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, used_idx, desc_idx = 0, last_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                 struct vring_used_elem *uep;
 204
 205                 used_idx = vq->vq_used_cons_idx & (vq->vq_nentries - 1);
 206                 uep = &vq->vq_ring.used->ring[used_idx];
 207                 desc_idx = (uint16_t)uep->id;
 208
 209                 dxp = &vq->vq_descx[desc_idx];
 210                 vq->vq_used_cons_idx++;
 211
 212                 if (dxp->cookie != NULL) {
 213                         rte_pktmbuf_free(dxp->cookie);
 214                         dxp->cookie = NULL;
 215                 }
 216         }
 217
 218         last_idx = desc_idx + dxp->ndescs - 1;
 219         free_cnt = last_idx - vq->vq_desc_tail_idx;
 220         if (free_cnt <= 0)
 221                 free_cnt += vq->vq_nentries;
 222
 223         vq_ring_free_inorder(vq, last_idx, free_cnt);
 224 }
 225
 226 static inline int
 227 virtqueue_enqueue_refill_inorder(struct virtqueue *vq,
 228                         struct rte_mbuf **cookies,
 229                         uint16_t num)
 230 {
 231         struct vq_desc_extra *dxp;
 232         struct virtio_hw *hw = vq->hw;
 233         struct vring_desc *start_dp;
 234         uint16_t head_idx, idx, i = 0;
 235
 236         if (unlikely(vq->vq_free_cnt == 0))
 237                 return -ENOSPC;
 238         if (unlikely(vq->vq_free_cnt < num))
 239                 return -EMSGSIZE;
 240
 241         head_idx = vq->vq_desc_head_idx & (vq->vq_nentries - 1);
 242         start_dp = vq->vq_ring.desc;
 243
 244         while (i < num) {
 245                 idx = head_idx & (vq->vq_nentries - 1);
 246                 dxp = &vq->vq_descx[idx];
 247                 dxp->cookie = (void *)cookies[i];
 248                 dxp->ndescs = 1;
 249
 250                 start_dp[idx].addr =
 251                                 VIRTIO_MBUF_ADDR(cookies[i], vq) +
 252                                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 253                 start_dp[idx].len =
 254                                 cookies[i]->buf_len -
 255                                 RTE_PKTMBUF_HEADROOM +
 256                                 hw->vtnet_hdr_size;
 257                 start_dp[idx].flags =  VRING_DESC_F_WRITE;
 258
 259                 vq_update_avail_ring(vq, idx);
 260                 head_idx++;
 261                 i++;
 262         }
 263
 264         vq->vq_desc_head_idx += num;
 265         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 266         return 0;
 267 }
 268
 269 static inline int
 270 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
 271 {
 272         struct vq_desc_extra *dxp;
 273         struct virtio_hw *hw = vq->hw;
 274         struct vring_desc *start_dp;
 275         uint16_t needed = 1;
 276         uint16_t head_idx, idx;
 277
 278         if (unlikely(vq->vq_free_cnt == 0))
 279                 return -ENOSPC;
 280         if (unlikely(vq->vq_free_cnt < needed))
 281                 return -EMSGSIZE;
 282
 283         head_idx = vq->vq_desc_head_idx;
 284         if (unlikely(head_idx >= vq->vq_nentries))
 285                 return -EFAULT;
 286
 287         idx = head_idx;
 288         dxp = &vq->vq_descx[idx];
 289         dxp->cookie = (void *)cookie;
 290         dxp->ndescs = needed;
 291
 292         start_dp = vq->vq_ring.desc;
 293         start_dp[idx].addr =
 294                 VIRTIO_MBUF_ADDR(cookie, vq) +
 295                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 296         start_dp[idx].len =
 297                 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
 298         start_dp[idx].flags =  VRING_DESC_F_WRITE;
 299         idx = start_dp[idx].next;
 300         vq->vq_desc_head_idx = idx;
 301         if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 302                 vq->vq_desc_tail_idx = idx;
 303         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 304         vq_update_avail_ring(vq, head_idx);
 305
 306         return 0;
 307 }
 308
 309 /* When doing TSO, the IP length is not included in the pseudo header
 310  * checksum of the packet given to the PMD, but for virtio it is
 311  * expected.
 312  */
 313 static void
 314 virtio_tso_fix_cksum(struct rte_mbuf *m)
 315 {
 316         /* common case: header is not fragmented */
 317         if (likely(rte_pktmbuf_data_len(m) >= m->l2_len + m->l3_len +
 318                         m->l4_len)) {
 319                 struct ipv4_hdr *iph;
 320                 struct ipv6_hdr *ip6h;
 321                 struct tcp_hdr *th;
 322                 uint16_t prev_cksum, new_cksum, ip_len, ip_paylen;
 323                 uint32_t tmp;
 324
 325                 iph = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *, m->l2_len);
 326                 th = RTE_PTR_ADD(iph, m->l3_len);
 327                 if ((iph->version_ihl >> 4) == 4) {
 328                         iph->hdr_checksum = 0;
 329                         iph->hdr_checksum = rte_ipv4_cksum(iph);
 330                         ip_len = iph->total_length;
 331                         ip_paylen = rte_cpu_to_be_16(rte_be_to_cpu_16(ip_len) -
 332                                 m->l3_len);
 333                 } else {
 334                         ip6h = (struct ipv6_hdr *)iph;
 335                         ip_paylen = ip6h->payload_len;
 336                 }
 337
 338                 /* calculate the new phdr checksum not including ip_paylen */
 339                 prev_cksum = th->cksum;
 340                 tmp = prev_cksum;
 341                 tmp += ip_paylen;
 342                 tmp = (tmp & 0xffff) + (tmp >> 16);
 343                 new_cksum = tmp;
 344
 345                 /* replace it in the packet */
 346                 th->cksum = new_cksum;
 347         }
 348 }
 349
 350 static inline int
 351 tx_offload_enabled(struct virtio_hw *hw)
 352 {
 353         return vtpci_with_feature(hw, VIRTIO_NET_F_CSUM) ||
 354                 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO4) ||
 355                 vtpci_with_feature(hw, VIRTIO_NET_F_HOST_TSO6);
 356 }
 357
 358 /* avoid write operation when necessary, to lessen cache issues */
 359 #define ASSIGN_UNLESS_EQUAL(var, val) do {      \
 360         if ((var) != (val))                     \
 361                 (var) = (val);                  \
 362 } while (0)
 363
 364 static inline void
 365 virtqueue_xmit_offload(struct virtio_net_hdr *hdr,
 366                         struct rte_mbuf *cookie,
 367                         int offload)
 368 {
 369         if (offload) {
 370                 if (cookie->ol_flags & PKT_TX_TCP_SEG)
 371                         cookie->ol_flags |= PKT_TX_TCP_CKSUM;
 372
 373                 switch (cookie->ol_flags & PKT_TX_L4_MASK) {
 374                 case PKT_TX_UDP_CKSUM:
 375                         hdr->csum_start = cookie->l2_len + cookie->l3_len;
 376                         hdr->csum_offset = offsetof(struct udp_hdr,
 377                                 dgram_cksum);
 378                         hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 379                         break;
 380
 381                 case PKT_TX_TCP_CKSUM:
 382                         hdr->csum_start = cookie->l2_len + cookie->l3_len;
 383                         hdr->csum_offset = offsetof(struct tcp_hdr, cksum);
 384                         hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 385                         break;
 386
 387                 default:
 388                         ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
 389                         ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
 390                         ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
 391                         break;
 392                 }
 393
 394                 /* TCP Segmentation Offload */
 395                 if (cookie->ol_flags & PKT_TX_TCP_SEG) {
 396                         virtio_tso_fix_cksum(cookie);
 397                         hdr->gso_type = (cookie->ol_flags & PKT_TX_IPV6) ?
