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 exit:
 102         return ret;
 103 }
 104
 105 /**
 106  * DPDK callback to start the device.
 107  *
 108  * Simulate device start by initializing common RSS resources and attaching
 109  * all configured flows.
 110  *
 111  * @param dev
 112  *   Pointer to Ethernet device structure.
 113  *
 114  * @return
 115  *   0 on success, negative errno value otherwise and rte_errno is set.
 116  */
 117 static int
 118 mlx4_dev_start(struct rte_eth_dev *dev)
 119 {
 120         struct priv *priv = dev->data->dev_private;
 121         struct rte_flow_error error;
 122         int ret;
 123
 124         if (priv->started)
 125                 return 0;
 126         DEBUG("%p: attaching configured flows to all RX queues", (void *)dev);
 127         priv->started = 1;
 128         ret = mlx4_rss_init(priv);
 129         if (ret) {
 130                 ERROR("%p: cannot initialize RSS resources: %s",
 131                       (void *)dev, strerror(-ret));
 132                 goto err;
 133         }
 134 #ifndef NDEBUG
 135         mlx4_mr_dump_dev(dev);
 136 #endif
 137         ret = mlx4_rxq_intr_enable(priv);
 138         if (ret) {
 139                 ERROR("%p: interrupt handler installation failed",
 140                      (void *)dev);
 141                 goto err;
 142         }
 143         ret = mlx4_flow_sync(priv, &error);
 144         if (ret) {
 145                 ERROR("%p: cannot attach flow rules (code %d, \"%s\"),"
 146                       " flow error type %d, cause %p, message: %s",
 147                       (void *)dev,
 148                       -ret, strerror(-ret), error.type, error.cause,
 149                       error.message ? error.message : "(unspecified)");
 150                 goto err;
 151         }
 152         rte_wmb();
 153         dev->tx_pkt_burst = mlx4_tx_burst;
 154         dev->rx_pkt_burst = mlx4_rx_burst;
 155         return 0;
 156 err:
 157         mlx4_dev_stop(dev);
 158         return ret;
 159 }
 160
 161 /**
 162  * DPDK callback to stop the device.
 163  *
 164  * Simulate device stop by detaching all configured flows.
 165  *
 166  * @param dev
 167  *   Pointer to Ethernet device structure.
 168  */
 169 static void
 170 mlx4_dev_stop(struct rte_eth_dev *dev)
 171 {
 172         struct priv *priv = dev->data->dev_private;
 173
 174         if (!priv->started)
 175                 return;
 176         DEBUG("%p: detaching flows from all RX queues", (void *)dev);
 177         priv->started = 0;
 178         dev->tx_pkt_burst = mlx4_tx_burst_removed;
 179         dev->rx_pkt_burst = mlx4_rx_burst_removed;
 180         rte_wmb();
 181         mlx4_flow_sync(priv, NULL);
 182         mlx4_rxq_intr_disable(priv);
 183         mlx4_rss_deinit(priv);
 184 }
 185
 186 /**
 187  * DPDK callback to close the device.
 188  *
 189  * Destroy all queues and objects, free memory.
 190  *
 191  * @param dev
 192  *   Pointer to Ethernet device structure.
 193  */
 194 static void
 195 mlx4_dev_close(struct rte_eth_dev *dev)
 196 {
 197         struct priv *priv = dev->data->dev_private;
 198         unsigned int i;
 199
 200         DEBUG("%p: closing device \"%s\"",
 201               (void *)dev,
 202               ((priv->ctx != NULL) ? priv->ctx->device->name : ""));
 203         dev->rx_pkt_burst = mlx4_rx_burst_removed;
 204         dev->tx_pkt_burst = mlx4_tx_burst_removed;
 205         rte_wmb();
 206         mlx4_flow_clean(priv);
 207         mlx4_rss_deinit(priv);
 208         for (i = 0; i != dev->data->nb_rx_queues; ++i)
 209                 mlx4_rx_queue_release(dev->data->rx_queues[i]);
 210         for (i = 0; i != dev->data->nb_tx_queues; ++i)
 211                 mlx4_tx_queue_release(dev->data->tx_queues[i]);
 212         mlx4_mr_release(dev);
 213         if (priv->pd != NULL) {
 214                 assert(priv->ctx != NULL);
 215                 claim_zero(mlx4_glue->dealloc_pd(priv->pd));
 216                 claim_zero(mlx4_glue->close_device(priv->ctx));
 217         } else
