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

[Stefano Garzarella]

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@xxxxxxxxx>
> ---
> 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@xxxxxxxxxx>