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 <ethdev_driver.h>
  37 #include <ethdev_pci.h>
  38 #include <rte_ether.h>
  39 #include <rte_flow.h>
  40 #include <rte_interrupts.h>
  41 #include <rte_kvargs.h>
  42 #include <rte_malloc.h>
  43 #include <rte_mbuf.h>
  44
  45 #include "mlx4.h"
  46 #include "mlx4_glue.h"
  47 #include "mlx4_flow.h"
  48 #include "mlx4_mr.h"
  49 #include "mlx4_rxtx.h"
  50 #include "mlx4_utils.h"
  51
  52 #ifdef MLX4_GLUE
  53 const struct mlx4_glue *mlx4_glue;
  54 #endif
  55
  56 static const char *MZ_MLX4_PMD_SHARED_DATA = "mlx4_pmd_shared_data";
  57
  58 /* Shared memory between primary and secondary processes. */
  59 struct mlx4_shared_data *mlx4_shared_data;
  60
  61 /* Spinlock for mlx4_shared_data allocation. */
  62 static rte_spinlock_t mlx4_shared_data_lock = RTE_SPINLOCK_INITIALIZER;
  63
  64 /* Process local data for secondary processes. */
  65 static struct mlx4_local_data mlx4_local_data;
  66
  67 /** Configuration structure for device arguments. */
  68 struct mlx4_conf {
  69         struct {
  70                 uint32_t present; /**< Bit-field for existing ports. */
  71                 uint32_t enabled; /**< Bit-field for user-enabled ports. */
  72         } ports;
  73         int mr_ext_memseg_en;
  74         /** Whether memseg should be extended for MR creation. */
  75 };
  76
  77 /* Available parameters list. */
  78 const char *pmd_mlx4_init_params[] = {
  79         MLX4_PMD_PORT_KVARG,
  80         MLX4_MR_EXT_MEMSEG_EN_KVARG,
  81         NULL,
  82 };
  83
  84 static int mlx4_dev_stop(struct rte_eth_dev *dev);
  85
  86 /**
  87  * Initialize shared data between primary and secondary process.
  88  *
  89  * A memzone is reserved by primary process and secondary processes attach to
  90  * the memzone.
  91  *
  92  * @return
  93  *   0 on success, a negative errno value otherwise and rte_errno is set.
  94  */
  95 static int
  96 mlx4_init_shared_data(void)
  97 {
  98         const struct rte_memzone *mz;
  99         int ret = 0;
 100
 101         rte_spinlock_lock(&mlx4_shared_data_lock);
 102         if (mlx4_shared_data == NULL) {
 103                 if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
 104                         /* Allocate shared memory. */
 105                         mz = rte_memzone_reserve(MZ_MLX4_PMD_SHARED_DATA,
 106                                                  sizeof(*mlx4_shared_data),
 107                                                  SOCKET_ID_ANY, 0);
 108                         if (mz == NULL) {
 109                                 ERROR("Cannot allocate mlx4 shared data\n");
 110                                 ret = -rte_errno;
 111                                 goto error;
 112                         }
 113                         mlx4_shared_data = mz->addr;
 114                         memset(mlx4_shared_data, 0, sizeof(*mlx4_shared_data));
 115                         rte_spinlock_init(&mlx4_shared_data->lock);
 116                 } else {
 117                         /* Lookup allocated shared memory. */
 118                         mz = rte_memzone_lookup(MZ_MLX4_PMD_SHARED_DATA);
 119                         if (mz == NULL) {
 120                                 ERROR("Cannot attach mlx4 shared data\n");
 121                                 ret = -rte_errno;
 122                                 goto error;
 123                         }
 124                         mlx4_shared_data = mz->addr;
 125                         memset(&mlx4_local_data, 0, sizeof(mlx4_local_data));
 126                 }
 127         }
 128 error:
 129         rte_spinlock_unlock(&mlx4_shared_data_lock);
 130         return ret;
 131 }
 132
 133 #ifdef HAVE_IBV_MLX4_BUF_ALLOCATORS
 134 /**
 135  * Verbs callback to allocate a memory. This function should allocate the space
 136  * according to the size provided residing inside a huge page.
 137  * Please note that all allocation must respect the alignment from libmlx4
 138  * (i.e. currently sysconf(_SC_PAGESIZE)).
 139  *
 140  * @param[in] size
 141  *   The size in bytes of the memory to allocate.
 142  * @param[in] data
 143  *   A pointer to the callback data.
 144  *
 145  * @return
 146  *   Allocated buffer, NULL otherwise and rte_errno is set.
 147  */
 148 static void *
 149 mlx4_alloc_verbs_buf(size_t size, void *data)
 150 {
 151         struct mlx4_priv *priv = data;
 152         void *ret;
 153         size_t alignment = sysconf(_SC_PAGESIZE);
 154         unsigned int socket = SOCKET_ID_ANY;
 155
 156         if (priv->verbs_alloc_ctx.type == MLX4_VERBS_ALLOC_TYPE_TX_QUEUE) {
 157                 const struct txq *txq = priv->verbs_alloc_ctx.obj;
 158
 159                 socket = txq->socket;
 160         } else if (priv->verbs_alloc_ctx.type ==
 161                    MLX4_VERBS_ALLOC_TYPE_RX_QUEUE) {
 162                 const struct rxq *rxq = priv->verbs_alloc_ctx.obj;
 163
 164                 socket = rxq->socket;
 165         }
 166         MLX4_ASSERT(data != NULL);
 167         ret = rte_malloc_socket(__func__, size, alignment, socket);
 168         if (!ret && size)
 169                 rte_errno = ENOMEM;
 170         return ret;
 171 }
 172
 173 /**
 174  * Verbs callback to free a memory.
 175  *
 176  * @param[in] ptr
 177  *   A pointer to the memory to free.
 178  * @param[in] data
 179  *   A pointer to the callback data.
 180  */
 181 static void
 182 mlx4_free_verbs_buf(void *ptr, void *data __rte_unused)
 183 {
 184         MLX4_ASSERT(data != NULL);
 185         rte_free(ptr);
 186 }
 187 #endif
 188
 189 /**
 190  * Initialize process private data structure.
 191  *
 192  * @param dev
 193  *   Pointer to Ethernet device structure.
 194  *
 195  * @return
 196  *   0 on success, a negative errno value otherwise and rte_errno is set.
 197  */
 198 int
 199 mlx4_proc_priv_init(struct rte_eth_dev *dev)
 200 {
 201         struct mlx4_proc_priv *ppriv;
 202         size_t ppriv_size;
 203
 204         /*
 205          * UAR register table follows the process private structure. BlueFlame
 206          * registers for Tx queues are stored in the table.
