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 void
  43 vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num)
  44 {
  45         vq->vq_free_cnt += num;
  46         vq->vq_desc_tail_idx = desc_idx & (vq->vq_nentries - 1);
  47 }
  48
  49 void
  50 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
  51 {
  52         struct vring_desc *dp, *dp_tail;
  53         struct vq_desc_extra *dxp;
  54         uint16_t desc_idx_last = desc_idx;
  55
  56         dp  = &vq->vq_split.ring.desc[desc_idx];
  57         dxp = &vq->vq_descx[desc_idx];
  58         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
  59         if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
  60                 while (dp->flags & VRING_DESC_F_NEXT) {
  61                         desc_idx_last = dp->next;
  62                         dp = &vq->vq_split.ring.desc[dp->next];
  63                 }
  64         }
  65         dxp->ndescs = 0;
  66
  67         /*
  68          * We must append the existing free chain, if any, to the end of
  69          * newly freed chain. If the virtqueue was completely used, then
  70          * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
  71          */
  72         if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
  73                 vq->vq_desc_head_idx = desc_idx;
  74         } else {
  75                 dp_tail = &vq->vq_split.ring.desc[vq->vq_desc_tail_idx];
  76                 dp_tail->next = desc_idx;
  77         }
  78
  79         vq->vq_desc_tail_idx = desc_idx_last;
  80         dp->next = VQ_RING_DESC_CHAIN_END;
  81 }
  82
  83 void
  84 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
  85 {
  86         uint32_t s = mbuf->pkt_len;
  87         struct rte_ether_addr *ea;
  88
  89         stats->bytes += s;
  90
  91         if (s == 64) {
  92                 stats->size_bins[1]++;
  93         } else if (s > 64 && s < 1024) {
  94                 uint32_t bin;
  95
  96                 /* count zeros, and offset into correct bin */
  97                 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
  98                 stats->size_bins[bin]++;
  99         } else {
 100                 if (s < 64)
 101                         stats->size_bins[0]++;
 102                 else if (s < 1519)
 103                         stats->size_bins[6]++;
 104                 else
 105                         stats->size_bins[7]++;
 106         }
 107
 108         ea = rte_pktmbuf_mtod(mbuf, struct rte_ether_addr *);
 109         if (rte_is_multicast_ether_addr(ea)) {
 110                 if (rte_is_broadcast_ether_addr(ea))
 111                         stats->broadcast++;
 112                 else
 113                         stats->multicast++;
 114         }
 115 }
 116
 117 static inline void
 118 virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
 119 {
 120         VIRTIO_DUMP_PACKET(m, m->data_len);
 121
 122         virtio_update_packet_stats(&rxvq->stats, m);
 123 }
 124
 125 static uint16_t
 126 virtqueue_dequeue_burst_rx_packed(struct virtqueue *vq,
 127                                   struct rte_mbuf **rx_pkts,
 128                                   uint32_t *len,
 129                                   uint16_t num)
 130 {
 131         struct rte_mbuf *cookie;
 132         uint16_t used_idx;
 133         uint16_t id;
 134         struct vring_packed_desc *desc;
 135         uint16_t i;
 136
 137         desc = vq->vq_packed.ring.desc;
 138
 139         for (i = 0; i < num; i++) {
 140                 used_idx = vq->vq_used_cons_idx;
 141                 /* desc_is_used has a load-acquire or rte_io_rmb inside
 142                  * and wait for used desc in virtqueue.
 143                  */
 144                 if (!desc_is_used(&desc[used_idx], vq))
 145                         return i;
 146                 len[i] = desc[used_idx].len;
 147                 id = desc[used_idx].id;
 148                 cookie = (struct rte_mbuf *)vq->vq_descx[id].cookie;
 149                 if (unlikely(cookie == NULL)) {
 150                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 151                                 vq->vq_used_cons_idx);
 152                         break;
 153                 }
 154                 rte_prefetch0(cookie);
 155                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 156                 rx_pkts[i] = cookie;
 157
 158                 vq->vq_free_cnt++;
 159                 vq->vq_used_cons_idx++;
 160                 if (vq->vq_used_cons_idx >= vq->vq_nentries) {
 161                         vq->vq_used_cons_idx -= vq->vq_nentries;
 162                         vq->vq_packed.used_wrap_counter ^= 1;
 163                 }
 164         }
 165
 166         return i;
 167 }
 168
 169 static uint16_t
 170 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
 171                            uint32_t *len, uint16_t num)
 172 {
 173         struct vring_used_elem *uep;
 174         struct rte_mbuf *cookie;
 175         uint16_t used_idx, desc_idx;
 176         uint16_t i;
 177
 178         /*  Caller does the check */
 179         for (i = 0; i < num ; i++) {
 180                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
 181                 uep = &vq->vq_split.ring.used->ring[used_idx];
 182                 desc_idx = (uint16_t) uep->id;
 183                 len[i] = uep->len;
 184                 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
 185
 186                 if (unlikely(cookie == NULL)) {
 187                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 188                                 vq->vq_used_cons_idx);
 189                         break;
 190                 }
 191
 192                 rte_prefetch0(cookie);
 193                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 194                 rx_pkts[i]  = cookie;
 195                 vq->vq_used_cons_idx++;
 196                 vq_ring_free_chain(vq, desc_idx);
 197                 vq->vq_descx[desc_idx].cookie = NULL;
 198         }
 199
 200         return i;
 201 }
 202
 203 static uint16_t
 204 virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
 205                         struct rte_mbuf **rx_pkts,
 206                         uint32_t *len,
 207                         uint16_t num)
 208 {
 209         struct vring_used_elem *uep;
 210         struct rte_mbuf *cookie;
 211         uint16_t used_idx = 0;
 212         uint16_t i;
 213
 214         if (unlikely(num == 0))
 215                 return 0;
 216
 217         for (i = 0; i < num; i++) {
 218                 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
 219                 /* Desc idx same as used idx */
 220                 uep = &vq->vq_split.ring.used->ring[used_idx];
 221                 len[i] = uep->len;
 222                 cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
 223
 224                 if (unlikely(cookie == NULL)) {
 225                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 226                                 vq->vq_used_cons_idx);
 227                         break;
 228                 }
 229
 230                 rte_prefetch0(cookie);
 231                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 232                 rx_pkts[i]  = cookie;
 233                 vq->vq_used_cons_idx++;
 234                 vq->vq_descx[used_idx].cookie = NULL;
 235         }
 236
 237         vq_ring_free_inorder(vq, used_idx, i);
 238         return i;
 239 }
 240
 241 static inline int
 242 virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
 243                         struct rte_mbuf **cookies,
 244                         uint16_t num)
 245 {
 246         struct vq_desc_extra *dxp;
 247         struct virtio_hw *hw = vq->hw;
 248         struct vring_desc *start_dp;
 249         uint16_t head_idx, idx, i = 0;
 250
 251         if (unlikely(vq->vq_free_cnt == 0))
 252                 return -ENOSPC;
 253         if (unlikely(vq->vq_free_cnt < num))
 254                 return -EMSGSIZE;
 255
 256         head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
 257         start_dp = vq->vq_split.ring.desc;
 258
 259         while (i < num) {
 260                 idx = head_idx & (vq->vq_nentries - 1);
 261                 dxp = &vq->vq_descx[idx];
 262                 dxp->cookie = (void *)cookies[i];
 263                 dxp->ndescs = 1;
 264
 265                 start_dp[idx].addr = VIRTIO_MBUF_ADDR(cookies[i], vq) +
 266                         RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 267                 start_dp[idx].len = cookies[i]->buf_len -
 268                         RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
 269                 start_dp[idx].flags =  VRING_DESC_F_WRITE;
 270
 271                 vq_update_avail_ring(vq, idx);
 272                 head_idx++;
 273                 i++;
 274         }
 275
 276         vq->vq_desc_head_idx += num;
 277         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 278         return 0;
 279 }
 280
 281 static inline int
 282 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf **cookie,
 283                                 uint16_t num)
 284 {
 285         struct vq_desc_extra *dxp;
 286         struct virtio_hw *hw = vq->hw;
 287         struct vring_desc *start_dp = vq->vq_split.ring.desc;
 288         uint16_t idx, i;
 289
 290         if (unlikely(vq->vq_free_cnt == 0))
 291                 return -ENOSPC;
 292         if (unlikely(vq->vq_free_cnt < num))
 293                 return -EMSGSIZE;
 294
 295         if (unlikely(vq->vq_desc_head_idx >= vq->vq_nentries))
 296                 return -EFAULT;
 297
 298         for (i = 0; i < num; i++) {
 299                 idx = vq->vq_desc_head_idx;
 300                 dxp = &vq->vq_descx[idx];
 301                 dxp->cookie = (void *)cookie[i];
 302                 dxp->ndescs = 1;
 303
 304                 start_dp[idx].addr = VIRTIO_MBUF_ADDR(cookie[i], vq) +
 305                         RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 306                 start_dp[idx].len = cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM +
 307                         hw->vtnet_hdr_size;
 308                 start_dp[idx].flags = VRING_DESC_F_WRITE;
 309                 vq->vq_desc_head_idx = start_dp[idx].next;
 310                 vq_update_avail_ring(vq, idx);
 311                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) {
