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

   1 /*
   2  * Copyright (c) 2016, 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/netdevice.h>
  34 #include <linux/mlx5/driver.h>
  35 #include <linux/mlx5/vport.h>
  36 #include "mlx5_core.h"
  37
  38 enum {
  39         MLX5_LAG_FLAG_BONDED = 1 << 0,
  40 };
  41
  42 struct lag_func {
  43         struct mlx5_core_dev *dev;
  44         struct net_device    *netdev;
  45 };
  46
  47 /* Used for collection of netdev event info. */
  48 struct lag_tracker {
  49         enum   netdev_lag_tx_type           tx_type;
  50         struct netdev_lag_lower_state_info  netdev_state[MLX5_MAX_PORTS];
  51         bool is_bonded;
  52 };
  53
  54 /* LAG data of a ConnectX card.
  55  * It serves both its phys functions.
  56  */
  57 struct mlx5_lag {
  58         u8                        flags;
  59         u8                        v2p_map[MLX5_MAX_PORTS];
  60         struct lag_func           pf[MLX5_MAX_PORTS];
  61         struct lag_tracker        tracker;
  62         struct delayed_work       bond_work;
  63         struct notifier_block     nb;
  64 };
  65
  66 /* General purpose, use for short periods of time.
  67  * Beware of lock dependencies (preferably, no locks should be acquired
  68  * under it).
  69  */
  70 static DEFINE_MUTEX(lag_mutex);
  71
  72 static int mlx5_cmd_create_lag(struct mlx5_core_dev *dev, u8 remap_port1,
  73                                u8 remap_port2)
  74 {
  75         u32   in[MLX5_ST_SZ_DW(create_lag_in)]   = {0};
  76         u32   out[MLX5_ST_SZ_DW(create_lag_out)] = {0};
  77         void *lag_ctx = MLX5_ADDR_OF(create_lag_in, in, ctx);
  78
  79         MLX5_SET(create_lag_in, in, opcode, MLX5_CMD_OP_CREATE_LAG);
  80
  81         MLX5_SET(lagc, lag_ctx, tx_remap_affinity_1, remap_port1);
  82         MLX5_SET(lagc, lag_ctx, tx_remap_affinity_2, remap_port2);
  83
  84         return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
  85 }
  86
  87 static int mlx5_cmd_modify_lag(struct mlx5_core_dev *dev, u8 remap_port1,
  88                                u8 remap_port2)
  89 {
  90         u32   in[MLX5_ST_SZ_DW(modify_lag_in)]   = {0};
  91         u32   out[MLX5_ST_SZ_DW(modify_lag_out)] = {0};
  92         void *lag_ctx = MLX5_ADDR_OF(modify_lag_in, in, ctx);
  93
  94         MLX5_SET(modify_lag_in, in, opcode, MLX5_CMD_OP_MODIFY_LAG);
  95         MLX5_SET(modify_lag_in, in, field_select, 0x1);
  96
  97         MLX5_SET(lagc, lag_ctx, tx_remap_affinity_1, remap_port1);
  98         MLX5_SET(lagc, lag_ctx, tx_remap_affinity_2, remap_port2);
  99
 100         return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
 101 }
 102
 103 static int mlx5_cmd_destroy_lag(struct mlx5_core_dev *dev)
 104 {
 105         u32  in[MLX5_ST_SZ_DW(destroy_lag_in)]  = {0};
 106         u32 out[MLX5_ST_SZ_DW(destroy_lag_out)] = {0};
 107
 108         MLX5_SET(destroy_lag_in, in, opcode, MLX5_CMD_OP_DESTROY_LAG);
 109
 110         return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
 111 }
 112
 113 int mlx5_cmd_create_vport_lag(struct mlx5_core_dev *dev)
 114 {
 115         u32  in[MLX5_ST_SZ_DW(create_vport_lag_in)]  = {0};
 116         u32 out[MLX5_ST_SZ_DW(create_vport_lag_out)] = {0};
 117
 118         MLX5_SET(create_vport_lag_in, in, opcode, MLX5_CMD_OP_CREATE_VPORT_LAG);
 119
 120         return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
 121 }
 122 EXPORT_SYMBOL(mlx5_cmd_create_vport_lag);
 123
 124 int mlx5_cmd_destroy_vport_lag(struct mlx5_core_dev *dev)
 125 {
 126         u32  in[MLX5_ST_SZ_DW(destroy_vport_lag_in)]  = {0};
 127         u32 out[MLX5_ST_SZ_DW(destroy_vport_lag_out)] = {0};
 128
 129         MLX5_SET(destroy_vport_lag_in, in, opcode, MLX5_CMD_OP_DESTROY_VPORT_LAG);
 130
 131         return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
 132 }
 133 EXPORT_SYMBOL(mlx5_cmd_destroy_vport_lag);
 134
