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

DEFINITIONS

1. mlx5_cmd_create_lag
2. mlx5_cmd_modify_lag
3. mlx5_cmd_destroy_lag
4. mlx5_cmd_create_vport_lag
5. mlx5_cmd_destroy_vport_lag
6. mlx5_cmd_query_cong_counter
7. mlx5_lag_dev_get_netdev_idx
8. __mlx5_lag_is_roce
9. __mlx5_lag_is_sriov
10. mlx5_infer_tx_affinity_mapping
11. mlx5_modify_lag
12. mlx5_create_lag
13. mlx5_activate_lag
14. mlx5_deactivate_lag
15. mlx5_lag_check_prereq
16. mlx5_lag_add_ib_devices
17. mlx5_lag_remove_ib_devices
18. mlx5_do_bond
19. mlx5_queue_bond_work
20. mlx5_do_bond_work
21. mlx5_handle_changeupper_event
22. mlx5_handle_changelowerstate_event
23. mlx5_lag_netdev_event
24. mlx5_lag_dev_alloc
25. mlx5_lag_dev_free
26. mlx5_lag_dev_add_pf
27. mlx5_lag_dev_remove_pf
28. mlx5_lag_add
29. mlx5_lag_remove
30. mlx5_lag_is_roce
31. mlx5_lag_is_active
32. mlx5_lag_is_sriov
33. mlx5_lag_update
34. mlx5_lag_get_roce_netdev
35. mlx5_lag_intf_add
36. mlx5_lag_query_cong_counters

   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 #include "eswitch.h"
  38 #include "lag.h"
  39 #include "lag_mp.h"
  40 
  41 /* General purpose, use for short periods of time.
  42  * Beware of lock dependencies (preferably, no locks should be acquired
  43  * under it).
  44  */
  45 static DEFINE_MUTEX(lag_mutex);
  46 
  47 static int mlx5_cmd_create_lag(struct mlx5_core_dev *dev, u8 remap_port1,
  48                                u8 remap_port2)
  49 {
  50         u32   in[MLX5_ST_SZ_DW(create_lag_in)]   = {0};
  51         u32   out[MLX5_ST_SZ_DW(create_lag_out)] = {0};
  52         void *lag_ctx = MLX5_ADDR_OF(create_lag_in, in, ctx);
  53 
  54         MLX5_SET(create_lag_in, in, opcode, MLX5_CMD_OP_CREATE_LAG);
  55 
  56         MLX5_SET(lagc, lag_ctx, tx_remap_affinity_1, remap_port1);
  57         MLX5_SET(lagc, lag_ctx, tx_remap_affinity_2, remap_port2);
  58 
  59         return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
  60 }
  61 
  62 static int mlx5_cmd_modify_lag(struct mlx5_core_dev *dev, u8 remap_port1,
  63                                u8 remap_port2)
  64 {
  65         u32   in[MLX5_ST_SZ_DW(modify_lag_in)]   = {0};
  66         u32   out[MLX5_ST_SZ_DW(modify_lag_out)] = {0};
  67         void *lag_ctx = MLX5_ADDR_OF(modify_lag_in, in, ctx);
  68 
  69         MLX5_SET(modify_lag_in, in, opcode, MLX5_CMD_OP_MODIFY_LAG);
  70         MLX5_SET(modify_lag_in, in, field_select, 0x1);
  71 
  72         MLX5_SET(lagc, lag_ctx, tx_remap_affinity_1, remap_port1);
  73         MLX5_SET(lagc, lag_ctx, tx_remap_affinity_2, remap_port2);
  74 
  75         return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
  76 }
  77 
  78 static int mlx5_cmd_destroy_lag(struct mlx5_core_dev *dev)
  79 {
  80         u32  in[MLX5_ST_SZ_DW(destroy_lag_in)]  = {0};
  81         u32 out[MLX5_ST_SZ_DW(destroy_lag_out)] = {0};
  82 
  83         MLX5_SET(destroy_lag_in, in, opcode, MLX5_CMD_OP_DESTROY_LAG);
  84 
  85         return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
  86 }
  87 
  88 int mlx5_cmd_create_vport_lag(struct mlx5_core_dev *dev)
  89 {
  90         u32  in[MLX5_ST_SZ_DW(create_vport_lag_in)]  = {0};
  91         u32 out[MLX5_ST_SZ_DW(create_vport_lag_out)] = {0};
  92 
  93         MLX5_SET(create_vport_lag_in, in, opcode, MLX5_CMD_OP_CREATE_VPORT_LAG);
  94 