 312                         vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
 313                         break;
 314                 }
 315         }
 316
 317         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 318
 319         return 0;
 320 }
 321
 322 static inline void
 323 virtqueue_refill_single_packed(struct virtqueue *vq,
 324                                struct vring_packed_desc *dp,
 325                                struct rte_mbuf *cookie)
 326 {
 327         uint16_t flags = vq->vq_packed.cached_flags;
 328         struct virtio_hw *hw = vq->hw;
 329
 330         dp->addr = VIRTIO_MBUF_ADDR(cookie, vq) + RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 331         dp->len = cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
 332
 333         virtqueue_store_flags_packed(dp, flags, hw->weak_barriers);
 334
 335         if (++vq->vq_avail_idx >= vq->vq_nentries) {
 336                 vq->vq_avail_idx -= vq->vq_nentries;
 337                 vq->vq_packed.cached_flags ^=
 338                         VRING_PACKED_DESC_F_AVAIL_USED;
 339                 flags = vq->vq_packed.cached_flags;
 340         }
 341 }
 342
 343 static inline int
 344 virtqueue_enqueue_recv_refill_packed_init(struct virtqueue *vq,
 345                                      struct rte_mbuf **cookie, uint16_t num)
 346 {
 347         struct vring_packed_desc *start_dp = vq->vq_packed.ring.desc;
 348         struct vq_desc_extra *dxp;
 349         uint16_t idx;
 350         int i;
 351
 352         if (unlikely(vq->vq_free_cnt == 0))
 353                 return -ENOSPC;
 354         if (unlikely(vq->vq_free_cnt < num))
 355                 return -EMSGSIZE;
 356
 357         for (i = 0; i < num; i++) {
 358                 idx = vq->vq_avail_idx;
 359                 dxp = &vq->vq_descx[idx];
 360                 dxp->cookie = (void *)cookie[i];
 361                 dxp->ndescs = 1;
 362
 363                 virtqueue_refill_single_packed(vq, &start_dp[idx], cookie[i]);
 364         }
 365         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 366         return 0;
 367 }
 368
 369 static inline int
 370 virtqueue_enqueue_recv_refill_packed(struct virtqueue *vq,
 371                                      struct rte_mbuf **cookie, uint16_t num)
 372 {
 373         struct vring_packed_desc *start_dp = vq->vq_packed.ring.desc;
 374         struct vq_desc_extra *dxp;
 375         uint16_t idx, did;
 376         int i;
 377
 378         if (unlikely(vq->vq_free_cnt == 0))
 379                 return -ENOSPC;
 380         if (unlikely(vq->vq_free_cnt < num))
 381                 return -EMSGSIZE;
 382
 383         for (i = 0; i < num; i++) {
 384                 idx = vq->vq_avail_idx;
 385                 did = start_dp[idx].id;
 386                 dxp = &vq->vq_descx[did];
 387                 dxp->cookie = (void *)cookie[i];
 388                 dxp->ndescs = 1;
 389
 390                 virtqueue_refill_single_packed(vq, &start_dp[idx], cookie[i]);
 391         }
 392         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 393         return 0;
 394 }
 395
 396 /* When doing TSO, the IP length is not included in the pseudo header
 397  * checksum of the packet given to the PMD, but for virtio it is
 398  * expected.
 399  */
 400 static void
 401 virtio_tso_fix_cksum(struct rte_mbuf *m)
 402 {
 403         /* common case: header is not fragmented */
 404         if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
 405                         m->l4_len)) {
 406                 struct rte_ipv4_hdr *iph;
 407                 struct rte_ipv6_hdr *ip6h;
 408                 struct rte_tcp_hdr *th;
 409                 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
 410                 uint32_t tmp;
 411
 412                 iph = rte_pktmbuf_mtod_offset(m,
 413                                         struct rte_ipv4_hdr *, m->l2_len);
 414                 th = RTE_PTR_ADD(iph, m->l3_len);
 415                 if ((iph->version_ihl >> 4) == 4) {
 416                         iph->hdr_checksum = 0;
 417                         iph->hdr_checksum = rte_ipv4_cksum(iph);
 418                         ip_len = iph->total_length;
 419                         ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
 420                                 m->l3_len);
 421                 } else {
 422                         ip6h = (struct rte_ipv6_hdr *)iph;
 423                         ip_paylen = ip6h->payload_len;
 424                 }
 425
 426                 /* calculate the new phdr checksum not including ip_paylen */
 427                 prev_cksum = th->cksum;
 428                 tmp = prev_cksum;
 429                 tmp += ip_paylen;
 430                 tmp = (tmp & 0xffff) + (tmp >> 16);
 431                 new_cksum = tmp;
 432
 433                 /* replace it in the packet */
 434                 th->cksum = new_cksum;
 435         }
 436 }
 437
 438
 439
 440
 441 static inline void
 442 virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
 443                         struct rte_mbuf **cookies,
 444                         uint16_t num)
 445 {
 446         struct vq_desc_extra *dxp;
 447         struct virtqueue *vq = virtnet_txq_to_vq(txvq);
 448         struct vring_desc *start_dp;
 449         struct virtio_net_hdr *hdr;
 450         uint16_t idx;
 451         int16_t head_size = vq->hw->vtnet_hdr_size;
 452         uint16_t i = 0;
 453
 454         idx = vq->vq_desc_head_idx;
 455         start_dp = vq->vq_split.ring.desc;
 456
 457         while (i < num) {
 458                 idx = idx & (vq->vq_nentries - 1);
 459                 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
 460                 dxp->cookie = (void *)cookies[i];
 461                 dxp->ndescs = 1;
 462                 virtio_update_packet_stats(&txvq->stats, cookies[i]);
 463
 464                 hdr = rte_pktmbuf_mtod_offset(cookies[i],
 465                                 struct virtio_net_hdr *, -head_size);
 466
 467                 /* if offload disabled, hdr is not zeroed yet, do it now */
 468                 if (!vq->hw->has_tx_offload)
 469                         virtqueue_clear_net_hdr(hdr);
 470                 else
 471                         virtqueue_xmit_offload(hdr, cookies[i]);
 472
 473                 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq) - head_size;
 474                 start_dp[idx].len = cookies[i]->data_len + head_size;
 475                 start_dp[idx].flags = 0;
 476
 477
 478                 vq_update_avail_ring(vq, idx);
 479
 480                 idx++;
 481                 i++;
 482         };
 483
 484         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 485         vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
 486 }
 487
 488 static inline void
 489 virtqueue_enqueue_xmit_packed_fast(struct virtnet_tx *txvq,
 490                                    struct rte_mbuf *cookie,
 491                                    int in_order)
 492 {
 493         struct virtqueue *vq = virtnet_txq_to_vq(txvq);
 494         struct vring_packed_desc *dp;
 495         struct vq_desc_extra *dxp;
 496         uint16_t idx, id, flags;
 497         int16_t head_size = vq->hw->vtnet_hdr_size;
 498         struct virtio_net_hdr *hdr;
 499
 500         id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
 501         idx = vq->vq_avail_idx;
 502         dp = &vq->vq_packed.ring.desc[idx];
 503
 504         dxp = &vq->vq_descx[id];
 505         dxp->ndescs = 1;
 506         dxp->cookie = cookie;
 507
 508         flags = vq->vq_packed.cached_flags;
 509
 510         /* prepend cannot fail, checked by caller */
 511         hdr = rte_pktmbuf_mtod_offset(cookie, struct virtio_net_hdr *,
 512                                       -head_size);
 513
 514         /* if offload disabled, hdr is not zeroed yet, do it now */
 515         if (!vq->hw->has_tx_offload)
 516                 virtqueue_clear_net_hdr(hdr);
 517         else
 518                 virtqueue_xmit_offload(hdr, cookie);
 519
 520         dp->addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq) - head_size;
 521         dp->len = cookie->data_len + head_size;
 522         dp->id = id;
 523
 524         if (++vq->vq_avail_idx >= vq->vq_nentries) {
 525                 vq->vq_avail_idx -= vq->vq_nentries;
 526                 vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED;
 527         }
 528
 529         vq->vq_free_cnt--;
 530
 531         if (!in_order) {
 532                 vq->vq_desc_head_idx = dxp->next;
 533                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 534                         vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
 535         }
 536
 537         virtqueue_store_flags_packed(dp, flags, vq->hw->weak_barriers);
 538 }
 539
 540 static inline void
 541 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 542                         uint16_t needed, int use_indirect, int can_push,
 543                         int in_order)
 544 {
 545         struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 546         struct vq_desc_extra *dxp;
 547         struct virtqueue *vq = virtnet_txq_to_vq(txvq);
 548         struct vring_desc *start_dp;
 549         uint16_t seg_num = cookie->nb_segs;
 550         uint16_t head_idx, idx;
 551         int16_t head_size = vq->hw->vtnet_hdr_size;
 552         bool prepend_header = false;
 553         struct virtio_net_hdr *hdr;
 554
 555         head_idx = vq->vq_desc_head_idx;
 556         idx = head_idx;
 557         if (in_order)
 558                 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
 559         else
 560                 dxp = &vq->vq_descx[idx];
 561         dxp->cookie = (void *)cookie;
 562         dxp->ndescs = needed;
 563
 564         start_dp = vq->vq_split.ring.desc;
 565
 566         if (can_push) {
 567                 /* prepend cannot fail, checked by caller */
 568                 hdr = rte_pktmbuf_mtod_offset(cookie, struct virtio_net_hdr *,
 569                                               -head_size);
 570                 prepend_header = true;
 571
 572                 /* if offload disabled, it is not zeroed below, do it now */
 573                 if (!vq->hw->has_tx_offload)
 574                         virtqueue_clear_net_hdr(hdr);
 575         } else if (use_indirect) {
 576                 /* setup tx ring slot to point to indirect
 577                  * descriptor list stored in reserved region.
