drivers/net/af_xdp/rte_eth_af_xdp.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2019 Intel Corporation.
   3  */
   4 #include <unistd.h>
   5 #include <errno.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <poll.h>
   9 #include <netinet/in.h>
  10 #include <net/if.h>
  11 #include <sys/socket.h>
  12 #include <sys/ioctl.h>
  13 #include <linux/if_ether.h>
  14 #include <linux/if_xdp.h>
  15 #include <linux/if_link.h>
  16 #include <linux/ethtool.h>
  17 #include <linux/sockios.h>
  18 #include "af_xdp_deps.h"
  19 #include <bpf/xsk.h>
  20
  21 #include <rte_ethdev.h>
  22 #include <rte_ethdev_driver.h>
  23 #include <rte_ethdev_vdev.h>
  24 #include <rte_kvargs.h>
  25 #include <rte_bus_vdev.h>
  26 #include <rte_string_fns.h>
  27 #include <rte_branch_prediction.h>
  28 #include <rte_common.h>
  29 #include <rte_config.h>
  30 #include <rte_dev.h>
  31 #include <rte_eal.h>
  32 #include <rte_ether.h>
  33 #include <rte_lcore.h>
  34 #include <rte_log.h>
  35 #include <rte_memory.h>
  36 #include <rte_memzone.h>
  37 #include <rte_mbuf.h>
  38 #include <rte_malloc.h>
  39 #include <rte_ring.h>
  40
  41 #ifndef SOL_XDP
  42 #define SOL_XDP 283
  43 #endif
  44
  45 #ifndef AF_XDP
  46 #define AF_XDP 44
  47 #endif
  48
  49 #ifndef PF_XDP
  50 #define PF_XDP AF_XDP
  51 #endif
  52
  53 static int af_xdp_logtype;
  54
  55 #define AF_XDP_LOG(level, fmt, args...)                 \
  56         rte_log(RTE_LOG_ ## level, af_xdp_logtype,      \
  57                 "%s(): " fmt, __func__, ##args)
  58
  59 #define ETH_AF_XDP_FRAME_SIZE           XSK_UMEM__DEFAULT_FRAME_SIZE
  60 #define ETH_AF_XDP_NUM_BUFFERS          4096
  61 #define ETH_AF_XDP_DATA_HEADROOM        0
  62 #define ETH_AF_XDP_DFLT_NUM_DESCS       XSK_RING_CONS__DEFAULT_NUM_DESCS
  63 #define ETH_AF_XDP_DFLT_START_QUEUE_IDX 0
  64 #define ETH_AF_XDP_DFLT_QUEUE_COUNT     1
  65
  66 #define ETH_AF_XDP_RX_BATCH_SIZE        32
  67 #define ETH_AF_XDP_TX_BATCH_SIZE        32
  68
  69
  70 struct xsk_umem_info {
  71         struct xsk_ring_prod fq;
  72         struct xsk_ring_cons cq;
  73         struct xsk_umem *umem;
  74         struct rte_ring *buf_ring;
  75         const struct rte_memzone *mz;
  76         int pmd_zc;
  77 };
  78
  79 struct rx_stats {
  80         uint64_t rx_pkts;
  81         uint64_t rx_bytes;
  82         uint64_t rx_dropped;
  83 };
  84
  85 struct pkt_rx_queue {
  86         struct xsk_ring_cons rx;
  87         struct xsk_umem_info *umem;
  88         struct xsk_socket *xsk;
  89         struct rte_mempool *mb_pool;
  90
  91         struct rx_stats stats;
  92
  93         struct pkt_tx_queue *pair;
  94         struct pollfd fds[1];
  95         int xsk_queue_idx;
  96 };
  97
  98 struct tx_stats {
  99         uint64_t tx_pkts;
 100         uint64_t err_pkts;
 101         uint64_t tx_bytes;
 102 };
 103
 104 struct pkt_tx_queue {
 105         struct xsk_ring_prod tx;
 106
 107         struct tx_stats stats;
 108
 109         struct pkt_rx_queue *pair;
 110         int xsk_queue_idx;
 111 };
 112
 113 struct pmd_internals {
 114         int if_index;
 115         char if_name[IFNAMSIZ];
 116         int start_queue_idx;
 117         int queue_cnt;
 118         int max_queue_cnt;
 119         int combined_queue_cnt;
 120
 121         int pmd_zc;
 122         struct rte_ether_addr eth_addr;
 123
 124         struct pkt_rx_queue *rx_queues;
 125         struct pkt_tx_queue *tx_queues;
 126 };
 127
 128 #define ETH_AF_XDP_IFACE_ARG                    "iface"
 129 #define ETH_AF_XDP_START_QUEUE_ARG              "start_queue"
 130 #define ETH_AF_XDP_QUEUE_COUNT_ARG              "queue_count"
 131 #define ETH_AF_XDP_PMD_ZC_ARG                   "pmd_zero_copy"
 132
 133 static const char * const valid_arguments[] = {
 134         ETH_AF_XDP_IFACE_ARG,
 135         ETH_AF_XDP_START_QUEUE_ARG,
 136         ETH_AF_XDP_QUEUE_COUNT_ARG,
 137         ETH_AF_XDP_PMD_ZC_ARG,
 138         NULL
 139 };
 140
 141 static const struct rte_eth_link pmd_link = {
 142         .link_speed = ETH_SPEED_NUM_10G,
 143         .link_duplex = ETH_LINK_FULL_DUPLEX,
 144         .link_status = ETH_LINK_DOWN,
 145         .link_autoneg = ETH_LINK_AUTONEG
 146 };
 147
 148 static inline int
 149 reserve_fill_queue(struct xsk_umem_info *umem, uint16_t reserve_size)
 150 {
 151         struct xsk_ring_prod *fq = &umem->fq;
 152         void *addrs[reserve_size];
 153         uint32_t idx;
 154         uint16_t i;
 155
 156         if (rte_ring_dequeue_bulk(umem->buf_ring, addrs, reserve_size, NULL)
 157                     != reserve_size) {
