1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2017 Intel Corporation
3 */
4
5 #include <linux/vhost.h>
6 #include <linux/virtio_net.h>
7 #include <stddef.h>
8 #include <stdint.h>
9 #include <stdlib.h>
10 #ifdef RTE_LIBRTE_VHOST_NUMA
11 #include <numa.h>
12 #include <numaif.h>
13 #endif
14
15 #include <rte_errno.h>
16 #include <rte_ethdev.h>
17 #include <rte_log.h>
18 #include <rte_string_fns.h>
19 #include <rte_memory.h>
20 #include <rte_malloc.h>
21 #include <rte_vhost.h>
22 #include <rte_rwlock.h>
23
24 #include "iotlb.h"
25 #include "vhost.h"
26 #include "vhost_user.h"
27
28 struct virtio_net *vhost_devices[MAX_VHOST_DEVICE];
29
30 /* Called with iotlb_lock read-locked */
31 uint64_t
__vhost_iova_to_vva(struct virtio_net * dev,struct vhost_virtqueue * vq,uint64_t iova,uint64_t * size,uint8_t perm)32 __vhost_iova_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
33 uint64_t iova, uint64_t *size, uint8_t perm)
34 {
35 uint64_t vva, tmp_size;
36
37 if (unlikely(!*size))
38 return 0;
39
40 tmp_size = *size;
41
42 vva = vhost_user_iotlb_cache_find(vq, iova, &tmp_size, perm);
43 if (tmp_size == *size)
44 return vva;
45
46 iova += tmp_size;
47
48 if (!vhost_user_iotlb_pending_miss(vq, iova, perm)) {
49 /*
50 * iotlb_lock is read-locked for a full burst,
51 * but it only protects the iotlb cache.
52 * In case of IOTLB miss, we might block on the socket,
53 * which could cause a deadlock with QEMU if an IOTLB update
54 * is being handled. We can safely unlock here to avoid it.
55 */
56 vhost_user_iotlb_rd_unlock(vq);
57
58 vhost_user_iotlb_pending_insert(vq, iova, perm);
59 if (vhost_user_iotlb_miss(dev, iova, perm)) {
60 VHOST_LOG_CONFIG(ERR,
61 "IOTLB miss req failed for IOVA 0x%" PRIx64 "\n",
62 iova);
63 vhost_user_iotlb_pending_remove(vq, iova, 1, perm);
64 }
65
66 vhost_user_iotlb_rd_lock(vq);
67 }
68
69 return 0;
70 }
71
72 #define VHOST_LOG_PAGE 4096
73
74 /*
75 * Atomically set a bit in memory.
76 */
77 static __rte_always_inline void
vhost_set_bit(unsigned int nr,volatile uint8_t * addr)78 vhost_set_bit(unsigned int nr, volatile uint8_t *addr)
79 {
80 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
81 /*
82 * __sync_ built-ins are deprecated, but __atomic_ ones
83 * are sub-optimized in older GCC versions.
84 */
85 __sync_fetch_and_or_1(addr, (1U << nr));
86 #else
87 __atomic_fetch_or(addr, (1U << nr), __ATOMIC_RELAXED);
88 #endif
89 }
90
91 static __rte_always_inline void
vhost_log_page(uint8_t * log_base,uint64_t page)92 vhost_log_page(uint8_t *log_base, uint64_t page)
93 {
94 vhost_set_bit(page % 8, &log_base[page / 8]);
95 }
96
97 void
__vhost_log_write(struct virtio_net * dev,uint64_t addr,uint64_t len)98 __vhost_log_write(struct virtio_net *dev, uint64_t addr, uint64_t len)
99 {
100 uint64_t page;
101
102 if (unlikely(!dev->log_base || !len))
103 return;
104
105 if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
106 return;
107
108 /* To make sure guest memory updates are committed before logging */
109 rte_smp_wmb();
110
111 page = addr / VHOST_LOG_PAGE;
112 while (page * VHOST_LOG_PAGE < addr + len) {
113 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
114 page += 1;
115 }
116 }
117
118 void
__vhost_log_write_iova(struct virtio_net * dev,struct vhost_virtqueue * vq,uint64_t iova,uint64_t len)119 __vhost_log_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
120 uint64_t iova, uint64_t len)
121 {
122 uint64_t hva, gpa, map_len;
123 map_len = len;
124
125 hva = __vhost_iova_to_vva(dev, vq, iova, &map_len, VHOST_ACCESS_RW);
126 if (map_len != len) {
127 VHOST_LOG_DATA(ERR,
128 "Failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found\n",
129 iova);
130 return;
131 }
132
133 gpa = hva_to_gpa(dev, hva, len);
134 if (gpa)
135 __vhost_log_write(dev, gpa, len);
136 }
137
138 void
__vhost_log_cache_sync(struct virtio_net * dev,struct vhost_virtqueue * vq)139 __vhost_log_cache_sync(struct virtio_net *dev, struct vhost_virtqueue *vq)
140 {
141 unsigned long *log_base;
142 int i;
143
144 if (unlikely(!dev->log_base))
145 return;
146
147 rte_smp_wmb();
148
149 log_base = (unsigned long *)(uintptr_t)dev->log_base;
150
151 for (i = 0; i < vq->log_cache_nb_elem; i++) {
152 struct log_cache_entry *elem = vq->log_cache + i;
153
154 #if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70100)
155 /*
156 * '__sync' builtins are deprecated, but '__atomic' ones
157 * are sub-optimized in older GCC versions.
158 */
159 __sync_fetch_and_or(log_base + elem->offset, elem->val);
160 #else
161 __atomic_fetch_or(log_base + elem->offset, elem->val,
162 __ATOMIC_RELAXED);
163 #endif
164 }
165
166 rte_smp_wmb();
167
168 vq->log_cache_nb_elem = 0;
169 }
170
171 static __rte_always_inline void
vhost_log_cache_page(struct virtio_net * dev,struct vhost_virtqueue * vq,uint64_t page)172 vhost_log_cache_page(struct virtio_net *dev, struct vhost_virtqueue *vq,
173 uint64_t page)
174 {
175 uint32_t bit_nr = page % (sizeof(unsigned long) << 3);
176 uint32_t offset = page / (sizeof(unsigned long) << 3);
177 int i;
178
179 for (i = 0; i < vq->log_cache_nb_elem; i++) {
180 struct log_cache_entry *elem = vq->log_cache + i;
181
182 if (elem->offset == offset) {
183 elem->val |= (1UL << bit_nr);
184 return;
185 }
186 }
187
188 if (unlikely(i >= VHOST_LOG_CACHE_NR)) {
189 /*
190 * No more room for a new log cache entry,
191 * so write the dirty log map directly.
