> On Dec 12, 2016, at 1:21 PM, Peng Tao <bergwolf@xxxxxxxxx> wrote:
>
> To allow canceling all packets of a connection.
>
> Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
> Signed-off-by: Peng Tao <bergwolf@xxxxxxxxx>
> ---
> 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@xxxxxxxxxx>
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