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_io_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                         if (rte_raw_cksum_mbuf(m, hdr->csum_start,
 914                                 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
 915                                 &csum) < 0)
 916                                 return -EINVAL;
 917                         if (likely(csum != 0xffff))
 918                                 csum = ~csum;
 919                         off = hdr->csum_offset + hdr->csum_start;
 920                         if (rte_pktmbuf_data_len(m) >= off + 1)
 921                                 *rte_pktmbuf_mtod_offset(m, uint16_t *,
 922                                         off) = csum;
 923                 }
 924         } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
 925                 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
 926         }
 927
 928         /* GSO request, save required information in mbuf */
 929         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
 930                 /* Check unsupported modes */
 931                 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
 932                     (hdr->gso_size == 0)) {
 933                         return -EINVAL;
 934                 }
 935
 936                 /* Update mss lengthes in mbuf */
 937                 m->tso_segsz = hdr->gso_size;
 938                 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
 939                         case VIRTIO_NET_HDR_GSO_TCPV4:
 940                         case VIRTIO_NET_HDR_GSO_TCPV6:
 941                                 m->ol_flags |= PKT_RX_LRO | \
 942                                         PKT_RX_L4_CKSUM_NONE;
 943                                 break;
 944                         default:
 945                                 return -EINVAL;
 946                 }
 947         }
 948
 949         return 0;
 950 }
 951
 952 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
 953 uint16_t
 954 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 955 {
 956         struct virtnet_rx *rxvq = rx_queue;
 957         struct virtqueue *vq = rxvq->vq;
 958         struct virtio_hw *hw = vq->hw;
 959         struct rte_mbuf *rxm;
 960         uint16_t nb_used, num, nb_rx;
 961         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 962         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 963         int error;
 964         uint32_t i, nb_enqueued;
 965         uint32_t hdr_size;
 966         struct virtio_net_hdr *hdr;
 967
 968         nb_rx = 0;
 969         if (unlikely(hw->started == 0))
 970                 return nb_rx;
 971
 972         nb_used = virtqueue_nused(vq);
 973
 974         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
 975         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
 976                 num = VIRTIO_MBUF_BURST_SZ;
 977         if (likely(num > DESC_PER_CACHELINE))
 978                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
 979
 980         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
 981         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
 982
 983         nb_enqueued = 0;
 984         hdr_size = hw->vtnet_hdr_size;
 985
 986         for (i = 0; i < num ; i++) {
 987                 rxm = rcv_pkts[i];
 988
 989                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
 990
 991                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
 992                         PMD_RX_LOG(ERR, "Packet drop");
 993                         nb_enqueued++;
 994                         virtio_discard_rxbuf(vq, rxm);
 995                         rxvq->stats.errors++;
 996                         continue;
 997                 }
 998
 999                 rxm->port = rxvq->port_id;
1000                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1001                 rxm->ol_flags = 0;
1002                 rxm->vlan_tci = 0;
1003
1004                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1005                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1006
1007                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1008                         RTE_PKTMBUF_HEADROOM - hdr_size);
1009
1010                 if (hw->vlan_strip)
1011                         rte_vlan_strip(rxm);
1012
1013                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1014                         virtio_discard_rxbuf(vq, rxm);
1015                         rxvq->stats.errors++;
1016                         continue;
1017                 }
1018
1019                 virtio_rx_stats_updated(rxvq, rxm);
1020
1021                 rx_pkts[nb_rx++] = rxm;
1022         }
1023
1024         rxvq->stats.packets += nb_rx;
1025
1026         /* Allocate new mbuf for the used descriptor */
1027         if (likely(!virtqueue_full(vq))) {
1028                 uint16_t free_cnt = vq->vq_free_cnt;
1029                 struct rte_mbuf *new_pkts[free_cnt];
1030
1031                 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1032                                                 free_cnt) == 0)) {
1033                         error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1034                                         free_cnt);
1035                         if (unlikely(error)) {
1036                                 for (i = 0; i < free_cnt; i++)
1037                                         rte_pktmbuf_free(new_pkts[i]);
1038                         }
1039                         nb_enqueued += free_cnt;
1040                 } else {
1041                         struct rte_eth_dev *dev =
1042                                 &rte_eth_devices[rxvq->port_id];
1043                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1044                 }
1045         }
1046
1047         if (likely(nb_enqueued)) {
1048                 vq_update_avail_idx(vq);