 207          */
 208         ppriv_size = sizeof(struct mlx4_proc_priv) +
 209                      dev->data->nb_tx_queues * sizeof(void *);
 210         ppriv = rte_zmalloc_socket("mlx4_proc_priv", ppriv_size,
 211                                    RTE_CACHE_LINE_SIZE, dev->device->numa_node);
 212         if (!ppriv) {
 213                 rte_errno = ENOMEM;
 214                 return -rte_errno;
 215         }
 216         ppriv->uar_table_sz = dev->data->nb_tx_queues;
 217         dev->process_private = ppriv;
 218         return 0;
 219 }
 220
 221 /**
 222  * Un-initialize process private data structure.
 223  *
 224  * @param dev
 225  *   Pointer to Ethernet device structure.
 226  */
 227 void
 228 mlx4_proc_priv_uninit(struct rte_eth_dev *dev)
 229 {
 230         if (!dev->process_private)
 231                 return;
 232         rte_free(dev->process_private);
 233         dev->process_private = NULL;
 234 }
 235
 236 /**
 237  * DPDK callback for Ethernet device configuration.
 238  *
 239  * @param dev
 240  *   Pointer to Ethernet device structure.
 241  *
 242  * @return
 243  *   0 on success, negative errno value otherwise and rte_errno is set.
 244  */
 245 static int
 246 mlx4_dev_configure(struct rte_eth_dev *dev)
 247 {
 248         struct mlx4_priv *priv = dev->data->dev_private;
 249         struct rte_flow_error error;
 250         int ret;
 251
 252         /* Prepare internal flow rules. */
 253         ret = mlx4_flow_sync(priv, &error);
 254         if (ret) {
 255                 ERROR("cannot set up internal flow rules (code %d, \"%s\"),"
 256                       " flow error type %d, cause %p, message: %s",
 257                       -ret, strerror(-ret), error.type, error.cause,
 258                       error.message ? error.message : "(unspecified)");
 259                 goto exit;
 260         }
 261         ret = mlx4_intr_install(priv);
 262         if (ret) {
 263                 ERROR("%p: interrupt handler installation failed",
 264                       (void *)dev);
 265                 goto exit;
 266         }
 267         ret = mlx4_proc_priv_init(dev);
 268         if (ret) {
 269                 ERROR("%p: process private data allocation failed",
 270                       (void *)dev);
 271                 goto exit;
 272         }
 273 exit:
 274         return ret;
 275 }
 276
 277 /**
 278  * DPDK callback to start the device.
 279  *
 280  * Simulate device start by initializing common RSS resources and attaching
 281  * all configured flows.
 282  *
 283  * @param dev
 284  *   Pointer to Ethernet device structure.
 285  *
 286  * @return
 287  *   0 on success, negative errno value otherwise and rte_errno is set.
 288  */
 289 static int
 290 mlx4_dev_start(struct rte_eth_dev *dev)
 291 {
 292         struct mlx4_priv *priv = dev->data->dev_private;
 293         struct rte_flow_error error;
 294         int ret;
 295
 296         if (priv->started)
 297                 return 0;
 298         DEBUG("%p: attaching configured flows to all RX queues", (void *)dev);
 299         priv->started = 1;
 300         ret = mlx4_rss_init(priv);
 301         if (ret) {
 302                 ERROR("%p: cannot initialize RSS resources: %s",
 303                       (void *)dev, strerror(-ret));
 304                 goto err;
 305         }
 306 #ifdef RTE_LIBRTE_MLX4_DEBUG
 307         mlx4_mr_dump_dev(dev);
 308 #endif
 309         ret = mlx4_rxq_intr_enable(priv);
 310         if (ret) {
 311                 ERROR("%p: interrupt handler installation failed",
 312                      (void *)dev);
 313                 goto err;
 314         }
 315         ret = mlx4_flow_sync(priv, &error);
 316         if (ret) {
 317                 ERROR("%p: cannot attach flow rules (code %d, \"%s\"),"
 318                       " flow error type %d, cause %p, message: %s",
 319                       (void *)dev,
 320                       -ret, strerror(-ret), error.type, error.cause,
 321                       error.message ? error.message : "(unspecified)");
 322                 goto err;
 323         }
 324         rte_wmb();
 325         dev->tx_pkt_burst = mlx4_tx_burst;
 326         dev->rx_pkt_burst = mlx4_rx_burst;
 327         /* Enable datapath on secondary process. */
 328         mlx4_mp_req_start_rxtx(dev);
 329         return 0;
 330 err:
 331         mlx4_dev_stop(dev);
 332         return ret;
 333 }
 334
 335 /**
 336  * DPDK callback to stop the device.
 337  *
 338  * Simulate device stop by detaching all configured flows.
 339  *
 340  * @param dev
 341  *   Pointer to Ethernet device structure.
 342  */
 343 static int
 344 mlx4_dev_stop(struct rte_eth_dev *dev)
 345 {
 346         struct mlx4_priv *priv = dev->data->dev_private;
 347
 348         if (!priv->started)
 349                 return 0;
 350         DEBUG("%p: detaching flows from all RX queues", (void *)dev);
 351         priv->started = 0;
 352         dev->tx_pkt_burst = mlx4_tx_burst_removed;
 353         dev->rx_pkt_burst = mlx4_rx_burst_removed;
 354         rte_wmb();
 355         /* Disable datapath on secondary process. */
 356         mlx4_mp_req_stop_rxtx(dev);
 357         mlx4_flow_sync(priv, NULL);
 358         mlx4_rxq_intr_disable(priv);
 359         mlx4_rss_deinit(priv);
 360
 361         return 0;
 362 }
 363
 364 /**
 365  * DPDK callback to close the device.
 366  *
 367  * Destroy all queues and objects, free memory.
 368  *
 369  * @param dev
 370  *   Pointer to Ethernet device structure.
