
cedb9bdc | 859 | |
bab632d6 | 860 | /* use msg_control to pass vhost zerocopy ubuf info to skb */ |
cedb9bdc | 861 | if (zcopy_used) { |
ce21a029 JW |
862 | struct ubuf_info *ubuf; |
863 | ubuf = nvq->ubuf_info + nvq->upend_idx; | |
864 | ||
8b38694a | 865 | vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); |
ce21a029 JW |
866 | vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; |
867 | ubuf->callback = vhost_zerocopy_callback; | |
868 | ubuf->ctx = nvq->ubufs; | |
869 | ubuf->desc = nvq->upend_idx; | |
c1d1b437 | 870 | refcount_set(&ubuf->refcnt, 1); |
fe8dd45b JW |
871 | msg.msg_control = &ctl; |
872 | ctl.type = TUN_MSG_UBUF; | |
873 | ctl.ptr = ubuf; | |
874 | msg.msg_controllen = sizeof(ctl); | |
ce21a029 | 875 | ubufs = nvq->ubufs; |
0ad8b480 | 876 | atomic_inc(&ubufs->refcount); |
2839400f | 877 | nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV; |
ce21a029 | 878 | } else { |
4364d5f9 | 879 | msg.msg_control = NULL; |
ce21a029 JW |
880 | ubufs = NULL; |
881 | } | |
0ed005ce | 882 | total_len += len; |
c92a8a8c | 883 | if (tx_can_batch(vq, total_len) && |
0ed005ce JW |
884 | likely(!vhost_exceeds_maxpend(net))) { |
885 | msg.msg_flags |= MSG_MORE; | |
886 | } else { | |
887 | msg.msg_flags &= ~MSG_MORE; | |
888 | } | |
889 | ||
3a4d5c94 | 890 | /* TODO: Check specific error and bomb out unless ENOBUFS? */ |
1b784140 | 891 | err = sock->ops->sendmsg(sock, &msg, len); |
3a4d5c94 | 892 | if (unlikely(err < 0)) { |
cedb9bdc | 893 | if (zcopy_used) { |
ce21a029 | 894 | vhost_net_ubuf_put(ubufs); |
2839400f AH |
895 | nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) |
896 | % UIO_MAXIOV; | |
bab632d6 | 897 | } |
8dd014ad | 898 | vhost_discard_vq_desc(vq, 1); |
feb8892c | 899 | vhost_net_enable_vq(net, vq); |
3a4d5c94 MT |
900 | break; |
901 | } | |
902 | if (err != len) | |
95c0ec6a MT |
903 | pr_debug("Truncated TX packet: " |
904 | " len %d != %zd\n", err, len); | |
cedb9bdc | 905 | if (!zcopy_used) |
bab632d6 | 906 | vhost_add_used_and_signal(&net->dev, vq, head, 0); |
c8fb217a | 907 | else |
eaae8132 | 908 | vhost_zerocopy_signal_used(net, vq); |
eaae8132 | 909 | vhost_net_tx_packet(net); |
272f35cb | 910 | if (unlikely(vhost_exceeds_weight(++sent_pkts, total_len))) { |
3a4d5c94 MT |
911 | vhost_poll_queue(&vq->poll); |
912 | break; | |
913 | } | |
914 | } | |
0d20bdf3 JW |
915 | } |
916 | ||
917 | /* Expects to be always run from workqueue - which acts as | |
918 | * read-size critical section for our kind of RCU. */ | |
919 | static void handle_tx(struct vhost_net *net) | |
920 | { | |
921 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; | |
922 | struct vhost_virtqueue *vq = &nvq->vq; | |
923 | struct socket *sock; | |
924 | ||
a6a67a2f | 925 | mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_TX); |
0d20bdf3 JW |
926 | sock = vq->private_data; |
927 | if (!sock) | |
928 | goto out; | |
929 | ||
930 | if (!vq_iotlb_prefetch(vq)) | |
931 | goto out; | |
932 | ||
933 | vhost_disable_notify(&net->dev, vq); | |
934 | vhost_net_disable_vq(net, vq); | |
935 | ||
936 | if (vhost_sock_zcopy(sock)) | |
937 | handle_tx_zerocopy(net, sock); | |
938 | else | |
939 | handle_tx_copy(net, sock); | |
940 | ||
2e26af79 | 941 | out: |
3a4d5c94 | 942 | mutex_unlock(&vq->mutex); |
3a4d5c94 MT |
943 | } |
944 | ||
c67df11f | 945 | static int peek_head_len(struct vhost_net_virtqueue *rvq, struct sock *sk) |
8dd014ad DS |
946 | { |
947 | struct sk_buff *head; | |
948 | int len = 0; | |
783e3988 | 949 | unsigned long flags; |
8dd014ad | 950 | |
5990a305 | 951 | if (rvq->rx_ring) |
c67df11f | 952 | return vhost_net_buf_peek(rvq); |
1576d986 | 953 | |
783e3988 | 954 | spin_lock_irqsave(&sk->sk_receive_queue.lock, flags); |
8dd014ad | 955 | head = skb_peek(&sk->sk_receive_queue); |
c53cff5e | 956 | if (likely(head)) { |
8dd014ad | 957 | len = head->len; |
df8a39de | 958 | if (skb_vlan_tag_present(head)) |
c53cff5e BG |
959 | len += VLAN_HLEN; |
960 | } | |
961 | ||
783e3988 | 962 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, flags); |
8dd014ad DS |
963 | return len; |
964 | } | |
965 | ||
be294a51 TM |
966 | static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk, |
967 | bool *busyloop_intr) | |
03088137 | 968 | { |
28b9b33b TM |
969 | struct vhost_net_virtqueue *rnvq = &net->vqs[VHOST_NET_VQ_RX]; |
970 | struct vhost_net_virtqueue *tnvq = &net->vqs[VHOST_NET_VQ_TX]; | |
6369fec5 | 971 | struct vhost_virtqueue *rvq = &rnvq->vq; |
28b9b33b | 972 | struct vhost_virtqueue *tvq = &tnvq->vq; |
