netdev - RE: [PATCH net-next 1/5] vxlan: Make VXLAN default UDP port number available for others

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Date:	Wed, 12 Mar 2014 10:20:14 +0000
From:	Shahed Shaikh <shahed.shaikh@...gic.com>
To:	Joseph Gasparakis <joseph.gasparakis@...el.com>,
	Or Gerlitz <or.gerlitz@...il.com>
CC:	John Fastabend <john.r.fastabend@...el.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	"Dept-HSG Linux NIC Dev" <Dept-HSGLinuxNICDev@...gic.com>
Subject: RE: [PATCH net-next 1/5] vxlan: Make VXLAN default UDP port number
 available for others

> -----Original Message-----
> From: Joseph Gasparakis [mailto:joseph.gasparakis@...el.com]
> Sent: Tuesday, March 11, 2014 10:59 PM
> To: Or Gerlitz
> Cc: Shahed Shaikh; Joseph Gasparakis; John Fastabend; David Miller; netdev;
> Dept-HSG Linux NIC Dev
> Subject: Re: [PATCH net-next 1/5] vxlan: Make VXLAN default UDP port
> number available for others
> 
> 
> 
...
> 
> For the sake of simplicity: if you have say two VXLANs listening on two
> different UDP ports, and a single port NIC that can only offload traffic from
> one UDP port, how would you know which VXLAN is more useful to offload?
> There might be traffic from the one port (and in this case it might be the
> default one or not) or you might have traffic from both.
> The fact is that you have a hw limitation, and you need something to help
> you predict what which VXLAN you are going to have traffic from which is not
> trivial at all.
> Therefore even having a way to use the routing tables wouldn't help I think.
> 
> In other words, IMHO the best option for running a NIC that can offload X
> UDP ports, is to use up to X UDP ports. Anything else, requres guessing that
> might not be accurate and hence can make things worse instead of better.

Makes sense. Thanks for your feedback Joseph.

Thanks,
Shahed
> 
> >
> > > Like Stephen suggested, exporting udp port variable of vxlan driver will
> be more suitable approach.
> >
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