  95         return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
  96 }
  97 EXPORT_SYMBOL(mlx5_cmd_create_vport_lag);
  98 
  99 int mlx5_cmd_destroy_vport_lag(struct mlx5_core_dev *dev)
 100 {
 101         u32  in[MLX5_ST_SZ_DW(destroy_vport_lag_in)]  = {0};
 102         u32 out[MLX5_ST_SZ_DW(destroy_vport_lag_out)] = {0};
 103 
 104         MLX5_SET(destroy_vport_lag_in, in, opcode, MLX5_CMD_OP_DESTROY_VPORT_LAG);
 105 
 106         return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
 107 }
 108 EXPORT_SYMBOL(mlx5_cmd_destroy_vport_lag);
 109 
 110 static int mlx5_cmd_query_cong_counter(struct mlx5_core_dev *dev,
 111                                        bool reset, void *out, int out_size)
 112 {
 113         u32 in[MLX5_ST_SZ_DW(query_cong_statistics_in)] = { };
 114 
 115         MLX5_SET(query_cong_statistics_in, in, opcode,
 116                  MLX5_CMD_OP_QUERY_CONG_STATISTICS);
 117         MLX5_SET(query_cong_statistics_in, in, clear, reset);
 118         return mlx5_cmd_exec(dev, in, sizeof(in), out, out_size);
 119 }
 120 
 121 int mlx5_lag_dev_get_netdev_idx(struct mlx5_lag *ldev,
 122                                 struct net_device *ndev)
 123 {
 124         int i;
 125 
 126         for (i = 0; i < MLX5_MAX_PORTS; i++)
 127                 if (ldev->pf[i].netdev == ndev)
 128                         return i;
 129 
 130         return -1;
 131 }
 132 
 133 static bool __mlx5_lag_is_roce(struct mlx5_lag *ldev)
 134 {
 135         return !!(ldev->flags & MLX5_LAG_FLAG_ROCE);
 136 }
 137 
 138 static bool __mlx5_lag_is_sriov(struct mlx5_lag *ldev)
 139 {
 140         return !!(ldev->flags & MLX5_LAG_FLAG_SRIOV);
 141 }
 142 
 143 static void mlx5_infer_tx_affinity_mapping(struct lag_tracker *tracker,
 144                                            u8 *port1, u8 *port2)
 145 {
 146         *port1 = 1;
 147         *port2 = 2;
 148         if (!tracker->netdev_state[0].tx_enabled ||
 149             !tracker->netdev_state[0].link_up) {
 150                 *port1 = 2;
 151                 return;
 152         }
 153 
 154         if (!tracker->netdev_state[1].tx_enabled ||
 155             !tracker->netdev_state[1].link_up)
 156                 *port2 = 1;
 157 }
 158 
 159 void mlx5_modify_lag(struct mlx5_lag *ldev,
 160                      struct lag_tracker *tracker)
 161 {
 162         struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
 163         u8 v2p_port1, v2p_port2;
 164         int err;
 165 
 166         mlx5_infer_tx_affinity_mapping(tracker, &v2p_port1,
 167                                        &v2p_port2);
 168 
 169         if (v2p_port1 != ldev->v2p_map[0] ||
 170             v2p_port2 != ldev->v2p_map[1]) {
 171                 ldev->v2p_map[0] = v2p_port1;
 172                 ldev->v2p_map[1] = v2p_port2;
 173 
 174                 mlx5_core_info(dev0, "modify lag map port 1:%d port 2:%d",
 175                                ldev->v2p_map[0], ldev->v2p_map[1]);
 176 
 177                 err = mlx5_cmd_modify_lag(dev0, v2p_port1, v2p_port2);
 178                 if (err)
 179                         mlx5_core_err(dev0,
 180                                       "Failed to modify LAG (%d)\n",
 181                                       err);
 182         }
 183 }
 184 
 185 static int mlx5_create_lag(struct mlx5_lag *ldev,
 186                            struct lag_tracker *tracker)