28b9b33b | 973 | int len = peek_head_len(rnvq, sk); |
03088137 | 974 | |
dc151282 | 975 | if (!len && rvq->busyloop_timeout) { |
f5a4941a | 976 | /* Flush batched heads first */ |
09c32489 | 977 | vhost_net_signal_used(rnvq); |
03088137 | 978 | /* Both tx vq and rx socket were polled here */ |
dc151282 | 979 | vhost_net_busy_poll(net, rvq, tvq, busyloop_intr, true); |
03088137 | 980 | |
28b9b33b | 981 | len = peek_head_len(rnvq, sk); |
03088137 JW |
982 | } |
983 | ||
984 | return len; | |
985 | } | |
986 | ||
8dd014ad DS |
987 | /* This is a multi-buffer version of vhost_get_desc, that works if |
988 | * vq has read descriptors only. | |
989 | * @vq - the relevant virtqueue | |
990 | * @datalen - data length we'll be reading | |
991 | * @iovcount - returned count of io vectors we fill | |
992 | * @log - vhost log | |
993 | * @log_num - log offset | |
94249369 | 994 | * @quota - headcount quota, 1 for big buffer |
8dd014ad DS |
995 | * returns number of buffer heads allocated, negative on error |
996 | */ | |
997 | static int get_rx_bufs(struct vhost_virtqueue *vq, | |
998 | struct vring_used_elem *heads, | |
999 | int datalen, | |
1000 | unsigned *iovcount, | |
1001 | struct vhost_log *log, | |
94249369 JW |
1002 | unsigned *log_num, |
1003 | unsigned int quota) | |
8dd014ad DS |
1004 | { |
1005 | unsigned int out, in; | |
1006 | int seg = 0; | |
1007 | int headcount = 0; | |
1008 | unsigned d; | |
1009 | int r, nlogs = 0; | |
8b38694a MT |
1010 | /* len is always initialized before use since we are always called with |
1011 | * datalen > 0. | |
1012 | */ | |
1013 | u32 uninitialized_var(len); | |
8dd014ad | 1014 | |
94249369 | 1015 | while (datalen > 0 && headcount < quota) { |
e0e9b406 | 1016 | if (unlikely(seg >= UIO_MAXIOV)) { |
8dd014ad DS |
1017 | r = -ENOBUFS; |
1018 | goto err; | |
1019 | } | |
47283bef | 1020 | r = vhost_get_vq_desc(vq, vq->iov + seg, |
8dd014ad DS |
1021 | ARRAY_SIZE(vq->iov) - seg, &out, |
1022 | &in, log, log_num); | |
a39ee449 MT |
1023 | if (unlikely(r < 0)) |
1024 | goto err; | |
1025 | ||
1026 | d = r; | |
8dd014ad DS |
1027 | if (d == vq->num) { |
1028 | r = 0; | |
1029 | goto err; | |
1030 | } | |
1031 | if (unlikely(out || in <= 0)) { | |
1032 | vq_err(vq, "unexpected descriptor format for RX: " | |
1033 | "out %d, in %d\n", out, in); | |
1034 | r = -EINVAL; | |
1035 | goto err; | |
1036 | } | |
1037 | if (unlikely(log)) { | |
1038 | nlogs += *log_num; | |
1039 | log += *log_num; | |
1040 | } | |
8b38694a MT |
1041 | heads[headcount].id = cpu_to_vhost32(vq, d); |
1042 | len = iov_length(vq->iov + seg, in); | |
1043 | heads[headcount].len = cpu_to_vhost32(vq, len); | |
1044 | datalen -= len; | |
8dd014ad DS |
1045 | ++headcount; |
1046 | seg += in; | |
1047 | } | |
99975cc6 | 1048 | heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); |
8dd014ad DS |
1049 | *iovcount = seg; |
1050 | if (unlikely(log)) | |
1051 | *log_num = nlogs; | |
d8316f39 MT |
1052 | |
1053 | /* Detect overrun */ | |
1054 | if (unlikely(datalen > 0)) { | |
1055 | r = UIO_MAXIOV + 1; | |
1056 | goto err; | |
1057 | } | |
8dd014ad DS |
1058 | return headcount; |
1059 | err: | |
1060 | vhost_discard_vq_desc(vq, headcount); | |
1061 | return r; | |
1062 | } | |
1063 | ||
3a4d5c94 MT |
1064 | /* Expects to be always run from workqueue - which acts as |
1065 | * read-size critical section for our kind of RCU. */ | |
94249369 | 1066 | static void handle_rx(struct vhost_net *net) |
3a4d5c94 | 1067 | { |
81f95a55 MT |
1068 | struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX]; |
1069 | struct vhost_virtqueue *vq = &nvq->vq; | |
8dd014ad DS |
1070 | unsigned uninitialized_var(in), log; |
1071 | struct vhost_log *vq_log; | |
1072 | struct msghdr msg = { | |
1073 | .msg_name = NULL, | |
1074 | .msg_namelen = 0, | |
1075 | .msg_control = NULL, /* FIXME: get and handle RX aux data. */ | |
1076 | .msg_controllen = 0, | |
8dd014ad DS |
1077 | .msg_flags = MSG_DONTWAIT, |
1078 | }; | |
0960b641 JW |
1079 | struct virtio_net_hdr hdr = { |
1080 | .flags = 0, | |
1081 | .gso_type = VIRTIO_NET_HDR_GSO_NONE | |
8dd014ad | 1082 | }; |
8dd014ad | 1083 | size_t total_len = 0; |
910a578f | 1084 | int err, mergeable; |
f5a4941a | 1085 | s16 headcount; |
8dd014ad DS |
1086 | size_t vhost_hlen, sock_hlen; |
1087 | size_t vhost_len, sock_len; | |
be294a51 | 1088 | bool busyloop_intr = false; |
2e26af79 | 1089 | struct socket *sock; |
ba7438ae | 1090 | struct iov_iter fixup; |
