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Date:   Mon, 8 Aug 2022 12:33:51 +0200
From:   Stefano Garzarella <sgarzare@redhat.com>
To:     Arseniy Krasnov <AVKrasnov@sberdevices.ru>
Cc:     "David S. Miller" <davem@davemloft.net>,
        "edumazet@google.com" <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        "kys@microsoft.com" <kys@microsoft.com>,
        "haiyangz@microsoft.com" <haiyangz@microsoft.com>,
        "sthemmin@microsoft.com" <sthemmin@microsoft.com>,
        "wei.liu@kernel.org" <wei.liu@kernel.org>,
        Dexuan Cui <decui@microsoft.com>,
        Stefan Hajnoczi <stefanha@redhat.com>,
        Bryan Tan <bryantan@vmware.com>,
        Vishnu Dasa <vdasa@vmware.com>,
        VMware PV-Drivers Reviewers <pv-drivers@vmware.com>,
        Krasnov Arseniy <oxffffaa@gmail.com>,
        "virtualization@lists.linux-foundation.org" 
        <virtualization@lists.linux-foundation.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        kernel <kernel@sberdevices.ru>
Subject: Re: [RFC PATCH v3 3/9] virtio/vsock: use 'target' in notify_poll_in
 callback
Message-ID: <20220808103351.gebdfctorobvbrow@sgarzare-redhat>
References: <2ac35e2c-26a8-6f6d-2236-c4692600db9e@sberdevices.ru>
 <a6844149-6ffc-09a6-b858-f24a27264c83@sberdevices.ru>
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On Wed, Aug 03, 2022 at 01:55:36PM +0000, Arseniy Krasnov wrote:
>This callback controls setting of POLLIN,POLLRDNORM output bits of poll()
>syscall,but in some cases,it is incorrectly to set it, when socket has
>at least 1 bytes of available data. Use 'target' which is already exists
>and equal to sk_rcvlowat in this case.

Little suggestion:
We should update the commit description, since so far 'target' is not 
equal to sk_rcvlowat.

With that fixed (and adding some spaces after the commas):

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

>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
>---
> net/vmw_vsock/virtio_transport_common.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
>diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
>index ec2c2afbf0d0..8f6356ebcdd1 100644
>--- a/net/vmw_vsock/virtio_transport_common.c
>+++ b/net/vmw_vsock/virtio_transport_common.c
>@@ -634,10 +634,7 @@ virtio_transport_notify_poll_in(struct vsock_sock *vsk,
> 				size_t target,
> 				bool *data_ready_now)
> {
>-	if (vsock_stream_has_data(vsk))
>-		*data_ready_now = true;
>-	else
>-		*data_ready_now = false;
>+	*data_ready_now = vsock_stream_has_data(vsk) >= target;
>
> 	return 0;
> }
>-- 
>2.25.1