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 uint16_t
 110 virtqueue_dequeue_burst_rx_packed(struct virtqueue *vq,
 111                                   struct rte_mbuf **rx_pkts,
 112                                   uint32_t *len,
 113                                   uint16_t num)
 114 {
 115         struct rte_mbuf *cookie;
 116         uint16_t used_idx;
 117         uint16_t id;
 118         struct vring_packed_desc *desc;
 119         uint16_t i;
 120
 121         desc = vq->vq_packed.ring.desc;
 122
 123         for (i = 0; i < num; i++) {
 124                 used_idx = vq->vq_used_cons_idx;
 125                 if (!desc_is_used(&desc[used_idx], vq))
 126                         return i;
 127                 virtio_rmb(vq->hw->weak_barriers);
 128                 len[i] = desc[used_idx].len;
 129                 id = desc[used_idx].id;
 130                 cookie = (struct rte_mbuf *)vq->vq_descx[id].cookie;
 131                 if (unlikely(cookie == NULL)) {
 132                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 133                                 vq->vq_used_cons_idx);
 134                         break;
 135                 }
 136                 rte_prefetch0(cookie);
 137                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 138                 rx_pkts[i] = cookie;
 139
 140                 vq->vq_free_cnt++;
 141                 vq->vq_used_cons_idx++;
 142                 if (vq->vq_used_cons_idx >= vq->vq_nentries) {
 143                         vq->vq_used_cons_idx -= vq->vq_nentries;
 144                         vq->vq_packed.used_wrap_counter ^= 1;
 145                 }
 146         }
 147
 148         return i;
 149 }
 150
 151 static uint16_t
 152 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
 153                            uint32_t *len, uint16_t num)
 154 {
 155         struct vring_used_elem *uep;
 156         struct rte_mbuf *cookie;
 157         uint16_t used_idx, desc_idx;
 158         uint16_t i;
 159
 160         /*  Caller does the check */
 161         for (i = 0; i < num ; i++) {
 162                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
 163                 uep = &vq->vq_split.ring.used->ring[used_idx];
 164                 desc_idx = (uint16_t) uep->id;
 165                 len[i] = uep->len;
 166                 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
 167
 168                 if (unlikely(cookie == NULL)) {
 169                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 170                                 vq->vq_used_cons_idx);
 171                         break;
 172                 }
 173
 174                 rte_prefetch0(cookie);
 175                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 176                 rx_pkts[i]  = cookie;
 177                 vq->vq_used_cons_idx++;
 178                 vq_ring_free_chain(vq, desc_idx);
 179                 vq->vq_descx[desc_idx].cookie = NULL;
 180         }
 181
 182         return i;
 183 }
 184
 185 static uint16_t
 186 virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
 187                         struct rte_mbuf **rx_pkts,
 188                         uint32_t *len,
 189                         uint16_t num)
 190 {
 191         struct vring_used_elem *uep;
 192         struct rte_mbuf *cookie;
 193         uint16_t used_idx = 0;
 194         uint16_t i;
 195
 196         if (unlikely(num == 0))
 197                 return 0;
 198
 199         for (i = 0; i < num; i++) {
 200                 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
 201                 /* Desc idx same as used idx */
 202                 uep = &vq->vq_split.ring.used->ring[used_idx];
 203                 len[i] = uep->len;
 204                 cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
 205
 206                 if (unlikely(cookie == NULL)) {
 207                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 208                                 vq->vq_used_cons_idx);
 209                         break;
 210                 }
 211
 212                 rte_prefetch0(cookie);
 213                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 214                 rx_pkts[i]  = cookie;
 215                 vq->vq_used_cons_idx++;
 216                 vq->vq_descx[used_idx].cookie = NULL;
 217         }
 218
 219         vq_ring_free_inorder(vq, used_idx, i);
 220         return i;
 221 }
 222
 223 #ifndef DEFAULT_TX_FREE_THRESH
 224 #define DEFAULT_TX_FREE_THRESH 32
 225 #endif
 226
 227 static void
 228 virtio_xmit_cleanup_inorder_packed(struct virtqueue *vq, int num)
 229 {
 230         uint16_t used_idx, id, curr_id, free_cnt = 0;
 231         uint16_t size = vq->vq_nentries;
 232         struct vring_packed_desc *desc = vq->vq_packed.ring.desc;
 233         struct vq_desc_extra *dxp;
 234
 235         used_idx = vq->vq_used_cons_idx;
 236         while (num > 0 && desc_is_used(&desc[used_idx], vq)) {
 237                 virtio_rmb(vq->hw->weak_barriers);
 238                 id = desc[used_idx].id;
 239                 do {
 240                         curr_id = used_idx;
 241                         dxp = &vq->vq_descx[used_idx];
 242                         used_idx += dxp->ndescs;
 243                         free_cnt += dxp->ndescs;
 244                         num -= dxp->ndescs;
 245                         if (used_idx >= size) {
 246                                 used_idx -= size;
 247                                 vq->vq_packed.used_wrap_counter ^= 1;
 248                         }
 249                         if (dxp->cookie != NULL) {
 250                                 rte_pktmbuf_free(dxp->cookie);
 251                                 dxp->cookie = NULL;
 252                         }
 253                 } while (curr_id != id);
 254         }
 255         vq->vq_used_cons_idx = used_idx;
 256         vq->vq_free_cnt += free_cnt;
 257 }
 258
 259 static void
 260 virtio_xmit_cleanup_normal_packed(struct virtqueue *vq, int num)
 261 {
 262         uint16_t used_idx, id;
 263         uint16_t size = vq->vq_nentries;
 264         struct vring_packed_desc *desc = vq->vq_packed.ring.desc;
 265         struct vq_desc_extra *dxp;
 266
 267         used_idx = vq->vq_used_cons_idx;
 268         while (num-- && desc_is_used(&desc[used_idx], vq)) {
 269                 virtio_rmb(vq->hw->weak_barriers);
 270                 id = desc[used_idx].id;
 271                 dxp = &vq->vq_descx[id];
 272                 vq->vq_used_cons_idx += dxp->ndescs;
 273                 if (vq->vq_used_cons_idx >= size) {
 274                         vq->vq_used_cons_idx -= size;
 275                         vq->vq_packed.used_wrap_counter ^= 1;
 276                 }
 277                 vq_ring_free_id_packed(vq, id);
 278                 if (dxp->cookie != NULL) {
 279                         rte_pktmbuf_free(dxp->cookie);
 280                         dxp->cookie = NULL;
 281                 }
 282                 used_idx = vq->vq_used_cons_idx;
 283         }
 284 }
 285
 286 /* Cleanup from completed transmits. */
 287 static inline void
 288 virtio_xmit_cleanup_packed(struct virtqueue *vq, int num, int in_order)
 289 {
 290         if (in_order)
 291                 virtio_xmit_cleanup_inorder_packed(vq, num);
 292         else
 293                 virtio_xmit_cleanup_normal_packed(vq, num);
 294 }
 295
 296 static void
 297 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
 298 {
 299         uint16_t i, used_idx, desc_idx;
 300         for (i = 0; i < num; i++) {
 301                 struct vring_used_elem *uep;
 302                 struct vq_desc_extra *dxp;
 303
 304                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
 305                 uep = &vq->vq_split.ring.used->ring[used_idx];
 306
 307                 desc_idx = (uint16_t) uep->id;
 308                 dxp = &vq->vq_descx[desc_idx];
 309                 vq->vq_used_cons_idx++;
 310                 vq_ring_free_chain(vq, desc_idx);
 311
 312                 if (dxp->cookie != NULL) {
 313                         rte_pktmbuf_free(dxp->cookie);
 314                         dxp->cookie = NULL;
 315                 }
 316         }
 317 }
 318
 319 /* Cleanup from completed inorder transmits. */
 320 static void
 321 virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num)
 322 {
 323         uint16_t i, idx = vq->vq_used_cons_idx;
 324         int16_t free_cnt = 0;
 325         struct vq_desc_extra *dxp = NULL;
 326
 327         if (unlikely(num == 0))
 328                 return;
 329
 330         for (i = 0; i < num; i++) {
 331                 dxp = &vq->vq_descx[idx++ & (vq->vq_nentries - 1)];
 332                 free_cnt += dxp->ndescs;
 333                 if (dxp->cookie != NULL) {
 334                         rte_pktmbuf_free(dxp->cookie);
 335                         dxp->cookie = NULL;
 336                 }
 337         }
 338
 339         vq->vq_free_cnt += free_cnt;
 340         vq->vq_used_cons_idx = idx;
 341 }
 342
 343 static inline int
 344 virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
 345                         struct rte_mbuf **cookies,
 346                         uint16_t num)
 347 {
 348         struct vq_desc_extra *dxp;
 349         struct virtio_hw *hw = vq->hw;
 350         struct vring_desc *start_dp;
 351         uint16_t head_idx, idx, i = 0;
 352
 353         if (unlikely(vq->vq_free_cnt == 0))
 354                 return -ENOSPC;
 355         if (unlikely(vq->vq_free_cnt < num))
 356                 return -EMSGSIZE;
 357
 358         head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
 359         start_dp = vq->vq_split.ring.desc;
 360
 361         while (i < num) {
 362                 idx = head_idx & (vq->vq_nentries - 1);
 363                 dxp = &vq->vq_descx[idx];
 364                 dxp->cookie = (void *)cookies[i];
