1
2
3
4
5#include <stdint.h>
6#include <stdbool.h>
7#include <linux/virtio_net.h>
8
9#include <rte_mbuf.h>
10#include <rte_memcpy.h>
11#include <rte_net.h>
12#include <rte_ether.h>
13#include <rte_ip.h>
14#include <rte_dmadev.h>
15#include <rte_vhost.h>
16#include <rte_tcp.h>
17#include <rte_udp.h>
18#include <rte_sctp.h>
19#include <rte_arp.h>
20#include <rte_spinlock.h>
21#include <rte_malloc.h>
22#include <rte_vhost_async.h>
23
24#include "iotlb.h"
25#include "vhost.h"
26
27#define MAX_BATCH_LEN 256
28
29
30struct async_dma_info dma_copy_track[RTE_DMADEV_DEFAULT_MAX];
31
32static __rte_always_inline bool
33rxvq_is_mergeable(struct virtio_net *dev)
34{
35 return dev->features & (1ULL << VIRTIO_NET_F_MRG_RXBUF);
36}
37
38static __rte_always_inline bool
39virtio_net_is_inorder(struct virtio_net *dev)
40{
41 return dev->features & (1ULL << VIRTIO_F_IN_ORDER);
42}
43
44static bool
45is_valid_virt_queue_idx(uint32_t idx, int is_tx, uint32_t nr_vring)
46{
47 return (is_tx ^ (idx & 1)) == 0 && idx < nr_vring;
48}
49
50static __rte_always_inline int64_t
51vhost_async_dma_transfer_one(struct virtio_net *dev, struct vhost_virtqueue *vq,
52 int16_t dma_id, uint16_t vchan_id, uint16_t flag_idx,
53 struct vhost_iov_iter *pkt)
54{
55 struct async_dma_vchan_info *dma_info = &dma_copy_track[dma_id].vchans[vchan_id];
56 uint16_t ring_mask = dma_info->ring_mask;
57 static bool vhost_async_dma_copy_log;
58
59
60 struct vhost_iovec *iov = pkt->iov;
61 int copy_idx = 0;
62 uint32_t nr_segs = pkt->nr_segs;
63 uint16_t i;
64
65 if (rte_dma_burst_capacity(dma_id, vchan_id) < nr_segs)
66 return -1;
67
68 for (i = 0; i < nr_segs; i++) {
69 copy_idx = rte_dma_copy(dma_id, vchan_id, (rte_iova_t)iov[i].src_addr,
70 (rte_iova_t)iov[i].dst_addr, iov[i].len, RTE_DMA_OP_FLAG_LLC);
71
72
73
74
75
76
77
78
79 if (unlikely(copy_idx < 0)) {
80 if (!vhost_async_dma_copy_log) {
81 VHOST_LOG_DATA(ERR, "(%s) DMA copy failed for channel %d:%u\n",
82 dev->ifname, dma_id, vchan_id);
83 vhost_async_dma_copy_log = true;
84 }
85 return -1;
86 }
87 }
88
89
90
91
92
93 dma_info->pkts_cmpl_flag_addr[copy_idx & ring_mask] = &vq->async->pkts_cmpl_flag[flag_idx];
94
95 return nr_segs;
96}
97
98static __rte_always_inline uint16_t
99vhost_async_dma_transfer(struct virtio_net *dev, struct vhost_virtqueue *vq,
100 int16_t dma_id, uint16_t vchan_id, uint16_t head_idx,
101 struct vhost_iov_iter *pkts, uint16_t nr_pkts)
102{
103 struct async_dma_vchan_info *dma_info = &dma_copy_track[dma_id].vchans[vchan_id];
104 int64_t ret, nr_copies = 0;
105 uint16_t pkt_idx;
106
107 rte_spinlock_lock(&dma_info->dma_lock);
108
109 for (pkt_idx = 0; pkt_idx < nr_pkts; pkt_idx++) {
110 ret = vhost_async_dma_transfer_one(dev, vq, dma_id, vchan_id, head_idx,
111 &pkts[pkt_idx]);
112 if (unlikely(ret < 0))
113 break;
114
115 nr_copies += ret;
116 head_idx++;
117 if (head_idx >= vq->size)
118 head_idx -= vq->size;
119 }
120
121 if (likely(nr_copies > 0))
122 rte_dma_submit(dma_id, vchan_id);
123
124 rte_spinlock_unlock(&dma_info->dma_lock);
125
126 return pkt_idx;
127}
128
129static __rte_always_inline uint16_t
130vhost_async_dma_check_completed(struct virtio_net *dev, int16_t dma_id, uint16_t vchan_id,
131 uint16_t max_pkts)
132{
133 struct async_dma_vchan_info *dma_info = &dma_copy_track[dma_id].vchans[vchan_id];
134 uint16_t ring_mask = dma_info->ring_mask;
135 uint16_t last_idx = 0;
136 uint16_t nr_copies;
137 uint16_t copy_idx;
138 uint16_t i;
139 bool has_error = false;
140 static bool vhost_async_dma_complete_log;
141
142 rte_spinlock_lock(&dma_info->dma_lock);
143
144
145
146
147
148 nr_copies = rte_dma_completed(dma_id, vchan_id, max_pkts, &last_idx, &has_error);
149 if (unlikely(!vhost_async_dma_complete_log && has_error)) {
150 VHOST_LOG_DATA(ERR, "(%s) DMA completion failure on channel %d:%u\n", dev->ifname,
151 dma_id, vchan_id);
152 vhost_async_dma_complete_log = true;
153 } else if (nr_copies == 0) {
154 goto out;
155 }
156
157 copy_idx = last_idx - nr_copies + 1;
158 for (i = 0; i < nr_copies; i++) {
159 bool *flag;
160
161 flag = dma_info->pkts_cmpl_flag_addr[copy_idx & ring_mask];
162 if (flag) {
163
164
165
166
167
168 *flag = true;
169 dma_info->pkts_cmpl_flag_addr[copy_idx & ring_mask] = NULL;
170 }
171 copy_idx++;
172 }
173
174out:
175 rte_spinlock_unlock(&dma_info->dma_lock);
176 return nr_copies;
177}
178
179static inline void
180do_data_copy_enqueue(struct virtio_net *dev, struct vhost_virtqueue *vq)
181{
182 struct batch_copy_elem *elem = vq->batch_copy_elems;
183 uint16_t count = vq->batch_copy_nb_elems;
184 int i;
185
186 for (i = 0; i < count; i++) {
187 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
188 vhost_log_cache_write_iova(dev, vq, elem[i].log_addr,
189 elem[i].len);
190 PRINT_PACKET(dev, (uintptr_t)elem[i].dst, elem[i].len, 0);
191 }
192
193 vq->batch_copy_nb_elems = 0;
194}
195
196static inline void
197do_data_copy_dequeue(struct vhost_virtqueue *vq)
198{
199 struct batch_copy_elem *elem = vq->batch_copy_elems;
200 uint16_t count = vq->batch_copy_nb_elems;
201 int i;
202
203 for (i = 0; i < count; i++)
204 rte_memcpy(elem[i].dst, elem[i].src, elem[i].len);
205
206 vq->batch_copy_nb_elems = 0;
207}
208
209static __rte_always_inline void
210do_flush_shadow_used_ring_split(struct virtio_net *dev,
211 struct vhost_virtqueue *vq,
212 uint16_t to, uint16_t from, uint16_t size)
213{
214 rte_memcpy(&vq->used->ring[to],
215 &vq->shadow_used_split[from],
216 size * sizeof(struct vring_used_elem));
217 vhost_log_cache_used_vring(dev, vq,
218 offsetof(struct vring_used, ring[to]),
219 size * sizeof(struct vring_used_elem));
220}
221
222static __rte_always_inline void
223flush_shadow_used_ring_split(struct virtio_net *dev, struct vhost_virtqueue *vq)
224{
225 uint16_t used_idx = vq->last_used_idx & (vq->size - 1);
226
227 if (used_idx + vq->shadow_used_idx <= vq->size) {
228 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0,
229 vq->shadow_used_idx);
230 } else {
231 uint16_t size;
232
233
234 size = vq->size - used_idx;
235 do_flush_shadow_used_ring_split(dev, vq, used_idx, 0, size);
236
237
238 do_flush_shadow_used_ring_split(dev, vq, 0, size,
239 vq->shadow_used_idx - size);
240 }
241 vq->last_used_idx += vq->shadow_used_idx;
242
243 vhost_log_cache_sync(dev, vq);
244
245 __atomic_add_fetch(&vq->used->idx, vq->shadow_used_idx,
246 __ATOMIC_RELEASE);
247 vq->shadow_used_idx = 0;
248 vhost_log_used_vring(dev, vq, offsetof(struct vring_used, idx),
249 sizeof(vq->used->idx));
250}
251
252static __rte_always_inline void
253update_shadow_used_ring_split(struct vhost_virtqueue *vq,
254 uint16_t desc_idx, uint32_t len)
255{
256 uint16_t i = vq->shadow_used_idx++;
257
258 vq->shadow_used_split[i].id = desc_idx;
259 vq->shadow_used_split[i].len = len;
260}
261
262static __rte_always_inline void
263vhost_flush_enqueue_shadow_packed(struct virtio_net *dev,
264 struct vhost_virtqueue *vq)
265{
266 int i;
267 uint16_t used_idx = vq->last_used_idx;
268 uint16_t head_idx = vq->last_used_idx;
269 uint16_t head_flags = 0;
270
271
272 for (i = 0; i < vq->shadow_used_idx; i++) {
273 vq->desc_packed[used_idx].id = vq->shadow_used_packed[i].id;
274 vq->desc_packed[used_idx].len = vq->shadow_used_packed[i].len;
275
276 used_idx += vq->shadow_used_packed[i].count;
277 if (used_idx >= vq->size)
278 used_idx -= vq->size;
279 }
280
281
282 rte_atomic_thread_fence(__ATOMIC_RELEASE);
283
284 for (i = 0; i < vq->shadow_used_idx; i++) {
285 uint16_t flags;
286
287 if (vq->shadow_used_packed[i].len)
288 flags = VRING_DESC_F_WRITE;
289 else
290 flags = 0;
291
292 if (vq->used_wrap_counter) {
293 flags |= VRING_DESC_F_USED;
294 flags |= VRING_DESC_F_AVAIL;
295 } else {
296 flags &= ~VRING_DESC_F_USED;
297 flags &= ~VRING_DESC_F_AVAIL;
298 }
299
300 if (i > 0) {
301 vq->desc_packed[vq->last_used_idx].flags = flags;
302
303 vhost_log_cache_used_vring(dev, vq,
304 vq->last_used_idx *
305 sizeof(struct vring_packed_desc),
306 sizeof(struct vring_packed_desc));
307 } else {
308 head_idx = vq->last_used_idx;
309 head_flags = flags;
310 }
311
312 vq_inc_last_used_packed(vq, vq->shadow_used_packed[i].count);
313 }
314
315 vq->desc_packed[head_idx].flags = head_flags;
316
317 vhost_log_cache_used_vring(dev, vq,
318 head_idx *
319 sizeof(struct vring_packed_desc),
320 sizeof(struct vring_packed_desc));
321
322 vq->shadow_used_idx = 0;
323 vhost_log_cache_sync(dev, vq);
324}
325
326static __rte_always_inline void
327vhost_flush_dequeue_shadow_packed(struct virtio_net *dev,
328 struct vhost_virtqueue *vq)
329{
330 struct vring_used_elem_packed *used_elem = &vq->shadow_used_packed[0];
331
332 vq->desc_packed[vq->shadow_last_used_idx].id = used_elem->id;
333
334 __atomic_store_n(&vq->desc_packed[vq->shadow_last_used_idx].flags,
335 used_elem->flags, __ATOMIC_RELEASE);
336
337 vhost_log_cache_used_vring(dev, vq, vq->shadow_last_used_idx *
338 sizeof(struct vring_packed_desc),
339 sizeof(struct vring_packed_desc));
340 vq->shadow_used_idx = 0;
341 vhost_log_cache_sync(dev, vq);
342}
343
344static __rte_always_inline void
345vhost_flush_enqueue_batch_packed(struct virtio_net *dev,
346 struct vhost_virtqueue *vq,
347 uint64_t *lens,
348 uint16_t *ids)
349{
350 uint16_t i;
351 uint16_t flags;
352 uint16_t last_used_idx;
353 struct vring_packed_desc *desc_base;
354
355 last_used_idx = vq->last_used_idx;
356 desc_base = &vq->desc_packed[last_used_idx];
357
358 flags = PACKED_DESC_ENQUEUE_USED_FLAG(vq->used_wrap_counter);
359
360 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
361 desc_base[i].id = ids[i];
362 desc_base[i].len = lens[i];
363 }
364
365 rte_atomic_thread_fence(__ATOMIC_RELEASE);
366
367 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
368 desc_base[i].flags = flags;
369 }
370
371 vhost_log_cache_used_vring(dev, vq, last_used_idx *
372 sizeof(struct vring_packed_desc),
373 sizeof(struct vring_packed_desc) *
374 PACKED_BATCH_SIZE);
375 vhost_log_cache_sync(dev, vq);
376
377 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
378}
379
380static __rte_always_inline void
381vhost_shadow_dequeue_batch_packed_inorder(struct vhost_virtqueue *vq,
382 uint16_t id)
383{
384 vq->shadow_used_packed[0].id = id;
385
386 if (!vq->shadow_used_idx) {
387 vq->shadow_last_used_idx = vq->last_used_idx;
388 vq->shadow_used_packed[0].flags =
389 PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
390 vq->shadow_used_packed[0].len = 0;
391 vq->shadow_used_packed[0].count = 1;
392 vq->shadow_used_idx++;
393 }
394
395 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
396}
397
398static __rte_always_inline void
399vhost_shadow_dequeue_batch_packed(struct virtio_net *dev,
400 struct vhost_virtqueue *vq,
