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RDMA/mlx5: Use UMEM attribute for SRQ doorbell record

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Add an optional mlx5 driver-namespace UMEM attribute on SRQ create so
userspace can supply the doorbell record umem explicitly, symmetric to
the CQ and QP sides. Resolve it inside mlx5_ib_db_map_user() and use it
as a private DBR page when present; otherwise take the existing UHW
share-or-pin path that preserves per-page DBR sharing across CQ/QP/SRQ
in the same process.

Add mlx5's first UVERBS_OBJECT_SRQ UAPI definition chain to attach the
new attr.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Link: https://patch.msgid.link/20260701124015.64350-4-jiri@resnulli.us
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Jiri Pirko 2026-07-01 14:40:15 +02:00 committed by Leon Romanovsky
parent 023349192e
commit aac287f4f1
4 changed files with 24 additions and 1 deletions
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1
drivers/infiniband/hw/mlx5/main.c
View File

@ -4476,6 +4476,7 @@ static const struct uapi_definition mlx5_ib_defs[] = {
UAPI_DEF_CHAIN(mlx5_ib_dm_defs),
UAPI_DEF_CHAIN(mlx5_ib_create_cq_defs),
UAPI_DEF_CHAIN(mlx5_ib_create_qp_defs),
UAPI_DEF_CHAIN(mlx5_ib_create_srq_defs),
UAPI_DEF_CHAIN_OBJ_TREE(UVERBS_OBJECT_DEVICE, &mlx5_ib_query_context),
UAPI_DEF_CHAIN_OBJ_TREE(UVERBS_OBJECT_MR, &mlx5_ib_reg_dmabuf_mr),

1
drivers/infiniband/hw/mlx5/mlx5_ib.h
View File

@ -1517,6 +1517,7 @@ extern const struct uapi_definition mlx5_ib_qos_defs[];
extern const struct uapi_definition mlx5_ib_std_types_defs[];
extern const struct uapi_definition mlx5_ib_create_cq_defs[];
extern const struct uapi_definition mlx5_ib_create_qp_defs[];
extern const struct uapi_definition mlx5_ib_create_srq_defs[];
static inline int is_qp1(enum ib_qp_type qp_type)
{

19
drivers/infiniband/hw/mlx5/srq.c
View File

@ -10,6 +10,9 @@
#include "mlx5_ib.h"
#include "srq.h"
#define UVERBS_MODULE_NAME mlx5_ib
#include <rdma/uverbs_named_ioctl.h>
static void *get_wqe(struct mlx5_ib_srq *srq, int n)
{
return mlx5_frag_buf_get_wqe(&srq->fbc, n);
@ -78,7 +81,9 @@ static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq,
}
in->umem = srq->umem;
err = mlx5_ib_db_map_user(ucontext, NULL, 0, ucmd.db_addr, &srq->db);
err = mlx5_ib_db_map_user(ucontext, attrs,
MLX5_IB_ATTR_CREATE_SRQ_DBR_BUF_UMEM,
ucmd.db_addr, &srq->db);
if (err) {
mlx5_ib_dbg(dev, "map doorbell failed\n");
goto err_umem;
@ -466,3 +471,15 @@ int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
return err;
}
ADD_UVERBS_ATTRIBUTES_SIMPLE(
mlx5_ib_srq_create,
UVERBS_OBJECT_SRQ,
UVERBS_METHOD_SRQ_CREATE,
UVERBS_ATTR_UMEM(MLX5_IB_ATTR_CREATE_SRQ_DBR_BUF_UMEM,
UA_OPTIONAL));
const struct uapi_definition mlx5_ib_create_srq_defs[] = {
UAPI_DEF_CHAIN_OBJ_TREE(UVERBS_OBJECT_SRQ, &mlx5_ib_srq_create),
{},
};

4
include/uapi/rdma/mlx5_user_ioctl_cmds.h
View File

@ -281,6 +281,10 @@ enum mlx5_ib_create_qp_attrs {
MLX5_IB_ATTR_CREATE_QP_DBR_BUF_UMEM = UVERBS_ID_DRIVER_NS_WITH_UHW,
};
enum mlx5_ib_create_srq_attrs {
MLX5_IB_ATTR_CREATE_SRQ_DBR_BUF_UMEM = UVERBS_ID_DRIVER_NS_WITH_UHW,
};
enum mlx5_ib_reg_dmabuf_mr_attrs {
MLX5_IB_ATTR_REG_DMABUF_MR_ACCESS_FLAGS = (1U << UVERBS_ID_NS_SHIFT),
};