[PATCH net-next 0/2] vsock: receive queue hint for io_uring

[David Carlier <devnexen@gmail.com>]

AF_VSOCK stream receives never fill msghdr.msg_inq. io_uring initialises the
hint to -1 and treats that as "unknown", so it cannot set
IORING_CQE_F_SOCK_NONEMPTY, and it speculatively retries a multishot receive
after every completion, including when the queue is already empty.

Patch 1 fills the hint at the common exit of __vsock_connectible_recvmsg(),
reusing vsock_stream_has_data(), the transport callback that SIOCINQ already
uses. Following tcp_inq_hint(), it reports a terminal hint of 1 once the
connection is finished, so the caller still performs the receive that
observes EOF. Patch 2 adds selftest coverage.

Numbers come from a ping-pong over vsock loopback using io_uring multishot
receive, 4 KiB messages, the queue drained between messages, with kernel
receives counted by a kprobe. The baseline is the same tree with patch 1
reverted:

  entries per delivered message   1.97 -> 1.00       (5000 messages)
  receiver CPU time, median       1.640s -> 1.587s   (-3.2%)
  receiver wall time, median      3.260s -> 3.183s   (-2.4%)

Timing is 25 runs of 50000 messages per kernel; CPU gives Mann-Whitney
p=0.006, wall time does not separate from noise (p=0.12), as expected for a
latency-bound workload.

The hint is gated to SOCK_STREAM; seqpacket is untouched. SO_INQ and SCM_INQ
are deliberately left out: they need their own per-socket state and
ancillary-message semantics, and a byte-count contract would have to account
for transports reporting less than the whole queue. That can follow.

Testing: built and run under virtme-ng on loopback, where the new cases pass
and vsock_test still passes 41 of 41 with a clean dmesg. Other transports
were reviewed but not tested. Hyper-V reports the current packet rather than
the whole queue and can return -EIO; an undercount only understates what is
readable, and a negative result leaves the caller's hint untouched.

David Carlier (2):
  vsock: report pending receive data to io_uring
  vsock/test: cover receive queue hints

 net/vmw_vsock/af_vsock.c               |  39 +++
 tools/testing/vsock/vsock_uring_test.c | 367 +++++++++++++++++++++++++
 2 files changed, 406 insertions(+)


base-commit: cea851523034d83dc61d882b1a6a3ad273480f7b
-- 
2.55.0