netdev - Re: [RFC PATCH v6 16/22] vhost/vsock: SEQPACKET feature bit support

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Date:   Mon, 15 Mar 2021 12:28:30 +0100
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>,
        Colin Ian King <colin.king@...onical.com>,
        Norbert Slusarek <nslusarek@....net>,
        Andra Paraschiv <andraprs@...zon.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, stsp2@...dex.ru, oxffffaa@...il.com
Subject: Re: [RFC PATCH v6 16/22] vhost/vsock: SEQPACKET feature bit support

On Sun, Mar 07, 2021 at 09:03:41PM +0300, Arseny Krasnov wrote:
>This adds handling of SEQPACKET bit: if guest sets features with
>this bit cleared, then SOCK_SEQPACKET support will be disabled.
>
>Signed-off-by: Arseny Krasnov <arseny.krasnov@...persky.com>
>---
> drivers/vhost/vsock.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)

I think is better to move this patch after we set the seqpackets ops,
so we are really able to handle SEQPACKET traffic.

>
>diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
>index 5e78fb719602..3b0a50e6de12 100644
>--- a/drivers/vhost/vsock.c
>+++ b/drivers/vhost/vsock.c
>@@ -31,7 +31,8 @@
>
> enum {
> 	VHOST_VSOCK_FEATURES = VHOST_FEATURES |
>-			       (1ULL << VIRTIO_F_ACCESS_PLATFORM)
>+			       (1ULL << VIRTIO_F_ACCESS_PLATFORM) |
>+			       (1ULL << VIRTIO_VSOCK_F_SEQPACKET)
> };
>
> enum {
>@@ -785,6 +786,9 @@ static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
> 			goto err;
> 	}
>
>+	if (features & (1ULL << VIRTIO_VSOCK_F_SEQPACKET))
>+		vhost_transport.seqpacket_allow = true;
>+
> 	for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
> 		vq = &vsock->vqs[i];
> 		mutex_lock(&vq->mutex);
>-- 
>2.25.1
>