1049
1050                 if (unlikely(virtqueue_kick_prepare(vq))) {
1051                         virtqueue_notify(vq);
1052                         PMD_RX_LOG(DEBUG, "Notified");
1053                 }
1054         }
1055
1056         return nb_rx;
1057 }
1058
1059 uint16_t
1060 virtio_recv_pkts_packed(void *rx_queue, struct rte_mbuf **rx_pkts,
1061                         uint16_t nb_pkts)
1062 {
1063         struct virtnet_rx *rxvq = rx_queue;
1064         struct virtqueue *vq = rxvq->vq;
1065         struct virtio_hw *hw = vq->hw;
1066         struct rte_mbuf *rxm;
1067         uint16_t num, nb_rx;
1068         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1069         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1070         int error;
1071         uint32_t i, nb_enqueued;
1072         uint32_t hdr_size;
1073         struct virtio_net_hdr *hdr;
1074
1075         nb_rx = 0;
1076         if (unlikely(hw->started == 0))
1077                 return nb_rx;
1078
1079         num = RTE_MIN(VIRTIO_MBUF_BURST_SZ, nb_pkts);
1080         if (likely(num > DESC_PER_CACHELINE))
1081                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1082
1083         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1084         PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1085
1086         nb_enqueued = 0;
1087         hdr_size = hw->vtnet_hdr_size;
1088
1089         for (i = 0; i < num; i++) {
1090                 rxm = rcv_pkts[i];
1091
1092                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1093
1094                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1095                         PMD_RX_LOG(ERR, "Packet drop");
1096                         nb_enqueued++;
1097                         virtio_discard_rxbuf(vq, rxm);
1098                         rxvq->stats.errors++;
1099                         continue;
1100                 }
1101
1102                 rxm->port = rxvq->port_id;
1103                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1104                 rxm->ol_flags = 0;
1105                 rxm->vlan_tci = 0;
1106
1107                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1108                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1109
1110                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1111                         RTE_PKTMBUF_HEADROOM - hdr_size);
1112
1113                 if (hw->vlan_strip)
1114                         rte_vlan_strip(rxm);
1115
1116                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1117                         virtio_discard_rxbuf(vq, rxm);
1118                         rxvq->stats.errors++;
1119                         continue;
1120                 }
1121
1122                 virtio_rx_stats_updated(rxvq, rxm);
1123
1124                 rx_pkts[nb_rx++] = rxm;
1125         }
1126
1127         rxvq->stats.packets += nb_rx;
1128
1129         /* Allocate new mbuf for the used descriptor */
1130         if (likely(!virtqueue_full(vq))) {
1131                 uint16_t free_cnt = vq->vq_free_cnt;
1132                 struct rte_mbuf *new_pkts[free_cnt];
1133
1134                 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1135                                                 free_cnt) == 0)) {
1136                         error = virtqueue_enqueue_recv_refill_packed(vq,
1137                                         new_pkts, free_cnt);
1138                         if (unlikely(error)) {
1139                                 for (i = 0; i < free_cnt; i++)
1140                                         rte_pktmbuf_free(new_pkts[i]);
1141                         }
1142                         nb_enqueued += free_cnt;
1143                 } else {
1144                         struct rte_eth_dev *dev =
1145                                 &rte_eth_devices[rxvq->port_id];
1146                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1147                 }
1148         }
1149
1150         if (likely(nb_enqueued)) {
1151                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1152                         virtqueue_notify(vq);
1153                         PMD_RX_LOG(DEBUG, "Notified");
1154                 }
1155         }
1156
1157         return nb_rx;
1158 }
1159
1160
1161 uint16_t
1162 virtio_recv_pkts_inorder(void *rx_queue,
1163                         struct rte_mbuf **rx_pkts,
1164                         uint16_t nb_pkts)
1165 {
1166         struct virtnet_rx *rxvq = rx_queue;
1167         struct virtqueue *vq = rxvq->vq;
1168         struct virtio_hw *hw = vq->hw;
1169         struct rte_mbuf *rxm;
1170         struct rte_mbuf *prev = NULL;
1171         uint16_t nb_used, num, nb_rx;
1172         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1173         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1174         int error;
1175         uint32_t nb_enqueued;
1176         uint32_t seg_num;
1177         uint32_t seg_res;
1178         uint32_t hdr_size;
1179         int32_t i;
1180
1181         nb_rx = 0;
1182         if (unlikely(hw->started == 0))
1183                 return nb_rx;
1184
1185         nb_used = virtqueue_nused(vq);
1186         nb_used = RTE_MIN(nb_used, nb_pkts);
1187         nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ);
1188
1189         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1190
1191         nb_enqueued = 0;
1192         seg_num = 1;
1193         seg_res = 0;
1194         hdr_size = hw->vtnet_hdr_size;
1195
1196         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
1197
1198         for (i = 0; i < num; i++) {
1199                 struct virtio_net_hdr_mrg_rxbuf *header;
1200
1201                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1202                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1203
1204                 rxm = rcv_pkts[i];
1205
