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 (MLX5_CAP_GEN(dev, port_type) != MLX5_CAP_PORT_TYPE_ETH)
  62                 return false;
  63
  64         if (!MLX5_CAP_GEN(dev, eth_net_offloads)) {
  65                 mlx5_core_warn(dev, "Missing eth_net_offloads capability\n");
  66                 return false;
  67         }
  68
  69         if (!MLX5_CAP_GEN(dev, nic_flow_table)) {
  70                 mlx5_core_warn(dev, "Missing nic_flow_table capability\n");
  71                 return false;
  72         }
  73
  74         if (!MLX5_CAP_ETH(dev, csum_cap)) {
  75                 mlx5_core_warn(dev, "Missing csum_cap capability\n");
  76                 return false;
  77         }
  78
  79         if (!MLX5_CAP_ETH(dev, max_lso_cap)) {
  80                 mlx5_core_warn(dev, "Missing max_lso_cap capability\n");
  81                 return false;
  82         }
  83
  84         if (!MLX5_CAP_ETH(dev, vlan_cap)) {
  85                 mlx5_core_warn(dev, "Missing vlan_cap capability\n");
  86                 return false;
  87         }
  88
  89         if (!MLX5_CAP_ETH(dev, rss_ind_tbl_cap)) {
  90                 mlx5_core_warn(dev, "Missing rss_ind_tbl_cap capability\n");
  91                 return false;
  92         }
  93
  94         if (MLX5_CAP_FLOWTABLE(dev,
  95                                flow_table_properties_nic_receive.max_ft_level) < 3) {
  96                 mlx5_core_warn(dev, "max_ft_level < 3\n");
  97                 return false;
  98         }
  99
 100         if (!MLX5_CAP_ETH(dev, self_lb_en_modifiable))
 101                 mlx5_core_warn(dev, "Self loop back prevention is not supported\n");
 102         if (!MLX5_CAP_GEN(dev, cq_moderation))
 103                 mlx5_core_warn(dev, "CQ moderation is not supported\n");
 104
 105         return true;
 106 }
 107
 108 static bool is_vnet_supported(struct mlx5_core_dev *dev)
 109 {
 110         if (!IS_ENABLED(CONFIG_MLX5_VDPA_NET))
 111                 return false;
 112
 113         if (mlx5_core_is_pf(dev))
 114                 return false;
 115
 116         if (!(MLX5_CAP_GEN_64(dev, general_obj_types) &
 117               MLX5_GENERAL_OBJ_TYPES_CAP_VIRTIO_NET_Q))
 118                 return false;
 119
 120         if (!(MLX5_CAP_DEV_VDPA_EMULATION(dev, event_mode) &
 121               MLX5_VIRTIO_Q_EVENT_MODE_QP_MODE))
 122                 return false;
 123
 124         if (!MLX5_CAP_DEV_VDPA_EMULATION(dev, eth_frame_offload_type))
 125                 return false;
 126
 127         return true;
 128 }
 129
 130 static bool is_ib_rep_supported(struct mlx5_core_dev *dev)
 131 {
 132         if (!IS_ENABLED(CONFIG_MLX5_INFINIBAND))
 133                 return false;
 134
 135         if (dev->priv.flags & MLX5_PRIV_FLAGS_DISABLE_IB_ADEV)
 136                 return false;
 137
 138         if (!is_eth_rep_supported(dev))
 139                 return false;
 140
 141         if (!MLX5_ESWITCH_MANAGER(dev))
 142                 return false;
 143
 144         if (!is_mdev_switchdev_mode(dev))
 145                 return false;
 146
 147         if (mlx5_core_mp_enabled(dev))
 148                 return false;
 149
 150         return true;
 151 }
 152
 153 static bool is_mp_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_ib_rep_supported(dev))
 162                 return false;
 163
 164         if (MLX5_CAP_GEN(dev, port_type) != MLX5_CAP_PORT_TYPE_ETH)
 165                 return false;
 166
 167         if (!mlx5_core_is_mp_slave(dev))
 168                 return false;
 169
 170         return true;
 171 }
 172
 173 static bool is_ib_supported(struct mlx5_core_dev *dev)
 174 {
 175         if (!IS_ENABLED(CONFIG_MLX5_INFINIBAND))
 176                 return false;
 177
 178         if (dev->priv.flags & MLX5_PRIV_FLAGS_DISABLE_IB_ADEV)
 179                 return false;
 180
 181         if (is_ib_rep_supported(dev))
 182                 return false;
 183
 184         if (is_mp_supported(dev))
 185                 return false;
 186
 187         return true;
 188 }
 189
 190 enum {
 191         MLX5_INTERFACE_PROTOCOL_ETH,
 192         MLX5_INTERFACE_PROTOCOL_ETH_REP,
 193
 194         MLX5_INTERFACE_PROTOCOL_IB,
 195         MLX5_INTERFACE_PROTOCOL_IB_REP,
 196         MLX5_INTERFACE_PROTOCOL_MPIB,
 197
 198         MLX5_INTERFACE_PROTOCOL_VNET,
 199 };
 200
 201 static const struct mlx5_adev_device {
 202         const char *suffix;
 203         bool (*is_supported)(struct mlx5_core_dev *dev);
 204 } mlx5_adev_devices[] = {
