net/enic: refactor Tx mbuf recycling
[dpdk.git] / drivers / net / virtio / virtio_rxtx.c
1 /*-
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33
34 #include <stdint.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <errno.h>
39
40 #include <rte_cycles.h>
41 #include <rte_memory.h>
42 #include <rte_memzone.h>
43 #include <rte_branch_prediction.h>
44 #include <rte_mempool.h>
45 #include <rte_malloc.h>
46 #include <rte_mbuf.h>
47 #include <rte_ether.h>
48 #include <rte_ethdev.h>
49 #include <rte_prefetch.h>
50 #include <rte_string_fns.h>
51 #include <rte_errno.h>
52 #include <rte_byteorder.h>
53
54 #include "virtio_logs.h"
55 #include "virtio_ethdev.h"
56 #include "virtio_pci.h"
57 #include "virtqueue.h"
58 #include "virtio_rxtx.h"
59
60 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
61 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
62 #else
63 #define  VIRTIO_DUMP_PACKET(m, len) do { } while (0)
64 #endif
65
66
67 #define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
68         ETH_TXQ_FLAGS_NOOFFLOADS)
69
70 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
71 static int use_simple_rxtx;
72 #endif
73
74 static void
75 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
76 {
77         struct vring_desc *dp, *dp_tail;
78         struct vq_desc_extra *dxp;
79         uint16_t desc_idx_last = desc_idx;
80
81         dp  = &vq->vq_ring.desc[desc_idx];
82         dxp = &vq->vq_descx[desc_idx];
83         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
84         if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
85                 while (dp->flags & VRING_DESC_F_NEXT) {
86                         desc_idx_last = dp->next;
87                         dp = &vq->vq_ring.desc[dp->next];
88                 }
89         }
90         dxp->ndescs = 0;
91
92         /*
93          * We must append the existing free chain, if any, to the end of
94          * newly freed chain. If the virtqueue was completely used, then
95          * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
96          */
97         if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
98                 vq->vq_desc_head_idx = desc_idx;
99         } else {
100                 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
101                 dp_tail->next = desc_idx;
102         }
103
104         vq->vq_desc_tail_idx = desc_idx_last;
105         dp->next = VQ_RING_DESC_CHAIN_END;
106 }
107
108 static uint16_t
109 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
110                            uint32_t *len, uint16_t num)
111 {
112         struct vring_used_elem *uep;
113         struct rte_mbuf *cookie;
114         uint16_t used_idx, desc_idx;
115         uint16_t i;
116
117         /*  Caller does the check */
118         for (i = 0; i < num ; i++) {
119                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
120                 uep = &vq->vq_ring.used->ring[used_idx];
121                 desc_idx = (uint16_t) uep->id;
122                 len[i] = uep->len;
123                 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
124
125                 if (unlikely(cookie == NULL)) {
126                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n",
127                                 vq->vq_used_cons_idx);
128                         break;
129                 }
130
131                 rte_prefetch0(cookie);
132                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
133                 rx_pkts[i]  = cookie;
134                 vq->vq_used_cons_idx++;
135                 vq_ring_free_chain(vq, desc_idx);
136                 vq->vq_descx[desc_idx].cookie = NULL;
137         }
138
139         return i;
140 }
141
142 #ifndef DEFAULT_TX_FREE_THRESH
143 #define DEFAULT_TX_FREE_THRESH 32
144 #endif
145
146 /* Cleanup from completed transmits. */
147 static void
148 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
149 {
150         uint16_t i, used_idx, desc_idx;
151         for (i = 0; i < num; i++) {
152                 struct vring_used_elem *uep;
