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[ceph.git] / ceph / src / spdk / dpdk / lib / librte_vhost / vhost_user.c
1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2018 Intel Corporation
3 */
4
5 /* Security model
6 * --------------
7 * The vhost-user protocol connection is an external interface, so it must be
8 * robust against invalid inputs.
9 *
10 * This is important because the vhost-user master is only one step removed
11 * from the guest. Malicious guests that have escaped will then launch further
12 * attacks from the vhost-user master.
13 *
14 * Even in deployments where guests are trusted, a bug in the vhost-user master
15 * can still cause invalid messages to be sent. Such messages must not
16 * compromise the stability of the DPDK application by causing crashes, memory
17 * corruption, or other problematic behavior.
18 *
19 * Do not assume received VhostUserMsg fields contain sensible values!
20 */
21
22 #include <stdint.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <unistd.h>
27 #include <fcntl.h>
28 #include <sys/ioctl.h>
29 #include <sys/mman.h>
30 #include <sys/types.h>
31 #include <sys/stat.h>
32 #include <sys/syscall.h>
33 #include <assert.h>
34 #ifdef RTE_LIBRTE_VHOST_NUMA
35 #include <numaif.h>
36 #endif
37 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
38 #include <linux/userfaultfd.h>
39 #endif
40
41 #include <rte_common.h>
42 #include <rte_malloc.h>
43 #include <rte_log.h>
44
45 #include "iotlb.h"
46 #include "vhost.h"
47 #include "vhost_user.h"
48
49 #define VIRTIO_MIN_MTU 68
50 #define VIRTIO_MAX_MTU 65535
51
52 static const char *vhost_message_str[VHOST_USER_MAX] = {
53 [VHOST_USER_NONE] = "VHOST_USER_NONE",
54 [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
55 [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
56 [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
57 [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
58 [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
59 [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
60 [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
61 [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
62 [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
63 [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
64 [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
65 [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
66 [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
67 [VHOST_USER_SET_VRING_ERR] = "VHOST_USER_SET_VRING_ERR",
68 [VHOST_USER_GET_PROTOCOL_FEATURES] = "VHOST_USER_GET_PROTOCOL_FEATURES",
69 [VHOST_USER_SET_PROTOCOL_FEATURES] = "VHOST_USER_SET_PROTOCOL_FEATURES",
70 [VHOST_USER_GET_QUEUE_NUM] = "VHOST_USER_GET_QUEUE_NUM",
71 [VHOST_USER_SET_VRING_ENABLE] = "VHOST_USER_SET_VRING_ENABLE",
72 [VHOST_USER_SEND_RARP] = "VHOST_USER_SEND_RARP",
73 [VHOST_USER_NET_SET_MTU] = "VHOST_USER_NET_SET_MTU",
74 [VHOST_USER_SET_SLAVE_REQ_FD] = "VHOST_USER_SET_SLAVE_REQ_FD",
75 [VHOST_USER_IOTLB_MSG] = "VHOST_USER_IOTLB_MSG",
76 [VHOST_USER_CRYPTO_CREATE_SESS] = "VHOST_USER_CRYPTO_CREATE_SESS",
77 [VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
78 [VHOST_USER_POSTCOPY_ADVISE] = "VHOST_USER_POSTCOPY_ADVISE",
79 [VHOST_USER_POSTCOPY_LISTEN] = "VHOST_USER_POSTCOPY_LISTEN",
80 [VHOST_USER_POSTCOPY_END] = "VHOST_USER_POSTCOPY_END",
81 };
82
83 static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg);
84 static int read_vhost_message(int sockfd, struct VhostUserMsg *msg);
85
86 static uint64_t
87 get_blk_size(int fd)
88 {
89 struct stat stat;
90 int ret;
91
92 ret = fstat(fd, &stat);
93 return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
94 }
95
96 /*
97 * Reclaim all the outstanding zmbufs for a virtqueue.
98 */
99 static void
100 drain_zmbuf_list(struct vhost_virtqueue *vq)
101 {
102 struct zcopy_mbuf *zmbuf, *next;
103
104 for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
105 zmbuf != NULL; zmbuf = next) {
106 next = TAILQ_NEXT(zmbuf, next);
107
108 while (!mbuf_is_consumed(zmbuf->mbuf))
109 usleep(1000);
110
111 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
112 restore_mbuf(zmbuf->mbuf);
113 rte_pktmbuf_free(zmbuf->mbuf);
114 put_zmbuf(zmbuf);
115 vq->nr_zmbuf -= 1;
116 }
117 }
118
119 static void
120 free_mem_region(struct virtio_net *dev)
121 {
122 uint32_t i;
123 struct rte_vhost_mem_region *reg;
124 struct vhost_virtqueue *vq;
125
126 if (!dev || !dev->mem)
127 return;
128
129 if (dev->dequeue_zero_copy) {
130 for (i = 0; i < dev->nr_vring; i++) {
131 vq = dev->virtqueue[i];
132 if (vq)
133 drain_zmbuf_list(vq);
134 }
135 }
136
137 for (i = 0; i < dev->mem->nregions; i++) {
138 reg = &dev->mem->regions[i];
139 if (reg->host_user_addr) {
140 munmap(reg->mmap_addr, reg->mmap_size);
141 close(reg->fd);
142 }
143 }
144 }
145
146 void
147 vhost_backend_cleanup(struct virtio_net *dev)
148 {
149 if (dev->mem) {
150 free_mem_region(dev);
151 rte_free(dev->mem);
152 dev->mem = NULL;
153 }
154
155 free(dev->guest_pages);
156 dev->guest_pages = NULL;
157
158 if (dev->log_addr) {
159 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
160 dev->log_addr = 0;
161 }
162
163 if (dev->slave_req_fd >= 0) {
164 close(dev->slave_req_fd);
165 dev->slave_req_fd = -1;
166 }
167
168 if (dev->postcopy_ufd >= 0) {
169 close(dev->postcopy_ufd);
170 dev->postcopy_ufd = -1;
171 }
172
173 dev->postcopy_listening = 0;
174 }
175
176 /*
177 * This function just returns success at the moment unless
178 * the device hasn't been initialised.
179 */
180 static int
181 vhost_user_set_owner(struct virtio_net **pdev __rte_unused,
182 struct VhostUserMsg *msg __rte_unused,
183 int main_fd __rte_unused)
184 {
185 return RTE_VHOST_MSG_RESULT_OK;
186 }
187
188 static int
189 vhost_user_reset_owner(struct virtio_net **pdev,
190 struct VhostUserMsg *msg __rte_unused,
191 int main_fd __rte_unused)
192 {
193 struct virtio_net *dev = *pdev;
194 vhost_destroy_device_notify(dev);
195
196 cleanup_device(dev, 0);
197 reset_device(dev);
198 return RTE_VHOST_MSG_RESULT_OK;
199 }
200
201 /*
202 * The features that we support are requested.
203 */
204 static int
205 vhost_user_get_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
206 int main_fd __rte_unused)
207 {
208 struct virtio_net *dev = *pdev;
209 uint64_t features = 0;
210
211 rte_vhost_driver_get_features(dev->ifname, &features);
212
213 msg->payload.u64 = features;
214 msg->size = sizeof(msg->payload.u64);
215 msg->fd_num = 0;
216
217 return RTE_VHOST_MSG_RESULT_REPLY;
218 }
219
220 /*
221 * The queue number that we support are requested.
222 */
223 static int
224 vhost_user_get_queue_num(struct virtio_net **pdev, struct VhostUserMsg *msg,
225 int main_fd __rte_unused)
226 {
227 struct virtio_net *dev = *pdev;
228 uint32_t queue_num = 0;
229
230 rte_vhost_driver_get_queue_num(dev->ifname, &queue_num);
231
232 msg->payload.u64 = (uint64_t)queue_num;
233 msg->size = sizeof(msg->payload.u64);
234 msg->fd_num = 0;
235
236 return RTE_VHOST_MSG_RESULT_REPLY;
237 }
238
239 /*
240 * We receive the negotiated features supported by us and the virtio device.
241 */
242 static int
243 vhost_user_set_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
244 int main_fd __rte_unused)
245 {
246 struct virtio_net *dev = *pdev;
247 uint64_t features = msg->payload.u64;
248 uint64_t vhost_features = 0;
249 struct rte_vdpa_device *vdpa_dev;
250 int did = -1;
251
252 rte_vhost_driver_get_features(dev->ifname, &vhost_features);
253 if (features & ~vhost_features) {
254 RTE_LOG(ERR, VHOST_CONFIG,
255 "(%d) received invalid negotiated features.\n",
256 dev->vid);
257 return RTE_VHOST_MSG_RESULT_ERR;
258 }
259
260 if (dev->flags & VIRTIO_DEV_RUNNING) {
261 if (dev->features == features)
262 return RTE_VHOST_MSG_RESULT_OK;
263
264 /*
265 * Error out if master tries to change features while device is
266 * in running state. The exception being VHOST_F_LOG_ALL, which
267 * is enabled when the live-migration starts.
268 */
269 if ((dev->features ^ features) & ~(1ULL << VHOST_F_LOG_ALL)) {
270 RTE_LOG(ERR, VHOST_CONFIG,
271 "(%d) features changed while device is running.\n",
272 dev->vid);
273 return RTE_VHOST_MSG_RESULT_ERR;
274 }
275
276 if (dev->notify_ops->features_changed)
277 dev->notify_ops->features_changed(dev->vid, features);
278 }
279
280 dev->features = features;
281 if (dev->features &
282 ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
283 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
284 } else {
285 dev->vhost_hlen = sizeof(struct virtio_net_hdr);
286 }
287 VHOST_LOG_DEBUG(VHOST_CONFIG,
288 "(%d) mergeable RX buffers %s, virtio 1 %s\n",
289 dev->vid,
290 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
291 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
292
293 if ((dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) &&
294 !(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
295 /*
296 * Remove all but first queue pair if MQ hasn't been
297 * negotiated. This is safe because the device is not
298 * running at this stage.
