netdev - Re: [PATCH net-next v2 1/3] vsock: add support for SIOCOUTQ ioctl for all vsock socket types.

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Date: Wed, 8 May 2024 10:22:09 +0200
From: Stefano Garzarella <sgarzare@...hat.com>
To: Luigi Leonardi <luigi.leonardi@...look.com>
Cc: mst@...hat.com, xuanzhuo@...ux.alibaba.com, 
	virtualization@...ts.linux.dev, netdev@...r.kernel.org, kuba@...nel.org, stefanha@...hat.com, 
	davem@...emloft.net, pabeni@...hat.com, edumazet@...gle.com, kvm@...r.kernel.org, 
	jasowang@...hat.com, Daan De Meyer <daan.j.demeyer@...il.com>
Subject: Re: [PATCH net-next v2 1/3] vsock: add support for SIOCOUTQ ioctl
 for all vsock socket types.

On Mon, Apr 08, 2024 at 03:37:47PM GMT, Luigi Leonardi wrote:
>This add support for ioctl(s) for SOCK_STREAM SOCK_SEQPACKET and SOCK_DGRAM
>in AF_VSOCK.
>The only ioctl available is SIOCOUTQ/TIOCOUTQ, which returns the number
>of unsent bytes in the socket. This information is transport-specific
>and is delegated to them using a callback.
>
>Suggested-by: Daan De Meyer <daan.j.demeyer@...il.com>
>Signed-off-by: Luigi Leonardi <luigi.leonardi@...look.com>
>---
> include/net/af_vsock.h   |  3 +++
> net/vmw_vsock/af_vsock.c | 51 +++++++++++++++++++++++++++++++++++++---
> 2 files changed, 51 insertions(+), 3 deletions(-)
>
>diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
>index 535701efc1e5..7d67faa7bbdb 100644
>--- a/include/net/af_vsock.h
>+++ b/include/net/af_vsock.h
>@@ -169,6 +169,9 @@ struct vsock_transport {
> 	void (*notify_buffer_size)(struct vsock_sock *, u64 *);
> 	int (*notify_set_rcvlowat)(struct vsock_sock *vsk, int val);
>
>+	/* SIOCOUTQ ioctl */
>+	int (*unsent_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 54ba7316f808..fc108283409a 100644
>--- a/net/vmw_vsock/af_vsock.c
>+++ b/net/vmw_vsock/af_vsock.c
>@@ -112,6 +112,7 @@
> #include <net/sock.h>
> #include <net/af_vsock.h>
> #include <uapi/linux/vm_sockets.h>
>+#include <uapi/asm-generic/ioctls.h>
>
> static int __vsock_bind(struct sock *sk, struct sockaddr_vm *addr);
> static void vsock_sk_destruct(struct sock *sk);
>@@ -1292,6 +1293,50 @@ int vsock_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
> }
> EXPORT_SYMBOL_GPL(vsock_dgram_recvmsg);
>
>+static int vsock_do_ioctl(struct socket *sock, unsigned int cmd,
>+			  int __user *arg)
>+{
>+	struct sock *sk = sock->sk;
>+	struct vsock_sock *vsk;
>+	int retval;
>+
>+	vsk = vsock_sk(sk);
>+
>+	switch (cmd) {
>+	case SIOCOUTQ: {
>+		int n_bytes;
>+
>+		if (vsk->transport->unsent_bytes) {

Should we also check the `vsk->transport` is not null?

I also suggest an early return, or to have the shortest branch on top
for readability:

		if (!vsk->transport || !vsk->transport->unsent_bytes) {
			retval = -EOPNOTSUPP;
			break;
		}

Thanks,
Stefano

>+			if (sock_type_connectible(sk->sk_type) && sk->sk_state == TCP_LISTEN) {
>+				retval = -EINVAL;
>+				break;
>+			}
>+
>+			n_bytes = vsk->transport->unsent_bytes(vsk);
>+			if (n_bytes < 0) {
>+				retval = n_bytes;
>+				break;
>+			}
>+
>+			retval = put_user(n_bytes, arg);
>+		} else {
>+			retval = -EOPNOTSUPP;
>+		}
>+		break;
>+	}
>+	default:
>+		retval = -ENOIOCTLCMD;
>+	}
>+
>+	return retval;
>+}
>+
>+static int vsock_ioctl(struct socket *sock, unsigned int cmd,
>+		       unsigned long arg)
>+{
>+	return vsock_do_ioctl(sock, cmd, (int __user *)arg);
>+}
>+
> static const struct proto_ops vsock_dgram_ops = {
> 	.family = PF_VSOCK,
> 	.owner = THIS_MODULE,
>@@ -1302,7 +1347,7 @@ static const struct proto_ops vsock_dgram_ops = {
> 	.accept = sock_no_accept,
> 	.getname = vsock_getname,
> 	.poll = vsock_poll,
>-	.ioctl = sock_no_ioctl,
>+	.ioctl = vsock_ioctl,
> 	.listen = sock_no_listen,
> 	.shutdown = vsock_shutdown,
> 	.sendmsg = vsock_dgram_sendmsg,
>@@ -2286,7 +2331,7 @@ static const struct proto_ops vsock_stream_ops = {
> 	.accept = vsock_accept,
> 	.getname = vsock_getname,
> 	.poll = vsock_poll,
>-	.ioctl = sock_no_ioctl,
>+	.ioctl = vsock_ioctl,
> 	.listen = vsock_listen,
> 	.shutdown = vsock_shutdown,
> 	.setsockopt = vsock_connectible_setsockopt,
>@@ -2308,7 +2353,7 @@ static const struct proto_ops vsock_seqpacket_ops = {
> 	.accept = vsock_accept,
> 	.getname = vsock_getname,
> 	.poll = vsock_poll,
>-	.ioctl = sock_no_ioctl,
>+	.ioctl = vsock_ioctl,
> 	.listen = vsock_listen,
> 	.shutdown = vsock_shutdown,
> 	.setsockopt = vsock_connectible_setsockopt,
>-- 
>2.34.1
>