drivers/net/mlx4/mlx4.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2012 6WIND S.A.
   3  * Copyright 2012 Mellanox Technologies, Ltd
   4  */
   5
   6 /**
   7  * @file
   8  * mlx4 driver initialization.
   9  */
  10
  11 #include <assert.h>
  12 #include <dlfcn.h>
  13 #include <errno.h>
  14 #include <inttypes.h>
  15 #include <stddef.h>
  16 #include <stdint.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21
  22 /* Verbs headers do not support -pedantic. */
  23 #ifdef PEDANTIC
  24 #pragma GCC diagnostic ignored "-Wpedantic"
  25 #endif
  26 #include <infiniband/verbs.h>
  27 #ifdef PEDANTIC
  28 #pragma GCC diagnostic error "-Wpedantic"
  29 #endif
  30
  31 #include <rte_common.h>
  32 #include <rte_config.h>
  33 #include <rte_dev.h>
  34 #include <rte_errno.h>
  35 #include <rte_ethdev_driver.h>
  36 #include <rte_ethdev_pci.h>
  37 #include <rte_ether.h>
  38 #include <rte_flow.h>
  39 #include <rte_interrupts.h>
  40 #include <rte_kvargs.h>
  41 #include <rte_malloc.h>
  42 #include <rte_mbuf.h>
  43
  44 #include "mlx4.h"
  45 #include "mlx4_glue.h"
  46 #include "mlx4_flow.h"
  47 #include "mlx4_mr.h"
  48 #include "mlx4_rxtx.h"
  49 #include "mlx4_utils.h"
  50
  51 struct mlx4_dev_list mlx4_mem_event_cb_list =
  52         LIST_HEAD_INITIALIZER(mlx4_mem_event_cb_list);
  53
  54 rte_rwlock_t mlx4_mem_event_rwlock = RTE_RWLOCK_INITIALIZER;
  55
  56 /** Configuration structure for device arguments. */
  57 struct mlx4_conf {
  58         struct {
  59                 uint32_t present; /**< Bit-field for existing ports. */
  60                 uint32_t enabled; /**< Bit-field for user-enabled ports. */
  61         } ports;
  62 };
  63
  64 /* Available parameters list. */
  65 const char *pmd_mlx4_init_params[] = {
  66         MLX4_PMD_PORT_KVARG,
  67         NULL,
  68 };
  69
  70 static void mlx4_dev_stop(struct rte_eth_dev *dev);
  71
  72 /**
  73  * DPDK callback for Ethernet device configuration.
  74  *
  75  * @param dev
  76  *   Pointer to Ethernet device structure.
  77  *
  78  * @return
  79  *   0 on success, negative errno value otherwise and rte_errno is set.
  80  */
  81 static int
  82 mlx4_dev_configure(struct rte_eth_dev *dev)
  83 {
  84         struct priv *priv = dev->data->dev_private;
  85         struct rte_flow_error error;
  86         int ret;
  87
  88         /* Prepare internal flow rules. */
  89         ret = mlx4_flow_sync(priv, &error);
  90         if (ret) {
  91                 ERROR("cannot set up internal flow rules (code %d, \"%s\"),"
  92                       " flow error type %d, cause %p, message: %s",
  93                       -ret, strerror(-ret), error.type, error.cause,
  94                       error.message ? error.message : "(unspecified)");
  95                 goto exit;
  96         }
  97         ret = mlx4_intr_install(priv);
  98         if (ret)
  99                 ERROR("%p: interrupt handler installation failed",
 100                       (void *)dev);
 101         /*
 102          * Once the device is added to the list of memory event callback, its
 103          * global MR cache table cannot be expanded on the fly because of
 104          * deadlock. If it overflows, lookup should be done by searching MR list
 105          * linearly, which is slow.
 106          */
 107         if (mlx4_mr_btree_init(&priv->mr.cache, MLX4_MR_BTREE_CACHE_N * 2,
 108                                dev->device->numa_node)) {
 109                 /* rte_errno is already set. */
 110                 return -rte_errno;
 111         }
 112         rte_rwlock_write_lock(&mlx4_mem_event_rwlock);
 113         LIST_INSERT_HEAD(&mlx4_mem_event_cb_list, priv, mem_event_cb);
 114         rte_rwlock_write_unlock(&mlx4_mem_event_rwlock);
 115 exit:
 116         return ret;
 117 }
 118
 119 /**
 120  * DPDK callback to start the device.
 121  *
 122  * Simulate device start by initializing common RSS resources and attaching
 123  * all configured flows.
 124  *
 125  * @param dev
 126  *   Pointer to Ethernet device structure.
 127  *
 128  * @return
 129  *   0 on success, negative errno value otherwise and rte_errno is set.