299 */
300 while (dev->nr_vring > 2) {
301 struct vhost_virtqueue *vq;
302
303 vq = dev->virtqueue[--dev->nr_vring];
304 if (!vq)
305 continue;
306
307 dev->virtqueue[dev->nr_vring] = NULL;
308 cleanup_vq(vq, 1);
309 free_vq(dev, vq);
310 }
311 }
312
313 did = dev->vdpa_dev_id;
314 vdpa_dev = rte_vdpa_get_device(did);
315 if (vdpa_dev && vdpa_dev->ops->set_features)
316 vdpa_dev->ops->set_features(dev->vid);
317
318 return RTE_VHOST_MSG_RESULT_OK;
319 }
320
321 /*
322 * The virtio device sends us the size of the descriptor ring.
323 */
324 static int
325 vhost_user_set_vring_num(struct virtio_net **pdev,
326 struct VhostUserMsg *msg,
327 int main_fd __rte_unused)
328 {
329 struct virtio_net *dev = *pdev;
330 struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
331
332 vq->size = msg->payload.state.num;
333
334 /* VIRTIO 1.0, 2.4 Virtqueues says:
335 *
336 * Queue Size value is always a power of 2. The maximum Queue Size
337 * value is 32768.
338 */
339 if ((vq->size & (vq->size - 1)) || vq->size > 32768) {
340 RTE_LOG(ERR, VHOST_CONFIG,
341 "invalid virtqueue size %u\n", vq->size);
342 return RTE_VHOST_MSG_RESULT_ERR;
343 }
344
345 if (dev->dequeue_zero_copy) {
346 vq->nr_zmbuf = 0;
347 vq->last_zmbuf_idx = 0;
348 vq->zmbuf_size = vq->size;
349 vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
350 sizeof(struct zcopy_mbuf), 0);
351 if (vq->zmbufs == NULL) {
352 RTE_LOG(WARNING, VHOST_CONFIG,
353 "failed to allocate mem for zero copy; "
354 "zero copy is force disabled\n");
355 dev->dequeue_zero_copy = 0;
356 }
357 TAILQ_INIT(&vq->zmbuf_list);
358 }
359
360 if (vq_is_packed(dev)) {
361 vq->shadow_used_packed = rte_malloc(NULL,
362 vq->size *
363 sizeof(struct vring_used_elem_packed),
364 RTE_CACHE_LINE_SIZE);
365 if (!vq->shadow_used_packed) {
366 RTE_LOG(ERR, VHOST_CONFIG,
367 "failed to allocate memory for shadow used ring.\n");
368 return RTE_VHOST_MSG_RESULT_ERR;
369 }
370
371 } else {
372 vq->shadow_used_split = rte_malloc(NULL,
373 vq->size * sizeof(struct vring_used_elem),
374 RTE_CACHE_LINE_SIZE);
375 if (!vq->shadow_used_split) {
376 RTE_LOG(ERR, VHOST_CONFIG,
377 "failed to allocate memory for shadow used ring.\n");
378 return RTE_VHOST_MSG_RESULT_ERR;
379 }
380 }
381
382 vq->batch_copy_elems = rte_malloc(NULL,
383 vq->size * sizeof(struct batch_copy_elem),
384 RTE_CACHE_LINE_SIZE);
385 if (!vq->batch_copy_elems) {
386 RTE_LOG(ERR, VHOST_CONFIG,
387 "failed to allocate memory for batching copy.\n");
388 return RTE_VHOST_MSG_RESULT_ERR;
389 }
390
391 return RTE_VHOST_MSG_RESULT_OK;
392 }
393
394 /*
395 * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
396 * same numa node as the memory of vring descriptor.
397 */
398 #ifdef RTE_LIBRTE_VHOST_NUMA
399 static struct virtio_net*
400 numa_realloc(struct virtio_net *dev, int index)
401 {
402 int oldnode, newnode;
403 struct virtio_net *old_dev;
404 struct vhost_virtqueue *old_vq, *vq;
405 struct zcopy_mbuf *new_zmbuf;
406 struct vring_used_elem *new_shadow_used_split;
407 struct vring_used_elem_packed *new_shadow_used_packed;
408 struct batch_copy_elem *new_batch_copy_elems;
409 int ret;
410
411 old_dev = dev;
412 vq = old_vq = dev->virtqueue[index];
413
414 ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
415 MPOL_F_NODE | MPOL_F_ADDR);
416
417 /* check if we need to reallocate vq */
418 ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
419 MPOL_F_NODE | MPOL_F_ADDR);
420 if (ret) {
421 RTE_LOG(ERR, VHOST_CONFIG,
422 "Unable to get vq numa information.\n");
423 return dev;
424 }
425 if (oldnode != newnode) {
426 RTE_LOG(INFO, VHOST_CONFIG,
427 "reallocate vq from %d to %d node\n", oldnode, newnode);
428 vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode);
429 if (!vq)
430 return dev;
431
432 memcpy(vq, old_vq, sizeof(*vq));
433 TAILQ_INIT(&vq->zmbuf_list);
434
435 if (dev->dequeue_zero_copy) {
436 new_zmbuf = rte_malloc_socket(NULL, vq->zmbuf_size *
437 sizeof(struct zcopy_mbuf), 0, newnode);
438 if (new_zmbuf) {
439 rte_free(vq->zmbufs);
440 vq->zmbufs = new_zmbuf;
441 }
442 }
443
444 if (vq_is_packed(dev)) {
445 new_shadow_used_packed = rte_malloc_socket(NULL,
446 vq->size *
447 sizeof(struct vring_used_elem_packed),
448 RTE_CACHE_LINE_SIZE,
449 newnode);
450 if (new_shadow_used_packed) {
451 rte_free(vq->shadow_used_packed);
452 vq->shadow_used_packed = new_shadow_used_packed;
453 }
454 } else {
455 new_shadow_used_split = rte_malloc_socket(NULL,
456 vq->size *
457 sizeof(struct vring_used_elem),
458 RTE_CACHE_LINE_SIZE,
459 newnode);
460 if (new_shadow_used_split) {
461 rte_free(vq->shadow_used_split);
462 vq->shadow_used_split = new_shadow_used_split;
463 }
464 }
465
466 new_batch_copy_elems = rte_malloc_socket(NULL,
467 vq->size * sizeof(struct batch_copy_elem),
468 RTE_CACHE_LINE_SIZE,
469 newnode);
470 if (new_batch_copy_elems) {
471 rte_free(vq->batch_copy_elems);
472 vq->batch_copy_elems = new_batch_copy_elems;
473 }
474
475 rte_free(old_vq);
476 }
477
478 /* check if we need to reallocate dev */
479 ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
480 MPOL_F_NODE | MPOL_F_ADDR);
481 if (ret) {
482 RTE_LOG(ERR, VHOST_CONFIG,
483 "Unable to get dev numa information.\n");
484 goto out;
485 }
486 if (oldnode != newnode) {
487 RTE_LOG(INFO, VHOST_CONFIG,
488 "reallocate dev from %d to %d node\n",
489 oldnode, newnode);
490 dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
491 if (!dev) {
492 dev = old_dev;
493 goto out;
494 }
495
496 memcpy(dev, old_dev, sizeof(*dev));
497 rte_free(old_dev);
498 }
499
500 out:
501 dev->virtqueue[index] = vq;
502 vhost_devices[dev->vid] = dev;
503
504 if (old_vq != vq)
505 vhost_user_iotlb_init(dev, index);
506
507 return dev;
508 }
509 #else
510 static struct virtio_net*
511 numa_realloc(struct virtio_net *dev, int index __rte_unused)
512 {
513 return dev;
514 }
515 #endif
516
517 /* Converts QEMU virtual address to Vhost virtual address. */
518 static uint64_t
519 qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len)
520 {
521 struct rte_vhost_mem_region *r;
522 uint32_t i;
523
524 if (unlikely(!dev || !dev->mem))
525 goto out_error;
526
527 /* Find the region where the address lives. */
528 for (i = 0; i < dev->mem->nregions; i++) {
529 r = &dev->mem->regions[i];
530
531 if (qva >= r->guest_user_addr &&
532 qva < r->guest_user_addr + r->size) {
533
534 if (unlikely(*len > r->guest_user_addr + r->size - qva))
535 *len = r->guest_user_addr + r->size - qva;
536
537 return qva - r->guest_user_addr +
538 r->host_user_addr;
539 }
540 }
541 out_error:
542 *len = 0;
543
544 return 0;
545 }
546
547
548 /*
549 * Converts ring address to Vhost virtual address.
550 * If IOMMU is enabled, the ring address is a guest IO virtual address,
551 * else it is a QEMU virtual address.