 205         [MLX5_INTERFACE_PROTOCOL_VNET] = { .suffix = "vnet",
 206                                            .is_supported = &is_vnet_supported },
 207         [MLX5_INTERFACE_PROTOCOL_IB] = { .suffix = "rdma",
 208                                          .is_supported = &is_ib_supported },
 209         [MLX5_INTERFACE_PROTOCOL_ETH] = { .suffix = "eth",
 210                                           .is_supported = &is_eth_supported },
 211         [MLX5_INTERFACE_PROTOCOL_ETH_REP] = { .suffix = "eth-rep",
 212                                            .is_supported = &is_eth_rep_supported },
 213         [MLX5_INTERFACE_PROTOCOL_IB_REP] = { .suffix = "rdma-rep",
 214                                            .is_supported = &is_ib_rep_supported },
 215         [MLX5_INTERFACE_PROTOCOL_MPIB] = { .suffix = "multiport",
 216                                            .is_supported = &is_mp_supported },
 217 };
 218
 219 int mlx5_adev_idx_alloc(void)
 220 {
 221         return ida_alloc(&mlx5_adev_ida, GFP_KERNEL);
 222 }
 223
 224 void mlx5_adev_idx_free(int idx)
 225 {
 226         ida_free(&mlx5_adev_ida, idx);
 227 }
 228
 229 int mlx5_adev_init(struct mlx5_core_dev *dev)
 230 {
 231         struct mlx5_priv *priv = &dev->priv;
 232
 233         priv->adev = kcalloc(ARRAY_SIZE(mlx5_adev_devices),
 234                              sizeof(struct mlx5_adev *), GFP_KERNEL);
 235         if (!priv->adev)
 236                 return -ENOMEM;
 237
 238         return 0;
 239 }
 240
 241 void mlx5_adev_cleanup(struct mlx5_core_dev *dev)
 242 {
 243         struct mlx5_priv *priv = &dev->priv;
 244
 245         kfree(priv->adev);
 246 }
 247
 248 static void adev_release(struct device *dev)
 249 {
 250         struct mlx5_adev *mlx5_adev =
 251                 container_of(dev, struct mlx5_adev, adev.dev);
 252         struct mlx5_priv *priv = &mlx5_adev->mdev->priv;
 253         int idx = mlx5_adev->idx;
 254
 255         kfree(mlx5_adev);
 256         priv->adev[idx] = NULL;
 257 }
 258
 259 static struct mlx5_adev *add_adev(struct mlx5_core_dev *dev, int idx)
 260 {
 261         const char *suffix = mlx5_adev_devices[idx].suffix;
 262         struct auxiliary_device *adev;
 263         struct mlx5_adev *madev;
 264         int ret;
 265
 266         madev = kzalloc(sizeof(*madev), GFP_KERNEL);
 267         if (!madev)
 268                 return ERR_PTR(-ENOMEM);
 269
 270         adev = &madev->adev;
 271         adev->id = dev->priv.adev_idx;
 272         adev->name = suffix;
 273         adev->dev.parent = dev->device;
 274         adev->dev.release = adev_release;
 275         madev->mdev = dev;
 276         madev->idx = idx;
 277
 278         ret = auxiliary_device_init(adev);
 279         if (ret) {
 280                 kfree(madev);
 281                 return ERR_PTR(ret);
 282         }
 283
 284         ret = auxiliary_device_add(adev);
 285         if (ret) {
 286                 auxiliary_device_uninit(adev);
 287                 return ERR_PTR(ret);
 288         }
 289         return madev;
 290 }
 291
 292 static void del_adev(struct auxiliary_device *adev)
 293 {
 294         auxiliary_device_delete(adev);
 295         auxiliary_device_uninit(adev);
 296 }
 297
 298 int mlx5_attach_device(struct mlx5_core_dev *dev)
 299 {
 300         struct mlx5_priv *priv = &dev->priv;
 301         struct auxiliary_device *adev;
 302         struct auxiliary_driver *adrv;
 303         int ret = 0, i;
 304
 305         mutex_lock(&mlx5_intf_mutex);
 306         priv->flags &= ~MLX5_PRIV_FLAGS_DETACH;
 307         for (i = 0; i < ARRAY_SIZE(mlx5_adev_devices); i++) {
 308                 if (!priv->adev[i]) {
 309                         bool is_supported = false;
 310
 311                         if (mlx5_adev_devices[i].is_supported)
 312                                 is_supported = mlx5_adev_devices[i].is_supported(dev);
 313
 314                         if (!is_supported)
 315                                 continue;
 316
 317                         priv->adev[i] = add_adev(dev, i);
 318                         if (IS_ERR(priv->adev[i])) {
 319                                 ret = PTR_ERR(priv->adev[i]);
 320                                 priv->adev[i] = NULL;
 321                         }
 322                 } else {
 323                         adev = &priv->adev[i]->adev;
 324
 325                         /* Pay attention that this is not PCI driver that
 326                          * mlx5_core_dev is connected, but auxiliary driver.
