netdev - Re: [patch net-next 00/10] net: sched: introduce multichain support for filters

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Date:   Fri, 28 Apr 2017 10:40:24 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        David Ahern <dsa@...ulusnetworks.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        mlxsw@...lanox.com, Simon Horman <simon.horman@...ronome.com>
Subject: Re: [patch net-next 00/10] net: sched: introduce multichain support
 for filters

On Thu, Apr 27, 2017 at 11:53 PM, Jiri Pirko <jiri@...nulli.us> wrote:
> Thu, Apr 27, 2017 at 07:46:03PM CEST, xiyou.wangcong@...il.com wrote:
>>On Thu, Apr 27, 2017 at 4:12 AM, Jiri Pirko <jiri@...nulli.us> wrote:
>>> Simple example:
>>> $ tc qdisc add dev eth0 ingress
>>> $ tc filter add dev eth0 parent ffff: protocol ip pref 33 flower dst_mac 52:54:00:3d:c7:6d action goto chain 11
>>> $ tc filter add dev eth0 parent ffff: protocol ip pref 22 chain 11 flower dst_ip 192.168.40.1 action drop
>>> $ tc filter show dev eth0 root
>>
>>Interesting.
>>
>>I don't look into the code yet. If I understand the concepts correctly,
>>so with your patchset we can mark either filter with a chain No. to
>>choose which chain it belongs to _logically_ even though
>>_physically_ it is still in the old-fashion chain (prio, proto)?
>
> You have to see the code :)

I don't understand why I have to, these are high-level concepts
and should be put in your cover letter (aka. design doc). You miss
a lot of information about the ordering here.

Also the terms you use are confusing too, without your patchset
we have chains too, struct tcf_proto is a chain, each kind of filter
defines their own way to store their filters into this chain (tp->root),
and of course tp is chained in a singly-linked list too which turns
into multiple-chains.