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