 327                          *
 328                          * Here we can race of module unload with devlink
 329                          * reload, but we don't need to take extra lock because
 330                          * we are holding global mlx5_intf_mutex.
 331                          */
 332                         if (!adev->dev.driver)
 333                                 continue;
 334                         adrv = to_auxiliary_drv(adev->dev.driver);
 335
 336                         if (adrv->resume)
 337                                 ret = adrv->resume(adev);
 338                 }
 339                 if (ret) {
 340                         mlx5_core_warn(dev, "Device[%d] (%s) failed to load\n",
 341                                        i, mlx5_adev_devices[i].suffix);
 342
 343                         break;
 344                 }
 345         }
 346         mutex_unlock(&mlx5_intf_mutex);
 347         return ret;
 348 }
 349
 350 void mlx5_detach_device(struct mlx5_core_dev *dev)
 351 {
 352         struct mlx5_priv *priv = &dev->priv;
 353         struct auxiliary_device *adev;
 354         struct auxiliary_driver *adrv;
 355         pm_message_t pm = {};
 356         int i;
 357
 358         mutex_lock(&mlx5_intf_mutex);
 359         for (i = ARRAY_SIZE(mlx5_adev_devices) - 1; i >= 0; i--) {
 360                 if (!priv->adev[i])
 361                         continue;
 362
 363                 adev = &priv->adev[i]->adev;
 364                 /* Auxiliary driver was unbind manually through sysfs */
 365                 if (!adev->dev.driver)
 366                         goto skip_suspend;
 367
 368                 adrv = to_auxiliary_drv(adev->dev.driver);
 369
 370                 if (adrv->suspend) {
 371                         adrv->suspend(adev, pm);
 372                         continue;
 373                 }
 374
 375 skip_suspend:
 376                 del_adev(&priv->adev[i]->adev);
 377                 priv->adev[i] = NULL;
 378         }
 379         priv->flags |= MLX5_PRIV_FLAGS_DETACH;
 380         mutex_unlock(&mlx5_intf_mutex);
 381 }
 382
 383 int mlx5_register_device(struct mlx5_core_dev *dev)
 384 {
 385         int ret;
 386
 387         mutex_lock(&mlx5_intf_mutex);
 388         dev->priv.flags &= ~MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
 389         ret = mlx5_rescan_drivers_locked(dev);
 390         mutex_unlock(&mlx5_intf_mutex);
 391         if (ret)
 392                 mlx5_unregister_device(dev);
 393
 394         return ret;
 395 }
 396
 397 void mlx5_unregister_device(struct mlx5_core_dev *dev)
 398 {
 399         mutex_lock(&mlx5_intf_mutex);
 400         dev->priv.flags |= MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
 401         mlx5_rescan_drivers_locked(dev);
 402         mutex_unlock(&mlx5_intf_mutex);
 403 }
 404
 405 static int add_drivers(struct mlx5_core_dev *dev)
 406 {
 407         struct mlx5_priv *priv = &dev->priv;
 408         int i, ret = 0;
 409
 410         for (i = 0; i < ARRAY_SIZE(mlx5_adev_devices); i++) {
 411                 bool is_supported = false;
 412
 413                 if (priv->adev[i])
 414                         continue;
 415
 416                 if (mlx5_adev_devices[i].is_supported)
 417                         is_supported = mlx5_adev_devices[i].is_supported(dev);
 418
 419                 if (!is_supported)
 420                         continue;
 421
 422                 priv->adev[i] = add_adev(dev, i);
 423                 if (IS_ERR(priv->adev[i])) {
 424                         mlx5_core_warn(dev, "Device[%d] (%s) failed to load\n",
 425                                        i, mlx5_adev_devices[i].suffix);
 426                         /* We continue to rescan drivers and leave to the caller
 427                          * to make decision if to release everything or continue.
