drivers/net/mlx4/mlx4.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2012 6WIND S.A.
   3  * Copyright 2012 Mellanox Technologies, Ltd
   4  */
   5
   6 /**
   7  * @file
   8  * mlx4 driver initialization.
   9  */
  10
  11 #include <errno.h>
  12 #include <inttypes.h>
  13 #include <stddef.h>
  14 #include <stdint.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <sys/mman.h>
  19 #include <unistd.h>
  20 #ifdef RTE_IBVERBS_LINK_DLOPEN
  21 #include <dlfcn.h>
  22 #endif
  23
  24 /* Verbs headers do not support -pedantic. */
  25 #ifdef PEDANTIC
  26 #pragma GCC diagnostic ignored "-Wpedantic"
  27 #endif
  28 #include <infiniband/verbs.h>
  29 #ifdef PEDANTIC
  30 #pragma GCC diagnostic error "-Wpedantic"
  31 #endif
  32
  33 #include <rte_common.h>
  34 #include <rte_dev.h>
  35 #include <rte_errno.h>
  36 #include <rte_ethdev_driver.h>
  37 #include <rte_ethdev_pci.h>
  38 #include <rte_ether.h>
  39 #include <rte_flow.h>
  40 #include <rte_interrupts.h>
  41 #include <rte_kvargs.h>
  42 #include <rte_malloc.h>
  43 #include <rte_mbuf.h>
  44
  45 #include "mlx4.h"
  46 #include "mlx4_glue.h"
  47 #include "mlx4_flow.h"
  48 #include "mlx4_mr.h"
  49 #include "mlx4_rxtx.h"
  50 #include "mlx4_utils.h"
  51
  52 #ifdef MLX4_GLUE
  53 const struct mlx4_glue *mlx4_glue;
  54 #endif
  55
  56 static const char *MZ_MLX4_PMD_SHARED_DATA = "mlx4_pmd_shared_data";
  57
  58 /* Shared memory between primary and secondary processes. */
  59 struct mlx4_shared_data *mlx4_shared_data;
  60
  61 /* Spinlock for mlx4_shared_data allocation. */
  62 static rte_spinlock_t mlx4_shared_data_lock = RTE_SPINLOCK_INITIALIZER;
  63
  64 /* Process local data for secondary processes. */
  65 static struct mlx4_local_data mlx4_local_data;
  66
  67 /** Configuration structure for device arguments. */
  68 struct mlx4_conf {
  69         struct {
  70                 uint32_t present; /**< Bit-field for existing ports. */
  71                 uint32_t enabled; /**< Bit-field for user-enabled ports. */
  72         } ports;
  73         int mr_ext_memseg_en;
  74         /** Whether memseg should be extended for MR creation. */
  75 };
  76
  77 /* Available parameters list. */
  78 const char *pmd_mlx4_init_params[] = {
  79         MLX4_PMD_PORT_KVARG,
  80         MLX4_MR_EXT_MEMSEG_EN_KVARG,
  81         NULL,
  82 };
  83
  84 static int mlx4_dev_stop(struct rte_eth_dev *dev);
  85
  86 /**
  87  * Initialize shared data between primary and secondary process.
  88  *
  89  * A memzone is reserved by primary process and secondary processes attach to
  90  * the memzone.
  91  *
  92  * @return
  93  *   0 on success, a negative errno value otherwise and rte_errno is set.
  94  */
  95 static int
  96 mlx4_init_shared_data(void)
  97 {
  98         const struct rte_memzone *mz;
  99         int ret = 0;
 100
 101         rte_spinlock_lock(&mlx4_shared_data_lock);
 102         if (mlx4_shared_data == NULL) {
 103                 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
 104                         /* Allocate shared memory. */
 105                         mz = rte_memzone_reserve(MZ_MLX4_PMD_SHARED_DATA,
 106                                                  sizeof(*mlx4_shared_data),
 107                                                  SOCKET_ID_ANY, 0);
 108                         if (mz == NULL) {
 109                                 ERROR("Cannot allocate mlx4 shared data\n");
 110                                 ret = -rte_errno;
 111                                 goto error;
 112                         }
 113                         mlx4_shared_data = mz->addr;
 114                         memset(mlx4_shared_data, 0, sizeof(*mlx4_shared_data));
 115                         rte_spinlock_init(&mlx4_shared_data->lock);
 116                 } else {
 117                         /* Lookup allocated shared memory. */
 118                         mz = rte_memzone_lookup(MZ_MLX4_PMD_SHARED_DATA);
 119                         if (mz == NULL) {
 120                                 ERROR("Cannot attach mlx4 shared data\n");
 121                                 ret = -rte_errno;
 122                                 goto error;
 123                         }
 124                         mlx4_shared_data = mz->addr;
 125                         memset(&mlx4_local_data, 0, sizeof(mlx4_local_data));
 126                 }
 127         }
 128 error:
 129         rte_spinlock_unlock(&mlx4_shared_data_lock);
 130         return ret;
 131 }
 132
 133 #ifdef HAVE_IBV_MLX4_BUF_ALLOCATORS
 134 /**
 135  * Verbs callback to allocate a memory. This function should allocate the space
 136  * according to the size provided residing inside a huge page.
 137  * Please note that all allocation must respect the alignment from libmlx4
 138  * (i.e. currently sysconf(_SC_PAGESIZE)).
 139  *
 140  * @param[in] size
 141  *   The size in bytes of the memory to allocate.
 142  * @param[in] data
 143  *   A pointer to the callback data.
 144  *
 145  * @return
 146  *   Allocated buffer, NULL otherwise and rte_errno is set.
 147  */
 148 static void *
 149 mlx4_alloc_verbs_buf(size_t size, void *data)
 150 {
 151         struct mlx4_priv *priv = data;
 152         void *ret;
 153         size_t alignment = sysconf(_SC_PAGESIZE);
 154         unsigned int socket = SOCKET_ID_ANY;
 155
 156         if (priv->verbs_alloc_ctx.type == MLX4_VERBS_ALLOC_TYPE_TX_QUEUE) {
 157                 const struct txq *txq = priv->verbs_alloc_ctx.obj;
 158
 159                 socket = txq->socket;
 160         } else if (priv->verbs_alloc_ctx.type ==
 161                    MLX4_VERBS_ALLOC_TYPE_RX_QUEUE) {
 162                 const struct rxq *rxq = priv->verbs_alloc_ctx.obj;
 163
 164                 socket = rxq->socket;
 165         }
 166         MLX4_ASSERT(data != NULL);
 167         ret = rte_malloc_socket(__func__, size, alignment, socket);
 168         if (!ret && size)
 169                 rte_errno = ENOMEM;
 170         return ret;
 171 }
 172
 173 /**
 174  * Verbs callback to free a memory.
 175  *
 176  * @param[in] ptr
 177  *   A pointer to the memory to free.