 187 {
 188         struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
 189         int err;
 190 
 191         mlx5_infer_tx_affinity_mapping(tracker, &ldev->v2p_map[0],
 192                                        &ldev->v2p_map[1]);
 193 
 194         mlx5_core_info(dev0, "lag map port 1:%d port 2:%d",
 195                        ldev->v2p_map[0], ldev->v2p_map[1]);
 196 
 197         err = mlx5_cmd_create_lag(dev0, ldev->v2p_map[0], ldev->v2p_map[1]);
 198         if (err)
 199                 mlx5_core_err(dev0,
 200                               "Failed to create LAG (%d)\n",
 201                               err);
 202         return err;
 203 }
 204 
 205 int mlx5_activate_lag(struct mlx5_lag *ldev,
 206                       struct lag_tracker *tracker,
 207                       u8 flags)
 208 {
 209         bool roce_lag = !!(flags & MLX5_LAG_FLAG_ROCE);
 210         struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
 211         int err;
 212 
 213         err = mlx5_create_lag(ldev, tracker);
 214         if (err) {
 215                 if (roce_lag) {
 216                         mlx5_core_err(dev0,
 217                                       "Failed to activate RoCE LAG\n");
 218                 } else {
 219                         mlx5_core_err(dev0,
 220                                       "Failed to activate VF LAG\n"
 221                                       "Make sure all VFs are unbound prior to VF LAG activation or deactivation\n");
 222                 }
 223                 return err;
 224         }
 225 
 226         ldev->flags |= flags;
 227         return 0;
 228 }
 229 
 230 static int mlx5_deactivate_lag(struct mlx5_lag *ldev)
 231 {
 232         struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
 233         bool roce_lag = __mlx5_lag_is_roce(ldev);
 234         int err;
 235 
 236         ldev->flags &= ~MLX5_LAG_MODE_FLAGS;
 237 
 238         err = mlx5_cmd_destroy_lag(dev0);
 239         if (err) {
 240                 if (roce_lag) {
 241                         mlx5_core_err(dev0,
 242                                       "Failed to deactivate RoCE LAG; driver restart required\n");
 243                 } else {
 244                         mlx5_core_err(dev0,
 245                                       "Failed to deactivate VF LAG; driver restart required\n"
 246                                       "Make sure all VFs are unbound prior to VF LAG activation or deactivation\n");
 247                 }
 248         }
 249 
 250         return err;
 251 }
 252 
 253 static bool mlx5_lag_check_prereq(struct mlx5_lag *ldev)
 254 {
 255         if (!ldev->pf[0].dev || !ldev->pf[1].dev)
 256                 return false;
 257 
 258 #ifdef CONFIG_MLX5_ESWITCH
 259         return mlx5_esw_lag_prereq(ldev->pf[0].dev, ldev->pf[1].dev);
 260 #else
 261         return (!mlx5_sriov_is_enabled(ldev->pf[0].dev) &&
 262                 !mlx5_sriov_is_enabled(ldev->pf[1].dev));
 263 #endif
 264 }
 265 
 266 static void mlx5_lag_add_ib_devices(struct mlx5_lag *ldev)
 267 {
 268         int i;
 269 
 270         for (i = 0; i < MLX5_MAX_PORTS; i++)
 271                 if (ldev->pf[i].dev)
 272                         mlx5_add_dev_by_protocol(ldev->pf[i].dev,
 273                                                  MLX5_INTERFACE_PROTOCOL_IB);
 274 }
