Re: [PATCH net-next v3 2/3] vsock: support SO_INQ on stream sockets

[Stefano Garzarella <sgarzare@redhat.com>]

On Fri, Oct 16, 2026 at 02:27:15PM +0100, David Carlier wrote:
>SO_INQ makes recvmsg() return the bytes left in the receive queue in an
>SCM_INQ cmsg, saving a SIOCINQ call per receive. AF_UNIX stream sockets
>support it, AF_VSOCK fails with ENOPROTOOPT.
>
>Add it for SOCK_STREAM, reusing the hint already computed for io_uring.
>As with TCP_INQ, 1 is reported once the stream is finished so the caller
>reads again and sees EOF, and accepted sockets inherit the setting from
>the listener. No cmsg is sent when the transport cannot report the queue
>length.
>
>SOCK_SEQPACKET is refused, as on AF_UNIX: its transport callback counts
>messages, not bytes.
>
>Signed-off-by: David Carlier <devnexen@gmail.com>
>---
> include/net/af_vsock.h   |  1 +
> net/vmw_vsock/af_vsock.c | 35 ++++++++++++++++++++++++++++++++---
> 2 files changed, 33 insertions(+), 3 deletions(-)

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>