[PATCH 0/4] implement vectored registered buffers for sendzc

[Pavel Begunkov <asml.silence@gmail.com>]

Allow registered buffers to be used with zerocopy sendmsg, where the
passed iovec becomes a scatter list into the registered buffer
specified by sqe->buf_index. See patches 3 and 4 for more details.

To get performance out of it, it'll need a bit more work on top for
optimising allocations and cleaning up send setups. We can also
implement it for non zerocopy variants and reads/writes in the future.

Tested by enabling it in test/send-zerocopy.c, which checks payloads,
and exercises lots of corner cases, especially around send sizes,
offsets and non aligned registered buffers.

Pavel Begunkov (4):
  io_uring/net: introduce io_kmsg_set_iovec
  io_uring/net: allow mixed bvec/iovec caching
  io_uring: vectored registered buffer import
  io_uring/net: sendzc with vectored fixed buffers

 io_uring/net.c  | 132 +++++++++++++++++++++++++++++++++---------------
 io_uring/net.h  |   4 +-
 io_uring/rsrc.c |  60 ++++++++++++++++++++++
 io_uring/rsrc.h |   3 ++
 4 files changed, 156 insertions(+), 43 deletions(-)

-- 
2.46.0