drivers/net/ethernet/mellanox/mlx5/core/dev.c

   1 /*
   2  * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/mlx5/driver.h>
  34 #include <linux/mlx5/eswitch.h>
  35 #include <linux/mlx5/mlx5_ifc_vdpa.h>
  36 #include <linux/mlx5/vport.h>
  37 #include "mlx5_core.h"
  38
  39 /* intf dev list mutex */
  40 static DEFINE_MUTEX(mlx5_intf_mutex);
  41 static DEFINE_IDA(mlx5_adev_ida);
  42
  43 static bool is_eth_rep_supported(struct mlx5_core_dev *dev)
  44 {
  45         if (!IS_ENABLED(CONFIG_MLX5_ESWITCH))
  46                 return false;
  47
  48         if (!MLX5_ESWITCH_MANAGER(dev))
  49                 return false;
  50
  51         if (!is_mdev_switchdev_mode(dev))
  52                 return false;
  53
  54         return true;
  55 }
  56
  57 bool mlx5_eth_supported(struct mlx5_core_dev *dev)
  58 {
  59         if (!IS_ENABLED(CONFIG_MLX5_CORE_EN))
  60                 return false;
  61
  62         if (MLX5_CAP_GEN(dev, port_type) != MLX5_CAP_PORT_TYPE_ETH)
  63                 return false;
  64
  65         if (!MLX5_CAP_GEN(dev, eth_net_offloads)) {
  66                 mlx5_core_warn(dev, "Missing eth_net_offloads capability\n");
  67                 return false;
  68         }
  69
  70         if (!MLX5_CAP_GEN(dev, nic_flow_table)) {
  71                 mlx5_core_warn(dev, "Missing nic_flow_table capability\n");
  72                 return false;
  73         }
  74
  75         if (!MLX5_CAP_ETH(dev, csum_cap)) {
  76                 mlx5_core_warn(dev, "Missing csum_cap capability\n");
  77                 return false;
  78         }
  79
  80         if (!MLX5_CAP_ETH(dev, max_lso_cap)) {
  81                 mlx5_core_warn(dev, "Missing max_lso_cap capability\n");
  82                 return false;
  83         }
  84
  85         if (!MLX5_CAP_ETH(dev, vlan_cap)) {
  86                 mlx5_core_warn(dev, "Missing vlan_cap capability\n");
  87                 return false;
  88         }
  89
  90         if (!MLX5_CAP_ETH(dev, rss_ind_tbl_cap)) {
  91                 mlx5_core_warn(dev, "Missing rss_ind_tbl_cap capability\n");
  92                 return false;
  93         }
  94
  95         if (MLX5_CAP_FLOWTABLE(dev,
  96                                flow_table_properties_nic_receive.max_ft_level) < 3) {
  97                 mlx5_core_warn(dev, "max_ft_level < 3\n");
  98                 return false;
  99         }
 100
 101         if (!MLX5_CAP_ETH(dev, self_lb_en_modifiable))
 102                 mlx5_core_warn(dev, "Self loop back prevention is not supported\n");
 103         if (!MLX5_CAP_GEN(dev, cq_moderation))
 104                 mlx5_core_warn(dev, "CQ moderation is not supported\n");
 105
 106         return true;
 107 }
 108
 109 static bool is_eth_enabled(struct mlx5_core_dev *dev)
 110 {
 111         union devlink_param_value val;
 112         int err;
 113
 114         err = devlink_param_driverinit_value_get(priv_to_devlink(dev),
 115                                                  DEVLINK_PARAM_GENERIC_ID_ENABLE_ETH,
 116                                                  &val);
 117         return err ? false : val.vbool;
 118 }
 119
 120 bool mlx5_vnet_supported(struct mlx5_core_dev *dev)
 121 {
 122         if (!IS_ENABLED(CONFIG_MLX5_VDPA_NET))
 123                 return false;
 124
 125         if (mlx5_core_is_pf(dev))
 126                 return false;
 127
 128         if (!(MLX5_CAP_GEN_64(dev, general_obj_types) &
 129               MLX5_GENERAL_OBJ_TYPES_CAP_VIRTIO_NET_Q))
 130                 return false;
 131
 132         if (!(MLX5_CAP_DEV_VDPA_EMULATION(dev, event_mode) &
 133               MLX5_VIRTIO_Q_EVENT_MODE_QP_MODE))