153                 struct vq_desc_extra *dxp;
154
155                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
156                 uep = &vq->vq_ring.used->ring[used_idx];
157
158                 desc_idx = (uint16_t) uep->id;
159                 dxp = &vq->vq_descx[desc_idx];
160                 vq->vq_used_cons_idx++;
161                 vq_ring_free_chain(vq, desc_idx);
162
163                 if (dxp->cookie != NULL) {
164                         rte_pktmbuf_free(dxp->cookie);
165                         dxp->cookie = NULL;
166                 }
167         }
168 }
169
170
171 static inline int
172 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
173 {
174         struct vq_desc_extra *dxp;
175         struct virtio_hw *hw = vq->hw;
176         struct vring_desc *start_dp;
177         uint16_t needed = 1;
178         uint16_t head_idx, idx;
179
180         if (unlikely(vq->vq_free_cnt == 0))
181                 return -ENOSPC;
182         if (unlikely(vq->vq_free_cnt < needed))
183                 return -EMSGSIZE;
184
185         head_idx = vq->vq_desc_head_idx;
186         if (unlikely(head_idx >= vq->vq_nentries))
187                 return -EFAULT;
188
189         idx = head_idx;
190         dxp = &vq->vq_descx[idx];
191         dxp->cookie = (void *)cookie;
192         dxp->ndescs = needed;
193
194         start_dp = vq->vq_ring.desc;
195         start_dp[idx].addr =
196                 MBUF_DATA_DMA_ADDR(cookie, vq->offset) - hw->vtnet_hdr_size;
197         start_dp[idx].len =
198                 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
199         start_dp[idx].flags =  VRING_DESC_F_WRITE;
200         idx = start_dp[idx].next;
201         vq->vq_desc_head_idx = idx;
202         if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
203                 vq->vq_desc_tail_idx = idx;
204         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
205         vq_update_avail_ring(vq, head_idx);
206
207         return 0;
208 }
209
210 static inline void
211 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
212                        uint16_t needed, int use_indirect, int can_push)
213 {
214         struct vq_desc_extra *dxp;
215         struct virtqueue *vq = txvq->vq;
216         struct vring_desc *start_dp;
217         uint16_t seg_num = cookie->nb_segs;
218         uint16_t head_idx, idx;
219         uint16_t head_size = vq->hw->vtnet_hdr_size;
220         unsigned long offs;
221
222         head_idx = vq->vq_desc_head_idx;
223         idx = head_idx;
224         dxp = &vq->vq_descx[idx];
225         dxp->cookie = (void *)cookie;
226         dxp->ndescs = needed;
227
228         start_dp = vq->vq_ring.desc;
229
230         if (can_push) {
231                 /* put on zero'd transmit header (no offloads) */
232                 void *hdr = rte_pktmbuf_prepend(cookie, head_size);
233
234                 memset(hdr, 0, head_size);
235         } else if (use_indirect) {
236                 /* setup tx ring slot to point to indirect
237                  * descriptor list stored in reserved region.
238                  *
239                  * the first slot in indirect ring is already preset
240                  * to point to the header in reserved region
241                  */
242                 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
243
244                 offs = idx * sizeof(struct virtio_tx_region)
245                         + offsetof(struct virtio_tx_region, tx_indir);
246
247                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem + offs;
248                 start_dp[idx].len   = (seg_num + 1) * sizeof(struct vring_desc);
249                 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
250
251                 /* loop below will fill in rest of the indirect elements */
252                 start_dp = txr[idx].tx_indir;
253                 idx = 1;
254         } else {
255                 /* setup first tx ring slot to point to header
256                  * stored in reserved region.
