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RDMA/mlx5: Use UMEM attribute for QP doorbell record

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Add an optional mlx5 driver-namespace UMEM attribute on QP
create so userspace can supply the doorbell record umem
explicitly, symmetric to the CQ side. 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_QP UAPI definition chain to
attach the new attr.

Link: https://patch.msgid.link/r/20260529134312.2836341-17-jiri@resnulli.us
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jiri Pirko
2026-05-29 15:43:12 +02:00
committed by Jason Gunthorpe
parent d6ab1d2439
commit 93ce776a5b
4 changed files with 24 additions and 1 deletions
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1
drivers/infiniband/hw/mlx5/main.c
View File

@@ -4456,6 +4456,7 @@ static const struct uapi_definition mlx5_ib_defs[] = {
UAPI_DEF_CHAIN(mlx5_ib_std_types_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_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

@@ -1511,6 +1511,7 @@ extern const struct uapi_definition mlx5_ib_flow_defs[];
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[];
static inline int is_qp1(enum ib_qp_type qp_type)
{

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

@@ -44,6 +44,9 @@
#include "qp.h"
#include "wr.h"
#define UVERBS_MODULE_NAME mlx5_ib
#include <rdma/uverbs_named_ioctl.h>
enum {
MLX5_IB_ACK_REQ_FREQ = 8,
};
@@ -1053,7 +1056,9 @@ static int _create_user_qp(struct mlx5_ib_dev *dev, struct ib_pd *pd,
resp->bfreg_index = MLX5_IB_INVALID_BFREG;
qp->bfregn = bfregn;
err = mlx5_ib_db_map_user(context, NULL, 0, ucmd->db_addr, &qp->db);
err = mlx5_ib_db_map_user(context, attrs,
MLX5_IB_ATTR_CREATE_QP_DBR_BUF_UMEM,
ucmd->db_addr, &qp->db);
if (err) {
mlx5_ib_dbg(dev, "map failed\n");
goto err_free;
@@ -5877,3 +5882,15 @@ void mlx5_ib_qp_event_cleanup(void)
{
destroy_workqueue(mlx5_ib_qp_event_wq);
}
ADD_UVERBS_ATTRIBUTES_SIMPLE(
mlx5_ib_qp_create,
UVERBS_OBJECT_QP,
UVERBS_METHOD_QP_CREATE,
UVERBS_ATTR_UMEM(MLX5_IB_ATTR_CREATE_QP_DBR_BUF_UMEM,
UA_OPTIONAL));
const struct uapi_definition mlx5_ib_create_qp_defs[] = {
UAPI_DEF_CHAIN_OBJ_TREE(UVERBS_OBJECT_QP, &mlx5_ib_qp_create),
{},
};

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

@@ -277,6 +277,10 @@ enum mlx5_ib_create_cq_attrs {
MLX5_IB_ATTR_CREATE_CQ_DBR_BUF_UMEM,
};
enum mlx5_ib_create_qp_attrs {
MLX5_IB_ATTR_CREATE_QP_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),
};