 130  */
 131 static int
 132 mlx4_dev_start(struct rte_eth_dev *dev)
 133 {
 134         struct priv *priv = dev->data->dev_private;
 135         struct rte_flow_error error;
 136         int ret;
 137
 138         if (priv->started)
 139                 return 0;
 140         DEBUG("%p: attaching configured flows to all RX queues", (void *)dev);
 141         priv->started = 1;
 142         ret = mlx4_rss_init(priv);
 143         if (ret) {
 144                 ERROR("%p: cannot initialize RSS resources: %s",
 145                       (void *)dev, strerror(-ret));
 146                 goto err;
 147         }
 148 #ifndef NDEBUG
 149         mlx4_mr_dump_dev(dev);
 150 #endif
 151         ret = mlx4_rxq_intr_enable(priv);
 152         if (ret) {
 153                 ERROR("%p: interrupt handler installation failed",
 154                      (void *)dev);
 155                 goto err;
 156         }
 157         ret = mlx4_flow_sync(priv, &error);
 158         if (ret) {
 159                 ERROR("%p: cannot attach flow rules (code %d, \"%s\"),"
 160                       " flow error type %d, cause %p, message: %s",
 161                       (void *)dev,
 162                       -ret, strerror(-ret), error.type, error.cause,
 163                       error.message ? error.message : "(unspecified)");
 164                 goto err;
 165         }
 166         rte_wmb();
 167         dev->tx_pkt_burst = mlx4_tx_burst;
 168         dev->rx_pkt_burst = mlx4_rx_burst;
 169         return 0;
 170 err:
 171         mlx4_dev_stop(dev);
 172         return ret;
 173 }
 174
 175 /**
 176  * DPDK callback to stop the device.
 177  *
 178  * Simulate device stop by detaching all configured flows.
 179  *
 180  * @param dev
 181  *   Pointer to Ethernet device structure.
 182  */
 183 static void
 184 mlx4_dev_stop(struct rte_eth_dev *dev)
 185 {
 186         struct priv *priv = dev->data->dev_private;
 187
 188         if (!priv->started)
 189                 return;
 190         DEBUG("%p: detaching flows from all RX queues", (void *)dev);
 191         priv->started = 0;
 192         dev->tx_pkt_burst = mlx4_tx_burst_removed;
 193         dev->rx_pkt_burst = mlx4_rx_burst_removed;
 194         rte_wmb();
 195         mlx4_flow_sync(priv, NULL);
 196         mlx4_rxq_intr_disable(priv);
 197         mlx4_rss_deinit(priv);
 198 }
 199
 200 /**
 201  * DPDK callback to close the device.
 202  *
 203  * Destroy all queues and objects, free memory.
 204  *
 205  * @param dev
 206  *   Pointer to Ethernet device structure.
 207  */
 208 static void
 209 mlx4_dev_close(struct rte_eth_dev *dev)
 210 {
 211         struct priv *priv = dev->data->dev_private;
 212         unsigned int i;
 213
 214         DEBUG("%p: closing device \"%s\"",
 215               (void *)dev,
 216               ((priv->ctx != NULL) ? priv->ctx->device->name : ""));
 217         dev->rx_pkt_burst = mlx4_rx_burst_removed;
 218         dev->tx_pkt_burst = mlx4_tx_burst_removed;
 219         rte_wmb();
 220         mlx4_flow_clean(priv);
 221         mlx4_rss_deinit(priv);
 222         for (i = 0; i != dev->data->nb_rx_queues; ++i)
 223                 mlx4_rx_queue_release(dev->data->rx_queues[i]);
 224         for (i = 0; i != dev->data->nb_tx_queues; ++i)
 225                 mlx4_tx_queue_release(dev->data->tx_queues[i]);
 226         mlx4_mr_release(dev);
 227         if (priv->pd != NULL) {
 228                 assert(priv->ctx != NULL);
 229                 claim_zero(mlx4_glue->dealloc_pd(priv->pd));
 230                 claim_zero(mlx4_glue->close_device(priv->ctx));
 231         } else
 232                 assert(priv->ctx == NULL);
 233         mlx4_intr_uninstall(priv);
 234         memset(priv, 0, sizeof(*priv));
 235 }
 236
 237 static const struct eth_dev_ops mlx4_dev_ops = {
 238         .dev_configure = mlx4_dev_configure,
 239         .dev_start = mlx4_dev_start,
 240         .dev_stop = mlx4_dev_stop,
 241         .dev_set_link_down = mlx4_dev_set_link_down,
 242         .dev_set_link_up = mlx4_dev_set_link_up,
 243         .dev_close = mlx4_dev_close,
 244         .link_update = mlx4_link_update,
 245         .promiscuous_enable = mlx4_promiscuous_enable,
 246         .promiscuous_disable = mlx4_promiscuous_disable,
 247         .allmulticast_enable = mlx4_allmulticast_enable,
 248         .allmulticast_disable = mlx4_allmulticast_disable,
 249         .mac_addr_remove = mlx4_mac_addr_remove,
 250         .mac_addr_add = mlx4_mac_addr_add,
 251         .mac_addr_set = mlx4_mac_addr_set,
 252         .stats_get = mlx4_stats_get,
 253         .stats_reset = mlx4_stats_reset,
 254         .dev_infos_get = mlx4_dev_infos_get,
 255         .dev_supported_ptypes_get = mlx4_dev_supported_ptypes_get,
 256         .vlan_filter_set = mlx4_vlan_filter_set,
 257         .rx_queue_setup = mlx4_rx_queue_setup,
 258         .tx_queue_setup = mlx4_tx_queue_setup,
 259         .rx_queue_release = mlx4_rx_queue_release,
 260         .tx_queue_release = mlx4_tx_queue_release,
 261         .flow_ctrl_get = mlx4_flow_ctrl_get,
 262         .flow_ctrl_set = mlx4_flow_ctrl_set,
 263         .mtu_set = mlx4_mtu_set,
 264         .filter_ctrl = mlx4_filter_ctrl,
 265         .rx_queue_intr_enable = mlx4_rx_intr_enable,
 266         .rx_queue_intr_disable = mlx4_rx_intr_disable,
 267         .is_removed = mlx4_is_removed,
 268 };
 269
 270 /**
 271  * Get PCI information from struct ibv_device.