401 uint16_t *ids)
402{
403 uint16_t flags;
404 uint16_t i;
405 uint16_t begin;
406
407 flags = PACKED_DESC_DEQUEUE_USED_FLAG(vq->used_wrap_counter);
408
409 if (!vq->shadow_used_idx) {
410 vq->shadow_last_used_idx = vq->last_used_idx;
411 vq->shadow_used_packed[0].id = ids[0];
412 vq->shadow_used_packed[0].len = 0;
413 vq->shadow_used_packed[0].count = 1;
414 vq->shadow_used_packed[0].flags = flags;
415 vq->shadow_used_idx++;
416 begin = 1;
417 } else
418 begin = 0;
419
420 vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE) {
421 vq->desc_packed[vq->last_used_idx + i].id = ids[i];
422 vq->desc_packed[vq->last_used_idx + i].len = 0;
423 }
424
425 rte_atomic_thread_fence(__ATOMIC_RELEASE);
426 vhost_for_each_try_unroll(i, begin, PACKED_BATCH_SIZE)
427 vq->desc_packed[vq->last_used_idx + i].flags = flags;
428
429 vhost_log_cache_used_vring(dev, vq, vq->last_used_idx *
430 sizeof(struct vring_packed_desc),
431 sizeof(struct vring_packed_desc) *
432 PACKED_BATCH_SIZE);
433 vhost_log_cache_sync(dev, vq);
434
435 vq_inc_last_used_packed(vq, PACKED_BATCH_SIZE);
436}
437
438static __rte_always_inline void
439vhost_shadow_dequeue_single_packed(struct vhost_virtqueue *vq,
440 uint16_t buf_id,
441 uint16_t count)
442{
443 uint16_t flags;
444
445 flags = vq->desc_packed[vq->last_used_idx].flags;
446 if (vq->used_wrap_counter) {
447 flags |= VRING_DESC_F_USED;
448 flags |= VRING_DESC_F_AVAIL;
449 } else {
450 flags &= ~VRING_DESC_F_USED;
451 flags &= ~VRING_DESC_F_AVAIL;
452 }
453
454 if (!vq->shadow_used_idx) {
455 vq->shadow_last_used_idx = vq->last_used_idx;
456
457 vq->shadow_used_packed[0].id = buf_id;
458 vq->shadow_used_packed[0].len = 0;
459 vq->shadow_used_packed[0].flags = flags;
460 vq->shadow_used_idx++;
461 } else {
462 vq->desc_packed[vq->last_used_idx].id = buf_id;
463 vq->desc_packed[vq->last_used_idx].len = 0;
464 vq->desc_packed[vq->last_used_idx].flags = flags;
465 }
466
467 vq_inc_last_used_packed(vq, count);
468}
469
470static __rte_always_inline void
471vhost_shadow_dequeue_single_packed_inorder(struct vhost_virtqueue *vq,
472 uint16_t buf_id,
473 uint16_t count)
474{
475 uint16_t flags;
476
477 vq->shadow_used_packed[0].id = buf_id;
478
479 flags = vq->desc_packed[vq->last_used_idx].flags;
480 if (vq->used_wrap_counter) {
481 flags |= VRING_DESC_F_USED;
482 flags |= VRING_DESC_F_AVAIL;
483 } else {
484 flags &= ~VRING_DESC_F_USED;
485 flags &= ~VRING_DESC_F_AVAIL;
486 }
487
488 if (!vq->shadow_used_idx) {
489 vq->shadow_last_used_idx = vq->last_used_idx;
490 vq->shadow_used_packed[0].len = 0;
491 vq->shadow_used_packed[0].flags = flags;
492 vq->shadow_used_idx++;
493 }
494
495 vq_inc_last_used_packed(vq, count);
496}
497
498static __rte_always_inline void
499vhost_shadow_enqueue_packed(struct vhost_virtqueue *vq,
500 uint32_t *len,
501 uint16_t *id,
502 uint16_t *count,
503 uint16_t num_buffers)
504{
505 uint16_t i;
506
507 for (i = 0; i < num_buffers; i++) {
508
509 if (!vq->shadow_used_idx)
510 vq->shadow_aligned_idx = vq->last_used_idx &
511 PACKED_BATCH_MASK;
512 vq->shadow_used_packed[vq->shadow_used_idx].id = id[i];
513 vq->shadow_used_packed[vq->shadow_used_idx].len = len[i];
514 vq->shadow_used_packed[vq->shadow_used_idx].count = count[i];
515 vq->shadow_aligned_idx += count[i];
516 vq->shadow_used_idx++;
517 }
518}
519
520static __rte_always_inline void
521vhost_shadow_enqueue_single_packed(struct virtio_net *dev,
522 struct vhost_virtqueue *vq,
523 uint32_t *len,
524 uint16_t *id,
525 uint16_t *count,
526 uint16_t num_buffers)
527{
528 vhost_shadow_enqueue_packed(vq, len, id, count, num_buffers);
529
530 if (vq->shadow_aligned_idx >= PACKED_BATCH_SIZE) {
531 do_data_copy_enqueue(dev, vq);
532 vhost_flush_enqueue_shadow_packed(dev, vq);
533 }
534}
535
536
537#define ASSIGN_UNLESS_EQUAL(var, val) do { \
538 if ((var) != (val)) \
539 (var) = (val); \
540} while (0)
541
542static __rte_always_inline void
543virtio_enqueue_offload(struct rte_mbuf *m_buf, struct virtio_net_hdr *net_hdr)
544{
545 uint64_t csum_l4 = m_buf->ol_flags & RTE_MBUF_F_TX_L4_MASK;
546
547 if (m_buf->ol_flags & RTE_MBUF_F_TX_TCP_SEG)
548 csum_l4 |= RTE_MBUF_F_TX_TCP_CKSUM;
549
550 if (csum_l4) {
551 net_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
552 net_hdr->csum_start = m_buf->l2_len + m_buf->l3_len;
553
554 switch (csum_l4) {
555 case RTE_MBUF_F_TX_TCP_CKSUM:
556 net_hdr->csum_offset = (offsetof(struct rte_tcp_hdr,
557 cksum));
558 break;
559 case RTE_MBUF_F_TX_UDP_CKSUM:
560 net_hdr->csum_offset = (offsetof(struct rte_udp_hdr,
561 dgram_cksum));
562 break;
563 case RTE_MBUF_F_TX_SCTP_CKSUM:
564 net_hdr->csum_offset = (offsetof(struct rte_sctp_hdr,
565 cksum));
566 break;
567 }
568 } else {
569 ASSIGN_UNLESS_EQUAL(net_hdr->csum_start, 0);
570 ASSIGN_UNLESS_EQUAL(net_hdr->csum_offset, 0);
571 ASSIGN_UNLESS_EQUAL(net_hdr->flags, 0);
572 }
573
574
575 if (m_buf->ol_flags & RTE_MBUF_F_TX_IP_CKSUM) {
576 struct rte_ipv4_hdr *ipv4_hdr;
577
578 ipv4_hdr = rte_pktmbuf_mtod_offset(m_buf, struct rte_ipv4_hdr *,
579 m_buf->l2_len);
580 ipv4_hdr->hdr_checksum = 0;
581 ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
582 }
583
584 if (m_buf->ol_flags & RTE_MBUF_F_TX_TCP_SEG) {
585 if (m_buf->ol_flags & RTE_MBUF_F_TX_IPV4)
586 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
587 else
588 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
589 net_hdr->gso_size = m_buf->tso_segsz;
590 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len
591 + m_buf->l4_len;
592 } else if (m_buf->ol_flags & RTE_MBUF_F_TX_UDP_SEG) {
593 net_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
594 net_hdr->gso_size = m_buf->tso_segsz;
595 net_hdr->hdr_len = m_buf->l2_len + m_buf->l3_len +
596 m_buf->l4_len;
597 } else {
598 ASSIGN_UNLESS_EQUAL(net_hdr->gso_type, 0);
599 ASSIGN_UNLESS_EQUAL(net_hdr->gso_size, 0);
600 ASSIGN_UNLESS_EQUAL(net_hdr->hdr_len, 0);
601 }
602}
603
604static __rte_always_inline int
605map_one_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
606 struct buf_vector *buf_vec, uint16_t *vec_idx,
607 uint64_t desc_iova, uint64_t desc_len, uint8_t perm)
608{
609 uint16_t vec_id = *vec_idx;
610
611 while (desc_len) {
612 uint64_t desc_addr;
613 uint64_t desc_chunck_len = desc_len;
614
615 if (unlikely(vec_id >= BUF_VECTOR_MAX))
616 return -1;
617
618 desc_addr = vhost_iova_to_vva(dev, vq,
619 desc_iova,
620 &desc_chunck_len,
621 perm);
622 if (unlikely(!desc_addr))
623 return -1;
624
625 rte_prefetch0((void *)(uintptr_t)desc_addr);
626
627 buf_vec[vec_id].buf_iova = desc_iova;
628 buf_vec[vec_id].buf_addr = desc_addr;
629 buf_vec[vec_id].buf_len = desc_chunck_len;
630
631 desc_len -= desc_chunck_len;
632 desc_iova += desc_chunck_len;
633 vec_id++;
634 }
635 *vec_idx = vec_id;
636
637 return 0;
638}
639
640static __rte_always_inline int
641fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
642 uint32_t avail_idx, uint16_t *vec_idx,
643 struct buf_vector *buf_vec, uint16_t *desc_chain_head,
644 uint32_t *desc_chain_len, uint8_t perm)
645{
646 uint16_t idx = vq->avail->ring[avail_idx & (vq->size - 1)];
647 uint16_t vec_id = *vec_idx;
648 uint32_t len = 0;
649 uint64_t dlen;
650 uint32_t nr_descs = vq->size;
651 uint32_t cnt = 0;
652 struct vring_desc *descs = vq->desc;
653 struct vring_desc *idesc = NULL;
654
655 if (unlikely(idx >= vq->size))
656 return -1;
657
658 *desc_chain_head = idx;
659
660 if (vq->desc[idx].flags & VRING_DESC_F_INDIRECT) {
661 dlen = vq->desc[idx].len;
662 nr_descs = dlen / sizeof(struct vring_desc);
663 if (unlikely(nr_descs > vq->size))
664 return -1;
665
666 descs = (struct vring_desc *)(uintptr_t)
667 vhost_iova_to_vva(dev, vq, vq->desc[idx].addr,
668 &dlen,
669 VHOST_ACCESS_RO);
670 if (unlikely(!descs))
671 return -1;
672
673 if (unlikely(dlen < vq->desc[idx].len)) {
674
675
676
677
678 idesc = vhost_alloc_copy_ind_table(dev, vq,
679 vq->desc[idx].addr, vq->desc[idx].len);
680 if (unlikely(!idesc))
681 return -1;
682
683 descs = idesc;
684 }
685
686 idx = 0;
687 }
688
689 while (1) {
690 if (unlikely(idx >= nr_descs || cnt++ >= nr_descs)) {
691 free_ind_table(idesc);
692 return -1;
693 }
694
695 dlen = descs[idx].len;
696 len += dlen;
697
698 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
699 descs[idx].addr, dlen,
700 perm))) {
701 free_ind_table(idesc);
702 return -1;
703 }
704
705 if ((descs[idx].flags & VRING_DESC_F_NEXT) == 0)
706 break;
707
708 idx = descs[idx].next;
709 }
710
711 *desc_chain_len = len;
712 *vec_idx = vec_id;
713
714 if (unlikely(!!idesc))
715 free_ind_table(idesc);
716
717 return 0;
718}
719
720
721
722
723static inline int
724reserve_avail_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
725 uint32_t size, struct buf_vector *buf_vec,
726 uint16_t *num_buffers, uint16_t avail_head,
727 uint16_t *nr_vec)
728{
729 uint16_t cur_idx;
730 uint16_t vec_idx = 0;
731 uint16_t max_tries, tries = 0;
732
733 uint16_t head_idx = 0;
734 uint32_t len = 0;
735
736 *num_buffers = 0;
737 cur_idx = vq->last_avail_idx;
738
739 if (rxvq_is_mergeable(dev))
740 max_tries = vq->size - 1;
741 else
742 max_tries = 1;
743
744 while (size > 0) {
745 if (unlikely(cur_idx == avail_head))
746 return -1;
747
748
749
750
751
752 if (unlikely(++tries > max_tries))
753 return -1;
754
755 if (unlikely(fill_vec_buf_split(dev, vq, cur_idx,
756 &vec_idx, buf_vec,
757 &head_idx, &len,
758 VHOST_ACCESS_RW) < 0))
759 return -1;
760 len = RTE_MIN(len, size);
761 update_shadow_used_ring_split(vq, head_idx, len);
762 size -= len;
763
764 cur_idx++;
765 *num_buffers += 1;
766 }
767
768 *nr_vec = vec_idx;
769
770 return 0;
771}
772
773static __rte_always_inline int
774fill_vec_buf_packed_indirect(struct virtio_net *dev,
775 struct vhost_virtqueue *vq,
776 struct vring_packed_desc *desc, uint16_t *vec_idx,
777 struct buf_vector *buf_vec, uint32_t *len, uint8_t perm)
778{
779 uint16_t i;
780 uint32_t nr_descs;
781 uint16_t vec_id = *vec_idx;
782 uint64_t dlen;
783 struct vring_packed_desc *descs, *idescs = NULL;
784
785 dlen = desc->len;
786 descs = (struct vring_packed_desc *)(uintptr_t)
787 vhost_iova_to_vva(dev, vq, desc->addr, &dlen, VHOST_ACCESS_RO);
788 if (unlikely(!descs))
789 return -1;
790
791 if (unlikely(dlen < desc->len)) {
792
793
794
795
796 idescs = vhost_alloc_copy_ind_table(dev,
797 vq, desc->addr, desc->len);
798 if (unlikely(!idescs))
799 return -1;
800
801 descs = idescs;
802 }
803
804 nr_descs = desc->len / sizeof(struct vring_packed_desc);
805 if (unlikely(nr_descs >= vq->size)) {
806 free_ind_table(idescs);
807 return -1;
808 }
809
810 for (i = 0; i < nr_descs; i++) {
811 if (unlikely(vec_id >= BUF_VECTOR_MAX)) {
812 free_ind_table(idescs);
813 return -1;
814 }
815
