netdev - Re: [PATCH net-next 2/3] tipc: do not report -EHOSTUNREACH for failed local delivery

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Date:	Wed, 18 Mar 2015 17:41:47 +0800
From:	Ying Xue <ying.xue@...driver.com>
To:	<erik.hugne@...csson.com>, <richard.alpe@...csson.com>,
	<jon.maloy@...csson.com>, <netdev@...r.kernel.org>
CC:	<tipc-discussion@...ts.sourceforge.net>
Subject: Re: [PATCH net-next 2/3] tipc: do not report -EHOSTUNREACH for failed
 local delivery

On 03/18/2015 05:17 PM, erik.hugne@...csson.com wrote:
> From: Erik Hugne <erik.hugne@...csson.com>
> 
> Since commit 1186adf7df04 ("tipc: simplify message forwarding and
> rejection in socket layer") -EHOSTUNREACH is propagated back to
> the sending process if we fail to deliver the message to another
> socket local to the node.
> This is wrong, host unreachable should only be reported when the
> destination port/name does not exist in the cluster, and that
> check is always done before sending the message. Also, this
> introduces inconsistent sendmsg() behavior for local/remote
> destinations. Errors occurring on the receiving side should not
> trickle up to the sender. If message delivery fails TIPC should
> either discard the packet or reject it back to the sender based
> on the destination droppable option.
> 
> Signed-off-by: Erik Hugne <erik.hugne@...csson.com>

Acked-by: Ying Xue <ying.xue@...driver.com>

> ---
>  net/tipc/link.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/net/tipc/link.c b/net/tipc/link.c
> index bc49120..8c98c4d 100644
> --- a/net/tipc/link.c
> +++ b/net/tipc/link.c
> @@ -845,8 +845,10 @@ int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode,
>  	if (link)
>  		return rc;
>  
> -	if (likely(in_own_node(net, dnode)))
> -		return tipc_sk_rcv(net, list);
> +	if (likely(in_own_node(net, dnode))) {
> +		tipc_sk_rcv(net, list);
> +		return 0;
> +	}
>  
>  	__skb_queue_purge(list);
>  	return rc;
> 

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