 158                 AF_XDP_LOG(DEBUG, "Failed to get enough buffers for fq.\n");
 159                 return -1;
 160         }
 161
 162         if (unlikely(!xsk_ring_prod__reserve(fq, reserve_size, &idx))) {
 163                 AF_XDP_LOG(DEBUG, "Failed to reserve enough fq descs.\n");
 164                 rte_ring_enqueue_bulk(umem->buf_ring, addrs,
 165                                 reserve_size, NULL);
 166                 return -1;
 167         }
 168
 169         for (i = 0; i < reserve_size; i++) {
 170                 __u64 *fq_addr;
 171
 172                 fq_addr = xsk_ring_prod__fill_addr(fq, idx++);
 173                 *fq_addr = (uint64_t)addrs[i];
 174         }
 175
 176         xsk_ring_prod__submit(fq, reserve_size);
 177
 178         return 0;
 179 }
 180
 181 static void
 182 umem_buf_release_to_fq(void *addr, void *opaque)
 183 {
 184         struct xsk_umem_info *umem = (struct xsk_umem_info *)opaque;
 185         uint64_t umem_addr = (uint64_t)addr - umem->mz->addr_64;
 186
 187         rte_ring_enqueue(umem->buf_ring, (void *)umem_addr);
 188 }
 189
 190 static uint16_t
 191 eth_af_xdp_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 192 {
 193         struct pkt_rx_queue *rxq = queue;
 194         struct xsk_ring_cons *rx = &rxq->rx;
 195         struct xsk_umem_info *umem = rxq->umem;
 196         struct xsk_ring_prod *fq = &umem->fq;
 197         uint32_t idx_rx = 0;
 198         uint32_t free_thresh = fq->size >> 1;
 199         int pmd_zc = umem->pmd_zc;
 200         struct rte_mbuf *mbufs[ETH_AF_XDP_RX_BATCH_SIZE];
 201         unsigned long dropped = 0;
 202         unsigned long rx_bytes = 0;
 203         int rcvd, i;
 204
 205         nb_pkts = RTE_MIN(nb_pkts, ETH_AF_XDP_RX_BATCH_SIZE);
 206
 207         if (unlikely(rte_pktmbuf_alloc_bulk(rxq->mb_pool, mbufs, nb_pkts) != 0))
 208                 return 0;
 209
 210         rcvd = xsk_ring_cons__peek(rx, nb_pkts, &idx_rx);
 211         if (rcvd == 0) {
 212 #if defined(XDP_USE_NEED_WAKEUP)
 213                 if (xsk_ring_prod__needs_wakeup(fq))
 214                         (void)poll(rxq->fds, 1, 1000);
 215 #endif
 216
 217                 goto out;
 218         }
 219
 220         if (xsk_prod_nb_free(fq, free_thresh) >= free_thresh)
 221                 (void)reserve_fill_queue(umem, ETH_AF_XDP_RX_BATCH_SIZE);
 222
 223         for (i = 0; i < rcvd; i++) {
 224                 const struct xdp_desc *desc;
 225                 uint64_t addr;
 226                 uint32_t len;
 227                 void *pkt;
 228                 uint16_t buf_len = ETH_AF_XDP_FRAME_SIZE;
 229                 struct rte_mbuf_ext_shared_info *shinfo;
 230
 231                 desc = xsk_ring_cons__rx_desc(rx, idx_rx++);
 232                 addr = desc->addr;
 233                 len = desc->len;
 234                 pkt = xsk_umem__get_data(rxq->umem->mz->addr, addr);
 235
 236                 if (pmd_zc) {
 237                         shinfo = rte_pktmbuf_ext_shinfo_init_helper(pkt,
 238                                         &buf_len, umem_buf_release_to_fq, umem);
 239
 240                         rte_pktmbuf_attach_extbuf(mbufs[i], pkt, 0, buf_len,
 241                                                   shinfo);
 242                 } else {
 243                         rte_memcpy(rte_pktmbuf_mtod(mbufs[i], void *),
 244                                                         pkt, len);
 245                         rte_ring_enqueue(umem->buf_ring, (void *)addr);
 246                 }
 247                 rte_pktmbuf_pkt_len(mbufs[i]) = len;
 248                 rte_pktmbuf_data_len(mbufs[i]) = len;
 249                 rx_bytes += len;
 250                 bufs[i] = mbufs[i];
 251         }
 252
 253         xsk_ring_cons__release(rx, rcvd);
 254
 255         /* statistics */
 256         rxq->stats.rx_pkts += (rcvd - dropped);
 257         rxq->stats.rx_bytes += rx_bytes;
 258
 259 out:
 260         if (rcvd != nb_pkts)
 261                 rte_mempool_put_bulk(rxq->mb_pool, (void **)&mbufs[rcvd],
 262                                      nb_pkts - rcvd);
 263
 264         return rcvd;
 265 }
 266
 267 static void
 268 pull_umem_cq(struct xsk_umem_info *umem, int size)
 269 {
 270         struct xsk_ring_cons *cq = &umem->cq;
 271         size_t i, n;
 272         uint32_t idx_cq = 0;
 273
 274         n = xsk_ring_cons__peek(cq, size, &idx_cq);
 275
 276         for (i = 0; i < n; i++) {
 277                 uint64_t addr;
 278                 addr = *xsk_ring_cons__comp_addr(cq, idx_cq++);
 279                 rte_ring_enqueue(umem->buf_ring, (void *)addr);
 280         }
 281
 282         xsk_ring_cons__release(cq, n);