192 */
193 rte_smp_wmb();
194 vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);
195
196 return;
197 }
198
199 vq->log_cache[i].offset = offset;
200 vq->log_cache[i].val = (1UL << bit_nr);
201 vq->log_cache_nb_elem++;
202 }
203
204 void
__vhost_log_cache_write(struct virtio_net * dev,struct vhost_virtqueue * vq,uint64_t addr,uint64_t len)205 __vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,
206 uint64_t addr, uint64_t len)
207 {
208 uint64_t page;
209
210 if (unlikely(!dev->log_base || !len))
211 return;
212
213 if (unlikely(dev->log_size <= ((addr + len - 1) / VHOST_LOG_PAGE / 8)))
214 return;
215
216 page = addr / VHOST_LOG_PAGE;
217 while (page * VHOST_LOG_PAGE < addr + len) {
218 vhost_log_cache_page(dev, vq, page);
219 page += 1;
220 }
221 }
222
223 void
__vhost_log_cache_write_iova(struct virtio_net * dev,struct vhost_virtqueue * vq,uint64_t iova,uint64_t len)224 __vhost_log_cache_write_iova(struct virtio_net *dev, struct vhost_virtqueue *vq,
225 uint64_t iova, uint64_t len)
226 {
227 uint64_t hva, gpa, map_len;
228 map_len = len;
229
230 hva = __vhost_iova_to_vva(dev, vq, iova, &map_len, VHOST_ACCESS_RW);
231 if (map_len != len) {
232 VHOST_LOG_DATA(ERR,
233 "Failed to write log for IOVA 0x%" PRIx64 ". No IOTLB entry found\n",
234 iova);
235 return;
236 }
237
238 gpa = hva_to_gpa(dev, hva, len);
239 if (gpa)
240 __vhost_log_cache_write(dev, vq, gpa, len);
241 }
242
243 void *
vhost_alloc_copy_ind_table(struct virtio_net * dev,struct vhost_virtqueue * vq,uint64_t desc_addr,uint64_t desc_len)244 vhost_alloc_copy_ind_table(struct virtio_net *dev, struct vhost_virtqueue *vq,
245 uint64_t desc_addr, uint64_t desc_len)
246 {
247 void *idesc;
248 uint64_t src, dst;
249 uint64_t len, remain = desc_len;
250
251 idesc = rte_malloc(__func__, desc_len, 0);
252 if (unlikely(!idesc))
253 return NULL;
254
255 dst = (uint64_t)(uintptr_t)idesc;
256
257 while (remain) {
258 len = remain;
259 src = vhost_iova_to_vva(dev, vq, desc_addr, &len,
260 VHOST_ACCESS_RO);
261 if (unlikely(!src || !len)) {
262 rte_free(idesc);
263 return NULL;
264 }
265
266 rte_memcpy((void *)(uintptr_t)dst, (void *)(uintptr_t)src, len);
267
268 remain -= len;
269 dst += len;
270 desc_addr += len;
271 }
272
273 return idesc;
274 }
275
276 void
cleanup_vq(struct vhost_virtqueue * vq,int destroy)277 cleanup_vq(struct vhost_virtqueue *vq, int destroy)
278 {
279 if ((vq->callfd >= 0) && (destroy != 0))
280 close(vq->callfd);
281 if (vq->kickfd >= 0)
282 close(vq->kickfd);
283 }
284
285 void
cleanup_vq_inflight(struct virtio_net * dev,struct vhost_virtqueue * vq)286 cleanup_vq_inflight(struct virtio_net *dev, struct vhost_virtqueue *vq)
287 {
288 if (!(dev->protocol_features &
289 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
290 return;
291
292 if (vq_is_packed(dev)) {
293 if (vq->inflight_packed)
294 vq->inflight_packed = NULL;
295 } else {
296 if (vq->inflight_split)
297 vq->inflight_split = NULL;
298 }
299
300 if (vq->resubmit_inflight) {
301 if (vq->resubmit_inflight->resubmit_list) {
302 free(vq->resubmit_inflight->resubmit_list);
303 vq->resubmit_inflight->resubmit_list = NULL;
304 }
305 free(vq->resubmit_inflight);
306 vq->resubmit_inflight = NULL;
307 }
308 }
309
310 /*
311 * Unmap any memory, close any file descriptors and
312 * free any memory owned by a device.
313 */
314 void
cleanup_device(struct virtio_net * dev,int destroy)315 cleanup_device(struct virtio_net *dev, int destroy)
316 {
317 uint32_t i;
318
319 vhost_backend_cleanup(dev);
320
321 for (i = 0; i < dev->nr_vring; i++) {
322 cleanup_vq(dev->virtqueue[i], destroy);
323 cleanup_vq_inflight(dev, dev->virtqueue[i]);
324 }
325 }
326
327 static void
vhost_free_async_mem(struct vhost_virtqueue * vq)328 vhost_free_async_mem(struct vhost_virtqueue *vq)
329 {
330 if (vq->async_pkts_pending)
331 rte_free(vq->async_pkts_pending);
332 if (vq->async_pkts_info)
333 rte_free(vq->async_pkts_info);
334 if (vq->it_pool)
335 rte_free(vq->it_pool);
336 if (vq->vec_pool)
337 rte_free(vq->vec_pool);
338
339 vq->async_pkts_pending = NULL;
340 vq->async_pkts_info = NULL;
341 vq->it_pool = NULL;
342 vq->vec_pool = NULL;
343 }
344
345 void
free_vq(struct virtio_net * dev,struct vhost_virtqueue * vq)346 free_vq(struct virtio_net *dev, struct vhost_virtqueue *vq)
347 {
348 if (vq_is_packed(dev))
349 rte_free(vq->shadow_used_packed);
350 else {
351 rte_free(vq->shadow_used_split);
352 vhost_free_async_mem(vq);
353 }
354 rte_free(vq->batch_copy_elems);
355 rte_mempool_free(vq->iotlb_pool);
356 rte_free(vq);
357 }
358
359 /*
360 * Release virtqueues and device memory.
