drivers/net/mlx4/mlx4.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2012 6WIND S.A.
   3  * Copyright 2012 Mellanox Technologies, Ltd
   4  */
   5
   6 /**
   7  * @file
   8  * mlx4 driver initialization.
   9  */
  10
  11 #include <errno.h>
  12 #include <inttypes.h>
  13 #include <stddef.h>
  14 #include <stdint.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <sys/mman.h>
  19 #include <unistd.h>
  20 #ifdef RTE_IBVERBS_LINK_DLOPEN
  21 #include <dlfcn.h>
  22 #endif
  23
  24 /* Verbs headers do not support -pedantic. */
  25 #ifdef PEDANTIC
  26 #pragma GCC diagnostic ignored "-Wpedantic"
  27 #endif
  28 #include <infiniband/verbs.h>
  29 #ifdef PEDANTIC
  30 #pragma GCC diagnostic error "-Wpedantic"
  31 #endif
  32
  33 #include <rte_common.h>
  34 #include <rte_dev.h>
  35 #include <rte_errno.h>
  36 #include <rte_ethdev_driver.h>
  37 #include <rte_ethdev_pci.h>
  38 #include <rte_ether.h>
  39 #include <rte_flow.h>
  40 #include <rte_interrupts.h>
  41 #include <rte_kvargs.h>
  42 #include <rte_malloc.h>
  43 #include <rte_mbuf.h>
  44
  45 #include "mlx4.h"
  46 #include "mlx4_glue.h"
  47 #include "mlx4_flow.h"
  48 #include "mlx4_mr.h"
  49 #include "mlx4_rxtx.h"
  50 #include "mlx4_utils.h"
  51
  52 #ifdef MLX4_GLUE
  53 const struct mlx4_glue *mlx4_glue;
  54 #endif
  55
  56 static const char *MZ_MLX4_PMD_SHARED_DATA = "mlx4_pmd_shared_data";
  57
  58 /* Shared memory between primary and secondary processes. */
  59 struct mlx4_shared_data *mlx4_shared_data;
  60
  61 /* Spinlock for mlx4_shared_data allocation. */
  62 static rte_spinlock_t mlx4_shared_data_lock = RTE_SPINLOCK_INITIALIZER;
  63
  64 /* Process local data for secondary processes. */
  65 static struct mlx4_local_data mlx4_local_data;
  66
  67 /** Driver-specific log messages type. */
  68 int mlx4_logtype;
  69
  70 /** Configuration structure for device arguments. */
  71 struct mlx4_conf {
  72         struct {
  73                 uint32_t present; /**< Bit-field for existing ports. */
  74                 uint32_t enabled; /**< Bit-field for user-enabled ports. */
  75         } ports;
  76         int mr_ext_memseg_en;
  77         /** Whether memseg should be extended for MR creation. */
  78 };
  79
  80 /* Available parameters list. */
  81 const char *pmd_mlx4_init_params[] = {
  82         MLX4_PMD_PORT_KVARG,
  83         MLX4_MR_EXT_MEMSEG_EN_KVARG,
  84         NULL,
  85 };
  86
  87 static void mlx4_dev_stop(struct rte_eth_dev *dev);
  88
  89 /**
  90  * Initialize shared data between primary and secondary process.
  91  *
  92  * A memzone is reserved by primary process and secondary processes attach to
  93  * the memzone.
  94  *
  95  * @return
  96  *   0 on success, a negative errno value otherwise and rte_errno is set.
  97  */
  98 static int
  99 mlx4_init_shared_data(void)
 100 {
 101         const struct rte_memzone *mz;
 102         int ret = 0;
 103
 104         rte_spinlock_lock(&mlx4_shared_data_lock);
 105         if (mlx4_shared_data == NULL) {
 106                 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
 107                         /* Allocate shared memory. */
 108                         mz = rte_memzone_reserve(MZ_MLX4_PMD_SHARED_DATA,
 109                                                  sizeof(*mlx4_shared_data),
 110                                                  SOCKET_ID_ANY, 0);
 111                         if (mz == NULL) {
 112                                 ERROR("Cannot allocate mlx4 shared data\n");
 113                                 ret = -rte_errno;
 114                                 goto error;
 115                         }
 116                         mlx4_shared_data = mz->addr;
 117                         memset(mlx4_shared_data, 0, sizeof(*mlx4_shared_data));
 118                         rte_spinlock_init(&mlx4_shared_data->lock);
 119                 } else {
 120                         /* Lookup allocated shared memory. */
 121                         mz = rte_memzone_lookup(MZ_MLX4_PMD_SHARED_DATA);
 122                         if (mz == NULL) {
 123                                 ERROR("Cannot attach mlx4 shared data\n");
 124                                 ret = -rte_errno;
 125                                 goto error;
 126                         }
 127                         mlx4_shared_data = mz->addr;
 128                         memset(&mlx4_local_data, 0, sizeof(mlx4_local_data));
 129                 }
 130         }
 131 error:
 132         rte_spinlock_unlock(&mlx4_shared_data_lock);
 133         return ret;
 134 }
 135
 136 #ifdef HAVE_IBV_MLX4_BUF_ALLOCATORS
 137 /**
 138  * Verbs callback to allocate a memory. This function should allocate the space
 139  * according to the size provided residing inside a huge page.
 140  * Please note that all allocation must respect the alignment from libmlx4
 141  * (i.e. currently sysconf(_SC_PAGESIZE)).
 142  *
 143  * @param[in] size
 144  *   The size in bytes of the memory to allocate.
 145  * @param[in] data
 146  *   A pointer to the callback data.
 147  *
 148  * @return
 149  *   Allocated buffer, NULL otherwise and rte_errno is set.
 150  */
 151 static void *
 152 mlx4_alloc_verbs_buf(size_t size, void *data)
 153 {
 154         struct mlx4_priv *priv = data;
 155         void *ret;
 156         size_t alignment = sysconf(_SC_PAGESIZE);
 157         unsigned int socket = SOCKET_ID_ANY;
 158
 159         if (priv->verbs_alloc_ctx.type == MLX4_VERBS_ALLOC_TYPE_TX_QUEUE) {
 160                 const struct txq *txq = priv->verbs_alloc_ctx.obj;
 161
 162                 socket = txq->socket;
 163         } else if (priv->verbs_alloc_ctx.type ==
 164                    MLX4_VERBS_ALLOC_TYPE_RX_QUEUE) {
 165                 const struct rxq *rxq = priv->verbs_alloc_ctx.obj;
 166
 167                 socket = rxq->socket;
 168         }
 169         MLX4_ASSERT(data != NULL);
 170         ret = rte_malloc_socket(__func__, size, alignment, socket);
 171         if (!ret && size)
 172                 rte_errno = ENOMEM;
 173         return ret;
 174 }
 175
 176 /**
 177  * Verbs callback to free a memory.