 272  *
 273  * @param device
 274  *   Pointer to Ethernet device structure.
 275  * @param[out] pci_addr
 276  *   PCI bus address output buffer.
 277  *
 278  * @return
 279  *   0 on success, negative errno value otherwise and rte_errno is set.
 280  */
 281 static int
 282 mlx4_ibv_device_to_pci_addr(const struct ibv_device *device,
 283                             struct rte_pci_addr *pci_addr)
 284 {
 285         FILE *file;
 286         char line[32];
 287         MKSTR(path, "%s/device/uevent", device->ibdev_path);
 288
 289         file = fopen(path, "rb");
 290         if (file == NULL) {
 291                 rte_errno = errno;
 292                 return -rte_errno;
 293         }
 294         while (fgets(line, sizeof(line), file) == line) {
 295                 size_t len = strlen(line);
 296                 int ret;
 297
 298                 /* Truncate long lines. */
 299                 if (len == (sizeof(line) - 1))
 300                         while (line[(len - 1)] != '\n') {
 301                                 ret = fgetc(file);
 302                                 if (ret == EOF)
 303                                         break;
 304                                 line[(len - 1)] = ret;
 305                         }
 306                 /* Extract information. */
 307                 if (sscanf(line,
 308                            "PCI_SLOT_NAME="
 309                            "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n",
 310                            &pci_addr->domain,
 311                            &pci_addr->bus,
 312                            &pci_addr->devid,
 313                            &pci_addr->function) == 4) {
 314                         ret = 0;
 315                         break;
 316                 }
 317         }
 318         fclose(file);
 319         return 0;
 320 }
 321
 322 /**
 323  * Verify and store value for device argument.
 324  *
 325  * @param[in] key
 326  *   Key argument to verify.
 327  * @param[in] val
 328  *   Value associated with key.
 329  * @param[in, out] conf
 330  *   Shared configuration data.
 331  *
 332  * @return
 333  *   0 on success, negative errno value otherwise and rte_errno is set.
 334  */
 335 static int
 336 mlx4_arg_parse(const char *key, const char *val, struct mlx4_conf *conf)
 337 {
 338         unsigned long tmp;
 339
 340         errno = 0;
 341         tmp = strtoul(val, NULL, 0);
 342         if (errno) {
 343                 rte_errno = errno;
 344                 WARN("%s: \"%s\" is not a valid integer", key, val);
 345                 return -rte_errno;
 346         }
 347         if (strcmp(MLX4_PMD_PORT_KVARG, key) == 0) {
 348                 uint32_t ports = rte_log2_u32(conf->ports.present + 1);
 349
 350                 if (tmp >= ports) {
 351                         ERROR("port index %lu outside range [0,%" PRIu32 ")",
 352                               tmp, ports);
 353                         return -EINVAL;
 354                 }
 355                 if (!(conf->ports.present & (1 << tmp))) {
 356                         rte_errno = EINVAL;
 357                         ERROR("invalid port index %lu", tmp);
 358                         return -rte_errno;
 359                 }
 360                 conf->ports.enabled |= 1 << tmp;
 361         } else {
 362                 rte_errno = EINVAL;
 363                 WARN("%s: unknown parameter", key);
 364                 return -rte_errno;
 365         }
 366         return 0;
 367 }
 368
 369 /**
 370  * Parse device parameters.
 371  *
 372  * @param devargs
 373  *   Device arguments structure.
 374  *
 375  * @return
 376  *   0 on success, negative errno value otherwise and rte_errno is set.
 377  */
 378 static int
 379 mlx4_args(struct rte_devargs *devargs, struct mlx4_conf *conf)
 380 {
 381         struct rte_kvargs *kvlist;
 382         unsigned int arg_count;
 383         int ret = 0;
 384         int i;
 385
 386         if (devargs == NULL)
 387                 return 0;
 388         kvlist = rte_kvargs_parse(devargs->args, pmd_mlx4_init_params);
 389         if (kvlist == NULL) {
 390                 rte_errno = EINVAL;
 391                 ERROR("failed to parse kvargs");
 392                 return -rte_errno;
 393         }
 394         /* Process parameters. */
 395         for (i = 0; pmd_mlx4_init_params[i]; ++i) {
 396                 arg_count = rte_kvargs_count(kvlist, MLX4_PMD_PORT_KVARG);
 397                 while (arg_count-- > 0) {
 398                         ret = rte_kvargs_process(kvlist,
 399                                                  MLX4_PMD_PORT_KVARG,
 400                                                  (int (*)(const char *,
 401                                                           const char *,
 402                                                           void *))
 403                                                  mlx4_arg_parse,
 404                                                  conf);
 405                         if (ret != 0)
 406                                 goto free_kvlist;
 407                 }
 408         }
 409 free_kvlist:
 410         rte_kvargs_free(kvlist);
 411         return ret;
 412 }
 413
 414 /**
 415  * Interpret RSS capabilities reported by device.