 371  */
 372 static int
 373 mlx4_dev_close(struct rte_eth_dev *dev)
 374 {
 375         struct mlx4_priv *priv = dev->data->dev_private;
 376         unsigned int i;
 377
 378         if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
 379                 rte_eth_dev_release_port(dev);
 380                 return 0;
 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         /* mac_addrs must not be freed because part of dev_private */
 407         dev->data->mac_addrs = NULL;
 408         return 0;
 409 }
 410
 411 static const struct eth_dev_ops mlx4_dev_ops = {
 412         .dev_configure = mlx4_dev_configure,
 413         .dev_start = mlx4_dev_start,
 414         .dev_stop = mlx4_dev_stop,
 415         .dev_set_link_down = mlx4_dev_set_link_down,
 416         .dev_set_link_up = mlx4_dev_set_link_up,
 417         .dev_close = mlx4_dev_close,
 418         .link_update = mlx4_link_update,
 419         .promiscuous_enable = mlx4_promiscuous_enable,
 420         .promiscuous_disable = mlx4_promiscuous_disable,
 421         .allmulticast_enable = mlx4_allmulticast_enable,
 422         .allmulticast_disable = mlx4_allmulticast_disable,
 423         .mac_addr_remove = mlx4_mac_addr_remove,
 424         .mac_addr_add = mlx4_mac_addr_add,
 425         .mac_addr_set = mlx4_mac_addr_set,
 426         .set_mc_addr_list = mlx4_set_mc_addr_list,
 427         .stats_get = mlx4_stats_get,
 428         .stats_reset = mlx4_stats_reset,
 429         .fw_version_get = mlx4_fw_version_get,
 430         .dev_infos_get = mlx4_dev_infos_get,
 431         .dev_supported_ptypes_get = mlx4_dev_supported_ptypes_get,
 432         .vlan_filter_set = mlx4_vlan_filter_set,
 433         .rx_queue_setup = mlx4_rx_queue_setup,
 434         .tx_queue_setup = mlx4_tx_queue_setup,
 435         .rx_queue_release = mlx4_rx_queue_release,
 436         .tx_queue_release = mlx4_tx_queue_release,
 437         .flow_ctrl_get = mlx4_flow_ctrl_get,
 438         .flow_ctrl_set = mlx4_flow_ctrl_set,
 439         .mtu_set = mlx4_mtu_set,
 440         .flow_ops_get = mlx4_flow_ops_get,
 441         .rx_queue_intr_enable = mlx4_rx_intr_enable,
 442         .rx_queue_intr_disable = mlx4_rx_intr_disable,
 443         .is_removed = mlx4_is_removed,
 444 };
 445
 446 /* Available operations from secondary process. */
 447 static const struct eth_dev_ops mlx4_dev_sec_ops = {
 448         .stats_get = mlx4_stats_get,
 449         .stats_reset = mlx4_stats_reset,
 450         .fw_version_get = mlx4_fw_version_get,
 451         .dev_infos_get = mlx4_dev_infos_get,
 452 };
 453
 454 /**
 455  * Get PCI information from struct ibv_device.
 456  *
 457  * @param device
 458  *   Pointer to Ethernet device structure.
 459  * @param[out] pci_addr
 460  *   PCI bus address output buffer.
 461  *
 462  * @return
 463  *   0 on success, negative errno value otherwise and rte_errno is set.
 464  */
 465 static int
 466 mlx4_ibv_device_to_pci_addr(const struct ibv_device *device,
 467                             struct rte_pci_addr *pci_addr)
 468 {
 469         FILE *file;
 470         char line[32];
 471         MKSTR(path, "%s/device/uevent", device->ibdev_path);
 472
 473         file = fopen(path, "rb");
 474         if (file == NULL) {
 475                 rte_errno = errno;
 476                 return -rte_errno;
 477         }
 478         while (fgets(line, sizeof(line), file) == line) {
 479                 size_t len = strlen(line);
 480                 int ret;
 481
 482                 /* Truncate long lines. */
 483                 if (len == (sizeof(line) - 1))
 484                         while (line[(len - 1)] != '\n') {
 485                                 ret = fgetc(file);
 486                                 if (ret == EOF)
 487                                         break;
 488                                 line[(len - 1)] = ret;
 489                         }
 490                 /* Extract information. */
 491                 if (sscanf(line,
 492                            "PCI_SLOT_NAME="
 493                            "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n",
 494                            &pci_addr->domain,
 495                            &pci_addr->bus,
 496                            &pci_addr->devid,
 497                            &pci_addr->function) == 4) {
 498                         break;
 499                 }
 500         }
 501         fclose(file);
 502         return 0;
 503 }
 504
 505 /**
 506  * Verify and store value for device argument.
 507  *
 508  * @param[in] key
 509  *   Key argument to verify.
 510  * @param[in] val
 511  *   Value associated with key.
 512  * @param[in, out] conf
 513  *   Shared configuration data.
 514  *
 515  * @return
 516  *   0 on success, negative errno value otherwise and rte_errno is set.
 517  */
 518 static int
 519 mlx4_arg_parse(const char *key, const char *val, struct mlx4_conf *conf)
 520 {
 521         unsigned long tmp;
 522
 523         errno = 0;
 524         tmp = strtoul(val, NULL, 0);
 525         if (errno) {
 526                 rte_errno = errno;
 527                 WARN("%s: \"%s\" is not a valid integer", key, val);
 528                 return -rte_errno;
 529         }
 530         if (strcmp(MLX4_PMD_PORT_KVARG, key) == 0) {
 531                 uint32_t ports = rte_log2_u32(conf->ports.present + 1);
 532
 533                 if (tmp >= ports) {
 534                         ERROR("port index %lu outside range [0,%" PRIu32 ")",
 535                               tmp, ports);
 536                         return -EINVAL;
 537                 }
 538                 if (!(conf->ports.present & (1 << tmp))) {
 539                         rte_errno = EINVAL;
 540                         ERROR("invalid port index %lu", tmp);
 541                         return -rte_errno;
 542                 }
 543                 conf->ports.enabled |= 1 << tmp;
 544         } else if (strcmp(MLX4_MR_EXT_MEMSEG_EN_KVARG, key) == 0) {
 545                 conf->mr_ext_memseg_en = !!tmp;
 546         } else {
 547                 rte_errno = EINVAL;
 548                 WARN("%s: unknown parameter", key);
 549                 return -rte_errno;
 550         }
 551         return 0;
 552 }
 553
 554 /**
 555  * Parse device parameters.
 556  *
 557  * @param devargs
 558  *   Device arguments structure.
 559  *
 560  * @return
 561  *   0 on success, negative errno value otherwise and rte_errno is set.
 562  */
 563 static int
 564 mlx4_args(struct rte_devargs *devargs, struct mlx4_conf *conf)
 565 {
 566         struct rte_kvargs *kvlist;
 567         unsigned int arg_count;
 568         int ret = 0;
 569         int i;
 570
 571         if (devargs == NULL)
 572                 return 0;
 573         kvlist = rte_kvargs_parse(devargs->args, pmd_mlx4_init_params);
 574         if (kvlist == NULL) {
 575                 rte_errno = EINVAL;
 576                 ERROR("failed to parse kvargs");
 577                 return -rte_errno;
 578         }
 579         /* Process parameters. */
 580         for (i = 0; pmd_mlx4_init_params[i]; ++i) {
 581                 arg_count = rte_kvargs_count(kvlist, pmd_mlx4_init_params[i]);
 582                 while (arg_count-- > 0) {
 583                         ret = rte_kvargs_process(kvlist,
 584                                                  pmd_mlx4_init_params[i],
 585                                                  (int (*)(const char *,
 586                                                           const char *,
 587                                                           void *))
 588                                                  mlx4_arg_parse,
 589                                                  conf);
 590                         if (ret != 0)
 591                                 goto free_kvlist;
 592                 }
 593         }
 594 free_kvlist:
 595         rte_kvargs_free(kvlist);
 596         return ret;
 597 }
 598
 599 /**
 600  * Interpret RSS capabilities reported by device.