 178  * @param[in] data
 179  *   A pointer to the callback data.
 180  */
 181 static void
 182 mlx4_free_verbs_buf(void *ptr, void *data __rte_unused)
 183 {
 184         MLX4_ASSERT(data != NULL);
 185         rte_free(ptr);
 186 }
 187 #endif
 188
 189 /**
 190  * Initialize process private data structure.
 191  *
 192  * @param dev
 193  *   Pointer to Ethernet device structure.
 194  *
 195  * @return
 196  *   0 on success, a negative errno value otherwise and rte_errno is set.
 197  */
 198 static int
 199 mlx4_proc_priv_init(struct rte_eth_dev *dev)
 200 {
 201         struct mlx4_proc_priv *ppriv;
 202         size_t ppriv_size;
 203
 204         /*
 205          * UAR register table follows the process private structure. BlueFlame
 206          * registers for Tx queues are stored in the table.
 207          */
 208         ppriv_size = sizeof(struct mlx4_proc_priv) +
 209                      dev->data->nb_tx_queues * sizeof(void *);
 210         ppriv = rte_malloc_socket("mlx4_proc_priv", ppriv_size,
 211                                   RTE_CACHE_LINE_SIZE, dev->device->numa_node);
 212         if (!ppriv) {
 213                 rte_errno = ENOMEM;
 214                 return -rte_errno;
 215         }
 216         ppriv->uar_table_sz = ppriv_size;
 217         dev->process_private = ppriv;
 218         return 0;
 219 }
 220
 221 /**
 222  * Un-initialize process private data structure.
 223  *
 224  * @param dev
 225  *   Pointer to Ethernet device structure.
 226  */
 227 static void
 228 mlx4_proc_priv_uninit(struct rte_eth_dev *dev)
 229 {
 230         if (!dev->process_private)
 231                 return;
 232         rte_free(dev->process_private);
 233         dev->process_private = NULL;
 234 }
 235
 236 /**
 237  * DPDK callback for Ethernet device configuration.
 238  *
 239  * @param dev
 240  *   Pointer to Ethernet device structure.
 241  *
 242  * @return
 243  *   0 on success, negative errno value otherwise and rte_errno is set.
 244  */
 245 static int
 246 mlx4_dev_configure(struct rte_eth_dev *dev)
 247 {
 248         struct mlx4_priv *priv = dev->data->dev_private;
 249         struct rte_flow_error error;
 250         int ret;
 251
 252         /* Prepare internal flow rules. */
 253         ret = mlx4_flow_sync(priv, &error);
 254         if (ret) {
 255                 ERROR("cannot set up internal flow rules (code %d, \"%s\"),"
 256                       " flow error type %d, cause %p, message: %s",
 257                       -ret, strerror(-ret), error.type, error.cause,
 258                       error.message ? error.message : "(unspecified)");
 259                 goto exit;
 260         }
 261         ret = mlx4_intr_install(priv);
 262         if (ret) {
 263                 ERROR("%p: interrupt handler installation failed",
 264                       (void *)dev);
 265                 goto exit;
 266         }
 267         ret = mlx4_proc_priv_init(dev);
 268         if (ret) {
 269                 ERROR("%p: process private data allocation failed",
 270                       (void *)dev);
 271                 goto exit;
 272         }
 273 exit:
 274         return ret;
 275 }
 276
 277 /**
 278  * DPDK callback to start the device.
 279  *
 280  * Simulate device start by initializing common RSS resources and attaching
 281  * all configured flows.
 282  *
 283  * @param dev
 284  *   Pointer to Ethernet device structure.
 285  *
 286  * @return
 287  *   0 on success, negative errno value otherwise and rte_errno is set.
 288  */
 289 static int
 290 mlx4_dev_start(struct rte_eth_dev *dev)
 291 {
 292         struct mlx4_priv *priv = dev->data->dev_private;
 293         struct rte_flow_error error;
 294         int ret;
 295
 296         if (priv->started)
 297                 return 0;
 298         DEBUG("%p: attaching configured flows to all RX queues", (void *)dev);
 299         priv->started = 1;
 300         ret = mlx4_rss_init(priv);
 301         if (ret) {
 302                 ERROR("%p: cannot initialize RSS resources: %s",
 303                       (void *)dev, strerror(-ret));
 304                 goto err;
 305         }
 306 #ifdef RTE_LIBRTE_MLX4_DEBUG
 307         mlx4_mr_dump_dev(dev);
 308 #endif
 309         ret = mlx4_rxq_intr_enable(priv);
 310         if (ret) {
 311                 ERROR("%p: interrupt handler installation failed",
 312                      (void *)dev);
 313                 goto err;
 314         }
 315         ret = mlx4_flow_sync(priv, &error);
 316         if (ret) {
 317                 ERROR("%p: cannot attach flow rules (code %d, \"%s\"),"
 318                       " flow error type %d, cause %p, message: %s",
 319                       (void *)dev,
 320                       -ret, strerror(-ret), error.type, error.cause,
 321                       error.message ? error.message : "(unspecified)");
 322                 goto err;
 323         }
 324         rte_wmb();
 325         dev->tx_pkt_burst = mlx4_tx_burst;
 326         dev->rx_pkt_burst = mlx4_rx_burst;
 327         /* Enable datapath on secondary process. */
 328         mlx4_mp_req_start_rxtx(dev);
 329         return 0;
 330 err:
 331         mlx4_dev_stop(dev);
 332         return ret;
 333 }
 334
 335 /**
 336  * DPDK callback to stop the device.
 337  *
 338  * Simulate device stop by detaching all configured flows.
 339  *
 340  * @param dev
 341  *   Pointer to Ethernet device structure.
 342  */
 343 static int
 344 mlx4_dev_stop(struct rte_eth_dev *dev)
 345 {
 346         struct mlx4_priv *priv = dev->data->dev_private;
 347
 348         if (!priv->started)
 349                 return 0;
 350         DEBUG("%p: detaching flows from all RX queues", (void *)dev);
 351         priv->started = 0;
 352         dev->tx_pkt_burst = mlx4_tx_burst_removed;
 353         dev->rx_pkt_burst = mlx4_rx_burst_removed;
 354         rte_wmb();
 355         /* Disable datapath on secondary process. */
 356         mlx4_mp_req_stop_rxtx(dev);
 357         mlx4_flow_sync(priv, NULL);
 358         mlx4_rxq_intr_disable(priv);
 359         mlx4_rss_deinit(priv);
 360
 361         return 0;
 362 }
 363
 364 /**
 365  * DPDK callback to close the device.
 366  *
 367  * Destroy all queues and objects, free memory.
 368  *
 369  * @param dev
 370  *   Pointer to Ethernet device structure.
