drivers/net/virtio/virtio_rxtx.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <stdint.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <errno.h>
  10
  11 #include <rte_cycles.h>
  12 #include <rte_memory.h>
  13 #include <rte_branch_prediction.h>
  14 #include <rte_mempool.h>
  15 #include <rte_malloc.h>
  16 #include <rte_mbuf.h>
  17 #include <rte_ether.h>
  18 #include <rte_ethdev_driver.h>
  19 #include <rte_prefetch.h>
  20 #include <rte_string_fns.h>
  21 #include <rte_errno.h>
  22 #include <rte_byteorder.h>
  23 #include <rte_net.h>
  24 #include <rte_ip.h>
  25 #include <rte_udp.h>
  26 #include <rte_tcp.h>
  27
  28 #include "virtio_logs.h"
  29 #include "virtio_ethdev.h"
  30 #include "virtio_pci.h"
  31 #include "virtqueue.h"
  32 #include "virtio_rxtx.h"
  33 #include "virtio_rxtx_simple.h"
  34 #include "virtio_ring.h"
  35
  36 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
  37 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
  38 #else
  39 #define  VIRTIO_DUMP_PACKET(m, len) do { } while (0)
  40 #endif
  41
  42 int
  43 virtio_dev_rx_queue_done(void *rxq, uint16_t offset)
  44 {
  45         struct virtnet_rx *rxvq = rxq;
  46         struct virtqueue *vq = rxvq->vq;
  47
  48         return virtqueue_nused(vq) >= offset;
  49 }
  50
  51 void
  52 vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num)
  53 {
  54         vq->vq_free_cnt += num;
  55         vq->vq_desc_tail_idx = desc_idx & (vq->vq_nentries - 1);
  56 }
  57
  58 void
  59 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
  60 {
  61         struct vring_desc *dp, *dp_tail;
  62         struct vq_desc_extra *dxp;
  63         uint16_t desc_idx_last = desc_idx;
  64
  65         dp  = &vq->vq_split.ring.desc[desc_idx];
  66         dxp = &vq->vq_descx[desc_idx];
  67         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
  68         if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
  69                 while (dp->flags & VRING_DESC_F_NEXT) {
  70                         desc_idx_last = dp->next;
  71                         dp = &vq->vq_split.ring.desc[dp->next];
  72                 }
  73         }
  74         dxp->ndescs = 0;
  75
  76         /*
  77          * We must append the existing free chain, if any, to the end of
  78          * newly freed chain. If the virtqueue was completely used, then
  79          * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
  80          */
  81         if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
  82                 vq->vq_desc_head_idx = desc_idx;
  83         } else {
  84                 dp_tail = &vq->vq_split.ring.desc[vq->vq_desc_tail_idx];
  85                 dp_tail->next = desc_idx;
  86         }
  87
  88         vq->vq_desc_tail_idx = desc_idx_last;
  89         dp->next = VQ_RING_DESC_CHAIN_END;
  90 }
  91
  92 void
  93 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
  94 {
  95         uint32_t s = mbuf->pkt_len;
  96         struct rte_ether_addr *ea;
  97
  98         stats->bytes += s;
  99
 100         if (s == 64) {
 101                 stats->size_bins[1]++;
 102         } else if (s > 64 && s < 1024) {
 103                 uint32_t bin;
 104
 105                 /* count zeros, and offset into correct bin */
 106                 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
 107                 stats->size_bins[bin]++;
 108         } else {
 109                 if (s < 64)
 110                         stats->size_bins[0]++;
 111                 else if (s < 1519)
 112                         stats->size_bins[6]++;
 113                 else
 114                         stats->size_bins[7]++;
 115         }
 116
 117         ea = rte_pktmbuf_mtod(mbuf, struct rte_ether_addr *);
 118         if (rte_is_multicast_ether_addr(ea)) {
 119                 if (rte_is_broadcast_ether_addr(ea))
 120                         stats->broadcast++;
 121                 else
 122                         stats->multicast++;
 123         }
 124 }
 125
 126 static inline void
 127 virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
 128 {
 129         VIRTIO_DUMP_PACKET(m, m->data_len);
 130
 131         virtio_update_packet_stats(&rxvq->stats, m);
 132 }
 133
 134 static uint16_t
 135 virtqueue_dequeue_burst_rx_packed(struct virtqueue *vq,
 136                                   struct rte_mbuf **rx_pkts,
 137                                   uint32_t *len,
 138                                   uint16_t num)
 139 {
 140         struct rte_mbuf *cookie;
 141         uint16_t used_idx;
 142         uint16_t id;
 143         struct vring_packed_desc *desc;
 144         uint16_t i;
 145
 146         desc = vq->vq_packed.ring.desc;
 147
 148         for (i = 0; i < num; i++) {
 149                 used_idx = vq->vq_used_cons_idx;
 150                 /* desc_is_used has a load-acquire or rte_cio_rmb inside
 151                  * and wait for used desc in virtqueue.
 152                  */
 153                 if (!desc_is_used(&desc[used_idx], vq))
 154                         return i;
 155                 len[i] = desc[used_idx].len;
 156                 id = desc[used_idx].id;
 157                 cookie = (struct rte_mbuf *)vq->vq_descx[id].cookie;
 158                 if (unlikely(cookie == NULL)) {
 159                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 160                                 vq->vq_used_cons_idx);
 161                         break;
 162                 }
 163                 rte_prefetch0(cookie);
 164                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 165                 rx_pkts[i] = cookie;
 166
 167                 vq->vq_free_cnt++;
 168                 vq->vq_used_cons_idx++;
 169                 if (vq->vq_used_cons_idx >= vq->vq_nentries) {
 170                         vq->vq_used_cons_idx -= vq->vq_nentries;
 171                         vq->vq_packed.used_wrap_counter ^= 1;
 172                 }
 173         }
 174
 175         return i;
 176 }
 177
 178 static uint16_t
 179 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
 180                            uint32_t *len, uint16_t num)
 181 {
 182         struct vring_used_elem *uep;
 183         struct rte_mbuf *cookie;
 184         uint16_t used_idx, desc_idx;
 185         uint16_t i;
 186
 187         /*  Caller does the check */
 188         for (i = 0; i < num ; i++) {
 189                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
 190                 uep = &vq->vq_split.ring.used->ring[used_idx];
 191                 desc_idx = (uint16_t) uep->id;
 192                 len[i] = uep->len;
 193                 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
 194
 195                 if (unlikely(cookie == NULL)) {
 196                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 197                                 vq->vq_used_cons_idx);
 198                         break;
 199                 }
 200
 201                 rte_prefetch0(cookie);
 202                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 203                 rx_pkts[i]  = cookie;
 204                 vq->vq_used_cons_idx++;
 205                 vq_ring_free_chain(vq, desc_idx);
 206                 vq->vq_descx[desc_idx].cookie = NULL;
 207         }
 208
 209         return i;
 210 }
 211
 212 static uint16_t
 213 virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
 214                         struct rte_mbuf **rx_pkts,
 215                         uint32_t *len,
 216                         uint16_t num)
 217 {
 218         struct vring_used_elem *uep;
 219         struct rte_mbuf *cookie;
 220         uint16_t used_idx = 0;
 221         uint16_t i;
 222
 223         if (unlikely(num == 0))
 224                 return 0;
 225
 226         for (i = 0; i < num; i++) {
 227                 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
 228                 /* Desc idx same as used idx */
 229                 uep = &vq->vq_split.ring.used->ring[used_idx];
 230                 len[i] = uep->len;
 231                 cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
 232
 233                 if (unlikely(cookie == NULL)) {
 234                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 235                                 vq->vq_used_cons_idx);
 236                         break;
 237                 }
 238
 239                 rte_prefetch0(cookie);
 240                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 241                 rx_pkts[i]  = cookie;
 242                 vq->vq_used_cons_idx++;
 243                 vq->vq_descx[used_idx].cookie = NULL;
 244         }
