drivers/net/virtio/virtio_rxtx.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <stdint.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <errno.h>
  10
  11 #include <rte_cycles.h>
  12 #include <rte_memory.h>
  13 #include <rte_branch_prediction.h>
  14 #include <rte_mempool.h>
  15 #include <rte_malloc.h>
  16 #include <rte_mbuf.h>
  17 #include <rte_ether.h>
  18 #include <rte_ethdev_driver.h>
  19 #include <rte_prefetch.h>
  20 #include <rte_string_fns.h>
  21 #include <rte_errno.h>
  22 #include <rte_byteorder.h>
  23 #include <rte_net.h>
  24 #include <rte_ip.h>
  25 #include <rte_udp.h>
  26 #include <rte_tcp.h>
  27
  28 #include "virtio_logs.h"
  29 #include "virtio_ethdev.h"
  30 #include "virtio_pci.h"
  31 #include "virtqueue.h"
  32 #include "virtio_rxtx.h"
  33 #include "virtio_rxtx_simple.h"
  34 #include "virtio_ring.h"
  35
  36 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
  37 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
  38 #else
  39 #define  VIRTIO_DUMP_PACKET(m, len) do { } while (0)
  40 #endif
  41
  42 int
  43 virtio_dev_rx_queue_done(void *rxq, uint16_t offset)
  44 {
  45         struct virtnet_rx *rxvq = rxq;
  46         struct virtqueue *vq = rxvq->vq;
  47
  48         return VIRTQUEUE_NUSED(vq) >= offset;
  49 }
  50
  51 void
  52 vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num)
  53 {
  54         vq->vq_free_cnt += num;
  55         vq->vq_desc_tail_idx = desc_idx & (vq->vq_nentries - 1);
  56 }
  57
  58 void
  59 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
  60 {
  61         struct vring_desc *dp, *dp_tail;
  62         struct vq_desc_extra *dxp;
  63         uint16_t desc_idx_last = desc_idx;
  64
  65         dp  = &vq->vq_split.ring.desc[desc_idx];
  66         dxp = &vq->vq_descx[desc_idx];
  67         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
  68         if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
  69                 while (dp->flags & VRING_DESC_F_NEXT) {
  70                         desc_idx_last = dp->next;
  71                         dp = &vq->vq_split.ring.desc[dp->next];
  72                 }
  73         }
  74         dxp->ndescs = 0;
  75
  76         /*
  77          * We must append the existing free chain, if any, to the end of
  78          * newly freed chain. If the virtqueue was completely used, then
  79          * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
  80          */
  81         if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
  82                 vq->vq_desc_head_idx = desc_idx;
  83         } else {
  84                 dp_tail = &vq->vq_split.ring.desc[vq->vq_desc_tail_idx];
  85                 dp_tail->next = desc_idx;
  86         }
  87
  88         vq->vq_desc_tail_idx = desc_idx_last;
  89         dp->next = VQ_RING_DESC_CHAIN_END;
  90 }
  91
  92 static void
  93 vq_ring_free_id_packed(struct virtqueue *vq, uint16_t id)
  94 {
  95         struct vq_desc_extra *dxp;
  96
  97         dxp = &vq->vq_descx[id];
  98         vq->vq_free_cnt += dxp->ndescs;
  99
 100         if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END)
 101                 vq->vq_desc_head_idx = id;
 102         else
 103                 vq->vq_descx[vq->vq_desc_tail_idx].next = id;
 104
 105         vq->vq_desc_tail_idx = id;
 106         dxp->next = VQ_RING_DESC_CHAIN_END;
 107 }
 108
 109 static inline void
 110 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
 111 {
 112         uint32_t s = mbuf->pkt_len;
 113         struct rte_ether_addr *ea;
 114
 115         stats->bytes += s;
 116
 117         if (s == 64) {
 118                 stats->size_bins[1]++;
 119         } else if (s > 64 && s < 1024) {
 120                 uint32_t bin;
 121
 122                 /* count zeros, and offset into correct bin */
 123                 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
 124                 stats->size_bins[bin]++;
 125         } else {
 126                 if (s < 64)
 127                         stats->size_bins[0]++;
 128                 else if (s < 1519)
 129                         stats->size_bins[6]++;
 130                 else
 131                         stats->size_bins[7]++;
 132         }
 133
 134         ea = rte_pktmbuf_mtod(mbuf, struct rte_ether_addr *);
 135         if (rte_is_multicast_ether_addr(ea)) {
 136                 if (rte_is_broadcast_ether_addr(ea))
 137                         stats->broadcast++;
 138                 else
 139                         stats->multicast++;
 140         }
 141 }
 142
 143 static inline void
 144 virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
 145 {
 146         VIRTIO_DUMP_PACKET(m, m->data_len);
 147
 148         virtio_update_packet_stats(&rxvq->stats, m);
 149 }
 150
 151 static uint16_t
 152 virtqueue_dequeue_burst_rx_packed(struct virtqueue *vq,
 153                                   struct rte_mbuf **rx_pkts,
 154                                   uint32_t *len,
 155                                   uint16_t num)
 156 {
 157         struct rte_mbuf *cookie;
 158         uint16_t used_idx;
 159         uint16_t id;
 160         struct vring_packed_desc *desc;
 161         uint16_t i;
 162
 163         desc = vq->vq_packed.ring.desc;
 164
 165         for (i = 0; i < num; i++) {
 166                 used_idx = vq->vq_used_cons_idx;
 167                 if (!desc_is_used(&desc[used_idx], vq))
 168                         return i;
 169                 virtio_rmb(vq->hw->weak_barriers);
 170                 len[i] = desc[used_idx].len;
 171                 id = desc[used_idx].id;
 172                 cookie = (struct rte_mbuf *)vq->vq_descx[id].cookie;
 173                 if (unlikely(cookie == NULL)) {
 174                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 175                                 vq->vq_used_cons_idx);
 176                         break;
 177                 }
 178                 rte_prefetch0(cookie);
 179                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 180                 rx_pkts[i] = cookie;
 181
 182                 vq->vq_free_cnt++;
 183                 vq->vq_used_cons_idx++;
 184                 if (vq->vq_used_cons_idx >= vq->vq_nentries) {
 185                         vq->vq_used_cons_idx -= vq->vq_nentries;
 186                         vq->vq_packed.used_wrap_counter ^= 1;
 187                 }
 188         }
 189
 190         return i;
 191 }
 192
 193 static uint16_t
 194 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
 195                            uint32_t *len, uint16_t num)
 196 {
 197         struct vring_used_elem *uep;
 198         struct rte_mbuf *cookie;
 199         uint16_t used_idx, desc_idx;
 200         uint16_t i;
 201
 202         /*  Caller does the check */
 203         for (i = 0; i < num ; i++) {
 204                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
 205                 uep = &vq->vq_split.ring.used->ring[used_idx];
 206                 desc_idx = (uint16_t) uep->id;
 207                 len[i] = uep->len;
 208                 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
 209
 210                 if (unlikely(cookie == NULL)) {
 211                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 212                                 vq->vq_used_cons_idx);
 213                         break;
 214                 }
 215
 216                 rte_prefetch0(cookie);
 217                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 218                 rx_pkts[i]  = cookie;
 219                 vq->vq_used_cons_idx++;
 220                 vq_ring_free_chain(vq, desc_idx);
 221                 vq->vq_descx[desc_idx].cookie = NULL;
 222         }
 223
 224         return i;
 225 }
 226
 227 static uint16_t
 228 virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
 229                         struct rte_mbuf **rx_pkts,
 230                         uint32_t *len,
 231                         uint16_t num)
 232 {
 233         struct vring_used_elem *uep;
 234         struct rte_mbuf *cookie;
 235         uint16_t used_idx = 0;
 236         uint16_t i;
 237
 238         if (unlikely(num == 0))
 239                 return 0;
 240
 241         for (i = 0; i < num; i++) {
 242                 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
 243                 /* Desc idx same as used idx */
 244                 uep = &vq->vq_split.ring.used->ring[used_idx];
 245                 len[i] = uep->len;
 246                 cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
 247
 248                 if (unlikely(cookie == NULL)) {
 249                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 250                                 vq->vq_used_cons_idx);
 251                         break;
 252                 }
 253
 254                 rte_prefetch0(cookie);
 255                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 256                 rx_pkts[i]  = cookie;
 257                 vq->vq_used_cons_idx++;
 258                 vq->vq_descx[used_idx].cookie = NULL;
 259         }
 260
 261         vq_ring_free_inorder(vq, used_idx, i);
 262         return i;
 263 }
 264
 265 #ifndef DEFAULT_TX_FREE_THRESH
 266 #define DEFAULT_TX_FREE_THRESH 32
 267 #endif
 268
 269 static void
 270 virtio_xmit_cleanup_inorder_packed(struct virtqueue *vq, int num)
 271 {
 272         uint16_t used_idx, id, curr_id, free_cnt = 0;
 273         uint16_t size = vq->vq_nentries;
 274         struct vring_packed_desc *desc = vq->vq_packed.ring.desc;
 275         struct vq_desc_extra *dxp;
 276
 277         used_idx = vq->vq_used_cons_idx;
