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
  35 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
  36 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
  37 #else
  38 #define  VIRTIO_DUMP_PACKET(m, len) do { } while (0)
  39 #endif
  40
  41 int
  42 virtio_dev_rx_queue_done(void *rxq, uint16_t offset)
  43 {
  44         struct virtnet_rx *rxvq = rxq;
  45         struct virtqueue *vq = rxvq->vq;
  46
  47         return VIRTQUEUE_NUSED(vq) >= offset;
  48 }
  49
  50 void
  51 vq_ring_free_inorder(struct virtqueue *vq, uint16_t desc_idx, uint16_t num)
  52 {
  53         vq->vq_free_cnt += num;
  54         vq->vq_desc_tail_idx = desc_idx & (vq->vq_nentries - 1);
  55 }
  56
  57 void
  58 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
  59 {
  60         struct vring_desc *dp, *dp_tail;
  61         struct vq_desc_extra *dxp;
  62         uint16_t desc_idx_last = desc_idx;
  63
  64         dp  = &vq->vq_ring.desc[desc_idx];
  65         dxp = &vq->vq_descx[desc_idx];
  66         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
  67         if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
  68                 while (dp->flags & VRING_DESC_F_NEXT) {
  69                         desc_idx_last = dp->next;
  70                         dp = &vq->vq_ring.desc[dp->next];
  71                 }
  72         }
  73         dxp->ndescs = 0;
  74
  75         /*
  76          * We must append the existing free chain, if any, to the end of
  77          * newly freed chain. If the virtqueue was completely used, then
  78          * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
  79          */
  80         if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
  81                 vq->vq_desc_head_idx = desc_idx;
  82         } else {
  83                 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
  84                 dp_tail->next = desc_idx;
  85         }
  86
  87         vq->vq_desc_tail_idx = desc_idx_last;
  88         dp->next = VQ_RING_DESC_CHAIN_END;
  89 }
  90
  91 static uint16_t
  92 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
  93                            uint32_t *len, uint16_t num)
  94 {
  95         struct vring_used_elem *uep;
  96         struct rte_mbuf *cookie;
  97         uint16_t used_idx, desc_idx;
  98         uint16_t i;
  99
 100         /*  Caller does the check */
 101         for (i = 0; i < num ; i++) {
 102                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
 103                 uep = &vq->vq_ring.used->ring[used_idx];
 104                 desc_idx = (uint16_t) uep->id;
 105                 len[i] = uep->len;
 106                 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
 107
 108                 if (unlikely(cookie == NULL)) {
 109                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 110                                 vq->vq_used_cons_idx);
 111                         break;
 112                 }
 113
 114                 rte_prefetch0(cookie);
 115                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 116                 rx_pkts[i]  = cookie;
 117                 vq->vq_used_cons_idx++;
 118                 vq_ring_free_chain(vq, desc_idx);
 119                 vq->vq_descx[desc_idx].cookie = NULL;
 120         }
 121
 122         return i;
 123 }
 124
 125 static uint16_t
 126 virtqueue_dequeue_rx_inorder(struct virtqueue *vq,
 127                         struct rte_mbuf **rx_pkts,
 128                         uint32_t *len,
 129                         uint16_t num)
 130 {
 131         struct vring_used_elem *uep;
 132         struct rte_mbuf *cookie;
 133         uint16_t used_idx = 0;
 134         uint16_t i;
 135
 136         if (unlikely(num == 0))
 137                 return 0;
 138
 139         for (i = 0; i < num; i++) {
 140                 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
 141                 /* Desc idx same as used idx */
 142                 uep = &vq->vq_ring.used->ring[used_idx];
 143                 len[i] = uep->len;
 144                 cookie = (struct rte_mbuf *)vq->vq_descx[used_idx].cookie;
 145
 146                 if (unlikely(cookie == NULL)) {
 147                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u",
 148                                 vq->vq_used_cons_idx);
 149                         break;
 150                 }
 151
 152                 rte_prefetch0(cookie);
 153                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 154                 rx_pkts[i]  = cookie;
 155                 vq->vq_used_cons_idx++;
 156                 vq->vq_descx[used_idx].cookie = NULL;
 157         }
 158
 159         vq_ring_free_inorder(vq, used_idx, i);
 160         return i;
 161 }
 162
 163 #ifndef DEFAULT_TX_FREE_THRESH
 164 #define DEFAULT_TX_FREE_THRESH 32
 165 #endif
 166
 167 /* Cleanup from completed transmits. */
 168 static void
 169 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
 170 {
 171         uint16_t i, used_idx, desc_idx;
 172         for (i = 0; i < num; i++) {
 173                 struct vring_used_elem *uep;
 174                 struct vq_desc_extra *dxp;
 175
 176                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
 177                 uep = &vq->vq_ring.used->ring[used_idx];
 178
 179                 desc_idx = (uint16_t) uep->id;
 180                 dxp = &vq->vq_descx[desc_idx];
 181                 vq->vq_used_cons_idx++;
 182                 vq_ring_free_chain(vq, desc_idx);
 183
 184                 if (dxp->cookie != NULL) {
 185                         rte_pktmbuf_free(dxp->cookie);
 186                         dxp->cookie = NULL;
 187                 }
 188         }
 189 }
 190
 191 /* Cleanup from completed inorder transmits. */
 192 static void
 193 virtio_xmit_cleanup_inorder(struct virtqueue *vq, uint16_t num)
 194 {
 195         uint16_t i, idx = vq->vq_used_cons_idx;
 196         int16_t free_cnt = 0;
 197         struct vq_desc_extra *dxp = NULL;
 198
 199         if (unlikely(num == 0))
 200                 return;
 201
 202         for (i = 0; i < num; i++) {
 203                 dxp = &vq->vq_descx[idx++ & (vq->vq_nentries - 1)];
 204                 free_cnt += dxp->ndescs;
 205                 if (dxp->cookie != NULL) {
 206                         rte_pktmbuf_free(dxp->cookie);
 207                         dxp->cookie = NULL;
 208                 }
 209         }
 210
 211         vq->vq_free_cnt += free_cnt;
 212         vq->vq_used_cons_idx = idx;
 213 }
 214
 215 static inline int
 216 virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
 217                         struct rte_mbuf **cookies,
 218                         uint16_t num)
 219 {
 220         struct vq_desc_extra *dxp;
 221         struct virtio_hw *hw = vq->hw;
 222         struct vring_desc *start_dp;
 223         uint16_t head_idx, idx, i = 0;
 224
 225         if (unlikely(vq->vq_free_cnt == 0))
 226                 return -ENOSPC;
 227         if (unlikely(vq->vq_free_cnt < num))
 228                 return -EMSGSIZE;
 229
 230         head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