552 */
553 static uint64_t
554 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
555 uint64_t ra, uint64_t *size)
556 {
557 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
558 uint64_t vva;
559
560 vva = vhost_user_iotlb_cache_find(vq, ra,
561 size, VHOST_ACCESS_RW);
562 if (!vva)
563 vhost_user_iotlb_miss(dev, ra, VHOST_ACCESS_RW);
564
565 return vva;
566 }
567
568 return qva_to_vva(dev, ra, size);
569 }
570
571 static struct virtio_net *
572 translate_ring_addresses(struct virtio_net *dev, int vq_index)
573 {
574 struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
575 struct vhost_vring_addr *addr = &vq->ring_addrs;
576 uint64_t len, expected_len;
577
578 if (vq_is_packed(dev)) {
579 len = sizeof(struct vring_packed_desc) * vq->size;
580 vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
581 ring_addr_to_vva(dev, vq, addr->desc_user_addr, &len);
582 vq->log_guest_addr = 0;
583 if (vq->desc_packed == NULL ||
584 len != sizeof(struct vring_packed_desc) *
585 vq->size) {
586 RTE_LOG(DEBUG, VHOST_CONFIG,
587 "(%d) failed to map desc_packed ring.\n",
588 dev->vid);
589 return dev;
590 }
591
592 dev = numa_realloc(dev, vq_index);
593 vq = dev->virtqueue[vq_index];
594 addr = &vq->ring_addrs;
595
596 len = sizeof(struct vring_packed_desc_event);
597 vq->driver_event = (struct vring_packed_desc_event *)
598 (uintptr_t)ring_addr_to_vva(dev,
599 vq, addr->avail_user_addr, &len);
600 if (vq->driver_event == NULL ||
601 len != sizeof(struct vring_packed_desc_event)) {
602 RTE_LOG(DEBUG, VHOST_CONFIG,
603 "(%d) failed to find driver area address.\n",
604 dev->vid);
605 return dev;
606 }
607
608 len = sizeof(struct vring_packed_desc_event);
609 vq->device_event = (struct vring_packed_desc_event *)
610 (uintptr_t)ring_addr_to_vva(dev,
611 vq, addr->used_user_addr, &len);
612 if (vq->device_event == NULL ||
613 len != sizeof(struct vring_packed_desc_event)) {
614 RTE_LOG(DEBUG, VHOST_CONFIG,
615 "(%d) failed to find device area address.\n",
616 dev->vid);
617 return dev;
618 }
619
620 return dev;
621 }
622
623 /* The addresses are converted from QEMU virtual to Vhost virtual. */
624 if (vq->desc && vq->avail && vq->used)
625 return dev;
626
627 len = sizeof(struct vring_desc) * vq->size;
628 vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev,
629 vq, addr->desc_user_addr, &len);
630 if (vq->desc == 0 || len != sizeof(struct vring_desc) * vq->size) {
631 RTE_LOG(DEBUG, VHOST_CONFIG,
632 "(%d) failed to map desc ring.\n",
633 dev->vid);
634 return dev;
635 }
636
637 dev = numa_realloc(dev, vq_index);
638 vq = dev->virtqueue[vq_index];
639 addr = &vq->ring_addrs;
640
641 len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
642 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
643 len += sizeof(uint16_t);
644 expected_len = len;
645 vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev,
646 vq, addr->avail_user_addr, &len);
647 if (vq->avail == 0 || len != expected_len) {
648 RTE_LOG(DEBUG, VHOST_CONFIG,
649 "(%d) failed to map avail ring.\n",
650 dev->vid);
651 return dev;
652 }
653
654 len = sizeof(struct vring_used) +
655 sizeof(struct vring_used_elem) * vq->size;
656 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
657 len += sizeof(uint16_t);
658 expected_len = len;
659 vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev,
660 vq, addr->used_user_addr, &len);
661 if (vq->used == 0 || len != expected_len) {
662 RTE_LOG(DEBUG, VHOST_CONFIG,
663 "(%d) failed to map used ring.\n",
664 dev->vid);
665 return dev;
666 }
667
668 if (vq->last_used_idx != vq->used->idx) {
669 RTE_LOG(WARNING, VHOST_CONFIG,
670 "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
671 "some packets maybe resent for Tx and dropped for Rx\n",
672 vq->last_used_idx, vq->used->idx);
673 vq->last_used_idx = vq->used->idx;
674 vq->last_avail_idx = vq->used->idx;
675 }
676
677 vq->log_guest_addr = addr->log_guest_addr;
678
679 VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address desc: %p\n",
680 dev->vid, vq->desc);
681 VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address avail: %p\n",
682 dev->vid, vq->avail);
683 VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) mapped address used: %p\n",
684 dev->vid, vq->used);
685 VHOST_LOG_DEBUG(VHOST_CONFIG, "(%d) log_guest_addr: %" PRIx64 "\n",
686 dev->vid, vq->log_guest_addr);
687
688 return dev;
689 }
690
691 /*
692 * The virtio device sends us the desc, used and avail ring addresses.
693 * This function then converts these to our address space.
694 */
695 static int
696 vhost_user_set_vring_addr(struct virtio_net **pdev, struct VhostUserMsg *msg,
697 int main_fd __rte_unused)
698 {
699 struct virtio_net *dev = *pdev;
700 struct vhost_virtqueue *vq;
701 struct vhost_vring_addr *addr = &msg->payload.addr;
702
703 if (dev->mem == NULL)
704 return RTE_VHOST_MSG_RESULT_ERR;
705
706 /* addr->index refers to the queue index. The txq 1, rxq is 0. */
707 vq = dev->virtqueue[msg->payload.addr.index];
708
709 /*
710 * Rings addresses should not be interpreted as long as the ring is not
711 * started and enabled
712 */
713 memcpy(&vq->ring_addrs, addr, sizeof(*addr));
714
715 vring_invalidate(dev, vq);
716
717 if (vq->enabled && (dev->features &
718 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
719 dev = translate_ring_addresses(dev, msg->payload.addr.index);
720 if (!dev)
721 return RTE_VHOST_MSG_RESULT_ERR;
722
723 *pdev = dev;
724 }
725
726 return RTE_VHOST_MSG_RESULT_OK;
727 }
728
729 /*
730 * The virtio device sends us the available ring last used index.
731 */
732 static int
733 vhost_user_set_vring_base(struct virtio_net **pdev,
734 struct VhostUserMsg *msg,
735 int main_fd __rte_unused)
736 {
737 struct virtio_net *dev = *pdev;
738 struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
739 uint64_t val = msg->payload.state.num;
740
741 if (vq_is_packed(dev)) {
742 /*
743 * Bit[0:14]: avail index
744 * Bit[15]: avail wrap counter
745 */
746 vq->last_avail_idx = val & 0x7fff;
747 vq->avail_wrap_counter = !!(val & (0x1 << 15));
748 /*
749 * Set used index to same value as available one, as
750 * their values should be the same since ring processing
751 * was stopped at get time.
752 */
753 vq->last_used_idx = vq->last_avail_idx;
754 vq->used_wrap_counter = vq->avail_wrap_counter;
755 } else {
756 vq->last_used_idx = msg->payload.state.num;
757 vq->last_avail_idx = msg->payload.state.num;
758 }
759
760 return RTE_VHOST_MSG_RESULT_OK;
761 }
762
763 static int
764 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
765 uint64_t host_phys_addr, uint64_t size)
766 {
767 struct guest_page *page, *last_page;
768 struct guest_page *old_pages;
769
770 if (dev->nr_guest_pages == dev->max_guest_pages) {
771 dev->max_guest_pages *= 2;
772 old_pages = dev->guest_pages;
773 dev->guest_pages = realloc(dev->guest_pages,
774 dev->max_guest_pages * sizeof(*page));
775 if (!dev->guest_pages) {
776 RTE_LOG(ERR, VHOST_CONFIG, "cannot realloc guest_pages\n");
777 free(old_pages);
778 return -1;
779 }
780 }
781
782 if (dev->nr_guest_pages > 0) {
783 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
784 /* merge if the two pages are continuous */
785 if (host_phys_addr == last_page->host_phys_addr +
786 last_page->size) {
787 last_page->size += size;
788 return 0;
789 }
790 }
791
792 page = &dev->guest_pages[dev->nr_guest_pages++];
793 page->guest_phys_addr = guest_phys_addr;
794 page->host_phys_addr = host_phys_addr;
795 page->size = size;
796
797 return 0;
798 }
799
800 static int
801 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
802 uint64_t page_size)
803 {
804 uint64_t reg_size = reg->size;
805 uint64_t host_user_addr = reg->host_user_addr;
806 uint64_t guest_phys_addr = reg->guest_phys_addr;
807 uint64_t host_phys_addr;
808 uint64_t size;
809
810 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr);
811 size = page_size - (guest_phys_addr & (page_size - 1));
812 size = RTE_MIN(size, reg_size);
813
814 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size) < 0)
815 return -1;
816
817 host_user_addr += size;
818 guest_phys_addr += size;
819 reg_size -= size;
820
821 while (reg_size > 0) {
822 size = RTE_MIN(reg_size, page_size);
823 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)
824 host_user_addr);
825 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr,
826 size) < 0)
827 return -1;
828
829 host_user_addr += size;
830 guest_phys_addr += size;
831 reg_size -= size;
832 }
833
834 return 0;
835 }
836
837 #ifdef RTE_LIBRTE_VHOST_DEBUG
838 /* TODO: enable it only in debug mode? */
839 static void
840 dump_guest_pages(struct virtio_net *dev)
841 {
842 uint32_t i;
843 struct guest_page *page;
844
845 for (i = 0; i < dev->nr_guest_pages; i++) {
846 page = &dev->guest_pages[i];
847
848 RTE_LOG(INFO, VHOST_CONFIG,
849 "guest physical page region %u\n"
850 "\t guest_phys_addr: %" PRIx64 "\n"
851 "\t host_phys_addr : %" PRIx64 "\n"
852 "\t size : %" PRIx64 "\n",
853 i,
854 page->guest_phys_addr,
855 page->host_phys_addr,
856 page->size);
857 }
858 }
859 #else
860 #define dump_guest_pages(dev)
861 #endif
862
863 static bool
864 vhost_memory_changed(struct VhostUserMemory *new,
865 struct rte_vhost_memory *old)
866 {
867 uint32_t i;
868
869 if (new->nregions != old->nregions)
870 return true;
871
872 for (i = 0; i < new->nregions; ++i) {
873 VhostUserMemoryRegion *new_r = &new->regions[i];
874 struct rte_vhost_mem_region *old_r = &old->regions[i];
875
876 if (new_r->guest_phys_addr != old_r->guest_phys_addr)
877 return true;
878 if (new_r->memory_size != old_r->size)
879 return true;
880 if (new_r->userspace_addr != old_r->guest_user_addr)
881 return true;
882 }
883
884 return false;
885 }
886
887 static int
888 vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
889 int main_fd)
890 {
891 struct virtio_net *dev = *pdev;
892 struct VhostUserMemory *memory = &msg->payload.memory;
893 struct rte_vhost_mem_region *reg;
894 void *mmap_addr;
895 uint64_t mmap_size;
896 uint64_t mmap_offset;
897 uint64_t alignment;
898 uint32_t i;
899 int populate;
900 int fd;
901
902 if (memory->nregions > VHOST_MEMORY_MAX_NREGIONS) {
903 RTE_LOG(ERR, VHOST_CONFIG,
904 "too many memory regions (%u)\n", memory->nregions);
905 return RTE_VHOST_MSG_RESULT_ERR;
906 }
907
908 if (dev->mem && !vhost_memory_changed(memory, dev->mem)) {
909 RTE_LOG(INFO, VHOST_CONFIG,
910 "(%d) memory regions not changed\n", dev->vid);
911
912 for (i = 0; i < memory->nregions; i++)
913 close(msg->fds[i]);
914
915 return RTE_VHOST_MSG_RESULT_OK;
916 }
917
918 if (dev->mem) {
919 free_mem_region(dev);
920 rte_free(dev->mem);
921 dev->mem = NULL;
922 }
923
924 /* Flush IOTLB cache as previous HVAs are now invalid */
925 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
926 for (i = 0; i < dev->nr_vring; i++)
927 vhost_user_iotlb_flush_all(dev->virtqueue[i]);
928
929 dev->nr_guest_pages = 0;
930 if (!dev->guest_pages) {
931 dev->max_guest_pages = 8;
932 dev->guest_pages = malloc(dev->max_guest_pages *
933 sizeof(struct guest_page));
934 if (dev->guest_pages == NULL) {
935 RTE_LOG(ERR, VHOST_CONFIG,
936 "(%d) failed to allocate memory "
937 "for dev->guest_pages\n",
938 dev->vid);
939 return RTE_VHOST_MSG_RESULT_ERR;
940 }
941 }
942
943 dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) +
944 sizeof(struct rte_vhost_mem_region) * memory->nregions, 0);
945 if (dev->mem == NULL) {
946 RTE_LOG(ERR, VHOST_CONFIG,
947 "(%d) failed to allocate memory for dev->mem\n",
948 dev->vid);
949 return RTE_VHOST_MSG_RESULT_ERR;
950 }
951 dev->mem->nregions = memory->nregions;
952
953 for (i = 0; i < memory->nregions; i++) {
954 fd = msg->fds[i];
955 reg = &dev->mem->regions[i];
956
957 reg->guest_phys_addr = memory->regions[i].guest_phys_addr;
958 reg->guest_user_addr = memory->regions[i].userspace_addr;
959 reg->size = memory->regions[i].memory_size;
960 reg->fd = fd;
961
962 mmap_offset = memory->regions[i].mmap_offset;
963
964 /* Check for memory_size + mmap_offset overflow */
965 if (mmap_offset >= -reg->size) {
966 RTE_LOG(ERR, VHOST_CONFIG,
967 "mmap_offset (%#"PRIx64") and memory_size "
968 "(%#"PRIx64") overflow\n",
969 mmap_offset, reg->size);
970 goto err_mmap;
971 }
972
973 mmap_size = reg->size + mmap_offset;
974
975 /* mmap() without flag of MAP_ANONYMOUS, should be called
976 * with length argument aligned with hugepagesz at older
977 * longterm version Linux, like 2.6.32 and 3.2.72, or
978 * mmap() will fail with EINVAL.