 578                  *
 579                  * the first slot in indirect ring is already preset
 580                  * to point to the header in reserved region
 581                  */
 582                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 583                         RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
 584                 start_dp[idx].len   = (seg_num + 1) * sizeof(struct vring_desc);
 585                 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
 586                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 587
 588                 /* loop below will fill in rest of the indirect elements */
 589                 start_dp = txr[idx].tx_indir;
 590                 idx = 1;
 591         } else {
 592                 /* setup first tx ring slot to point to header
 593                  * stored in reserved region.
 594                  */
 595                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 596                         RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
 597                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
 598                 start_dp[idx].flags = VRING_DESC_F_NEXT;
 599                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 600
 601                 idx = start_dp[idx].next;
 602         }
 603
 604         if (vq->hw->has_tx_offload)
 605                 virtqueue_xmit_offload(hdr, cookie);
 606
 607         do {
 608                 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 609                 start_dp[idx].len = cookie->data_len;
 610                 if (prepend_header) {
 611                         start_dp[idx].addr -= head_size;
 612                         start_dp[idx].len += head_size;
 613                         prepend_header = false;
 614                 }
 615                 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 616                 idx = start_dp[idx].next;
 617         } while ((cookie = cookie->next) != NULL);
 618
 619         if (use_indirect)
 620                 idx = vq->vq_split.ring.desc[head_idx].next;
 621
 622         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 623
 624         vq->vq_desc_head_idx = idx;
 625         vq_update_avail_ring(vq, head_idx);
 626
 627         if (!in_order) {
 628                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 629                         vq->vq_desc_tail_idx = idx;
 630         }
 631 }
 632
 633 void
 634 virtio_dev_cq_start(struct rte_eth_dev *dev)
 635 {
 636         struct virtio_hw *hw = dev->data->dev_private;
 637
 638         if (hw->cvq) {
 639                 rte_spinlock_init(&hw->cvq->lock);
 640                 VIRTQUEUE_DUMP(virtnet_cq_to_vq(hw->cvq));
 641         }
 642 }
 643
 644 int
 645 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
 646                         uint16_t queue_idx,
 647                         uint16_t nb_desc,
 648                         unsigned int socket_id __rte_unused,
 649                         const struct rte_eth_rxconf *rx_conf,
 650                         struct rte_mempool *mp)
 651 {
 652         uint16_t vq_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 653         struct virtio_hw *hw = dev->data->dev_private;
 654         struct virtqueue *vq = hw->vqs[vq_idx];
 655         struct virtnet_rx *rxvq;
 656         uint16_t rx_free_thresh;
 657         uint16_t buf_size;
 658         const char *error;
 659
 660         PMD_INIT_FUNC_TRACE();
 661
 662         if (rx_conf->rx_deferred_start) {
 663                 PMD_INIT_LOG(ERR, "Rx deferred start is not supported");
 664                 return -EINVAL;
 665         }
 666
 667         buf_size = virtio_rx_mem_pool_buf_size(mp);
 668         if (!virtio_rx_check_scatter(hw->max_rx_pkt_len, buf_size,
 669                                      hw->rx_ol_scatter, &error)) {
 670                 PMD_INIT_LOG(ERR, "RxQ %u Rx scatter check failed: %s",
 671                              queue_idx, error);
 672                 return -EINVAL;
 673         }
 674
 675         rx_free_thresh = rx_conf->rx_free_thresh;
 676         if (rx_free_thresh == 0)
 677                 rx_free_thresh =
 678                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_RX_FREE_THRESH);
 679
 680         if (rx_free_thresh & 0x3) {
 681                 PMD_INIT_LOG(ERR, "rx_free_thresh must be multiples of four."
 682                         " (rx_free_thresh=%u port=%u queue=%u)",
 683                         rx_free_thresh, dev->data->port_id, queue_idx);
 684                 return -EINVAL;
 685         }
 686
 687         if (rx_free_thresh >= vq->vq_nentries) {
 688                 PMD_INIT_LOG(ERR, "rx_free_thresh must be less than the "
 689                         "number of RX entries (%u)."
 690                         " (rx_free_thresh=%u port=%u queue=%u)",
 691                         vq->vq_nentries,
 692                         rx_free_thresh, dev->data->port_id, queue_idx);
 693                 return -EINVAL;
 694         }
 695         vq->vq_free_thresh = rx_free_thresh;
 696
 697         /*
 698          * For split ring vectorized path descriptors number must be
 699          * equal to the ring size.