 278         while (num > 0 && desc_is_used(&desc[used_idx], vq)) {
 279                 virtio_rmb(vq->hw->weak_barriers);
 280                 id = desc[used_idx].id;
 281                 do {
 282                         curr_id = used_idx;
 283                         dxp = &vq->vq_descx[used_idx];
 284                         used_idx += dxp->ndescs;
 285                         free_cnt += dxp->ndescs;
 286                         num -= dxp->ndescs;
 287                         if (used_idx >= size) {
 288                                 used_idx -= size;
 289                                 vq->vq_packed.used_wrap_counter ^= 1;
 290                         }
 291                         if (dxp->cookie != NULL) {
 292                                 rte_pktmbuf_free(dxp->cookie);
 293                                 dxp->cookie = NULL;
 294                         }
 295                 } while (curr_id != id);
 296         }
 297         vq->vq_used_cons_idx = used_idx;
 298         vq->vq_free_cnt += free_cnt;
 299 }
 300
 301 static void
 302 virtio_xmit_cleanup_normal_packed(struct virtqueue *vq, int num)
 303 {
 304         uint16_t used_idx, id;
 305         uint16_t size = vq->vq_nentries;
 306         struct vring_packed_desc *desc = vq->vq_packed.ring.desc;
 307         struct vq_desc_extra *dxp;
 308
 309         used_idx = vq->vq_used_cons_idx;
 310         while (num-- && desc_is_used(&desc[used_idx], vq)) {
 311                 virtio_rmb(vq->hw->weak_barriers);
 312                 id = desc[used_idx].id;
 313                 dxp = &vq->vq_descx[id];
 314                 vq->vq_used_cons_idx += dxp->ndescs;
 315                 if (vq->vq_used_cons_idx >= size) {
 316                         vq->vq_used_cons_idx -= size;
 317                         vq->vq_packed.used_wrap_counter ^= 1;
 318                 }
 319                 vq_ring_free_id_packed(vq, id);
 320                 if (dxp->cookie != NULL) {
 321                         rte_pktmbuf_free(dxp->cookie);
 322                         dxp->cookie = NULL;
 323                 }
 324                 used_idx = vq->vq_used_cons_idx;
 325         }
 326 }
 327
 328 /* Cleanup from completed transmits. */
 329 static inline void
 330 virtio_xmit_cleanup_packed(struct virtqueue *vq, int num, int in_order)
 331 {
 332         if (in_order)
 333                 virtio_xmit_cleanup_inorder_packed(vq, num);
 334         else
 335                 virtio_xmit_cleanup_normal_packed(vq, num);
 336 }
 337
 338 static void
 339 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
 340 {
 341         uint16_t i, used_idx, desc_idx;
 342         for (i = 0; i < num; i++) {
 343                 struct vring_used_elem *uep;
 344                 struct vq_desc_extra *dxp;
 345
 346                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
 347                 uep = &vq->vq_split.ring.used->ring[used_idx];
 348
 349                 desc_idx = (uint16_t) uep->id;
 350                 dxp = &vq->vq_descx[desc_idx];
 351                 vq->vq_used_cons_idx++;
 352                 vq_ring_free_chain(vq, desc_idx);
 353
 354                 if (dxp->cookie != NULL) {
 355                         rte_pktmbuf_free(dxp->cookie);
 356                         dxp->cookie = NULL;
 357                 }
 358         }
 359 }
 360
 361 /* Cleanup from completed inorder transmits. */
 362 static __rte_always_inline void
 363 virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num)
 364 {
 365         uint16_t i, idx = vq->vq_used_cons_idx;
 366         int16_t free_cnt = 0;
 367         struct vq_desc_extra *dxp = NULL;
 368
 369         if (unlikely(num == 0))
 370                 return;
 371
 372         for (i = 0; i < num; i++) {
 373                 dxp = &vq->vq_descx[idx++ & (vq->vq_nentries - 1)];
 374                 free_cnt += dxp->ndescs;
 375                 if (dxp->cookie != NULL) {
 376                         rte_pktmbuf_free(dxp->cookie);
 377                         dxp->cookie = NULL;
 378                 }
 379         }
 380
 381         vq->vq_free_cnt += free_cnt;
 382         vq->vq_used_cons_idx = idx;
 383 }
 384
 385 static inline int
 386 virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
 387                         struct rte_mbuf **cookies,
 388                         uint16_t num)
 389 {
 390         struct vq_desc_extra *dxp;
 391         struct virtio_hw *hw = vq->hw;
 392         struct vring_desc *start_dp;
 393         uint16_t head_idx, idx, i = 0;
 394
 395         if (unlikely(vq->vq_free_cnt == 0))
 396                 return -ENOSPC;
 397         if (unlikely(vq->vq_free_cnt < num))
 398                 return -EMSGSIZE;
 399
 400         head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
 401         start_dp = vq->vq_split.ring.desc;
 402
 403         while (i < num) {
 404                 idx = head_idx & (vq->vq_nentries - 1);
 405                 dxp = &vq->vq_descx[idx];
 406                 dxp->cookie = (void *)cookies[i];
 407                 dxp->ndescs = 1;
 408
 409                 start_dp[idx].addr =
 410                                 VIRTIO_MBUF_ADDR(cookies[i], vq) +
 411                                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 412                 start_dp[idx].len =
 413                                 cookies[i]->buf_len -
 414                                 RTE_PKTMBUF_HEADROOM +
 415                                 hw->vtnet_hdr_size;
 416                 start_dp[idx].flags =  VRING_DESC_F_WRITE;
 417
 418                 vq_update_avail_ring(vq, idx);
 419                 head_idx++;
 420                 i++;
 421         }
 422
 423         vq->vq_desc_head_idx += num;
 424         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 425         return 0;
 426 }
 427
 428 static inline int
 429 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf **cookie,
 430                                 uint16_t num)
 431 {
 432         struct vq_desc_extra *dxp;
 433         struct virtio_hw *hw = vq->hw;
 434         struct vring_desc *start_dp = vq->vq_split.ring.desc;
 435         uint16_t idx, i;
 436
 437         if (unlikely(vq->vq_free_cnt == 0))
 438                 return -ENOSPC;
 439         if (unlikely(vq->vq_free_cnt < num))
 440                 return -EMSGSIZE;
 441
 442         if (unlikely(vq->vq_desc_head_idx >= vq->vq_nentries))
 443                 return -EFAULT;
 444
 445         for (i = 0; i < num; i++) {
 446                 idx = vq->vq_desc_head_idx;
 447                 dxp = &vq->vq_descx[idx];
 448                 dxp->cookie = (void *)cookie[i];
 449                 dxp->ndescs = 1;
 450
 451                 start_dp[idx].addr =
 452                         VIRTIO_MBUF_ADDR(cookie[i], vq) +
 453                         RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 454                 start_dp[idx].len =
 455                         cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM +
 456                         hw->vtnet_hdr_size;
 457                 start_dp[idx].flags = VRING_DESC_F_WRITE;
 458                 vq->vq_desc_head_idx = start_dp[idx].next;
 459                 vq_update_avail_ring(vq, idx);
 460                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) {
 461                         vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
 462                         break;
 463                 }
 464         }
 465
 466         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 467
 468         return 0;
 469 }
 470
 471 static inline int
 472 virtqueue_enqueue_recv_refill_packed(struct virtqueue *vq,
 473                                      struct rte_mbuf **cookie, uint16_t num)
 474 {
 475         struct vring_packed_desc *start_dp = vq->vq_packed.ring.desc;
 476         uint16_t flags = vq->vq_packed.cached_flags;
 477         struct virtio_hw *hw = vq->hw;
 478         struct vq_desc_extra *dxp;
 479         uint16_t idx;
 480         int i;
 481
 482         if (unlikely(vq->vq_free_cnt == 0))
 483                 return -ENOSPC;
 484         if (unlikely(vq->vq_free_cnt < num))
 485                 return -EMSGSIZE;
 486
 487         for (i = 0; i < num; i++) {
 488                 idx = vq->vq_avail_idx;
 489                 dxp = &vq->vq_descx[idx];
 490                 dxp->cookie = (void *)cookie[i];
 491                 dxp->ndescs = 1;
 492
 493                 start_dp[idx].addr = VIRTIO_MBUF_ADDR(cookie[i], vq) +
 494                                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 495                 start_dp[idx].len = cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM
 496                                         + hw->vtnet_hdr_size;
 497
 498                 vq->vq_desc_head_idx = dxp->next;
 499                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 500                         vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
 501                 virtio_wmb(hw->weak_barriers);
 502                 start_dp[idx].flags = flags;
 503                 if (++vq->vq_avail_idx >= vq->vq_nentries) {
 504                         vq->vq_avail_idx -= vq->vq_nentries;
 505                         vq->vq_packed.cached_flags ^=
 506                                 VRING_PACKED_DESC_F_AVAIL_USED;
 507                         flags = vq->vq_packed.cached_flags;
 508                 }
 509         }
 510         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 511         return 0;
 512 }
 513
 514 /* When doing TSO, the IP length is not included in the pseudo header
 515  * checksum of the packet given to the PMD, but for virtio it is
 516  * expected.