 135 static struct mlx5_lag *mlx5_lag_dev_get(struct mlx5_core_dev *dev)
 136 {
 137         return dev->priv.lag;
 138 }
 139
 140 static int mlx5_lag_dev_get_netdev_idx(struct mlx5_lag *ldev,
 141                                        struct net_device *ndev)
 142 {
 143         int i;
 144
 145         for (i = 0; i < MLX5_MAX_PORTS; i++)
 146                 if (ldev->pf[i].netdev == ndev)
 147                         return i;
 148
 149         return -1;
 150 }
 151
 152 static bool mlx5_lag_is_bonded(struct mlx5_lag *ldev)
 153 {
 154         return !!(ldev->flags & MLX5_LAG_FLAG_BONDED);
 155 }
 156
 157 static void mlx5_infer_tx_affinity_mapping(struct lag_tracker *tracker,
 158                                            u8 *port1, u8 *port2)
 159 {
 160         if (tracker->tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) {
 161                 if (tracker->netdev_state[0].tx_enabled) {
 162                         *port1 = 1;
 163                         *port2 = 1;
 164                 } else {
 165                         *port1 = 2;
 166                         *port2 = 2;
 167                 }
 168         } else {
 169                 *port1 = 1;
 170                 *port2 = 2;
 171                 if (!tracker->netdev_state[0].link_up)
 172                         *port1 = 2;
 173                 else if (!tracker->netdev_state[1].link_up)
 174                         *port2 = 1;
 175         }
 176 }
 177
 178 static void mlx5_activate_lag(struct mlx5_lag *ldev,
 179                               struct lag_tracker *tracker)
 180 {
 181         struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
 182         int err;
 183
 184         ldev->flags |= MLX5_LAG_FLAG_BONDED;
 185
 186         mlx5_infer_tx_affinity_mapping(tracker, &ldev->v2p_map[0],
 187                                        &ldev->v2p_map[1]);
 188
 189         err = mlx5_cmd_create_lag(dev0, ldev->v2p_map[0], ldev->v2p_map[1]);
 190         if (err)
 191                 mlx5_core_err(dev0,
 192                               "Failed to create LAG (%d)\n",
 193                               err);
 194 }
 195
 196 static void mlx5_deactivate_lag(struct mlx5_lag *ldev)
 197 {
 198         struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
 199         int err;
 200
 201         ldev->flags &= ~MLX5_LAG_FLAG_BONDED;
 202
 203         err = mlx5_cmd_destroy_lag(dev0);
 204         if (err)
 205                 mlx5_core_err(dev0,
 206                               "Failed to destroy LAG (%d)\n",
 207                               err);
 208 }
 209
 210 static void mlx5_do_bond(struct mlx5_lag *ldev)
 211 {
 212         struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
 213         struct mlx5_core_dev *dev1 = ldev->pf[1].dev;
 214         struct lag_tracker tracker;
 215         u8 v2p_port1, v2p_port2;
 216         int i, err;
 217
 218         if (!dev0 || !dev1)
 219                 return;
 220
 221         mutex_lock(&lag_mutex);
 222         tracker = ldev->tracker;
 223         mutex_unlock(&lag_mutex);
 224
 225         if (tracker.is_bonded && !mlx5_lag_is_bonded(ldev)) {
 226                 if (mlx5_sriov_is_enabled(dev0) ||
 227                     mlx5_sriov_is_enabled(dev1)) {
 228                         mlx5_core_warn(dev0, "LAG is not supported with SRIOV");
 229                         return;
 230                 }
 231
 232                 for (i = 0; i < MLX5_MAX_PORTS; i++)
 233                         mlx5_remove_dev_by_protocol(ldev->pf[i].dev,
 234                                                     MLX5_INTERFACE_PROTOCOL_IB);
 235
 236                 mlx5_activate_lag(ldev, &tracker);
 237
 238                 mlx5_add_dev_by_protocol(dev0, MLX5_INTERFACE_PROTOCOL_IB);
 239                 mlx5_nic_vport_enable_roce(dev1);
 240         } else if (tracker.is_bonded && mlx5_lag_is_bonded(ldev)) {
