blob: 17fe30a4c06ca73d6d724d6e68c3bdb25e1c0639 [file] [log] [blame]
/*
* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/mlx5/driver.h>
#include <linux/mlx5/fs.h>
#include <linux/rbtree.h>
#include "mlx5_core.h"
#include "fs_core.h"
#include "fs_cmd.h"
#define MLX5_FC_STATS_PERIOD msecs_to_jiffies(1000)
#define MLX5_FC_BULK_QUERY_ALLOC_PERIOD msecs_to_jiffies(180 * 1000)
/* Max number of counters to query in bulk read is 32K */
#define MLX5_SW_MAX_COUNTERS_BULK BIT(15)
#define MLX5_INIT_COUNTERS_BULK 8
#define MLX5_FC_POOL_MAX_THRESHOLD BIT(18)
#define MLX5_FC_POOL_USED_BUFF_RATIO 10
struct mlx5_fc_cache {
u64 packets;
u64 bytes;
u64 lastuse;
};
struct mlx5_fc {
struct list_head list;
struct llist_node addlist;
struct llist_node dellist;
/* last{packets,bytes} members are used when calculating the delta since
* last reading
*/
u64 lastpackets;
u64 lastbytes;
struct mlx5_fc_bulk *bulk;
u32 id;
bool aging;
struct mlx5_fc_cache cache ____cacheline_aligned_in_smp;
};
static void mlx5_fc_pool_init(struct mlx5_fc_pool *fc_pool, struct mlx5_core_dev *dev);
static void mlx5_fc_pool_cleanup(struct mlx5_fc_pool *fc_pool);
static struct mlx5_fc *mlx5_fc_pool_acquire_counter(struct mlx5_fc_pool *fc_pool);
static void mlx5_fc_pool_release_counter(struct mlx5_fc_pool *fc_pool, struct mlx5_fc *fc);
/* locking scheme:
*
* It is the responsibility of the user to prevent concurrent calls or bad
* ordering to mlx5_fc_create(), mlx5_fc_destroy() and accessing a reference
* to struct mlx5_fc.
* e.g en_tc.c is protected by RTNL lock of its caller, and will never call a
* dump (access to struct mlx5_fc) after a counter is destroyed.
*
* access to counter list:
* - create (user context)
* - mlx5_fc_create() only adds to an addlist to be used by
* mlx5_fc_stats_work(). addlist is a lockless single linked list
* that doesn't require any additional synchronization when adding single
* node.
* - spawn thread to do the actual destroy
*
* - destroy (user context)
* - add a counter to lockless dellist
* - spawn thread to do the actual del
*
* - dump (user context)
* user should not call dump after destroy
*
* - query (single thread workqueue context)
* destroy/dump - no conflict (see destroy)
* query/dump - packets and bytes might be inconsistent (since update is not
* atomic)
* query/create - no conflict (see create)
* since every create/destroy spawn the work, only after necessary time has
* elapsed, the thread will actually query the hardware.
*/
static struct list_head *mlx5_fc_counters_lookup_next(struct mlx5_core_dev *dev,
u32 id)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
unsigned long next_id = (unsigned long)id + 1;
struct mlx5_fc *counter;
unsigned long tmp;
rcu_read_lock();
/* skip counters that are in idr, but not yet in counters list */
idr_for_each_entry_continue_ul(&fc_stats->counters_idr,
counter, tmp, next_id) {
if (!list_empty(&counter->list))
break;
}
rcu_read_unlock();
return counter ? &counter->list : &fc_stats->counters;
}
static void mlx5_fc_stats_insert(struct mlx5_core_dev *dev,
struct mlx5_fc *counter)
{
struct list_head *next = mlx5_fc_counters_lookup_next(dev, counter->id);
list_add_tail(&counter->list, next);
}
static void mlx5_fc_stats_remove(struct mlx5_core_dev *dev,
struct mlx5_fc *counter)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
list_del(&counter->list);
spin_lock(&fc_stats->counters_idr_lock);
WARN_ON(!idr_remove(&fc_stats->counters_idr, counter->id));
spin_unlock(&fc_stats->counters_idr_lock);
}
static int get_init_bulk_query_len(struct mlx5_core_dev *dev)
