netdev - Re: [PATCH net] VSOCK: handle VIRTIO_VSOCK_OP_CREDIT

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Date:   Mon, 2 Aug 2021 20:34:56 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Harshavardhan Unnibhavi <harshanavkis@...il.com>
Cc:     stefanha@...hat.com, davem@...emloft.net, kuba@...nel.org,
        asias@...hat.com, mst@...hat.com, imbrenda@...ux.vnet.ibm.com,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] VSOCK: handle VIRTIO_VSOCK_OP_CREDIT_REQUEST

On Mon, Aug 02, 2021 at 07:35:06PM +0200, Harshavardhan Unnibhavi wrote:
>The original implementation of the virtio-vsock driver does not
>handle a VIRTIO_VSOCK_OP_CREDIT_REQUEST as required by the
>virtio-vsock specification. The vsock device emulated by
>vhost-vsock and the virtio-vsock driver never uses this request,
>which was probably why nobody noticed it. However, another
>implementation of the device may use this request type.
>
>Hence, this commit introduces a way to handle an explicit credit
>request by responding with a corresponding credit update as
>required by the virtio-vsock specification.
>
>Fixes: 06a8fc78367d ("VSOCK: Introduce virtio_vsock_common.ko")
>
>Signed-off-by: Harshavardhan Unnibhavi <harshanavkis@...il.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 169ba8b72a63..081e7ae93cb1 100644
>--- a/net/vmw_vsock/virtio_transport_common.c
>+++ b/net/vmw_vsock/virtio_transport_common.c
>@@ -1079,6 +1079,9 @@ virtio_transport_recv_connected(struct sock *sk,
> 		virtio_transport_recv_enqueue(vsk, pkt);
> 		sk->sk_data_ready(sk);
> 		return err;
>+	case VIRTIO_VSOCK_OP_CREDIT_REQUEST:
>+		virtio_transport_send_credit_update(vsk);
>+		break;
> 	case VIRTIO_VSOCK_OP_CREDIT_UPDATE:
> 		sk->sk_write_space(sk);
> 		break;
>-- 2.17.1
>

The patch LGTM, thanks for fixing this long-time issue!

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