0960b641 | 1091 | __virtio16 num_buffers; |
db688c24 | 1092 | int recv_pkts = 0; |
8dd014ad | 1093 | |
a6a67a2f | 1094 | mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_RX); |
2e26af79 AH |
1095 | sock = vq->private_data; |
1096 | if (!sock) | |
1097 | goto out; | |
6b1e6cc7 JW |
1098 | |
1099 | if (!vq_iotlb_prefetch(vq)) | |
1100 | goto out; | |
1101 | ||
8ea8cf89 | 1102 | vhost_disable_notify(&net->dev, vq); |
8241a1e4 | 1103 | vhost_net_disable_vq(net, vq); |
2e26af79 | 1104 | |
81f95a55 MT |
1105 | vhost_hlen = nvq->vhost_hlen; |
1106 | sock_hlen = nvq->sock_hlen; | |
8dd014ad | 1107 | |
ea16c514 | 1108 | vq_log = unlikely(vhost_has_feature(vq, VHOST_F_LOG_ALL)) ? |
8dd014ad | 1109 | vq->log : NULL; |
ea16c514 | 1110 | mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF); |
8dd014ad | 1111 | |
be294a51 TM |
1112 | while ((sock_len = vhost_net_rx_peek_head_len(net, sock->sk, |
1113 | &busyloop_intr))) { | |
8dd014ad DS |
1114 | sock_len += sock_hlen; |
1115 | vhost_len = sock_len + vhost_hlen; | |
f5a4941a JW |
1116 | headcount = get_rx_bufs(vq, vq->heads + nvq->done_idx, |
1117 | vhost_len, &in, vq_log, &log, | |
94249369 | 1118 | likely(mergeable) ? UIO_MAXIOV : 1); |
8dd014ad DS |
1119 | /* On error, stop handling until the next kick. */ |
1120 | if (unlikely(headcount < 0)) | |
8241a1e4 | 1121 | goto out; |
8dd014ad DS |
1122 | /* OK, now we need to know about added descriptors. */ |
1123 | if (!headcount) { | |
6369fec5 TM |
1124 | if (unlikely(busyloop_intr)) { |
1125 | vhost_poll_queue(&vq->poll); | |
1126 | } else if (unlikely(vhost_enable_notify(&net->dev, vq))) { | |
8dd014ad DS |
1127 | /* They have slipped one in as we were |
1128 | * doing that: check again. */ | |
8ea8cf89 | 1129 | vhost_disable_notify(&net->dev, vq); |
8dd014ad DS |
1130 | continue; |
1131 | } | |
1132 | /* Nothing new? Wait for eventfd to tell us | |
1133 | * they refilled. */ | |
8241a1e4 | 1134 | goto out; |
8dd014ad | 1135 | } |
6369fec5 | 1136 | busyloop_intr = false; |
5990a305 | 1137 | if (nvq->rx_ring) |
6e474083 WX |
1138 | msg.msg_control = vhost_net_buf_consume(&nvq->rxq); |
1139 | /* On overrun, truncate and discard */ | |
1140 | if (unlikely(headcount > UIO_MAXIOV)) { | |
1141 | iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); | |
1142 | err = sock->ops->recvmsg(sock, &msg, | |
1143 | 1, MSG_DONTWAIT | MSG_TRUNC); | |
1144 | pr_debug("Discarded rx packet: len %zd\n", sock_len); | |
1145 | continue; | |
1146 | } | |
8dd014ad | 1147 | /* We don't need to be notified again. */ |
ba7438ae AV |
1148 | iov_iter_init(&msg.msg_iter, READ, vq->iov, in, vhost_len); |
1149 | fixup = msg.msg_iter; | |
1150 | if (unlikely((vhost_hlen))) { | |
1151 | /* We will supply the header ourselves | |
1152 | * TODO: support TSO. | |
1153 | */ | |
1154 | iov_iter_advance(&msg.msg_iter, vhost_hlen); | |
ba7438ae | 1155 | } |
1b784140 | 1156 | err = sock->ops->recvmsg(sock, &msg, |
8dd014ad DS |
1157 | sock_len, MSG_DONTWAIT | MSG_TRUNC); |
1158 | /* Userspace might have consumed the packet meanwhile: | |
1159 | * it's not supposed to do this usually, but might be hard | |
1160 | * to prevent. Discard data we got (if any) and keep going. */ | |
1161 | if (unlikely(err != sock_len)) { | |
1162 | pr_debug("Discarded rx packet: " | |
1163 | " len %d, expected %zd\n", err, sock_len); | |
1164 | vhost_discard_vq_desc(vq, headcount); | |
1165 | continue; | |
1166 | } | |
ba7438ae | 1167 | /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ |
4c5a8442 MT |
1168 | if (unlikely(vhost_hlen)) { |
1169 | if (copy_to_iter(&hdr, sizeof(hdr), | |
1170 | &fixup) != sizeof(hdr)) { | |
1171 | vq_err(vq, "Unable to write vnet_hdr " | |
1172 | "at addr %p\n", vq->iov->iov_base); | |
8241a1e4 | 1173 | goto out; |
4c5a8442 MT |
1174 | } |
1175 | } else { | |
1176 | /* Header came from socket; we'll need to patch | |
1177 | * ->num_buffers over if VIRTIO_NET_F_MRG_RXBUF | |
1178 | */ | |
1179 | iov_iter_advance(&fixup, sizeof(hdr)); | |
8dd014ad DS |
1180 | } |
1181 | /* TODO: Should check and handle checksum. */ | |
5201aa49 | 1182 | |
0960b641 | 1183 | num_buffers = cpu_to_vhost16(vq, headcount); |
cfbdab95 | 1184 | if (likely(mergeable) && |
0d79a493 MT |
1185 | copy_to_iter(&num_buffers, sizeof num_buffers, |
1186 | &fixup) != sizeof num_buffers) { | |
8dd014ad DS |
1187 | vq_err(vq, "Failed num_buffers write"); |
1188 | vhost_discard_vq_desc(vq, headcount); | |
8241a1e4 | 1189 | goto out; |
8dd014ad | 1190 | } |
f5a4941a | 1191 | nvq->done_idx += headcount; |