 231         start_dp = vq->vq_ring.desc;
 232
 233         while (i < num) {
 234                 idx = head_idx & (vq->vq_nentries - 1);
 235                 dxp = &vq->vq_descx[idx];
 236                 dxp->cookie = (void *)cookies[i];
 237                 dxp->ndescs = 1;
 238
 239                 start_dp[idx].addr =
 240                                 VIRTIO_MBUF_ADDR(cookies[i], vq) +
 241                                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 242                 start_dp[idx].len =
 243                                 cookies[i]->buf_len -
 244                                 RTE_PKTMBUF_HEADROOM +
 245                                 hw->vtnet_hdr_size;
 246                 start_dp[idx].flags =  VRING_DESC_F_WRITE;
 247
 248                 vq_update_avail_ring(vq, idx);
 249                 head_idx++;
 250                 i++;
 251         }
 252
 253         vq->vq_desc_head_idx += num;
 254         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 255         return 0;
 256 }
 257
 258 static inline int
 259 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
 260 {
 261         struct vq_desc_extra *dxp;
 262         struct virtio_hw *hw = vq->hw;
 263         struct vring_desc *start_dp;
 264         uint16_t needed = 1;
 265         uint16_t head_idx, idx;
 266
 267         if (unlikely(vq->vq_free_cnt == 0))
 268                 return -ENOSPC;
 269         if (unlikely(vq->vq_free_cnt < needed))
 270                 return -EMSGSIZE;
 271
 272         head_idx = vq->vq_desc_head_idx;
 273         if (unlikely(head_idx >= vq->vq_nentries))
 274                 return -EFAULT;
 275
 276         idx = head_idx;
 277         dxp = &vq->vq_descx[idx];
 278         dxp->cookie = (void *)cookie;
 279         dxp->ndescs = needed;
 280
 281         start_dp = vq->vq_ring.desc;
 282         start_dp[idx].addr =
 283                 VIRTIO_MBUF_ADDR(cookie, vq) +
 284                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 285         start_dp[idx].len =
 286                 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
 287         start_dp[idx].flags =  VRING_DESC_F_WRITE;
 288         idx = start_dp[idx].next;
 289         vq->vq_desc_head_idx = idx;
 290         if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 291                 vq->vq_desc_tail_idx = idx;
 292         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 293         vq_update_avail_ring(vq, head_idx);
 294
 295         return 0;
 296 }
 297
 298 /* When doing TSO, the IP length is not included in the pseudo header
 299  * checksum of the packet given to the PMD, but for virtio it is
 300  * expected.
 301  */
 302 static void
 303 virtio_tso_fix_cksum(struct rte_mbuf *m)
 304 {
 305         /* common case: header is not fragmented */
 306         if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
 307                         m->l4_len)) {
 308                 struct ipv4_hdr *iph;
 309                 struct ipv6_hdr *ip6h;
 310                 struct tcp_hdr *th;
 311                 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
 312                 uint32_t tmp;
 313
 314                 iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
 315                 th = RTE_PTR_ADD(iph, m->l3_len);
 316                 if ((iph->version_ihl >> 4) == 4) {
 317                         iph->hdr_checksum = 0;
 318                         iph->hdr_checksum = rte_ipv4_cksum(iph);
 319                         ip_len = iph->total_length;
 320                         ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
 321                                 m->l3_len);
 322                 } else {
 323                         ip6h = (struct ipv6_hdr *)iph;
 324                         ip_paylen = ip6h->payload_len;
 325                 }
 326
 327                 /* calculate the new phdr checksum not including ip_paylen */
 328                 prev_cksum = th->cksum;
 329                 tmp = prev_cksum;
 330                 tmp += ip_paylen;
 331                 tmp = (tmp & 0xffff) + (tmp >> 16);
 332                 new_cksum = tmp;
 333
 334                 /* replace it in the packet */
 335                 th->cksum = new_cksum;
 336         }
 337 }
 338
 339
 340 /* avoid write operation when necessary, to lessen cache issues */
 341 #define ASSIGN_UNLESS_EQUAL(var, val) do {      \
 342         if ((var) != (val))                     \
 343                 (var) = (val);                  \
 344 } while (0)
 345
 346 static inline void
 347 virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
 348                         struct rte_mbuf *cookie,
 349                         bool offload)
 350 {
 351         if (offload) {
 352                 if (cookie->ol_flags & PKT_TX_TCP_SEG)
 353                         cookie->ol_flags |= PKT_TX_TCP_CKSUM;
 354
 355                 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
 356                 case PKT_TX_UDP_CKSUM:
 357                         hdr->csum_start = cookie->l2_len + cookie->l3_len;
 358                         hdr->csum_offset = offsetof(struct udp_hdr,
 359                                 dgram_cksum);
 360                         hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 361                         break;
 362
 363                 case PKT_TX_TCP_CKSUM:
 364                         hdr->csum_start = cookie->l2_len + cookie->l3_len;
 365                         hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
 366                         hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 367                         break;
 368
 369                 default:
 370                         ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
 371                         ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
 372                         ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
 373                         break;
 374                 }
 375
 376                 /* TCP Segmentation Offload */
 377                 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
 378                         virtio_tso_fix_cksum(cookie);
 379                         hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
 380                                 VIRTIO_NET_HDR_GSO_TCPV6 :
 381                                 VIRTIO_NET_HDR_GSO_TCPV4;
 382                         hdr->gso_size = cookie->tso_segsz;
 383                         hdr->hdr_len =
 384                                 cookie->l2_len +
 385                                 cookie->l3_len +
 386                                 cookie->l4_len;
 387                 } else {
 388                         ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
 389                         ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
 390                         ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
 391                 }
 392         }
 393 }
 394
 395 static inline void
 396 virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
 397                         struct rte_mbuf **cookies,