 218                 assert(priv->ctx == NULL);
 219         mlx4_intr_uninstall(priv);
 220         memset(priv, 0, sizeof(*priv));
 221 }
 222
 223 static const struct eth_dev_ops mlx4_dev_ops = {
 224         .dev_configure = mlx4_dev_configure,
 225         .dev_start = mlx4_dev_start,
 226         .dev_stop = mlx4_dev_stop,
 227         .dev_set_link_down = mlx4_dev_set_link_down,
 228         .dev_set_link_up = mlx4_dev_set_link_up,
 229         .dev_close = mlx4_dev_close,
 230         .link_update = mlx4_link_update,
 231         .promiscuous_enable = mlx4_promiscuous_enable,
 232         .promiscuous_disable = mlx4_promiscuous_disable,
 233         .allmulticast_enable = mlx4_allmulticast_enable,
 234         .allmulticast_disable = mlx4_allmulticast_disable,
 235         .mac_addr_remove = mlx4_mac_addr_remove,
 236         .mac_addr_add = mlx4_mac_addr_add,
 237         .mac_addr_set = mlx4_mac_addr_set,
 238         .stats_get = mlx4_stats_get,
 239         .stats_reset = mlx4_stats_reset,
 240         .fw_version_get = mlx4_fw_version_get,
 241         .dev_infos_get = mlx4_dev_infos_get,
 242         .dev_supported_ptypes_get = mlx4_dev_supported_ptypes_get,
 243         .vlan_filter_set = mlx4_vlan_filter_set,
 244         .rx_queue_setup = mlx4_rx_queue_setup,
 245         .tx_queue_setup = mlx4_tx_queue_setup,
 246         .rx_queue_release = mlx4_rx_queue_release,
 247         .tx_queue_release = mlx4_tx_queue_release,
 248         .flow_ctrl_get = mlx4_flow_ctrl_get,
 249         .flow_ctrl_set = mlx4_flow_ctrl_set,
 250         .mtu_set = mlx4_mtu_set,
 251         .filter_ctrl = mlx4_filter_ctrl,
 252         .rx_queue_intr_enable = mlx4_rx_intr_enable,
 253         .rx_queue_intr_disable = mlx4_rx_intr_disable,
 254         .is_removed = mlx4_is_removed,
 255 };
 256
 257 /**
 258  * Get PCI information from struct ibv_device.
 259  *
 260  * @param device
 261  *   Pointer to Ethernet device structure.
 262  * @param[out] pci_addr
 263  *   PCI bus address output buffer.
 264  *
 265  * @return
 266  *   0 on success, negative errno value otherwise and rte_errno is set.
 267  */
 268 static int
 269 mlx4_ibv_device_to_pci_addr(const struct ibv_device *device,
 270                             struct rte_pci_addr *pci_addr)
 271 {
 272         FILE *file;
 273         char line[32];
 274         MKSTR(path, "%s/device/uevent", device->ibdev_path);
 275
 276         file = fopen(path, "rb");
 277         if (file == NULL) {
 278                 rte_errno = errno;
 279                 return -rte_errno;
 280         }
 281         while (fgets(line, sizeof(line), file) == line) {
 282                 size_t len = strlen(line);
 283                 int ret;
 284
 285                 /* Truncate long lines. */
 286                 if (len == (sizeof(line) - 1))
 287                         while (line[(len - 1)] != '\n') {
 288                                 ret = fgetc(file);
 289                                 if (ret == EOF)
 290                                         break;
 291                                 line[(len - 1)] = ret;
 292                         }
 293                 /* Extract information. */
 294                 if (sscanf(line,
 295                            "PCI_SLOT_NAME="
 296                            "%" SCNx32 ":%" SCNx8 ":%" SCNx8 ".%" SCNx8 "\n",
 297                            &pci_addr->domain,
 298                            &pci_addr->bus,
 299                            &pci_addr->devid,
 300                            &pci_addr->function) == 4) {
 301                         ret = 0;
 302                         break;
 303                 }
 304         }
 305         fclose(file);
 306         return 0;
 307 }
 308
 309 /**
 310  * Verify and store value for device argument.
 311  *
 312  * @param[in] key
 313  *   Key argument to verify.
 314  * @param[in] val
 315  *   Value associated with key.
 316  * @param[in, out] conf
 317  *   Shared configuration data.
 318  *
 319  * @return
 320  *   0 on success, negative errno value otherwise and rte_errno is set.
