drivers/net/ethernet/mellanox/mlxsw/spectrum_cnt.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved */
   3
   4 #include <linux/kernel.h>
   5 #include <linux/bitops.h>
   6 #include <linux/spinlock.h>
   7
   8 #include "spectrum_cnt.h"
   9
  10 struct mlxsw_sp_counter_sub_pool {
  11         u64 size;
  12         unsigned int base_index;
  13         enum mlxsw_res_id entry_size_res_id;
  14         const char *resource_name; /* devlink resource name */
  15         u64 resource_id; /* devlink resource id */
  16         unsigned int entry_size;
  17         unsigned int bank_count;
  18         atomic_t active_entries_count;
  19 };
  20
  21 struct mlxsw_sp_counter_pool {
  22         u64 pool_size;
  23         unsigned long *usage; /* Usage bitmap */
  24         spinlock_t counter_pool_lock; /* Protects counter pool allocations */
  25         atomic_t active_entries_count;
  26         unsigned int sub_pools_count;
  27         struct mlxsw_sp_counter_sub_pool sub_pools[] __counted_by(sub_pools_count);
  28 };
  29
  30 static const struct mlxsw_sp_counter_sub_pool mlxsw_sp_counter_sub_pools[] = {
  31         [MLXSW_SP_COUNTER_SUB_POOL_FLOW] = {
  32                 .entry_size_res_id = MLXSW_RES_ID_COUNTER_SIZE_PACKETS_BYTES,
  33                 .resource_name = MLXSW_SP_RESOURCE_NAME_COUNTERS_FLOW,
  34                 .resource_id = MLXSW_SP_RESOURCE_COUNTERS_FLOW,
  35                 .bank_count = 6,
  36         },
  37         [MLXSW_SP_COUNTER_SUB_POOL_RIF] = {
  38                 .entry_size_res_id = MLXSW_RES_ID_COUNTER_SIZE_ROUTER_BASIC,
  39                 .resource_name = MLXSW_SP_RESOURCE_NAME_COUNTERS_RIF,
  40                 .resource_id = MLXSW_SP_RESOURCE_COUNTERS_RIF,
  41                 .bank_count = 2,
  42         }
  43 };
  44
  45 static u64 mlxsw_sp_counter_sub_pool_occ_get(void *priv)
  46 {
  47         const struct mlxsw_sp_counter_sub_pool *sub_pool = priv;
  48
  49         return atomic_read(&sub_pool->active_entries_count);
  50 }
  51
  52 static int mlxsw_sp_counter_sub_pools_init(struct mlxsw_sp *mlxsw_sp)
  53 {
  54         struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
  55         struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
  56         struct mlxsw_sp_counter_sub_pool *sub_pool;
  57         unsigned int base_index = 0;
  58         enum mlxsw_res_id res_id;
  59         int err;
  60         int i;
  61
  62         for (i = 0; i < pool->sub_pools_count; i++) {
  63                 sub_pool = &pool->sub_pools[i];
  64                 res_id = sub_pool->entry_size_res_id;
  65
  66                 if (!mlxsw_core_res_valid(mlxsw_sp->core, res_id))
  67                         return -EIO;
  68                 sub_pool->entry_size = mlxsw_core_res_get(mlxsw_sp->core,
  69                                                           res_id);
  70                 err = devl_resource_size_get(devlink,
  71                                              sub_pool->resource_id,
  72                                              &sub_pool->size);
  73                 if (err)
  74                         goto err_resource_size_get;
  75
  76                 devl_resource_occ_get_register(devlink,
  77                                                sub_pool->resource_id,
  78                                                mlxsw_sp_counter_sub_pool_occ_get,
  79                                                sub_pool);
  80
  81                 sub_pool->base_index = base_index;
  82                 base_index += sub_pool->size;
  83                 atomic_set(&sub_pool->active_entries_count, 0);
  84         }
  85         return 0;
  86
  87 err_resource_size_get:
  88         for (i--; i >= 0; i--) {
  89                 sub_pool = &pool->sub_pools[i];
  90
  91                 devl_resource_occ_get_unregister(devlink,
  92                                                  sub_pool->resource_id);
  93         }
  94         return err;
  95 }
  96
  97 static void mlxsw_sp_counter_sub_pools_fini(struct mlxsw_sp *mlxsw_sp)
  98 {
  99         struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
 100         struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
 101         struct mlxsw_sp_counter_sub_pool *sub_pool;
 102         int i;
 103
 104         for (i = 0; i < pool->sub_pools_count; i++) {
 105                 sub_pool = &pool->sub_pools[i];