 245
 246         vq_ring_free_inorder(vq, used_idx, i);
 247         return i;
 248 }
 249
 250 static inline int
 251 virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
 252                         struct rte_mbuf **cookies,
 253                         uint16_t num)
 254 {
 255         struct vq_desc_extra *dxp;
 256         struct virtio_hw *hw = vq->hw;
 257         struct vring_desc *start_dp;
 258         uint16_t head_idx, idx, i = 0;
 259
 260         if (unlikely(vq->vq_free_cnt == 0))
 261                 return -ENOSPC;
 262         if (unlikely(vq->vq_free_cnt < num))
 263                 return -EMSGSIZE;
 264
 265         head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
 266         start_dp = vq->vq_split.ring.desc;
 267
 268         while (i < num) {
 269                 idx = head_idx & (vq->vq_nentries - 1);
 270                 dxp = &vq->vq_descx[idx];
 271                 dxp->cookie = (void *)cookies[i];
 272                 dxp->ndescs = 1;
 273
 274                 start_dp[idx].addr =
 275                                 VIRTIO_MBUF_ADDR(cookies[i], vq) +
 276                                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 277                 start_dp[idx].len =
 278                                 cookies[i]->buf_len -
 279                                 RTE_PKTMBUF_HEADROOM +
 280                                 hw->vtnet_hdr_size;
 281                 start_dp[idx].flags =  VRING_DESC_F_WRITE;
 282
 283                 vq_update_avail_ring(vq, idx);
 284                 head_idx++;
 285                 i++;
 286         }
 287
 288         vq->vq_desc_head_idx += num;
 289         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 290         return 0;
 291 }
 292
 293 static inline int
 294 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf **cookie,
 295                                 uint16_t num)
 296 {
 297         struct vq_desc_extra *dxp;
 298         struct virtio_hw *hw = vq->hw;
 299         struct vring_desc *start_dp = vq->vq_split.ring.desc;
 300         uint16_t idx, i;
 301
 302         if (unlikely(vq->vq_free_cnt == 0))
 303                 return -ENOSPC;
 304         if (unlikely(vq->vq_free_cnt < num))
 305                 return -EMSGSIZE;
 306
 307         if (unlikely(vq->vq_desc_head_idx >= vq->vq_nentries))
 308                 return -EFAULT;
 309
 310         for (i = 0; i < num; i++) {
 311                 idx = vq->vq_desc_head_idx;
 312                 dxp = &vq->vq_descx[idx];
 313                 dxp->cookie = (void *)cookie[i];
 314                 dxp->ndescs = 1;
 315
 316                 start_dp[idx].addr =
 317                         VIRTIO_MBUF_ADDR(cookie[i], vq) +
 318                         RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 319                 start_dp[idx].len =
 320                         cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM +
 321                         hw->vtnet_hdr_size;
 322                 start_dp[idx].flags = VRING_DESC_F_WRITE;
 323                 vq->vq_desc_head_idx = start_dp[idx].next;
 324                 vq_update_avail_ring(vq, idx);
 325                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) {
 326                         vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
 327                         break;
 328                 }
 329         }
 330
 331         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 332
 333         return 0;
 334 }
 335
 336 static inline int
 337 virtqueue_enqueue_recv_refill_packed(struct virtqueue *vq,
 338                                      struct rte_mbuf **cookie, uint16_t num)
 339 {
 340         struct vring_packed_desc *start_dp = vq->vq_packed.ring.desc;
 341         uint16_t flags = vq->vq_packed.cached_flags;
 342         struct virtio_hw *hw = vq->hw;
 343         struct vq_desc_extra *dxp;
 344         uint16_t idx;
 345         int i;
 346
 347         if (unlikely(vq->vq_free_cnt == 0))
 348                 return -ENOSPC;
 349         if (unlikely(vq->vq_free_cnt < num))
 350                 return -EMSGSIZE;
 351
 352         for (i = 0; i < num; i++) {
 353                 idx = vq->vq_avail_idx;
 354                 dxp = &vq->vq_descx[idx];
 355                 dxp->cookie = (void *)cookie[i];
 356                 dxp->ndescs = 1;
 357
 358                 start_dp[idx].addr = VIRTIO_MBUF_ADDR(cookie[i], vq) +
 359                                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 360                 start_dp[idx].len = cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM
 361                                         + hw->vtnet_hdr_size;
 362
 363                 vq->vq_desc_head_idx = dxp->next;
 364                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 365                         vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
 366
 367                 virtqueue_store_flags_packed(&start_dp[idx], flags,
 368                                              hw->weak_barriers);
 369
 370                 if (++vq->vq_avail_idx >= vq->vq_nentries) {
 371                         vq->vq_avail_idx -= vq->vq_nentries;
 372                         vq->vq_packed.cached_flags ^=
 373                                 VRING_PACKED_DESC_F_AVAIL_USED;
 374                         flags = vq->vq_packed.cached_flags;
 375                 }
 376         }
 377         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 378         return 0;
 379 }
 380
 381 /* When doing TSO, the IP length is not included in the pseudo header
 382  * checksum of the packet given to the PMD, but for virtio it is
 383  * expected.
 384  */
 385 static void
 386 virtio_tso_fix_cksum(struct rte_mbuf *m)
 387 {
 388         /* common case: header is not fragmented */
 389         if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
 390                         m->l4_len)) {
 391                 struct rte_ipv4_hdr *iph;
 392                 struct rte_ipv6_hdr *ip6h;
 393                 struct rte_tcp_hdr *th;
 394                 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
 395                 uint32_t tmp;
 396
 397                 iph = rte_pktmbuf_mtod_offset(m,
 398                                         struct rte_ipv4_hdr *, m->l2_len);
 399                 th = RTE_PTR_ADD(iph, m->l3_len);
 400                 if ((iph->version_ihl >> 4) == 4) {
 401                         iph->hdr_checksum = 0;
 402                         iph->hdr_checksum = rte_ipv4_cksum(iph);
 403                         ip_len = iph->total_length;
 404                         ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
 405                                 m->l3_len);
 406                 } else {
 407                         ip6h = (struct rte_ipv6_hdr *)iph;
 408                         ip_paylen = ip6h->payload_len;
 409                 }
 410
 411                 /* calculate the new phdr checksum not including ip_paylen */
 412                 prev_cksum = th->cksum;
 413                 tmp = prev_cksum;
 414                 tmp += ip_paylen;
 415                 tmp = (tmp & 0xffff) + (tmp >> 16);
 416                 new_cksum = tmp;
 417
 418                 /* replace it in the packet */
 419                 th->cksum = new_cksum;
 420         }
 421 }
 422
 423
 424
 425
 426 static inline void
 427 virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
 428                         struct rte_mbuf **cookies,
 429                         uint16_t num)
 430 {
 431         struct vq_desc_extra *dxp;
 432         struct virtqueue *vq = txvq->vq;
 433         struct vring_desc *start_dp;
 434         struct virtio_net_hdr *hdr;
 435         uint16_t idx;
 436         int16_t head_size = vq->hw->vtnet_hdr_size;
 437         uint16_t i = 0;
 438
 439         idx = vq->vq_desc_head_idx;
 440         start_dp = vq->vq_split.ring.desc;
 441
 442         while (i < num) {
 443                 idx = idx & (vq->vq_nentries - 1);
 444                 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
 445                 dxp->cookie = (void *)cookies[i];
 446                 dxp->ndescs = 1;
 447                 virtio_update_packet_stats(&txvq->stats, cookies[i]);
 448
 449                 hdr = rte_pktmbuf_mtod_offset(cookies[i],
 450                                 struct virtio_net_hdr *, -head_size);
 451
 452                 /* if offload disabled, hdr is not zeroed yet, do it now */
 453                 if (!vq->hw->has_tx_offload)
 454                         virtqueue_clear_net_hdr(hdr);
 455                 else
 456                         virtqueue_xmit_offload(hdr, cookies[i], true);