d0d86971 | 1192 | if (nvq->done_idx > VHOST_NET_BATCH) |
09c32489 | 1193 | vhost_net_signal_used(nvq); |
8dd014ad DS |
1194 | if (unlikely(vq_log)) |
1195 | vhost_log_write(vq, vq_log, log, vhost_len); | |
1196 | total_len += vhost_len; | |
272f35cb | 1197 | if (unlikely(vhost_exceeds_weight(++recv_pkts, total_len))) { |
8dd014ad | 1198 | vhost_poll_queue(&vq->poll); |
8241a1e4 | 1199 | goto out; |
8dd014ad DS |
1200 | } |
1201 | } | |
be294a51 TM |
1202 | if (unlikely(busyloop_intr)) |
1203 | vhost_poll_queue(&vq->poll); | |
1204 | else | |
1205 | vhost_net_enable_vq(net, vq); | |
2e26af79 | 1206 | out: |
09c32489 | 1207 | vhost_net_signal_used(nvq); |
8dd014ad | 1208 | mutex_unlock(&vq->mutex); |
8dd014ad DS |
1209 | } |
1210 | ||
c23f3445 | 1211 | static void handle_tx_kick(struct vhost_work *work) |
3a4d5c94 | 1212 | { |
c23f3445 TH |
1213 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1214 | poll.work); | |
1215 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
1216 | ||
3a4d5c94 MT |
1217 | handle_tx(net); |
1218 | } | |
1219 | ||
c23f3445 | 1220 | static void handle_rx_kick(struct vhost_work *work) |
3a4d5c94 | 1221 | { |
c23f3445 TH |
1222 | struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, |
1223 | poll.work); | |
1224 | struct vhost_net *net = container_of(vq->dev, struct vhost_net, dev); | |
1225 | ||
3a4d5c94 MT |
1226 | handle_rx(net); |
1227 | } | |
1228 | ||
c23f3445 | 1229 | static void handle_tx_net(struct vhost_work *work) |
3a4d5c94 | 1230 | { |
c23f3445 TH |
1231 | struct vhost_net *net = container_of(work, struct vhost_net, |
1232 | poll[VHOST_NET_VQ_TX].work); | |
3a4d5c94 MT |
1233 | handle_tx(net); |
1234 | } | |
1235 | ||
c23f3445 | 1236 | static void handle_rx_net(struct vhost_work *work) |
3a4d5c94 | 1237 | { |
c23f3445 TH |
1238 | struct vhost_net *net = container_of(work, struct vhost_net, |
1239 | poll[VHOST_NET_VQ_RX].work); | |
3a4d5c94 MT |
1240 | handle_rx(net); |
1241 | } | |
1242 | ||
1243 | static int vhost_net_open(struct inode *inode, struct file *f) | |
1244 | { | |
23cc5a99 | 1245 | struct vhost_net *n; |
c23f3445 | 1246 | struct vhost_dev *dev; |
3ab2e420 | 1247 | struct vhost_virtqueue **vqs; |
5990a305 | 1248 | void **queue; |
0a0be13b | 1249 | struct xdp_buff *xdp; |
59566b6e | 1250 | int i; |
c23f3445 | 1251 | |
dcda9b04 | 1252 | n = kvmalloc(sizeof *n, GFP_KERNEL | __GFP_RETRY_MAYFAIL); |
6c5ab651 MH |
1253 | if (!n) |
1254 | return -ENOMEM; | |
6da2ec56 | 1255 | vqs = kmalloc_array(VHOST_NET_VQ_MAX, sizeof(*vqs), GFP_KERNEL); |
3ab2e420 | 1256 | if (!vqs) { |
d04257b0 | 1257 | kvfree(n); |
3ab2e420 AH |
1258 | return -ENOMEM; |
1259 | } | |
c23f3445 | 1260 | |
d0d86971 | 1261 | queue = kmalloc_array(VHOST_NET_BATCH, sizeof(void *), |
c67df11f JW |
1262 | GFP_KERNEL); |
1263 | if (!queue) { | |
1264 | kfree(vqs); | |
1265 | kvfree(n); | |
1266 | return -ENOMEM; | |
1267 | } | |
1268 | n->vqs[VHOST_NET_VQ_RX].rxq.queue = queue; | |
1269 | ||
0a0be13b JW |
1270 | xdp = kmalloc_array(VHOST_NET_BATCH, sizeof(*xdp), GFP_KERNEL); |
1271 | if (!xdp) { | |
1272 | kfree(vqs); | |
1273 | kvfree(n); | |
1274 | kfree(queue); | |
8a1aff14 | 1275 | return -ENOMEM; |
0a0be13b JW |
1276 | } |
1277 | n->vqs[VHOST_NET_VQ_TX].xdp = xdp; | |
1278 | ||
c23f3445 | 1279 | dev = &n->dev; |
3ab2e420 AH |
1280 | vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq; |
1281 | vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq; | |
1282 | n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; | |
1283 | n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; | |
2839400f AH |
1284 | for (i = 0; i < VHOST_NET_VQ_MAX; i++) { |
1285 | n->vqs[i].ubufs = NULL; | |
1286 | n->vqs[i].ubuf_info = NULL; | |
1287 | n->vqs[i].upend_idx = 0; | |
1288 | n->vqs[i].done_idx = 0; | |
0a0be13b | 1289 | n->vqs[i].batched_xdp = 0; |
81f95a55 MT |
1290 | n->vqs[i].vhost_hlen = 0; |
1291 | n->vqs[i].sock_hlen = 0; | |
ab7e34b3 | 1292 | n->vqs[i].rx_ring = NULL; |
c67df11f | 1293 | vhost_net_buf_init(&n->vqs[i].rxq); |
2839400f | 1294 | } |
59566b6e | 1295 | vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX); |
3a4d5c94 | 1296 | |
a9a08845 LT |
1297 | vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, EPOLLOUT, dev); |
1298 | vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, EPOLLIN, dev); | |
3a4d5c94 MT |
1299 | |
1300 | f->private_data = n; | |
1301 | ||
1302 | return 0; | |
1303 | } | |
1304 | ||
3a4d5c94 MT |
1305 | static struct socket *vhost_net_stop_vq(struct vhost_net *n, |