257                  */
258                 offs = idx * sizeof(struct virtio_tx_region)
259                         + offsetof(struct virtio_tx_region, tx_hdr);
260
261                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem + offs;
262                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
263                 start_dp[idx].flags = VRING_DESC_F_NEXT;
264                 idx = start_dp[idx].next;
265         }
266
267         do {
268                 start_dp[idx].addr  = MBUF_DATA_DMA_ADDR(cookie, vq->offset);
269                 start_dp[idx].len   = cookie->data_len;
270                 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
271                 idx = start_dp[idx].next;
272         } while ((cookie = cookie->next) != NULL);
273
274         if (use_indirect)
275                 idx = vq->vq_ring.desc[head_idx].next;
276
277         vq->vq_desc_head_idx = idx;
278         if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
279                 vq->vq_desc_tail_idx = idx;
280         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
281         vq_update_avail_ring(vq, head_idx);
282 }
283
284 static void
285 virtio_dev_vring_start(struct virtqueue *vq)
286 {
287         int size = vq->vq_nentries;
288         struct vring *vr = &vq->vq_ring;
289         uint8_t *ring_mem = vq->vq_ring_virt_mem;
290
291         PMD_INIT_FUNC_TRACE();
292
293         /*
294          * Reinitialise since virtio port might have been stopped and restarted
295          */
296         memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
297         vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
298         vq->vq_used_cons_idx = 0;
299         vq->vq_desc_head_idx = 0;
300         vq->vq_avail_idx = 0;
301         vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
302         vq->vq_free_cnt = vq->vq_nentries;
303         memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
304
305         vring_desc_init(vr->desc, size);
306
307         /*
308          * Disable device(host) interrupting guest
309          */
310         virtqueue_disable_intr(vq);
311 }
312
313 void
314 virtio_dev_cq_start(struct rte_eth_dev *dev)
315 {
316         struct virtio_hw *hw = dev->data->dev_private;
317
318         if (hw->cvq && hw->cvq->vq) {
319                 virtio_dev_vring_start(hw->cvq->vq);
320                 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
321         }
322 }
323
324 void
325 virtio_dev_rxtx_start(struct rte_eth_dev *dev)
326 {
327         /*
328          * Start receive and transmit vrings
329          * -    Setup vring structure for all queues
330          * -    Initialize descriptor for the rx vring
331          * -    Allocate blank mbufs for the each rx descriptor
332          *
333          */
334         uint16_t i;
335         uint16_t desc_idx;
336
337         PMD_INIT_FUNC_TRACE();
338
339         /* Start rx vring. */
340         for (i = 0; i < dev->data->nb_rx_queues; i++) {
341                 struct virtnet_rx *rxvq = dev->data->rx_queues[i];
342                 struct virtqueue *vq = rxvq->vq;
343                 int error, nbufs;
344                 struct rte_mbuf *m;
345
346                 virtio_dev_vring_start(vq);
347                 if (rxvq->mpool == NULL) {
348                         rte_exit(EXIT_FAILURE,
349                                 "Cannot allocate mbufs for rx virtqueue");
350                 }
351
352                 /* Allocate blank mbufs for the each rx descriptor */
353                 nbufs = 0;
354                 error = ENOSPC;
355
356 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
357                 if (use_simple_rxtx) {
358                         for (desc_idx = 0; desc_idx < vq->vq_nentries;
359                              desc_idx++) {
360                                 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
361                                 vq->vq_ring.desc[desc_idx].flags =
362                                         VRING_DESC_F_WRITE;
363                         }
364                 }
365 #endif
366                 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
367                 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
368                      desc_idx++) {
369                         vq->sw_ring[vq->vq_nentries + desc_idx] =
370                                 &rxvq->fake_mbuf;
371                 }
372
373                 while (!virtqueue_full(vq)) {
374                         m = rte_mbuf_raw_alloc(rxvq->mpool);
375                         if (m == NULL)
376                                 break;
377
378                         /******************************************
379                         *         Enqueue allocated buffers        *
380                         *******************************************/
381 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
382                         if (use_simple_rxtx)
383                                 error = virtqueue_enqueue_recv_refill_simple(vq, m);
384                         else
385 #endif
386                                 error = virtqueue_enqueue_recv_refill(vq, m);
387                         if (error) {
388                                 rte_pktmbuf_free(m);
389                                 break;
390                         }
391                         nbufs++;
392                 }
393
394                 vq_update_avail_idx(vq);
395
396                 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
397
398                 VIRTQUEUE_DUMP(vq);
399         }
400
401         /* Start tx vring. */
402         for (i = 0; i < dev->data->nb_tx_queues; i++) {