979 *
980 * to avoid failure, make sure in caller to keep length
981 * aligned.
982 */
983 alignment = get_blk_size(fd);
984 if (alignment == (uint64_t)-1) {
985 RTE_LOG(ERR, VHOST_CONFIG,
986 "couldn't get hugepage size through fstat\n");
987 goto err_mmap;
988 }
989 mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
990
991 populate = (dev->dequeue_zero_copy) ? MAP_POPULATE : 0;
992 mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
993 MAP_SHARED | populate, fd, 0);
994
995 if (mmap_addr == MAP_FAILED) {
996 RTE_LOG(ERR, VHOST_CONFIG,
997 "mmap region %u failed.\n", i);
998 goto err_mmap;
999 }
1000
1001 reg->mmap_addr = mmap_addr;
1002 reg->mmap_size = mmap_size;
1003 reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
1004 mmap_offset;
1005
1006 if (dev->dequeue_zero_copy)
1007 if (add_guest_pages(dev, reg, alignment) < 0) {
1008 RTE_LOG(ERR, VHOST_CONFIG,
1009 "adding guest pages to region %u failed.\n",
1010 i);
1011 goto err_mmap;
1012 }
1013
1014 RTE_LOG(INFO, VHOST_CONFIG,
1015 "guest memory region %u, size: 0x%" PRIx64 "\n"
1016 "\t guest physical addr: 0x%" PRIx64 "\n"
1017 "\t guest virtual addr: 0x%" PRIx64 "\n"
1018 "\t host virtual addr: 0x%" PRIx64 "\n"
1019 "\t mmap addr : 0x%" PRIx64 "\n"
1020 "\t mmap size : 0x%" PRIx64 "\n"
1021 "\t mmap align: 0x%" PRIx64 "\n"
1022 "\t mmap off : 0x%" PRIx64 "\n",
1023 i, reg->size,
1024 reg->guest_phys_addr,
1025 reg->guest_user_addr,
1026 reg->host_user_addr,
1027 (uint64_t)(uintptr_t)mmap_addr,
1028 mmap_size,
1029 alignment,
1030 mmap_offset);
1031
1032 if (dev->postcopy_listening) {
1033 /*
1034 * We haven't a better way right now than sharing
1035 * DPDK's virtual address with Qemu, so that Qemu can
1036 * retrieve the region offset when handling userfaults.
1037 */
1038 memory->regions[i].userspace_addr =
1039 reg->host_user_addr;
1040 }
1041 }
1042 if (dev->postcopy_listening) {
1043 /* Send the addresses back to qemu */
1044 msg->fd_num = 0;
1045 send_vhost_reply(main_fd, msg);
1046
1047 /* Wait for qemu to acknolwedge it's got the addresses
1048 * we've got to wait before we're allowed to generate faults.
1049 */
1050 VhostUserMsg ack_msg;
1051 if (read_vhost_message(main_fd, &ack_msg) <= 0) {
1052 RTE_LOG(ERR, VHOST_CONFIG,
1053 "Failed to read qemu ack on postcopy set-mem-table\n");
1054 goto err_mmap;
1055 }
1056 if (ack_msg.request.master != VHOST_USER_SET_MEM_TABLE) {
1057 RTE_LOG(ERR, VHOST_CONFIG,
1058 "Bad qemu ack on postcopy set-mem-table (%d)\n",
1059 ack_msg.request.master);
1060 goto err_mmap;
1061 }
1062
1063 /* Now userfault register and we can use the memory */
1064 for (i = 0; i < memory->nregions; i++) {
1065 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
1066 reg = &dev->mem->regions[i];
1067 struct uffdio_register reg_struct;
1068
1069 /*
1070 * Let's register all the mmap'ed area to ensure
1071 * alignment on page boundary.
1072 */
1073 reg_struct.range.start =
1074 (uint64_t)(uintptr_t)reg->mmap_addr;
1075 reg_struct.range.len = reg->mmap_size;
1076 reg_struct.mode = UFFDIO_REGISTER_MODE_MISSING;
1077
1078 if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER,
1079 &reg_struct)) {
1080 RTE_LOG(ERR, VHOST_CONFIG,
1081 "Failed to register ufd for region %d: (ufd = %d) %s\n",
1082 i, dev->postcopy_ufd,
1083 strerror(errno));
1084 goto err_mmap;
1085 }
1086 RTE_LOG(INFO, VHOST_CONFIG,
1087 "\t userfaultfd registered for range : %llx - %llx\n",
1088 reg_struct.range.start,
1089 reg_struct.range.start +
1090 reg_struct.range.len - 1);
1091 #else
1092 goto err_mmap;
1093 #endif
1094 }
1095 }
1096
1097 for (i = 0; i < dev->nr_vring; i++) {
1098 struct vhost_virtqueue *vq = dev->virtqueue[i];
1099
1100 if (vq->desc || vq->avail || vq->used) {
1101 /*
1102 * If the memory table got updated, the ring addresses
1103 * need to be translated again as virtual addresses have
1104 * changed.
1105 */
1106 vring_invalidate(dev, vq);
1107
1108 dev = translate_ring_addresses(dev, i);
1109 if (!dev) {
1110 dev = *pdev;
1111 goto err_mmap;
1112 }
1113
1114 *pdev = dev;
1115 }
1116 }
1117
1118 dump_guest_pages(dev);
1119
1120 return RTE_VHOST_MSG_RESULT_OK;
1121
1122 err_mmap:
1123 free_mem_region(dev);
1124 rte_free(dev->mem);
1125 dev->mem = NULL;
1126 return RTE_VHOST_MSG_RESULT_ERR;
1127 }
1128
1129 static bool
1130 vq_is_ready(struct virtio_net *dev, struct vhost_virtqueue *vq)
1131 {
1132 bool rings_ok;
1133
1134 if (!vq)
1135 return false;
1136
1137 if (vq_is_packed(dev))
1138 rings_ok = !!vq->desc_packed;
1139 else
1140 rings_ok = vq->desc && vq->avail && vq->used;
1141
1142 return rings_ok &&
1143 vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1144 vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD;
1145 }
1146
1147 static int
1148 virtio_is_ready(struct virtio_net *dev)
1149 {
1150 struct vhost_virtqueue *vq;
1151 uint32_t i;
1152
1153 if (dev->nr_vring == 0)
1154 return 0;
1155
1156 for (i = 0; i < dev->nr_vring; i++) {
1157 vq = dev->virtqueue[i];
1158
1159 if (!vq_is_ready(dev, vq))
1160 return 0;
1161 }
1162
1163 RTE_LOG(INFO, VHOST_CONFIG,
1164 "virtio is now ready for processing.\n");
1165 return 1;
1166 }
1167
1168 static int
1169 vhost_user_set_vring_call(struct virtio_net **pdev, struct VhostUserMsg *msg,
1170 int main_fd __rte_unused)
1171 {
1172 struct virtio_net *dev = *pdev;
1173 struct vhost_vring_file file;
1174 struct vhost_virtqueue *vq;
1175
1176 file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1177 if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1178 file.fd = VIRTIO_INVALID_EVENTFD;
1179 else
1180 file.fd = msg->fds[0];
1181 RTE_LOG(INFO, VHOST_CONFIG,
1182 "vring call idx:%d file:%d\n", file.index, file.fd);
1183
1184 vq = dev->virtqueue[file.index];
1185 if (vq->callfd >= 0)
1186 close(vq->callfd);
1187
1188 vq->callfd = file.fd;
1189
1190 return RTE_VHOST_MSG_RESULT_OK;
1191 }
1192
1193 static int vhost_user_set_vring_err(struct virtio_net **pdev __rte_unused,
1194 struct VhostUserMsg *msg,
1195 int main_fd __rte_unused)
1196 {
1197 if (!(msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1198 close(msg->fds[0]);
1199 RTE_LOG(INFO, VHOST_CONFIG, "not implemented\n");
1200
1201 return RTE_VHOST_MSG_RESULT_OK;
1202 }
1203
1204 static int
1205 vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *msg,
1206 int main_fd __rte_unused)
1207 {
1208 struct virtio_net *dev = *pdev;
1209 struct vhost_vring_file file;
1210 struct vhost_virtqueue *vq;
1211
1212 file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1213 if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1214 file.fd = VIRTIO_INVALID_EVENTFD;
1215 else
1216 file.fd = msg->fds[0];
1217 RTE_LOG(INFO, VHOST_CONFIG,
1218 "vring kick idx:%d file:%d\n", file.index, file.fd);
1219
1220 /* Interpret ring addresses only when ring is started. */
1221 dev = translate_ring_addresses(dev, file.index);
1222 if (!dev)
1223 return RTE_VHOST_MSG_RESULT_ERR;
1224
1225 *pdev = dev;
1226
1227 vq = dev->virtqueue[file.index];
1228
1229 /*
1230 * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated,
1231 * the ring starts already enabled. Otherwise, it is enabled via
1232 * the SET_VRING_ENABLE message.
