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                 MBUF_DATA_DMA_ADDR(cookie, vq->offset) - hw->vtnet_hdr_size;
 197         start_dp[idx].len =
 198                 cookie->buf_len - RTE_PKTMBUF_HEADROOM + hw->vtnet_hdr_size;
 199         start_dp[idx].flags =  VRING_DESC_F_WRITE;
 200         idx = start_dp[idx].next;
 201         vq->vq_desc_head_idx = idx;
 202         if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 203                 vq->vq_desc_tail_idx = idx;
 204         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 205         vq_update_avail_ring(vq, head_idx);
 206
 207         return 0;
 208 }
 209
 210 static inline void
 211 virtqueue_enqueue_xmit(struct virtnet_tx *txvq, struct rte_mbuf *cookie,
 212                        uint16_t needed, int use_indirect, int can_push)
 213 {
 214         struct vq_desc_extra *dxp;
 215         struct virtqueue *vq = txvq->vq;
 216         struct vring_desc *start_dp;
 217         uint16_t seg_num = cookie->nb_segs;
 218         uint16_t head_idx, idx;
 219         uint16_t head_size = vq->hw->vtnet_hdr_size;
 220         unsigned long offs;
 221
 222         head_idx = vq->vq_desc_head_idx;
 223         idx = head_idx;
 224         dxp = &vq->vq_descx[idx];
 225         dxp->cookie = (void *)cookie;
 226         dxp->ndescs = needed;
 227
 228         start_dp = vq->vq_ring.desc;
 229
 230         if (can_push) {
 231                 /* put on zero'd transmit header (no offloads) */
 232                 void *hdr = rte_pktmbuf_prepend(cookie, head_size);
 233
 234                 memset(hdr, 0, head_size);
 235         } else if (use_indirect) {
 236                 /* setup tx ring slot to point to indirect
 237                  * descriptor list stored in reserved region.
 238                  *
 239                  * the first slot in indirect ring is already preset
 240                  * to point to the header in reserved region
 241                  */
 242                 struct virtio_tx_region *txr = txvq->virtio_net_hdr_mz->addr;
 243
 244                 offs = idx * sizeof(struct virtio_tx_region)
 245                         + offsetof(struct virtio_tx_region, tx_indir);
 246
 247                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem + offs;
 248                 start_dp[idx].len   = (seg_num + 1) * sizeof(struct vring_desc);
 249                 start_dp[idx].flags = VRING_DESC_F_INDIRECT;
 250
 251                 /* loop below will fill in rest of the indirect elements */
 252                 start_dp = txr[idx].tx_indir;
 253                 idx = 1;
 254         } else {
 255                 /* setup first tx ring slot to point to header
 256                  * stored in reserved region.
 257                  */
 258                 offs = idx * sizeof(struct virtio_tx_region)
 259                         + offsetof(struct virtio_tx_region, tx_hdr);
 260
 261                 start_dp[idx].addr  = txvq->virtio_net_hdr_mem + offs;
 262                 start_dp[idx].len   = vq->hw->vtnet_hdr_size;
 263                 start_dp[idx].flags = VRING_DESC_F_NEXT;
 264                 idx = start_dp[idx].next;
 265         }
 266
 267         do {
 268                 start_dp[idx].addr  = MBUF_DATA_DMA_ADDR(cookie, vq->offset);
 269                 start_dp[idx].len   = cookie->data_len;
 270                 start_dp[idx].flags = cookie->next ? VRING_DESC_F_NEXT : 0;
 271                 idx = start_dp[idx].next;
 272         } while ((cookie = cookie->next) != NULL);
 273
 274         if (use_indirect)
 275                 idx = vq->vq_ring.desc[head_idx].next;
 276
 277         vq->vq_desc_head_idx = idx;
 278         if (vq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 279                 vq->vq_desc_tail_idx = idx;
 280         vq->vq_free_cnt = (uint16_t)(vq->vq_free_cnt - needed);
 281         vq_update_avail_ring(vq, head_idx);