 321  */
 322 static int
 323 mlx4_arg_parse(const char *key, const char *val, struct mlx4_conf *conf)
 324 {
 325         unsigned long tmp;
 326
 327         errno = 0;
 328         tmp = strtoul(val, NULL, 0);
 329         if (errno) {
 330                 rte_errno = errno;
 331                 WARN("%s: \"%s\" is not a valid integer", key, val);
 332                 return -rte_errno;
 333         }
 334         if (strcmp(MLX4_PMD_PORT_KVARG, key) == 0) {
 335                 uint32_t ports = rte_log2_u32(conf->ports.present + 1);
 336
 337                 if (tmp >= ports) {
 338                         ERROR("port index %lu outside range [0,%" PRIu32 ")",
 339                               tmp, ports);
 340                         return -EINVAL;
 341                 }
 342                 if (!(conf->ports.present & (1 << tmp))) {
 343                         rte_errno = EINVAL;
 344                         ERROR("invalid port index %lu", tmp);
 345                         return -rte_errno;
 346                 }
 347                 conf->ports.enabled |= 1 << tmp;
 348         } else {
 349                 rte_errno = EINVAL;
 350                 WARN("%s: unknown parameter", key);
 351                 return -rte_errno;
 352         }
 353         return 0;
 354 }
 355
 356 /**
 357  * Parse device parameters.
 358  *
 359  * @param devargs
 360  *   Device arguments structure.
 361  *
 362  * @return
 363  *   0 on success, negative errno value otherwise and rte_errno is set.
 364  */
 365 static int
 366 mlx4_args(struct rte_devargs *devargs, struct mlx4_conf *conf)
 367 {
 368         struct rte_kvargs *kvlist;
 369         unsigned int arg_count;
 370         int ret = 0;
 371         int i;
 372
 373         if (devargs == NULL)
 374                 return 0;
 375         kvlist = rte_kvargs_parse(devargs->args, pmd_mlx4_init_params);
 376         if (kvlist == NULL) {
 377                 rte_errno = EINVAL;
 378                 ERROR("failed to parse kvargs");
 379                 return -rte_errno;
 380         }
 381         /* Process parameters. */
 382         for (i = 0; pmd_mlx4_init_params[i]; ++i) {
 383                 arg_count = rte_kvargs_count(kvlist, MLX4_PMD_PORT_KVARG);
 384                 while (arg_count-- > 0) {
 385                         ret = rte_kvargs_process(kvlist,
 386                                                  MLX4_PMD_PORT_KVARG,
 387                                                  (int (*)(const char *,
 388                                                           const char *,
 389                                                           void *))
 390                                                  mlx4_arg_parse,
 391                                                  conf);
 392                         if (ret != 0)
 393                                 goto free_kvlist;
 394                 }
 395         }
 396 free_kvlist:
 397         rte_kvargs_free(kvlist);
 398         return ret;
 399 }
 400
 401 /**
 402  * Interpret RSS capabilities reported by device.
 403  *
 404  * This function returns the set of usable Verbs RSS hash fields, kernel
 405  * quirks taken into account.
 406  *
 407  * @param ctx
 408  *   Verbs context.
 409  * @param pd
 410  *   Verbs protection domain.
 411  * @param device_attr_ex
 412  *   Extended device attributes to interpret.
 413  *
 414  * @return
 415  *   Usable RSS hash fields mask in Verbs format.
 416  */
 417 static uint64_t
 418 mlx4_hw_rss_sup(struct ibv_context *ctx, struct ibv_pd *pd,
 419                 struct ibv_device_attr_ex *device_attr_ex)
 420 {
 421         uint64_t hw_rss_sup = device_attr_ex->rss_caps.rx_hash_fields_mask;
 422         struct ibv_cq *cq = NULL;
 423         struct ibv_wq *wq = NULL;
 424         struct ibv_rwq_ind_table *ind = NULL;
 425         struct ibv_qp *qp = NULL;
 426
 427         if (!hw_rss_sup) {
 428                 WARN("no RSS capabilities reported; disabling support for UDP"
 429                      " RSS and inner VXLAN RSS");
 430                 return IBV_RX_HASH_SRC_IPV4 | IBV_RX_HASH_DST_IPV4 |
 431                         IBV_RX_HASH_SRC_IPV6 | IBV_RX_HASH_DST_IPV6 |
 432                         IBV_RX_HASH_SRC_PORT_TCP | IBV_RX_HASH_DST_PORT_TCP;
 433         }
 434         if (!(hw_rss_sup & IBV_RX_HASH_INNER))
 435                 return hw_rss_sup;
 436         /*
 437          * Although reported as supported, missing code in some Linux
 438          * versions (v4.15, v4.16) prevents the creation of hash QPs with
 439          * inner capability.
 440          *
 441          * There is no choice but to attempt to instantiate a temporary RSS
 442          * context in order to confirm its support.