 457
 458                 start_dp[idx].addr  =
 459                         VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq) - head_size;
 460                 start_dp[idx].len   = cookies[i]->data_len + head_size;
 461                 start_dp[idx].flags = 0;
 462
 463
 464                 vq_update_avail_ring(vq, idx);
 465
 466                 idx++;
 467                 i++;
 468         };
 469
 470         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 471         vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
 472 }
 473
 474 static inline void
 475 virtqueue_enqueue_xmit_packed_fast(struct virtnet_tx *txvq,
 476                                    struct rte_mbuf *cookie,
 477                                    int in_order)
 478 {
 479         struct virtqueue *vq = txvq->vq;
 480         struct vring_packed_desc *dp;
 481         struct vq_desc_extra *dxp;
 482         uint16_t idx, id, flags;
 483         int16_t head_size = vq->hw->vtnet_hdr_size;
 484         struct virtio_net_hdr *hdr;
 485
 486         id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
 487         idx = vq->vq_avail_idx;
 488         dp = &vq->vq_packed.ring.desc[idx];
 489
 490         dxp = &vq->vq_descx[id];
 491         dxp->ndescs = 1;
 492         dxp->cookie = cookie;
 493
 494         flags = vq->vq_packed.cached_flags;
 495
 496         /* prepend cannot fail, checked by caller */
 497         hdr = rte_pktmbuf_mtod_offset(cookie, struct virtio_net_hdr *,
 498                                       -head_size);
 499
 500         /* if offload disabled, hdr is not zeroed yet, do it now */
 501         if (!vq->hw->has_tx_offload)
 502                 virtqueue_clear_net_hdr(hdr);
 503         else
 504                 virtqueue_xmit_offload(hdr, cookie, true);
 505
 506         dp->addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq) - head_size;
 507         dp->len  = cookie->data_len + head_size;
 508         dp->id   = id;
 509
 510         if (++vq->vq_avail_idx >= vq->vq_nentries) {
 511                 vq->vq_avail_idx -= vq->vq_nentries;
 512                 vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED;
 513         }
 514
 515         vq->vq_free_cnt--;
 516
 517         if (!in_order) {
 518                 vq->vq_desc_head_idx = dxp->next;
 519                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 520                         vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
 521         }
 522
 523         virtqueue_store_flags_packed(dp, flags, vq->hw->weak_barriers);
 524 }
 525
 526 static inline void
 527 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 528                         uint16_t needed, int use_indirect, int can_push,
 529                         int in_order)
 530 {
 531         struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 532         struct vq_desc_extra *dxp;
 533         struct virtqueue *vq = txvq->vq;
 534         struct vring_desc *start_dp;
 535         uint16_t seg_num = cookie->nb_segs;
 536         uint16_t head_idx, idx;
 537         int16_t head_size = vq->hw->vtnet_hdr_size;
 538         bool prepend_header = false;
 539         struct virtio_net_hdr *hdr;
 540
 541         head_idx = vq->vq_desc_head_idx;
 542         idx = head_idx;
 543         if (in_order)
 544                 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
 545         else
 546                 dxp = &vq->vq_descx[idx];
 547         dxp->cookie = (void *)cookie;
 548         dxp->ndescs = needed;
 549
 550         start_dp = vq->vq_split.ring.desc;
 551
 552         if (can_push) {
 553                 /* prepend cannot fail, checked by caller */
 554                 hdr = rte_pktmbuf_mtod_offset(cookie, struct virtio_net_hdr *,
 555                                               -head_size);
 556                 prepend_header = true;
 557
 558                 /* if offload disabled, it is not zeroed below, do it now */
 559                 if (!vq->hw->has_tx_offload)
 560                         virtqueue_clear_net_hdr(hdr);
 561         } else if (use_indirect) {
 562                 /* setup tx ring slot to point to indirect
 563                  * descriptor list stored in reserved region.
 564                  *
 565                  * the first slot in indirect ring is already preset
 566                  * to point to the header in reserved region
 567                  */
 568                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 569                         RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
 570                 start_dp[idx].len   = (seg_num + 1) * sizeof(struct vring_desc);
 571                 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
 572                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 573
 574                 /* loop below will fill in rest of the indirect elements */
 575                 start_dp = txr[idx].tx_indir;
 576                 idx = 1;
 577         } else {
 578                 /* setup first tx ring slot to point to header
 579                  * stored in reserved region.
 580                  */
 581                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 582                         RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
 583                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
 584                 start_dp[idx].flags = VRING_DESC_F_NEXT;
 585                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 586
 587                 idx = start_dp[idx].next;
 588         }
 589
 590         virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
 591
 592         do {
 593                 start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 594                 start_dp[idx].len   = cookie->data_len;
 595                 if (prepend_header) {
 596                         start_dp[idx].addr -= head_size;
 597                         start_dp[idx].len += head_size;
 598                         prepend_header = false;
 599                 }
 600                 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 601                 idx = start_dp[idx].next;
 602         } while ((cookie = cookie->next) != NULL);
 603
 604         if (use_indirect)
 605                 idx = vq->vq_split.ring.desc[head_idx].next;
 606
 607         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 608
 609         vq->vq_desc_head_idx = idx;
 610         vq_update_avail_ring(vq, head_idx);
 611
 612         if (!in_order) {
 613                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 614                         vq->vq_desc_tail_idx = idx;
 615         }
 616 }
 617
 618 void
 619 virtio_dev_cq_start(struct rte_eth_dev *dev)
 620 {
 621         struct virtio_hw *hw = dev->data->dev_private;
 622
 623         if (hw->cvq && hw->cvq->vq) {
 624                 rte_spinlock_init(&hw->cvq->lock);
 625                 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
 626         }
 627 }
 628
 629 int
 630 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
 631                         uint16_t queue_idx,
 632                         uint16_t nb_desc,
 633                         unsigned int socket_id __rte_unused,
 634                         const struct rte_eth_rxconf *rx_conf,
 635                         struct rte_mempool *mp)
 636 {
 637         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 638         struct virtio_hw *hw = dev->data->dev_private;
 639         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 640         struct virtnet_rx *rxvq;
 641         uint16_t rx_free_thresh;
 642
 643         PMD_INIT_FUNC_TRACE();
 644
 645         if (rx_conf->rx_deferred_start) {
 646                 PMD_INIT_LOG(ERR, "Rx deferred start is not supported");
 647                 return -EINVAL;
 648         }
 649
 650         rx_free_thresh = rx_conf->rx_free_thresh;
 651         if (rx_free_thresh == 0)
 652                 rx_free_thresh =
 653                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_RX_FREE_THRESH);
 654
 655         if (rx_free_thresh & 0x3) {
 656                 RTE_LOG(ERR, PMD, "rx_free_thresh must be multiples of four."
 657                         " (rx_free_thresh=%u port=%u queue=%u)\n",
 658                         rx_free_thresh, dev->data->port_id, queue_idx);
 659                 return -EINVAL;
 660         }
 661
 662         if (rx_free_thresh >= vq->vq_nentries) {
 663                 RTE_LOG(ERR, PMD, "rx_free_thresh must be less than the "
 664                         "number of RX entries (%u)."
