drivers/net/virtio/virtio_rxtx.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <stdint.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <errno.h>
  39
  40 #include <rte_cycles.h>
  41 #include <rte_memory.h>
  42 #include <rte_memzone.h>
  43 #include <rte_branch_prediction.h>
  44 #include <rte_mempool.h>
  45 #include <rte_malloc.h>
  46 #include <rte_mbuf.h>
  47 #include <rte_ether.h>
  48 #include <rte_ethdev.h>
  49 #include <rte_prefetch.h>
  50 #include <rte_string_fns.h>
  51 #include <rte_errno.h>
  52 #include <rte_byteorder.h>
  53
  54 #include "virtio_logs.h"
  55 #include "virtio_ethdev.h"
  56 #include "virtio_pci.h"
  57 #include "virtqueue.h"
  58 #include "virtio_rxtx.h"
  59
  60 #ifdef RTE_LIBRTE_VIRTIO_DEBUG_DUMP
  61 #define VIRTIO_DUMP_PACKET(m, len) rte_pktmbuf_dump(stdout, m, len)
  62 #else
  63 #define  VIRTIO_DUMP_PACKET(m, len) do { } while (0)
  64 #endif
  65
  66
  67 #define VIRTIO_SIMPLE_FLAGS ((uint32_t)ETH_TXQ_FLAGS_NOMULTSEGS | \
  68         ETH_TXQ_FLAGS_NOOFFLOADS)
  69
  70 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
  71 static int use_simple_rxtx;
  72 #endif
  73
  74 static void
  75 vq_ring_free_chain(struct virtqueue *vq, uint16_t desc_idx)
  76 {
  77         struct vring_desc *dp, *dp_tail;
  78         struct vq_desc_extra *dxp;
  79         uint16_t desc_idx_last = desc_idx;
  80
  81         dp  = &vq->vq_ring.desc[desc_idx];
  82         dxp = &vq->vq_descx[desc_idx];
  83         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt + dxp->ndescs);
  84         if ((dp->flags & VRING_DESC_F_INDIRECT) == 0) {
  85                 while (dp->flags & VRING_DESC_F_NEXT) {
  86                         desc_idx_last = dp->next;
  87                         dp = &vq->vq_ring.desc[dp->next];
  88                 }
  89         }
  90         dxp->ndescs = 0;
  91
  92         /*
  93          * We must append the existing free chain, if any, to the end of
  94          * newly freed chain. If the virtqueue was completely used, then
  95          * head would be VQ_RING_DESC_CHAIN_END (ASSERTed above).
  96          */
  97         if (vq->vq_desc_tail_idx == VQ_RING_DESC_CHAIN_END) {
  98                 vq->vq_desc_head_idx = desc_idx;
  99         } else {
 100                 dp_tail = &vq->vq_ring.desc[vq->vq_desc_tail_idx];
 101                 dp_tail->next = desc_idx;
 102         }
 103
 104         vq->vq_desc_tail_idx = desc_idx_last;
 105         dp->next = VQ_RING_DESC_CHAIN_END;
 106 }
 107
 108 static uint16_t
 109 virtqueue_dequeue_burst_rx(struct virtqueue *vq, struct rte_mbuf **rx_pkts,
 110                            uint32_t *len, uint16_t num)
 111 {
 112         struct vring_used_elem *uep;
 113         struct rte_mbuf *cookie;
 114         uint16_t used_idx, desc_idx;
 115         uint16_t i;
 116
 117         /*  Caller does the check */
 118         for (i = 0; i < num ; i++) {
 119                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
 120                 uep = &vq->vq_ring.used->ring[used_idx];
 121                 desc_idx = (uint16_t) uep->id;
 122                 len[i] = uep->len;
 123                 cookie = (struct rte_mbuf *)vq->vq_descx[desc_idx].cookie;
 124
 125                 if (unlikely(cookie == NULL)) {
 126                         PMD_DRV_LOG(ERR, "vring descriptor with no mbuf cookie at %u\n",
 127                                 vq->vq_used_cons_idx);
 128                         break;
 129                 }
 130
 131                 rte_prefetch0(cookie);
 132                 rte_packet_prefetch(rte_pktmbuf_mtod(cookie, void *));
 133                 rx_pkts[i]  = cookie;
 134                 vq->vq_used_cons_idx++;
 135                 vq_ring_free_chain(vq, desc_idx);