{
return min_t(int, MLX5_INIT_COUNTERS_BULK,
(1 << MLX5_CAP_GEN(dev, log_max_flow_counter_bulk)));
}
static int get_max_bulk_query_len(struct mlx5_core_dev *dev)
{
return min_t(int, MLX5_SW_MAX_COUNTERS_BULK,
(1 << MLX5_CAP_GEN(dev, log_max_flow_counter_bulk)));
}
static void update_counter_cache(int index, u32 *bulk_raw_data,
struct mlx5_fc_cache *cache)
{
void *stats = MLX5_ADDR_OF(query_flow_counter_out, bulk_raw_data,
flow_statistics[index]);
u64 packets = MLX5_GET64(traffic_counter, stats, packets);
u64 bytes = MLX5_GET64(traffic_counter, stats, octets);
if (cache->packets == packets)
return;
cache->packets = packets;
cache->bytes = bytes;
cache->lastuse = jiffies;
}
static void mlx5_fc_stats_query_counter_range(struct mlx5_core_dev *dev,
struct mlx5_fc *first,
u32 last_id)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
bool query_more_counters = (first->id <= last_id);
int cur_bulk_len = fc_stats->bulk_query_len;
u32 *data = fc_stats->bulk_query_out;
struct mlx5_fc *counter = first;
u32 bulk_base_id;
int bulk_len;
int err;
while (query_more_counters) {
/* first id must be aligned to 4 when using bulk query */
bulk_base_id = counter->id & ~0x3;
/* number of counters to query inc. the last counter */
bulk_len = min_t(int, cur_bulk_len,
ALIGN(last_id - bulk_base_id + 1, 4));
err = mlx5_cmd_fc_bulk_query(dev, bulk_base_id, bulk_len,
data);
if (err) {
mlx5_core_err(dev, "Error doing bulk query: %d\n", err);
return;
}
query_more_counters = false;
list_for_each_entry_from(counter, &fc_stats->counters, list) {
int counter_index = counter->id - bulk_base_id;
struct mlx5_fc_cache *cache = &counter->cache;
if (counter->id >= bulk_base_id + bulk_len) {
query_more_counters = true;
break;
}
update_counter_cache(counter_index, data, cache);
}
}
}
static void mlx5_fc_free(struct mlx5_core_dev *dev, struct mlx5_fc *counter)
{
mlx5_cmd_fc_free(dev, counter->id);
kfree(counter);
}
static void mlx5_fc_release(struct mlx5_core_dev *dev, struct mlx5_fc *counter)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
if (counter->bulk)
mlx5_fc_pool_release_counter(&fc_stats->fc_pool, counter);
else
mlx5_fc_free(dev, counter);
}
static void mlx5_fc_stats_bulk_query_size_increase(struct mlx5_core_dev *dev)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
int max_bulk_len = get_max_bulk_query_len(dev);
unsigned long now = jiffies;
u32 *bulk_query_out_tmp;
int max_out_len;
if (fc_stats->bulk_query_alloc_failed &&
time_before(now, fc_stats->next_bulk_query_alloc))
return;
max_out_len = mlx5_cmd_fc_get_bulk_query_out_len(max_bulk_len);
bulk_query_out_tmp = kzalloc(max_out_len, GFP_KERNEL);
if (!bulk_query_out_tmp) {
mlx5_core_warn_once(dev,
"Can't increase flow counters bulk query buffer size, insufficient memory, bulk_size(%d)\n",
max_bulk_len);
fc_stats->bulk_query_alloc_failed = true;
fc_stats->next_bulk_query_alloc =
now + MLX5_FC_BULK_QUERY_ALLOC_PERIOD;
return;
}
kfree(fc_stats->bulk_query_out);
fc_stats->bulk_query_out = bulk_query_out_tmp;
fc_stats->bulk_query_len = max_bulk_len;
if (fc_stats->bulk_query_alloc_failed) {
mlx5_core_info(dev,
"Flow counters bulk query buffer size increased, bulk_size(%d)\n",
max_bulk_len);
fc_stats->bulk_query_alloc_failed = false;
}
}
static void mlx5_fc_stats_work(struct work_struct *work)
{
struct mlx5_core_dev *dev = container_of(work, struct mlx5_core_dev,
priv.fc_stats.work.work);
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
/* Take dellist first to ensure that counters cannot be deleted before
* they are inserted.