361 */
362 static void
free_device(struct virtio_net * dev)363 free_device(struct virtio_net *dev)
364 {
365 uint32_t i;
366
367 for (i = 0; i < dev->nr_vring; i++)
368 free_vq(dev, dev->virtqueue[i]);
369
370 rte_free(dev);
371 }
372
373 static __rte_always_inline int
log_translate(struct virtio_net * dev,struct vhost_virtqueue * vq)374 log_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
375 {
376 if (likely(!(vq->ring_addrs.flags & (1 << VHOST_VRING_F_LOG))))
377 return 0;
378
379 vq->log_guest_addr = translate_log_addr(dev, vq,
380 vq->ring_addrs.log_guest_addr);
381 if (vq->log_guest_addr == 0)
382 return -1;
383
384 return 0;
385 }
386
387 /*
388 * Converts vring log address to GPA
389 * If IOMMU is enabled, the log address is IOVA
390 * If IOMMU not enabled, the log address is already GPA
391 *
392 * Caller should have iotlb_lock read-locked
393 */
394 uint64_t
translate_log_addr(struct virtio_net * dev,struct vhost_virtqueue * vq,uint64_t log_addr)395 translate_log_addr(struct virtio_net *dev, struct vhost_virtqueue *vq,
396 uint64_t log_addr)
397 {
398 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
399 const uint64_t exp_size = sizeof(uint64_t);
400 uint64_t hva, gpa;
401 uint64_t size = exp_size;
402
403 hva = vhost_iova_to_vva(dev, vq, log_addr,
404 &size, VHOST_ACCESS_RW);
405
406 if (size != exp_size)
407 return 0;
408
409 gpa = hva_to_gpa(dev, hva, exp_size);
410 if (!gpa) {
411 VHOST_LOG_CONFIG(ERR,
412 "VQ: Failed to find GPA for log_addr: 0x%"
413 PRIx64 " hva: 0x%" PRIx64 "\n",
414 log_addr, hva);
415 return 0;
416 }
417 return gpa;
418
419 } else
420 return log_addr;
421 }
422
423 /* Caller should have iotlb_lock read-locked */
424 static int
vring_translate_split(struct virtio_net * dev,struct vhost_virtqueue * vq)425 vring_translate_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
426 {
427 uint64_t req_size, size;
428
429 req_size = sizeof(struct vring_desc) * vq->size;
430 size = req_size;
431 vq->desc = (struct vring_desc *)(uintptr_t)vhost_iova_to_vva(dev, vq,
432 vq->ring_addrs.desc_user_addr,
433 &size, VHOST_ACCESS_RW);
434 if (!vq->desc || size != req_size)
435 return -1;
436
437 req_size = sizeof(struct vring_avail);
438 req_size += sizeof(uint16_t) * vq->size;
439 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
440 req_size += sizeof(uint16_t);
441 size = req_size;
442 vq->avail = (struct vring_avail *)(uintptr_t)vhost_iova_to_vva(dev, vq,
443 vq->ring_addrs.avail_user_addr,
444 &size, VHOST_ACCESS_RW);
445 if (!vq->avail || size != req_size)
446 return -1;
447
448 req_size = sizeof(struct vring_used);
449 req_size += sizeof(struct vring_used_elem) * vq->size;
450 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
451 req_size += sizeof(uint16_t);
452 size = req_size;
453 vq->used = (struct vring_used *)(uintptr_t)vhost_iova_to_vva(dev, vq,
454 vq->ring_addrs.used_user_addr,
455 &size, VHOST_ACCESS_RW);
456 if (!vq->used || size != req_size)
457 return -1;
458
459 return 0;
460 }
461
462 /* Caller should have iotlb_lock read-locked */
463 static int
vring_translate_packed(struct virtio_net * dev,struct vhost_virtqueue * vq)464 vring_translate_packed(struct virtio_net *dev, struct vhost_virtqueue *vq)
465 {
466 uint64_t req_size, size;
467
468 req_size = sizeof(struct vring_packed_desc) * vq->size;
469 size = req_size;
470 vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
471 vhost_iova_to_vva(dev, vq, vq->ring_addrs.desc_user_addr,
472 &size, VHOST_ACCESS_RW);
473 if (!vq->desc_packed || size != req_size)
474 return -1;
475
476 req_size = sizeof(struct vring_packed_desc_event);
477 size = req_size;
478 vq->driver_event = (struct vring_packed_desc_event *)(uintptr_t)
479 vhost_iova_to_vva(dev, vq, vq->ring_addrs.avail_user_addr,
480 &size, VHOST_ACCESS_RW);
481 if (!vq->driver_event || size != req_size)
482 return -1;
483
484 req_size = sizeof(struct vring_packed_desc_event);
485 size = req_size;
486 vq->device_event = (struct vring_packed_desc_event *)(uintptr_t)
487 vhost_iova_to_vva(dev, vq, vq->ring_addrs.used_user_addr,
488 &size, VHOST_ACCESS_RW);
489 if (!vq->device_event || size != req_size)
490 return -1;
491
492 return 0;
493 }
494
495 int
vring_translate(struct virtio_net * dev,struct vhost_virtqueue * vq)496 vring_translate(struct virtio_net *dev, struct vhost_virtqueue *vq)
497 {
498
499 if (!(dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)))
500 return -1;
501
502 if (vq_is_packed(dev)) {
503 if (vring_translate_packed(dev, vq) < 0)
504 return -1;
505 } else {
506 if (vring_translate_split(dev, vq) < 0)
507 return -1;
508 }
509
510 if (log_translate(dev, vq) < 0)
511 return -1;
512
513 vq->access_ok = 1;
514
515 return 0;
516 }
517
518 void
vring_invalidate(struct virtio_net * dev,struct vhost_virtqueue * vq)519 vring_invalidate(struct virtio_net *dev, struct vhost_virtqueue *vq)
520 {
521 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
522 vhost_user_iotlb_wr_lock(vq);
523
524 vq->access_ok = 0;
525 vq->desc = NULL;
526 vq->avail = NULL;
527 vq->used = NULL;
528 vq->log_guest_addr = 0;
529
530 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
531 vhost_user_iotlb_wr_unlock(vq);
532 }
533
534 static void
init_vring_queue(struct virtio_net * dev,uint32_t vring_idx)535 init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
536 {
537 struct vhost_virtqueue *vq;
538
539 if (vring_idx >= VHOST_MAX_VRING) {
540 VHOST_LOG_CONFIG(ERR,
541 "Failed not init vring, out of bound (%d)\n",
542 vring_idx);
543 return;
544 }
545
546 vq = dev->virtqueue[vring_idx];
547 if (!vq) {
548 VHOST_LOG_CONFIG(ERR, "Virtqueue not allocated (%d)\n",
549 vring_idx);
550 return;
551 }
552
553 memset(vq, 0, sizeof(struct vhost_virtqueue));
554
555 vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
556 vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
557 vq->notif_enable = VIRTIO_UNINITIALIZED_NOTIF;
558
559 vhost_user_iotlb_init(dev, vring_idx);
560 /* Backends are set to -1 indicating an inactive device. */
561 vq->backend = -1;
562 }
563
564 static void
reset_vring_queue(struct virtio_net * dev,uint32_t vring_idx)565 reset_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
566 {
567 struct vhost_virtqueue *vq;
568 int callfd;
569
570 if (vring_idx >= VHOST_MAX_VRING) {
571 VHOST_LOG_CONFIG(ERR,
572 "Failed not init vring, out of bound (%d)\n",
573 vring_idx);
574 return;
575 }
576
577 vq = dev->virtqueue[vring_idx];
578 if (!vq) {
579 VHOST_LOG_CONFIG(ERR, "Virtqueue not allocated (%d)\n",
580 vring_idx);
581 return;
582 }
583
584 callfd = vq->callfd;
585 init_vring_queue(dev, vring_idx);
586 vq->callfd = callfd;
587 }
588
589 int
alloc_vring_queue(struct virtio_net * dev,uint32_t vring_idx)590 alloc_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
591 {
592 struct vhost_virtqueue *vq;
593 uint32_t i;
594
595 /* Also allocate holes, if any, up to requested vring index. */
596 for (i = 0; i <= vring_idx; i++) {
597 if (dev->virtqueue[i])
598 continue;
599
600 vq = rte_malloc(NULL, sizeof(struct vhost_virtqueue), 0);
601 if (vq == NULL) {
602 VHOST_LOG_CONFIG(ERR,
603 "Failed to allocate memory for vring:%u.\n", i);
604 return -1;
605 }
606
607 dev->virtqueue[i] = vq;
608 init_vring_queue(dev, i);
609 rte_spinlock_init(&vq->access_lock);
610 vq->avail_wrap_counter = 1;
611 vq->used_wrap_counter = 1;
612 vq->signalled_used_valid = false;
613 }
614
615 dev->nr_vring = RTE_MAX(dev->nr_vring, vring_idx + 1);
616
617 return 0;
618 }
619
620 /*
621 * Reset some variables in device structure, while keeping few
622 * others untouched, such as vid, ifname, nr_vring: they
623 * should be same unless the device is removed.
624 */
625 void
reset_device(struct virtio_net * dev)626 reset_device(struct virtio_net *dev)
627 {
628 uint32_t i;
629
630 dev->features = 0;
631 dev->protocol_features = 0;
632 dev->flags &= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
633
634 for (i = 0; i < dev->nr_vring; i++)
635 reset_vring_queue(dev, i);
636 }
637
638 /*
639 * Invoked when there is a new vhost-user connection established (when
640 * there is a new virtio device being attached).
