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                 (uint64_t)(cookie->buf_physaddr + RTE_PKTMBUF_HEADROOM
 197                 - 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 virtqueue *txvq, struct rte_mbuf *cookie,
 213                        uint16_t needed, int use_indirect, int can_push)
 214 {
 215         struct vq_desc_extra *dxp;
 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 = txvq->hw->vtnet_hdr_size;
 220         unsigned long offs;
 221
 222         head_idx = txvq->vq_desc_head_idx;
 223         idx = head_idx;
 224         dxp = &txvq->vq_descx[idx];
 225         dxp->cookie = (void *)cookie;
 226         dxp->ndescs = needed;
 227
 228         start_dp = txvq->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   = txvq->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  = rte_mbuf_data_dma_addr(cookie);
 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         start_dp[idx].flags &= ~VRING_DESC_F_NEXT;
 275
 276         if (use_indirect)
 277                 idx = txvq->vq_ring.desc[head_idx].next;
 278
 279         txvq->vq_desc_head_idx = idx;
 280         if (txvq->vq_desc_head_idx == VQ_RING_DESC_CHAIN_END)
 281                 txvq->vq_desc_tail_idx = idx;
 282         txvq->vq_free_cnt = (uint16_t)(txvq->vq_free_cnt - needed);
 283         vq_update_avail_ring(txvq, head_idx);
 284 }
 285
 286 static inline struct rte_mbuf *
 287 rte_rxmbuf_alloc(struct rte_mempool *mp)
 288 {
 289         struct rte_mbuf *m;
 290
 291         m = __rte_mbuf_raw_alloc(mp);
 292         __rte_mbuf_sanity_check_raw(m, 0);
 293
 294         return m;
 295 }
 296
 297 static void
 298 virtio_dev_vring_start(struct virtqueue *vq, int queue_type)
 299 {
 300         struct rte_mbuf *m;
 301         int i, nbufs, error, size = vq->vq_nentries;
 302         struct vring *vr = &vq->vq_ring;
 303         uint8_t *ring_mem = vq->vq_ring_virt_mem;
 304
 305         PMD_INIT_FUNC_TRACE();
 306
 307         /*
 308          * Reinitialise since virtio port might have been stopped and restarted
 309          */
 310         memset(vq->vq_ring_virt_mem, 0, vq->vq_ring_size);
 311         vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
 312         vq->vq_used_cons_idx = 0;
 313         vq->vq_desc_head_idx = 0;
 314         vq->vq_avail_idx = 0;
 315         vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
 316         vq->vq_free_cnt = vq->vq_nentries;
 317         memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
 318
 319         vring_desc_init(vr->desc, size);
 320
 321         /*
 322          * Disable device(host) interrupting guest
 323          */
 324         virtqueue_disable_intr(vq);
 325
 326         /* Only rx virtqueue needs mbufs to be allocated at initialization */
 327         if (queue_type == VTNET_RQ) {
 328                 if (vq->mpool == NULL)
 329                         rte_exit(EXIT_FAILURE,
 330                         "Cannot allocate initial mbufs for rx virtqueue");
 331
 332                 /* Allocate blank mbufs for the each rx descriptor */
 333                 nbufs = 0;
 334                 error = ENOSPC;
 335
 336 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 337                 if (use_simple_rxtx)
 338                         for (i = 0; i < vq->vq_nentries; i++) {
 339                                 vq->vq_ring.avail->ring[i] = i;
 340                                 vq->vq_ring.desc[i].flags = VRING_DESC_F_WRITE;
 341                         }
 342 #endif
 343                 memset(&vq->fake_mbuf, 0, sizeof(vq->fake_mbuf));
 344                 for (i = 0; i < RTE_PMD_VIRTIO_RX_MAX_BURST; i++)
 345                         vq->sw_ring[vq->vq_nentries + i] = &vq->fake_mbuf;
 346
 347                 while (!virtqueue_full(vq)) {
 348                         m = rte_rxmbuf_alloc(vq->mpool);
 349                         if (m == NULL)
 350                                 break;
 351