1206                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1207                         PMD_RX_LOG(ERR, "Packet drop");
1208                         nb_enqueued++;
1209                         virtio_discard_rxbuf_inorder(vq, rxm);
1210                         rxvq->stats.errors++;
1211                         continue;
1212                 }
1213
1214                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1215                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1216                          - hdr_size);
1217
1218                 if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
1219                         seg_num = header->num_buffers;
1220                         if (seg_num == 0)
1221                                 seg_num = 1;
1222                 } else {
1223                         seg_num = 1;
1224                 }
1225
1226                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1227                 rxm->nb_segs = seg_num;
1228                 rxm->ol_flags = 0;
1229                 rxm->vlan_tci = 0;
1230                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1231                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1232
1233                 rxm->port = rxvq->port_id;
1234
1235                 rx_pkts[nb_rx] = rxm;
1236                 prev = rxm;
1237
1238                 if (vq->hw->has_rx_offload &&
1239                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1240                         virtio_discard_rxbuf_inorder(vq, rxm);
1241                         rxvq->stats.errors++;
1242                         continue;
1243                 }
1244
1245                 if (hw->vlan_strip)
1246                         rte_vlan_strip(rx_pkts[nb_rx]);
1247
1248                 seg_res = seg_num - 1;
1249
1250                 /* Merge remaining segments */
1251                 while (seg_res != 0 && i < (num - 1)) {
1252                         i++;
1253
1254                         rxm = rcv_pkts[i];
1255                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1256                         rxm->pkt_len = (uint32_t)(len[i]);
1257                         rxm->data_len = (uint16_t)(len[i]);
1258
1259                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1260
1261                         prev->next = rxm;
1262                         prev = rxm;
1263                         seg_res -= 1;
1264                 }
1265
1266                 if (!seg_res) {
1267                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1268                         nb_rx++;
1269                 }
1270         }
1271
1272         /* Last packet still need merge segments */
1273         while (seg_res != 0) {
1274                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1275                                         VIRTIO_MBUF_BURST_SZ);
1276
1277                 if (likely(virtqueue_nused(vq) >= rcv_cnt)) {
1278                         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
1279                                                            rcv_cnt);
1280                         uint16_t extra_idx = 0;
1281
1282                         rcv_cnt = num;
1283                         while (extra_idx < rcv_cnt) {
1284                                 rxm = rcv_pkts[extra_idx];
1285                                 rxm->data_off =
1286                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1287                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1288                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1289                                 prev->next = rxm;
1290                                 prev = rxm;
1291                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1292                                 extra_idx += 1;
1293                         };
1294                         seg_res -= rcv_cnt;
1295
1296                         if (!seg_res) {
1297                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1298                                 nb_rx++;
1299                         }
1300                 } else {
1301                         PMD_RX_LOG(ERR,
1302                                         "No enough segments for packet.");
1303                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1304                         rxvq->stats.errors++;
1305                         break;
1306                 }
1307         }
1308
1309         rxvq->stats.packets += nb_rx;
1310
1311         /* Allocate new mbuf for the used descriptor */
1312
1313         if (likely(!virtqueue_full(vq))) {
1314                 /* free_cnt may include mrg descs */
1315                 uint16_t free_cnt = vq->vq_free_cnt;
1316                 struct rte_mbuf *new_pkts[free_cnt];
1317
1318                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1319                         error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
1320                                         free_cnt);
1321                         if (unlikely(error)) {
1322                                 for (i = 0; i < free_cnt; i++)
1323                                         rte_pktmbuf_free(new_pkts[i]);
1324                         }
1325                         nb_enqueued += free_cnt;
1326                 } else {
1327                         struct rte_eth_dev *dev =
1328                                 &rte_eth_devices[rxvq->port_id];
1329                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1330                 }
1331         }
1332
1333         if (likely(nb_enqueued)) {
1334                 vq_update_avail_idx(vq);
1335
1336                 if (unlikely(virtqueue_kick_prepare(vq))) {
1337                         virtqueue_notify(vq);
1338                         PMD_RX_LOG(DEBUG, "Notified");
1339                 }
1340         }
1341
1342         return nb_rx;
1343 }
1344
1345 uint16_t
1346 virtio_recv_mergeable_pkts(void *rx_queue,