 517  */
 518 static void
 519 virtio_tso_fix_cksum(struct rte_mbuf *m)
 520 {
 521         /* common case: header is not fragmented */
 522         if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
 523                         m->l4_len)) {
 524                 struct rte_ipv4_hdr *iph;
 525                 struct rte_ipv6_hdr *ip6h;
 526                 struct rte_tcp_hdr *th;
 527                 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
 528                 uint32_t tmp;
 529
 530                 iph = rte_pktmbuf_mtod_offset(m,
 531                                         struct rte_ipv4_hdr *, m->l2_len);
 532                 th = RTE_PTR_ADD(iph, m->l3_len);
 533                 if ((iph->version_ihl >> 4) == 4) {
 534                         iph->hdr_checksum = 0;
 535                         iph->hdr_checksum = rte_ipv4_cksum(iph);
 536                         ip_len = iph->total_length;
 537                         ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
 538                                 m->l3_len);
 539                 } else {
 540                         ip6h = (struct rte_ipv6_hdr *)iph;
 541                         ip_paylen = ip6h->payload_len;
 542                 }
 543
 544                 /* calculate the new phdr checksum not including ip_paylen */
 545                 prev_cksum = th->cksum;
 546                 tmp = prev_cksum;
 547                 tmp += ip_paylen;
 548                 tmp = (tmp & 0xffff) + (tmp >> 16);
 549                 new_cksum = tmp;
 550
 551                 /* replace it in the packet */
 552                 th->cksum = new_cksum;
 553         }
 554 }
 555
 556
 557 /* avoid write operation when necessary, to lessen cache issues */
 558 #define ASSIGN_UNLESS_EQUAL(var, val) do {      \
 559         if ((var) != (val))                     \
 560                 (var) = (val);                  \
 561 } while (0)
 562
 563 #define virtqueue_clear_net_hdr(_hdr) do {              \
 564         ASSIGN_UNLESS_EQUAL((_hdr)->csum_start, 0);     \
 565         ASSIGN_UNLESS_EQUAL((_hdr)->csum_offset, 0);    \
 566         ASSIGN_UNLESS_EQUAL((_hdr)->flags, 0);          \
 567         ASSIGN_UNLESS_EQUAL((_hdr)->gso_type, 0);       \
 568         ASSIGN_UNLESS_EQUAL((_hdr)->gso_size, 0);       \
 569         ASSIGN_UNLESS_EQUAL((_hdr)->hdr_len, 0);        \
 570 } while (0)
 571
 572 static inline void
 573 virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
 574                         struct rte_mbuf *cookie,
 575                         bool offload)
 576 {
 577         if (offload) {
 578                 if (cookie->ol_flags & PKT_TX_TCP_SEG)
 579                         cookie->ol_flags |= PKT_TX_TCP_CKSUM;
 580
 581                 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
 582                 case PKT_TX_UDP_CKSUM:
 583                         hdr->csum_start = cookie->l2_len + cookie->l3_len;
 584                         hdr->csum_offset = offsetof(struct rte_udp_hdr,
 585                                 dgram_cksum);
 586                         hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 587                         break;
 588
 589                 case PKT_TX_TCP_CKSUM:
 590                         hdr->csum_start = cookie->l2_len + cookie->l3_len;
 591                         hdr->csum_offset = offsetof(struct rte_tcp_hdr, cksum);
 592                         hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 593                         break;
 594
 595                 default:
 596                         ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
 597                         ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
 598                         ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
 599                         break;
 600                 }
 601
 602                 /* TCP Segmentation Offload */
 603                 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
 604                         hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
 605                                 VIRTIO_NET_HDR_GSO_TCPV6 :
 606                                 VIRTIO_NET_HDR_GSO_TCPV4;
 607                         hdr->gso_size = cookie->tso_segsz;
 608                         hdr->hdr_len =
 609                                 cookie->l2_len +
 610                                 cookie->l3_len +
 611                                 cookie->l4_len;
 612                 } else {
 613                         ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
 614                         ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
 615                         ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
 616                 }
 617         }
 618 }
 619
 620 static inline void
 621 virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
 622                         struct rte_mbuf **cookies,
 623                         uint16_t num)
 624 {
 625         struct vq_desc_extra *dxp;
 626         struct virtqueue *vq = txvq->vq;
 627         struct vring_desc *start_dp;
 628         struct virtio_net_hdr *hdr;
 629         uint16_t idx;
 630         uint16_t head_size = vq->hw->vtnet_hdr_size;
 631         uint16_t i = 0;
 632
 633         idx = vq->vq_desc_head_idx;
 634         start_dp = vq->vq_split.ring.desc;
 635
 636         while (i < num) {
 637                 idx = idx & (vq->vq_nentries - 1);
 638                 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
 639                 dxp->cookie = (void *)cookies[i];
 640                 dxp->ndescs = 1;
 641                 virtio_update_packet_stats(&txvq->stats, cookies[i]);
 642
 643                 hdr = (struct virtio_net_hdr *)
 644                         rte_pktmbuf_prepend(cookies[i], head_size);
 645                 cookies[i]->pkt_len -= head_size;
 646
 647                 /* if offload disabled, hdr is not zeroed yet, do it now */
 648                 if (!vq->hw->has_tx_offload)
 649                         virtqueue_clear_net_hdr(hdr);
 650                 else
 651                         virtqueue_xmit_offload(hdr, cookies[i], true);
 652
 653                 start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq);
 654                 start_dp[idx].len   = cookies[i]->data_len;
 655                 start_dp[idx].flags = 0;
 656
 657                 vq_update_avail_ring(vq, idx);
 658
 659                 idx++;
 660                 i++;
 661         };
 662
 663         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 664         vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
 665 }
 666
 667 static inline void
 668 virtqueue_enqueue_xmit_packed_fast(struct virtnet_tx *txvq,
 669                                    struct rte_mbuf *cookie,
 670                                    int in_order)
 671 {
 672         struct virtqueue *vq = txvq->vq;
 673         struct vring_packed_desc *dp;
 674         struct vq_desc_extra *dxp;
 675         uint16_t idx, id, flags;
 676         uint16_t head_size = vq->hw->vtnet_hdr_size;
 677         struct virtio_net_hdr *hdr;
 678
 679         id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
 680         idx = vq->vq_avail_idx;
 681         dp = &vq->vq_packed.ring.desc[idx];
 682
 683         dxp = &vq->vq_descx[id];
 684         dxp->ndescs = 1;
 685         dxp->cookie = cookie;
 686
 687         flags = vq->vq_packed.cached_flags;
 688
 689         /* prepend cannot fail, checked by caller */
 690         hdr = (struct virtio_net_hdr *)
 691                 rte_pktmbuf_prepend(cookie, head_size);
 692         cookie->pkt_len -= head_size;
 693
 694         /* if offload disabled, hdr is not zeroed yet, do it now */
 695         if (!vq->hw->has_tx_offload)
 696                 virtqueue_clear_net_hdr(hdr);
 697         else
 698                 virtqueue_xmit_offload(hdr, cookie, true);
 699
 700         dp->addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 701         dp->len  = cookie->data_len;
 702         dp->id   = id;
 703
 704         if (++vq->vq_avail_idx >= vq->vq_nentries) {
 705                 vq->vq_avail_idx -= vq->vq_nentries;
 706                 vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED;
 707         }
 708
 709         vq->vq_free_cnt--;
 710
 711         if (!in_order) {
 712                 vq->vq_desc_head_idx = dxp->next;
 713                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 714                         vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
 715         }
 716
 717         virtio_wmb(vq->hw->weak_barriers);
 718         dp->flags = flags;
 719 }
 720
 721 static inline void
 722 virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 723                               uint16_t needed, int can_push, int in_order)
 724 {
 725         struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 726         struct vq_desc_extra *dxp;
 727         struct virtqueue *vq = txvq->vq;
 728         struct vring_packed_desc *start_dp, *head_dp;
 729         uint16_t idx, id, head_idx, head_flags;
 730         uint16_t head_size = vq->hw->vtnet_hdr_size;
 731         struct virtio_net_hdr *hdr;
 732         uint16_t prev;
 733
 734         id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
 735
 736         dxp = &vq->vq_descx[id];
 737         dxp->ndescs = needed;
 738         dxp->cookie = cookie;
 739
 740         head_idx = vq->vq_avail_idx;
 741         idx = head_idx;
 742         prev = head_idx;
 743         start_dp = vq->vq_packed.ring.desc;
 744
 745         head_dp = &vq->vq_packed.ring.desc[idx];
 746         head_flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 747         head_flags |= vq->vq_packed.cached_flags;
 748
 749         if (can_push) {
 750                 /* prepend cannot fail, checked by caller */
 751                 hdr = (struct virtio_net_hdr *)
 752                         rte_pktmbuf_prepend(cookie, head_size);
 753                 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
 754                  * which is wrong. Below subtract restores correct pkt size.
 755                  */
 756                 cookie->pkt_len -= head_size;
 757
 758                 /* if offload disabled, it is not zeroed below, do it now */
 759                 if (!vq->hw->has_tx_offload)
 760                         virtqueue_clear_net_hdr(hdr);
 761         } else {
 762                 /* setup first tx ring slot to point to header
 763                  * stored in reserved region.