 352                         /******************************************
 353                         *         Enqueue allocated buffers        *
 354                         *******************************************/
 355 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 356                         if (use_simple_rxtx)
 357                                 error = virtqueue_enqueue_recv_refill_simple(vq, m);
 358                         else
 359 #endif
 360                                 error = virtqueue_enqueue_recv_refill(vq, m);
 361                         if (error) {
 362                                 rte_pktmbuf_free(m);
 363                                 break;
 364                         }
 365                         nbufs++;
 366                 }
 367
 368                 vq_update_avail_idx(vq);
 369
 370                 PMD_INIT_LOG(DEBUG, "Allocated %d bufs", nbufs);
 371         } else if (queue_type == VTNET_TQ) {
 372 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 373                 if (use_simple_rxtx) {
 374                         int mid_idx  = vq->vq_nentries >> 1;
 375                         for (i = 0; i < mid_idx; i++) {
 376                                 vq->vq_ring.avail->ring[i] = i + mid_idx;
 377                                 vq->vq_ring.desc[i + mid_idx].next = i;
 378                                 vq->vq_ring.desc[i + mid_idx].addr =
 379                                         vq->virtio_net_hdr_mem +
 380                                         offsetof(struct virtio_tx_region, tx_hdr);
 381                                 vq->vq_ring.desc[i + mid_idx].len =
 382                                         vq->hw->vtnet_hdr_size;
 383                                 vq->vq_ring.desc[i + mid_idx].flags =
 384                                         VRING_DESC_F_NEXT;
 385                                 vq->vq_ring.desc[i].flags = 0;
 386                         }
 387                         for (i = mid_idx; i < vq->vq_nentries; i++)
 388                                 vq->vq_ring.avail->ring[i] = i;
 389                 }
 390 #endif
 391         }
 392 }
 393
 394 void
 395 virtio_dev_cq_start(struct rte_eth_dev *dev)
 396 {
 397         struct virtio_hw *hw = dev->data->dev_private;
 398
 399         if (hw->cvq) {
 400                 virtio_dev_vring_start(hw->cvq, VTNET_CQ);
 401                 VIRTQUEUE_DUMP((struct virtqueue *)hw->cvq);
 402         }
 403 }
 404
 405 void
 406 virtio_dev_rxtx_start(struct rte_eth_dev *dev)
 407 {
 408         /*
 409          * Start receive and transmit vrings
 410          * -    Setup vring structure for all queues
 411          * -    Initialize descriptor for the rx vring
 412          * -    Allocate blank mbufs for the each rx descriptor
 413          *
 414          */
 415         int i;
 416
 417         PMD_INIT_FUNC_TRACE();
 418
 419         /* Start rx vring. */
 420         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 421                 virtio_dev_vring_start(dev->data->rx_queues[i], VTNET_RQ);
 422                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->rx_queues[i]);
 423         }
 424
 425         /* Start tx vring. */
 426         for (i = 0; i < dev->data->nb_tx_queues; i++) {
 427                 virtio_dev_vring_start(dev->data->tx_queues[i], VTNET_TQ);
 428                 VIRTQUEUE_DUMP((struct virtqueue *)dev->data->tx_queues[i]);
 429         }
 430 }
 431
 432 int
 433 virtio_dev_rx_queue_setup(struct rte_eth_dev *dev,
 434                         uint16_t queue_idx,
 435                         uint16_t nb_desc,
 436                         unsigned int socket_id,
 437                         __rte_unused const struct rte_eth_rxconf *rx_conf,
 438                         struct rte_mempool *mp)
 439 {
 440         uint16_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_RQ_QUEUE_IDX;
 441         struct virtqueue *vq;
 442         int ret;
 443