 665                         " (rx_free_thresh=%u port=%u queue=%u)\n",
 666                         vq->vq_nentries,
 667                         rx_free_thresh, dev->data->port_id, queue_idx);
 668                 return -EINVAL;
 669         }
 670         vq->vq_free_thresh = rx_free_thresh;
 671
 672         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
 673                 nb_desc = vq->vq_nentries;
 674         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 675
 676         rxvq = &vq->rxq;
 677         rxvq->queue_id = queue_idx;
 678         rxvq->mpool = mp;
 679         dev->data->rx_queues[queue_idx] = rxvq;
 680
 681         return 0;
 682 }
 683
 684 int
 685 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
 686 {
 687         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 688         struct virtio_hw *hw = dev->data->dev_private;
 689         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 690         struct virtnet_rx *rxvq = &vq->rxq;
 691         struct rte_mbuf *m;
 692         uint16_t desc_idx;
 693         int error, nbufs, i;
 694         bool in_order = vtpci_with_feature(hw, VIRTIO_F_IN_ORDER);
 695
 696         PMD_INIT_FUNC_TRACE();
 697
 698         /* Allocate blank mbufs for the each rx descriptor */
 699         nbufs = 0;
 700
 701         if (hw->use_vec_rx && !vtpci_packed_queue(hw)) {
 702                 for (desc_idx = 0; desc_idx < vq->vq_nentries;
 703                      desc_idx++) {
 704                         vq->vq_split.ring.avail->ring[desc_idx] = desc_idx;
 705                         vq->vq_split.ring.desc[desc_idx].flags =
 706                                 VRING_DESC_F_WRITE;
 707                 }
 708
 709                 virtio_rxq_vec_setup(rxvq);
 710         }
 711
 712         memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
 713         for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
 714              desc_idx++) {
 715                 vq->sw_ring[vq->vq_nentries + desc_idx] =
 716                         &rxvq->fake_mbuf;
 717         }
 718
 719         if (hw->use_vec_rx && !vtpci_packed_queue(hw)) {
 720                 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
 721                         virtio_rxq_rearm_vec(rxvq);
 722                         nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
 723                 }
 724         } else if (!vtpci_packed_queue(vq->hw) && in_order) {
 725                 if ((!virtqueue_full(vq))) {
 726                         uint16_t free_cnt = vq->vq_free_cnt;
 727                         struct rte_mbuf *pkts[free_cnt];
 728
 729                         if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
 730                                 free_cnt)) {
 731                                 error = virtqueue_enqueue_refill_inorder(vq,
 732                                                 pkts,
 733                                                 free_cnt);
 734                                 if (unlikely(error)) {
 735                                         for (i = 0; i < free_cnt; i++)
 736                                                 rte_pktmbuf_free(pkts[i]);
 737                                 }
 738                         }
 739
 740                         nbufs += free_cnt;
 741                         vq_update_avail_idx(vq);
 742                 }
 743         } else {
 744                 while (!virtqueue_full(vq)) {
 745                         m = rte_mbuf_raw_alloc(rxvq->mpool);
 746                         if (m == NULL)
 747                                 break;
 748
 749                         /* Enqueue allocated buffers */
 750                         if (vtpci_packed_queue(vq->hw))
 751                                 error = virtqueue_enqueue_recv_refill_packed(vq,
 752                                                 &m, 1);
 753                         else
 754                                 error = virtqueue_enqueue_recv_refill(vq,
 755                                                 &m, 1);
 756                         if (error) {
 757                                 rte_pktmbuf_free(m);
 758                                 break;
 759                         }
 760                         nbufs++;
 761                 }
 762
 763                 if (!vtpci_packed_queue(vq->hw))
 764                         vq_update_avail_idx(vq);
 765         }
 766
 767         PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
 768
 769         VIRTQUEUE_DUMP(vq);
 770
 771         return 0;
 772 }
 773
 774 /*
 775  * struct rte_eth_dev *dev: Used to update dev
 776  * uint16_t nb_desc: Defaults to values read from config space
 777  * unsigned int socket_id: Used to allocate memzone
 778  * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
 779  * uint16_t queue_idx: Just used as an index in dev txq list
 780  */
 781 int
 782 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 783                         uint16_t queue_idx,
 784                         uint16_t nb_desc,
 785                         unsigned int socket_id __rte_unused,
 786                         const struct rte_eth_txconf *tx_conf)
 787 {
 788         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 789         struct virtio_hw *hw = dev->data->dev_private;
 790         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 791         struct virtnet_tx *txvq;
 792         uint16_t tx_free_thresh;
 793
 794         PMD_INIT_FUNC_TRACE();
 795
 796         if (tx_conf->tx_deferred_start) {
 797                 PMD_INIT_LOG(ERR, "Tx deferred start is not supported");
 798                 return -EINVAL;
 799         }
 800
 801         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
 802                 nb_desc = vq->vq_nentries;
 803         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 804
 805         txvq = &vq->txq;
 806         txvq->queue_id = queue_idx;
 807
 808         tx_free_thresh = tx_conf->tx_free_thresh;
 809         if (tx_free_thresh == 0)
 810                 tx_free_thresh =
 811                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
 812
 813         if (tx_free_thresh >= (vq->vq_nentries - 3)) {
 814                 PMD_DRV_LOG(ERR, "tx_free_thresh must be less than the "
 815                         "number of TX entries minus 3 (%u)."
 816                         " (tx_free_thresh=%u port=%u queue=%u)\n",
 817                         vq->vq_nentries - 3,
 818                         tx_free_thresh, dev->data->port_id, queue_idx);
 819                 return -EINVAL;
 820         }
 821
 822         vq->vq_free_thresh = tx_free_thresh;
 823
 824         dev->data->tx_queues[queue_idx] = txvq;
 825         return 0;
 826 }
 827
 828 int
 829 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
 830                                 uint16_t queue_idx)
 831 {
 832         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 833         struct virtio_hw *hw = dev->data->dev_private;
 834         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 835
 836         PMD_INIT_FUNC_TRACE();
 837
 838         if (!vtpci_packed_queue(hw)) {
 839                 if (vtpci_with_feature(hw, VIRTIO_F_IN_ORDER))
 840                         vq->vq_split.ring.desc[vq->vq_nentries - 1].next = 0;
 841         }
 842
 843         VIRTQUEUE_DUMP(vq);
 844
 845         return 0;
 846 }
 847
 848 static inline void
 849 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
 850 {
 851         int error;
 852         /*
 853          * Requeue the discarded mbuf. This should always be
 854          * successful since it was just dequeued.
 855          */
 856         if (vtpci_packed_queue(vq->hw))
 857                 error = virtqueue_enqueue_recv_refill_packed(vq, &m, 1);
 858         else
 859                 error = virtqueue_enqueue_recv_refill(vq, &m, 1);
 860
 861         if (unlikely(error)) {
 862                 PMD_DRV_LOG(ERR, "cannot requeue discarded mbuf");
 863                 rte_pktmbuf_free(m);
 864         }
 865 }
 866
 867 static inline void
 868 virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
 869 {
 870         int error;
 871
 872         error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
 873         if (unlikely(error)) {
 874                 PMD_DRV_LOG(ERR, "cannot requeue discarded mbuf");
 875                 rte_pktmbuf_free(m);
 876         }
 877 }
 878
 879 /* Optionally fill offload information in structure */
 880 static inline int
 881 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
 882 {
 883         struct rte_net_hdr_lens hdr_lens;
 884         uint32_t hdrlen, ptype;
 885         int l4_supported = 0;
 886
 887         /* nothing to do */
 888         if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
 889                 return 0;
 890
 891         m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
 892
 893         ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
 894         m->packet_type = ptype;
 895         if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
 896             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
 897             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
 898                 l4_supported = 1;
 899
 900         if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
 901                 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
 902                 if (hdr->csum_start <= hdrlen && l4_supported) {
 903                         m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
 904                 } else {
 905                         /* Unknown proto or tunnel, do sw cksum. We can assume
 906                          * the cksum field is in the first segment since the
 907                          * buffers we provided to the host are large enough.
 908                          * In case of SCTP, this will be wrong since it's a CRC
 909                          * but there's nothing we can do.