816 dlen = descs[i].len;
817 *len += dlen;
818 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
819 descs[i].addr, dlen,
820 perm)))
821 return -1;
822 }
823 *vec_idx = vec_id;
824
825 if (unlikely(!!idescs))
826 free_ind_table(idescs);
827
828 return 0;
829}
830
831static __rte_always_inline int
832fill_vec_buf_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
833 uint16_t avail_idx, uint16_t *desc_count,
834 struct buf_vector *buf_vec, uint16_t *vec_idx,
835 uint16_t *buf_id, uint32_t *len, uint8_t perm)
836{
837 bool wrap_counter = vq->avail_wrap_counter;
838 struct vring_packed_desc *descs = vq->desc_packed;
839 uint16_t vec_id = *vec_idx;
840 uint64_t dlen;
841
842 if (avail_idx < vq->last_avail_idx)
843 wrap_counter ^= 1;
844
845
846
847
848
849
850 if (unlikely(!desc_is_avail(&descs[avail_idx], wrap_counter)))
851 return -1;
852
853 *desc_count = 0;
854 *len = 0;
855
856 while (1) {
857 if (unlikely(vec_id >= BUF_VECTOR_MAX))
858 return -1;
859
860 if (unlikely(*desc_count >= vq->size))
861 return -1;
862
863 *desc_count += 1;
864 *buf_id = descs[avail_idx].id;
865
866 if (descs[avail_idx].flags & VRING_DESC_F_INDIRECT) {
867 if (unlikely(fill_vec_buf_packed_indirect(dev, vq,
868 &descs[avail_idx],
869 &vec_id, buf_vec,
870 len, perm) < 0))
871 return -1;
872 } else {
873 dlen = descs[avail_idx].len;
874 *len += dlen;
875
876 if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
877 descs[avail_idx].addr,
878 dlen,
879 perm)))
880 return -1;
881 }
882
883 if ((descs[avail_idx].flags & VRING_DESC_F_NEXT) == 0)
884 break;
885
886 if (++avail_idx >= vq->size) {
887 avail_idx -= vq->size;
888 wrap_counter ^= 1;
889 }
890 }
891
892 *vec_idx = vec_id;
893
894 return 0;
895}
896
897static __rte_noinline void
898copy_vnet_hdr_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
899 struct buf_vector *buf_vec,
900 struct virtio_net_hdr_mrg_rxbuf *hdr)
901{
902 uint64_t len;
903 uint64_t remain = dev->vhost_hlen;
904 uint64_t src = (uint64_t)(uintptr_t)hdr, dst;
905 uint64_t iova = buf_vec->buf_iova;
906
907 while (remain) {
908 len = RTE_MIN(remain,
909 buf_vec->buf_len);
910 dst = buf_vec->buf_addr;
911 rte_memcpy((void *)(uintptr_t)dst,
912 (void *)(uintptr_t)src,
913 len);
914
915 PRINT_PACKET(dev, (uintptr_t)dst,
916 (uint32_t)len, 0);
917 vhost_log_cache_write_iova(dev, vq,
918 iova, len);
919
920 remain -= len;
921 iova += len;
922 src += len;
923 buf_vec++;
924 }
925}
926
927static __rte_always_inline int
928async_iter_initialize(struct virtio_net *dev, struct vhost_async *async)
929{
930 struct vhost_iov_iter *iter;
931
932 if (unlikely(async->iovec_idx >= VHOST_MAX_ASYNC_VEC)) {
933 VHOST_LOG_DATA(ERR, "(%s) no more async iovec available\n", dev->ifname);
934 return -1;
935 }
936
937 iter = async->iov_iter + async->iter_idx;
938 iter->iov = async->iovec + async->iovec_idx;
939 iter->nr_segs = 0;
940
941 return 0;
942}
943
944static __rte_always_inline int
945async_iter_add_iovec(struct virtio_net *dev, struct vhost_async *async,
946 void *src, void *dst, size_t len)
947{
948 struct vhost_iov_iter *iter;
949 struct vhost_iovec *iovec;
950
951 if (unlikely(async->iovec_idx >= VHOST_MAX_ASYNC_VEC)) {
952 static bool vhost_max_async_vec_log;
953
954 if (!vhost_max_async_vec_log) {
955 VHOST_LOG_DATA(ERR, "(%s) no more async iovec available\n", dev->ifname);
956 vhost_max_async_vec_log = true;
957 }
958
959 return -1;
960 }
961
962 iter = async->iov_iter + async->iter_idx;
963 iovec = async->iovec + async->iovec_idx;
964
965 iovec->src_addr = src;
966 iovec->dst_addr = dst;
967 iovec->len = len;
968
969 iter->nr_segs++;
970 async->iovec_idx++;
971
972 return 0;
973}
974
975static __rte_always_inline void
976async_iter_finalize(struct vhost_async *async)
977{
978 async->iter_idx++;
979}
980
981static __rte_always_inline void
982async_iter_cancel(struct vhost_async *async)
983{
984 struct vhost_iov_iter *iter;
985
986 iter = async->iov_iter + async->iter_idx;
987 async->iovec_idx -= iter->nr_segs;
988 iter->nr_segs = 0;
989 iter->iov = NULL;
990}
991
992static __rte_always_inline void
993async_iter_reset(struct vhost_async *async)
994{
995 async->iter_idx = 0;
996 async->iovec_idx = 0;
997}
998
999static __rte_always_inline int
1000async_mbuf_to_desc_seg(struct virtio_net *dev, struct vhost_virtqueue *vq,
1001 struct rte_mbuf *m, uint32_t mbuf_offset,
1002 uint64_t buf_iova, uint32_t cpy_len)
1003{
1004 struct vhost_async *async = vq->async;
1005 uint64_t mapped_len;
1006 uint32_t buf_offset = 0;
1007 void *host_iova;
1008
1009 while (cpy_len) {
1010 host_iova = (void *)(uintptr_t)gpa_to_first_hpa(dev,
1011 buf_iova + buf_offset, cpy_len, &mapped_len);
1012 if (unlikely(!host_iova)) {
1013 VHOST_LOG_DATA(ERR, "(%s) %s: failed to get host iova.\n",
1014 dev->ifname, __func__);
1015 return -1;
1016 }
1017
1018 if (unlikely(async_iter_add_iovec(dev, async,
1019 (void *)(uintptr_t)rte_pktmbuf_iova_offset(m,
1020 mbuf_offset),
1021 host_iova, (size_t)mapped_len)))
1022 return -1;
1023
1024 cpy_len -= (uint32_t)mapped_len;
1025 mbuf_offset += (uint32_t)mapped_len;
1026 buf_offset += (uint32_t)mapped_len;
1027 }
1028
1029 return 0;
1030}
1031
1032static __rte_always_inline void
1033sync_mbuf_to_desc_seg(struct virtio_net *dev, struct vhost_virtqueue *vq,
1034 struct rte_mbuf *m, uint32_t mbuf_offset,
1035 uint64_t buf_addr, uint64_t buf_iova, uint32_t cpy_len)
1036{
1037 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
1038
1039 if (likely(cpy_len > MAX_BATCH_LEN || vq->batch_copy_nb_elems >= vq->size)) {
1040 rte_memcpy((void *)((uintptr_t)(buf_addr)),
1041 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset),
1042 cpy_len);
1043 vhost_log_cache_write_iova(dev, vq, buf_iova, cpy_len);
1044 PRINT_PACKET(dev, (uintptr_t)(buf_addr), cpy_len, 0);
1045 } else {
1046 batch_copy[vq->batch_copy_nb_elems].dst =
1047 (void *)((uintptr_t)(buf_addr));
1048 batch_copy[vq->batch_copy_nb_elems].src =
1049 rte_pktmbuf_mtod_offset(m, void *, mbuf_offset);
1050 batch_copy[vq->batch_copy_nb_elems].log_addr = buf_iova;
1051 batch_copy[vq->batch_copy_nb_elems].len = cpy_len;
1052 vq->batch_copy_nb_elems++;
1053 }
1054}
1055
1056static __rte_always_inline int
1057mbuf_to_desc(struct virtio_net *dev, struct vhost_virtqueue *vq,
1058 struct rte_mbuf *m, struct buf_vector *buf_vec,
1059 uint16_t nr_vec, uint16_t num_buffers, bool is_async)
1060{
1061 uint32_t vec_idx = 0;
1062 uint32_t mbuf_offset, mbuf_avail;
1063 uint32_t buf_offset, buf_avail;
1064 uint64_t buf_addr, buf_iova, buf_len;
1065 uint32_t cpy_len;
1066 uint64_t hdr_addr;
1067 struct rte_mbuf *hdr_mbuf;
1068 struct virtio_net_hdr_mrg_rxbuf tmp_hdr, *hdr = NULL;
1069 struct vhost_async *async = vq->async;
1070
1071 if (unlikely(m == NULL))
1072 return -1;
1073
1074 buf_addr = buf_vec[vec_idx].buf_addr;
1075 buf_iova = buf_vec[vec_idx].buf_iova;
1076 buf_len = buf_vec[vec_idx].buf_len;
1077
1078 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1))
1079 return -1;
1080
1081 hdr_mbuf = m;
1082 hdr_addr = buf_addr;
1083 if (unlikely(buf_len < dev->vhost_hlen)) {
1084 memset(&tmp_hdr, 0, sizeof(struct virtio_net_hdr_mrg_rxbuf));
1085 hdr = &tmp_hdr;
1086 } else
1087 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(uintptr_t)hdr_addr;
1088
1089 VHOST_LOG_DATA(DEBUG, "(%s) RX: num merge buffers %d\n",
1090 dev->ifname, num_buffers);
1091
1092 if (unlikely(buf_len < dev->vhost_hlen)) {
1093 buf_offset = dev->vhost_hlen - buf_len;
1094 vec_idx++;
1095 buf_addr = buf_vec[vec_idx].buf_addr;
1096 buf_iova = buf_vec[vec_idx].buf_iova;
1097 buf_len = buf_vec[vec_idx].buf_len;
1098 buf_avail = buf_len - buf_offset;
1099 } else {
1100 buf_offset = dev->vhost_hlen;
1101 buf_avail = buf_len - dev->vhost_hlen;
1102 }
1103
1104 mbuf_avail = rte_pktmbuf_data_len(m);
1105 mbuf_offset = 0;
1106
1107 if (is_async) {
1108 if (async_iter_initialize(dev, async))
1109 return -1;
1110 }
1111
1112 while (mbuf_avail != 0 || m->next != NULL) {
1113
1114 if (buf_avail == 0) {
1115 vec_idx++;
1116 if (unlikely(vec_idx >= nr_vec))
1117 goto error;
1118
1119 buf_addr = buf_vec[vec_idx].buf_addr;
1120 buf_iova = buf_vec[vec_idx].buf_iova;
1121 buf_len = buf_vec[vec_idx].buf_len;
1122
1123 buf_offset = 0;
1124 buf_avail = buf_len;
1125 }
1126
1127
1128 if (mbuf_avail == 0) {
1129 m = m->next;
1130
1131 mbuf_offset = 0;
1132 mbuf_avail = rte_pktmbuf_data_len(m);
1133 }
1134
1135 if (hdr_addr) {
1136 virtio_enqueue_offload(hdr_mbuf, &hdr->hdr);
1137 if (rxvq_is_mergeable(dev))
1138 ASSIGN_UNLESS_EQUAL(hdr->num_buffers,
1139 num_buffers);
1140
1141 if (unlikely(hdr == &tmp_hdr)) {
1142 copy_vnet_hdr_to_desc(dev, vq, buf_vec, hdr);
1143 } else {
1144 PRINT_PACKET(dev, (uintptr_t)hdr_addr,
1145 dev->vhost_hlen, 0);
1146 vhost_log_cache_write_iova(dev, vq,
1147 buf_vec[0].buf_iova,
1148 dev->vhost_hlen);
1149 }
1150
1151 hdr_addr = 0;
1152 }
1153
1154 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
1155
1156 if (is_async) {
1157 if (async_mbuf_to_desc_seg(dev, vq, m, mbuf_offset,
1158 buf_iova + buf_offset, cpy_len) < 0)
1159 goto error;
1160 } else {
1161 sync_mbuf_to_desc_seg(dev, vq, m, mbuf_offset,
1162 buf_addr + buf_offset,
1163 buf_iova + buf_offset, cpy_len);
1164 }
1165
1166 mbuf_avail -= cpy_len;
1167 mbuf_offset += cpy_len;
1168 buf_avail -= cpy_len;
1169 buf_offset += cpy_len;
1170 }
1171
1172 if (is_async)
1173 async_iter_finalize(async);
1174
1175 return 0;
1176error:
1177 if (is_async)
1178 async_iter_cancel(async);
1179
1180 return -1;
1181}
1182
1183static __rte_always_inline int
1184vhost_enqueue_single_packed(struct virtio_net *dev,
1185 struct vhost_virtqueue *vq,
1186 struct rte_mbuf *pkt,
1187 struct buf_vector *buf_vec,
1188 uint16_t *nr_descs)
1189{
1190 uint16_t nr_vec = 0;
1191 uint16_t avail_idx = vq->last_avail_idx;
1192 uint16_t max_tries, tries = 0;
1193 uint16_t buf_id = 0;
1194 uint32_t len = 0;
1195 uint16_t desc_count;
1196 uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
1197 uint16_t num_buffers = 0;
1198 uint32_t buffer_len[vq->size];
1199 uint16_t buffer_buf_id[vq->size];
1200 uint16_t buffer_desc_count[vq->size];
1201
1202 if (rxvq_is_mergeable(dev))
1203 max_tries = vq->size - 1;
1204 else
1205 max_tries = 1;
1206
1207 while (size > 0) {
1208
1209
1210
1211
1212
1213 if (unlikely(++tries > max_tries))
1214 return -1;
1215
1216 if (unlikely(fill_vec_buf_packed(dev, vq,
1217 avail_idx, &desc_count,
1218 buf_vec, &nr_vec,
1219 &buf_id, &len,
1220 VHOST_ACCESS_RW) < 0))
1221 return -1;
1222
1223 len = RTE_MIN(len, size);
1224 size -= len;
1225
1226 buffer_len[num_buffers] = len;
1227 buffer_buf_id[num_buffers] = buf_id;
1228 buffer_desc_count[num_buffers] = desc_count;