 371  */
 372 static int
 373 mlx4_dev_close(struct rte_eth_dev *dev)
 374 {
 375         struct mlx4_priv *priv = dev->data->dev_private;
 376         unsigned int i;
 377
 378         if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 379                 return 0;
 380         DEBUG("%p: closing device \"%s\"",
 381               (void *)dev,
 382               ((priv->ctx != NULL) ? priv->ctx->device->name : ""));
 383         dev->rx_pkt_burst = mlx4_rx_burst_removed;
 384         dev->tx_pkt_burst = mlx4_tx_burst_removed;
 385         rte_wmb();
 386         /* Disable datapath on secondary process. */
 387         mlx4_mp_req_stop_rxtx(dev);
 388         mlx4_flow_clean(priv);
 389         mlx4_rss_deinit(priv);
 390         for (i = 0; i != dev->data->nb_rx_queues; ++i)
 391                 mlx4_rx_queue_release(dev->data->rx_queues[i]);
 392         for (i = 0; i != dev->data->nb_tx_queues; ++i)
 393                 mlx4_tx_queue_release(dev->data->tx_queues[i]);
 394         mlx4_proc_priv_uninit(dev);
 395         mlx4_mr_release(dev);
 396         if (priv->pd != NULL) {
 397                 MLX4_ASSERT(priv->ctx != NULL);
 398                 claim_zero(mlx4_glue->dealloc_pd(priv->pd));
 399                 claim_zero(mlx4_glue->close_device(priv->ctx));
 400         } else
 401                 MLX4_ASSERT(priv->ctx == NULL);
 402         mlx4_intr_uninstall(priv);
 403         memset(priv, 0, sizeof(*priv));
 404         /* mac_addrs must not be freed because part of dev_private */
 405         dev->data->mac_addrs = NULL;
 406         return 0;
 407 }
 408
 409 static const struct eth_dev_ops mlx4_dev_ops = {
 410         .dev_configure = mlx4_dev_configure,
 411         .dev_start = mlx4_dev_start,
 412         .dev_stop = mlx4_dev_stop,
 413         .dev_set_link_down = mlx4_dev_set_link_down,
 414         .dev_set_link_up = mlx4_dev_set_link_up,
 415         .dev_close = mlx4_dev_close,
 416         .link_update = mlx4_link_update,
 417         .promiscuous_enable = mlx4_promiscuous_enable,
 418         .promiscuous_disable = mlx4_promiscuous_disable,
 419         .allmulticast_enable = mlx4_allmulticast_enable,
 420         .allmulticast_disable = mlx4_allmulticast_disable,
 421         .mac_addr_remove = mlx4_mac_addr_remove,
 422         .mac_addr_add = mlx4_mac_addr_add,
 423         .mac_addr_set = mlx4_mac_addr_set,
 424         .set_mc_addr_list = mlx4_set_mc_addr_list,
 425         .stats_get = mlx4_stats_get,
 426         .stats_reset = mlx4_stats_reset,
 427         .fw_version_get = mlx4_fw_version_get,
 428         .dev_infos_get = mlx4_dev_infos_get,
 429         .dev_supported_ptypes_get = mlx4_dev_supported_ptypes_get,
 430         .vlan_filter_set = mlx4_vlan_filter_set,
 431         .rx_queue_setup = mlx4_rx_queue_setup,
 432         .tx_queue_setup = mlx4_tx_queue_setup,
 433         .rx_queue_release = mlx4_rx_queue_release,
 434         .tx_queue_release = mlx4_tx_queue_release,
 435         .flow_ctrl_get = mlx4_flow_ctrl_get,
 436         .flow_ctrl_set = mlx4_flow_ctrl_set,
 437         .mtu_set = mlx4_mtu_set,
 438         .filter_ctrl = mlx4_filter_ctrl,
 439         .rx_queue_intr_enable = mlx4_rx_intr_enable,
 440         .rx_queue_intr_disable = mlx4_rx_intr_disable,
 441         .is_removed = mlx4_is_removed,
 442 };
 443
 444 /* Available operations from secondary process. */
 445 static const struct eth_dev_ops mlx4_dev_sec_ops = {
 446         .stats_get = mlx4_stats_get,
 447         .stats_reset = mlx4_stats_reset,
 448         .fw_version_get = mlx4_fw_version_get,
 449         .dev_infos_get = mlx4_dev_infos_get,
 450 };
 451
 452 /**
 453  * Get PCI information from struct ibv_device.
 454  *
 455  * @param device
 456  *   Pointer to Ethernet device structure.
 457  * @param[out] pci_addr
 458  *   PCI bus address output buffer.
 459  *
 460  * @return
 461  *   0 on success, negative errno value otherwise and rte_errno is set.
 462  */
 463 static int
 464 mlx4_ibv_device_to_pci_addr(const struct ibv_device *device,
 465                             struct rte_pci_addr *pci_addr)
 466 {
 467         FILE *file;
 468         char line[32];
 469         MKSTR(path, "%s/device/uevent", device->ibdev_path);
 470
 471         file = fopen(path, "rb");
 472         if (file == NULL) {
 473                 rte_errno = errno;
 474                 return -rte_errno;
 475         }
 476         while (fgets(line, sizeof(line), file) == line) {
 477                 size_t len = strlen(line);
 478                 int ret;
 479
 480                 /* Truncate long lines. */
 481                 if (len == (sizeof(line) - 1))
 482                         while (line[(len - 1)] != '\n') {
 483                                 ret = fgetc(file);
 484                                 if (ret == EOF)
 485                                         break;
 486                                 line[(len - 1)] = ret;
 487                         }
 488                 /* Extract information. */
 489                 if (sscanf(line,
 490                            "PCI_SLOT_NAME="
 491                            "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n",
 492                            &pci_addr->domain,
 493                            &pci_addr->bus,
 494                            &pci_addr->devid,
 495                            &pci_addr->function) == 4) {
 496                         break;
 497                 }
 498         }
 499         fclose(file);
 500         return 0;
 501 }
 502
 503 /**
 504  * Verify and store value for device argument.
 505  *
 506  * @param[in] key
 507  *   Key argument to verify.
 508  * @param[in] val
 509  *   Value associated with key.
 510  * @param[in, out] conf
 511  *   Shared configuration data.
 512  *
 513  * @return
 514  *   0 on success, negative errno value otherwise and rte_errno is set.