 241                 mlx5_infer_tx_affinity_mapping(&tracker, &v2p_port1,
 242                                                &v2p_port2);
 243
 244                 if ((v2p_port1 != ldev->v2p_map[0]) ||
 245                     (v2p_port2 != ldev->v2p_map[1])) {
 246                         ldev->v2p_map[0] = v2p_port1;
 247                         ldev->v2p_map[1] = v2p_port2;
 248
 249                         err = mlx5_cmd_modify_lag(dev0, v2p_port1, v2p_port2);
 250                         if (err)
 251                                 mlx5_core_err(dev0,
 252                                               "Failed to modify LAG (%d)\n",
 253                                               err);
 254                 }
 255         } else if (!tracker.is_bonded && mlx5_lag_is_bonded(ldev)) {
 256                 mlx5_remove_dev_by_protocol(dev0, MLX5_INTERFACE_PROTOCOL_IB);
 257                 mlx5_nic_vport_disable_roce(dev1);
 258
 259                 mlx5_deactivate_lag(ldev);
 260
 261                 for (i = 0; i < MLX5_MAX_PORTS; i++)
 262                         if (ldev->pf[i].dev)
 263                                 mlx5_add_dev_by_protocol(ldev->pf[i].dev,
 264                                                          MLX5_INTERFACE_PROTOCOL_IB);
 265         }
 266 }
 267
 268 static void mlx5_queue_bond_work(struct mlx5_lag *ldev, unsigned long delay)
 269 {
 270         schedule_delayed_work(&ldev->bond_work, delay);
 271 }
 272
 273 static void mlx5_do_bond_work(struct work_struct *work)
 274 {
 275         struct delayed_work *delayed_work = to_delayed_work(work);
 276         struct mlx5_lag *ldev = container_of(delayed_work, struct mlx5_lag,
 277                                              bond_work);
 278         int status;
 279
 280         status = mlx5_dev_list_trylock();
 281         if (!status) {
 282                 /* 1 sec delay. */
 283                 mlx5_queue_bond_work(ldev, HZ);
 284                 return;
 285         }
 286
 287         mlx5_do_bond(ldev);
 288         mlx5_dev_list_unlock();
 289 }
 290
 291 static int mlx5_handle_changeupper_event(struct mlx5_lag *ldev,
 292                                          struct lag_tracker *tracker,
 293                                          struct net_device *ndev,
 294                                          struct netdev_notifier_changeupper_info *info)
 295 {
 296         struct net_device *upper = info->upper_dev, *ndev_tmp;
 297         struct netdev_lag_upper_info *lag_upper_info;
 298         bool is_bonded;
 299         int bond_status = 0;
 300         int num_slaves = 0;
 301         int idx;
 302
 303         if (!netif_is_lag_master(upper))
 304                 return 0;
 305
 306         lag_upper_info = info->upper_info;
 307
 308         /* The event may still be of interest if the slave does not belong to
 309          * us, but is enslaved to a master which has one or more of our netdevs
 310          * as slaves (e.g., if a new slave is added to a master that bonds two
 311          * of our netdevs, we should unbond).
 312          */
 313         rcu_read_lock();
 314         for_each_netdev_in_bond_rcu(upper, ndev_tmp) {
 315                 idx = mlx5_lag_dev_get_netdev_idx(ldev, ndev_tmp);
 316                 if (idx > -1)
 317                         bond_status |= (1 << idx);
 318
 319                 num_slaves++;
 320         }
 321         rcu_read_unlock();
 322
 323         /* None of this lagdev's netdevs are slaves of this master. */
 324         if (!(bond_status & 0x3))
 325                 return 0;
 326
 327         if (lag_upper_info)
 328                 tracker->tx_type = lag_upper_info->tx_type;
 329
 330         /* Determine bonding status:
 331          * A device is considered bonded if both its physical ports are slaves
 332          * of the same lag master, and only them.
 333          * Lag mode must be activebackup or hash.
