[dpdk-dev] [PATCH 3/4] common/mlx5: add DevX commands for queue counters

[Matan Azrad]

A queue counter set is an HW object that can be assigned to any RQ\QP
and it counts HW events on the assigned QPs\RQs.

Add DevX API to allocate and query queue counter set object.

The only used counter event is the "out of buffer" where the queue
drops packets when no SW buffer is available to receive it.

Cc: stable at dpdk.org

Signed-off-by: Matan Azrad <matan at nvidia.com>
---
 drivers/common/mlx5/mlx5_devx_cmds.c | 72 ++++++++++++++++++++++++++++++++
 drivers/common/mlx5/mlx5_devx_cmds.h |  6 +++
 drivers/common/mlx5/mlx5_prm.h       | 81 ++++++++++++++++++++++++++++++++++++
 drivers/common/mlx5/version.map      |  4 +-
 4 files changed, 162 insertions(+), 1 deletion(-)

diff --git a/drivers/common/mlx5/mlx5_devx_cmds.c b/drivers/common/mlx5/mlx5_devx_cmds.c
index 2dcc1ff..0060c37 100644
--- a/drivers/common/mlx5/mlx5_devx_cmds.c
+++ b/drivers/common/mlx5/mlx5_devx_cmds.c
@@ -2193,3 +2193,75 @@ struct mlx5_devx_obj *
 #endif
 }
 
+/*
+ * Allocate queue counters via devx interface.
+ *
+ * @param[in] ctx
+ *   Context returned from mlx5 open_device() glue function.
+ *
+ * @return
+ *   Pointer to counter object on success, a NULL value otherwise and
+ *   rte_errno is set.
+ */
+struct mlx5_devx_obj *
+mlx5_devx_cmd_queue_counter_alloc(void *ctx)
+{
+	struct mlx5_devx_obj *dcs = mlx5_malloc(MLX5_MEM_ZERO, sizeof(*dcs), 0,
+						SOCKET_ID_ANY);
+	uint32_t in[MLX5_ST_SZ_DW(alloc_q_counter_in)]   = {0};
+	uint32_t out[MLX5_ST_SZ_DW(alloc_q_counter_out)] = {0};
+
+	if (!dcs) {
+		rte_errno = ENOMEM;
+		return NULL;
+	}
+	MLX5_SET(alloc_q_counter_in, in, opcode, MLX5_CMD_OP_ALLOC_Q_COUNTER);
+	dcs->obj = mlx5_glue->devx_obj_create(ctx, in, sizeof(in), out,
+					      sizeof(out));
+	if (!dcs->obj) {
+		DRV_LOG(DEBUG, "Can't allocate q counter set by DevX - error "
+			"%d.", errno);
+		rte_errno = errno;
+		mlx5_free(dcs);
+		return NULL;
+	}
+	dcs->id = MLX5_GET(alloc_q_counter_out, out, counter_set_id);
+	return dcs;
+}
+
+/**
+ * Query queue counters values.
+ *
+ * @param[in] dcs
+ *   devx object of the queue counter set.
+ * @param[in] clear
+ *   Whether hardware should clear the counters after the query or not.
+ *  @param[out] out_of_buffers
+ *   Number of dropped occurred due to lack of WQE for the associated QPs/RQs.
+ *
+ * @return
+ *   0 on success, a negative value otherwise.
+ */
+int
+mlx5_devx_cmd_queue_counter_query(struct mlx5_devx_obj *dcs, int clear,
+				  uint32_t *out_of_buffers)
+{
+	uint32_t out[MLX5_ST_SZ_BYTES(query_q_counter_out)] = {0};
+	uint32_t in[MLX5_ST_SZ_DW(query_q_counter_in)] = {0};
+	int rc;
+
+	MLX5_SET(query_q_counter_in, in, opcode,
+		 MLX5_CMD_OP_QUERY_Q_COUNTER);
+	MLX5_SET(query_q_counter_in, in, op_mod, 0);
+	MLX5_SET(query_q_counter_in, in, counter_set_id, dcs->id);
+	MLX5_SET(query_q_counter_in, in, clear, !!clear);
+	rc = mlx5_glue->devx_obj_query(dcs->obj, in, sizeof(in), out,
+				       sizeof(out));
+	if (rc) {
+		DRV_LOG(ERR, "Failed to query devx q counter set - rc %d", rc);
+		rte_errno = rc;
+		return -rc;
+	}
+	*out_of_buffers = MLX5_GET(query_q_counter_out, out, out_of_buffer);
+	return 0;
+}
diff --git a/drivers/common/mlx5/mlx5_devx_cmds.h b/drivers/common/mlx5/mlx5_devx_cmds.h
index f01d5a8..bc66d28 100644
--- a/drivers/common/mlx5/mlx5_devx_cmds.h
+++ b/drivers/common/mlx5/mlx5_devx_cmds.h
@@ -542,4 +542,10 @@ struct mlx5_devx_obj *mlx5_devx_cmd_create_flow_hit_aso_obj(void *ctx,
 