1233 */
1234 if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
1235 vq->enabled = 1;
1236 if (dev->notify_ops->vring_state_changed)
1237 dev->notify_ops->vring_state_changed(
1238 dev->vid, file.index, 1);
1239 }
1240
1241 if (vq->kickfd >= 0)
1242 close(vq->kickfd);
1243 vq->kickfd = file.fd;
1244
1245 return RTE_VHOST_MSG_RESULT_OK;
1246 }
1247
1248 static void
1249 free_zmbufs(struct vhost_virtqueue *vq)
1250 {
1251 drain_zmbuf_list(vq);
1252
1253 rte_free(vq->zmbufs);
1254 }
1255
1256 /*
1257 * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
1258 */
1259 static int
1260 vhost_user_get_vring_base(struct virtio_net **pdev,
1261 struct VhostUserMsg *msg,
1262 int main_fd __rte_unused)
1263 {
1264 struct virtio_net *dev = *pdev;
1265 struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
1266 uint64_t val;
1267
1268 /* We have to stop the queue (virtio) if it is running. */
1269 vhost_destroy_device_notify(dev);
1270
1271 dev->flags &= ~VIRTIO_DEV_READY;
1272 dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
1273
1274 /* Here we are safe to get the indexes */
1275 if (vq_is_packed(dev)) {
1276 /*
1277 * Bit[0:14]: avail index
1278 * Bit[15]: avail wrap counter
1279 */
1280 val = vq->last_avail_idx & 0x7fff;
1281 val |= vq->avail_wrap_counter << 15;
1282 msg->payload.state.num = val;
1283 } else {
1284 msg->payload.state.num = vq->last_avail_idx;
1285 }
1286
1287 RTE_LOG(INFO, VHOST_CONFIG,
1288 "vring base idx:%d file:%d\n", msg->payload.state.index,
1289 msg->payload.state.num);
1290 /*
1291 * Based on current qemu vhost-user implementation, this message is
1292 * sent and only sent in vhost_vring_stop.
1293 * TODO: cleanup the vring, it isn't usable since here.
1294 */
1295 if (vq->kickfd >= 0)
1296 close(vq->kickfd);
1297
1298 vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
1299
1300 if (vq->callfd >= 0)
1301 close(vq->callfd);
1302
1303 vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
1304
1305 vq->signalled_used_valid = false;
1306
1307 if (dev->dequeue_zero_copy)
1308 free_zmbufs(vq);
1309 if (vq_is_packed(dev)) {
1310 rte_free(vq->shadow_used_packed);
1311 vq->shadow_used_packed = NULL;
1312 } else {
1313 rte_free(vq->shadow_used_split);
1314 vq->shadow_used_split = NULL;
1315 }
1316
1317 rte_free(vq->batch_copy_elems);
1318 vq->batch_copy_elems = NULL;
1319
1320 msg->size = sizeof(msg->payload.state);
1321 msg->fd_num = 0;
1322
1323 return RTE_VHOST_MSG_RESULT_REPLY;
1324 }
1325
1326 /*
1327 * when virtio queues are ready to work, qemu will send us to
1328 * enable the virtio queue pair.
1329 */
1330 static int
1331 vhost_user_set_vring_enable(struct virtio_net **pdev,
1332 struct VhostUserMsg *msg,
1333 int main_fd __rte_unused)
1334 {
1335 struct virtio_net *dev = *pdev;
1336 int enable = (int)msg->payload.state.num;
1337 int index = (int)msg->payload.state.index;
1338 struct rte_vdpa_device *vdpa_dev;
1339 int did = -1;
1340
1341 RTE_LOG(INFO, VHOST_CONFIG,
1342 "set queue enable: %d to qp idx: %d\n",
1343 enable, index);
1344
1345 did = dev->vdpa_dev_id;
1346 vdpa_dev = rte_vdpa_get_device(did);
1347 if (vdpa_dev && vdpa_dev->ops->set_vring_state)
1348 vdpa_dev->ops->set_vring_state(dev->vid, index, enable);
1349
1350 if (dev->notify_ops->vring_state_changed)
1351 dev->notify_ops->vring_state_changed(dev->vid,
1352 index, enable);
1353
1354 /* On disable, rings have to be stopped being processed. */
1355 if (!enable && dev->dequeue_zero_copy)
1356 drain_zmbuf_list(dev->virtqueue[index]);
1357
1358 dev->virtqueue[index]->enabled = enable;
1359
1360 return RTE_VHOST_MSG_RESULT_OK;
1361 }
1362
1363 static int
1364 vhost_user_get_protocol_features(struct virtio_net **pdev,
1365 struct VhostUserMsg *msg,
1366 int main_fd __rte_unused)
1367 {
1368 struct virtio_net *dev = *pdev;
1369 uint64_t features, protocol_features;
1370
1371 rte_vhost_driver_get_features(dev->ifname, &features);
1372 rte_vhost_driver_get_protocol_features(dev->ifname, &protocol_features);
1373
1374 /*
1375 * REPLY_ACK protocol feature is only mandatory for now
1376 * for IOMMU feature. If IOMMU is explicitly disabled by the
1377 * application, disable also REPLY_ACK feature for older buggy
1378 * Qemu versions (from v2.7.0 to v2.9.0).
1379 */
1380 if (!(features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
1381 protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_REPLY_ACK);
1382
1383 msg->payload.u64 = protocol_features;
1384 msg->size = sizeof(msg->payload.u64);
1385 msg->fd_num = 0;
1386
1387 return RTE_VHOST_MSG_RESULT_REPLY;
1388 }
1389
1390 static int
1391 vhost_user_set_protocol_features(struct virtio_net **pdev,
1392 struct VhostUserMsg *msg,
1393 int main_fd __rte_unused)
1394 {
1395 struct virtio_net *dev = *pdev;
1396 uint64_t protocol_features = msg->payload.u64;
1397 uint64_t slave_protocol_features = 0;
1398
1399 rte_vhost_driver_get_protocol_features(dev->ifname,
1400 &slave_protocol_features);
1401 if (protocol_features & ~slave_protocol_features) {
1402 RTE_LOG(ERR, VHOST_CONFIG,
1403 "(%d) received invalid protocol features.\n",
1404 dev->vid);
1405 return RTE_VHOST_MSG_RESULT_ERR;
1406 }
1407
1408 dev->protocol_features = protocol_features;
1409
1410 return RTE_VHOST_MSG_RESULT_OK;
1411 }
1412
1413 static int
1414 vhost_user_set_log_base(struct virtio_net **pdev, struct VhostUserMsg *msg,
1415 int main_fd __rte_unused)
1416 {
1417 struct virtio_net *dev = *pdev;
1418 int fd = msg->fds[0];
1419 uint64_t size, off;
1420 void *addr;
1421
1422 if (fd < 0) {
1423 RTE_LOG(ERR, VHOST_CONFIG, "invalid log fd: %d\n", fd);
1424 return RTE_VHOST_MSG_RESULT_ERR;
1425 }
1426
1427 if (msg->size != sizeof(VhostUserLog)) {
1428 RTE_LOG(ERR, VHOST_CONFIG,
1429 "invalid log base msg size: %"PRId32" != %d\n",
1430 msg->size, (int)sizeof(VhostUserLog));
1431 return RTE_VHOST_MSG_RESULT_ERR;
1432 }
1433
1434 size = msg->payload.log.mmap_size;
1435 off = msg->payload.log.mmap_offset;
1436
1437 /* Don't allow mmap_offset to point outside the mmap region */
1438 if (off > size) {
1439 RTE_LOG(ERR, VHOST_CONFIG,
1440 "log offset %#"PRIx64" exceeds log size %#"PRIx64"\n",
1441 off, size);
1442 return RTE_VHOST_MSG_RESULT_ERR;
1443 }
1444
1445 RTE_LOG(INFO, VHOST_CONFIG,
1446 "log mmap size: %"PRId64", offset: %"PRId64"\n",
1447 size, off);
1448
1449 /*
1450 * mmap from 0 to workaround a hugepage mmap bug: mmap will
1451 * fail when offset is not page size aligned.
1452 */
1453 addr = mmap(0, size + off, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1454 close(fd);
1455 if (addr == MAP_FAILED) {
1456 RTE_LOG(ERR, VHOST_CONFIG, "mmap log base failed!\n");
1457 return RTE_VHOST_MSG_RESULT_ERR;
1458 }
1459
1460 /*
1461 * Free previously mapped log memory on occasionally
1462 * multiple VHOST_USER_SET_LOG_BASE.