 275 
 276 static void mlx5_lag_remove_ib_devices(struct mlx5_lag *ldev)
 277 {
 278         int i;
 279 
 280         for (i = 0; i < MLX5_MAX_PORTS; i++)
 281                 if (ldev->pf[i].dev)
 282                         mlx5_remove_dev_by_protocol(ldev->pf[i].dev,
 283                                                     MLX5_INTERFACE_PROTOCOL_IB);
 284 }
 285 
 286 static void mlx5_do_bond(struct mlx5_lag *ldev)
 287 {
 288         struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
 289         struct mlx5_core_dev *dev1 = ldev->pf[1].dev;
 290         struct lag_tracker tracker;
 291         bool do_bond, roce_lag;
 292         int err;
 293 
 294         if (!dev0 || !dev1)
 295                 return;
 296 
 297         mutex_lock(&lag_mutex);
 298         tracker = ldev->tracker;
 299         mutex_unlock(&lag_mutex);
 300 
 301         do_bond = tracker.is_bonded && mlx5_lag_check_prereq(ldev);
 302 
 303         if (do_bond && !__mlx5_lag_is_active(ldev)) {
 304                 roce_lag = !mlx5_sriov_is_enabled(dev0) &&
 305                            !mlx5_sriov_is_enabled(dev1);
 306 
 307 #ifdef CONFIG_MLX5_ESWITCH
 308                 roce_lag &= dev0->priv.eswitch->mode == MLX5_ESWITCH_NONE &&
 309                             dev1->priv.eswitch->mode == MLX5_ESWITCH_NONE;
 310 #endif
 311 
 312                 if (roce_lag)
 313                         mlx5_lag_remove_ib_devices(ldev);
 314 
 315                 err = mlx5_activate_lag(ldev, &tracker,
 316                                         roce_lag ? MLX5_LAG_FLAG_ROCE :
 317                                         MLX5_LAG_FLAG_SRIOV);
 318                 if (err) {
 319                         if (roce_lag)
 320                                 mlx5_lag_add_ib_devices(ldev);
 321 
 322                         return;
 323                 }
 324 
 325                 if (roce_lag) {
 326                         mlx5_add_dev_by_protocol(dev0, MLX5_INTERFACE_PROTOCOL_IB);
 327                         mlx5_nic_vport_enable_roce(dev1);
 328                 }
 329         } else if (do_bond && __mlx5_lag_is_active(ldev)) {
 330                 mlx5_modify_lag(ldev, &tracker);
 331         } else if (!do_bond && __mlx5_lag_is_active(ldev)) {
 332                 roce_lag = __mlx5_lag_is_roce(ldev);
 333 
 334                 if (roce_lag) {
 335                         mlx5_remove_dev_by_protocol(dev0, MLX5_INTERFACE_PROTOCOL_IB);
 336                         mlx5_nic_vport_disable_roce(dev1);
 337                 }
 338 
 339                 err = mlx5_deactivate_lag(ldev);
 340                 if (err)
 341                         return;
 342 
 343                 if (roce_lag)
 344                         mlx5_lag_add_ib_devices(ldev);
 345         }
 346 }
 347 
 348 static void mlx5_queue_bond_work(struct mlx5_lag *ldev, unsigned long delay)
 349 {
 350         queue_delayed_work(ldev->wq, &ldev->bond_work, delay);
 351 }
 352 
 353 static void mlx5_do_bond_work(struct work_struct *work)
 354 {
 355         struct delayed_work *delayed_work = to_delayed_work(work);
 356         struct mlx5_lag *ldev = container_of(delayed_work, struct mlx5_lag,
 357                                              bond_work);
 358         int status;
 359 
 360         status = mlx5_dev_list_trylock();
 361         if (!status) {