 764                  */
 765                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 766                         RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
 767                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
 768                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 769                 idx++;
 770                 if (idx >= vq->vq_nentries) {
 771                         idx -= vq->vq_nentries;
 772                         vq->vq_packed.cached_flags ^=
 773                                 VRING_PACKED_DESC_F_AVAIL_USED;
 774                 }
 775         }
 776
 777         virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
 778
 779         do {
 780                 uint16_t flags;
 781
 782                 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 783                 start_dp[idx].len  = cookie->data_len;
 784                 if (likely(idx != head_idx)) {
 785                         flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 786                         flags |= vq->vq_packed.cached_flags;
 787                         start_dp[idx].flags = flags;
 788                 }
 789                 prev = idx;
 790                 idx++;
 791                 if (idx >= vq->vq_nentries) {
 792                         idx -= vq->vq_nentries;
 793                         vq->vq_packed.cached_flags ^=
 794                                 VRING_PACKED_DESC_F_AVAIL_USED;
 795                 }
 796         } while ((cookie = cookie->next) != NULL);
 797
 798         start_dp[prev].id = id;
 799
 800         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 801         vq->vq_avail_idx = idx;
 802
 803         if (!in_order) {
 804                 vq->vq_desc_head_idx = dxp->next;
 805                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 806                         vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
 807         }
 808
 809         virtio_wmb(vq->hw->weak_barriers);
 810         head_dp->flags = head_flags;
 811 }
 812
 813 static inline void
 814 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 815                         uint16_t needed, int use_indirect, int can_push,
 816                         int in_order)
 817 {
 818         struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 819         struct vq_desc_extra *dxp;
 820         struct virtqueue *vq = txvq->vq;
 821         struct vring_desc *start_dp;
 822         uint16_t seg_num = cookie->nb_segs;
 823         uint16_t head_idx, idx;
 824         uint16_t head_size = vq->hw->vtnet_hdr_size;
 825         struct virtio_net_hdr *hdr;
 826
 827         head_idx = vq->vq_desc_head_idx;
 828         idx = head_idx;
 829         if (in_order)
 830                 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
 831         else
 832                 dxp = &vq->vq_descx[idx];
 833         dxp->cookie = (void *)cookie;
 834         dxp->ndescs = needed;
 835
 836         start_dp = vq->vq_split.ring.desc;
 837
 838         if (can_push) {
 839                 /* prepend cannot fail, checked by caller */
 840                 hdr = (struct virtio_net_hdr *)
 841                         rte_pktmbuf_prepend(cookie, head_size);
 842                 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
 843                  * which is wrong. Below subtract restores correct pkt size.
 844                  */
 845                 cookie->pkt_len -= head_size;
 846
 847                 /* if offload disabled, it is not zeroed below, do it now */
 848                 if (!vq->hw->has_tx_offload)
 849                         virtqueue_clear_net_hdr(hdr);
 850         } else if (use_indirect) {
 851                 /* setup tx ring slot to point to indirect
 852                  * descriptor list stored in reserved region.
 853                  *
 854                  * the first slot in indirect ring is already preset
 855                  * to point to the header in reserved region
 856                  */
 857                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 858                         RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
 859                 start_dp[idx].len   = (seg_num + 1) * sizeof(struct vring_desc);
 860                 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
 861                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 862
 863                 /* loop below will fill in rest of the indirect elements */
 864                 start_dp = txr[idx].tx_indir;
 865                 idx = 1;
 866         } else {
 867                 /* setup first tx ring slot to point to header
 868                  * stored in reserved region.
 869                  */
 870                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 871                         RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
 872                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
 873                 start_dp[idx].flags = VRING_DESC_F_NEXT;
 874                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 875
 876                 idx = start_dp[idx].next;
 877         }
 878
 879         virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
 880
 881         do {
 882                 start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 883                 start_dp[idx].len   = cookie->data_len;
 884                 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 885                 idx = start_dp[idx].next;
 886         } while ((cookie = cookie->next) != NULL);
 887
 888         if (use_indirect)
 889                 idx = vq->vq_split.ring.desc[head_idx].next;
 890
 891         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 892
 893         vq->vq_desc_head_idx = idx;
 894         vq_update_avail_ring(vq, head_idx);
 895
 896         if (!in_order) {
 897                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 898                         vq->vq_desc_tail_idx = idx;
 899         }
 900 }
 901
 902 void
 903 virtio_dev_cq_start(struct rte_eth_dev *dev)
 904 {
 905         struct virtio_hw *hw = dev->data->dev_private;
 906
 907         if (hw->cvq && hw->cvq->vq) {
 908                 rte_spinlock_init(&hw->cvq->lock);
 909                 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
 910         }
 911 }
 912
 913 int
 914 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
 915                         uint16_t queue_idx,
 916                         uint16_t nb_desc,
 917                         unsigned int socket_id __rte_unused,
 918                         const struct rte_eth_rxconf *rx_conf __rte_unused,
 919                         struct rte_mempool *mp)
 920 {
 921         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 922         struct virtio_hw *hw = dev->data->dev_private;
 923         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 924         struct virtnet_rx *rxvq;
 925
 926         PMD_INIT_FUNC_TRACE();
 927
 928         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
 929                 nb_desc = vq->vq_nentries;
 930         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 931
 932         rxvq = &vq->rxq;
 933         rxvq->queue_id = queue_idx;
 934         rxvq->mpool = mp;
 935         dev->data->rx_queues[queue_idx] = rxvq;
 936
 937         return 0;
 938 }
 939
 940 int
 941 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
 942 {
 943         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 944         struct virtio_hw *hw = dev->data->dev_private;
 945         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 946         struct virtnet_rx *rxvq = &vq->rxq;
 947         struct rte_mbuf *m;
 948         uint16_t desc_idx;
 949         int error, nbufs, i;
 950
 951         PMD_INIT_FUNC_TRACE();
 952
 953         /* Allocate blank mbufs for the each rx descriptor */
 954         nbufs = 0;
 955
 956         if (hw->use_simple_rx) {
 957                 for (desc_idx = 0; desc_idx < vq->vq_nentries;
 958                      desc_idx++) {
 959                         vq->vq_split.ring.avail->ring[desc_idx] = desc_idx;
 960                         vq->vq_split.ring.desc[desc_idx].flags =
 961                                 VRING_DESC_F_WRITE;
 962                 }
 963
 964                 virtio_rxq_vec_setup(rxvq);
 965         }
 966
 967         memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
 968         for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
 969              desc_idx++) {
 970                 vq->sw_ring[vq->vq_nentries + desc_idx] =
 971                         &rxvq->fake_mbuf;
 972         }
 973
 974         if (hw->use_simple_rx) {
 975                 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
 976                         virtio_rxq_rearm_vec(rxvq);
 977                         nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
 978                 }
 979         } else if (hw->use_inorder_rx) {
 980                 if ((!virtqueue_full(vq))) {
 981                         uint16_t free_cnt = vq->vq_free_cnt;
 982                         struct rte_mbuf *pkts[free_cnt];
 983
 984                         if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
 985                                 free_cnt)) {
 986                                 error = virtqueue_enqueue_refill_inorder(vq,
 987                                                 pkts,
 988                                                 free_cnt);
 989                                 if (unlikely(error)) {
 990                                         for (i = 0; i < free_cnt; i++)
 991                                                 rte_pktmbuf_free(pkts[i]);
 992                                 }
 993                         }
 994
 995                         nbufs += free_cnt;
 996                         vq_update_avail_idx(vq);
 997                 }
 998         } else {
 999                 while (!virtqueue_full(vq)) {
1000                         m = rte_mbuf_raw_alloc(rxvq->mpool);
1001                         if (m == NULL)
1002                                 break;
1003
1004                         /* Enqueue allocated buffers */
1005                         if (vtpci_packed_queue(vq->hw))
1006                                 error = virtqueue_enqueue_recv_refill_packed(vq,
1007                                                 &m, 1);
1008                         else
1009                                 error = virtqueue_enqueue_recv_refill(vq,
1010                                                 &m, 1);
1011                         if (error) {
1012                                 rte_pktmbuf_free(m);
1013                                 break;
1014                         }
1015                         nbufs++;
1016                 }
1017
1018                 if (!vtpci_packed_queue(vq->hw))
1019                         vq_update_avail_idx(vq);
1020         }
1021
1022         PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
1023
1024         VIRTQUEUE_DUMP(vq);
1025
1026         return 0;
1027 }
1028
1029 /*
1030  * struct rte_eth_dev *dev: Used to update dev
1031  * uint16_t nb_desc: Defaults to values read from config space
1032  * unsigned int socket_id: Used to allocate memzone
1033  * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
1034  * uint16_t queue_idx: Just used as an index in dev txq list
1035  */
1036 int
1037 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
1038                         uint16_t queue_idx,
1039                         uint16_t nb_desc,
1040                         unsigned int socket_id __rte_unused,
1041                         const struct rte_eth_txconf *tx_conf)
1042 {
1043         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
1044         struct virtio_hw *hw = dev->data->dev_private;
1045         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
1046         struct virtnet_tx *txvq;
1047         uint16_t tx_free_thresh;
1048
1049         PMD_INIT_FUNC_TRACE();
1050
1051         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
1052                 nb_desc = vq->vq_nentries;
1053         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
1054
1055         txvq = &vq->txq;
1056         txvq->queue_id = queue_idx;
1057
1058         tx_free_thresh = tx_conf->tx_free_thresh;
1059         if (tx_free_thresh == 0)
1060                 tx_free_thresh =
1061                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
1062
1063         if (tx_free_thresh >= (vq->vq_nentries - 3)) {
1064                 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
1065                         "number of TX entries minus 3 (%u)."