 282 }
 283
 284 static void
 285 virtio_dev_vring_start(struct virtqueue *vq)
 286 {
 287         int size = vq->vq_nentries;
 288         struct vring *vr = &vq->vq_ring;
 289         uint8_t *ring_mem = vq->vq_ring_virt_mem;
 290
 291         PMD_INIT_FUNC_TRACE();
 292
 293         /*
 294          * Reinitialise since virtio port might have been stopped and restarted
 295          */
 296         memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
 297         vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
 298         vq->vq_used_cons_idx = 0;
 299         vq->vq_desc_head_idx = 0;
 300         vq->vq_avail_idx = 0;
 301         vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
 302         vq->vq_free_cnt = vq->vq_nentries;
 303         memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
 304
 305         vring_desc_init(vr->desc, size);
 306
 307         /*
 308          * Disable device(host) interrupting guest
 309          */
 310         virtqueue_disable_intr(vq);
 311 }
 312
 313 void
 314 virtio_dev_cq_start(struct rte_eth_dev *dev)
 315 {
 316         struct virtio_hw *hw = dev->data->dev_private;
 317
 318         if (hw->cvq && hw->cvq->vq) {
 319                 virtio_dev_vring_start(hw->cvq->vq);
 320                 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq->vq);
 321         }
 322 }
 323
 324 void
 325 virtio_dev_rxtx_start(struct rte_eth_dev *dev)
 326 {
 327         /*
 328          * Start receive and transmit vrings
 329          * -    Setup vring structure for all queues
 330          * -    Initialize descriptor for the rx vring
 331          * -    Allocate blank mbufs for the each rx descriptor
 332          *
 333          */
 334         uint16_t i;
 335         uint16_t desc_idx;
 336
 337         PMD_INIT_FUNC_TRACE();
 338
 339         /* Start rx vring. */
 340         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 341                 struct virtnet_rx *rxvq = dev->data->rx_queues[i];
 342                 struct virtqueue *vq = rxvq->vq;
 343                 int error, nbufs;
 344                 struct rte_mbuf *m;
 345
 346                 virtio_dev_vring_start(vq);
 347                 if (rxvq->mpool == NULL) {
 348                         rte_exit(EXIT_FAILURE,
 349                                 "Cannot allocate mbufs for rx virtqueue");
 350                 }
 351
 352                 /* Allocate blank mbufs for the each rx descriptor */
 353                 nbufs = 0;
 354                 error = ENOSPC;
 355
 356 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 357                 if (use_simple_rxtx) {
 358                         for (desc_idx = 0; desc_idx < vq->vq_nentries;
 359                              desc_idx++) {
 360                                 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
 361                                 vq->vq_ring.desc[desc_idx].flags =
 362                                         VRING_DESC_F_WRITE;
 363                         }
 364                 }
 365 #endif
 366                 memset(&rxvq->fake_mbuf, 0, sizeof(rxvq->fake_mbuf));
 367                 for (desc_idx = 0; desc_idx < RTE_PMD_VIRTIO_RX_MAX_BURST;
 368                      desc_idx++) {
 369                         vq->sw_ring[vq->vq_nentries + desc_idx] =
 370                                 &rxvq->fake_mbuf;
 371                 }
 372
 373                 while (!virtqueue_full(vq)) {
 374                         m = rte_mbuf_raw_alloc(rxvq->mpool);
 375                         if (m == NULL)
 376                                 break;
 377
 378                         /******************************************
 379                         *         Enqueue allocated buffers        *
 380                         *******************************************/
