linux-kernel - Re: [RFC PATCH v1 03/12] vsock: check for MSG

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Date:   Thu, 16 Feb 2023 15:02:30 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseniy Krasnov <AVKrasnov@...rdevices.ru>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Krasnov Arseniy <oxffffaa@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>
Subject: Re: [RFC PATCH v1 03/12] vsock: check for MSG_ZEROCOPY support

On Mon, Feb 06, 2023 at 06:55:46AM +0000, Arseniy Krasnov wrote:
>This feature totally depends on transport, so if transport doesn't
>support it, return error.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>---
> include/net/af_vsock.h   | 2 ++
> net/vmw_vsock/af_vsock.c | 7 +++++++
> 2 files changed, 9 insertions(+)
>
>diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
>index 568a87c5e0d0..96d829004c81 100644
>--- a/include/net/af_vsock.h
>+++ b/include/net/af_vsock.h
>@@ -173,6 +173,8 @@ struct vsock_transport {
>
> 	/* Addressing. */
> 	u32 (*get_local_cid)(void);
>+

LGTM, just add comment here for a new section following what we did for
other callaback, e.g.:

         /* Zero-copy. */
>+	bool (*msgzerocopy_allow)(void);
> };
>
> /**** CORE ****/
>diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>index f752b30b71d6..fb0fcb390113 100644
>--- a/net/vmw_vsock/af_vsock.c
>+++ b/net/vmw_vsock/af_vsock.c
>@@ -1788,6 +1788,13 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg,
> 		goto out;
> 	}
>
>+	if (msg->msg_flags & MSG_ZEROCOPY &&
>+	    (!transport->msgzerocopy_allow ||
>+	     !transport->msgzerocopy_allow())) {
>+		err = -EOPNOTSUPP;
>+		goto out;
>+	}
>+
> 	/* Wait for room in the produce queue to enqueue our user's data. */
> 	timeout = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
>
>-- 
>2.25.1