 416  *
 417  * This function returns the set of usable Verbs RSS hash fields, kernel
 418  * quirks taken into account.
 419  *
 420  * @param ctx
 421  *   Verbs context.
 422  * @param pd
 423  *   Verbs protection domain.
 424  * @param device_attr_ex
 425  *   Extended device attributes to interpret.
 426  *
 427  * @return
 428  *   Usable RSS hash fields mask in Verbs format.
 429  */
 430 static uint64_t
 431 mlx4_hw_rss_sup(struct ibv_context *ctx, struct ibv_pd *pd,
 432                 struct ibv_device_attr_ex *device_attr_ex)
 433 {
 434         uint64_t hw_rss_sup = device_attr_ex->rss_caps.rx_hash_fields_mask;
 435         struct ibv_cq *cq = NULL;
 436         struct ibv_wq *wq = NULL;
 437         struct ibv_rwq_ind_table *ind = NULL;
 438         struct ibv_qp *qp = NULL;
 439
 440         if (!hw_rss_sup) {
 441                 WARN("no RSS capabilities reported; disabling support for UDP"
 442                      " RSS and inner VXLAN RSS");
 443                 return IBV_RX_HASH_SRC_IPV4 | IBV_RX_HASH_DST_IPV4 |
 444                         IBV_RX_HASH_SRC_IPV6 | IBV_RX_HASH_DST_IPV6 |
 445                         IBV_RX_HASH_SRC_PORT_TCP | IBV_RX_HASH_DST_PORT_TCP;
 446         }
 447         if (!(hw_rss_sup & IBV_RX_HASH_INNER))
 448                 return hw_rss_sup;
 449         /*
 450          * Although reported as supported, missing code in some Linux
 451          * versions (v4.15, v4.16) prevents the creation of hash QPs with
 452          * inner capability.
 453          *
 454          * There is no choice but to attempt to instantiate a temporary RSS
 455          * context in order to confirm its support.
 456          */
 457         cq = mlx4_glue->create_cq(ctx, 1, NULL, NULL, 0);
 458         wq = cq ? mlx4_glue->create_wq
 459                 (ctx,
 460                  &(struct ibv_wq_init_attr){
 461                         .wq_type = IBV_WQT_RQ,
 462                         .max_wr = 1,
 463                         .max_sge = 1,
 464                         .pd = pd,
 465                         .cq = cq,
 466                  }) : NULL;
 467         ind = wq ? mlx4_glue->create_rwq_ind_table
 468                 (ctx,
 469                  &(struct ibv_rwq_ind_table_init_attr){
 470                         .log_ind_tbl_size = 0,
 471                         .ind_tbl = &wq,
 472                         .comp_mask = 0,
 473                  }) : NULL;
 474         qp = ind ? mlx4_glue->create_qp_ex
 475                 (ctx,
 476                  &(struct ibv_qp_init_attr_ex){
 477                         .comp_mask =
 478                                 (IBV_QP_INIT_ATTR_PD |
 479                                  IBV_QP_INIT_ATTR_RX_HASH |
 480                                  IBV_QP_INIT_ATTR_IND_TABLE),
 481                         .qp_type = IBV_QPT_RAW_PACKET,
 482                         .pd = pd,
 483                         .rwq_ind_tbl = ind,
 484                         .rx_hash_conf = {
 485                                 .rx_hash_function = IBV_RX_HASH_FUNC_TOEPLITZ,
 486                                 .rx_hash_key_len = MLX4_RSS_HASH_KEY_SIZE,
 487                                 .rx_hash_key = mlx4_rss_hash_key_default,
 488                                 .rx_hash_fields_mask = hw_rss_sup,
 489                         },
 490                  }) : NULL;
 491         if (!qp) {
 492                 WARN("disabling unusable inner RSS capability due to kernel"
 493                      " quirk");
 494                 hw_rss_sup &= ~IBV_RX_HASH_INNER;
 495         } else {
 496                 claim_zero(mlx4_glue->destroy_qp(qp));
 497         }
 498         if (ind)
 499                 claim_zero(mlx4_glue->destroy_rwq_ind_table(ind));
 500         if (wq)
 501                 claim_zero(mlx4_glue->destroy_wq(wq));
 502         if (cq)
 503                 claim_zero(mlx4_glue->destroy_cq(cq));
 504         return hw_rss_sup;
 505 }
 506
 507 static struct rte_pci_driver mlx4_driver;
 508
 509 /**
 510  * DPDK callback to register a PCI device.
 511  *
 512  * This function creates an Ethernet device for each port of a given
 513  * PCI device.
 514  *
 515  * @param[in] pci_drv
 516  *   PCI driver structure (mlx4_driver).
 517  * @param[in] pci_dev
 518  *   PCI device information.
 519  *
 520  * @return
 521  *   0 on success, negative errno value otherwise and rte_errno is set.
 522  */
 523 static int
 524 mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 525 {
 526         struct ibv_device **list;
 527         struct ibv_device *ibv_dev;
 528         int err = 0;
 529         struct ibv_context *attr_ctx = NULL;
 530         struct ibv_device_attr device_attr;
 531         struct ibv_device_attr_ex device_attr_ex;
 532         struct mlx4_conf conf = {
 533                 .ports.present = 0,
 534         };
 535         unsigned int vf;
 536         int i;
 537
 538         (void)pci_drv;
 539         assert(pci_drv == &mlx4_driver);
 540         list = mlx4_glue->get_device_list(&i);
 541         if (list == NULL) {
 542                 rte_errno = errno;
 543                 assert(rte_errno);
 544                 if (rte_errno == ENOSYS)
 545                         ERROR("cannot list devices, is ib_uverbs loaded?");
 546                 return -rte_errno;
 547         }
 548         assert(i >= 0);
 549         /*
 550          * For each listed device, check related sysfs entry against
 551          * the provided PCI ID.
 552          */
 553         while (i != 0) {
 554                 struct rte_pci_addr pci_addr;
 555
 556                 --i;
 557                 DEBUG("checking device \"%s\"", list[i]->name);
 558                 if (mlx4_ibv_device_to_pci_addr(list[i], &pci_addr))
 559                         continue;
 560                 if ((pci_dev->addr.domain != pci_addr.domain) ||
 561                     (pci_dev->addr.bus != pci_addr.bus) ||
 562                     (pci_dev->addr.devid != pci_addr.devid) ||
 563                     (pci_dev->addr.function != pci_addr.function))
 564                         continue;
 565                 vf = (pci_dev->id.device_id ==
 566                       PCI_DEVICE_ID_MELLANOX_CONNECTX3VF);
 567                 INFO("PCI information matches, using device \"%s\" (VF: %s)",
 568                      list[i]->name, (vf ? "true" : "false"));
 569                 attr_ctx = mlx4_glue->open_device(list[i]);
 570                 err = errno;
 571                 break;
 572         }
 573         if (attr_ctx == NULL) {
 574                 mlx4_glue->free_device_list(list);
 575                 switch (err) {
 576                 case 0:
 577                         rte_errno = ENODEV;
 578                         ERROR("cannot access device, is mlx4_ib loaded?");
 579                         return -rte_errno;
 580                 case EINVAL:
 581                         rte_errno = EINVAL;
 582                         ERROR("cannot use device, are drivers up to date?");
 583                         return -rte_errno;
 584                 }
 585                 assert(err > 0);
 586                 rte_errno = err;
 587                 return -rte_errno;
 588         }
 589         ibv_dev = list[i];
 590         DEBUG("device opened");
 591         if (mlx4_glue->query_device(attr_ctx, &device_attr)) {
 592                 rte_errno = ENODEV;
 593                 goto error;
 594         }
 595         INFO("%u port(s) detected", device_attr.phys_port_cnt);
 596         conf.ports.present |= (UINT64_C(1) << device_attr.phys_port_cnt) - 1;
 597         if (mlx4_args(pci_dev->device.devargs, &conf)) {
 598                 ERROR("failed to process device arguments");
 599                 rte_errno = EINVAL;
 600                 goto error;
 601         }
 602         /* Use all ports when none are defined */
 603         if (!conf.ports.enabled)
 604                 conf.ports.enabled = conf.ports.present;
 605         /* Retrieve extended device attributes. */
 606         if (mlx4_glue->query_device_ex(attr_ctx, NULL, &device_attr_ex)) {
 607                 rte_errno = ENODEV;
 608                 goto error;
 609         }
 610         assert(device_attr.max_sge >= MLX4_MAX_SGE);
 611         for (i = 0; i < device_attr.phys_port_cnt; i++) {
 612                 uint32_t port = i + 1; /* ports are indexed from one */
 613                 struct ibv_context *ctx = NULL;
 614                 struct ibv_port_attr port_attr;
 615                 struct ibv_pd *pd = NULL;
 616                 struct priv *priv = NULL;
 617                 struct rte_eth_dev *eth_dev = NULL;
 618                 struct ether_addr mac;
 619
 620                 /* If port is not enabled, skip. */
 621                 if (!(conf.ports.enabled & (1 << i)))
 622                         continue;
 623                 DEBUG("using port %u", port);
 624                 ctx = mlx4_glue->open_device(ibv_dev);
 625                 if (ctx == NULL) {
 626                         rte_errno = ENODEV;
 627                         goto port_error;
 628                 }
 629                 /* Check port status. */
 630                 err = mlx4_glue->query_port(ctx, port, &port_attr);
 631                 if (err) {
 632                         rte_errno = err;
 633                         ERROR("port query failed: %s", strerror(rte_errno));
 634                         goto port_error;
 635                 }
 636                 if (port_attr.link_layer != IBV_LINK_LAYER_ETHERNET) {
 637                         rte_errno = ENOTSUP;
 638                         ERROR("port %d is not configured in Ethernet mode",
 639                               port);
 640                         goto port_error;
 641                 }
 642                 if (port_attr.state != IBV_PORT_ACTIVE)