 362                 /* 1 sec delay. */
 363                 mlx5_queue_bond_work(ldev, HZ);
 364                 return;
 365         }
 366 
 367         mlx5_do_bond(ldev);
 368         mlx5_dev_list_unlock();
 369 }
 370 
 371 static int mlx5_handle_changeupper_event(struct mlx5_lag *ldev,
 372                                          struct lag_tracker *tracker,
 373                                          struct net_device *ndev,
 374                                          struct netdev_notifier_changeupper_info *info)
 375 {
 376         struct net_device *upper = info->upper_dev, *ndev_tmp;
 377         struct netdev_lag_upper_info *lag_upper_info = NULL;
 378         bool is_bonded;
 379         int bond_status = 0;
 380         int num_slaves = 0;
 381         int idx;
 382 
 383         if (!netif_is_lag_master(upper))
 384                 return 0;
 385 
 386         if (info->linking)
 387                 lag_upper_info = info->upper_info;
 388 
 389         /* The event may still be of interest if the slave does not belong to
 390          * us, but is enslaved to a master which has one or more of our netdevs
 391          * as slaves (e.g., if a new slave is added to a master that bonds two
 392          * of our netdevs, we should unbond).
 393          */
 394         rcu_read_lock();
 395         for_each_netdev_in_bond_rcu(upper, ndev_tmp) {
 396                 idx = mlx5_lag_dev_get_netdev_idx(ldev, ndev_tmp);
 397                 if (idx > -1)
 398                         bond_status |= (1 << idx);
 399 
 400                 num_slaves++;
 401         }
 402         rcu_read_unlock();
 403 
 404         /* None of this lagdev's netdevs are slaves of this master. */
 405         if (!(bond_status & 0x3))
 406                 return 0;
 407 
 408         if (lag_upper_info)
 409                 tracker->tx_type = lag_upper_info->tx_type;
 410 
 411         /* Determine bonding status:
 412          * A device is considered bonded if both its physical ports are slaves
 413          * of the same lag master, and only them.
 414          * Lag mode must be activebackup or hash.
 415          */
 416         is_bonded = (num_slaves == MLX5_MAX_PORTS) &&
 417                     (bond_status == 0x3) &&
 418                     ((tracker->tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) ||
 419                      (tracker->tx_type == NETDEV_LAG_TX_TYPE_HASH));
 420 
 421         if (tracker->is_bonded != is_bonded) {
 422                 tracker->is_bonded = is_bonded;
 423                 return 1;
 424         }
 425 
 426         return 0;
 427 }
 428 
 429 static int mlx5_handle_changelowerstate_event(struct mlx5_lag *ldev,
 430                                               struct lag_tracker *tracker,
 431                                               struct net_device *ndev,
 432                                               struct netdev_notifier_changelowerstate_info *info)
 433 {
 434         struct netdev_lag_lower_state_info *lag_lower_info;
 435         int idx;
 436 
 437         if (!netif_is_lag_port(ndev))
 438                 return 0;
 439 
 440         idx = mlx5_lag_dev_get_netdev_idx(ldev, ndev);
 441         if (idx == -1)
 442                 return 0;
 443 
 444         /* This information is used to determine virtual to physical
 445          * port mapping.