 334          */
 335         is_bonded = (num_slaves == MLX5_MAX_PORTS) &&
 336                     (bond_status == 0x3) &&
 337                     ((tracker->tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) ||
 338                      (tracker->tx_type == NETDEV_LAG_TX_TYPE_HASH));
 339
 340         if (tracker->is_bonded != is_bonded) {
 341                 tracker->is_bonded = is_bonded;
 342                 return 1;
 343         }
 344
 345         return 0;
 346 }
 347
 348 static int mlx5_handle_changelowerstate_event(struct mlx5_lag *ldev,
 349                                               struct lag_tracker *tracker,
 350                                               struct net_device *ndev,
 351                                               struct netdev_notifier_changelowerstate_info *info)
 352 {
 353         struct netdev_lag_lower_state_info *lag_lower_info;
 354         int idx;
 355
 356         if (!netif_is_lag_port(ndev))
 357                 return 0;
 358
 359         idx = mlx5_lag_dev_get_netdev_idx(ldev, ndev);
 360         if (idx == -1)
 361                 return 0;
 362
 363         /* This information is used to determine virtual to physical
 364          * port mapping.
 365          */
 366         lag_lower_info = info->lower_state_info;
 367         if (!lag_lower_info)
 368                 return 0;
 369
 370         tracker->netdev_state[idx] = *lag_lower_info;
 371
 372         return 1;
 373 }
 374
 375 static int mlx5_lag_netdev_event(struct notifier_block *this,
 376                                  unsigned long event, void *ptr)
 377 {
 378         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
 379         struct lag_tracker tracker;
 380         struct mlx5_lag *ldev;
 381         int changed = 0;
 382
 383         if (!net_eq(dev_net(ndev), &init_net))
 384                 return NOTIFY_DONE;
 385
 386         if ((event != NETDEV_CHANGEUPPER) && (event != NETDEV_CHANGELOWERSTATE))
 387                 return NOTIFY_DONE;
 388
 389         ldev    = container_of(this, struct mlx5_lag, nb);
 390         tracker = ldev->tracker;
 391
 392         switch (event) {
 393         case NETDEV_CHANGEUPPER:
 394                 changed = mlx5_handle_changeupper_event(ldev, &tracker, ndev,
 395                                                         ptr);
 396                 break;
 397         case NETDEV_CHANGELOWERSTATE:
 398                 changed = mlx5_handle_changelowerstate_event(ldev, &tracker,
 399                                                              ndev, ptr);
 400                 break;
 401         }
 402
 403         mutex_lock(&lag_mutex);
 404         ldev->tracker = tracker;
 405         mutex_unlock(&lag_mutex);
 406
 407         if (changed)
 408                 mlx5_queue_bond_work(ldev, 0);
 409
 410         return NOTIFY_DONE;
 411 }
 412
 413 static struct mlx5_lag *mlx5_lag_dev_alloc(void)
 414 {
 415         struct mlx5_lag *ldev;
 416
 417         ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
 418         if (!ldev)
 419                 return NULL;
 420
 421         INIT_DELAYED_WORK(&ldev->bond_work, mlx5_do_bond_work);
 422
 423         return ldev;
 424 }
 425
 426 static void mlx5_lag_dev_free(struct mlx5_lag *ldev)
 427 {
 428         kfree(ldev);
 429 }
 430
 431 static void mlx5_lag_dev_add_pf(struct mlx5_lag *ldev,
 432                                 struct mlx5_core_dev *dev,
 433                                 struct net_device *netdev)
 434 {
 435         unsigned int fn = PCI_FUNC(dev->pdev->devfn);
 436
 437         if (fn >= MLX5_MAX_PORTS)
 438                 return;
 439
 440         mutex_lock(&lag_mutex);
 441         ldev->pf[fn].dev    = dev;
 442         ldev->pf[fn].netdev = netdev;
 443         ldev->tracker.netdev_state[fn].link_up = 0;
 444         ldev->tracker.netdev_state[fn].tx_enabled = 0;
 445
 446         dev->priv.lag = ldev;
 447         mutex_unlock(&lag_mutex);
 448 }
 449
 450 static void mlx5_lag_dev_remove_pf(struct mlx5_lag *ldev,
 451                                    struct mlx5_core_dev *dev)
 452 {
 453         int i;
 454
 455         for (i = 0; i < MLX5_MAX_PORTS; i++)
 456                 if (ldev->pf[i].dev == dev)
 457                         break;
