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net/mlx5_core: Flow counters infrastructure

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If a counter has the aging flag set when created, it is added to a list
of counters that will be queried periodically from a workqueue.  query
result and last use timestamp are cached.
add/del counter must be very efficient since thousands of such
operations might be issued in a second.
There is only a single reference to counters without aging, therefore
no need for locks.
But, counters with aging enabled are stored in a list. In order to make
code as lockless as possible, all the list manipulation and access to
hardware is done from a single context - the periodic counters query
thread.

The hardware supports multiple counters per FTE, however currently we
are using one counter for each FTE.

Signed-off-by: Amir Vadai <amirva@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amir Vadai
2016-05-13 12:55:41 +00:00
committed by David S. Miller
parent bd5251dbf1
commit 43a335e055
6 changed files with 255 additions and 2 deletions
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14
include/linux/mlx5/driver.h
View File

@@ -41,6 +41,7 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/radix-tree.h>
#include <linux/workqueue.h>
#include <linux/mlx5/device.h>
#include <linux/mlx5/doorbell.h>
@@ -457,6 +458,17 @@ struct mlx5_irq_info {
char name[MLX5_MAX_IRQ_NAME];
};
struct mlx5_fc_stats {
struct list_head list;
struct list_head addlist;
/* protect addlist add/splice operations */
spinlock_t addlist_lock;
struct workqueue_struct *wq;
struct delayed_work work;
unsigned long next_query;
};
struct mlx5_eswitch;
struct mlx5_priv {
@@ -520,6 +532,8 @@ struct mlx5_priv {
struct mlx5_flow_root_namespace *fdb_root_ns;
struct mlx5_flow_root_namespace *esw_egress_root_ns;
struct mlx5_flow_root_namespace *esw_ingress_root_ns;
struct mlx5_fc_stats fc_stats;
};
enum mlx5_device_state {

5
include/linux/mlx5/fs.h
View File

@@ -127,4 +127,9 @@ int mlx5_modify_rule_destination(struct mlx5_flow_rule *rule,
struct mlx5_flow_destination *dest);
struct mlx5_fc *mlx5_flow_rule_counter(struct mlx5_flow_rule *rule);
struct mlx5_fc *mlx5_fc_create(struct mlx5_core_dev *dev, bool aging);
void mlx5_fc_destroy(struct mlx5_core_dev *dev, struct mlx5_fc *counter);
void mlx5_fc_query_cached(struct mlx5_fc *counter,
u64 *bytes, u64 *packets, u64 *lastuse);
#endif