 398                                 VIRTIO_NET_HDR_GSO_TCPV6 :
 399                                 VIRTIO_NET_HDR_GSO_TCPV4;
 400                         hdr->gso_size = cookie->tso_segsz;
 401                         hdr->hdr_len =
 402                                 cookie->l2_len +
 403                                 cookie->l3_len +
 404                                 cookie->l4_len;
 405                 } else {
 406                         ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
 407                         ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
 408                         ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
 409                 }
 410         }
 411 }
 412
 413 static inline void
 414 virtqueue_enqueue_xmit_inorder(struct virtnet_tx *txvq,
 415                         struct rte_mbuf **cookies,
 416                         uint16_t num)
 417 {
 418         struct vq_desc_extra *dxp;
 419         struct virtqueue *vq = txvq->vq;
 420         struct vring_desc *start_dp;
 421         struct virtio_net_hdr *hdr;
 422         uint16_t idx;
 423         uint16_t head_size = vq->hw->vtnet_hdr_size;
 424         int offload;
 425         uint16_t i = 0;
 426
 427         idx = vq->vq_desc_head_idx;
 428         start_dp = vq->vq_ring.desc;
 429
 430         offload = tx_offload_enabled(vq->hw);
 431
 432         while (i < num) {
 433                 idx = idx & (vq->vq_nentries - 1);
 434                 dxp = &vq->vq_descx[idx];
 435                 dxp->cookie = (void *)cookies[i];
 436                 dxp->ndescs = 1;
 437
 438                 hdr = (struct virtio_net_hdr *)
 439                         rte_pktmbuf_prepend(cookies[i], head_size);
 440                 cookies[i]->pkt_len -= head_size;
 441
 442                 /* if offload disabled, it is not zeroed below, do it now */
 443                 if (offload == 0) {
 444                         ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
 445                         ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
 446                         ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
 447                         ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
 448                         ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
 449                         ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
 450                 }
 451
 452                 virtqueue_xmit_offload(hdr, cookies[i], offload);
 453
 454                 start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookies[i], vq);
 455                 start_dp[idx].len   = cookies[i]->data_len;
 456                 start_dp[idx].flags = 0;
 457
 458                 vq_update_avail_ring(vq, idx);
 459
 460                 idx++;
 461                 i++;
 462         };
 463
 464         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - num);
 465         vq->vq_desc_head_idx = idx & (vq->vq_nentries - 1);
 466 }
 467
 468 static inline void
 469 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 470                         uint16_t needed, int use_indirect, int can_push,
 471                         int in_order)
 472 {
 473         struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 474         struct vq_desc_extra *dxp;
 475         struct virtqueue *vq = txvq->vq;
 476         struct vring_desc *start_dp;
 477         uint16_t seg_num = cookie->nb_segs;
 478         uint16_t head_idx, idx;
 479         uint16_t head_size = vq->hw->vtnet_hdr_size;
 480         struct virtio_net_hdr *hdr;
 481         int offload;
 482
 483         offload = tx_offload_enabled(vq->hw);
 484
 485         head_idx = vq->vq_desc_head_idx;
 486         idx = head_idx;
 487         dxp = &vq->vq_descx[idx];
 488         dxp->cookie = (void *)cookie;
 489         dxp->ndescs = needed;
 490
 491         start_dp = vq->vq_ring.desc;
 492
 493         if (can_push) {
 494                 /* prepend cannot fail, checked by caller */
 495                 hdr = (struct virtio_net_hdr *)
 496                         rte_pktmbuf_prepend(cookie, head_size);
 497                 /* rte_pktmbuf_prepend() counts the hdr size to the pkt length,
 498                  * which is wrong. Below subtract restores correct pkt size.
 499                  */
 500                 cookie->pkt_len -= head_size;
 501
 502                 /* if offload disabled, it is not zeroed below, do it now */
 503                 if (offload == 0) {
 504                         ASSIGN_UNLESS_EQUAL(hdr->csum_start, 0);
 505                         ASSIGN_UNLESS_EQUAL(hdr->csum_offset, 0);
 506                         ASSIGN_UNLESS_EQUAL(hdr->flags, 0);
 507                         ASSIGN_UNLESS_EQUAL(hdr->gso_type, 0);
 508                         ASSIGN_UNLESS_EQUAL(hdr->gso_size, 0);
 509                         ASSIGN_UNLESS_EQUAL(hdr->hdr_len, 0);
 510                 }
 511         } else if (use_indirect) {
 512                 /* setup tx ring slot to point to indirect
 513                  * descriptor list stored in reserved region.