1347                         struct rte_mbuf **rx_pkts,
1348                         uint16_t nb_pkts)
1349 {
1350         struct virtnet_rx *rxvq = rx_queue;
1351         struct virtqueue *vq = rxvq->vq;
1352         struct virtio_hw *hw = vq->hw;
1353         struct rte_mbuf *rxm;
1354         struct rte_mbuf *prev = NULL;
1355         uint16_t nb_used, num, nb_rx = 0;
1356         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1357         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1358         int error;
1359         uint32_t nb_enqueued = 0;
1360         uint32_t seg_num = 0;
1361         uint32_t seg_res = 0;
1362         uint32_t hdr_size = hw->vtnet_hdr_size;
1363         int32_t i;
1364
1365         if (unlikely(hw->started == 0))
1366                 return nb_rx;
1367
1368         nb_used = virtqueue_nused(vq);
1369
1370         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1371
1372         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1373         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1374                 num = VIRTIO_MBUF_BURST_SZ;
1375         if (likely(num > DESC_PER_CACHELINE))
1376                 num = num - ((vq->vq_used_cons_idx + num) %
1377                                 DESC_PER_CACHELINE);
1378
1379
1380         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1381
1382         for (i = 0; i < num; i++) {
1383                 struct virtio_net_hdr_mrg_rxbuf *header;
1384
1385                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1386                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1387
1388                 rxm = rcv_pkts[i];
1389
1390                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1391                         PMD_RX_LOG(ERR, "Packet drop");
1392                         nb_enqueued++;
1393                         virtio_discard_rxbuf(vq, rxm);
1394                         rxvq->stats.errors++;
1395                         continue;
1396                 }
1397
1398                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1399                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1400                          - hdr_size);
1401                 seg_num = header->num_buffers;
1402                 if (seg_num == 0)
1403                         seg_num = 1;
1404
1405                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1406                 rxm->nb_segs = seg_num;
1407                 rxm->ol_flags = 0;
1408                 rxm->vlan_tci = 0;
1409                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1410                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1411
1412                 rxm->port = rxvq->port_id;
1413
1414                 rx_pkts[nb_rx] = rxm;
1415                 prev = rxm;
1416
1417                 if (hw->has_rx_offload &&
1418                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1419                         virtio_discard_rxbuf(vq, rxm);
1420                         rxvq->stats.errors++;
1421                         continue;
1422                 }
1423
1424                 if (hw->vlan_strip)
1425                         rte_vlan_strip(rx_pkts[nb_rx]);
1426
1427                 seg_res = seg_num - 1;
1428
1429                 /* Merge remaining segments */
1430                 while (seg_res != 0 && i < (num - 1)) {
1431                         i++;
1432
1433                         rxm = rcv_pkts[i];
1434                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1435                         rxm->pkt_len = (uint32_t)(len[i]);
1436                         rxm->data_len = (uint16_t)(len[i]);
1437
1438                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1439
1440                         prev->next = rxm;
1441                         prev = rxm;
1442                         seg_res -= 1;
1443                 }
1444
1445                 if (!seg_res) {
1446                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1447                         nb_rx++;
1448                 }
1449         }
1450
1451         /* Last packet still need merge segments */
1452         while (seg_res != 0) {
1453                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1454                                         VIRTIO_MBUF_BURST_SZ);
1455
1456                 if (likely(virtqueue_nused(vq) >= rcv_cnt)) {
1457                         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len,
1458                                                            rcv_cnt);
1459                         uint16_t extra_idx = 0;
1460
1461                         rcv_cnt = num;
1462                         while (extra_idx < rcv_cnt) {
1463                                 rxm = rcv_pkts[extra_idx];
1464                                 rxm->data_off =
1465                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1466                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1467                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1468                                 prev->next = rxm;
1469                                 prev = rxm;
1470                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1471                                 extra_idx += 1;
1472                         };
1473                         seg_res -= rcv_cnt;
1474
1475                         if (!seg_res) {
1476                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1477                                 nb_rx++;
1478                         }
1479                 } else {
1480                         PMD_RX_LOG(ERR,
1481                                         "No enough segments for packet.");
1482                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1483                         rxvq->stats.errors++;
1484                         break;
1485                 }
1486         }
1487