 700          */
 701         if (nb_desc > vq->vq_nentries ||
 702             (!virtio_with_packed_queue(hw) && hw->use_vec_rx)) {
 703                 nb_desc = vq->vq_nentries;
 704         }
 705         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 706
 707         rxvq = &vq->rxq;
 708         rxvq->queue_id = queue_idx;
 709         rxvq->mpool = mp;
 710         dev->data->rx_queues[queue_idx] = rxvq;
 711
 712         return 0;
 713 }
 714
 715 int
 716 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
 717 {
 718         uint16_t vq_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 719         struct virtio_hw *hw = dev->data->dev_private;
 720         struct virtqueue *vq = hw->vqs[vq_idx];
 721         struct virtnet_rx *rxvq = &vq->rxq;
 722         struct rte_mbuf *m;
 723         uint16_t desc_idx;
 724         int error, nbufs, i;
 725         bool in_order = virtio_with_feature(hw, VIRTIO_F_IN_ORDER);
 726
 727         PMD_INIT_FUNC_TRACE();
 728
 729         /* Allocate blank mbufs for the each rx descriptor */
 730         nbufs = 0;
 731
 732         if (hw->use_vec_rx && !virtio_with_packed_queue(hw)) {
 733                 for (desc_idx = 0; desc_idx < vq->vq_nentries;
 734                      desc_idx++) {
 735                         vq->vq_split.ring.avail->ring[desc_idx] = desc_idx;
 736                         vq->vq_split.ring.desc[desc_idx].flags =
 737                                 VRING_DESC_F_WRITE;
 738                 }
 739
 740                 virtio_rxq_vec_setup(rxvq);
 741         }
 742
 743         memset(rxvq->fake_mbuf, 0, sizeof(*rxvq->fake_mbuf));
 744         for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST; desc_idx++)
 745                 vq->sw_ring[vq->vq_nentries + desc_idx] = rxvq->fake_mbuf;
 746
 747         if (hw->use_vec_rx && !virtio_with_packed_queue(hw)) {
 748                 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
 749                         virtio_rxq_rearm_vec(rxvq);
 750                         nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
 751                 }
 752         } else if (!virtio_with_packed_queue(vq->hw) && in_order) {
 753                 if ((!virtqueue_full(vq))) {
 754                         uint16_t free_cnt = vq->vq_free_cnt;
 755                         struct rte_mbuf *pkts[free_cnt];
 756
 757                         if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
 758                                 free_cnt)) {
 759                                 error = virtqueue_enqueue_refill_inorder(vq,
 760                                                 pkts,
 761                                                 free_cnt);
 762                                 if (unlikely(error)) {
 763                                         for (i = 0; i < free_cnt; i++)
 764                                                 rte_pktmbuf_free(pkts[i]);
 765                                 } else {
 766                                         nbufs += free_cnt;
 767                                 }
 768                         }
 769
 770                         vq_update_avail_idx(vq);
 771                 }
 772         } else {
 773                 while (!virtqueue_full(vq)) {
 774                         m = rte_mbuf_raw_alloc(rxvq->mpool);
 775                         if (m == NULL)
 776                                 break;
 777
 778                         /* Enqueue allocated buffers */
 779                         if (virtio_with_packed_queue(vq->hw))
 780                                 error = virtqueue_enqueue_recv_refill_packed_init(vq,
 781                                                 &m, 1);
 782                         else
 783                                 error = virtqueue_enqueue_recv_refill(vq,
 784                                                 &m, 1);
 785                         if (error) {
 786                                 rte_pktmbuf_free(m);
 787                                 break;
 788                         }
 789                         nbufs++;
 790                 }
 791
 792                 if (!virtio_with_packed_queue(vq->hw))
 793                         vq_update_avail_idx(vq);
 794         }
 795
 796         PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
 797
 798         VIRTQUEUE_DUMP(vq);
 799
 800         return 0;
 801 }
 802
 803 /*
 804  * struct rte_eth_dev *dev: Used to update dev
 805  * uint16_t nb_desc: Defaults to values read from config space
 806  * unsigned int socket_id: Used to allocate memzone
 807  * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
 808  * uint16_t queue_idx: Just used as an index in dev txq list
 809  */
 810 int
 811 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 812                         uint16_t queue_idx,
 813                         uint16_t nb_desc,
 814                         unsigned int socket_id __rte_unused,
 815                         const struct rte_eth_txconf *tx_conf)
 816 {
 817         uint8_t vq_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 818         struct virtio_hw *hw = dev->data->dev_private;
 819         struct virtqueue *vq = hw->vqs[vq_idx];
 820         struct virtnet_tx *txvq;
 821         uint16_t tx_free_thresh;
 822
 823         PMD_INIT_FUNC_TRACE();
 824
 825         if (tx_conf->tx_deferred_start) {
 826                 PMD_INIT_LOG(ERR, "Tx deferred start is not supported");
 827                 return -EINVAL;
 828         }
 829
 830         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
 831                 nb_desc = vq->vq_nentries;
 832         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 833
 834         txvq = &vq->txq;
 835         txvq->queue_id = queue_idx;
 836
 837         tx_free_thresh = tx_conf->tx_free_thresh;
 838         if (tx_free_thresh == 0)
 839                 tx_free_thresh =
 840                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
 841
 842         if (tx_free_thresh >= (vq->vq_nentries - 3)) {
 843                 PMD_DRV_LOG(ERR, "tx_free_thresh must be less than the "
 844                         "number of TX entries minus 3 (%u)."
 845                         " (tx_free_thresh=%u port=%u queue=%u)",
 846                         vq->vq_nentries - 3,
 847                         tx_free_thresh, dev->data->port_id, queue_idx);
 848                 return -EINVAL;
 849         }
 850
 851         vq->vq_free_thresh = tx_free_thresh;
 852
 853         dev->data->tx_queues[queue_idx] = txvq;
 854         return 0;
 855 }
 856
 857 int
 858 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
 859                                 uint16_t queue_idx)
 860 {
 861         uint8_t vq_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 862         struct virtio_hw *hw = dev->data->dev_private;
 863         struct virtqueue *vq = hw->vqs[vq_idx];
 864
 865         PMD_INIT_FUNC_TRACE();
 866
 867         if (!virtio_with_packed_queue(hw)) {
 868                 if (virtio_with_feature(hw, VIRTIO_F_IN_ORDER))
 869                         vq->vq_split.ring.desc[vq->vq_nentries - 1].next = 0;
 870         }
 871
 872         VIRTQUEUE_DUMP(vq);
 873
 874         return 0;
 875 }
 876
 877 static inline void
 878 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
 879 {
 880         int error;
 881         /*
 882          * Requeue the discarded mbuf. This should always be
 883          * successful since it was just dequeued.
 884          */
 885         if (virtio_with_packed_queue(vq->hw))
 886                 error = virtqueue_enqueue_recv_refill_packed(vq, &m, 1);
 887         else
 888                 error = virtqueue_enqueue_recv_refill(vq, &m, 1);
 889
 890         if (unlikely(error)) {
 891                 PMD_DRV_LOG(ERR, "cannot requeue discarded mbuf");
 892                 rte_pktmbuf_free(m);
 893         }
 894 }
 895
 896 static inline void
 897 virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
 898 {
 899         int error;
 900
 901         error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
 902         if (unlikely(error)) {
 903                 PMD_DRV_LOG(ERR, "cannot requeue discarded mbuf");
 904                 rte_pktmbuf_free(m);
 905         }
 906 }
 907
 908 /* Optionally fill offload information in structure */
 909 static inline int
 910 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
 911 {
 912         struct rte_net_hdr_lens hdr_lens;
 913         uint32_t hdrlen, ptype;
 914         int l4_supported = 0;
 915
 916         /* nothing to do */
 917         if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
 918                 return 0;
 919
 920         m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
 921
 922         ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
 923         m->packet_type = ptype;
 924         if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
 925             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
 926             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
 927                 l4_supported = 1;
 928
 929         if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
 930                 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
 931                 if (hdr->csum_start <= hdrlen && l4_supported) {
 932                         m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
 933                 } else {
 934                         /* Unknown proto or tunnel, do sw cksum. We can assume
 935                          * the cksum field is in the first segment since the
 936                          * buffers we provided to the host are large enough.
 937                          * In case of SCTP, this will be wrong since it's a CRC
 938                          * but there's nothing we can do.
