[PATCH v1 02/10] common/mlx5: query packet pacing rate table capabilities

[Vincent Jardin]

Query additional QoS packet pacing capabilities from HCA attributes:
- packet_pacing_burst_bound: HW supports burst_upper_bound parameter
- packet_pacing_typical_size: HW supports typical_packet_size parameter
- packet_pacing_max_rate / packet_pacing_min_rate: rate range in kbps
- packet_pacing_rate_table_size: number of HW rate table entries

These capabilities are needed by the upcoming per-queue rate limiting
feature to validate devarg values and report HW limits.

Supported hardware:
- ConnectX-6 Dx and later (different boards expose different subsets)
- ConnectX-5 reports packet_pacing but not all extended fields
- ConnectX-7/8 report the full capability set
- BlueField-2 and later DPUs also report these capabilities

Not supported:
- ConnectX-4 Lx and earlier (no packet_pacing capability at all)
- ConnectX-5 Ex may not report burst_bound or typical_size

Signed-off-by: Vincent Jardin <vjardin at free.fr>
---
 drivers/common/mlx5/mlx5_devx_cmds.c | 15 +++++++++++++++
 drivers/common/mlx5/mlx5_devx_cmds.h | 11 ++++++++++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/common/mlx5/mlx5_devx_cmds.c b/drivers/common/mlx5/mlx5_devx_cmds.c
index d12ebf8487..8f53303fa7 100644
--- a/drivers/common/mlx5/mlx5_devx_cmds.c
+++ b/drivers/common/mlx5/mlx5_devx_cmds.c
@@ -1244,6 +1244,21 @@ mlx5_devx_cmd_query_hca_attr(void *ctx,
 				MLX5_GET(qos_cap, hcattr, packet_pacing);
 		attr->qos.wqe_rate_pp =
 				MLX5_GET(qos_cap, hcattr, wqe_rate_pp);
+		attr->qos.packet_pacing_burst_bound =
+				MLX5_GET(qos_cap, hcattr,
+					packet_pacing_burst_bound);
+		attr->qos.packet_pacing_typical_size =
+				MLX5_GET(qos_cap, hcattr,
+					packet_pacing_typical_size);
+		attr->qos.packet_pacing_max_rate =
+				MLX5_GET(qos_cap, hcattr,
+					packet_pacing_max_rate);
+		attr->qos.packet_pacing_min_rate =
+				MLX5_GET(qos_cap, hcattr,
+					packet_pacing_min_rate);
+		attr->qos.packet_pacing_rate_table_size =
+				MLX5_GET(qos_cap, hcattr,
+					packet_pacing_rate_table_size);
 		if (attr->qos.flow_meter_aso_sup) {
 			attr->qos.log_meter_aso_granularity =
 				MLX5_GET(qos_cap, hcattr,
diff --git a/drivers/common/mlx5/mlx5_devx_cmds.h b/drivers/common/mlx5/mlx5_devx_cmds.h
index da50fc686c..930ae2c072 100644
--- a/drivers/common/mlx5/mlx5_devx_cmds.h
+++ b/drivers/common/mlx5/mlx5_devx_cmds.h
@@ -67,7 +67,16 @@ struct mlx5_hca_qos_attr {
 	/* Power of the maximum allocation granularity Object. */
 	uint32_t log_max_num_meter_aso:5;
 	/* Power of the maximum number of supported objects. */
-
+	uint32_t packet_pacing_burst_bound:1;
+	/* HW supports burst_upper_bound PP parameter. */
+	uint32_t packet_pacing_typical_size:1;
+	/* HW supports typical_packet_size PP parameter. */
+	uint32_t packet_pacing_max_rate;
+	/* Maximum supported pacing rate in kbps. */
+	uint32_t packet_pacing_min_rate;
+	/* Minimum supported pacing rate in kbps. */
+	uint16_t packet_pacing_rate_table_size;
+	/* Number of entries in the HW rate table. */
 };
 
 struct mlx5_hca_vdpa_attr {
-- 
2.43.0