IB/mlx5: Add flow counters binding support

Associates a counters with a flow when IB_FLOW_SPEC_ACTION_COUNT is part
of the flow specifications.

The counters user space placements of location and description (index,
description) pairs are passed as private data of the counters flow
specification.
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Raed Salem <raeds@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx5/mlx5_ib.h

@@ -175,6 +175,7 @@ struct mlx5_ib_flow_handler {
 	struct ib_flow			ibflow;
 	struct mlx5_ib_flow_prio	*prio;
 	struct mlx5_flow_handle		*rule;
+	struct ib_counters		*ibcounters;
 };
 
 struct mlx5_ib_flow_db {
@@ -813,8 +814,22 @@ struct mlx5_memic {
 	DECLARE_BITMAP(memic_alloc_pages, MLX5_MAX_MEMIC_PAGES);
 };
 
+enum mlx5_ib_counters_type {
+	MLX5_IB_COUNTERS_FLOW,
+};
+
 struct mlx5_ib_mcounters {
 	struct ib_counters ibcntrs;
+	enum mlx5_ib_counters_type type;
+	void *hw_cntrs_hndl;
+	/* max index set as part of create_flow */
+	u32 cntrs_max_index;
+	/* number of counters data entries (<description,index> pair) */
+	u32 ncounters;
+	/* counters data array for descriptions and indexes */
+	struct mlx5_ib_flow_counters_desc *counters_data;
+	/* protects access to mcounters internal data */
+	struct mutex mcntrs_mutex;
 };
 
 static inline struct mlx5_ib_mcounters *

include/linux/mlx5/fs.h

@@ -160,6 +160,7 @@ struct mlx5_flow_act {
 	u32 modify_id;
 	uintptr_t esp_id;
 	struct mlx5_fs_vlan vlan;
+	struct ib_counters *counters;
 };
 
 #define MLX5_DECLARE_FLOW_ACT(name) \

include/uapi/rdma/mlx5-abi.h

@@ -36,6 +36,7 @@
 
 #include <linux/types.h>
 #include <linux/if_ether.h>	/* For ETH_ALEN. */
+#include <rdma/ib_user_ioctl_verbs.h>
 
 enum {
 	MLX5_QP_FLAG_SIGNATURE		= 1 << 0,
@@ -441,4 +442,27 @@ enum {
 enum {
 	MLX5_IB_CLOCK_INFO_V1              = 0,
 };
+
+struct mlx5_ib_flow_counters_desc {
+	__u32	description;
+	__u32	index;
+};
+
+struct mlx5_ib_flow_counters_data {
+	RDMA_UAPI_PTR(struct mlx5_ib_flow_counters_desc *, counters_data);
+	__u32   ncounters;
+	__u32   reserved;
+};
+
+struct mlx5_ib_create_flow {
+	__u32   ncounters_data;
+	__u32   reserved;
+	/*
+	 * Following are counters data based on ncounters_data, each
+	 * entry in the data[] should match a corresponding counter object
+	 * that was pointed by a counters spec upon the flow creation
+	 */
+	struct mlx5_ib_flow_counters_data data[];
+};
+
 #endif /* MLX5_ABI_USER_H */