 365                 dxp->ndescs = 1;
 366
 367                 start_dp[idx].addr =
 368                                 VIRTIO_MBUF_ADDR(cookies[i], vq) +
 369                                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 370                 start_dp[idx].len =
 371                                 cookies[i]->buf_len -
 372                                 RTE_PKTMBUF_HEADROOM +
 373                                 hw->vtnet_hdr_size;
 374                 start_dp[idx].flags =  VRING_DESC_F_WRITE;
 375
 376                 vq_update_avail_ring(vq, idx);
 377                 head_idx++;
 378                 i++;
 379         }
 380
 381         vq->vq_desc_head_idx += num;
 382         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 383         return 0;
 384 }
 385
 386 static inline int
 387 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf **cookie,
 388                                 uint16_t num)
 389 {
 390         struct vq_desc_extra *dxp;
 391         struct virtio_hw *hw = vq->hw;
 392         struct vring_desc *start_dp = vq->vq_split.ring.desc;
 393         uint16_t idx, i;
 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         if (unlikely(vq->vq_desc_head_idx >= vq->vq_nentries))
 401                 return -EFAULT;
 402
 403         for (i = 0; i < num; i++) {
 404                 idx = vq->vq_desc_head_idx;
 405                 dxp = &vq->vq_descx[idx];
 406                 dxp->cookie = (void *)cookie[i];
 407                 dxp->ndescs = 1;
 408
 409                 start_dp[idx].addr =
 410                         VIRTIO_MBUF_ADDR(cookie[i], vq) +
 411                         RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 412                 start_dp[idx].len =
 413                         cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM +
 414                         hw->vtnet_hdr_size;
 415                 start_dp[idx].flags = VRING_DESC_F_WRITE;
 416                 vq->vq_desc_head_idx = start_dp[idx].next;
 417                 vq_update_avail_ring(vq, idx);
 418                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END) {
 419                         vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
 420                         break;
 421                 }
 422         }
 423
 424         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 425
 426         return 0;
 427 }
 428
 429 static inline int
 430 virtqueue_enqueue_recv_refill_packed(struct virtqueue *vq,
 431                                      struct rte_mbuf **cookie, uint16_t num)
 432 {
 433         struct vring_packed_desc *start_dp = vq->vq_packed.ring.desc;
 434         uint16_t flags = vq->vq_packed.cached_flags;
 435         struct virtio_hw *hw = vq->hw;
 436         struct vq_desc_extra *dxp;
 437         uint16_t idx;
 438         int i;
 439
 440         if (unlikely(vq->vq_free_cnt == 0))
 441                 return -ENOSPC;
 442         if (unlikely(vq->vq_free_cnt < num))
 443                 return -EMSGSIZE;
 444
 445         for (i = 0; i < num; i++) {
 446                 idx = vq->vq_avail_idx;
 447                 dxp = &vq->vq_descx[idx];
 448                 dxp->cookie = (void *)cookie[i];
 449                 dxp->ndescs = 1;
 450
 451                 start_dp[idx].addr = VIRTIO_MBUF_ADDR(cookie[i], vq) +
 452                                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 453                 start_dp[idx].len = cookie[i]->buf_len - RTE_PKTMBUF_HEADROOM
 454                                         + hw->vtnet_hdr_size;
 455
 456                 vq->vq_desc_head_idx = dxp->next;
 457                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 458                         vq->vq_desc_tail_idx = vq->vq_desc_head_idx;
 459                 virtio_wmb(hw->weak_barriers);
 460                 start_dp[idx].flags = flags;
 461                 if (++vq->vq_avail_idx >= vq->vq_nentries) {
 462                         vq->vq_avail_idx -= vq->vq_nentries;
 463                         vq->vq_packed.cached_flags ^=
 464                                 VRING_PACKED_DESC_F_AVAIL_USED;
 465                         flags = vq->vq_packed.cached_flags;
 466                 }
 467         }
 468         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 469         return 0;
 470 }
 471
 472 /* When doing TSO, the IP length is not included in the pseudo header
 473  * checksum of the packet given to the PMD, but for virtio it is
 474  * expected.
 475  */
 476 static void
 477 virtio_tso_fix_cksum(struct rte_mbuf *m)
 478 {
 479         /* common case: header is not fragmented */
 480         if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
 481                         m->l4_len)) {
 482                 struct ipv4_hdr *iph;
 483                 struct ipv6_hdr *ip6h;
 484                 struct tcp_hdr *th;
 485                 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
 486                 uint32_t tmp;
 487
 488                 iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
 489                 th = RTE_PTR_ADD(iph, m->l3_len);
 490                 if ((iph->version_ihl >> 4) == 4) {
 491                         iph->hdr_checksum = 0;
 492                         iph->hdr_checksum = rte_ipv4_cksum(iph);
 493                         ip_len = iph->total_length;
 494                         ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
 495                                 m->l3_len);
 496                 } else {
 497                         ip6h = (struct ipv6_hdr *)iph;
 498                         ip_paylen = ip6h->payload_len;
 499                 }
 500
 501                 /* calculate the new phdr checksum not including ip_paylen */
 502                 prev_cksum = th->cksum;
 503                 tmp = prev_cksum;
 504                 tmp += ip_paylen;
 505                 tmp = (tmp & 0xffff) + (tmp >> 16);
 506                 new_cksum = tmp;
 507
 508                 /* replace it in the packet */
 509                 th->cksum = new_cksum;
 510         }
 511 }
 512
 513
 514 /* avoid write operation when necessary, to lessen cache issues */
 515 #define ASSIGN_UNLESS_EQUAL(var, val) do {      \
 516         if ((var) != (val))                     \
 517                 (var) = (val);                  \
 518 } while (0)
 519
 520 #define virtqueue_clear_net_hdr(_hdr) do {              \
 521         ASSIGN_UNLESS_EQUAL((_hdr)->csum_start, 0);     \
 522         ASSIGN_UNLESS_EQUAL((_hdr)->csum_offset, 0);    \
 523         ASSIGN_UNLESS_EQUAL((_hdr)->flags, 0);          \
 524         ASSIGN_UNLESS_EQUAL((_hdr)->gso_type, 0);       \
 525         ASSIGN_UNLESS_EQUAL((_hdr)->gso_size, 0);       \
 526         ASSIGN_UNLESS_EQUAL((_hdr)->hdr_len, 0);        \
 527 } while (0)
 528
 529 static inline void
 530 virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
 531                         struct rte_mbuf *cookie,
 532                         bool offload)
 533 {
 534         if (offload) {
 535                 if (cookie->ol_flags & PKT_TX_TCP_SEG)
 536                         cookie->ol_flags |= PKT_TX_TCP_CKSUM;
 537
 538                 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
 539                 case PKT_TX_UDP_CKSUM:
 540                         hdr->csum_start = cookie->l2_len + cookie->l3_len;
 541                         hdr->csum_offset = offsetof(struct udp_hdr,
 542                                 dgram_cksum);
 543                         hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 544                         break;
 545
 546                 case PKT_TX_TCP_CKSUM:
 547                         hdr->csum_start = cookie->l2_len + cookie->l3_len;
 548                         hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
 549                         hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 550                         break;
 551
 552                 default:
 553                         ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
 554                         ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
 555                         ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
 556                         break;
 557                 }
 558
 559                 /* TCP Segmentation Offload */
 560                 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
 561                         virtio_tso_fix_cksum(cookie);
 562                         hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
 563                                 VIRTIO_NET_HDR_GSO_TCPV6 :
 564                                 VIRTIO_NET_HDR_GSO_TCPV4;
 565                         hdr->gso_size = cookie->tso_segsz;
 566                         hdr->hdr_len =
 567                                 cookie->l2_len +
 568                                 cookie->l3_len +
 569                                 cookie->l4_len;
 570                 } else {
 571                         ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
 572                         ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
 573                         ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
 574                 }
 575         }
 576 }
 577
 578 static inline void
 579 virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
 580                         struct rte_mbuf **cookies,
 581                         uint16_t num)
 582 {
 583         struct vq_desc_extra *dxp;
 584         struct virtqueue *vq = txvq->vq;
 585         struct vring_desc *start_dp;
 586         struct virtio_net_hdr *hdr;
 587         uint16_t idx;
 588         uint16_t head_size = vq->hw->vtnet_hdr_size;
 589         uint16_t i = 0;
 590
 591         idx = vq->vq_desc_head_idx;
 592         start_dp = vq->vq_split.ring.desc;
 593