 283 }
 284
 285 static void
 286 kick_tx(struct pkt_tx_queue *txq)
 287 {
 288         struct xsk_umem_info *umem = txq->pair->umem;
 289
 290 #if defined(XDP_USE_NEED_WAKEUP)
 291         if (xsk_ring_prod__needs_wakeup(&txq->tx))
 292 #endif
 293                 while (send(xsk_socket__fd(txq->pair->xsk), NULL,
 294                             0, MSG_DONTWAIT) < 0) {
 295                         /* some thing unexpected */
 296                         if (errno != EBUSY && errno != EAGAIN && errno != EINTR)
 297                                 break;
 298
 299                         /* pull from completion queue to leave more space */
 300                         if (errno == EAGAIN)
 301                                 pull_umem_cq(umem, ETH_AF_XDP_TX_BATCH_SIZE);
 302                 }
 303         pull_umem_cq(umem, ETH_AF_XDP_TX_BATCH_SIZE);
 304 }
 305
 306 static inline bool
 307 in_umem_range(struct xsk_umem_info *umem, uint64_t addr)
 308 {
 309         uint64_t mz_base_addr = umem->mz->addr_64;
 310
 311         return addr >= mz_base_addr && addr < mz_base_addr + umem->mz->len;
 312 }
 313
 314 static uint16_t
 315 eth_af_xdp_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 316 {
 317         struct pkt_tx_queue *txq = queue;
 318         struct xsk_umem_info *umem = txq->pair->umem;
 319         struct rte_mbuf *mbuf;
 320         int pmd_zc = umem->pmd_zc;
 321         void *addrs[ETH_AF_XDP_TX_BATCH_SIZE];
 322         unsigned long tx_bytes = 0;
 323         int i;
 324         uint32_t idx_tx;
 325
 326         nb_pkts = RTE_MIN(nb_pkts, ETH_AF_XDP_TX_BATCH_SIZE);
 327
 328         pull_umem_cq(umem, nb_pkts);
 329
 330         nb_pkts = rte_ring_dequeue_bulk(umem->buf_ring, addrs,
 331                                         nb_pkts, NULL);
 332         if (nb_pkts == 0)
 333                 return 0;
 334
 335         if (xsk_ring_prod__reserve(&txq->tx, nb_pkts, &idx_tx) != nb_pkts) {
 336                 kick_tx(txq);
 337                 rte_ring_enqueue_bulk(umem->buf_ring, addrs, nb_pkts, NULL);
 338                 return 0;
 339         }
 340
 341         for (i = 0; i < nb_pkts; i++) {
 342                 struct xdp_desc *desc;
 343                 void *pkt;
 344
 345                 desc = xsk_ring_prod__tx_desc(&txq->tx, idx_tx + i);
 346                 mbuf = bufs[i];
 347                 desc->len = mbuf->pkt_len;
 348
 349                 /*
 350                  * We need to make sure the external mbuf address is within
 351                  * current port's umem memzone range
 352                  */
 353                 if (pmd_zc && RTE_MBUF_HAS_EXTBUF(mbuf) &&
 354                                 in_umem_range(umem, (uint64_t)mbuf->buf_addr)) {
 355                         desc->addr = (uint64_t)mbuf->buf_addr -
 356                                 umem->mz->addr_64;
 357                         mbuf->buf_addr = xsk_umem__get_data(umem->mz->addr,
 358                                         (uint64_t)addrs[i]);
 359                 } else {
 360                         desc->addr = (uint64_t)addrs[i];
 361                         pkt = xsk_umem__get_data(umem->mz->addr,
 362                                         desc->addr);
 363                         rte_memcpy(pkt, rte_pktmbuf_mtod(mbuf, void *),
 364                                         desc->len);
 365                 }
 366                 tx_bytes += mbuf->pkt_len;
 367         }
 368
 369         xsk_ring_prod__submit(&txq->tx, nb_pkts);
 370
 371         kick_tx(txq);
 372
 373         txq->stats.tx_pkts += nb_pkts;
 374         txq->stats.tx_bytes += tx_bytes;
 375
 376         for (i = 0; i < nb_pkts; i++)
 377                 rte_pktmbuf_free(bufs[i]);
 378
 379         return nb_pkts;
 380 }
 381
 382 static int
 383 eth_dev_start(struct rte_eth_dev *dev)
 384 {
 385         dev->data->dev_link.link_status = ETH_LINK_UP;
 386
 387         return 0;
 388 }
 389
 390 /* This function gets called when the current port gets stopped. */
 391 static void
 392 eth_dev_stop(struct rte_eth_dev *dev)
 393 {
 394         dev->data->dev_link.link_status = ETH_LINK_DOWN;
 395 }
 396
 397 static int
 398 eth_dev_configure(struct rte_eth_dev *dev)
 399 {
 400         /* rx/tx must be paired */
 401         if (dev->data->nb_rx_queues != dev->data->nb_tx_queues)
 402                 return -EINVAL;
 403
 404         return 0;
 405 }
 406
 407 static void
 408 eth_dev_info(struct rte_eth_dev *dev, struct rte_eth_dev_info *dev_info)
 409 {
 410         struct pmd_internals *internals = dev->data->dev_private;
 411
