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 "mlx5_core.h"
  37
  38 /* intf dev list mutex */
  39 static DEFINE_MUTEX(mlx5_intf_mutex);
  40 static DEFINE_IDA(mlx5_adev_ida);
  41
  42 static bool is_eth_rep_supported(struct mlx5_core_dev *dev)
  43 {
  44         if (!IS_ENABLED(CONFIG_MLX5_ESWITCH))
  45                 return false;
  46
  47         if (!MLX5_ESWITCH_MANAGER(dev))
  48                 return false;
  49
  50         if (!is_mdev_switchdev_mode(dev))
  51                 return false;
  52
  53         return true;
  54 }
  55
  56 static bool is_eth_supported(struct mlx5_core_dev *dev)
  57 {
  58         if (!IS_ENABLED(CONFIG_MLX5_CORE_EN))
  59                 return false;
  60
  61         if (is_eth_rep_supported(dev))
  62                 return false;
  63
  64         if (MLX5_CAP_GEN(dev, port_type) != MLX5_CAP_PORT_TYPE_ETH)
  65                 return false;
  66
  67         if (!MLX5_CAP_GEN(dev, eth_net_offloads)) {
  68                 mlx5_core_warn(dev, "Missing eth_net_offloads capability\n");
  69                 return false;
  70         }
  71
  72         if (!MLX5_CAP_GEN(dev, nic_flow_table)) {
  73                 mlx5_core_warn(dev, "Missing nic_flow_table capability\n");
  74                 return false;
  75         }
  76
  77         if (!MLX5_CAP_ETH(dev, csum_cap)) {
  78                 mlx5_core_warn(dev, "Missing csum_cap capability\n");
  79                 return false;
  80         }
  81
  82         if (!MLX5_CAP_ETH(dev, max_lso_cap)) {
  83                 mlx5_core_warn(dev, "Missing max_lso_cap capability\n");
  84                 return false;
  85         }
  86
  87         if (!MLX5_CAP_ETH(dev, vlan_cap)) {
  88                 mlx5_core_warn(dev, "Missing vlan_cap capability\n");
  89                 return false;
  90         }
  91
  92         if (!MLX5_CAP_ETH(dev, rss_ind_tbl_cap)) {
  93                 mlx5_core_warn(dev, "Missing rss_ind_tbl_cap capability\n");
  94                 return false;
  95         }
  96
  97         if (MLX5_CAP_FLOWTABLE(dev,
  98                                flow_table_properties_nic_receive.max_ft_level) < 3) {
  99                 mlx5_core_warn(dev, "max_ft_level < 3\n");
 100                 return false;
 101         }
 102
 103         if (!MLX5_CAP_ETH(dev, self_lb_en_modifiable))
 104                 mlx5_core_warn(dev, "Self loop back prevention is not supported\n");
 105         if (!MLX5_CAP_GEN(dev, cq_moderation))
 106                 mlx5_core_warn(dev, "CQ moderation is not supported\n");
 107
 108         return true;
 109 }
 110
 111 static bool is_vnet_supported(struct mlx5_core_dev *dev)
 112 {
 113         if (!IS_ENABLED(CONFIG_MLX5_VDPA_NET))
 114                 return false;
 115
 116         if (mlx5_core_is_pf(dev))
 117                 return false;
 118
 119         if (!(MLX5_CAP_GEN_64(dev, general_obj_types) &
 120               MLX5_GENERAL_OBJ_TYPES_CAP_VIRTIO_NET_Q))
 121                 return false;
 122
 123         if (!(MLX5_CAP_DEV_VDPA_EMULATION(dev, event_mode) &
 124               MLX5_VIRTIO_Q_EVENT_MODE_QP_MODE))
 125                 return false;
 126
 127         if (!MLX5_CAP_DEV_VDPA_EMULATION(dev, eth_frame_offload_type))
 128                 return false;
 129
 130         return true;
 131 }
 132
 133 static bool is_ib_rep_supported(struct mlx5_core_dev *dev)
 134 {
 135         if (!IS_ENABLED(CONFIG_MLX5_INFINIBAND))
 136                 return false;
 137
 138         if (dev->priv.flags & MLX5_PRIV_FLAGS_DISABLE_IB_ADEV)
 139                 return false;
 140
 141         if (!is_eth_rep_supported(dev))
 142                 return false;
 143
 144         if (!MLX5_ESWITCH_MANAGER(dev))
 145                 return false;
 146
 147         if (!is_mdev_switchdev_mode(dev))
 148                 return false;
 149
 150         if (mlx5_core_mp_enabled(dev))
 151                 return false;
 152
 153         return true;
 154 }
 155
 156 static bool is_mp_supported(struct mlx5_core_dev *dev)
 157 {
 158         if (!IS_ENABLED(CONFIG_MLX5_INFINIBAND))
 159                 return false;
 160
 161         if (dev->priv.flags & MLX5_PRIV_FLAGS_DISABLE_IB_ADEV)
 162                 return false;
 163
