netdev - Re: [PATCH net-next V3 3/3] net: Add GRO support for vxlan traffic

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Date:	Wed, 08 Jan 2014 14:11:41 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Or Gerlitz <ogerlitz@...lanox.com>
Cc:	hkchu@...gle.com, edumazet@...gle.com, herbert@...dor.apana.org.au,
	netdev@...r.kernel.org, davem@...emloft.net, yanb@...lanox.com,
	shlomop@...lanox.com
Subject: Re: [PATCH net-next V3 3/3] net: Add GRO support for vxlan traffic

On Wed, 2014-01-08 at 22:34 +0200, Or Gerlitz wrote:

> +
>  /* Notify netdevs that UDP port started listening */
> -static void vxlan_notify_add_rx_port(struct sock *sk)
> +static void vxlan_notify_add_rx_port(struct vxlan_sock *vs)
>  {
>  	struct net_device *dev;
> +	struct sock *sk = vs->sock->sk;
>  	struct net *net = sock_net(sk);
>  	sa_family_t sa_family = sk->sk_family;
>  	__be16 port = inet_sk(sk)->inet_sport;
> @@ -569,12 +671,16 @@ static void vxlan_notify_add_rx_port(struct sock *sk)
>  							    port);
>  	}
>  	rcu_read_unlock();
> +
> +	if (sa_family == AF_INET)
> +		call_rcu(&vs->rcu, vxlan_add_udp_offload);

Why waiting RCU grace period here ?

>  }
>  
>  /* Notify netdevs that UDP port is no more listening */
> -static void vxlan_notify_del_rx_port(struct sock *sk)
> +static void vxlan_notify_del_rx_port(struct vxlan_sock *vs)
>  {
>  	struct net_device *dev;
> +	struct sock *sk = vs->sock->sk;
>  	struct net *net = sock_net(sk);
>  	sa_family_t sa_family = sk->sk_family;
>  	__be16 port = inet_sk(sk)->inet_sport;
> @@ -586,6 +692,9 @@ static void vxlan_notify_del_rx_port(struct sock *sk)
>  							    port);
>  	}
>  	rcu_read_unlock();
> +
> +	if (sa_family == AF_INET)
> +		call_rcu(&vs->rcu, vxlan_del_udp_offload);
>  }

This looks buggy.

You need to :

1) remove the offload structure from list
2) Then wait rcu grace period, and finally free the memory



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