 412         dev_info->if_index = internals->if_index;
 413         dev_info->max_mac_addrs = 1;
 414         dev_info->max_rx_pktlen = ETH_FRAME_LEN;
 415         dev_info->max_rx_queues = internals->queue_cnt;
 416         dev_info->max_tx_queues = internals->queue_cnt;
 417
 418         dev_info->min_mtu = RTE_ETHER_MIN_MTU;
 419         dev_info->max_mtu = ETH_AF_XDP_FRAME_SIZE - ETH_AF_XDP_DATA_HEADROOM;
 420
 421         dev_info->default_rxportconf.nb_queues = 1;
 422         dev_info->default_txportconf.nb_queues = 1;
 423         dev_info->default_rxportconf.ring_size = ETH_AF_XDP_DFLT_NUM_DESCS;
 424         dev_info->default_txportconf.ring_size = ETH_AF_XDP_DFLT_NUM_DESCS;
 425 }
 426
 427 static int
 428 eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 429 {
 430         struct pmd_internals *internals = dev->data->dev_private;
 431         struct xdp_statistics xdp_stats;
 432         struct pkt_rx_queue *rxq;
 433         struct pkt_tx_queue *txq;
 434         socklen_t optlen;
 435         int i, ret;
 436
 437         for (i = 0; i < dev->data->nb_rx_queues; i++) {
 438                 optlen = sizeof(struct xdp_statistics);
 439                 rxq = &internals->rx_queues[i];
 440                 txq = rxq->pair;
 441                 stats->q_ipackets[i] = rxq->stats.rx_pkts;
 442                 stats->q_ibytes[i] = rxq->stats.rx_bytes;
 443
 444                 stats->q_opackets[i] = txq->stats.tx_pkts;
 445                 stats->q_obytes[i] = txq->stats.tx_bytes;
 446
 447                 stats->ipackets += stats->q_ipackets[i];
 448                 stats->ibytes += stats->q_ibytes[i];
 449                 stats->imissed += rxq->stats.rx_dropped;
 450                 ret = getsockopt(xsk_socket__fd(rxq->xsk), SOL_XDP,
 451                                 XDP_STATISTICS, &xdp_stats, &optlen);
 452                 if (ret != 0) {
 453                         AF_XDP_LOG(ERR, "getsockopt() failed for XDP_STATISTICS.\n");
 454                         return -1;
 455                 }
 456                 stats->imissed += xdp_stats.rx_dropped;
 457
 458                 stats->opackets += stats->q_opackets[i];
 459                 stats->oerrors += txq->stats.err_pkts;
 460                 stats->obytes += stats->q_obytes[i];
 461         }
 462
 463         return 0;
 464 }
 465
 466 static void
 467 eth_stats_reset(struct rte_eth_dev *dev)
 468 {
 469         struct pmd_internals *internals = dev->data->dev_private;
 470         int i;
 471
 472         for (i = 0; i < internals->queue_cnt; i++) {
 473                 memset(&internals->rx_queues[i].stats, 0,
 474                                         sizeof(struct rx_stats));
 475                 memset(&internals->tx_queues[i].stats, 0,
 476                                         sizeof(struct tx_stats));
 477         }
 478 }
 479
 480 static void
 481 remove_xdp_program(struct pmd_internals *internals)
 482 {
 483         uint32_t curr_prog_id = 0;
 484
 485         if (bpf_get_link_xdp_id(internals->if_index, &curr_prog_id,
 486                                 XDP_FLAGS_UPDATE_IF_NOEXIST)) {
 487                 AF_XDP_LOG(ERR, "bpf_get_link_xdp_id failed\n");
 488                 return;
 489         }
 490         bpf_set_link_xdp_fd(internals->if_index, -1,
 491                         XDP_FLAGS_UPDATE_IF_NOEXIST);
 492 }
 493
 494 static void
 495 xdp_umem_destroy(struct xsk_umem_info *umem)
 496 {
 497         rte_memzone_free(umem->mz);
 498         umem->mz = NULL;
 499
 500         rte_ring_free(umem->buf_ring);
 501         umem->buf_ring = NULL;
 502
 503         rte_free(umem);
 504         umem = NULL;
 505 }
 506
 507 static void
 508 eth_dev_close(struct rte_eth_dev *dev)
 509 {
 510         struct pmd_internals *internals = dev->data->dev_private;
 511         struct pkt_rx_queue *rxq;
 512         int i;
 513
 514         AF_XDP_LOG(INFO, "Closing AF_XDP ethdev on numa socket %u\n",
 515                 rte_socket_id());
 516
 517         for (i = 0; i < internals->queue_cnt; i++) {
 518                 rxq = &internals->rx_queues[i];
 519                 if (rxq->umem == NULL)
 520                         break;
 521                 xsk_socket__delete(rxq->xsk);
 522                 (void)xsk_umem__delete(rxq->umem->umem);
 523                 xdp_umem_destroy(rxq->umem);
 524
 525                 /* free pkt_tx_queue */
 526                 rte_free(rxq->pair);
 527                 rte_free(rxq);
 528         }
 529
 530         /*
 531          * MAC is not allocated dynamically, setting it to NULL would prevent
 532          * from releasing it in rte_eth_dev_release_port.
