netdev - Re: [net-next PATCH 3/4] net: sched: cls_u32 add bit to specify software only rules

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Date:	Wed, 24 Feb 2016 20:09:46 -0800
From:	John Fastabend <john.fastabend@...il.com>
To:	Jiri Benc <jbenc@...hat.com>
CC:	Jiri Pirko <jiri@...nulli.us>, "Amir Vadai\"" <amir@...ai.me>,
	daniel@...earbox.net, netdev@...r.kernel.org,
	alexei.starovoitov@...il.com, davem@...emloft.net, jhs@...atatu.com
Subject: Re: [net-next PATCH 3/4] net: sched: cls_u32 add bit to specify software
 only rules

On 16-02-24 01:29 AM, Jiri Benc wrote:
> On Wed, 24 Feb 2016 00:55:55 -0800, John Fastabend wrote:
>> The flags however likely stays with with TCA_U32_FLAGS until there is
>> some better way to group common attributes in 'tc' framework.
> 
> That's pretty bad, as this is uAPI and will need to be supported
> forever. And having a different attribute in every filter won't ease
> things for user space tools. I'd say we need the "better way" to be
> added before this patchset.
> 
>  Jiri
> 

The 'tc' semantics seem to support this "pretty bad" API design
with many of the fields already duplicated. I suppose we could
put the flags at the same level as the TCA_* attributes but this
also doesn't seem right to me as it isn't actually handled until
we get into the TCA_#CLASSIFIER#_* set of attributes.

.John