 398                         uint16_t num)
 399 {
 400         struct vq_desc_extra *dxp;
 401         struct virtqueue *vq = txvq->vq;
 402         struct vring_desc *start_dp;
 403         struct virtio_net_hdr *hdr;
 404         uint16_t idx;
 405         uint16_t head_size = vq->hw->vtnet_hdr_size;
 406         uint16_t i = 0;
 407
 408         idx = vq->vq_desc_head_idx;
 409         start_dp = vq->vq_ring.desc;
 410
 411         while (i < num) {
 412                 idx = idx & (vq->vq_nentries - 1);
 413                 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
 414                 dxp->cookie = (void *)cookies[i];
 415                 dxp->ndescs = 1;
 416
 417                 hdr = (struct virtio_net_hdr *)
 418                         rte_pktmbuf_prepend(cookies[i], head_size);
 419                 cookies[i]->pkt_len -= head_size;
 420
 421                 /* if offload disabled, it is not zeroed below, do it now */
 422                 if (!vq->hw->has_tx_offload) {
 423                         ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
 424                         ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
 425                         ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
 426                         ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
 427                         ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
 428                         ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
 429                 }
 430
 431                 virtqueue_xmit_offload(hdr, cookies[i],
 432                                 vq->hw->has_tx_offload);
 433
 434                 start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq);
 435                 start_dp[idx].len   = cookies[i]->data_len;
 436                 start_dp[idx].flags = 0;
 437
 438                 vq_update_avail_ring(vq, idx);
 439
 440                 idx++;
 441                 i++;
 442         };
 443
 444         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 445         vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
 446 }
 447
 448 static inline void
 449 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 450                         uint16_t needed, int use_indirect, int can_push,
 451                         int in_order)
 452 {
 453         struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 454         struct vq_desc_extra *dxp;
 455         struct virtqueue *vq = txvq->vq;
 456         struct vring_desc *start_dp;
 457         uint16_t seg_num = cookie->nb_segs;
 458         uint16_t head_idx, idx;
 459         uint16_t head_size = vq->hw->vtnet_hdr_size;
 460         struct virtio_net_hdr *hdr;
 461
 462         head_idx = vq->vq_desc_head_idx;
 463         idx = head_idx;
 464         if (in_order)
 465                 dxp = &vq->vq_descx[vq->vq_avail_idx & (vq->vq_nentries - 1)];
 466         else
 467                 dxp = &vq->vq_descx[idx];
 468         dxp->cookie = (void *)cookie;
 469         dxp->ndescs = needed;
 470
 471         start_dp = vq->vq_ring.desc;
 472
 473         if (can_push) {
 474                 /* prepend cannot fail, checked by caller */
 475                 hdr = (struct virtio_net_hdr *)
 476                         rte_pktmbuf_prepend(cookie, head_size);
 477                 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
 478                  * which is wrong. Below subtract restores correct pkt size.
 479                  */
 480                 cookie->pkt_len -= head_size;
 481
 482                 /* if offload disabled, it is not zeroed below, do it now */
 483                 if (!vq->hw->has_tx_offload) {
 484                         ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
 485                         ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
 486                         ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
 487                         ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
 488                         ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
 489                         ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
 490                 }
 491         } else if (use_indirect) {
 492                 /* setup tx ring slot to point to indirect
 493                  * descriptor list stored in reserved region.
 494                  *
 495                  * the first slot in indirect ring is already preset
 496                  * to point to the header in reserved region
 497                  */
 498                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 499                         RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
 500                 start_dp[idx].len   = (seg_num + 1) * sizeof(struct vring_desc);
 501                 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
 502                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 503
 504                 /* loop below will fill in rest of the indirect elements */
 505                 start_dp = txr[idx].tx_indir;
 506                 idx = 1;
 507         } else {
 508                 /* setup first tx ring slot to point to header
 509                  * stored in reserved region.
 510                  */
 511                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 512                         RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
 513                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
 514                 start_dp[idx].flags = VRING_DESC_F_NEXT;
 515                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 516
 517                 idx = start_dp[idx].next;
 518         }
 519
 520         virtqueue_xmit_offload(hdr, cookie, vq->hw->has_tx_offload);
 521
 522         do {
 523                 start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 524                 start_dp[idx].len   = cookie->data_len;
 525                 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 526                 idx = start_dp[idx].next;
 527         } while ((cookie = cookie->next) != NULL);
 528
 529         if (use_indirect)
 530                 idx = vq->vq_ring.desc[head_idx].next;
 531
 532         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 533
 534         vq->vq_desc_head_idx = idx;
 535         vq_update_avail_ring(vq, head_idx);
 536
 537         if (!in_order) {
 538                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 539                         vq->vq_desc_tail_idx = idx;
 540         }
 541 }
 542
 543 void
 544 virtio_dev_cq_start(struct rte_eth_dev *dev)
 545 {
 546         struct virtio_hw *hw = dev->data->dev_private;
 547
 548         if (hw->cvq && hw->cvq->vq) {
 549                 rte_spinlock_init(&hw->cvq->lock);
 550                 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
 551         }
 552 }
 553
 554 int
 555 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
 556                         uint16_t queue_idx,
 557                         uint16_t nb_desc,
 558                         unsigned int socket_id __rte_unused,