 939                          */
 940                         uint16_t csum = 0, off;
 941
 942                         if (rte_raw_cksum_mbuf(m, hdr->csum_start,
 943                                 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
 944                                 &csum) < 0)
 945                                 return -EINVAL;
 946                         if (likely(csum != 0xffff))
 947                                 csum = ~csum;
 948                         off = hdr->csum_offset + hdr->csum_start;
 949                         if (rte_pktmbuf_data_len(m) >= off + 1)
 950                                 *rte_pktmbuf_mtod_offset(m, uint16_t *,
 951                                         off) = csum;
 952                 }
 953         } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
 954                 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
 955         }
 956
 957         /* GSO request, save required information in mbuf */
 958         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
 959                 /* Check unsupported modes */
 960                 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
 961                     (hdr->gso_size == 0)) {
 962                         return -EINVAL;
 963                 }
 964
 965                 /* Update mss lengthes in mbuf */
 966                 m->tso_segsz = hdr->gso_size;
 967                 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
 968                         case VIRTIO_NET_HDR_GSO_TCPV4:
 969                         case VIRTIO_NET_HDR_GSO_TCPV6:
 970                                 m->ol_flags |= PKT_RX_LRO | \
 971                                         PKT_RX_L4_CKSUM_NONE;
 972                                 break;
 973                         default:
 974                                 return -EINVAL;
 975                 }
 976         }
 977
 978         return 0;
 979 }
 980
 981 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
 982 uint16_t
 983 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 984 {
 985         struct virtnet_rx *rxvq = rx_queue;
 986         struct virtqueue *vq = virtnet_rxq_to_vq(rxvq);
 987         struct virtio_hw *hw = vq->hw;
 988         struct rte_mbuf *rxm;
 989         uint16_t nb_used, num, nb_rx;
 990         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 991         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 992         int error;
 993         uint32_t i, nb_enqueued;
 994         uint32_t hdr_size;
 995         struct virtio_net_hdr *hdr;
 996
 997         nb_rx = 0;
 998         if (unlikely(hw->started == 0))
 999                 return nb_rx;
1000
1001         nb_used = virtqueue_nused(vq);
1002
1003         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1004         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1005                 num = VIRTIO_MBUF_BURST_SZ;
1006         if (likely(num > DESC_PER_CACHELINE))
1007                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1008
1009         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1010         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
1011
1012         nb_enqueued = 0;
1013         hdr_size = hw->vtnet_hdr_size;
1014
1015         for (i = 0; i < num ; i++) {
1016                 rxm = rcv_pkts[i];
1017
1018                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1019
1020                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1021                         PMD_RX_LOG(ERR, "Packet drop");
1022                         nb_enqueued++;
1023                         virtio_discard_rxbuf(vq, rxm);
1024                         rxvq->stats.errors++;
1025                         continue;
1026                 }
1027
1028                 rxm->port = rxvq->port_id;
1029                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1030                 rxm->ol_flags = 0;
1031                 rxm->vlan_tci = 0;
1032
1033                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1034                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1035
1036                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1037                         RTE_PKTMBUF_HEADROOM - hdr_size);
1038
1039                 if (hw->vlan_strip)
1040                         rte_vlan_strip(rxm);
1041
1042                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1043                         virtio_discard_rxbuf(vq, rxm);
1044                         rxvq->stats.errors++;
1045                         continue;
1046                 }
1047
1048                 virtio_rx_stats_updated(rxvq, rxm);
1049
1050                 rx_pkts[nb_rx++] = rxm;
1051         }
1052
1053         rxvq->stats.packets += nb_rx;
1054
1055         /* Allocate new mbuf for the used descriptor */
1056         if (likely(!virtqueue_full(vq))) {
1057                 uint16_t free_cnt = vq->vq_free_cnt;
1058                 struct rte_mbuf *new_pkts[free_cnt];
1059
1060                 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1061                                                 free_cnt) == 0)) {
1062                         error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1063                                         free_cnt);
1064                         if (unlikely(error)) {
1065                                 for (i = 0; i < free_cnt; i++)
1066                                         rte_pktmbuf_free(new_pkts[i]);
1067                         }
1068                         nb_enqueued += free_cnt;
1069                 } else {
1070                         struct rte_eth_dev *dev =
1071                                 &rte_eth_devices[rxvq->port_id];
1072                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1073                 }
1074         }
1075
1076         if (likely(nb_enqueued)) {
1077                 vq_update_avail_idx(vq);
1078
1079                 if (unlikely(virtqueue_kick_prepare(vq))) {
1080                         virtqueue_notify(vq);
1081                         PMD_RX_LOG(DEBUG, "Notified");
1082                 }
1083         }
1084
1085         return nb_rx;
1086 }
1087
1088 uint16_t
1089 virtio_recv_pkts_packed(void *rx_queue, struct rte_mbuf **rx_pkts,
1090                         uint16_t nb_pkts)
1091 {
1092         struct virtnet_rx *rxvq = rx_queue;
1093         struct virtqueue *vq = virtnet_rxq_to_vq(rxvq);
1094         struct virtio_hw *hw = vq->hw;
1095         struct rte_mbuf *rxm;
1096         uint16_t num, nb_rx;
1097         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1098         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1099         int error;
1100         uint32_t i, nb_enqueued;
1101         uint32_t hdr_size;
1102         struct virtio_net_hdr *hdr;
1103
1104         nb_rx = 0;
1105         if (unlikely(hw->started == 0))
1106                 return nb_rx;
1107
1108         num = RTE_MIN(VIRTIO_MBUF_BURST_SZ, nb_pkts);
1109         if (likely(num > DESC_PER_CACHELINE))
1110                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1111
1112         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1113         PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1114
1115         nb_enqueued = 0;
1116         hdr_size = hw->vtnet_hdr_size;
1117
1118         for (i = 0; i < num; i++) {
1119                 rxm = rcv_pkts[i];
1120
1121                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1122
1123                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1124                         PMD_RX_LOG(ERR, "Packet drop");
1125                         nb_enqueued++;
1126                         virtio_discard_rxbuf(vq, rxm);
1127                         rxvq->stats.errors++;
1128                         continue;
1129                 }
1130
1131                 rxm->port = rxvq->port_id;
1132                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1133                 rxm->ol_flags = 0;
1134                 rxm->vlan_tci = 0;
1135
1136                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1137                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1138
1139                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1140                         RTE_PKTMBUF_HEADROOM - hdr_size);
1141
1142                 if (hw->vlan_strip)
1143                         rte_vlan_strip(rxm);
1144
1145                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1146                         virtio_discard_rxbuf(vq, rxm);
1147                         rxvq->stats.errors++;
1148                         continue;
1149                 }
1150
1151                 virtio_rx_stats_updated(rxvq, rxm);
1152
1153                 rx_pkts[nb_rx++] = rxm;
1154         }
1155
1156         rxvq->stats.packets += nb_rx;
1157
1158         /* Allocate new mbuf for the used descriptor */
1159         if (likely(!virtqueue_full(vq))) {
1160                 uint16_t free_cnt = vq->vq_free_cnt;
1161                 struct rte_mbuf *new_pkts[free_cnt];
1162
1163                 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1164                                                 free_cnt) == 0)) {
1165                         error = virtqueue_enqueue_recv_refill_packed(vq,
1166                                         new_pkts, free_cnt);
1167                         if (unlikely(error)) {
1168                                 for (i = 0; i < free_cnt; i++)
1169                                         rte_pktmbuf_free(new_pkts[i]);
1170                         }
1171                         nb_enqueued += free_cnt;
1172                 } else {
1173                         struct rte_eth_dev *dev =
1174                                 &rte_eth_devices[rxvq->port_id];
1175                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1176                 }
1177         }
1178
1179         if (likely(nb_enqueued)) {
1180                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1181                         virtqueue_notify(vq);
1182                         PMD_RX_LOG(DEBUG, "Notified");
1183                 }
1184         }
1185
1186         return nb_rx;
1187 }
1188
1189
1190 uint16_t
1191 virtio_recv_pkts_inorder(void *rx_queue,
1192                         struct rte_mbuf **rx_pkts,
1193                         uint16_t nb_pkts)
1194 {
1195         struct virtnet_rx *rxvq = rx_queue;
1196         struct virtqueue *vq = virtnet_rxq_to_vq(rxvq);
1197         struct virtio_hw *hw = vq->hw;
1198         struct rte_mbuf *rxm;
1199         struct rte_mbuf *prev = NULL;
1200         uint16_t nb_used, num, nb_rx;
1201         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1202         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1203         int error;
1204         uint32_t nb_enqueued;
1205         uint32_t seg_num;
1206         uint32_t seg_res;
1207         uint32_t hdr_size;
1208         int32_t i;
1209
1210         nb_rx = 0;
1211         if (unlikely(hw->started == 0))
1212                 return nb_rx;
1213
1214         nb_used = virtqueue_nused(vq);
1215         nb_used = RTE_MIN(nb_used, nb_pkts);
1216         nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ);
1217
1218         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1219
1220         nb_enqueued = 0;
1221         seg_num = 1;
1222         seg_res = 0;
1223         hdr_size = hw->vtnet_hdr_size;
1224
1225         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
1226
1227         for (i = 0; i < num; i++) {
1228                 struct virtio_net_hdr_mrg_rxbuf *header;
1229
1230                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1231                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1232
1233                 rxm = rcv_pkts[i];
1234