*/
struct llist_node *dellist = llist_del_all(&fc_stats->dellist);
struct llist_node *addlist = llist_del_all(&fc_stats->addlist);
struct mlx5_fc *counter = NULL, *last = NULL, *tmp;
unsigned long now = jiffies;
if (addlist || !list_empty(&fc_stats->counters))
queue_delayed_work(fc_stats->wq, &fc_stats->work,
fc_stats->sampling_interval);
llist_for_each_entry(counter, addlist, addlist) {
mlx5_fc_stats_insert(dev, counter);
fc_stats->num_counters++;
}
llist_for_each_entry_safe(counter, tmp, dellist, dellist) {
mlx5_fc_stats_remove(dev, counter);
mlx5_fc_release(dev, counter);
fc_stats->num_counters--;
}
if (fc_stats->bulk_query_len < get_max_bulk_query_len(dev) &&
fc_stats->num_counters > get_init_bulk_query_len(dev))
mlx5_fc_stats_bulk_query_size_increase(dev);
if (time_before(now, fc_stats->next_query) ||
list_empty(&fc_stats->counters))
return;
last = list_last_entry(&fc_stats->counters, struct mlx5_fc, list);
counter = list_first_entry(&fc_stats->counters, struct mlx5_fc,
list);
if (counter)
mlx5_fc_stats_query_counter_range(dev, counter, last->id);
fc_stats->next_query = now + fc_stats->sampling_interval;
}
static struct mlx5_fc *mlx5_fc_single_alloc(struct mlx5_core_dev *dev)
{
struct mlx5_fc *counter;
int err;
counter = kzalloc(sizeof(*counter), GFP_KERNEL);
if (!counter)
return ERR_PTR(-ENOMEM);
err = mlx5_cmd_fc_alloc(dev, &counter->id);
if (err) {
kfree(counter);
return ERR_PTR(err);
}
return counter;
}
static struct mlx5_fc *mlx5_fc_acquire(struct mlx5_core_dev *dev, bool aging)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
struct mlx5_fc *counter;
if (aging && MLX5_CAP_GEN(dev, flow_counter_bulk_alloc) != 0) {
counter = mlx5_fc_pool_acquire_counter(&fc_stats->fc_pool);
if (!IS_ERR(counter))
return counter;
}
return mlx5_fc_single_alloc(dev);
}
struct mlx5_fc *mlx5_fc_create_ex(struct mlx5_core_dev *dev, bool aging)
{
struct mlx5_fc *counter = mlx5_fc_acquire(dev, aging);
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
int err;
if (IS_ERR(counter))
return counter;
INIT_LIST_HEAD(&counter->list);
counter->aging = aging;
if (aging) {
u32 id = counter->id;
counter->cache.lastuse = jiffies;
counter->lastbytes = counter->cache.bytes;
counter->lastpackets = counter->cache.packets;
idr_preload(GFP_KERNEL);
spin_lock(&fc_stats->counters_idr_lock);
err = idr_alloc_u32(&fc_stats->counters_idr, counter, &id, id,
GFP_NOWAIT);
spin_unlock(&fc_stats->counters_idr_lock);
idr_preload_end();
if (err)
goto err_out_alloc;
llist_add(&counter->addlist, &fc_stats->addlist);
}
return counter;
err_out_alloc:
mlx5_fc_release(dev, counter);
return ERR_PTR(err);
}
struct mlx5_fc *mlx5_fc_create(struct mlx5_core_dev *dev, bool aging)
{
struct mlx5_fc *counter = mlx5_fc_create_ex(dev, aging);
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
if (aging)
mod_delayed_work(fc_stats->wq, &fc_stats->work, 0);
return counter;
}
EXPORT_SYMBOL(mlx5_fc_create);
u32 mlx5_fc_id(struct mlx5_fc *counter)
{
return counter->id;
}
EXPORT_SYMBOL(mlx5_fc_id);