 136                 vq->vq_descx[desc_idx].cookie = NULL;
 137         }
 138
 139         return i;
 140 }
 141
 142 #ifndef DEFAULT_TX_FREE_THRESH
 143 #define DEFAULT_TX_FREE_THRESH 32
 144 #endif
 145
 146 /* Cleanup from completed transmits. */
 147 static void
 148 virtio_xmit_cleanup(struct virtqueue *vq, uint16_t num)
 149 {
 150         uint16_t i, used_idx, desc_idx;
 151         for (i = 0; i < num; i++) {
 152                 struct vring_used_elem *uep;
 153                 struct vq_desc_extra *dxp;
 154
 155                 used_idx = (uint16_t)(vq->vq_used_cons_idx & (vq->vq_nentries - 1));
 156                 uep = &vq->vq_ring.used->ring[used_idx];
 157
 158                 desc_idx = (uint16_t) uep->id;
 159                 dxp = &vq->vq_descx[desc_idx];
 160                 vq->vq_used_cons_idx++;
 161                 vq_ring_free_chain(vq, desc_idx);
 162
 163                 if (dxp->cookie != NULL) {
 164                         rte_pktmbuf_free(dxp->cookie);
 165                         dxp->cookie = NULL;
 166                 }
 167         }
 168 }
 169
 170
 171 static inline int
 172 virtqueue_enqueue_recv_refill(struct virtqueue *vq, struct rte_mbuf *cookie)
 173 {
 174         struct vq_desc_extra *dxp;
 175         struct virtio_hw *hw = vq->hw;
 176         struct vring_desc *start_dp;
 177         uint16_t needed = 1;
 178         uint16_t head_idx, idx;
 179
 180         if (unlikely(vq->vq_free_cnt == 0))
 181                 return -ENOSPC;
 182         if (unlikely(vq->vq_free_cnt < needed))
 183                 return -EMSGSIZE;
 184
 185         head_idx = vq->vq_desc_head_idx;
 186         if (unlikely(head_idx >= vq->vq_nentries))
 187                 return -EFAULT;
 188
 189         idx = head_idx;
 190         dxp = &vq->vq_descx[idx];
 191         dxp->cookie = (void *)cookie;
 192         dxp->ndescs = needed;
 193
 194         start_dp = vq->vq_ring.desc;
 195         start_dp[idx].addr =
 196                 VIRTIO_MBUF_ADDR(cookie, vq) +
 197                 RTE_PKTMBUF_HEADROOM - hw->vtnet_hdr_size;
 198         start_dp[idx].len =
 199                 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
 200         start_dp[idx].flags =  VRING_DESC_F_WRITE;
 201         idx = start_dp[idx].next;
 202         vq->vq_desc_head_idx = idx;
 203         if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 204                 vq->vq_desc_tail_idx = idx;
 205         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 206         vq_update_avail_ring(vq, head_idx);
 207
 208         return 0;
 209 }
 210
 211 static inline void
 212 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 213                        uint16_t needed, int use_indirect, int can_push)
 214 {
 215         struct vq_desc_extra *dxp;
 216         struct virtqueue *vq = txvq->vq;
 217         struct vring_desc *start_dp;
 218         uint16_t seg_num = cookie->nb_segs;
 219         uint16_t head_idx, idx;
 220         uint16_t head_size = vq->hw->vtnet_hdr_size;
 221         unsigned long offs;
 222
 223         head_idx = vq->vq_desc_head_idx;
 224         idx = head_idx;
 225         dxp = &vq->vq_descx[idx];
 226         dxp->cookie = (void *)cookie;
 227         dxp->ndescs = needed;
 228
 229         start_dp = vq->vq_ring.desc;
 230
 231         if (can_push) {
 232                 /* put on zero'd transmit header (no offloads) */
 233                 void *hdr = rte_pktmbuf_prepend(cookie, head_size);
 234
 235                 memset(hdr, 0, head_size);
 236         } else if (use_indirect) {
 237                 /* setup tx ring slot to point to indirect
 238                  * descriptor list stored in reserved region.