 164         if (is_ib_rep_supported(dev))
 165                 return false;
 166
 167         if (MLX5_CAP_GEN(dev, port_type) != MLX5_CAP_PORT_TYPE_ETH)
 168                 return false;
 169
 170         if (!mlx5_core_is_mp_slave(dev))
 171                 return false;
 172
 173         return true;
 174 }
 175
 176 static bool is_ib_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 (is_mp_supported(dev))
 188                 return false;
 189
 190         return true;
 191 }
 192
 193 enum {
 194         MLX5_INTERFACE_PROTOCOL_ETH_REP,
 195         MLX5_INTERFACE_PROTOCOL_ETH,
 196
 197         MLX5_INTERFACE_PROTOCOL_IB_REP,
 198         MLX5_INTERFACE_PROTOCOL_MPIB,
 199         MLX5_INTERFACE_PROTOCOL_IB,
 200
 201         MLX5_INTERFACE_PROTOCOL_VNET,
 202 };
 203
 204 static const struct mlx5_adev_device {
 205         const char *suffix;
 206         bool (*is_supported)(struct mlx5_core_dev *dev);
 207 } mlx5_adev_devices[] = {
 208         [MLX5_INTERFACE_PROTOCOL_VNET] = { .suffix = "vnet",
 209                                            .is_supported = &is_vnet_supported },
 210         [MLX5_INTERFACE_PROTOCOL_IB] = { .suffix = "rdma",
 211                                          .is_supported = &is_ib_supported },
 212         [MLX5_INTERFACE_PROTOCOL_ETH] = { .suffix = "eth",
 213                                           .is_supported = &is_eth_supported },
 214         [MLX5_INTERFACE_PROTOCOL_ETH_REP] = { .suffix = "eth-rep",
 215                                            .is_supported = &is_eth_rep_supported },
 216         [MLX5_INTERFACE_PROTOCOL_IB_REP] = { .suffix = "rdma-rep",
 217                                            .is_supported = &is_ib_rep_supported },
 218         [MLX5_INTERFACE_PROTOCOL_MPIB] = { .suffix = "multiport",
 219                                            .is_supported = &is_mp_supported },
 220 };
 221
 222 int mlx5_adev_idx_alloc(void)
 223 {
 224         return ida_alloc(&mlx5_adev_ida, GFP_KERNEL);
 225 }
 226
 227 void mlx5_adev_idx_free(int idx)
 228 {
 229         ida_free(&mlx5_adev_ida, idx);
 230 }
 231
 232 int mlx5_adev_init(struct mlx5_core_dev *dev)
 233 {
 234         struct mlx5_priv *priv = &dev->priv;
 235
 236         priv->adev = kcalloc(ARRAY_SIZE(mlx5_adev_devices),
 237                              sizeof(struct mlx5_adev *), GFP_KERNEL);
 238         if (!priv->adev)
 239                 return -ENOMEM;
 240
 241         return 0;
 242 }
 243
 244 void mlx5_adev_cleanup(struct mlx5_core_dev *dev)
 245 {
 246         struct mlx5_priv *priv = &dev->priv;
 247
 248         kfree(priv->adev);
 249 }
 250
 251 static void adev_release(struct device *dev)
 252 {
 253         struct mlx5_adev *mlx5_adev =
 254                 container_of(dev, struct mlx5_adev, adev.dev);
 255         struct mlx5_priv *priv = &mlx5_adev->mdev->priv;
 256         int idx = mlx5_adev->idx;
 257
 258         kfree(mlx5_adev);
 259         priv->adev[idx] = NULL;
 260 }
 261
 262 static struct mlx5_adev *add_adev(struct mlx5_core_dev *dev, int idx)
 263 {
 264         const char *suffix = mlx5_adev_devices[idx].suffix;
 265         struct auxiliary_device *adev;
 266         struct mlx5_adev *madev;
 267         int ret;
 268
 269         madev = kzalloc(sizeof(*madev), GFP_KERNEL);
 270         if (!madev)
 271                 return ERR_PTR(-ENOMEM);
 272
 273         adev = &madev->adev;
 274         adev->id = dev->priv.adev_idx;
 275         adev->name = suffix;
 276         adev->dev.parent = dev->device;
 277         adev->dev.release = adev_release;
 278         madev->mdev = dev;
 279         madev->idx = idx;
 280
 281         ret = auxiliary_device_init(adev);
 282         if (ret) {
 283                 kfree(madev);
 284                 return ERR_PTR(ret);
 285         }
 286
 287         ret = auxiliary_device_add(adev);
 288         if (ret) {
 289                 auxiliary_device_uninit(adev);
 290                 return ERR_PTR(ret);
 291         }
 292         return madev;
 293 }
 294
 295 static void del_adev(struct auxiliary_device *adev)
 296 {
 297         auxiliary_device_delete(adev);
 298         auxiliary_device_uninit(adev);
 299 }
 300
 301 int mlx5_attach_device(struct mlx5_core_dev *dev)