1488         rxvq->stats.packets += nb_rx;
1489
1490         /* Allocate new mbuf for the used descriptor */
1491         if (likely(!virtqueue_full(vq))) {
1492                 /* free_cnt may include mrg descs */
1493                 uint16_t free_cnt = vq->vq_free_cnt;
1494                 struct rte_mbuf *new_pkts[free_cnt];
1495
1496                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1497                         error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1498                                         free_cnt);
1499                         if (unlikely(error)) {
1500                                 for (i = 0; i < free_cnt; i++)
1501                                         rte_pktmbuf_free(new_pkts[i]);
1502                         }
1503                         nb_enqueued += free_cnt;
1504                 } else {
1505                         struct rte_eth_dev *dev =
1506                                 &rte_eth_devices[rxvq->port_id];
1507                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1508                 }
1509         }
1510
1511         if (likely(nb_enqueued)) {
1512                 vq_update_avail_idx(vq);
1513
1514                 if (unlikely(virtqueue_kick_prepare(vq))) {
1515                         virtqueue_notify(vq);
1516                         PMD_RX_LOG(DEBUG, "Notified");
1517                 }
1518         }
1519
1520         return nb_rx;
1521 }
1522
1523 uint16_t
1524 virtio_recv_mergeable_pkts_packed(void *rx_queue,
1525                         struct rte_mbuf **rx_pkts,
1526                         uint16_t nb_pkts)
1527 {
1528         struct virtnet_rx *rxvq = rx_queue;
1529         struct virtqueue *vq = rxvq->vq;
1530         struct virtio_hw *hw = vq->hw;
1531         struct rte_mbuf *rxm;
1532         struct rte_mbuf *prev = NULL;
1533         uint16_t num, nb_rx = 0;
1534         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1535         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1536         uint32_t nb_enqueued = 0;
1537         uint32_t seg_num = 0;
1538         uint32_t seg_res = 0;
1539         uint32_t hdr_size = hw->vtnet_hdr_size;
1540         int32_t i;
1541         int error;
1542
1543         if (unlikely(hw->started == 0))
1544                 return nb_rx;
1545
1546
1547         num = nb_pkts;
1548         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1549                 num = VIRTIO_MBUF_BURST_SZ;
1550         if (likely(num > DESC_PER_CACHELINE))
1551                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1552
1553         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1554
1555         for (i = 0; i < num; i++) {
1556                 struct virtio_net_hdr_mrg_rxbuf *header;
1557
1558                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1559                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1560
1561                 rxm = rcv_pkts[i];
1562
1563                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1564                         PMD_RX_LOG(ERR, "Packet drop");
1565                         nb_enqueued++;
1566                         virtio_discard_rxbuf(vq, rxm);
1567                         rxvq->stats.errors++;
1568                         continue;
1569                 }
1570
1571                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)
1572                           rxm->buf_addr + RTE_PKTMBUF_HEADROOM - hdr_size);
1573                 seg_num = header->num_buffers;
1574
1575                 if (seg_num == 0)
1576                         seg_num = 1;
1577
1578                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1579                 rxm->nb_segs = seg_num;
1580                 rxm->ol_flags = 0;
1581                 rxm->vlan_tci = 0;
1582                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1583                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1584
1585                 rxm->port = rxvq->port_id;
1586                 rx_pkts[nb_rx] = rxm;
1587                 prev = rxm;
1588
1589                 if (hw->has_rx_offload &&
1590                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1591                         virtio_discard_rxbuf(vq, rxm);
1592                         rxvq->stats.errors++;
1593                         continue;
1594                 }
1595
1596                 if (hw->vlan_strip)
1597                         rte_vlan_strip(rx_pkts[nb_rx]);
1598
1599                 seg_res = seg_num - 1;
1600
1601                 /* Merge remaining segments */
1602                 while (seg_res != 0 && i < (num - 1)) {
1603                         i++;
1604
1605                         rxm = rcv_pkts[i];
1606                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1607                         rxm->pkt_len = (uint32_t)(len[i]);
1608                         rxm->data_len = (uint16_t)(len[i]);
1609
1610                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1611
1612                         prev->next = rxm;
1613                         prev = rxm;
1614                         seg_res -= 1;
1615                 }
1616
1617                 if (!seg_res) {
1618                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1619                         nb_rx++;
1620                 }
1621         }
1622
1623         /* Last packet still need merge segments */
1624         while (seg_res != 0) {
1625                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1626                                         VIRTIO_MBUF_BURST_SZ);
1627                 uint16_t extra_idx = 0;
1628
1629                 rcv_cnt = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts,
1630                                 len, rcv_cnt);
1631                 if (unlikely(rcv_cnt == 0)) {
1632                         PMD_RX_LOG(ERR, "No enough segments for packet.");