void mlx5_fc_destroy(struct mlx5_core_dev *dev, struct mlx5_fc *counter)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
if (!counter)
return;
if (counter->aging) {
llist_add(&counter->dellist, &fc_stats->dellist);
mod_delayed_work(fc_stats->wq, &fc_stats->work, 0);
return;
}
mlx5_fc_release(dev, counter);
}
EXPORT_SYMBOL(mlx5_fc_destroy);
int mlx5_init_fc_stats(struct mlx5_core_dev *dev)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
int init_bulk_len;
int init_out_len;
spin_lock_init(&fc_stats->counters_idr_lock);
idr_init(&fc_stats->counters_idr);
INIT_LIST_HEAD(&fc_stats->counters);
init_llist_head(&fc_stats->addlist);
init_llist_head(&fc_stats->dellist);
init_bulk_len = get_init_bulk_query_len(dev);
init_out_len = mlx5_cmd_fc_get_bulk_query_out_len(init_bulk_len);
fc_stats->bulk_query_out = kzalloc(init_out_len, GFP_KERNEL);
if (!fc_stats->bulk_query_out)
return -ENOMEM;
fc_stats->bulk_query_len = init_bulk_len;
fc_stats->wq = create_singlethread_workqueue("mlx5_fc");
if (!fc_stats->wq)
goto err_wq_create;
fc_stats->sampling_interval = MLX5_FC_STATS_PERIOD;
INIT_DELAYED_WORK(&fc_stats->work, mlx5_fc_stats_work);
mlx5_fc_pool_init(&fc_stats->fc_pool, dev);
return 0;
err_wq_create:
kfree(fc_stats->bulk_query_out);
return -ENOMEM;
}
void mlx5_cleanup_fc_stats(struct mlx5_core_dev *dev)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
struct llist_node *tmplist;
struct mlx5_fc *counter;
struct mlx5_fc *tmp;
cancel_delayed_work_sync(&dev->priv.fc_stats.work);
destroy_workqueue(dev->priv.fc_stats.wq);
dev->priv.fc_stats.wq = NULL;
tmplist = llist_del_all(&fc_stats->addlist);
llist_for_each_entry_safe(counter, tmp, tmplist, addlist)
mlx5_fc_release(dev, counter);
list_for_each_entry_safe(counter, tmp, &fc_stats->counters, list)
mlx5_fc_release(dev, counter);
mlx5_fc_pool_cleanup(&fc_stats->fc_pool);
idr_destroy(&fc_stats->counters_idr);
kfree(fc_stats->bulk_query_out);
}
int mlx5_fc_query(struct mlx5_core_dev *dev, struct mlx5_fc *counter,
u64 *packets, u64 *bytes)
{
return mlx5_cmd_fc_query(dev, counter->id, packets, bytes);
}
EXPORT_SYMBOL(mlx5_fc_query);
u64 mlx5_fc_query_lastuse(struct mlx5_fc *counter)
{
return counter->cache.lastuse;
}
void mlx5_fc_query_cached(struct mlx5_fc *counter,
u64 *bytes, u64 *packets, u64 *lastuse)
{
struct mlx5_fc_cache c;
c = counter->cache;
*bytes = c.bytes - counter->lastbytes;
*packets = c.packets - counter->lastpackets;
*lastuse = c.lastuse;
counter->lastbytes = c.bytes;
counter->lastpackets = c.packets;
}
void mlx5_fc_query_cached_raw(struct mlx5_fc *counter,
u64 *bytes, u64 *packets, u64 *lastuse)
{
struct mlx5_fc_cache c = counter->cache;
*bytes = c.bytes;
*packets = c.packets;
*lastuse = c.lastuse;
}
void mlx5_fc_queue_stats_work(struct mlx5_core_dev *dev,
struct delayed_work *dwork,
unsigned long delay)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
queue_delayed_work(fc_stats->wq, dwork, delay);
}
void mlx5_fc_update_sampling_interval(struct mlx5_core_dev *dev,