 594         while (i < num) {
 595                 idx = idx & (vq->vq_nentries - 1);
 596                 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
 597                 dxp->cookie = (void *)cookies[i];
 598                 dxp->ndescs = 1;
 599
 600                 hdr = (struct virtio_net_hdr *)
 601                         rte_pktmbuf_prepend(cookies[i], head_size);
 602                 cookies[i]->pkt_len -= head_size;
 603
 604                 /* if offload disabled, hdr is not zeroed yet, do it now */
 605                 if (!vq->hw->has_tx_offload)
 606                         virtqueue_clear_net_hdr(hdr);
 607                 else
 608                         virtqueue_xmit_offload(hdr, cookies[i], true);
 609
 610                 start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq);
 611                 start_dp[idx].len   = cookies[i]->data_len;
 612                 start_dp[idx].flags = 0;
 613
 614                 vq_update_avail_ring(vq, idx);
 615
 616                 idx++;
 617                 i++;
 618         };
 619
 620         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 621         vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
 622 }
 623
 624 static inline void
 625 virtqueue_enqueue_xmit_packed_fast(struct virtnet_tx *txvq,
 626                                    struct rte_mbuf *cookie,
 627                                    int in_order)
 628 {
 629         struct virtqueue *vq = txvq->vq;
 630         struct vring_packed_desc *dp;
 631         struct vq_desc_extra *dxp;
 632         uint16_t idx, id, flags;
 633         uint16_t head_size = vq->hw->vtnet_hdr_size;
 634         struct virtio_net_hdr *hdr;
 635
 636         id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
 637         idx = vq->vq_avail_idx;
 638         dp = &vq->vq_packed.ring.desc[idx];
 639
 640         dxp = &vq->vq_descx[id];
 641         dxp->ndescs = 1;
 642         dxp->cookie = cookie;
 643
 644         flags = vq->vq_packed.cached_flags;
 645
 646         /* prepend cannot fail, checked by caller */
 647         hdr = (struct virtio_net_hdr *)
 648                 rte_pktmbuf_prepend(cookie, head_size);
 649         cookie->pkt_len -= head_size;
 650
 651         /* if offload disabled, hdr is not zeroed yet, do it now */
 652         if (!vq->hw->has_tx_offload)
 653                 virtqueue_clear_net_hdr(hdr);
 654         else
 655                 virtqueue_xmit_offload(hdr, cookie, true);
 656
 657         dp->addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 658         dp->len  = cookie->data_len;
 659         dp->id   = id;
 660
 661         if (++vq->vq_avail_idx >= vq->vq_nentries) {
 662                 vq->vq_avail_idx -= vq->vq_nentries;
 663                 vq->vq_packed.cached_flags ^= VRING_PACKED_DESC_F_AVAIL_USED;
 664         }
 665
 666         vq->vq_free_cnt--;
 667
 668         if (!in_order) {
 669                 vq->vq_desc_head_idx = dxp->next;
 670                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 671                         vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
 672         }
 673
 674         virtio_wmb(vq->hw->weak_barriers);
 675         dp->flags = flags;
 676 }
 677
 678 static inline void
 679 virtqueue_enqueue_xmit_packed(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 680                               uint16_t needed, int can_push, int in_order)
 681 {
 682         struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 683         struct vq_desc_extra *dxp;
 684         struct virtqueue *vq = txvq->vq;
 685         struct vring_packed_desc *start_dp, *head_dp;
 686         uint16_t idx, id, head_idx, head_flags;
 687         uint16_t head_size = vq->hw->vtnet_hdr_size;
 688         struct virtio_net_hdr *hdr;
 689         uint16_t prev;
 690
 691         id = in_order ? vq->vq_avail_idx : vq->vq_desc_head_idx;
 692
 693         dxp = &vq->vq_descx[id];
 694         dxp->ndescs = needed;
 695         dxp->cookie = cookie;
 696
 697         head_idx = vq->vq_avail_idx;
 698         idx = head_idx;
 699         prev = head_idx;
 700         start_dp = vq->vq_packed.ring.desc;
 701
 702         head_dp = &vq->vq_packed.ring.desc[idx];
 703         head_flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 704         head_flags |= vq->vq_packed.cached_flags;
 705
 706         if (can_push) {
 707                 /* prepend cannot fail, checked by caller */
 708                 hdr = (struct virtio_net_hdr *)
 709                         rte_pktmbuf_prepend(cookie, head_size);
 710                 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
 711                  * which is wrong. Below subtract restores correct pkt size.
 712                  */
 713                 cookie->pkt_len -= head_size;
 714
 715                 /* if offload disabled, it is not zeroed below, do it now */
 716                 if (!vq->hw->has_tx_offload)
 717                         virtqueue_clear_net_hdr(hdr);
 718         } else {
 719                 /* setup first tx ring slot to point to header
 720                  * stored in reserved region.
 721                  */
 722                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 723                         RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
 724                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
 725                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 726                 idx++;
 727                 if (idx >= vq->vq_nentries) {
 728                         idx -= vq->vq_nentries;
 729                         vq->vq_packed.cached_flags ^=
 730                                 VRING_PACKED_DESC_F_AVAIL_USED;
 731                 }
 732         }
 733
 734         virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
 735
 736         do {
 737                 uint16_t flags;
 738
 739                 start_dp[idx].addr = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 740                 start_dp[idx].len  = cookie->data_len;
 741                 if (likely(idx != head_idx)) {
 742                         flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 743                         flags |= vq->vq_packed.cached_flags;
 744                         start_dp[idx].flags = flags;
 745                 }
 746                 prev = idx;
 747                 idx++;
 748                 if (idx >= vq->vq_nentries) {
 749                         idx -= vq->vq_nentries;
 750                         vq->vq_packed.cached_flags ^=
 751                                 VRING_PACKED_DESC_F_AVAIL_USED;
 752                 }
 753         } while ((cookie = cookie->next) != NULL);
 754
 755         start_dp[prev].id = id;
 756
 757         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 758         vq->vq_avail_idx = idx;
 759
 760         if (!in_order) {
 761                 vq->vq_desc_head_idx = dxp->next;
 762                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 763                         vq->vq_desc_tail_idx = VQ_RING_DESC_CHAIN_END;
 764         }
 765
 766         virtio_wmb(vq->hw->weak_barriers);
 767         head_dp->flags = head_flags;
 768 }
 769
 770 static inline void
 771 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 772                         uint16_t needed, int use_indirect, int can_push,
 773                         int in_order)
 774 {
 775         struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 776         struct vq_desc_extra *dxp;
 777         struct virtqueue *vq = txvq->vq;
 778         struct vring_desc *start_dp;
 779         uint16_t seg_num = cookie->nb_segs;
 780         uint16_t head_idx, idx;
 781         uint16_t head_size = vq->hw->vtnet_hdr_size;
 782         struct virtio_net_hdr *hdr;
 783
 784         head_idx = vq->vq_desc_head_idx;
 785         idx = head_idx;
 786         if (in_order)
 787                 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
 788         else
 789                 dxp = &vq->vq_descx[idx];
 790         dxp->cookie = (void *)cookie;
 791         dxp->ndescs = needed;
 792
 793         start_dp = vq->vq_split.ring.desc;
 794
 795         if (can_push) {
 796                 /* prepend cannot fail, checked by caller */
 797                 hdr = (struct virtio_net_hdr *)
 798                         rte_pktmbuf_prepend(cookie, head_size);
 799                 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
 800                  * which is wrong. Below subtract restores correct pkt size.
 801                  */
 802                 cookie->pkt_len -= head_size;
 803
 804                 /* if offload disabled, it is not zeroed below, do it now */
 805                 if (!vq->hw->has_tx_offload)
 806                         virtqueue_clear_net_hdr(hdr);
 807         } else if (use_indirect) {
 808                 /* setup tx ring slot to point to indirect
 809                  * descriptor list stored in reserved region.
 810                  *
 811                  * the first slot in indirect ring is already preset
 812                  * to point to the header in reserved region
 813                  */
 814                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 815                         RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
 816                 start_dp[idx].len   = (seg_num + 1) * sizeof(struct vring_desc);
 817                 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
 818                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 819
 820                 /* loop below will fill in rest of the indirect elements */
 821                 start_dp = txr[idx].tx_indir;
 822                 idx = 1;
 823         } else {
 824                 /* setup first tx ring slot to point to header
 825                  * stored in reserved region.