 910                          */
 911                         uint16_t csum = 0, off;
 912
 913                         rte_raw_cksum_mbuf(m, hdr->csum_start,
 914                                 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
 915                                 &csum);
 916                         if (likely(csum != 0xffff))
 917                                 csum = ~csum;
 918                         off = hdr->csum_offset + hdr->csum_start;
 919                         if (rte_pktmbuf_data_len(m) >= off + 1)
 920                                 *rte_pktmbuf_mtod_offset(m, uint16_t *,
 921                                         off) = csum;
 922                 }
 923         } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
 924                 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
 925         }
 926
 927         /* GSO request, save required information in mbuf */
 928         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
 929                 /* Check unsupported modes */
 930                 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
 931                     (hdr->gso_size == 0)) {
 932                         return -EINVAL;
 933                 }
 934
 935                 /* Update mss lengthes in mbuf */
 936                 m->tso_segsz = hdr->gso_size;
 937                 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
 938                         case VIRTIO_NET_HDR_GSO_TCPV4:
 939                         case VIRTIO_NET_HDR_GSO_TCPV6:
 940                                 m->ol_flags |= PKT_RX_LRO | \
 941                                         PKT_RX_L4_CKSUM_NONE;
 942                                 break;
 943                         default:
 944                                 return -EINVAL;
 945                 }
 946         }
 947
 948         return 0;
 949 }
 950
 951 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
 952 uint16_t
 953 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 954 {
 955         struct virtnet_rx *rxvq = rx_queue;
 956         struct virtqueue *vq = rxvq->vq;
 957         struct virtio_hw *hw = vq->hw;
 958         struct rte_mbuf *rxm;
 959         uint16_t nb_used, num, nb_rx;
 960         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 961         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 962         int error;
 963         uint32_t i, nb_enqueued;
 964         uint32_t hdr_size;
 965         struct virtio_net_hdr *hdr;
 966
 967         nb_rx = 0;
 968         if (unlikely(hw->started == 0))
 969                 return nb_rx;
 970
 971         nb_used = virtqueue_nused(vq);
 972
 973         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
 974         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
 975                 num = VIRTIO_MBUF_BURST_SZ;
 976         if (likely(num > DESC_PER_CACHELINE))
 977                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
 978
 979         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
 980         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
 981
 982         nb_enqueued = 0;
 983         hdr_size = hw->vtnet_hdr_size;
 984
 985         for (i = 0; i < num ; i++) {
 986                 rxm = rcv_pkts[i];
 987
 988                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
 989
 990                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
 991                         PMD_RX_LOG(ERR, "Packet drop");
 992                         nb_enqueued++;
 993                         virtio_discard_rxbuf(vq, rxm);
 994                         rxvq->stats.errors++;
 995                         continue;
 996                 }
 997
 998                 rxm->port = rxvq->port_id;
 999                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1000                 rxm->ol_flags = 0;
1001                 rxm->vlan_tci = 0;
1002
1003                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1004                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1005
1006                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1007                         RTE_PKTMBUF_HEADROOM - hdr_size);
1008
1009                 if (hw->vlan_strip)
1010                         rte_vlan_strip(rxm);
1011
1012                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1013                         virtio_discard_rxbuf(vq, rxm);
1014                         rxvq->stats.errors++;
1015                         continue;
1016                 }
1017
1018                 virtio_rx_stats_updated(rxvq, rxm);
1019
1020                 rx_pkts[nb_rx++] = rxm;
1021         }
1022
1023         rxvq->stats.packets += nb_rx;
1024
1025         /* Allocate new mbuf for the used descriptor */
1026         if (likely(!virtqueue_full(vq))) {
1027                 uint16_t free_cnt = vq->vq_free_cnt;
1028                 struct rte_mbuf *new_pkts[free_cnt];
1029
1030                 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1031                                                 free_cnt) == 0)) {
1032                         error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1033                                         free_cnt);
1034                         if (unlikely(error)) {
1035                                 for (i = 0; i < free_cnt; i++)
1036                                         rte_pktmbuf_free(new_pkts[i]);
1037                         }
1038                         nb_enqueued += free_cnt;
1039                 } else {
1040                         struct rte_eth_dev *dev =
1041                                 &rte_eth_devices[rxvq->port_id];
1042                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1043                 }
1044         }
1045
1046         if (likely(nb_enqueued)) {
1047                 vq_update_avail_idx(vq);
1048
1049                 if (unlikely(virtqueue_kick_prepare(vq))) {
1050                         virtqueue_notify(vq);
1051                         PMD_RX_LOG(DEBUG, "Notified");
1052                 }
1053         }
1054
1055         return nb_rx;
1056 }
1057
1058 uint16_t
1059 virtio_recv_pkts_packed(void *rx_queue, struct rte_mbuf **rx_pkts,
1060                         uint16_t nb_pkts)
1061 {
1062         struct virtnet_rx *rxvq = rx_queue;
1063         struct virtqueue *vq = rxvq->vq;
1064         struct virtio_hw *hw = vq->hw;
1065         struct rte_mbuf *rxm;
1066         uint16_t num, nb_rx;
1067         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1068         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1069         int error;
1070         uint32_t i, nb_enqueued;
1071         uint32_t hdr_size;
1072         struct virtio_net_hdr *hdr;
1073
1074         nb_rx = 0;
1075         if (unlikely(hw->started == 0))
1076                 return nb_rx;
1077
1078         num = RTE_MIN(VIRTIO_MBUF_BURST_SZ, nb_pkts);
1079         if (likely(num > DESC_PER_CACHELINE))
1080                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1081
1082         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1083         PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1084
1085         nb_enqueued = 0;
1086         hdr_size = hw->vtnet_hdr_size;
1087
1088         for (i = 0; i < num; i++) {
1089                 rxm = rcv_pkts[i];
1090
1091                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1092
1093                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1094                         PMD_RX_LOG(ERR, "Packet drop");
1095                         nb_enqueued++;
1096                         virtio_discard_rxbuf(vq, rxm);
1097                         rxvq->stats.errors++;
1098                         continue;
1099                 }
1100
1101                 rxm->port = rxvq->port_id;
1102                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1103                 rxm->ol_flags = 0;
1104                 rxm->vlan_tci = 0;
1105
1106                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1107                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1108
1109                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1110                         RTE_PKTMBUF_HEADROOM - hdr_size);
1111
1112                 if (hw->vlan_strip)
1113                         rte_vlan_strip(rxm);
1114
1115                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1116                         virtio_discard_rxbuf(vq, rxm);
1117                         rxvq->stats.errors++;
1118                         continue;
1119                 }
1120
1121                 virtio_rx_stats_updated(rxvq, rxm);
1122
1123                 rx_pkts[nb_rx++] = rxm;
1124         }
1125
1126         rxvq->stats.packets += nb_rx;
1127
1128         /* Allocate new mbuf for the used descriptor */
1129         if (likely(!virtqueue_full(vq))) {
1130                 uint16_t free_cnt = vq->vq_free_cnt;
1131                 struct rte_mbuf *new_pkts[free_cnt];
1132
1133                 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1134                                                 free_cnt) == 0)) {
1135                         error = virtqueue_enqueue_recv_refill_packed(vq,
1136                                         new_pkts, free_cnt);
1137                         if (unlikely(error)) {
1138                                 for (i = 0; i < free_cnt; i++)
1139                                         rte_pktmbuf_free(new_pkts[i]);
1140                         }
1141                         nb_enqueued += free_cnt;
1142                 } else {
1143                         struct rte_eth_dev *dev =
1144                                 &rte_eth_devices[rxvq->port_id];
1145                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1146                 }
1147         }
1148
1149         if (likely(nb_enqueued)) {
1150                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1151                         virtqueue_notify(vq);
1152                         PMD_RX_LOG(DEBUG, "Notified");
1153                 }
1154         }
1155
1156         return nb_rx;
1157 }
1158
1159
1160 uint16_t
1161 virtio_recv_pkts_inorder(void *rx_queue,
1162                         struct rte_mbuf **rx_pkts,
1163                         uint16_t nb_pkts)
1164 {
1165         struct virtnet_rx *rxvq = rx_queue;
1166         struct virtqueue *vq = rxvq->vq;
1167         struct virtio_hw *hw = vq->hw;
1168         struct rte_mbuf *rxm;
1169         struct rte_mbuf *prev = NULL;
1170         uint16_t nb_used, num, nb_rx;
1171         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1172         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1173         int error;
1174         uint32_t nb_enqueued;
1175         uint32_t seg_num;
1176         uint32_t seg_res;
1177         uint32_t hdr_size;
1178         int32_t i;
1179
1180         nb_rx = 0;
1181         if (unlikely(hw->started == 0))
1182                 return nb_rx;
1183
1184         nb_used = virtqueue_nused(vq);
1185         nb_used = RTE_MIN(nb_used, nb_pkts);
1186         nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ);
1187
1188         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1189
1190         nb_enqueued = 0;
1191         seg_num = 1;
1192         seg_res = 0;
1193         hdr_size = hw->vtnet_hdr_size;
1194
1195         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
1196
1197         for (i = 0; i < num; i++) {
1198                 struct virtio_net_hdr_mrg_rxbuf *header;
1199
1200                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1201                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1202
1203                 rxm = rcv_pkts[i];
1204