 443          */
 444         cq = mlx4_glue->create_cq(ctx, 1, NULL, NULL, 0);
 445         wq = cq ? mlx4_glue->create_wq
 446                 (ctx,
 447                  &(struct ibv_wq_init_attr){
 448                         .wq_type = IBV_WQT_RQ,
 449                         .max_wr = 1,
 450                         .max_sge = 1,
 451                         .pd = pd,
 452                         .cq = cq,
 453                  }) : NULL;
 454         ind = wq ? mlx4_glue->create_rwq_ind_table
 455                 (ctx,
 456                  &(struct ibv_rwq_ind_table_init_attr){
 457                         .log_ind_tbl_size = 0,
 458                         .ind_tbl = &wq,
 459                         .comp_mask = 0,
 460                  }) : NULL;
 461         qp = ind ? mlx4_glue->create_qp_ex
 462                 (ctx,
 463                  &(struct ibv_qp_init_attr_ex){
 464                         .comp_mask =
 465                                 (IBV_QP_INIT_ATTR_PD |
 466                                  IBV_QP_INIT_ATTR_RX_HASH |
 467                                  IBV_QP_INIT_ATTR_IND_TABLE),
 468                         .qp_type = IBV_QPT_RAW_PACKET,
 469                         .pd = pd,
 470                         .rwq_ind_tbl = ind,
 471                         .rx_hash_conf = {
 472                                 .rx_hash_function = IBV_RX_HASH_FUNC_TOEPLITZ,
 473                                 .rx_hash_key_len = MLX4_RSS_HASH_KEY_SIZE,
 474                                 .rx_hash_key = mlx4_rss_hash_key_default,
 475                                 .rx_hash_fields_mask = hw_rss_sup,
 476                         },
 477                  }) : NULL;
 478         if (!qp) {
 479                 WARN("disabling unusable inner RSS capability due to kernel"
 480                      " quirk");
 481                 hw_rss_sup &= ~IBV_RX_HASH_INNER;
 482         } else {
 483                 claim_zero(mlx4_glue->destroy_qp(qp));
 484         }
 485         if (ind)
 486                 claim_zero(mlx4_glue->destroy_rwq_ind_table(ind));
 487         if (wq)
 488                 claim_zero(mlx4_glue->destroy_wq(wq));
 489         if (cq)
 490                 claim_zero(mlx4_glue->destroy_cq(cq));
 491         return hw_rss_sup;
 492 }
 493
 494 static struct rte_pci_driver mlx4_driver;
 495
 496 /**
 497  * DPDK callback to register a PCI device.
 498  *
 499  * This function creates an Ethernet device for each port of a given
 500  * PCI device.
 501  *
 502  * @param[in] pci_drv
 503  *   PCI driver structure (mlx4_driver).
 504  * @param[in] pci_dev
 505  *   PCI device information.
 506  *
 507  * @return
 508  *   0 on success, negative errno value otherwise and rte_errno is set.
 509  */
 510 static int
 511 mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 512 {
 513         struct ibv_device **list;
 514         struct ibv_device *ibv_dev;
 515         int err = 0;
 516         struct ibv_context *attr_ctx = NULL;
 517         struct ibv_device_attr device_attr;
 518         struct ibv_device_attr_ex device_attr_ex;
 519         struct mlx4_conf conf = {
 520                 .ports.present = 0,
 521         };
 522         unsigned int vf;
 523         int i;
 524
 525         (void)pci_drv;
 526         assert(pci_drv == &mlx4_driver);
 527         list = mlx4_glue->get_device_list(&i);
 528         if (list == NULL) {
 529                 rte_errno = errno;
 530                 assert(rte_errno);
 531                 if (rte_errno == ENOSYS)
 532                         ERROR("cannot list devices, is ib_uverbs loaded?");
 533                 return -rte_errno;
 534         }
 535         assert(i >= 0);
 536         /*
 537          * For each listed device, check related sysfs entry against
 538          * the provided PCI ID.