 178  *
 179  * @param[in] ptr
 180  *   A pointer to the memory to free.
 181  * @param[in] data
 182  *   A pointer to the callback data.
 183  */
 184 static void
 185 mlx4_free_verbs_buf(void *ptr, void *data __rte_unused)
 186 {
 187         MLX4_ASSERT(data != NULL);
 188         rte_free(ptr);
 189 }
 190 #endif
 191
 192 /**
 193  * Initialize process private data structure.
 194  *
 195  * @param dev
 196  *   Pointer to Ethernet device structure.
 197  *
 198  * @return
 199  *   0 on success, a negative errno value otherwise and rte_errno is set.
 200  */
 201 static int
 202 mlx4_proc_priv_init(struct rte_eth_dev *dev)
 203 {
 204         struct mlx4_proc_priv *ppriv;
 205         size_t ppriv_size;
 206
 207         /*
 208          * UAR register table follows the process private structure. BlueFlame
 209          * registers for Tx queues are stored in the table.
 210          */
 211         ppriv_size = sizeof(struct mlx4_proc_priv) +
 212                      dev->data->nb_tx_queues * sizeof(void *);
 213         ppriv = rte_malloc_socket("mlx4_proc_priv", ppriv_size,
 214                                   RTE_CACHE_LINE_SIZE, dev->device->numa_node);
 215         if (!ppriv) {
 216                 rte_errno = ENOMEM;
 217                 return -rte_errno;
 218         }
 219         ppriv->uar_table_sz = ppriv_size;
 220         dev->process_private = ppriv;
 221         return 0;
 222 }
 223
 224 /**
 225  * Un-initialize process private data structure.
 226  *
 227  * @param dev
 228  *   Pointer to Ethernet device structure.
 229  */
 230 static void
 231 mlx4_proc_priv_uninit(struct rte_eth_dev *dev)
 232 {
 233         if (!dev->process_private)
 234                 return;
 235         rte_free(dev->process_private);
 236         dev->process_private = NULL;
 237 }
 238
 239 /**
 240  * DPDK callback for Ethernet device configuration.
 241  *
 242  * @param dev
 243  *   Pointer to Ethernet device structure.
 244  *
 245  * @return
 246  *   0 on success, negative errno value otherwise and rte_errno is set.
 247  */
 248 static int
 249 mlx4_dev_configure(struct rte_eth_dev *dev)
 250 {
 251         struct mlx4_priv *priv = dev->data->dev_private;
 252         struct rte_flow_error error;
 253         int ret;
 254
 255         if (dev->data->dev_conf.rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG)
 256                 dev->data->dev_conf.rxmode.offloads |= DEV_RX_OFFLOAD_RSS_HASH;
 257
 258         /* Prepare internal flow rules. */
 259         ret = mlx4_flow_sync(priv, &error);
 260         if (ret) {
 261                 ERROR("cannot set up internal flow rules (code %d, \"%s\"),"
 262                       " flow error type %d, cause %p, message: %s",
 263                       -ret, strerror(-ret), error.type, error.cause,
 264                       error.message ? error.message : "(unspecified)");
 265                 goto exit;
 266         }
 267         ret = mlx4_intr_install(priv);
 268         if (ret) {
 269                 ERROR("%p: interrupt handler installation failed",
 270                       (void *)dev);
 271                 goto exit;
 272         }
 273         ret = mlx4_proc_priv_init(dev);
 274         if (ret) {
 275                 ERROR("%p: process private data allocation failed",
 276                       (void *)dev);
 277                 goto exit;
 278         }
 279 exit:
 280         return ret;
 281 }
 282
 283 /**
 284  * DPDK callback to start the device.
 285  *
 286  * Simulate device start by initializing common RSS resources and attaching
 287  * all configured flows.
 288  *
 289  * @param dev
 290  *   Pointer to Ethernet device structure.
 291  *
 292  * @return
 293  *   0 on success, negative errno value otherwise and rte_errno is set.
 294  */
 295 static int
 296 mlx4_dev_start(struct rte_eth_dev *dev)
 297 {
 298         struct mlx4_priv *priv = dev->data->dev_private;
 299         struct rte_flow_error error;
 300         int ret;
 301
 302         if (priv->started)
 303                 return 0;
 304         DEBUG("%p: attaching configured flows to all RX queues", (void *)dev);
 305         priv->started = 1;
 306         ret = mlx4_rss_init(priv);
 307         if (ret) {
 308                 ERROR("%p: cannot initialize RSS resources: %s",
 309                       (void *)dev, strerror(-ret));
 310                 goto err;
 311         }
 312 #ifdef RTE_LIBRTE_MLX4_DEBUG
 313         mlx4_mr_dump_dev(dev);
 314 #endif
 315         ret = mlx4_rxq_intr_enable(priv);
 316         if (ret) {
 317                 ERROR("%p: interrupt handler installation failed",
 318                      (void *)dev);
 319                 goto err;
 320         }
 321         ret = mlx4_flow_sync(priv, &error);
 322         if (ret) {
 323                 ERROR("%p: cannot attach flow rules (code %d, \"%s\"),"
 324                       " flow error type %d, cause %p, message: %s",
 325                       (void *)dev,
 326                       -ret, strerror(-ret), error.type, error.cause,
 327                       error.message ? error.message : "(unspecified)");
 328                 goto err;
 329         }
 330         rte_wmb();
 331         dev->tx_pkt_burst = mlx4_tx_burst;
 332         dev->rx_pkt_burst = mlx4_rx_burst;
 333         /* Enable datapath on secondary process. */
 334         mlx4_mp_req_start_rxtx(dev);
 335         return 0;
 336 err:
 337         mlx4_dev_stop(dev);
 338         return ret;
 339 }
 340
 341 /**
 342  * DPDK callback to stop the device.
 343  *
 344  * Simulate device stop by detaching all configured flows.
 345  *
 346  * @param dev
 347  *   Pointer to Ethernet device structure.
 348  */
 349 static void
 350 mlx4_dev_stop(struct rte_eth_dev *dev)
 351 {
 352         struct mlx4_priv *priv = dev->data->dev_private;
 353
 354         if (!priv->started)
 355                 return;
 356         DEBUG("%p: detaching flows from all RX queues", (void *)dev);
 357         priv->started = 0;
 358         dev->tx_pkt_burst = mlx4_tx_burst_removed;
 359         dev->rx_pkt_burst = mlx4_rx_burst_removed;
 360         rte_wmb();
 361         /* Disable datapath on secondary process. */
 362         mlx4_mp_req_stop_rxtx(dev);
 363         mlx4_flow_sync(priv, NULL);
 364         mlx4_rxq_intr_disable(priv);
 365         mlx4_rss_deinit(priv);
 366 }
 367
 368 /**
 369  * DPDK callback to close the device.