 514                  *
 515                  * the first slot in indirect ring is already preset
 516                  * to point to the header in reserved region
 517                  */
 518                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 519                         RTE_PTR_DIFF(&txr[idx].tx_indir, txr);
 520                 start_dp[idx].len   = (seg_num + 1) * sizeof(struct vring_desc);
 521                 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
 522                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 523
 524                 /* loop below will fill in rest of the indirect elements */
 525                 start_dp = txr[idx].tx_indir;
 526                 idx = 1;
 527         } else {
 528                 /* setup first tx ring slot to point to header
 529                  * stored in reserved region.
 530                  */
 531                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem +
 532                         RTE_PTR_DIFF(&txr[idx].tx_hdr, txr);
 533                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
 534                 start_dp[idx].flags = VRING_DESC_F_NEXT;
 535                 hdr = (struct virtio_net_hdr *)&txr[idx].tx_hdr;
 536
 537                 idx = start_dp[idx].next;
 538         }
 539
 540         virtqueue_xmit_offload(hdr, cookie, offload);
 541
 542         do {
 543                 start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 544                 start_dp[idx].len   = cookie->data_len;
 545                 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 546                 idx = start_dp[idx].next;
 547         } while ((cookie = cookie->next) != NULL);
 548
 549         if (use_indirect)
 550                 idx = vq->vq_ring.desc[head_idx].next;
 551
 552         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 553
 554         vq->vq_desc_head_idx = idx;
 555         vq_update_avail_ring(vq, head_idx);
 556
 557         if (!in_order) {
 558                 if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 559                         vq->vq_desc_tail_idx = idx;
 560         }
 561 }
 562
 563 void
 564 virtio_dev_cq_start(struct rte_eth_dev *dev)
 565 {
 566         struct virtio_hw *hw = dev->data->dev_private;
 567
 568         if (hw->cvq && hw->cvq->vq) {
 569                 rte_spinlock_init(&hw->cvq->lock);
 570                 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
 571         }
 572 }
 573
 574 int
 575 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
 576                         uint16_t queue_idx,
 577                         uint16_t nb_desc,
 578                         unsigned int socket_id __rte_unused,
 579                         const struct rte_eth_rxconf *rx_conf __rte_unused,
 580                         struct rte_mempool *mp)
 581 {
 582         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 583         struct virtio_hw *hw = dev->data->dev_private;
 584         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 585         struct virtnet_rx *rxvq;
 586
 587         PMD_INIT_FUNC_TRACE();
 588
 589         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
 590                 nb_desc = vq->vq_nentries;
 591         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 592
 593         rxvq = &vq->rxq;
 594         rxvq->queue_id = queue_idx;
 595         rxvq->mpool = mp;
 596         if (rxvq->mpool == NULL) {
 597                 rte_exit(EXIT_FAILURE,
 598                         "Cannot allocate mbufs for rx virtqueue");
 599         }
 600
 601         dev->data->rx_queues[queue_idx] = rxvq;
 602
 603         return 0;
 604 }
 605
 606 int
 607 virtio_dev_rx_queue_setup_finish(struct rte_eth_dev *dev, uint16_t queue_idx)
 608 {
 609         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 610         struct virtio_hw *hw = dev->data->dev_private;
 611         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 612         struct virtnet_rx *rxvq = &vq->rxq;
 613         struct rte_mbuf *m;
 614         uint16_t desc_idx;
 615         int error, nbufs, i;
 616
 617         PMD_INIT_FUNC_TRACE();
 618
 619         /* Allocate blank mbufs for the each rx descriptor */
 620         nbufs = 0;
 621
 622         if (hw->use_simple_rx) {
 623                 for (desc_idx = 0; desc_idx < vq->vq_nentries;
 624                      desc_idx++) {
 625                         vq->vq_ring.avail->ring[desc_idx] = desc_idx;
 626                         vq->vq_ring.desc[desc_idx].flags =
 627                                 VRING_DESC_F_WRITE;
 628                 }
 629
 630                 virtio_rxq_vec_setup(rxvq);
 631         }
 632
 633         memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
 634         for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
 635              desc_idx++) {
 636                 vq->sw_ring[vq->vq_nentries + desc_idx] =
 637                         &rxvq->fake_mbuf;
 638         }
 639
 640         if (hw->use_simple_rx) {
 641                 while (vq->vq_free_cnt >= RTE_VIRTIO_VPMD_RX_REARM_THRESH) {
 642                         virtio_rxq_rearm_vec(rxvq);
 643                         nbufs += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
 644                 }
 645         } else if (hw->use_inorder_rx) {
 646                 if ((!virtqueue_full(vq))) {
 647                         uint16_t free_cnt = vq->vq_free_cnt;
 648                         struct rte_mbuf *pkts[free_cnt];
 649
 650                         if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, pkts,
 651                                 free_cnt)) {
 652                                 error = virtqueue_enqueue_refill_inorder(vq,
 653                                                 pkts,
 654                                                 free_cnt);
 655                                 if (unlikely(error)) {
 656                                         for (i = 0; i < free_cnt; i++)
 657                                                 rte_pktmbuf_free(pkts[i]);
 658                                 }
 659                         }
 660
 661                         nbufs += free_cnt;
 662                         vq_update_avail_idx(vq);
 663                 }
 664         } else {
 665                 while (!virtqueue_full(vq)) {
 666                         m = rte_mbuf_raw_alloc(rxvq->mpool);
 667                         if (m == NULL)
 668                                 break;
 669
 670                         /* Enqueue allocated buffers */
 671                         error = virtqueue_enqueue_recv_refill(vq, m);
 672                         if (error) {
 673                                 rte_pktmbuf_free(m);
 674                                 break;
 675                         }
 676                         nbufs++;
 677                 }
 678
 679                 vq_update_avail_idx(vq);
 680         }
 681
 682         PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
 683
 684         VIRTQUEUE_DUMP(vq);
 685
 686         return 0;
 687 }
 688
 689 /*
 690  * struct rte_eth_dev *dev: Used to update dev
 691  * uint16_t nb_desc: Defaults to values read from config space
 692  * unsigned int socket_id: Used to allocate memzone
 693  * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
 694  * uint16_t queue_idx: Just used as an index in dev txq list
 695  */
 696 int
 697 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 698                         uint16_t queue_idx,
 699                         uint16_t nb_desc,
 700                         unsigned int socket_id __rte_unused,
 701                         const struct rte_eth_txconf *tx_conf)
 702 {
 703         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 704         struct virtio_hw *hw = dev->data->dev_private;
 705         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 706         struct virtnet_tx *txvq;
 707         uint16_t tx_free_thresh;
 708
 709         PMD_INIT_FUNC_TRACE();
 710
 711         if (nb_desc == 0 || nb_desc > vq->vq_nentries)
 712                 nb_desc = vq->vq_nentries;
 713         vq->vq_free_cnt = RTE_MIN(vq->vq_free_cnt, nb_desc);
 714
 715         txvq = &vq->txq;
 716         txvq->queue_id = queue_idx;
 717
 718         tx_free_thresh = tx_conf->tx_free_thresh;
 719         if (tx_free_thresh == 0)
 720                 tx_free_thresh =
 721                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
 722
 723         if (tx_free_thresh >= (vq->vq_nentries - 3)) {
 724                 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
 725                         "number of TX entries minus 3 (%u)."