 239                  *
 240                  * the first slot in indirect ring is already preset
 241                  * to point to the header in reserved region
 242                  */
 243                 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 244
 245                 offs = idx * sizeof(struct virtio_tx_region)
 246                         + offsetof(struct virtio_tx_region, tx_indir);
 247
 248                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem + offs;
 249                 start_dp[idx].len   = (seg_num + 1) * sizeof(struct vring_desc);
 250                 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
 251
 252                 /* loop below will fill in rest of the indirect elements */
 253                 start_dp = txr[idx].tx_indir;
 254                 idx = 1;
 255         } else {
 256                 /* setup first tx ring slot to point to header
 257                  * stored in reserved region.
 258                  */
 259                 offs = idx * sizeof(struct virtio_tx_region)
 260                         + offsetof(struct virtio_tx_region, tx_hdr);
 261
 262                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem + offs;
 263                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
 264                 start_dp[idx].flags = VRING_DESC_F_NEXT;
 265                 idx = start_dp[idx].next;
 266         }
 267
 268         do {
 269                 start_dp[idx].addr  = VIRTIO_MBUF_DATA_DMA_ADDR(cookie, vq);
 270                 start_dp[idx].len   = cookie->data_len;
 271                 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 272                 idx = start_dp[idx].next;
 273         } while ((cookie = cookie->next) != NULL);
 274
 275         if (use_indirect)
 276                 idx = vq->vq_ring.desc[head_idx].next;
 277
 278         vq->vq_desc_head_idx = idx;
 279         if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 280                 vq->vq_desc_tail_idx = idx;
 281         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 282         vq_update_avail_ring(vq, head_idx);
 283 }
 284
 285 static void
 286 virtio_dev_vring_start(struct virtqueue *vq)
 287 {
 288         int size = vq->vq_nentries;
 289         struct vring *vr = &vq->vq_ring;
 290         uint8_t *ring_mem = vq->vq_ring_virt_mem;
 291
 292         PMD_INIT_FUNC_TRACE();
 293
 294         /*
 295          * Reinitialise since virtio port might have been stopped and restarted
 296          */
 297         memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
 298         vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
 299         vq->vq_used_cons_idx = 0;
 300         vq->vq_desc_head_idx = 0;
 301         vq->vq_avail_idx = 0;
 302         vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
 303         vq->vq_free_cnt = vq->vq_nentries;
 304         memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
 305
 306         vring_desc_init(vr->desc, size);
 307
 308         /*
 309          * Disable device(host) interrupting guest
 310          */
 311         virtqueue_disable_intr(vq);
 312 }
 313
 314 void
 315 virtio_dev_cq_start(struct rte_eth_dev *dev)
 316 {
 317         struct virtio_hw *hw = dev->data->dev_private;
 318
 319         if (hw->cvq && hw->cvq->vq) {
 320                 virtio_dev_vring_start(hw->cvq->vq);
 321                 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
 322         }
 323 }
 324
 325 void
 326 virtio_dev_rxtx_start(struct rte_eth_dev *dev)
 327 {
 328         /*
 329          * Start receive and transmit vrings
 330          * -    Setup vring structure for all queues
 331          * -    Initialize descriptor for the rx vring
 332          * -    Allocate blank mbufs for the each rx descriptor
 333          *
 334          */
 335         uint16_t i;
 336         uint16_t desc_idx;
 337
 338         PMD_INIT_FUNC_TRACE();
 339
 340         /* Start rx vring. */
 341         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 342                 struct virtnet_rx *rxvq = dev->data->rx_queues[i];
 343                 struct virtqueue *vq = rxvq->vq;
 344                 int error, nbufs;
 345                 struct rte_mbuf *m;
 346
 347                 virtio_dev_vring_start(vq);
 348                 if (rxvq->mpool == NULL) {
 349                         rte_exit(EXIT_FAILURE,
 350                                 "Cannot allocate mbufs for rx virtqueue");
 351                 }
 352
 353                 /* Allocate blank mbufs for the each rx descriptor */
 354                 nbufs = 0;
 355                 error = ENOSPC;
 356
 357 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 358                 if (use_simple_rxtx) {
 359                         for (desc_idx = 0; desc_idx < vq->vq_nentries;
 360                              desc_idx++) {
 361                                 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
