linux-kernel - Re: [RFC PATCH v2 2/3] vsock/vmci: convert VMCI error code to -ENOMEM

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Date:   Thu, 30 Mar 2023 10:19:00 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseniy Krasnov <avkrasnov@...rdevices.ru>,
        Vishnu Dasa <vdasa@...are.com>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>,
        Bryan Tan <bryantan@...are.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...rdevices.ru,
        oxffffaa@...il.com, pv-drivers@...are.com
Subject: Re: [RFC PATCH v2 2/3] vsock/vmci: convert VMCI error code to -ENOMEM

On Thu, Mar 30, 2023 at 10:07:36AM +0300, Arseniy Krasnov wrote:
>This adds conversion of VMCI specific error code to general -ENOMEM. It
>is needed, because af_vsock.c passes error value returned from transport
>to the user.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>---
> net/vmw_vsock/vmci_transport.c | 19 ++++++++++++++++---
> 1 file changed, 16 insertions(+), 3 deletions(-)
>
>diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
>index 36eb16a40745..45de3e75597f 100644
>--- a/net/vmw_vsock/vmci_transport.c
>+++ b/net/vmw_vsock/vmci_transport.c
>@@ -1831,10 +1831,17 @@ static ssize_t vmci_transport_stream_dequeue(
> 	size_t len,
> 	int flags)
> {
>+	int err;

Please, use the same type returned by the function.

>+
> 	if (flags & MSG_PEEK)
>-		return vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
>+		err = vmci_qpair_peekv(vmci_trans(vsk)->qpair, msg, len, 0);
> 	else
>-		return vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
>+		err = vmci_qpair_dequev(vmci_trans(vsk)->qpair, msg, len, 0);
>+
>+	if (err < 0)
>+		err = -ENOMEM;
>+
>+	return err;
> }
>
> static ssize_t vmci_transport_stream_enqueue(
>@@ -1842,7 +1849,13 @@ static ssize_t vmci_transport_stream_enqueue(
> 	struct msghdr *msg,
> 	size_t len)
> {
>-	return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
>+	int err;

Ditto.

>+
>+	err = vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
>+	if (err < 0)
>+		err = -ENOMEM;
>+
>+	return err;
> }

@Vishnu: should we backport the change for
vmci_transport_stream_enqueue() to stable branches?

In this case I would split this patch and I would send the
vmci_transport_stream_enqueue() change to the net branch including:

Fixes: c43170b7e157 ("vsock: return errors other than -ENOMEM to socket")

Thanks,
Stefano