 539          */
 540         while (i != 0) {
 541                 struct rte_pci_addr pci_addr;
 542
 543                 --i;
 544                 DEBUG("checking device \"%s\"", list[i]->name);
 545                 if (mlx4_ibv_device_to_pci_addr(list[i], &pci_addr))
 546                         continue;
 547                 if ((pci_dev->addr.domain != pci_addr.domain) ||
 548                     (pci_dev->addr.bus != pci_addr.bus) ||
 549                     (pci_dev->addr.devid != pci_addr.devid) ||
 550                     (pci_dev->addr.function != pci_addr.function))
 551                         continue;
 552                 vf = (pci_dev->id.device_id ==
 553                       PCI_DEVICE_ID_MELLANOX_CONNECTX3VF);
 554                 INFO("PCI information matches, using device \"%s\" (VF: %s)",
 555                      list[i]->name, (vf ? "true" : "false"));
 556                 attr_ctx = mlx4_glue->open_device(list[i]);
 557                 err = errno;
 558                 break;
 559         }
 560         if (attr_ctx == NULL) {
 561                 mlx4_glue->free_device_list(list);
 562                 switch (err) {
 563                 case 0:
 564                         rte_errno = ENODEV;
 565                         ERROR("cannot access device, is mlx4_ib loaded?");
 566                         return -rte_errno;
 567                 case EINVAL:
 568                         rte_errno = EINVAL;
 569                         ERROR("cannot use device, are drivers up to date?");
 570                         return -rte_errno;
 571                 }
 572                 assert(err > 0);
 573                 rte_errno = err;
 574                 return -rte_errno;
 575         }
 576         ibv_dev = list[i];
 577         DEBUG("device opened");
 578         if (mlx4_glue->query_device(attr_ctx, &device_attr)) {
 579                 err = ENODEV;
 580                 goto error;
 581         }
 582         INFO("%u port(s) detected", device_attr.phys_port_cnt);
 583         conf.ports.present |= (UINT64_C(1) << device_attr.phys_port_cnt) - 1;
 584         if (mlx4_args(pci_dev->device.devargs, &conf)) {
 585                 ERROR("failed to process device arguments");
 586                 err = EINVAL;
 587                 goto error;
 588         }
 589         /* Use all ports when none are defined */
 590         if (!conf.ports.enabled)
 591                 conf.ports.enabled = conf.ports.present;
 592         /* Retrieve extended device attributes. */
 593         if (mlx4_glue->query_device_ex(attr_ctx, NULL, &device_attr_ex)) {
 594                 err = ENODEV;
 595                 goto error;
 596         }
 597         assert(device_attr.max_sge >= MLX4_MAX_SGE);
 598         for (i = 0; i < device_attr.phys_port_cnt; i++) {
 599                 uint32_t port = i + 1; /* ports are indexed from one */
 600                 struct ibv_context *ctx = NULL;
 601                 struct ibv_port_attr port_attr;
 602                 struct ibv_pd *pd = NULL;
 603                 struct priv *priv = NULL;
 604                 struct rte_eth_dev *eth_dev = NULL;
 605                 struct ether_addr mac;
 606
 607                 /* If port is not enabled, skip. */
 608                 if (!(conf.ports.enabled & (1 << i)))
 609                         continue;
 610                 DEBUG("using port %u", port);
 611                 ctx = mlx4_glue->open_device(ibv_dev);
 612                 if (ctx == NULL) {
 613                         err = ENODEV;
 614                         goto port_error;
 615                 }
 616                 /* Check port status. */
 617                 err = mlx4_glue->query_port(ctx, port, &port_attr);
 618                 if (err) {
 619                         err = ENODEV;
 620                         ERROR("port query failed: %s", strerror(err));
 621                         goto port_error;
 622                 }
 623                 if (port_attr.link_layer != IBV_LINK_LAYER_ETHERNET) {
 624                         err = ENOTSUP;
 625                         ERROR("port %d is not configured in Ethernet mode",
 626                               port);
 627                         goto port_error;
 628                 }
 629                 if (port_attr.state != IBV_PORT_ACTIVE)
 630                         DEBUG("port %d is not active: \"%s\" (%d)",
 631                               port, mlx4_glue->port_state_str(port_attr.state),
 632                               port_attr.state);
 633                 /* Make asynchronous FD non-blocking to handle interrupts. */
 634                 err = mlx4_fd_set_non_blocking(ctx->async_fd);
 635                 if (err) {
 636                         ERROR("cannot make asynchronous FD non-blocking: %s",
 637                               strerror(err));
 638                         goto port_error;
 639                 }
 640                 /* Allocate protection domain. */
 641                 pd = mlx4_glue->alloc_pd(ctx);
 642                 if (pd == NULL) {
 643                         err = ENOMEM;
 644                         ERROR("PD allocation failure");
 645                         goto port_error;
 646                 }
 647                 /* from rte_ethdev.c */