 559                         const struct rte_eth_rxconf *rx_conf __rte_unused,
 560                         struct rte_mempool *mp)
 561 {
 562         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 563         struct virtio_hw *hw = dev->data->dev_private;
 564         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 565         struct virtnet_rx *rxvq;
 566
 567         PMD_INIT_FUNC_TRACE();
 568
 569         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
 570                 nb_desc = vq->vq_nentries;
 571         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 572
 573         rxvq = &vq->rxq;
 574         rxvq->queue_id = queue_idx;
 575         rxvq->mpool = mp;
 576         if (rxvq->mpool == NULL) {
 577                 rte_exit(EXIT_FAILURE,
 578                         "Cannot allocate mbufs for rx virtqueue");
 579         }
 580
 581         dev->data->rx_queues[queue_idx] = rxvq;
 582
 583         return 0;
 584 }
 585
 586 int
 587 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
 588 {
 589         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 590         struct virtio_hw *hw = dev->data->dev_private;
 591         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 592         struct virtnet_rx *rxvq = &vq->rxq;
 593         struct rte_mbuf *m;
 594         uint16_t desc_idx;
 595         int error, nbufs, i;
 596
 597         PMD_INIT_FUNC_TRACE();
 598
 599         /* Allocate blank mbufs for the each rx descriptor */
 600         nbufs = 0;
 601
 602         if (hw->use_simple_rx) {
 603                 for (desc_idx = 0; desc_idx < vq->vq_nentries;
 604                      desc_idx++) {
 605                         vq->vq_ring.avail->ring[desc_idx] = desc_idx;
 606                         vq->vq_ring.desc[desc_idx].flags =
 607                                 VRING_DESC_F_WRITE;
 608                 }
 609
 610                 virtio_rxq_vec_setup(rxvq);
 611         }
 612
 613         memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
 614         for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
 615              desc_idx++) {
 616                 vq->sw_ring[vq->vq_nentries + desc_idx] =
 617                         &rxvq->fake_mbuf;
 618         }
 619
 620         if (hw->use_simple_rx) {
 621                 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
 622                         virtio_rxq_rearm_vec(rxvq);
 623                         nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
 624                 }
 625         } else if (hw->use_inorder_rx) {
 626                 if ((!virtqueue_full(vq))) {
 627                         uint16_t free_cnt = vq->vq_free_cnt;
 628                         struct rte_mbuf *pkts[free_cnt];
 629
 630                         if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
 631                                 free_cnt)) {
 632                                 error = virtqueue_enqueue_refill_inorder(vq,
 633                                                 pkts,
 634                                                 free_cnt);
 635                                 if (unlikely(error)) {
 636                                         for (i = 0; i < free_cnt; i++)
 637                                                 rte_pktmbuf_free(pkts[i]);
 638                                 }
 639                         }
 640
 641                         nbufs += free_cnt;
 642                         vq_update_avail_idx(vq);
 643                 }
 644         } else {
 645                 while (!virtqueue_full(vq)) {
 646                         m = rte_mbuf_raw_alloc(rxvq->mpool);
 647                         if (m == NULL)
 648                                 break;
 649
 650                         /* Enqueue allocated buffers */
 651                         error = virtqueue_enqueue_recv_refill(vq, m);
 652                         if (error) {
 653                                 rte_pktmbuf_free(m);
 654                                 break;
 655                         }
 656                         nbufs++;
 657                 }
 658
 659                 vq_update_avail_idx(vq);
 660         }
 661
 662         PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
 663
 664         VIRTQUEUE_DUMP(vq);
 665
 666         return 0;
 667 }
 668
 669 /*
 670  * struct rte_eth_dev *dev: Used to update dev
 671  * uint16_t nb_desc: Defaults to values read from config space
 672  * unsigned int socket_id: Used to allocate memzone
 673  * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
 674  * uint16_t queue_idx: Just used as an index in dev txq list
 675  */
 676 int
 677 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 678                         uint16_t queue_idx,
 679                         uint16_t nb_desc,
 680                         unsigned int socket_id __rte_unused,
 681                         const struct rte_eth_txconf *tx_conf)
 682 {
 683         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 684         struct virtio_hw *hw = dev->data->dev_private;
 685         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 686         struct virtnet_tx *txvq;
 687         uint16_t tx_free_thresh;
 688
 689         PMD_INIT_FUNC_TRACE();
 690
 691         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
 692                 nb_desc = vq->vq_nentries;
 693         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 694
 695         txvq = &vq->txq;
 696         txvq->queue_id = queue_idx;
 697
 698         tx_free_thresh = tx_conf->tx_free_thresh;
 699         if (tx_free_thresh == 0)
 700                 tx_free_thresh =
 701                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
 702
 703         if (tx_free_thresh >= (vq->vq_nentries - 3)) {
 704                 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
 705                         "number of TX entries minus 3 (%u)."
 706                         " (tx_free_thresh=%u port=%u queue=%u)\n",
 707                         vq->vq_nentries - 3,
 708                         tx_free_thresh, dev->data->port_id, queue_idx);
 709                 return -EINVAL;
 710         }
 711
 712         vq->vq_free_thresh = tx_free_thresh;
 713
 714         dev->data->tx_queues[queue_idx] = txvq;
 715         return 0;
 716 }
 717
 718 int
 719 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
 720                                 uint16_t queue_idx)
 721 {
 722         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 723         struct virtio_hw *hw = dev->data->dev_private;
 724         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 725
 726         PMD_INIT_FUNC_TRACE();
 727
 728         if (hw->use_inorder_tx)
 729                 vq->vq_ring.desc[vq->vq_nentries - 1].next = 0;
 730
 731         VIRTQUEUE_DUMP(vq);
 732
 733         return 0;
 734 }
 735
 736 static void
 737 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
 738 {
 739         int error;
 740         /*
 741          * Requeue the discarded mbuf. This should always be
 742          * successful since it was just dequeued.
