netdev - Re: [PATCH v2 4/4] vsock: cancel packets when failing to connect

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Date:   Thu, 8 Dec 2016 09:24:46 +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,
        Jorgen Hansen <jhansen@...are.com>
Subject: Re: [PATCH v2 4/4] vsock: cancel packets when failing to connect

On Wed, Dec 07, 2016 at 11:14:12PM +0800, Peng Tao wrote:
> Otherwise we'll leave the packets queued until releasing vsock device.
> E.g., if guest is slow to start up, resulting ETIMEDOUT on connect, guest
> will get the connect requests from failed host sockets.
> 
> Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>
> Signed-off-by: Peng Tao <bergwolf@...il.com>
> ---
>  include/linux/virtio_vsock.h            | 7 +++++++
>  net/vmw_vsock/af_vsock.c                | 7 +++++++
>  net/vmw_vsock/virtio_transport_common.c | 7 -------
>  3 files changed, 14 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h
> index b92e88d..ff6850a 100644
> --- a/include/linux/virtio_vsock.h
> +++ b/include/linux/virtio_vsock.h
> @@ -156,4 +156,11 @@ void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vs
>  u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted);
>  void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit);
>  
> +static inline const struct virtio_transport *virtio_transport_get_ops(void)
> +{
> +	const struct vsock_transport *t = vsock_core_get_transport();
> +
> +	return container_of(t, struct virtio_transport, transport);
> +}
> +
>  #endif /* _LINUX_VIRTIO_VSOCK_H */
> diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
> index 8a398b3..ebb50d6 100644
> --- a/net/vmw_vsock/af_vsock.c
> +++ b/net/vmw_vsock/af_vsock.c
> @@ -104,6 +104,7 @@
>  #include <linux/unistd.h>
>  #include <linux/wait.h>
>  #include <linux/workqueue.h>
> +#include <linux/virtio_vsock.h>
>  #include <net/sock.h>
>  #include <net/af_vsock.h>
>  
> @@ -1105,6 +1106,7 @@ static void vsock_connect_timeout(struct work_struct *work)
>  {
>  	struct sock *sk;
>  	struct vsock_sock *vsk;
> +	int cancel = 0;
>  
>  	vsk = container_of(work, struct vsock_sock, dwork.work);
>  	sk = sk_vsock(vsk);
> @@ -1115,8 +1117,11 @@ static void vsock_connect_timeout(struct work_struct *work)
>  		sk->sk_state = SS_UNCONNECTED;
>  		sk->sk_err = ETIMEDOUT;
>  		sk->sk_error_report(sk);
> +		cancel = 1;
>  	}
>  	release_sock(sk);
> +	if (cancel)
> +		virtio_transport_get_ops()->cancel_pkt(vsk);

This doesn't work with the VMCI transport.  Remember af_vsock.c is
common code shared by all transports.

You need to add a struct vsock_transport->cancel_pkt() callback instead
os a struct virtio_transport->cancel_pkt() callback.  And you need to
handle the case where cancel_pkt == NULL if you don't implement it for
VMCI.

>  
>  	sock_put(sk);
>  }
> @@ -1223,11 +1228,13 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr,
>  			err = sock_intr_errno(timeout);
>  			sk->sk_state = SS_UNCONNECTED;
>  			sock->state = SS_UNCONNECTED;
> +			virtio_transport_get_ops()->cancel_pkt(vsk);
>  			goto out_wait;
>  		} else if (timeout == 0) {
>  			err = -ETIMEDOUT;
>  			sk->sk_state = SS_UNCONNECTED;
>  			sock->state = SS_UNCONNECTED;
> +			virtio_transport_get_ops()->cancel_pkt(vsk);
>  			goto out_wait;
>  		}
>  
> diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
> index cc1eeb5..72c5dff 100644
> --- a/net/vmw_vsock/virtio_transport_common.c
> +++ b/net/vmw_vsock/virtio_transport_common.c
> @@ -25,13 +25,6 @@
>  /* How long to wait for graceful shutdown of a connection */
>  #define VSOCK_CLOSE_TIMEOUT (8 * HZ)
>  
> -static const struct virtio_transport *virtio_transport_get_ops(void)
> -{
> -	const struct vsock_transport *t = vsock_core_get_transport();
> -
> -	return container_of(t, struct virtio_transport, transport);
> -}
> -
>  struct virtio_vsock_pkt *
>  virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info,
>  			   size_t len,
> -- 
> 2.7.4
> 
> --
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