1229 num_buffers += 1;
1230
1231 *nr_descs += desc_count;
1232 avail_idx += desc_count;
1233 if (avail_idx >= vq->size)
1234 avail_idx -= vq->size;
1235 }
1236
1237 if (mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec, num_buffers, false) < 0)
1238 return -1;
1239
1240 vhost_shadow_enqueue_single_packed(dev, vq, buffer_len, buffer_buf_id,
1241 buffer_desc_count, num_buffers);
1242
1243 return 0;
1244}
1245
1246static __rte_noinline uint32_t
1247virtio_dev_rx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
1248 struct rte_mbuf **pkts, uint32_t count)
1249{
1250 uint32_t pkt_idx = 0;
1251 uint16_t num_buffers;
1252 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1253 uint16_t avail_head;
1254
1255
1256
1257
1258
1259 avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
1260
1261 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1262
1263 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
1264 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
1265 uint16_t nr_vec = 0;
1266
1267 if (unlikely(reserve_avail_buf_split(dev, vq,
1268 pkt_len, buf_vec, &num_buffers,
1269 avail_head, &nr_vec) < 0)) {
1270 VHOST_LOG_DATA(DEBUG,
1271 "(%s) failed to get enough desc from vring\n",
1272 dev->ifname);
1273 vq->shadow_used_idx -= num_buffers;
1274 break;
1275 }
1276
1277 VHOST_LOG_DATA(DEBUG, "(%s) current index %d | end index %d\n",
1278 dev->ifname, vq->last_avail_idx,
1279 vq->last_avail_idx + num_buffers);
1280
1281 if (mbuf_to_desc(dev, vq, pkts[pkt_idx], buf_vec, nr_vec,
1282 num_buffers, false) < 0) {
1283 vq->shadow_used_idx -= num_buffers;
1284 break;
1285 }
1286
1287 vq->last_avail_idx += num_buffers;
1288 }
1289
1290 do_data_copy_enqueue(dev, vq);
1291
1292 if (likely(vq->shadow_used_idx)) {
1293 flush_shadow_used_ring_split(dev, vq);
1294 vhost_vring_call_split(dev, vq);
1295 }
1296
1297 return pkt_idx;
1298}
1299
1300static __rte_always_inline int
1301virtio_dev_rx_sync_batch_check(struct virtio_net *dev,
1302 struct vhost_virtqueue *vq,
1303 struct rte_mbuf **pkts,
1304 uint64_t *desc_addrs,
1305 uint64_t *lens)
1306{
1307 bool wrap_counter = vq->avail_wrap_counter;
1308 struct vring_packed_desc *descs = vq->desc_packed;
1309 uint16_t avail_idx = vq->last_avail_idx;
1310 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1311 uint16_t i;
1312
1313 if (unlikely(avail_idx & PACKED_BATCH_MASK))
1314 return -1;
1315
1316 if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
1317 return -1;
1318
1319 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1320 if (unlikely(pkts[i]->next != NULL))
1321 return -1;
1322 if (unlikely(!desc_is_avail(&descs[avail_idx + i],
1323 wrap_counter)))
1324 return -1;
1325 }
1326
1327 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1328 lens[i] = descs[avail_idx + i].len;
1329
1330 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1331 if (unlikely(pkts[i]->pkt_len > (lens[i] - buf_offset)))
1332 return -1;
1333 }
1334
1335 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1336 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
1337 descs[avail_idx + i].addr,
1338 &lens[i],
1339 VHOST_ACCESS_RW);
1340
1341 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1342 if (unlikely(!desc_addrs[i]))
1343 return -1;
1344 if (unlikely(lens[i] != descs[avail_idx + i].len))
1345 return -1;
1346 }
1347
1348 return 0;
1349}
1350
1351static __rte_always_inline void
1352virtio_dev_rx_batch_packed_copy(struct virtio_net *dev,
1353 struct vhost_virtqueue *vq,
1354 struct rte_mbuf **pkts,
1355 uint64_t *desc_addrs,
1356 uint64_t *lens)
1357{
1358 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
1359 struct virtio_net_hdr_mrg_rxbuf *hdrs[PACKED_BATCH_SIZE];
1360 struct vring_packed_desc *descs = vq->desc_packed;
1361 uint16_t avail_idx = vq->last_avail_idx;
1362 uint16_t ids[PACKED_BATCH_SIZE];
1363 uint16_t i;
1364
1365 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1366 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
1367 hdrs[i] = (struct virtio_net_hdr_mrg_rxbuf *)
1368 (uintptr_t)desc_addrs[i];
1369 lens[i] = pkts[i]->pkt_len +
1370 sizeof(struct virtio_net_hdr_mrg_rxbuf);
1371 }
1372
1373 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1374 virtio_enqueue_offload(pkts[i], &hdrs[i]->hdr);
1375
1376 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
1377
1378 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
1379 rte_memcpy((void *)(uintptr_t)(desc_addrs[i] + buf_offset),
1380 rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
1381 pkts[i]->pkt_len);
1382 }
1383
1384 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1385 vhost_log_cache_write_iova(dev, vq, descs[avail_idx + i].addr,
1386 lens[i]);
1387
1388 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
1389 ids[i] = descs[avail_idx + i].id;
1390
1391 vhost_flush_enqueue_batch_packed(dev, vq, lens, ids);
1392}
1393
1394static __rte_always_inline int
1395virtio_dev_rx_sync_batch_packed(struct virtio_net *dev,
1396 struct vhost_virtqueue *vq,
1397 struct rte_mbuf **pkts)
1398{
1399 uint64_t desc_addrs[PACKED_BATCH_SIZE];
1400 uint64_t lens[PACKED_BATCH_SIZE];
1401
1402 if (virtio_dev_rx_sync_batch_check(dev, vq, pkts, desc_addrs, lens) == -1)
1403 return -1;
1404
1405 if (vq->shadow_used_idx) {
1406 do_data_copy_enqueue(dev, vq);
1407 vhost_flush_enqueue_shadow_packed(dev, vq);
1408 }
1409
1410 virtio_dev_rx_batch_packed_copy(dev, vq, pkts, desc_addrs, lens);
1411
1412 return 0;
1413}
1414
1415static __rte_always_inline int16_t
1416virtio_dev_rx_single_packed(struct virtio_net *dev,
1417 struct vhost_virtqueue *vq,
1418 struct rte_mbuf *pkt)
1419{
1420 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1421 uint16_t nr_descs = 0;
1422
1423 if (unlikely(vhost_enqueue_single_packed(dev, vq, pkt, buf_vec,
1424 &nr_descs) < 0)) {
1425 VHOST_LOG_DATA(DEBUG, "(%s) failed to get enough desc from vring\n",
1426 dev->ifname);
1427 return -1;
1428 }
1429
1430 VHOST_LOG_DATA(DEBUG, "(%s) current index %d | end index %d\n",
1431 dev->ifname, vq->last_avail_idx,
1432 vq->last_avail_idx + nr_descs);
1433
1434 vq_inc_last_avail_packed(vq, nr_descs);
1435
1436 return 0;
1437}
1438
1439static __rte_noinline uint32_t
1440virtio_dev_rx_packed(struct virtio_net *dev,
1441 struct vhost_virtqueue *__rte_restrict vq,
1442 struct rte_mbuf **__rte_restrict pkts,
1443 uint32_t count)
1444{
1445 uint32_t pkt_idx = 0;
1446
1447 do {
1448 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
1449
1450 if (count - pkt_idx >= PACKED_BATCH_SIZE) {
1451 if (!virtio_dev_rx_sync_batch_packed(dev, vq,
1452 &pkts[pkt_idx])) {
1453 pkt_idx += PACKED_BATCH_SIZE;
1454 continue;
1455 }
1456 }
1457
1458 if (virtio_dev_rx_single_packed(dev, vq, pkts[pkt_idx]))
1459 break;
1460 pkt_idx++;
1461
1462 } while (pkt_idx < count);
1463
1464 if (vq->shadow_used_idx) {
1465 do_data_copy_enqueue(dev, vq);
1466 vhost_flush_enqueue_shadow_packed(dev, vq);
1467 }
1468
1469 if (pkt_idx)
1470 vhost_vring_call_packed(dev, vq);
1471
1472 return pkt_idx;
1473}
1474
1475static __rte_always_inline uint32_t
1476virtio_dev_rx(struct virtio_net *dev, uint16_t queue_id,
1477 struct rte_mbuf **pkts, uint32_t count)
1478{
1479 struct vhost_virtqueue *vq;
1480 uint32_t nb_tx = 0;
1481
1482 VHOST_LOG_DATA(DEBUG, "(%s) %s\n", dev->ifname, __func__);
1483 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
1484 VHOST_LOG_DATA(ERR, "(%s) %s: invalid virtqueue idx %d.\n",
1485 dev->ifname, __func__, queue_id);
1486 return 0;
1487 }
1488
1489 vq = dev->virtqueue[queue_id];
1490
1491 rte_spinlock_lock(&vq->access_lock);
1492
1493 if (unlikely(!vq->enabled))
1494 goto out_access_unlock;
1495
1496 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1497 vhost_user_iotlb_rd_lock(vq);
1498
1499 if (unlikely(!vq->access_ok))
1500 if (unlikely(vring_translate(dev, vq) < 0))
1501 goto out;
1502
1503 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
1504 if (count == 0)
1505 goto out;
1506
1507 if (vq_is_packed(dev))
1508 nb_tx = virtio_dev_rx_packed(dev, vq, pkts, count);
1509 else
1510 nb_tx = virtio_dev_rx_split(dev, vq, pkts, count);
1511
1512out:
1513 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1514 vhost_user_iotlb_rd_unlock(vq);
1515
1516out_access_unlock:
1517 rte_spinlock_unlock(&vq->access_lock);
1518
1519 return nb_tx;
1520}
1521
1522uint16_t
1523rte_vhost_enqueue_burst(int vid, uint16_t queue_id,
1524 struct rte_mbuf **__rte_restrict pkts, uint16_t count)
1525{
1526 struct virtio_net *dev = get_device(vid);
1527
1528 if (!dev)
1529 return 0;
1530
1531 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
1532 VHOST_LOG_DATA(ERR, "(%s) %s: built-in vhost net backend is disabled.\n",
1533 dev->ifname, __func__);
1534 return 0;
1535 }
1536
1537 return virtio_dev_rx(dev, queue_id, pkts, count);
1538}
1539
1540static __rte_always_inline uint16_t
1541async_get_first_inflight_pkt_idx(struct vhost_virtqueue *vq)
1542{
1543 struct vhost_async *async = vq->async;
1544
1545 if (async->pkts_idx >= async->pkts_inflight_n)
1546 return async->pkts_idx - async->pkts_inflight_n;
1547 else
1548 return vq->size - async->pkts_inflight_n + async->pkts_idx;
1549}
1550
1551static __rte_always_inline void
1552store_dma_desc_info_split(struct vring_used_elem *s_ring, struct vring_used_elem *d_ring,
1553 uint16_t ring_size, uint16_t s_idx, uint16_t d_idx, uint16_t count)
1554{
1555 size_t elem_size = sizeof(struct vring_used_elem);
1556
1557 if (d_idx + count <= ring_size) {
1558 rte_memcpy(d_ring + d_idx, s_ring + s_idx, count * elem_size);
1559 } else {
1560 uint16_t size = ring_size - d_idx;
1561
1562 rte_memcpy(d_ring + d_idx, s_ring + s_idx, size * elem_size);
1563 rte_memcpy(d_ring, s_ring + s_idx + size, (count - size) * elem_size);
1564 }
1565}
1566
1567static __rte_always_inline void
1568store_dma_desc_info_packed(struct vring_used_elem_packed *s_ring,
1569 struct vring_used_elem_packed *d_ring,
1570 uint16_t ring_size, uint16_t s_idx, uint16_t d_idx, uint16_t count)
1571{
1572 size_t elem_size = sizeof(struct vring_used_elem_packed);
1573
1574 if (d_idx + count <= ring_size) {
1575 rte_memcpy(d_ring + d_idx, s_ring + s_idx, count * elem_size);
1576 } else {
1577 uint16_t size = ring_size - d_idx;
1578
1579 rte_memcpy(d_ring + d_idx, s_ring + s_idx, size * elem_size);
1580 rte_memcpy(d_ring, s_ring + s_idx + size, (count - size) * elem_size);
1581 }
1582}
1583
1584static __rte_noinline uint32_t
1585virtio_dev_rx_async_submit_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
1586 uint16_t queue_id, struct rte_mbuf **pkts, uint32_t count,
1587 int16_t dma_id, uint16_t vchan_id)
1588{
