linux-kernel - Re: [PATCH net-next v2 1/3] vsock: Add support for SIOCINQ ioctl

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Message-ID: <mrib74zhrw47v4juifp67phnm6tffb7qgfm3xmtcuw5maminlv@4i7z36hg3554>
Date: Mon, 16 Jun 2025 16:30:32 +0200
From: Luigi Leonardi <leonardi@...hat.com>
To: Xuewei Niu <niuxuewei97@...il.com>
Cc: sgarzare@...hat.com, mst@...hat.com, pabeni@...hat.com, 
	jasowang@...hat.com, xuanzhuo@...ux.alibaba.com, davem@...emloft.net, 
	netdev@...r.kernel.org, stefanha@...hat.com, virtualization@...ts.linux.dev, 
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, fupan.lfp@...group.com, 
	Xuewei Niu <niuxuewei.nxw@...group.com>
Subject: Re: [PATCH net-next v2 1/3] vsock: Add support for SIOCINQ ioctl

On Mon, Jun 16, 2025 at 03:42:53PM +0200, Luigi Leonardi wrote:
>On Fri, Jun 13, 2025 at 11:11:50AM +0800, Xuewei Niu wrote:
>>This patch adds support for SIOCINQ ioctl, which returns the number of
>>bytes unread in the socket.
>>
>>Signed-off-by: Xuewei Niu <niuxuewei.nxw@...group.com>
>>---
>>include/net/af_vsock.h   |  2 ++
>>net/vmw_vsock/af_vsock.c | 22 ++++++++++++++++++++++
>>2 files changed, 24 insertions(+)
>>
>>diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
>>index d56e6e135158..723a886253ba 100644
>>--- a/include/net/af_vsock.h
>>+++ b/include/net/af_vsock.h
>>@@ -171,6 +171,8 @@ struct vsock_transport {
>>
>>	/* SIOCOUTQ ioctl */
>>	ssize_t (*unsent_bytes)(struct vsock_sock *vsk);
>>+	/* SIOCINQ ioctl */
>>+	ssize_t (*unread_bytes)(struct vsock_sock *vsk);
>>
>>	/* Shutdown. */
>>	int (*shutdown)(struct vsock_sock *, int);
>>diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>>index 2e7a3034e965..466b1ebadbbc 100644
>>--- a/net/vmw_vsock/af_vsock.c
>>+++ b/net/vmw_vsock/af_vsock.c
>>@@ -1389,6 +1389,28 @@ static int vsock_do_ioctl(struct socket *sock, unsigned int cmd,
>>	vsk = vsock_sk(sk);
>>
>>	switch (cmd) {
>>+	case SIOCINQ: {
>>+		ssize_t n_bytes;
>>+
>>+		if (!vsk->transport || !vsk->transport->unread_bytes) {
>>+			ret = -EOPNOTSUPP;
>>+			break;
>>+		}
>>+
>>+		if (sock_type_connectible(sk->sk_type) &&
>>+		    sk->sk_state == TCP_LISTEN) {
>>+			ret = -EINVAL;
>>+			break;
>>+		}
>>+
>>+		n_bytes = vsk->transport->unread_bytes(vsk);
>>+		if (n_bytes < 0) {
>>+			ret = n_bytes;
>>+			break;
>>+		}
>>+		ret = put_user(n_bytes, arg);
>>+		break;
>>+	}
>>	case SIOCOUTQ: {
>>		ssize_t n_bytes;
>>
>>-- 
>>2.34.1
>>
>
>Reviewed-by: Luigi Leonardi <leonardi@...hat.com>

Stefano is totally right, reusing `virtio_transport_unread_bytes` is a 
good idea.

nit: commit message should use 'imperative' language [1]. "This patch 
adds" should be avoided.

Sorry for the confusion.

Thanks,
Luigi

[1]https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes