drivers/net/ethernet/mellanox/mlx5/core/fs_counters.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/mlx5/driver.h>
  34 #include <linux/mlx5/fs.h>
  35 #include <linux/rbtree.h>
  36 #include "mlx5_core.h"
  37 #include "fs_core.h"
  38 #include "fs_cmd.h"
  39
  40 #define MLX5_FC_STATS_PERIOD msecs_to_jiffies(1000)
  41 /* Max number of counters to query in bulk read is 32K */
  42 #define MLX5_SW_MAX_COUNTERS_BULK BIT(15)
  43 #define MLX5_FC_POOL_MAX_THRESHOLD BIT(18)
  44 #define MLX5_FC_POOL_USED_BUFF_RATIO 10
  45
  46 struct mlx5_fc_cache {
  47         u64 packets;
  48         u64 bytes;
  49         u64 lastuse;
  50 };
  51
  52 struct mlx5_fc {
  53         struct list_head list;
  54         struct llist_node addlist;
  55         struct llist_node dellist;
  56
  57         /* last{packets,bytes} members are used when calculating the delta since
  58          * last reading
  59          */
  60         u64 lastpackets;
  61         u64 lastbytes;
  62
  63         struct mlx5_fc_bulk *bulk;
  64         u32 id;
  65         bool aging;
  66
  67         struct mlx5_fc_cache cache ____cacheline_aligned_in_smp;
  68 };
  69
  70 static void mlx5_fc_pool_init(struct mlx5_fc_pool *fc_pool, struct mlx5_core_dev *dev);
  71 static void mlx5_fc_pool_cleanup(struct mlx5_fc_pool *fc_pool);
  72 static struct mlx5_fc *mlx5_fc_pool_acquire_counter(struct mlx5_fc_pool *fc_pool);
  73 static void mlx5_fc_pool_release_counter(struct mlx5_fc_pool *fc_pool, struct mlx5_fc *fc);
  74
  75 /* locking scheme:
  76  *
  77  * It is the responsibility of the user to prevent concurrent calls or bad
  78  * ordering to mlx5_fc_create(), mlx5_fc_destroy() and accessing a reference
  79  * to struct mlx5_fc.
  80  * e.g en_tc.c is protected by RTNL lock of its caller, and will never call a
  81  * dump (access to struct mlx5_fc) after a counter is destroyed.
  82  *
  83  * access to counter list:
  84  * - create (user context)
  85  *   - mlx5_fc_create() only adds to an addlist to be used by
  86  *     mlx5_fc_stats_work(). addlist is a lockless single linked list
  87  *     that doesn't require any additional synchronization when adding single
  88  *     node.
  89  *   - spawn thread to do the actual destroy
  90  *
  91  * - destroy (user context)
  92  *   - add a counter to lockless dellist
  93  *   - spawn thread to do the actual del
  94  *
  95  * - dump (user context)
  96  *   user should not call dump after destroy
  97  *
  98  * - query (single thread workqueue context)
  99  *   destroy/dump - no conflict (see destroy)
 100  *   query/dump - packets and bytes might be inconsistent (since update is not
 101  *                atomic)
 102  *   query/create - no conflict (see create)
 103  *   since every create/destroy spawn the work, only after necessary time has
 104  *   elapsed, the thread will actually query the hardware.
