linux-kernel - Re: [RFC PATCH v1 1/7] virtio/vsock: add 'VIRTIO_VSOCK_SEQ

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Message-ID: <20210806071857.h4zneiblcf5tathq@steredhat>
Date:   Fri, 6 Aug 2021 09:18:57 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseny Krasnov <arseny.krasnov@...persky.com>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jorgen Hansen <jhansen@...are.com>,
        Andra Paraschiv <andraprs@...zon.com>,
        Norbert Slusarek <nslusarek@....net>,
        Colin Ian King <colin.king@...onical.com>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        oxffffaa@...il.com
Subject: Re: [RFC PATCH v1 1/7] virtio/vsock: add 'VIRTIO_VSOCK_SEQ_EOM' bit

On Mon, Jul 26, 2021 at 07:33:04PM +0300, Arseny Krasnov wrote:
>This bit is used to mark end of messages('EOM' - end of message), while
>'VIRIO_VSOCK_SEQ_EOR' is used to pass MSG_EOR.
>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@...persky.com>
>---
> include/uapi/linux/virtio_vsock.h | 1 +
> 1 file changed, 1 insertion(+)
>
>diff --git a/include/uapi/linux/virtio_vsock.h b/include/uapi/linux/virtio_vsock.h
>index 3dd3555b2740..1de3211a2988 100644
>--- a/include/uapi/linux/virtio_vsock.h
>+++ b/include/uapi/linux/virtio_vsock.h
>@@ -98,6 +98,7 @@ enum virtio_vsock_shutdown {
> /* VIRTIO_VSOCK_OP_RW flags values */
> enum virtio_vsock_rw {
> 	VIRTIO_VSOCK_SEQ_EOR = 1,
>+	VIRTIO_VSOCK_SEQ_EOM = 2,
> };

Already said, but I'll repeat it for completeness.

It's better to rename the flag 1 and use it in the same way we did 
before, so it's backward compatible.

Obviously we have to update the specifications too, explaining the 
difference between the two :-)

Thanks,
Stefano