 362                                 vq->vq_ring.desc[desc_idx].flags =
 363                                         VRING_DESC_F_WRITE;
 364                         }
 365                 }
 366 #endif
 367                 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
 368                 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
 369                      desc_idx++) {
 370                         vq->sw_ring[vq->vq_nentries + desc_idx] =
 371                                 &rxvq->fake_mbuf;
 372                 }
 373
 374                 while (!virtqueue_full(vq)) {
 375                         m = rte_mbuf_raw_alloc(rxvq->mpool);
 376                         if (m == NULL)
 377                                 break;
 378
 379                         /******************************************
 380                         *         Enqueue allocated buffers        *
 381                         *******************************************/
 382 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 383                         if (use_simple_rxtx)
 384                                 error = virtqueue_enqueue_recv_refill_simple(vq, m);
 385                         else
 386 #endif
 387                                 error = virtqueue_enqueue_recv_refill(vq, m);
 388                         if (error) {
 389                                 rte_pktmbuf_free(m);
 390                                 break;
 391                         }
 392                         nbufs++;
 393                 }
 394
 395                 vq_update_avail_idx(vq);
 396
 397                 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
 398
 399                 VIRTQUEUE_DUMP(vq);
 400         }
 401
 402         /* Start tx vring. */
 403         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 404                 struct virtnet_tx *txvq = dev->data->tx_queues[i];
 405                 struct virtqueue *vq = txvq->vq;
 406
 407                 virtio_dev_vring_start(vq);
 408 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 409                 if (use_simple_rxtx) {
 410                         uint16_t mid_idx  = vq->vq_nentries >> 1;
 411
 412                         for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
 413                                 vq->vq_ring.avail->ring[desc_idx] =
 414                                         desc_idx + mid_idx;
 415                                 vq->vq_ring.desc[desc_idx + mid_idx].next =
 416                                         desc_idx;
 417                                 vq->vq_ring.desc[desc_idx + mid_idx].addr =
 418                                         txvq->virtio_net_hdr_mem +
 419                                         offsetof(struct virtio_tx_region, tx_hdr);
 420                                 vq->vq_ring.desc[desc_idx + mid_idx].len =
 421                                         vq->hw->vtnet_hdr_size;
 422                                 vq->vq_ring.desc[desc_idx + mid_idx].flags =
 423                                         VRING_DESC_F_NEXT;
 424                                 vq->vq_ring.desc[desc_idx].flags = 0;
 425                         }
 426                         for (desc_idx = mid_idx; desc_idx < vq->vq_nentries;
 427                              desc_idx++)
 428                                 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
 429                 }
 430 #endif
 431                 VIRTQUEUE_DUMP(vq);
 432         }
 433 }
 434
 435 int
 436 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
 437                         uint16_t queue_idx,
 438                         uint16_t nb_desc,
 439                         unsigned int socket_id,
 440                         __rte_unused const struct rte_eth_rxconf *rx_conf,
 441                         struct rte_mempool *mp)
 442 {
 443         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 444         struct virtnet_rx *rxvq;
 445         int ret;
 446
 447         PMD_INIT_FUNC_TRACE();
 448         ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
 449                         nb_desc, socket_id, (void **)&rxvq);
 450         if (ret < 0) {
 451                 PMD_INIT_LOG(ERR, "rvq initialization failed");
 452                 return ret;
 453         }
 454
 455         /* Create mempool for rx mbuf allocation */
 456         rxvq->mpool = mp;
 457
 458         dev->data->rx_queues[queue_idx] = rxvq;
 459
 460 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 461         virtio_rxq_vec_setup(rxvq);
 462 #endif
 463
 464         return 0;
 465 }
 466
 467 void
 468 virtio_dev_rx_queue_release(void *rxq)
 469 {
 470         struct virtnet_rx *rxvq = rxq;
 471         struct virtqueue *vq;
 472         const struct rte_memzone *mz;
 473
 474         if (rxvq == NULL)
 475                 return;
 476
 477         /*
 478          * rxvq is freed when vq is freed, and as mz should be freed after the
 479          * del_queue, so we reserve the mz pointer first.