 302 {
 303         struct mlx5_priv *priv = &dev->priv;
 304         struct auxiliary_device *adev;
 305         struct auxiliary_driver *adrv;
 306         int ret = 0, i;
 307
 308         mutex_lock(&mlx5_intf_mutex);
 309         for (i = 0; i < ARRAY_SIZE(mlx5_adev_devices); i++) {
 310                 if (!priv->adev[i]) {
 311                         bool is_supported = false;
 312
 313                         if (mlx5_adev_devices[i].is_supported)
 314                                 is_supported = mlx5_adev_devices[i].is_supported(dev);
 315
 316                         if (!is_supported)
 317                                 continue;
 318
 319                         priv->adev[i] = add_adev(dev, i);
 320                         if (IS_ERR(priv->adev[i])) {
 321                                 ret = PTR_ERR(priv->adev[i]);
 322                                 priv->adev[i] = NULL;
 323                         }
 324                 } else {
 325                         adev = &priv->adev[i]->adev;
 326                         adrv = to_auxiliary_drv(adev->dev.driver);
 327
 328                         if (adrv->resume)
 329                                 ret = adrv->resume(adev);
 330                 }
 331                 if (ret) {
 332                         mlx5_core_warn(dev, "Device[%d] (%s) failed to load\n",
 333                                        i, mlx5_adev_devices[i].suffix);
 334
 335                         break;
 336                 }
 337         }
 338         mutex_unlock(&mlx5_intf_mutex);
 339         return ret;
 340 }
 341
 342 void mlx5_detach_device(struct mlx5_core_dev *dev)
 343 {
 344         struct mlx5_priv *priv = &dev->priv;
 345         struct auxiliary_device *adev;
 346         struct auxiliary_driver *adrv;
 347         pm_message_t pm = {};
 348         int i;
 349
 350         mutex_lock(&mlx5_intf_mutex);
 351         for (i = ARRAY_SIZE(mlx5_adev_devices) - 1; i >= 0; i--) {
 352                 if (!priv->adev[i])
 353                         continue;
 354
 355                 adev = &priv->adev[i]->adev;
 356                 adrv = to_auxiliary_drv(adev->dev.driver);
 357
 358                 if (adrv->suspend) {
 359                         adrv->suspend(adev, pm);
 360                         continue;
 361                 }
 362
 363                 del_adev(&priv->adev[i]->adev);
 364                 priv->adev[i] = NULL;
 365         }
 366         mutex_unlock(&mlx5_intf_mutex);
 367 }
 368
 369 int mlx5_register_device(struct mlx5_core_dev *dev)
 370 {
 371         int ret;
 372
 373         mutex_lock(&mlx5_intf_mutex);
 374         dev->priv.flags &= ~MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
 375         ret = mlx5_rescan_drivers_locked(dev);
 376         mutex_unlock(&mlx5_intf_mutex);
 377         if (ret)
 378                 mlx5_unregister_device(dev);
 379
 380         return ret;
 381 }
 382
 383 void mlx5_unregister_device(struct mlx5_core_dev *dev)
 384 {
 385         mutex_lock(&mlx5_intf_mutex);
 386         dev->priv.flags |= MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
 387         mlx5_rescan_drivers_locked(dev);
 388         mutex_unlock(&mlx5_intf_mutex);
 389 }
 390
 391 static int add_drivers(struct mlx5_core_dev *dev)
 392 {
 393         struct mlx5_priv *priv = &dev->priv;
 394         int i, ret = 0;
 395
 396         for (i = 0; i < ARRAY_SIZE(mlx5_adev_devices); i++) {
 397                 bool is_supported = false;
 398
 399                 if (priv->adev[i])
 400                         continue;
 401
 402                 if (mlx5_adev_devices[i].is_supported)
 403                         is_supported = mlx5_adev_devices[i].is_supported(dev);
 404
 405                 if (!is_supported)
 406                         continue;
 407
 408                 priv->adev[i] = add_adev(dev, i);
 409                 if (IS_ERR(priv->adev[i])) {
 410                         mlx5_core_warn(dev, "Device[%d] (%s) failed to load\n",
 411                                        i, mlx5_adev_devices[i].suffix);
 412                         /* We continue to rescan drivers and leave to the caller
 413                          * to make decision if to release everything or continue.
