diff options
| author | Pavel Begunkov <asml.silence@gmail.com> | 2025-11-13 10:48:57 +0000 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-11-13 11:17:36 -0700 |
| commit | 2647e2ecc096d2330d6b6a34a3a1f0a99828c14c (patch) | |
| tree | 1f20abbbbbe646e315665c08c21978f46f049453 /include/uapi/linux | |
| parent | d741c6255524f0691aea53381219fadcd2b38408 (diff) | |
io_uring/query: introduce zcrx query
Add a new query type IO_URING_QUERY_ZCRX returning the user some basic
information about the interface, which includes allowed flags for areas
and registration and supported IORING_REGISTER_ZCRX_CTRL subcodes.
There is also a chicken-egg problem with user provided refill queue
memory, where offsets and size information is returned after
registration, but to properly allocate memory you need to know it
beforehand, which is why the userspace currently has to guess the RQ
headers size and severely overestimates it. Return the size information.
It's split into "size" and "alignment" fields because for default
placement modes the user is interested in the aligned size, however if
it gets support for more flexible placement, it'll need to only know the
actual header size.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/io_uring/query.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/include/uapi/linux/io_uring/query.h b/include/uapi/linux/io_uring/query.h index 3539ccbfd064..fc0cb1580e47 100644 --- a/include/uapi/linux/io_uring/query.h +++ b/include/uapi/linux/io_uring/query.h @@ -18,6 +18,7 @@ struct io_uring_query_hdr { enum { IO_URING_QUERY_OPCODES = 0, + IO_URING_QUERY_ZCRX = 1, __IO_URING_QUERY_MAX, }; @@ -41,4 +42,19 @@ struct io_uring_query_opcode { __u32 __pad; }; +struct io_uring_query_zcrx { + /* Bitmask of supported ZCRX_REG_* flags, */ + __u64 register_flags; + /* Bitmask of all supported IORING_ZCRX_AREA_* flags */ + __u64 area_flags; + /* The number of supported ZCRX_CTRL_* opcodes */ + __u32 nr_ctrl_opcodes; + __u32 __resv1; + /* The refill ring header size */ + __u32 rq_hdr_size; + /* The alignment for the header */ + __u32 rq_hdr_alignment; + __u64 __resv2; +}; + #endif |