netdev - Re: [PATCH net-next 2/2] flow_dissector: add tipc support

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Date:	Tue, 27 Jan 2015 13:08:52 +0100
From:	Erik Hugne <erik.hugne@...csson.com>
To:	David Miller <davem@...emloft.net>
CC:	<eric.dumazet@...il.com>, <richard.alpe@...csson.com>,
	<netdev@...r.kernel.org>, <jon.maloy@...csson.com>,
	<ying.xue@...driver.com>, <tipc-discussion@...ts.sourceforge.net>
Subject: Re: [PATCH net-next 2/2] flow_dissector: add tipc support

On Mon, Jan 26, 2015 at 04:57:49PM -0800, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Thu, 22 Jan 2015 09:29:11 -0800
> 
> > On Thu, 2015-01-22 at 17:10 +0100, erik.hugne@...csson.com wrote:
> >> From: Erik Hugne <erik.hugne@...csson.com>
> >> 
> >> The flows are hashed on the sending node address, which allows us
> >> to spread out the TIPC link processing to RPS enabled cores. There
> >> is no point to include the destination address in the hash as that
> >> will always be the same for all inbound links. We have experimented
> >> with a 3-tuple hash over [srcnode, sport, dport], but this showed to
> >> give slightly lower performance because of increased lock contention
> >> when the same link was handled by multiple cores.
> >> 
> >> Signed-off-by: Ying Xue <ying.xue@...driver.com>
> >> Signed-off-by: Erik Hugne <erik.hugne@...csson.com>
> >> Reviewed-by: Jon Maloy <jon.maloy@...csson.com>
> >> ---
> >>  net/core/flow_dissector.c | 14 ++++++++++++++
> >>  1 file changed, 14 insertions(+)
> >> 
> >> diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
> >> index 4508493..beb83d1 100644
> >> --- a/net/core/flow_dissector.c
> >> +++ b/net/core/flow_dissector.c
> >> @@ -178,6 +178,20 @@ ipv6:
> >>  			return false;
> >>  		}
> >>  	}
> >> +	case htons(ETH_P_TIPC): {
> >> +		struct {
> >> +			__be32 pre[3];
> >> +			__be32 srcnode;
> >> +		} *hdr, _hdr;
> > 
> > Is this header defined somewhere in an include file ?
> > 
> > This looks a bit ugly to locally define the format...
> 
> I'd like this situation improved but I plan to apply this as-is for
> now.

About time we do something about this.. I'll post a patch with proper header
definitions soon.

//E

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