 826                  */
 827                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 828                         RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
 829                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
 830                 start_dp[idx].flags = VRING_DESC_F_NEXT;
 831                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 832
 833                 idx = start_dp[idx].next;
 834         }
 835
 836         virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
 837
 838         do {
 839                 start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 840                 start_dp[idx].len   = cookie->data_len;
 841                 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 842                 idx = start_dp[idx].next;
 843         } while ((cookie = cookie->next) != NULL);
 844
 845         if (use_indirect)
 846                 idx = vq->vq_split.ring.desc[head_idx].next;
 847
 848         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 849
 850         vq->vq_desc_head_idx = idx;
 851         vq_update_avail_ring(vq, head_idx);
 852
 853         if (!in_order) {
 854                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 855                         vq->vq_desc_tail_idx = idx;
 856         }
 857 }
 858
 859 void
 860 virtio_dev_cq_start(struct rte_eth_dev *dev)
 861 {
 862         struct virtio_hw *hw = dev->data->dev_private;
 863
 864         if (hw->cvq && hw->cvq->vq) {
 865                 rte_spinlock_init(&hw->cvq->lock);
 866                 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
 867         }
 868 }
 869
 870 int
 871 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
 872                         uint16_t queue_idx,
 873                         uint16_t nb_desc,
 874                         unsigned int socket_id __rte_unused,
 875                         const struct rte_eth_rxconf *rx_conf __rte_unused,
 876                         struct rte_mempool *mp)
 877 {
 878         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 879         struct virtio_hw *hw = dev->data->dev_private;
 880         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 881         struct virtnet_rx *rxvq;
 882
 883         PMD_INIT_FUNC_TRACE();
 884
 885         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
 886                 nb_desc = vq->vq_nentries;
 887         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 888
 889         rxvq = &vq->rxq;
 890         rxvq->queue_id = queue_idx;
 891         rxvq->mpool = mp;
 892         if (rxvq->mpool == NULL) {
 893                 rte_exit(EXIT_FAILURE,
 894                         "Cannot allocate mbufs for rx virtqueue");
 895         }
 896
 897         dev->data->rx_queues[queue_idx] = rxvq;
 898
 899         return 0;
 900 }
 901
 902 int
 903 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
 904 {
 905         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 906         struct virtio_hw *hw = dev->data->dev_private;
 907         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 908         struct virtnet_rx *rxvq = &vq->rxq;
 909         struct rte_mbuf *m;
 910         uint16_t desc_idx;
 911         int error, nbufs, i;
 912
 913         PMD_INIT_FUNC_TRACE();
 914
 915         /* Allocate blank mbufs for the each rx descriptor */
 916         nbufs = 0;
 917
 918         if (hw->use_simple_rx) {
 919                 for (desc_idx = 0; desc_idx < vq->vq_nentries;
 920                      desc_idx++) {
 921                         vq->vq_split.ring.avail->ring[desc_idx] = desc_idx;
 922                         vq->vq_split.ring.desc[desc_idx].flags =
 923                                 VRING_DESC_F_WRITE;
 924                 }
 925
 926                 virtio_rxq_vec_setup(rxvq);
 927         }
 928
 929         memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
 930         for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
 931              desc_idx++) {
 932                 vq->sw_ring[vq->vq_nentries + desc_idx] =
 933                         &rxvq->fake_mbuf;
 934         }
 935
 936         if (hw->use_simple_rx) {
 937                 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
 938                         virtio_rxq_rearm_vec(rxvq);
 939                         nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
 940                 }
 941         } else if (hw->use_inorder_rx) {
 942                 if ((!virtqueue_full(vq))) {
 943                         uint16_t free_cnt = vq->vq_free_cnt;
 944                         struct rte_mbuf *pkts[free_cnt];
 945
 946                         if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
 947                                 free_cnt)) {
 948                                 error = virtqueue_enqueue_refill_inorder(vq,
 949                                                 pkts,
 950                                                 free_cnt);
 951                                 if (unlikely(error)) {
 952                                         for (i = 0; i < free_cnt; i++)
 953                                                 rte_pktmbuf_free(pkts[i]);
 954                                 }
 955                         }
 956
 957                         nbufs += free_cnt;
 958                         vq_update_avail_idx(vq);
 959                 }
 960         } else {
 961                 while (!virtqueue_full(vq)) {
 962                         m = rte_mbuf_raw_alloc(rxvq->mpool);
 963                         if (m == NULL)
 964                                 break;
 965
 966                         /* Enqueue allocated buffers */
 967                         if (vtpci_packed_queue(vq->hw))
 968                                 error = virtqueue_enqueue_recv_refill_packed(vq,
 969                                                 &m, 1);
 970                         else
 971                                 error = virtqueue_enqueue_recv_refill(vq,
 972                                                 &m, 1);
 973                         if (error) {
 974                                 rte_pktmbuf_free(m);
 975                                 break;
 976                         }
 977                         nbufs++;
 978                 }
 979
 980                 if (!vtpci_packed_queue(vq->hw))
 981                         vq_update_avail_idx(vq);
 982         }
 983
 984         PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
 985
 986         VIRTQUEUE_DUMP(vq);
 987
 988         return 0;
 989 }
 990
 991 /*
 992  * struct rte_eth_dev *dev: Used to update dev
 993  * uint16_t nb_desc: Defaults to values read from config space
 994  * unsigned int socket_id: Used to allocate memzone
 995  * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
 996  * uint16_t queue_idx: Just used as an index in dev txq list
 997  */
 998 int
 999 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
1000                         uint16_t queue_idx,
1001                         uint16_t nb_desc,
1002                         unsigned int socket_id __rte_unused,
1003                         const struct rte_eth_txconf *tx_conf)
1004 {
1005         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
1006         struct virtio_hw *hw = dev->data->dev_private;
1007         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
1008         struct virtnet_tx *txvq;
1009         uint16_t tx_free_thresh;
1010
1011         PMD_INIT_FUNC_TRACE();
1012
1013         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
1014                 nb_desc = vq->vq_nentries;
1015         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
1016
1017         txvq = &vq->txq;
1018         txvq->queue_id = queue_idx;
1019
1020         tx_free_thresh = tx_conf->tx_free_thresh;
1021         if (tx_free_thresh == 0)
1022                 tx_free_thresh =
1023                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
1024
1025         if (tx_free_thresh >= (vq->vq_nentries - 3)) {
1026                 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
1027                         "number of TX entries minus 3 (%u)."
1028                         " (tx_free_thresh=%u port=%u queue=%u)\n",
1029                         vq->vq_nentries - 3,
1030                         tx_free_thresh, dev->data->port_id, queue_idx);
1031                 return -EINVAL;
1032         }
1033
1034         vq->vq_free_thresh = tx_free_thresh;
1035
1036         dev->data->tx_queues[queue_idx] = txvq;
1037         return 0;
1038 }
1039
1040 int
1041 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
1042                                 uint16_t queue_idx)
1043 {
1044         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
1045         struct virtio_hw *hw = dev->data->dev_private;
1046         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
1047
1048         PMD_INIT_FUNC_TRACE();
1049
1050         if (!vtpci_packed_queue(hw)) {
1051                 if (hw->use_inorder_tx)
1052                         vq->vq_split.ring.desc[vq->vq_nentries - 1].next = 0;
1053         }
1054
1055         VIRTQUEUE_DUMP(vq);
1056
1057         return 0;
1058 }
1059
1060 static inline void
1061 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
1062 {
1063         int error;
1064         /*
1065          * Requeue the discarded mbuf. This should always be
1066          * successful since it was just dequeued.
1067          */
1068         if (vtpci_packed_queue(vq->hw))
1069                 error = virtqueue_enqueue_recv_refill_packed(vq, &m, 1);
1070         else
1071                 error = virtqueue_enqueue_recv_refill(vq, &m, 1);
1072
1073         if (unlikely(error)) {
1074                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
1075                 rte_pktmbuf_free(m);
1076         }
1077 }
1078
1079 static inline void
1080 virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
1081 {
1082         int error;
1083
1084         error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
1085         if (unlikely(error)) {
1086                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
1087                 rte_pktmbuf_free(m);
1088         }
1089 }
1090
1091 static inline void
1092 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
1093 {
1094         uint32_t s = mbuf->pkt_len;
1095         struct rte_ether_addr *ea;
1096
1097         stats->bytes += s;
1098
1099         if (s == 64) {
1100                 stats->size_bins[1]++;
1101         } else if (s > 64 && s < 1024) {
1102                 uint32_t bin;
1103
1104                 /* count zeros, and offset into correct bin */
1105                 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
1106                 stats->size_bins[bin]++;
1107         } else {
1108                 if (s < 64)
1109                         stats->size_bins[0]++;
1110                 else if (s < 1519)
1111                         stats->size_bins[6]++;
1112                 else
1113                         stats->size_bins[7]++;
1114         }
1115
1116         ea = rte_pktmbuf_mtod(mbuf, struct rte_ether_addr *);
1117         if (is_multicast_ether_addr(ea)) {
1118                 if (is_broadcast_ether_addr(ea))
1119                         stats->broadcast++;
1120                 else
1121                         stats->multicast++;
1122         }
1123 }
1124
1125 static inline void
1126 virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
1127 {
1128         VIRTIO_DUMP_PACKET(m, m->data_len);
1129
1130         virtio_update_packet_stats(&rxvq->stats, m);
1131 }
1132
1133 /* Optionally fill offload information in structure */
1134 static inline int
1135 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
1136 {
1137         struct rte_net_hdr_lens hdr_lens;
1138         uint32_t hdrlen, ptype;
1139         int l4_supported = 0;
1140
1141         /* nothing to do */
1142         if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
1143                 return 0;
1144
1145         m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
1146
1147         ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
1148         m->packet_type = ptype;
1149         if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
1150             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
1151             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
1152                 l4_supported = 1;
1153
1154         if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
1155                 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
1156                 if (hdr->csum_start <= hdrlen && l4_supported) {
1157                         m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
1158                 } else {
1159                         /* Unknown proto or tunnel, do sw cksum. We can assume
1160                          * the cksum field is in the first segment since the
1161                          * buffers we provided to the host are large enough.