 134                 return false;
 135
 136         if (!MLX5_CAP_DEV_VDPA_EMULATION(dev, eth_frame_offload_type))
 137                 return false;
 138
 139         return true;
 140 }
 141
 142 static bool is_vnet_enabled(struct mlx5_core_dev *dev)
 143 {
 144         union devlink_param_value val;
 145         int err;
 146
 147         err = devlink_param_driverinit_value_get(priv_to_devlink(dev),
 148                                                  DEVLINK_PARAM_GENERIC_ID_ENABLE_VNET,
 149                                                  &val);
 150         return err ? false : val.vbool;
 151 }
 152
 153 static bool is_ib_rep_supported(struct mlx5_core_dev *dev)
 154 {
 155         if (!IS_ENABLED(CONFIG_MLX5_INFINIBAND))
 156                 return false;
 157
 158         if (dev->priv.flags & MLX5_PRIV_FLAGS_DISABLE_IB_ADEV)
 159                 return false;
 160
 161         if (!is_eth_rep_supported(dev))
 162                 return false;
 163
 164         if (!MLX5_ESWITCH_MANAGER(dev))
 165                 return false;
 166
 167         if (!is_mdev_switchdev_mode(dev))
 168                 return false;
 169
 170         if (mlx5_core_mp_enabled(dev))
 171                 return false;
 172
 173         return true;
 174 }
 175
 176 static bool is_mp_supported(struct mlx5_core_dev *dev)
 177 {
 178         if (!IS_ENABLED(CONFIG_MLX5_INFINIBAND))
 179                 return false;
 180
 181         if (dev->priv.flags & MLX5_PRIV_FLAGS_DISABLE_IB_ADEV)
 182                 return false;
 183
 184         if (is_ib_rep_supported(dev))
 185                 return false;
 186
 187         if (MLX5_CAP_GEN(dev, port_type) != MLX5_CAP_PORT_TYPE_ETH)
 188                 return false;
 189
 190         if (!mlx5_core_is_mp_slave(dev))
 191                 return false;
 192
 193         return true;
 194 }
 195
 196 bool mlx5_rdma_supported(struct mlx5_core_dev *dev)
 197 {
 198         if (!IS_ENABLED(CONFIG_MLX5_INFINIBAND))
 199                 return false;
 200
 201         if (dev->priv.flags & MLX5_PRIV_FLAGS_DISABLE_IB_ADEV)
 202                 return false;
 203
 204         if (is_ib_rep_supported(dev))
 205                 return false;
 206
 207         if (is_mp_supported(dev))
 208                 return false;
 209
 210         return true;
 211 }
 212
 213 static bool is_ib_enabled(struct mlx5_core_dev *dev)
 214 {
 215         union devlink_param_value val;
 216         int err;
 217
 218         err = devlink_param_driverinit_value_get(priv_to_devlink(dev),
 219                                                  DEVLINK_PARAM_GENERIC_ID_ENABLE_RDMA,
 220                                                  &val);
 221         return err ? false : val.vbool;
 222 }
 223
 224 enum {
 225         MLX5_INTERFACE_PROTOCOL_ETH,
 226         MLX5_INTERFACE_PROTOCOL_ETH_REP,
 227
 228         MLX5_INTERFACE_PROTOCOL_IB,
 229         MLX5_INTERFACE_PROTOCOL_IB_REP,
 230         MLX5_INTERFACE_PROTOCOL_MPIB,
 231
 232         MLX5_INTERFACE_PROTOCOL_VNET,
 233 };
 234
 235 static const struct mlx5_adev_device {
 236         const char *suffix;
 237         bool (*is_supported)(struct mlx5_core_dev *dev);
 238         bool (*is_enabled)(struct mlx5_core_dev *dev);
 239 } mlx5_adev_devices[] = {
 240         [MLX5_INTERFACE_PROTOCOL_VNET] = { .suffix = "vnet",
 241                                            .is_supported = &mlx5_vnet_supported,
 242                                            .is_enabled = &is_vnet_enabled },
 243         [MLX5_INTERFACE_PROTOCOL_IB] = { .suffix = "rdma",
 244                                          .is_supported = &mlx5_rdma_supported,