 370  *
 371  * Destroy all queues and objects, free memory.
 372  *
 373  * @param dev
 374  *   Pointer to Ethernet device structure.
 375  */
 376 static void
 377 mlx4_dev_close(struct rte_eth_dev *dev)
 378 {
 379         struct mlx4_priv *priv = dev->data->dev_private;
 380         unsigned int i;
 381
 382         DEBUG("%p: closing device \"%s\"",
 383               (void *)dev,
 384               ((priv->ctx != NULL) ? priv->ctx->device->name : ""));
 385         dev->rx_pkt_burst = mlx4_rx_burst_removed;
 386         dev->tx_pkt_burst = mlx4_tx_burst_removed;
 387         rte_wmb();
 388         /* Disable datapath on secondary process. */
 389         mlx4_mp_req_stop_rxtx(dev);
 390         mlx4_flow_clean(priv);
 391         mlx4_rss_deinit(priv);
 392         for (i = 0; i != dev->data->nb_rx_queues; ++i)
 393                 mlx4_rx_queue_release(dev->data->rx_queues[i]);
 394         for (i = 0; i != dev->data->nb_tx_queues; ++i)
 395                 mlx4_tx_queue_release(dev->data->tx_queues[i]);
 396         mlx4_proc_priv_uninit(dev);
 397         mlx4_mr_release(dev);
 398         if (priv->pd != NULL) {
 399                 MLX4_ASSERT(priv->ctx != NULL);
 400                 claim_zero(mlx4_glue->dealloc_pd(priv->pd));
 401                 claim_zero(mlx4_glue->close_device(priv->ctx));
 402         } else
 403                 MLX4_ASSERT(priv->ctx == NULL);
 404         mlx4_intr_uninstall(priv);
 405         memset(priv, 0, sizeof(*priv));
 406 }
 407
 408 static const struct eth_dev_ops mlx4_dev_ops = {
 409         .dev_configure = mlx4_dev_configure,
 410         .dev_start = mlx4_dev_start,
 411         .dev_stop = mlx4_dev_stop,
 412         .dev_set_link_down = mlx4_dev_set_link_down,
 413         .dev_set_link_up = mlx4_dev_set_link_up,
 414         .dev_close = mlx4_dev_close,
 415         .link_update = mlx4_link_update,
 416         .promiscuous_enable = mlx4_promiscuous_enable,
 417         .promiscuous_disable = mlx4_promiscuous_disable,
 418         .allmulticast_enable = mlx4_allmulticast_enable,
 419         .allmulticast_disable = mlx4_allmulticast_disable,
 420         .mac_addr_remove = mlx4_mac_addr_remove,
 421         .mac_addr_add = mlx4_mac_addr_add,
 422         .mac_addr_set = mlx4_mac_addr_set,
 423         .set_mc_addr_list = mlx4_set_mc_addr_list,
 424         .stats_get = mlx4_stats_get,
 425         .stats_reset = mlx4_stats_reset,
 426         .fw_version_get = mlx4_fw_version_get,
 427         .dev_infos_get = mlx4_dev_infos_get,
 428         .dev_supported_ptypes_get = mlx4_dev_supported_ptypes_get,
 429         .vlan_filter_set = mlx4_vlan_filter_set,
 430         .rx_queue_setup = mlx4_rx_queue_setup,
 431         .tx_queue_setup = mlx4_tx_queue_setup,
 432         .rx_queue_release = mlx4_rx_queue_release,
 433         .tx_queue_release = mlx4_tx_queue_release,
 434         .flow_ctrl_get = mlx4_flow_ctrl_get,
 435         .flow_ctrl_set = mlx4_flow_ctrl_set,
 436         .mtu_set = mlx4_mtu_set,
 437         .filter_ctrl = mlx4_filter_ctrl,
 438         .rx_queue_intr_enable = mlx4_rx_intr_enable,
 439         .rx_queue_intr_disable = mlx4_rx_intr_disable,
 440         .is_removed = mlx4_is_removed,
 441 };
 442
 443 /* Available operations from secondary process. */
 444 static const struct eth_dev_ops mlx4_dev_sec_ops = {
 445         .stats_get = mlx4_stats_get,
 446         .stats_reset = mlx4_stats_reset,
 447         .fw_version_get = mlx4_fw_version_get,
 448         .dev_infos_get = mlx4_dev_infos_get,
 449 };
 450
 451 /**
 452  * Get PCI information from struct ibv_device.
 453  *
 454  * @param device
 455  *   Pointer to Ethernet device structure.
 456  * @param[out] pci_addr
 457  *   PCI bus address output buffer.
 458  *
 459  * @return
 460  *   0 on success, negative errno value otherwise and rte_errno is set.
 461  */
 462 static int
 463 mlx4_ibv_device_to_pci_addr(const struct ibv_device *device,
 464                             struct rte_pci_addr *pci_addr)
 465 {
 466         FILE *file;
 467         char line[32];
 468         MKSTR(path, "%s/device/uevent", device->ibdev_path);
 469
 470         file = fopen(path, "rb");
 471         if (file == NULL) {
 472                 rte_errno = errno;
 473                 return -rte_errno;
 474         }
 475         while (fgets(line, sizeof(line), file) == line) {
 476                 size_t len = strlen(line);
 477                 int ret;
 478
 479                 /* Truncate long lines. */
 480                 if (len == (sizeof(line) - 1))
 481                         while (line[(len - 1)] != '\n') {
 482                                 ret = fgetc(file);
 483                                 if (ret == EOF)
 484                                         break;
 485                                 line[(len - 1)] = ret;
 486                         }
 487                 /* Extract information. */
 488                 if (sscanf(line,
 489                            "PCI_SLOT_NAME="
 490                            "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n",
 491                            &pci_addr->domain,
 492                            &pci_addr->bus,
 493                            &pci_addr->devid,
 494                            &pci_addr->function) == 4) {
 495                         break;
 496                 }
 497         }
 498         fclose(file);
 499         return 0;
 500 }
 501
 502 /**
 503  * Verify and store value for device argument.
 504  *
 505  * @param[in] key
 506  *   Key argument to verify.
 507  * @param[in] val
 508  *   Value associated with key.
 509  * @param[in, out] conf
 510  *   Shared configuration data.
 511  *
 512  * @return
 513  *   0 on success, negative errno value otherwise and rte_errno is set.