 515  */
 516 static int
 517 mlx4_arg_parse(const char *key, const char *val, struct mlx4_conf *conf)
 518 {
 519         unsigned long tmp;
 520
 521         errno = 0;
 522         tmp = strtoul(val, NULL, 0);
 523         if (errno) {
 524                 rte_errno = errno;
 525                 WARN("%s: \"%s\" is not a valid integer", key, val);
 526                 return -rte_errno;
 527         }
 528         if (strcmp(MLX4_PMD_PORT_KVARG, key) == 0) {
 529                 uint32_t ports = rte_log2_u32(conf->ports.present + 1);
 530
 531                 if (tmp >= ports) {
 532                         ERROR("port index %lu outside range [0,%" PRIu32 ")",
 533                               tmp, ports);
 534                         return -EINVAL;
 535                 }
 536                 if (!(conf->ports.present & (1 << tmp))) {
 537                         rte_errno = EINVAL;
 538                         ERROR("invalid port index %lu", tmp);
 539                         return -rte_errno;
 540                 }
 541                 conf->ports.enabled |= 1 << tmp;
 542         } else if (strcmp(MLX4_MR_EXT_MEMSEG_EN_KVARG, key) == 0) {
 543                 conf->mr_ext_memseg_en = !!tmp;
 544         } else {
 545                 rte_errno = EINVAL;
 546                 WARN("%s: unknown parameter", key);
 547                 return -rte_errno;
 548         }
 549         return 0;
 550 }
 551
 552 /**
 553  * Parse device parameters.
 554  *
 555  * @param devargs
 556  *   Device arguments structure.
 557  *
 558  * @return
 559  *   0 on success, negative errno value otherwise and rte_errno is set.
 560  */
 561 static int
 562 mlx4_args(struct rte_devargs *devargs, struct mlx4_conf *conf)
 563 {
 564         struct rte_kvargs *kvlist;
 565         unsigned int arg_count;
 566         int ret = 0;
 567         int i;
 568
 569         if (devargs == NULL)
 570                 return 0;
 571         kvlist = rte_kvargs_parse(devargs->args, pmd_mlx4_init_params);
 572         if (kvlist == NULL) {
 573                 rte_errno = EINVAL;
 574                 ERROR("failed to parse kvargs");
 575                 return -rte_errno;
 576         }
 577         /* Process parameters. */
 578         for (i = 0; pmd_mlx4_init_params[i]; ++i) {
 579                 arg_count = rte_kvargs_count(kvlist, pmd_mlx4_init_params[i]);
 580                 while (arg_count-- > 0) {
 581                         ret = rte_kvargs_process(kvlist,
 582                                                  pmd_mlx4_init_params[i],
 583                                                  (int (*)(const char *,
 584                                                           const char *,
 585                                                           void *))
 586                                                  mlx4_arg_parse,
 587                                                  conf);
 588                         if (ret != 0)
 589                                 goto free_kvlist;
 590                 }
 591         }
 592 free_kvlist:
 593         rte_kvargs_free(kvlist);
 594         return ret;
 595 }
 596
 597 /**
 598  * Interpret RSS capabilities reported by device.
 599  *
 600  * This function returns the set of usable Verbs RSS hash fields, kernel
 601  * quirks taken into account.
 602  *
 603  * @param ctx
 604  *   Verbs context.
 605  * @param pd
 606  *   Verbs protection domain.
 607  * @param device_attr_ex
 608  *   Extended device attributes to interpret.
 609  *
 610  * @return
 611  *   Usable RSS hash fields mask in Verbs format.
 612  */
 613 static uint64_t
 614 mlx4_hw_rss_sup(struct ibv_context *ctx, struct ibv_pd *pd,
 615                 struct ibv_device_attr_ex *device_attr_ex)
 616 {
 617         uint64_t hw_rss_sup = device_attr_ex->rss_caps.rx_hash_fields_mask;
 618         struct ibv_cq *cq = NULL;
 619         struct ibv_wq *wq = NULL;
 620         struct ibv_rwq_ind_table *ind = NULL;
 621         struct ibv_qp *qp = NULL;
 622
 623         if (!hw_rss_sup) {
 624                 WARN("no RSS capabilities reported; disabling support for UDP"
 625                      " RSS and inner VXLAN RSS");
 626                 return IBV_RX_HASH_SRC_IPV4 | IBV_RX_HASH_DST_IPV4 |
 627                         IBV_RX_HASH_SRC_IPV6 | IBV_RX_HASH_DST_IPV6 |
 628                         IBV_RX_HASH_SRC_PORT_TCP | IBV_RX_HASH_DST_PORT_TCP;
 629         }
 630         if (!(hw_rss_sup & IBV_RX_HASH_INNER))
 631                 return hw_rss_sup;
 632         /*
 633          * Although reported as supported, missing code in some Linux
 634          * versions (v4.15, v4.16) prevents the creation of hash QPs with
 635          * inner capability.
 636          *
 637          * There is no choice but to attempt to instantiate a temporary RSS
 638          * context in order to confirm its support.
 639          */
 640         cq = mlx4_glue->create_cq(ctx, 1, NULL, NULL, 0);
 641         wq = cq ? mlx4_glue->create_wq
 642                 (ctx,
 643                  &(struct ibv_wq_init_attr){
 644                         .wq_type = IBV_WQT_RQ,
 645                         .max_wr = 1,
 646                         .max_sge = 1,
 647                         .pd = pd,
 648                         .cq = cq,
 649                  }) : NULL;
 650         ind = wq ? mlx4_glue->create_rwq_ind_table
 651                 (ctx,
 652                  &(struct ibv_rwq_ind_table_init_attr){
 653                         .log_ind_tbl_size = 0,
 654                         .ind_tbl = &wq,
 655                         .comp_mask = 0,
 656                  }) : NULL;
 657         qp = ind ? mlx4_glue->create_qp_ex
 658                 (ctx,
 659                  &(struct ibv_qp_init_attr_ex){
 660                         .comp_mask =
 661                                 (IBV_QP_INIT_ATTR_PD |
 662                                  IBV_QP_INIT_ATTR_RX_HASH |
 663                                  IBV_QP_INIT_ATTR_IND_TABLE),
 664                         .qp_type = IBV_QPT_RAW_PACKET,
 665                         .pd = pd,
 666                         .rwq_ind_tbl = ind,
 667                         .rx_hash_conf = {
 668                                 .rx_hash_function = IBV_RX_HASH_FUNC_TOEPLITZ,
 669                                 .rx_hash_key_len = MLX4_RSS_HASH_KEY_SIZE,
 670                                 .rx_hash_key = mlx4_rss_hash_key_default,
 671                                 .rx_hash_fields_mask = hw_rss_sup,
 672                         },
 673                  }) : NULL;
 674         if (!qp) {
 675                 WARN("disabling unusable inner RSS capability due to kernel"
 676                      " quirk");
 677                 hw_rss_sup &= ~IBV_RX_HASH_INNER;
 678         } else {
 679                 claim_zero(mlx4_glue->destroy_qp(qp));
 680         }
 681         if (ind)
 682                 claim_zero(mlx4_glue->destroy_rwq_ind_table(ind));
 683         if (wq)
 684                 claim_zero(mlx4_glue->destroy_wq(wq));
 685         if (cq)
 686                 claim_zero(mlx4_glue->destroy_cq(cq));
 687         return hw_rss_sup;
 688 }
 689
 690 static struct rte_pci_driver mlx4_driver;
 691
 692 /**
 693  * PMD global initialization.
