netdev - Re: [PATCH v4 2/4] vhost-vsock: add pkt cancel capability

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Date:   Tue, 13 Dec 2016 10:04:28 +0000
From:   "Jorgen S. Hansen" <jhansen@...are.com>
To:     Peng Tao <bergwolf@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        Stefan Hajnoczi <stefanha@...hat.com>
Subject: Re: [PATCH v4 2/4] vhost-vsock: add pkt cancel capability


> On Dec 12, 2016, at 1:21 PM, Peng Tao <bergwolf@...il.com> wrote:
> 
> To allow canceling all packets of a connection.
> 
> Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>
> Signed-off-by: Peng Tao <bergwolf@...il.com>
> ---
> drivers/vhost/vsock.c  | 41 +++++++++++++++++++++++++++++++++++++++++
> include/net/af_vsock.h |  3 +++
> 2 files changed, 44 insertions(+)
> 
> diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
> index a504e2e0..fef8808 100644
> --- a/drivers/vhost/vsock.c
> +++ b/drivers/vhost/vsock.c
> @@ -218,6 +218,46 @@ 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;
> +	int cnt = 0;
> +	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->cancel_token != vsk)
> +			continue;
> +		list_move(&pkt->list, &freeme);
> +	}
> +	spin_unlock_bh(&vsock->send_pkt_list_lock);
> +
> +	list_for_each_entry_safe(pkt, n, &freeme, list) {
> +		if (pkt->reply)
> +			cnt++;
> +		list_del(&pkt->list);
> +		virtio_transport_free_pkt(pkt);
> +	}
> +
> +	if (cnt) {
> +		struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX];
> +		int new_cnt;
> +
> +		new_cnt = atomic_sub_return(cnt, &vsock->queued_replies);
> +		if (new_cnt + cnt >= tx_vq->num && new_cnt < tx_vq->num)
> +			vhost_poll_queue(&tx_vq->poll);
> +	}
> +
> +	return 0;
> +}
> +
> static struct virtio_vsock_pkt *
> vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq,
> 		      unsigned int out, unsigned int in)
> @@ -664,6 +704,7 @@ static struct virtio_transport vhost_transport = {
> 		.release                  = virtio_transport_release,
> 		.connect                  = virtio_transport_connect,
> 		.shutdown                 = virtio_transport_shutdown,
> +		.cancel_pkt               = vhost_transport_cancel_pkt,
> 
> 		.dgram_enqueue            = virtio_transport_dgram_enqueue,
> 		.dgram_dequeue            = virtio_transport_dgram_dequeue,
> diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
> index f275896..f32ed9a 100644
> --- a/include/net/af_vsock.h
> +++ b/include/net/af_vsock.h
> @@ -100,6 +100,9 @@ struct vsock_transport {
> 	void (*destruct)(struct vsock_sock *);
> 	void (*release)(struct vsock_sock *);
> 
> +	/* Cancel all pending packets sent on vsock. */
> +	int (*cancel_pkt)(struct vsock_sock *vsk);
> +
> 	/* Connections. */
> 	int (*connect)(struct vsock_sock *);
> 
> -- 
> 2.7.4
> 

Reviewed-by: Jorgen Hansen <jhansen@...are.com>