• Jens Axboe's avatar
    io_uring: add IORING_OP_PROVIDE_BUFFERS · ddf0322d
    Jens Axboe authored
    IORING_OP_PROVIDE_BUFFERS uses the buffer registration infrastructure to
    support passing in an addr/len that is associated with a buffer ID and
    buffer group ID. The group ID is used to index and lookup the buffers,
    while the buffer ID can be used to notify the application which buffer
    in the group was used. The addr passed in is the starting buffer address,
    and length is each buffer length. A number of buffers to add with can be
    specified, in which case addr is incremented by length for each addition,
    and each buffer increments the buffer ID specified.
    
    No validation is done of the buffer ID. If the application provides
    buffers within the same group with identical buffer IDs, then it'll have
    a hard time telling which buffer ID was used. The only restriction is
    that the buffer ID can be a max of 16-bits in size, so USHRT_MAX is the
    maximum ID that can be used.
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    ddf0322d
io_uring.c 177 KB