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

   1 /*
   2  * Copyright (c) 2017, 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 <rdma/ib_verbs.h>
  34 #include <linux/mlx5/fs.h>
  35 #include "en.h"
  36 #include "ipoib.h"
  37
  38 #define IB_DEFAULT_Q_KEY   0xb1b
  39 #define MLX5I_PARAMS_DEFAULT_LOG_RQ_SIZE 9
  40
  41 static int mlx5i_open(struct net_device *netdev);
  42 static int mlx5i_close(struct net_device *netdev);
  43 static int  mlx5i_dev_init(struct net_device *dev);
  44 static void mlx5i_dev_cleanup(struct net_device *dev);
  45 static int mlx5i_change_mtu(struct net_device *netdev, int new_mtu);
  46 static int mlx5i_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
  47
  48 static const struct net_device_ops mlx5i_netdev_ops = {
  49         .ndo_open                = mlx5i_open,
  50         .ndo_stop                = mlx5i_close,
  51         .ndo_init                = mlx5i_dev_init,
  52         .ndo_uninit              = mlx5i_dev_cleanup,
  53         .ndo_change_mtu          = mlx5i_change_mtu,
  54         .ndo_do_ioctl            = mlx5i_ioctl,
  55 };
  56
  57 /* IPoIB mlx5 netdev profile */
  58 static void mlx5i_build_nic_params(struct mlx5_core_dev *mdev,
  59                                    struct mlx5e_params *params)
  60 {
  61         /* Override RQ params as IPoIB supports only LINKED LIST RQ for now */
  62         mlx5e_set_rq_type_params(mdev, params, MLX5_WQ_TYPE_LINKED_LIST);
  63
  64         /* RQ size in ipoib by default is 512 */
  65         params->log_rq_size = is_kdump_kernel() ?
  66                 MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE :
  67                 MLX5I_PARAMS_DEFAULT_LOG_RQ_SIZE;
  68
  69         params->lro_en = false;
  70 }
  71
  72 /* Called directly after IPoIB netdevice was created to initialize SW structs */
  73 static void mlx5i_init(struct mlx5_core_dev *mdev,
  74                        struct net_device *netdev,
  75                        const struct mlx5e_profile *profile,
  76                        void *ppriv)
  77 {
  78         struct mlx5e_priv *priv  = mlx5i_epriv(netdev);
  79
  80         /* priv init */
  81         priv->mdev        = mdev;
  82         priv->netdev      = netdev;
  83         priv->profile     = profile;
  84         priv->ppriv       = ppriv;
  85         priv->hard_mtu = MLX5_IB_GRH_BYTES + MLX5_IPOIB_HARD_LEN;
  86         mutex_init(&priv->state_lock);
  87
  88         mlx5e_build_nic_params(mdev, &priv->channels.params, profile->max_nch(mdev));
  89         mlx5i_build_nic_params(mdev, &priv->channels.params);
  90
  91         /* netdev init */
  92         netdev->hw_features    |= NETIF_F_SG;
  93         netdev->hw_features    |= NETIF_F_IP_CSUM;
  94         netdev->hw_features    |= NETIF_F_IPV6_CSUM;
  95         netdev->hw_features    |= NETIF_F_GRO;
  96         netdev->hw_features    |= NETIF_F_TSO;
  97         netdev->hw_features    |= NETIF_F_TSO6;
  98         netdev->hw_features    |= NETIF_F_RXCSUM;
  99         netdev->hw_features    |= NETIF_F_RXHASH;
 100
 101         netdev->netdev_ops = &mlx5i_netdev_ops;
 102         netdev->ethtool_ops = &mlx5i_ethtool_ops;
 103 }
 104
 105 /* Called directly before IPoIB netdevice is destroyed to cleanup SW structs */
 106 static void mlx5i_cleanup(struct mlx5e_priv *priv)
 107 {
 108         /* Do nothing .. */
 109 }
 110
 111 #define MLX5_QP_ENHANCED_ULP_STATELESS_MODE 2
 112