 694  *
 695  * Independent from individual device, this function initializes global
 696  * per-PMD data structures distinguishing primary and secondary processes.
 697  * Hence, each initialization is called once per a process.
 698  *
 699  * @return
 700  *   0 on success, a negative errno value otherwise and rte_errno is set.
 701  */
 702 static int
 703 mlx4_init_once(void)
 704 {
 705         struct mlx4_shared_data *sd;
 706         struct mlx4_local_data *ld = &mlx4_local_data;
 707         int ret = 0;
 708
 709         if (mlx4_init_shared_data())
 710                 return -rte_errno;
 711         sd = mlx4_shared_data;
 712         MLX4_ASSERT(sd);
 713         rte_spinlock_lock(&sd->lock);
 714         switch (rte_eal_process_type()) {
 715         case RTE_PROC_PRIMARY:
 716                 if (sd->init_done)
 717                         break;
 718                 LIST_INIT(&sd->mem_event_cb_list);
 719                 rte_rwlock_init(&sd->mem_event_rwlock);
 720                 rte_mem_event_callback_register("MLX4_MEM_EVENT_CB",
 721                                                 mlx4_mr_mem_event_cb, NULL);
 722                 ret = mlx4_mp_init_primary();
 723                 if (ret)
 724                         goto out;
 725                 sd->init_done = 1;
 726                 break;
 727         case RTE_PROC_SECONDARY:
 728                 if (ld->init_done)
 729                         break;
 730                 ret = mlx4_mp_init_secondary();
 731                 if (ret)
 732                         goto out;
 733                 ++sd->secondary_cnt;
 734                 ld->init_done = 1;
 735                 break;
 736         default:
 737                 break;
 738         }
 739 out:
 740         rte_spinlock_unlock(&sd->lock);
 741         return ret;
 742 }
 743
 744 /**
 745  * DPDK callback to register a PCI device.
 746  *
 747  * This function creates an Ethernet device for each port of a given
 748  * PCI device.
 749  *
 750  * @param[in] pci_drv
 751  *   PCI driver structure (mlx4_driver).
 752  * @param[in] pci_dev
 753  *   PCI device information.
 754  *
 755  * @return
 756  *   0 on success, negative errno value otherwise and rte_errno is set.
 757  */
 758 static int
 759 mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 760 {
 761         struct ibv_device **list;
 762         struct ibv_device *ibv_dev;
 763         int err = 0;
 764         struct ibv_context *attr_ctx = NULL;
 765         struct ibv_device_attr device_attr;
 766         struct ibv_device_attr_ex device_attr_ex;
 767         struct mlx4_conf conf = {
 768                 .ports.present = 0,
 769                 .mr_ext_memseg_en = 1,
 770         };
 771         unsigned int vf;
 772         int i;
 773         char ifname[IF_NAMESIZE];
 774
 775         (void)pci_drv;
 776         err = mlx4_init_once();
 777         if (err) {
 778                 ERROR("unable to init PMD global data: %s",
 779                       strerror(rte_errno));
 780                 return -rte_errno;
 781         }
 782         MLX4_ASSERT(pci_drv == &mlx4_driver);
 783         list = mlx4_glue->get_device_list(&i);
 784         if (list == NULL) {
 785                 rte_errno = errno;
 786                 MLX4_ASSERT(rte_errno);
 787                 if (rte_errno == ENOSYS)
 788                         ERROR("cannot list devices, is ib_uverbs loaded?");
 789                 return -rte_errno;
 790         }
 791         MLX4_ASSERT(i >= 0);
 792         /*
 793          * For each listed device, check related sysfs entry against
 794          * the provided PCI ID.
 795          */
 796         while (i != 0) {
 797                 struct rte_pci_addr pci_addr;
 798
 799                 --i;
 800                 DEBUG("checking device \"%s\"", list[i]->name);
 801                 if (mlx4_ibv_device_to_pci_addr(list[i], &pci_addr))
 802                         continue;
 803                 if ((pci_dev->addr.domain != pci_addr.domain) ||
 804                     (pci_dev->addr.bus != pci_addr.bus) ||
 805                     (pci_dev->addr.devid != pci_addr.devid) ||
 806                     (pci_dev->addr.function != pci_addr.function))
 807                         continue;
 808                 vf = (pci_dev->id.device_id ==
 809                       PCI_DEVICE_ID_MELLANOX_CONNECTX3VF);
 810                 INFO("PCI information matches, using device \"%s\" (VF: %s)",
 811                      list[i]->name, (vf ? "true" : "false"));
 812                 attr_ctx = mlx4_glue->open_device(list[i]);
 813                 err = errno;
 814                 break;
 815         }
 816         if (attr_ctx == NULL) {
 817                 mlx4_glue->free_device_list(list);
 818                 switch (err) {
 819                 case 0:
 820                         rte_errno = ENODEV;
 821                         ERROR("cannot access device, is mlx4_ib loaded?");
 822                         return -rte_errno;
 823                 case EINVAL:
 824                         rte_errno = EINVAL;
 825                         ERROR("cannot use device, are drivers up to date?");
 826                         return -rte_errno;
 827                 }
 828                 MLX4_ASSERT(err > 0);
 829                 rte_errno = err;
 830                 return -rte_errno;
 831         }
 832         ibv_dev = list[i];
 833         DEBUG("device opened");
 834         if (mlx4_glue->query_device(attr_ctx, &device_attr)) {
 835                 err = ENODEV;
 836                 goto error;
 837         }
 838         INFO("%u port(s) detected", device_attr.phys_port_cnt);
 839         conf.ports.present |= (UINT64_C(1) << device_attr.phys_port_cnt) - 1;
 840         if (mlx4_args(pci_dev->device.devargs, &conf)) {
 841                 ERROR("failed to process device arguments");
 842                 err = EINVAL;
 843                 goto error;
 844         }
 845         /* Use all ports when none are defined */
 846         if (!conf.ports.enabled)
 847                 conf.ports.enabled = conf.ports.present;
 848         /* Retrieve extended device attributes. */
 849         if (mlx4_glue->query_device_ex(attr_ctx, NULL, &device_attr_ex)) {
 850                 err = ENODEV;
 851                 goto error;
 852         }
 853         MLX4_ASSERT(device_attr.max_sge >= MLX4_MAX_SGE);
 854         for (i = 0; i < device_attr.phys_port_cnt; i++) {
 855                 uint32_t port = i + 1; /* ports are indexed from one */
 856                 struct ibv_context *ctx = NULL;
 857                 struct ibv_port_attr port_attr;
 858                 struct ibv_pd *pd = NULL;
 859                 struct mlx4_priv *priv = NULL;
 860                 struct rte_eth_dev *eth_dev = NULL;
 861                 struct rte_ether_addr mac;
 862                 char name[RTE_ETH_NAME_MAX_LEN];
 863
 864                 /* If port is not enabled, skip. */
 865                 if (!(conf.ports.enabled & (1 << i)))
 866                         continue;
 867                 DEBUG("using port %u", port);
 868                 ctx = mlx4_glue->open_device(ibv_dev);
 869                 if (ctx == NULL) {
 870                         err = ENODEV;
 871                         goto port_error;
 872                 }
 873                 snprintf(name, sizeof(name), "%s port %u",
 874                          mlx4_glue->get_device_name(ibv_dev), port);
 875                 if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
 876                         eth_dev = rte_eth_dev_attach_secondary(name);
 877                         if (eth_dev == NULL) {
 878                                 ERROR("can not attach rte ethdev");
 879                                 rte_errno = ENOMEM;
 880                                 err = rte_errno;
 881                                 goto error;
 882                         }
 883                         priv = eth_dev->data->dev_private;
 884                         if (!priv->verbs_alloc_ctx.enabled) {
 885                                 ERROR("secondary process is not supported"
 886                                       " due to lack of external allocator"
 887                                       " from Verbs");
 888                                 rte_errno = ENOTSUP;
 889                                 err = rte_errno;
 890                                 goto error;
 891                         }
 892                         eth_dev->device = &pci_dev->device;
 893                         eth_dev->dev_ops = &mlx4_dev_sec_ops;
 894                         err = mlx4_proc_priv_init(eth_dev);
 895                         if (err)
 896                                 goto error;
 897                         /* Receive command fd from primary process. */
 898                         err = mlx4_mp_req_verbs_cmd_fd(eth_dev);
 899                         if (err < 0) {
 900                                 err = rte_errno;
 901                                 goto error;
 902                         }
 903                         /* Remap UAR for Tx queues. */
 904                         err = mlx4_tx_uar_init_secondary(eth_dev, err);
 905                         if (err) {
 906                                 err = rte_errno;
 907                                 goto error;
 908                         }
 909                         /*
 910                          * Ethdev pointer is still required as input since
 911                          * the primary device is not accessible from the
 912                          * secondary process.
 913                          */
 914                         eth_dev->tx_pkt_burst = mlx4_tx_burst;
 915                         eth_dev->rx_pkt_burst = mlx4_rx_burst;
 916                         claim_zero(mlx4_glue->close_device(ctx));
 917                         rte_eth_copy_pci_info(eth_dev, pci_dev);
 918                         rte_eth_dev_probing_finish(eth_dev);
 919                         continue;
 920                 }
 921                 /* Check port status. */
 922                 err = mlx4_glue->query_port(ctx, port, &port_attr);
 923                 if (err) {
 924                         err = ENODEV;
 925                         ERROR("port query failed: %s", strerror(err));
 926                         goto port_error;
 927                 }
 928                 if (port_attr.link_layer != IBV_LINK_LAYER_ETHERNET) {
 929                         err = ENOTSUP;
 930                         ERROR("port %d is not configured in Ethernet mode",
 931                               port);
 932                         goto port_error;
 933                 }
 934                 if (port_attr.state != IBV_PORT_ACTIVE)
 935                         DEBUG("port %d is not active: \"%s\" (%d)",
 936                               port, mlx4_glue->port_state_str(port_attr.state),
 937                               port_attr.state);
 938                 /* Make asynchronous FD non-blocking to handle interrupts. */
 939                 err = mlx4_fd_set_non_blocking(ctx->async_fd);
 940                 if (err) {
 941                         ERROR("cannot make asynchronous FD non-blocking: %s",
 942                               strerror(err));
 943                         goto port_error;
 944                 }
 945                 /* Allocate protection domain. */
 946                 pd = mlx4_glue->alloc_pd(ctx);
 947                 if (pd == NULL) {
 948                         err = ENOMEM;
 949                         ERROR("PD allocation failure");
 950                         goto port_error;
 951                 }
 952                 /* from rte_ethdev.c */
 953                 priv = rte_zmalloc("ethdev private structure",
 954                                    sizeof(*priv),
 955                                    RTE_CACHE_LINE_SIZE);
 956                 if (priv == NULL) {
 957                         err = ENOMEM;
 958                         ERROR("priv allocation failure");
 959                         goto port_error;
 960                 }
 961                 priv->ctx = ctx;
 962                 priv->device_attr = device_attr;
 963                 priv->port = port;
 964                 priv->pd = pd;
 965                 priv->mtu = RTE_ETHER_MTU;
 966                 priv->vf = vf;
 967                 priv->hw_csum = !!(device_attr.device_cap_flags &
 968                                    IBV_DEVICE_RAW_IP_CSUM);
 969                 DEBUG("checksum offloading is %ssupported",
 970                       (priv->hw_csum ? "" : "not "));
 971                 /* Only ConnectX-3 Pro supports tunneling. */
 972                 priv->hw_csum_l2tun =
 973                         priv->hw_csum &&
 974                         (device_attr.vendor_part_id ==
 975                          PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO);
 976                 DEBUG("L2 tunnel checksum offloads are %ssupported",
 977                       priv->hw_csum_l2tun ? "" : "not ");
 978                 priv->hw_rss_sup = mlx4_hw_rss_sup(priv->ctx, priv->pd,
 979                                                    &device_attr_ex);
 980                 DEBUG("supported RSS hash fields mask: %016" PRIx64,
 981                       priv->hw_rss_sup);
 982                 priv->hw_rss_max_qps =
 983                         device_attr_ex.rss_caps.max_rwq_indirection_table_size;
 984                 DEBUG("MAX RSS queues %d", priv->hw_rss_max_qps);
 985                 priv->hw_fcs_strip = !!(device_attr_ex.raw_packet_caps &
 986                                         IBV_RAW_PACKET_CAP_SCATTER_FCS);
 987                 DEBUG("FCS stripping toggling is %ssupported",
 988                       priv->hw_fcs_strip ? "" : "not ");
 989                 priv->tso =
 990                         ((device_attr_ex.tso_caps.max_tso > 0) &&
 991                          (device_attr_ex.tso_caps.supported_qpts &
 992                           (1 << IBV_QPT_RAW_PACKET)));
 993                 if (priv->tso)
 994                         priv->tso_max_payload_sz =
 995                                         device_attr_ex.tso_caps.max_tso;
 996                 DEBUG("TSO is %ssupported",
 997                       priv->tso ? "" : "not ");
 998                 priv->mr_ext_memseg_en = conf.mr_ext_memseg_en;
 999                 /* Configure the first MAC address by default. */
1000                 err = mlx4_get_mac(priv, &mac.addr_bytes);
