netdev - Re: [PATCH net-next v3 1/3] vsock: add support for SIOCOUTQ ioctl for all vsock socket types.

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Date: Fri, 28 Jun 2024 11:09:09 +0200
From: Stefano Garzarella <sgarzare@...hat.com>
To: luigi.leonardi@...look.com
Cc: "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Stefan Hajnoczi <stefanha@...hat.com>, 
	"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
	Eugenio Pérez <eperezma@...hat.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	virtualization@...ts.linux.dev, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org, Daan De Meyer <daan.j.demeyer@...il.com>
Subject: Re: [PATCH net-next v3 1/3] vsock: add support for SIOCOUTQ ioctl
 for all vsock socket types.

nit: in theory in this patch we don't support it for any of the 
transports, so I wouldn't confuse and take that part out of the title.

WDYT with someting like:

     vsock: add support for SIOCOUTQ ioctl

On Wed, Jun 26, 2024 at 02:08:35PM GMT, Luigi Leonardi via B4 Relay 
wrote:
>From: Luigi Leonardi <luigi.leonardi@...look.com>
>
>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 | 60 +++++++++++++++++++++++++++++++++++++++++++++---
> 2 files changed, 60 insertions(+), 3 deletions(-)
>
>diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
>index 535701efc1e5..7b5375ae7827 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 */
>+	size_t (*unsent_bytes)(struct vsock_sock *vsk);

If you want to return also errors, maybe better returning ssize_t.
This should fix one of the error reported by kernel bots.

>+
> 	/* Shutdown. */
> 	int (*shutdown)(struct vsock_sock *, int);
>
>diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>index 4b040285aa78..d6140d73d122 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 +1293,59 @@ 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: {
>+		size_t n_bytes;
>+
>+		if (!vsk->transport || !vsk->transport->unsent_bytes) {
>+			retval = -EOPNOTSUPP;
>+			break;
>+		}
>+
>+		if (vsk->transport->unsent_bytes) {

This if is not necessary after the check we did earlier, right?

Removing it should fix the other issue reported by the bot.

>+			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);
>+		}
>+		break;
>+	}
>+	default:
>+		retval = -ENOIOCTLCMD;
>+	}
>+
>+	return retval;
>+}
>+
>+static int vsock_ioctl(struct socket *sock, unsigned int cmd,
>+		       unsigned long arg)
>+{
>+	int ret;
>+
>+	lock_sock(sock->sk);
>+	ret = vsock_do_ioctl(sock, cmd, (int __user *)arg);
>+	release_sock(sock->sk);
>+
>+	return ret;
>+}
>+
> static const struct proto_ops vsock_dgram_ops = {
> 	.family = PF_VSOCK,
> 	.owner = THIS_MODULE,
>@@ -1302,7 +1356,7 @@ 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 +2340,7 @@ 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 +2362,7 @@ 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,
>
>-- 
>2.45.2
>
>
>