1162                          * In case of SCTP, this will be wrong since it's a CRC
1163                          * but there's nothing we can do.
1164                          */
1165                         uint16_t csum = 0, off;
1166
1167                         rte_raw_cksum_mbuf(m, hdr->csum_start,
1168                                 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
1169                                 &csum);
1170                         if (likely(csum != 0xffff))
1171                                 csum = ~csum;
1172                         off = hdr->csum_offset + hdr->csum_start;
1173                         if (rte_pktmbuf_data_len(m) >= off + 1)
1174                                 *rte_pktmbuf_mtod_offset(m, uint16_t *,
1175                                         off) = csum;
1176                 }
1177         } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
1178                 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
1179         }
1180
1181         /* GSO request, save required information in mbuf */
1182         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
1183                 /* Check unsupported modes */
1184                 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
1185                     (hdr->gso_size == 0)) {
1186                         return -EINVAL;
1187                 }
1188
1189                 /* Update mss lengthes in mbuf */
1190                 m->tso_segsz = hdr->gso_size;
1191                 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
1192                         case VIRTIO_NET_HDR_GSO_TCPV4:
1193                         case VIRTIO_NET_HDR_GSO_TCPV6:
1194                                 m->ol_flags |= PKT_RX_LRO | \
1195                                         PKT_RX_L4_CKSUM_NONE;
1196                                 break;
1197                         default:
1198                                 return -EINVAL;
1199                 }
1200         }
1201
1202         return 0;
1203 }
1204
1205 #define VIRTIO_MBUF_BURST_SZ 64
1206 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
1207 uint16_t
1208 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
1209 {
1210         struct virtnet_rx *rxvq = rx_queue;
1211         struct virtqueue *vq = rxvq->vq;
1212         struct virtio_hw *hw = vq->hw;
1213         struct rte_mbuf *rxm;
1214         uint16_t nb_used, num, nb_rx;
1215         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1216         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1217         int error;
1218         uint32_t i, nb_enqueued;
1219         uint32_t hdr_size;
1220         struct virtio_net_hdr *hdr;
1221
1222         nb_rx = 0;
1223         if (unlikely(hw->started == 0))
1224                 return nb_rx;
1225
1226         nb_used = VIRTQUEUE_NUSED(vq);
1227
1228         virtio_rmb(hw->weak_barriers);
1229
1230         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1231         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1232                 num = VIRTIO_MBUF_BURST_SZ;
1233         if (likely(num > DESC_PER_CACHELINE))
1234                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1235
1236         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1237         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
1238
1239         nb_enqueued = 0;
1240         hdr_size = hw->vtnet_hdr_size;
1241
1242         for (i = 0; i < num ; i++) {
1243                 rxm = rcv_pkts[i];
1244
1245                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1246
1247                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
1248                         PMD_RX_LOG(ERR, "Packet drop");
1249                         nb_enqueued++;
1250                         virtio_discard_rxbuf(vq, rxm);
1251                         rxvq->stats.errors++;
1252                         continue;
1253                 }
1254
1255                 rxm->port = rxvq->port_id;
1256                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1257                 rxm->ol_flags = 0;
1258                 rxm->vlan_tci = 0;
1259
1260                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1261                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1262
1263                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1264                         RTE_PKTMBUF_HEADROOM - hdr_size);
1265
1266                 if (hw->vlan_strip)
1267                         rte_vlan_strip(rxm);
1268
1269                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1270                         virtio_discard_rxbuf(vq, rxm);
1271                         rxvq->stats.errors++;
1272                         continue;
1273                 }
1274
1275                 virtio_rx_stats_updated(rxvq, rxm);
1276
1277                 rx_pkts[nb_rx++] = rxm;
1278         }
1279
1280         rxvq->stats.packets += nb_rx;
1281
1282         /* Allocate new mbuf for the used descriptor */
1283         if (likely(!virtqueue_full(vq))) {
1284                 uint16_t free_cnt = vq->vq_free_cnt;
1285                 struct rte_mbuf *new_pkts[free_cnt];
1286
1287                 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1288                                                 free_cnt) == 0)) {
1289                         error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1290                                         free_cnt);
1291                         if (unlikely(error)) {
1292                                 for (i = 0; i < free_cnt; i++)
1293                                         rte_pktmbuf_free(new_pkts[i]);
1294                         }
1295                         nb_enqueued += free_cnt;
1296                 } else {
1297                         struct rte_eth_dev *dev =
1298                                 &rte_eth_devices[rxvq->port_id];
1299                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1300                 }
1301         }
1302
1303         if (likely(nb_enqueued)) {
1304                 vq_update_avail_idx(vq);
1305
1306                 if (unlikely(virtqueue_kick_prepare(vq))) {
1307                         virtqueue_notify(vq);
1308                         PMD_RX_LOG(DEBUG, "Notified");
1309                 }
1310         }
1311
1312         return nb_rx;
1313 }
1314
1315 uint16_t
1316 virtio_recv_pkts_packed(void *rx_queue, struct rte_mbuf **rx_pkts,
1317                         uint16_t nb_pkts)
1318 {
1319         struct virtnet_rx *rxvq = rx_queue;
1320         struct virtqueue *vq = rxvq->vq;
1321         struct virtio_hw *hw = vq->hw;
1322         struct rte_mbuf *rxm;
1323         uint16_t num, nb_rx;
1324         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1325         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1326         int error;
1327         uint32_t i, nb_enqueued;
1328         uint32_t hdr_size;
1329         struct virtio_net_hdr *hdr;
1330
1331         nb_rx = 0;
1332         if (unlikely(hw->started == 0))
1333                 return nb_rx;
1334
1335         num = RTE_MIN(VIRTIO_MBUF_BURST_SZ, nb_pkts);
1336         if (likely(num > DESC_PER_CACHELINE))
1337                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1338
1339         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1340         PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1341
1342         nb_enqueued = 0;
1343         hdr_size = hw->vtnet_hdr_size;
1344
1345         for (i = 0; i < num; i++) {
1346                 rxm = rcv_pkts[i];
1347
1348                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1349
1350                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
1351                         PMD_RX_LOG(ERR, "Packet drop");
1352                         nb_enqueued++;
1353                         virtio_discard_rxbuf(vq, rxm);
1354                         rxvq->stats.errors++;
1355                         continue;
1356                 }
1357
1358                 rxm->port = rxvq->port_id;
1359                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1360                 rxm->ol_flags = 0;
1361                 rxm->vlan_tci = 0;
1362
1363                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1364                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1365
1366                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
1367                         RTE_PKTMBUF_HEADROOM - hdr_size);
1368
1369                 if (hw->vlan_strip)
1370                         rte_vlan_strip(rxm);
1371
1372                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
1373                         virtio_discard_rxbuf(vq, rxm);
1374                         rxvq->stats.errors++;
1375                         continue;
1376                 }
1377
1378                 virtio_rx_stats_updated(rxvq, rxm);
1379
1380                 rx_pkts[nb_rx++] = rxm;
1381         }
1382
1383         rxvq->stats.packets += nb_rx;
1384
1385         /* Allocate new mbuf for the used descriptor */
1386         if (likely(!virtqueue_full(vq))) {
1387                 uint16_t free_cnt = vq->vq_free_cnt;
1388                 struct rte_mbuf *new_pkts[free_cnt];
1389
1390                 if (likely(rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts,
1391                                                 free_cnt) == 0)) {
1392                         error = virtqueue_enqueue_recv_refill_packed(vq,
1393                                         new_pkts, free_cnt);
1394                         if (unlikely(error)) {
1395                                 for (i = 0; i < free_cnt; i++)
1396                                         rte_pktmbuf_free(new_pkts[i]);
1397                         }
1398                         nb_enqueued += free_cnt;
1399                 } else {
1400                         struct rte_eth_dev *dev =
1401                                 &rte_eth_devices[rxvq->port_id];
1402                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1403                 }
1404         }
1405
1406         if (likely(nb_enqueued)) {
1407                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1408                         virtqueue_notify(vq);
1409                         PMD_RX_LOG(DEBUG, "Notified");
1410                 }
1411         }
1412
1413         return nb_rx;
1414 }
1415
1416
1417 uint16_t
1418 virtio_recv_pkts_inorder(void *rx_queue,
1419                         struct rte_mbuf **rx_pkts,
1420                         uint16_t nb_pkts)
1421 {
1422         struct virtnet_rx *rxvq = rx_queue;
1423         struct virtqueue *vq = rxvq->vq;
1424         struct virtio_hw *hw = vq->hw;
1425         struct rte_mbuf *rxm;
1426         struct rte_mbuf *prev;
1427         uint16_t nb_used, num, nb_rx;
1428         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1429         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1430         int error;
1431         uint32_t nb_enqueued;
1432         uint32_t seg_num;
1433         uint32_t seg_res;
1434         uint32_t hdr_size;
1435         int32_t i;
1436
1437         nb_rx = 0;
1438         if (unlikely(hw->started == 0))
1439                 return nb_rx;
1440
1441         nb_used = VIRTQUEUE_NUSED(vq);
1442         nb_used = RTE_MIN(nb_used, nb_pkts);
1443         nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ);
1444
1445         virtio_rmb(hw->weak_barriers);
1446
1447         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1448
1449         nb_enqueued = 0;
1450         seg_num = 1;
1451         seg_res = 0;
1452         hdr_size = hw->vtnet_hdr_size;
1453
1454         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
1455
1456         for (i = 0; i < num; i++) {
1457                 struct virtio_net_hdr_mrg_rxbuf *header;
1458