 245                                          .is_enabled = &is_ib_enabled },
 246         [MLX5_INTERFACE_PROTOCOL_ETH] = { .suffix = "eth",
 247                                           .is_supported = &mlx5_eth_supported,
 248                                           .is_enabled = &is_eth_enabled },
 249         [MLX5_INTERFACE_PROTOCOL_ETH_REP] = { .suffix = "eth-rep",
 250                                            .is_supported = &is_eth_rep_supported },
 251         [MLX5_INTERFACE_PROTOCOL_IB_REP] = { .suffix = "rdma-rep",
 252                                            .is_supported = &is_ib_rep_supported },
 253         [MLX5_INTERFACE_PROTOCOL_MPIB] = { .suffix = "multiport",
 254                                            .is_supported = &is_mp_supported },
 255 };
 256
 257 int mlx5_adev_idx_alloc(void)
 258 {
 259         return ida_alloc(&mlx5_adev_ida, GFP_KERNEL);
 260 }
 261
 262 void mlx5_adev_idx_free(int idx)
 263 {
 264         ida_free(&mlx5_adev_ida, idx);
 265 }
 266
 267 int mlx5_adev_init(struct mlx5_core_dev *dev)
 268 {
 269         struct mlx5_priv *priv = &dev->priv;
 270
 271         priv->adev = kcalloc(ARRAY_SIZE(mlx5_adev_devices),
 272                              sizeof(struct mlx5_adev *), GFP_KERNEL);
 273         if (!priv->adev)
 274                 return -ENOMEM;
 275
 276         return 0;
 277 }
 278
 279 void mlx5_adev_cleanup(struct mlx5_core_dev *dev)
 280 {
 281         struct mlx5_priv *priv = &dev->priv;
 282
 283         kfree(priv->adev);
 284 }
 285
 286 static void adev_release(struct device *dev)
 287 {
 288         struct mlx5_adev *mlx5_adev =
 289                 container_of(dev, struct mlx5_adev, adev.dev);
 290         struct mlx5_priv *priv = &mlx5_adev->mdev->priv;
 291         int idx = mlx5_adev->idx;
 292
 293         kfree(mlx5_adev);
 294         priv->adev[idx] = NULL;
 295 }
 296
 297 static struct mlx5_adev *add_adev(struct mlx5_core_dev *dev, int idx)
 298 {
 299         const char *suffix = mlx5_adev_devices[idx].suffix;
 300         struct auxiliary_device *adev;
 301         struct mlx5_adev *madev;
 302         int ret;
 303
 304         madev = kzalloc(sizeof(*madev), GFP_KERNEL);
 305         if (!madev)
 306                 return ERR_PTR(-ENOMEM);
 307
 308         adev = &madev->adev;
 309         adev->id = dev->priv.adev_idx;
 310         adev->name = suffix;
 311         adev->dev.parent = dev->device;
 312         adev->dev.release = adev_release;
 313         madev->mdev = dev;
 314         madev->idx = idx;
 315
 316         ret = auxiliary_device_init(adev);
 317         if (ret) {
 318                 kfree(madev);
 319                 return ERR_PTR(ret);
 320         }
 321
 322         ret = auxiliary_device_add(adev);
 323         if (ret) {
 324                 auxiliary_device_uninit(adev);
 325                 return ERR_PTR(ret);
 326         }
 327         return madev;
 328 }
 329
 330 static void del_adev(struct auxiliary_device *adev)
 331 {
 332         auxiliary_device_delete(adev);
 333         auxiliary_device_uninit(adev);
 334 }
 335
 336 int mlx5_attach_device(struct mlx5_core_dev *dev)
 337 {
 338         struct mlx5_priv *priv = &dev->priv;
 339         struct auxiliary_device *adev;
 340         struct auxiliary_driver *adrv;
 341         int ret = 0, i;
 342
 343         devl_assert_locked(priv_to_devlink(dev));
 344         mutex_lock(&mlx5_intf_mutex);
 345         priv->flags &= ~MLX5_PRIV_FLAGS_DETACH;
 346         priv->flags |= MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW;
 347         for (i = 0; i < ARRAY_SIZE(mlx5_adev_devices); i++) {