 643                         DEBUG("port %d is not active: \"%s\" (%d)",
 644                               port, mlx4_glue->port_state_str(port_attr.state),
 645                               port_attr.state);
 646                 /* Make asynchronous FD non-blocking to handle interrupts. */
 647                 if (mlx4_fd_set_non_blocking(ctx->async_fd) < 0) {
 648                         ERROR("cannot make asynchronous FD non-blocking: %s",
 649                               strerror(rte_errno));
 650                         goto port_error;
 651                 }
 652                 /* Allocate protection domain. */
 653                 pd = mlx4_glue->alloc_pd(ctx);
 654                 if (pd == NULL) {
 655                         rte_errno = ENOMEM;
 656                         ERROR("PD allocation failure");
 657                         goto port_error;
 658                 }
 659                 /* from rte_ethdev.c */
 660                 priv = rte_zmalloc("ethdev private structure",
 661                                    sizeof(*priv),
 662                                    RTE_CACHE_LINE_SIZE);
 663                 if (priv == NULL) {
 664                         rte_errno = ENOMEM;
 665                         ERROR("priv allocation failure");
 666                         goto port_error;
 667                 }
 668                 priv->ctx = ctx;
 669                 priv->device_attr = device_attr;
 670                 priv->port = port;
 671                 priv->pd = pd;
 672                 priv->mtu = ETHER_MTU;
 673                 priv->vf = vf;
 674                 priv->hw_csum = !!(device_attr.device_cap_flags &
 675                                    IBV_DEVICE_RAW_IP_CSUM);
 676                 DEBUG("checksum offloading is %ssupported",
 677                       (priv->hw_csum ? "" : "not "));
 678                 /* Only ConnectX-3 Pro supports tunneling. */
 679                 priv->hw_csum_l2tun =
 680                         priv->hw_csum &&
 681                         (device_attr.vendor_part_id ==
 682                          PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO);
 683                 DEBUG("L2 tunnel checksum offloads are %ssupported",
 684                       priv->hw_csum_l2tun ? "" : "not ");
 685                 priv->hw_rss_sup = mlx4_hw_rss_sup(priv->ctx, priv->pd,
 686                                                    &device_attr_ex);
 687                 DEBUG("supported RSS hash fields mask: %016" PRIx64,
 688                       priv->hw_rss_sup);
 689                 priv->hw_fcs_strip = !!(device_attr_ex.raw_packet_caps &
 690                                         IBV_RAW_PACKET_CAP_SCATTER_FCS);
 691                 DEBUG("FCS stripping toggling is %ssupported",
 692                       priv->hw_fcs_strip ? "" : "not ");
 693                 /* Configure the first MAC address by default. */
 694                 if (mlx4_get_mac(priv, &mac.addr_bytes)) {
 695                         ERROR("cannot get MAC address, is mlx4_en loaded?"
 696                               " (rte_errno: %s)", strerror(rte_errno));
 697                         goto port_error;
 698                 }
 699                 INFO("port %u MAC address is %02x:%02x:%02x:%02x:%02x:%02x",
 700                      priv->port,
 701                      mac.addr_bytes[0], mac.addr_bytes[1],
 702                      mac.addr_bytes[2], mac.addr_bytes[3],
 703                      mac.addr_bytes[4], mac.addr_bytes[5]);
 704                 /* Register MAC address. */
 705                 priv->mac[0] = mac;
 706 #ifndef NDEBUG
 707                 {
 708                         char ifname[IF_NAMESIZE];
 709
 710                         if (mlx4_get_ifname(priv, &ifname) == 0)
 711                                 DEBUG("port %u ifname is \"%s\"",
 712                                       priv->port, ifname);
 713                         else
 714                                 DEBUG("port %u ifname is unknown", priv->port);
 715                 }
 716 #endif
 717                 /* Get actual MTU if possible. */
 718                 mlx4_mtu_get(priv, &priv->mtu);
 719                 DEBUG("port %u MTU is %u", priv->port, priv->mtu);
 720                 /* from rte_ethdev.c */
 721                 {
 722                         char name[RTE_ETH_NAME_MAX_LEN];
 723
 724                         snprintf(name, sizeof(name), "%s port %u",
 725                                  mlx4_glue->get_device_name(ibv_dev), port);
 726                         eth_dev = rte_eth_dev_allocate(name);
 727                 }
 728                 if (eth_dev == NULL) {
 729                         ERROR("can not allocate rte ethdev");
 730                         rte_errno = ENOMEM;
 731                         goto port_error;
 732                 }
 733                 eth_dev->data->dev_private = priv;
 734                 eth_dev->data->mac_addrs = priv->mac;
 735                 eth_dev->device = &pci_dev->device;
 736                 rte_eth_copy_pci_info(eth_dev, pci_dev);
 737                 eth_dev->device->driver = &mlx4_driver.driver;
 738                 /* Initialize local interrupt handle for current port. */
 739                 priv->intr_handle = (struct rte_intr_handle){
 740                         .fd = -1,
 741                         .type = RTE_INTR_HANDLE_EXT,
 742                 };
 743                 /*
 744                  * Override ethdev interrupt handle pointer with private
 745                  * handle instead of that of the parent PCI device used by
 746                  * default. This prevents it from being shared between all
 747                  * ports of the same PCI device since each of them is
 748                  * associated its own Verbs context.
