From: Noa Osherovich <noaos@xxxxxxxxxxxx>
A Multi-Packet RQ is a receive queue where multiple packets are
written to the same WQE. Each message starts in the beginning of a
stride. The total size of the scatter elements of each WQE is
determined upon RQ creation and all the posted WQEs should meet the
determined size.
A Multi-Packet RQ reduces the number of needed post-recv operations
thus increasing performance.
It reduces memory footprint by allowing each packet to consume a
different number of strides instead of the whole WR.
Signed-off-by: Noa Osherovich <noaos@xxxxxxxxxxxx>
Reviewed-by: Yishai Hadas <yishaih@xxxxxxxxxxxx>
---
providers/mlx5/man/mlx5dv_query_device.3 | 14 +++++++++++++-
providers/mlx5/mlx5-abi.h | 6 ++++++
providers/mlx5/mlx5.c | 5 +++++
providers/mlx5/mlx5.h | 1 +
providers/mlx5/mlx5dv.h | 12 +++++++++++-
providers/mlx5/verbs.c | 1 +
6 files changed, 37 insertions(+), 2 deletions(-)
diff --git a/providers/mlx5/man/mlx5dv_query_device.3 b/providers/mlx5/man/mlx5dv_query_device.3
index eca6fc1..f7cfdc0 100644
--- a/providers/mlx5/man/mlx5dv_query_device.3
+++ b/providers/mlx5/man/mlx5dv_query_device.3
@@ -29,6 +29,17 @@ uint32_t supported_qpts;
};
.PP
.nf
+struct mlx5dv_striding_rq_caps {
+.in +8
+uint32_t min_single_stride_log_num_of_bytes; /* min log size of each stride */
+uint32_t max_single_stride_log_num_of_bytes; /* max log size of each stride */
+uint32_t min_single_wqe_log_num_of_strides; /* min log number of strides per WQE */
+uint32_t max_single_wqe_log_num_of_strides; /* max log number of strides per WQE */
+uint32_t supported_qpts;
+.in -8
+};
+.PP
+.nf
struct mlx5dv_context {
.in +8
uint8_t version;
@@ -59,7 +70,8 @@ enum mlx5dv_context_comp_mask {
.in +8
MLX5DV_CONTEXT_MASK_CQE_COMPRESION = 1 << 0,
MLX5DV_CONTEXT_MASK_SWP = 1 << 1,
-MLX5DV_CONTEXT_MASK_RESERVED = 1 << 2,
+MLX5DV_CONTEXT_MASK_STRIDING_RQ = 1 << 2,
+MLX5DV_CONTEXT_MASK_RESERVED = 1 << 3,
.in -8
};
diff --git a/providers/mlx5/mlx5-abi.h b/providers/mlx5/mlx5-abi.h
index e1f5114..b569bd4 100644
--- a/providers/mlx5/mlx5-abi.h
+++ b/providers/mlx5/mlx5-abi.h
@@ -288,6 +288,11 @@ enum mlx5_query_dev_resp_flags {
MLX5_QUERY_DEV_RESP_FLAGS_CQE_128B_PAD = 1 << 1,
};
+struct mlx5_striding_rq_caps {
+ struct mlx5dv_striding_rq_caps caps;
+ __u32 reserved;
+};
+
struct mlx5_query_device_ex_resp {
struct ibv_query_device_resp_ex ibv_resp;
__u32 comp_mask;
@@ -299,6 +304,7 @@ struct mlx5_query_device_ex_resp {
__u32 support_multi_pkt_send_wqe;
__u32 flags; /* Use enum mlx5_query_dev_resp_flags */
struct mlx5dv_sw_parsing_caps sw_parsing_caps;