 348                 if (!priv->adev[i]) {
 349                         bool is_supported = false;
 350
 351                         if (mlx5_adev_devices[i].is_enabled) {
 352                                 bool enabled;
 353
 354                                 enabled = mlx5_adev_devices[i].is_enabled(dev);
 355                                 if (!enabled)
 356                                         continue;
 357                         }
 358
 359                         if (mlx5_adev_devices[i].is_supported)
 360                                 is_supported = mlx5_adev_devices[i].is_supported(dev);
 361
 362                         if (!is_supported)
 363                                 continue;
 364
 365                         priv->adev[i] = add_adev(dev, i);
 366                         if (IS_ERR(priv->adev[i])) {
 367                                 ret = PTR_ERR(priv->adev[i]);
 368                                 priv->adev[i] = NULL;
 369                         }
 370                 } else {
 371                         adev = &priv->adev[i]->adev;
 372
 373                         /* Pay attention that this is not PCI driver that
 374                          * mlx5_core_dev is connected, but auxiliary driver.
 375                          *
 376                          * Here we can race of module unload with devlink
 377                          * reload, but we don't need to take extra lock because
 378                          * we are holding global mlx5_intf_mutex.
 379                          */
 380                         if (!adev->dev.driver)
 381                                 continue;
 382                         adrv = to_auxiliary_drv(adev->dev.driver);
 383
 384                         if (adrv->resume)
 385                                 ret = adrv->resume(adev);
 386                 }
 387                 if (ret) {
 388                         mlx5_core_warn(dev, "Device[%d] (%s) failed to load\n",
 389                                        i, mlx5_adev_devices[i].suffix);
 390
 391                         break;
 392                 }
 393         }
 394         priv->flags &= ~MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW;
 395         mutex_unlock(&mlx5_intf_mutex);
 396         return ret;
 397 }
 398
 399 void mlx5_detach_device(struct mlx5_core_dev *dev)
 400 {
 401         struct mlx5_priv *priv = &dev->priv;
 402         struct auxiliary_device *adev;
 403         struct auxiliary_driver *adrv;
 404         pm_message_t pm = {};
 405         int i;
 406
 407         devl_assert_locked(priv_to_devlink(dev));
 408         mutex_lock(&mlx5_intf_mutex);
 409         priv->flags |= MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW;
 410         for (i = ARRAY_SIZE(mlx5_adev_devices) - 1; i >= 0; i--) {
 411                 if (!priv->adev[i])
 412                         continue;
 413
 414                 if (mlx5_adev_devices[i].is_enabled) {
 415                         bool enabled;
 416
 417                         enabled = mlx5_adev_devices[i].is_enabled(dev);
 418                         if (!enabled)
 419                                 goto skip_suspend;
 420                 }
 421
 422                 adev = &priv->adev[i]->adev;
 423                 /* Auxiliary driver was unbind manually through sysfs */
 424                 if (!adev->dev.driver)
 425                         goto skip_suspend;
 426
 427                 adrv = to_auxiliary_drv(adev->dev.driver);
 428
 429                 if (adrv->suspend) {
 430                         adrv->suspend(adev, pm);
 431                         continue;
 432                 }