 601  *
 602  * This function returns the set of usable Verbs RSS hash fields, kernel
 603  * quirks taken into account.
 604  *
 605  * @param ctx
 606  *   Verbs context.
 607  * @param pd
 608  *   Verbs protection domain.
 609  * @param device_attr_ex
 610  *   Extended device attributes to interpret.
 611  *
 612  * @return
 613  *   Usable RSS hash fields mask in Verbs format.
 614  */
 615 static uint64_t
 616 mlx4_hw_rss_sup(struct ibv_context *ctx, struct ibv_pd *pd,
 617                 struct ibv_device_attr_ex *device_attr_ex)
 618 {
 619         uint64_t hw_rss_sup = device_attr_ex->rss_caps.rx_hash_fields_mask;
 620         struct ibv_cq *cq = NULL;
 621         struct ibv_wq *wq = NULL;
 622         struct ibv_rwq_ind_table *ind = NULL;
 623         struct ibv_qp *qp = NULL;
 624
 625         if (!hw_rss_sup) {
 626                 WARN("no RSS capabilities reported; disabling support for UDP"
 627                      " RSS and inner VXLAN RSS");
 628                 return IBV_RX_HASH_SRC_IPV4 | IBV_RX_HASH_DST_IPV4 |
 629                         IBV_RX_HASH_SRC_IPV6 | IBV_RX_HASH_DST_IPV6 |
 630                         IBV_RX_HASH_SRC_PORT_TCP | IBV_RX_HASH_DST_PORT_TCP;
 631         }
 632         if (!(hw_rss_sup & IBV_RX_HASH_INNER))
 633                 return hw_rss_sup;
 634         /*
 635          * Although reported as supported, missing code in some Linux
 636          * versions (v4.15, v4.16) prevents the creation of hash QPs with
 637          * inner capability.
 638          *
 639          * There is no choice but to attempt to instantiate a temporary RSS
 640          * context in order to confirm its support.
 641          */
 642         cq = mlx4_glue->create_cq(ctx, 1, NULL, NULL, 0);
 643         wq = cq ? mlx4_glue->create_wq
 644                 (ctx,
 645                  &(struct ibv_wq_init_attr){
 646                         .wq_type = IBV_WQT_RQ,
 647                         .max_wr = 1,
 648                         .max_sge = 1,
 649                         .pd = pd,
 650                         .cq = cq,
 651                  }) : NULL;
 652         ind = wq ? mlx4_glue->create_rwq_ind_table
 653                 (ctx,
 654                  &(struct ibv_rwq_ind_table_init_attr){
 655                         .log_ind_tbl_size = 0,
 656                         .ind_tbl = &wq,
 657                         .comp_mask = 0,
 658                  }) : NULL;
 659         qp = ind ? mlx4_glue->create_qp_ex
 660                 (ctx,
 661                  &(struct ibv_qp_init_attr_ex){
 662                         .comp_mask =
 663                                 (IBV_QP_INIT_ATTR_PD |
 664                                  IBV_QP_INIT_ATTR_RX_HASH |
 665                                  IBV_QP_INIT_ATTR_IND_TABLE),
 666                         .qp_type = IBV_QPT_RAW_PACKET,
 667                         .pd = pd,
 668                         .rwq_ind_tbl = ind,
 669                         .rx_hash_conf = {
 670                                 .rx_hash_function = IBV_RX_HASH_FUNC_TOEPLITZ,
 671                                 .rx_hash_key_len = MLX4_RSS_HASH_KEY_SIZE,
 672                                 .rx_hash_key = mlx4_rss_hash_key_default,
 673                                 .rx_hash_fields_mask = hw_rss_sup,
 674                         },
 675                  }) : NULL;
 676         if (!qp) {
 677                 WARN("disabling unusable inner RSS capability due to kernel"
 678                      " quirk");
 679                 hw_rss_sup &= ~IBV_RX_HASH_INNER;
 680         } else {
 681                 claim_zero(mlx4_glue->destroy_qp(qp));
 682         }
 683         if (ind)
 684                 claim_zero(mlx4_glue->destroy_rwq_ind_table(ind));
 685         if (wq)
 686                 claim_zero(mlx4_glue->destroy_wq(wq));
 687         if (cq)
 688                 claim_zero(mlx4_glue->destroy_cq(cq));
 689         return hw_rss_sup;
 690 }
 691
 692 static struct rte_pci_driver mlx4_driver;
 693
 694 /**
 695  * PMD global initialization.
 696  *
 697  * Independent from individual device, this function initializes global
 698  * per-PMD data structures distinguishing primary and secondary processes.
 699  * Hence, each initialization is called once per a process.
 700  *
 701  * @return
 702  *   0 on success, a negative errno value otherwise and rte_errno is set.
 703  */
 704 static int
 705 mlx4_init_once(void)
 706 {
 707         struct mlx4_shared_data *sd;
 708         struct mlx4_local_data *ld = &mlx4_local_data;
 709         int ret = 0;
 710
 711         if (mlx4_init_shared_data())
 712                 return -rte_errno;
 713         sd = mlx4_shared_data;
 714         MLX4_ASSERT(sd);
 715         rte_spinlock_lock(&sd->lock);
 716         switch (rte_eal_process_type()) {
 717         case RTE_PROC_PRIMARY:
 718                 if (sd->init_done)
 719                         break;
 720                 LIST_INIT(&sd->mem_event_cb_list);
 721                 rte_rwlock_init(&sd->mem_event_rwlock);
 722                 rte_mem_event_callback_register("MLX4_MEM_EVENT_CB",
 723                                                 mlx4_mr_mem_event_cb, NULL);
 724                 ret = mlx4_mp_init_primary();
 725                 if (ret)
 726                         goto out;
 727                 sd->init_done = 1;
 728                 break;
 729         case RTE_PROC_SECONDARY:
 730                 if (ld->init_done)
 731                         break;
 732                 ret = mlx4_mp_init_secondary();
 733                 if (ret)
 734                         goto out;
 735                 ++sd->secondary_cnt;
 736                 ld->init_done = 1;
 737                 break;
 738         default:
 739                 break;
 740         }
 741 out:
 742         rte_spinlock_unlock(&sd->lock);
 743         return ret;
 744 }
 745
 746 /**
 747  * DPDK callback to register a PCI device.
