netdev - Re: [PATCH 1/3] netdev: introduce new NETIF_F_HW_SWITCH_OFFLOAD feature flag for switch device offloads

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Message-ID: <20141205224320.GA22992@casper.infradead.org>
Date:	Fri, 5 Dec 2014 22:43:20 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	roopa@...ulusnetworks.com
Cc:	jiri@...nulli.us, sfeldma@...il.com, jhs@...atatu.com,
	bcrl@...ck.org, john.fastabend@...il.com,
	stephen@...workplumber.org, linville@...driver.com,
	nhorman@...driver.com, nicolas.dichtel@...nd.com,
	vyasevic@...hat.com, f.fainelli@...il.com, buytenh@...tstofly.org,
	aviadr@...lanox.com, netdev@...r.kernel.org, davem@...emloft.net,
	shm@...ulusnetworks.com, gospo@...ulusnetworks.com
Subject: Re: [PATCH 1/3] netdev: introduce new NETIF_F_HW_SWITCH_OFFLOAD
 feature flag for switch device offloads

On 12/04/14 at 06:26pm, roopa@...ulusnetworks.com wrote:
> From: Roopa Prabhu <roopa@...ulusnetworks.com>
> 
> This is a generic high level feature flag for all switch asic features today.
> 
> switch drivers set this flag on switch ports. Logical devices like
> bridge, bonds, vxlans can inherit this flag from their slaves/ports.
> 
> I had to use SWITCH in the name to avoid ambiguity with other feature
> flags. But, since i have been harping about not calling it 'switch',
> I am welcome to any suggestions :)
> 
> An alternative to using a feature flag is to use a IFF_HW_OFFLOAD
> in net_device_flags.

What does this flag indicate specifically? What driver would
implement ndo_bridge_setlink() but not set this flag?

I think it should be clearly documented when this flag is to bet set.
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