 726                         " (tx_free_thresh=%u port=%u queue=%u)\n",
 727                         vq->vq_nentries - 3,
 728                         tx_free_thresh, dev->data->port_id, queue_idx);
 729                 return -EINVAL;
 730         }
 731
 732         vq->vq_free_thresh = tx_free_thresh;
 733
 734         dev->data->tx_queues[queue_idx] = txvq;
 735         return 0;
 736 }
 737
 738 int
 739 virtio_dev_tx_queue_setup_finish(struct rte_eth_dev *dev,
 740                                 uint16_t queue_idx)
 741 {
 742         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 743         struct virtio_hw *hw = dev->data->dev_private;
 744         struct virtqueue *vq = hw->vqs[vtpci_queue_idx];
 745
 746         PMD_INIT_FUNC_TRACE();
 747
 748         if (hw->use_inorder_tx)
 749                 vq->vq_ring.desc[vq->vq_nentries - 1].next = 0;
 750
 751         VIRTQUEUE_DUMP(vq);
 752
 753         return 0;
 754 }
 755
 756 static void
 757 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
 758 {
 759         int error;
 760         /*
 761          * Requeue the discarded mbuf. This should always be
 762          * successful since it was just dequeued.
 763          */
 764         error = virtqueue_enqueue_recv_refill(vq, m);
 765
 766         if (unlikely(error)) {
 767                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
 768                 rte_pktmbuf_free(m);
 769         }
 770 }
 771
 772 static void
 773 virtio_discard_rxbuf_inorder(struct virtqueue *vq, struct rte_mbuf *m)
 774 {
 775         int error;
 776
 777         error = virtqueue_enqueue_refill_inorder(vq, &m, 1);
 778         if (unlikely(error)) {
 779                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
 780                 rte_pktmbuf_free(m);
 781         }
 782 }
 783
 784 static void
 785 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
 786 {
 787         uint32_t s = mbuf->pkt_len;
 788         struct ether_addr *ea;
 789
 790         if (s == 64) {
 791                 stats->size_bins[1]++;
 792         } else if (s > 64 && s < 1024) {
 793                 uint32_t bin;
 794
 795                 /* count zeros, and offset into correct bin */
 796                 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
 797                 stats->size_bins[bin]++;
 798         } else {
 799                 if (s < 64)
 800                         stats->size_bins[0]++;
 801                 else if (s < 1519)
 802                         stats->size_bins[6]++;
 803                 else if (s >= 1519)
 804                         stats->size_bins[7]++;
 805         }
 806
 807         ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
 808         if (is_multicast_ether_addr(ea)) {
 809                 if (is_broadcast_ether_addr(ea))
 810                         stats->broadcast++;
 811                 else
 812                         stats->multicast++;
 813         }
 814 }
 815
 816 static inline void
 817 virtio_rx_stats_updated(struct virtnet_rx *rxvq, struct rte_mbuf *m)
 818 {
 819         VIRTIO_DUMP_PACKET(m, m->data_len);
 820
 821         rxvq->stats.bytes += m->pkt_len;
 822         virtio_update_packet_stats(&rxvq->stats, m);
 823 }
 824
 825 /* Optionally fill offload information in structure */
 826 static int
 827 virtio_rx_offload(struct rte_mbuf *m, struct virtio_net_hdr *hdr)
 828 {
 829         struct rte_net_hdr_lens hdr_lens;
 830         uint32_t hdrlen, ptype;
 831         int l4_supported = 0;
 832
 833         /* nothing to do */
 834         if (hdr->flags == 0 && hdr->gso_type == VIRTIO_NET_HDR_GSO_NONE)
 835                 return 0;
 836
 837         m->ol_flags |= PKT_RX_IP_CKSUM_UNKNOWN;
 838
 839         ptype = rte_net_get_ptype(m, &hdr_lens, RTE_PTYPE_ALL_MASK);
 840         m->packet_type = ptype;
 841         if ((ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP ||
 842             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP ||
 843             (ptype & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP)
 844                 l4_supported = 1;
 845
 846         if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
 847                 hdrlen = hdr_lens.l2_len + hdr_lens.l3_len + hdr_lens.l4_len;
 848                 if (hdr->csum_start <= hdrlen && l4_supported) {
 849                         m->ol_flags |= PKT_RX_L4_CKSUM_NONE;
 850                 } else {
 851                         /* Unknown proto or tunnel, do sw cksum. We can assume
 852                          * the cksum field is in the first segment since the
 853                          * buffers we provided to the host are large enough.
 854                          * In case of SCTP, this will be wrong since it's a CRC
 855                          * but there's nothing we can do.