 743          */
 744         error = virtqueue_enqueue_recv_refill(vq, m);
 745
 746         if (unlikely(error)) {
 747                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
 748                 rte_pktmbuf_free(m);
 749         }
 750 }
 751
 752 static void
 753 virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
 754 {
 755         int error;
 756
 757         error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
 758         if (unlikely(error)) {
 759                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
 760                 rte_pktmbuf_free(m);
 761         }
 762 }
 763
 764 static void
 765 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
 766 {
 767         uint32_t s = mbuf->pkt_len;
 768         struct ether_addr *ea;
 769
 770         if (s == 64) {
 771                 stats->size_bins[1]++;
 772         } else if (s > 64 && s < 1024) {
 773                 uint32_t bin;
 774
 775                 /* count zeros, and offset into correct bin */
 776                 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
 777                 stats->size_bins[bin]++;
 778         } else {
 779                 if (s < 64)
 780                         stats->size_bins[0]++;
 781                 else if (s < 1519)
 782                         stats->size_bins[6]++;
 783                 else
 784                         stats->size_bins[7]++;
 785         }
 786
 787         ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
 788         if (is_multicast_ether_addr(ea)) {
 789                 if (is_broadcast_ether_addr(ea))
 790                         stats->broadcast++;
 791                 else
 792                         stats->multicast++;
 793         }
 794 }
 795
 796 static inline void
 797 virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
 798 {
 799         VIRTIO_DUMP_PACKET(m, m->data_len);
 800
 801         rxvq->stats.bytes += m->pkt_len;
 802         virtio_update_packet_stats(&rxvq->stats, m);
 803 }
 804
 805 /* Optionally fill offload information in structure */
 806 static int
 807 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
 808 {
 809         struct rte_net_hdr_lens hdr_lens;
 810         uint32_t hdrlen, ptype;
 811         int l4_supported = 0;
 812
 813         /* nothing to do */
 814         if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
 815                 return 0;
 816
 817         m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
 818
 819         ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
 820         m->packet_type = ptype;
 821         if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
 822             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
 823             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
 824                 l4_supported = 1;
 825
 826         if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
 827                 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
 828                 if (hdr->csum_start <= hdrlen && l4_supported) {
 829                         m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
 830                 } else {
 831                         /* Unknown proto or tunnel, do sw cksum. We can assume
 832                          * the cksum field is in the first segment since the
 833                          * buffers we provided to the host are large enough.
 834                          * In case of SCTP, this will be wrong since it's a CRC
 835                          * but there's nothing we can do.
 836                          */
 837                         uint16_t csum = 0, off;
 838
 839                         rte_raw_cksum_mbuf(m, hdr->csum_start,
 840                                 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
 841                                 &csum);
 842                         if (likely(csum != 0xffff))
 843                                 csum = ~csum;
 844                         off = hdr->csum_offset + hdr->csum_start;
 845                         if (rte_pktmbuf_data_len(m) >= off + 1)
 846                                 *rte_pktmbuf_mtod_offset(m, uint16_t *,
 847                                         off) = csum;
 848                 }
 849         } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
 850                 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
 851         }
 852
 853         /* GSO request, save required information in mbuf */
 854         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
 855                 /* Check unsupported modes */
 856                 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
 857                     (hdr->gso_size == 0)) {
 858                         return -EINVAL;
 859                 }
 860
 861                 /* Update mss lengthes in mbuf */
 862                 m->tso_segsz = hdr->gso_size;
 863                 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
 864                         case VIRTIO_NET_HDR_GSO_TCPV4:
 865                         case VIRTIO_NET_HDR_GSO_TCPV6:
 866                                 m->ol_flags |= PKT_RX_LRO | \
 867                                         PKT_RX_L4_CKSUM_NONE;
 868                                 break;
 869                         default:
 870                                 return -EINVAL;
 871                 }
 872         }
 873
 874         return 0;
 875 }
 876
 877 #define VIRTIO_MBUF_BURST_SZ 64
 878 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
 879 uint16_t
 880 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 881 {
 882         struct virtnet_rx *rxvq = rx_queue;
 883         struct virtqueue *vq = rxvq->vq;
 884         struct virtio_hw *hw = vq->hw;
 885         struct rte_mbuf *rxm, *new_mbuf;
 886         uint16_t nb_used, num, nb_rx;
 887         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 888         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 889         int error;
 890         uint32_t i, nb_enqueued;
 891         uint32_t hdr_size;
 892         struct virtio_net_hdr *hdr;
 893
 894         nb_rx = 0;
 895         if (unlikely(hw->started == 0))
 896                 return nb_rx;
 897
 898         nb_used = VIRTQUEUE_NUSED(vq);
 899
 900         virtio_rmb();
 901
 902         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
 903         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
 904                 num = VIRTIO_MBUF_BURST_SZ;
 905         if (likely(num > DESC_PER_CACHELINE))
 906                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
 907
 908         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
 909         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
 910
 911         nb_enqueued = 0;
 912         hdr_size = hw->vtnet_hdr_size;
 913
 914         for (i = 0; i < num ; i++) {
 915                 rxm = rcv_pkts[i];
 916
 917                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
 918
 919                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
 920                         PMD_RX_LOG(ERR, "Packet drop");
 921                         nb_enqueued++;
 922                         virtio_discard_rxbuf(vq, rxm);
 923                         rxvq->stats.errors++;
 924                         continue;
 925                 }
 926
 927                 rxm->port = rxvq->port_id;
 928                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 929                 rxm->ol_flags = 0;
 930                 rxm->vlan_tci = 0;
 931
 932                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
 933                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
 934
 935                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
 936                         RTE_PKTMBUF_HEADROOM - hdr_size);
 937
 938                 if (hw->vlan_strip)
 939                         rte_vlan_strip(rxm);
 940
 941                 if (hw->has_rx_offload && virtio_rx_offload(rxm, hdr) < 0) {
 942                         virtio_discard_rxbuf(vq, rxm);
 943                         rxvq->stats.errors++;
 944                         continue;
 945                 }
 946
 947                 virtio_rx_stats_updated(rxvq, rxm);
 948
 949                 rx_pkts[nb_rx++] = rxm;
 950         }
 951
 952         rxvq->stats.packets += nb_rx;
 953
 954         /* Allocate new mbuf for the used descriptor */
 955         while (likely(!virtqueue_full(vq))) {
 956                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
 957                 if (unlikely(new_mbuf == NULL)) {
 958                         struct rte_eth_dev *dev
 959                                 = &rte_eth_devices[rxvq->port_id];
 960                         dev->data->rx_mbuf_alloc_failed++;