 106
 107                 WARN_ON(atomic_read(&sub_pool->active_entries_count));
 108                 devl_resource_occ_get_unregister(devlink,
 109                                                  sub_pool->resource_id);
 110         }
 111 }
 112
 113 static u64 mlxsw_sp_counter_pool_occ_get(void *priv)
 114 {
 115         const struct mlxsw_sp_counter_pool *pool = priv;
 116
 117         return atomic_read(&pool->active_entries_count);
 118 }
 119
 120 int mlxsw_sp_counter_pool_init(struct mlxsw_sp *mlxsw_sp)
 121 {
 122         unsigned int sub_pools_count = ARRAY_SIZE(mlxsw_sp_counter_sub_pools);
 123         struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
 124         struct mlxsw_sp_counter_pool *pool;
 125         int err;
 126
 127         pool = kzalloc(struct_size(pool, sub_pools, sub_pools_count),
 128                        GFP_KERNEL);
 129         if (!pool)
 130                 return -ENOMEM;
 131         mlxsw_sp->counter_pool = pool;
 132         pool->sub_pools_count = sub_pools_count;
 133         memcpy(pool->sub_pools, mlxsw_sp_counter_sub_pools,
 134                flex_array_size(pool, sub_pools, pool->sub_pools_count));
 135         spin_lock_init(&pool->counter_pool_lock);
 136         atomic_set(&pool->active_entries_count, 0);
 137
 138         err = devl_resource_size_get(devlink, MLXSW_SP_RESOURCE_COUNTERS,
 139                                      &pool->pool_size);
 140         if (err)
 141                 goto err_pool_resource_size_get;
 142         devl_resource_occ_get_register(devlink, MLXSW_SP_RESOURCE_COUNTERS,
 143                                        mlxsw_sp_counter_pool_occ_get, pool);
 144
 145         pool->usage = bitmap_zalloc(pool->pool_size, GFP_KERNEL);
 146         if (!pool->usage) {
 147                 err = -ENOMEM;
 148                 goto err_usage_alloc;
 149         }
 150
 151         err = mlxsw_sp_counter_sub_pools_init(mlxsw_sp);
 152         if (err)
 153                 goto err_sub_pools_init;
 154
 155         return 0;
 156
 157 err_sub_pools_init:
 158         bitmap_free(pool->usage);
 159 err_usage_alloc:
 160         devl_resource_occ_get_unregister(devlink,
 161                                          MLXSW_SP_RESOURCE_COUNTERS);
 162 err_pool_resource_size_get:
 163         kfree(pool);
 164         return err;
 165 }
 166
 167 void mlxsw_sp_counter_pool_fini(struct mlxsw_sp *mlxsw_sp)
 168 {
 169         struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
 170         struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
 171
 172         mlxsw_sp_counter_sub_pools_fini(mlxsw_sp);
 173         WARN_ON(find_first_bit(pool->usage, pool->pool_size) !=
 174                                pool->pool_size);
 175         WARN_ON(atomic_read(&pool->active_entries_count));
 176         bitmap_free(pool->usage);
 177         devl_resource_occ_get_unregister(devlink,
 178                                          MLXSW_SP_RESOURCE_COUNTERS);
 179         kfree(pool);
 180 }
 181
 182 int mlxsw_sp_counter_alloc(struct mlxsw_sp *mlxsw_sp,
 183                            enum mlxsw_sp_counter_sub_pool_id sub_pool_id,
 184                            unsigned int *p_counter_index)
 185 {
 186         struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
 187         struct mlxsw_sp_counter_sub_pool *sub_pool;
 188         unsigned int entry_index;
 189         unsigned int stop_index;
 190         int i, err;
 191
 192         sub_pool = &pool->sub_pools[sub_pool_id];
 193         stop_index = sub_pool->base_index + sub_pool->size;
 194         entry_index = sub_pool->base_index;
 195
 196         spin_lock(&pool->counter_pool_lock);
 197         entry_index = find_next_zero_bit(pool->usage, stop_index, entry_index);
 198         if (entry_index == stop_index) {
 199                 err = -ENOBUFS;
 200                 goto err_alloc;
 201         }
 202         /* The sub-pools can contain non-integer number of entries
 203          * so we must check for overflow
 204          */
 205         if (entry_index + sub_pool->entry_size > stop_index) {
 206                 err = -ENOBUFS;
 207                 goto err_alloc;
 208         }
 209         for (i = 0; i < sub_pool->entry_size; i++)
 210                 __set_bit(entry_index + i, pool->usage);
 211         spin_unlock(&pool->counter_pool_lock);
 212
