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

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Message-Id: <20160225.220140.1022665279243146846.davem@davemloft.net>
Date:	Thu, 25 Feb 2016 22:01:40 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	tom@...bertland.com
Cc:	netdev@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH net-next] net: Facility to report route quality of
 connected sockets

From: Tom Herbert <tom@...bertland.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@...bertland.com>

This looks fine, applied, thanks Tom.