 113 static int mlx5i_create_underlay_qp(struct mlx5_core_dev *mdev, struct mlx5_core_qp *qp)
 114 {
 115         struct mlx5_qp_context *context = NULL;
 116         u32 *in = NULL;
 117         void *addr_path;
 118         int ret = 0;
 119         int inlen;
 120         void *qpc;
 121
 122         inlen = MLX5_ST_SZ_BYTES(create_qp_in);
 123         in = kvzalloc(inlen, GFP_KERNEL);
 124         if (!in)
 125                 return -ENOMEM;
 126
 127         qpc = MLX5_ADDR_OF(create_qp_in, in, qpc);
 128         MLX5_SET(qpc, qpc, st, MLX5_QP_ST_UD);
 129         MLX5_SET(qpc, qpc, pm_state, MLX5_QP_PM_MIGRATED);
 130         MLX5_SET(qpc, qpc, ulp_stateless_offload_mode,
 131                  MLX5_QP_ENHANCED_ULP_STATELESS_MODE);
 132
 133         addr_path = MLX5_ADDR_OF(qpc, qpc, primary_address_path);
 134         MLX5_SET(ads, addr_path, port, 1);
 135         MLX5_SET(ads, addr_path, grh, 1);
 136
 137         ret = mlx5_core_create_qp(mdev, qp, in, inlen);
 138         if (ret) {
 139                 mlx5_core_err(mdev, "Failed creating IPoIB QP err : %d\n", ret);
 140                 goto out;
 141         }
 142
 143         /* QP states */
 144         context = kzalloc(sizeof(*context), GFP_KERNEL);
 145         if (!context) {
 146                 ret = -ENOMEM;
 147                 goto out;
 148         }
 149
 150         context->flags = cpu_to_be32(MLX5_QP_PM_MIGRATED << 11);
 151         context->pri_path.port = 1;
 152         context->qkey = cpu_to_be32(IB_DEFAULT_Q_KEY);
 153
 154         ret = mlx5_core_qp_modify(mdev, MLX5_CMD_OP_RST2INIT_QP, 0, context, qp);
 155         if (ret) {
 156                 mlx5_core_err(mdev, "Failed to modify qp RST2INIT, err: %d\n", ret);
 157                 goto out;
 158         }
 159         memset(context, 0, sizeof(*context));
 160
 161         ret = mlx5_core_qp_modify(mdev, MLX5_CMD_OP_INIT2RTR_QP, 0, context, qp);
 162         if (ret) {
 163                 mlx5_core_err(mdev, "Failed to modify qp INIT2RTR, err: %d\n", ret);
 164                 goto out;
 165         }
 166
 167         ret = mlx5_core_qp_modify(mdev, MLX5_CMD_OP_RTR2RTS_QP, 0, context, qp);
 168         if (ret) {
 169                 mlx5_core_err(mdev, "Failed to modify qp RTR2RTS, err: %d\n", ret);
 170                 goto out;
 171         }
 172
 173 out:
 174         kfree(context);
 175         kvfree(in);
 176         return ret;
 177 }
 178
 179 static void mlx5i_destroy_underlay_qp(struct mlx5_core_dev *mdev, struct mlx5_core_qp *qp)
 180 {
 181         mlx5_fs_remove_rx_underlay_qpn(mdev, qp->qpn);
 182
 183         mlx5_core_destroy_qp(mdev, qp);
 184 }
 185
 186 static int mlx5i_init_tx(struct mlx5e_priv *priv)
 187 {
 188         struct mlx5i_priv *ipriv = priv->ppriv;
 189         int err;
 190
 191         err = mlx5i_create_underlay_qp(priv->mdev, &ipriv->qp);
 192         if (err) {
 193                 mlx5_core_warn(priv->mdev, "create underlay QP failed, %d\n", err);
 194                 return err;
 195         }
 196
 197         mlx5_fs_add_rx_underlay_qpn(priv->mdev, ipriv->qp.qpn);
 198
 199         err = mlx5e_create_tis(priv->mdev, 0 /* tc */, ipriv->qp.qpn, &priv->tisn[0]);
 200         if (err) {
 201                 mlx5_core_warn(priv->mdev, "create tis failed, %d\n", err);
 202                 return err;
 203         }
 204
 205         return 0;
 206 }
 207
 208 static void mlx5i_cleanup_tx(struct mlx5e_priv *priv)
 209 {
 210         struct mlx5i_priv *ipriv = priv->ppriv;
 211