 444         PMD_INIT_FUNC_TRACE();
 445         ret = virtio_dev_queue_setup(dev, VTNET_RQ, queue_idx, vtpci_queue_idx,
 446                         nb_desc, socket_id, &vq);
 447         if (ret < 0) {
 448                 PMD_INIT_LOG(ERR, "rvq initialization failed");
 449                 return ret;
 450         }
 451
 452         /* Create mempool for rx mbuf allocation */
 453         vq->mpool = mp;
 454
 455         dev->data->rx_queues[queue_idx] = vq;
 456
 457 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 458         virtio_rxq_vec_setup(vq);
 459 #endif
 460
 461         return 0;
 462 }
 463
 464 void
 465 virtio_dev_rx_queue_release(void *rxq)
 466 {
 467         virtio_dev_queue_release(rxq);
 468 }
 469
 470 /*
 471  * struct rte_eth_dev *dev: Used to update dev
 472  * uint16_t nb_desc: Defaults to values read from config space
 473  * unsigned int socket_id: Used to allocate memzone
 474  * const struct rte_eth_txconf *tx_conf: Used to setup tx engine
 475  * uint16_t queue_idx: Just used as an index in dev txq list
 476  */
 477 int
 478 virtio_dev_tx_queue_setup(struct rte_eth_dev *dev,
 479                         uint16_t queue_idx,
 480                         uint16_t nb_desc,
 481                         unsigned int socket_id,
 482                         const struct rte_eth_txconf *tx_conf)
 483 {
 484         uint8_t vtpci_queue_idx = 2 * queue_idx + VTNET_SQ_TQ_QUEUE_IDX;
 485
 486 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 487         struct virtio_hw *hw = dev->data->dev_private;
 488 #endif
 489         struct virtqueue *vq;
 490         uint16_t tx_free_thresh;
 491         int ret;
 492
 493         PMD_INIT_FUNC_TRACE();
 494
 495         if ((tx_conf->txq_flags & ETH_TXQ_FLAGS_NOXSUMS)
 496             != ETH_TXQ_FLAGS_NOXSUMS) {
 497                 PMD_INIT_LOG(ERR, "TX checksum offload not supported\n");
 498                 return -EINVAL;
 499         }
 500
 501 #ifdef RTE_MACHINE_CPUFLAG_SSSE3
 502         /* Use simple rx/tx func if single segment and no offloads */
 503         if ((tx_conf->txq_flags & VIRTIO_SIMPLE_FLAGS) == VIRTIO_SIMPLE_FLAGS &&
 504              !vtpci_with_feature(hw, VIRTIO_NET_F_MRG_RXBUF)) {
 505                 PMD_INIT_LOG(INFO, "Using simple rx/tx path");
 506                 dev->tx_pkt_burst = virtio_xmit_pkts_simple;
 507                 dev->rx_pkt_burst = virtio_recv_pkts_vec;
 508                 use_simple_rxtx = 1;
 509         }
 510 #endif
 511
 512         ret = virtio_dev_queue_setup(dev, VTNET_TQ, queue_idx, vtpci_queue_idx,
 513                         nb_desc, socket_id, &vq);
 514         if (ret < 0) {
 515                 PMD_INIT_LOG(ERR, "rvq initialization failed");
 516                 return ret;
 517         }
 518
 519         tx_free_thresh = tx_conf->tx_free_thresh;
 520         if (tx_free_thresh == 0)
 521                 tx_free_thresh =
 522                         RTE_MIN(vq->vq_nentries / 4, DEFAULT_TX_FREE_THRESH);
 523
 524         if (tx_free_thresh >= (vq->vq_nentries - 3)) {
 525                 RTE_LOG(ERR, PMD, "tx_free_thresh must be less than the "
 526                         "number of TX entries minus 3 (%u)."
 527                         " (tx_free_thresh=%u port=%u queue=%u)\n",
 528                         vq->vq_nentries - 3,
 529                         tx_free_thresh, dev->data->port_id, queue_idx);
 530                 return -EINVAL;
 531         }
 532
 533         vq->vq_free_thresh = tx_free_thresh;
 534
 535         dev->data->tx_queues[queue_idx] = vq;
 536         return 0;
 537 }
 538
 539 void
 540 virtio_dev_tx_queue_release(void *txq)
 541 {
 542         virtio_dev_queue_release(txq);
 543 }
 544
 545 static void
 546 virtio_discard_rxbuf(struct virtqueue *vq, struct rte_mbuf *m)
 547 {
 548         int error;
 549         /*
 550          * Requeue the discarded mbuf. This should always be
 551          * successful since it was just dequeued.
