linux-kernel - [RFC PATCH v6 17/22] virtio/vsock: SEQPACKET feature bit support

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Date:   Sun, 7 Mar 2021 21:04:01 +0300
From:   Arseny Krasnov <arseny.krasnov@...persky.com>
To:     Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Arseny Krasnov <arseny.krasnov@...persky.com>,
        Jorgen Hansen <jhansen@...are.com>,
        Norbert Slusarek <nslusarek@....net>,
        Colin Ian King <colin.king@...onical.com>,
        Andra Paraschiv <andraprs@...zon.com>
CC:     <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: [RFC PATCH v6 17/22] virtio/vsock: SEQPACKET feature bit support

This adds handling of SEQPACKET bit: guest tries to negotiate it
with vhost.

Signed-off-by: Arseny Krasnov <arseny.krasnov@...persky.com>
---
 net/vmw_vsock/virtio_transport.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 2700a63ab095..41c5d0a31e08 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -612,6 +612,10 @@ static int virtio_vsock_probe(struct virtio_device *vdev)
 	rcu_assign_pointer(the_virtio_vsock, vsock);
 
 	mutex_unlock(&the_virtio_vsock_mutex);
+
+	if (vdev->features & (1ULL << VIRTIO_VSOCK_F_SEQPACKET))
+		virtio_transport.seqpacket_allow = true;
+
 	return 0;
 
 out:
@@ -695,6 +699,7 @@ static struct virtio_device_id id_table[] = {
 };
 
 static unsigned int features[] = {
+	VIRTIO_VSOCK_F_SEQPACKET
 };
 
 static struct virtio_driver virtio_vsock_driver = {
-- 
2.25.1