641 */
642 int
vhost_new_device(void)643 vhost_new_device(void)
644 {
645 struct virtio_net *dev;
646 int i;
647
648 for (i = 0; i < MAX_VHOST_DEVICE; i++) {
649 if (vhost_devices[i] == NULL)
650 break;
651 }
652
653 if (i == MAX_VHOST_DEVICE) {
654 VHOST_LOG_CONFIG(ERR,
655 "Failed to find a free slot for new device.\n");
656 return -1;
657 }
658
659 dev = rte_zmalloc(NULL, sizeof(struct virtio_net), 0);
660 if (dev == NULL) {
661 VHOST_LOG_CONFIG(ERR,
662 "Failed to allocate memory for new dev.\n");
663 return -1;
664 }
665
666 vhost_devices[i] = dev;
667 dev->vid = i;
668 dev->flags = VIRTIO_DEV_BUILTIN_VIRTIO_NET;
669 dev->slave_req_fd = -1;
670 dev->postcopy_ufd = -1;
671 rte_spinlock_init(&dev->slave_req_lock);
672
673 return i;
674 }
675
676 void
vhost_destroy_device_notify(struct virtio_net * dev)677 vhost_destroy_device_notify(struct virtio_net *dev)
678 {
679 struct rte_vdpa_device *vdpa_dev;
680
681 if (dev->flags & VIRTIO_DEV_RUNNING) {
682 vdpa_dev = dev->vdpa_dev;
683 if (vdpa_dev)
684 vdpa_dev->ops->dev_close(dev->vid);
685 dev->flags &= ~VIRTIO_DEV_RUNNING;
686 dev->notify_ops->destroy_device(dev->vid);
687 }
688 }
689
690 /*
691 * Invoked when there is the vhost-user connection is broken (when
692 * the virtio device is being detached).
693 */
694 void
vhost_destroy_device(int vid)695 vhost_destroy_device(int vid)
696 {
697 struct virtio_net *dev = get_device(vid);
698
699 if (dev == NULL)
700 return;
701
702 vhost_destroy_device_notify(dev);
703
704 cleanup_device(dev, 1);
705 free_device(dev);
706
707 vhost_devices[vid] = NULL;
708 }
709
710 void
vhost_attach_vdpa_device(int vid,struct rte_vdpa_device * vdpa_dev)711 vhost_attach_vdpa_device(int vid, struct rte_vdpa_device *vdpa_dev)
712 {
713 struct virtio_net *dev = get_device(vid);
714
715 if (dev == NULL)
716 return;
717
718 dev->vdpa_dev = vdpa_dev;
719 }
720
721 void
vhost_set_ifname(int vid,const char * if_name,unsigned int if_len)722 vhost_set_ifname(int vid, const char *if_name, unsigned int if_len)
723 {
724 struct virtio_net *dev;
725 unsigned int len;
726
727 dev = get_device(vid);
728 if (dev == NULL)
729 return;
730
731 len = if_len > sizeof(dev->ifname) ?
732 sizeof(dev->ifname) : if_len;
733
734 strncpy(dev->ifname, if_name, len);
735 dev->ifname[sizeof(dev->ifname) - 1] = '\0';
736 }
737
738 void
vhost_set_builtin_virtio_net(int vid,bool enable)739 vhost_set_builtin_virtio_net(int vid, bool enable)
740 {
741 struct virtio_net *dev = get_device(vid);
742
743 if (dev == NULL)
744 return;
745
746 if (enable)
747 dev->flags |= VIRTIO_DEV_BUILTIN_VIRTIO_NET;
748 else
749 dev->flags &= ~VIRTIO_DEV_BUILTIN_VIRTIO_NET;
750 }
751
752 void
vhost_enable_extbuf(int vid)753 vhost_enable_extbuf(int vid)
754 {
755 struct virtio_net *dev = get_device(vid);
756
757 if (dev == NULL)
758 return;
759
760 dev->extbuf = 1;
761 }
762
763 void
vhost_enable_linearbuf(int vid)764 vhost_enable_linearbuf(int vid)
765 {
766 struct virtio_net *dev = get_device(vid);
767
768 if (dev == NULL)
769 return;
770
771 dev->linearbuf = 1;
772 }
773
774 int
rte_vhost_get_mtu(int vid,uint16_t * mtu)775 rte_vhost_get_mtu(int vid, uint16_t *mtu)
776 {
777 struct virtio_net *dev = get_device(vid);
778
779 if (dev == NULL || mtu == NULL)
780 return -ENODEV;
781
782 if (!(dev->flags & VIRTIO_DEV_READY))
783 return -EAGAIN;
784
785 if (!(dev->features & (1ULL << VIRTIO_NET_F_MTU)))
786 return -ENOTSUP;
787
788 *mtu = dev->mtu;
789
790 return 0;
791 }
792
793 int
rte_vhost_get_numa_node(int vid)794 rte_vhost_get_numa_node(int vid)
795 {
796 #ifdef RTE_LIBRTE_VHOST_NUMA
797 struct virtio_net *dev = get_device(vid);
798 int numa_node;
799 int ret;
800
801 if (dev == NULL || numa_available() != 0)
802 return -1;
803
804 ret = get_mempolicy(&numa_node, NULL, 0, dev,
805 MPOL_F_NODE | MPOL_F_ADDR);
806 if (ret < 0) {
807 VHOST_LOG_CONFIG(ERR,
808 "(%d) failed to query numa node: %s\n",
809 vid, rte_strerror(errno));
810 return -1;
811 }
812
813 return numa_node;
814 #else
815 RTE_SET_USED(vid);
816 return -1;
817 #endif
818 }
819
820 uint32_t
rte_vhost_get_queue_num(int vid)821 rte_vhost_get_queue_num(int vid)
822 {
823 struct virtio_net *dev = get_device(vid);
824
825 if (dev == NULL)
826 return 0;
827
828 return dev->nr_vring / 2;
829 }
830
831 uint16_t
rte_vhost_get_vring_num(int vid)832 rte_vhost_get_vring_num(int vid)
833 {
834 struct virtio_net *dev = get_device(vid);
835
836 if (dev == NULL)
837 return 0;
838
839 return dev->nr_vring;
840 }
841
842 int
rte_vhost_get_ifname(int vid,char * buf,size_t len)843 rte_vhost_get_ifname(int vid, char *buf, size_t len)
844 {
845 struct virtio_net *dev = get_device(vid);
846
847 if (dev == NULL || buf == NULL)
848 return -1;
849
850 len = RTE_MIN(len, sizeof(dev->ifname));
851
852 strncpy(buf, dev->ifname, len);
853 buf[len - 1] = '\0';
854
855 return 0;
856 }
857
858 int
rte_vhost_get_negotiated_features(int vid,uint64_t * features)859 rte_vhost_get_negotiated_features(int vid, uint64_t *features)
860 {
861 struct virtio_net *dev;
862
863 dev = get_device(vid);
864 if (dev == NULL || features == NULL)
865 return -1;
866
867 *features = dev->features;
868 return 0;
869 }
870
871 int
rte_vhost_get_mem_table(int vid,struct rte_vhost_memory ** mem)872 rte_vhost_get_mem_table(int vid, struct rte_vhost_memory **mem)
873 {
874 struct virtio_net *dev;
875 struct rte_vhost_memory *m;
876 size_t size;
877
878 dev = get_device(vid);
879 if (dev == NULL || mem == NULL)
880 return -1;
881
882 size = dev->mem->nregions * sizeof(struct rte_vhost_mem_region);
883 m = malloc(sizeof(struct rte_vhost_memory) + size);
884 if (!m)
885 return -1;
886
887 m->nregions = dev->mem->nregions;
888 memcpy(m->regions, dev->mem->regions, size);
889 *mem = m;
890
891 return 0;
892 }
893
894 int
rte_vhost_get_vhost_vring(int vid,uint16_t vring_idx,struct rte_vhost_vring * vring)895 rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
896 struct rte_vhost_vring *vring)