 381 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 382                         if (use_simple_rxtx)
 383                                 error = virtqueue_enqueue_recv_refill_simple(vq, m);
 384                         else
 385 #endif
 386                                 error = virtqueue_enqueue_recv_refill(vq, m);
 387                         if (error) {
 388                                 rte_pktmbuf_free(m);
 389                                 break;
 390                         }
 391                         nbufs++;
 392                 }
 393
 394                 vq_update_avail_idx(vq);
 395
 396                 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
 397
 398                 VIRTQUEUE_DUMP(vq);
 399         }
 400
 401         /* Start tx vring. */
 402         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 403                 struct virtnet_tx *txvq = dev->data->tx_queues[i];
 404                 struct virtqueue *vq = txvq->vq;
 405
 406                 virtio_dev_vring_start(vq);
 407 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 408                 if (use_simple_rxtx) {
 409                         uint16_t mid_idx  = vq->vq_nentries >> 1;
 410
 411                         for (desc_idx = 0; desc_idx < mid_idx; desc_idx++) {
 412                                 vq->vq_ring.avail->ring[desc_idx] =
 413                                         desc_idx + mid_idx;
 414                                 vq->vq_ring.desc[desc_idx + mid_idx].next =
 415                                         desc_idx;
 416                                 vq->vq_ring.desc[desc_idx + mid_idx].addr =
 417                                         txvq->virtio_net_hdr_mem +
 418                                         offsetof(struct virtio_tx_region, tx_hdr);
 419                                 vq->vq_ring.desc[desc_idx + mid_idx].len =
 420                                         vq->hw->vtnet_hdr_size;
 421                                 vq->vq_ring.desc[desc_idx + mid_idx].flags =
 422                                         VRING_DESC_F_NEXT;
 423                                 vq->vq_ring.desc[desc_idx].flags = 0;
 424                         }
 425                         for (desc_idx = mid_idx; desc_idx < vq->vq_nentries;
 426                              desc_idx++)
 427                                 vq->vq_ring.avail->ring[desc_idx] = desc_idx;
 428                 }
 429 #endif
 430                 VIRTQUEUE_DUMP(vq);
 431         }
 432 }
 433
 434 int
 435 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
 436                         uint16_t queue_idx,
 437                         uint16_t nb_desc,
 438                         unsigned int socket_id,
 439                         __rte_unused const struct rte_eth_rxconf *rx_conf,
 440                         struct rte_mempool *mp)
 441 {
 442         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 443         struct virtnet_rx *rxvq;
 444         int ret;
 445
 446         PMD_INIT_FUNC_TRACE();
 447         ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
 448                         nb_desc, socket_id, (void **)&rxvq);
 449         if (ret < 0) {
 450                 PMD_INIT_LOG(ERR, "rvq initialization failed");
 451                 return ret;
 452         }
 453
 454         /* Create mempool for rx mbuf allocation */
 455         rxvq->mpool = mp;
 456
 457         dev->data->rx_queues[queue_idx] = rxvq;
 458
 459 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 460         virtio_rxq_vec_setup(rxvq);
 461 #endif
 462
 463         return 0;
 464 }
 465
 466 void
 467 virtio_dev_rx_queue_release(void *rxq)
 468 {
 469         struct virtnet_rx *rxvq = rxq;
 470         struct virtqueue *vq = rxvq->vq;
 471         /* rxvq is freed when vq is freed, and as mz should be freed after the
 472          * del_queue, so we reserve the mz pointer first.