1589 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1590 uint32_t pkt_idx = 0;
1591 uint16_t num_buffers;
1592 uint16_t avail_head;
1593
1594 struct vhost_async *async = vq->async;
1595 struct async_inflight_info *pkts_info = async->pkts_info;
1596 uint32_t pkt_err = 0;
1597 uint16_t n_xfer;
1598 uint16_t slot_idx = 0;
1599
1600
1601
1602
1603 avail_head = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE);
1604
1605 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
1606
1607 async_iter_reset(async);
1608
1609 for (pkt_idx = 0; pkt_idx < count; pkt_idx++) {
1610 uint32_t pkt_len = pkts[pkt_idx]->pkt_len + dev->vhost_hlen;
1611 uint16_t nr_vec = 0;
1612
1613 if (unlikely(reserve_avail_buf_split(dev, vq, pkt_len, buf_vec,
1614 &num_buffers, avail_head, &nr_vec) < 0)) {
1615 VHOST_LOG_DATA(DEBUG, "(%s) failed to get enough desc from vring\n",
1616 dev->ifname);
1617 vq->shadow_used_idx -= num_buffers;
1618 break;
1619 }
1620
1621 VHOST_LOG_DATA(DEBUG, "(%s) current index %d | end index %d\n",
1622 dev->ifname, vq->last_avail_idx, vq->last_avail_idx + num_buffers);
1623
1624 if (mbuf_to_desc(dev, vq, pkts[pkt_idx], buf_vec, nr_vec, num_buffers, true) < 0) {
1625 vq->shadow_used_idx -= num_buffers;
1626 break;
1627 }
1628
1629 slot_idx = (async->pkts_idx + pkt_idx) & (vq->size - 1);
1630 pkts_info[slot_idx].descs = num_buffers;
1631 pkts_info[slot_idx].mbuf = pkts[pkt_idx];
1632
1633 vq->last_avail_idx += num_buffers;
1634 }
1635
1636 if (unlikely(pkt_idx == 0))
1637 return 0;
1638
1639 n_xfer = vhost_async_dma_transfer(dev, vq, dma_id, vchan_id, async->pkts_idx,
1640 async->iov_iter, pkt_idx);
1641
1642 pkt_err = pkt_idx - n_xfer;
1643 if (unlikely(pkt_err)) {
1644 uint16_t num_descs = 0;
1645
1646 VHOST_LOG_DATA(DEBUG, "(%s) %s: failed to transfer %u packets for queue %u.\n",
1647 dev->ifname, __func__, pkt_err, queue_id);
1648
1649
1650 pkt_idx = n_xfer;
1651
1652
1653 while (pkt_err-- > 0) {
1654 num_descs += pkts_info[slot_idx & (vq->size - 1)].descs;
1655 slot_idx--;
1656 }
1657
1658
1659 vq->shadow_used_idx -= num_descs;
1660 vq->last_avail_idx -= num_descs;
1661 }
1662
1663
1664 if (likely(vq->shadow_used_idx)) {
1665 uint16_t to = async->desc_idx_split & (vq->size - 1);
1666
1667 store_dma_desc_info_split(vq->shadow_used_split,
1668 async->descs_split, vq->size, 0, to,
1669 vq->shadow_used_idx);
1670
1671 async->desc_idx_split += vq->shadow_used_idx;
1672
1673 async->pkts_idx += pkt_idx;
1674 if (async->pkts_idx >= vq->size)
1675 async->pkts_idx -= vq->size;
1676
1677 async->pkts_inflight_n += pkt_idx;
1678 vq->shadow_used_idx = 0;
1679 }
1680
1681 return pkt_idx;
1682}
1683
1684
1685static __rte_always_inline int
1686vhost_enqueue_async_packed(struct virtio_net *dev,
1687 struct vhost_virtqueue *vq,
1688 struct rte_mbuf *pkt,
1689 struct buf_vector *buf_vec,
1690 uint16_t *nr_descs,
1691 uint16_t *nr_buffers)
1692{
1693 uint16_t nr_vec = 0;
1694 uint16_t avail_idx = vq->last_avail_idx;
1695 uint16_t max_tries, tries = 0;
1696 uint16_t buf_id = 0;
1697 uint32_t len = 0;
1698 uint16_t desc_count = 0;
1699 uint32_t size = pkt->pkt_len + sizeof(struct virtio_net_hdr_mrg_rxbuf);
1700 uint32_t buffer_len[vq->size];
1701 uint16_t buffer_buf_id[vq->size];
1702 uint16_t buffer_desc_count[vq->size];
1703
1704 if (rxvq_is_mergeable(dev))
1705 max_tries = vq->size - 1;
1706 else
1707 max_tries = 1;
1708
1709 while (size > 0) {
1710
1711
1712
1713
1714
1715 if (unlikely(++tries > max_tries))
1716 return -1;
1717
1718 if (unlikely(fill_vec_buf_packed(dev, vq,
1719 avail_idx, &desc_count,
1720 buf_vec, &nr_vec,
1721 &buf_id, &len,
1722 VHOST_ACCESS_RW) < 0))
1723 return -1;
1724
1725 len = RTE_MIN(len, size);
1726 size -= len;
1727
1728 buffer_len[*nr_buffers] = len;
1729 buffer_buf_id[*nr_buffers] = buf_id;
1730 buffer_desc_count[*nr_buffers] = desc_count;
1731 *nr_buffers += 1;
1732 *nr_descs += desc_count;
1733 avail_idx += desc_count;
1734 if (avail_idx >= vq->size)
1735 avail_idx -= vq->size;
1736 }
1737
1738 if (unlikely(mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec, *nr_buffers, true) < 0))
1739 return -1;
1740
1741 vhost_shadow_enqueue_packed(vq, buffer_len, buffer_buf_id, buffer_desc_count, *nr_buffers);
1742
1743 return 0;
1744}
1745
1746static __rte_always_inline int16_t
1747virtio_dev_rx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
1748 struct rte_mbuf *pkt, uint16_t *nr_descs, uint16_t *nr_buffers)
1749{
1750 struct buf_vector buf_vec[BUF_VECTOR_MAX];
1751
1752 if (unlikely(vhost_enqueue_async_packed(dev, vq, pkt, buf_vec,
1753 nr_descs, nr_buffers) < 0)) {
1754 VHOST_LOG_DATA(DEBUG, "(%s) failed to get enough desc from vring\n", dev->ifname);
1755 return -1;
1756 }
1757
1758 VHOST_LOG_DATA(DEBUG, "(%s) current index %d | end index %d\n",
1759 dev->ifname, vq->last_avail_idx, vq->last_avail_idx + *nr_descs);
1760
1761 return 0;
1762}
1763
1764static __rte_always_inline void
1765dma_error_handler_packed(struct vhost_virtqueue *vq, uint16_t slot_idx,
1766 uint32_t nr_err, uint32_t *pkt_idx)
1767{
1768 uint16_t descs_err = 0;
1769 uint16_t buffers_err = 0;
1770 struct async_inflight_info *pkts_info = vq->async->pkts_info;
1771
1772 *pkt_idx -= nr_err;
1773
1774 while (nr_err-- > 0) {
1775 descs_err += pkts_info[slot_idx % vq->size].descs;
1776 buffers_err += pkts_info[slot_idx % vq->size].nr_buffers;
1777 slot_idx--;
1778 }
1779
1780 if (vq->last_avail_idx >= descs_err) {
1781 vq->last_avail_idx -= descs_err;
1782 } else {
1783 vq->last_avail_idx = vq->last_avail_idx + vq->size - descs_err;
1784 vq->avail_wrap_counter ^= 1;
1785 }
1786
1787 vq->shadow_used_idx -= buffers_err;
1788}
1789
1790static __rte_noinline uint32_t
1791virtio_dev_rx_async_submit_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
1792 uint16_t queue_id, struct rte_mbuf **pkts, uint32_t count,
1793 int16_t dma_id, uint16_t vchan_id)
1794{
1795 uint32_t pkt_idx = 0;
1796 uint32_t remained = count;
1797 uint16_t n_xfer;
1798 uint16_t num_buffers;
1799 uint16_t num_descs;
1800
1801 struct vhost_async *async = vq->async;
1802 struct async_inflight_info *pkts_info = async->pkts_info;
1803 uint32_t pkt_err = 0;
1804 uint16_t slot_idx = 0;
1805
1806 do {
1807 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
1808
1809 num_buffers = 0;
1810 num_descs = 0;
1811 if (unlikely(virtio_dev_rx_async_packed(dev, vq, pkts[pkt_idx],
1812 &num_descs, &num_buffers) < 0))
1813 break;
1814
1815 slot_idx = (async->pkts_idx + pkt_idx) % vq->size;
1816
1817 pkts_info[slot_idx].descs = num_descs;
1818 pkts_info[slot_idx].nr_buffers = num_buffers;
1819 pkts_info[slot_idx].mbuf = pkts[pkt_idx];
1820
1821 pkt_idx++;
1822 remained--;
1823 vq_inc_last_avail_packed(vq, num_descs);
1824 } while (pkt_idx < count);
1825
1826 if (unlikely(pkt_idx == 0))
1827 return 0;
1828
1829 n_xfer = vhost_async_dma_transfer(dev, vq, dma_id, vchan_id, async->pkts_idx,
1830 async->iov_iter, pkt_idx);
1831
1832 async_iter_reset(async);
1833
1834 pkt_err = pkt_idx - n_xfer;
1835 if (unlikely(pkt_err)) {
1836 VHOST_LOG_DATA(DEBUG, "(%s) %s: failed to transfer %u packets for queue %u.\n",
1837 dev->ifname, __func__, pkt_err, queue_id);
1838 dma_error_handler_packed(vq, slot_idx, pkt_err, &pkt_idx);
1839 }
1840
1841 if (likely(vq->shadow_used_idx)) {
1842
1843 store_dma_desc_info_packed(vq->shadow_used_packed, async->buffers_packed,
1844 vq->size, 0, async->buffer_idx_packed,
1845 vq->shadow_used_idx);
1846
1847 async->buffer_idx_packed += vq->shadow_used_idx;
1848 if (async->buffer_idx_packed >= vq->size)
1849 async->buffer_idx_packed -= vq->size;
1850
1851 async->pkts_idx += pkt_idx;
1852 if (async->pkts_idx >= vq->size)
1853 async->pkts_idx -= vq->size;
1854
1855 vq->shadow_used_idx = 0;
1856 async->pkts_inflight_n += pkt_idx;
1857 }
1858
1859 return pkt_idx;
1860}
1861
1862static __rte_always_inline void
1863write_back_completed_descs_split(struct vhost_virtqueue *vq, uint16_t n_descs)
1864{
1865 struct vhost_async *async = vq->async;
1866 uint16_t nr_left = n_descs;
1867 uint16_t nr_copy;
1868 uint16_t to, from;
1869
1870 do {
1871 from = async->last_desc_idx_split & (vq->size - 1);
1872 nr_copy = nr_left + from <= vq->size ? nr_left : vq->size - from;
1873 to = vq->last_used_idx & (vq->size - 1);
1874
1875 if (to + nr_copy <= vq->size) {
1876 rte_memcpy(&vq->used->ring[to], &async->descs_split[from],
1877 nr_copy * sizeof(struct vring_used_elem));
1878 } else {
1879 uint16_t size = vq->size - to;
1880
1881 rte_memcpy(&vq->used->ring[to], &async->descs_split[from],
1882 size * sizeof(struct vring_used_elem));
1883 rte_memcpy(&vq->used->ring[0], &async->descs_split[from + size],
1884 (nr_copy - size) * sizeof(struct vring_used_elem));
1885 }
1886
1887 async->last_desc_idx_split += nr_copy;
1888 vq->last_used_idx += nr_copy;
1889 nr_left -= nr_copy;
1890 } while (nr_left > 0);
1891}
1892
1893static __rte_always_inline void
1894write_back_completed_descs_packed(struct vhost_virtqueue *vq,
1895 uint16_t n_buffers)
1896{
1897 struct vhost_async *async = vq->async;
1898 uint16_t from = async->last_buffer_idx_packed;
1899 uint16_t used_idx = vq->last_used_idx;
1900 uint16_t head_idx = vq->last_used_idx;
1901 uint16_t head_flags = 0;
1902 uint16_t i;
1903
1904
1905 for (i = 0; i < n_buffers; i++) {
1906 vq->desc_packed[used_idx].id = async->buffers_packed[from].id;
1907 vq->desc_packed[used_idx].len = async->buffers_packed[from].len;
1908
1909 used_idx += async->buffers_packed[from].count;
1910 if (used_idx >= vq->size)
1911 used_idx -= vq->size;
1912
1913 from++;
1914 if (from >= vq->size)
1915 from = 0;
1916 }
1917
1918
1919 rte_atomic_thread_fence(__ATOMIC_RELEASE);
1920
1921 from = async->last_buffer_idx_packed;
1922
1923 for (i = 0; i < n_buffers; i++) {
1924 uint16_t flags;
1925
1926 if (async->buffers_packed[from].len)
1927 flags = VRING_DESC_F_WRITE;
1928 else
1929 flags = 0;
1930
1931 if (vq->used_wrap_counter) {
1932 flags |= VRING_DESC_F_USED;
1933 flags |= VRING_DESC_F_AVAIL;
1934 } else {
1935 flags &= ~VRING_DESC_F_USED;
1936 flags &= ~VRING_DESC_F_AVAIL;
1937 }
1938
1939 if (i > 0) {
1940 vq->desc_packed[vq->last_used_idx].flags = flags;
1941 } else {
1942 head_idx = vq->last_used_idx;
1943 head_flags = flags;
1944 }
1945
1946 vq_inc_last_used_packed(vq, async->buffers_packed[from].count);
1947
1948 from++;
1949 if (from == vq->size)
1950 from = 0;
1951 }
1952
1953 vq->desc_packed[head_idx].flags = head_flags;
1954 async->last_buffer_idx_packed = from;
1955}
1956
1957static __rte_always_inline uint16_t
1958vhost_poll_enqueue_completed(struct virtio_net *dev, uint16_t queue_id,
1959 struct rte_mbuf **pkts, uint16_t count, int16_t dma_id,
1960 uint16_t vchan_id)
1961{