 514  */
 515 static int
 516 mlx4_arg_parse(const char *key, const char *val, struct mlx4_conf *conf)
 517 {
 518         unsigned long tmp;
 519
 520         errno = 0;
 521         tmp = strtoul(val, NULL, 0);
 522         if (errno) {
 523                 rte_errno = errno;
 524                 WARN("%s: \"%s\" is not a valid integer", key, val);
 525                 return -rte_errno;
 526         }
 527         if (strcmp(MLX4_PMD_PORT_KVARG, key) == 0) {
 528                 uint32_t ports = rte_log2_u32(conf->ports.present + 1);
 529
 530                 if (tmp >= ports) {
 531                         ERROR("port index %lu outside range [0,%" PRIu32 ")",
 532                               tmp, ports);
 533                         return -EINVAL;
 534                 }
 535                 if (!(conf->ports.present & (1 << tmp))) {
 536                         rte_errno = EINVAL;
 537                         ERROR("invalid port index %lu", tmp);
 538                         return -rte_errno;
 539                 }
 540                 conf->ports.enabled |= 1 << tmp;
 541         } else if (strcmp(MLX4_MR_EXT_MEMSEG_EN_KVARG, key) == 0) {
 542                 conf->mr_ext_memseg_en = !!tmp;
 543         } else {
 544                 rte_errno = EINVAL;
 545                 WARN("%s: unknown parameter", key);
 546                 return -rte_errno;
 547         }
 548         return 0;
 549 }
 550
 551 /**
 552  * Parse device parameters.
 553  *
 554  * @param devargs
 555  *   Device arguments structure.
 556  *
 557  * @return
 558  *   0 on success, negative errno value otherwise and rte_errno is set.
 559  */
 560 static int
 561 mlx4_args(struct rte_devargs *devargs, struct mlx4_conf *conf)
 562 {
 563         struct rte_kvargs *kvlist;
 564         unsigned int arg_count;
 565         int ret = 0;
 566         int i;
 567
 568         if (devargs == NULL)
 569                 return 0;
 570         kvlist = rte_kvargs_parse(devargs->args, pmd_mlx4_init_params);
 571         if (kvlist == NULL) {
 572                 rte_errno = EINVAL;
 573                 ERROR("failed to parse kvargs");
 574                 return -rte_errno;
 575         }
 576         /* Process parameters. */
 577         for (i = 0; pmd_mlx4_init_params[i]; ++i) {
 578                 arg_count = rte_kvargs_count(kvlist, pmd_mlx4_init_params[i]);
 579                 while (arg_count-- > 0) {
 580                         ret = rte_kvargs_process(kvlist,
 581                                                  pmd_mlx4_init_params[i],
 582                                                  (int (*)(const char *,
 583                                                           const char *,
 584                                                           void *))
 585                                                  mlx4_arg_parse,
 586                                                  conf);
 587                         if (ret != 0)
 588                                 goto free_kvlist;
 589                 }
 590         }
 591 free_kvlist:
 592         rte_kvargs_free(kvlist);
 593         return ret;
 594 }
 595
 596 /**
 597  * Interpret RSS capabilities reported by device.
 598  *
 599  * This function returns the set of usable Verbs RSS hash fields, kernel
 600  * quirks taken into account.
 601  *
 602  * @param ctx
 603  *   Verbs context.
 604  * @param pd
 605  *   Verbs protection domain.
 606  * @param device_attr_ex
 607  *   Extended device attributes to interpret.
 608  *
 609  * @return
 610  *   Usable RSS hash fields mask in Verbs format.
 611  */
 612 static uint64_t
 613 mlx4_hw_rss_sup(struct ibv_context *ctx, struct ibv_pd *pd,
 614                 struct ibv_device_attr_ex *device_attr_ex)
 615 {
 616         uint64_t hw_rss_sup = device_attr_ex->rss_caps.rx_hash_fields_mask;
 617         struct ibv_cq *cq = NULL;
 618         struct ibv_wq *wq = NULL;
 619         struct ibv_rwq_ind_table *ind = NULL;
 620         struct ibv_qp *qp = NULL;
 621
 622         if (!hw_rss_sup) {
 623                 WARN("no RSS capabilities reported; disabling support for UDP"
 624                      " RSS and inner VXLAN RSS");
 625                 return IBV_RX_HASH_SRC_IPV4 | IBV_RX_HASH_DST_IPV4 |
 626                         IBV_RX_HASH_SRC_IPV6 | IBV_RX_HASH_DST_IPV6 |
 627                         IBV_RX_HASH_SRC_PORT_TCP | IBV_RX_HASH_DST_PORT_TCP;
 628         }
 629         if (!(hw_rss_sup & IBV_RX_HASH_INNER))
 630                 return hw_rss_sup;
 631         /*
 632          * Although reported as supported, missing code in some Linux
 633          * versions (v4.15, v4.16) prevents the creation of hash QPs with
 634          * inner capability.
 635          *
 636          * There is no choice but to attempt to instantiate a temporary RSS
 637          * context in order to confirm its support.
 638          */
 639         cq = mlx4_glue->create_cq(ctx, 1, NULL, NULL, 0);
 640         wq = cq ? mlx4_glue->create_wq
 641                 (ctx,
 642                  &(struct ibv_wq_init_attr){
 643                         .wq_type = IBV_WQT_RQ,
 644                         .max_wr = 1,
 645                         .max_sge = 1,
 646                         .pd = pd,
 647                         .cq = cq,
 648                  }) : NULL;
 649         ind = wq ? mlx4_glue->create_rwq_ind_table
 650                 (ctx,
 651                  &(struct ibv_rwq_ind_table_init_attr){
 652                         .log_ind_tbl_size = 0,
 653                         .ind_tbl = &wq,
 654                         .comp_mask = 0,
 655                  }) : NULL;
 656         qp = ind ? mlx4_glue->create_qp_ex
 657                 (ctx,
 658                  &(struct ibv_qp_init_attr_ex){
 659                         .comp_mask =
 660                                 (IBV_QP_INIT_ATTR_PD |
 661                                  IBV_QP_INIT_ATTR_RX_HASH |
 662                                  IBV_QP_INIT_ATTR_IND_TABLE),
 663                         .qp_type = IBV_QPT_RAW_PACKET,
 664                         .pd = pd,
 665                         .rwq_ind_tbl = ind,
 666                         .rx_hash_conf = {
 667                                 .rx_hash_function = IBV_RX_HASH_FUNC_TOEPLITZ,
 668                                 .rx_hash_key_len = MLX4_RSS_HASH_KEY_SIZE,
 669                                 .rx_hash_key = mlx4_rss_hash_key_default,
 670                                 .rx_hash_fields_mask = hw_rss_sup,
 671                         },
 672                  }) : NULL;
 673         if (!qp) {
 674                 WARN("disabling unusable inner RSS capability due to kernel"
 675                      " quirk");
 676                 hw_rss_sup &= ~IBV_RX_HASH_INNER;
 677         } else {
 678                 claim_zero(mlx4_glue->destroy_qp(qp));
 679         }
 680         if (ind)
 681                 claim_zero(mlx4_glue->destroy_rwq_ind_table(ind));
 682         if (wq)
 683                 claim_zero(mlx4_glue->destroy_wq(wq));
 684         if (cq)
 685                 claim_zero(mlx4_glue->destroy_cq(cq));
 686         return hw_rss_sup;
 687 }
 688
 689 static struct rte_pci_driver mlx4_driver;
 690
 691 /**
 692  * PMD global initialization.