 473          */
 474         const struct rte_memzone *mz = rxvq->mz;
 475
 476         /* no need to free rxq as vq and rxq are allocated together */
 477         virtio_dev_queue_release(vq);
 478         rte_memzone_free(mz);
 479 }
 480
 481 /*
 482  * struct rte_eth_dev *dev: Used to update dev
 483  * uint16_t nb_desc: Defaults to values read from config space
 484  * unsigned int socket_id: Used to allocate memzone
 485  * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
 486  * uint16_t queue_idx: Just used as an index in dev txq list
 487  */
 488 int
 489 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 490                         uint16_t queue_idx,
 491                         uint16_t nb_desc,
 492                         unsigned int socket_id,
 493                         const struct rte_eth_txconf *tx_conf)
 494 {
 495         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 496
 497 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 498         struct virtio_hw *hw = dev->data->dev_private;
 499 #endif
 500         struct virtnet_tx *txvq;
 501         struct virtqueue *vq;
 502         uint16_t tx_free_thresh;
 503         int ret;
 504
 505         PMD_INIT_FUNC_TRACE();
 506
 507         if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS)
 508             != ETH_TXQ_FLAGS_NOXSUMS) {
 509                 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
 510                 return -EINVAL;
 511         }
 512
 513 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 514         /* Use simple rx/tx func if single segment and no offloads */
 515         if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
 516              !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
 517                 PMD_INIT_LOG(INFO, "Using simple rx/tx path");
 518                 dev->tx_pkt_burst = virtio_xmit_pkts_simple;
 519                 dev->rx_pkt_burst = virtio_recv_pkts_vec;
 520                 use_simple_rxtx = 1;
 521         }
 522 #endif
 523
 524         ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
 525                         nb_desc, socket_id, (void **)&txvq);
 526         if (ret < 0) {
 527                 PMD_INIT_LOG(ERR, "tvq initialization failed");
 528                 return ret;
 529         }
 530         vq = txvq->vq;
 531
 532         tx_free_thresh = tx_conf->tx_free_thresh;
 533         if (tx_free_thresh == 0)
 534                 tx_free_thresh =
 535                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
 536
 537         if (tx_free_thresh >= (vq->vq_nentries - 3)) {
 538                 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
 539                         "number of TX entries minus 3 (%u)."
 540                         " (tx_free_thresh=%u port=%u queue=%u)\n",
 541                         vq->vq_nentries - 3,
 542                         tx_free_thresh, dev->data->port_id, queue_idx);
 543                 return -EINVAL;
 544         }
 545
 546         vq->vq_free_thresh = tx_free_thresh;
 547
 548         dev->data->tx_queues[queue_idx] = txvq;
 549         return 0;
 550 }
 551
 552 void
 553 virtio_dev_tx_queue_release(void *txq)
 554 {
 555         struct virtnet_tx *txvq = txq;
 556         struct virtqueue *vq = txvq->vq;
 557         /* txvq is freed when vq is freed, and as mz should be freed after the
 558          * del_queue, so we reserve the mz pointer first.
 559          */
 560         const struct rte_memzone *hdr_mz = txvq->virtio_net_hdr_mz;
 561         const struct rte_memzone *mz = txvq->mz;
 562
 563         virtio_dev_queue_release(vq);
 564         rte_memzone_free(mz);
 565         rte_memzone_free(hdr_mz);
 566 }
 567
 568 static void
 569 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
 570 {
 571         int error;
 572         /*
 573          * Requeue the discarded mbuf. This should always be
 574          * successful since it was just dequeued.
 575          */
 576         error = virtqueue_enqueue_recv_refill(vq, m);
 577         if (unlikely(error)) {
 578                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
 579                 rte_pktmbuf_free(m);
 580         }
 581 }
 582
 583 static void
 584 virtio_update_packet_stats(struct virtnet_stats *stats, struct rte_mbuf *mbuf)
 585 {
 586         uint32_t s = mbuf->pkt_len;
 587         struct ether_addr *ea;
 588
 589         if (s == 64) {
 590                 stats->size_bins[1]++;
 591         } else if (s > 64 && s < 1024) {
 592                 uint32_t bin;
 593
 594                 /* count zeros, and offset into correct bin */
 595                 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
 596                 stats->size_bins[bin]++;
 597         } else {
 598                 if (s < 64)
 599                         stats->size_bins[0]++;
 600                 else if (s < 1519)
