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Message-ID: <20250702223606.1054680-1-kuniyu@google.com>
Date: Wed,  2 Jul 2025 22:35:12 +0000
From: Kuniyuki Iwashima <kuniyu@...gle.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>, 
	Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: [PATCH v1 net-next 0/7] af_unix: Introduce SO_INQ & SCM_INQ.

We have an application that uses almost the same code for TCP and
AF_UNIX (SOCK_STREAM).

The application uses TCP_INQ for TCP, but AF_UNIX doesn't have it
and requires an extra syscall, ioctl(SIOCINQ) or getsockopt(SO_MEMINFO)
as an alternative.

Also, ioctl(SIOCINQ) for AF_UNIX SOCK_STREAM is more expensive because
it needs to iterate all skb in the receive queue.

This series adds a cached field for SIOCINQ to speed it up and introduce
SO_INQ, the generic version of TCP_INQ to get the queue length as cmsg in
each recvmsg().


Kuniyuki Iwashima (7):
  af_unix: Don't hold unix_state_lock() in __unix_dgram_recvmsg().
  af_unix: Don't check SOCK_DEAD in unix_stream_read_skb().
  af_unix: Don't use skb_recv_datagram() in unix_stream_read_skb().
  af_unix: Use cached value for SOCK_STREAM in unix_inq_len().
  af_unix: Cache state->msg in unix_stream_read_generic().
  af_unix: Introduce SO_INQ.
  selftest: af_unix: Add test for SO_INQ.

 arch/alpha/include/uapi/asm/socket.h          |   3 +
 arch/mips/include/uapi/asm/socket.h           |   3 +
 arch/parisc/include/uapi/asm/socket.h         |   3 +
 arch/sparc/include/uapi/asm/socket.h          |   3 +
 include/net/af_unix.h                         |   2 +
 include/uapi/asm-generic/socket.h             |   3 +
 net/unix/af_unix.c                            | 180 ++++++++++++------
 tools/testing/selftests/net/.gitignore        |   1 +
 tools/testing/selftests/net/af_unix/Makefile  |   2 +-
 tools/testing/selftests/net/af_unix/scm_inq.c | 125 ++++++++++++
 10 files changed, 269 insertions(+), 56 deletions(-)
 create mode 100644 tools/testing/selftests/net/af_unix/scm_inq.c

-- 
2.50.0.727.gbf7dc18ff4-goog


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