 552          */
 553         error = virtqueue_enqueue_recv_refill(vq, m);
 554         if (unlikely(error)) {
 555                 RTE_LOG(ERR, PMD, "cannot requeue discarded mbuf");
 556                 rte_pktmbuf_free(m);
 557         }
 558 }
 559
 560 static void
 561 virtio_update_packet_stats(struct virtqueue *vq, struct rte_mbuf *mbuf)
 562 {
 563         uint32_t s = mbuf->pkt_len;
 564         struct ether_addr *ea;
 565
 566         if (s == 64) {
 567                 vq->size_bins[1]++;
 568         } else if (s > 64 && s < 1024) {
 569                 uint32_t bin;
 570
 571                 /* count zeros, and offset into correct bin */
 572                 bin = (sizeof(s) * 8) - __builtin_clz(s) - 5;
 573                 vq->size_bins[bin]++;
 574         } else {
 575                 if (s < 64)
 576                         vq->size_bins[0]++;
 577                 else if (s < 1519)
 578                         vq->size_bins[6]++;
 579                 else if (s >= 1519)
 580                         vq->size_bins[7]++;
 581         }
 582
 583         ea = rte_pktmbuf_mtod(mbuf, struct ether_addr *);
 584         if (is_multicast_ether_addr(ea)) {
 585                 if (is_broadcast_ether_addr(ea))
 586                         vq->broadcast++;
 587                 else
 588                         vq->multicast++;
 589         }
 590 }
 591
 592 #define VIRTIO_MBUF_BURST_SZ 64
 593 #define DESC_PER_CACHELINE (RTE_CACHE_LINE_SIZE / sizeof(struct vring_desc))
 594 uint16_t
 595 virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 596 {
 597         struct virtqueue *rxvq = rx_queue;
 598         struct virtio_hw *hw;
 599         struct rte_mbuf *rxm, *new_mbuf;
 600         uint16_t nb_used, num, nb_rx;
 601         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 602         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 603         int error;
 604         uint32_t i, nb_enqueued;
 605         uint32_t hdr_size;
 606
 607         nb_used = VIRTQUEUE_NUSED(rxvq);
 608
 609         virtio_rmb();
 610
 611         num = (uint16_t)(likely(nb_used <= nb_pkts) ? nb_used : nb_pkts);
 612         num = (uint16_t)(likely(num <= VIRTIO_MBUF_BURST_SZ) ? num : VIRTIO_MBUF_BURST_SZ);
 613         if (likely(num > DESC_PER_CACHELINE))
 614                 num = num - ((rxvq->vq_used_cons_idx + num) % DESC_PER_CACHELINE);
 615
 616         num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, num);
 617         PMD_RX_LOG(DEBUG, "used:%d dequeue:%d", nb_used, num);
 618
 619         hw = rxvq->hw;
 620         nb_rx = 0;
 621         nb_enqueued = 0;
 622         hdr_size = hw->vtnet_hdr_size;
 623
 624         for (i = 0; i < num ; i++) {
 625                 rxm = rcv_pkts[i];
 626
 627                 PMD_RX_LOG(DEBUG, "packet len:%d", len[i]);
 628
 629                 if (unlikely(len[i] < hdr_size + ETHER_HDR_LEN)) {
 630                         PMD_RX_LOG(ERR, "Packet drop");
 631                         nb_enqueued++;
 632                         virtio_discard_rxbuf(rxvq, rxm);
 633                         rxvq->errors++;
 634                         continue;
 635                 }
 636
 637                 rxm->port = rxvq->port_id;
 638                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 639                 rxm->ol_flags = 0;
 640                 rxm->vlan_tci = 0;
 641
 642                 rxm->nb_segs = 1;
 643                 rxm->next = NULL;
 644                 rxm->pkt_len = (uint32_t)(len[i] - hdr_size);
 645                 rxm->data_len = (uint16_t)(len[i] - hdr_size);
 646
 647                 if (hw->vlan_strip)
 648                         rte_vlan_strip(rxm);
 649
 650                 VIRTIO_DUMP_PACKET(rxm, rxm->data_len);
 651
 652                 rx_pkts[nb_rx++] = rxm;
 653
 654                 rxvq->bytes += rx_pkts[nb_rx - 1]->pkt_len;
 655                 virtio_update_packet_stats(rxvq, rxm);
 656         }
 657
 658         rxvq->packets += nb_rx;
 659
 660         /* Allocate new mbuf for the used descriptor */