 213         *p_counter_index = entry_index;
 214         atomic_add(sub_pool->entry_size, &sub_pool->active_entries_count);
 215         atomic_add(sub_pool->entry_size, &pool->active_entries_count);
 216         return 0;
 217
 218 err_alloc:
 219         spin_unlock(&pool->counter_pool_lock);
 220         return err;
 221 }
 222
 223 void mlxsw_sp_counter_free(struct mlxsw_sp *mlxsw_sp,
 224                            enum mlxsw_sp_counter_sub_pool_id sub_pool_id,
 225                            unsigned int counter_index)
 226 {
 227         struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
 228         struct mlxsw_sp_counter_sub_pool *sub_pool;
 229         int i;
 230
 231         if (WARN_ON(counter_index >= pool->pool_size))
 232                 return;
 233         sub_pool = &pool->sub_pools[sub_pool_id];
 234         spin_lock(&pool->counter_pool_lock);
 235         for (i = 0; i < sub_pool->entry_size; i++)
 236                 __clear_bit(counter_index + i, pool->usage);
 237         spin_unlock(&pool->counter_pool_lock);
 238         atomic_sub(sub_pool->entry_size, &sub_pool->active_entries_count);
 239         atomic_sub(sub_pool->entry_size, &pool->active_entries_count);
 240 }
 241
 242 int mlxsw_sp_counter_resources_register(struct mlxsw_core *mlxsw_core)
 243 {
 244         static struct devlink_resource_size_params size_params;
 245         struct devlink *devlink = priv_to_devlink(mlxsw_core);
 246         const struct mlxsw_sp_counter_sub_pool *sub_pool;
 247         unsigned int total_bank_config;
 248         u64 sub_pool_size;
 249         u64 base_index;
 250         u64 pool_size;
 251         u64 bank_size;
 252         int err;
 253         int i;
 254
 255         if (!MLXSW_CORE_RES_VALID(mlxsw_core, COUNTER_POOL_SIZE) ||
 256             !MLXSW_CORE_RES_VALID(mlxsw_core, COUNTER_BANK_SIZE))
 257                 return -EIO;
 258
 259         pool_size = MLXSW_CORE_RES_GET(mlxsw_core, COUNTER_POOL_SIZE);
 260         bank_size = MLXSW_CORE_RES_GET(mlxsw_core, COUNTER_BANK_SIZE);
 261
 262         devlink_resource_size_params_init(&size_params, pool_size,
 263                                           pool_size, bank_size,
 264                                           DEVLINK_RESOURCE_UNIT_ENTRY);
 265         err = devl_resource_register(devlink,
 266                                      MLXSW_SP_RESOURCE_NAME_COUNTERS,
 267                                      pool_size,
 268                                      MLXSW_SP_RESOURCE_COUNTERS,
 269                                      DEVLINK_RESOURCE_ID_PARENT_TOP,
 270                                      &size_params);
 271         if (err)
 272                 return err;
 273
 274         /* Allocation is based on bank count which should be
 275          * specified for each sub pool statically.
 276          */
 277         total_bank_config = 0;
 278         base_index = 0;
 279         for (i = 0; i < ARRAY_SIZE(mlxsw_sp_counter_sub_pools); i++) {
 280                 sub_pool = &mlxsw_sp_counter_sub_pools[i];
 281                 sub_pool_size = sub_pool->bank_count * bank_size;
 282                 /* The last bank can't be fully used */
 283                 if (base_index + sub_pool_size > pool_size)
 284                         sub_pool_size = pool_size - base_index;
 285                 base_index += sub_pool_size;
 286
 287                 devlink_resource_size_params_init(&size_params, sub_pool_size,
 288                                                   sub_pool_size, bank_size,
 289                                                   DEVLINK_RESOURCE_UNIT_ENTRY);
 290                 err = devl_resource_register(devlink,
 291                                              sub_pool->resource_name,
 292                                              sub_pool_size,
 293                                              sub_pool->resource_id,
 294                                              MLXSW_SP_RESOURCE_COUNTERS,
 295                                              &size_params);
 296                 if (err)
 297                         return err;
 298                 total_bank_config += sub_pool->bank_count;
 299         }
 300
 301         /* Check config is valid, no bank over subscription */
 302         if (WARN_ON(total_bank_config > div64_u64(pool_size, bank_size) + 1))
 303                 return -EINVAL;
 304
 305         return 0;
 306 }