 105  */
 106
 107 static struct list_head *mlx5_fc_counters_lookup_next(struct mlx5_core_dev *dev,
 108                                                       u32 id)
 109 {
 110         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 111         unsigned long next_id = (unsigned long)id + 1;
 112         struct mlx5_fc *counter;
 113         unsigned long tmp;
 114
 115         rcu_read_lock();
 116         /* skip counters that are in idr, but not yet in counters list */
 117         idr_for_each_entry_continue_ul(&fc_stats->counters_idr,
 118                                        counter, tmp, next_id) {
 119                 if (!list_empty(&counter->list))
 120                         break;
 121         }
 122         rcu_read_unlock();
 123
 124         return counter ? &counter->list : &fc_stats->counters;
 125 }
 126
 127 static void mlx5_fc_stats_insert(struct mlx5_core_dev *dev,
 128                                  struct mlx5_fc *counter)
 129 {
 130         struct list_head *next = mlx5_fc_counters_lookup_next(dev, counter->id);
 131
 132         list_add_tail(&counter->list, next);
 133 }
 134
 135 static void mlx5_fc_stats_remove(struct mlx5_core_dev *dev,
 136                                  struct mlx5_fc *counter)
 137 {
 138         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 139
 140         list_del(&counter->list);
 141
 142         spin_lock(&fc_stats->counters_idr_lock);
 143         WARN_ON(!idr_remove(&fc_stats->counters_idr, counter->id));
 144         spin_unlock(&fc_stats->counters_idr_lock);
 145 }
 146
 147 static int get_max_bulk_query_len(struct mlx5_core_dev *dev)
 148 {
 149         return min_t(int, MLX5_SW_MAX_COUNTERS_BULK,
 150                           (1 << MLX5_CAP_GEN(dev, log_max_flow_counter_bulk)));
 151 }
 152
 153 static void update_counter_cache(int index, u32 *bulk_raw_data,
 154                                  struct mlx5_fc_cache *cache)
 155 {
 156         void *stats = MLX5_ADDR_OF(query_flow_counter_out, bulk_raw_data,
 157                              flow_statistics[index]);
 158         u64 packets = MLX5_GET64(traffic_counter, stats, packets);
 159         u64 bytes = MLX5_GET64(traffic_counter, stats, octets);
 160
 161         if (cache->packets == packets)
 162                 return;
 163
 164         cache->packets = packets;
 165         cache->bytes = bytes;
 166         cache->lastuse = jiffies;
 167 }
 168
 169 static void mlx5_fc_stats_query_counter_range(struct mlx5_core_dev *dev,
 170                                               struct mlx5_fc *first,
 171                                               u32 last_id)
 172 {
 173         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 174         bool query_more_counters = (first->id <= last_id);
 175         int max_bulk_len = get_max_bulk_query_len(dev);
 176         u32 *data = fc_stats->bulk_query_out;
 177         struct mlx5_fc *counter = first;
 178         u32 bulk_base_id;
 179         int bulk_len;
 180         int err;
 181
 182         while (query_more_counters) {
 183                 /* first id must be aligned to 4 when using bulk query */
 184                 bulk_base_id = counter->id & ~0x3;
 185
 186                 /* number of counters to query inc. the last counter */
 187                 bulk_len = min_t(int, max_bulk_len,
 188                                  ALIGN(last_id - bulk_base_id + 1, 4));
 189
 190                 err = mlx5_cmd_fc_bulk_query(dev, bulk_base_id, bulk_len,
 191                                              data);
 192                 if (err) {
 193                         mlx5_core_err(dev, "Error doing bulk query: %d\n", err);
 194                         return;
 195                 }
 196                 query_more_counters = false;
 197
 198                 list_for_each_entry_from(counter, &fc_stats->counters, list) {
 199                         int counter_index = counter->id - bulk_base_id;
 200                         struct mlx5_fc_cache *cache = &counter->cache;
 201
 202                         if (counter->id >= bulk_base_id + bulk_len) {
 203                                 query_more_counters = true;
 204                                 break;
 205                         }
 206
 207                         update_counter_cache(counter_index, data, cache);
 208                 }
 209         }
 210 }
 211
 212 static void mlx5_fc_free(struct mlx5_core_dev *dev, struct mlx5_fc *counter)
 213 {
 214         mlx5_cmd_fc_free(dev, counter->id);
 215         kfree(counter);
 216 }
 217
 218 static void mlx5_fc_release(struct mlx5_core_dev *dev, struct mlx5_fc *counter)
 219 {
 220         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 221
 222         if (counter->bulk)
 223                 mlx5_fc_pool_release_counter(&fc_stats->fc_pool, counter);
 224         else
 225                 mlx5_fc_free(dev, counter);
 226 }
 227
 228 static void mlx5_fc_stats_work(struct work_struct *work)
 229 {
 230         struct mlx5_core_dev *dev = container_of(work, struct mlx5_core_dev,
 231                                                  priv.fc_stats.work.work);
 232         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 233         /* Take dellist first to ensure that counters cannot be deleted before
 234          * they are inserted.
 235          */
 236         struct llist_node *dellist = llist_del_all(&fc_stats->dellist);
 237         struct llist_node *addlist = llist_del_all(&fc_stats->addlist);
 238         struct mlx5_fc *counter = NULL, *last = NULL, *tmp;
 239         unsigned long now = jiffies;
 240
 241         if (addlist || !list_empty(&fc_stats->counters))
 242                 queue_delayed_work(fc_stats->wq, &fc_stats->work,
 243                                    fc_stats->sampling_interval);
 244
 245         llist_for_each_entry(counter, addlist, addlist)
 246                 mlx5_fc_stats_insert(dev, counter);
 247
 248         llist_for_each_entry_safe(counter, tmp, dellist, dellist) {
 249                 mlx5_fc_stats_remove(dev, counter);
 250
 251                 mlx5_fc_release(dev, counter);
 252         }
 253
 254         if (time_before(now, fc_stats->next_query) ||
 255             list_empty(&fc_stats->counters))
 256                 return;
 257         last = list_last_entry(&fc_stats->counters, struct mlx5_fc, list);
 258
 259         counter = list_first_entry(&fc_stats->counters, struct mlx5_fc,
 260                                    list);
 261         if (counter)
 262                 mlx5_fc_stats_query_counter_range(dev, counter, last->id);
 263
 264         fc_stats->next_query = now + fc_stats->sampling_interval;
 265 }
 266
 267 static struct mlx5_fc *mlx5_fc_single_alloc(struct mlx5_core_dev *dev)
 268 {
 269         struct mlx5_fc *counter;
 270         int err;
 271
 272         counter = kzalloc(sizeof(*counter), GFP_KERNEL);
 273         if (!counter)
 274                 return ERR_PTR(-ENOMEM);
 275
 276         err = mlx5_cmd_fc_alloc(dev, &counter->id);
 277         if (err) {
 278                 kfree(counter);
 279                 return ERR_PTR(err);
 280         }
 281
 282         return counter;
 283 }
 284
 285 static struct mlx5_fc *mlx5_fc_acquire(struct mlx5_core_dev *dev, bool aging)
 286 {
 287         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 288         struct mlx5_fc *counter;
 289
 290         if (aging && MLX5_CAP_GEN(dev, flow_counter_bulk_alloc) != 0) {
 291                 counter = mlx5_fc_pool_acquire_counter(&fc_stats->fc_pool);
 292                 if (!IS_ERR(counter))
 293                         return counter;
 294         }
 295
 296         return mlx5_fc_single_alloc(dev);
 297 }
 298
 299 struct mlx5_fc *mlx5_fc_create(struct mlx5_core_dev *dev, bool aging)
 300 {
 301         struct mlx5_fc *counter = mlx5_fc_acquire(dev, aging);
 302         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 303         int err;
 304
 305         if (IS_ERR(counter))
 306                 return counter;
 307
 308         INIT_LIST_HEAD(&counter->list);
 309         counter->aging = aging;
 310
 311         if (aging) {
 312                 u32 id = counter->id;
 313
 314                 counter->cache.lastuse = jiffies;
 315                 counter->lastbytes = counter->cache.bytes;
 316                 counter->lastpackets = counter->cache.packets;
 317
 318                 idr_preload(GFP_KERNEL);
 319                 spin_lock(&fc_stats->counters_idr_lock);
 320
 321                 err = idr_alloc_u32(&fc_stats->counters_idr, counter, &id, id,
 322                                     GFP_NOWAIT);
 323
 324                 spin_unlock(&fc_stats->counters_idr_lock);
