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