1235                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1236                         PMD_RX_LOG(ERR, "Packet drop");
1237                         nb_enqueued++;
1238                         virtio_discard_rxbuf_inorder(vq, rxm);
1239                         rxvq->stats.errors++;
1240                         continue;
1241                 }
1242
1243                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1244                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1245                          - hdr_size);
1246
1247                 if (virtio_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
1248                         seg_num = header->num_buffers;
1249                         if (seg_num == 0)
1250                                 seg_num = 1;
1251                 } else {
1252                         seg_num = 1;
1253                 }
1254
1255                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1256                 rxm->nb_segs = seg_num;
1257                 rxm->ol_flags = 0;
1258                 rxm->vlan_tci = 0;
1259                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1260                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1261
1262                 rxm->port = rxvq->port_id;
1263
1264                 rx_pkts[nb_rx] = rxm;
1265                 prev = rxm;
1266
1267                 if (vq->hw->has_rx_offload &&
1268                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1269                         virtio_discard_rxbuf_inorder(vq, rxm);
1270                         rxvq->stats.errors++;
1271                         continue;
1272                 }
1273
1274                 if (hw->vlan_strip)
1275                         rte_vlan_strip(rx_pkts[nb_rx]);
1276
1277                 seg_res = seg_num - 1;
1278
1279                 /* Merge remaining segments */
1280                 while (seg_res != 0 && i < (num - 1)) {
1281                         i++;
1282
1283                         rxm = rcv_pkts[i];
1284                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1285                         rxm->pkt_len = (uint32_t)(len[i]);
1286                         rxm->data_len = (uint16_t)(len[i]);
1287
1288                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1289
1290                         prev->next = rxm;
1291                         prev = rxm;
1292                         seg_res -= 1;
1293                 }
1294
1295                 if (!seg_res) {
1296                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1297                         nb_rx++;
1298                 }
1299         }
1300
1301         /* Last packet still need merge segments */
1302         while (seg_res != 0) {
1303                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1304                                         VIRTIO_MBUF_BURST_SZ);
1305
1306                 if (likely(virtqueue_nused(vq) >= rcv_cnt)) {
1307                         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
1308                                                            rcv_cnt);
1309                         uint16_t extra_idx = 0;
1310
1311                         rcv_cnt = num;
1312                         while (extra_idx < rcv_cnt) {
1313                                 rxm = rcv_pkts[extra_idx];
1314                                 rxm->data_off =
1315                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1316                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1317                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1318                                 prev->next = rxm;
1319                                 prev = rxm;
1320                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1321                                 extra_idx += 1;
1322                         };
1323                         seg_res -= rcv_cnt;
1324
1325                         if (!seg_res) {
1326                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1327                                 nb_rx++;
1328                         }
1329                 } else {
1330                         PMD_RX_LOG(ERR,
1331                                         "No enough segments for packet.");
1332                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1333                         rxvq->stats.errors++;
1334                         break;
1335                 }
1336         }
1337
1338         rxvq->stats.packets += nb_rx;
1339
1340         /* Allocate new mbuf for the used descriptor */
1341
1342         if (likely(!virtqueue_full(vq))) {
1343                 /* free_cnt may include mrg descs */
1344                 uint16_t free_cnt = vq->vq_free_cnt;
1345                 struct rte_mbuf *new_pkts[free_cnt];
1346
1347                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1348                         error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
1349                                         free_cnt);
1350                         if (unlikely(error)) {
1351                                 for (i = 0; i < free_cnt; i++)
1352                                         rte_pktmbuf_free(new_pkts[i]);
1353                         }
1354                         nb_enqueued += free_cnt;
1355                 } else {
1356                         struct rte_eth_dev *dev =
1357                                 &rte_eth_devices[rxvq->port_id];
1358                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1359                 }
1360         }
1361
1362         if (likely(nb_enqueued)) {
1363                 vq_update_avail_idx(vq);
1364
1365                 if (unlikely(virtqueue_kick_prepare(vq))) {
1366                         virtqueue_notify(vq);
1367                         PMD_RX_LOG(DEBUG, "Notified");
1368                 }
1369         }
1370
1371         return nb_rx;
1372 }
1373
1374 uint16_t
1375 virtio_recv_mergeable_pkts(void *rx_queue,
1376                         struct rte_mbuf **rx_pkts,
1377                         uint16_t nb_pkts)
1378 {
1379         struct virtnet_rx *rxvq = rx_queue;
1380         struct virtqueue *vq = virtnet_rxq_to_vq(rxvq);
1381         struct virtio_hw *hw = vq->hw;
1382         struct rte_mbuf *rxm;
1383         struct rte_mbuf *prev = NULL;
1384         uint16_t nb_used, num, nb_rx = 0;
1385         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1386         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1387         int error;
1388         uint32_t nb_enqueued = 0;
1389         uint32_t seg_num = 0;
1390         uint32_t seg_res = 0;
1391         uint32_t hdr_size = hw->vtnet_hdr_size;
1392         int32_t i;
1393
1394         if (unlikely(hw->started == 0))
1395                 return nb_rx;
1396
1397         nb_used = virtqueue_nused(vq);
1398
1399         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1400
1401         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1402         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1403                 num = VIRTIO_MBUF_BURST_SZ;
1404         if (likely(num > DESC_PER_CACHELINE))
1405                 num = num - ((vq->vq_used_cons_idx + num) %
1406                                 DESC_PER_CACHELINE);
1407
1408
1409         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1410
1411         for (i = 0; i < num; i++) {
1412                 struct virtio_net_hdr_mrg_rxbuf *header;
1413
1414                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1415                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1416
1417                 rxm = rcv_pkts[i];
1418
1419                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1420                         PMD_RX_LOG(ERR, "Packet drop");
1421                         nb_enqueued++;
1422                         virtio_discard_rxbuf(vq, rxm);
1423                         rxvq->stats.errors++;
1424                         continue;
1425                 }
1426
1427                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1428                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1429                          - hdr_size);
1430                 seg_num = header->num_buffers;
1431                 if (seg_num == 0)
1432                         seg_num = 1;
1433
1434                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1435                 rxm->nb_segs = seg_num;
1436                 rxm->ol_flags = 0;
1437                 rxm->vlan_tci = 0;
1438                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1439                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1440
1441                 rxm->port = rxvq->port_id;
1442
1443                 rx_pkts[nb_rx] = rxm;
1444                 prev = rxm;
1445
1446                 if (hw->has_rx_offload &&
1447                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1448                         virtio_discard_rxbuf(vq, rxm);
1449                         rxvq->stats.errors++;
1450                         continue;
1451                 }
1452
1453                 if (hw->vlan_strip)
1454                         rte_vlan_strip(rx_pkts[nb_rx]);
1455
1456                 seg_res = seg_num - 1;
1457
1458                 /* Merge remaining segments */
1459                 while (seg_res != 0 && i < (num - 1)) {
1460                         i++;
1461
1462                         rxm = rcv_pkts[i];
1463                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1464                         rxm->pkt_len = (uint32_t)(len[i]);
1465                         rxm->data_len = (uint16_t)(len[i]);
1466
1467                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1468
1469                         prev->next = rxm;
1470                         prev = rxm;
1471                         seg_res -= 1;
1472                 }
1473
1474                 if (!seg_res) {
1475                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1476                         nb_rx++;
1477                 }
1478         }
1479
1480         /* Last packet still need merge segments */
1481         while (seg_res != 0) {
1482                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1483                                         VIRTIO_MBUF_BURST_SZ);
1484
1485                 if (likely(virtqueue_nused(vq) >= rcv_cnt)) {
1486                         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len,
1487                                                            rcv_cnt);
1488                         uint16_t extra_idx = 0;
1489
1490                         rcv_cnt = num;
1491                         while (extra_idx < rcv_cnt) {
1492                                 rxm = rcv_pkts[extra_idx];
1493                                 rxm->data_off =
1494                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1495                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1496                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1497                                 prev->next = rxm;
1498                                 prev = rxm;
1499                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1500                                 extra_idx += 1;
1501                         };
1502                         seg_res -= rcv_cnt;
1503
1504                         if (!seg_res) {
1505                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1506                                 nb_rx++;
1507                         }
1508                 } else {
1509                         PMD_RX_LOG(ERR,
1510                                         "No enough segments for packet.");
1511                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1512                         rxvq->stats.errors++;
1513                         break;
1514                 }
1515         }
1516
1517         rxvq->stats.packets += nb_rx;