 325                 idr_preload_end();
 326                 if (err)
 327                         goto err_out_alloc;
 328
 329                 llist_add(&counter->addlist, &fc_stats->addlist);
 330
 331                 mod_delayed_work(fc_stats->wq, &fc_stats->work, 0);
 332         }
 333
 334         return counter;
 335
 336 err_out_alloc:
 337         mlx5_fc_release(dev, counter);
 338         return ERR_PTR(err);
 339 }
 340 EXPORT_SYMBOL(mlx5_fc_create);
 341
 342 u32 mlx5_fc_id(struct mlx5_fc *counter)
 343 {
 344         return counter->id;
 345 }
 346 EXPORT_SYMBOL(mlx5_fc_id);
 347
 348 void mlx5_fc_destroy(struct mlx5_core_dev *dev, struct mlx5_fc *counter)
 349 {
 350         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 351
 352         if (!counter)
 353                 return;
 354
 355         if (counter->aging) {
 356                 llist_add(&counter->dellist, &fc_stats->dellist);
 357                 mod_delayed_work(fc_stats->wq, &fc_stats->work, 0);
 358                 return;
 359         }
 360
 361         mlx5_fc_release(dev, counter);
 362 }
 363 EXPORT_SYMBOL(mlx5_fc_destroy);
 364
 365 int mlx5_init_fc_stats(struct mlx5_core_dev *dev)
 366 {
 367         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 368         int max_bulk_len;
 369         int max_out_len;
 370
 371         spin_lock_init(&fc_stats->counters_idr_lock);
 372         idr_init(&fc_stats->counters_idr);
 373         INIT_LIST_HEAD(&fc_stats->counters);
 374         init_llist_head(&fc_stats->addlist);
 375         init_llist_head(&fc_stats->dellist);
 376
 377         max_bulk_len = get_max_bulk_query_len(dev);
 378         max_out_len = mlx5_cmd_fc_get_bulk_query_out_len(max_bulk_len);
 379         fc_stats->bulk_query_out = kzalloc(max_out_len, GFP_KERNEL);
 380         if (!fc_stats->bulk_query_out)
 381                 return -ENOMEM;
 382
 383         fc_stats->wq = create_singlethread_workqueue("mlx5_fc");
 384         if (!fc_stats->wq)
 385                 goto err_wq_create;
 386
 387         fc_stats->sampling_interval = MLX5_FC_STATS_PERIOD;
 388         INIT_DELAYED_WORK(&fc_stats->work, mlx5_fc_stats_work);
 389
 390         mlx5_fc_pool_init(&fc_stats->fc_pool, dev);
 391         return 0;
 392
 393 err_wq_create:
 394         kfree(fc_stats->bulk_query_out);
 395         return -ENOMEM;
 396 }
 397
 398 void mlx5_cleanup_fc_stats(struct mlx5_core_dev *dev)
 399 {
 400         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 401         struct llist_node *tmplist;
 402         struct mlx5_fc *counter;
 403         struct mlx5_fc *tmp;
 404
 405         cancel_delayed_work_sync(&dev->priv.fc_stats.work);
 406         destroy_workqueue(dev->priv.fc_stats.wq);
 407         dev->priv.fc_stats.wq = NULL;
 408
 409         tmplist = llist_del_all(&fc_stats->addlist);
 410         llist_for_each_entry_safe(counter, tmp, tmplist, addlist)
 411                 mlx5_fc_release(dev, counter);
 412
 413         list_for_each_entry_safe(counter, tmp, &fc_stats->counters, list)
 414                 mlx5_fc_release(dev, counter);
 415
 416         mlx5_fc_pool_cleanup(&fc_stats->fc_pool);
 417         idr_destroy(&fc_stats->counters_idr);
 418         kfree(fc_stats->bulk_query_out);
 419 }
 420
 421 int mlx5_fc_query(struct mlx5_core_dev *dev, struct mlx5_fc *counter,
 422                   u64 *packets, u64 *bytes)
 423 {
 424         return mlx5_cmd_fc_query(dev, counter->id, packets, bytes);
 425 }
 426 EXPORT_SYMBOL(mlx5_fc_query);
 427
 428 u64 mlx5_fc_query_lastuse(struct mlx5_fc *counter)
 429 {
 430         return counter->cache.lastuse;
 431 }
 432
 433 void mlx5_fc_query_cached(struct mlx5_fc *counter,
 434                           u64 *bytes, u64 *packets, u64 *lastuse)
 435 {
 436         struct mlx5_fc_cache c;
 437
 438         c = counter->cache;
 439
 440         *bytes = c.bytes - counter->lastbytes;
 441         *packets = c.packets - counter->lastpackets;
 442         *lastuse = c.lastuse;
 443
 444         counter->lastbytes = c.bytes;
 445         counter->lastpackets = c.packets;
 446 }
 447
 448 void mlx5_fc_queue_stats_work(struct mlx5_core_dev *dev,
 449                               struct delayed_work *dwork,
 450                               unsigned long delay)
 451 {
 452         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 453
 454         queue_delayed_work(fc_stats->wq, dwork, delay);
 455 }
 456
 457 void mlx5_fc_update_sampling_interval(struct mlx5_core_dev *dev,
 458                                       unsigned long interval)
 459 {
 460         struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
 461
 462         fc_stats->sampling_interval = min_t(unsigned long, interval,
 463                                             fc_stats->sampling_interval);
 464 }
 465
 466 /* Flow counter bluks */
 467
 468 struct mlx5_fc_bulk {
 469         struct list_head pool_list;
 470         u32 base_id;
 471         int bulk_len;
 472         unsigned long *bitmask;
 473         struct mlx5_fc fcs[0];
 474 };
 475
 476 static void mlx5_fc_init(struct mlx5_fc *counter, struct mlx5_fc_bulk *bulk,
 477                          u32 id)
 478 {
 479         counter->bulk = bulk;
 480         counter->id = id;
 481 }
 482
 483 static int mlx5_fc_bulk_get_free_fcs_amount(struct mlx5_fc_bulk *bulk)
 484 {
 485         return bitmap_weight(bulk->bitmask, bulk->bulk_len);
 486 }
 487
 488 static struct mlx5_fc_bulk *mlx5_fc_bulk_create(struct mlx5_core_dev *dev)
 489 {
 490         enum mlx5_fc_bulk_alloc_bitmask alloc_bitmask;
 491         struct mlx5_fc_bulk *bulk;
 492         int err = -ENOMEM;
 493         int bulk_len;
 494         u32 base_id;
 495         int i;
 496
 497         alloc_bitmask = MLX5_CAP_GEN(dev, flow_counter_bulk_alloc);
 498         bulk_len = alloc_bitmask > 0 ? MLX5_FC_BULK_NUM_FCS(alloc_bitmask) : 1;
 499
 500         bulk = kzalloc(sizeof(*bulk) + bulk_len * sizeof(struct mlx5_fc),
 501                        GFP_KERNEL);
 502         if (!bulk)
 503                 goto err_alloc_bulk;
 504
 505         bulk->bitmask = kcalloc(BITS_TO_LONGS(bulk_len), sizeof(unsigned long),
 506                                 GFP_KERNEL);
 507         if (!bulk->bitmask)
 508                 goto err_alloc_bitmask;
 509
 510         err = mlx5_cmd_fc_bulk_alloc(dev, alloc_bitmask, &base_id);
 511         if (err)
 512                 goto err_mlx5_cmd_bulk_alloc;
 513
 514         bulk->base_id = base_id;
 515         bulk->bulk_len = bulk_len;
 516         for (i = 0; i < bulk_len; i++) {
 517                 mlx5_fc_init(&bulk->fcs[i], bulk, base_id + i);
 518                 set_bit(i, bulk->bitmask);
 519         }
 520
