linux-kernel - [PATCH net 1/2] vsock/virtio: send a credit update when buffer size is changed

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Message-Id: <20191017124403.266242-2-sgarzare@redhat.com>
Date:   Thu, 17 Oct 2019 14:44:02 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     netdev@...r.kernel.org
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH net 1/2] vsock/virtio: send a credit update when buffer size is changed

When the user application set a new buffer size value, we should
update the remote peer about this change, since it uses this
information to calculate the credit available.

Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 net/vmw_vsock/virtio_transport_common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index a666ef8fc54e..db127a69f5c3 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -458,6 +458,9 @@ void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val)
 		vvs->buf_size_max = val;
 	vvs->buf_size = val;
 	vvs->buf_alloc = val;
+
+	virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM,
+					    NULL);
 }
 EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size);
 
-- 
2.21.0