 480          */
 481         vq = rxvq->vq;
 482         mz = rxvq->mz;
 483
 484         virtio_dev_queue_release(vq);
 485         rte_memzone_free(mz);
 486 }
 487
 488 /*
 489  * struct rte_eth_dev *dev: Used to update dev
 490  * uint16_t nb_desc: Defaults to values read from config space
 491  * unsigned int socket_id: Used to allocate memzone
 492  * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
 493  * uint16_t queue_idx: Just used as an index in dev txq list
 494  */
 495 int
 496 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 497                         uint16_t queue_idx,
 498                         uint16_t nb_desc,
 499                         unsigned int socket_id,
 500                         const struct rte_eth_txconf *tx_conf)
 501 {
 502         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 503
 504 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 505         struct virtio_hw *hw = dev->data->dev_private;
 506 #endif
 507         struct virtnet_tx *txvq;
 508         struct virtqueue *vq;
 509         uint16_t tx_free_thresh;
 510         int ret;
 511
 512         PMD_INIT_FUNC_TRACE();
 513
 514         if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS)
 515             != ETH_TXQ_FLAGS_NOXSUMS) {
 516                 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
 517                 return -EINVAL;
 518         }
 519
 520 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 521         /* Use simple rx/tx func if single segment and no offloads */
 522         if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
 523              !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
 524                 PMD_INIT_LOG(INFO, "Using simple rx/tx path");
 525                 dev->tx_pkt_burst = virtio_xmit_pkts_simple;
 526                 dev->rx_pkt_burst = virtio_recv_pkts_vec;
 527                 use_simple_rxtx = 1;
 528         }
 529 #endif
 530
 531         ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
 532                         nb_desc, socket_id, (void **)&txvq);
 533         if (ret < 0) {
 534                 PMD_INIT_LOG(ERR, "tvq initialization failed");
 535                 return ret;
 536         }
 537         vq = txvq->vq;
 538
 539         tx_free_thresh = tx_conf->tx_free_thresh;
 540         if (tx_free_thresh == 0)
 541                 tx_free_thresh =
 542                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
 543
 544         if (tx_free_thresh >= (vq->vq_nentries - 3)) {
 545                 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
 546                         "number of TX entries minus 3 (%u)."
 547                         " (tx_free_thresh=%u port=%u queue=%u)\n",
 548                         vq->vq_nentries - 3,
 549                         tx_free_thresh, dev->data->port_id, queue_idx);
 550                 return -EINVAL;
 551         }
 552
 553         vq->vq_free_thresh = tx_free_thresh;
 554
 555         dev->data->tx_queues[queue_idx] = txvq;
 556         return 0;
 557 }
 558
 559 void
 560 virtio_dev_tx_queue_release(void *txq)
 561 {
 562         struct virtnet_tx *txvq = txq;
 563         struct virtqueue *vq;
 564         const struct rte_memzone *mz;
 565         const struct rte_memzone *hdr_mz;
 566
 567         if (txvq == NULL)
 568                 return;
 569
 570         /*
 571          * txvq is freed when vq is freed, and as mz should be freed after the
 572          * del_queue, so we reserve the mz pointer first.
 573          */
 574         vq = txvq->vq;
 575         mz = txvq->mz;
 576         hdr_mz = txvq->virtio_net_hdr_mz;
 577
 578         virtio_dev_queue_release(vq);
 579         rte_memzone_free(mz);
 580         rte_memzone_free(hdr_mz);
 581 }
 582
 583 static void
 584 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
 585 {
 586         int error;
 587         /*
 588          * Requeue the discarded mbuf. This should always be
 589          * successful since it was just dequeued.