 521         return bulk;
 522
 523 err_mlx5_cmd_bulk_alloc:
 524         kfree(bulk->bitmask);
 525 err_alloc_bitmask:
 526         kfree(bulk);
 527 err_alloc_bulk:
 528         return ERR_PTR(err);
 529 }
 530
 531 static int
 532 mlx5_fc_bulk_destroy(struct mlx5_core_dev *dev, struct mlx5_fc_bulk *bulk)
 533 {
 534         if (mlx5_fc_bulk_get_free_fcs_amount(bulk) < bulk->bulk_len) {
 535                 mlx5_core_err(dev, "Freeing bulk before all counters were released\n");
 536                 return -EBUSY;
 537         }
 538
 539         mlx5_cmd_fc_free(dev, bulk->base_id);
 540         kfree(bulk->bitmask);
 541         kfree(bulk);
 542
 543         return 0;
 544 }
 545
 546 static struct mlx5_fc *mlx5_fc_bulk_acquire_fc(struct mlx5_fc_bulk *bulk)
 547 {
 548         int free_fc_index = find_first_bit(bulk->bitmask, bulk->bulk_len);
 549
 550         if (free_fc_index >= bulk->bulk_len)
 551                 return ERR_PTR(-ENOSPC);
 552
 553         clear_bit(free_fc_index, bulk->bitmask);
 554         return &bulk->fcs[free_fc_index];
 555 }
 556
 557 static int mlx5_fc_bulk_release_fc(struct mlx5_fc_bulk *bulk, struct mlx5_fc *fc)
 558 {
 559         int fc_index = fc->id - bulk->base_id;
 560
 561         if (test_bit(fc_index, bulk->bitmask))
 562                 return -EINVAL;
 563
 564         set_bit(fc_index, bulk->bitmask);
 565         return 0;
 566 }
 567
 568 /* Flow counters pool API */
 569
 570 static void mlx5_fc_pool_init(struct mlx5_fc_pool *fc_pool, struct mlx5_core_dev *dev)
 571 {
 572         fc_pool->dev = dev;
 573         mutex_init(&fc_pool->pool_lock);
 574         INIT_LIST_HEAD(&fc_pool->fully_used);
 575         INIT_LIST_HEAD(&fc_pool->partially_used);
 576         INIT_LIST_HEAD(&fc_pool->unused);
 577         fc_pool->available_fcs = 0;
 578         fc_pool->used_fcs = 0;
 579         fc_pool->threshold = 0;
 580 }
 581
 582 static void mlx5_fc_pool_cleanup(struct mlx5_fc_pool *fc_pool)
 583 {
 584         struct mlx5_core_dev *dev = fc_pool->dev;
 585         struct mlx5_fc_bulk *bulk;
 586         struct mlx5_fc_bulk *tmp;
 587
 588         list_for_each_entry_safe(bulk, tmp, &fc_pool->fully_used, pool_list)
 589                 mlx5_fc_bulk_destroy(dev, bulk);
 590         list_for_each_entry_safe(bulk, tmp, &fc_pool->partially_used, pool_list)
 591                 mlx5_fc_bulk_destroy(dev, bulk);
 592         list_for_each_entry_safe(bulk, tmp, &fc_pool->unused, pool_list)
 593                 mlx5_fc_bulk_destroy(dev, bulk);
 594 }
 595
 596 static void mlx5_fc_pool_update_threshold(struct mlx5_fc_pool *fc_pool)
 597 {
 598         fc_pool->threshold = min_t(int, MLX5_FC_POOL_MAX_THRESHOLD,
 599                                    fc_pool->used_fcs / MLX5_FC_POOL_USED_BUFF_RATIO);
 600 }
 601
 602 static struct mlx5_fc_bulk *
 603 mlx5_fc_pool_alloc_new_bulk(struct mlx5_fc_pool *fc_pool)
 604 {
 605         struct mlx5_core_dev *dev = fc_pool->dev;
 606         struct mlx5_fc_bulk *new_bulk;
 607
 608         new_bulk = mlx5_fc_bulk_create(dev);
 609         if (!IS_ERR(new_bulk))
 610                 fc_pool->available_fcs += new_bulk->bulk_len;
 611         mlx5_fc_pool_update_threshold(fc_pool);
 612         return new_bulk;
 613 }
 614
 615 static void
 616 mlx5_fc_pool_free_bulk(struct mlx5_fc_pool *fc_pool, struct mlx5_fc_bulk *bulk)
 617 {
 618         struct mlx5_core_dev *dev = fc_pool->dev;
 619
 620         fc_pool->available_fcs -= bulk->bulk_len;
 621         mlx5_fc_bulk_destroy(dev, bulk);
 622         mlx5_fc_pool_update_threshold(fc_pool);
 623 }
 624
 625 static struct mlx5_fc *
 626 mlx5_fc_pool_acquire_from_list(struct list_head *src_list,
 627                                struct list_head *next_list,
 628                                bool move_non_full_bulk)
 629 {
 630         struct mlx5_fc_bulk *bulk;
 631         struct mlx5_fc *fc;
 632
 633         if (list_empty(src_list))
 634                 return ERR_PTR(-ENODATA);
 635
 636         bulk = list_first_entry(src_list, struct mlx5_fc_bulk, pool_list);
 637         fc = mlx5_fc_bulk_acquire_fc(bulk);
 638         if (move_non_full_bulk || mlx5_fc_bulk_get_free_fcs_amount(bulk) == 0)
 639                 list_move(&bulk->pool_list, next_list);
 640         return fc;
 641 }
 642
 643 static struct mlx5_fc *
 644 mlx5_fc_pool_acquire_counter(struct mlx5_fc_pool *fc_pool)
 645 {
 646         struct mlx5_fc_bulk *new_bulk;
 647         struct mlx5_fc *fc;
 648
 649         mutex_lock(&fc_pool->pool_lock);
 650
 651         fc = mlx5_fc_pool_acquire_from_list(&fc_pool->partially_used,
 652                                             &fc_pool->fully_used, false);
 653         if (IS_ERR(fc))
 654                 fc = mlx5_fc_pool_acquire_from_list(&fc_pool->unused,
 655                                                     &fc_pool->partially_used,
 656                                                     true);
 657         if (IS_ERR(fc)) {
 658                 new_bulk = mlx5_fc_pool_alloc_new_bulk(fc_pool);
 659                 if (IS_ERR(new_bulk)) {
 660                         fc = ERR_CAST(new_bulk);
 661                         goto out;
 662                 }
 663                 fc = mlx5_fc_bulk_acquire_fc(new_bulk);
 664                 list_add(&new_bulk->pool_list, &fc_pool->partially_used);
 665         }
 666         fc_pool->available_fcs--;
 667         fc_pool->used_fcs++;
 668
 669 out:
 670         mutex_unlock(&fc_pool->pool_lock);
 671         return fc;
 672 }
 673
 674 static void
 675 mlx5_fc_pool_release_counter(struct mlx5_fc_pool *fc_pool, struct mlx5_fc *fc)
 676 {
 677         struct mlx5_core_dev *dev = fc_pool->dev;
 678         struct mlx5_fc_bulk *bulk = fc->bulk;
 679         int bulk_free_fcs_amount;
 680
 681         mutex_lock(&fc_pool->pool_lock);
 682
 683         if (mlx5_fc_bulk_release_fc(bulk, fc)) {
 684                 mlx5_core_warn(dev, "Attempted to release a counter which is not acquired\n");
 685                 goto unlock;
 686         }
 687
 688         fc_pool->available_fcs++;
 689         fc_pool->used_fcs--;
 690
 691         bulk_free_fcs_amount = mlx5_fc_bulk_get_free_fcs_amount(bulk);
 692         if (bulk_free_fcs_amount == 1)
 693                 list_move_tail(&bulk->pool_list, &fc_pool->partially_used);
 694         if (bulk_free_fcs_amount == bulk->bulk_len) {
 695                 list_del(&bulk->pool_list);
 696                 if (fc_pool->available_fcs > fc_pool->threshold)
 697                         mlx5_fc_pool_free_bulk(fc_pool, bulk);
 698                 else
 699                         list_add(&bulk->pool_list, &fc_pool->unused);
 700         }
 701
 702 unlock:
 703         mutex_unlock(&fc_pool->pool_lock);
 704 }