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RDMA/core: Introduce generic buffer descriptor infrastructure for umem

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Introduce a per-attribute UVERBS_ATTR_UMEM model so each uverbs
command's umem set is explicit in its UAPI definition. Add
driver-facing wrapper helpers that pin a umem on demand from an
attribute or a VA addr; the driver owns the returned umem and
releases it from its destroy/error paths.

Link: https://patch.msgid.link/r/20260529134312.2836341-4-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 15:42:59 +02:00
committed by Jason Gunthorpe
parent 28fb701c64
commit 3cfdff484d
5 changed files with 346 additions and 0 deletions
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27
include/uapi/rdma/ib_user_ioctl_verbs.h
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@@ -273,4 +273,31 @@ struct ib_uverbs_gid_entry {
__u32 netdev_ifindex; /* It is 0 if there is no netdev associated with it */
};
enum ib_uverbs_buffer_type {
IB_UVERBS_BUFFER_TYPE_DMABUF,
IB_UVERBS_BUFFER_TYPE_VA,
};
/*
* Describes a single buffer backed by dma-buf or user virtual address.
* Used as the payload of a per-attribute UVERBS_ATTR_UMEM-typed attribute.
*
* @type: buffer type from enum ib_uverbs_buffer_type
* @fd: dma-buf file descriptor (valid for IB_UVERBS_BUFFER_TYPE_DMABUF)
* @flags: required flags; the kernel rejects the call with -EINVAL if any
* bit is not understood. No bits are defined yet.
* @optional_flags: advisory flags; bits the kernel does not understand are
* silently ignored. No bits are defined yet.
* @addr: offset within dma-buf, or user virtual address for VA
* @length: buffer length in bytes
*/
struct ib_uverbs_buffer_desc {
__u32 type;
__s32 fd;
__u32 flags;
__u32 optional_flags;
__aligned_u64 addr;
__aligned_u64 length;
};
#endif