403                 struct virtnet_tx *txvq = dev->data->tx_queues[i];
404                 struct virtqueue *vq = txvq->vq;
405
406                 virtio_dev_vring_start(vq);
407 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
408                 if (use_simple_rxtx) {
409                         uint16_t mid_idx  = vq->vq_nentries >> 1;
410
411                         for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
412                                 vq->vq_ring.avail->ring[desc_idx] =
413                                         desc_idx + mid_idx;
414                                 vq->vq_ring.desc[desc_idx + mid_idx].next =
415                                         desc_idx;
416                                 vq->vq_ring.desc[desc_idx + mid_idx].addr =
417                                         txvq->virtio_net_hdr_mem +
418                                         offsetof(struct virtio_tx_region, tx_hdr);
419                                 vq->vq_ring.desc[desc_idx + mid_idx].len =
420                                         vq->hw->vtnet_hdr_size;
421                                 vq->vq_ring.desc[desc_idx + mid_idx].flags =
422                                         VRING_DESC_F_NEXT;
423                                 vq->vq_ring.desc[desc_idx].flags = 0;
424                         }
425                         for (desc_idx = mid_idx; desc_idx < vq->vq_nentries;
426                              desc_idx++)
427                                 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
428                 }
429 #endif
430                 VIRTQUEUE_DUMP(vq);
431         }
432 }
433
434 int
435 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
436                         uint16_t queue_idx,
437                         uint16_t nb_desc,
438                         unsigned int socket_id,
439                         __rte_unused const struct rte_eth_rxconf *rx_conf,
440                         struct rte_mempool *mp)
441 {
442         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
443         struct virtnet_rx *rxvq;
444         int ret;
445
446         PMD_INIT_FUNC_TRACE();
447         ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
448                         nb_desc, socket_id, (void **)&rxvq);
449         if (ret < 0) {
450                 PMD_INIT_LOG(ERR, "rvq initialization failed");
451                 return ret;
452         }
453
454         /* Create mempool for rx mbuf allocation */
455         rxvq->mpool = mp;
456
457         dev->data->rx_queues[queue_idx] = rxvq;
458
459 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
460         virtio_rxq_vec_setup(rxvq);
461 #endif
462
463         return 0;
464 }
465
466 void
467 virtio_dev_rx_queue_release(void *rxq)
468 {
469         struct virtnet_rx *rxvq = rxq;
470         struct virtqueue *vq = rxvq->vq;
471         /* rxvq is freed when vq is freed, and as mz should be freed after the
472          * del_queue, so we reserve the mz pointer first.
473          */
474         const struct rte_memzone *mz = rxvq->mz;
475
476         /* no need to free rxq as vq and rxq are allocated together */
477         virtio_dev_queue_release(vq);
478         rte_memzone_free(mz);
479 }
480
481 /*
482  * struct rte_eth_dev *dev: Used to update dev
483  * uint16_t nb_desc: Defaults to values read from config space
484  * unsigned int socket_id: Used to allocate memzone
485  * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
486  * uint16_t queue_idx: Just used as an index in dev txq list
487  */
488 int
489 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
490                         uint16_t queue_idx,
491                         uint16_t nb_desc,
492                         unsigned int socket_id,
493                         const struct rte_eth_txconf *tx_conf)
494 {
495         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
496
497 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
498         struct virtio_hw *hw = dev->data->dev_private;
499 #endif
500         struct virtnet_tx *txvq;
501         struct virtqueue *vq;
502         uint16_t tx_free_thresh;
503         int ret;
504
505         PMD_INIT_FUNC_TRACE();
506
507         if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS)
508             != ETH_TXQ_FLAGS_NOXSUMS) {
509                 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
510                 return -EINVAL;
511         }
512
513 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
514         /* Use simple rx/tx func if single segment and no offloads */
515         if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
516              !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
517                 PMD_INIT_LOG(INFO, "Using simple rx/tx path");
518                 dev->tx_pkt_burst = virtio_xmit_pkts_simple;
519                 dev->rx_pkt_burst = virtio_recv_pkts_vec;
520                 use_simple_rxtx = 1;
521         }
522 #endif
523
524         ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
525                         nb_desc, socket_id, (void **)&txvq);
526         if (ret < 0) {
527                 PMD_INIT_LOG(ERR, "tvq initialization failed");
528                 return ret;
529         }
530         vq = txvq->vq;
531
532         tx_free_thresh = tx_conf->tx_free_thresh;
533         if (tx_free_thresh == 0)
534                 tx_free_thresh =
535                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
536
537         if (tx_free_thresh >= (vq->vq_nentries - 3)) {
538                 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
539                         "number of TX entries minus 3 (%u)."
