[PATCH v1 03/10] common/mlx5: extend SQ modify to support rate limit update

[Vincent Jardin]

Add rl_update and packet_pacing_rate_limit_index fields to
mlx5_devx_modify_sq_attr. When rl_update is set, the modify SQ
command sets modify_bitmask bit 0 and writes the PP index into
the SQ context, allowing dynamic rate changes on a live RDY SQ
without teardown.

modify_sq_in.modify_bitmask[0x40] bit 0 controls the
packet_pacing_rate_limit_index.

Supported hardware:
- ConnectX-6 Dx: per-SQ rate via packet_pacing_rate_limit_index
- ConnectX-7/8: same SQ context field, also supports wait-on-time
- BlueField-2/3: same modify_sq command support

Not supported:
- ConnectX-5: supports packet_pacing but only at SQ creation time,
  dynamic modify_bitmask update may not be supported on all FW
- ConnectX-4 Lx and earlier: no packet_pacing support

Signed-off-by: Vincent Jardin <vjardin at free.fr>
---
 drivers/common/mlx5/mlx5_devx_cmds.c | 5 +++++
 drivers/common/mlx5/mlx5_devx_cmds.h | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/drivers/common/mlx5/mlx5_devx_cmds.c b/drivers/common/mlx5/mlx5_devx_cmds.c
index 8f53303fa7..17378e1753 100644
--- a/drivers/common/mlx5/mlx5_devx_cmds.c
+++ b/drivers/common/mlx5/mlx5_devx_cmds.c
@@ -2129,6 +2129,11 @@ mlx5_devx_cmd_modify_sq(struct mlx5_devx_obj *sq,
 	MLX5_SET(sqc, sq_ctx, state, sq_attr->state);
 	MLX5_SET(sqc, sq_ctx, hairpin_peer_rq, sq_attr->hairpin_peer_rq);
 	MLX5_SET(sqc, sq_ctx, hairpin_peer_vhca, sq_attr->hairpin_peer_vhca);
+	if (sq_attr->rl_update) {
+		MLX5_SET64(modify_sq_in, in, modify_bitmask, 1);
+		MLX5_SET(sqc, sq_ctx, packet_pacing_rate_limit_index,
+			 sq_attr->packet_pacing_rate_limit_index);
+	}
 	ret = mlx5_glue->devx_obj_modify(sq->obj, in, sizeof(in),
 					 out, sizeof(out));
 	if (ret) {
diff --git a/drivers/common/mlx5/mlx5_devx_cmds.h b/drivers/common/mlx5/mlx5_devx_cmds.h
index 930ae2c072..82d949972b 100644
--- a/drivers/common/mlx5/mlx5_devx_cmds.h
+++ b/drivers/common/mlx5/mlx5_devx_cmds.h
@@ -519,6 +519,9 @@ struct mlx5_devx_modify_sq_attr {
 	uint32_t state:4;
 	uint32_t hairpin_peer_rq:24;
 	uint32_t hairpin_peer_vhca:16;
+	uint32_t rl_update:1;
+	/* Set to update packet_pacing_rate_limit_index on a live SQ. */
+	uint32_t packet_pacing_rate_limit_index:16;
 };
 
 
-- 
2.43.0