netdev - Re: [PATCH 2/4] vhost-vsock: add pkt cancel capability

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Date:   Wed, 7 Dec 2016 13:23:36 +0000
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     Peng Tao <bergwolf@...il.com>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/4] vhost-vsock: add pkt cancel capability

On Wed, Dec 07, 2016 at 06:00:19PM +0800, Peng Tao wrote:
> To allow canceling all packets of a connection.
> 
> Signed-off-by: Peng Tao <bergwolf@...il.com>
> ---
>  drivers/vhost/vsock.c        | 29 +++++++++++++++++++++++++++++
>  include/linux/virtio_vsock.h |  3 +++
>  2 files changed, 32 insertions(+)
> 
> diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
> index a504e2e0..0c23b55 100644
> --- a/drivers/vhost/vsock.c
> +++ b/drivers/vhost/vsock.c
> @@ -218,6 +218,34 @@ vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt)
>  	return len;
>  }
>  
> +static int
> +vhost_transport_cancel_pkt(struct vsock_sock *vsk)
> +{
> +	struct vhost_vsock *vsock;
> +	struct virtio_vsock_pkt *pkt, *n;
> +	LIST_HEAD(freeme);
> +
> +	/* Find the vhost_vsock according to guest context id  */
> +	vsock = vhost_vsock_get(vsk->remote_addr.svm_cid);
> +	if (!vsock)
> +		return -ENODEV;
> +
> +	spin_lock_bh(&vsock->send_pkt_list_lock);
> +	list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) {
> +		if (pkt->vsk != vsk)
> +			continue;
> +		list_move(&pkt->list, &freeme);
> +	}
> +	spin_unlock_bh(&vsock->send_pkt_list_lock);
> +
> +	list_for_each_entry_safe(pkt, n, &freeme, list) {
> +		list_del(&pkt->list);
> +		virtio_transport_free_pkt(pkt);
> +	}

Please handle queued_replies so we can resume rx if we fall below the
threshold again.

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