 590          */
 591         error = virtqueue_enqueue_recv_refill(vq, m);
 592         if (unlikely(error)) {
 593                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
 594                 rte_pktmbuf_free(m);
 595         }
 596 }
 597
 598 static void
 599 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
 600 {
 601         uint32_t s = mbuf->pkt_len;
 602         struct ether_addr *ea;
 603
 604         if (s == 64) {
 605                 stats->size_bins[1]++;
 606         } else if (s > 64 && s < 1024) {
 607                 uint32_t bin;
 608
 609                 /* count zeros, and offset into correct bin */
 610                 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
 611                 stats->size_bins[bin]++;
 612         } else {
 613                 if (s < 64)
 614                         stats->size_bins[0]++;
 615                 else if (s < 1519)
 616                         stats->size_bins[6]++;
 617                 else if (s >= 1519)
 618                         stats->size_bins[7]++;
 619         }
 620
 621         ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
 622         if (is_multicast_ether_addr(ea)) {
 623                 if (is_broadcast_ether_addr(ea))
 624                         stats->broadcast++;
 625                 else
 626                         stats->multicast++;
 627         }
 628 }
 629
 630 #define VIRTIO_MBUF_BURST_SZ 64
 631 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
 632 uint16_t
 633 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 634 {
 635         struct virtnet_rx *rxvq = rx_queue;
 636         struct virtqueue *vq = rxvq->vq;
 637         struct virtio_hw *hw;
 638         struct rte_mbuf *rxm, *new_mbuf;
 639         uint16_t nb_used, num, nb_rx;
 640         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 641         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 642         int error;
 643         uint32_t i, nb_enqueued;
 644         uint32_t hdr_size;
 645
 646         nb_used = VIRTQUEUE_NUSED(vq);
 647
 648         virtio_rmb();
 649
 650         num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
 651         num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
 652         if (likely(num > DESC_PER_CACHELINE))
 653                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
 654
 655         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
 656         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
 657
 658         hw = vq->hw;
 659         nb_rx = 0;
 660         nb_enqueued = 0;
 661         hdr_size = hw->vtnet_hdr_size;
 662
 663         for (i = 0; i < num ; i++) {
 664                 rxm = rcv_pkts[i];
 665
 666                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
 667
 668                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
 669                         PMD_RX_LOG(ERR, "Packet drop");
 670                         nb_enqueued++;
 671                         virtio_discard_rxbuf(vq, rxm);
 672                         rxvq->stats.errors++;
 673                         continue;
 674                 }
 675
 676                 rxm->port = rxvq->port_id;
 677                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 678                 rxm->ol_flags = 0;
 679                 rxm->vlan_tci = 0;
 680
 681                 rxm->nb_segs = 1;
 682                 rxm->next = NULL;
 683                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
 684                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
 685
 686                 if (hw->vlan_strip)
 687                         rte_vlan_strip(rxm);
 688
 689                 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
 690
 691                 rx_pkts[nb_rx++] = rxm;
 692
 693                 rxvq->stats.bytes += rx_pkts[nb_rx - 1]->pkt_len;
 694                 virtio_update_packet_stats(&rxvq->stats, rxm);
 695         }
 696
 697         rxvq->stats.packets += nb_rx;
 698
 699         /* Allocate new mbuf for the used descriptor */
 700         error = ENOSPC;
 701         while (likely(!virtqueue_full(vq))) {
 702                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
 703                 if (unlikely(new_mbuf == NULL)) {
 704                         struct rte_eth_dev *dev
 705                                 = &rte_eth_devices[rxvq->port_id];
 706                         dev->data->rx_mbuf_alloc_failed++;
 707                         break;
 708                 }
 709                 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
 710                 if (unlikely(error)) {
 711                         rte_pktmbuf_free(new_mbuf);
 712                         break;
 713                 }
 714                 nb_enqueued++;
 715         }
 716
 717         if (likely(nb_enqueued)) {
 718                 vq_update_avail_idx(vq);
 719
 720                 if (unlikely(virtqueue_kick_prepare(vq))) {
 721                         virtqueue_notify(vq);
 722                         PMD_RX_LOG(DEBUG, "Notified");
 723                 }
 724         }
 725
 726         return nb_rx;
 727 }
 728
 729 uint16_t
