netdev - Re: [PATCH net-next v3 0/7] switchdev: add IPv4 routing offload

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Message-Id: <20150305.000717.479876439702052068.davem@davemloft.net>
Date:	Thu, 05 Mar 2015 00:07:17 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	sfeldma@...il.com
Cc:	netdev@...r.kernel.org, jiri@...nulli.us, roopa@...ulusnetworks.com
Subject: Re: [PATCH net-next v3 0/7] switchdev: add IPv4 routing offload

From: Scott Feldman <sfeldma@...il.com>
Date: Wed, 4 Mar 2015 20:50:28 -0800

> I don't know what to do for v4.  Bummer, we got pretty close.  My only
> ideas right now involve more code to handling unwinding some routes
> from hw when related route fails to install to hw.

Scott:

1) route ADD

	driver has NULL ndo_op, do nothing, install sw route

	ndo_op SUCCESS, return 0, all is good and the caller sets the
	external bit

	ndo_op FAILURE, returns any error code, any and all external
	routes are removed with DEL ndo_op, all external bits are
	cleared

2) route DEL

	driver has NULL ndo_op, do nothing

	ndo_op SUCCESS, return 0, clear external bit

	ndo_op FAILURE, pass failure up the delete call stack
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