 856                          */
 857                         uint16_t csum = 0, off;
 858
 859                         rte_raw_cksum_mbuf(m, hdr->csum_start,
 860                                 rte_pktmbuf_pkt_len(m) - hdr->csum_start,
 861                                 &csum);
 862                         if (likely(csum != 0xffff))
 863                                 csum = ~csum;
 864                         off = hdr->csum_offset + hdr->csum_start;
 865                         if (rte_pktmbuf_data_len(m) >= off + 1)
 866                                 *rte_pktmbuf_mtod_offset(m, uint16_t *,
 867                                         off) = csum;
 868                 }
 869         } else if (hdr->flags & VIRTIO_NET_HDR_F_DATA_VALID && l4_supported) {
 870                 m->ol_flags |= PKT_RX_L4_CKSUM_GOOD;
 871         }
 872
 873         /* GSO request, save required information in mbuf */
 874         if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
 875                 /* Check unsupported modes */
 876                 if ((hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) ||
 877                     (hdr->gso_size == 0)) {
 878                         return -EINVAL;
 879                 }
 880
 881                 /* Update mss lengthes in mbuf */
 882                 m->tso_segsz = hdr->gso_size;
 883                 switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
 884                         case VIRTIO_NET_HDR_GSO_TCPV4:
 885                         case VIRTIO_NET_HDR_GSO_TCPV6:
 886                                 m->ol_flags |= PKT_RX_LRO | \
 887                                         PKT_RX_L4_CKSUM_NONE;
 888                                 break;
 889                         default:
 890                                 return -EINVAL;
 891                 }
 892         }
 893
 894         return 0;
 895 }
 896
 897 static inline int
 898 rx_offload_enabled(struct virtio_hw *hw)
 899 {
 900         return vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_CSUM) ||
 901                 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO4) ||
 902                 vtpci_with_feature(hw, VIRTIO_NET_F_GUEST_TSO6);
 903 }
 904
 905 #define VIRTIO_MBUF_BURST_SZ 64
 906 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
 907 uint16_t
 908 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 909 {
 910         struct virtnet_rx *rxvq = rx_queue;
 911         struct virtqueue *vq = rxvq->vq;
 912         struct virtio_hw *hw = vq->hw;
 913         struct rte_mbuf *rxm, *new_mbuf;
 914         uint16_t nb_used, num, nb_rx;
 915         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 916         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 917         int error;
 918         uint32_t i, nb_enqueued;
 919         uint32_t hdr_size;
 920         int offload;
 921         struct virtio_net_hdr *hdr;
 922
 923         nb_rx = 0;
 924         if (unlikely(hw->started == 0))
 925                 return nb_rx;
 926
 927         nb_used = VIRTQUEUE_NUSED(vq);
 928
 929         virtio_rmb();
 930
 931         num = likely(nb_used <= nb_pkts) ? nb_used : nb_pkts;
 932         if (unlikely(num > VIRTIO_MBUF_BURST_SZ))
 933                 num = VIRTIO_MBUF_BURST_SZ;
 934         if (likely(num > DESC_PER_CACHELINE))
 935                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
 936
 937         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
 938         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
 939
 940         nb_enqueued = 0;
 941         hdr_size = hw->vtnet_hdr_size;
 942         offload = rx_offload_enabled(hw);
 943
 944         for (i = 0; i < num ; i++) {
 945                 rxm = rcv_pkts[i];
 946
 947                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
 948
 949                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
 950                         PMD_RX_LOG(ERR, "Packet drop");
 951                         nb_enqueued++;
 952                         virtio_discard_rxbuf(vq, rxm);
 953                         rxvq->stats.errors++;
 954                         continue;
 955                 }
 956
 957                 rxm->port = rxvq->port_id;
 958                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 959                 rxm->ol_flags = 0;
 960                 rxm->vlan_tci = 0;
 961
 962                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
 963                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
 964
 965                 hdr = (struct virtio_net_hdr *)((char *)rxm->buf_addr +
 966                         RTE_PKTMBUF_HEADROOM - hdr_size);
 967
 968                 if (hw->vlan_strip)
 969                         rte_vlan_strip(rxm);
 970
 971                 if (offload && virtio_rx_offload(rxm, hdr) < 0) {
 972                         virtio_discard_rxbuf(vq, rxm);
 973                         rxvq->stats.errors++;
 974                         continue;
 975                 }
 976
 977                 virtio_rx_stats_updated(rxvq, rxm);
 978
 979                 rx_pkts[nb_rx++] = rxm;
 980         }
 981
 982         rxvq->stats.packets += nb_rx;
 983
 984         /* Allocate new mbuf for the used descriptor */
 985         error = ENOSPC;
 986         while (likely(!virtqueue_full(vq))) {
 987                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
 988                 if (unlikely(new_mbuf == NULL)) {
 989                         struct rte_eth_dev *dev
 990                                 = &rte_eth_devices[rxvq->port_id];
 991                         dev->data->rx_mbuf_alloc_failed++;
 992                         break;
 993                 }
 994                 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
 995                 if (unlikely(error)) {
 996                         rte_pktmbuf_free(new_mbuf);
 997                         break;
 998                 }
 999                 nb_enqueued++;
1000         }
1001
1002         if (likely(nb_enqueued)) {
1003                 vq_update_avail_idx(vq);
1004
1005                 if (unlikely(virtqueue_kick_prepare(vq))) {
1006                         virtqueue_notify(vq);
1007                         PMD_RX_LOG(DEBUG, "Notified");
1008                 }
1009         }
1010
1011         return nb_rx;
1012 }
1013
1014 uint16_t
1015 virtio_recv_mergeable_pkts_inorder(void *rx_queue,
1016                         struct rte_mbuf **rx_pkts,
1017                         uint16_t nb_pkts)
1018 {
1019         struct virtnet_rx *rxvq = rx_queue;
1020         struct virtqueue *vq = rxvq->vq;
1021         struct virtio_hw *hw = vq->hw;
1022         struct rte_mbuf *rxm;
1023         struct rte_mbuf *prev;
1024         uint16_t nb_used, num, nb_rx;
1025         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1026         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1027         int error;
1028         uint32_t nb_enqueued;
1029         uint32_t seg_num;
1030         uint32_t seg_res;
1031         uint32_t hdr_size;
1032         int32_t i;
1033         int offload;
1034
1035         nb_rx = 0;
1036         if (unlikely(hw->started == 0))
1037                 return nb_rx;
1038
1039         nb_used = VIRTQUEUE_NUSED(vq);
1040         nb_used = RTE_MIN(nb_used, nb_pkts);
1041         nb_used = RTE_MIN(nb_used, VIRTIO_MBUF_BURST_SZ);
1042
1043         virtio_rmb();
1044
1045         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1046
1047         nb_enqueued = 0;
1048         seg_num = 1;
1049         seg_res = 0;
1050         hdr_size = hw->vtnet_hdr_size;
1051         offload = rx_offload_enabled(hw);
1052
1053         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len, nb_used);