 749                  *
 750                  * Rx interrupts in particular require this as the PMD has
 751                  * no control over the registration of queue interrupts
 752                  * besides setting up eth_dev->intr_handle, the rest is
 753                  * handled by rte_intr_rx_ctl().
 754                  */
 755                 eth_dev->intr_handle = &priv->intr_handle;
 756                 priv->dev = eth_dev;
 757                 eth_dev->dev_ops = &mlx4_dev_ops;
 758                 /* Bring Ethernet device up. */
 759                 DEBUG("forcing Ethernet interface up");
 760                 mlx4_dev_set_link_up(priv->dev);
 761                 /* Update link status once if waiting for LSC. */
 762                 if (eth_dev->data->dev_flags & RTE_ETH_DEV_INTR_LSC)
 763                         mlx4_link_update(eth_dev, 0);
 764                 rte_eth_dev_probing_finish(eth_dev);
 765                 continue;
 766 port_error:
 767                 rte_free(priv);
 768                 if (pd)
 769                         claim_zero(mlx4_glue->dealloc_pd(pd));
 770                 if (ctx)
 771                         claim_zero(mlx4_glue->close_device(ctx));
 772                 if (eth_dev)
 773                         rte_eth_dev_release_port(eth_dev);
 774                 break;
 775         }
 776         if (i == device_attr.phys_port_cnt)
 777                 return 0;
 778         /*
 779          * XXX if something went wrong in the loop above, there is a resource
 780          * leak (ctx, pd, priv, dpdk ethdev) but we can do nothing about it as
 781          * long as the dpdk does not provide a way to deallocate a ethdev and a
 782          * way to enumerate the registered ethdevs to free the previous ones.
 783          */
 784 error:
 785         if (attr_ctx)
 786                 claim_zero(mlx4_glue->close_device(attr_ctx));
 787         if (list)
 788                 mlx4_glue->free_device_list(list);
 789         assert(rte_errno >= 0);
 790         return -rte_errno;
 791 }
 792
 793 static const struct rte_pci_id mlx4_pci_id_map[] = {
 794         {
 795                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
 796                                PCI_DEVICE_ID_MELLANOX_CONNECTX3)
 797         },
 798         {
 799                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
 800                                PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO)
 801         },
 802         {
 803                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
 804                                PCI_DEVICE_ID_MELLANOX_CONNECTX3VF)
 805         },
 806         {
 807                 .vendor_id = 0
 808         }
 809 };
 810
 811 static struct rte_pci_driver mlx4_driver = {
 812         .driver = {
 813                 .name = MLX4_DRIVER_NAME
 814         },
 815         .id_table = mlx4_pci_id_map,
 816         .probe = mlx4_pci_probe,
 817         .drv_flags = RTE_PCI_DRV_INTR_LSC |
 818                      RTE_PCI_DRV_INTR_RMV,
 819 };
 820
 821 #ifdef RTE_LIBRTE_MLX4_DLOPEN_DEPS
 822
 823 /**
 824  * Suffix RTE_EAL_PMD_PATH with "-glue".
 825  *
 826  * This function performs a sanity check on RTE_EAL_PMD_PATH before
 827  * suffixing its last component.
 828  *
 829  * @param buf[out]
 830  *   Output buffer, should be large enough otherwise NULL is returned.
 831  * @param size
 832  *   Size of @p out.
 833  *
 834  * @return
 835  *   Pointer to @p buf or @p NULL in case suffix cannot be appended.
 836  */
 837 static char *
 838 mlx4_glue_path(char *buf, size_t size)
 839 {
 840         static const char *const bad[] = { "/", ".", "..", NULL };
 841         const char *path = RTE_EAL_PMD_PATH;
 842         size_t len = strlen(path);
 843         size_t off;
 844         int i;
 845
 846         while (len && path[len - 1] == '/')
 847                 --len;
 848         for (off = len; off && path[off - 1] != '/'; --off)
 849                 ;
 850         for (i = 0; bad[i]; ++i)
 851                 if (!strncmp(path + off, bad[i], (int)(len - off)))
 852                         goto error;
 853         i = snprintf(buf, size, "%.*s-glue", (int)len, path);
 854         if (i == -1 || (size_t)i >= size)
 855                 goto error;
 856         return buf;
 857 error:
 858         ERROR("unable to append \"-glue\" to last component of"
 859               " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"),"
 860               " please re-configure DPDK");
 861         return NULL;
 862 }
 863
 864 /**
 865  * Initialization routine for run-time dependency on rdma-core.