1001                 if (err) {
1002                         ERROR("cannot get MAC address, is mlx4_en loaded?"
1003                               " (error: %s)", strerror(err));
1004                         goto port_error;
1005                 }
1006                 INFO("port %u MAC address is %02x:%02x:%02x:%02x:%02x:%02x",
1007                      priv->port,
1008                      mac.addr_bytes[0], mac.addr_bytes[1],
1009                      mac.addr_bytes[2], mac.addr_bytes[3],
1010                      mac.addr_bytes[4], mac.addr_bytes[5]);
1011                 /* Register MAC address. */
1012                 priv->mac[0] = mac;
1013
1014                 if (mlx4_get_ifname(priv, &ifname) == 0) {
1015                         DEBUG("port %u ifname is \"%s\"",
1016                               priv->port, ifname);
1017                         priv->if_index = if_nametoindex(ifname);
1018                 } else {
1019                         DEBUG("port %u ifname is unknown", priv->port);
1020                 }
1021
1022                 /* Get actual MTU if possible. */
1023                 mlx4_mtu_get(priv, &priv->mtu);
1024                 DEBUG("port %u MTU is %u", priv->port, priv->mtu);
1025                 eth_dev = rte_eth_dev_allocate(name);
1026                 if (eth_dev == NULL) {
1027                         err = ENOMEM;
1028                         ERROR("can not allocate rte ethdev");
1029                         goto port_error;
1030                 }
1031                 eth_dev->data->dev_private = priv;
1032                 eth_dev->data->mac_addrs = priv->mac;
1033                 eth_dev->device = &pci_dev->device;
1034                 rte_eth_copy_pci_info(eth_dev, pci_dev);
1035                 eth_dev->data->dev_flags |= RTE_ETH_DEV_AUTOFILL_QUEUE_XSTATS;
1036                 /* Initialize local interrupt handle for current port. */
1037                 memset(&priv->intr_handle, 0, sizeof(struct rte_intr_handle));
1038                 priv->intr_handle.fd = -1;
1039                 priv->intr_handle.type = RTE_INTR_HANDLE_EXT;
1040                 /*
1041                  * Override ethdev interrupt handle pointer with private
1042                  * handle instead of that of the parent PCI device used by
1043                  * default. This prevents it from being shared between all
1044                  * ports of the same PCI device since each of them is
1045                  * associated its own Verbs context.
1046                  *
1047                  * Rx interrupts in particular require this as the PMD has
1048                  * no control over the registration of queue interrupts
1049                  * besides setting up eth_dev->intr_handle, the rest is
1050                  * handled by rte_intr_rx_ctl().
1051                  */
1052                 eth_dev->intr_handle = &priv->intr_handle;
1053                 priv->dev_data = eth_dev->data;
1054                 eth_dev->dev_ops = &mlx4_dev_ops;
1055 #ifdef HAVE_IBV_MLX4_BUF_ALLOCATORS
1056                 /* Hint libmlx4 to use PMD allocator for data plane resources */
1057                 err = mlx4_glue->dv_set_context_attr
1058                         (ctx, MLX4DV_SET_CTX_ATTR_BUF_ALLOCATORS,
1059                          (void *)((uintptr_t)&(struct mlx4dv_ctx_allocators){
1060                                  .alloc = &mlx4_alloc_verbs_buf,
1061                                  .free = &mlx4_free_verbs_buf,
1062                                  .data = priv,
1063                         }));
1064                 if (err)
1065                         WARN("Verbs external allocator is not supported");
1066                 else
1067                         priv->verbs_alloc_ctx.enabled = 1;
1068 #endif
1069                 /* Bring Ethernet device up. */
1070                 DEBUG("forcing Ethernet interface up");
1071                 mlx4_dev_set_link_up(eth_dev);
1072                 /* Update link status once if waiting for LSC. */
1073                 if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
1074                         mlx4_link_update(eth_dev, 0);
1075                 /*
1076                  * Once the device is added to the list of memory event
1077                  * callback, its global MR cache table cannot be expanded
1078                  * on the fly because of deadlock. If it overflows, lookup
1079                  * should be done by searching MR list linearly, which is slow.
1080                  */
1081                 err = mlx4_mr_btree_init(&priv->mr.cache,
1082                                          MLX4_MR_BTREE_CACHE_N * 2,
1083                                          eth_dev->device->numa_node);
1084                 if (err) {
1085                         /* rte_errno is already set. */
1086                         goto port_error;
1087                 }
1088                 /* Add device to memory callback list. */
1089                 rte_rwlock_write_lock(&mlx4_shared_data->mem_event_rwlock);
1090                 LIST_INSERT_HEAD(&mlx4_shared_data->mem_event_cb_list,
1091                                  priv, mem_event_cb);
1092                 rte_rwlock_write_unlock(&mlx4_shared_data->mem_event_rwlock);
1093                 rte_eth_dev_probing_finish(eth_dev);
1094                 continue;
1095 port_error:
1096                 rte_free(priv);
1097                 if (eth_dev != NULL)
1098                         eth_dev->data->dev_private = NULL;
1099                 if (pd)
1100                         claim_zero(mlx4_glue->dealloc_pd(pd));
1101                 if (ctx)
1102                         claim_zero(mlx4_glue->close_device(ctx));
1103                 if (eth_dev != NULL) {
1104                         /* mac_addrs must not be freed because part of dev_private */
1105                         eth_dev->data->mac_addrs = NULL;
1106                         rte_eth_dev_release_port(eth_dev);
1107                 }
1108                 break;
1109         }
1110         /*
1111          * XXX if something went wrong in the loop above, there is a resource
1112          * leak (ctx, pd, priv, dpdk ethdev) but we can do nothing about it as
1113          * long as the dpdk does not provide a way to deallocate a ethdev and a
1114          * way to enumerate the registered ethdevs to free the previous ones.
1115          */
1116 error:
1117         if (attr_ctx)
1118                 claim_zero(mlx4_glue->close_device(attr_ctx));
1119         if (list)
1120                 mlx4_glue->free_device_list(list);
1121         if (err)
1122                 rte_errno = err;
1123         return -err;
1124 }
1125
1126 static const struct rte_pci_id mlx4_pci_id_map[] = {
1127         {
1128                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1129                                PCI_DEVICE_ID_MELLANOX_CONNECTX3)
1130         },
1131         {
1132                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1133                                PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO)
1134         },
1135         {
1136                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1137                                PCI_DEVICE_ID_MELLANOX_CONNECTX3VF)
1138         },
1139         {
1140                 .vendor_id = 0
1141         }
1142 };
1143
1144 static struct rte_pci_driver mlx4_driver = {
1145         .driver = {
1146                 .name = MLX4_DRIVER_NAME
1147         },
1148         .id_table = mlx4_pci_id_map,
1149         .probe = mlx4_pci_probe,
1150         .drv_flags = RTE_PCI_DRV_INTR_LSC | RTE_PCI_DRV_INTR_RMV,
1151 };
1152
1153 #ifdef RTE_IBVERBS_LINK_DLOPEN
1154
1155 /**
1156  * Suffix RTE_EAL_PMD_PATH with "-glue".