 533          */
 534         dev->data->mac_addrs = NULL;
 535
 536         remove_xdp_program(internals);
 537 }
 538
 539 static void
 540 eth_queue_release(void *q __rte_unused)
 541 {
 542 }
 543
 544 static int
 545 eth_link_update(struct rte_eth_dev *dev __rte_unused,
 546                 int wait_to_complete __rte_unused)
 547 {
 548         return 0;
 549 }
 550
 551 static struct
 552 xsk_umem_info *xdp_umem_configure(struct pmd_internals *internals,
 553                                   struct pkt_rx_queue *rxq)
 554 {
 555         struct xsk_umem_info *umem;
 556         const struct rte_memzone *mz;
 557         struct xsk_umem_config usr_config = {
 558                 .fill_size = ETH_AF_XDP_DFLT_NUM_DESCS,
 559                 .comp_size = ETH_AF_XDP_DFLT_NUM_DESCS,
 560                 .frame_size = ETH_AF_XDP_FRAME_SIZE,
 561                 .frame_headroom = ETH_AF_XDP_DATA_HEADROOM };
 562         char ring_name[RTE_RING_NAMESIZE];
 563         char mz_name[RTE_MEMZONE_NAMESIZE];
 564         int ret;
 565         uint64_t i;
 566
 567         umem = rte_zmalloc_socket("umem", sizeof(*umem), 0, rte_socket_id());
 568         if (umem == NULL) {
 569                 AF_XDP_LOG(ERR, "Failed to allocate umem info");
 570                 return NULL;
 571         }
 572
 573         snprintf(ring_name, sizeof(ring_name), "af_xdp_ring_%s_%u",
 574                        internals->if_name, rxq->xsk_queue_idx);
 575         umem->buf_ring = rte_ring_create(ring_name,
 576                                          ETH_AF_XDP_NUM_BUFFERS,
 577                                          rte_socket_id(),
 578                                          0x0);
 579         if (umem->buf_ring == NULL) {
 580                 AF_XDP_LOG(ERR, "Failed to create rte_ring\n");
 581                 goto err;
 582         }
 583
 584         for (i = 0; i < ETH_AF_XDP_NUM_BUFFERS; i++)
 585                 rte_ring_enqueue(umem->buf_ring,
 586                                  (void *)(i * ETH_AF_XDP_FRAME_SIZE +
 587                                           ETH_AF_XDP_DATA_HEADROOM));
 588
 589         snprintf(mz_name, sizeof(mz_name), "af_xdp_umem_%s_%u",
 590                        internals->if_name, rxq->xsk_queue_idx);
 591         mz = rte_memzone_reserve_aligned(mz_name,
 592                         ETH_AF_XDP_NUM_BUFFERS * ETH_AF_XDP_FRAME_SIZE,
 593                         rte_socket_id(), RTE_MEMZONE_IOVA_CONTIG,
 594                         getpagesize());
 595         if (mz == NULL) {
 596                 AF_XDP_LOG(ERR, "Failed to reserve memzone for af_xdp umem.\n");
 597                 goto err;
 598         }
 599
 600         ret = xsk_umem__create(&umem->umem, mz->addr,
 601                                ETH_AF_XDP_NUM_BUFFERS * ETH_AF_XDP_FRAME_SIZE,
 602                                &umem->fq, &umem->cq,
 603                                &usr_config);
 604
 605         if (ret) {
 606                 AF_XDP_LOG(ERR, "Failed to create umem");
 607                 goto err;
 608         }
 609         umem->mz = mz;
 610
 611         return umem;
 612
 613 err:
 614         xdp_umem_destroy(umem);
 615         return NULL;
 616 }
 617
 618 static int
 619 xsk_configure(struct pmd_internals *internals, struct pkt_rx_queue *rxq,
 620               int ring_size)
 621 {
 622         struct xsk_socket_config cfg;
 623         struct pkt_tx_queue *txq = rxq->pair;
 624         int ret = 0;
 625         int reserve_size;
 626
 627         rxq->umem = xdp_umem_configure(internals, rxq);
 628         if (rxq->umem == NULL)
 629                 return -ENOMEM;
 630
 631         cfg.rx_size = ring_size;
 632         cfg.tx_size = ring_size;
 633         cfg.libbpf_flags = 0;
 634         cfg.xdp_flags = XDP_FLAGS_UPDATE_IF_NOEXIST;
 635         cfg.bind_flags = 0;
 636
 637 #if defined(XDP_USE_NEED_WAKEUP)
 638         cfg.bind_flags |= XDP_USE_NEED_WAKEUP;
 639 #endif
 640
 641         ret = xsk_socket__create(&rxq->xsk, internals->if_name,
 642                         rxq->xsk_queue_idx, rxq->umem->umem, &rxq->rx,
 643                         &txq->tx, &cfg);
 644         if (ret) {
 645                 AF_XDP_LOG(ERR, "Failed to create xsk socket.\n");
 646                 goto err;
 647         }
 648
 649         reserve_size = ETH_AF_XDP_DFLT_NUM_DESCS / 2;
 650         ret = reserve_fill_queue(rxq->umem, reserve_size);
 651         if (ret) {
 652                 xsk_socket__delete(rxq->xsk);
 653                 AF_XDP_LOG(ERR, "Failed to reserve fill queue.\n");
 654                 goto err;
 655         }
 656
 657         return 0;
 658
 659 err:
 660         xdp_umem_destroy(rxq->umem);
 661
 662         return ret;
 663 }
 664
 665 static int
 666 eth_rx_queue_setup(struct rte_eth_dev *dev,
 667                    uint16_t rx_queue_id,
 668                    uint16_t nb_rx_desc,
 669                    unsigned int socket_id __rte_unused,
 670                    const struct rte_eth_rxconf *rx_conf __rte_unused,
 671                    struct rte_mempool *mb_pool)
 672 {
 673         struct pmd_internals *internals = dev->data->dev_private;
 674         uint32_t buf_size, data_size;
 675         struct pkt_rx_queue *rxq;
 676         int ret;
 677
 678         rxq = &internals->rx_queues[rx_queue_id];
 679
 680         AF_XDP_LOG(INFO, "Set up rx queue, rx queue id: %d, xsk queue id: %d\n",
 681                    rx_queue_id, rxq->xsk_queue_idx);
 682         /* Now get the space available for data in the mbuf */
 683         buf_size = rte_pktmbuf_data_room_size(mb_pool) -
 684                 RTE_PKTMBUF_HEADROOM;
 685         data_size = ETH_AF_XDP_FRAME_SIZE - ETH_AF_XDP_DATA_HEADROOM;
 686
 687         if (data_size > buf_size) {