1633                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1634                         rxvq->stats.errors++;
1635                         break;
1636                 }
1637
1638                 while (extra_idx < rcv_cnt) {
1639                         rxm = rcv_pkts[extra_idx];
1640
1641                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1642                         rxm->pkt_len = (uint32_t)(len[extra_idx]);
1643                         rxm->data_len = (uint16_t)(len[extra_idx]);
1644
1645                         prev->next = rxm;
1646                         prev = rxm;
1647                         rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1648                         extra_idx += 1;
1649                 }
1650                 seg_res -= rcv_cnt;
1651                 if (!seg_res) {
1652                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1653                         nb_rx++;
1654                 }
1655         }
1656
1657         rxvq->stats.packets += nb_rx;
1658
1659         /* Allocate new mbuf for the used descriptor */
1660         if (likely(!virtqueue_full(vq))) {
1661                 /* free_cnt may include mrg descs */
1662                 uint16_t free_cnt = vq->vq_free_cnt;
1663                 struct rte_mbuf *new_pkts[free_cnt];
1664
1665                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1666                         error = virtqueue_enqueue_recv_refill_packed(vq,
1667                                         new_pkts, free_cnt);
1668                         if (unlikely(error)) {
1669                                 for (i = 0; i < free_cnt; i++)
1670                                         rte_pktmbuf_free(new_pkts[i]);
1671                         }
1672                         nb_enqueued += free_cnt;
1673                 } else {
1674                         struct rte_eth_dev *dev =
1675                                 &rte_eth_devices[rxvq->port_id];
1676                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1677                 }
1678         }
1679
1680         if (likely(nb_enqueued)) {
1681                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1682                         virtqueue_notify(vq);
1683                         PMD_RX_LOG(DEBUG, "Notified");
1684                 }
1685         }
1686
1687         return nb_rx;
1688 }
1689
1690 uint16_t
1691 virtio_xmit_pkts_prepare(void *tx_queue __rte_unused, struct rte_mbuf **tx_pkts,
1692                         uint16_t nb_pkts)
1693 {
1694         uint16_t nb_tx;
1695         int error;
1696
1697         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1698                 struct rte_mbuf *m = tx_pkts[nb_tx];
1699
1700 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
1701                 error = rte_validate_tx_offload(m);
1702                 if (unlikely(error)) {
1703                         rte_errno = -error;
1704                         break;
1705                 }
1706 #endif
1707
1708                 /* Do VLAN tag insertion */
1709                 if (unlikely(m->ol_flags & PKT_TX_VLAN_PKT)) {
1710                         error = rte_vlan_insert(&m);
1711                         /* rte_vlan_insert() may change pointer
1712                          * even in the case of failure
1713                          */
1714                         tx_pkts[nb_tx] = m;
1715
1716                         if (unlikely(error)) {
1717                                 rte_errno = -error;
1718                                 break;
1719                         }
1720                 }
1721
1722                 error = rte_net_intel_cksum_prepare(m);
1723                 if (unlikely(error)) {
1724                         rte_errno = -error;
1725                         break;
1726                 }
1727
1728                 if (m->ol_flags & PKT_TX_TCP_SEG)
1729                         virtio_tso_fix_cksum(m);
1730         }
1731
1732         return nb_tx;
1733 }
1734
1735 uint16_t
1736 virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts,
1737                         uint16_t nb_pkts)
1738 {
1739         struct virtnet_tx *txvq = tx_queue;
1740         struct virtqueue *vq = txvq->vq;
1741         struct virtio_hw *hw = vq->hw;
1742         uint16_t hdr_size = hw->vtnet_hdr_size;
1743         uint16_t nb_tx = 0;
1744         bool in_order = vtpci_with_feature(hw, VIRTIO_F_IN_ORDER);
1745
1746         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1747                 return nb_tx;
1748
1749         if (unlikely(nb_pkts < 1))
1750                 return nb_pkts;
1751
1752         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1753
1754         if (nb_pkts > vq->vq_free_cnt)
1755                 virtio_xmit_cleanup_packed(vq, nb_pkts - vq->vq_free_cnt,
1756                                            in_order);
1757
1758         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1759                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1760                 int can_push = 0, use_indirect = 0, slots, need;
1761
1762                 /* optimize ring usage */
1763                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1764                       vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1765                     rte_mbuf_refcnt_read(txm) == 1 &&
1766                     RTE_MBUF_DIRECT(txm) &&
1767                     txm->nb_segs == 1 &&
1768                     rte_pktmbuf_headroom(txm) >= hdr_size &&
1769                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1770                            __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1771                         can_push = 1;
1772                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1773                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1774                         use_indirect = 1;
1775                 /* How many main ring entries are needed to this Tx?