1459                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1460                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1461
1462                 rxm = rcv_pkts[i];
1463
1464                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
1465                         PMD_RX_LOG(ERR, "Packet drop");
1466                         nb_enqueued++;
1467                         virtio_discard_rxbuf_inorder(vq, rxm);
1468                         rxvq->stats.errors++;
1469                         continue;
1470                 }
1471
1472                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1473                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1474                          - hdr_size);
1475
1476                 if (vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
1477                         seg_num = header->num_buffers;
1478                         if (seg_num == 0)
1479                                 seg_num = 1;
1480                 } else {
1481                         seg_num = 1;
1482                 }
1483
1484                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1485                 rxm->nb_segs = seg_num;
1486                 rxm->ol_flags = 0;
1487                 rxm->vlan_tci = 0;
1488                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1489                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1490
1491                 rxm->port = rxvq->port_id;
1492
1493                 rx_pkts[nb_rx] = rxm;
1494                 prev = rxm;
1495
1496                 if (vq->hw->has_rx_offload &&
1497                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1498                         virtio_discard_rxbuf_inorder(vq, rxm);
1499                         rxvq->stats.errors++;
1500                         continue;
1501                 }
1502
1503                 if (hw->vlan_strip)
1504                         rte_vlan_strip(rx_pkts[nb_rx]);
1505
1506                 seg_res = seg_num - 1;
1507
1508                 /* Merge remaining segments */
1509                 while (seg_res != 0 && i < (num - 1)) {
1510                         i++;
1511
1512                         rxm = rcv_pkts[i];
1513                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1514                         rxm->pkt_len = (uint32_t)(len[i]);
1515                         rxm->data_len = (uint16_t)(len[i]);
1516
1517                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1518                         rx_pkts[nb_rx]->data_len += (uint16_t)(len[i]);
1519
1520                         if (prev)
1521                                 prev->next = rxm;
1522
1523                         prev = rxm;
1524                         seg_res -= 1;
1525                 }
1526
1527                 if (!seg_res) {
1528                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1529                         nb_rx++;
1530                 }
1531         }
1532
1533         /* Last packet still need merge segments */
1534         while (seg_res != 0) {
1535                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1536                                         VIRTIO_MBUF_BURST_SZ);
1537
1538                 prev = rcv_pkts[nb_rx];
1539                 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1540                         virtio_rmb(hw->weak_barriers);
1541                         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
1542                                                            rcv_cnt);
1543                         uint16_t extra_idx = 0;
1544
1545                         rcv_cnt = num;
1546                         while (extra_idx < rcv_cnt) {
1547                                 rxm = rcv_pkts[extra_idx];
1548                                 rxm->data_off =
1549                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1550                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1551                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1552                                 prev->next = rxm;
1553                                 prev = rxm;
1554                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1555                                 rx_pkts[nb_rx]->data_len += len[extra_idx];
1556                                 extra_idx += 1;
1557                         };
1558                         seg_res -= rcv_cnt;
1559
1560                         if (!seg_res) {
1561                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1562                                 nb_rx++;
1563                         }
1564                 } else {
1565                         PMD_RX_LOG(ERR,
1566                                         "No enough segments for packet.");
1567                         virtio_discard_rxbuf_inorder(vq, prev);
1568                         rxvq->stats.errors++;
1569                         break;
1570                 }
1571         }
1572
1573         rxvq->stats.packets += nb_rx;
1574
1575         /* Allocate new mbuf for the used descriptor */
1576
1577         if (likely(!virtqueue_full(vq))) {
1578                 /* free_cnt may include mrg descs */
1579                 uint16_t free_cnt = vq->vq_free_cnt;
1580                 struct rte_mbuf *new_pkts[free_cnt];
1581
1582                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1583                         error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
1584                                         free_cnt);
1585                         if (unlikely(error)) {
1586                                 for (i = 0; i < free_cnt; i++)
1587                                         rte_pktmbuf_free(new_pkts[i]);
1588                         }
1589                         nb_enqueued += free_cnt;
1590                 } else {
1591                         struct rte_eth_dev *dev =
1592                                 &rte_eth_devices[rxvq->port_id];
1593                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1594                 }
1595         }
1596
1597         if (likely(nb_enqueued)) {
1598                 vq_update_avail_idx(vq);
1599
1600                 if (unlikely(virtqueue_kick_prepare(vq))) {
1601                         virtqueue_notify(vq);
1602                         PMD_RX_LOG(DEBUG, "Notified");
1603                 }
1604         }
1605
1606         return nb_rx;
1607 }
1608
1609 uint16_t
1610 virtio_recv_mergeable_pkts(void *rx_queue,
1611                         struct rte_mbuf **rx_pkts,
1612                         uint16_t nb_pkts)
1613 {
1614         struct virtnet_rx *rxvq = rx_queue;
1615         struct virtqueue *vq = rxvq->vq;
1616         struct virtio_hw *hw = vq->hw;
1617         struct rte_mbuf *rxm;
1618         struct rte_mbuf *prev;
1619         uint16_t nb_used, num, nb_rx = 0;
1620         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1621         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1622         int error;
1623         uint32_t nb_enqueued = 0;
1624         uint32_t seg_num = 0;
1625         uint32_t seg_res = 0;
1626         uint32_t hdr_size = hw->vtnet_hdr_size;
1627         int32_t i;
1628
1629         if (unlikely(hw->started == 0))
1630                 return nb_rx;
1631
1632         nb_used = VIRTQUEUE_NUSED(vq);
1633
1634         virtio_rmb(hw->weak_barriers);
1635
1636         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1637
1638         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
1639         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1640                 num = VIRTIO_MBUF_BURST_SZ;
1641         if (likely(num > DESC_PER_CACHELINE))
1642                 num = num - ((vq->vq_used_cons_idx + num) %
1643                                 DESC_PER_CACHELINE);
1644
1645
1646         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
1647
1648         for (i = 0; i < num; i++) {
1649                 struct virtio_net_hdr_mrg_rxbuf *header;
1650
1651                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1652                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1653
1654                 rxm = rcv_pkts[i];
1655
1656                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
1657                         PMD_RX_LOG(ERR, "Packet drop");
1658                         nb_enqueued++;
1659                         virtio_discard_rxbuf(vq, rxm);
1660                         rxvq->stats.errors++;
1661                         continue;
1662                 }
1663
1664                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1665                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1666                          - hdr_size);
1667                 seg_num = header->num_buffers;
1668                 if (seg_num == 0)
1669                         seg_num = 1;
1670
1671                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1672                 rxm->nb_segs = seg_num;
1673                 rxm->ol_flags = 0;
1674                 rxm->vlan_tci = 0;
1675                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1676                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1677
1678                 rxm->port = rxvq->port_id;
1679
1680                 rx_pkts[nb_rx] = rxm;
1681                 prev = rxm;
1682
1683                 if (hw->has_rx_offload &&
1684                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1685                         virtio_discard_rxbuf(vq, rxm);
1686                         rxvq->stats.errors++;
1687                         continue;
1688                 }
1689
1690                 if (hw->vlan_strip)
1691                         rte_vlan_strip(rx_pkts[nb_rx]);
1692
1693                 seg_res = seg_num - 1;
1694
1695                 /* Merge remaining segments */
1696                 while (seg_res != 0 && i < (num - 1)) {
1697                         i++;
1698
1699                         rxm = rcv_pkts[i];
1700                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1701                         rxm->pkt_len = (uint32_t)(len[i]);
1702                         rxm->data_len = (uint16_t)(len[i]);
1703
1704                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1705                         rx_pkts[nb_rx]->data_len += (uint16_t)(len[i]);
1706
1707                         if (prev)
1708                                 prev->next = rxm;
1709
1710                         prev = rxm;
1711                         seg_res -= 1;
1712                 }
1713
1714                 if (!seg_res) {
1715                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1716                         nb_rx++;
1717                 }
1718         }
1719
1720         /* Last packet still need merge segments */
1721         while (seg_res != 0) {
1722                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1723                                         VIRTIO_MBUF_BURST_SZ);
1724
1725                 prev = rcv_pkts[nb_rx];
1726                 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1727                         virtio_rmb(hw->weak_barriers);
1728                         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len,
1729                                                            rcv_cnt);
1730                         uint16_t extra_idx = 0;
1731
1732                         rcv_cnt = num;
1733                         while (extra_idx < rcv_cnt) {
1734                                 rxm = rcv_pkts[extra_idx];
1735                                 rxm->data_off =
1736                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1737                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1738                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1739                                 prev->next = rxm;
1740                                 prev = rxm;