1306 | struct vhost_virtqueue *vq) | |
1307 | { | |
1308 | struct socket *sock; | |
c67df11f JW |
1309 | struct vhost_net_virtqueue *nvq = |
1310 | container_of(vq, struct vhost_net_virtqueue, vq); | |
3a4d5c94 MT |
1311 | |
1312 | mutex_lock(&vq->mutex); | |
22fa90c7 | 1313 | sock = vq->private_data; |
3a4d5c94 | 1314 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 1315 | vq->private_data = NULL; |
c67df11f | 1316 | vhost_net_buf_unproduce(nvq); |
303fd71b | 1317 | nvq->rx_ring = NULL; |
3a4d5c94 MT |
1318 | mutex_unlock(&vq->mutex); |
1319 | return sock; | |
1320 | } | |
1321 | ||
1322 | static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock, | |
1323 | struct socket **rx_sock) | |
1324 | { | |
3ab2e420 AH |
1325 | *tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq); |
1326 | *rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq); | |
3a4d5c94 MT |
1327 | } |
1328 | ||
1329 | static void vhost_net_flush_vq(struct vhost_net *n, int index) | |
1330 | { | |
1331 | vhost_poll_flush(n->poll + index); | |
3ab2e420 | 1332 | vhost_poll_flush(&n->vqs[index].vq.poll); |
3a4d5c94 MT |
1333 | } |
1334 | ||
1335 | static void vhost_net_flush(struct vhost_net *n) | |
1336 | { | |
1337 | vhost_net_flush_vq(n, VHOST_NET_VQ_TX); | |
1338 | vhost_net_flush_vq(n, VHOST_NET_VQ_RX); | |
2839400f | 1339 | if (n->vqs[VHOST_NET_VQ_TX].ubufs) { |
3ab2e420 | 1340 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1341 | n->tx_flush = true; |
3ab2e420 | 1342 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1343 | /* Wait for all lower device DMAs done. */ |
fe729a57 | 1344 | vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs); |
3ab2e420 | 1345 | mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1346 | n->tx_flush = false; |
0ad8b480 | 1347 | atomic_set(&n->vqs[VHOST_NET_VQ_TX].ubufs->refcount, 1); |
3ab2e420 | 1348 | mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex); |
1280c27f | 1349 | } |
3a4d5c94 MT |
1350 | } |
1351 | ||
1352 | static int vhost_net_release(struct inode *inode, struct file *f) | |
1353 | { | |
1354 | struct vhost_net *n = f->private_data; | |
1355 | struct socket *tx_sock; | |
1356 | struct socket *rx_sock; | |
1357 | ||
1358 | vhost_net_stop(n, &tx_sock, &rx_sock); | |
1359 | vhost_net_flush(n); | |
b211616d | 1360 | vhost_dev_stop(&n->dev); |
f6f93f75 | 1361 | vhost_dev_cleanup(&n->dev); |
81f95a55 | 1362 | vhost_net_vq_reset(n); |
3a4d5c94 | 1363 | if (tx_sock) |
09aaacf0 | 1364 | sockfd_put(tx_sock); |
3a4d5c94 | 1365 | if (rx_sock) |
09aaacf0 | 1366 | sockfd_put(rx_sock); |
b0c057ca MT |
1367 | /* Make sure no callbacks are outstanding */ |
1368 | synchronize_rcu_bh(); | |
3a4d5c94 MT |
1369 | /* We do an extra flush before freeing memory, |
1370 | * since jobs can re-queue themselves. */ | |
1371 | vhost_net_flush(n); | |
c67df11f | 1372 | kfree(n->vqs[VHOST_NET_VQ_RX].rxq.queue); |
0a0be13b | 1373 | kfree(n->vqs[VHOST_NET_VQ_TX].xdp); |
3ab2e420 | 1374 | kfree(n->dev.vqs); |
d04257b0 | 1375 | kvfree(n); |
3a4d5c94 MT |
1376 | return 0; |
1377 | } | |
1378 | ||
1379 | static struct socket *get_raw_socket(int fd) | |
1380 | { | |
1381 | struct { | |
1382 | struct sockaddr_ll sa; | |
1383 | char buf[MAX_ADDR_LEN]; | |
1384 | } uaddr; | |
9b2c45d4 | 1385 | int r; |
3a4d5c94 | 1386 | struct socket *sock = sockfd_lookup(fd, &r); |
d47effe1 | 1387 | |
3a4d5c94 MT |
1388 | if (!sock) |
1389 | return ERR_PTR(-ENOTSOCK); | |
1390 | ||
1391 | /* Parameter checking */ | |
1392 | if (sock->sk->sk_type != SOCK_RAW) { | |
1393 | r = -ESOCKTNOSUPPORT; | |
1394 | goto err; | |
1395 | } | |
1396 | ||
9b2c45d4 DV |
1397 | r = sock->ops->getname(sock, (struct sockaddr *)&uaddr.sa, 0); |
1398 | if (r < 0) | |
3a4d5c94 MT |
1399 | goto err; |
1400 | ||
1401 | if (uaddr.sa.sll_family != AF_PACKET) { | |
1402 | r = -EPFNOSUPPORT; | |
1403 | goto err; | |
1404 | } | |
1405 | return sock; | |
1406 | err: | |
09aaacf0 | 1407 | sockfd_put(sock); |
3a4d5c94 MT |
1408 | return ERR_PTR(r); |
1409 | } | |
1410 | ||
5990a305 | 1411 | static struct ptr_ring *get_tap_ptr_ring(int fd) |
c67df11f | 1412 | { |
5990a305 | 1413 | struct ptr_ring *ring; |
c67df11f JW |
1414 | struct file *file = fget(fd); |
1415 | ||
1416 | if (!file) | |
1417 | return NULL; | |
5990a305 JW |
1418 | ring = tun_get_tx_ring(file); |
1419 | if (!IS_ERR(ring)) | |
c67df11f | 1420 | goto out; |
5990a305 JW |
1421 | ring = tap_get_ptr_ring(file); |
1422 | if (!IS_ERR(ring)) | |