1962 struct vhost_virtqueue *vq = dev->virtqueue[queue_id];
1963 struct vhost_async *async = vq->async;
1964 struct async_inflight_info *pkts_info = async->pkts_info;
1965 uint16_t nr_cpl_pkts = 0;
1966 uint16_t n_descs = 0, n_buffers = 0;
1967 uint16_t start_idx, from, i;
1968
1969
1970 vhost_async_dma_check_completed(dev, dma_id, vchan_id, VHOST_DMA_MAX_COPY_COMPLETE);
1971
1972 start_idx = async_get_first_inflight_pkt_idx(vq);
1973
1974
1975
1976
1977
1978
1979
1980 from = start_idx;
1981 while (vq->async->pkts_cmpl_flag[from] && count--) {
1982 vq->async->pkts_cmpl_flag[from] = false;
1983 from++;
1984 if (from >= vq->size)
1985 from -= vq->size;
1986 nr_cpl_pkts++;
1987 }
1988
1989 if (nr_cpl_pkts == 0)
1990 return 0;
1991
1992 for (i = 0; i < nr_cpl_pkts; i++) {
1993 from = (start_idx + i) % vq->size;
1994
1995 n_buffers += pkts_info[from].nr_buffers;
1996
1997 n_descs += pkts_info[from].descs;
1998 pkts[i] = pkts_info[from].mbuf;
1999 }
2000
2001 async->pkts_inflight_n -= nr_cpl_pkts;
2002
2003 if (likely(vq->enabled && vq->access_ok)) {
2004 if (vq_is_packed(dev)) {
2005 write_back_completed_descs_packed(vq, n_buffers);
2006 vhost_vring_call_packed(dev, vq);
2007 } else {
2008 write_back_completed_descs_split(vq, n_descs);
2009 __atomic_add_fetch(&vq->used->idx, n_descs, __ATOMIC_RELEASE);
2010 vhost_vring_call_split(dev, vq);
2011 }
2012 } else {
2013 if (vq_is_packed(dev)) {
2014 async->last_buffer_idx_packed += n_buffers;
2015 if (async->last_buffer_idx_packed >= vq->size)
2016 async->last_buffer_idx_packed -= vq->size;
2017 } else {
2018 async->last_desc_idx_split += n_descs;
2019 }
2020 }
2021
2022 return nr_cpl_pkts;
2023}
2024
2025uint16_t
2026rte_vhost_poll_enqueue_completed(int vid, uint16_t queue_id,
2027 struct rte_mbuf **pkts, uint16_t count, int16_t dma_id,
2028 uint16_t vchan_id)
2029{
2030 struct virtio_net *dev = get_device(vid);
2031 struct vhost_virtqueue *vq;
2032 uint16_t n_pkts_cpl = 0;
2033
2034 if (unlikely(!dev))
2035 return 0;
2036
2037 VHOST_LOG_DATA(DEBUG, "(%s) %s\n", dev->ifname, __func__);
2038 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
2039 VHOST_LOG_DATA(ERR, "(%s) %s: invalid virtqueue idx %d.\n",
2040 dev->ifname, __func__, queue_id);
2041 return 0;
2042 }
2043
2044 if (unlikely(!dma_copy_track[dma_id].vchans ||
2045 !dma_copy_track[dma_id].vchans[vchan_id].pkts_cmpl_flag_addr)) {
2046 VHOST_LOG_DATA(ERR, "(%s) %s: invalid channel %d:%u.\n", dev->ifname, __func__,
2047 dma_id, vchan_id);
2048 return 0;
2049 }
2050
2051 vq = dev->virtqueue[queue_id];
2052
2053 if (!rte_spinlock_trylock(&vq->access_lock)) {
2054 VHOST_LOG_DATA(DEBUG, "(%s) %s: virtqueue %u is busy.\n", dev->ifname, __func__,
2055 queue_id);
2056 return 0;
2057 }
2058
2059 if (unlikely(!vq->async)) {
2060 VHOST_LOG_DATA(ERR, "(%s) %s: async not registered for virtqueue %d.\n",
2061 dev->ifname, __func__, queue_id);
2062 goto out;
2063 }
2064
2065 n_pkts_cpl = vhost_poll_enqueue_completed(dev, queue_id, pkts, count, dma_id, vchan_id);
2066
2067out:
2068 rte_spinlock_unlock(&vq->access_lock);
2069
2070 return n_pkts_cpl;
2071}
2072
2073uint16_t
2074rte_vhost_clear_queue_thread_unsafe(int vid, uint16_t queue_id,
2075 struct rte_mbuf **pkts, uint16_t count, int16_t dma_id,
2076 uint16_t vchan_id)
2077{
2078 struct virtio_net *dev = get_device(vid);
2079 struct vhost_virtqueue *vq;
2080 uint16_t n_pkts_cpl = 0;
2081
2082 if (!dev)
2083 return 0;
2084
2085 VHOST_LOG_DATA(DEBUG, "(%s) %s\n", dev->ifname, __func__);
2086 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
2087 VHOST_LOG_DATA(ERR, "(%s) %s: invalid virtqueue idx %d.\n",
2088 dev->ifname, __func__, queue_id);
2089 return 0;
2090 }
2091
2092 vq = dev->virtqueue[queue_id];
2093
2094 if (unlikely(!vq->async)) {
2095 VHOST_LOG_DATA(ERR, "(%s) %s: async not registered for queue id %d.\n",
2096 dev->ifname, __func__, queue_id);
2097 return 0;
2098 }
2099
2100 if (unlikely(!dma_copy_track[dma_id].vchans ||
2101 !dma_copy_track[dma_id].vchans[vchan_id].pkts_cmpl_flag_addr)) {
2102 VHOST_LOG_DATA(ERR, "(%s) %s: invalid channel %d:%u.\n", dev->ifname, __func__,
2103 dma_id, vchan_id);
2104 return 0;
2105 }
2106
2107 n_pkts_cpl = vhost_poll_enqueue_completed(dev, queue_id, pkts, count, dma_id, vchan_id);
2108
2109 return n_pkts_cpl;
2110}
2111
2112static __rte_always_inline uint32_t
2113virtio_dev_rx_async_submit(struct virtio_net *dev, uint16_t queue_id,
2114 struct rte_mbuf **pkts, uint32_t count, int16_t dma_id, uint16_t vchan_id)
2115{
2116 struct vhost_virtqueue *vq;
2117 uint32_t nb_tx = 0;
2118
2119 VHOST_LOG_DATA(DEBUG, "(%s) %s\n", dev->ifname, __func__);
2120 if (unlikely(!is_valid_virt_queue_idx(queue_id, 0, dev->nr_vring))) {
2121 VHOST_LOG_DATA(ERR, "(%s) %s: invalid virtqueue idx %d.\n",
2122 dev->ifname, __func__, queue_id);
2123 return 0;
2124 }
2125
2126 if (unlikely(!dma_copy_track[dma_id].vchans ||
2127 !dma_copy_track[dma_id].vchans[vchan_id].pkts_cmpl_flag_addr)) {
2128 VHOST_LOG_DATA(ERR, "(%s) %s: invalid channel %d:%u.\n", dev->ifname, __func__,
2129 dma_id, vchan_id);
2130 return 0;
2131 }
2132
2133 vq = dev->virtqueue[queue_id];
2134
2135 rte_spinlock_lock(&vq->access_lock);
2136
2137 if (unlikely(!vq->enabled || !vq->async))
2138 goto out_access_unlock;
2139
2140 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2141 vhost_user_iotlb_rd_lock(vq);
2142
2143 if (unlikely(!vq->access_ok))
2144 if (unlikely(vring_translate(dev, vq) < 0))
2145 goto out;
2146
2147 count = RTE_MIN((uint32_t)MAX_PKT_BURST, count);
2148 if (count == 0)
2149 goto out;
2150
2151 if (vq_is_packed(dev))
2152 nb_tx = virtio_dev_rx_async_submit_packed(dev, vq, queue_id,
2153 pkts, count, dma_id, vchan_id);
2154 else
2155 nb_tx = virtio_dev_rx_async_submit_split(dev, vq, queue_id,
2156 pkts, count, dma_id, vchan_id);
2157
2158out:
2159 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
2160 vhost_user_iotlb_rd_unlock(vq);
2161
2162out_access_unlock:
2163 rte_spinlock_unlock(&vq->access_lock);
2164
2165 return nb_tx;
2166}
2167
2168uint16_t
2169rte_vhost_submit_enqueue_burst(int vid, uint16_t queue_id,
2170 struct rte_mbuf **pkts, uint16_t count, int16_t dma_id,
2171 uint16_t vchan_id)
2172{
2173 struct virtio_net *dev = get_device(vid);
2174
2175 if (!dev)
2176 return 0;
2177
2178 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
2179 VHOST_LOG_DATA(ERR, "(%s) %s: built-in vhost net backend is disabled.\n",
2180 dev->ifname, __func__);
2181 return 0;
2182 }
2183
2184 return virtio_dev_rx_async_submit(dev, queue_id, pkts, count, dma_id, vchan_id);
2185}
2186
2187static inline bool
2188virtio_net_with_host_offload(struct virtio_net *dev)
2189{
2190 if (dev->features &
2191 ((1ULL << VIRTIO_NET_F_CSUM) |
2192 (1ULL << VIRTIO_NET_F_HOST_ECN) |
2193 (1ULL << VIRTIO_NET_F_HOST_TSO4) |
2194 (1ULL << VIRTIO_NET_F_HOST_TSO6) |
2195 (1ULL << VIRTIO_NET_F_HOST_UFO)))
2196 return true;
2197
2198 return false;
2199}
2200
2201static int
2202parse_headers(struct rte_mbuf *m, uint8_t *l4_proto)
2203{
2204 struct rte_ipv4_hdr *ipv4_hdr;
2205 struct rte_ipv6_hdr *ipv6_hdr;
2206 struct rte_ether_hdr *eth_hdr;
2207 uint16_t ethertype;
2208 uint16_t data_len = rte_pktmbuf_data_len(m);
2209
2210 if (data_len < sizeof(struct rte_ether_hdr))
2211 return -EINVAL;
2212
2213 eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
2214
2215 m->l2_len = sizeof(struct rte_ether_hdr);
2216 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
2217
2218 if (ethertype == RTE_ETHER_TYPE_VLAN) {
2219 if (data_len < sizeof(struct rte_ether_hdr) +
2220 sizeof(struct rte_vlan_hdr))
2221 goto error;
2222
2223 struct rte_vlan_hdr *vlan_hdr =
2224 (struct rte_vlan_hdr *)(eth_hdr + 1);
2225
2226 m->l2_len += sizeof(struct rte_vlan_hdr);
2227 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
2228 }
2229
2230 switch (ethertype) {
2231 case RTE_ETHER_TYPE_IPV4:
2232 if (data_len < m->l2_len + sizeof(struct rte_ipv4_hdr))
2233 goto error;
2234 ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv4_hdr *,
2235 m->l2_len);
2236 m->l3_len = rte_ipv4_hdr_len(ipv4_hdr);
2237 if (data_len < m->l2_len + m->l3_len)
2238 goto error;
2239 m->ol_flags |= RTE_MBUF_F_TX_IPV4;
2240 *l4_proto = ipv4_hdr->next_proto_id;
2241 break;
2242 case RTE_ETHER_TYPE_IPV6:
2243 if (data_len < m->l2_len + sizeof(struct rte_ipv6_hdr))
2244 goto error;
2245 ipv6_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv6_hdr *,
2246 m->l2_len);
2247 m->l3_len = sizeof(struct rte_ipv6_hdr);
2248 m->ol_flags |= RTE_MBUF_F_TX_IPV6;
2249 *l4_proto = ipv6_hdr->proto;
2250 break;
2251 default:
2252
2253 goto error;
2254 }
2255
2256
2257 switch (*l4_proto) {
2258 case IPPROTO_TCP:
2259 if (data_len < m->l2_len + m->l3_len +
2260 sizeof(struct rte_tcp_hdr))
2261 goto error;
2262 break;
2263 case IPPROTO_UDP:
2264 if (data_len < m->l2_len + m->l3_len +
2265 sizeof(struct rte_udp_hdr))
2266 goto error;
2267 break;
2268 case IPPROTO_SCTP:
2269 if (data_len < m->l2_len + m->l3_len +
2270 sizeof(struct rte_sctp_hdr))
2271 goto error;
2272 break;
2273 default:
2274 goto error;
2275 }
2276
2277 return 0;
2278
2279error:
2280 m->l2_len = 0;
2281 m->l3_len = 0;
2282 m->ol_flags = 0;
2283 return -EINVAL;
2284}
2285
2286static __rte_always_inline void
2287vhost_dequeue_offload_legacy(struct virtio_net *dev, struct virtio_net_hdr *hdr,
2288 struct rte_mbuf *m)
2289{
2290 uint8_t l4_proto = 0;
2291 struct rte_tcp_hdr *tcp_hdr = NULL;
2292 uint16_t tcp_len;
2293 uint16_t data_len = rte_pktmbuf_data_len(m);
2294
2295 if (parse_headers(m, &l4_proto) < 0)
2296 return;
2297
2298 if (hdr->flags == VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2299 if (hdr->csum_start == (m->l2_len + m->l3_len)) {
2300 switch (hdr->csum_offset) {
2301 case (offsetof(struct rte_tcp_hdr, cksum)):
2302 if (l4_proto != IPPROTO_TCP)
2303 goto error;
2304 m->ol_flags |= RTE_MBUF_F_TX_TCP_CKSUM;
2305 break;
2306 case (offsetof(struct rte_udp_hdr, dgram_cksum)):
2307 if (l4_proto != IPPROTO_UDP)
2308 goto error;
2309 m->ol_flags |= RTE_MBUF_F_TX_UDP_CKSUM;
2310 break;
2311 case (offsetof(struct rte_sctp_hdr, cksum)):
2312 if (l4_proto != IPPROTO_SCTP)
2313 goto error;
2314 m->ol_flags |= RTE_MBUF_F_TX_SCTP_CKSUM;
2315 break;
2316 default:
2317 goto error;
2318 }
2319 } else {
2320 goto error;
2321 }
2322 }
2323
2324 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2325 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2326 case VIRTIO_NET_HDR_GSO_TCPV4:
2327 case VIRTIO_NET_HDR_GSO_TCPV6:
2328 if (l4_proto != IPPROTO_TCP)
2329 goto error;
2330 tcp_hdr = rte_pktmbuf_mtod_offset(m,
2331 struct rte_tcp_hdr *,
2332 m->l2_len + m->l3_len);
2333 tcp_len = (tcp_hdr->data_off & 0xf0) >> 2;
