[PATCH RFC 0/7] tx timestamp io_uring commands

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

Vadim expressed interest in having an io_uring API for tx timestamping,
and the series implements a rough prototype to support that. It
introduces a new socket command, which works in a multishot polling
mode, i.e. it polls the socket and posts CQEs when a timestamp arrives.
It reuses most of the bits on the networking side by grabbing timestamp
skbs from the socket's error queue.

The ABI and net bits like skb parsing will need to be discussed and
ironed before posting a non-RFC version.

Pavel Begunkov (7):
  io_uring: delete misleading comment in io_fill_cqe_aux()
  io_uring/cmd: move net cmd into a separate file
  net: timestamp: add helper returning skb's tx tstamp
  io_uring/poll: introduce io_arm_apoll()
  io_uring/cmd: allow multishot polled commands
  io_uring: add mshot helper for posting CQE32
  io_uring/cmd: add tx timestamping cmd support

 include/net/sock.h            |   3 +
 include/uapi/linux/io_uring.h |   6 ++
 io_uring/Makefile             |   1 +
 io_uring/cmd_net.c            | 177 ++++++++++++++++++++++++++++++++++
 io_uring/io_uring.c           |  46 ++++++++-
 io_uring/io_uring.h           |   1 +
 io_uring/poll.c               |  43 +++++----
 io_uring/poll.h               |   1 +
 io_uring/uring_cmd.c          |  97 +++++--------------
 io_uring/uring_cmd.h          |   7 ++
 net/socket.c                  |  32 ++++++
 11 files changed, 319 insertions(+), 95 deletions(-)
 create mode 100644 io_uring/cmd_net.c

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2.48.1