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