 601                         stats->size_bins[6]++;
 602                 else if (s >= 1519)
 603                         stats->size_bins[7]++;
 604         }
 605
 606         ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
 607         if (is_multicast_ether_addr(ea)) {
 608                 if (is_broadcast_ether_addr(ea))
 609                         stats->broadcast++;
 610                 else
 611                         stats->multicast++;
 612         }
 613 }
 614
 615 #define VIRTIO_MBUF_BURST_SZ 64
 616 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
 617 uint16_t
 618 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 619 {
 620         struct virtnet_rx *rxvq = rx_queue;
 621         struct virtqueue *vq = rxvq->vq;
 622         struct virtio_hw *hw;
 623         struct rte_mbuf *rxm, *new_mbuf;
 624         uint16_t nb_used, num, nb_rx;
 625         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 626         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 627         int error;
 628         uint32_t i, nb_enqueued;
 629         uint32_t hdr_size;
 630
 631         nb_used = VIRTQUEUE_NUSED(vq);
 632
 633         virtio_rmb();
 634
 635         num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
 636         num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
 637         if (likely(num > DESC_PER_CACHELINE))
 638                 num = num - ((vq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
 639
 640         num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, num);
 641         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
 642
 643         hw = vq->hw;
 644         nb_rx = 0;
 645         nb_enqueued = 0;
 646         hdr_size = hw->vtnet_hdr_size;
 647
 648         for (i = 0; i < num ; i++) {
 649                 rxm = rcv_pkts[i];
 650
 651                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
 652
 653                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
 654                         PMD_RX_LOG(ERR, "Packet drop");
 655                         nb_enqueued++;
 656                         virtio_discard_rxbuf(vq, rxm);
 657                         rxvq->stats.errors++;
 658                         continue;
 659                 }
 660
 661                 rxm->port = rxvq->port_id;
 662                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 663                 rxm->ol_flags = 0;
 664                 rxm->vlan_tci = 0;
 665
 666                 rxm->nb_segs = 1;
 667                 rxm->next = NULL;
 668                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
 669                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
 670
 671                 if (hw->vlan_strip)
 672                         rte_vlan_strip(rxm);
 673
 674                 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
 675
 676                 rx_pkts[nb_rx++] = rxm;
 677
 678                 rxvq->stats.bytes += rx_pkts[nb_rx - 1]->pkt_len;
 679                 virtio_update_packet_stats(&rxvq->stats, rxm);
 680         }
 681
 682         rxvq->stats.packets += nb_rx;
 683
 684         /* Allocate new mbuf for the used descriptor */
 685         error = ENOSPC;
 686         while (likely(!virtqueue_full(vq))) {
 687                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
 688                 if (unlikely(new_mbuf == NULL)) {
 689                         struct rte_eth_dev *dev
 690                                 = &rte_eth_devices[rxvq->port_id];
 691                         dev->data->rx_mbuf_alloc_failed++;
 692                         break;
 693                 }
 694                 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
 695                 if (unlikely(error)) {
 696                         rte_pktmbuf_free(new_mbuf);
 697                         break;
 698                 }
 699                 nb_enqueued++;
 700         }
 701
 702         if (likely(nb_enqueued)) {
 703                 vq_update_avail_idx(vq);
 704
 705                 if (unlikely(virtqueue_kick_prepare(vq))) {
 706                         virtqueue_notify(vq);
 707                         PMD_RX_LOG(DEBUG, "Notified");
 708                 }
 709         }
 710
 711         return nb_rx;
 712 }
 713
 714 uint16_t
 715 virtio_recv_mergeable_pkts(void *rx_queue,
 716                         struct rte_mbuf **rx_pkts,
 717                         uint16_t nb_pkts)
 718 {
 719         struct virtnet_rx *rxvq = rx_queue;
 720         struct virtqueue *vq = rxvq->vq;
 721         struct virtio_hw *hw;
 722         struct rte_mbuf *rxm, *new_mbuf;
 723         uint16_t nb_used, num, nb_rx;
 724         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 725         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 726         struct rte_mbuf *prev;
 727         int error;