1776                  * indirect   => 1
1777                  * any_layout => number of segments
1778                  * default    => number of segments + 1
1779                  */
1780                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1781                 need = slots - vq->vq_free_cnt;
1782
1783                 /* Positive value indicates it need free vring descriptors */
1784                 if (unlikely(need > 0)) {
1785                         virtio_xmit_cleanup_packed(vq, need, in_order);
1786                         need = slots - vq->vq_free_cnt;
1787                         if (unlikely(need > 0)) {
1788                                 PMD_TX_LOG(ERR,
1789                                            "No free tx descriptors to transmit");
1790                                 break;
1791                         }
1792                 }
1793
1794                 /* Enqueue Packet buffers */
1795                 if (can_push)
1796                         virtqueue_enqueue_xmit_packed_fast(txvq, txm, in_order);
1797                 else
1798                         virtqueue_enqueue_xmit_packed(txvq, txm, slots,
1799                                                       use_indirect, 0,
1800                                                       in_order);
1801
1802                 virtio_update_packet_stats(&txvq->stats, txm);
1803         }
1804
1805         txvq->stats.packets += nb_tx;
1806
1807         if (likely(nb_tx)) {
1808                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1809                         virtqueue_notify(vq);
1810                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1811                 }
1812         }
1813
1814         return nb_tx;
1815 }
1816
1817 uint16_t
1818 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
1819 {
1820         struct virtnet_tx *txvq = tx_queue;
1821         struct virtqueue *vq = txvq->vq;
1822         struct virtio_hw *hw = vq->hw;
1823         uint16_t hdr_size = hw->vtnet_hdr_size;
1824         uint16_t nb_used, nb_tx = 0;
1825
1826         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1827                 return nb_tx;
1828
1829         if (unlikely(nb_pkts < 1))
1830                 return nb_pkts;
1831
1832         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1833
1834         nb_used = virtqueue_nused(vq);
1835
1836         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1837                 virtio_xmit_cleanup(vq, nb_used);
1838
1839         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1840                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1841                 int can_push = 0, use_indirect = 0, slots, need;
1842
1843                 /* optimize ring usage */
1844                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1845                       vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1846                     rte_mbuf_refcnt_read(txm) == 1 &&
1847                     RTE_MBUF_DIRECT(txm) &&
1848                     txm->nb_segs == 1 &&
1849                     rte_pktmbuf_headroom(txm) >= hdr_size &&
1850                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1851                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1852                         can_push = 1;
1853                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1854                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1855                         use_indirect = 1;
1856
1857                 /* How many main ring entries are needed to this Tx?
1858                  * any_layout => number of segments
1859                  * indirect   => 1
1860                  * default    => number of segments + 1
1861                  */
1862                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1863                 need = slots - vq->vq_free_cnt;
1864
1865                 /* Positive value indicates it need free vring descriptors */
1866                 if (unlikely(need > 0)) {
1867                         nb_used = virtqueue_nused(vq);
1868
1869                         need = RTE_MIN(need, (int)nb_used);
1870
1871                         virtio_xmit_cleanup(vq, need);
1872                         need = slots - vq->vq_free_cnt;
1873                         if (unlikely(need > 0)) {
1874                                 PMD_TX_LOG(ERR,
1875                                            "No free tx descriptors to transmit");
1876                                 break;
1877                         }
1878                 }
1879
1880                 /* Enqueue Packet buffers */
1881                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
1882                         can_push, 0);
1883
1884                 virtio_update_packet_stats(&txvq->stats, txm);
1885         }
1886
1887         txvq->stats.packets += nb_tx;
1888
1889         if (likely(nb_tx)) {
1890                 vq_update_avail_idx(vq);
1891
1892                 if (unlikely(virtqueue_kick_prepare(vq))) {
1893                         virtqueue_notify(vq);
1894                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1895                 }
1896         }
1897
1898         return nb_tx;
1899 }
1900
1901 static __rte_always_inline int
1902 virtio_xmit_try_cleanup_inorder(struct virtqueue *vq, uint16_t need)
1903 {
1904         uint16_t nb_used, nb_clean, nb_descs;
1905
1906         nb_descs = vq->vq_free_cnt + need;
1907         nb_used = virtqueue_nused(vq);
1908         nb_clean = RTE_MIN(need, (int)nb_used);
1909