1066                         " (tx_free_thresh=%u port=%u queue=%u)\n",
1067                         vq->vq_nentries - 3,
1068                         tx_free_thresh, dev->data->port_id, queue_idx);
1069                 return -EINVAL;
1070         }
1071
1072         vq->vq_free_thresh = tx_free_thresh;
1073
1074         dev->data->tx_queues[queue_idx] = txvq;
1075         return 0;
1076 }
1077
1078 int
1079 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
1080                                 uint16_t queue_idx)
1081 {
1082         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
1083         struct virtio_hw *hw = dev->data->dev_private;
1084         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
1085
1086         PMD_INIT_FUNC_TRACE();
1087
1088         if (!vtpci_packed_queue(hw)) {
1089                 if (hw->use_inorder_tx)
1090                         vq->vq_split.ring.desc[vq->vq_nentries - 1].next = 0;
1091         }
1092
1093         VIRTQUEUE_DUMP(vq);
1094
1095         return 0;
1096 }
1097
1098 static inline void
1099 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
1100 {
1101         int error;
1102         /*
1103          * Requeue the discarded mbuf. This should always be
1104          * successful since it was just dequeued.
1105          */
1106         if (vtpci_packed_queue(vq->hw))
1107                 error = virtqueue_enqueue_recv_refill_packed(vq, &m, 1);
1108         else
1109                 error = virtqueue_enqueue_recv_refill(vq, &m, 1);
1110
1111         if (unlikely(error)) {
1112                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
1113                 rte_pktmbuf_free(m);
1114         }
1115 }
1116
1117 static inline void
1118 virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
1119 {
1120         int error;
1121
1122         error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
1123         if (unlikely(error)) {
1124                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
1125                 rte_pktmbuf_free(m);
1126         }
1127 }
1128
1129 /* Optionally fill offload information in structure */
1130 static inline int
1131 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
1132 {
1133         struct rte_net_hdr_lens hdr_lens;
1134         uint32_t hdrlen, ptype;
1135         int l4_supported = 0;
1136
1137         /* nothing to do */
1138         if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
1139                 return 0;
1140
1141         m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
1142
1143         ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
1144         m->packet_type = ptype;
1145         if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
1146             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
1147             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
1148                 l4_supported = 1;
1149
1150         if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1151                 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
1152                 if (hdr->csum_start <= hdrlen && l4_supported) {
1153                         m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
1154                 } else {
1155                         /* Unknown proto or tunnel, do sw cksum. We can assume
1156                          * the cksum field is in the first segment since the
1157                          * buffers we provided to the host are large enough.
1158                          * In case of SCTP, this will be wrong since it's a CRC
1159                          * but there's nothing we can do.
1160                          */
1161                         uint16_t csum = 0, off;
1162
1163                         rte_raw_cksum_mbuf(m, hdr->csum_start,
1164                                 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
1165                                 &csum);
1166                         if (likely(csum != 0xffff))
1167                                 csum = ~csum;
1168                         off = hdr->csum_offset + hdr->csum_start;
1169                         if (rte_pktmbuf_data_len(m) >= off + 1)
1170                                 *rte_pktmbuf_mtod_offset(m, uint16_t *,
1171                                         off) = csum;
1172                 }
1173         } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
1174                 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
1175         }
1176
1177         /* GSO request, save required information in mbuf */
1178         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1179                 /* Check unsupported modes */
1180                 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
1181                     (hdr->gso_size == 0)) {
1182                         return -EINVAL;
1183                 }
1184
1185                 /* Update mss lengthes in mbuf */
1186                 m->tso_segsz = hdr->gso_size;
1187                 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1188                         case VIRTIO_NET_HDR_GSO_TCPV4:
1189                         case VIRTIO_NET_HDR_GSO_TCPV6:
1190                                 m->ol_flags |= PKT_RX_LRO | \
1191                                         PKT_RX_L4_CKSUM_NONE;
1192                                 break;
1193                         default:
1194                                 return -EINVAL;
1195                 }
1196         }
1197
1198         return 0;
1199 }
1200
1201 #define VIRTIO_MBUF_BURST_SZ 64
1202 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
1203 uint16_t
1204 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
1205 {
1206         struct virtnet_rx *rxvq = rx_queue;
1207         struct virtqueue *vq = rxvq->vq;
1208         struct virtio_hw *hw = vq->hw;
1209         struct rte_mbuf *rxm;
1210         uint16_t nb_used, num, nb_rx;
1211         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1212         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1213         int error;
1214         uint32_t i, nb_enqueued;
1215         uint32_t hdr_size;
1216         struct virtio_net_hdr *hdr;
1217
1218         nb_rx = 0;
1219         if (unlikely(hw->started == 0))
1220                 return nb_rx;
1221
1222         nb_used = VIRTQUEUE_NUSED(vq);
1223
1224         virtio_rmb(hw->weak_barriers);
1225
1226         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1227         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1228                 num = VIRTIO_MBUF_BURST_SZ;
1229         if (likely(num > DESC_PER_CACHELINE))
1230                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1231
1232         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1233         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
1234
1235         nb_enqueued = 0;
1236         hdr_size = hw->vtnet_hdr_size;
1237
1238         for (i = 0; i < num ; i++) {
1239                 rxm = rcv_pkts[i];
1240
1241                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1242
1243                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1244                         PMD_RX_LOG(ERR, "Packet drop");
1245                         nb_enqueued++;
1246                         virtio_discard_rxbuf(vq, rxm);
1247                         rxvq->stats.errors++;
1248                         continue;
1249                 }
1250
1251                 rxm->port = rxvq->port_id;
1252                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1253                 rxm->ol_flags = 0;
1254                 rxm->vlan_tci = 0;
1255
1256                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1257                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1258
1259                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1260                         RTE_PKTMBUF_HEADROOM - hdr_size);
1261
1262                 if (hw->vlan_strip)
1263                         rte_vlan_strip(rxm);
1264
1265                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1266                         virtio_discard_rxbuf(vq, rxm);
1267                         rxvq->stats.errors++;
1268                         continue;
1269                 }
1270
1271                 virtio_rx_stats_updated(rxvq, rxm);
1272
1273                 rx_pkts[nb_rx++] = rxm;
1274         }
1275
1276         rxvq->stats.packets += nb_rx;
1277
1278         /* Allocate new mbuf for the used descriptor */
1279         if (likely(!virtqueue_full(vq))) {
1280                 uint16_t free_cnt = vq->vq_free_cnt;
1281                 struct rte_mbuf *new_pkts[free_cnt];
1282
1283                 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1284                                                 free_cnt) == 0)) {
1285                         error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1286                                         free_cnt);
1287                         if (unlikely(error)) {
1288                                 for (i = 0; i < free_cnt; i++)
1289                                         rte_pktmbuf_free(new_pkts[i]);
1290                         }
1291                         nb_enqueued += free_cnt;
1292                 } else {
1293                         struct rte_eth_dev *dev =
1294                                 &rte_eth_devices[rxvq->port_id];
1295                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1296                 }
1297         }
1298
1299         if (likely(nb_enqueued)) {
1300                 vq_update_avail_idx(vq);
1301
1302                 if (unlikely(virtqueue_kick_prepare(vq))) {
1303                         virtqueue_notify(vq);
1304                         PMD_RX_LOG(DEBUG, "Notified");
1305                 }
1306         }
1307
1308         return nb_rx;
1309 }
1310
1311 uint16_t
1312 virtio_recv_pkts_packed(void *rx_queue, struct rte_mbuf **rx_pkts,
1313                         uint16_t nb_pkts)
1314 {
1315         struct virtnet_rx *rxvq = rx_queue;
1316         struct virtqueue *vq = rxvq->vq;
1317         struct virtio_hw *hw = vq->hw;
1318         struct rte_mbuf *rxm;
1319         uint16_t num, nb_rx;
1320         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1321         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1322         int error;
1323         uint32_t i, nb_enqueued;
1324         uint32_t hdr_size;
1325         struct virtio_net_hdr *hdr;
1326
1327         nb_rx = 0;
1328         if (unlikely(hw->started == 0))
1329                 return nb_rx;
1330
1331         num = RTE_MIN(VIRTIO_MBUF_BURST_SZ, nb_pkts);
1332         if (likely(num > DESC_PER_CACHELINE))
1333                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1334
1335         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1336         PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1337
1338         nb_enqueued = 0;
1339         hdr_size = hw->vtnet_hdr_size;
1340
1341         for (i = 0; i < num; i++) {
1342                 rxm = rcv_pkts[i];
1343
1344                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1345
1346                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1347                         PMD_RX_LOG(ERR, "Packet drop");
1348                         nb_enqueued++;
1349                         virtio_discard_rxbuf(vq, rxm);
1350                         rxvq->stats.errors++;
1351                         continue;
1352                 }
1353
1354                 rxm->port = rxvq->port_id;
1355                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1356                 rxm->ol_flags = 0;
1357                 rxm->vlan_tci = 0;
1358
1359                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1360                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1361
1362                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1363                         RTE_PKTMBUF_HEADROOM - hdr_size);
1364
1365                 if (hw->vlan_strip)
1366                         rte_vlan_strip(rxm);
1367
1368                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1369                         virtio_discard_rxbuf(vq, rxm);
1370                         rxvq->stats.errors++;
1371                         continue;
1372                 }
1373
1374                 virtio_rx_stats_updated(rxvq, rxm);
1375
1376                 rx_pkts[nb_rx++] = rxm;
1377         }
1378
1379         rxvq->stats.packets += nb_rx;
1380
1381         /* Allocate new mbuf for the used descriptor */
1382         if (likely(!virtqueue_full(vq))) {
1383                 uint16_t free_cnt = vq->vq_free_cnt;
1384                 struct rte_mbuf *new_pkts[free_cnt];
1385
1386                 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1387                                                 free_cnt) == 0)) {
1388                         error = virtqueue_enqueue_recv_refill_packed(vq,
1389                                         new_pkts, free_cnt);
1390                         if (unlikely(error)) {