 748  *
 749  * This function creates an Ethernet device for each port of a given
 750  * PCI device.
 751  *
 752  * @param[in] pci_drv
 753  *   PCI driver structure (mlx4_driver).
 754  * @param[in] pci_dev
 755  *   PCI device information.
 756  *
 757  * @return
 758  *   0 on success, negative errno value otherwise and rte_errno is set.
 759  */
 760 static int
 761 mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 762 {
 763         struct ibv_device **list;
 764         struct ibv_device *ibv_dev;
 765         int err = 0;
 766         struct ibv_context *attr_ctx = NULL;
 767         struct ibv_device_attr device_attr;
 768         struct ibv_device_attr_ex device_attr_ex;
 769         struct rte_eth_dev *prev_dev = NULL;
 770         struct mlx4_conf conf = {
 771                 .ports.present = 0,
 772                 .mr_ext_memseg_en = 1,
 773         };
 774         unsigned int vf;
 775         int i;
 776         char ifname[IF_NAMESIZE];
 777
 778         (void)pci_drv;
 779         err = mlx4_init_once();
 780         if (err) {
 781                 ERROR("unable to init PMD global data: %s",
 782                       strerror(rte_errno));
 783                 return -rte_errno;
 784         }
 785         MLX4_ASSERT(pci_drv == &mlx4_driver);
 786         list = mlx4_glue->get_device_list(&i);
 787         if (list == NULL) {
 788                 rte_errno = errno;
 789                 MLX4_ASSERT(rte_errno);
 790                 if (rte_errno == ENOSYS)
 791                         ERROR("cannot list devices, is ib_uverbs loaded?");
 792                 return -rte_errno;
 793         }
 794         MLX4_ASSERT(i >= 0);
 795         /*
 796          * For each listed device, check related sysfs entry against
 797          * the provided PCI ID.
 798          */
 799         while (i != 0) {
 800                 struct rte_pci_addr pci_addr;
 801
 802                 --i;
 803                 DEBUG("checking device \"%s\"", list[i]->name);
 804                 if (mlx4_ibv_device_to_pci_addr(list[i], &pci_addr))
 805                         continue;
 806                 if ((pci_dev->addr.domain != pci_addr.domain) ||
 807                     (pci_dev->addr.bus != pci_addr.bus) ||
 808                     (pci_dev->addr.devid != pci_addr.devid) ||
 809                     (pci_dev->addr.function != pci_addr.function))
 810                         continue;
 811                 vf = (pci_dev->id.device_id ==
 812                       PCI_DEVICE_ID_MELLANOX_CONNECTX3VF);
 813                 INFO("PCI information matches, using device \"%s\" (VF: %s)",
 814                      list[i]->name, (vf ? "true" : "false"));
 815                 attr_ctx = mlx4_glue->open_device(list[i]);
 816                 err = errno;
 817                 break;
 818         }
 819         if (attr_ctx == NULL) {
 820                 mlx4_glue->free_device_list(list);
 821                 switch (err) {
 822                 case 0:
 823                         rte_errno = ENODEV;
 824                         ERROR("cannot access device, is mlx4_ib loaded?");
 825                         return -rte_errno;
 826                 case EINVAL:
 827                         rte_errno = EINVAL;
 828                         ERROR("cannot use device, are drivers up to date?");
 829                         return -rte_errno;
 830                 }
 831                 MLX4_ASSERT(err > 0);
 832                 rte_errno = err;
 833                 return -rte_errno;
 834         }
 835         ibv_dev = list[i];
 836         DEBUG("device opened");
 837         if (mlx4_glue->query_device(attr_ctx, &device_attr)) {
 838                 err = ENODEV;
 839                 goto error;
 840         }
 841         INFO("%u port(s) detected", device_attr.phys_port_cnt);
 842         conf.ports.present |= (UINT64_C(1) << device_attr.phys_port_cnt) - 1;
 843         if (mlx4_args(pci_dev->device.devargs, &conf)) {
 844                 ERROR("failed to process device arguments");
 845                 err = EINVAL;
 846                 goto error;
 847         }
 848         /* Use all ports when none are defined */
 849         if (!conf.ports.enabled)
 850                 conf.ports.enabled = conf.ports.present;
 851         /* Retrieve extended device attributes. */
 852         if (mlx4_glue->query_device_ex(attr_ctx, NULL, &device_attr_ex)) {
 853                 err = ENODEV;
 854                 goto error;
 855         }
 856         MLX4_ASSERT(device_attr.max_sge >= MLX4_MAX_SGE);
 857         for (i = 0; i < device_attr.phys_port_cnt; i++) {
 858                 uint32_t port = i + 1; /* ports are indexed from one */
 859                 struct ibv_context *ctx = NULL;
 860                 struct ibv_port_attr port_attr;
 861                 struct ibv_pd *pd = NULL;
 862                 struct mlx4_priv *priv = NULL;
 863                 struct rte_eth_dev *eth_dev = NULL;
 864                 struct rte_ether_addr mac;
 865                 char name[RTE_ETH_NAME_MAX_LEN];
 866
 867                 /* If port is not enabled, skip. */
 868                 if (!(conf.ports.enabled & (1 << i)))
 869                         continue;
 870                 DEBUG("using port %u", port);
 871                 ctx = mlx4_glue->open_device(ibv_dev);
 872                 if (ctx == NULL) {
 873                         err = ENODEV;
 874                         goto port_error;
 875                 }
 876                 snprintf(name, sizeof(name), "%s port %u",
 877                          mlx4_glue->get_device_name(ibv_dev), port);
 878                 if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
 879                         eth_dev = rte_eth_dev_attach_secondary(name);
 880                         if (eth_dev == NULL) {
 881                                 ERROR("can not attach rte ethdev");
 882                                 rte_errno = ENOMEM;
 883                                 err = rte_errno;
 884                                 goto err_secondary;
 885                         }
 886                         priv = eth_dev->data->dev_private;
 887                         if (!priv->verbs_alloc_ctx.enabled) {
 888                                 ERROR("secondary process is not supported"
 889                                       " due to lack of external allocator"
 890                                       " from Verbs");
 891                                 rte_errno = ENOTSUP;
 892                                 err = rte_errno;
 893                                 goto err_secondary;
 894                         }
 895                         eth_dev->device = &pci_dev->device;
 896                         eth_dev->dev_ops = &mlx4_dev_sec_ops;
 897                         err = mlx4_proc_priv_init(eth_dev);
 898                         if (err)
 899                                 goto err_secondary;
 900                         /* Receive command fd from primary process. */
 901                         err = mlx4_mp_req_verbs_cmd_fd(eth_dev);
 902                         if (err < 0) {
 903                                 err = rte_errno;
 904                                 goto err_secondary;
 905                         }
 906                         /* Remap UAR for Tx queues. */
 907                         err = mlx4_tx_uar_init_secondary(eth_dev, err);
 908                         if (err) {
 909                                 err = rte_errno;
 910                                 goto err_secondary;
 911                         }
 912                         /*
 913                          * Ethdev pointer is still required as input since
 914                          * the primary device is not accessible from the
 915                          * secondary process.
