diff options
| author | Jiri Pirko <jiri@nvidia.com> | 2026-05-29 15:42:59 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2026-05-29 20:19:57 -0300 |
| commit | 3cfdff484d84f04716ae56063a8dac3773bd3f29 (patch) | |
| tree | 5cea0a5fb2a22cc49c668831a4eafabc933d1bc8 /include/uapi/rdma | |
| parent | 28fb701c642b8ff73e08fabef9265b508509d820 (diff) | |
RDMA/core: Introduce generic buffer descriptor infrastructure for umem
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>
Diffstat (limited to 'include/uapi/rdma')
| -rw-r--r-- | include/uapi/rdma/ib_user_ioctl_verbs.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/uapi/rdma/ib_user_ioctl_verbs.h b/include/uapi/rdma/ib_user_ioctl_verbs.h index 90c5cd8e7753..51030c27d479 100644 --- a/include/uapi/rdma/ib_user_ioctl_verbs.h +++ b/include/uapi/rdma/ib_user_ioctl_verbs.h @@ -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 |