1391                                 for (i = 0; i < free_cnt; i++)
1392                                         rte_pktmbuf_free(new_pkts[i]);
1393                         }
1394                         nb_enqueued += free_cnt;
1395                 } else {
1396                         struct rte_eth_dev *dev =
1397                                 &rte_eth_devices[rxvq->port_id];
1398                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1399                 }
1400         }
1401
1402         if (likely(nb_enqueued)) {
1403                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1404                         virtqueue_notify(vq);
1405                         PMD_RX_LOG(DEBUG, "Notified");
1406                 }
1407         }
1408
1409         return nb_rx;
1410 }
1411
1412
1413 uint16_t
1414 virtio_recv_pkts_inorder(void *rx_queue,
1415                         struct rte_mbuf **rx_pkts,
1416                         uint16_t nb_pkts)
1417 {
1418         struct virtnet_rx *rxvq = rx_queue;
1419         struct virtqueue *vq = rxvq->vq;
1420         struct virtio_hw *hw = vq->hw;
1421         struct rte_mbuf *rxm;
1422         struct rte_mbuf *prev = NULL;
1423         uint16_t nb_used, num, nb_rx;
1424         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1425         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1426         int error;
1427         uint32_t nb_enqueued;
1428         uint32_t seg_num;
1429         uint32_t seg_res;
1430         uint32_t hdr_size;
1431         int32_t i;
1432
1433         nb_rx = 0;
1434         if (unlikely(hw->started == 0))
1435                 return nb_rx;
1436
1437         nb_used = VIRTQUEUE_NUSED(vq);
1438         nb_used = RTE_MIN(nb_used, nb_pkts);
1439         nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ);
1440
1441         virtio_rmb(hw->weak_barriers);
1442
1443         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1444
1445         nb_enqueued = 0;
1446         seg_num = 1;
1447         seg_res = 0;
1448         hdr_size = hw->vtnet_hdr_size;
1449
1450         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
1451
1452         for (i = 0; i < num; i++) {
1453                 struct virtio_net_hdr_mrg_rxbuf *header;
1454
1455                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1456                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1457
1458                 rxm = rcv_pkts[i];
1459
1460                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1461                         PMD_RX_LOG(ERR, "Packet drop");
1462                         nb_enqueued++;
1463                         virtio_discard_rxbuf_inorder(vq, rxm);
1464                         rxvq->stats.errors++;
1465                         continue;
1466                 }
1467
1468                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1469                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1470                          - hdr_size);
1471
1472                 if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
1473                         seg_num = header->num_buffers;
1474                         if (seg_num == 0)
1475                                 seg_num = 1;
1476                 } else {
1477                         seg_num = 1;
1478                 }
1479
1480                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1481                 rxm->nb_segs = seg_num;
1482                 rxm->ol_flags = 0;
1483                 rxm->vlan_tci = 0;
1484                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1485                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1486
1487                 rxm->port = rxvq->port_id;
1488
1489                 rx_pkts[nb_rx] = rxm;
1490                 prev = rxm;
1491
1492                 if (vq->hw->has_rx_offload &&
1493                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1494                         virtio_discard_rxbuf_inorder(vq, rxm);
1495                         rxvq->stats.errors++;
1496                         continue;
1497                 }
1498
1499                 if (hw->vlan_strip)
1500                         rte_vlan_strip(rx_pkts[nb_rx]);
1501
1502                 seg_res = seg_num - 1;
1503
1504                 /* Merge remaining segments */
1505                 while (seg_res != 0 && i < (num - 1)) {
1506                         i++;
1507
1508                         rxm = rcv_pkts[i];
1509                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1510                         rxm->pkt_len = (uint32_t)(len[i]);
1511                         rxm->data_len = (uint16_t)(len[i]);
1512
1513                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1514
1515                         prev->next = rxm;
1516                         prev = rxm;
1517                         seg_res -= 1;
1518                 }
1519
1520                 if (!seg_res) {
1521                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1522                         nb_rx++;
1523                 }
1524         }
1525
1526         /* Last packet still need merge segments */
1527         while (seg_res != 0) {
1528                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1529                                         VIRTIO_MBUF_BURST_SZ);
1530
1531                 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1532                         virtio_rmb(hw->weak_barriers);
1533                         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
1534                                                            rcv_cnt);
1535                         uint16_t extra_idx = 0;
1536
1537                         rcv_cnt = num;
1538                         while (extra_idx < rcv_cnt) {
1539                                 rxm = rcv_pkts[extra_idx];
1540                                 rxm->data_off =
1541                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1542                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1543                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1544                                 prev->next = rxm;
1545                                 prev = rxm;
1546                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1547                                 extra_idx += 1;
1548                         };
1549                         seg_res -= rcv_cnt;
1550
1551                         if (!seg_res) {
1552                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1553                                 nb_rx++;
1554                         }
1555                 } else {
1556                         PMD_RX_LOG(ERR,
1557                                         "No enough segments for packet.");
1558                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1559                         rxvq->stats.errors++;
1560                         break;
1561                 }
1562         }
1563
1564         rxvq->stats.packets += nb_rx;
1565
1566         /* Allocate new mbuf for the used descriptor */
1567
1568         if (likely(!virtqueue_full(vq))) {
1569                 /* free_cnt may include mrg descs */
1570                 uint16_t free_cnt = vq->vq_free_cnt;
1571                 struct rte_mbuf *new_pkts[free_cnt];
1572
1573                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1574                         error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
1575                                         free_cnt);
1576                         if (unlikely(error)) {
1577                                 for (i = 0; i < free_cnt; i++)
1578                                         rte_pktmbuf_free(new_pkts[i]);
1579                         }
1580                         nb_enqueued += free_cnt;
1581                 } else {
1582                         struct rte_eth_dev *dev =
1583                                 &rte_eth_devices[rxvq->port_id];
1584                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1585                 }
1586         }
1587
1588         if (likely(nb_enqueued)) {
1589                 vq_update_avail_idx(vq);
1590
1591                 if (unlikely(virtqueue_kick_prepare(vq))) {
1592                         virtqueue_notify(vq);
1593                         PMD_RX_LOG(DEBUG, "Notified");
1594                 }
1595         }
1596
1597         return nb_rx;
1598 }
1599
1600 uint16_t
1601 virtio_recv_mergeable_pkts(void *rx_queue,
1602                         struct rte_mbuf **rx_pkts,
1603                         uint16_t nb_pkts)
1604 {
1605         struct virtnet_rx *rxvq = rx_queue;
1606         struct virtqueue *vq = rxvq->vq;
1607         struct virtio_hw *hw = vq->hw;
1608         struct rte_mbuf *rxm;
1609         struct rte_mbuf *prev = NULL;
1610         uint16_t nb_used, num, nb_rx = 0;
1611         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1612         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1613         int error;
1614         uint32_t nb_enqueued = 0;
1615         uint32_t seg_num = 0;
1616         uint32_t seg_res = 0;
1617         uint32_t hdr_size = hw->vtnet_hdr_size;
1618         int32_t i;
1619
1620         if (unlikely(hw->started == 0))
1621                 return nb_rx;
1622
1623         nb_used = VIRTQUEUE_NUSED(vq);
1624
1625         virtio_rmb(hw->weak_barriers);
1626
1627         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1628
1629         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1630         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1631                 num = VIRTIO_MBUF_BURST_SZ;
1632         if (likely(num > DESC_PER_CACHELINE))
1633                 num = num - ((vq->vq_used_cons_idx + num) %
1634                                 DESC_PER_CACHELINE);
1635
1636
1637         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1638
1639         for (i = 0; i < num; i++) {
1640                 struct virtio_net_hdr_mrg_rxbuf *header;
1641
1642                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1643                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1644
1645                 rxm = rcv_pkts[i];
1646
1647                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1648                         PMD_RX_LOG(ERR, "Packet drop");
1649                         nb_enqueued++;
1650                         virtio_discard_rxbuf(vq, rxm);
1651                         rxvq->stats.errors++;
1652                         continue;
1653                 }
1654
1655                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1656                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1657                          - hdr_size);
1658                 seg_num = header->num_buffers;
1659                 if (seg_num == 0)
1660                         seg_num = 1;
1661
1662                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1663                 rxm->nb_segs = seg_num;
1664                 rxm->ol_flags = 0;
1665                 rxm->vlan_tci = 0;
1666                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1667                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1668
1669                 rxm->port = rxvq->port_id;
1670
1671                 rx_pkts[nb_rx] = rxm;
1672                 prev = rxm;
1673
1674                 if (hw->has_rx_offload &&
1675                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1676                         virtio_discard_rxbuf(vq, rxm);
1677                         rxvq->stats.errors++;
1678                         continue;
1679                 }
1680
1681                 if (hw->vlan_strip)
1682                         rte_vlan_strip(rx_pkts[nb_rx]);
1683
1684                 seg_res = seg_num - 1;
1685
1686                 /* Merge remaining segments */
1687                 while (seg_res != 0 && i < (num - 1)) {
1688                         i++;
1689
1690                         rxm = rcv_pkts[i];
1691                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1692                         rxm->pkt_len = (uint32_t)(len[i]);
1693                         rxm->data_len = (uint16_t)(len[i]);
1694
1695                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1696
1697                         prev->next = rxm;
1698                         prev = rxm;
1699                         seg_res -= 1;
1700                 }
1701
1702                 if (!seg_res) {
1703                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1704                         nb_rx++;
1705                 }
1706         }
1707
1708         /* Last packet still need merge segments */
1709         while (seg_res != 0) {
1710                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1711                                         VIRTIO_MBUF_BURST_SZ);
1712
1713                 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1714                         virtio_rmb(hw->weak_barriers);
1715                         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len,