 688                 AF_XDP_LOG(ERR, "%s: %d bytes will not fit in mbuf (%d bytes)\n",
 689                         dev->device->name, data_size, buf_size);
 690                 ret = -ENOMEM;
 691                 goto err;
 692         }
 693
 694         rxq->mb_pool = mb_pool;
 695
 696         if (xsk_configure(internals, rxq, nb_rx_desc)) {
 697                 AF_XDP_LOG(ERR, "Failed to configure xdp socket\n");
 698                 ret = -EINVAL;
 699                 goto err;
 700         }
 701
 702         rxq->fds[0].fd = xsk_socket__fd(rxq->xsk);
 703         rxq->fds[0].events = POLLIN;
 704
 705         rxq->umem->pmd_zc = internals->pmd_zc;
 706
 707         dev->data->rx_queues[rx_queue_id] = rxq;
 708         return 0;
 709
 710 err:
 711         return ret;
 712 }
 713
 714 static int
 715 eth_tx_queue_setup(struct rte_eth_dev *dev,
 716                    uint16_t tx_queue_id,
 717                    uint16_t nb_tx_desc __rte_unused,
 718                    unsigned int socket_id __rte_unused,
 719                    const struct rte_eth_txconf *tx_conf __rte_unused)
 720 {
 721         struct pmd_internals *internals = dev->data->dev_private;
 722         struct pkt_tx_queue *txq;
 723
 724         txq = &internals->tx_queues[tx_queue_id];
 725
 726         dev->data->tx_queues[tx_queue_id] = txq;
 727         return 0;
 728 }
 729
 730 static int
 731 eth_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 732 {
 733         struct pmd_internals *internals = dev->data->dev_private;
 734         struct ifreq ifr = { .ifr_mtu = mtu };
 735         int ret;
 736         int s;
 737
 738         s = socket(PF_INET, SOCK_DGRAM, 0);
 739         if (s < 0)
 740                 return -EINVAL;
 741
 742         strlcpy(ifr.ifr_name, internals->if_name, IFNAMSIZ);
 743         ret = ioctl(s, SIOCSIFMTU, &ifr);
 744         close(s);
 745
 746         return (ret < 0) ? -errno : 0;
 747 }
 748
 749 static void
 750 eth_dev_change_flags(char *if_name, uint32_t flags, uint32_t mask)
 751 {
 752         struct ifreq ifr;
 753         int s;
 754
 755         s = socket(PF_INET, SOCK_DGRAM, 0);
 756         if (s < 0)
 757                 return;
 758
 759         strlcpy(ifr.ifr_name, if_name, IFNAMSIZ);
 760         if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0)
 761                 goto out;
 762         ifr.ifr_flags &= mask;
 763         ifr.ifr_flags |= flags;
 764         if (ioctl(s, SIOCSIFFLAGS, &ifr) < 0)
 765                 goto out;
 766 out:
 767         close(s);
 768 }
 769
 770 static void
 771 eth_dev_promiscuous_enable(struct rte_eth_dev *dev)
 772 {
 773         struct pmd_internals *internals = dev->data->dev_private;
 774
 775         eth_dev_change_flags(internals->if_name, IFF_PROMISC, ~0);
 776 }
 777
 778 static void
 779 eth_dev_promiscuous_disable(struct rte_eth_dev *dev)
 780 {
 781         struct pmd_internals *internals = dev->data->dev_private;
 782
 783         eth_dev_change_flags(internals->if_name, 0, ~IFF_PROMISC);
 784 }
 785
 786 static const struct eth_dev_ops ops = {
 787         .dev_start = eth_dev_start,
 788         .dev_stop = eth_dev_stop,
 789         .dev_close = eth_dev_close,
 790         .dev_configure = eth_dev_configure,
 791         .dev_infos_get = eth_dev_info,
 792         .mtu_set = eth_dev_mtu_set,
 793         .promiscuous_enable = eth_dev_promiscuous_enable,
 794         .promiscuous_disable = eth_dev_promiscuous_disable,
 795         .rx_queue_setup = eth_rx_queue_setup,
 796         .tx_queue_setup = eth_tx_queue_setup,
 797         .rx_queue_release = eth_queue_release,
 798         .tx_queue_release = eth_queue_release,
 799         .link_update = eth_link_update,
 800         .stats_get = eth_stats_get,
 801         .stats_reset = eth_stats_reset,
 802 };
 803
 804 /** parse integer from integer argument */
 805 static int
 806 parse_integer_arg(const char *key __rte_unused,
 807                   const char *value, void *extra_args)
 808 {
 809         int *i = (int *)extra_args;
 810         char *end;
 811
 812         *i = strtol(value, &end, 10);
 813         if (*i < 0) {
 814                 AF_XDP_LOG(ERR, "Argument has to be positive.\n");
 815                 return -EINVAL;
 816         }
 817
 818         return 0;
 819 }
 820
 821 /** parse name argument */
 822 static int
 823 parse_name_arg(const char *key __rte_unused,
 824                const char *value, void *extra_args)
 825 {
 826         char *name = extra_args;
 827
 828         if (strnlen(value, IFNAMSIZ) > IFNAMSIZ - 1) {
 829                 AF_XDP_LOG(ERR, "Invalid name %s, should be less than %u bytes.\n",
 830                            value, IFNAMSIZ);
 831                 return -EINVAL;
 832         }
 833
 834         strlcpy(name, value, IFNAMSIZ);
 835
 836         return 0;
 837 }
 838
 839 static int
 840 xdp_get_channels_info(const char *if_name, int *max_queues,
 841                                 int *combined_queues)
 842 {
 843         struct ethtool_channels channels;
 844         struct ifreq ifr;
 845         int fd, ret;
 846
 847         fd = socket(AF_INET, SOCK_DGRAM, 0);
 848         if (fd < 0)
 849                 return -1;
 850
 851         channels.cmd = ETHTOOL_GCHANNELS;
 852         ifr.ifr_data = (void *)&channels;
 853         strncpy(ifr.ifr_name, if_name, IFNAMSIZ);
 854         ret = ioctl(fd, SIOCETHTOOL, &ifr);
 855         if (ret && errno != EOPNOTSUPP) {
 856                 ret = -errno;
 857                 goto out;
 858         }
 859
 860         if (channels.max_combined == 0 || errno == EOPNOTSUPP) {
 861                 /* If the device says it has no channels, then all traffic
 862                  * is sent to a single stream, so max queues = 1.
