linux-kernel - Re: [PATCH v2 net-next] net: bridge: change return type of br_handle_ingress_vlan

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Message-ID: <d7931059-4841-a39f-4272-0053d6b61bac@nvidia.com>
Date:   Mon, 23 Aug 2021 13:00:42 +0300
From:   Nikolay Aleksandrov <nikolay@...dia.com>
To:     Kangmin Park <l4stpr0gr4m@...il.com>,
        Roopa Prabhu <roopa@...dia.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next] net: bridge: change return type of
 br_handle_ingress_vlan_tunnel

On 23/08/2021 12:56, Kangmin Park wrote:
> br_handle_ingress_vlan_tunnel() is only referenced in
> br_handle_frame(). If br_handle_ingress_vlan_tunnel() is called and
> return non-zero value, goto drop in br_handle_frame().
> 
> But, br_handle_ingress_vlan_tunnel() always return 0. So, the
> routines that check the return value and goto drop has no meaning.
> 
> Therefore, change return type of br_handle_ingress_vlan_tunnel() to
> void and remove if statement of br_handle_frame().
> 
> Signed-off-by: Kangmin Park <l4stpr0gr4m@...il.com>
> ---
> v2:
>  - cleanup instead of modifying ingress function
>  - change prototype of ingress function
>  - cleanup br_handle_frame function
>  - change commit message accordingly
> 
>  net/bridge/br_input.c          |  7 ++-----
>  net/bridge/br_private_tunnel.h |  6 +++---
>  net/bridge/br_vlan_tunnel.c    | 14 +++++++-------
>  3 files changed, 12 insertions(+), 15 deletions(-)
> 
[snip]
> diff --git a/net/bridge/br_vlan_tunnel.c b/net/bridge/br_vlan_tunnel.c
> index 01017448ebde..7d42b2a5be80 100644
> --- a/net/bridge/br_vlan_tunnel.c
> +++ b/net/bridge/br_vlan_tunnel.c
> @@ -158,30 +158,30 @@ void vlan_tunnel_deinit(struct net_bridge_vlan_group *vg)
>  	rhashtable_destroy(&vg->tunnel_hash);
>  }
>  
> -int br_handle_ingress_vlan_tunnel(struct sk_buff *skb,
> -				  struct net_bridge_port *p,
> -				  struct net_bridge_vlan_group *vg)
> +void br_handle_ingress_vlan_tunnel(struct sk_buff *skb,
> +				   struct net_bridge_port *p,
> +				   struct net_bridge_vlan_group *vg)
>  {
>  	struct ip_tunnel_info *tinfo = skb_tunnel_info(skb);
>  	struct net_bridge_vlan *vlan;
>  
>  	if (!vg || !tinfo)
> -		return 0;
> +		return;
>  
>  	/* if already tagged, ignore */
>  	if (skb_vlan_tagged(skb))
> -		return 0;
> +		return;
>  
>  	/* lookup vid, given tunnel id */
>  	vlan = br_vlan_tunnel_lookup(&vg->tunnel_hash, tinfo->key.tun_id);
>  	if (!vlan)
> -		return 0;
> +		return;
>  
>  	skb_dst_drop(skb);
>  
>  	__vlan_hwaccel_put_tag(skb, p->br->vlan_proto, vlan->vid);
>  
> -	return 0;
> +	return;

Please drop this unnecessary return statement at the end of the void function.

>  }
>  
>  int br_handle_egress_vlan_tunnel(struct sk_buff *skb,
>