 730 virtio_recv_mergeable_pkts(void *rx_queue,
 731                         struct rte_mbuf **rx_pkts,
 732                         uint16_t nb_pkts)
 733 {
 734         struct virtnet_rx *rxvq = rx_queue;
 735         struct virtqueue *vq = rxvq->vq;
 736         struct virtio_hw *hw;
 737         struct rte_mbuf *rxm, *new_mbuf;
 738         uint16_t nb_used, num, nb_rx;
 739         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 740         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 741         struct rte_mbuf *prev;
 742         int error;
 743         uint32_t i, nb_enqueued;
 744         uint32_t seg_num;
 745         uint16_t extra_idx;
 746         uint32_t seg_res;
 747         uint32_t hdr_size;
 748
 749         nb_used = VIRTQUEUE_NUSED(vq);
 750
 751         virtio_rmb();
 752
 753         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
 754
 755         hw = vq->hw;
 756         nb_rx = 0;
 757         i = 0;
 758         nb_enqueued = 0;
 759         seg_num = 0;
 760         extra_idx = 0;
 761         seg_res = 0;
 762         hdr_size = hw->vtnet_hdr_size;
 763
 764         while (i < nb_used) {
 765                 struct virtio_net_hdr_mrg_rxbuf *header;
 766
 767                 if (nb_rx == nb_pkts)
 768                         break;
 769
 770                 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
 771                 if (num != 1)
 772                         continue;
 773
 774                 i++;
 775
 776                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
 777                 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
 778
 779                 rxm = rcv_pkts[0];
 780
 781                 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
 782                         PMD_RX_LOG(ERR, "Packet drop");
 783                         nb_enqueued++;
 784                         virtio_discard_rxbuf(vq, rxm);
 785                         rxvq->stats.errors++;
 786                         continue;
 787                 }
 788
 789                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
 790                         RTE_PKTMBUF_HEADROOM - hdr_size);
 791                 seg_num = header->num_buffers;
 792
 793                 if (seg_num == 0)
 794                         seg_num = 1;
 795
 796                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 797                 rxm->nb_segs = seg_num;
 798                 rxm->next = NULL;
 799                 rxm->ol_flags = 0;
 800                 rxm->vlan_tci = 0;
 801                 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
 802                 rxm->data_len = (uint16_t)(len[0] - hdr_size);
 803
 804                 rxm->port = rxvq->port_id;
 805                 rx_pkts[nb_rx] = rxm;
 806                 prev = rxm;
 807
 808                 seg_res = seg_num - 1;
 809
 810                 while (seg_res != 0) {
 811                         /*
 812                          * Get extra segments for current uncompleted packet.
 813                          */
 814                         uint16_t  rcv_cnt =
 815                                 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
 816                         if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
 817                                 uint32_t rx_num =
 818                                         virtqueue_dequeue_burst_rx(vq,
 819                                         rcv_pkts, len, rcv_cnt);
 820                                 i += rx_num;
 821                                 rcv_cnt = rx_num;
 822                         } else {
 823                                 PMD_RX_LOG(ERR,
 824                                            "No enough segments for packet.");
 825                                 nb_enqueued++;
 826                                 virtio_discard_rxbuf(vq, rxm);
 827                                 rxvq->stats.errors++;
 828                                 break;
 829                         }
 830
 831                         extra_idx = 0;
 832
 833                         while (extra_idx < rcv_cnt) {
 834                                 rxm = rcv_pkts[extra_idx];
 835
 836                                 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
 837                                 rxm->next = NULL;
 838                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
 839                                 rxm->data_len = (uint16_t)(len[extra_idx]);
 840
 841                                 if (prev)
 842                                         prev->next = rxm;
 843
 844                                 prev = rxm;
 845                                 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
 846                                 extra_idx++;
 847                         };
 848                         seg_res -= rcv_cnt;
 849                 }
 850
 851                 if (hw->vlan_strip)
 852                         rte_vlan_strip(rx_pkts[nb_rx]);
 853
 854                 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
 855                         rx_pkts[nb_rx]->data_len);
 856