540                         " (tx_free_thresh=%u port=%u queue=%u)\n",
541                         vq->vq_nentries - 3,
542                         tx_free_thresh, dev->data->port_id, queue_idx);
543                 return -EINVAL;
544         }
545
546         vq->vq_free_thresh = tx_free_thresh;
547
548         dev->data->tx_queues[queue_idx] = txvq;
549         return 0;
550 }
551
552 void
553 virtio_dev_tx_queue_release(void *txq)
554 {
555         struct virtnet_tx *txvq = txq;
556         struct virtqueue *vq = txvq->vq;
557         /* txvq is freed when vq is freed, and as mz should be freed after the
558          * del_queue, so we reserve the mz pointer first.
559          */
560         const struct rte_memzone *hdr_mz = txvq->virtio_net_hdr_mz;
561         const struct rte_memzone *mz = txvq->mz;
562
563         virtio_dev_queue_release(vq);
564         rte_memzone_free(mz);
565         rte_memzone_free(hdr_mz);
566 }
567
568 static void
569 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
570 {
571         int error;
572         /*
573          * Requeue the discarded mbuf. This should always be
574          * successful since it was just dequeued.
575          */
576         error = virtqueue_enqueue_recv_refill(vq, m);
577         if (unlikely(error)) {
578                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
579                 rte_pktmbuf_free(m);
580         }
581 }
582
583 static void
584 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
585 {
586         uint32_t s = mbuf->pkt_len;
587         struct ether_addr *ea;
588
589         if (s == 64) {
590                 stats->size_bins[1]++;
591         } else if (s > 64 && s < 1024) {
592                 uint32_t bin;
593
594                 /* count zeros, and offset into correct bin */
595                 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
596                 stats->size_bins[bin]++;
597         } else {
598                 if (s < 64)
599                         stats->size_bins[0]++;
600                 else if (s < 1519)
601                         stats->size_bins[6]++;
602                 else if (s >= 1519)
603                         stats->size_bins[7]++;
604         }
605
606         ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
607         if (is_multicast_ether_addr(ea)) {
608                 if (is_broadcast_ether_addr(ea))
609                         stats->broadcast++;
610                 else
611                         stats->multicast++;
612         }
613 }
614
615 #define VIRTIO_MBUF_BURST_SZ 64
616 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
617 uint16_t
618 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
619 {
620         struct virtnet_rx *rxvq = rx_queue;
621         struct virtqueue *vq = rxvq->vq;
622         struct virtio_hw *hw;
623         struct rte_mbuf *rxm, *new_mbuf;
624         uint16_t nb_used, num, nb_rx;
625         uint32_t len[VIRTIO_MBUF_BURST_SZ];
626         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
627         int error;
628         uint32_t i, nb_enqueued;
629         uint32_t hdr_size;
630
631         nb_used = VIRTQUEUE_NUSED(vq);
632
633         virtio_rmb();
634
635         num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
636         num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
637         if (likely(num > DESC_PER_CACHELINE))
638                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
639
640         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
641         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
642
643         hw = vq->hw;
644         nb_rx = 0;
645         nb_enqueued = 0;
646         hdr_size = hw->vtnet_hdr_size;
647
648         for (i = 0; i < num ; i++) {
649                 rxm = rcv_pkts[i];
650
651                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
652
653                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
654                         PMD_RX_LOG(ERR, "Packet drop");
655                         nb_enqueued++;
656                         virtio_discard_rxbuf(vq, rxm);
657                         rxvq->stats.errors++;
658                         continue;
659                 }
660
661                 rxm->port = rxvq->port_id;
662                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
663                 rxm->ol_flags = 0;
664                 rxm->vlan_tci = 0;
665
666                 rxm->nb_segs = 1;
667                 rxm->next = NULL;
668                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