1054
1055         for (i = 0; i < num; i++) {
1056                 struct virtio_net_hdr_mrg_rxbuf *header;
1057
1058                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1059                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
1060
1061                 rxm = rcv_pkts[i];
1062
1063                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
1064                         PMD_RX_LOG(ERR, "Packet drop");
1065                         nb_enqueued++;
1066                         virtio_discard_rxbuf_inorder(vq, rxm);
1067                         rxvq->stats.errors++;
1068                         continue;
1069                 }
1070
1071                 header = (struct virtio_net_hdr_mrg_rxbuf *)
1072                          ((char *)rxm->buf_addr + RTE_PKTMBUF_HEADROOM
1073                          - hdr_size);
1074                 seg_num = header->num_buffers;
1075
1076                 if (seg_num == 0)
1077                         seg_num = 1;
1078
1079                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1080                 rxm->nb_segs = seg_num;
1081                 rxm->ol_flags = 0;
1082                 rxm->vlan_tci = 0;
1083                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
1084                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
1085
1086                 rxm->port = rxvq->port_id;
1087
1088                 rx_pkts[nb_rx] = rxm;
1089                 prev = rxm;
1090
1091                 if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
1092                         virtio_discard_rxbuf_inorder(vq, rxm);
1093                         rxvq->stats.errors++;
1094                         continue;
1095                 }
1096
1097                 if (hw->vlan_strip)
1098                         rte_vlan_strip(rx_pkts[nb_rx]);
1099
1100                 seg_res = seg_num - 1;
1101
1102                 /* Merge remaining segments */
1103                 while (seg_res != 0 && i < (num - 1)) {
1104                         i++;
1105
1106                         rxm = rcv_pkts[i];
1107                         rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1108                         rxm->pkt_len = (uint32_t)(len[i]);
1109                         rxm->data_len = (uint16_t)(len[i]);
1110
1111                         rx_pkts[nb_rx]->pkt_len += (uint32_t)(len[i]);
1112                         rx_pkts[nb_rx]->data_len += (uint16_t)(len[i]);
1113
1114                         if (prev)
1115                                 prev->next = rxm;
1116
1117                         prev = rxm;
1118                         seg_res -= 1;
1119                 }
1120
1121                 if (!seg_res) {
1122                         virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1123                         nb_rx++;
1124                 }
1125         }
1126
1127         /* Last packet still need merge segments */
1128         while (seg_res != 0) {
1129                 uint16_t rcv_cnt = RTE_MIN((uint16_t)seg_res,
1130                                         VIRTIO_MBUF_BURST_SZ);
1131
1132                 prev = rcv_pkts[nb_rx];
1133                 if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1134                         num = virtqueue_dequeue_rx_inorder(vq, rcv_pkts, len,
1135                                                            rcv_cnt);
1136                         uint16_t extra_idx = 0;
1137
1138                         rcv_cnt = num;
1139                         while (extra_idx < rcv_cnt) {
1140                                 rxm = rcv_pkts[extra_idx];
1141                                 rxm->data_off =
1142                                         RTE_PKTMBUF_HEADROOM - hdr_size;
1143                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1144                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1145                                 prev->next = rxm;
1146                                 prev = rxm;
1147                                 rx_pkts[nb_rx]->pkt_len += len[extra_idx];
1148                                 rx_pkts[nb_rx]->data_len += len[extra_idx];
1149                                 extra_idx += 1;
1150                         };
1151                         seg_res -= rcv_cnt;
1152
1153                         if (!seg_res) {
1154                                 virtio_rx_stats_updated(rxvq, rx_pkts[nb_rx]);
1155                                 nb_rx++;
1156                         }
1157                 } else {
1158                         PMD_RX_LOG(ERR,
1159                                         "No enough segments for packet.");
1160                         virtio_discard_rxbuf_inorder(vq, prev);
1161                         rxvq->stats.errors++;
1162                         break;
1163                 }
1164         }
1165
1166         rxvq->stats.packets += nb_rx;
1167
1168         /* Allocate new mbuf for the used descriptor */
1169
1170         if (likely(!virtqueue_full(vq))) {
1171                 /* free_cnt may include mrg descs */
1172                 uint16_t free_cnt = vq->vq_free_cnt;
1173                 struct rte_mbuf *new_pkts[free_cnt];
1174
1175                 if (!rte_pktmbuf_alloc_bulk(rxvq->mpool, new_pkts, free_cnt)) {
1176                         error = virtqueue_enqueue_refill_inorder(vq, new_pkts,
1177                                         free_cnt);
1178                         if (unlikely(error)) {
1179                                 for (i = 0; i < free_cnt; i++)
1180                                         rte_pktmbuf_free(new_pkts[i]);
1181                         }
1182                         nb_enqueued += free_cnt;
1183                 } else {
1184                         struct rte_eth_dev *dev =
1185                                 &rte_eth_devices[rxvq->port_id];
1186                         dev->data->rx_mbuf_alloc_failed += free_cnt;
1187                 }
1188         }
1189
1190         if (likely(nb_enqueued)) {
1191                 vq_update_avail_idx(vq);
1192
1193                 if (unlikely(virtqueue_kick_prepare(vq))) {
1194                         virtqueue_notify(vq);
1195                         PMD_RX_LOG(DEBUG, "Notified");
1196                 }
1197         }
1198
1199         return nb_rx;
1200 }
1201
1202 uint16_t
1203 virtio_recv_mergeable_pkts(void *rx_queue,
1204                         struct rte_mbuf **rx_pkts,
1205                         uint16_t nb_pkts)
1206 {
1207         struct virtnet_rx *rxvq = rx_queue;
1208         struct virtqueue *vq = rxvq->vq;
1209         struct virtio_hw *hw = vq->hw;
1210         struct rte_mbuf *rxm, *new_mbuf;
1211         uint16_t nb_used, num, nb_rx;
1212         uint32_t len[VIRTIO_MBUF_BURST_SZ];
1213         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
1214         struct rte_mbuf *prev;
1215         int error;
1216         uint32_t i, nb_enqueued;
1217         uint32_t seg_num;
1218         uint16_t extra_idx;
1219         uint32_t seg_res;
1220         uint32_t hdr_size;
1221         int offload;
1222
1223         nb_rx = 0;
1224         if (unlikely(hw->started == 0))
1225                 return nb_rx;
1226
1227         nb_used = VIRTQUEUE_NUSED(vq);
1228
1229         virtio_rmb();
1230
1231         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
1232
1233         i = 0;
1234         nb_enqueued = 0;
1235         seg_num = 0;
1236         extra_idx = 0;
1237         seg_res = 0;
1238         hdr_size = hw->vtnet_hdr_size;
1239         offload = rx_offload_enabled(hw);
1240
1241         while (i < nb_used) {
1242                 struct virtio_net_hdr_mrg_rxbuf *header;
1243
1244                 if (nb_rx == nb_pkts)