1716                                                            rcv_cnt);
1717                         uint16_t extra_idx = 0;
1718
1719                         rcv_cnt = num;
1720                         while (extra_idx < rcv_cnt) {
1721                                 rxm = rcv_pkts[extra_idx];
1722                                 rxm->data_off =
1723                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1724                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1725                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1726                                 prev->next = rxm;
1727                                 prev = rxm;
1728                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1729                                 extra_idx += 1;
1730                         };
1731                         seg_res -= rcv_cnt;
1732
1733                         if (!seg_res) {
1734                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1735                                 nb_rx++;
1736                         }
1737                 } else {
1738                         PMD_RX_LOG(ERR,
1739                                         "No enough segments for packet.");
1740                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1741                         rxvq->stats.errors++;
1742                         break;
1743                 }
1744         }
1745
1746         rxvq->stats.packets += nb_rx;
1747
1748         /* Allocate new mbuf for the used descriptor */
1749         if (likely(!virtqueue_full(vq))) {
1750                 /* free_cnt may include mrg descs */
1751                 uint16_t free_cnt = vq->vq_free_cnt;
1752                 struct rte_mbuf *new_pkts[free_cnt];
1753
1754                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1755                         error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1756                                         free_cnt);
1757                         if (unlikely(error)) {
1758                                 for (i = 0; i < free_cnt; i++)
1759                                         rte_pktmbuf_free(new_pkts[i]);
1760                         }
1761                         nb_enqueued += free_cnt;
1762                 } else {
1763                         struct rte_eth_dev *dev =
1764                                 &rte_eth_devices[rxvq->port_id];
1765                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1766                 }
1767         }
1768
1769         if (likely(nb_enqueued)) {
1770                 vq_update_avail_idx(vq);
1771
1772                 if (unlikely(virtqueue_kick_prepare(vq))) {
1773                         virtqueue_notify(vq);
1774                         PMD_RX_LOG(DEBUG, "Notified");
1775                 }
1776         }
1777
1778         return nb_rx;
1779 }
1780
1781 uint16_t
1782 virtio_recv_mergeable_pkts_packed(void *rx_queue,
1783                         struct rte_mbuf **rx_pkts,
1784                         uint16_t nb_pkts)
1785 {
1786         struct virtnet_rx *rxvq = rx_queue;
1787         struct virtqueue *vq = rxvq->vq;
1788         struct virtio_hw *hw = vq->hw;
1789         struct rte_mbuf *rxm;
1790         struct rte_mbuf *prev = NULL;
1791         uint16_t num, nb_rx = 0;
1792         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1793         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1794         uint32_t nb_enqueued = 0;
1795         uint32_t seg_num = 0;
1796         uint32_t seg_res = 0;
1797         uint32_t hdr_size = hw->vtnet_hdr_size;
1798         int32_t i;
1799         int error;
1800
1801         if (unlikely(hw->started == 0))
1802                 return nb_rx;
1803
1804
1805         num = nb_pkts;
1806         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1807                 num = VIRTIO_MBUF_BURST_SZ;
1808         if (likely(num > DESC_PER_CACHELINE))
1809                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1810
1811         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1812
1813         for (i = 0; i < num; i++) {
1814                 struct virtio_net_hdr_mrg_rxbuf *header;
1815
1816                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1817                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1818
1819                 rxm = rcv_pkts[i];
1820
1821                 if (unlikely(len[i] < hdr_size + RTE_ETHER_HDR_LEN)) {
1822                         PMD_RX_LOG(ERR, "Packet drop");
1823                         nb_enqueued++;
1824                         virtio_discard_rxbuf(vq, rxm);
1825                         rxvq->stats.errors++;
1826                         continue;
1827                 }
1828
1829                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)
1830                           rxm->buf_addr + RTE_PKTMBUF_HEADROOM - hdr_size);
1831                 seg_num = header->num_buffers;
1832
1833                 if (seg_num == 0)
1834                         seg_num = 1;
1835
1836                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1837                 rxm->nb_segs = seg_num;
1838                 rxm->ol_flags = 0;
1839                 rxm->vlan_tci = 0;
1840                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1841                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1842
1843                 rxm->port = rxvq->port_id;
1844                 rx_pkts[nb_rx] = rxm;
1845                 prev = rxm;
1846
1847                 if (hw->has_rx_offload &&
1848                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1849                         virtio_discard_rxbuf(vq, rxm);
1850                         rxvq->stats.errors++;
1851                         continue;
1852                 }
1853
1854                 if (hw->vlan_strip)
1855                         rte_vlan_strip(rx_pkts[nb_rx]);
1856
1857                 seg_res = seg_num - 1;
1858
1859                 /* Merge remaining segments */
1860                 while (seg_res != 0 && i < (num - 1)) {
1861                         i++;
1862
1863                         rxm = rcv_pkts[i];
1864                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1865                         rxm->pkt_len = (uint32_t)(len[i]);
1866                         rxm->data_len = (uint16_t)(len[i]);
1867
1868                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1869
1870                         prev->next = rxm;
1871                         prev = rxm;
1872                         seg_res -= 1;
1873                 }
1874
1875                 if (!seg_res) {
1876                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1877                         nb_rx++;
1878                 }
1879         }
1880
1881         /* Last packet still need merge segments */
1882         while (seg_res != 0) {
1883                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1884                                         VIRTIO_MBUF_BURST_SZ);
1885                 uint16_t extra_idx = 0;
1886
1887                 rcv_cnt = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts,
1888                                 len, rcv_cnt);
1889                 if (unlikely(rcv_cnt == 0)) {
1890                         PMD_RX_LOG(ERR, "No enough segments for packet.");
1891                         rte_pktmbuf_free(rx_pkts[nb_rx]);
1892                         rxvq->stats.errors++;
1893                         break;
1894                 }
1895
1896                 while (extra_idx < rcv_cnt) {
1897                         rxm = rcv_pkts[extra_idx];
1898
1899                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1900                         rxm->pkt_len = (uint32_t)(len[extra_idx]);
1901                         rxm->data_len = (uint16_t)(len[extra_idx]);
1902
1903                         prev->next = rxm;
1904                         prev = rxm;
1905                         rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1906                         extra_idx += 1;
1907                 }
1908                 seg_res -= rcv_cnt;
1909                 if (!seg_res) {
1910                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1911                         nb_rx++;
1912                 }
1913         }
1914
1915         rxvq->stats.packets += nb_rx;
1916
1917         /* Allocate new mbuf for the used descriptor */
1918         if (likely(!virtqueue_full(vq))) {
1919                 /* free_cnt may include mrg descs */
1920                 uint16_t free_cnt = vq->vq_free_cnt;
1921                 struct rte_mbuf *new_pkts[free_cnt];
1922
1923                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1924                         error = virtqueue_enqueue_recv_refill_packed(vq,
1925                                         new_pkts, free_cnt);
1926                         if (unlikely(error)) {
1927                                 for (i = 0; i < free_cnt; i++)
1928                                         rte_pktmbuf_free(new_pkts[i]);
1929                         }
1930                         nb_enqueued += free_cnt;
1931                 } else {
1932                         struct rte_eth_dev *dev =
1933                                 &rte_eth_devices[rxvq->port_id];
1934                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1935                 }
1936         }
1937
1938         if (likely(nb_enqueued)) {
1939                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1940                         virtqueue_notify(vq);
1941                         PMD_RX_LOG(DEBUG, "Notified");
1942                 }
1943         }
1944
1945         return nb_rx;
1946 }
1947
1948 uint16_t
1949 virtio_xmit_pkts_prepare(void *tx_queue __rte_unused, struct rte_mbuf **tx_pkts,
1950                         uint16_t nb_pkts)
1951 {
1952         uint16_t nb_tx;
1953         int error;
1954
1955         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1956                 struct rte_mbuf *m = tx_pkts[nb_tx];
1957
1958 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
1959                 error = rte_validate_tx_offload(m);
1960                 if (unlikely(error)) {
1961                         rte_errno = -error;
1962                         break;
1963                 }
1964 #endif
1965
1966                 /* Do VLAN tag insertion */
1967                 if (unlikely(m->ol_flags & PKT_TX_VLAN_PKT)) {
1968                         error = rte_vlan_insert(&m);
1969                         /* rte_vlan_insert() may change pointer
1970                          * even in the case of failure
1971                          */
1972                         tx_pkts[nb_tx] = m;
1973
1974                         if (unlikely(error)) {
1975                                 rte_errno = -error;
1976                                 break;
1977                         }
1978                 }
1979
1980                 error = rte_net_intel_cksum_prepare(m);
1981                 if (unlikely(error)) {
1982                         rte_errno = -error;
1983                         break;
1984                 }
1985
1986                 if (m->ol_flags & PKT_TX_TCP_SEG)
1987                         virtio_tso_fix_cksum(m);
1988         }
1989
1990         return nb_tx;
1991 }
1992
1993 uint16_t
1994 virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts,
1995                         uint16_t nb_pkts)
1996 {
1997         struct virtnet_tx *txvq = tx_queue;
1998         struct virtqueue *vq = txvq->vq;
1999         struct virtio_hw *hw = vq->hw;
2000         uint16_t hdr_size = hw->vtnet_hdr_size;
2001         uint16_t nb_tx = 0;
2002         bool in_order = hw->use_inorder_tx;
2003
2004         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2005                 return nb_tx;
2006
2007         if (unlikely(nb_pkts < 1))
2008                 return nb_pkts;
2009
2010         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2011
2012         if (nb_pkts > vq->vq_free_cnt)
2013                 virtio_xmit_cleanup_packed(vq, nb_pkts - vq->vq_free_cnt,
2014                                            in_order);
2015
2016         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
2017                 struct rte_mbuf *txm = tx_pkts[nb_tx];
2018                 int can_push = 0, slots, need;
2019
2020                 /* optimize ring usage */
2021                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2022                       vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2023                     rte_mbuf_refcnt_read(txm) == 1 &&
2024                     RTE_MBUF_DIRECT(txm) &&
2025                     txm->nb_segs == 1 &&
2026                     rte_pktmbuf_headroom(txm) >= hdr_size &&
2027                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2028                            __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
2029                         can_push = 1;
2030
2031                 /* How many main ring entries are needed to this Tx?
