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 09:44:26 +0000
From:	Shahed Shaikh <shahed.shaikh@...gic.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
CC:	Or Gerlitz <or.gerlitz@...il.com>,
	Joseph Gasparakis <joseph.gasparakis@...el.com>,
	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: Stephen Hemminger [mailto:stephen@...workplumber.org]
> Sent: Tuesday, March 11, 2014 8:58 PM
> To: Shahed Shaikh
> Cc: Or Gerlitz; 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
> 
...
> 
> Is it possible to do "lazy bind" to port, and set up offload when the first
> VXLAN is created? For most user's they will use one port and multiplex by
> VNI. But there maybe migration scenario's with multiple ports.
> 
Hi Stephen,

If I understand you comment correctly,  does this mean, driver should set up offload only for first N udp ports (here N=1 in case of qlcnic) used by VXLAN driver through vxlan_get_rx_port() -> ndo_add_vxlan_port() and discard subsequent ndo_add_vxlan_port() notification for N+ udp ports?
I see similar implementation in  i40e driver (N = 16).

Thanks,
Shahed

> The kernel made unfortunate choice of non-standard port, and has to stick
> with that. The ip command tries to nudge users to use the correct IANA port,
> therefore correct offload should wait until the first tunnel is created.
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