897 {
898 struct virtio_net *dev;
899 struct vhost_virtqueue *vq;
900
901 dev = get_device(vid);
902 if (dev == NULL || vring == NULL)
903 return -1;
904
905 if (vring_idx >= VHOST_MAX_VRING)
906 return -1;
907
908 vq = dev->virtqueue[vring_idx];
909 if (!vq)
910 return -1;
911
912 if (vq_is_packed(dev)) {
913 vring->desc_packed = vq->desc_packed;
914 vring->driver_event = vq->driver_event;
915 vring->device_event = vq->device_event;
916 } else {
917 vring->desc = vq->desc;
918 vring->avail = vq->avail;
919 vring->used = vq->used;
920 }
921 vring->log_guest_addr = vq->log_guest_addr;
922
923 vring->callfd = vq->callfd;
924 vring->kickfd = vq->kickfd;
925 vring->size = vq->size;
926
927 return 0;
928 }
929
930 int
rte_vhost_get_vhost_ring_inflight(int vid,uint16_t vring_idx,struct rte_vhost_ring_inflight * vring)931 rte_vhost_get_vhost_ring_inflight(int vid, uint16_t vring_idx,
932 struct rte_vhost_ring_inflight *vring)
933 {
934 struct virtio_net *dev;
935 struct vhost_virtqueue *vq;
936
937 dev = get_device(vid);
938 if (unlikely(!dev))
939 return -1;
940
941 if (vring_idx >= VHOST_MAX_VRING)
942 return -1;
943
944 vq = dev->virtqueue[vring_idx];
945 if (unlikely(!vq))
946 return -1;
947
948 if (vq_is_packed(dev)) {
949 if (unlikely(!vq->inflight_packed))
950 return -1;
951
952 vring->inflight_packed = vq->inflight_packed;
953 } else {
954 if (unlikely(!vq->inflight_split))
955 return -1;
956
957 vring->inflight_split = vq->inflight_split;
958 }
959
960 vring->resubmit_inflight = vq->resubmit_inflight;
961
962 return 0;
963 }
964
965 int
rte_vhost_set_inflight_desc_split(int vid,uint16_t vring_idx,uint16_t idx)966 rte_vhost_set_inflight_desc_split(int vid, uint16_t vring_idx,
967 uint16_t idx)
968 {
969 struct vhost_virtqueue *vq;
970 struct virtio_net *dev;
971
972 dev = get_device(vid);
973 if (unlikely(!dev))
974 return -1;
975
976 if (unlikely(!(dev->protocol_features &
977 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
978 return 0;
979
980 if (unlikely(vq_is_packed(dev)))
981 return -1;
982
983 if (unlikely(vring_idx >= VHOST_MAX_VRING))
984 return -1;
985
986 vq = dev->virtqueue[vring_idx];
987 if (unlikely(!vq))
988 return -1;
989
990 if (unlikely(!vq->inflight_split))
991 return -1;
992
993 if (unlikely(idx >= vq->size))
994 return -1;
995
996 vq->inflight_split->desc[idx].counter = vq->global_counter++;
997 vq->inflight_split->desc[idx].inflight = 1;
998 return 0;
999 }
1000
1001 int
rte_vhost_set_inflight_desc_packed(int vid,uint16_t vring_idx,uint16_t head,uint16_t last,uint16_t * inflight_entry)1002 rte_vhost_set_inflight_desc_packed(int vid, uint16_t vring_idx,
1003 uint16_t head, uint16_t last,
1004 uint16_t *inflight_entry)
1005 {
1006 struct rte_vhost_inflight_info_packed *inflight_info;
1007 struct virtio_net *dev;
1008 struct vhost_virtqueue *vq;
1009 struct vring_packed_desc *desc;
1010 uint16_t old_free_head, free_head;
1011
1012 dev = get_device(vid);
1013 if (unlikely(!dev))
1014 return -1;
1015
1016 if (unlikely(!(dev->protocol_features &
1017 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1018 return 0;
1019
1020 if (unlikely(!vq_is_packed(dev)))
1021 return -1;
1022
1023 if (unlikely(vring_idx >= VHOST_MAX_VRING))
1024 return -1;
1025
1026 vq = dev->virtqueue[vring_idx];
1027 if (unlikely(!vq))
1028 return -1;
1029
1030 inflight_info = vq->inflight_packed;
1031 if (unlikely(!inflight_info))
1032 return -1;
1033
1034 if (unlikely(head >= vq->size))
1035 return -1;
1036
1037 desc = vq->desc_packed;
1038 old_free_head = inflight_info->old_free_head;
1039 if (unlikely(old_free_head >= vq->size))
1040 return -1;
1041
1042 free_head = old_free_head;
1043
1044 /* init header descriptor */
1045 inflight_info->desc[old_free_head].num = 0;
1046 inflight_info->desc[old_free_head].counter = vq->global_counter++;
1047 inflight_info->desc[old_free_head].inflight = 1;
1048
1049 /* save desc entry in flight entry */
1050 while (head != ((last + 1) % vq->size)) {
1051 inflight_info->desc[old_free_head].num++;
1052 inflight_info->desc[free_head].addr = desc[head].addr;
1053 inflight_info->desc[free_head].len = desc[head].len;
1054 inflight_info->desc[free_head].flags = desc[head].flags;
1055 inflight_info->desc[free_head].id = desc[head].id;
1056
1057 inflight_info->desc[old_free_head].last = free_head;
1058 free_head = inflight_info->desc[free_head].next;
1059 inflight_info->free_head = free_head;
1060 head = (head + 1) % vq->size;
1061 }
1062
1063 inflight_info->old_free_head = free_head;
1064 *inflight_entry = old_free_head;
1065
1066 return 0;
1067 }
1068
1069 int
rte_vhost_clr_inflight_desc_split(int vid,uint16_t vring_idx,uint16_t last_used_idx,uint16_t idx)1070 rte_vhost_clr_inflight_desc_split(int vid, uint16_t vring_idx,
1071 uint16_t last_used_idx, uint16_t idx)
1072 {
1073 struct virtio_net *dev;
1074 struct vhost_virtqueue *vq;
1075
1076 dev = get_device(vid);
1077 if (unlikely(!dev))
1078 return -1;
1079
1080 if (unlikely(!(dev->protocol_features &
1081 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1082 return 0;
1083
1084 if (unlikely(vq_is_packed(dev)))
1085 return -1;
1086
1087 if (unlikely(vring_idx >= VHOST_MAX_VRING))
1088 return -1;
1089
1090 vq = dev->virtqueue[vring_idx];
1091 if (unlikely(!vq))
1092 return -1;
1093
1094 if (unlikely(!vq->inflight_split))
1095 return -1;
1096
1097 if (unlikely(idx >= vq->size))
1098 return -1;
1099
1100 rte_smp_mb();
1101
1102 vq->inflight_split->desc[idx].inflight = 0;
1103
1104 rte_smp_mb();
1105
1106 vq->inflight_split->used_idx = last_used_idx;
1107 return 0;
1108 }
1109
1110 int
rte_vhost_clr_inflight_desc_packed(int vid,uint16_t vring_idx,uint16_t head)1111 rte_vhost_clr_inflight_desc_packed(int vid, uint16_t vring_idx,
1112 uint16_t head)
1113 {
1114 struct rte_vhost_inflight_info_packed *inflight_info;
1115 struct virtio_net *dev;
1116 struct vhost_virtqueue *vq;
1117
1118 dev = get_device(vid);