c67df11f | 1423 | goto out; |
5990a305 | 1424 | ring = NULL; |
c67df11f JW |
1425 | out: |
1426 | fput(file); | |
5990a305 | 1427 | return ring; |
c67df11f JW |
1428 | } |
1429 | ||
501c774c | 1430 | static struct socket *get_tap_socket(int fd) |
3a4d5c94 MT |
1431 | { |
1432 | struct file *file = fget(fd); | |
1433 | struct socket *sock; | |
d47effe1 | 1434 | |
3a4d5c94 MT |
1435 | if (!file) |
1436 | return ERR_PTR(-EBADF); | |
1437 | sock = tun_get_socket(file); | |
501c774c AB |
1438 | if (!IS_ERR(sock)) |
1439 | return sock; | |
635b8c8e | 1440 | sock = tap_get_socket(file); |
3a4d5c94 MT |
1441 | if (IS_ERR(sock)) |
1442 | fput(file); | |
1443 | return sock; | |
1444 | } | |
1445 | ||
1446 | static struct socket *get_socket(int fd) | |
1447 | { | |
1448 | struct socket *sock; | |
d47effe1 | 1449 | |
3a4d5c94 MT |
1450 | /* special case to disable backend */ |
1451 | if (fd == -1) | |
1452 | return NULL; | |
1453 | sock = get_raw_socket(fd); | |
1454 | if (!IS_ERR(sock)) | |
1455 | return sock; | |
501c774c | 1456 | sock = get_tap_socket(fd); |
3a4d5c94 MT |
1457 | if (!IS_ERR(sock)) |
1458 | return sock; | |
1459 | return ERR_PTR(-ENOTSOCK); | |
1460 | } | |
1461 | ||
1462 | static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) | |
1463 | { | |
1464 | struct socket *sock, *oldsock; | |
1465 | struct vhost_virtqueue *vq; | |
2839400f | 1466 | struct vhost_net_virtqueue *nvq; |
fe729a57 | 1467 | struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL; |
3a4d5c94 MT |
1468 | int r; |
1469 | ||
1470 | mutex_lock(&n->dev.mutex); | |
1471 | r = vhost_dev_check_owner(&n->dev); | |
1472 | if (r) | |
1473 | goto err; | |
1474 | ||
1475 | if (index >= VHOST_NET_VQ_MAX) { | |
1476 | r = -ENOBUFS; | |
1477 | goto err; | |
1478 | } | |
3ab2e420 | 1479 | vq = &n->vqs[index].vq; |
2839400f | 1480 | nvq = &n->vqs[index]; |
3a4d5c94 MT |
1481 | mutex_lock(&vq->mutex); |
1482 | ||
1483 | /* Verify that ring has been setup correctly. */ | |
1484 | if (!vhost_vq_access_ok(vq)) { | |
1485 | r = -EFAULT; | |
1dace8c8 | 1486 | goto err_vq; |
3a4d5c94 MT |
1487 | } |
1488 | sock = get_socket(fd); | |
1489 | if (IS_ERR(sock)) { | |
1490 | r = PTR_ERR(sock); | |
1dace8c8 | 1491 | goto err_vq; |
3a4d5c94 MT |
1492 | } |
1493 | ||
1494 | /* start polling new socket */ | |
22fa90c7 | 1495 | oldsock = vq->private_data; |
11fe8839 | 1496 | if (sock != oldsock) { |
fe729a57 AH |
1497 | ubufs = vhost_net_ubuf_alloc(vq, |
1498 | sock && vhost_sock_zcopy(sock)); | |
bab632d6 MT |
1499 | if (IS_ERR(ubufs)) { |
1500 | r = PTR_ERR(ubufs); | |
1501 | goto err_ubufs; | |
1502 | } | |
692a998b | 1503 | |
d47effe1 | 1504 | vhost_net_disable_vq(n, vq); |
22fa90c7 | 1505 | vq->private_data = sock; |
c67df11f | 1506 | vhost_net_buf_unproduce(nvq); |
80f7d030 | 1507 | r = vhost_vq_init_access(vq); |
f59281da | 1508 | if (r) |
692a998b | 1509 | goto err_used; |
2b8b328b JW |
1510 | r = vhost_net_enable_vq(n, vq); |
1511 | if (r) | |
1512 | goto err_used; | |
303fd71b JW |
1513 | if (index == VHOST_NET_VQ_RX) |
1514 | nvq->rx_ring = get_tap_ptr_ring(fd); | |
692a998b | 1515 | |
2839400f AH |
1516 | oldubufs = nvq->ubufs; |
1517 | nvq->ubufs = ubufs; | |
64e9a9b8 MT |
1518 | |
1519 | n->tx_packets = 0; | |
1520 | n->tx_zcopy_err = 0; | |
1280c27f | 1521 | n->tx_flush = false; |
dd1f4078 | 1522 | } |
3a4d5c94 | 1523 | |
1680e906 MT |
1524 | mutex_unlock(&vq->mutex); |
1525 | ||
c047e5f3 | 1526 | if (oldubufs) { |
c38e39c3 | 1527 | vhost_net_ubuf_put_wait_and_free(oldubufs); |
c047e5f3 | 1528 | mutex_lock(&vq->mutex); |
eaae8132 | 1529 | vhost_zerocopy_signal_used(n, vq); |
c047e5f3 MT |
1530 | mutex_unlock(&vq->mutex); |
1531 | } | |
bab632d6 | 1532 | |
3a4d5c94 MT |
1533 | if (oldsock) { |
1534 | vhost_net_flush_vq(n, index); | |
09aaacf0 | 1535 | sockfd_put(oldsock); |
3a4d5c94 | 1536 | } |
1dace8c8 | 1537 | |
1680e906 MT |
1538 | mutex_unlock(&n->dev.mutex); |
1539 | return 0; | |
1540 | ||
692a998b | 1541 | err_used: |
22fa90c7 | 1542 | vq->private_data = oldsock; |
692a998b JW |
1543 | vhost_net_enable_vq(n, vq); |
1544 | if (ubufs) | |
c38e39c3 | 1545 | vhost_net_ubuf_put_wait_and_free(ubufs); |
bab632d6 | 1546 | err_ubufs: |
b8f1f658 JW |
1547 | if (sock) |
1548 | sockfd_put(sock); | |
1dace8c8 JD |
1549 | err_vq: |
1550 | mutex_unlock(&vq->mutex); | |
3a4d5c94 MT |
1551 | err: |
1552 | mutex_unlock(&n->dev.mutex); | |
1553 | return r; | |
1554 | } | |
1555 | ||
1556 | static long vhost_net_reset_owner(struct vhost_net *n) | |
1557 | { | |