 433
 434 skip_suspend:
 435                 del_adev(&priv->adev[i]->adev);
 436                 priv->adev[i] = NULL;
 437         }
 438         priv->flags &= ~MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW;
 439         priv->flags |= MLX5_PRIV_FLAGS_DETACH;
 440         mutex_unlock(&mlx5_intf_mutex);
 441 }
 442
 443 int mlx5_register_device(struct mlx5_core_dev *dev)
 444 {
 445         int ret;
 446
 447         devl_assert_locked(priv_to_devlink(dev));
 448         mutex_lock(&mlx5_intf_mutex);
 449         dev->priv.flags &= ~MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
 450         ret = mlx5_rescan_drivers_locked(dev);
 451         mutex_unlock(&mlx5_intf_mutex);
 452         if (ret)
 453                 mlx5_unregister_device(dev);
 454
 455         return ret;
 456 }
 457
 458 void mlx5_unregister_device(struct mlx5_core_dev *dev)
 459 {
 460         devl_assert_locked(priv_to_devlink(dev));
 461         mutex_lock(&mlx5_intf_mutex);
 462         dev->priv.flags = MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
 463         mlx5_rescan_drivers_locked(dev);
 464         mutex_unlock(&mlx5_intf_mutex);
 465 }
 466
 467 static int add_drivers(struct mlx5_core_dev *dev)
 468 {
 469         struct mlx5_priv *priv = &dev->priv;
 470         int i, ret = 0;
 471
 472         for (i = 0; i < ARRAY_SIZE(mlx5_adev_devices); i++) {
 473                 bool is_supported = false;
 474
 475                 if (priv->adev[i])
 476                         continue;
 477
 478                 if (mlx5_adev_devices[i].is_supported)
 479                         is_supported = mlx5_adev_devices[i].is_supported(dev);
 480
 481                 if (!is_supported)
 482                         continue;
 483
 484                 priv->adev[i] = add_adev(dev, i);
 485                 if (IS_ERR(priv->adev[i])) {
 486                         mlx5_core_warn(dev, "Device[%d] (%s) failed to load\n",
 487                                        i, mlx5_adev_devices[i].suffix);
 488                         /* We continue to rescan drivers and leave to the caller
 489                          * to make decision if to release everything or continue.
 490                          */
 491                         ret = PTR_ERR(priv->adev[i]);
 492                         priv->adev[i] = NULL;
 493                 }
 494         }
 495         return ret;
 496 }
 497
 498 static void delete_drivers(struct mlx5_core_dev *dev)
 499 {
 500         struct mlx5_priv *priv = &dev->priv;
 501         bool delete_all;
 502         int i;
 503
 504         delete_all = priv->flags & MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
 505
 506         for (i = ARRAY_SIZE(mlx5_adev_devices) - 1; i >= 0; i--) {
 507                 bool is_supported = false;
 508
 509                 if (!priv->adev[i])
 510                         continue;
 511
 512                 if (mlx5_adev_devices[i].is_enabled) {
 513                         bool enabled;
 514
 515                         enabled = mlx5_adev_devices[i].is_enabled(dev);
 516                         if (!enabled)
 517                                 goto del_adev;
 518                 }
 519
 520                 if (mlx5_adev_devices[i].is_supported && !delete_all)
 521                         is_supported = mlx5_adev_devices[i].is_supported(dev);
 522
 523                 if (is_supported)
 524                         continue;
 525
 526 del_adev:
 527                 del_adev(&priv->adev[i]->adev);
 528                 priv->adev[i] = NULL;
 529         }
 530 }
 531
 532 /* This function is used after mlx5_core_dev is reconfigured.