 212         mlx5e_destroy_tis(priv->mdev, priv->tisn[0]);
 213         mlx5i_destroy_underlay_qp(priv->mdev, &ipriv->qp);
 214 }
 215
 216 static int mlx5i_create_flow_steering(struct mlx5e_priv *priv)
 217 {
 218         int err;
 219
 220         priv->fs.ns = mlx5_get_flow_namespace(priv->mdev,
 221                                                MLX5_FLOW_NAMESPACE_KERNEL);
 222
 223         if (!priv->fs.ns)
 224                 return -EINVAL;
 225
 226         err = mlx5e_arfs_create_tables(priv);
 227         if (err) {
 228                 netdev_err(priv->netdev, "Failed to create arfs tables, err=%d\n",
 229                            err);
 230                 priv->netdev->hw_features &= ~NETIF_F_NTUPLE;
 231         }
 232
 233         err = mlx5e_create_ttc_table(priv);
 234         if (err) {
 235                 netdev_err(priv->netdev, "Failed to create ttc table, err=%d\n",
 236                            err);
 237                 goto err_destroy_arfs_tables;
 238         }
 239
 240         return 0;
 241
 242 err_destroy_arfs_tables:
 243         mlx5e_arfs_destroy_tables(priv);
 244
 245         return err;
 246 }
 247
 248 static void mlx5i_destroy_flow_steering(struct mlx5e_priv *priv)
 249 {
 250         mlx5e_destroy_ttc_table(priv);
 251         mlx5e_arfs_destroy_tables(priv);
 252 }
 253
 254 static int mlx5i_init_rx(struct mlx5e_priv *priv)
 255 {
 256         int err;
 257
 258         err = mlx5e_create_indirect_rqt(priv);
 259         if (err)
 260                 return err;
 261
 262         err = mlx5e_create_direct_rqts(priv);
 263         if (err)
 264                 goto err_destroy_indirect_rqts;
 265
 266         err = mlx5e_create_indirect_tirs(priv);
 267         if (err)
 268                 goto err_destroy_direct_rqts;
 269
 270         err = mlx5e_create_direct_tirs(priv);
 271         if (err)
 272                 goto err_destroy_indirect_tirs;
 273
 274         err = mlx5i_create_flow_steering(priv);
 275         if (err)
 276                 goto err_destroy_direct_tirs;
 277
 278         return 0;
 279
 280 err_destroy_direct_tirs:
 281         mlx5e_destroy_direct_tirs(priv);
 282 err_destroy_indirect_tirs:
 283         mlx5e_destroy_indirect_tirs(priv);
 284 err_destroy_direct_rqts:
 285         mlx5e_destroy_direct_rqts(priv);
 286 err_destroy_indirect_rqts:
 287         mlx5e_destroy_rqt(priv, &priv->indir_rqt);
 288         return err;
 289 }
 290
 291 static void mlx5i_cleanup_rx(struct mlx5e_priv *priv)
 292 {
 293         mlx5i_destroy_flow_steering(priv);
 294         mlx5e_destroy_direct_tirs(priv);
 295         mlx5e_destroy_indirect_tirs(priv);
 296         mlx5e_destroy_direct_rqts(priv);
 297         mlx5e_destroy_rqt(priv, &priv->indir_rqt);
 298 }
 299
 300 static const struct mlx5e_profile mlx5i_nic_profile = {
 301         .init              = mlx5i_init,
 302         .cleanup           = mlx5i_cleanup,
 303         .init_tx           = mlx5i_init_tx,
 304         .cleanup_tx        = mlx5i_cleanup_tx,
 305         .init_rx           = mlx5i_init_rx,
 306         .cleanup_rx        = mlx5i_cleanup_rx,
 307         .enable            = NULL, /* mlx5i_enable */
 308         .disable           = NULL, /* mlx5i_disable */
 309         .update_stats      = NULL, /* mlx5i_update_stats */
 310         .max_nch           = mlx5e_get_max_num_channels,
 311         .update_carrier    = NULL, /* no HW update in IB link */
 312         .rx_handlers.handle_rx_cqe       = mlx5i_handle_rx_cqe,