unsigned long interval)
{
struct mlx5_fc_stats *fc_stats = &dev->priv.fc_stats;
fc_stats->sampling_interval = min_t(unsigned long, interval,
fc_stats->sampling_interval);
}
/* Flow counter bluks */
struct mlx5_fc_bulk {
struct list_head pool_list;
u32 base_id;
int bulk_len;
unsigned long *bitmask;
struct mlx5_fc fcs[];
};
static void mlx5_fc_init(struct mlx5_fc *counter, struct mlx5_fc_bulk *bulk,
u32 id)
{
counter->bulk = bulk;
counter->id = id;
}
static int mlx5_fc_bulk_get_free_fcs_amount(struct mlx5_fc_bulk *bulk)
{
return bitmap_weight(bulk->bitmask, bulk->bulk_len);
}
static struct mlx5_fc_bulk *mlx5_fc_bulk_create(struct mlx5_core_dev *dev)
{
enum mlx5_fc_bulk_alloc_bitmask alloc_bitmask;
struct mlx5_fc_bulk *bulk;
int err = -ENOMEM;
int bulk_len;
u32 base_id;
int i;
alloc_bitmask = MLX5_CAP_GEN(dev, flow_counter_bulk_alloc);
bulk_len = alloc_bitmask > 0 ? MLX5_FC_BULK_NUM_FCS(alloc_bitmask) : 1;
bulk = kvzalloc(struct_size(bulk, fcs, bulk_len), GFP_KERNEL);
if (!bulk)
goto err_alloc_bulk;
bulk->bitmask = kvcalloc(BITS_TO_LONGS(bulk_len), sizeof(unsigned long),
GFP_KERNEL);
if (!bulk->bitmask)
goto err_alloc_bitmask;
err = mlx5_cmd_fc_bulk_alloc(dev, alloc_bitmask, &base_id);
if (err)
goto err_mlx5_cmd_bulk_alloc;
bulk->base_id = base_id;
bulk->bulk_len = bulk_len;
for (i = 0; i < bulk_len; i++) {
mlx5_fc_init(&bulk->fcs[i], bulk, base_id + i);
set_bit(i, bulk->bitmask);
}
return bulk;
err_mlx5_cmd_bulk_alloc:
kvfree(bulk->bitmask);
err_alloc_bitmask:
kvfree(bulk);
err_alloc_bulk:
return ERR_PTR(err);
}
static int
mlx5_fc_bulk_destroy(struct mlx5_core_dev *dev, struct mlx5_fc_bulk *bulk)
{
if (mlx5_fc_bulk_get_free_fcs_amount(bulk) < bulk->bulk_len) {
mlx5_core_err(dev, "Freeing bulk before all counters were released\n");
return -EBUSY;
}
mlx5_cmd_fc_free(dev, bulk->base_id);
kvfree(bulk->bitmask);
kvfree(bulk);
return 0;
}
static struct mlx5_fc *mlx5_fc_bulk_acquire_fc(struct mlx5_fc_bulk *bulk)
{
int free_fc_index = find_first_bit(bulk->bitmask, bulk->bulk_len);
if (free_fc_index >= bulk->bulk_len)
return ERR_PTR(-ENOSPC);
clear_bit(free_fc_index, bulk->bitmask);
return &bulk->fcs[free_fc_index];
}
static int mlx5_fc_bulk_release_fc(struct mlx5_fc_bulk *bulk, struct mlx5_fc *fc)
{
int fc_index = fc->id - bulk->base_id;
if (test_bit(fc_index, bulk->bitmask))
return -EINVAL;
set_bit(fc_index, bulk->bitmask);
return 0;
}
/* Flow counters pool API */
static void mlx5_fc_pool_init(struct mlx5_fc_pool *fc_pool, struct mlx5_core_dev *dev)
{
fc_pool->dev = dev;
mutex_init(&fc_pool->pool_lock);
INIT_LIST_HEAD(&fc_pool->fully_used);
INIT_LIST_HEAD(&fc_pool->partially_used);
INIT_LIST_HEAD(&fc_pool->unused);
fc_pool->available_fcs = 0;
fc_pool->used_fcs = 0;
fc_pool->threshold = 0;
}
static void mlx5_fc_pool_cleanup(struct mlx5_fc_pool *fc_pool)
{
struct mlx5_core_dev *dev = fc_pool->dev;
struct mlx5_fc_bulk *bulk;
struct mlx5_fc_bulk *tmp;
list_for_each_entry_safe(bulk, tmp, &fc_pool->fully_used, pool_list)