1205                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1206                         PMD_RX_LOG(ERR, "Packet drop");
1207                         nb_enqueued++;
1208                         virtio_discard_rxbuf_inorder(vq, rxm);
1209                         rxvq->stats.errors++;
1210                         continue;
1211                 }
1212
1213                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1214                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1215                          - hdr_size);
1216
1217                 if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
1218                         seg_num = header->num_buffers;
1219                         if (seg_num == 0)
1220                                 seg_num = 1;
1221                 } else {
1222                         seg_num = 1;
1223                 }
1224
1225                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1226                 rxm->nb_segs = seg_num;
1227                 rxm->ol_flags = 0;
1228                 rxm->vlan_tci = 0;
1229                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1230                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1231
1232                 rxm->port = rxvq->port_id;
1233
1234                 rx_pkts[nb_rx] = rxm;
1235                 prev = rxm;
1236
1237                 if (vq->hw->has_rx_offload &&
1238                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1239                         virtio_discard_rxbuf_inorder(vq, rxm);
1240                         rxvq->stats.errors++;
1241                         continue;
1242                 }
1243
1244                 if (hw->vlan_strip)
1245                         rte_vlan_strip(rx_pkts[nb_rx]);
1246
1247                 seg_res = seg_num - 1;
1248
1249                 /* Merge remaining segments */
1250                 while (seg_res != 0 && i < (num - 1)) {
1251                         i++;
1252
1253                         rxm = rcv_pkts[i];
1254                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1255                         rxm->pkt_len = (uint32_t)(len[i]);
1256                         rxm->data_len = (uint16_t)(len[i]);
1257
1258                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1259
1260                         prev->next = rxm;
1261                         prev = rxm;
1262                         seg_res -= 1;
1263                 }
1264
1265                 if (!seg_res) {
1266                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1267                         nb_rx++;
1268                 }
1269         }
1270
1271         /* Last packet still need merge segments */
1272         while (seg_res != 0) {
1273                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1274                                         VIRTIO_MBUF_BURST_SZ);
1275
1276                 if (likely(virtqueue_nused(vq) >= rcv_cnt)) {
1277                         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
1278                                                            rcv_cnt);
1279                         uint16_t extra_idx = 0;
1280
1281                         rcv_cnt = num;
1282                         while (extra_idx < rcv_cnt) {
1283                                 rxm = rcv_pkts[extra_idx];
1284                                 rxm->data_off =
1285                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1286                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1287                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1288                                 prev->next = rxm;
1289                                 prev = rxm;
1290                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1291                                 extra_idx += 1;
1292                         };
1293                         seg_res -= rcv_cnt;
1294
1295                         if (!seg_res) {
1296                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1297                                 nb_rx++;
1298                         }
1299                 } else {
1300                         PMD_RX_LOG(ERR,
1301                                         "No enough segments for packet.");
1302                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1303                         rxvq->stats.errors++;
1304                         break;
1305                 }
1306         }
1307
1308         rxvq->stats.packets += nb_rx;
1309
1310         /* Allocate new mbuf for the used descriptor */
1311
1312         if (likely(!virtqueue_full(vq))) {
1313                 /* free_cnt may include mrg descs */
1314                 uint16_t free_cnt = vq->vq_free_cnt;
1315                 struct rte_mbuf *new_pkts[free_cnt];
1316
1317                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1318                         error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
1319                                         free_cnt);
1320                         if (unlikely(error)) {
1321                                 for (i = 0; i < free_cnt; i++)
1322                                         rte_pktmbuf_free(new_pkts[i]);
1323                         }
1324                         nb_enqueued += free_cnt;
1325                 } else {
1326                         struct rte_eth_dev *dev =
1327                                 &rte_eth_devices[rxvq->port_id];
1328                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1329                 }
1330         }
1331
1332         if (likely(nb_enqueued)) {
1333                 vq_update_avail_idx(vq);
1334
1335                 if (unlikely(virtqueue_kick_prepare(vq))) {
1336                         virtqueue_notify(vq);
1337                         PMD_RX_LOG(DEBUG, "Notified");
1338                 }
1339         }
1340
1341         return nb_rx;
1342 }
1343
1344 uint16_t
1345 virtio_recv_mergeable_pkts(void *rx_queue,
1346                         struct rte_mbuf **rx_pkts,
1347                         uint16_t nb_pkts)
1348 {
1349         struct virtnet_rx *rxvq = rx_queue;
1350         struct virtqueue *vq = rxvq->vq;
1351         struct virtio_hw *hw = vq->hw;
1352         struct rte_mbuf *rxm;
1353         struct rte_mbuf *prev = NULL;
1354         uint16_t nb_used, num, nb_rx = 0;
1355         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1356         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1357         int error;
1358         uint32_t nb_enqueued = 0;
1359         uint32_t seg_num = 0;
1360         uint32_t seg_res = 0;
1361         uint32_t hdr_size = hw->vtnet_hdr_size;
1362         int32_t i;
1363
1364         if (unlikely(hw->started == 0))
1365                 return nb_rx;
1366
1367         nb_used = virtqueue_nused(vq);
1368
1369         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1370
1371         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1372         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1373                 num = VIRTIO_MBUF_BURST_SZ;
1374         if (likely(num > DESC_PER_CACHELINE))
1375                 num = num - ((vq->vq_used_cons_idx + num) %
1376                                 DESC_PER_CACHELINE);
1377
1378
1379         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1380
1381         for (i = 0; i < num; i++) {
1382                 struct virtio_net_hdr_mrg_rxbuf *header;
1383
1384                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1385                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1386
1387                 rxm = rcv_pkts[i];
1388
1389                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1390                         PMD_RX_LOG(ERR, "Packet drop");
1391                         nb_enqueued++;
1392                         virtio_discard_rxbuf(vq, rxm);
1393                         rxvq->stats.errors++;
1394                         continue;
1395                 }
1396
1397                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1398                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1399                          - hdr_size);
1400                 seg_num = header->num_buffers;
1401                 if (seg_num == 0)
1402                         seg_num = 1;
1403
1404                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1405                 rxm->nb_segs = seg_num;
1406                 rxm->ol_flags = 0;
1407                 rxm->vlan_tci = 0;
1408                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1409                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1410
1411                 rxm->port = rxvq->port_id;
1412
1413                 rx_pkts[nb_rx] = rxm;
1414                 prev = rxm;
1415
1416                 if (hw->has_rx_offload &&
1417                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1418                         virtio_discard_rxbuf(vq, rxm);
1419                         rxvq->stats.errors++;
1420                         continue;
1421                 }
1422
1423                 if (hw->vlan_strip)
1424                         rte_vlan_strip(rx_pkts[nb_rx]);
1425
1426                 seg_res = seg_num - 1;
1427
1428                 /* Merge remaining segments */
1429                 while (seg_res != 0 && i < (num - 1)) {
1430                         i++;
1431
1432                         rxm = rcv_pkts[i];
1433                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1434                         rxm->pkt_len = (uint32_t)(len[i]);
1435                         rxm->data_len = (uint16_t)(len[i]);
1436
1437                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1438
1439                         prev->next = rxm;
1440                         prev = rxm;
1441                         seg_res -= 1;
1442                 }
1443
1444                 if (!seg_res) {
1445                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1446                         nb_rx++;
1447                 }
1448         }
1449
1450         /* Last packet still need merge segments */
1451         while (seg_res != 0) {
1452                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1453                                         VIRTIO_MBUF_BURST_SZ);
1454
1455                 if (likely(virtqueue_nused(vq) >= rcv_cnt)) {
1456                         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len,
1457                                                            rcv_cnt);
1458                         uint16_t extra_idx = 0;
1459
1460                         rcv_cnt = num;
1461                         while (extra_idx < rcv_cnt) {
1462                                 rxm = rcv_pkts[extra_idx];
1463                                 rxm->data_off =
1464                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1465                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1466                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1467                                 prev->next = rxm;
1468                                 prev = rxm;
1469                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1470                                 extra_idx += 1;
1471                         };
1472                         seg_res -= rcv_cnt;
1473
1474                         if (!seg_res) {
1475                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1476                                 nb_rx++;
1477                         }
1478                 } else {
1479                         PMD_RX_LOG(ERR,
1480                                         "No enough segments for packet.");
1481                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1482                         rxvq->stats.errors++;