 446          */
 447         lag_lower_info = info->lower_state_info;
 448         if (!lag_lower_info)
 449                 return 0;
 450 
 451         tracker->netdev_state[idx] = *lag_lower_info;
 452 
 453         return 1;
 454 }
 455 
 456 static int mlx5_lag_netdev_event(struct notifier_block *this,
 457                                  unsigned long event, void *ptr)
 458 {
 459         struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
 460         struct lag_tracker tracker;
 461         struct mlx5_lag *ldev;
 462         int changed = 0;
 463 
 464         if (!net_eq(dev_net(ndev), &init_net))
 465                 return NOTIFY_DONE;
 466 
 467         if ((event != NETDEV_CHANGEUPPER) && (event != NETDEV_CHANGELOWERSTATE))
 468                 return NOTIFY_DONE;
 469 
 470         ldev    = container_of(this, struct mlx5_lag, nb);
 471         tracker = ldev->tracker;
 472 
 473         switch (event) {
 474         case NETDEV_CHANGEUPPER:
 475                 changed = mlx5_handle_changeupper_event(ldev, &tracker, ndev,
 476                                                         ptr);
 477                 break;
 478         case NETDEV_CHANGELOWERSTATE:
 479                 changed = mlx5_handle_changelowerstate_event(ldev, &tracker,
 480                                                              ndev, ptr);
 481                 break;
 482         }
 483 
 484         mutex_lock(&lag_mutex);
 485         ldev->tracker = tracker;
 486         mutex_unlock(&lag_mutex);
 487 
 488         if (changed)
 489                 mlx5_queue_bond_work(ldev, 0);
 490 
 491         return NOTIFY_DONE;
 492 }
 493 
 494 static struct mlx5_lag *mlx5_lag_dev_alloc(void)
 495 {
 496         struct mlx5_lag *ldev;
 497 
 498         ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
 499         if (!ldev)
 500                 return NULL;
 501 
 502         ldev->wq = create_singlethread_workqueue("mlx5_lag");
 503         if (!ldev->wq) {
 504                 kfree(ldev);
 505                 return NULL;
 506         }
 507 
 508         INIT_DELAYED_WORK(&ldev->bond_work, mlx5_do_bond_work);
 509 
 510         return ldev;
 511 }
 512 
 513 static void mlx5_lag_dev_free(struct mlx5_lag *ldev)
 514 {
 515         destroy_workqueue(ldev->wq);
 516         kfree(ldev);
 517 }
 518 
 519 static void mlx5_lag_dev_add_pf(struct mlx5_lag *ldev,
 520                                 struct mlx5_core_dev *dev,
 521                                 struct net_device *netdev)
 522 {
 523         unsigned int fn = PCI_FUNC(dev->pdev->devfn);
 524 
 525         if (fn >= MLX5_MAX_PORTS)
 526                 return;
 527 
 528         mutex_lock(&lag_mutex);
 529         ldev->pf[fn].dev    = dev;
 530         ldev->pf[fn].netdev = netdev;
 531         ldev->tracker.netdev_state[fn].link_up = 0;
 532         ldev->tracker.netdev_state[fn].tx_enabled = 0;
 533 
 534         dev->priv.lag = ldev;
 535 
 536         mutex_unlock(&lag_mutex);
 537 }
 538 
 539 static void mlx5_lag_dev_remove_pf(struct mlx5_lag *ldev,
 540                                    struct mlx5_core_dev *dev)
 541 {
 542         int i;
 543 
 544         for (i = 0; i < MLX5_MAX_PORTS; i++)
 545                 if (ldev->pf[i].dev == dev)
 546                         break;
 547 
 548         if (i == MLX5_MAX_PORTS)
 549                 return;
 550 
 551         mutex_lock(&lag_mutex);
 552         memset(&ldev->pf[i], 0, sizeof(*ldev->pf));
 553 
 554         dev->priv.lag = NULL;
 555         mutex_unlock(&lag_mutex);
 556 }
 557 
 558 /* Must be called with intf_mutex held */
 559 void mlx5_lag_add(struct mlx5_core_dev *dev, struct net_device *netdev)
 560 {
 561         struct mlx5_lag *ldev = NULL;
 562         struct mlx5_core_dev *tmp_dev;
 563         int err;
 564 
 565         if (!MLX5_CAP_GEN(dev, vport_group_manager) ||
 566             !MLX5_CAP_GEN(dev, lag_master) ||
 567             (MLX5_CAP_GEN(dev, num_lag_ports) != MLX5_MAX_PORTS))
