netdev - Re: [patch net-next v2 0/9] net: sched: introduce chain templates support with offloading to mlxsw

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Date:   Thu, 28 Jun 2018 08:25:47 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jakub.kicinski@...ronome.com, simon.horman@...ronome.com,
        john.hurley@...ronome.com, dsahern@...il.com, mlxsw@...lanox.com
Subject: Re: [patch net-next v2 0/9] net: sched: introduce chain templates
 support with offloading to mlxsw

Thu, Jun 28, 2018 at 06:48:26AM CEST, davem@...emloft.net wrote:
>From: Jiri Pirko <jiri@...nulli.us>
>Date: Tue, 26 Jun 2018 09:59:51 +0200
>
>> For the TC clsact offload these days, some of HW drivers need
>> to hold a magic ball. The reason is, with the first inserted rule inside
>> HW they need to guess what fields will be used for the matching. If
>> later on this guess proves to be wrong and user adds a filter with a
>> different field to match, there's a problem. Mlxsw resolves it now with
>> couple of patterns. Those try to cover as many match fields as possible.
>> This aproach is far from optimal, both performance-wise and scale-wise.
>> Also, there is a combination of filters that in certain order won't
>> succeed.
>> 
>> Most of the time, when user inserts filters in chain, he knows right away
>> how the filters are going to look like - what type and option will they
>> have. For example, he knows that he will only insert filters of type
>> flower matching destination IP address. He can specify a template that
>> would cover all the filters in the chain.
>> 
>> This patchset is providing the possibility to user to provide such
>> template  to kernel and propagate it all the way down to device
>> drivers.
>
>This series doesn't apply cleanly to net-next, and also there seems to still
>be some discussion about how the iproute2 command line should look.

Will re-spin. Thanks.

>
>Thanks.