 533  */
 534 int mlx5_rescan_drivers_locked(struct mlx5_core_dev *dev)
 535 {
 536         struct mlx5_priv *priv = &dev->priv;
 537         int err = 0;
 538
 539         lockdep_assert_held(&mlx5_intf_mutex);
 540         if (priv->flags & MLX5_PRIV_FLAGS_DETACH)
 541                 return 0;
 542
 543         priv->flags |= MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW;
 544         delete_drivers(dev);
 545         if (priv->flags & MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV)
 546                 goto out;
 547
 548         err = add_drivers(dev);
 549
 550 out:
 551         priv->flags &= ~MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW;
 552         return err;
 553 }
 554
 555 bool mlx5_same_hw_devs(struct mlx5_core_dev *dev, struct mlx5_core_dev *peer_dev)
 556 {
 557         u64 fsystem_guid, psystem_guid;
 558
 559         fsystem_guid = mlx5_query_nic_system_image_guid(dev);
 560         psystem_guid = mlx5_query_nic_system_image_guid(peer_dev);
 561
 562         return (fsystem_guid && psystem_guid && fsystem_guid == psystem_guid);
 563 }
 564
 565 static u32 mlx5_gen_pci_id(const struct mlx5_core_dev *dev)
 566 {
 567         return (u32)((pci_domain_nr(dev->pdev->bus) << 16) |
 568                      (dev->pdev->bus->number << 8) |
 569                      PCI_SLOT(dev->pdev->devfn));
 570 }
 571
 572 static int _next_phys_dev(struct mlx5_core_dev *mdev,
 573                           const struct mlx5_core_dev *curr)
 574 {
 575         if (!mlx5_core_is_pf(mdev))
 576                 return 0;
 577
 578         if (mdev == curr)
 579                 return 0;
 580
 581         if (!mlx5_same_hw_devs(mdev, (struct mlx5_core_dev *)curr) &&
 582             mlx5_gen_pci_id(mdev) != mlx5_gen_pci_id(curr))
 583                 return 0;
 584
 585         return 1;
 586 }
 587
 588 static void *pci_get_other_drvdata(struct device *this, struct device *other)
 589 {
 590         if (this->driver != other->driver)
 591                 return NULL;
 592
 593         return pci_get_drvdata(to_pci_dev(other));
 594 }
 595
 596 static int next_phys_dev_lag(struct device *dev, const void *data)
 597 {
 598         struct mlx5_core_dev *mdev, *this = (struct mlx5_core_dev *)data;
 599
 600         mdev = pci_get_other_drvdata(this->device, dev);
 601         if (!mdev)
 602                 return 0;
 603
 604         if (!MLX5_CAP_GEN(mdev, vport_group_manager) ||
 605             !MLX5_CAP_GEN(mdev, lag_master) ||
 606             (MLX5_CAP_GEN(mdev, num_lag_ports) > MLX5_MAX_PORTS ||
 607              MLX5_CAP_GEN(mdev, num_lag_ports) <= 1))
 608                 return 0;
 609
 610         return _next_phys_dev(mdev, data);
 611 }
 612
 613 static struct mlx5_core_dev *mlx5_get_next_dev(struct mlx5_core_dev *dev,
 614                                                int (*match)(struct device *dev, const void *data))
 615 {
 616         struct device *next;
 617
 618         if (!mlx5_core_is_pf(dev))
 619                 return NULL;
 620
 621         next = bus_find_device(&pci_bus_type, NULL, dev, match);
 622         if (!next)
 623                 return NULL;
 624
 625         put_device(next);
 626         return pci_get_drvdata(to_pci_dev(next));
 627 }
 628
 629 /* Must be called with intf_mutex held */
 630 struct mlx5_core_dev *mlx5_get_next_phys_dev_lag(struct mlx5_core_dev *dev)
 631 {
 632         lockdep_assert_held(&mlx5_intf_mutex);
 633         return mlx5_get_next_dev(dev, &next_phys_dev_lag);
 634 }
 635
 636 void mlx5_dev_list_lock(void)
 637 {
 638         mutex_lock(&mlx5_intf_mutex);
 639 }
 640 void mlx5_dev_list_unlock(void)
 641 {
 642         mutex_unlock(&mlx5_intf_mutex);
 643 }
 644
 645 int mlx5_dev_list_trylock(void)
 646 {
 647         return mutex_trylock(&mlx5_intf_mutex);
 648 }