1518
1519         /* Allocate new mbuf for the used descriptor */
1520         if (likely(!virtqueue_full(vq))) {
1521                 /* free_cnt may include mrg descs */
1522                 uint16_t free_cnt = vq->vq_free_cnt;
1523                 struct rte_mbuf *new_pkts[free_cnt];
1524
1525                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1526                         error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1527                                         free_cnt);
1528                         if (unlikely(error)) {
1529                                 for (i = 0; i < free_cnt; i++)
1530                                         rte_pktmbuf_free(new_pkts[i]);
1531                         }
1532                         nb_enqueued += free_cnt;
1533                 } else {
1534                         struct rte_eth_dev *dev =
1535                                 &rte_eth_devices[rxvq->port_id];
1536                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1537                 }
1538         }
1539
1540         if (likely(nb_enqueued)) {
1541                 vq_update_avail_idx(vq);
1542
1543                 if (unlikely(virtqueue_kick_prepare(vq))) {
1544                         virtqueue_notify(vq);
1545                         PMD_RX_LOG(DEBUG, "Notified");
1546                 }
1547         }
1548
1549         return nb_rx;
1550 }
1551
1552 uint16_t
1553 virtio_recv_mergeable_pkts_packed(void *rx_queue,
1554                         struct rte_mbuf **rx_pkts,
1555                         uint16_t nb_pkts)
1556 {
1557         struct virtnet_rx *rxvq = rx_queue;
1558         struct virtqueue *vq = virtnet_rxq_to_vq(rxvq);
1559         struct virtio_hw *hw = vq->hw;
1560         struct rte_mbuf *rxm;
1561         struct rte_mbuf *prev = NULL;
1562         uint16_t num, nb_rx = 0;
1563         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1564         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1565         uint32_t nb_enqueued = 0;
1566         uint32_t seg_num = 0;
1567         uint32_t seg_res = 0;
1568         uint32_t hdr_size = hw->vtnet_hdr_size;
1569         int32_t i;
1570         int error;
1571
1572         if (unlikely(hw->started == 0))
1573                 return nb_rx;
1574
1575
1576         num = nb_pkts;
1577         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1578                 num = VIRTIO_MBUF_BURST_SZ;
1579         if (likely(num > DESC_PER_CACHELINE))
1580                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1581
1582         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1583
1584         for (i = 0; i < num; i++) {
1585                 struct virtio_net_hdr_mrg_rxbuf *header;
1586
1587                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1588                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1589
1590                 rxm = rcv_pkts[i];
1591
1592                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1593                         PMD_RX_LOG(ERR, "Packet drop");
1594                         nb_enqueued++;
1595                         virtio_discard_rxbuf(vq, rxm);
1596                         rxvq->stats.errors++;
1597                         continue;
1598                 }
1599
1600                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)
1601                           rxm->buf_addr + RTE_PKTMBUF_HEADROOM - hdr_size);
1602                 seg_num = header->num_buffers;
1603
1604                 if (seg_num == 0)
1605                         seg_num = 1;
1606
1607                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1608                 rxm->nb_segs = seg_num;
1609                 rxm->ol_flags = 0;
1610                 rxm->vlan_tci = 0;
1611                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1612                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1613
1614                 rxm->port = rxvq->port_id;
1615                 rx_pkts[nb_rx] = rxm;
1616                 prev = rxm;
1617
1618                 if (hw->has_rx_offload &&
1619                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1620                         virtio_discard_rxbuf(vq, rxm);
1621                         rxvq->stats.errors++;
1622                         continue;
1623                 }
1624
1625                 if (hw->vlan_strip)
1626                         rte_vlan_strip(rx_pkts[nb_rx]);
1627
1628                 seg_res = seg_num - 1;
1629
1630                 /* Merge remaining segments */
1631                 while (seg_res != 0 && i < (num - 1)) {
1632                         i++;
1633
1634                         rxm = rcv_pkts[i];
1635                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1636                         rxm->pkt_len = (uint32_t)(len[i]);
1637                         rxm->data_len = (uint16_t)(len[i]);
1638
1639                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1640
1641                         prev->next = rxm;
1642                         prev = rxm;
1643                         seg_res -= 1;
1644                 }
1645
1646                 if (!seg_res) {
1647                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1648                         nb_rx++;
1649                 }
1650         }
1651
1652         /* Last packet still need merge segments */
1653         while (seg_res != 0) {
1654                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1655                                         VIRTIO_MBUF_BURST_SZ);
1656                 uint16_t extra_idx = 0;
1657
1658                 rcv_cnt = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts,
1659                                 len, rcv_cnt);
1660                 if (unlikely(rcv_cnt == 0)) {
1661                         PMD_RX_LOG(ERR, "No enough segments for packet.");
1662                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1663                         rxvq->stats.errors++;
1664                         break;
1665                 }
1666
1667                 while (extra_idx < rcv_cnt) {
1668                         rxm = rcv_pkts[extra_idx];
1669
1670                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1671                         rxm->pkt_len = (uint32_t)(len[extra_idx]);
1672                         rxm->data_len = (uint16_t)(len[extra_idx]);
1673
1674                         prev->next = rxm;
1675                         prev = rxm;
1676                         rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1677                         extra_idx += 1;
1678                 }
1679                 seg_res -= rcv_cnt;
1680                 if (!seg_res) {
1681                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1682                         nb_rx++;
1683                 }
1684         }
1685
1686         rxvq->stats.packets += nb_rx;
1687
1688         /* Allocate new mbuf for the used descriptor */
1689         if (likely(!virtqueue_full(vq))) {
1690                 /* free_cnt may include mrg descs */
1691                 uint16_t free_cnt = vq->vq_free_cnt;
1692                 struct rte_mbuf *new_pkts[free_cnt];
1693
1694                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1695                         error = virtqueue_enqueue_recv_refill_packed(vq,
1696                                         new_pkts, free_cnt);
1697                         if (unlikely(error)) {
1698                                 for (i = 0; i < free_cnt; i++)
1699                                         rte_pktmbuf_free(new_pkts[i]);
1700                         }
1701                         nb_enqueued += free_cnt;
1702                 } else {
1703                         struct rte_eth_dev *dev =
1704                                 &rte_eth_devices[rxvq->port_id];
1705                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1706                 }
1707         }
1708
1709         if (likely(nb_enqueued)) {
1710                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1711                         virtqueue_notify(vq);
1712                         PMD_RX_LOG(DEBUG, "Notified");
1713                 }
1714         }
1715
1716         return nb_rx;
1717 }
1718
1719 uint16_t
1720 virtio_xmit_pkts_prepare(void *tx_queue __rte_unused, struct rte_mbuf **tx_pkts,
1721                         uint16_t nb_pkts)
1722 {
1723         uint16_t nb_tx;
1724         int error;
1725
1726         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1727                 struct rte_mbuf *m = tx_pkts[nb_tx];
1728
1729 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
1730                 error = rte_validate_tx_offload(m);
1731                 if (unlikely(error)) {
1732                         rte_errno = -error;
1733                         break;
1734                 }
1735 #endif
1736
1737                 /* Do VLAN tag insertion */
1738                 if (unlikely(m->ol_flags & PKT_TX_VLAN)) {
1739                         error = rte_vlan_insert(&m);
1740                         /* rte_vlan_insert() may change pointer
1741                          * even in the case of failure
1742                          */
1743                         tx_pkts[nb_tx] = m;
1744
1745                         if (unlikely(error)) {
1746                                 rte_errno = -error;
1747                                 break;
1748                         }
1749                 }
1750
1751                 error = rte_net_intel_cksum_prepare(m);
1752                 if (unlikely(error)) {
1753                         rte_errno = -error;
1754                         break;
1755                 }
1756
1757                 if (m->ol_flags & PKT_TX_TCP_SEG)
1758                         virtio_tso_fix_cksum(m);
1759         }
1760
1761         return nb_tx;
1762 }
1763
1764 uint16_t
1765 virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts,
1766                         uint16_t nb_pkts)
1767 {
1768         struct virtnet_tx *txvq = tx_queue;
1769         struct virtqueue *vq = virtnet_txq_to_vq(txvq);
1770         struct virtio_hw *hw = vq->hw;
1771         uint16_t hdr_size = hw->vtnet_hdr_size;
1772         uint16_t nb_tx = 0;
1773         bool in_order = virtio_with_feature(hw, VIRTIO_F_IN_ORDER);
1774
1775         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1776                 return nb_tx;
1777
1778         if (unlikely(nb_pkts < 1))
1779                 return nb_pkts;
1780
1781         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1782
1783         if (nb_pkts > vq->vq_free_cnt)
1784                 virtio_xmit_cleanup_packed(vq, nb_pkts - vq->vq_free_cnt,
1785                                            in_order);
1786
1787         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1788                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1789                 int can_push = 0, use_indirect = 0, slots, need;
1790
1791                 /* optimize ring usage */
1792                 if ((virtio_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1793                       virtio_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1794                     rte_mbuf_refcnt_read(txm) == 1 &&
1795                     RTE_MBUF_DIRECT(txm) &&
1796                     txm->nb_segs == 1 &&
1797                     rte_pktmbuf_headroom(txm) >= hdr_size &&
1798                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1799                            __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1800                         can_push = 1;
1801                 else if (virtio_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1802                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1803                         use_indirect = 1;
1804                 /* How many main ring entries are needed to this Tx?