 313         .rx_handlers.handle_rx_cqe_mpwqe = NULL, /* Not supported */
 314         .max_tc            = MLX5I_MAX_NUM_TC,
 315 };
 316
 317 /* mlx5i netdev NDos */
 318
 319 static int mlx5i_change_mtu(struct net_device *netdev, int new_mtu)
 320 {
 321         struct mlx5e_priv *priv = mlx5i_epriv(netdev);
 322         struct mlx5e_channels new_channels = {};
 323         int curr_mtu;
 324         int err = 0;
 325
 326         mutex_lock(&priv->state_lock);
 327
 328         curr_mtu    = netdev->mtu;
 329         netdev->mtu = new_mtu;
 330
 331         if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 332                 goto out;
 333
 334         new_channels.params = priv->channels.params;
 335         err = mlx5e_open_channels(priv, &new_channels);
 336         if (err) {
 337                 netdev->mtu = curr_mtu;
 338                 goto out;
 339         }
 340
 341         mlx5e_switch_priv_channels(priv, &new_channels, NULL);
 342
 343 out:
 344         mutex_unlock(&priv->state_lock);
 345         return err;
 346 }
 347
 348 static int mlx5i_dev_init(struct net_device *dev)
 349 {
 350         struct mlx5e_priv    *priv   = mlx5i_epriv(dev);
 351         struct mlx5i_priv    *ipriv  = priv->ppriv;
 352
 353         /* Set dev address using underlay QP */
 354         dev->dev_addr[1] = (ipriv->qp.qpn >> 16) & 0xff;
 355         dev->dev_addr[2] = (ipriv->qp.qpn >>  8) & 0xff;
 356         dev->dev_addr[3] = (ipriv->qp.qpn) & 0xff;
 357
 358         return 0;
 359 }
 360
 361 static int mlx5i_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 362 {
 363         struct mlx5e_priv *priv = mlx5i_epriv(dev);
 364
 365         switch (cmd) {
 366         case SIOCSHWTSTAMP:
 367                 return mlx5e_hwstamp_set(priv, ifr);
 368         case SIOCGHWTSTAMP:
 369                 return mlx5e_hwstamp_get(priv, ifr);
 370         default:
 371                 return -EOPNOTSUPP;
 372         }
 373 }
 374
 375 static void mlx5i_dev_cleanup(struct net_device *dev)
 376 {
 377         struct mlx5e_priv    *priv   = mlx5i_epriv(dev);
 378         struct mlx5_core_dev *mdev   = priv->mdev;
 379         struct mlx5i_priv    *ipriv  = priv->ppriv;
 380         struct mlx5_qp_context context;
 381
 382         /* detach qp from flow-steering by reset it */
 383         mlx5_core_qp_modify(mdev, MLX5_CMD_OP_2RST_QP, 0, &context, &ipriv->qp);
 384 }
 385
 386 static int mlx5i_open(struct net_device *netdev)
 387 {
 388         struct mlx5e_priv *priv = mlx5i_epriv(netdev);
 389         int err;
 390
 391         mutex_lock(&priv->state_lock);
 392
 393         set_bit(MLX5E_STATE_OPENED, &priv->state);
 394
 395         err = mlx5e_open_channels(priv, &priv->channels);
 396         if (err)
 397                 goto err_clear_state_opened_flag;
 398
 399         mlx5e_refresh_tirs(priv, false);
 400         mlx5e_activate_priv_channels(priv);
 401         mlx5e_timestamp_init(priv);
 402
 403         mutex_unlock(&priv->state_lock);
 404         return 0;
 405
 406 err_clear_state_opened_flag:
 407         clear_bit(MLX5E_STATE_OPENED, &priv->state);
 408         mutex_unlock(&priv->state_lock);
 409         return err;
 410 }
 411
 412 static int mlx5i_close(struct net_device *netdev)
 413 {
 414         struct mlx5e_priv *priv = mlx5i_epriv(netdev);
 415
 416         /* May already be CLOSED in case a previous configuration operation
 417          * (e.g RX/TX queue size change) that involves close&open failed.
