netdev - Re: [RFC net-next 6/9] net/cls_flower: Introduce hardware offloading

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Date:	Mon, 01 Feb 2016 01:47:24 -0800
From:	John Fastabend <john.fastabend@...il.com>
To:	Amir Vadai <amir@...ai.me>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	John Fastabend <john.r.fastabend@...el.com>
CC:	Or Gerlitz <ogerlitz@...lanox.com>,
	Hadar Har-Zion <hadarh@...lanox.com>,
	Jiri Pirko <jiri@...lanox.com>,
	Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [RFC net-next 6/9] net/cls_flower: Introduce hardware offloading

On 16-02-01 01:31 AM, John Fastabend wrote:
> On 16-02-01 12:34 AM, Amir Vadai wrote:
>> During initialization, tcf_exts_offload_init() is called to initialize
>> the list of actions description. later on, the classifier description
>> is prepared and sent to the switchdev using switchdev_port_flow_add().
>>
>> When offloaded, fl_classify() is a NOP - already done in hardware.
>>
>> Signed-off-by: Amir Vadai <amir@...ai.me>
>> ---
> 
> You need to account for where the classifier is being loaded
> by passing the handle as I did in my patch set. Otherwise you may
> be offloading on egress/ingress or even some qdisc multiple layers
> down in the hierarchy.
> 
> .John
> 

Hi Amir,

I've read through the patches take a look at my set and see if you
can add this as another TC_SETUP_* command namely TC_SETUP_FLOWER. The
switchdev bits could be handled the same way as fdb_add and other ndo
ops are handled today in rocker. I don't think your set of patches
would have to change much to merge them with my set. I'll take a stab
at it tomorrow and send out a v2. I think this would work and then NIC
can implement just the tc_setup ndo and your switchdev patches remain
unchanged.

Thanks,
John