 857                 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
 858                 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
 859                 nb_rx++;
 860         }
 861
 862         rxvq->stats.packets += nb_rx;
 863
 864         /* Allocate new mbuf for the used descriptor */
 865         error = ENOSPC;
 866         while (likely(!virtqueue_full(vq))) {
 867                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
 868                 if (unlikely(new_mbuf == NULL)) {
 869                         struct rte_eth_dev *dev
 870                                 = &rte_eth_devices[rxvq->port_id];
 871                         dev->data->rx_mbuf_alloc_failed++;
 872                         break;
 873                 }
 874                 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
 875                 if (unlikely(error)) {
 876                         rte_pktmbuf_free(new_mbuf);
 877                         break;
 878                 }
 879                 nb_enqueued++;
 880         }
 881
 882         if (likely(nb_enqueued)) {
 883                 vq_update_avail_idx(vq);
 884
 885                 if (unlikely(virtqueue_kick_prepare(vq))) {
 886                         virtqueue_notify(vq);
 887                         PMD_RX_LOG(DEBUG, "Notified");
 888                 }
 889         }
 890
 891         return nb_rx;
 892 }
 893
 894 uint16_t
 895 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 896 {
 897         struct virtnet_tx *txvq = tx_queue;
 898         struct virtqueue *vq = txvq->vq;
 899         struct virtio_hw *hw = vq->hw;
 900         uint16_t hdr_size = hw->vtnet_hdr_size;
 901         uint16_t nb_used, nb_tx;
 902         int error;
 903
 904         if (unlikely(nb_pkts < 1))
 905                 return nb_pkts;
 906
 907         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
 908         nb_used = VIRTQUEUE_NUSED(vq);
 909
 910         virtio_rmb();
 911         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
 912                 virtio_xmit_cleanup(vq, nb_used);
 913
 914         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
 915                 struct rte_mbuf *txm = tx_pkts[nb_tx];
 916                 int can_push = 0, use_indirect = 0, slots, need;
 917
 918                 /* Do VLAN tag insertion */
 919                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
 920                         error = rte_vlan_insert(&txm);
 921                         if (unlikely(error)) {
 922                                 rte_pktmbuf_free(txm);
 923                                 continue;
 924                         }
 925                 }
 926
 927                 /* optimize ring usage */
 928                 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
 929                     rte_mbuf_refcnt_read(txm) == 1 &&
 930                     RTE_MBUF_DIRECT(txm) &&
 931                     txm->nb_segs == 1 &&
 932                     rte_pktmbuf_headroom(txm) >= hdr_size &&
 933                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
 934                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
 935                         can_push = 1;
 936                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
 937                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
 938                         use_indirect = 1;
 939
 940                 /* How many main ring entries are needed to this Tx?
 941                  * any_layout => number of segments
 942                  * indirect   => 1
 943                  * default    => number of segments + 1
 944                  */
 945                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
 946                 need = slots - vq->vq_free_cnt;
 947
 948                 /* Positive value indicates it need free vring descriptors */
 949                 if (unlikely(need > 0)) {
 950                         nb_used = VIRTQUEUE_NUSED(vq);
 951                         virtio_rmb();
 952                         need = RTE_MIN(need, (int)nb_used);
 953
 954                         virtio_xmit_cleanup(vq, need);
 955                         need = slots - vq->vq_free_cnt;
 956                         if (unlikely(need > 0)) {
 957                                 PMD_TX_LOG(ERR,
 958                                            "No free tx descriptors to transmit");
 959                                 break;
 960                         }
 961                 }
 962
 963                 /* Enqueue Packet buffers */
 964                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
 965
 966                 txvq->stats.bytes += txm->pkt_len;
 967                 virtio_update_packet_stats(&txvq->stats, txm);
 968         }
 969
 970         txvq->stats.packets += nb_tx;
 971
 972         if (likely(nb_tx)) {
 973                 vq_update_avail_idx(vq);
 974
 975                 if (unlikely(virtqueue_kick_prepare(vq))) {
 976                         virtqueue_notify(vq);
 977                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
 978                 }
 979         }
 980
 981         return nb_tx;
 982 }