1119 if (unlikely(!dev))
1120 return -1;
1121
1122 if (unlikely(!(dev->protocol_features &
1123 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1124 return 0;
1125
1126 if (unlikely(!vq_is_packed(dev)))
1127 return -1;
1128
1129 if (unlikely(vring_idx >= VHOST_MAX_VRING))
1130 return -1;
1131
1132 vq = dev->virtqueue[vring_idx];
1133 if (unlikely(!vq))
1134 return -1;
1135
1136 inflight_info = vq->inflight_packed;
1137 if (unlikely(!inflight_info))
1138 return -1;
1139
1140 if (unlikely(head >= vq->size))
1141 return -1;
1142
1143 rte_smp_mb();
1144
1145 inflight_info->desc[head].inflight = 0;
1146
1147 rte_smp_mb();
1148
1149 inflight_info->old_free_head = inflight_info->free_head;
1150 inflight_info->old_used_idx = inflight_info->used_idx;
1151 inflight_info->old_used_wrap_counter = inflight_info->used_wrap_counter;
1152
1153 return 0;
1154 }
1155
1156 int
rte_vhost_set_last_inflight_io_split(int vid,uint16_t vring_idx,uint16_t idx)1157 rte_vhost_set_last_inflight_io_split(int vid, uint16_t vring_idx,
1158 uint16_t idx)
1159 {
1160 struct virtio_net *dev;
1161 struct vhost_virtqueue *vq;
1162
1163 dev = get_device(vid);
1164 if (unlikely(!dev))
1165 return -1;
1166
1167 if (unlikely(!(dev->protocol_features &
1168 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1169 return 0;
1170
1171 if (unlikely(vq_is_packed(dev)))
1172 return -1;
1173
1174 if (unlikely(vring_idx >= VHOST_MAX_VRING))
1175 return -1;
1176
1177 vq = dev->virtqueue[vring_idx];
1178 if (unlikely(!vq))
1179 return -1;
1180
1181 if (unlikely(!vq->inflight_split))
1182 return -1;
1183
1184 vq->inflight_split->last_inflight_io = idx;
1185 return 0;
1186 }
1187
1188 int
rte_vhost_set_last_inflight_io_packed(int vid,uint16_t vring_idx,uint16_t head)1189 rte_vhost_set_last_inflight_io_packed(int vid, uint16_t vring_idx,
1190 uint16_t head)
1191 {
1192 struct rte_vhost_inflight_info_packed *inflight_info;
1193 struct virtio_net *dev;
1194 struct vhost_virtqueue *vq;
1195 uint16_t last;
1196
1197 dev = get_device(vid);
1198 if (unlikely(!dev))
1199 return -1;
1200
1201 if (unlikely(!(dev->protocol_features &
1202 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
1203 return 0;
1204
1205 if (unlikely(!vq_is_packed(dev)))
1206 return -1;
1207
1208 if (unlikely(vring_idx >= VHOST_MAX_VRING))
1209 return -1;
1210
1211 vq = dev->virtqueue[vring_idx];
1212 if (unlikely(!vq))
1213 return -1;
1214
1215 inflight_info = vq->inflight_packed;
1216 if (unlikely(!inflight_info))
1217 return -1;
1218
1219 if (unlikely(head >= vq->size))
1220 return -1;
1221
1222 last = inflight_info->desc[head].last;
1223 if (unlikely(last >= vq->size))
1224 return -1;
1225
1226 inflight_info->desc[last].next = inflight_info->free_head;
1227 inflight_info->free_head = head;
1228 inflight_info->used_idx += inflight_info->desc[head].num;
1229 if (inflight_info->used_idx >= inflight_info->desc_num) {
1230 inflight_info->used_idx -= inflight_info->desc_num;
1231 inflight_info->used_wrap_counter =
1232 !inflight_info->used_wrap_counter;
1233 }
1234
1235 return 0;
1236 }
1237
1238 int
rte_vhost_vring_call(int vid,uint16_t vring_idx)1239 rte_vhost_vring_call(int vid, uint16_t vring_idx)
1240 {
1241 struct virtio_net *dev;
1242 struct vhost_virtqueue *vq;
1243
1244 dev = get_device(vid);
1245 if (!dev)
1246 return -1;
1247
1248 if (vring_idx >= VHOST_MAX_VRING)
1249 return -1;
1250
1251 vq = dev->virtqueue[vring_idx];
1252 if (!vq)
1253 return -1;
1254
1255 if (vq_is_packed(dev))
1256 vhost_vring_call_packed(dev, vq);
1257 else
1258 vhost_vring_call_split(dev, vq);
1259
1260 return 0;
1261 }
1262
1263 uint16_t
rte_vhost_avail_entries(int vid,uint16_t queue_id)1264 rte_vhost_avail_entries(int vid, uint16_t queue_id)
1265 {
1266 struct virtio_net *dev;
1267 struct vhost_virtqueue *vq;
1268 uint16_t ret = 0;
1269
1270 dev = get_device(vid);
1271 if (!dev)
1272 return 0;
1273
1274 if (queue_id >= VHOST_MAX_VRING)
1275 return 0;
1276
1277 vq = dev->virtqueue[queue_id];
1278 if (!vq)
1279 return 0;
1280
1281 rte_spinlock_lock(&vq->access_lock);
1282
1283 if (unlikely(!vq->enabled || vq->avail == NULL))
1284 goto out;
1285
1286 ret = *(volatile uint16_t *)&vq->avail->idx - vq->last_used_idx;
1287
1288 out:
1289 rte_spinlock_unlock(&vq->access_lock);
1290 return ret;
1291 }
1292
1293 static inline int
vhost_enable_notify_split(struct virtio_net * dev,struct vhost_virtqueue * vq,int enable)1294 vhost_enable_notify_split(struct virtio_net *dev,
1295 struct vhost_virtqueue *vq, int enable)
1296 {
1297 if (vq->used == NULL)
1298 return -1;
1299
1300 if (!(dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))) {
1301 if (enable)
1302 vq->used->flags &= ~VRING_USED_F_NO_NOTIFY;
1303 else
1304 vq->used->flags |= VRING_USED_F_NO_NOTIFY;
1305 } else {
1306 if (enable)
1307 vhost_avail_event(vq) = vq->last_avail_idx;
1308 }
1309 return 0;
1310 }
1311
1312 static inline int
vhost_enable_notify_packed(struct virtio_net * dev,struct vhost_virtqueue * vq,int enable)1313 vhost_enable_notify_packed(struct virtio_net *dev,
1314 struct vhost_virtqueue *vq, int enable)
1315 {
1316 uint16_t flags;
1317
1318 if (vq->device_event == NULL)
1319 return -1;
1320
1321 if (!enable) {
1322 vq->device_event->flags = VRING_EVENT_F_DISABLE;
1323 return 0;
1324 }
1325
1326 flags = VRING_EVENT_F_ENABLE;
1327 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) {
1328 flags = VRING_EVENT_F_DESC;
1329 vq->device_event->off_wrap = vq->last_avail_idx |
1330 vq->avail_wrap_counter << 15;
1331 }
1332
1333 rte_smp_wmb();
1334
1335 vq->device_event->flags = flags;
1336 return 0;
1337 }
1338
1339 int
vhost_enable_guest_notification(struct virtio_net * dev,struct vhost_virtqueue * vq,int enable)1340 vhost_enable_guest_notification(struct virtio_net *dev,
1341 struct vhost_virtqueue *vq, int enable)
1342 {
1343 /*
1344 * If the virtqueue is not ready yet, it will be applied
1345 * when it will become ready.