 648                 priv = rte_zmalloc("ethdev private structure",
 649                                    sizeof(*priv),
 650                                    RTE_CACHE_LINE_SIZE);
 651                 if (priv == NULL) {
 652                         err = ENOMEM;
 653                         ERROR("priv allocation failure");
 654                         goto port_error;
 655                 }
 656                 priv->ctx = ctx;
 657                 priv->device_attr = device_attr;
 658                 priv->port = port;
 659                 priv->pd = pd;
 660                 priv->mtu = ETHER_MTU;
 661                 priv->vf = vf;
 662                 priv->hw_csum = !!(device_attr.device_cap_flags &
 663                                    IBV_DEVICE_RAW_IP_CSUM);
 664                 DEBUG("checksum offloading is %ssupported",
 665                       (priv->hw_csum ? "" : "not "));
 666                 /* Only ConnectX-3 Pro supports tunneling. */
 667                 priv->hw_csum_l2tun =
 668                         priv->hw_csum &&
 669                         (device_attr.vendor_part_id ==
 670                          PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO);
 671                 DEBUG("L2 tunnel checksum offloads are %ssupported",
 672                       priv->hw_csum_l2tun ? "" : "not ");
 673                 priv->hw_rss_sup = mlx4_hw_rss_sup(priv->ctx, priv->pd,
 674                                                    &device_attr_ex);
 675                 DEBUG("supported RSS hash fields mask: %016" PRIx64,
 676                       priv->hw_rss_sup);
 677                 priv->hw_rss_max_qps =
 678                         device_attr_ex.rss_caps.max_rwq_indirection_table_size;
 679                 DEBUG("MAX RSS queues %d", priv->hw_rss_max_qps);
 680                 priv->hw_fcs_strip = !!(device_attr_ex.raw_packet_caps &
 681                                         IBV_RAW_PACKET_CAP_SCATTER_FCS);
 682                 DEBUG("FCS stripping toggling is %ssupported",
 683                       priv->hw_fcs_strip ? "" : "not ");
 684                 priv->tso =
 685                         ((device_attr_ex.tso_caps.max_tso > 0) &&
 686                          (device_attr_ex.tso_caps.supported_qpts &
 687                           (1 << IBV_QPT_RAW_PACKET)));
 688                 if (priv->tso)
 689                         priv->tso_max_payload_sz =
 690                                         device_attr_ex.tso_caps.max_tso;
 691                 DEBUG("TSO is %ssupported",
 692                       priv->tso ? "" : "not ");
 693                 /* Configure the first MAC address by default. */
 694                 err = mlx4_get_mac(priv, &mac.addr_bytes);
 695                 if (err) {
 696                         ERROR("cannot get MAC address, is mlx4_en loaded?"
 697                               " (error: %s)", strerror(err));
 698                         goto port_error;
 699                 }
 700                 INFO("port %u MAC address is %02x:%02x:%02x:%02x:%02x:%02x",
 701                      priv->port,
 702                      mac.addr_bytes[0], mac.addr_bytes[1],
 703                      mac.addr_bytes[2], mac.addr_bytes[3],
 704                      mac.addr_bytes[4], mac.addr_bytes[5]);
 705                 /* Register MAC address. */
 706                 priv->mac[0] = mac;
 707 #ifndef NDEBUG
 708                 {
 709                         char ifname[IF_NAMESIZE];
 710
 711                         if (mlx4_get_ifname(priv, &ifname) == 0)
 712                                 DEBUG("port %u ifname is \"%s\"",
 713                                       priv->port, ifname);
 714                         else
 715                                 DEBUG("port %u ifname is unknown", priv->port);
 716                 }
 717 #endif
 718                 /* Get actual MTU if possible. */
 719                 mlx4_mtu_get(priv, &priv->mtu);
 720                 DEBUG("port %u MTU is %u", priv->port, priv->mtu);
 721                 /* from rte_ethdev.c */
 722                 {
 723                         char name[RTE_ETH_NAME_MAX_LEN];
 724
 725                         snprintf(name, sizeof(name), "%s port %u",
 726                                  mlx4_glue->get_device_name(ibv_dev), port);
 727                         eth_dev = rte_eth_dev_allocate(name);
 728                 }
 729                 if (eth_dev == NULL) {
 730                         err = ENOMEM;
 731                         ERROR("can not allocate rte ethdev");
 732                         goto port_error;
 733                 }
 734                 eth_dev->data->dev_private = priv;
 735                 eth_dev->data->mac_addrs = priv->mac;
 736                 eth_dev->device = &pci_dev->device;
 737                 rte_eth_copy_pci_info(eth_dev, pci_dev);
 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                 /*
 765                  * Once the device is added to the list of memory event
 766                  * callback, its global MR cache table cannot be expanded
 767                  * on the fly because of deadlock. If it overflows, lookup
 768                  * should be done by searching MR list linearly, which is slow.