 __rte_internal
 int mlx5_devx_cmd_wq_query(void *wq, uint32_t *counter_set_id);
+
+__rte_internal
+struct mlx5_devx_obj *mlx5_devx_cmd_queue_counter_alloc(void *ctx);
+__rte_internal
+int mlx5_devx_cmd_queue_counter_query(struct mlx5_devx_obj *dcs, int clear,
+				      uint32_t *out_of_buffers);
 #endif /* RTE_PMD_MLX5_DEVX_CMDS_H_ */
diff --git a/drivers/common/mlx5/mlx5_prm.h b/drivers/common/mlx5/mlx5_prm.h
index f832715..01a039f 100644
--- a/drivers/common/mlx5/mlx5_prm.h
+++ b/drivers/common/mlx5/mlx5_prm.h
@@ -901,6 +901,8 @@ enum {
 	MLX5_CMD_OP_SUSPEND_QP = 0x50F,
 	MLX5_CMD_OP_RESUME_QP = 0x510,
 	MLX5_CMD_OP_QUERY_NIC_VPORT_CONTEXT = 0x754,
+	MLX5_CMD_OP_ALLOC_Q_COUNTER = 0x771,
+	MLX5_CMD_OP_QUERY_Q_COUNTER = 0x773,
 	MLX5_CMD_OP_ALLOC_PD = 0x800,
 	MLX5_CMD_OP_DEALLOC_PD = 0x801,
 	MLX5_CMD_OP_ACCESS_REGISTER = 0x805,
@@ -3213,6 +3215,85 @@ struct mlx5_ifc_query_regexp_register_out_bits {
 	u8 register_data[0x20];
 };
 
+/* Queue counters. */
+struct mlx5_ifc_alloc_q_counter_out_bits {
+	u8 status[0x8];
+	u8 reserved_at_8[0x18];
+	u8 syndrome[0x20];
+	u8 reserved_at_40[0x18];
+	u8 counter_set_id[0x8];
+	u8 reserved_at_60[0x20];
+};
+
+struct mlx5_ifc_alloc_q_counter_in_bits {
+	u8 opcode[0x10];
+	u8 uid[0x10];
+	u8 reserved_at_20[0x10];
+	u8 op_mod[0x10];
+	u8 reserved_at_40[0x40];
+};
+
+struct mlx5_ifc_query_q_counter_out_bits {
+	u8 status[0x8];
+	u8 reserved_at_8[0x18];
+	u8 syndrome[0x20];
+	u8 reserved_at_40[0x40];
+	u8 rx_write_requests[0x20];
+	u8 reserved_at_a0[0x20];
+	u8 rx_read_requests[0x20];
+	u8 reserved_at_e0[0x20];
+	u8 rx_atomic_requests[0x20];
+	u8 reserved_at_120[0x20];
+	u8 rx_dct_connect[0x20];
+	u8 reserved_at_160[0x20];
+	u8 out_of_buffer[0x20];
+	u8 reserved_at_1a0[0x20];
+	u8 out_of_sequence[0x20];
+	u8 reserved_at_1e0[0x20];
+	u8 duplicate_request[0x20];
+	u8 reserved_at_220[0x20];
+	u8 rnr_nak_retry_err[0x20];
+	u8 reserved_at_260[0x20];
+	u8 packet_seq_err[0x20];
+	u8 reserved_at_2a0[0x20];
+	u8 implied_nak_seq_err[0x20];
+	u8 reserved_at_2e0[0x20];
+	u8 local_ack_timeout_err[0x20];
+	u8 reserved_at_320[0xa0];
+	u8 resp_local_length_error[0x20];
+	u8 req_local_length_error[0x20];
+	u8 resp_local_qp_error[0x20];
+	u8 local_operation_error[0x20];
+	u8 resp_local_protection[0x20];
+	u8 req_local_protection[0x20];
+	u8 resp_cqe_error[0x20];
+	u8 req_cqe_error[0x20];
+	u8 req_mw_binding[0x20];
+	u8 req_bad_response[0x20];
+	u8 req_remote_invalid_request[0x20];
+	u8 resp_remote_invalid_request[0x20];
+	u8 req_remote_access_errors[0x20];
+	u8 resp_remote_access_errors[0x20];
+	u8 req_remote_operation_errors[0x20];
+	u8 req_transport_retries_exceeded[0x20];
+	u8 cq_overflow[0x20];
+	u8 resp_cqe_flush_error[0x20];
+	u8 req_cqe_flush_error[0x20];
+	u8 reserved_at_620[0x1e0];
+};
+
+struct mlx5_ifc_query_q_counter_in_bits {
+	u8 opcode[0x10];
+	u8 uid[0x10];
+	u8 reserved_at_20[0x10];
+	u8 op_mod[0x10];
+	u8 reserved_at_40[0x80];
+	u8 clear[0x1];
+	u8 reserved_at_c1[0x1f];
+	u8 reserved_at_e0[0x18];
+	u8 counter_set_id[0x8];
+};
+
 /* CQE format mask. */
 #define MLX5E_CQE_FORMAT_MASK 0xc
 
diff --git a/drivers/common/mlx5/version.map b/drivers/common/mlx5/version.map
index edd6c0e..91f3fa5 100644
--- a/drivers/common/mlx5/version.map
+++ b/drivers/common/mlx5/version.map
@@ -22,7 +22,7 @@ INTERNAL {
 	mlx5_devx_cmd_create_tis;
 	mlx5_devx_cmd_create_virtio_q_counters;
 	mlx5_devx_cmd_create_virtq;
-        mlx5_devx_cmd_create_flow_hit_aso_obj;
+	mlx5_devx_cmd_create_flow_hit_aso_obj;
 	mlx5_devx_cmd_create_geneve_tlv_option;
 	mlx5_devx_cmd_destroy;
 	mlx5_devx_cmd_flow_counter_alloc;
@@ -40,6 +40,8 @@ INTERNAL {
 	mlx5_devx_cmd_query_parse_samples;
 	mlx5_devx_cmd_query_virtio_q_counters;
 	mlx5_devx_cmd_query_virtq;
+	mlx5_devx_cmd_queue_counter_alloc;
+	mlx5_devx_cmd_queue_counter_query;
 	mlx5_devx_cmd_register_read;
 	mlx5_devx_cmd_wq_query;
 	mlx5_devx_get_out_command_status;
-- 
1.8.3.1