 661         error = ENOSPC;
 662         while (likely(!virtqueue_full(rxvq))) {
 663                 new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
 664                 if (unlikely(new_mbuf == NULL)) {
 665                         struct rte_eth_dev *dev
 666                                 = &rte_eth_devices[rxvq->port_id];
 667                         dev->data->rx_mbuf_alloc_failed++;
 668                         break;
 669                 }
 670                 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
 671                 if (unlikely(error)) {
 672                         rte_pktmbuf_free(new_mbuf);
 673                         break;
 674                 }
 675                 nb_enqueued++;
 676         }
 677
 678         if (likely(nb_enqueued)) {
 679                 vq_update_avail_idx(rxvq);
 680
 681                 if (unlikely(virtqueue_kick_prepare(rxvq))) {
 682                         virtqueue_notify(rxvq);
 683                         PMD_RX_LOG(DEBUG, "Notified\n");
 684                 }
 685         }
 686
 687         return nb_rx;
 688 }
 689
 690 uint16_t
 691 virtio_recv_mergeable_pkts(void *rx_queue,
 692                         struct rte_mbuf **rx_pkts,
 693                         uint16_t nb_pkts)
 694 {
 695         struct virtqueue *rxvq = rx_queue;
 696         struct virtio_hw *hw;
 697         struct rte_mbuf *rxm, *new_mbuf;
 698         uint16_t nb_used, num, nb_rx;
 699         uint32_t len[VIRTIO_MBUF_BURST_SZ];
 700         struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ];
 701         struct rte_mbuf *prev;
 702         int error;
 703         uint32_t i, nb_enqueued;
 704         uint32_t seg_num;
 705         uint16_t extra_idx;
 706         uint32_t seg_res;
 707         uint32_t hdr_size;
 708
 709         nb_used = VIRTQUEUE_NUSED(rxvq);
 710
 711         virtio_rmb();
 712
 713         PMD_RX_LOG(DEBUG, "used:%d\n", nb_used);
 714
 715         hw = rxvq->hw;
 716         nb_rx = 0;
 717         i = 0;
 718         nb_enqueued = 0;
 719         seg_num = 0;
 720         extra_idx = 0;
 721         seg_res = 0;
 722         hdr_size = hw->vtnet_hdr_size;
 723
 724         while (i < nb_used) {
 725                 struct virtio_net_hdr_mrg_rxbuf *header;
 726
 727                 if (nb_rx == nb_pkts)
 728                         break;
 729
 730                 num = virtqueue_dequeue_burst_rx(rxvq, rcv_pkts, len, 1);
 731                 if (num != 1)
 732                         continue;
 733
 734                 i++;
 735
 736                 PMD_RX_LOG(DEBUG, "dequeue:%d\n", num);
 737                 PMD_RX_LOG(DEBUG, "packet len:%d\n", len[0]);
 738
 739                 rxm = rcv_pkts[0];
 740
 741                 if (unlikely(len[0] < hdr_size + ETHER_HDR_LEN)) {
 742                         PMD_RX_LOG(ERR, "Packet drop\n");
 743                         nb_enqueued++;
 744                         virtio_discard_rxbuf(rxvq, rxm);
 745                         rxvq->errors++;
 746                         continue;
 747                 }
 748
 749                 header = (struct virtio_net_hdr_mrg_rxbuf *)((char *)rxm->buf_addr +
 750                         RTE_PKTMBUF_HEADROOM - hdr_size);
 751                 seg_num = header->num_buffers;
 752
 753                 if (seg_num == 0)
 754                         seg_num = 1;
 755
 756                 rxm->data_off = RTE_PKTMBUF_HEADROOM;
 757                 rxm->nb_segs = seg_num;
 758                 rxm->next = NULL;
 759                 rxm->ol_flags = 0;
 760                 rxm->vlan_tci = 0;
 761                 rxm->pkt_len = (uint32_t)(len[0] - hdr_size);
 762                 rxm->data_len = (uint16_t)(len[0] - hdr_size);
 763
 764                 rxm->port = rxvq->port_id;
 765                 rx_pkts[nb_rx] = rxm;
 766                 prev = rxm;
 767
 768                 seg_res = seg_num - 1;
 769
 770                 while (seg_res != 0) {
 771                         /*
 772                          * Get extra segments for current uncompleted packet.