1463 */
1464 if (dev->log_addr) {
1465 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
1466 }
1467 dev->log_addr = (uint64_t)(uintptr_t)addr;
1468 dev->log_base = dev->log_addr + off;
1469 dev->log_size = size;
1470
1471 /*
1472 * The spec is not clear about it (yet), but QEMU doesn't expect
1473 * any payload in the reply.
1474 */
1475 msg->size = 0;
1476 msg->fd_num = 0;
1477
1478 return RTE_VHOST_MSG_RESULT_REPLY;
1479 }
1480
1481 static int vhost_user_set_log_fd(struct virtio_net **pdev __rte_unused,
1482 struct VhostUserMsg *msg,
1483 int main_fd __rte_unused)
1484 {
1485 close(msg->fds[0]);
1486 RTE_LOG(INFO, VHOST_CONFIG, "not implemented.\n");
1487
1488 return RTE_VHOST_MSG_RESULT_OK;
1489 }
1490
1491 /*
1492 * An rarp packet is constructed and broadcasted to notify switches about
1493 * the new location of the migrated VM, so that packets from outside will
1494 * not be lost after migration.
1495 *
1496 * However, we don't actually "send" a rarp packet here, instead, we set
1497 * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
1498 */
1499 static int
1500 vhost_user_send_rarp(struct virtio_net **pdev, struct VhostUserMsg *msg,
1501 int main_fd __rte_unused)
1502 {
1503 struct virtio_net *dev = *pdev;
1504 uint8_t *mac = (uint8_t *)&msg->payload.u64;
1505 struct rte_vdpa_device *vdpa_dev;
1506 int did = -1;
1507
1508 RTE_LOG(DEBUG, VHOST_CONFIG,
1509 ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
1510 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
1511 memcpy(dev->mac.addr_bytes, mac, 6);
1512
1513 /*
1514 * Set the flag to inject a RARP broadcast packet at
1515 * rte_vhost_dequeue_burst().
1516 *
1517 * rte_smp_wmb() is for making sure the mac is copied
1518 * before the flag is set.
1519 */
1520 rte_smp_wmb();
1521 rte_atomic16_set(&dev->broadcast_rarp, 1);
1522 did = dev->vdpa_dev_id;
1523 vdpa_dev = rte_vdpa_get_device(did);
1524 if (vdpa_dev && vdpa_dev->ops->migration_done)
1525 vdpa_dev->ops->migration_done(dev->vid);
1526
1527 return RTE_VHOST_MSG_RESULT_OK;
1528 }
1529
1530 static int
1531 vhost_user_net_set_mtu(struct virtio_net **pdev, struct VhostUserMsg *msg,
1532 int main_fd __rte_unused)
1533 {
1534 struct virtio_net *dev = *pdev;
1535 if (msg->payload.u64 < VIRTIO_MIN_MTU ||
1536 msg->payload.u64 > VIRTIO_MAX_MTU) {
1537 RTE_LOG(ERR, VHOST_CONFIG, "Invalid MTU size (%"PRIu64")\n",
1538 msg->payload.u64);
1539
1540 return RTE_VHOST_MSG_RESULT_ERR;
1541 }
1542
1543 dev->mtu = msg->payload.u64;
1544
1545 return RTE_VHOST_MSG_RESULT_OK;
1546 }
1547
1548 static int
1549 vhost_user_set_req_fd(struct virtio_net **pdev, struct VhostUserMsg *msg,
1550 int main_fd __rte_unused)
1551 {
1552 struct virtio_net *dev = *pdev;
1553 int fd = msg->fds[0];
1554
1555 if (fd < 0) {
1556 RTE_LOG(ERR, VHOST_CONFIG,
1557 "Invalid file descriptor for slave channel (%d)\n",
1558 fd);
1559 return RTE_VHOST_MSG_RESULT_ERR;
1560 }
1561
1562 dev->slave_req_fd = fd;
1563
1564 return RTE_VHOST_MSG_RESULT_OK;
1565 }
1566
1567 static int
1568 is_vring_iotlb_update(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
1569 {
1570 struct vhost_vring_addr *ra;
1571 uint64_t start, end;
1572
1573 start = imsg->iova;
1574 end = start + imsg->size;
1575
1576 ra = &vq->ring_addrs;
1577 if (ra->desc_user_addr >= start && ra->desc_user_addr < end)
1578 return 1;
1579 if (ra->avail_user_addr >= start && ra->avail_user_addr < end)
1580 return 1;
1581 if (ra->used_user_addr >= start && ra->used_user_addr < end)
1582 return 1;
1583
1584 return 0;
1585 }
1586
1587 static int
1588 is_vring_iotlb_invalidate(struct vhost_virtqueue *vq,
1589 struct vhost_iotlb_msg *imsg)
1590 {
1591 uint64_t istart, iend, vstart, vend;
1592
1593 istart = imsg->iova;
1594 iend = istart + imsg->size - 1;
1595
1596 vstart = (uintptr_t)vq->desc;
1597 vend = vstart + sizeof(struct vring_desc) * vq->size - 1;
1598 if (vstart <= iend && istart <= vend)
1599 return 1;
1600
1601 vstart = (uintptr_t)vq->avail;
1602 vend = vstart + sizeof(struct vring_avail);
1603 vend += sizeof(uint16_t) * vq->size - 1;
1604 if (vstart <= iend && istart <= vend)
1605 return 1;
1606
1607 vstart = (uintptr_t)vq->used;
1608 vend = vstart + sizeof(struct vring_used);
1609 vend += sizeof(struct vring_used_elem) * vq->size - 1;
1610 if (vstart <= iend && istart <= vend)
1611 return 1;
1612
1613 return 0;
1614 }
1615
1616 static int
1617 vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg,
1618 int main_fd __rte_unused)
1619 {
1620 struct virtio_net *dev = *pdev;
1621 struct vhost_iotlb_msg *imsg = &msg->payload.iotlb;
1622 uint16_t i;
1623 uint64_t vva, len;
1624
1625 switch (imsg->type) {
1626 case VHOST_IOTLB_UPDATE:
1627 len = imsg->size;
1628 vva = qva_to_vva(dev, imsg->uaddr, &len);
1629 if (!vva)
1630 return RTE_VHOST_MSG_RESULT_ERR;
1631
1632 for (i = 0; i < dev->nr_vring; i++) {
1633 struct vhost_virtqueue *vq = dev->virtqueue[i];
1634
1635 vhost_user_iotlb_cache_insert(vq, imsg->iova, vva,
1636 len, imsg->perm);
1637
1638 if (is_vring_iotlb_update(vq, imsg))
1639 *pdev = dev = translate_ring_addresses(dev, i);
1640 }
1641 break;
1642 case VHOST_IOTLB_INVALIDATE:
1643 for (i = 0; i < dev->nr_vring; i++) {
1644 struct vhost_virtqueue *vq = dev->virtqueue[i];
1645
1646 vhost_user_iotlb_cache_remove(vq, imsg->iova,
1647 imsg->size);
1648
1649 if (is_vring_iotlb_invalidate(vq, imsg))
1650 vring_invalidate(dev, vq);
1651 }
1652 break;
1653 default:
1654 RTE_LOG(ERR, VHOST_CONFIG, "Invalid IOTLB message type (%d)\n",
1655 imsg->type);
1656 return RTE_VHOST_MSG_RESULT_ERR;
1657 }
1658
1659 return RTE_VHOST_MSG_RESULT_OK;
1660 }
1661
1662 static int
1663 vhost_user_set_postcopy_advise(struct virtio_net **pdev,
1664 struct VhostUserMsg *msg,
1665 int main_fd __rte_unused)
1666 {
1667 struct virtio_net *dev = *pdev;
1668 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
1669 struct uffdio_api api_struct;
1670
1671 dev->postcopy_ufd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
1672
1673 if (dev->postcopy_ufd == -1) {
1674 RTE_LOG(ERR, VHOST_CONFIG, "Userfaultfd not available: %s\n",
1675 strerror(errno));
1676 return RTE_VHOST_MSG_RESULT_ERR;
1677 }
1678 api_struct.api = UFFD_API;
1679 api_struct.features = 0;
1680 if (ioctl(dev->postcopy_ufd, UFFDIO_API, &api_struct)) {
1681 RTE_LOG(ERR, VHOST_CONFIG, "UFFDIO_API ioctl failure: %s\n",
1682 strerror(errno));
1683 close(dev->postcopy_ufd);
1684 dev->postcopy_ufd = -1;
1685 return RTE_VHOST_MSG_RESULT_ERR;
1686 }
1687 msg->fds[0] = dev->postcopy_ufd;
1688 msg->fd_num = 1;
1689
1690 return RTE_VHOST_MSG_RESULT_REPLY;
1691 #else
1692 dev->postcopy_ufd = -1;
1693 msg->fd_num = 0;
1694
1695 return RTE_VHOST_MSG_RESULT_ERR;
1696 #endif
1697 }
1698
1699 static int
1700 vhost_user_set_postcopy_listen(struct virtio_net **pdev,
1701 struct VhostUserMsg *msg __rte_unused,
1702 int main_fd __rte_unused)
1703 {
1704 struct virtio_net *dev = *pdev;
1705
1706 if (dev->mem && dev->mem->nregions) {
1707 RTE_LOG(ERR, VHOST_CONFIG,
1708 "Regions already registered at postcopy-listen\n");
1709 return RTE_VHOST_MSG_RESULT_ERR;
1710 }
1711 dev->postcopy_listening = 1;
1712
1713 return RTE_VHOST_MSG_RESULT_OK;
1714 }
1715
1716 static int
1717 vhost_user_postcopy_end(struct virtio_net **pdev, struct VhostUserMsg *msg,
1718 int main_fd __rte_unused)
1719 {
1720 struct virtio_net *dev = *pdev;