 916                          */
 917                         eth_dev->tx_pkt_burst = mlx4_tx_burst;
 918                         eth_dev->rx_pkt_burst = mlx4_rx_burst;
 919                         claim_zero(mlx4_glue->close_device(ctx));
 920                         rte_eth_copy_pci_info(eth_dev, pci_dev);
 921                         rte_eth_dev_probing_finish(eth_dev);
 922                         prev_dev = eth_dev;
 923                         continue;
 924 err_secondary:
 925                         claim_zero(mlx4_glue->close_device(ctx));
 926                         rte_eth_dev_release_port(eth_dev);
 927                         if (prev_dev)
 928                                 rte_eth_dev_release_port(prev_dev);
 929                         break;
 930                 }
 931                 /* Check port status. */
 932                 err = mlx4_glue->query_port(ctx, port, &port_attr);
 933                 if (err) {
 934                         err = ENODEV;
 935                         ERROR("port query failed: %s", strerror(err));
 936                         goto port_error;
 937                 }
 938                 if (port_attr.link_layer != IBV_LINK_LAYER_ETHERNET) {
 939                         err = ENOTSUP;
 940                         ERROR("port %d is not configured in Ethernet mode",
 941                               port);
 942                         goto port_error;
 943                 }
 944                 if (port_attr.state != IBV_PORT_ACTIVE)
 945                         DEBUG("port %d is not active: \"%s\" (%d)",
 946                               port, mlx4_glue->port_state_str(port_attr.state),
 947                               port_attr.state);
 948                 /* Make asynchronous FD non-blocking to handle interrupts. */
 949                 err = mlx4_fd_set_non_blocking(ctx->async_fd);
 950                 if (err) {
 951                         ERROR("cannot make asynchronous FD non-blocking: %s",
 952                               strerror(err));
 953                         goto port_error;
 954                 }
 955                 /* Allocate protection domain. */
 956                 pd = mlx4_glue->alloc_pd(ctx);
 957                 if (pd == NULL) {
 958                         err = ENOMEM;
 959                         ERROR("PD allocation failure");
 960                         goto port_error;
 961                 }
 962                 /* from rte_ethdev.c */
 963                 priv = rte_zmalloc("ethdev private structure",
 964                                    sizeof(*priv),
 965                                    RTE_CACHE_LINE_SIZE);
 966                 if (priv == NULL) {
 967                         err = ENOMEM;
 968                         ERROR("priv allocation failure");
 969                         goto port_error;
 970                 }
 971                 priv->ctx = ctx;
 972                 priv->device_attr = device_attr;
 973                 priv->port = port;
 974                 priv->pd = pd;
 975                 priv->mtu = RTE_ETHER_MTU;
 976                 priv->vf = vf;
 977                 priv->hw_csum = !!(device_attr.device_cap_flags &
 978                                    IBV_DEVICE_RAW_IP_CSUM);
 979                 DEBUG("checksum offloading is %ssupported",
 980                       (priv->hw_csum ? "" : "not "));
 981                 /* Only ConnectX-3 Pro supports tunneling. */
 982                 priv->hw_csum_l2tun =
 983                         priv->hw_csum &&
 984                         (device_attr.vendor_part_id ==
 985                          PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO);
 986                 DEBUG("L2 tunnel checksum offloads are %ssupported",
 987                       priv->hw_csum_l2tun ? "" : "not ");
 988                 priv->hw_rss_sup = mlx4_hw_rss_sup(priv->ctx, priv->pd,
 989                                                    &device_attr_ex);
 990                 DEBUG("supported RSS hash fields mask: %016" PRIx64,
 991                       priv->hw_rss_sup);
 992                 priv->hw_rss_max_qps =
 993                         device_attr_ex.rss_caps.max_rwq_indirection_table_size;
 994                 DEBUG("MAX RSS queues %d", priv->hw_rss_max_qps);
 995                 priv->hw_fcs_strip = !!(device_attr_ex.raw_packet_caps &
 996                                         IBV_RAW_PACKET_CAP_SCATTER_FCS);
 997                 DEBUG("FCS stripping toggling is %ssupported",
 998                       priv->hw_fcs_strip ? "" : "not ");
 999                 priv->tso =
1000                         ((device_attr_ex.tso_caps.max_tso > 0) &&
1001                          (device_attr_ex.tso_caps.supported_qpts &
1002                           (1 << IBV_QPT_RAW_PACKET)));
1003                 if (priv->tso)
1004                         priv->tso_max_payload_sz =
1005                                         device_attr_ex.tso_caps.max_tso;
1006                 DEBUG("TSO is %ssupported",
1007                       priv->tso ? "" : "not ");
1008                 priv->mr_ext_memseg_en = conf.mr_ext_memseg_en;
1009                 /* Configure the first MAC address by default. */
1010                 err = mlx4_get_mac(priv, &mac.addr_bytes);
1011                 if (err) {
1012                         ERROR("cannot get MAC address, is mlx4_en loaded?"
1013                               " (error: %s)", strerror(err));
1014                         goto port_error;
1015                 }
1016                 INFO("port %u MAC address is %02x:%02x:%02x:%02x:%02x:%02x",
1017                      priv->port,
1018                      mac.addr_bytes[0], mac.addr_bytes[1],
1019                      mac.addr_bytes[2], mac.addr_bytes[3],
1020                      mac.addr_bytes[4], mac.addr_bytes[5]);
1021                 /* Register MAC address. */
1022                 priv->mac[0] = mac;
1023
1024                 if (mlx4_get_ifname(priv, &ifname) == 0) {
1025                         DEBUG("port %u ifname is \"%s\"",
1026                               priv->port, ifname);
1027                         priv->if_index = if_nametoindex(ifname);
1028                 } else {
1029                         DEBUG("port %u ifname is unknown", priv->port);
1030                 }
1031
1032                 /* Get actual MTU if possible. */
1033                 mlx4_mtu_get(priv, &priv->mtu);
1034                 DEBUG("port %u MTU is %u", priv->port, priv->mtu);
1035                 eth_dev = rte_eth_dev_allocate(name);
1036                 if (eth_dev == NULL) {
1037                         err = ENOMEM;
1038                         ERROR("can not allocate rte ethdev");
1039                         goto port_error;
1040                 }
1041                 eth_dev->data->dev_private = priv;
1042                 eth_dev->data->mac_addrs = priv->mac;
1043                 eth_dev->device = &pci_dev->device;
1044                 rte_eth_copy_pci_info(eth_dev, pci_dev);
1045                 eth_dev->data->dev_flags |= RTE_ETH_DEV_AUTOFILL_QUEUE_XSTATS;
1046                 /* Initialize local interrupt handle for current port. */
1047                 memset(&priv->intr_handle, 0, sizeof(struct rte_intr_handle));
1048                 priv->intr_handle.fd = -1;
1049                 priv->intr_handle.type = RTE_INTR_HANDLE_EXT;
1050                 /*
1051                  * Override ethdev interrupt handle pointer with private
1052                  * handle instead of that of the parent PCI device used by
1053                  * default. This prevents it from being shared between all
1054                  * ports of the same PCI device since each of them is
1055                  * associated its own Verbs context.