 568                 return;
 569 
 570         tmp_dev = mlx5_get_next_phys_dev(dev);
 571         if (tmp_dev)
 572                 ldev = tmp_dev->priv.lag;
 573 
 574         if (!ldev) {
 575                 ldev = mlx5_lag_dev_alloc();
 576                 if (!ldev) {
 577                         mlx5_core_err(dev, "Failed to alloc lag dev\n");
 578                         return;
 579                 }
 580         }
 581 
 582         mlx5_lag_dev_add_pf(ldev, dev, netdev);
 583 
 584         if (!ldev->nb.notifier_call) {
 585                 ldev->nb.notifier_call = mlx5_lag_netdev_event;
 586                 if (register_netdevice_notifier(&ldev->nb)) {
 587                         ldev->nb.notifier_call = NULL;
 588                         mlx5_core_err(dev, "Failed to register LAG netdev notifier\n");
 589                 }
 590         }
 591 
 592         err = mlx5_lag_mp_init(ldev);
 593         if (err)
 594                 mlx5_core_err(dev, "Failed to init multipath lag err=%d\n",
 595                               err);
 596 }
 597 
 598 /* Must be called with intf_mutex held */
 599 void mlx5_lag_remove(struct mlx5_core_dev *dev)
 600 {
 601         struct mlx5_lag *ldev;
 602         int i;
 603 
 604         ldev = mlx5_lag_dev_get(dev);
 605         if (!ldev)
 606                 return;
 607 
 608         if (__mlx5_lag_is_active(ldev))
 609                 mlx5_deactivate_lag(ldev);
 610 
 611         mlx5_lag_dev_remove_pf(ldev, dev);
 612 
 613         for (i = 0; i < MLX5_MAX_PORTS; i++)
 614                 if (ldev->pf[i].dev)
 615                         break;
 616 
 617         if (i == MLX5_MAX_PORTS) {
 618                 if (ldev->nb.notifier_call)
 619                         unregister_netdevice_notifier(&ldev->nb);
 620                 mlx5_lag_mp_cleanup(ldev);
 621                 cancel_delayed_work_sync(&ldev->bond_work);
 622                 mlx5_lag_dev_free(ldev);
 623         }
 624 }
 625 
 626 bool mlx5_lag_is_roce(struct mlx5_core_dev *dev)
 627 {
 628         struct mlx5_lag *ldev;
 629         bool res;
 630 
 631         mutex_lock(&lag_mutex);
 632         ldev = mlx5_lag_dev_get(dev);
 633         res  = ldev && __mlx5_lag_is_roce(ldev);
 634         mutex_unlock(&lag_mutex);
 635 
 636         return res;
 637 }
 638 EXPORT_SYMBOL(mlx5_lag_is_roce);
 639 
 640 bool mlx5_lag_is_active(struct mlx5_core_dev *dev)
 641 {
 642         struct mlx5_lag *ldev;
 643         bool res;
 644 
 645         mutex_lock(&lag_mutex);
 646         ldev = mlx5_lag_dev_get(dev);
 647         res  = ldev && __mlx5_lag_is_active(ldev);
 648         mutex_unlock(&lag_mutex);
 649 
 650         return res;
 651 }
 652 EXPORT_SYMBOL(mlx5_lag_is_active);
 653 
 654 bool mlx5_lag_is_sriov(struct mlx5_core_dev *dev)
 655 {
 656         struct mlx5_lag *ldev;
 657         bool res;
 658 
 659         mutex_lock(&lag_mutex);
 660         ldev = mlx5_lag_dev_get(dev);
 661         res  = ldev && __mlx5_lag_is_sriov(ldev);
 662         mutex_unlock(&lag_mutex);
 663 
 664         return res;
 665 }
 666 EXPORT_SYMBOL(mlx5_lag_is_sriov);
 667 
 668 void mlx5_lag_update(struct mlx5_core_dev *dev)
 669 {
 670         struct mlx5_lag *ldev;
 671 
 672         mlx5_dev_list_lock();
 673         ldev = mlx5_lag_dev_get(dev);
 674         if (!ldev)
 675                 goto unlock;
 676 
 677         mlx5_do_bond(ldev);
 678 
 679 unlock:
 680         mlx5_dev_list_unlock();
 681 }
 682 
 683 struct net_device *mlx5_lag_get_roce_netdev(struct mlx5_core_dev *dev)
 684 {
 685         struct net_device *ndev = NULL;
 686         struct mlx5_lag *ldev;
 687 
 688         mutex_lock(&lag_mutex);
 689         ldev = mlx5_lag_dev_get(dev);
 690 
 691         if (!(ldev && __mlx5_lag_is_roce(ldev)))
 692                 goto unlock;
 693 
 694         if (ldev->tracker.tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) {
 695                 ndev = ldev->tracker.netdev_state[0].tx_enabled ?