 728         uint32_t i, nb_enqueued;
 729         uint32_t seg_num;
 730         uint16_t extra_idx;
 731         uint32_t seg_res;
 732         uint32_t hdr_size;
 733
 734         nb_used = VIRTQUEUE_NUSED(vq);
 735
 736         virtio_rmb();
 737
 738         PMD_RX_LOG(DEBUG, "used:%d", nb_used);
 739
 740         hw = vq->hw;
 741         nb_rx = 0;
 742         i = 0;
 743         nb_enqueued = 0;
 744         seg_num = 0;
 745         extra_idx = 0;
 746         seg_res = 0;
 747         hdr_size = hw->vtnet_hdr_size;
 748
 749         while (i < nb_used) {
 750                 struct virtio_net_hdr_mrg_rxbuf *header;
 751
 752                 if (nb_rx == nb_pkts)
 753                         break;
 754
 755                 num = virtqueue_dequeue_burst_rx(vq, rcv_pkts, len, 1);
 756                 if (num != 1)
 757                         continue;
 758
 759                 i++;
 760
 761                 PMD_RX_LOG(DEBUG, "dequeue:%d", num);
 762                 PMD_RX_LOG(DEBUG, "packet len:%d", len[0]);
 763
 764                 rxm = rcv_pkts[0];
 765
 766                 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
 767                         PMD_RX_LOG(ERR, "Packet drop");
 768                         nb_enqueued++;
 769                         virtio_discard_rxbuf(vq, rxm);
 770                         rxvq->stats.errors++;
 771                         continue;
 772                 }
 773
 774                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
 775                         RTE_PKTMBUF_HEADROOM - hdr_size);
 776                 seg_num = header->num_buffers;
 777
 778                 if (seg_num == 0)
 779                         seg_num = 1;
 780
 781                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 782                 rxm->nb_segs = seg_num;
 783                 rxm->next = NULL;
 784                 rxm->ol_flags = 0;
 785                 rxm->vlan_tci = 0;
 786                 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
 787                 rxm->data_len = (uint16_t)(len[0] - hdr_size);
 788
 789                 rxm->port = rxvq->port_id;
 790                 rx_pkts[nb_rx] = rxm;
 791                 prev = rxm;
 792
 793                 seg_res = seg_num - 1;
 794
 795                 while (seg_res != 0) {
 796                         /*
 797                          * Get extra segments for current uncompleted packet.
 798                          */
 799                         uint16_t  rcv_cnt =
 800                                 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
 801                         if (likely(VIRTQUEUE_NUSED(vq) >= rcv_cnt)) {
 802                                 uint32_t rx_num =
 803                                         virtqueue_dequeue_burst_rx(vq,
 804                                         rcv_pkts, len, rcv_cnt);
 805                                 i += rx_num;
 806                                 rcv_cnt = rx_num;
 807                         } else {
 808                                 PMD_RX_LOG(ERR,
 809                                            "No enough segments for packet.");
 810                                 nb_enqueued++;
 811                                 virtio_discard_rxbuf(vq, rxm);
 812                                 rxvq->stats.errors++;
 813                                 break;
 814                         }
 815
 816                         extra_idx = 0;
 817
 818                         while (extra_idx < rcv_cnt) {
 819                                 rxm = rcv_pkts[extra_idx];
 820
 821                                 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
 822                                 rxm->next = NULL;
 823                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
 824                                 rxm->data_len = (uint16_t)(len[extra_idx]);
 825
 826                                 if (prev)
 827                                         prev->next = rxm;
 828
 829                                 prev = rxm;
 830                                 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
 831                                 extra_idx++;
 832                         };
 833                         seg_res -= rcv_cnt;
 834                 }
 835
 836                 if (hw->vlan_strip)
 837                         rte_vlan_strip(rx_pkts[nb_rx]);
 838
 839                 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
 840                         rx_pkts[nb_rx]->data_len);
 841
 842                 rxvq->stats.bytes += rx_pkts[nb_rx]->pkt_len;
 843                 virtio_update_packet_stats(&rxvq->stats, rx_pkts[nb_rx]);
 844                 nb_rx++;
 845         }
 846
 847         rxvq->stats.packets += nb_rx;
 848
 849         /* Allocate new mbuf for the used descriptor */
