netdev - Re: [patch net-next 10/10] net: sched: extend gact to allow jumping to another filter chain

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Date:   Sun, 30 Apr 2017 07:08:52 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        xiyou.wangcong@...il.com, dsa@...ulusnetworks.com,
        edumazet@...gle.com, stephen@...workplumber.org,
        daniel@...earbox.net, alexander.h.duyck@...el.com,
        mlxsw@...lanox.com, simon.horman@...ronome.com
Subject: Re: [patch net-next 10/10] net: sched: extend gact to allow jumping
 to another filter chain

On 17-04-28 09:47 AM, Jiri Pirko wrote:
[..]
> I will try to figure out how to extend GOTO_CHAIN action for other
> actions.
>
> So basically, you suggest to encode chain number into the action opcode,
> like you do it in jump, right? For example:
> #define TC_ACT_GOTO_CHAIN       0x20000000
>
> And then I will have chainlimit 0x10000000-1
>

If you pick a range to own (one that is not being used)
like 0x20000000 then chain limit starts at 0x20000001
to some upper bound. I dont know if you need all the range,
but if you put upper bound to 0x2FFFFFFF that is a few
million.

cheers,
jamal