1346 */
1347 if (!vq->ready)
1348 return 0;
1349
1350 if (vq_is_packed(dev))
1351 return vhost_enable_notify_packed(dev, vq, enable);
1352 else
1353 return vhost_enable_notify_split(dev, vq, enable);
1354 }
1355
1356 int
rte_vhost_enable_guest_notification(int vid,uint16_t queue_id,int enable)1357 rte_vhost_enable_guest_notification(int vid, uint16_t queue_id, int enable)
1358 {
1359 struct virtio_net *dev = get_device(vid);
1360 struct vhost_virtqueue *vq;
1361 int ret;
1362
1363 if (!dev)
1364 return -1;
1365
1366 if (queue_id >= VHOST_MAX_VRING)
1367 return -1;
1368
1369 vq = dev->virtqueue[queue_id];
1370 if (!vq)
1371 return -1;
1372
1373 rte_spinlock_lock(&vq->access_lock);
1374
1375 vq->notif_enable = enable;
1376 ret = vhost_enable_guest_notification(dev, vq, enable);
1377
1378 rte_spinlock_unlock(&vq->access_lock);
1379
1380 return ret;
1381 }
1382
1383 void
rte_vhost_log_write(int vid,uint64_t addr,uint64_t len)1384 rte_vhost_log_write(int vid, uint64_t addr, uint64_t len)
1385 {
1386 struct virtio_net *dev = get_device(vid);
1387
1388 if (dev == NULL)
1389 return;
1390
1391 vhost_log_write(dev, addr, len);
1392 }
1393
1394 void
rte_vhost_log_used_vring(int vid,uint16_t vring_idx,uint64_t offset,uint64_t len)1395 rte_vhost_log_used_vring(int vid, uint16_t vring_idx,
1396 uint64_t offset, uint64_t len)
1397 {
1398 struct virtio_net *dev;
1399 struct vhost_virtqueue *vq;
1400
1401 dev = get_device(vid);
1402 if (dev == NULL)
1403 return;
1404
1405 if (vring_idx >= VHOST_MAX_VRING)
1406 return;
1407 vq = dev->virtqueue[vring_idx];
1408 if (!vq)
1409 return;
1410
1411 vhost_log_used_vring(dev, vq, offset, len);
1412 }
1413
1414 uint32_t
rte_vhost_rx_queue_count(int vid,uint16_t qid)1415 rte_vhost_rx_queue_count(int vid, uint16_t qid)
1416 {
1417 struct virtio_net *dev;
1418 struct vhost_virtqueue *vq;
1419 uint32_t ret = 0;
1420
1421 dev = get_device(vid);
1422 if (dev == NULL)
1423 return 0;
1424
1425 if (unlikely(qid >= dev->nr_vring || (qid & 1) == 0)) {
1426 VHOST_LOG_DATA(ERR, "(%d) %s: invalid virtqueue idx %d.\n",
1427 dev->vid, __func__, qid);
1428 return 0;
1429 }
1430
1431 vq = dev->virtqueue[qid];
1432 if (vq == NULL)
1433 return 0;
1434
1435 rte_spinlock_lock(&vq->access_lock);
1436
1437 if (unlikely(vq->enabled == 0 || vq->avail == NULL))
1438 goto out;
1439
1440 ret = *((volatile uint16_t *)&vq->avail->idx) - vq->last_avail_idx;
1441
1442 out:
1443 rte_spinlock_unlock(&vq->access_lock);
1444 return ret;
1445 }
1446
1447 struct rte_vdpa_device *
rte_vhost_get_vdpa_device(int vid)1448 rte_vhost_get_vdpa_device(int vid)
1449 {
1450 struct virtio_net *dev = get_device(vid);
1451
1452 if (dev == NULL)
1453 return NULL;
1454
1455 return dev->vdpa_dev;
1456 }
1457
rte_vhost_get_log_base(int vid,uint64_t * log_base,uint64_t * log_size)1458 int rte_vhost_get_log_base(int vid, uint64_t *log_base,
1459 uint64_t *log_size)
1460 {
1461 struct virtio_net *dev = get_device(vid);
1462
1463 if (dev == NULL || log_base == NULL || log_size == NULL)
1464 return -1;
1465
1466 *log_base = dev->log_base;
1467 *log_size = dev->log_size;
1468
1469 return 0;
1470 }
1471
rte_vhost_get_vring_base(int vid,uint16_t queue_id,uint16_t * last_avail_idx,uint16_t * last_used_idx)1472 int rte_vhost_get_vring_base(int vid, uint16_t queue_id,
1473 uint16_t *last_avail_idx, uint16_t *last_used_idx)
1474 {
1475 struct vhost_virtqueue *vq;
1476 struct virtio_net *dev = get_device(vid);
1477
1478 if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
1479 return -1;
1480
1481 if (queue_id >= VHOST_MAX_VRING)
1482 return -1;
1483
1484 vq = dev->virtqueue[queue_id];
1485 if (!vq)
1486 return -1;
1487
1488 if (vq_is_packed(dev)) {
1489 *last_avail_idx = (vq->avail_wrap_counter << 15) |
1490 vq->last_avail_idx;
1491 *last_used_idx = (vq->used_wrap_counter << 15) |
1492 vq->last_used_idx;
1493 } else {
1494 *last_avail_idx = vq->last_avail_idx;
1495 *last_used_idx = vq->last_used_idx;
1496 }
1497
1498 return 0;
1499 }
1500
rte_vhost_set_vring_base(int vid,uint16_t queue_id,uint16_t last_avail_idx,uint16_t last_used_idx)1501 int rte_vhost_set_vring_base(int vid, uint16_t queue_id,
1502 uint16_t last_avail_idx, uint16_t last_used_idx)
1503 {
1504 struct vhost_virtqueue *vq;
1505 struct virtio_net *dev = get_device(vid);
1506
1507 if (!dev)
1508 return -1;
1509
1510 if (queue_id >= VHOST_MAX_VRING)
1511 return -1;
1512
1513 vq = dev->virtqueue[queue_id];
1514 if (!vq)
1515 return -1;
1516
1517 if (vq_is_packed(dev)) {
1518 vq->last_avail_idx = last_avail_idx & 0x7fff;
1519 vq->avail_wrap_counter = !!(last_avail_idx & (1 << 15));
1520 vq->last_used_idx = last_used_idx & 0x7fff;
1521 vq->used_wrap_counter = !!(last_used_idx & (1 << 15));
1522 } else {
1523 vq->last_avail_idx = last_avail_idx;
1524 vq->last_used_idx = last_used_idx;
1525 }
1526
1527 return 0;
1528 }
1529
1530 int
rte_vhost_get_vring_base_from_inflight(int vid,uint16_t queue_id,uint16_t * last_avail_idx,uint16_t * last_used_idx)1531 rte_vhost_get_vring_base_from_inflight(int vid,
1532 uint16_t queue_id,
1533 uint16_t *last_avail_idx,
1534 uint16_t *last_used_idx)
1535 {
1536 struct rte_vhost_inflight_info_packed *inflight_info;
