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

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Message-Id: <20180628.134826.1129904828597717313.davem@davemloft.net>
Date:   Thu, 28 Jun 2018 13:48:26 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     jiri@...nulli.us
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

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.

Thanks.