 693  *
 694  * Independent from individual device, this function initializes global
 695  * per-PMD data structures distinguishing primary and secondary processes.
 696  * Hence, each initialization is called once per a process.
 697  *
 698  * @return
 699  *   0 on success, a negative errno value otherwise and rte_errno is set.
 700  */
 701 static int
 702 mlx4_init_once(void)
 703 {
 704         struct mlx4_shared_data *sd;
 705         struct mlx4_local_data *ld = &mlx4_local_data;
 706         int ret = 0;
 707
 708         if (mlx4_init_shared_data())
 709                 return -rte_errno;
 710         sd = mlx4_shared_data;
 711         MLX4_ASSERT(sd);
 712         rte_spinlock_lock(&sd->lock);
 713         switch (rte_eal_process_type()) {
 714         case RTE_PROC_PRIMARY:
 715                 if (sd->init_done)
 716                         break;
 717                 LIST_INIT(&sd->mem_event_cb_list);
 718                 rte_rwlock_init(&sd->mem_event_rwlock);
 719                 rte_mem_event_callback_register("MLX4_MEM_EVENT_CB",
 720                                                 mlx4_mr_mem_event_cb, NULL);
 721                 ret = mlx4_mp_init_primary();
 722                 if (ret)
 723                         goto out;
 724                 sd->init_done = 1;
 725                 break;
 726         case RTE_PROC_SECONDARY:
 727                 if (ld->init_done)
 728                         break;
 729                 ret = mlx4_mp_init_secondary();
 730                 if (ret)
 731                         goto out;
 732                 ++sd->secondary_cnt;
 733                 ld->init_done = 1;
 734                 break;
 735         default:
 736                 break;
 737         }
 738 out:
 739         rte_spinlock_unlock(&sd->lock);
 740         return ret;
 741 }
 742
 743 /**
 744  * DPDK callback to register a PCI device.
 745  *
 746  * This function creates an Ethernet device for each port of a given
 747  * PCI device.
 748  *
 749  * @param[in] pci_drv
 750  *   PCI driver structure (mlx4_driver).
 751  * @param[in] pci_dev
 752  *   PCI device information.
 753  *
 754  * @return
 755  *   0 on success, negative errno value otherwise and rte_errno is set.
 756  */
 757 static int
 758 mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 759 {
 760         struct ibv_device **list;
 761         struct ibv_device *ibv_dev;
 762         int err = 0;
 763         struct ibv_context *attr_ctx = NULL;
 764         struct ibv_device_attr device_attr;
 765         struct ibv_device_attr_ex device_attr_ex;
 766         struct mlx4_conf conf = {
 767                 .ports.present = 0,
 768                 .mr_ext_memseg_en = 1,
 769         };
 770         unsigned int vf;
 771         int i;
 772         char ifname[IF_NAMESIZE];
 773
 774         (void)pci_drv;
 775         err = mlx4_init_once();
 776         if (err) {
 777                 ERROR("unable to init PMD global data: %s",
 778                       strerror(rte_errno));
 779                 return -rte_errno;
 780         }
 781         MLX4_ASSERT(pci_drv == &mlx4_driver);
 782         list = mlx4_glue->get_device_list(&i);
 783         if (list == NULL) {
 784                 rte_errno = errno;
 785                 MLX4_ASSERT(rte_errno);
 786                 if (rte_errno == ENOSYS)
 787                         ERROR("cannot list devices, is ib_uverbs loaded?");
 788                 return -rte_errno;
 789         }
 790         MLX4_ASSERT(i >= 0);
 791         /*
 792          * For each listed device, check related sysfs entry against
 793          * the provided PCI ID.
 794          */
 795         while (i != 0) {
 796                 struct rte_pci_addr pci_addr;
 797
 798                 --i;
 799                 DEBUG("checking device \"%s\"", list[i]->name);
 800                 if (mlx4_ibv_device_to_pci_addr(list[i], &pci_addr))
 801                         continue;
 802                 if ((pci_dev->addr.domain != pci_addr.domain) ||
 803                     (pci_dev->addr.bus != pci_addr.bus) ||
 804                     (pci_dev->addr.devid != pci_addr.devid) ||
 805                     (pci_dev->addr.function != pci_addr.function))
 806                         continue;
 807                 vf = (pci_dev->id.device_id ==
 808                       PCI_DEVICE_ID_MELLANOX_CONNECTX3VF);
 809                 INFO("PCI information matches, using device \"%s\" (VF: %s)",
 810                      list[i]->name, (vf ? "true" : "false"));
 811                 attr_ctx = mlx4_glue->open_device(list[i]);
 812                 err = errno;
 813                 break;
 814         }
 815         if (attr_ctx == NULL) {
 816                 mlx4_glue->free_device_list(list);
 817                 switch (err) {
 818                 case 0:
 819                         rte_errno = ENODEV;
 820                         ERROR("cannot access device, is mlx4_ib loaded?");
 821                         return -rte_errno;
 822                 case EINVAL:
 823                         rte_errno = EINVAL;
 824                         ERROR("cannot use device, are drivers up to date?");
 825                         return -rte_errno;
 826                 }
 827                 MLX4_ASSERT(err > 0);
 828                 rte_errno = err;
 829                 return -rte_errno;
 830         }
 831         ibv_dev = list[i];
 832         DEBUG("device opened");
 833         if (mlx4_glue->query_device(attr_ctx, &device_attr)) {
 834                 err = ENODEV;
 835                 goto error;
 836         }
 837         INFO("%u port(s) detected", device_attr.phys_port_cnt);
 838         conf.ports.present |= (UINT64_C(1) << device_attr.phys_port_cnt) - 1;
 839         if (mlx4_args(pci_dev->device.devargs, &conf)) {
 840                 ERROR("failed to process device arguments");
 841                 err = EINVAL;
 842                 goto error;
 843         }
 844         /* Use all ports when none are defined */
 845         if (!conf.ports.enabled)
 846                 conf.ports.enabled = conf.ports.present;
 847         /* Retrieve extended device attributes. */
 848         if (mlx4_glue->query_device_ex(attr_ctx, NULL, &device_attr_ex)) {
 849                 err = ENODEV;
 850                 goto error;
 851         }
 852         MLX4_ASSERT(device_attr.max_sge >= MLX4_MAX_SGE);
 853         for (i = 0; i < device_attr.phys_port_cnt; i++) {
 854                 uint32_t port = i + 1; /* ports are indexed from one */
 855                 struct ibv_context *ctx = NULL;
 856                 struct ibv_port_attr port_attr;
 857                 struct ibv_pd *pd = NULL;
 858                 struct mlx4_priv *priv = NULL;
 859                 struct rte_eth_dev *eth_dev = NULL;
 860                 struct rte_ether_addr mac;
 861                 char name[RTE_ETH_NAME_MAX_LEN];
 862
 863                 /* If port is not enabled, skip. */
 864                 if (!(conf.ports.enabled & (1 << i)))
 865                         continue;
 866                 DEBUG("using port %u", port);
 867                 ctx = mlx4_glue->open_device(ibv_dev);
 868                 if (ctx == NULL) {
 869                         err = ENODEV;
 870                         goto port_error;