1056                  *
1057                  * Rx interrupts in particular require this as the PMD has
1058                  * no control over the registration of queue interrupts
1059                  * besides setting up eth_dev->intr_handle, the rest is
1060                  * handled by rte_intr_rx_ctl().
1061                  */
1062                 eth_dev->intr_handle = &priv->intr_handle;
1063                 priv->dev_data = eth_dev->data;
1064                 eth_dev->dev_ops = &mlx4_dev_ops;
1065 #ifdef HAVE_IBV_MLX4_BUF_ALLOCATORS
1066                 /* Hint libmlx4 to use PMD allocator for data plane resources */
1067                 err = mlx4_glue->dv_set_context_attr
1068                         (ctx, MLX4DV_SET_CTX_ATTR_BUF_ALLOCATORS,
1069                          (void *)((uintptr_t)&(struct mlx4dv_ctx_allocators){
1070                                  .alloc = &mlx4_alloc_verbs_buf,
1071                                  .free = &mlx4_free_verbs_buf,
1072                                  .data = priv,
1073                         }));
1074                 if (err)
1075                         WARN("Verbs external allocator is not supported");
1076                 else
1077                         priv->verbs_alloc_ctx.enabled = 1;
1078 #endif
1079                 /* Bring Ethernet device up. */
1080                 DEBUG("forcing Ethernet interface up");
1081                 mlx4_dev_set_link_up(eth_dev);
1082                 /* Update link status once if waiting for LSC. */
1083                 if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
1084                         mlx4_link_update(eth_dev, 0);
1085                 /*
1086                  * Once the device is added to the list of memory event
1087                  * callback, its global MR cache table cannot be expanded
1088                  * on the fly because of deadlock. If it overflows, lookup
1089                  * should be done by searching MR list linearly, which is slow.
1090                  */
1091                 err = mlx4_mr_btree_init(&priv->mr.cache,
1092                                          MLX4_MR_BTREE_CACHE_N * 2,
1093                                          eth_dev->device->numa_node);
1094                 if (err) {
1095                         /* rte_errno is already set. */
1096                         goto port_error;
1097                 }
1098                 /* Add device to memory callback list. */
1099                 rte_rwlock_write_lock(&mlx4_shared_data->mem_event_rwlock);
1100                 LIST_INSERT_HEAD(&mlx4_shared_data->mem_event_cb_list,
1101                                  priv, mem_event_cb);
1102                 rte_rwlock_write_unlock(&mlx4_shared_data->mem_event_rwlock);
1103                 rte_eth_dev_probing_finish(eth_dev);
1104                 prev_dev = eth_dev;
1105                 continue;
1106 port_error:
1107                 rte_free(priv);
1108                 if (eth_dev != NULL)
1109                         eth_dev->data->dev_private = NULL;
1110                 if (pd)
1111                         claim_zero(mlx4_glue->dealloc_pd(pd));
1112                 if (ctx)
1113                         claim_zero(mlx4_glue->close_device(ctx));
1114                 if (eth_dev != NULL) {
1115                         /* mac_addrs must not be freed because part of dev_private */
1116                         eth_dev->data->mac_addrs = NULL;
1117                         rte_eth_dev_release_port(eth_dev);
1118                 }
1119                 if (prev_dev)
1120                         mlx4_dev_close(prev_dev);
1121                 break;
1122         }
1123 error:
1124         if (attr_ctx)
1125                 claim_zero(mlx4_glue->close_device(attr_ctx));
1126         if (list)
1127                 mlx4_glue->free_device_list(list);
1128         if (err)
1129                 rte_errno = err;
1130         return -err;
1131 }
1132
1133 /**
1134  * DPDK callback to remove a PCI device.
1135  *
1136  * This function removes all Ethernet devices belong to a given PCI device.
1137  *
1138  * @param[in] pci_dev
1139  *   Pointer to the PCI device.
1140  *
1141  * @return
1142  *   0 on success, the function cannot fail.
1143  */
1144 static int
1145 mlx4_pci_remove(struct rte_pci_device *pci_dev)
1146 {
1147         uint16_t port_id;
1148         int ret = 0;
1149
1150         RTE_ETH_FOREACH_DEV_OF(port_id, &pci_dev->device) {
1151                 /*
1152                  * mlx4_dev_close() is not registered to secondary process,
1153                  * call the close function explicitly for secondary process.
1154                  */
1155                 if (rte_eal_process_type() == RTE_PROC_SECONDARY)
1156                         ret |= mlx4_dev_close(&rte_eth_devices[port_id]);
1157                 else
1158                         ret |= rte_eth_dev_close(port_id);
1159         }
1160         return ret == 0 ? 0 : -EIO;
1161 }
1162
1163 static const struct rte_pci_id mlx4_pci_id_map[] = {
1164         {
1165                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1166                                PCI_DEVICE_ID_MELLANOX_CONNECTX3)
1167         },
1168         {
1169                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1170                                PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO)
1171         },
1172         {
1173                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
1174                                PCI_DEVICE_ID_MELLANOX_CONNECTX3VF)
1175         },
1176         {
1177                 .vendor_id = 0
1178         }
1179 };
1180
1181 static struct rte_pci_driver mlx4_driver = {
1182         .driver = {
1183                 .name = MLX4_DRIVER_NAME
1184         },
1185         .id_table = mlx4_pci_id_map,
1186         .probe = mlx4_pci_probe,
1187         .remove = mlx4_pci_remove,
1188         .drv_flags = RTE_PCI_DRV_INTR_LSC | RTE_PCI_DRV_INTR_RMV,
1189 };
1190
1191 #ifdef RTE_IBVERBS_LINK_DLOPEN
1192
1193 /**
1194  * Suffix RTE_EAL_PMD_PATH with "-glue".