1741                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1742                                 rx_pkts[nb_rx]->data_len += len[extra_idx];
1743                                 extra_idx += 1;
1744                         };
1745                         seg_res -= rcv_cnt;
1746
1747                         if (!seg_res) {
1748                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1749                                 nb_rx++;
1750                         }
1751                 } else {
1752                         PMD_RX_LOG(ERR,
1753                                         "No enough segments for packet.");
1754                         virtio_discard_rxbuf(vq, prev);
1755                         rxvq->stats.errors++;
1756                         break;
1757                 }
1758         }
1759
1760         rxvq->stats.packets += nb_rx;
1761
1762         /* Allocate new mbuf for the used descriptor */
1763         if (likely(!virtqueue_full(vq))) {
1764                 /* free_cnt may include mrg descs */
1765                 uint16_t free_cnt = vq->vq_free_cnt;
1766                 struct rte_mbuf *new_pkts[free_cnt];
1767
1768                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1769                         error = virtqueue_enqueue_recv_refill(vq, new_pkts,
1770                                         free_cnt);
1771                         if (unlikely(error)) {
1772                                 for (i = 0; i < free_cnt; i++)
1773                                         rte_pktmbuf_free(new_pkts[i]);
1774                         }
1775                         nb_enqueued += free_cnt;
1776                 } else {
1777                         struct rte_eth_dev *dev =
1778                                 &rte_eth_devices[rxvq->port_id];
1779                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1780                 }
1781         }
1782
1783         if (likely(nb_enqueued)) {
1784                 vq_update_avail_idx(vq);
1785
1786                 if (unlikely(virtqueue_kick_prepare(vq))) {
1787                         virtqueue_notify(vq);
1788                         PMD_RX_LOG(DEBUG, "Notified");
1789                 }
1790         }
1791
1792         return nb_rx;
1793 }
1794
1795 uint16_t
1796 virtio_recv_mergeable_pkts_packed(void *rx_queue,
1797                         struct rte_mbuf **rx_pkts,
1798                         uint16_t nb_pkts)
1799 {
1800         struct virtnet_rx *rxvq = rx_queue;
1801         struct virtqueue *vq = rxvq->vq;
1802         struct virtio_hw *hw = vq->hw;
1803         struct rte_mbuf *rxm;
1804         struct rte_mbuf *prev = NULL;
1805         uint16_t num, nb_rx = 0;
1806         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1807         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1808         uint32_t nb_enqueued = 0;
1809         uint32_t seg_num = 0;
1810         uint32_t seg_res = 0;
1811         uint32_t hdr_size = hw->vtnet_hdr_size;
1812         int32_t i;
1813         int error;
1814
1815         if (unlikely(hw->started == 0))
1816                 return nb_rx;
1817
1818
1819         num = nb_pkts;
1820         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
1821                 num = VIRTIO_MBUF_BURST_SZ;
1822         if (likely(num > DESC_PER_CACHELINE))
1823                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
1824
1825         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts, len, num);
1826
1827         for (i = 0; i < num; i++) {
1828                 struct virtio_net_hdr_mrg_rxbuf *header;
1829
1830                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1831                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1832
1833                 rxm = rcv_pkts[i];
1834
1835                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
1836                         PMD_RX_LOG(ERR, "Packet drop");
1837                         nb_enqueued++;
1838                         virtio_discard_rxbuf(vq, rxm);
1839                         rxvq->stats.errors++;
1840                         continue;
1841                 }
1842
1843                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)
1844                           rxm->buf_addr + RTE_PKTMBUF_HEADROOM - hdr_size);
1845                 seg_num = header->num_buffers;
1846
1847                 if (seg_num == 0)
1848                         seg_num = 1;
1849
1850                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1851                 rxm->nb_segs = seg_num;
1852                 rxm->ol_flags = 0;
1853                 rxm->vlan_tci = 0;
1854                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1855                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1856
1857                 rxm->port = rxvq->port_id;
1858                 rx_pkts[nb_rx] = rxm;
1859                 prev = rxm;
1860
1861                 if (hw->has_rx_offload &&
1862                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1863                         virtio_discard_rxbuf(vq, rxm);
1864                         rxvq->stats.errors++;
1865                         continue;
1866                 }
1867
1868                 if (hw->vlan_strip)
1869                         rte_vlan_strip(rx_pkts[nb_rx]);
1870
1871                 seg_res = seg_num - 1;
1872
1873                 /* Merge remaining segments */
1874                 while (seg_res != 0 && i < (num - 1)) {
1875                         i++;
1876
1877                         rxm = rcv_pkts[i];
1878                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1879                         rxm->pkt_len = (uint32_t)(len[i]);
1880                         rxm->data_len = (uint16_t)(len[i]);
1881
1882                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1883                         rx_pkts[nb_rx]->data_len += (uint16_t)(len[i]);
1884
1885                         if (prev)
1886                                 prev->next = rxm;
1887
1888                         prev = rxm;
1889                         seg_res -= 1;
1890                 }
1891
1892                 if (!seg_res) {
1893                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1894                         nb_rx++;
1895                 }
1896         }
1897
1898         /* Last packet still need merge segments */
1899         while (seg_res != 0) {
1900                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1901                                         VIRTIO_MBUF_BURST_SZ);
1902                 if (likely(vq->vq_free_cnt >= rcv_cnt)) {
1903                         num = virtqueue_dequeue_burst_rx_packed(vq, rcv_pkts,
1904                                         len, rcv_cnt);
1905                         uint16_t extra_idx = 0;
1906
1907                         rcv_cnt = num;
1908
1909                         while (extra_idx < rcv_cnt) {
1910                                 rxm = rcv_pkts[extra_idx];
1911
1912                                 rxm->data_off =
1913                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1914                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1915                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1916
1917                                 prev->next = rxm;
1918                                 prev = rxm;
1919                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1920                                 rx_pkts[nb_rx]->data_len += len[extra_idx];
1921                                 extra_idx += 1;
1922                         }
1923                         seg_res -= rcv_cnt;
1924                         if (!seg_res) {
1925                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1926                                 nb_rx++;
1927                         }
1928                 } else {
1929                         PMD_RX_LOG(ERR,
1930                                         "No enough segments for packet.");
1931                         if (prev)
1932                                 virtio_discard_rxbuf(vq, prev);
1933                         rxvq->stats.errors++;
1934                         break;
1935                 }
1936         }
1937
1938         rxvq->stats.packets += nb_rx;
1939
1940         /* Allocate new mbuf for the used descriptor */
1941         if (likely(!virtqueue_full(vq))) {
1942                 /* free_cnt may include mrg descs */
1943                 uint16_t free_cnt = vq->vq_free_cnt;
1944                 struct rte_mbuf *new_pkts[free_cnt];
1945
1946                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1947                         error = virtqueue_enqueue_recv_refill_packed(vq,
1948                                         new_pkts, free_cnt);
1949                         if (unlikely(error)) {
1950                                 for (i = 0; i < free_cnt; i++)
1951                                         rte_pktmbuf_free(new_pkts[i]);
1952                         }
1953                         nb_enqueued += free_cnt;
1954                 } else {
1955                         struct rte_eth_dev *dev =
1956                                 &rte_eth_devices[rxvq->port_id];
1957                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1958                 }
1959         }
1960
1961         if (likely(nb_enqueued)) {
1962                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
1963                         virtqueue_notify(vq);
1964                         PMD_RX_LOG(DEBUG, "Notified");
1965                 }
1966         }
1967
1968         return nb_rx;
1969 }
1970
1971 uint16_t
1972 virtio_xmit_pkts_packed(void *tx_queue, struct rte_mbuf **tx_pkts,
1973                         uint16_t nb_pkts)
1974 {
1975         struct virtnet_tx *txvq = tx_queue;
1976         struct virtqueue *vq = txvq->vq;
1977         struct virtio_hw *hw = vq->hw;
1978         uint16_t hdr_size = hw->vtnet_hdr_size;
1979         uint16_t nb_tx = 0;
1980         bool in_order = hw->use_inorder_tx;
1981         int error;
1982
1983         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1984                 return nb_tx;
1985
1986         if (unlikely(nb_pkts < 1))
1987                 return nb_pkts;
1988
1989         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1990
1991         if (nb_pkts > vq->vq_free_cnt)
1992                 virtio_xmit_cleanup_packed(vq, nb_pkts - vq->vq_free_cnt,
1993                                            in_order);
1994
1995         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1996                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1997                 int can_push = 0, slots, need;
1998
1999                 /* Do VLAN tag insertion */
2000                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
2001                         error = rte_vlan_insert(&txm);
2002                         if (unlikely(error)) {
2003                                 rte_pktmbuf_free(txm);
2004                                 continue;
2005                         }
2006                         /* vlan_insert may add a header mbuf */
2007                         tx_pkts[nb_tx] = txm;
2008                 }
2009
2010                 /* optimize ring usage */
2011                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2012                       vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2013                     rte_mbuf_refcnt_read(txm) == 1 &&
2014                     RTE_MBUF_DIRECT(txm) &&
2015                     txm->nb_segs == 1 &&
2016                     rte_pktmbuf_headroom(txm) >= hdr_size &&
2017                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2018                            __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
2019                         can_push = 1;
2020
2021                 /* How many main ring entries are needed to this Tx?