1245                         break;
1246
1247                 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
1248                 if (num != 1)
1249                         continue;
1250
1251                 i++;
1252
1253                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
1254                 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
1255
1256                 rxm = rcv_pkts[0];
1257
1258                 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
1259                         PMD_RX_LOG(ERR, "Packet drop");
1260                         nb_enqueued++;
1261                         virtio_discard_rxbuf(vq, rxm);
1262                         rxvq->stats.errors++;
1263                         continue;
1264                 }
1265
1266                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
1267                         RTE_PKTMBUF_HEADROOM - hdr_size);
1268                 seg_num = header->num_buffers;
1269
1270                 if (seg_num == 0)
1271                         seg_num = 1;
1272
1273                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
1274                 rxm->nb_segs = seg_num;
1275                 rxm->ol_flags = 0;
1276                 rxm->vlan_tci = 0;
1277                 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
1278                 rxm->data_len = (uint16_t)(len[0] - hdr_size);
1279
1280                 rxm->port = rxvq->port_id;
1281                 rx_pkts[nb_rx] = rxm;
1282                 prev = rxm;
1283
1284                 if (offload && virtio_rx_offload(rxm, &header->hdr) < 0) {
1285                         virtio_discard_rxbuf(vq, rxm);
1286                         rxvq->stats.errors++;
1287                         continue;
1288                 }
1289
1290                 seg_res = seg_num - 1;
1291
1292                 while (seg_res != 0) {
1293                         /*
1294                          * Get extra segments for current uncompleted packet.
1295                          */
1296                         uint16_t  rcv_cnt =
1297                                 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
1298                         if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
1299                                 uint32_t rx_num =
1300                                         virtqueue_dequeue_burst_rx(vq,
1301                                         rcv_pkts, len, rcv_cnt);
1302                                 i += rx_num;
1303                                 rcv_cnt = rx_num;
1304                         } else {
1305                                 PMD_RX_LOG(ERR,
1306                                            "No enough segments for packet.");
1307                                 nb_enqueued++;
1308                                 virtio_discard_rxbuf(vq, rxm);
1309                                 rxvq->stats.errors++;
1310                                 break;
1311                         }
1312
1313                         extra_idx = 0;
1314
1315                         while (extra_idx < rcv_cnt) {
1316                                 rxm = rcv_pkts[extra_idx];
1317
1318                                 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
1319                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
1320                                 rxm->data_len = (uint16_t)(len[extra_idx]);
1321
1322                                 if (prev)
1323                                         prev->next = rxm;
1324
1325                                 prev = rxm;
1326                                 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
1327                                 extra_idx++;
1328                         };
1329                         seg_res -= rcv_cnt;
1330                 }
1331
1332                 if (hw->vlan_strip)
1333                         rte_vlan_strip(rx_pkts[nb_rx]);
1334
1335                 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
1336                         rx_pkts[nb_rx]->data_len);
1337
1338                 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
1339                 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
1340                 nb_rx++;
1341         }
1342
1343         rxvq->stats.packets += nb_rx;
1344
1345         /* Allocate new mbuf for the used descriptor */
1346         error = ENOSPC;
1347         while (likely(!virtqueue_full(vq))) {
1348                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
1349                 if (unlikely(new_mbuf == NULL)) {
1350                         struct rte_eth_dev *dev
1351                                 = &rte_eth_devices[rxvq->port_id];
1352                         dev->data->rx_mbuf_alloc_failed++;
1353                         break;
1354                 }
1355                 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
1356                 if (unlikely(error)) {
1357                         rte_pktmbuf_free(new_mbuf);
1358                         break;
1359                 }
1360                 nb_enqueued++;
1361         }
1362
1363         if (likely(nb_enqueued)) {
1364                 vq_update_avail_idx(vq);
1365
1366                 if (unlikely(virtqueue_kick_prepare(vq))) {
1367                         virtqueue_notify(vq);
1368                         PMD_RX_LOG(DEBUG, "Notified");
1369                 }
1370         }
1371
1372         return nb_rx;
1373 }
1374
1375 uint16_t
1376 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
1377 {
1378         struct virtnet_tx *txvq = tx_queue;
1379         struct virtqueue *vq = txvq->vq;
1380         struct virtio_hw *hw = vq->hw;
1381         uint16_t hdr_size = hw->vtnet_hdr_size;
1382         uint16_t nb_used, nb_tx = 0;
1383         int error;
1384
1385         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1386                 return nb_tx;
1387
1388         if (unlikely(nb_pkts < 1))
1389                 return nb_pkts;
1390
1391         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1392         nb_used = VIRTQUEUE_NUSED(vq);
1393
1394         virtio_rmb();
1395         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1396                 virtio_xmit_cleanup(vq, nb_used);
1397
1398         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
1399                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1400                 int can_push = 0, use_indirect = 0, slots, need;
1401
1402                 /* Do VLAN tag insertion */
1403                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1404                         error = rte_vlan_insert(&txm);
1405                         if (unlikely(error)) {
1406                                 rte_pktmbuf_free(txm);
1407                                 continue;
1408                         }
1409                 }
1410
1411                 /* optimize ring usage */
1412                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1413                       vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1414                     rte_mbuf_refcnt_read(txm) == 1 &&
1415                     RTE_MBUF_DIRECT(txm) &&
1416                     txm->nb_segs == 1 &&
1417                     rte_pktmbuf_headroom(txm) >= hdr_size &&
1418                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1419                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
1420                         can_push = 1;
1421                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
1422                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
1423                         use_indirect = 1;
1424
1425                 /* How many main ring entries are needed to this Tx?