1195  *
1196  * This function performs a sanity check on RTE_EAL_PMD_PATH before
1197  * suffixing its last component.
1198  *
1199  * @param buf[out]
1200  *   Output buffer, should be large enough otherwise NULL is returned.
1201  * @param size
1202  *   Size of @p out.
1203  *
1204  * @return
1205  *   Pointer to @p buf or @p NULL in case suffix cannot be appended.
1206  */
1207 static char *
1208 mlx4_glue_path(char *buf, size_t size)
1209 {
1210         static const char *const bad[] = { "/", ".", "..", NULL };
1211         const char *path = RTE_EAL_PMD_PATH;
1212         size_t len = strlen(path);
1213         size_t off;
1214         int i;
1215
1216         while (len && path[len - 1] == '/')
1217                 --len;
1218         for (off = len; off && path[off - 1] != '/'; --off)
1219                 ;
1220         for (i = 0; bad[i]; ++i)
1221                 if (!strncmp(path + off, bad[i], (int)(len - off)))
1222                         goto error;
1223         i = snprintf(buf, size, "%.*s-glue", (int)len, path);
1224         if (i == -1 || (size_t)i >= size)
1225                 goto error;
1226         return buf;
1227 error:
1228         ERROR("unable to append \"-glue\" to last component of"
1229               " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"),"
1230               " please re-configure DPDK");
1231         return NULL;
1232 }
1233
1234 /**
1235  * Initialization routine for run-time dependency on rdma-core.
1236  */
1237 static int
1238 mlx4_glue_init(void)
1239 {
1240         char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
1241         const char *path[] = {
1242                 /*
1243                  * A basic security check is necessary before trusting
1244                  * MLX4_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
1245                  */
1246                 (geteuid() == getuid() && getegid() == getgid() ?
1247                  getenv("MLX4_GLUE_PATH") : NULL),
1248                 /*
1249                  * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
1250                  * variant, otherwise let dlopen() look up libraries on its
1251                  * own.
1252                  */
1253                 (*RTE_EAL_PMD_PATH ?
1254                  mlx4_glue_path(glue_path, sizeof(glue_path)) : ""),
1255         };
1256         unsigned int i = 0;
1257         void *handle = NULL;
1258         void **sym;
1259         const char *dlmsg;
1260
1261         while (!handle && i != RTE_DIM(path)) {
1262                 const char *end;
1263                 size_t len;
1264                 int ret;
1265
1266                 if (!path[i]) {
1267                         ++i;
1268                         continue;
1269                 }
1270                 end = strpbrk(path[i], ":;");
1271                 if (!end)
1272                         end = path[i] + strlen(path[i]);
1273                 len = end - path[i];
1274                 ret = 0;
1275                 do {
1276                         char name[ret + 1];
1277
1278                         ret = snprintf(name, sizeof(name), "%.*s%s" MLX4_GLUE,
1279                                        (int)len, path[i],
1280                                        (!len || *(end - 1) == '/') ? "" : "/");
1281                         if (ret == -1)
1282                                 break;
1283                         if (sizeof(name) != (size_t)ret + 1)
1284                                 continue;
1285                         DEBUG("looking for rdma-core glue as \"%s\"", name);
1286                         handle = dlopen(name, RTLD_LAZY);
1287                         break;
1288                 } while (1);
1289                 path[i] = end + 1;
1290                 if (!*end)
1291                         ++i;
1292         }
1293         if (!handle) {
1294                 rte_errno = EINVAL;
1295                 dlmsg = dlerror();
1296                 if (dlmsg)
1297                         WARN("cannot load glue library: %s", dlmsg);
1298                 goto glue_error;
1299         }
1300         sym = dlsym(handle, "mlx4_glue");
1301         if (!sym || !*sym) {
1302                 rte_errno = EINVAL;
1303                 dlmsg = dlerror();
1304                 if (dlmsg)
1305                         ERROR("cannot resolve glue symbol: %s", dlmsg);
1306                 goto glue_error;
1307         }
1308         mlx4_glue = *sym;
1309         return 0;
1310 glue_error:
1311         if (handle)
1312                 dlclose(handle);
1313         WARN("cannot initialize PMD due to missing run-time"
1314              " dependency on rdma-core libraries (libibverbs,"
1315              " libmlx4)");
1316         return -rte_errno;
1317 }
1318
1319 #endif
1320
1321 /* Initialize driver log type. */
1322 RTE_LOG_REGISTER(mlx4_logtype, pmd.net.mlx4, NOTICE)
1323
1324 /**
1325  * Driver initialization routine.
1326  */
1327 RTE_INIT(rte_mlx4_pmd_init)
1328 {
1329         /*
1330          * MLX4_DEVICE_FATAL_CLEANUP tells ibv_destroy functions we
1331          * want to get success errno value in case of calling them
1332          * when the device was removed.
1333          */
1334         setenv("MLX4_DEVICE_FATAL_CLEANUP", "1", 1);
1335         /*
1336          * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
1337          * huge pages. Calling ibv_fork_init() during init allows
1338          * applications to use fork() safely for purposes other than
1339          * using this PMD, which is not supported in forked processes.
1340          */
1341         setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
1342 #ifdef RTE_IBVERBS_LINK_DLOPEN
1343         if (mlx4_glue_init())
1344                 return;
1345         MLX4_ASSERT(mlx4_glue);
1346 #endif
1347 #ifdef RTE_LIBRTE_MLX4_DEBUG
1348         /* Glue structure must not contain any NULL pointers. */
1349         {
1350                 unsigned int i;
1351
1352                 for (i = 0; i != sizeof(*mlx4_glue) / sizeof(void *); ++i)
1353                         MLX4_ASSERT(((const void *const *)mlx4_glue)[i]);
1354         }
1355 #endif
1356         if (strcmp(mlx4_glue->version, MLX4_GLUE_VERSION)) {
1357                 ERROR("rdma-core glue \"%s\" mismatch: \"%s\" is required",
1358                       mlx4_glue->version, MLX4_GLUE_VERSION);
1359                 return;
1360         }
1361         mlx4_glue->fork_init();
1362         rte_pci_register(&mlx4_driver);
1363 }
1364
1365 RTE_PMD_EXPORT_NAME(net_mlx4, __COUNTER__);
1366 RTE_PMD_REGISTER_PCI_TABLE(net_mlx4, mlx4_pci_id_map);
1367 RTE_PMD_REGISTER_KMOD_DEP(net_mlx4,
1368         "* ib_uverbs & mlx4_en & mlx4_core & mlx4_ib");