1483                         break;
1484                 }
1485         }
1486
1487         rxvq->stats.packets += nb_rx;
1488
1489         /* Allocate new mbuf for the used descriptor */
1490         if (likely(!virtqueue_full(vq))) {
1491                 /* free_cnt may include mrg descs */
1492                 uint16_t free_cnt = vq->vq_free_cnt;
1493                 struct rte_mbuf *new_pkts[free_cnt];
1494
1495                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1496                         error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1497                                         free_cnt);
1498                         if (unlikely(error)) {
1499                                 for (i = 0; i < free_cnt; i++)
1500                                         rte_pktmbuf_free(new_pkts[i]);
1501                         }
1502                         nb_enqueued += free_cnt;
1503                 } else {
1504                         struct rte_eth_dev *dev =
1505                                 &rte_eth_devices[rxvq->port_id];
1506                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1507                 }
1508         }
1509
1510         if (likely(nb_enqueued)) {
1511                 vq_update_avail_idx(vq);
1512
1513                 if (unlikely(virtqueue_kick_prepare(vq))) {
1514                         virtqueue_notify(vq);
1515                         PMD_RX_LOG(DEBUG, "Notified");
1516                 }
1517         }
1518
1519         return nb_rx;
1520 }
1521
1522 uint16_t
1523 virtio_recv_mergeable_pkts_packed(void *rx_queue,
1524                         struct rte_mbuf **rx_pkts,
1525                         uint16_t nb_pkts)
1526 {
1527         struct virtnet_rx *rxvq = rx_queue;
1528         struct virtqueue *vq = rxvq->vq;
1529         struct virtio_hw *hw = vq->hw;
1530         struct rte_mbuf *rxm;
1531         struct rte_mbuf *prev = NULL;
1532         uint16_t num, nb_rx = 0;
1533         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1534         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1535         uint32_t nb_enqueued = 0;
1536         uint32_t seg_num = 0;
1537         uint32_t seg_res = 0;
1538         uint32_t hdr_size = hw->vtnet_hdr_size;
1539         int32_t i;
1540         int error;
1541
1542         if (unlikely(hw->started == 0))
1543                 return nb_rx;
1544
1545
1546         num = nb_pkts;
1547         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1548                 num = VIRTIO_MBUF_BURST_SZ;
1549         if (likely(num > DESC_PER_CACHELINE))
1550                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1551
1552         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1553
1554         for (i = 0; i < num; i++) {
1555                 struct virtio_net_hdr_mrg_rxbuf *header;
1556
1557                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1558                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1559
1560                 rxm = rcv_pkts[i];
1561
1562                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1563                         PMD_RX_LOG(ERR, "Packet drop");
1564                         nb_enqueued++;
1565                         virtio_discard_rxbuf(vq, rxm);
1566                         rxvq->stats.errors++;
1567                         continue;
1568                 }
1569
1570                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)
1571                           rxm->buf_addr + RTE_PKTMBUF_HEADROOM - hdr_size);
1572                 seg_num = header->num_buffers;
1573
1574                 if (seg_num == 0)
1575                         seg_num = 1;
1576
1577                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1578                 rxm->nb_segs = seg_num;
1579                 rxm->ol_flags = 0;
1580                 rxm->vlan_tci = 0;
1581                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1582                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1583
1584                 rxm->port = rxvq->port_id;
1585                 rx_pkts[nb_rx] = rxm;
1586                 prev = rxm;
1587
1588                 if (hw->has_rx_offload &&
1589                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1590                         virtio_discard_rxbuf(vq, rxm);
1591                         rxvq->stats.errors++;
1592                         continue;
1593                 }
1594
1595                 if (hw->vlan_strip)
1596                         rte_vlan_strip(rx_pkts[nb_rx]);
1597
1598                 seg_res = seg_num - 1;
1599
1600                 /* Merge remaining segments */
1601                 while (seg_res != 0 && i < (num - 1)) {
1602                         i++;
1603
1604                         rxm = rcv_pkts[i];
1605                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1606                         rxm->pkt_len = (uint32_t)(len[i]);
1607                         rxm->data_len = (uint16_t)(len[i]);
1608
1609                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1610
1611                         prev->next = rxm;
1612                         prev = rxm;
1613                         seg_res -= 1;
1614                 }
1615
1616                 if (!seg_res) {
1617                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1618                         nb_rx++;
1619                 }
1620         }
1621
1622         /* Last packet still need merge segments */
1623         while (seg_res != 0) {
1624                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1625                                         VIRTIO_MBUF_BURST_SZ);
1626                 uint16_t extra_idx = 0;
1627
1628                 rcv_cnt = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts,
1629                                 len, rcv_cnt);
1630                 if (unlikely(rcv_cnt == 0)) {
1631                         PMD_RX_LOG(ERR, "No enough segments for packet.");
1632                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1633                         rxvq->stats.errors++;
1634                         break;
1635                 }
1636
1637                 while (extra_idx < rcv_cnt) {
1638                         rxm = rcv_pkts[extra_idx];
1639
1640                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1641                         rxm->pkt_len = (uint32_t)(len[extra_idx]);
1642                         rxm->data_len = (uint16_t)(len[extra_idx]);
1643
1644                         prev->next = rxm;
1645                         prev = rxm;
1646                         rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1647                         extra_idx += 1;
1648                 }
1649                 seg_res -= rcv_cnt;
1650                 if (!seg_res) {
1651                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1652                         nb_rx++;
1653                 }
1654         }
1655
1656         rxvq->stats.packets += nb_rx;
1657
1658         /* Allocate new mbuf for the used descriptor */
1659         if (likely(!virtqueue_full(vq))) {
1660                 /* free_cnt may include mrg descs */
1661                 uint16_t free_cnt = vq->vq_free_cnt;
1662                 struct rte_mbuf *new_pkts[free_cnt];
1663
1664                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1665                         error = virtqueue_enqueue_recv_refill_packed(vq,
1666                                         new_pkts, free_cnt);
1667                         if (unlikely(error)) {
1668                                 for (i = 0; i < free_cnt; i++)
1669                                         rte_pktmbuf_free(new_pkts[i]);
1670                         }
1671                         nb_enqueued += free_cnt;
1672                 } else {
1673                         struct rte_eth_dev *dev =
1674                                 &rte_eth_devices[rxvq->port_id];
1675                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1676                 }
1677         }
1678
1679         if (likely(nb_enqueued)) {
1680                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1681                         virtqueue_notify(vq);
1682                         PMD_RX_LOG(DEBUG, "Notified");
1683                 }
1684         }
1685
1686         return nb_rx;
1687 }
1688
1689 uint16_t
1690 virtio_xmit_pkts_prepare(void *tx_queue __rte_unused, struct rte_mbuf **tx_pkts,
1691                         uint16_t nb_pkts)
1692 {
1693         uint16_t nb_tx;
1694         int error;
1695
1696         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1697                 struct rte_mbuf *m = tx_pkts[nb_tx];
1698
1699 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
1700                 error = rte_validate_tx_offload(m);
1701                 if (unlikely(error)) {
1702                         rte_errno = -error;
1703                         break;
1704                 }
1705 #endif
1706
1707                 /* Do VLAN tag insertion */
1708                 if (unlikely(m->ol_flags & PKT_TX_VLAN_PKT)) {
1709                         error = rte_vlan_insert(&m);
1710                         /* rte_vlan_insert() may change pointer
1711                          * even in the case of failure
1712                          */
1713                         tx_pkts[nb_tx] = m;
1714
1715                         if (unlikely(error)) {
1716                                 rte_errno = -error;
1717                                 break;
1718                         }
1719                 }
1720
1721                 error = rte_net_intel_cksum_prepare(m);
1722                 if (unlikely(error)) {
1723                         rte_errno = -error;
1724                         break;
1725                 }
1726
1727                 if (m->ol_flags & PKT_TX_TCP_SEG)
1728                         virtio_tso_fix_cksum(m);
1729         }
1730
1731         return nb_tx;
1732 }
1733
1734 uint16_t
1735 virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts,
1736                         uint16_t nb_pkts)
1737 {
1738         struct virtnet_tx *txvq = tx_queue;
1739         struct virtqueue *vq = txvq->vq;
1740         struct virtio_hw *hw = vq->hw;
1741         uint16_t hdr_size = hw->vtnet_hdr_size;
1742         uint16_t nb_tx = 0;
1743         bool in_order = vtpci_with_feature(hw, VIRTIO_F_IN_ORDER);
1744
1745         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1746                 return nb_tx;
1747
1748         if (unlikely(nb_pkts < 1))
1749                 return nb_pkts;
1750
1751         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1752
1753         if (nb_pkts > vq->vq_free_cnt)
1754                 virtio_xmit_cleanup_packed(vq, nb_pkts - vq->vq_free_cnt,
1755                                            in_order);
1756
1757         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1758                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1759                 int can_push = 0, slots, need;
1760
1761                 /* optimize ring usage */
1762                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1763                       vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1764                     rte_mbuf_refcnt_read(txm) == 1 &&
1765                     RTE_MBUF_DIRECT(txm) &&
1766                     txm->nb_segs == 1 &&
1767                     rte_pktmbuf_headroom(txm) >= hdr_size &&
1768                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1769                            __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1770                         can_push = 1;
1771
1772                 /* How many main ring entries are needed to this Tx?