 871                 }
 872                 snprintf(name, sizeof(name), "%s port %u",
 873                          mlx4_glue->get_device_name(ibv_dev), port);
 874                 if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
 875                         eth_dev = rte_eth_dev_attach_secondary(name);
 876                         if (eth_dev == NULL) {
 877                                 ERROR("can not attach rte ethdev");
 878                                 rte_errno = ENOMEM;
 879                                 err = rte_errno;
 880                                 goto error;
 881                         }
 882                         priv = eth_dev->data->dev_private;
 883                         if (!priv->verbs_alloc_ctx.enabled) {
 884                                 ERROR("secondary process is not supported"
 885                                       " due to lack of external allocator"
 886                                       " from Verbs");
 887                                 rte_errno = ENOTSUP;
 888                                 err = rte_errno;
 889                                 goto error;
 890                         }
 891                         eth_dev->device = &pci_dev->device;
 892                         eth_dev->dev_ops = &mlx4_dev_sec_ops;
 893                         err = mlx4_proc_priv_init(eth_dev);
 894                         if (err)
 895                                 goto error;
 896                         /* Receive command fd from primary process. */
 897                         err = mlx4_mp_req_verbs_cmd_fd(eth_dev);
 898                         if (err < 0) {
 899                                 err = rte_errno;
 900                                 goto error;
 901                         }
 902                         /* Remap UAR for Tx queues. */
 903                         err = mlx4_tx_uar_init_secondary(eth_dev, err);
 904                         if (err) {
 905                                 err = rte_errno;
 906                                 goto error;
 907                         }
 908                         /*
 909                          * Ethdev pointer is still required as input since
 910                          * the primary device is not accessible from the
 911                          * secondary process.
 912                          */
 913                         eth_dev->tx_pkt_burst = mlx4_tx_burst;
 914                         eth_dev->rx_pkt_burst = mlx4_rx_burst;
 915                         claim_zero(mlx4_glue->close_device(ctx));
 916                         rte_eth_copy_pci_info(eth_dev, pci_dev);
 917                         rte_eth_dev_probing_finish(eth_dev);
 918                         continue;
 919                 }
 920                 /* Check port status. */
 921                 err = mlx4_glue->query_port(ctx, port, &port_attr);
 922                 if (err) {
 923                         err = ENODEV;
 924                         ERROR("port query failed: %s", strerror(err));
 925                         goto port_error;
 926                 }
 927                 if (port_attr.link_layer != IBV_LINK_LAYER_ETHERNET) {
 928                         err = ENOTSUP;
 929                         ERROR("port %d is not configured in Ethernet mode",
 930                               port);
 931                         goto port_error;
 932                 }
 933                 if (port_attr.state != IBV_PORT_ACTIVE)
 934                         DEBUG("port %d is not active: \"%s\" (%d)",
 935                               port, mlx4_glue->port_state_str(port_attr.state),
 936                               port_attr.state);
 937                 /* Make asynchronous FD non-blocking to handle interrupts. */
 938                 err = mlx4_fd_set_non_blocking(ctx->async_fd);
 939                 if (err) {
 940                         ERROR("cannot make asynchronous FD non-blocking: %s",
 941                               strerror(err));
 942                         goto port_error;
 943                 }
 944                 /* Allocate protection domain. */
 945                 pd = mlx4_glue->alloc_pd(ctx);
 946                 if (pd == NULL) {
 947                         err = ENOMEM;
 948                         ERROR("PD allocation failure");
 949                         goto port_error;
 950                 }
 951                 /* from rte_ethdev.c */
 952                 priv = rte_zmalloc("ethdev private structure",
 953                                    sizeof(*priv),
 954                                    RTE_CACHE_LINE_SIZE);
 955                 if (priv == NULL) {
 956                         err = ENOMEM;
 957                         ERROR("priv allocation failure");
 958                         goto port_error;
 959                 }
 960                 priv->ctx = ctx;
 961                 priv->device_attr = device_attr;
 962                 priv->port = port;
 963                 priv->pd = pd;
 964                 priv->mtu = RTE_ETHER_MTU;
 965                 priv->vf = vf;
 966                 priv->hw_csum = !!(device_attr.device_cap_flags &
 967                                    IBV_DEVICE_RAW_IP_CSUM);
 968                 DEBUG("checksum offloading is %ssupported",
 969                       (priv->hw_csum ? "" : "not "));
 970                 /* Only ConnectX-3 Pro supports tunneling. */
 971                 priv->hw_csum_l2tun =
 972                         priv->hw_csum &&
 973                         (device_attr.vendor_part_id ==
 974                          PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO);
 975                 DEBUG("L2 tunnel checksum offloads are %ssupported",
 976                       priv->hw_csum_l2tun ? "" : "not ");
 977                 priv->hw_rss_sup = mlx4_hw_rss_sup(priv->ctx, priv->pd,
 978                                                    &device_attr_ex);
 979                 DEBUG("supported RSS hash fields mask: %016" PRIx64,
 980                       priv->hw_rss_sup);
 981                 priv->hw_rss_max_qps =
 982                         device_attr_ex.rss_caps.max_rwq_indirection_table_size;
 983                 DEBUG("MAX RSS queues %d", priv->hw_rss_max_qps);
 984                 priv->hw_fcs_strip = !!(device_attr_ex.raw_packet_caps &
 985                                         IBV_RAW_PACKET_CAP_SCATTER_FCS);
 986                 DEBUG("FCS stripping toggling is %ssupported",
 987                       priv->hw_fcs_strip ? "" : "not ");
 988                 priv->tso =
 989                         ((device_attr_ex.tso_caps.max_tso > 0) &&
 990                          (device_attr_ex.tso_caps.supported_qpts &
 991                           (1 << IBV_QPT_RAW_PACKET)));
 992                 if (priv->tso)
 993                         priv->tso_max_payload_sz =
 994                                         device_attr_ex.tso_caps.max_tso;
 995                 DEBUG("TSO is %ssupported",
 996                       priv->tso ? "" : "not ");
 997                 priv->mr_ext_memseg_en = conf.mr_ext_memseg_en;
 998                 /* Configure the first MAC address by default. */
 999                 err = mlx4_get_mac(priv, &mac.addr_bytes);