2334 if (data_len < m->l2_len + m->l3_len + tcp_len)
2335 goto error;
2336 m->ol_flags |= RTE_MBUF_F_TX_TCP_SEG;
2337 m->tso_segsz = hdr->gso_size;
2338 m->l4_len = tcp_len;
2339 break;
2340 case VIRTIO_NET_HDR_GSO_UDP:
2341 if (l4_proto != IPPROTO_UDP)
2342 goto error;
2343 m->ol_flags |= RTE_MBUF_F_TX_UDP_SEG;
2344 m->tso_segsz = hdr->gso_size;
2345 m->l4_len = sizeof(struct rte_udp_hdr);
2346 break;
2347 default:
2348 VHOST_LOG_DATA(WARNING, "(%s) unsupported gso type %u.\n",
2349 dev->ifname, hdr->gso_type);
2350 goto error;
2351 }
2352 }
2353 return;
2354
2355error:
2356 m->l2_len = 0;
2357 m->l3_len = 0;
2358 m->ol_flags = 0;
2359}
2360
2361static __rte_always_inline void
2362vhost_dequeue_offload(struct virtio_net *dev, struct virtio_net_hdr *hdr,
2363 struct rte_mbuf *m, bool legacy_ol_flags)
2364{
2365 struct rte_net_hdr_lens hdr_lens;
2366 int l4_supported = 0;
2367 uint32_t ptype;
2368
2369 if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
2370 return;
2371
2372 if (legacy_ol_flags) {
2373 vhost_dequeue_offload_legacy(dev, hdr, m);
2374 return;
2375 }
2376
2377 m->ol_flags |= RTE_MBUF_F_RX_IP_CKSUM_UNKNOWN;
2378
2379 ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
2380 m->packet_type = ptype;
2381 if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
2382 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
2383 (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
2384 l4_supported = 1;
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399 if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
2400 uint32_t hdrlen;
2401
2402 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
2403 if (hdr->csum_start <= hdrlen && l4_supported != 0) {
2404 m->ol_flags |= RTE_MBUF_F_RX_L4_CKSUM_NONE;
2405 } else {
2406
2407
2408
2409
2410
2411
2412 uint16_t csum = 0, off;
2413
2414 if (rte_raw_cksum_mbuf(m, hdr->csum_start,
2415 rte_pktmbuf_pkt_len(m) - hdr->csum_start, &csum) < 0)
2416 return;
2417 if (likely(csum != 0xffff))
2418 csum = ~csum;
2419 off = hdr->csum_offset + hdr->csum_start;
2420 if (rte_pktmbuf_data_len(m) >= off + 1)
2421 *rte_pktmbuf_mtod_offset(m, uint16_t *, off) = csum;
2422 }
2423 }
2424
2425 if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
2426 if (hdr->gso_size == 0)
2427 return;
2428
2429 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
2430 case VIRTIO_NET_HDR_GSO_TCPV4:
2431 case VIRTIO_NET_HDR_GSO_TCPV6:
2432 if ((ptype & RTE_PTYPE_L4_MASK) != RTE_PTYPE_L4_TCP)
2433 break;
2434 m->ol_flags |= RTE_MBUF_F_RX_LRO | RTE_MBUF_F_RX_L4_CKSUM_NONE;
2435 m->tso_segsz = hdr->gso_size;
2436 break;
2437 case VIRTIO_NET_HDR_GSO_UDP:
2438 if ((ptype & RTE_PTYPE_L4_MASK) != RTE_PTYPE_L4_UDP)
2439 break;
2440 m->ol_flags |= RTE_MBUF_F_RX_LRO | RTE_MBUF_F_RX_L4_CKSUM_NONE;
2441 m->tso_segsz = hdr->gso_size;
2442 break;
2443 default:
2444 break;
2445 }
2446 }
2447}
2448
2449static __rte_noinline void
2450copy_vnet_hdr_from_desc(struct virtio_net_hdr *hdr,
2451 struct buf_vector *buf_vec)
2452{
2453 uint64_t len;
2454 uint64_t remain = sizeof(struct virtio_net_hdr);
2455 uint64_t src;
2456 uint64_t dst = (uint64_t)(uintptr_t)hdr;
2457
2458 while (remain) {
2459 len = RTE_MIN(remain, buf_vec->buf_len);
2460 src = buf_vec->buf_addr;
2461 rte_memcpy((void *)(uintptr_t)dst,
2462 (void *)(uintptr_t)src, len);
2463
2464 remain -= len;
2465 dst += len;
2466 buf_vec++;
2467 }
2468}
2469
2470static __rte_always_inline int
2471copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
2472 struct buf_vector *buf_vec, uint16_t nr_vec,
2473 struct rte_mbuf *m, struct rte_mempool *mbuf_pool,
2474 bool legacy_ol_flags)
2475{
2476 uint32_t buf_avail, buf_offset;
2477 uint64_t buf_addr, buf_len;
2478 uint32_t mbuf_avail, mbuf_offset;
2479 uint32_t cpy_len;
2480 struct rte_mbuf *cur = m, *prev = m;
2481 struct virtio_net_hdr tmp_hdr;
2482 struct virtio_net_hdr *hdr = NULL;
2483
2484 uint16_t vec_idx = 0;
2485 struct batch_copy_elem *batch_copy = vq->batch_copy_elems;
2486 int error = 0;
2487
2488 buf_addr = buf_vec[vec_idx].buf_addr;
2489 buf_len = buf_vec[vec_idx].buf_len;
2490
2491 if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
2492 error = -1;
2493 goto out;
2494 }
2495
2496 if (virtio_net_with_host_offload(dev)) {
2497 if (unlikely(buf_len < sizeof(struct virtio_net_hdr))) {
2498
2499
2500
2501
2502 copy_vnet_hdr_from_desc(&tmp_hdr, buf_vec);
2503 hdr = &tmp_hdr;
2504 } else {
2505 hdr = (struct virtio_net_hdr *)((uintptr_t)buf_addr);
2506 }
2507 }
2508
2509
2510
2511
2512
2513
2514 if (unlikely(buf_len < dev->vhost_hlen)) {
2515 buf_offset = dev->vhost_hlen - buf_len;
2516 vec_idx++;
2517 buf_addr = buf_vec[vec_idx].buf_addr;
2518 buf_len = buf_vec[vec_idx].buf_len;
2519 buf_avail = buf_len - buf_offset;
2520 } else if (buf_len == dev->vhost_hlen) {
2521 if (unlikely(++vec_idx >= nr_vec))
2522 goto out;
2523 buf_addr = buf_vec[vec_idx].buf_addr;
2524 buf_len = buf_vec[vec_idx].buf_len;
2525
2526 buf_offset = 0;
2527 buf_avail = buf_len;
2528 } else {
2529 buf_offset = dev->vhost_hlen;
2530 buf_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen;
2531 }
2532
2533 PRINT_PACKET(dev,
2534 (uintptr_t)(buf_addr + buf_offset),
2535 (uint32_t)buf_avail, 0);
2536
2537 mbuf_offset = 0;
2538 mbuf_avail = m->buf_len - RTE_PKTMBUF_HEADROOM;
2539 while (1) {
2540 cpy_len = RTE_MIN(buf_avail, mbuf_avail);
2541
2542 if (likely(cpy_len > MAX_BATCH_LEN ||
2543 vq->batch_copy_nb_elems >= vq->size ||
2544 (hdr && cur == m))) {
2545 rte_memcpy(rte_pktmbuf_mtod_offset(cur, void *,
2546 mbuf_offset),
2547 (void *)((uintptr_t)(buf_addr +
2548 buf_offset)), cpy_len);
2549 } else {
2550 batch_copy[vq->batch_copy_nb_elems].dst =
2551 rte_pktmbuf_mtod_offset(cur, void *,
2552 mbuf_offset);
2553 batch_copy[vq->batch_copy_nb_elems].src =
2554 (void *)((uintptr_t)(buf_addr + buf_offset));
2555 batch_copy[vq->batch_copy_nb_elems].len = cpy_len;
2556 vq->batch_copy_nb_elems++;
2557 }
2558
2559 mbuf_avail -= cpy_len;
2560 mbuf_offset += cpy_len;
2561 buf_avail -= cpy_len;
2562 buf_offset += cpy_len;
2563
2564
2565 if (buf_avail == 0) {
2566 if (++vec_idx >= nr_vec)
2567 break;
2568
2569 buf_addr = buf_vec[vec_idx].buf_addr;
2570 buf_len = buf_vec[vec_idx].buf_len;
2571
2572 buf_offset = 0;
2573 buf_avail = buf_len;
2574
2575 PRINT_PACKET(dev, (uintptr_t)buf_addr,
2576 (uint32_t)buf_avail, 0);
2577 }
2578
2579
2580
2581
2582
2583 if (mbuf_avail == 0) {
2584 cur = rte_pktmbuf_alloc(mbuf_pool);
2585 if (unlikely(cur == NULL)) {
2586 VHOST_LOG_DATA(ERR, "(%s) failed to allocate memory for mbuf.\n",
2587 dev->ifname);
2588 error = -1;
2589 goto out;
2590 }
2591
2592 prev->next = cur;
2593 prev->data_len = mbuf_offset;
2594 m->nb_segs += 1;
2595 m->pkt_len += mbuf_offset;
2596 prev = cur;
2597
2598 mbuf_offset = 0;
2599 mbuf_avail = cur->buf_len - RTE_PKTMBUF_HEADROOM;
2600 }
2601 }
2602
2603 prev->data_len = mbuf_offset;
2604 m->pkt_len += mbuf_offset;
2605
2606 if (hdr)
2607 vhost_dequeue_offload(dev, hdr, m, legacy_ol_flags);
2608
2609out:
2610
2611 return error;
2612}
2613
2614static void
2615virtio_dev_extbuf_free(void *addr __rte_unused, void *opaque)
2616{
2617 rte_free(opaque);
2618}
2619
2620static int
2621virtio_dev_extbuf_alloc(struct virtio_net *dev, struct rte_mbuf *pkt, uint32_t size)
2622{
2623 struct rte_mbuf_ext_shared_info *shinfo = NULL;
2624 uint32_t total_len = RTE_PKTMBUF_HEADROOM + size;
2625 uint16_t buf_len;
2626 rte_iova_t iova;
2627 void *buf;
2628
2629 total_len += sizeof(*shinfo) + sizeof(uintptr_t);
2630 total_len = RTE_ALIGN_CEIL(total_len, sizeof(uintptr_t));
2631
2632 if (unlikely(total_len > UINT16_MAX))
2633 return -ENOSPC;
2634
2635 buf_len = total_len;
2636 buf = rte_malloc(NULL, buf_len, RTE_CACHE_LINE_SIZE);
2637 if (unlikely(buf == NULL))
2638 return -ENOMEM;
2639
2640
2641 shinfo = rte_pktmbuf_ext_shinfo_init_helper(buf, &buf_len,
2642 virtio_dev_extbuf_free, buf);
2643 if (unlikely(shinfo == NULL)) {
2644 rte_free(buf);
2645 VHOST_LOG_DATA(ERR, "(%s) failed to init shinfo\n", dev->ifname);
2646 return -1;
2647 }
2648
2649 iova = rte_malloc_virt2iova(buf);
2650 rte_pktmbuf_attach_extbuf(pkt, buf, iova, buf_len, shinfo);
2651 rte_pktmbuf_reset_headroom(pkt);
2652
2653 return 0;
2654}
2655
2656
2657
2658
2659static __rte_always_inline int
2660virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
2661 uint32_t data_len)
2662{
2663 if (rte_pktmbuf_tailroom(pkt) >= data_len)
2664 return 0;
2665
2666
2667 if (dev->extbuf && !virtio_dev_extbuf_alloc(dev, pkt, data_len))
2668 return 0;
2669
2670
2671 if (!dev->linearbuf)
2672 return 0;
2673
2674 return -1;
2675}
2676
2677__rte_always_inline
2678static uint16_t
2679virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
2680 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count,
2681 bool legacy_ol_flags)
2682{
2683 uint16_t i;
2684 uint16_t free_entries;
2685 uint16_t dropped = 0;
2686 static bool allocerr_warned;
2687
2688
2689
2690
2691
2692 free_entries = __atomic_load_n(&vq->avail->idx, __ATOMIC_ACQUIRE) -
2693 vq->last_avail_idx;
2694 if (free_entries == 0)
2695 return 0;
2696
2697 rte_prefetch0(&vq->avail->ring[vq->last_avail_idx & (vq->size - 1)]);
2698
2699 VHOST_LOG_DATA(DEBUG, "(%s) %s\n", dev->ifname, __func__);
2700
2701 count = RTE_MIN(count, MAX_PKT_BURST);
2702 count = RTE_MIN(count, free_entries);
2703 VHOST_LOG_DATA(DEBUG, "(%s) about to dequeue %u buffers\n",
2704 dev->ifname, count);
2705
2706 if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
2707 return 0;
2708
2709 for (i = 0; i < count; i++) {
2710 struct buf_vector buf_vec[BUF_VECTOR_MAX];
2711 uint16_t head_idx;
2712 uint32_t buf_len;
2713 uint16_t nr_vec = 0;
2714 int err;
2715
2716 if (unlikely(fill_vec_buf_split(dev, vq,
2717 vq->last_avail_idx + i,
2718 &nr_vec, buf_vec,
2719 &head_idx, &buf_len,
2720 VHOST_ACCESS_RO) < 0))
2721 break;
2722
2723 update_shadow_used_ring_split(vq, head_idx, 0);
2724
2725 err = virtio_dev_pktmbuf_prep(dev, pkts[i], buf_len);
2726 if (unlikely(err)) {
2727
2728
2729
2730
2731
2732 if (!allocerr_warned) {
2733 VHOST_LOG_DATA(ERR, "(%s) failed mbuf alloc of size %d from %s.\n",
2734 dev->ifname, buf_len, mbuf_pool->name);
2735 allocerr_warned = true;
2736 }
2737 dropped += 1;
2738 i++;
2739 break;
2740 }
2741
2742 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts[i],
2743 mbuf_pool, legacy_ol_flags);
2744 if (unlikely(err)) {
2745 if (!allocerr_warned) {
2746 VHOST_LOG_DATA(ERR, "(%s) failed to copy desc to mbuf.\n",
2747 dev->ifname);
2748 allocerr_warned = true;
2749 }
2750 dropped += 1;
2751 i++;
2752 break;
2753 }
2754 }
2755
2756 if (dropped)
2757 rte_pktmbuf_free_bulk(&pkts[i - 1], count - i + 1);
2758