1721
1722 dev->postcopy_listening = 0;
1723 if (dev->postcopy_ufd >= 0) {
1724 close(dev->postcopy_ufd);
1725 dev->postcopy_ufd = -1;
1726 }
1727
1728 msg->payload.u64 = 0;
1729 msg->size = sizeof(msg->payload.u64);
1730 msg->fd_num = 0;
1731
1732 return RTE_VHOST_MSG_RESULT_REPLY;
1733 }
1734
1735 typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
1736 struct VhostUserMsg *msg,
1737 int main_fd);
1738 static vhost_message_handler_t vhost_message_handlers[VHOST_USER_MAX] = {
1739 [VHOST_USER_NONE] = NULL,
1740 [VHOST_USER_GET_FEATURES] = vhost_user_get_features,
1741 [VHOST_USER_SET_FEATURES] = vhost_user_set_features,
1742 [VHOST_USER_SET_OWNER] = vhost_user_set_owner,
1743 [VHOST_USER_RESET_OWNER] = vhost_user_reset_owner,
1744 [VHOST_USER_SET_MEM_TABLE] = vhost_user_set_mem_table,
1745 [VHOST_USER_SET_LOG_BASE] = vhost_user_set_log_base,
1746 [VHOST_USER_SET_LOG_FD] = vhost_user_set_log_fd,
1747 [VHOST_USER_SET_VRING_NUM] = vhost_user_set_vring_num,
1748 [VHOST_USER_SET_VRING_ADDR] = vhost_user_set_vring_addr,
1749 [VHOST_USER_SET_VRING_BASE] = vhost_user_set_vring_base,
1750 [VHOST_USER_GET_VRING_BASE] = vhost_user_get_vring_base,
1751 [VHOST_USER_SET_VRING_KICK] = vhost_user_set_vring_kick,
1752 [VHOST_USER_SET_VRING_CALL] = vhost_user_set_vring_call,
1753 [VHOST_USER_SET_VRING_ERR] = vhost_user_set_vring_err,
1754 [VHOST_USER_GET_PROTOCOL_FEATURES] = vhost_user_get_protocol_features,
1755 [VHOST_USER_SET_PROTOCOL_FEATURES] = vhost_user_set_protocol_features,
1756 [VHOST_USER_GET_QUEUE_NUM] = vhost_user_get_queue_num,
1757 [VHOST_USER_SET_VRING_ENABLE] = vhost_user_set_vring_enable,
1758 [VHOST_USER_SEND_RARP] = vhost_user_send_rarp,
1759 [VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu,
1760 [VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd,
1761 [VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
1762 [VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise,
1763 [VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
1764 [VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
1765 };
1766
1767
1768 /* return bytes# of read on success or negative val on failure. */
1769 static int
1770 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
1771 {
1772 int ret;
1773
1774 ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
1775 msg->fds, VHOST_MEMORY_MAX_NREGIONS, &msg->fd_num);
1776 if (ret <= 0)
1777 return ret;
1778
1779 if (msg->size) {
1780 if (msg->size > sizeof(msg->payload)) {
1781 RTE_LOG(ERR, VHOST_CONFIG,
1782 "invalid msg size: %d\n", msg->size);
1783 return -1;
1784 }
1785 ret = read(sockfd, &msg->payload, msg->size);
1786 if (ret <= 0)
1787 return ret;
1788 if (ret != (int)msg->size) {
1789 RTE_LOG(ERR, VHOST_CONFIG,
1790 "read control message failed\n");
1791 return -1;
1792 }
1793 }
1794
1795 return ret;
1796 }
1797
1798 static int
1799 send_vhost_message(int sockfd, struct VhostUserMsg *msg)
1800 {
1801 if (!msg)
1802 return 0;
1803
1804 return send_fd_message(sockfd, (char *)msg,
1805 VHOST_USER_HDR_SIZE + msg->size, msg->fds, msg->fd_num);
1806 }
1807
1808 static int
1809 send_vhost_reply(int sockfd, struct VhostUserMsg *msg)
1810 {
1811 if (!msg)
1812 return 0;
1813
1814 msg->flags &= ~VHOST_USER_VERSION_MASK;
1815 msg->flags &= ~VHOST_USER_NEED_REPLY;
1816 msg->flags |= VHOST_USER_VERSION;
1817 msg->flags |= VHOST_USER_REPLY_MASK;
1818
1819 return send_vhost_message(sockfd, msg);
1820 }
1821
1822 static int
1823 send_vhost_slave_message(struct virtio_net *dev, struct VhostUserMsg *msg)
1824 {
1825 int ret;
1826
1827 if (msg->flags & VHOST_USER_NEED_REPLY)
1828 rte_spinlock_lock(&dev->slave_req_lock);
1829
1830 ret = send_vhost_message(dev->slave_req_fd, msg);
1831 if (ret < 0 && (msg->flags & VHOST_USER_NEED_REPLY))
1832 rte_spinlock_unlock(&dev->slave_req_lock);
1833
1834 return ret;
1835 }
1836
1837 /*
1838 * Allocate a queue pair if it hasn't been allocated yet
1839 */
1840 static int
1841 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev,
1842 struct VhostUserMsg *msg)
1843 {
1844 uint16_t vring_idx;
1845
1846 switch (msg->request.master) {
1847 case VHOST_USER_SET_VRING_KICK:
1848 case VHOST_USER_SET_VRING_CALL:
1849 case VHOST_USER_SET_VRING_ERR:
1850 vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1851 break;
1852 case VHOST_USER_SET_VRING_NUM:
1853 case VHOST_USER_SET_VRING_BASE:
1854 case VHOST_USER_SET_VRING_ENABLE:
1855 vring_idx = msg->payload.state.index;
1856 break;
1857 case VHOST_USER_SET_VRING_ADDR:
1858 vring_idx = msg->payload.addr.index;
1859 break;
1860 default:
1861 return 0;
1862 }
1863
1864 if (vring_idx >= VHOST_MAX_VRING) {
1865 RTE_LOG(ERR, VHOST_CONFIG,
1866 "invalid vring index: %u\n", vring_idx);
1867 return -1;
1868 }
1869
1870 if (dev->virtqueue[vring_idx])
1871 return 0;
1872
1873 return alloc_vring_queue(dev, vring_idx);
1874 }
1875
1876 static void
1877 vhost_user_lock_all_queue_pairs(struct virtio_net *dev)
1878 {
1879 unsigned int i = 0;
1880 unsigned int vq_num = 0;
1881
1882 while (vq_num < dev->nr_vring) {
1883 struct vhost_virtqueue *vq = dev->virtqueue[i];
1884
1885 if (vq) {
1886 rte_spinlock_lock(&vq->access_lock);
1887 vq_num++;
1888 }
1889 i++;
1890 }
1891 }
1892
1893 static void
1894 vhost_user_unlock_all_queue_pairs(struct virtio_net *dev)
1895 {
1896 unsigned int i = 0;
1897 unsigned int vq_num = 0;
1898
1899 while (vq_num < dev->nr_vring) {
1900 struct vhost_virtqueue *vq = dev->virtqueue[i];
1901
1902 if (vq) {
1903 rte_spinlock_unlock(&vq->access_lock);
1904 vq_num++;
1905 }
1906 i++;
1907 }
1908 }
1909
1910 int
1911 vhost_user_msg_handler(int vid, int fd)
1912 {
1913 struct virtio_net *dev;
1914 struct VhostUserMsg msg;
1915 struct rte_vdpa_device *vdpa_dev;
1916 int did = -1;
1917 int ret;
1918 int unlock_required = 0;
1919 bool handled;
1920 int request;
1921
1922 dev = get_device(vid);
1923 if (dev == NULL)
1924 return -1;
1925
1926 if (!dev->notify_ops) {
1927 dev->notify_ops = vhost_driver_callback_get(dev->ifname);
1928 if (!dev->notify_ops) {
1929 RTE_LOG(ERR, VHOST_CONFIG,
1930 "failed to get callback ops for driver %s\n",
1931 dev->ifname);
1932 return -1;
1933 }
1934 }
1935
1936 ret = read_vhost_message(fd, &msg);
1937 if (ret <= 0) {
1938 if (ret < 0)
1939 RTE_LOG(ERR, VHOST_CONFIG,
1940 "vhost read message failed\n");
1941 else
1942 RTE_LOG(INFO, VHOST_CONFIG,
1943 "vhost peer closed\n");
1944
1945 return -1;
1946 }
1947
1948 ret = 0;
1949 request = msg.request.master;
1950 if (request > VHOST_USER_NONE && request < VHOST_USER_MAX &&
1951 vhost_message_str[request]) {
1952 if (request != VHOST_USER_IOTLB_MSG)
1953 RTE_LOG(INFO, VHOST_CONFIG, "read message %s\n",
1954 vhost_message_str[request]);
1955 else
1956 RTE_LOG(DEBUG, VHOST_CONFIG, "read message %s\n",
1957 vhost_message_str[request]);
1958 } else {
1959 RTE_LOG(DEBUG, VHOST_CONFIG, "External request %d\n", request);
1960 }
1961
1962 ret = vhost_user_check_and_alloc_queue_pair(dev, &msg);
1963 if (ret < 0) {
1964 RTE_LOG(ERR, VHOST_CONFIG,
1965 "failed to alloc queue\n");
1966 return -1;
1967 }
1968
1969 /*
1970 * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE
1971 * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops
1972 * and device is destroyed. destroy_device waits for queues to be
1973 * inactive, so it is safe. Otherwise taking the access_lock
1974 * would cause a dead lock.
