Re: [PATCH net-next] net: Facility to report route quality of connected sockets

[David Miller <davem@davemloft.net>]

From: Tom Herbert <tom@herbertland.com>
Date: Wed, 24 Feb 2016 10:02:52 -0800

> This patch add the SO_CNX_ADVICE socket option (setsockopt only). The
> purpose is to allow an application to give feedback to the kernel about
> the quality of the network path for a connected socket. The value
> argument indicates the type of quality report. For this initial patch
> the only supported advice is a value of 1 which indicates "bad path,
> please reroute"-- the action taken by the kernel is to call
> dst_negative_advice which will attempt to choose a different ECMP route,
> reset the TX hash for flow label and UDP source port in encapsulation,
> etc.
> 
> This facility should be useful for connected UDP sockets where only the
> application can provide any feedback about path quality. It could also
> be useful for TCP applications that have additional knowledge about the
> path outside of the normal TCP control loop.
> 
> Signed-off-by: Tom Herbert <tom@herbertland.com>

This looks fine, applied, thanks Tom.