 863                  */
 864                 *max_queues = 1;
 865                 *combined_queues = 1;
 866         } else {
 867                 *max_queues = channels.max_combined;
 868                 *combined_queues = channels.combined_count;
 869         }
 870
 871  out:
 872         close(fd);
 873         return ret;
 874 }
 875
 876 static int
 877 parse_parameters(struct rte_kvargs *kvlist, char *if_name, int *start_queue,
 878                         int *queue_cnt, int *pmd_zc)
 879 {
 880         int ret;
 881
 882         ret = rte_kvargs_process(kvlist, ETH_AF_XDP_IFACE_ARG,
 883                                  &parse_name_arg, if_name);
 884         if (ret < 0)
 885                 goto free_kvlist;
 886
 887         ret = rte_kvargs_process(kvlist, ETH_AF_XDP_START_QUEUE_ARG,
 888                                  &parse_integer_arg, start_queue);
 889         if (ret < 0)
 890                 goto free_kvlist;
 891
 892         ret = rte_kvargs_process(kvlist, ETH_AF_XDP_QUEUE_COUNT_ARG,
 893                                  &parse_integer_arg, queue_cnt);
 894         if (ret < 0 || *queue_cnt <= 0) {
 895                 ret = -EINVAL;
 896                 goto free_kvlist;
 897         }
 898
 899         ret = rte_kvargs_process(kvlist, ETH_AF_XDP_PMD_ZC_ARG,
 900                                  &parse_integer_arg, pmd_zc);
 901         if (ret < 0)
 902                 goto free_kvlist;
 903
 904 free_kvlist:
 905         rte_kvargs_free(kvlist);
 906         return ret;
 907 }
 908
 909 static int
 910 get_iface_info(const char *if_name,
 911                struct rte_ether_addr *eth_addr,
 912                int *if_index)
 913 {
 914         struct ifreq ifr;
 915         int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
 916
 917         if (sock < 0)
 918                 return -1;
 919
 920         strlcpy(ifr.ifr_name, if_name, IFNAMSIZ);
 921         if (ioctl(sock, SIOCGIFINDEX, &ifr))
 922                 goto error;
 923
 924         *if_index = ifr.ifr_ifindex;
 925
 926         if (ioctl(sock, SIOCGIFHWADDR, &ifr))
 927                 goto error;
 928
 929         rte_memcpy(eth_addr, ifr.ifr_hwaddr.sa_data, RTE_ETHER_ADDR_LEN);
 930
 931         close(sock);
 932         return 0;
 933
 934 error:
 935         close(sock);
 936         return -1;
 937 }
 938
 939 static struct rte_eth_dev *
 940 init_internals(struct rte_vdev_device *dev, const char *if_name,
 941                         int start_queue_idx, int queue_cnt, int pmd_zc)
 942 {
 943         const char *name = rte_vdev_device_name(dev);
 944         const unsigned int numa_node = dev->device.numa_node;
 945         struct pmd_internals *internals;
 946         struct rte_eth_dev *eth_dev;
 947         int ret;
 948         int i;
 949
 950         internals = rte_zmalloc_socket(name, sizeof(*internals), 0, numa_node);
 951         if (internals == NULL)
 952                 return NULL;
 953
 954         internals->start_queue_idx = start_queue_idx;
 955         internals->queue_cnt = queue_cnt;
 956         internals->pmd_zc = pmd_zc;
 957         strlcpy(internals->if_name, if_name, IFNAMSIZ);
 958
 959         if (xdp_get_channels_info(if_name, &internals->max_queue_cnt,
 960                                   &internals->combined_queue_cnt)) {
 961                 AF_XDP_LOG(ERR, "Failed to get channel info of interface: %s\n",
 962                                 if_name);
 963                 goto err_free_internals;
 964         }
 965
 966         if (queue_cnt > internals->combined_queue_cnt) {
 967                 AF_XDP_LOG(ERR, "Specified queue count %d is larger than combined queue count %d.\n",
 968                                 queue_cnt, internals->combined_queue_cnt);
 969                 goto err_free_internals;
 970         }
 971
 972         internals->rx_queues = rte_zmalloc_socket(NULL,
 973                                         sizeof(struct pkt_rx_queue) * queue_cnt,
 974                                         0, numa_node);
 975         if (internals->rx_queues == NULL) {
 976                 AF_XDP_LOG(ERR, "Failed to allocate memory for rx queues.\n");
 977                 goto err_free_internals;
 978         }
 979
 980         internals->tx_queues = rte_zmalloc_socket(NULL,
 981                                         sizeof(struct pkt_tx_queue) * queue_cnt,
 982                                         0, numa_node);
 983         if (internals->tx_queues == NULL) {
 984                 AF_XDP_LOG(ERR, "Failed to allocate memory for tx queues.\n");
 985                 goto err_free_rx;
 986         }
 987         for (i = 0; i < queue_cnt; i++) {
 988                 internals->tx_queues[i].pair = &internals->rx_queues[i];
 989                 internals->rx_queues[i].pair = &internals->tx_queues[i];
 990                 internals->rx_queues[i].xsk_queue_idx = start_queue_idx + i;