 414                          */
 415                         ret = PTR_ERR(priv->adev[i]);
 416                         priv->adev[i] = NULL;
 417                 }
 418         }
 419         return ret;
 420 }
 421
 422 static void delete_drivers(struct mlx5_core_dev *dev)
 423 {
 424         struct mlx5_priv *priv = &dev->priv;
 425         bool delete_all;
 426         int i;
 427
 428         delete_all = priv->flags & MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
 429
 430         for (i = ARRAY_SIZE(mlx5_adev_devices) - 1; i >= 0; i--) {
 431                 bool is_supported = false;
 432
 433                 if (!priv->adev[i])
 434                         continue;
 435
 436                 if (mlx5_adev_devices[i].is_supported && !delete_all)
 437                         is_supported = mlx5_adev_devices[i].is_supported(dev);
 438
 439                 if (is_supported)
 440                         continue;
 441
 442                 del_adev(&priv->adev[i]->adev);
 443                 priv->adev[i] = NULL;
 444         }
 445 }
 446
 447 /* This function is used after mlx5_core_dev is reconfigured.
 448  */
 449 int mlx5_rescan_drivers_locked(struct mlx5_core_dev *dev)
 450 {
 451         struct mlx5_priv *priv = &dev->priv;
 452
 453         lockdep_assert_held(&mlx5_intf_mutex);
 454
 455         delete_drivers(dev);
 456         if (priv->flags & MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV)
 457                 return 0;
 458
 459         return add_drivers(dev);
 460 }
 461
 462 static u32 mlx5_gen_pci_id(const struct mlx5_core_dev *dev)
 463 {
 464         return (u32)((pci_domain_nr(dev->pdev->bus) << 16) |
 465                      (dev->pdev->bus->number << 8) |
 466                      PCI_SLOT(dev->pdev->devfn));
 467 }
 468
 469 static int next_phys_dev(struct device *dev, const void *data)
 470 {
 471         struct mlx5_adev *madev = container_of(dev, struct mlx5_adev, adev.dev);
 472         struct mlx5_core_dev *mdev = madev->mdev;
 473         const struct mlx5_core_dev *curr = data;
 474
 475         if (!mlx5_core_is_pf(mdev))
 476                 return 0;
 477
 478         if (mdev == curr)
 479                 return 0;
 480
 481         if (mlx5_gen_pci_id(mdev) != mlx5_gen_pci_id(curr))
 482                 return 0;
 483
 484         return 1;
 485 }
 486
 487 /* This function is called with two flows:
 488  * 1. During initialization of mlx5_core_dev and we don't need to lock it.
 489  * 2. During LAG configure stage and caller holds &mlx5_intf_mutex.
 490  */
 491 struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
 492 {
 493         struct auxiliary_device *adev;
 494         struct mlx5_adev *madev;
 495
 496         if (!mlx5_core_is_pf(dev))
 497                 return NULL;
 498
 499         adev = auxiliary_find_device(NULL, dev, &next_phys_dev);
 500         if (!adev)
 501                 return NULL;
 502
 503         madev = container_of(adev, struct mlx5_adev, adev);
 504         put_device(&adev->dev);
 505         return madev->mdev;
 506 }
 507
 508 void mlx5_dev_list_lock(void)
 509 {
 510         mutex_lock(&mlx5_intf_mutex);
 511 }
 512 void mlx5_dev_list_unlock(void)
 513 {
 514         mutex_unlock(&mlx5_intf_mutex);
 515 }
 516
 517 int mlx5_dev_list_trylock(void)
 518 {
 519         return mutex_trylock(&mlx5_intf_mutex);
 520 }