 428                          */
 429                         ret = PTR_ERR(priv->adev[i]);
 430                         priv->adev[i] = NULL;
 431                 }
 432         }
 433         return ret;
 434 }
 435
 436 static void delete_drivers(struct mlx5_core_dev *dev)
 437 {
 438         struct mlx5_priv *priv = &dev->priv;
 439         bool delete_all;
 440         int i;
 441
 442         delete_all = priv->flags & MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
 443
 444         for (i = ARRAY_SIZE(mlx5_adev_devices) - 1; i >= 0; i--) {
 445                 bool is_supported = false;
 446
 447                 if (!priv->adev[i])
 448                         continue;
 449
 450                 if (mlx5_adev_devices[i].is_supported && !delete_all)
 451                         is_supported = mlx5_adev_devices[i].is_supported(dev);
 452
 453                 if (is_supported)
 454                         continue;
 455
 456                 del_adev(&priv->adev[i]->adev);
 457                 priv->adev[i] = NULL;
 458         }
 459 }
 460
 461 /* This function is used after mlx5_core_dev is reconfigured.
 462  */
 463 int mlx5_rescan_drivers_locked(struct mlx5_core_dev *dev)
 464 {
 465         struct mlx5_priv *priv = &dev->priv;
 466
 467         lockdep_assert_held(&mlx5_intf_mutex);
 468         if (priv->flags & MLX5_PRIV_FLAGS_DETACH)
 469                 return 0;
 470
 471         delete_drivers(dev);
 472         if (priv->flags & MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV)
 473                 return 0;
 474
 475         return add_drivers(dev);
 476 }
 477
 478 static u32 mlx5_gen_pci_id(const struct mlx5_core_dev *dev)
 479 {
 480         return (u32)((pci_domain_nr(dev->pdev->bus) << 16) |
 481                      (dev->pdev->bus->number << 8) |
 482                      PCI_SLOT(dev->pdev->devfn));
 483 }
 484
 485 static int next_phys_dev(struct device *dev, const void *data)
 486 {
 487         struct mlx5_adev *madev = container_of(dev, struct mlx5_adev, adev.dev);
 488         struct mlx5_core_dev *mdev = madev->mdev;
 489         const struct mlx5_core_dev *curr = data;
 490
 491         if (!mlx5_core_is_pf(mdev))
 492                 return 0;
 493
 494         if (mdev == curr)
 495                 return 0;
 496
 497         if (mlx5_gen_pci_id(mdev) != mlx5_gen_pci_id(curr))
 498                 return 0;
 499
 500         return 1;
 501 }
 502
 503 /* This function is called with two flows:
 504  * 1. During initialization of mlx5_core_dev and we don't need to lock it.
 505  * 2. During LAG configure stage and caller holds &mlx5_intf_mutex.
 506  */
 507 struct mlx5_core_dev *mlx5_get_next_phys_dev(struct mlx5_core_dev *dev)
 508 {
 509         struct auxiliary_device *adev;
 510         struct mlx5_adev *madev;
 511
 512         if (!mlx5_core_is_pf(dev))
 513                 return NULL;
 514
 515         adev = auxiliary_find_device(NULL, dev, &next_phys_dev);
 516         if (!adev)
 517                 return NULL;
 518
 519         madev = container_of(adev, struct mlx5_adev, adev);
 520         put_device(&adev->dev);
 521         return madev->mdev;
 522 }
 523
 524 void mlx5_dev_list_lock(void)
 525 {
 526         mutex_lock(&mlx5_intf_mutex);
 527 }
 528 void mlx5_dev_list_unlock(void)
 529 {
 530         mutex_unlock(&mlx5_intf_mutex);
 531 }
 532
 533 int mlx5_dev_list_trylock(void)
 534 {
 535         return mutex_trylock(&mlx5_intf_mutex);
 536 }