2032                  * any_layout => number of segments
2033                  * default    => number of segments + 1
2034                  */
2035                 slots = txm->nb_segs + !can_push;
2036                 need = slots - vq->vq_free_cnt;
2037
2038                 /* Positive value indicates it need free vring descriptors */
2039                 if (unlikely(need > 0)) {
2040                         virtio_xmit_cleanup_packed(vq, need, in_order);
2041                         need = slots - vq->vq_free_cnt;
2042                         if (unlikely(need > 0)) {
2043                                 PMD_TX_LOG(ERR,
2044                                            "No free tx descriptors to transmit");
2045                                 break;
2046                         }
2047                 }
2048
2049                 /* Enqueue Packet buffers */
2050                 if (can_push)
2051                         virtqueue_enqueue_xmit_packed_fast(txvq, txm, in_order);
2052                 else
2053                         virtqueue_enqueue_xmit_packed(txvq, txm, slots, 0,
2054                                                       in_order);
2055
2056                 virtio_update_packet_stats(&txvq->stats, txm);
2057         }
2058
2059         txvq->stats.packets += nb_tx;
2060
2061         if (likely(nb_tx)) {
2062                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
2063                         virtqueue_notify(vq);
2064                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2065                 }
2066         }
2067
2068         return nb_tx;
2069 }
2070
2071 uint16_t
2072 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
2073 {
2074         struct virtnet_tx *txvq = tx_queue;
2075         struct virtqueue *vq = txvq->vq;
2076         struct virtio_hw *hw = vq->hw;
2077         uint16_t hdr_size = hw->vtnet_hdr_size;
2078         uint16_t nb_used, nb_tx = 0;
2079
2080         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2081                 return nb_tx;
2082
2083         if (unlikely(nb_pkts < 1))
2084                 return nb_pkts;
2085
2086         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2087         nb_used = VIRTQUEUE_NUSED(vq);
2088
2089         virtio_rmb(hw->weak_barriers);
2090         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
2091                 virtio_xmit_cleanup(vq, nb_used);
2092
2093         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
2094                 struct rte_mbuf *txm = tx_pkts[nb_tx];
2095                 int can_push = 0, use_indirect = 0, slots, need;
2096
2097                 /* optimize ring usage */
2098                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2099                       vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2100                     rte_mbuf_refcnt_read(txm) == 1 &&
2101                     RTE_MBUF_DIRECT(txm) &&
2102                     txm->nb_segs == 1 &&
2103                     rte_pktmbuf_headroom(txm) >= hdr_size &&
2104                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2105                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
2106                         can_push = 1;
2107                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
2108                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
2109                         use_indirect = 1;
2110
2111                 /* How many main ring entries are needed to this Tx?
2112                  * any_layout => number of segments
2113                  * indirect   => 1
2114                  * default    => number of segments + 1
2115                  */
2116                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
2117                 need = slots - vq->vq_free_cnt;
2118
2119                 /* Positive value indicates it need free vring descriptors */
2120                 if (unlikely(need > 0)) {
2121                         nb_used = VIRTQUEUE_NUSED(vq);
2122                         virtio_rmb(hw->weak_barriers);
2123                         need = RTE_MIN(need, (int)nb_used);
2124
2125                         virtio_xmit_cleanup(vq, need);
2126                         need = slots - vq->vq_free_cnt;
2127                         if (unlikely(need > 0)) {
2128                                 PMD_TX_LOG(ERR,
2129                                            "No free tx descriptors to transmit");
2130                                 break;
2131                         }
2132                 }
2133
2134                 /* Enqueue Packet buffers */
2135                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
2136                         can_push, 0);
2137
2138                 virtio_update_packet_stats(&txvq->stats, txm);
2139         }
2140
2141         txvq->stats.packets += nb_tx;
2142
2143         if (likely(nb_tx)) {
2144                 vq_update_avail_idx(vq);
2145
2146                 if (unlikely(virtqueue_kick_prepare(vq))) {
2147                         virtqueue_notify(vq);
2148                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2149                 }
2150         }
2151
2152         return nb_tx;
2153 }
2154
2155 uint16_t
2156 virtio_xmit_pkts_inorder(void *tx_queue,
2157                         struct rte_mbuf **tx_pkts,
2158                         uint16_t nb_pkts)
2159 {
2160         struct virtnet_tx *txvq = tx_queue;
2161         struct virtqueue *vq = txvq->vq;
2162         struct virtio_hw *hw = vq->hw;
2163         uint16_t hdr_size = hw->vtnet_hdr_size;
2164         uint16_t nb_used, nb_avail, nb_tx = 0, nb_inorder_pkts = 0;
2165         struct rte_mbuf *inorder_pkts[nb_pkts];
2166
2167         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2168                 return nb_tx;
2169
2170         if (unlikely(nb_pkts < 1))
2171                 return nb_pkts;
2172
2173         VIRTQUEUE_DUMP(vq);
2174         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2175         nb_used = VIRTQUEUE_NUSED(vq);
2176
2177         virtio_rmb(hw->weak_barriers);
2178         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
2179                 virtio_xmit_cleanup_inorder(vq, nb_used);
2180
2181         if (unlikely(!vq->vq_free_cnt))
2182                 virtio_xmit_cleanup_inorder(vq, nb_used);
2183
2184         nb_avail = RTE_MIN(vq->vq_free_cnt, nb_pkts);
2185
2186         for (nb_tx = 0; nb_tx < nb_avail; nb_tx++) {
2187                 struct rte_mbuf *txm = tx_pkts[nb_tx];
2188                 int slots, need;
2189
2190                 /* optimize ring usage */
2191                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2192                      vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2193                      rte_mbuf_refcnt_read(txm) == 1 &&
2194                      RTE_MBUF_DIRECT(txm) &&
2195                      txm->nb_segs == 1 &&
2196                      rte_pktmbuf_headroom(txm) >= hdr_size &&
2197                      rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2198                                 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
2199                         inorder_pkts[nb_inorder_pkts] = txm;
2200                         nb_inorder_pkts++;
2201
2202                         continue;
2203                 }
2204
2205                 if (nb_inorder_pkts) {
2206                         virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2207                                                         nb_inorder_pkts);
2208                         nb_inorder_pkts = 0;
2209                 }
2210
2211                 slots = txm->nb_segs + 1;
2212                 need = slots - vq->vq_free_cnt;
2213                 if (unlikely(need > 0)) {
2214                         nb_used = VIRTQUEUE_NUSED(vq);
2215                         virtio_rmb(hw->weak_barriers);
2216                         need = RTE_MIN(need, (int)nb_used);
2217
2218                         virtio_xmit_cleanup_inorder(vq, need);
2219
2220                         need = slots - vq->vq_free_cnt;
2221
2222                         if (unlikely(need > 0)) {
2223                                 PMD_TX_LOG(ERR,
2224                                         "No free tx descriptors to transmit");
2225                                 break;
2226                         }
2227                 }
2228                 /* Enqueue Packet buffers */
2229                 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
2230
2231                 virtio_update_packet_stats(&txvq->stats, txm);
2232         }
2233
2234         /* Transmit all inorder packets */
2235         if (nb_inorder_pkts)
2236                 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2237                                                 nb_inorder_pkts);
2238
2239         txvq->stats.packets += nb_tx;
2240
2241         if (likely(nb_tx)) {
2242                 vq_update_avail_idx(vq);
2243
2244                 if (unlikely(virtqueue_kick_prepare(vq))) {
2245                         virtqueue_notify(vq);
2246                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2247                 }
2248         }
2249
2250         VIRTQUEUE_DUMP(vq);
2251
2252         return nb_tx;
2253 }