 769                  */
 770                 err = mlx4_mr_btree_init(&priv->mr.cache,
 771                                          MLX4_MR_BTREE_CACHE_N * 2,
 772                                          eth_dev->device->numa_node);
 773                 if (err) {
 774                         /* rte_errno is already set. */
 775                         goto port_error;
 776                 }
 777                 /* Add device to memory callback list. */
 778                 rte_rwlock_write_lock(&mlx4_mem_event_rwlock);
 779                 LIST_INSERT_HEAD(&mlx4_mem_event_cb_list, priv, mem_event_cb);
 780                 rte_rwlock_write_unlock(&mlx4_mem_event_rwlock);
 781                 rte_eth_dev_probing_finish(eth_dev);
 782                 continue;
 783 port_error:
 784                 rte_free(priv);
 785                 if (eth_dev != NULL)
 786                         eth_dev->data->dev_private = NULL;
 787                 if (pd)
 788                         claim_zero(mlx4_glue->dealloc_pd(pd));
 789                 if (ctx)
 790                         claim_zero(mlx4_glue->close_device(ctx));
 791                 if (eth_dev != NULL) {
 792                         /* mac_addrs must not be freed because part of dev_private */
 793                         eth_dev->data->mac_addrs = NULL;
 794                         rte_eth_dev_release_port(eth_dev);
 795                 }
 796                 break;
 797         }
 798         /*
 799          * XXX if something went wrong in the loop above, there is a resource
 800          * leak (ctx, pd, priv, dpdk ethdev) but we can do nothing about it as
 801          * long as the dpdk does not provide a way to deallocate a ethdev and a
 802          * way to enumerate the registered ethdevs to free the previous ones.
 803          */
 804 error:
 805         if (attr_ctx)
 806                 claim_zero(mlx4_glue->close_device(attr_ctx));
 807         if (list)
 808                 mlx4_glue->free_device_list(list);
 809         if (err)
 810                 rte_errno = err;
 811         return -err;
 812 }
 813
 814 static const struct rte_pci_id mlx4_pci_id_map[] = {
 815         {
 816                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
 817                                PCI_DEVICE_ID_MELLANOX_CONNECTX3)
 818         },
 819         {
 820                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
 821                                PCI_DEVICE_ID_MELLANOX_CONNECTX3PRO)
 822         },
 823         {
 824                 RTE_PCI_DEVICE(PCI_VENDOR_ID_MELLANOX,
 825                                PCI_DEVICE_ID_MELLANOX_CONNECTX3VF)
 826         },
 827         {
 828                 .vendor_id = 0
 829         }
 830 };
 831
 832 static struct rte_pci_driver mlx4_driver = {
 833         .driver = {
 834                 .name = MLX4_DRIVER_NAME
 835         },
 836         .id_table = mlx4_pci_id_map,
 837         .probe = mlx4_pci_probe,
 838         .drv_flags = RTE_PCI_DRV_INTR_LSC |
 839                      RTE_PCI_DRV_INTR_RMV,
 840 };
 841
 842 #ifdef RTE_IBVERBS_LINK_DLOPEN
 843
 844 /**
 845  * Suffix RTE_EAL_PMD_PATH with "-glue".
 846  *
 847  * This function performs a sanity check on RTE_EAL_PMD_PATH before
 848  * suffixing its last component.
 849  *
 850  * @param buf[out]
 851  *   Output buffer, should be large enough otherwise NULL is returned.
 852  * @param size
 853  *   Size of @p out.
 854  *
 855  * @return
 856  *   Pointer to @p buf or @p NULL in case suffix cannot be appended.
 857  */
 858 static char *
 859 mlx4_glue_path(char *buf, size_t size)
 860 {
 861         static const char *const bad[] = { "/", ".", "..", NULL };
 862         const char *path = RTE_EAL_PMD_PATH;
 863         size_t len = strlen(path);
 864         size_t off;
 865         int i;
 866
 867         while (len && path[len - 1] == '/')
 868                 --len;
 869         for (off = len; off && path[off - 1] != '/'; --off)
 870                 ;
 871         for (i = 0; bad[i]; ++i)
 872                 if (!strncmp(path + off, bad[i], (int)(len - off)))
 873                         goto error;
 874         i = snprintf(buf, size, "%.*s-glue", (int)len, path);
 875         if (i == -1 || (size_t)i >= size)
 876                 goto error;
 877         return buf;
 878 error:
 879         ERROR("unable to append \"-glue\" to last component of"
 880               " RTE_EAL_PMD_PATH (\"" RTE_EAL_PMD_PATH "\"),"
 881               " please re-configure DPDK");
 882         return NULL;
 883 }
 884
 885 /**
 886  * Initialization routine for run-time dependency on rdma-core.
 887  */
 888 static int
 889 mlx4_glue_init(void)
 890 {
 891         char glue_path[sizeof(RTE_EAL_PMD_PATH) - 1 + sizeof("-glue")];
 892         const char *path[] = {
 893                 /*
 894                  * A basic security check is necessary before trusting
 895                  * MLX4_GLUE_PATH, which may override RTE_EAL_PMD_PATH.
 896                  */
 897                 (geteuid() == getuid() && getegid() == getgid() ?
 898                  getenv("MLX4_GLUE_PATH") : NULL),
 899                 /*
 900                  * When RTE_EAL_PMD_PATH is set, use its glue-suffixed
 901                  * variant, otherwise let dlopen() look up libraries on its
 902                  * own.