 418          */
 419         mutex_lock(&priv->state_lock);
 420
 421         if (!test_bit(MLX5E_STATE_OPENED, &priv->state))
 422                 goto unlock;
 423
 424         clear_bit(MLX5E_STATE_OPENED, &priv->state);
 425
 426         mlx5e_timestamp_cleanup(priv);
 427         netif_carrier_off(priv->netdev);
 428         mlx5e_deactivate_priv_channels(priv);
 429         mlx5e_close_channels(&priv->channels);
 430 unlock:
 431         mutex_unlock(&priv->state_lock);
 432         return 0;
 433 }
 434
 435 /* IPoIB RDMA netdev callbacks */
 436 static int mlx5i_attach_mcast(struct net_device *netdev, struct ib_device *hca,
 437                               union ib_gid *gid, u16 lid, int set_qkey,
 438                               u32 qkey)
 439 {
 440         struct mlx5e_priv    *epriv = mlx5i_epriv(netdev);
 441         struct mlx5_core_dev *mdev  = epriv->mdev;
 442         struct mlx5i_priv    *ipriv = epriv->ppriv;
 443         int err;
 444
 445         mlx5_core_dbg(mdev, "attaching QPN 0x%x, MGID %pI6\n", ipriv->qp.qpn, gid->raw);
 446         err = mlx5_core_attach_mcg(mdev, gid, ipriv->qp.qpn);
 447         if (err)
 448                 mlx5_core_warn(mdev, "failed attaching QPN 0x%x, MGID %pI6\n",
 449                                ipriv->qp.qpn, gid->raw);
 450
 451         if (set_qkey) {
 452                 mlx5_core_dbg(mdev, "%s setting qkey 0x%x\n",
 453                               netdev->name, qkey);
 454                 ipriv->qkey = qkey;
 455         }
 456
 457         return err;
 458 }
 459
 460 static int mlx5i_detach_mcast(struct net_device *netdev, struct ib_device *hca,
 461                               union ib_gid *gid, u16 lid)
 462 {
 463         struct mlx5e_priv    *epriv = mlx5i_epriv(netdev);
 464         struct mlx5_core_dev *mdev  = epriv->mdev;
 465         struct mlx5i_priv    *ipriv = epriv->ppriv;
 466         int err;
 467
 468         mlx5_core_dbg(mdev, "detaching QPN 0x%x, MGID %pI6\n", ipriv->qp.qpn, gid->raw);
 469
 470         err = mlx5_core_detach_mcg(mdev, gid, ipriv->qp.qpn);
 471         if (err)
 472                 mlx5_core_dbg(mdev, "failed dettaching QPN 0x%x, MGID %pI6\n",
 473                               ipriv->qp.qpn, gid->raw);
 474
 475         return err;
 476 }
 477
 478 static int mlx5i_xmit(struct net_device *dev, struct sk_buff *skb,
 479                       struct ib_ah *address, u32 dqpn)
 480 {
 481         struct mlx5e_priv *epriv = mlx5i_epriv(dev);
 482         struct mlx5e_txqsq *sq   = epriv->txq2sq[skb_get_queue_mapping(skb)];
 483         struct mlx5_ib_ah *mah   = to_mah(address);
 484         struct mlx5i_priv *ipriv = epriv->ppriv;
 485
 486         return mlx5i_sq_xmit(sq, skb, &mah->av, dqpn, ipriv->qkey);
 487 }
 488
 489 static int mlx5i_check_required_hca_cap(struct mlx5_core_dev *mdev)
 490 {
 491         if (MLX5_CAP_GEN(mdev, port_type) != MLX5_CAP_PORT_TYPE_IB)
 492                 return -EOPNOTSUPP;
 493
 494         if (!MLX5_CAP_GEN(mdev, ipoib_enhanced_offloads)) {