1805                  * indirect   => 1
1806                  * any_layout => number of segments
1807                  * default    => number of segments + 1
1808                  */
1809                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1810                 need = slots - vq->vq_free_cnt;
1811
1812                 /* Positive value indicates it need free vring descriptors */
1813                 if (unlikely(need > 0)) {
1814                         virtio_xmit_cleanup_packed(vq, need, in_order);
1815                         need = slots - vq->vq_free_cnt;
1816                         if (unlikely(need > 0)) {
1817                                 PMD_TX_LOG(ERR,
1818                                            "No free tx descriptors to transmit");
1819                                 break;
1820                         }
1821                 }
1822
1823                 /* Enqueue Packet buffers */
1824                 if (can_push)
1825                         virtqueue_enqueue_xmit_packed_fast(txvq, txm, in_order);
1826                 else
1827                         virtqueue_enqueue_xmit_packed(txvq, txm, slots,
1828                                                       use_indirect, 0,
1829                                                       in_order);
1830
1831                 virtio_update_packet_stats(&txvq->stats, txm);
1832         }
1833
1834         txvq->stats.packets += nb_tx;
1835
1836         if (likely(nb_tx)) {
1837                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1838                         virtqueue_notify(vq);
1839                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1840                 }
1841         }
1842
1843         return nb_tx;
1844 }
1845
1846 uint16_t
1847 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
1848 {
1849         struct virtnet_tx *txvq = tx_queue;
1850         struct virtqueue *vq = virtnet_txq_to_vq(txvq);
1851         struct virtio_hw *hw = vq->hw;
1852         uint16_t hdr_size = hw->vtnet_hdr_size;
1853         uint16_t nb_used, nb_tx = 0;
1854
1855         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1856                 return nb_tx;
1857
1858         if (unlikely(nb_pkts < 1))
1859                 return nb_pkts;
1860
1861         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1862
1863         nb_used = virtqueue_nused(vq);
1864
1865         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1866                 virtio_xmit_cleanup(vq, nb_used);
1867
1868         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1869                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1870                 int can_push = 0, use_indirect = 0, slots, need;
1871
1872                 /* optimize ring usage */
1873                 if ((virtio_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1874                       virtio_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1875                     rte_mbuf_refcnt_read(txm) == 1 &&
1876                     RTE_MBUF_DIRECT(txm) &&
1877                     txm->nb_segs == 1 &&
1878                     rte_pktmbuf_headroom(txm) >= hdr_size &&
1879                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1880                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1881                         can_push = 1;
1882                 else if (virtio_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1883                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1884                         use_indirect = 1;
1885
1886                 /* How many main ring entries are needed to this Tx?
1887                  * any_layout => number of segments
1888                  * indirect   => 1
1889                  * default    => number of segments + 1
1890                  */
1891                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1892                 need = slots - vq->vq_free_cnt;
1893
1894                 /* Positive value indicates it need free vring descriptors */
1895                 if (unlikely(need > 0)) {
1896                         nb_used = virtqueue_nused(vq);
1897
1898                         need = RTE_MIN(need, (int)nb_used);
1899
1900                         virtio_xmit_cleanup(vq, need);
1901                         need = slots - vq->vq_free_cnt;
1902                         if (unlikely(need > 0)) {
1903                                 PMD_TX_LOG(ERR,
1904                                            "No free tx descriptors to transmit");
1905                                 break;
1906                         }
1907                 }
1908
1909                 /* Enqueue Packet buffers */
1910                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
1911                         can_push, 0);
1912
1913                 virtio_update_packet_stats(&txvq->stats, txm);
1914         }
1915
1916         txvq->stats.packets += nb_tx;
1917
1918         if (likely(nb_tx)) {
1919                 vq_update_avail_idx(vq);
1920
1921                 if (unlikely(virtqueue_kick_prepare(vq))) {
1922                         virtqueue_notify(vq);
1923                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1924                 }
1925         }
1926
1927         return nb_tx;
1928 }
1929
1930 static __rte_always_inline int
1931 virtio_xmit_try_cleanup_inorder(struct virtqueue *vq, uint16_t need)
1932 {
1933         uint16_t nb_used, nb_clean, nb_descs;
1934
1935         nb_descs = vq->vq_free_cnt + need;
1936         nb_used = virtqueue_nused(vq);
1937         nb_clean = RTE_MIN(need, (int)nb_used);
1938
1939         virtio_xmit_cleanup_inorder(vq, nb_clean);
1940
1941         return nb_descs - vq->vq_free_cnt;
1942 }
1943
1944 uint16_t
1945 virtio_xmit_pkts_inorder(void *tx_queue,
1946                         struct rte_mbuf **tx_pkts,
1947                         uint16_t nb_pkts)
1948 {
1949         struct virtnet_tx *txvq = tx_queue;
1950         struct virtqueue *vq = virtnet_txq_to_vq(txvq);
1951         struct virtio_hw *hw = vq->hw;
1952         uint16_t hdr_size = hw->vtnet_hdr_size;
1953         uint16_t nb_used, nb_tx = 0, nb_inorder_pkts = 0;
1954         struct rte_mbuf *inorder_pkts[nb_pkts];
1955         int need;
1956
1957         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1958                 return nb_tx;
1959
1960         if (unlikely(nb_pkts < 1))
1961                 return nb_pkts;
1962
1963         VIRTQUEUE_DUMP(vq);
1964         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1965         nb_used = virtqueue_nused(vq);
1966
1967         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1968                 virtio_xmit_cleanup_inorder(vq, nb_used);
1969
1970         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1971                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1972                 int slots;
1973
1974                 /* optimize ring usage */
1975                 if ((virtio_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1976                      virtio_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1977                      rte_mbuf_refcnt_read(txm) == 1 &&
1978                      RTE_MBUF_DIRECT(txm) &&
1979                      txm->nb_segs == 1 &&
1980                      rte_pktmbuf_headroom(txm) >= hdr_size &&
1981                      rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1982                                 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
1983                         inorder_pkts[nb_inorder_pkts] = txm;
1984                         nb_inorder_pkts++;
1985
1986                         continue;
1987                 }
1988
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 "
1997                                                 "transmit");
1998                                         break;
1999                                 }
2000                         }
2001                         virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2002                                                         nb_inorder_pkts);
2003                         nb_inorder_pkts = 0;
2004                 }
2005
2006                 slots = txm->nb_segs + 1;
2007                 need = slots - vq->vq_free_cnt;
2008                 if (unlikely(need > 0)) {
2009                         need = virtio_xmit_try_cleanup_inorder(vq, slots);
2010
2011                         if (unlikely(need > 0)) {
2012                                 PMD_TX_LOG(ERR,
2013                                         "No free tx descriptors to transmit");
2014                                 break;
2015                         }
2016                 }
2017                 /* Enqueue Packet buffers */
2018                 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
2019
2020                 virtio_update_packet_stats(&txvq->stats, txm);
2021         }
2022
2023         /* Transmit all inorder packets */
2024         if (nb_inorder_pkts) {
2025                 need = nb_inorder_pkts - vq->vq_free_cnt;
2026                 if (unlikely(need > 0)) {
2027                         need = virtio_xmit_try_cleanup_inorder(vq,
2028                                                                   need);
2029                         if (unlikely(need > 0)) {
2030                                 PMD_TX_LOG(ERR,
2031                                         "No free tx descriptors to transmit");
2032                                 nb_inorder_pkts = vq->vq_free_cnt;
2033                                 nb_tx -= need;
2034                         }
2035                 }
2036
2037                 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2038                                                 nb_inorder_pkts);
2039         }
2040
2041         txvq->stats.packets += nb_tx;
2042
2043         if (likely(nb_tx)) {
2044                 vq_update_avail_idx(vq);
2045
2046                 if (unlikely(virtqueue_kick_prepare(vq))) {
2047                         virtqueue_notify(vq);
2048                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2049                 }
2050         }
2051
2052         VIRTQUEUE_DUMP(vq);
2053
2054         return nb_tx;
2055 }
2056
2057 __rte_weak uint16_t
2058 virtio_recv_pkts_packed_vec(void *rx_queue __rte_unused,
2059                             struct rte_mbuf **rx_pkts __rte_unused,
2060                             uint16_t nb_pkts __rte_unused)
2061 {
2062         return 0;
2063 }
2064
2065 __rte_weak uint16_t
2066 virtio_xmit_pkts_packed_vec(void *tx_queue __rte_unused,
2067                             struct rte_mbuf **tx_pkts __rte_unused,
2068                             uint16_t nb_pkts __rte_unused)
2069 {
2070         return 0;
2071 }