1000                 if (err) {
1001                         ERROR("cannot get MAC address, is mlx4_en loaded?"
1002                               " (error: %s)", strerror(err));
1003                         goto port_error;
1004                 }
1005                 INFO("port %u MAC address is %02x:%02x:%02x:%02x:%02x:%02x",
1006                      priv->port,
1007                      mac.addr_bytes[0], mac.addr_bytes[1],
1008                      mac.addr_bytes[2], mac.addr_bytes[3],
1009                      mac.addr_bytes[4], mac.addr_bytes[5]);
1010                 /* Register MAC address. */
1011                 priv->mac[0] = mac;
1012
1013                 if (mlx4_get_ifname(priv, &ifname) == 0) {
1014                         DEBUG("port %u ifname is \"%s\"",
1015                               priv->port, ifname);
1016                         priv->if_index = if_nametoindex(ifname);
1017                 } else {
1018                         DEBUG("port %u ifname is unknown", priv->port);
1019                 }
1020
1021                 /* Get actual MTU if possible. */
1022                 mlx4_mtu_get(priv, &priv->mtu);
1023                 DEBUG("port %u MTU is %u", priv->port, priv->mtu);
1024                 eth_dev = rte_eth_dev_allocate(name);
1025                 if (eth_dev == NULL) {
1026                         err = ENOMEM;
1027                         ERROR("can not allocate rte ethdev");
1028                         goto port_error;
1029                 }
1030                 eth_dev->data->dev_private = priv;
1031                 eth_dev->data->mac_addrs = priv->mac;
1032                 eth_dev->device = &pci_dev->device;
1033                 rte_eth_copy_pci_info(eth_dev, pci_dev);
1034                 /* Initialize local interrupt handle for current port. */
1035                 priv->intr_handle = (struct rte_intr_handle){
1036                         .fd = -1,
1037                         .type = RTE_INTR_HANDLE_EXT,
1038                 };
1039                 /*
1040                  * Override ethdev interrupt handle pointer with private
1041                  * handle instead of that of the parent PCI device used by
1042                  * default. This prevents it from being shared between all
1043                  * ports of the same PCI device since each of them is
1044                  * associated its own Verbs context.
1045                  *
1046                  * Rx interrupts in particular require this as the PMD has
1047                  * no control over the registration of queue interrupts
1048                  * besides setting up eth_dev->intr_handle, the rest is
1049                  * handled by rte_intr_rx_ctl().
1050                  */
1051                 eth_dev->intr_handle = &priv->intr_handle;
1052                 priv->dev_data = eth_dev->data;
1053                 eth_dev->dev_ops = &mlx4_dev_ops;
1054 #ifdef HAVE_IBV_MLX4_BUF_ALLOCATORS
1055                 /* Hint libmlx4 to use PMD allocator for data plane resources */
1056                 err = mlx4_glue->dv_set_context_attr
1057                         (ctx, MLX4DV_SET_CTX_ATTR_BUF_ALLOCATORS,
1058                          (void *)((uintptr_t)&(struct mlx4dv_ctx_allocators){
1059                                  .alloc = &mlx4_alloc_verbs_buf,
1060                                  .free = &mlx4_free_verbs_buf,
1061                                  .data = priv,
1062                         }));
1063                 if (err)
1064                         WARN("Verbs external allocator is not supported");
1065                 else
1066                         priv->verbs_alloc_ctx.enabled = 1;
1067 #endif
1068                 /* Bring Ethernet device up. */
1069                 DEBUG("forcing Ethernet interface up");
1070                 mlx4_dev_set_link_up(eth_dev);
1071                 /* Update link status once if waiting for LSC. */
1072                 if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
1073                         mlx4_link_update(eth_dev, 0);
1074                 /*
1075                  * Once the device is added to the list of memory event
1076                  * callback, its global MR cache table cannot be expanded
1077                  * on the fly because of deadlock. If it overflows, lookup
1078                  * should be done by searching MR list linearly, which is slow.
1079                  */
1080                 err = mlx4_mr_btree_init(&priv->mr.cache,
1081                                          MLX4_MR_BTREE_CACHE_N * 2,
1082                                          eth_dev->device->numa_node);
1083                 if (err) {
1084                         /* rte_errno is already set. */
1085                         goto port_error;
1086                 }
1087                 /* Add device to memory callback list. */
1088                 rte_rwlock_write_lock(&mlx4_shared_data->mem_event_rwlock);
1089                 LIST_INSERT_HEAD(&mlx4_shared_data->mem_event_cb_list,
1090                                  priv, mem_event_cb);
1091                 rte_rwlock_write_unlock(&mlx4_shared_data->mem_event_rwlock);
1092                 rte_eth_dev_probing_finish(eth_dev);
1093                 continue;
1094 port_error:
1095                 rte_free(priv);
1096                 if (eth_dev != NULL)
1097                         eth_dev->data->dev_private = NULL;
1098                 if (pd)
1099                         claim_zero(mlx4_glue->dealloc_pd(pd));
1100                 if (ctx)
1101                         claim_zero(mlx4_glue->close_device(ctx));
1102                 if (eth_dev != NULL) {
1103                         /* mac_addrs must not be freed because part of dev_private */
1104                         eth_dev->data->mac_addrs = NULL;
1105                         rte_eth_dev_release_port(eth_dev);
1106                 }
1107                 break;
1108         }
1109         /*
1110          * XXX if something went wrong in the loop above, there is a resource
1111          * leak (ctx, pd, priv, dpdk ethdev) but we can do nothing about it as
1112          * long as the dpdk does not provide a way to deallocate a ethdev and a
1113          * way to enumerate the registered ethdevs to free the previous ones.
1114          */
1115 error:
1116         if (attr_ctx)
1117                 claim_zero(mlx4_glue->close_device(attr_ctx));
1118         if (list)
1119                 mlx4_glue->free_device_list(list);
1120         if (err)
1121                 rte_errno = err;
1122         return -err;
1123 }
1124
1125 static const struct rte_pci_id mlx4_pci_id_map[] = {
1126         {
1127                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1128                                PCI_DEVICE_ID_MELLANOX_CONNECTX3)
1129         },
1130         {
1131                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1132                                PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO)
1133         },
1134         {
1135                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1136                                PCI_DEVICE_ID_MELLANOX_CONNECTX3VF)
1137         },
1138         {
1139                 .vendor_id = 0
1140         }
1141 };
1142
1143 static struct rte_pci_driver mlx4_driver = {
1144         .driver = {
1145                 .name = MLX4_DRIVER_NAME
1146         },
1147         .id_table = mlx4_pci_id_map,
1148         .probe = mlx4_pci_probe,
1149         .drv_flags = RTE_PCI_DRV_INTR_LSC | RTE_PCI_DRV_INTR_RMV,
1150 };
1151
1152 #ifdef RTE_IBVERBS_LINK_DLOPEN
1153
1154 /**
1155  * Suffix RTE_EAL_PMD_PATH with "-glue".
