IB/mlx5: Support congestion related counters

This patch adds support to query the congestion related hardware counters
through new command and links them with other hw counters being available
in hw_counters sysfs location.

In order to reuse existing infrastructure it renames related q_counter
data structures to more generic counters to reflect q_counters and
congestion counters and maybe some other counters in the future.

New hardware counters:
 * rp_cnp_handled - CNP packets handled by the reaction point
 * rp_cnp_ignored - CNP packets ignored by the reaction point
 * np_cnp_sent    - CNP packets sent by notification point to respond to
                     CE marked RoCE packets
 * np_ecn_marked_roce_packets - CE marked RoCE packets received by
                                notification point

It also avoids returning ENOSYS which is specific for invalid
system call and produces the following checkpatch.pl warning.

WARNING: ENOSYS means 'invalid syscall nr' and nothing else
+		return -ENOSYS;

Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index ce8ba617d46e..191b82b038d7 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -595,15 +595,16 @@ struct mlx5_ib_resources {
 	struct mutex	mutex;
 };
 
-struct mlx5_ib_q_counters {
+struct mlx5_ib_counters {
 	const char **names;
 	size_t *offsets;
-	u32 num_counters;
+	u32 num_q_counters;
+	u32 num_cong_counters;
 	u16 set_id;
 };
 
 struct mlx5_ib_port {
-	struct mlx5_ib_q_counters q_cnts;
+	struct mlx5_ib_counters cnts;
 };
 
 struct mlx5_roce {