 495                 mlx5_core_warn(mdev, "IPoIB enhanced offloads are not supported\n");
 496                 return -EOPNOTSUPP;
 497         }
 498
 499         return 0;
 500 }
 501
 502 struct net_device *mlx5_rdma_netdev_alloc(struct mlx5_core_dev *mdev,
 503                                           struct ib_device *ibdev,
 504                                           const char *name,
 505                                           void (*setup)(struct net_device *))
 506 {
 507         const struct mlx5e_profile *profile = &mlx5i_nic_profile;
 508         int nch = profile->max_nch(mdev);
 509         struct net_device *netdev;
 510         struct mlx5i_priv *ipriv;
 511         struct mlx5e_priv *epriv;
 512         struct rdma_netdev *rn;
 513         int err;
 514
 515         if (mlx5i_check_required_hca_cap(mdev)) {
 516                 mlx5_core_warn(mdev, "Accelerated mode is not supported\n");
 517                 return ERR_PTR(-EOPNOTSUPP);
 518         }
 519
 520         /* This function should only be called once per mdev */
 521         err = mlx5e_create_mdev_resources(mdev);
 522         if (err)
 523                 return NULL;
 524
 525         netdev = alloc_netdev_mqs(sizeof(struct mlx5i_priv) + sizeof(struct mlx5e_priv),
 526                                   name, NET_NAME_UNKNOWN,
 527                                   setup,
 528                                   nch * MLX5E_MAX_NUM_TC,
 529                                   nch);
 530         if (!netdev) {
 531                 mlx5_core_warn(mdev, "alloc_netdev_mqs failed\n");
 532                 goto free_mdev_resources;
 533         }
 534
 535         ipriv = netdev_priv(netdev);
 536         epriv = mlx5i_epriv(netdev);
 537
 538         epriv->wq = create_singlethread_workqueue("mlx5i");
 539         if (!epriv->wq)
 540                 goto err_free_netdev;
 541
 542         profile->init(mdev, netdev, profile, ipriv);
 543
 544         mlx5e_attach_netdev(epriv);
 545         netif_carrier_off(netdev);
 546
 547         /* set rdma_netdev func pointers */
 548         rn = &ipriv->rn;
 549         rn->hca  = ibdev;
 550         rn->send = mlx5i_xmit;
 551         rn->attach_mcast = mlx5i_attach_mcast;
 552         rn->detach_mcast = mlx5i_detach_mcast;
 553
 554         return netdev;
 555
 556 err_free_netdev:
 557         free_netdev(netdev);
 558 free_mdev_resources:
 559         mlx5e_destroy_mdev_resources(mdev);
 560
 561         return NULL;
 562 }
 563 EXPORT_SYMBOL(mlx5_rdma_netdev_alloc);
 564
 565 void mlx5_rdma_netdev_free(struct net_device *netdev)
 566 {
 567         struct mlx5e_priv          *priv    = mlx5i_epriv(netdev);
 568         const struct mlx5e_profile *profile = priv->profile;
 569
 570         mlx5e_detach_netdev(priv);
 571         profile->cleanup(priv);
 572         destroy_workqueue(priv->wq);
 573         free_netdev(netdev);
 574
 575         mlx5e_destroy_mdev_resources(priv->mdev);
 576 }
 577 EXPORT_SYMBOL(mlx5_rdma_netdev_free);