1537 struct vhost_virtqueue *vq;
1538 struct virtio_net *dev = get_device(vid);
1539
1540 if (dev == NULL || last_avail_idx == NULL || last_used_idx == NULL)
1541 return -1;
1542
1543 if (queue_id >= VHOST_MAX_VRING)
1544 return -1;
1545
1546 vq = dev->virtqueue[queue_id];
1547 if (!vq)
1548 return -1;
1549
1550 if (!vq_is_packed(dev))
1551 return -1;
1552
1553 inflight_info = vq->inflight_packed;
1554 if (!inflight_info)
1555 return -1;
1556
1557 *last_avail_idx = (inflight_info->old_used_wrap_counter << 15) |
1558 inflight_info->old_used_idx;
1559 *last_used_idx = *last_avail_idx;
1560
1561 return 0;
1562 }
1563
rte_vhost_extern_callback_register(int vid,struct rte_vhost_user_extern_ops const * const ops,void * ctx)1564 int rte_vhost_extern_callback_register(int vid,
1565 struct rte_vhost_user_extern_ops const * const ops, void *ctx)
1566 {
1567 struct virtio_net *dev = get_device(vid);
1568
1569 if (dev == NULL || ops == NULL)
1570 return -1;
1571
1572 dev->extern_ops = *ops;
1573 dev->extern_data = ctx;
1574 return 0;
1575 }
1576
rte_vhost_async_channel_register(int vid,uint16_t queue_id,uint32_t features,struct rte_vhost_async_channel_ops * ops)1577 int rte_vhost_async_channel_register(int vid, uint16_t queue_id,
1578 uint32_t features,
1579 struct rte_vhost_async_channel_ops *ops)
1580 {
1581 struct vhost_virtqueue *vq;
1582 struct virtio_net *dev = get_device(vid);
1583 struct rte_vhost_async_features f;
1584 int node;
1585
1586 if (dev == NULL || ops == NULL)
1587 return -1;
1588
1589 f.intval = features;
1590
1591 if (queue_id >= VHOST_MAX_VRING)
1592 return -1;
1593
1594 vq = dev->virtqueue[queue_id];
1595
1596 if (unlikely(vq == NULL || !dev->async_copy))
1597 return -1;
1598
1599 /* packed queue is not supported */
1600 if (unlikely(vq_is_packed(dev) || !f.async_inorder)) {
1601 VHOST_LOG_CONFIG(ERR,
1602 "async copy is not supported on packed queue or non-inorder mode "
1603 "(vid %d, qid: %d)\n", vid, queue_id);
1604 return -1;
1605 }
1606
1607 if (unlikely(ops->check_completed_copies == NULL ||
1608 ops->transfer_data == NULL))
1609 return -1;
1610
1611 rte_spinlock_lock(&vq->access_lock);
1612
1613 if (unlikely(vq->async_registered)) {
1614 VHOST_LOG_CONFIG(ERR,
1615 "async register failed: channel already registered "
1616 "(vid %d, qid: %d)\n", vid, queue_id);
1617 goto reg_out;
1618 }
1619
1620 #ifdef RTE_LIBRTE_VHOST_NUMA
1621 if (get_mempolicy(&node, NULL, 0, vq, MPOL_F_NODE | MPOL_F_ADDR)) {
1622 VHOST_LOG_CONFIG(ERR,
1623 "unable to get numa information in async register. "
1624 "allocating async buffer memory on the caller thread node\n");
1625 node = SOCKET_ID_ANY;
1626 }
1627 #else
1628 node = SOCKET_ID_ANY;
1629 #endif
1630
1631 vq->async_pkts_pending = rte_malloc_socket(NULL,
1632 vq->size * sizeof(uintptr_t),
1633 RTE_CACHE_LINE_SIZE, node);
1634 vq->async_pkts_info = rte_malloc_socket(NULL,
1635 vq->size * sizeof(struct async_inflight_info),
1636 RTE_CACHE_LINE_SIZE, node);
1637 vq->it_pool = rte_malloc_socket(NULL,
1638 VHOST_MAX_ASYNC_IT * sizeof(struct rte_vhost_iov_iter),
1639 RTE_CACHE_LINE_SIZE, node);
1640 vq->vec_pool = rte_malloc_socket(NULL,
1641 VHOST_MAX_ASYNC_VEC * sizeof(struct iovec),
1642 RTE_CACHE_LINE_SIZE, node);
1643 if (!vq->async_pkts_pending || !vq->async_pkts_info ||
1644 !vq->it_pool || !vq->vec_pool) {
1645 vhost_free_async_mem(vq);
1646 VHOST_LOG_CONFIG(ERR,
1647 "async register failed: cannot allocate memory for vq data "
1648 "(vid %d, qid: %d)\n", vid, queue_id);
1649 goto reg_out;
1650 }
1651
1652 vq->async_ops.check_completed_copies = ops->check_completed_copies;
1653 vq->async_ops.transfer_data = ops->transfer_data;
1654
1655 vq->async_inorder = f.async_inorder;
1656 vq->async_threshold = f.async_threshold;
1657
1658 vq->async_registered = true;
1659
1660 reg_out:
1661 rte_spinlock_unlock(&vq->access_lock);
1662
1663 return 0;
1664 }
1665
rte_vhost_async_channel_unregister(int vid,uint16_t queue_id)1666 int rte_vhost_async_channel_unregister(int vid, uint16_t queue_id)
1667 {
1668 struct vhost_virtqueue *vq;
1669 struct virtio_net *dev = get_device(vid);
1670 int ret = -1;
1671
1672 if (dev == NULL)
1673 return ret;
1674
1675 if (queue_id >= VHOST_MAX_VRING)
1676 return ret;
1677
1678 vq = dev->virtqueue[queue_id];
1679
1680 if (vq == NULL)
1681 return ret;
1682
1683 ret = 0;
1684
1685 if (!vq->async_registered)
1686 return ret;
1687
1688 if (!rte_spinlock_trylock(&vq->access_lock)) {
1689 VHOST_LOG_CONFIG(ERR, "Failed to unregister async channel. "
1690 "virt queue busy.\n");
1691 return -1;
1692 }
1693
1694 if (vq->async_pkts_inflight_n) {
1695 VHOST_LOG_CONFIG(ERR, "Failed to unregister async channel. "
1696 "async inflight packets must be completed before unregistration.\n");
1697 ret = -1;
1698 goto out;
1699 }
1700
1701 vhost_free_async_mem(vq);
1702
1703 vq->async_ops.transfer_data = NULL;
1704 vq->async_ops.check_completed_copies = NULL;
1705 vq->async_registered = false;
1706
1707 out:
1708 rte_spinlock_unlock(&vq->access_lock);
1709
1710 return ret;
1711 }
1712
1713 RTE_LOG_REGISTER(vhost_config_log_level, lib.vhost.config, INFO);
1714 RTE_LOG_REGISTER(vhost_data_log_level, lib.vhost.data, WARNING);
1715