 961                         break;
 962                 }
 963                 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
 964                 if (unlikely(error)) {
 965                         rte_pktmbuf_free(new_mbuf);
 966                         break;
 967                 }
 968                 nb_enqueued++;
 969         }
 970
 971         if (likely(nb_enqueued)) {
 972                 vq_update_avail_idx(vq);
 973
 974                 if (unlikely(virtqueue_kick_prepare(vq))) {
 975                         virtqueue_notify(vq);
 976                         PMD_RX_LOG(DEBUG, "Notified");
 977                 }
 978         }
 979
 980         return nb_rx;
 981 }
 982
 983 uint16_t
 984 virtio_recv_mergeable_pkts_inorder(void *rx_queue,
 985                         struct rte_mbuf **rx_pkts,
 986                         uint16_t nb_pkts)
 987 {
 988         struct virtnet_rx *rxvq = rx_queue;
 989         struct virtqueue *vq = rxvq->vq;
 990         struct virtio_hw *hw = vq->hw;
 991         struct rte_mbuf *rxm;
 992         struct rte_mbuf *prev;
 993         uint16_t nb_used, num, nb_rx;
 994         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 995         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 996         int error;
 997         uint32_t nb_enqueued;
 998         uint32_t seg_num;
 999         uint32_t seg_res;
1000         uint32_t hdr_size;
1001         int32_t i;
1002
1003         nb_rx = 0;
1004         if (unlikely(hw->started == 0))
1005                 return nb_rx;
1006
1007         nb_used = VIRTQUEUE_NUSED(vq);
1008         nb_used = RTE_MIN(nb_used, nb_pkts);
1009         nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ);
1010
1011         virtio_rmb();
1012
1013         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1014
1015         nb_enqueued = 0;
1016         seg_num = 1;
1017         seg_res = 0;
1018         hdr_size = hw->vtnet_hdr_size;
1019
1020         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
1021
1022         for (i = 0; i < num; i++) {
1023                 struct virtio_net_hdr_mrg_rxbuf *header;
1024
1025                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1026                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1027
1028                 rxm = rcv_pkts[i];
1029
1030                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
1031                         PMD_RX_LOG(ERR, "Packet drop");
1032                         nb_enqueued++;
1033                         virtio_discard_rxbuf_inorder(vq, rxm);
1034                         rxvq->stats.errors++;
1035                         continue;
1036                 }
1037
1038                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1039                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1040                          - hdr_size);
1041                 seg_num = header->num_buffers;
1042
1043                 if (seg_num == 0)
1044                         seg_num = 1;
1045
1046                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1047                 rxm->nb_segs = seg_num;
1048                 rxm->ol_flags = 0;
1049                 rxm->vlan_tci = 0;
1050                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1051                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1052
1053                 rxm->port = rxvq->port_id;
1054
1055                 rx_pkts[nb_rx] = rxm;
1056                 prev = rxm;
1057
1058                 if (vq->hw->has_rx_offload &&
1059                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1060                         virtio_discard_rxbuf_inorder(vq, rxm);
1061                         rxvq->stats.errors++;
1062                         continue;
1063                 }
1064
1065                 if (hw->vlan_strip)
1066                         rte_vlan_strip(rx_pkts[nb_rx]);
1067
1068                 seg_res = seg_num - 1;
1069
1070                 /* Merge remaining segments */
1071                 while (seg_res != 0 && i < (num - 1)) {
1072                         i++;
1073
1074                         rxm = rcv_pkts[i];
1075                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1076                         rxm->pkt_len = (uint32_t)(len[i]);
1077                         rxm->data_len = (uint16_t)(len[i]);
1078
1079                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1080                         rx_pkts[nb_rx]->data_len += (uint16_t)(len[i]);
1081
1082                         if (prev)
1083                                 prev->next = rxm;
1084
1085                         prev = rxm;
1086                         seg_res -= 1;
1087                 }
1088
1089                 if (!seg_res) {
1090                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1091                         nb_rx++;
1092                 }
1093         }
1094
1095         /* Last packet still need merge segments */
1096         while (seg_res != 0) {
1097                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1098                                         VIRTIO_MBUF_BURST_SZ);
1099
1100                 prev = rcv_pkts[nb_rx];
1101                 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1102                         virtio_rmb();
1103                         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
1104                                                            rcv_cnt);
1105                         uint16_t extra_idx = 0;
1106
1107                         rcv_cnt = num;
1108                         while (extra_idx < rcv_cnt) {
1109                                 rxm = rcv_pkts[extra_idx];
1110                                 rxm->data_off =
1111                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1112                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1113                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1114                                 prev->next = rxm;
1115                                 prev = rxm;
1116                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1117                                 rx_pkts[nb_rx]->data_len += len[extra_idx];
1118                                 extra_idx += 1;
1119                         };
1120                         seg_res -= rcv_cnt;
1121
1122                         if (!seg_res) {
1123                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1124                                 nb_rx++;
1125                         }
1126                 } else {
1127                         PMD_RX_LOG(ERR,
1128                                         "No enough segments for packet.");
1129                         virtio_discard_rxbuf_inorder(vq, prev);
1130                         rxvq->stats.errors++;
1131                         break;
1132                 }
1133         }
1134
1135         rxvq->stats.packets += nb_rx;
1136
1137         /* Allocate new mbuf for the used descriptor */
1138
1139         if (likely(!virtqueue_full(vq))) {
1140                 /* free_cnt may include mrg descs */
1141                 uint16_t free_cnt = vq->vq_free_cnt;
1142                 struct rte_mbuf *new_pkts[free_cnt];
1143
1144                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1145                         error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
1146                                         free_cnt);
1147                         if (unlikely(error)) {
1148                                 for (i = 0; i < free_cnt; i++)
1149                                         rte_pktmbuf_free(new_pkts[i]);
1150                         }
1151                         nb_enqueued += free_cnt;
1152                 } else {
1153                         struct rte_eth_dev *dev =
1154                                 &rte_eth_devices[rxvq->port_id];
1155                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1156                 }
1157         }
1158
1159         if (likely(nb_enqueued)) {
1160                 vq_update_avail_idx(vq);
1161
1162                 if (unlikely(virtqueue_kick_prepare(vq))) {
1163                         virtqueue_notify(vq);
1164                         PMD_RX_LOG(DEBUG, "Notified");
1165                 }
1166         }
1167
1168         return nb_rx;
1169 }
1170
1171 uint16_t
1172 virtio_recv_mergeable_pkts(void *rx_queue,
1173                         struct rte_mbuf **rx_pkts,
1174                         uint16_t nb_pkts)
1175 {
1176         struct virtnet_rx *rxvq = rx_queue;
1177         struct virtqueue *vq = rxvq->vq;
1178         struct virtio_hw *hw = vq->hw;
1179         struct rte_mbuf *rxm, *new_mbuf;
1180         uint16_t nb_used, num, nb_rx;