 991                 internals->tx_queues[i].xsk_queue_idx = start_queue_idx + i;
 992         }
 993
 994         ret = get_iface_info(if_name, &internals->eth_addr,
 995                              &internals->if_index);
 996         if (ret)
 997                 goto err_free_tx;
 998
 999         eth_dev = rte_eth_vdev_allocate(dev, 0);
1000         if (eth_dev == NULL)
1001                 goto err_free_tx;
1002
1003         eth_dev->data->dev_private = internals;
1004         eth_dev->data->dev_link = pmd_link;
1005         eth_dev->data->mac_addrs = &internals->eth_addr;
1006         eth_dev->dev_ops = &ops;
1007         eth_dev->rx_pkt_burst = eth_af_xdp_rx;
1008         eth_dev->tx_pkt_burst = eth_af_xdp_tx;
1009         /* Let rte_eth_dev_close() release the port resources. */
1010         eth_dev->data->dev_flags |= RTE_ETH_DEV_CLOSE_REMOVE;
1011
1012         if (internals->pmd_zc)
1013                 AF_XDP_LOG(INFO, "Zero copy between umem and mbuf enabled.\n");
1014
1015         return eth_dev;
1016
1017 err_free_tx:
1018         rte_free(internals->tx_queues);
1019 err_free_rx:
1020         rte_free(internals->rx_queues);
1021 err_free_internals:
1022         rte_free(internals);
1023         return NULL;
1024 }
1025
1026 static int
1027 rte_pmd_af_xdp_probe(struct rte_vdev_device *dev)
1028 {
1029         struct rte_kvargs *kvlist;
1030         char if_name[IFNAMSIZ] = {'\0'};
1031         int xsk_start_queue_idx = ETH_AF_XDP_DFLT_START_QUEUE_IDX;
1032         int xsk_queue_cnt = ETH_AF_XDP_DFLT_QUEUE_COUNT;
1033         struct rte_eth_dev *eth_dev = NULL;
1034         const char *name;
1035         int pmd_zc = 0;
1036
1037         AF_XDP_LOG(INFO, "Initializing pmd_af_xdp for %s\n",
1038                 rte_vdev_device_name(dev));
1039
1040         name = rte_vdev_device_name(dev);
1041         if (rte_eal_process_type() == RTE_PROC_SECONDARY &&
1042                 strlen(rte_vdev_device_args(dev)) == 0) {
1043                 eth_dev = rte_eth_dev_attach_secondary(name);
1044                 if (eth_dev == NULL) {
1045                         AF_XDP_LOG(ERR, "Failed to probe %s\n", name);
1046                         return -EINVAL;
1047                 }
1048                 eth_dev->dev_ops = &ops;
1049                 rte_eth_dev_probing_finish(eth_dev);
1050                 return 0;
1051         }
1052
1053         kvlist = rte_kvargs_parse(rte_vdev_device_args(dev), valid_arguments);
1054         if (kvlist == NULL) {
1055                 AF_XDP_LOG(ERR, "Invalid kvargs key\n");
1056                 return -EINVAL;
1057         }
1058
1059         if (dev->device.numa_node == SOCKET_ID_ANY)
1060                 dev->device.numa_node = rte_socket_id();
1061
1062         if (parse_parameters(kvlist, if_name, &xsk_start_queue_idx,
1063                              &xsk_queue_cnt, &pmd_zc) < 0) {
1064                 AF_XDP_LOG(ERR, "Invalid kvargs value\n");
1065                 return -EINVAL;
1066         }
1067
1068         if (strlen(if_name) == 0) {
1069                 AF_XDP_LOG(ERR, "Network interface must be specified\n");
1070                 return -EINVAL;
1071         }
1072
1073         eth_dev = init_internals(dev, if_name, xsk_start_queue_idx,
1074                                         xsk_queue_cnt, pmd_zc);
1075         if (eth_dev == NULL) {
1076                 AF_XDP_LOG(ERR, "Failed to init internals\n");
1077                 return -1;
1078         }
1079
1080         rte_eth_dev_probing_finish(eth_dev);
1081
1082         return 0;
1083 }
1084
1085 static int
1086 rte_pmd_af_xdp_remove(struct rte_vdev_device *dev)
1087 {
1088         struct rte_eth_dev *eth_dev = NULL;
1089
1090         AF_XDP_LOG(INFO, "Removing AF_XDP ethdev on numa socket %u\n",
1091                 rte_socket_id());
1092
1093         if (dev == NULL)
1094                 return -1;
1095
1096         /* find the ethdev entry */
1097         eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
1098         if (eth_dev == NULL)
1099                 return 0;
1100
1101         eth_dev_close(eth_dev);
1102         rte_eth_dev_release_port(eth_dev);
1103
1104
1105         return 0;
1106 }
1107
1108 static struct rte_vdev_driver pmd_af_xdp_drv = {
1109         .probe = rte_pmd_af_xdp_probe,
1110         .remove = rte_pmd_af_xdp_remove,
1111 };
1112
1113 RTE_PMD_REGISTER_VDEV(net_af_xdp, pmd_af_xdp_drv);
1114 RTE_PMD_REGISTER_PARAM_STRING(net_af_xdp,
1115                               "iface=<string> "
1116                               "start_queue=<int> "
1117                               "queue_count=<int> "
1118                               "pmd_zero_copy=<0|1>");
1119
1120 RTE_INIT(af_xdp_init_log)
1121 {
1122         af_xdp_logtype = rte_log_register("pmd.net.af_xdp");
1123         if (af_xdp_logtype >= 0)
1124                 rte_log_set_level(af_xdp_logtype, RTE_LOG_NOTICE);
1125 }