 696                        ldev->pf[0].netdev : ldev->pf[1].netdev;
 697         } else {
 698                 ndev = ldev->pf[0].netdev;
 699         }
 700         if (ndev)
 701                 dev_hold(ndev);
 702 
 703 unlock:
 704         mutex_unlock(&lag_mutex);
 705 
 706         return ndev;
 707 }
 708 EXPORT_SYMBOL(mlx5_lag_get_roce_netdev);
 709 
 710 bool mlx5_lag_intf_add(struct mlx5_interface *intf, struct mlx5_priv *priv)
 711 {
 712         struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev,
 713                                                  priv);
 714         struct mlx5_lag *ldev;
 715 
 716         if (intf->protocol != MLX5_INTERFACE_PROTOCOL_IB)
 717                 return true;
 718 
 719         ldev = mlx5_lag_dev_get(dev);
 720         if (!ldev || !__mlx5_lag_is_roce(ldev) || ldev->pf[0].dev == dev)
 721                 return true;
 722 
 723         /* If bonded, we do not add an IB device for PF1. */
 724         return false;
 725 }
 726 
 727 int mlx5_lag_query_cong_counters(struct mlx5_core_dev *dev,
 728                                  u64 *values,
 729                                  int num_counters,
 730                                  size_t *offsets)
 731 {
 732         int outlen = MLX5_ST_SZ_BYTES(query_cong_statistics_out);
 733         struct mlx5_core_dev *mdev[MLX5_MAX_PORTS];
 734         struct mlx5_lag *ldev;
 735         int num_ports;
 736         int ret, i, j;
 737         void *out;
 738 
 739         out = kvzalloc(outlen, GFP_KERNEL);
 740         if (!out)
 741                 return -ENOMEM;
 742 
 743         memset(values, 0, sizeof(*values) * num_counters);
 744 
 745         mutex_lock(&lag_mutex);
 746         ldev = mlx5_lag_dev_get(dev);
 747         if (ldev && __mlx5_lag_is_roce(ldev)) {
 748                 num_ports = MLX5_MAX_PORTS;
 749                 mdev[0] = ldev->pf[0].dev;
 750                 mdev[1] = ldev->pf[1].dev;
 751         } else {
 752                 num_ports = 1;
 753                 mdev[0] = dev;
 754         }
 755 
 756         for (i = 0; i < num_ports; ++i) {
 757                 ret = mlx5_cmd_query_cong_counter(mdev[i], false, out, outlen);
 758                 if (ret)
 759                         goto unlock;
 760 
 761                 for (j = 0; j < num_counters; ++j)
 762                         values[j] += be64_to_cpup((__be64 *)(out + offsets[j]));
 763         }
 764 
 765 unlock:
 766         mutex_unlock(&lag_mutex);
 767         kvfree(out);
 768         return ret;
 769 }
 770 EXPORT_SYMBOL(mlx5_lag_query_cong_counters);