1773                  * any_layout => number of segments
1774                  * default    => number of segments + 1
1775                  */
1776                 slots = txm->nb_segs + !can_push;
1777                 need = slots - vq->vq_free_cnt;
1778
1779                 /* Positive value indicates it need free vring descriptors */
1780                 if (unlikely(need > 0)) {
1781                         virtio_xmit_cleanup_packed(vq, need, in_order);
1782                         need = slots - vq->vq_free_cnt;
1783                         if (unlikely(need > 0)) {
1784                                 PMD_TX_LOG(ERR,
1785                                            "No free tx descriptors to transmit");
1786                                 break;
1787                         }
1788                 }
1789
1790                 /* Enqueue Packet buffers */
1791                 if (can_push)
1792                         virtqueue_enqueue_xmit_packed_fast(txvq, txm, in_order);
1793                 else
1794                         virtqueue_enqueue_xmit_packed(txvq, txm, slots, 0,
1795                                                       in_order);
1796
1797                 virtio_update_packet_stats(&txvq->stats, txm);
1798         }
1799
1800         txvq->stats.packets += nb_tx;
1801
1802         if (likely(nb_tx)) {
1803                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1804                         virtqueue_notify(vq);
1805                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1806                 }
1807         }
1808
1809         return nb_tx;
1810 }
1811
1812 uint16_t
1813 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
1814 {
1815         struct virtnet_tx *txvq = tx_queue;
1816         struct virtqueue *vq = txvq->vq;
1817         struct virtio_hw *hw = vq->hw;
1818         uint16_t hdr_size = hw->vtnet_hdr_size;
1819         uint16_t nb_used, nb_tx = 0;
1820
1821         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1822                 return nb_tx;
1823
1824         if (unlikely(nb_pkts < 1))
1825                 return nb_pkts;
1826
1827         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1828
1829         nb_used = virtqueue_nused(vq);
1830
1831         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1832                 virtio_xmit_cleanup(vq, nb_used);
1833
1834         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1835                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1836                 int can_push = 0, use_indirect = 0, slots, need;
1837
1838                 /* optimize ring usage */
1839                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1840                       vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1841                     rte_mbuf_refcnt_read(txm) == 1 &&
1842                     RTE_MBUF_DIRECT(txm) &&
1843                     txm->nb_segs == 1 &&
1844                     rte_pktmbuf_headroom(txm) >= hdr_size &&
1845                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1846                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1847                         can_push = 1;
1848                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1849                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1850                         use_indirect = 1;
1851
1852                 /* How many main ring entries are needed to this Tx?
1853                  * any_layout => number of segments
1854                  * indirect   => 1
1855                  * default    => number of segments + 1
1856                  */
1857                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1858                 need = slots - vq->vq_free_cnt;
1859
1860                 /* Positive value indicates it need free vring descriptors */
1861                 if (unlikely(need > 0)) {
1862                         nb_used = virtqueue_nused(vq);
1863
1864                         need = RTE_MIN(need, (int)nb_used);
1865
1866                         virtio_xmit_cleanup(vq, need);
1867                         need = slots - vq->vq_free_cnt;
1868                         if (unlikely(need > 0)) {
1869                                 PMD_TX_LOG(ERR,
1870                                            "No free tx descriptors to transmit");
1871                                 break;
1872                         }
1873                 }
1874
1875                 /* Enqueue Packet buffers */
1876                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
1877                         can_push, 0);
1878
1879                 virtio_update_packet_stats(&txvq->stats, txm);
1880         }
1881
1882         txvq->stats.packets += nb_tx;
1883
1884         if (likely(nb_tx)) {
1885                 vq_update_avail_idx(vq);
1886
1887                 if (unlikely(virtqueue_kick_prepare(vq))) {
1888                         virtqueue_notify(vq);
1889                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1890                 }
1891         }
1892
1893         return nb_tx;
1894 }
1895
1896 static __rte_always_inline int
1897 virtio_xmit_try_cleanup_inorder(struct virtqueue *vq, uint16_t need)
1898 {
1899         uint16_t nb_used, nb_clean, nb_descs;
1900
1901         nb_descs = vq->vq_free_cnt + need;
1902         nb_used = virtqueue_nused(vq);
1903         nb_clean = RTE_MIN(need, (int)nb_used);
1904
1905         virtio_xmit_cleanup_inorder(vq, nb_clean);
1906
1907         return nb_descs - vq->vq_free_cnt;
1908 }
1909
1910 uint16_t
1911 virtio_xmit_pkts_inorder(void *tx_queue,
1912                         struct rte_mbuf **tx_pkts,
1913                         uint16_t nb_pkts)
1914 {
1915         struct virtnet_tx *txvq = tx_queue;
1916         struct virtqueue *vq = txvq->vq;
1917         struct virtio_hw *hw = vq->hw;
1918         uint16_t hdr_size = hw->vtnet_hdr_size;
1919         uint16_t nb_used, nb_tx = 0, nb_inorder_pkts = 0;
1920         struct rte_mbuf *inorder_pkts[nb_pkts];
1921         int need;
1922
1923         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1924                 return nb_tx;
1925
1926         if (unlikely(nb_pkts < 1))
1927                 return nb_pkts;
1928
1929         VIRTQUEUE_DUMP(vq);
1930         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1931         nb_used = virtqueue_nused(vq);
1932
1933         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1934                 virtio_xmit_cleanup_inorder(vq, nb_used);
1935
1936         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1937                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1938                 int slots;
1939
1940                 /* optimize ring usage */
1941                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1942                      vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1943                      rte_mbuf_refcnt_read(txm) == 1 &&
1944                      RTE_MBUF_DIRECT(txm) &&
1945                      txm->nb_segs == 1 &&
1946                      rte_pktmbuf_headroom(txm) >= hdr_size &&
1947                      rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1948                                 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
1949                         inorder_pkts[nb_inorder_pkts] = txm;
1950                         nb_inorder_pkts++;
1951
1952                         continue;
1953                 }
1954
1955                 if (nb_inorder_pkts) {
1956                         need = nb_inorder_pkts - vq->vq_free_cnt;
1957                         if (unlikely(need > 0)) {
1958                                 need = virtio_xmit_try_cleanup_inorder(vq,
1959                                                                        need);
1960                                 if (unlikely(need > 0)) {
1961                                         PMD_TX_LOG(ERR,
1962                                                 "No free tx descriptors to "
1963                                                 "transmit");
1964                                         break;
1965                                 }
1966                         }
1967                         virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
1968                                                         nb_inorder_pkts);
1969                         nb_inorder_pkts = 0;
1970                 }
1971
1972                 slots = txm->nb_segs + 1;
1973                 need = slots - vq->vq_free_cnt;
1974                 if (unlikely(need > 0)) {
1975                         need = virtio_xmit_try_cleanup_inorder(vq, slots);
1976
1977                         if (unlikely(need > 0)) {
1978                                 PMD_TX_LOG(ERR,
1979                                         "No free tx descriptors to transmit");
1980                                 break;
1981                         }
1982                 }
1983                 /* Enqueue Packet buffers */
1984                 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
1985
1986                 virtio_update_packet_stats(&txvq->stats, txm);
1987         }
1988
1989         /* Transmit all inorder packets */
1990         if (nb_inorder_pkts) {
1991                 need = nb_inorder_pkts - vq->vq_free_cnt;
1992                 if (unlikely(need > 0)) {
1993                         need = virtio_xmit_try_cleanup_inorder(vq,
1994                                                                   need);
1995                         if (unlikely(need > 0)) {
1996                                 PMD_TX_LOG(ERR,
1997                                         "No free tx descriptors to transmit");
1998                                 nb_inorder_pkts = vq->vq_free_cnt;
1999                                 nb_tx -= need;
2000                         }
2001                 }
2002
2003                 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2004                                                 nb_inorder_pkts);
2005         }
2006
2007         txvq->stats.packets += nb_tx;
2008
2009         if (likely(nb_tx)) {
2010                 vq_update_avail_idx(vq);
2011
2012                 if (unlikely(virtqueue_kick_prepare(vq))) {
2013                         virtqueue_notify(vq);
2014                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2015                 }
2016         }
2017
2018         VIRTQUEUE_DUMP(vq);
2019
2020         return nb_tx;
2021 }
2022
2023 #ifndef CC_AVX512_SUPPORT
2024 uint16_t
2025 virtio_recv_pkts_packed_vec(void *rx_queue __rte_unused,
2026                             struct rte_mbuf **rx_pkts __rte_unused,
2027                             uint16_t nb_pkts __rte_unused)
2028 {
2029         return 0;
2030 }
2031
2032 uint16_t
2033 virtio_xmit_pkts_packed_vec(void *tx_queue __rte_unused,
2034                             struct rte_mbuf **tx_pkts __rte_unused,
2035                             uint16_t nb_pkts __rte_unused)
2036 {
2037         return 0;
2038 }
2039 #endif /* ifndef CC_AVX512_SUPPORT */