1156  *
1157  * This function performs a sanity check on RTE_EAL_PMD_PATH before
1158  * suffixing its last component.
1159  *
1160  * @param buf[out]
1161  *   Output buffer, should be large enough otherwise NULL is returned.
1162  * @param size
1163  *   Size of @p out.
1164  *
1165  * @return
1166  *   Pointer to @p buf or @p NULL in case suffix cannot be appended.
1167  */
1168 static char *
1169 mlx4_glue_path(char *buf, size_t size)
1170 {
1171         static const char *const bad[] = { "/", ".", "..", NULL };
1172         const char *path = RTE_EAL_PMD_PATH;
1173         size_t len = strlen(path);
1174         size_t off;
1175         int i;
1176
1177         while (len && path[len - 1] == '/')
1178                 --len;
1179         for (off = len; off && path[off - 1] != '/'; --off)
1180                 ;
1181         for (i = 0; bad[i]; ++i)
1182                 if (!strncmp(path + off, bad[i], (int)(len - off)))
1183                         goto error;
1184         i = snprintf(buf, size, "%.*s-glue", (int)len, path);
1185         if (i == -1 || (size_t)i >= size)
1186                 goto error;
1187         return buf;
1188 error:
1189         ERROR("unable to append \"-glue\" to last component of"
1190               " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"),"
1191               " please re-configure DPDK");
1192         return NULL;
1193 }
1194
1195 /**
1196  * Initialization routine for run-time dependency on rdma-core.
1197  */
1198 static int
1199 mlx4_glue_init(void)
1200 {
1201         char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
1202         const char *path[] = {
1203                 /*
1204                  * A basic security check is necessary before trusting
1205                  * MLX4_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
1206                  */
1207                 (geteuid() == getuid() && getegid() == getgid() ?
1208                  getenv("MLX4_GLUE_PATH") : NULL),
1209                 /*
1210                  * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
1211                  * variant, otherwise let dlopen() look up libraries on its
1212                  * own.
1213                  */
1214                 (*RTE_EAL_PMD_PATH ?
1215                  mlx4_glue_path(glue_path, sizeof(glue_path)) : ""),
1216         };
1217         unsigned int i = 0;
1218         void *handle = NULL;
1219         void **sym;
1220         const char *dlmsg;
1221
1222         while (!handle && i != RTE_DIM(path)) {
1223                 const char *end;
1224                 size_t len;
1225                 int ret;
1226
1227                 if (!path[i]) {
1228                         ++i;
1229                         continue;
1230                 }
1231                 end = strpbrk(path[i], ":;");
1232                 if (!end)
1233                         end = path[i] + strlen(path[i]);
1234                 len = end - path[i];
1235                 ret = 0;
1236                 do {
1237                         char name[ret + 1];
1238
1239                         ret = snprintf(name, sizeof(name), "%.*s%s" MLX4_GLUE,
1240                                        (int)len, path[i],
1241                                        (!len || *(end - 1) == '/') ? "" : "/");
1242                         if (ret == -1)
1243                                 break;
1244                         if (sizeof(name) != (size_t)ret + 1)
1245                                 continue;
1246                         DEBUG("looking for rdma-core glue as \"%s\"", name);
1247                         handle = dlopen(name, RTLD_LAZY);
1248                         break;
1249                 } while (1);
1250                 path[i] = end + 1;
1251                 if (!*end)
1252                         ++i;
1253         }
1254         if (!handle) {
1255                 rte_errno = EINVAL;
1256                 dlmsg = dlerror();
1257                 if (dlmsg)
1258                         WARN("cannot load glue library: %s", dlmsg);
1259                 goto glue_error;
1260         }
1261         sym = dlsym(handle, "mlx4_glue");
1262         if (!sym || !*sym) {
1263                 rte_errno = EINVAL;
1264                 dlmsg = dlerror();
1265                 if (dlmsg)
1266                         ERROR("cannot resolve glue symbol: %s", dlmsg);
1267                 goto glue_error;
1268         }
1269         mlx4_glue = *sym;
1270         return 0;
1271 glue_error:
1272         if (handle)
1273                 dlclose(handle);
1274         WARN("cannot initialize PMD due to missing run-time"
1275              " dependency on rdma-core libraries (libibverbs,"
1276              " libmlx4)");
1277         return -rte_errno;
1278 }
1279
1280 #endif
1281
1282 /**
1283  * Driver initialization routine.
1284  */
1285 RTE_INIT(rte_mlx4_pmd_init)
1286 {
1287         /* Initialize driver log type. */
1288         mlx4_logtype = rte_log_register("pmd.net.mlx4");
1289         if (mlx4_logtype >= 0)
1290                 rte_log_set_level(mlx4_logtype, RTE_LOG_NOTICE);
1291
1292         /*
1293          * MLX4_DEVICE_FATAL_CLEANUP tells ibv_destroy functions we
1294          * want to get success errno value in case of calling them
1295          * when the device was removed.
1296          */
1297         setenv("MLX4_DEVICE_FATAL_CLEANUP", "1", 1);
1298         /*
1299          * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
1300          * huge pages. Calling ibv_fork_init() during init allows
1301          * applications to use fork() safely for purposes other than
1302          * using this PMD, which is not supported in forked processes.
1303          */
1304         setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
1305 #ifdef RTE_IBVERBS_LINK_DLOPEN
1306         if (mlx4_glue_init())
1307                 return;
1308         MLX4_ASSERT(mlx4_glue);
1309 #endif
1310 #ifdef RTE_LIBRTE_MLX4_DEBUG
1311         /* Glue structure must not contain any NULL pointers. */
1312         {
1313                 unsigned int i;
1314
1315                 for (i = 0; i != sizeof(*mlx4_glue) / sizeof(void *); ++i)
1316                         MLX4_ASSERT(((const void *const *)mlx4_glue)[i]);
1317         }
1318 #endif
1319         if (strcmp(mlx4_glue->version, MLX4_GLUE_VERSION)) {
1320                 ERROR("rdma-core glue \"%s\" mismatch: \"%s\" is required",
1321                       mlx4_glue->version, MLX4_GLUE_VERSION);
1322                 return;
1323         }
1324         mlx4_glue->fork_init();
1325         rte_pci_register(&mlx4_driver);
1326 }
1327
1328 RTE_PMD_EXPORT_NAME(net_mlx4, __COUNTER__);
1329 RTE_PMD_REGISTER_PCI_TABLE(net_mlx4, mlx4_pci_id_map);
1330 RTE_PMD_REGISTER_KMOD_DEP(net_mlx4,
1331         "* ib_uverbs & mlx4_en & mlx4_core & mlx4_ib");