1181         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1182         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1183         struct rte_mbuf *prev;
1184         int error;
1185         uint32_t i, nb_enqueued;
1186         uint32_t seg_num;
1187         uint16_t extra_idx;
1188         uint32_t seg_res;
1189         uint32_t hdr_size;
1190
1191         nb_rx = 0;
1192         if (unlikely(hw->started == 0))
1193                 return nb_rx;
1194
1195         nb_used = VIRTQUEUE_NUSED(vq);
1196
1197         virtio_rmb();
1198
1199         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1200
1201         i = 0;
1202         nb_enqueued = 0;
1203         seg_num = 0;
1204         extra_idx = 0;
1205         seg_res = 0;
1206         hdr_size = hw->vtnet_hdr_size;
1207
1208         while (i < nb_used) {
1209                 struct virtio_net_hdr_mrg_rxbuf *header;
1210
1211                 if (nb_rx == nb_pkts)
1212                         break;
1213
1214                 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
1215                 if (num != 1)
1216                         continue;
1217
1218                 i++;
1219
1220                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1221                 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
1222
1223                 rxm = rcv_pkts[0];
1224
1225                 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
1226                         PMD_RX_LOG(ERR, "Packet drop");
1227                         nb_enqueued++;
1228                         virtio_discard_rxbuf(vq, rxm);
1229                         rxvq->stats.errors++;
1230                         continue;
1231                 }
1232
1233                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
1234                         RTE_PKTMBUF_HEADROOM - hdr_size);
1235                 seg_num = header->num_buffers;
1236
1237                 if (seg_num == 0)
1238                         seg_num = 1;
1239
1240                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1241                 rxm->nb_segs = seg_num;
1242                 rxm->ol_flags = 0;
1243                 rxm->vlan_tci = 0;
1244                 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
1245                 rxm->data_len = (uint16_t)(len[0] - hdr_size);
1246
1247                 rxm->port = rxvq->port_id;
1248                 rx_pkts[nb_rx] = rxm;
1249                 prev = rxm;
1250
1251                 if (hw->has_rx_offload &&
1252                                 virtio_rx_offload(rxm, &header->hdr) < 0) {
1253                         virtio_discard_rxbuf(vq, rxm);
1254                         rxvq->stats.errors++;
1255                         continue;
1256                 }
1257
1258                 seg_res = seg_num - 1;
1259
1260                 while (seg_res != 0) {
1261                         /*
1262                          * Get extra segments for current uncompleted packet.
1263                          */
1264                         uint16_t  rcv_cnt =
1265                                 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
1266                         if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1267                                 virtio_rmb();
1268                                 uint32_t rx_num =
1269                                         virtqueue_dequeue_burst_rx(vq,
1270                                         rcv_pkts, len, rcv_cnt);
1271                                 i += rx_num;
1272                                 rcv_cnt = rx_num;
1273                         } else {
1274                                 PMD_RX_LOG(ERR,
1275                                            "No enough segments for packet.");
1276                                 nb_enqueued++;
1277                                 virtio_discard_rxbuf(vq, rxm);
1278                                 rxvq->stats.errors++;
1279                                 break;
1280                         }
1281
1282                         extra_idx = 0;
1283
1284                         while (extra_idx < rcv_cnt) {
1285                                 rxm = rcv_pkts[extra_idx];
1286
1287                                 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1288                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1289                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1290
1291                                 if (prev)
1292                                         prev->next = rxm;
1293
1294                                 prev = rxm;
1295                                 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
1296                                 extra_idx++;
1297                         };
1298                         seg_res -= rcv_cnt;
1299                 }
1300
1301                 if (hw->vlan_strip)
1302                         rte_vlan_strip(rx_pkts[nb_rx]);
1303
1304                 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
1305                         rx_pkts[nb_rx]->data_len);
1306
1307                 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
1308                 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
1309                 nb_rx++;
1310         }
1311
1312         rxvq->stats.packets += nb_rx;
1313
1314         /* Allocate new mbuf for the used descriptor */
1315         while (likely(!virtqueue_full(vq))) {
1316                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
1317                 if (unlikely(new_mbuf == NULL)) {
1318                         struct rte_eth_dev *dev
1319                                 = &rte_eth_devices[rxvq->port_id];
1320                         dev->data->rx_mbuf_alloc_failed++;
1321                         break;
1322                 }
1323                 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
1324                 if (unlikely(error)) {
1325                         rte_pktmbuf_free(new_mbuf);
1326                         break;
1327                 }
1328                 nb_enqueued++;
1329         }
1330
1331         if (likely(nb_enqueued)) {
1332                 vq_update_avail_idx(vq);
1333
1334                 if (unlikely(virtqueue_kick_prepare(vq))) {
1335                         virtqueue_notify(vq);
1336                         PMD_RX_LOG(DEBUG, "Notified");
1337                 }
1338         }
1339
1340         return nb_rx;
1341 }
1342
1343 uint16_t
1344 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
1345 {
1346         struct virtnet_tx *txvq = tx_queue;
1347         struct virtqueue *vq = txvq->vq;
1348         struct virtio_hw *hw = vq->hw;
1349         uint16_t hdr_size = hw->vtnet_hdr_size;
1350         uint16_t nb_used, nb_tx = 0;
1351         int error;
1352
1353         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1354                 return nb_tx;
1355
1356         if (unlikely(nb_pkts < 1))
1357                 return nb_pkts;
1358
1359         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1360         nb_used = VIRTQUEUE_NUSED(vq);
1361
1362         virtio_rmb();
1363         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1364                 virtio_xmit_cleanup(vq, nb_used);
1365
1366         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1367                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1368                 int can_push = 0, use_indirect = 0, slots, need;
1369
1370                 /* Do VLAN tag insertion */
1371                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1372                         error = rte_vlan_insert(&txm);
1373                         if (unlikely(error)) {
1374                                 rte_pktmbuf_free(txm);
1375                                 continue;
1376                         }
1377                         /* vlan_insert may add a header mbuf */
1378                         tx_pkts[nb_tx] = txm;
1379                 }
1380
1381                 /* optimize ring usage */
1382                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1383                       vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1384                     rte_mbuf_refcnt_read(txm) == 1 &&
1385                     RTE_MBUF_DIRECT(txm) &&
1386                     txm->nb_segs == 1 &&
1387                     rte_pktmbuf_headroom(txm) >= hdr_size &&
1388                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1389                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1390                         can_push = 1;
1391                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1392                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1393                         use_indirect = 1;
1394
1395                 /* How many main ring entries are needed to this Tx?