1910         virtio_xmit_cleanup_inorder(vq, nb_clean);
1911
1912         return nb_descs - vq->vq_free_cnt;
1913 }
1914
1915 uint16_t
1916 virtio_xmit_pkts_inorder(void *tx_queue,
1917                         struct rte_mbuf **tx_pkts,
1918                         uint16_t nb_pkts)
1919 {
1920         struct virtnet_tx *txvq = tx_queue;
1921         struct virtqueue *vq = txvq->vq;
1922         struct virtio_hw *hw = vq->hw;
1923         uint16_t hdr_size = hw->vtnet_hdr_size;
1924         uint16_t nb_used, nb_tx = 0, nb_inorder_pkts = 0;
1925         struct rte_mbuf *inorder_pkts[nb_pkts];
1926         int need;
1927
1928         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1929                 return nb_tx;
1930
1931         if (unlikely(nb_pkts < 1))
1932                 return nb_pkts;
1933
1934         VIRTQUEUE_DUMP(vq);
1935         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1936         nb_used = virtqueue_nused(vq);
1937
1938         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1939                 virtio_xmit_cleanup_inorder(vq, nb_used);
1940
1941         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1942                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1943                 int slots;
1944
1945                 /* optimize ring usage */
1946                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1947                      vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1948                      rte_mbuf_refcnt_read(txm) == 1 &&
1949                      RTE_MBUF_DIRECT(txm) &&
1950                      txm->nb_segs == 1 &&
1951                      rte_pktmbuf_headroom(txm) >= hdr_size &&
1952                      rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1953                                 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
1954                         inorder_pkts[nb_inorder_pkts] = txm;
1955                         nb_inorder_pkts++;
1956
1957                         continue;
1958                 }
1959
1960                 if (nb_inorder_pkts) {
1961                         need = nb_inorder_pkts - vq->vq_free_cnt;
1962                         if (unlikely(need > 0)) {
1963                                 need = virtio_xmit_try_cleanup_inorder(vq,
1964                                                                        need);
1965                                 if (unlikely(need > 0)) {
1966                                         PMD_TX_LOG(ERR,
1967                                                 "No free tx descriptors to "
1968                                                 "transmit");
1969                                         break;
1970                                 }
1971                         }
1972                         virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
1973                                                         nb_inorder_pkts);
1974                         nb_inorder_pkts = 0;
1975                 }
1976
1977                 slots = txm->nb_segs + 1;
1978                 need = slots - vq->vq_free_cnt;
1979                 if (unlikely(need > 0)) {
1980                         need = virtio_xmit_try_cleanup_inorder(vq, slots);
1981
1982                         if (unlikely(need > 0)) {
1983                                 PMD_TX_LOG(ERR,
1984                                         "No free tx descriptors to transmit");
1985                                 break;
1986                         }
1987                 }
1988                 /* Enqueue Packet buffers */
1989                 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
1990
1991                 virtio_update_packet_stats(&txvq->stats, txm);
1992         }
1993
1994         /* Transmit all inorder packets */
1995         if (nb_inorder_pkts) {
1996                 need = nb_inorder_pkts - vq->vq_free_cnt;
1997                 if (unlikely(need > 0)) {
1998                         need = virtio_xmit_try_cleanup_inorder(vq,
1999                                                                   need);
2000                         if (unlikely(need > 0)) {
2001                                 PMD_TX_LOG(ERR,
2002                                         "No free tx descriptors to transmit");
2003                                 nb_inorder_pkts = vq->vq_free_cnt;
2004                                 nb_tx -= need;
2005                         }
2006                 }
2007
2008                 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2009                                                 nb_inorder_pkts);
2010         }
2011
2012         txvq->stats.packets += nb_tx;
2013
2014         if (likely(nb_tx)) {
2015                 vq_update_avail_idx(vq);
2016
2017                 if (unlikely(virtqueue_kick_prepare(vq))) {
2018                         virtqueue_notify(vq);
2019                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2020                 }
2021         }
2022
2023         VIRTQUEUE_DUMP(vq);
2024
2025         return nb_tx;
2026 }
2027
2028 __rte_weak uint16_t
2029 virtio_recv_pkts_packed_vec(void *rx_queue __rte_unused,
2030                             struct rte_mbuf **rx_pkts __rte_unused,
2031                             uint16_t nb_pkts __rte_unused)
2032 {
2033         return 0;
2034 }
2035
2036 __rte_weak uint16_t
2037 virtio_xmit_pkts_packed_vec(void *tx_queue __rte_unused,
2038                             struct rte_mbuf **tx_pkts __rte_unused,
2039                             uint16_t nb_pkts __rte_unused)
2040 {
2041         return 0;
2042 }