 850         error = ENOSPC;
 851         while (likely(!virtqueue_full(vq))) {
 852                 new_mbuf = rte_mbuf_raw_alloc(rxvq->mpool);
 853                 if (unlikely(new_mbuf == NULL)) {
 854                         struct rte_eth_dev *dev
 855                                 = &rte_eth_devices[rxvq->port_id];
 856                         dev->data->rx_mbuf_alloc_failed++;
 857                         break;
 858                 }
 859                 error = virtqueue_enqueue_recv_refill(vq, new_mbuf);
 860                 if (unlikely(error)) {
 861                         rte_pktmbuf_free(new_mbuf);
 862                         break;
 863                 }
 864                 nb_enqueued++;
 865         }
 866
 867         if (likely(nb_enqueued)) {
 868                 vq_update_avail_idx(vq);
 869
 870                 if (unlikely(virtqueue_kick_prepare(vq))) {
 871                         virtqueue_notify(vq);
 872                         PMD_RX_LOG(DEBUG, "Notified");
 873                 }
 874         }
 875
 876         return nb_rx;
 877 }
 878
 879 uint16_t
 880 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 881 {
 882         struct virtnet_tx *txvq = tx_queue;
 883         struct virtqueue *vq = txvq->vq;
 884         struct virtio_hw *hw = vq->hw;
 885         uint16_t hdr_size = hw->vtnet_hdr_size;
 886         uint16_t nb_used, nb_tx;
 887         int error;
 888
 889         if (unlikely(nb_pkts < 1))
 890                 return nb_pkts;
 891
 892         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
 893         nb_used = VIRTQUEUE_NUSED(vq);
 894
 895         virtio_rmb();
 896         if (likely(nb_used > vq->vq_nentries - vq->vq_free_thresh))
 897                 virtio_xmit_cleanup(vq, nb_used);
 898
 899         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
 900                 struct rte_mbuf *txm = tx_pkts[nb_tx];
 901                 int can_push = 0, use_indirect = 0, slots, need;
 902
 903                 /* Do VLAN tag insertion */
 904                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
 905                         error = rte_vlan_insert(&txm);
 906                         if (unlikely(error)) {
 907                                 rte_pktmbuf_free(txm);
 908                                 continue;
 909                         }
 910                 }
 911
 912                 /* optimize ring usage */
 913                 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
 914                     rte_mbuf_refcnt_read(txm) == 1 &&
 915                     RTE_MBUF_DIRECT(txm) &&
 916                     txm->nb_segs == 1 &&
 917                     rte_pktmbuf_headroom(txm) >= hdr_size &&
 918                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
 919                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
 920                         can_push = 1;
 921                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
 922                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
 923                         use_indirect = 1;
 924
 925                 /* How many main ring entries are needed to this Tx?
 926                  * any_layout => number of segments
 927                  * indirect   => 1
 928                  * default    => number of segments + 1
 929                  */
 930                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
 931                 need = slots - vq->vq_free_cnt;
 932
 933                 /* Positive value indicates it need free vring descriptors */
 934                 if (unlikely(need > 0)) {
 935                         nb_used = VIRTQUEUE_NUSED(vq);
 936                         virtio_rmb();
 937                         need = RTE_MIN(need, (int)nb_used);
 938
 939                         virtio_xmit_cleanup(vq, need);
 940                         need = slots - vq->vq_free_cnt;
 941                         if (unlikely(need > 0)) {
 942                                 PMD_TX_LOG(ERR,
 943                                            "No free tx descriptors to transmit");
 944                                 break;
 945                         }
 946                 }
 947
 948                 /* Enqueue Packet buffers */
 949                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
 950
 951                 txvq->stats.bytes += txm->pkt_len;
 952                 virtio_update_packet_stats(&txvq->stats, txm);
 953         }
 954
 955         txvq->stats.packets += nb_tx;
 956
 957         if (likely(nb_tx)) {
 958                 vq_update_avail_idx(vq);
 959
 960                 if (unlikely(virtqueue_kick_prepare(vq))) {
 961                         virtqueue_notify(vq);
 962                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
 963                 }
 964         }
 965
 966         return nb_tx;
 967 }