1396                  * any_layout => number of segments
1397                  * indirect   => 1
1398                  * default    => number of segments + 1
1399                  */
1400                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1401                 need = slots - vq->vq_free_cnt;
1402
1403                 /* Positive value indicates it need free vring descriptors */
1404                 if (unlikely(need > 0)) {
1405                         nb_used = VIRTQUEUE_NUSED(vq);
1406                         virtio_rmb();
1407                         need = RTE_MIN(need, (int)nb_used);
1408
1409                         virtio_xmit_cleanup(vq, need);
1410                         need = slots - vq->vq_free_cnt;
1411                         if (unlikely(need > 0)) {
1412                                 PMD_TX_LOG(ERR,
1413                                            "No free tx descriptors to transmit");
1414                                 break;
1415                         }
1416                 }
1417
1418                 /* Enqueue Packet buffers */
1419                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
1420                         can_push, 0);
1421
1422                 txvq->stats.bytes += txm->pkt_len;
1423                 virtio_update_packet_stats(&txvq->stats, txm);
1424         }
1425
1426         txvq->stats.packets += nb_tx;
1427
1428         if (likely(nb_tx)) {
1429                 vq_update_avail_idx(vq);
1430
1431                 if (unlikely(virtqueue_kick_prepare(vq))) {
1432                         virtqueue_notify(vq);
1433                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1434                 }
1435         }
1436
1437         return nb_tx;
1438 }
1439
1440 uint16_t
1441 virtio_xmit_pkts_inorder(void *tx_queue,
1442                         struct rte_mbuf **tx_pkts,
1443                         uint16_t nb_pkts)
1444 {
1445         struct virtnet_tx *txvq = tx_queue;
1446         struct virtqueue *vq = txvq->vq;
1447         struct virtio_hw *hw = vq->hw;
1448         uint16_t hdr_size = hw->vtnet_hdr_size;
1449         uint16_t nb_used, nb_avail, nb_tx = 0, nb_inorder_pkts = 0;
1450         struct rte_mbuf *inorder_pkts[nb_pkts];
1451         int error;
1452
1453         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1454                 return nb_tx;
1455
1456         if (unlikely(nb_pkts < 1))
1457                 return nb_pkts;
1458
1459         VIRTQUEUE_DUMP(vq);
1460         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1461         nb_used = VIRTQUEUE_NUSED(vq);
1462
1463         virtio_rmb();
1464         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1465                 virtio_xmit_cleanup_inorder(vq, nb_used);
1466
1467         if (unlikely(!vq->vq_free_cnt))
1468                 virtio_xmit_cleanup_inorder(vq, nb_used);
1469
1470         nb_avail = RTE_MIN(vq->vq_free_cnt, nb_pkts);
1471
1472         for (nb_tx = 0; nb_tx < nb_avail; nb_tx++) {
1473                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1474                 int slots, need;
1475
1476                 /* Do VLAN tag insertion */
1477                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1478                         error = rte_vlan_insert(&txm);
1479                         if (unlikely(error)) {
1480                                 rte_pktmbuf_free(txm);
1481                                 continue;
1482                         }
1483                         /* vlan_insert may add a header mbuf */
1484                         tx_pkts[nb_tx] = txm;
1485                 }
1486
1487                 /* optimize ring usage */
1488                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1489                      vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1490                      rte_mbuf_refcnt_read(txm) == 1 &&
1491                      RTE_MBUF_DIRECT(txm) &&
1492                      txm->nb_segs == 1 &&
1493                      rte_pktmbuf_headroom(txm) >= hdr_size &&
1494                      rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1495                                 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
1496                         inorder_pkts[nb_inorder_pkts] = txm;
1497                         nb_inorder_pkts++;
1498
1499                         txvq->stats.bytes += txm->pkt_len;
1500                         virtio_update_packet_stats(&txvq->stats, txm);
1501                         continue;
1502                 }
1503
1504                 if (nb_inorder_pkts) {
1505                         virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
1506                                                         nb_inorder_pkts);
1507                         nb_inorder_pkts = 0;
1508                 }
1509
1510                 slots = txm->nb_segs + 1;
1511                 need = slots - vq->vq_free_cnt;
1512                 if (unlikely(need > 0)) {
1513                         nb_used = VIRTQUEUE_NUSED(vq);
1514                         virtio_rmb();
1515                         need = RTE_MIN(need, (int)nb_used);
1516
1517                         virtio_xmit_cleanup_inorder(vq, need);
1518
1519                         need = slots - vq->vq_free_cnt;
1520
1521                         if (unlikely(need > 0)) {
1522                                 PMD_TX_LOG(ERR,
1523                                         "No free tx descriptors to transmit");
1524                                 break;
1525                         }
1526                 }
1527                 /* Enqueue Packet buffers */
1528                 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
1529
1530                 txvq->stats.bytes += txm->pkt_len;
1531                 virtio_update_packet_stats(&txvq->stats, txm);
1532         }
1533
1534         /* Transmit all inorder packets */
1535         if (nb_inorder_pkts)
1536                 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
1537                                                 nb_inorder_pkts);
1538
1539         txvq->stats.packets += nb_tx;
1540
1541         if (likely(nb_tx)) {
1542                 vq_update_avail_idx(vq);
1543
1544                 if (unlikely(virtqueue_kick_prepare(vq))) {
1545                         virtqueue_notify(vq);
1546                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1547                 }
1548         }
1549
1550         VIRTQUEUE_DUMP(vq);
1551
1552         return nb_tx;
1553 }