2022                  * any_layout => number of segments
2023                  * default    => number of segments + 1
2024                  */
2025                 slots = txm->nb_segs + !can_push;
2026                 need = slots - vq->vq_free_cnt;
2027
2028                 /* Positive value indicates it need free vring descriptors */
2029                 if (unlikely(need > 0)) {
2030                         virtio_xmit_cleanup_packed(vq, need, in_order);
2031                         need = slots - vq->vq_free_cnt;
2032                         if (unlikely(need > 0)) {
2033                                 PMD_TX_LOG(ERR,
2034                                            "No free tx descriptors to transmit");
2035                                 break;
2036                         }
2037                 }
2038
2039                 /* Enqueue Packet buffers */
2040                 if (can_push)
2041                         virtqueue_enqueue_xmit_packed_fast(txvq, txm, in_order);
2042                 else
2043                         virtqueue_enqueue_xmit_packed(txvq, txm, slots, 0,
2044                                                       in_order);
2045
2046                 virtio_update_packet_stats(&txvq->stats, txm);
2047         }
2048
2049         txvq->stats.packets += nb_tx;
2050
2051         if (likely(nb_tx)) {
2052                 if (unlikely(virtqueue_kick_prepare_packed(vq))) {
2053                         virtqueue_notify(vq);
2054                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2055                 }
2056         }
2057
2058         return nb_tx;
2059 }
2060
2061 uint16_t
2062 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
2063 {
2064         struct virtnet_tx *txvq = tx_queue;
2065         struct virtqueue *vq = txvq->vq;
2066         struct virtio_hw *hw = vq->hw;
2067         uint16_t hdr_size = hw->vtnet_hdr_size;
2068         uint16_t nb_used, nb_tx = 0;
2069         int error;
2070
2071         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2072                 return nb_tx;
2073
2074         if (unlikely(nb_pkts < 1))
2075                 return nb_pkts;
2076
2077         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2078         nb_used = VIRTQUEUE_NUSED(vq);
2079
2080         virtio_rmb(hw->weak_barriers);
2081         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
2082                 virtio_xmit_cleanup(vq, nb_used);
2083
2084         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
2085                 struct rte_mbuf *txm = tx_pkts[nb_tx];
2086                 int can_push = 0, use_indirect = 0, slots, need;
2087
2088                 /* Do VLAN tag insertion */
2089                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
2090                         error = rte_vlan_insert(&txm);
2091                         if (unlikely(error)) {
2092                                 rte_pktmbuf_free(txm);
2093                                 continue;
2094                         }
2095                         /* vlan_insert may add a header mbuf */
2096                         tx_pkts[nb_tx] = txm;
2097                 }
2098
2099                 /* optimize ring usage */
2100                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2101                       vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2102                     rte_mbuf_refcnt_read(txm) == 1 &&
2103                     RTE_MBUF_DIRECT(txm) &&
2104                     txm->nb_segs == 1 &&
2105                     rte_pktmbuf_headroom(txm) >= hdr_size &&
2106                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2107                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
2108                         can_push = 1;
2109                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
2110                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
2111                         use_indirect = 1;
2112
2113                 /* How many main ring entries are needed to this Tx?
2114                  * any_layout => number of segments
2115                  * indirect   => 1
2116                  * default    => number of segments + 1
2117                  */
2118                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
2119                 need = slots - vq->vq_free_cnt;
2120
2121                 /* Positive value indicates it need free vring descriptors */
2122                 if (unlikely(need > 0)) {
2123                         nb_used = VIRTQUEUE_NUSED(vq);
2124                         virtio_rmb(hw->weak_barriers);
2125                         need = RTE_MIN(need, (int)nb_used);
2126
2127                         virtio_xmit_cleanup(vq, need);
2128                         need = slots - vq->vq_free_cnt;
2129                         if (unlikely(need > 0)) {
2130                                 PMD_TX_LOG(ERR,
2131                                            "No free tx descriptors to transmit");
2132                                 break;
2133                         }
2134                 }
2135
2136                 /* Enqueue Packet buffers */
2137                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
2138                         can_push, 0);
2139
2140                 virtio_update_packet_stats(&txvq->stats, txm);
2141         }
2142
2143         txvq->stats.packets += nb_tx;
2144
2145         if (likely(nb_tx)) {
2146                 vq_update_avail_idx(vq);
2147
2148                 if (unlikely(virtqueue_kick_prepare(vq))) {
2149                         virtqueue_notify(vq);
2150                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2151                 }
2152         }
2153
2154         return nb_tx;
2155 }
2156
2157 uint16_t
2158 virtio_xmit_pkts_inorder(void *tx_queue,
2159                         struct rte_mbuf **tx_pkts,
2160                         uint16_t nb_pkts)
2161 {
2162         struct virtnet_tx *txvq = tx_queue;
2163         struct virtqueue *vq = txvq->vq;
2164         struct virtio_hw *hw = vq->hw;
2165         uint16_t hdr_size = hw->vtnet_hdr_size;
2166         uint16_t nb_used, nb_avail, nb_tx = 0, nb_inorder_pkts = 0;
2167         struct rte_mbuf *inorder_pkts[nb_pkts];
2168         int error;
2169
2170         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
2171                 return nb_tx;
2172
2173         if (unlikely(nb_pkts < 1))
2174                 return nb_pkts;
2175
2176         VIRTQUEUE_DUMP(vq);
2177         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
2178         nb_used = VIRTQUEUE_NUSED(vq);
2179
2180         virtio_rmb(hw->weak_barriers);
2181         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
2182                 virtio_xmit_cleanup_inorder(vq, nb_used);
2183
2184         if (unlikely(!vq->vq_free_cnt))
2185                 virtio_xmit_cleanup_inorder(vq, nb_used);
2186
2187         nb_avail = RTE_MIN(vq->vq_free_cnt, nb_pkts);
2188
2189         for (nb_tx = 0; nb_tx < nb_avail; nb_tx++) {
2190                 struct rte_mbuf *txm = tx_pkts[nb_tx];
2191                 int slots, need;
2192
2193                 /* Do VLAN tag insertion */
2194                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
2195                         error = rte_vlan_insert(&txm);
2196                         if (unlikely(error)) {
2197                                 rte_pktmbuf_free(txm);
2198                                 continue;
2199                         }
2200                         /* vlan_insert may add a header mbuf */
2201                         tx_pkts[nb_tx] = txm;
2202                 }
2203
2204                 /* optimize ring usage */
2205                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
2206                      vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
2207                      rte_mbuf_refcnt_read(txm) == 1 &&
2208                      RTE_MBUF_DIRECT(txm) &&
2209                      txm->nb_segs == 1 &&
2210                      rte_pktmbuf_headroom(txm) >= hdr_size &&
2211                      rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
2212                                 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
2213                         inorder_pkts[nb_inorder_pkts] = txm;
2214                         nb_inorder_pkts++;
2215
2216                         virtio_update_packet_stats(&txvq->stats, txm);
2217                         continue;
2218                 }
2219
2220                 if (nb_inorder_pkts) {
2221                         virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2222                                                         nb_inorder_pkts);
2223                         nb_inorder_pkts = 0;
2224                 }
2225
2226                 slots = txm->nb_segs + 1;
2227                 need = slots - vq->vq_free_cnt;
2228                 if (unlikely(need > 0)) {
2229                         nb_used = VIRTQUEUE_NUSED(vq);
2230                         virtio_rmb(hw->weak_barriers);
2231                         need = RTE_MIN(need, (int)nb_used);
2232
2233                         virtio_xmit_cleanup_inorder(vq, need);
2234
2235                         need = slots - vq->vq_free_cnt;
2236
2237                         if (unlikely(need > 0)) {
2238                                 PMD_TX_LOG(ERR,
2239                                         "No free tx descriptors to transmit");
2240                                 break;
2241                         }
2242                 }
2243                 /* Enqueue Packet buffers */
2244                 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
2245
2246                 virtio_update_packet_stats(&txvq->stats, txm);
2247         }
2248
2249         /* Transmit all inorder packets */
2250         if (nb_inorder_pkts)
2251                 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
2252                                                 nb_inorder_pkts);
2253
2254         txvq->stats.packets += nb_tx;
2255
2256         if (likely(nb_tx)) {
2257                 vq_update_avail_idx(vq);
2258
2259                 if (unlikely(virtqueue_kick_prepare(vq))) {
2260                         virtqueue_notify(vq);
2261                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
2262                 }
2263         }
2264
2265         VIRTQUEUE_DUMP(vq);
2266
2267         return nb_tx;
2268 }