+ struct mlx5_striding_rq_caps striding_rq_caps;
};
#endif /* MLX5_ABI_H */
diff --git a/providers/mlx5/mlx5.c b/providers/mlx5/mlx5.c
index 70afbd4..36b47d7 100644
--- a/providers/mlx5/mlx5.c
+++ b/providers/mlx5/mlx5.c
@@ -641,6 +641,11 @@ int mlx5dv_query_device(struct ibv_context *ctx_in,
comp_mask_out |= MLX5DV_CONTEXT_MASK_SWP;
}
+ if (attrs_out->comp_mask & MLX5DV_CONTEXT_MASK_STRIDING_RQ) {
+ attrs_out->striding_rq_caps = mctx->striding_rq_caps;
+ comp_mask_out |= MLX5DV_CONTEXT_MASK_STRIDING_RQ;
+ }
+
attrs_out->comp_mask = comp_mask_out;
return 0;
diff --git a/providers/mlx5/mlx5.h b/providers/mlx5/mlx5.h
index b4782dd..7c85ab6 100644
--- a/providers/mlx5/mlx5.h
+++ b/providers/mlx5/mlx5.h
@@ -292,6 +292,7 @@ struct mlx5_context {
struct mlx5dv_cqe_comp_caps cqe_comp_caps;
struct mlx5dv_ctx_allocators extern_alloc;
struct mlx5dv_sw_parsing_caps sw_parsing_caps;
+ struct mlx5dv_striding_rq_caps striding_rq_caps;
};
struct mlx5_bitmap {
diff --git a/providers/mlx5/mlx5dv.h b/providers/mlx5/mlx5dv.h
index 935ff54..3566bcb 100644
--- a/providers/mlx5/mlx5dv.h
+++ b/providers/mlx5/mlx5dv.h
@@ -60,7 +60,8 @@ enum {
enum mlx5dv_context_comp_mask {
MLX5DV_CONTEXT_MASK_CQE_COMPRESION = 1 << 0,
MLX5DV_CONTEXT_MASK_SWP = 1 << 1,
- MLX5DV_CONTEXT_MASK_RESERVED = 1 << 2,
+ MLX5DV_CONTEXT_MASK_STRIDING_RQ = 1 << 2,
+ MLX5DV_CONTEXT_MASK_RESERVED = 1 << 3,
};
struct mlx5dv_cqe_comp_caps {
@@ -73,6 +74,14 @@ struct mlx5dv_sw_parsing_caps {
uint32_t supported_qpts;
};
+struct mlx5dv_striding_rq_caps {
+ uint32_t min_single_stride_log_num_of_bytes;
+ uint32_t max_single_stride_log_num_of_bytes;
+ uint32_t min_single_wqe_log_num_of_strides;
+ uint32_t max_single_wqe_log_num_of_strides;
+ uint32_t supported_qpts;
+};
+
/*
* Direct verbs device-specific attributes
*/
@@ -82,6 +91,7 @@ struct mlx5dv_context {
uint64_t comp_mask;
struct mlx5dv_cqe_comp_caps cqe_comp_caps;
struct mlx5dv_sw_parsing_caps sw_parsing_caps;
+ struct mlx5dv_striding_rq_caps striding_rq_caps;
};
enum mlx5dv_context_flags {
diff --git a/providers/mlx5/verbs.c b/providers/mlx5/verbs.c
index 9187119..dc12cd8 100644
--- a/providers/mlx5/verbs.c
+++ b/providers/mlx5/verbs.c
@@ -2157,6 +2157,7 @@ int mlx5_query_device_ex(struct ibv_context *context,
mctx->cqe_comp_caps = resp.cqe_comp_caps;
mctx->sw_parsing_caps = resp.sw_parsing_caps;
+ mctx->striding_rq_caps = resp.striding_rq_caps.caps;
if (resp.flags & MLX5_QUERY_DEV_RESP_FLAGS_CQE_128B_COMP)
mctx->vendor_cap_flags |= MLX5_VENDOR_CAP_FLAGS_CQE_128B_COMP;
--
1.8.3.1
--
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