2759 vq->last_avail_idx += i;
2760
2761 do_data_copy_dequeue(vq);
2762 if (unlikely(i < count))
2763 vq->shadow_used_idx = i;
2764 if (likely(vq->shadow_used_idx)) {
2765 flush_shadow_used_ring_split(dev, vq);
2766 vhost_vring_call_split(dev, vq);
2767 }
2768
2769 return (i - dropped);
2770}
2771
2772__rte_noinline
2773static uint16_t
2774virtio_dev_tx_split_legacy(struct virtio_net *dev,
2775 struct vhost_virtqueue *vq, struct rte_mempool *mbuf_pool,
2776 struct rte_mbuf **pkts, uint16_t count)
2777{
2778 return virtio_dev_tx_split(dev, vq, mbuf_pool, pkts, count, true);
2779}
2780
2781__rte_noinline
2782static uint16_t
2783virtio_dev_tx_split_compliant(struct virtio_net *dev,
2784 struct vhost_virtqueue *vq, struct rte_mempool *mbuf_pool,
2785 struct rte_mbuf **pkts, uint16_t count)
2786{
2787 return virtio_dev_tx_split(dev, vq, mbuf_pool, pkts, count, false);
2788}
2789
2790static __rte_always_inline int
2791vhost_reserve_avail_batch_packed(struct virtio_net *dev,
2792 struct vhost_virtqueue *vq,
2793 struct rte_mbuf **pkts,
2794 uint16_t avail_idx,
2795 uintptr_t *desc_addrs,
2796 uint16_t *ids)
2797{
2798 bool wrap = vq->avail_wrap_counter;
2799 struct vring_packed_desc *descs = vq->desc_packed;
2800 uint64_t lens[PACKED_BATCH_SIZE];
2801 uint64_t buf_lens[PACKED_BATCH_SIZE];
2802 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2803 uint16_t flags, i;
2804
2805 if (unlikely(avail_idx & PACKED_BATCH_MASK))
2806 return -1;
2807 if (unlikely((avail_idx + PACKED_BATCH_SIZE) > vq->size))
2808 return -1;
2809
2810 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2811 flags = descs[avail_idx + i].flags;
2812 if (unlikely((wrap != !!(flags & VRING_DESC_F_AVAIL)) ||
2813 (wrap == !!(flags & VRING_DESC_F_USED)) ||
2814 (flags & PACKED_DESC_SINGLE_DEQUEUE_FLAG)))
2815 return -1;
2816 }
2817
2818 rte_atomic_thread_fence(__ATOMIC_ACQUIRE);
2819
2820 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2821 lens[i] = descs[avail_idx + i].len;
2822
2823 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2824 desc_addrs[i] = vhost_iova_to_vva(dev, vq,
2825 descs[avail_idx + i].addr,
2826 &lens[i], VHOST_ACCESS_RW);
2827 }
2828
2829 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2830 if (unlikely(!desc_addrs[i]))
2831 return -1;
2832 if (unlikely((lens[i] != descs[avail_idx + i].len)))
2833 return -1;
2834 }
2835
2836 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2837 if (virtio_dev_pktmbuf_prep(dev, pkts[i], lens[i]))
2838 goto err;
2839 }
2840
2841 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2842 buf_lens[i] = pkts[i]->buf_len - pkts[i]->data_off;
2843
2844 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2845 if (unlikely(buf_lens[i] < (lens[i] - buf_offset)))
2846 goto err;
2847 }
2848
2849 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2850 pkts[i]->pkt_len = lens[i] - buf_offset;
2851 pkts[i]->data_len = pkts[i]->pkt_len;
2852 ids[i] = descs[avail_idx + i].id;
2853 }
2854
2855 return 0;
2856
2857err:
2858 return -1;
2859}
2860
2861static __rte_always_inline int
2862virtio_dev_tx_batch_packed(struct virtio_net *dev,
2863 struct vhost_virtqueue *vq,
2864 struct rte_mbuf **pkts,
2865 bool legacy_ol_flags)
2866{
2867 uint16_t avail_idx = vq->last_avail_idx;
2868 uint32_t buf_offset = sizeof(struct virtio_net_hdr_mrg_rxbuf);
2869 struct virtio_net_hdr *hdr;
2870 uintptr_t desc_addrs[PACKED_BATCH_SIZE];
2871 uint16_t ids[PACKED_BATCH_SIZE];
2872 uint16_t i;
2873
2874 if (vhost_reserve_avail_batch_packed(dev, vq, pkts, avail_idx,
2875 desc_addrs, ids))
2876 return -1;
2877
2878 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2879 rte_prefetch0((void *)(uintptr_t)desc_addrs[i]);
2880
2881 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
2882 rte_memcpy(rte_pktmbuf_mtod_offset(pkts[i], void *, 0),
2883 (void *)(uintptr_t)(desc_addrs[i] + buf_offset),
2884 pkts[i]->pkt_len);
2885
2886 if (virtio_net_with_host_offload(dev)) {
2887 vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
2888 hdr = (struct virtio_net_hdr *)(desc_addrs[i]);
2889 vhost_dequeue_offload(dev, hdr, pkts[i], legacy_ol_flags);
2890 }
2891 }
2892
2893 if (virtio_net_is_inorder(dev))
2894 vhost_shadow_dequeue_batch_packed_inorder(vq,
2895 ids[PACKED_BATCH_SIZE - 1]);
2896 else
2897 vhost_shadow_dequeue_batch_packed(dev, vq, ids);
2898
2899 vq_inc_last_avail_packed(vq, PACKED_BATCH_SIZE);
2900
2901 return 0;
2902}
2903
2904static __rte_always_inline int
2905vhost_dequeue_single_packed(struct virtio_net *dev,
2906 struct vhost_virtqueue *vq,
2907 struct rte_mempool *mbuf_pool,
2908 struct rte_mbuf *pkts,
2909 uint16_t *buf_id,
2910 uint16_t *desc_count,
2911 bool legacy_ol_flags)
2912{
2913 struct buf_vector buf_vec[BUF_VECTOR_MAX];
2914 uint32_t buf_len;
2915 uint16_t nr_vec = 0;
2916 int err;
2917 static bool allocerr_warned;
2918
2919 if (unlikely(fill_vec_buf_packed(dev, vq,
2920 vq->last_avail_idx, desc_count,
2921 buf_vec, &nr_vec,
2922 buf_id, &buf_len,
2923 VHOST_ACCESS_RO) < 0))
2924 return -1;
2925
2926 if (unlikely(virtio_dev_pktmbuf_prep(dev, pkts, buf_len))) {
2927 if (!allocerr_warned) {
2928 VHOST_LOG_DATA(ERR, "(%s) failed mbuf alloc of size %d from %s.\n",
2929 dev->ifname, buf_len, mbuf_pool->name);
2930 allocerr_warned = true;
2931 }
2932 return -1;
2933 }
2934
2935 err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts,
2936 mbuf_pool, legacy_ol_flags);
2937 if (unlikely(err)) {
2938 if (!allocerr_warned) {
2939 VHOST_LOG_DATA(ERR, "(%s) failed to copy desc to mbuf.\n",
2940 dev->ifname);
2941 allocerr_warned = true;
2942 }
2943 return -1;
2944 }
2945
2946 return 0;
2947}
2948
2949static __rte_always_inline int
2950virtio_dev_tx_single_packed(struct virtio_net *dev,
2951 struct vhost_virtqueue *vq,
2952 struct rte_mempool *mbuf_pool,
2953 struct rte_mbuf *pkts,
2954 bool legacy_ol_flags)
2955{
2956
2957 uint16_t buf_id, desc_count = 0;
2958 int ret;
2959
2960 ret = vhost_dequeue_single_packed(dev, vq, mbuf_pool, pkts, &buf_id,
2961 &desc_count, legacy_ol_flags);
2962
2963 if (likely(desc_count > 0)) {
2964 if (virtio_net_is_inorder(dev))
2965 vhost_shadow_dequeue_single_packed_inorder(vq, buf_id,
2966 desc_count);
2967 else
2968 vhost_shadow_dequeue_single_packed(vq, buf_id,
2969 desc_count);
2970
2971 vq_inc_last_avail_packed(vq, desc_count);
2972 }
2973
2974 return ret;
2975}
2976
2977__rte_always_inline
2978static uint16_t
2979virtio_dev_tx_packed(struct virtio_net *dev,
2980 struct vhost_virtqueue *__rte_restrict vq,
2981 struct rte_mempool *mbuf_pool,
2982 struct rte_mbuf **__rte_restrict pkts,
2983 uint32_t count,
2984 bool legacy_ol_flags)
2985{
2986 uint32_t pkt_idx = 0;
2987
2988 if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
2989 return 0;
2990
2991 do {
2992 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
2993
2994 if (count - pkt_idx >= PACKED_BATCH_SIZE) {
2995 if (!virtio_dev_tx_batch_packed(dev, vq,
2996 &pkts[pkt_idx],
2997 legacy_ol_flags)) {
2998 pkt_idx += PACKED_BATCH_SIZE;
2999 continue;
3000 }
3001 }
3002
3003 if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
3004 pkts[pkt_idx],
3005 legacy_ol_flags))
3006 break;
3007 pkt_idx++;
3008 } while (pkt_idx < count);
3009
3010 if (pkt_idx != count)
3011 rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
3012
3013 if (vq->shadow_used_idx) {
3014 do_data_copy_dequeue(vq);
3015
3016 vhost_flush_dequeue_shadow_packed(dev, vq);
3017 vhost_vring_call_packed(dev, vq);
3018 }
3019
3020 return pkt_idx;
3021}
3022
3023__rte_noinline
3024static uint16_t
3025virtio_dev_tx_packed_legacy(struct virtio_net *dev,
3026 struct vhost_virtqueue *__rte_restrict vq, struct rte_mempool *mbuf_pool,
3027 struct rte_mbuf **__rte_restrict pkts, uint32_t count)
3028{
3029 return virtio_dev_tx_packed(dev, vq, mbuf_pool, pkts, count, true);
3030}
3031
3032__rte_noinline
3033static uint16_t
3034virtio_dev_tx_packed_compliant(struct virtio_net *dev,
3035 struct vhost_virtqueue *__rte_restrict vq, struct rte_mempool *mbuf_pool,
3036 struct rte_mbuf **__rte_restrict pkts, uint32_t count)
3037{
3038 return virtio_dev_tx_packed(dev, vq, mbuf_pool, pkts, count, false);
3039}
3040
3041uint16_t
3042rte_vhost_dequeue_burst(int vid, uint16_t queue_id,
3043 struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
3044{
3045 struct virtio_net *dev;
3046 struct rte_mbuf *rarp_mbuf = NULL;
3047 struct vhost_virtqueue *vq;
3048 int16_t success = 1;
3049
3050 dev = get_device(vid);
3051 if (!dev)
3052 return 0;
3053
3054 if (unlikely(!(dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET))) {
3055 VHOST_LOG_DATA(ERR, "(%s) %s: built-in vhost net backend is disabled.\n",
3056 dev->ifname, __func__);
3057 return 0;
3058 }
3059
3060 if (unlikely(!is_valid_virt_queue_idx(queue_id, 1, dev->nr_vring))) {
3061 VHOST_LOG_DATA(ERR, "(%s) %s: invalid virtqueue idx %d.\n",
3062 dev->ifname, __func__, queue_id);
3063 return 0;
3064 }
3065
3066 vq = dev->virtqueue[queue_id];
3067
3068 if (unlikely(rte_spinlock_trylock(&vq->access_lock) == 0))
3069 return 0;
3070
3071 if (unlikely(!vq->enabled)) {
3072 count = 0;
3073 goto out_access_unlock;
3074 }
3075
3076 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
3077 vhost_user_iotlb_rd_lock(vq);
3078
3079 if (unlikely(!vq->access_ok))
3080 if (unlikely(vring_translate(dev, vq) < 0)) {
3081 count = 0;
3082 goto out;
3083 }
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101 if (unlikely(__atomic_load_n(&dev->broadcast_rarp, __ATOMIC_ACQUIRE) &&
3102 __atomic_compare_exchange_n(&dev->broadcast_rarp,
3103 &success, 0, 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED))) {
3104
3105 rarp_mbuf = rte_net_make_rarp_packet(mbuf_pool, &dev->mac);
3106 if (rarp_mbuf == NULL) {
3107 VHOST_LOG_DATA(ERR, "(%s) failed to make RARP packet.\n", dev->ifname);
3108 count = 0;
3109 goto out;
3110 }
3111
3112
3113
3114
3115 pkts[0] = rarp_mbuf;
3116 pkts++;
3117 count -= 1;
3118 }
3119
3120 if (vq_is_packed(dev)) {
3121 if (dev->flags & VIRTIO_DEV_LEGACY_OL_FLAGS)
3122 count = virtio_dev_tx_packed_legacy(dev, vq, mbuf_pool, pkts, count);
3123 else
3124 count = virtio_dev_tx_packed_compliant(dev, vq, mbuf_pool, pkts, count);
3125 } else {
3126 if (dev->flags & VIRTIO_DEV_LEGACY_OL_FLAGS)
3127 count = virtio_dev_tx_split_legacy(dev, vq, mbuf_pool, pkts, count);
3128 else
3129 count = virtio_dev_tx_split_compliant(dev, vq, mbuf_pool, pkts, count);
3130 }
3131
3132out:
3133 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
3134 vhost_user_iotlb_rd_unlock(vq);
3135
3136out_access_unlock:
3137 rte_spinlock_unlock(&vq->access_lock);
3138
3139 if (unlikely(rarp_mbuf != NULL))
3140 count += 1;
3141
3142 return count;
3143}
3144