669                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
670
671                 if (hw->vlan_strip)
672                         rte_vlan_strip(rxm);
673
674                 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
675
676                 rx_pkts[nb_rx++] = rxm;
677
678                 rxvq->stats.bytes += rx_pkts[nb_rx - 1]->pkt_len;
679                 virtio_update_packet_stats(&rxvq->stats, rxm);
680         }
681
682         rxvq->stats.packets += nb_rx;
683
684         /* Allocate new mbuf for the used descriptor */
685         error = ENOSPC;
686         while (likely(!virtqueue_full(vq))) {
687                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
688                 if (unlikely(new_mbuf == NULL)) {
689                         struct rte_eth_dev *dev
690                                 = &rte_eth_devices[rxvq->port_id];
691                         dev->data->rx_mbuf_alloc_failed++;
692                         break;
693                 }
694                 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
695                 if (unlikely(error)) {
696                         rte_pktmbuf_free(new_mbuf);
697                         break;
698                 }
699                 nb_enqueued++;
700         }
701
702         if (likely(nb_enqueued)) {
703                 vq_update_avail_idx(vq);
704
705                 if (unlikely(virtqueue_kick_prepare(vq))) {
706                         virtqueue_notify(vq);
707                         PMD_RX_LOG(DEBUG, "Notified");
708                 }
709         }
710
711         return nb_rx;
712 }
713
714 uint16_t
715 virtio_recv_mergeable_pkts(void *rx_queue,
716                         struct rte_mbuf **rx_pkts,
717                         uint16_t nb_pkts)
718 {
719         struct virtnet_rx *rxvq = rx_queue;
720         struct virtqueue *vq = rxvq->vq;
721         struct virtio_hw *hw;
722         struct rte_mbuf *rxm, *new_mbuf;
723         uint16_t nb_used, num, nb_rx;
724         uint32_t len[VIRTIO_MBUF_BURST_SZ];
725         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
726         struct rte_mbuf *prev;
727         int error;
728         uint32_t i, nb_enqueued;
729         uint32_t seg_num;
730         uint16_t extra_idx;
731         uint32_t seg_res;
732         uint32_t hdr_size;
733
734         nb_used = VIRTQUEUE_NUSED(vq);
735
736         virtio_rmb();
737
738         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
739
740         hw = vq->hw;
741         nb_rx = 0;
742         i = 0;
743         nb_enqueued = 0;
744         seg_num = 0;
745         extra_idx = 0;
746         seg_res = 0;
747         hdr_size = hw->vtnet_hdr_size;
748
749         while (i < nb_used) {
750                 struct virtio_net_hdr_mrg_rxbuf *header;
751
752                 if (nb_rx == nb_pkts)
753                         break;
754
755                 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
756                 if (num != 1)
757                         continue;
758
759                 i++;
760
761                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
762                 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
763
764                 rxm = rcv_pkts[0];
765
766                 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
767                         PMD_RX_LOG(ERR, "Packet drop");
768                         nb_enqueued++;
769                         virtio_discard_rxbuf(vq, rxm);
770                         rxvq->stats.errors++;
771                         continue;
772                 }
773
774                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
775                         RTE_PKTMBUF_HEADROOM - hdr_size);
776                 seg_num = header->num_buffers;
777
778                 if (seg_num == 0)
779                         seg_num = 1;
780
781                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
782                 rxm->nb_segs = seg_num;
783                 rxm->next = NULL;
784                 rxm->ol_flags = 0;
785                 rxm->vlan_tci = 0;
786                 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
787                 rxm->data_len = (uint16_t)(len[0] - hdr_size);
788
789                 rxm->port = rxvq->port_id;
790                 rx_pkts[nb_rx] = rxm;
791                 prev = rxm;
792
793                 seg_res = seg_num - 1;
794
795                 while (seg_res != 0) {
796                         /*
797                          * Get extra segments for current uncompleted packet.