 773                          */
 774                         uint16_t  rcv_cnt =
 775                                 RTE_MIN(seg_res, RTE_DIM(rcv_pkts));
 776                         if (likely(VIRTQUEUE_NUSED(rxvq) >= rcv_cnt)) {
 777                                 uint32_t rx_num =
 778                                         virtqueue_dequeue_burst_rx(rxvq,
 779                                         rcv_pkts, len, rcv_cnt);
 780                                 i += rx_num;
 781                                 rcv_cnt = rx_num;
 782                         } else {
 783                                 PMD_RX_LOG(ERR,
 784                                         "No enough segments for packet.\n");
 785                                 nb_enqueued++;
 786                                 virtio_discard_rxbuf(rxvq, rxm);
 787                                 rxvq->errors++;
 788                                 break;
 789                         }
 790
 791                         extra_idx = 0;
 792
 793                         while (extra_idx < rcv_cnt) {
 794                                 rxm = rcv_pkts[extra_idx];
 795
 796                                 rxm->data_off = RTE_PKTMBUF_HEADROOM - hdr_size;
 797                                 rxm->next = NULL;
 798                                 rxm->pkt_len = (uint32_t)(len[extra_idx]);
 799                                 rxm->data_len = (uint16_t)(len[extra_idx]);
 800
 801                                 if (prev)
 802                                         prev->next = rxm;
 803
 804                                 prev = rxm;
 805                                 rx_pkts[nb_rx]->pkt_len += rxm->pkt_len;
 806                                 extra_idx++;
 807                         };
 808                         seg_res -= rcv_cnt;
 809                 }
 810
 811                 if (hw->vlan_strip)
 812                         rte_vlan_strip(rx_pkts[nb_rx]);
 813
 814                 VIRTIO_DUMP_PACKET(rx_pkts[nb_rx],
 815                         rx_pkts[nb_rx]->data_len);
 816
 817                 rxvq->bytes += rx_pkts[nb_rx]->pkt_len;
 818                 virtio_update_packet_stats(rxvq, rx_pkts[nb_rx]);
 819                 nb_rx++;
 820         }
 821
 822         rxvq->packets += nb_rx;
 823
 824         /* Allocate new mbuf for the used descriptor */
 825         error = ENOSPC;
 826         while (likely(!virtqueue_full(rxvq))) {
 827                 new_mbuf = rte_rxmbuf_alloc(rxvq->mpool);
 828                 if (unlikely(new_mbuf == NULL)) {
 829                         struct rte_eth_dev *dev
 830                                 = &rte_eth_devices[rxvq->port_id];
 831                         dev->data->rx_mbuf_alloc_failed++;
 832                         break;
 833                 }
 834                 error = virtqueue_enqueue_recv_refill(rxvq, new_mbuf);
 835                 if (unlikely(error)) {
 836                         rte_pktmbuf_free(new_mbuf);
 837                         break;
 838                 }
 839                 nb_enqueued++;
 840         }
 841
 842         if (likely(nb_enqueued)) {
 843                 vq_update_avail_idx(rxvq);
 844
 845                 if (unlikely(virtqueue_kick_prepare(rxvq))) {
 846                         virtqueue_notify(rxvq);
 847                         PMD_RX_LOG(DEBUG, "Notified");
 848                 }
 849         }
 850
 851         return nb_rx;
 852 }
 853
 854 uint16_t
 855 virtio_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts)
 856 {
 857         struct virtqueue *txvq = tx_queue;