1157  *
1158  * This function performs a sanity check on RTE_EAL_PMD_PATH before
1159  * suffixing its last component.
1160  *
1161  * @param buf[out]
1162  *   Output buffer, should be large enough otherwise NULL is returned.
1163  * @param size
1164  *   Size of @p out.
1165  *
1166  * @return
1167  *   Pointer to @p buf or @p NULL in case suffix cannot be appended.
1168  */
1169 static char *
1170 mlx4_glue_path(char *buf, size_t size)
1171 {
1172         static const char *const bad[] = { "/", ".", "..", NULL };
1173         const char *path = RTE_EAL_PMD_PATH;
1174         size_t len = strlen(path);
1175         size_t off;
1176         int i;
1177
1178         while (len && path[len - 1] == '/')
1179                 --len;
1180         for (off = len; off && path[off - 1] != '/'; --off)
1181                 ;
1182         for (i = 0; bad[i]; ++i)
1183                 if (!strncmp(path + off, bad[i], (int)(len - off)))
1184                         goto error;
1185         i = snprintf(buf, size, "%.*s-glue", (int)len, path);
1186         if (i == -1 || (size_t)i >= size)
1187                 goto error;
1188         return buf;
1189 error:
1190         ERROR("unable to append \"-glue\" to last component of"
1191               " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"),"
1192               " please re-configure DPDK");
1193         return NULL;
1194 }
1195
1196 /**
1197  * Initialization routine for run-time dependency on rdma-core.
1198  */
1199 static int
1200 mlx4_glue_init(void)
1201 {
1202         char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
1203         const char *path[] = {
1204                 /*
1205                  * A basic security check is necessary before trusting
1206                  * MLX4_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
1207                  */
1208                 (geteuid() == getuid() && getegid() == getgid() ?
1209                  getenv("MLX4_GLUE_PATH") : NULL),
1210                 /*
1211                  * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
1212                  * variant, otherwise let dlopen() look up libraries on its
1213                  * own.
1214                  */
1215                 (*RTE_EAL_PMD_PATH ?
1216                  mlx4_glue_path(glue_path, sizeof(glue_path)) : ""),
1217         };
1218         unsigned int i = 0;
1219         void *handle = NULL;
1220         void **sym;
1221         const char *dlmsg;
1222
1223         while (!handle && i != RTE_DIM(path)) {
1224                 const char *end;
1225                 size_t len;
1226                 int ret;
1227
1228                 if (!path[i]) {
1229                         ++i;
1230                         continue;
1231                 }
1232                 end = strpbrk(path[i], ":;");
1233                 if (!end)
1234                         end = path[i] + strlen(path[i]);
1235                 len = end - path[i];
1236                 ret = 0;
1237                 do {
1238                         char name[ret + 1];
1239
1240                         ret = snprintf(name, sizeof(name), "%.*s%s" MLX4_GLUE,
1241                                        (int)len, path[i],
1242                                        (!len || *(end - 1) == '/') ? "" : "/");
1243                         if (ret == -1)
1244                                 break;
1245                         if (sizeof(name) != (size_t)ret + 1)
1246                                 continue;
1247                         DEBUG("looking for rdma-core glue as \"%s\"", name);
1248                         handle = dlopen(name, RTLD_LAZY);
1249                         break;
1250                 } while (1);
1251                 path[i] = end + 1;
1252                 if (!*end)
1253                         ++i;
1254         }
1255         if (!handle) {
1256                 rte_errno = EINVAL;
1257                 dlmsg = dlerror();
1258                 if (dlmsg)
1259                         WARN("cannot load glue library: %s", dlmsg);
1260                 goto glue_error;
1261         }
1262         sym = dlsym(handle, "mlx4_glue");
1263         if (!sym || !*sym) {
1264                 rte_errno = EINVAL;
1265                 dlmsg = dlerror();
1266                 if (dlmsg)
1267                         ERROR("cannot resolve glue symbol: %s", dlmsg);
1268                 goto glue_error;
1269         }
1270         mlx4_glue = *sym;
1271         return 0;
1272 glue_error:
1273         if (handle)
1274                 dlclose(handle);
1275         WARN("cannot initialize PMD due to missing run-time"
1276              " dependency on rdma-core libraries (libibverbs,"
1277              " libmlx4)");
1278         return -rte_errno;
1279 }
1280
1281 #endif
1282
1283 /* Initialize driver log type. */
1284 RTE_LOG_REGISTER(mlx4_logtype, pmd.net.mlx4, NOTICE)
1285
1286 /**
1287  * Driver initialization routine.
1288  */
1289 RTE_INIT(rte_mlx4_pmd_init)
1290 {
1291         /*
1292          * MLX4_DEVICE_FATAL_CLEANUP tells ibv_destroy functions we
1293          * want to get success errno value in case of calling them
1294          * when the device was removed.
1295          */
1296         setenv("MLX4_DEVICE_FATAL_CLEANUP", "1", 1);
1297         /*
1298          * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
1299          * huge pages. Calling ibv_fork_init() during init allows
1300          * applications to use fork() safely for purposes other than
1301          * using this PMD, which is not supported in forked processes.
1302          */
1303         setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
1304 #ifdef RTE_IBVERBS_LINK_DLOPEN
1305         if (mlx4_glue_init())
1306                 return;
1307         MLX4_ASSERT(mlx4_glue);
1308 #endif
1309 #ifdef RTE_LIBRTE_MLX4_DEBUG
1310         /* Glue structure must not contain any NULL pointers. */
1311         {
1312                 unsigned int i;
1313
1314                 for (i = 0; i != sizeof(*mlx4_glue) / sizeof(void *); ++i)
1315                         MLX4_ASSERT(((const void *const *)mlx4_glue)[i]);
1316         }
1317 #endif
1318         if (strcmp(mlx4_glue->version, MLX4_GLUE_VERSION)) {
1319                 ERROR("rdma-core glue \"%s\" mismatch: \"%s\" is required",
1320                       mlx4_glue->version, MLX4_GLUE_VERSION);
1321                 return;
1322         }
1323         mlx4_glue->fork_init();
1324         rte_pci_register(&mlx4_driver);
1325 }
1326
1327 RTE_PMD_EXPORT_NAME(net_mlx4, __COUNTER__);
1328 RTE_PMD_REGISTER_PCI_TABLE(net_mlx4, mlx4_pci_id_map);
1329 RTE_PMD_REGISTER_KMOD_DEP(net_mlx4,
1330         "* ib_uverbs & mlx4_en & mlx4_core & mlx4_ib");