netdev - Re: [PATCH net v2] switchdev: don't abort hardware ipv4 fib offload on failure to program fib entry in hardware

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Message-ID: <CAE4R7bAE_qV2ZrbUYQeU9auythE_ZEmiSkigPm=0XZnS5v-gxQ@mail.gmail.com>
Date:	Sun, 17 May 2015 22:11:30 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	john fastabend <john.fastabend@...il.com>,
	Jiří Pírko <jiri@...nulli.us>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net v2] switchdev: don't abort hardware ipv4 fib offload
 on failure to program fib entry in hardware

On Sun, May 17, 2015 at 4:42 PM, Roopa Prabhu <roopa@...ulusnetworks.com> wrote:
> From: Roopa Prabhu <roopa@...ulusnetworks.com>
>
> This patch removes the calls to netdev_switch_fib_ipv4_abort when
> there is an error in programming fib entry in hardware.
>
> On most systems where you can offload routes to hardware,
> doing routing in software is not an option (the cpu limitations
> make routing impossible in software).
>
> I understand that this was added to keep the first fib offload support
> simple.
>
> As discussed in the RFC patch, available options:
> a) Fail fib entry add on hardware offload failure on switch devices, and
> return appropriate error to the user by default (this patch)
> b) make the behaviour in a) conditional on a global flag/sysctl (a per fib
> entry flag will not work because by default user/routing-daemons dont care
> if they are hardware offloaded)
> c) for users/routing-daemons interested in controlling hardware
> offload behaviour there is always the per fib entry flag RTNH_F_OFFLOAD
>
> Considering the characteristics of the systems that support fib offloads,
> this patch implements a). Also making a) the default will enable easier/faster
> migration of existing routing apps to switch devices.
>
> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>

Acked-by: Scott Feldman <sfeldma@...il.com>
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