linux-kernel - Re: [RFC PATCH v5 09/17] vsock: enable SOCK_SUPPORT

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Message-ID: <vaknax5rfvbb3ymylshak4cih2ddhsfhiq5dualh5frbedczmw@zduzizg2g6pa>
Date:   Thu, 6 Jul 2023 18:55:13 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseniy Krasnov <AVKrasnov@...rdevices.ru>
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>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.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
Subject: Re: [RFC PATCH v5 09/17] vsock: enable SOCK_SUPPORT_ZC bit

On Sat, Jul 01, 2023 at 09:39:39AM +0300, Arseniy Krasnov wrote:
>This bit is used by io_uring in case of zerocopy tx mode. io_uring code
>checks, that socket has this feature. This patch sets it in two places:
>1) For socket in 'connect()' call.
>2) For new socket which is returned by 'accept()' call.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>---
> net/vmw_vsock/af_vsock.c | 6 ++++++
> 1 file changed, 6 insertions(+)

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

>
>diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
>index 033006e1b5ad..da22ae0ef477 100644
>--- a/net/vmw_vsock/af_vsock.c
>+++ b/net/vmw_vsock/af_vsock.c
>@@ -1406,6 +1406,9 @@ static int vsock_connect(struct socket *sock, struct sockaddr *addr,
> 			goto out;
> 		}
>
>+		if (vsock_msgzerocopy_allow(transport))
>+			set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
>+
> 		err = vsock_auto_bind(vsk);
> 		if (err)
> 			goto out;
>@@ -1560,6 +1563,9 @@ static int vsock_accept(struct socket *sock, struct socket *newsock, int flags,
> 		} else {
> 			newsock->state = SS_CONNECTED;
> 			sock_graft(connected, newsock);
>+			if (vsock_msgzerocopy_allow(vconnected->transport))
>+				set_bit(SOCK_SUPPORT_ZC,
>+					&connected->sk_socket->flags);
> 		}
>
> 		release_sock(connected);
>-- 
>2.25.1
>