mlx5_fc_bulk_destroy(dev, bulk);
list_for_each_entry_safe(bulk, tmp, &fc_pool->partially_used, pool_list)
mlx5_fc_bulk_destroy(dev, bulk);
list_for_each_entry_safe(bulk, tmp, &fc_pool->unused, pool_list)
mlx5_fc_bulk_destroy(dev, bulk);
}
static void mlx5_fc_pool_update_threshold(struct mlx5_fc_pool *fc_pool)
{
fc_pool->threshold = min_t(int, MLX5_FC_POOL_MAX_THRESHOLD,
fc_pool->used_fcs / MLX5_FC_POOL_USED_BUFF_RATIO);
}
static struct mlx5_fc_bulk *
mlx5_fc_pool_alloc_new_bulk(struct mlx5_fc_pool *fc_pool)
{
struct mlx5_core_dev *dev = fc_pool->dev;
struct mlx5_fc_bulk *new_bulk;
new_bulk = mlx5_fc_bulk_create(dev);
if (!IS_ERR(new_bulk))
fc_pool->available_fcs += new_bulk->bulk_len;
mlx5_fc_pool_update_threshold(fc_pool);
return new_bulk;
}
static void
mlx5_fc_pool_free_bulk(struct mlx5_fc_pool *fc_pool, struct mlx5_fc_bulk *bulk)
{
struct mlx5_core_dev *dev = fc_pool->dev;
fc_pool->available_fcs -= bulk->bulk_len;
mlx5_fc_bulk_destroy(dev, bulk);
mlx5_fc_pool_update_threshold(fc_pool);
}
static struct mlx5_fc *
mlx5_fc_pool_acquire_from_list(struct list_head *src_list,
struct list_head *next_list,
bool move_non_full_bulk)
{
struct mlx5_fc_bulk *bulk;
struct mlx5_fc *fc;
if (list_empty(src_list))
return ERR_PTR(-ENODATA);
bulk = list_first_entry(src_list, struct mlx5_fc_bulk, pool_list);
fc = mlx5_fc_bulk_acquire_fc(bulk);
if (move_non_full_bulk || mlx5_fc_bulk_get_free_fcs_amount(bulk) == 0)
list_move(&bulk->pool_list, next_list);
return fc;
}
static struct mlx5_fc *
mlx5_fc_pool_acquire_counter(struct mlx5_fc_pool *fc_pool)
{
struct mlx5_fc_bulk *new_bulk;
struct mlx5_fc *fc;
mutex_lock(&fc_pool->pool_lock);
fc = mlx5_fc_pool_acquire_from_list(&fc_pool->partially_used,
&fc_pool->fully_used, false);
if (IS_ERR(fc))
fc = mlx5_fc_pool_acquire_from_list(&fc_pool->unused,
&fc_pool->partially_used,
true);
if (IS_ERR(fc)) {
new_bulk = mlx5_fc_pool_alloc_new_bulk(fc_pool);
if (IS_ERR(new_bulk)) {
fc = ERR_CAST(new_bulk);
goto out;
}
fc = mlx5_fc_bulk_acquire_fc(new_bulk);
list_add(&new_bulk->pool_list, &fc_pool->partially_used);
}
fc_pool->available_fcs--;
fc_pool->used_fcs++;
out:
mutex_unlock(&fc_pool->pool_lock);
return fc;
}
static void
mlx5_fc_pool_release_counter(struct mlx5_fc_pool *fc_pool, struct mlx5_fc *fc)
{
struct mlx5_core_dev *dev = fc_pool->dev;
struct mlx5_fc_bulk *bulk = fc->bulk;
int bulk_free_fcs_amount;
mutex_lock(&fc_pool->pool_lock);
if (mlx5_fc_bulk_release_fc(bulk, fc)) {
mlx5_core_warn(dev, "Attempted to release a counter which is not acquired\n");
goto unlock;
}
fc_pool->available_fcs++;
fc_pool->used_fcs--;
bulk_free_fcs_amount = mlx5_fc_bulk_get_free_fcs_amount(bulk);
if (bulk_free_fcs_amount == 1)
list_move_tail(&bulk->pool_list, &fc_pool->partially_used);
if (bulk_free_fcs_amount == bulk->bulk_len) {
list_del(&bulk->pool_list);
if (fc_pool->available_fcs > fc_pool->threshold)
mlx5_fc_pool_free_bulk(fc_pool, bulk);
else
list_add(&bulk->pool_list, &fc_pool->unused);
}
unlock:
mutex_unlock(&fc_pool->pool_lock);
}