798                          */
799                         uint16_t  rcv_cnt =
800                                 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
801                         if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
802                                 uint32_t rx_num =
803                                         virtqueue_dequeue_burst_rx(vq,
804                                         rcv_pkts, len, rcv_cnt);
805                                 i += rx_num;
806                                 rcv_cnt = rx_num;
807                         } else {
808                                 PMD_RX_LOG(ERR,
809                                            "No enough segments for packet.");
810                                 nb_enqueued++;
811                                 virtio_discard_rxbuf(vq, rxm);
812                                 rxvq->stats.errors++;
813                                 break;
814                         }
815
816                         extra_idx = 0;
817
818                         while (extra_idx < rcv_cnt) {
819                                 rxm = rcv_pkts[extra_idx];
820
821                                 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
822                                 rxm->next = NULL;
823                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
824                                 rxm->data_len = (uint16_t)(len[extra_idx]);
825
826                                 if (prev)
827                                         prev->next = rxm;
828
829                                 prev = rxm;
830                                 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
831                                 extra_idx++;
832                         };
833                         seg_res -= rcv_cnt;
834                 }
835
836                 if (hw->vlan_strip)
837                         rte_vlan_strip(rx_pkts[nb_rx]);
838
839                 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
840                         rx_pkts[nb_rx]->data_len);
841
842                 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
843                 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
844                 nb_rx++;
845         }
846
847         rxvq->stats.packets += nb_rx;
848
849         /* Allocate new mbuf for the used descriptor */
850         error = ENOSPC;
851         while (likely(!virtqueue_full(vq))) {
852                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
853                 if (unlikely(new_mbuf == NULL)) {
854                         struct rte_eth_dev *dev
855                                 = &rte_eth_devices[rxvq->port_id];
856                         dev->data->rx_mbuf_alloc_failed++;
857                         break;
858                 }
859                 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
860                 if (unlikely(error)) {
861                         rte_pktmbuf_free(new_mbuf);
862                         break;
863                 }
864                 nb_enqueued++;
865         }
866
867         if (likely(nb_enqueued)) {
868                 vq_update_avail_idx(vq);
869
870                 if (unlikely(virtqueue_kick_prepare(vq))) {
871                         virtqueue_notify(vq);
872                         PMD_RX_LOG(DEBUG, "Notified");
873                 }
874         }
875
876         return nb_rx;
877 }
878
879 uint16_t
880 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
881 {
882         struct virtnet_tx *txvq = tx_queue;
883         struct virtqueue *vq = txvq->vq;
884         struct virtio_hw *hw = vq->hw;
885         uint16_t hdr_size = hw->vtnet_hdr_size;
886         uint16_t nb_used, nb_tx;
887         int error;
888
889         if (unlikely(nb_pkts < 1))
890                 return nb_pkts;
891
892         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
893         nb_used = VIRTQUEUE_NUSED(vq);
894
895         virtio_rmb();
896         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
897                 virtio_xmit_cleanup(vq, nb_used);
898
899         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
900                 struct rte_mbuf *txm = tx_pkts[nb_tx];
901                 int can_push = 0, use_indirect = 0, slots, need;
902
903                 /* Do VLAN tag insertion */
904                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
905                         error = rte_vlan_insert(&txm);
906                         if (unlikely(error)) {
907                                 rte_pktmbuf_free(txm);
908                                 continue;
909                         }
910                 }
911
912                 /* optimize ring usage */
913                 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
914                     rte_mbuf_refcnt_read(txm) == 1 &&
915                     RTE_MBUF_DIRECT(txm) &&
916                     txm->nb_segs == 1 &&
917                     rte_pktmbuf_headroom(txm) >= hdr_size &&
918                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
919                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
920                         can_push = 1;
921                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
922                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
923                         use_indirect = 1;
924
925                 /* How many main ring entries are needed to this Tx?
926                  * any_layout => number of segments
927                  * indirect   => 1
928                  * default    => number of segments + 1
929                  */
930                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
931                 need = slots - vq->vq_free_cnt;
932
933                 /* Positive value indicates it need free vring descriptors */
934                 if (unlikely(need > 0)) {
935                         nb_used = VIRTQUEUE_NUSED(vq);
936                         virtio_rmb();
937                         need = RTE_MIN(need, (int)nb_used);
938
939                         virtio_xmit_cleanup(vq, need);
940                         need = slots - vq->vq_free_cnt;
941                         if (unlikely(need > 0)) {
942                                 PMD_TX_LOG(ERR,
943                                            "No free tx descriptors to transmit");
944                                 break;
945                         }
946                 }
947
948                 /* Enqueue Packet buffers */
949                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
950
951                 txvq->stats.bytes += txm->pkt_len;
952                 virtio_update_packet_stats(&txvq->stats, txm);
953         }
954
955         txvq->stats.packets += nb_tx;
956
957         if (likely(nb_tx)) {
958                 vq_update_avail_idx(vq);
959
960                 if (unlikely(virtqueue_kick_prepare(vq))) {
961                         virtqueue_notify(vq);
962                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
963                 }
964         }
965
966         return nb_tx;
967 }