1558 | struct socket *tx_sock = NULL; | |
1559 | struct socket *rx_sock = NULL; | |
1560 | long err; | |
a9709d68 | 1561 | struct vhost_umem *umem; |
d47effe1 | 1562 | |
3a4d5c94 MT |
1563 | mutex_lock(&n->dev.mutex); |
1564 | err = vhost_dev_check_owner(&n->dev); | |
1565 | if (err) | |
1566 | goto done; | |
a9709d68 JW |
1567 | umem = vhost_dev_reset_owner_prepare(); |
1568 | if (!umem) { | |
150b9e51 MT |
1569 | err = -ENOMEM; |
1570 | goto done; | |
1571 | } | |
3a4d5c94 MT |
1572 | vhost_net_stop(n, &tx_sock, &rx_sock); |
1573 | vhost_net_flush(n); | |
4cd87951 | 1574 | vhost_dev_stop(&n->dev); |
a9709d68 | 1575 | vhost_dev_reset_owner(&n->dev, umem); |
81f95a55 | 1576 | vhost_net_vq_reset(n); |
3a4d5c94 MT |
1577 | done: |
1578 | mutex_unlock(&n->dev.mutex); | |
1579 | if (tx_sock) | |
09aaacf0 | 1580 | sockfd_put(tx_sock); |
3a4d5c94 | 1581 | if (rx_sock) |
09aaacf0 | 1582 | sockfd_put(rx_sock); |
3a4d5c94 MT |
1583 | return err; |
1584 | } | |
1585 | ||
429711ae JW |
1586 | static int vhost_net_set_backend_features(struct vhost_net *n, u64 features) |
1587 | { | |
1588 | int i; | |
1589 | ||
1590 | mutex_lock(&n->dev.mutex); | |
1591 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { | |
1592 | mutex_lock(&n->vqs[i].vq.mutex); | |
1593 | n->vqs[i].vq.acked_backend_features = features; | |
1594 | mutex_unlock(&n->vqs[i].vq.mutex); | |
1595 | } | |
1596 | mutex_unlock(&n->dev.mutex); | |
1597 | ||
1598 | return 0; | |
1599 | } | |
1600 | ||
3a4d5c94 MT |
1601 | static int vhost_net_set_features(struct vhost_net *n, u64 features) |
1602 | { | |
8dd014ad | 1603 | size_t vhost_hlen, sock_hlen, hdr_len; |
3a4d5c94 | 1604 | int i; |
8dd014ad | 1605 | |
e4fca7d6 MT |
1606 | hdr_len = (features & ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | |
1607 | (1ULL << VIRTIO_F_VERSION_1))) ? | |
8dd014ad DS |
1608 | sizeof(struct virtio_net_hdr_mrg_rxbuf) : |
1609 | sizeof(struct virtio_net_hdr); | |
1610 | if (features & (1 << VHOST_NET_F_VIRTIO_NET_HDR)) { | |
1611 | /* vhost provides vnet_hdr */ | |
1612 | vhost_hlen = hdr_len; | |
1613 | sock_hlen = 0; | |
1614 | } else { | |
1615 | /* socket provides vnet_hdr */ | |
1616 | vhost_hlen = 0; | |
1617 | sock_hlen = hdr_len; | |
1618 | } | |
3a4d5c94 MT |
1619 | mutex_lock(&n->dev.mutex); |
1620 | if ((features & (1 << VHOST_F_LOG_ALL)) && | |
6b1e6cc7 JW |
1621 | !vhost_log_access_ok(&n->dev)) |
1622 | goto out_unlock; | |
1623 | ||
1624 | if ((features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) { | |
1625 | if (vhost_init_device_iotlb(&n->dev, true)) | |
1626 | goto out_unlock; | |
3a4d5c94 | 1627 | } |
6b1e6cc7 | 1628 | |
3a4d5c94 | 1629 | for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { |
3ab2e420 | 1630 | mutex_lock(&n->vqs[i].vq.mutex); |
ea16c514 | 1631 | n->vqs[i].vq.acked_features = features; |
81f95a55 MT |
1632 | n->vqs[i].vhost_hlen = vhost_hlen; |
1633 | n->vqs[i].sock_hlen = sock_hlen; | |
3ab2e420 | 1634 | mutex_unlock(&n->vqs[i].vq.mutex); |
3a4d5c94 | 1635 | } |
3a4d5c94 MT |
1636 | mutex_unlock(&n->dev.mutex); |
1637 | return 0; | |
6b1e6cc7 JW |
1638 | |
1639 | out_unlock: | |
1640 | mutex_unlock(&n->dev.mutex); | |
1641 | return -EFAULT; | |
3a4d5c94 MT |
1642 | } |
1643 | ||
b1ad8496 AH |
1644 | static long vhost_net_set_owner(struct vhost_net *n) |
1645 | { | |
1646 | int r; | |
1647 | ||
1648 | mutex_lock(&n->dev.mutex); | |
05c05351 MT |
1649 | if (vhost_dev_has_owner(&n->dev)) { |
1650 | r = -EBUSY; | |
1651 | goto out; | |
1652 | } | |
b1ad8496 AH |
1653 | r = vhost_net_set_ubuf_info(n); |
1654 | if (r) | |
1655 | goto out; | |
1656 | r = vhost_dev_set_owner(&n->dev); | |
1657 | if (r) | |
1658 | vhost_net_clear_ubuf_info(n); | |
1659 | vhost_net_flush(n); | |
1660 | out: | |
1661 | mutex_unlock(&n->dev.mutex); | |
1662 | return r; | |
1663 | } | |
1664 | ||
3a4d5c94 MT |
1665 | static long vhost_net_ioctl(struct file *f, unsigned int ioctl, |
1666 | unsigned long arg) | |
1667 | { | |
1668 | struct vhost_net *n = f->private_data; | |
1669 | void __user *argp = (void __user *)arg; | |
1670 | u64 __user *featurep = argp; | |
1671 | struct vhost_vring_file backend; | |
1672 | u64 features; | |
1673 | int r; | |
d47effe1 | 1674 | |
3a4d5c94 MT |
1675 | switch (ioctl) { |
1676 | case VHOST_NET_SET_BACKEND: | |
d3553a52 TY |
1677 | if (copy_from_user(&backend, argp, sizeof backend)) |
1678 | return -EFAULT; | |
3a4d5c94 MT |
1679 | return vhost_net_set_backend(n, backend.index, backend.fd); |
1680 | case VHOST_GET_FEATURES: | |