 866  */
 867 static int
 868 mlx4_glue_init(void)
 869 {
 870         char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
 871         const char *path[] = {
 872                 /*
 873                  * A basic security check is necessary before trusting
 874                  * MLX4_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
 875                  */
 876                 (geteuid() == getuid() && getegid() == getgid() ?
 877                  getenv("MLX4_GLUE_PATH") : NULL),
 878                 /*
 879                  * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
 880                  * variant, otherwise let dlopen() look up libraries on its
 881                  * own.
 882                  */
 883                 (*RTE_EAL_PMD_PATH ?
 884                  mlx4_glue_path(glue_path, sizeof(glue_path)) : ""),
 885         };
 886         unsigned int i = 0;
 887         void *handle = NULL;
 888         void **sym;
 889         const char *dlmsg;
 890
 891         while (!handle && i != RTE_DIM(path)) {
 892                 const char *end;
 893                 size_t len;
 894                 int ret;
 895
 896                 if (!path[i]) {
 897                         ++i;
 898                         continue;
 899                 }
 900                 end = strpbrk(path[i], ":;");
 901                 if (!end)
 902                         end = path[i] + strlen(path[i]);
 903                 len = end - path[i];
 904                 ret = 0;
 905                 do {
 906                         char name[ret + 1];
 907
 908                         ret = snprintf(name, sizeof(name), "%.*s%s" MLX4_GLUE,
 909                                        (int)len, path[i],
 910                                        (!len || *(end - 1) == '/') ? "" : "/");
 911                         if (ret == -1)
 912                                 break;
 913                         if (sizeof(name) != (size_t)ret + 1)
 914                                 continue;
 915                         DEBUG("looking for rdma-core glue as \"%s\"", name);
 916                         handle = dlopen(name, RTLD_LAZY);
 917                         break;
 918                 } while (1);
 919                 path[i] = end + 1;
 920                 if (!*end)
 921                         ++i;
 922         }
 923         if (!handle) {
 924                 rte_errno = EINVAL;
 925                 dlmsg = dlerror();
 926                 if (dlmsg)
 927                         WARN("cannot load glue library: %s", dlmsg);
 928                 goto glue_error;
 929         }
 930         sym = dlsym(handle, "mlx4_glue");
 931         if (!sym || !*sym) {
 932                 rte_errno = EINVAL;
 933                 dlmsg = dlerror();
 934                 if (dlmsg)
 935                         ERROR("cannot resolve glue symbol: %s", dlmsg);
 936                 goto glue_error;
 937         }
 938         mlx4_glue = *sym;
 939         return 0;
 940 glue_error:
 941         if (handle)
 942                 dlclose(handle);
 943         WARN("cannot initialize PMD due to missing run-time"
 944              " dependency on rdma-core libraries (libibverbs,"
 945              " libmlx4)");
 946         return -rte_errno;
 947 }
 948
 949 #endif
 950
 951 /**
 952  * Driver initialization routine.
 953  */
 954 RTE_INIT(rte_mlx4_pmd_init);
 955 static void
 956 rte_mlx4_pmd_init(void)
 957 {
 958         /*
 959          * MLX4_DEVICE_FATAL_CLEANUP tells ibv_destroy functions we
 960          * want to get success errno value in case of calling them
 961          * when the device was removed.
 962          */
 963         setenv("MLX4_DEVICE_FATAL_CLEANUP", "1", 1);
 964         /*
 965          * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
 966          * huge pages. Calling ibv_fork_init() during init allows
 967          * applications to use fork() safely for purposes other than
 968          * using this PMD, which is not supported in forked processes.
 969          */
 970         setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
 971 #ifdef RTE_LIBRTE_MLX4_DLOPEN_DEPS
 972         if (mlx4_glue_init())
 973                 return;
 974         assert(mlx4_glue);
 975 #endif
 976 #ifndef NDEBUG
 977         /* Glue structure must not contain any NULL pointers. */
 978         {
 979                 unsigned int i;
 980
 981                 for (i = 0; i != sizeof(*mlx4_glue) / sizeof(void *); ++i)
 982                         assert(((const void *const *)mlx4_glue)[i]);
 983         }
 984 #endif
 985         if (strcmp(mlx4_glue->version, MLX4_GLUE_VERSION)) {
 986                 ERROR("rdma-core glue \"%s\" mismatch: \"%s\" is required",
 987                       mlx4_glue->version, MLX4_GLUE_VERSION);
 988                 return;
 989         }
 990         mlx4_glue->fork_init();
 991         rte_pci_register(&mlx4_driver);
 992         rte_mem_event_callback_register("MLX4_MEM_EVENT_CB",
 993                                         mlx4_mr_mem_event_cb, NULL);
 994 }
 995
 996 RTE_PMD_EXPORT_NAME(net_mlx4, __COUNTER__);
 997 RTE_PMD_REGISTER_PCI_TABLE(net_mlx4, mlx4_pci_id_map);
 998 RTE_PMD_REGISTER_KMOD_DEP(net_mlx4,
 999         "* ib_uverbs & mlx4_en & mlx4_core & mlx4_ib");