[PATCH rdma-next v3 1/3] RDMA/uverbs: Add SRQ buffer UMEM attribute

[Jiri Pirko <jiri@resnulli.us>]

From: Jiri Pirko <jiri@nvidia.com>

Apply the per-attribute UMEM model to the SRQ create method. Add an
optional UMEM attribute that backs the SRQ WQE buffer, so userspace can
supply it as either a VA or a dma-buf through a single descriptor,
consistent with the CQ and QP create methods.

mlx5 is the only driver that pins an SRQ WQE buffer via umem; it maps a
single ucmd->buf_addr region through this attribute. No other driver
implements a user SRQ buffer, so none of them use the attribute.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 drivers/infiniband/core/uverbs_std_types_srq.c | 2 ++
 include/uapi/rdma/ib_user_ioctl_cmds.h         | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/infiniband/core/uverbs_std_types_srq.c b/drivers/infiniband/core/uverbs_std_types_srq.c
index e5513f828bdc..0421bdd225df 100644
--- a/drivers/infiniband/core/uverbs_std_types_srq.c
+++ b/drivers/infiniband/core/uverbs_std_types_srq.c
@@ -192,6 +192,8 @@ DECLARE_UVERBS_NAMED_METHOD(
 	UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_CREATE_SRQ_RESP_SRQ_NUM,
 			   UVERBS_ATTR_TYPE(u32),
 			   UA_OPTIONAL),
+	UVERBS_ATTR_UMEM(UVERBS_ATTR_CREATE_SRQ_BUF_UMEM,
+			 UA_OPTIONAL),
 	UVERBS_ATTR_UHW());
 
 static int UVERBS_HANDLER(UVERBS_METHOD_SRQ_DESTROY)(
diff --git a/include/uapi/rdma/ib_user_ioctl_cmds.h b/include/uapi/rdma/ib_user_ioctl_cmds.h
index 839835bd4b23..1fef1e86b302 100644
--- a/include/uapi/rdma/ib_user_ioctl_cmds.h
+++ b/include/uapi/rdma/ib_user_ioctl_cmds.h
@@ -189,6 +189,7 @@ enum uverbs_attrs_create_srq_cmd_attr_ids {
 	UVERBS_ATTR_CREATE_SRQ_RESP_MAX_WR,
 	UVERBS_ATTR_CREATE_SRQ_RESP_MAX_SGE,
 	UVERBS_ATTR_CREATE_SRQ_RESP_SRQ_NUM,
+	UVERBS_ATTR_CREATE_SRQ_BUF_UMEM,
 };
 
 enum uverbs_attrs_destroy_srq_cmd_attr_ids {
-- 
2.54.0