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: <5482B44F.2050509@cumulusnetworks.com>
Date:	Fri, 05 Dec 2014 23:46:23 -0800
From:	Roopa Prabhu <roopa@...ulusnetworks.com>
To:	Thomas Graf <tgraf@...g.ch>
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 12/5/14, 2:43 PM, Thomas Graf wrote:
> 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.
I mentioned it as an alternative because it was there in my RFC patch. 
There is no code for it yet.
And I will get rid of the comment in v2.
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