 903                  */
 904                 (*RTE_EAL_PMD_PATH ?
 905                  mlx4_glue_path(glue_path, sizeof(glue_path)) : ""),
 906         };
 907         unsigned int i = 0;
 908         void *handle = NULL;
 909         void **sym;
 910         const char *dlmsg;
 911
 912         while (!handle && i != RTE_DIM(path)) {
 913                 const char *end;
 914                 size_t len;
 915                 int ret;
 916
 917                 if (!path[i]) {
 918                         ++i;
 919                         continue;
 920                 }
 921                 end = strpbrk(path[i], ":;");
 922                 if (!end)
 923                         end = path[i] + strlen(path[i]);
 924                 len = end - path[i];
 925                 ret = 0;
 926                 do {
 927                         char name[ret + 1];
 928
 929                         ret = snprintf(name, sizeof(name), "%.*s%s" MLX4_GLUE,
 930                                        (int)len, path[i],
 931                                        (!len || *(end - 1) == '/') ? "" : "/");
 932                         if (ret == -1)
 933                                 break;
 934                         if (sizeof(name) != (size_t)ret + 1)
 935                                 continue;
 936                         DEBUG("looking for rdma-core glue as \"%s\"", name);
 937                         handle = dlopen(name, RTLD_LAZY);
 938                         break;
 939                 } while (1);
 940                 path[i] = end + 1;
 941                 if (!*end)
 942                         ++i;
 943         }
 944         if (!handle) {
 945                 rte_errno = EINVAL;
 946                 dlmsg = dlerror();
 947                 if (dlmsg)
 948                         WARN("cannot load glue library: %s", dlmsg);
 949                 goto glue_error;
 950         }
 951         sym = dlsym(handle, "mlx4_glue");
 952         if (!sym || !*sym) {
 953                 rte_errno = EINVAL;
 954                 dlmsg = dlerror();
 955                 if (dlmsg)
 956                         ERROR("cannot resolve glue symbol: %s", dlmsg);
 957                 goto glue_error;
 958         }
 959         mlx4_glue = *sym;
 960         return 0;
 961 glue_error:
 962         if (handle)
 963                 dlclose(handle);
 964         WARN("cannot initialize PMD due to missing run-time"
 965              " dependency on rdma-core libraries (libibverbs,"
 966              " libmlx4)");
 967         return -rte_errno;
 968 }
 969
 970 #endif
 971
 972 /**
 973  * Driver initialization routine.
 974  */
 975 RTE_INIT(rte_mlx4_pmd_init)
 976 {
 977         /*
 978          * MLX4_DEVICE_FATAL_CLEANUP tells ibv_destroy functions we
 979          * want to get success errno value in case of calling them
 980          * when the device was removed.
 981          */
 982         setenv("MLX4_DEVICE_FATAL_CLEANUP", "1", 1);
 983         /*
 984          * RDMAV_HUGEPAGES_SAFE tells ibv_fork_init() we intend to use
 985          * huge pages. Calling ibv_fork_init() during init allows
 986          * applications to use fork() safely for purposes other than
 987          * using this PMD, which is not supported in forked processes.
 988          */
 989         setenv("RDMAV_HUGEPAGES_SAFE", "1", 1);
 990 #ifdef RTE_IBVERBS_LINK_DLOPEN
 991         if (mlx4_glue_init())
 992                 return;
 993         assert(mlx4_glue);
 994 #endif
 995 #ifndef NDEBUG
 996         /* Glue structure must not contain any NULL pointers. */
 997         {
 998                 unsigned int i;
 999
1000                 for (i = 0; i != sizeof(*mlx4_glue) / sizeof(void *); ++i)
1001                         assert(((const void *const *)mlx4_glue)[i]);
1002         }
1003 #endif
1004         if (strcmp(mlx4_glue->version, MLX4_GLUE_VERSION)) {
1005                 ERROR("rdma-core glue \"%s\" mismatch: \"%s\" is required",
1006                       mlx4_glue->version, MLX4_GLUE_VERSION);
1007                 return;
1008         }
1009         mlx4_glue->fork_init();
1010         rte_pci_register(&mlx4_driver);
1011         rte_mem_event_callback_register("MLX4_MEM_EVENT_CB",
1012                                         mlx4_mr_mem_event_cb, NULL);
1013 }
1014
1015 RTE_PMD_EXPORT_NAME(net_mlx4, __COUNTER__);
1016 RTE_PMD_REGISTER_PCI_TABLE(net_mlx4, mlx4_pci_id_map);
1017 RTE_PMD_REGISTER_KMOD_DEP(net_mlx4,
1018         "* ib_uverbs & mlx4_en & mlx4_core & mlx4_ib");