 458
 459         if (i == MLX5_MAX_PORTS)
 460                 return;
 461
 462         mutex_lock(&lag_mutex);
 463         memset(&ldev->pf[i], 0, sizeof(*ldev->pf));
 464
 465         dev->priv.lag = NULL;
 466         mutex_unlock(&lag_mutex);
 467 }
 468
 469
 470 /* Must be called with intf_mutex held */
 471 void mlx5_lag_add(struct mlx5_core_dev *dev, struct net_device *netdev)
 472 {
 473         struct mlx5_lag *ldev = NULL;
 474         struct mlx5_core_dev *tmp_dev;
 475
 476         if (!MLX5_CAP_GEN(dev, vport_group_manager) ||
 477             !MLX5_CAP_GEN(dev, lag_master) ||
 478             (MLX5_CAP_GEN(dev, num_lag_ports) != MLX5_MAX_PORTS))
 479                 return;
 480
 481         tmp_dev = mlx5_get_next_phys_dev(dev);
 482         if (tmp_dev)
 483                 ldev = tmp_dev->priv.lag;
 484
 485         if (!ldev) {
 486                 ldev = mlx5_lag_dev_alloc();
 487                 if (!ldev) {
 488                         mlx5_core_err(dev, "Failed to alloc lag dev\n");
 489                         return;
 490                 }
 491         }
 492
 493         mlx5_lag_dev_add_pf(ldev, dev, netdev);
 494
 495         if (!ldev->nb.notifier_call) {
 496                 ldev->nb.notifier_call = mlx5_lag_netdev_event;
 497                 if (register_netdevice_notifier(&ldev->nb)) {
 498                         ldev->nb.notifier_call = NULL;
 499                         mlx5_core_err(dev, "Failed to register LAG netdev notifier\n");
 500                 }
 501         }
 502 }
 503
 504 /* Must be called with intf_mutex held */
 505 void mlx5_lag_remove(struct mlx5_core_dev *dev)
 506 {
 507         struct mlx5_lag *ldev;
 508         int i;
 509
 510         ldev = mlx5_lag_dev_get(dev);
 511         if (!ldev)
 512                 return;
 513
 514         if (mlx5_lag_is_bonded(ldev))
 515                 mlx5_deactivate_lag(ldev);
 516
 517         mlx5_lag_dev_remove_pf(ldev, dev);
 518
 519         for (i = 0; i < MLX5_MAX_PORTS; i++)
 520                 if (ldev->pf[i].dev)
 521                         break;
 522
 523         if (i == MLX5_MAX_PORTS) {
 524                 if (ldev->nb.notifier_call)
 525                         unregister_netdevice_notifier(&ldev->nb);
 526                 cancel_delayed_work_sync(&ldev->bond_work);
 527                 mlx5_lag_dev_free(ldev);
 528         }
 529 }
 530
 531 bool mlx5_lag_is_active(struct mlx5_core_dev *dev)
 532 {
 533         struct mlx5_lag *ldev;
 534         bool res;
 535
 536         mutex_lock(&lag_mutex);
 537         ldev = mlx5_lag_dev_get(dev);
 538         res  = ldev && mlx5_lag_is_bonded(ldev);
 539         mutex_unlock(&lag_mutex);
 540
 541         return res;
 542 }
 543 EXPORT_SYMBOL(mlx5_lag_is_active);
 544
 545 struct net_device *mlx5_lag_get_roce_netdev(struct mlx5_core_dev *dev)
 546 {
 547         struct net_device *ndev = NULL;
 548         struct mlx5_lag *ldev;
 549
 550         mutex_lock(&lag_mutex);
 551         ldev = mlx5_lag_dev_get(dev);
 552
 553         if (!(ldev && mlx5_lag_is_bonded(ldev)))
 554                 goto unlock;
 555
 556         if (ldev->tracker.tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) {
 557                 ndev = ldev->tracker.netdev_state[0].tx_enabled ?
 558                        ldev->pf[0].netdev : ldev->pf[1].netdev;
 559         } else {
 560                 ndev = ldev->pf[0].netdev;
 561         }
 562         if (ndev)
 563                 dev_hold(ndev);
 564
 565 unlock:
 566         mutex_unlock(&lag_mutex);
 567
 568         return ndev;
 569 }
 570 EXPORT_SYMBOL(mlx5_lag_get_roce_netdev);
 571
 572 bool mlx5_lag_intf_add(struct mlx5_interface *intf, struct mlx5_priv *priv)
 573 {
 574         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev,
 575                                                  priv);
 576         struct mlx5_lag *ldev;
 577
 578         if (intf->protocol != MLX5_INTERFACE_PROTOCOL_IB)
 579                 return true;
 580
 581         ldev = mlx5_lag_dev_get(dev);
 582         if (!ldev || !mlx5_lag_is_bonded(ldev) || ldev->pf[0].dev == dev)
 583                 return true;
 584
 585         /* If bonded, we do not add an IB device for PF1. */
 586         return false;
 587 }
 588