0dd05a3b | 1681 | features = VHOST_NET_FEATURES; |
d3553a52 TY |
1682 | if (copy_to_user(featurep, &features, sizeof features)) |
1683 | return -EFAULT; | |
1684 | return 0; | |
3a4d5c94 | 1685 | case VHOST_SET_FEATURES: |
d3553a52 TY |
1686 | if (copy_from_user(&features, featurep, sizeof features)) |
1687 | return -EFAULT; | |
0dd05a3b | 1688 | if (features & ~VHOST_NET_FEATURES) |
3a4d5c94 MT |
1689 | return -EOPNOTSUPP; |
1690 | return vhost_net_set_features(n, features); | |
429711ae JW |
1691 | case VHOST_GET_BACKEND_FEATURES: |
1692 | features = VHOST_NET_BACKEND_FEATURES; | |
1693 | if (copy_to_user(featurep, &features, sizeof(features))) | |
1694 | return -EFAULT; | |
1695 | return 0; | |
1696 | case VHOST_SET_BACKEND_FEATURES: | |
1697 | if (copy_from_user(&features, featurep, sizeof(features))) | |
1698 | return -EFAULT; | |
1699 | if (features & ~VHOST_NET_BACKEND_FEATURES) | |
1700 | return -EOPNOTSUPP; | |
1701 | return vhost_net_set_backend_features(n, features); | |
3a4d5c94 MT |
1702 | case VHOST_RESET_OWNER: |
1703 | return vhost_net_reset_owner(n); | |
b1ad8496 AH |
1704 | case VHOST_SET_OWNER: |
1705 | return vhost_net_set_owner(n); | |
3a4d5c94 MT |
1706 | default: |
1707 | mutex_lock(&n->dev.mutex); | |
935cdee7 MT |
1708 | r = vhost_dev_ioctl(&n->dev, ioctl, argp); |
1709 | if (r == -ENOIOCTLCMD) | |
1710 | r = vhost_vring_ioctl(&n->dev, ioctl, argp); | |
1711 | else | |
1712 | vhost_net_flush(n); | |
3a4d5c94 MT |
1713 | mutex_unlock(&n->dev.mutex); |
1714 | return r; | |
1715 | } | |
1716 | } | |
1717 | ||
1718 | #ifdef CONFIG_COMPAT | |
1719 | static long vhost_net_compat_ioctl(struct file *f, unsigned int ioctl, | |
1720 | unsigned long arg) | |
1721 | { | |
1722 | return vhost_net_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
1723 | } | |
1724 | #endif | |
1725 | ||
6b1e6cc7 JW |
1726 | static ssize_t vhost_net_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1727 | { | |
1728 | struct file *file = iocb->ki_filp; | |
1729 | struct vhost_net *n = file->private_data; | |
1730 | struct vhost_dev *dev = &n->dev; | |
1731 | int noblock = file->f_flags & O_NONBLOCK; | |
1732 | ||
1733 | return vhost_chr_read_iter(dev, to, noblock); | |
1734 | } | |
1735 | ||
1736 | static ssize_t vhost_net_chr_write_iter(struct kiocb *iocb, | |
1737 | struct iov_iter *from) | |
1738 | { | |
1739 | struct file *file = iocb->ki_filp; | |
1740 | struct vhost_net *n = file->private_data; | |
1741 | struct vhost_dev *dev = &n->dev; | |
1742 | ||
1743 | return vhost_chr_write_iter(dev, from); | |
1744 | } | |
1745 | ||
afc9a42b | 1746 | static __poll_t vhost_net_chr_poll(struct file *file, poll_table *wait) |
6b1e6cc7 JW |
1747 | { |
1748 | struct vhost_net *n = file->private_data; | |
1749 | struct vhost_dev *dev = &n->dev; | |
1750 | ||
1751 | return vhost_chr_poll(file, dev, wait); | |
1752 | } | |
1753 | ||
373a83a6 | 1754 | static const struct file_operations vhost_net_fops = { |
3a4d5c94 MT |
1755 | .owner = THIS_MODULE, |
1756 | .release = vhost_net_release, | |
6b1e6cc7 JW |
1757 | .read_iter = vhost_net_chr_read_iter, |
1758 | .write_iter = vhost_net_chr_write_iter, | |
1759 | .poll = vhost_net_chr_poll, | |
3a4d5c94 MT |
1760 | .unlocked_ioctl = vhost_net_ioctl, |
1761 | #ifdef CONFIG_COMPAT | |
1762 | .compat_ioctl = vhost_net_compat_ioctl, | |
1763 | #endif | |
1764 | .open = vhost_net_open, | |
6038f373 | 1765 | .llseek = noop_llseek, |
3a4d5c94 MT |
1766 | }; |
1767 | ||
1768 | static struct miscdevice vhost_net_misc = { | |
7c7c7f01 | 1769 | .minor = VHOST_NET_MINOR, |
1770 | .name = "vhost-net", | |
1771 | .fops = &vhost_net_fops, | |
3a4d5c94 MT |
1772 | }; |
1773 | ||
a8d3782f | 1774 | static int vhost_net_init(void) |
3a4d5c94 | 1775 | { |
bab632d6 | 1776 | if (experimental_zcopytx) |
fe729a57 | 1777 | vhost_net_enable_zcopy(VHOST_NET_VQ_TX); |
c23f3445 | 1778 | return misc_register(&vhost_net_misc); |
3a4d5c94 MT |
1779 | } |
1780 | module_init(vhost_net_init); | |
1781 | ||
a8d3782f | 1782 | static void vhost_net_exit(void) |
3a4d5c94 MT |
1783 | { |
1784 | misc_deregister(&vhost_net_misc); | |
3a4d5c94 MT |
1785 | } |
1786 | module_exit(vhost_net_exit); | |
1787 | ||
1788 | MODULE_VERSION("0.0.1"); | |
1789 | MODULE_LICENSE("GPL v2"); | |
1790 | MODULE_AUTHOR("Michael S. Tsirkin"); | |
1791 | MODULE_DESCRIPTION("Host kernel accelerator for virtio net"); | |
7c7c7f01 | 1792 | MODULE_ALIAS_MISCDEV(VHOST_NET_MINOR); |
1793 | MODULE_ALIAS("devname:vhost-net"); |