1975 */
1976 switch (request) {
1977 case VHOST_USER_SET_FEATURES:
1978 case VHOST_USER_SET_PROTOCOL_FEATURES:
1979 case VHOST_USER_SET_OWNER:
1980 case VHOST_USER_SET_MEM_TABLE:
1981 case VHOST_USER_SET_LOG_BASE:
1982 case VHOST_USER_SET_LOG_FD:
1983 case VHOST_USER_SET_VRING_NUM:
1984 case VHOST_USER_SET_VRING_ADDR:
1985 case VHOST_USER_SET_VRING_BASE:
1986 case VHOST_USER_SET_VRING_KICK:
1987 case VHOST_USER_SET_VRING_CALL:
1988 case VHOST_USER_SET_VRING_ERR:
1989 case VHOST_USER_SET_VRING_ENABLE:
1990 case VHOST_USER_SEND_RARP:
1991 case VHOST_USER_NET_SET_MTU:
1992 case VHOST_USER_SET_SLAVE_REQ_FD:
1993 vhost_user_lock_all_queue_pairs(dev);
1994 unlock_required = 1;
1995 break;
1996 default:
1997 break;
1998
1999 }
2000
2001 handled = false;
2002 if (dev->extern_ops.pre_msg_handle) {
2003 ret = (*dev->extern_ops.pre_msg_handle)(dev->vid,
2004 (void *)&msg);
2005 switch (ret) {
2006 case RTE_VHOST_MSG_RESULT_REPLY:
2007 send_vhost_reply(fd, &msg);
2008 /* Fall-through */
2009 case RTE_VHOST_MSG_RESULT_ERR:
2010 case RTE_VHOST_MSG_RESULT_OK:
2011 handled = true;
2012 goto skip_to_post_handle;
2013 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
2014 default:
2015 break;
2016 }
2017 }
2018
2019 if (request > VHOST_USER_NONE && request < VHOST_USER_MAX) {
2020 if (!vhost_message_handlers[request])
2021 goto skip_to_post_handle;
2022 ret = vhost_message_handlers[request](&dev, &msg, fd);
2023
2024 switch (ret) {
2025 case RTE_VHOST_MSG_RESULT_ERR:
2026 RTE_LOG(ERR, VHOST_CONFIG,
2027 "Processing %s failed.\n",
2028 vhost_message_str[request]);
2029 handled = true;
2030 break;
2031 case RTE_VHOST_MSG_RESULT_OK:
2032 RTE_LOG(DEBUG, VHOST_CONFIG,
2033 "Processing %s succeeded.\n",
2034 vhost_message_str[request]);
2035 handled = true;
2036 break;
2037 case RTE_VHOST_MSG_RESULT_REPLY:
2038 RTE_LOG(DEBUG, VHOST_CONFIG,
2039 "Processing %s succeeded and needs reply.\n",
2040 vhost_message_str[request]);
2041 send_vhost_reply(fd, &msg);
2042 handled = true;
2043 break;
2044 default:
2045 break;
2046 }
2047 }
2048
2049 skip_to_post_handle:
2050 if (ret != RTE_VHOST_MSG_RESULT_ERR &&
2051 dev->extern_ops.post_msg_handle) {
2052 ret = (*dev->extern_ops.post_msg_handle)(dev->vid,
2053 (void *)&msg);
2054 switch (ret) {
2055 case RTE_VHOST_MSG_RESULT_REPLY:
2056 send_vhost_reply(fd, &msg);
2057 /* Fall-through */
2058 case RTE_VHOST_MSG_RESULT_ERR:
2059 case RTE_VHOST_MSG_RESULT_OK:
2060 handled = true;
2061 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
2062 default:
2063 break;
2064 }
2065 }
2066
2067 if (unlock_required)
2068 vhost_user_unlock_all_queue_pairs(dev);
2069
2070 /* If message was not handled at this stage, treat it as an error */
2071 if (!handled) {
2072 RTE_LOG(ERR, VHOST_CONFIG,
2073 "vhost message (req: %d) was not handled.\n", request);
2074 ret = RTE_VHOST_MSG_RESULT_ERR;
2075 }
2076
2077 /*
2078 * If the request required a reply that was already sent,
2079 * this optional reply-ack won't be sent as the
2080 * VHOST_USER_NEED_REPLY was cleared in send_vhost_reply().
2081 */
2082 if (msg.flags & VHOST_USER_NEED_REPLY) {
2083 msg.payload.u64 = ret == RTE_VHOST_MSG_RESULT_ERR;
2084 msg.size = sizeof(msg.payload.u64);
2085 msg.fd_num = 0;
2086 send_vhost_reply(fd, &msg);
2087 } else if (ret == RTE_VHOST_MSG_RESULT_ERR) {
2088 RTE_LOG(ERR, VHOST_CONFIG,
2089 "vhost message handling failed.\n");
2090 return -1;
2091 }
2092
2093 if (!(dev->flags & VIRTIO_DEV_RUNNING) && virtio_is_ready(dev)) {
2094 dev->flags |= VIRTIO_DEV_READY;
2095
2096 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
2097 if (dev->dequeue_zero_copy) {
2098 RTE_LOG(INFO, VHOST_CONFIG,
2099 "dequeue zero copy is enabled\n");
2100 }
2101
2102 if (dev->notify_ops->new_device(dev->vid) == 0)
2103 dev->flags |= VIRTIO_DEV_RUNNING;
2104 }
2105 }
2106
2107 did = dev->vdpa_dev_id;
2108 vdpa_dev = rte_vdpa_get_device(did);
2109 if (vdpa_dev && virtio_is_ready(dev) &&
2110 !(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) &&
2111 msg.request.master == VHOST_USER_SET_VRING_CALL) {
2112 if (vdpa_dev->ops->dev_conf)
2113 vdpa_dev->ops->dev_conf(dev->vid);
2114 dev->flags |= VIRTIO_DEV_VDPA_CONFIGURED;
2115 }
2116
2117 return 0;
2118 }
2119
2120 static int process_slave_message_reply(struct virtio_net *dev,
2121 const struct VhostUserMsg *msg)
2122 {
2123 struct VhostUserMsg msg_reply;
2124 int ret;
2125
2126 if ((msg->flags & VHOST_USER_NEED_REPLY) == 0)
2127 return 0;
2128
2129 if (read_vhost_message(dev->slave_req_fd, &msg_reply) < 0) {
2130 ret = -1;
2131 goto out;
2132 }
2133
2134 if (msg_reply.request.slave != msg->request.slave) {
2135 RTE_LOG(ERR, VHOST_CONFIG,
2136 "Received unexpected msg type (%u), expected %u\n",
2137 msg_reply.request.slave, msg->request.slave);
2138 ret = -1;
2139 goto out;
2140 }
2141
2142 ret = msg_reply.payload.u64 ? -1 : 0;
2143
2144 out:
2145 rte_spinlock_unlock(&dev->slave_req_lock);
2146 return ret;
2147 }
2148
2149 int
2150 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
2151 {
2152 int ret;
2153 struct VhostUserMsg msg = {
2154 .request.slave = VHOST_USER_SLAVE_IOTLB_MSG,
2155 .flags = VHOST_USER_VERSION,
2156 .size = sizeof(msg.payload.iotlb),
2157 .payload.iotlb = {
2158 .iova = iova,
2159 .perm = perm,
2160 .type = VHOST_IOTLB_MISS,
2161 },
2162 };
2163
2164 ret = send_vhost_message(dev->slave_req_fd, &msg);
2165 if (ret < 0) {
2166 RTE_LOG(ERR, VHOST_CONFIG,
2167 "Failed to send IOTLB miss message (%d)\n",
2168 ret);
2169 return ret;
2170 }
2171
2172 return 0;
2173 }
2174
2175 static int vhost_user_slave_set_vring_host_notifier(struct virtio_net *dev,
2176 int index, int fd,
2177 uint64_t offset,
2178 uint64_t size)
2179 {
2180 int ret;
2181 struct VhostUserMsg msg = {
2182 .request.slave = VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG,
2183 .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY,
2184 .size = sizeof(msg.payload.area),
2185 .payload.area = {
2186 .u64 = index & VHOST_USER_VRING_IDX_MASK,
2187 .size = size,
2188 .offset = offset,
2189 },
2190 };
2191
2192 if (fd < 0)
2193 msg.payload.area.u64 |= VHOST_USER_VRING_NOFD_MASK;
2194 else {
2195 msg.fds[0] = fd;
2196 msg.fd_num = 1;
2197 }
2198
2199 ret = send_vhost_slave_message(dev, &msg);
2200 if (ret < 0) {
2201 RTE_LOG(ERR, VHOST_CONFIG,
2202 "Failed to set host notifier (%d)\n", ret);
2203 return ret;
2204 }
2205
2206 return process_slave_message_reply(dev, &msg);
2207 }
2208
2209 int rte_vhost_host_notifier_ctrl(int vid, bool enable)
2210 {
2211 struct virtio_net *dev;
2212 struct rte_vdpa_device *vdpa_dev;
2213 int vfio_device_fd, did, ret = 0;
2214 uint64_t offset, size;
2215 unsigned int i;
2216
2217 dev = get_device(vid);
2218 if (!dev)
2219 return -ENODEV;
2220
2221 did = dev->vdpa_dev_id;
2222 if (did < 0)
2223 return -EINVAL;
2224
2225 if (!(dev->features & (1ULL << VIRTIO_F_VERSION_1)) ||
2226 !(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) ||
2227 !(dev->protocol_features &
2228 (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ)) ||
2229 !(dev->protocol_features &
2230 (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) ||
2231 !(dev->protocol_features &
2232 (1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER)))
2233 return -ENOTSUP;
2234
2235 vdpa_dev = rte_vdpa_get_device(did);
2236 if (!vdpa_dev)
2237 return -ENODEV;
2238
2239 RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_vfio_device_fd, -ENOTSUP);
2240 RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_notify_area, -ENOTSUP);
2241
2242 vfio_device_fd = vdpa_dev->ops->get_vfio_device_fd(vid);
2243 if (vfio_device_fd < 0)
2244 return -ENOTSUP;
2245
2246 if (enable) {
2247 for (i = 0; i < dev->nr_vring; i++) {
2248 if (vdpa_dev->ops->get_notify_area(vid, i, &offset,
2249 &size) < 0) {
2250 ret = -ENOTSUP;
2251 goto disable;
2252 }
2253
2254 if (vhost_user_slave_set_vring_host_notifier(dev, i,
2255 vfio_device_fd, offset, size) < 0) {
2256 ret = -EFAULT;
2257 goto disable;
2258 }
2259 }
2260 } else {
2261 disable:
2262 for (i = 0; i < dev->nr_vring; i++) {
2263 vhost_user_slave_set_vring_host_notifier(dev, i, -1,
2264 0, 0);
2265 }
2266 }
2267
2268 return ret;
2269 }
Ceph