 858         struct virtio_hw *hw = txvq->hw;
 859         uint16_t hdr_size = hw->vtnet_hdr_size;
 860         uint16_t nb_used, nb_tx;
 861         int error;
 862
 863         if (unlikely(nb_pkts < 1))
 864                 return nb_pkts;
 865
 866         PMD_TX_LOG(DEBUG, "%d packets to xmit", nb_pkts);
 867         nb_used = VIRTQUEUE_NUSED(txvq);
 868
 869         virtio_rmb();
 870         if (likely(nb_used > txvq->vq_nentries - txvq->vq_free_thresh))
 871                 virtio_xmit_cleanup(txvq, nb_used);
 872
 873         for (nb_tx = 0; nb_tx < nb_pkts; nb_tx++) {
 874                 struct rte_mbuf *txm = tx_pkts[nb_tx];
 875                 int can_push = 0, use_indirect = 0, slots, need;
 876
 877                 /* Do VLAN tag insertion */
 878                 if (unlikely(txm->ol_flags & PKT_TX_VLAN_PKT)) {
 879                         error = rte_vlan_insert(&txm);
 880                         if (unlikely(error)) {
 881                                 rte_pktmbuf_free(txm);
 882                                 continue;
 883                         }
 884                 }
 885
 886                 /* optimize ring usage */
 887                 if (vtpci_with_feature(hw, VIRTIO_F_ANY_LAYOUT) &&
 888                     rte_mbuf_refcnt_read(txm) == 1 &&
 889                     txm->nb_segs == 1 &&
 890                     rte_pktmbuf_headroom(txm) >= hdr_size &&
 891                     rte_is_aligned(rte_pktmbuf_mtod(txm, char *),
 892                                    __alignof__(struct virtio_net_hdr_mrg_rxbuf)))
 893                         can_push = 1;
 894                 else if (vtpci_with_feature(hw, VIRTIO_RING_F_INDIRECT_DESC) &&
 895                          txm->nb_segs < VIRTIO_MAX_TX_INDIRECT)
 896                         use_indirect = 1;
 897
 898                 /* How many main ring entries are needed to this Tx?
 899                  * any_layout => number of segments
 900                  * indirect   => 1
 901                  * default    => number of segments + 1
 902                  */
 903                 slots = use_indirect ? 1 : (txm->nb_segs + !can_push);
 904                 need = slots - txvq->vq_free_cnt;
 905
 906                 /* Positive value indicates it need free vring descriptors */
 907                 if (unlikely(need > 0)) {
 908                         nb_used = VIRTQUEUE_NUSED(txvq);
 909                         virtio_rmb();
 910                         need = RTE_MIN(need, (int)nb_used);
 911
 912                         virtio_xmit_cleanup(txvq, need);
 913                         need = slots - txvq->vq_free_cnt;
 914                         if (unlikely(need > 0)) {
 915                                 PMD_TX_LOG(ERR,
 916                                            "No free tx descriptors to transmit");
 917                                 break;
 918                         }
 919                 }
 920
 921                 /* Enqueue Packet buffers */
 922                 virtqueue_enqueue_xmit(txvq, txm, slots, use_indirect, can_push);
 923
 924                 txvq->bytes += txm->pkt_len;
 925                 virtio_update_packet_stats(txvq, txm);
 926         }
 927
 928         txvq->packets += nb_tx;
 929
 930         if (likely(nb_tx)) {
 931                 vq_update_avail_idx(txvq);
 932
 933                 if (unlikely(virtqueue_kick_prepare(txvq))) {
 934                         virtqueue_notify(txvq);
 935                         PMD_TX_LOG(DEBUG, "Notified backend after xmit");
 936                 }
 937         }
 938
 939         return nb_tx;
 940 }