1426                  * any_layout => number of segments
1427                  * indirect   => 1
1428                  * default    => number of segments + 1
1429                  */
1430                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
1431                 need = slots - vq->vq_free_cnt;
1432
1433                 /* Positive value indicates it need free vring descriptors */
1434                 if (unlikely(need > 0)) {
1435                         nb_used = VIRTQUEUE_NUSED(vq);
1436                         virtio_rmb();
1437                         need = RTE_MIN(need, (int)nb_used);
1438
1439                         virtio_xmit_cleanup(vq, need);
1440                         need = slots - vq->vq_free_cnt;
1441                         if (unlikely(need > 0)) {
1442                                 PMD_TX_LOG(ERR,
1443                                            "No free tx descriptors to transmit");
1444                                 break;
1445                         }
1446                 }
1447
1448                 /* Enqueue Packet buffers */
1449                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect,
1450                         can_push, 0);
1451
1452                 txvq->stats.bytes += txm->pkt_len;
1453                 virtio_update_packet_stats(&txvq->stats, txm);
1454         }
1455
1456         txvq->stats.packets += nb_tx;
1457
1458         if (likely(nb_tx)) {
1459                 vq_update_avail_idx(vq);
1460
1461                 if (unlikely(virtqueue_kick_prepare(vq))) {
1462                         virtqueue_notify(vq);
1463                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1464                 }
1465         }
1466
1467         return nb_tx;
1468 }
1469
1470 uint16_t
1471 virtio_xmit_pkts_inorder(void *tx_queue,
1472                         struct rte_mbuf **tx_pkts,
1473                         uint16_t nb_pkts)
1474 {
1475         struct virtnet_tx *txvq = tx_queue;
1476         struct virtqueue *vq = txvq->vq;
1477         struct virtio_hw *hw = vq->hw;
1478         uint16_t hdr_size = hw->vtnet_hdr_size;
1479         uint16_t nb_used, nb_avail, nb_tx = 0, nb_inorder_pkts = 0;
1480         struct rte_mbuf *inorder_pkts[nb_pkts];
1481         int error;
1482
1483         if (unlikely(hw->started == 0 && tx_pkts != hw->inject_pkts))
1484                 return nb_tx;
1485
1486         if (unlikely(nb_pkts < 1))
1487                 return nb_pkts;
1488
1489         VIRTQUEUE_DUMP(vq);
1490         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
1491         nb_used = VIRTQUEUE_NUSED(vq);
1492
1493         virtio_rmb();
1494         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
1495                 virtio_xmit_cleanup_inorder(vq, nb_used);
1496
1497         if (unlikely(!vq->vq_free_cnt))
1498                 virtio_xmit_cleanup_inorder(vq, nb_used);
1499
1500         nb_avail = RTE_MIN(vq->vq_free_cnt, nb_pkts);
1501
1502         for (nb_tx = 0; nb_tx < nb_avail; nb_tx++) {
1503                 struct rte_mbuf *txm = tx_pkts[nb_tx];
1504                 int slots, need;
1505
1506                 /* Do VLAN tag insertion */
1507                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
1508                         error = rte_vlan_insert(&txm);
1509                         if (unlikely(error)) {
1510                                 rte_pktmbuf_free(txm);
1511                                 continue;
1512                         }
1513                 }
1514
1515                 /* optimize ring usage */
1516                 if ((vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) ||
1517                      vtpci_with_feature(hw, VIRTIO_F_VERSION_1)) &&
1518                      rte_mbuf_refcnt_read(txm) == 1 &&
1519                      RTE_MBUF_DIRECT(txm) &&
1520                      txm->nb_segs == 1 &&
1521                      rte_pktmbuf_headroom(txm) >= hdr_size &&
1522                      rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
1523                                 __alignof__(struct virtio_net_hdr_mrg_rxbuf))) {
1524                         inorder_pkts[nb_inorder_pkts] = txm;
1525                         nb_inorder_pkts++;
1526
1527                         txvq->stats.bytes += txm->pkt_len;
1528                         virtio_update_packet_stats(&txvq->stats, txm);
1529                         continue;
1530                 }
1531
1532                 if (nb_inorder_pkts) {
1533                         virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
1534                                                         nb_inorder_pkts);
1535                         nb_inorder_pkts = 0;
1536                 }
1537
1538                 slots = txm->nb_segs + 1;
1539                 need = slots - vq->vq_free_cnt;
1540                 if (unlikely(need > 0)) {
1541                         nb_used = VIRTQUEUE_NUSED(vq);
1542                         virtio_rmb();
1543                         need = RTE_MIN(need, (int)nb_used);
1544
1545                         virtio_xmit_cleanup_inorder(vq, need);
1546
1547                         need = slots - vq->vq_free_cnt;
1548
1549                         if (unlikely(need > 0)) {
1550                                 PMD_TX_LOG(ERR,
1551                                         "No free tx descriptors to transmit");
1552                                 break;
1553                         }
1554                 }
1555                 /* Enqueue Packet buffers */
1556                 virtqueue_enqueue_xmit(txvq, txm, slots, 0, 0, 1);
1557
1558                 txvq->stats.bytes += txm->pkt_len;
1559                 virtio_update_packet_stats(&txvq->stats, txm);
1560         }
1561
1562         /* Transmit all inorder packets */
1563         if (nb_inorder_pkts)
1564                 virtqueue_enqueue_xmit_inorder(txvq, inorder_pkts,
1565                                                 nb_inorder_pkts);
1566
1567         txvq->stats.packets += nb_tx;
1568
1569         if (likely(nb_tx)) {
1570                 vq_update_avail_idx(vq);
1571
1572                 if (unlikely(virtqueue_kick_prepare(vq))) {
1573                         virtqueue_notify(vq);
1574                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
1575                 }
1576         }
1577
1578         VIRTQUEUE_DUMP(vq);
1579
1580         return nb_tx;
1581 }