[PATCH for-6.0 0/5] IORING_OP_SEND_ZC improvements

[Stefan Metzmacher <metze@samba.org>]

Hi Pavel, hi Jens,

I did some initial testing with IORING_OP_SEND_ZC.
While reading the code I think I found a race that
can lead to IORING_CQE_F_MORE being missing even if
the net layer got references.

While there I added some code to allow userpace to
know how effective the IORING_OP_SEND_ZC attempt was,
in order to avoid it it's not used (e.g. on a long living tcp
connection).

This change requires a change to the existing test, see:
https://github.com/metze-samba/liburing/tree/test-send-zerocopy

Stefan Metzmacher (5):
  io_uring/opdef: rename SENDZC_NOTIF to SEND_ZC
  io_uring/core: move io_cqe->fd over from io_cqe->flags to io_cqe->res
  io_uring/core: keep req->cqe.flags on generic errors
  io_uring/net: let io_sendzc set IORING_CQE_F_MORE before
    sock_sendmsg()
  io_uring/notif: let userspace know how effective the zero copy usage
    was

 include/linux/io_uring_types.h |  6 +++---
 io_uring/io_uring.c            | 18 +++++++++++++-----
 io_uring/net.c                 | 19 +++++++++++++------
 io_uring/notif.c               | 18 ++++++++++++++++++
 io_uring/opdef.c               |  2 +-
 net/ipv4/ip_output.c           |  3 ++-
 net/ipv4/tcp.c                 |  2 ++
 net/ipv6/ip6_output.c          |  3 ++-
 8 files changed, 54 insertions(+), 17 deletions(-)

-- 
2.34.1