netdev - Re: [PATCH net] net/sched: properly init chain in case of multiple control actions

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Date:   Sat, 13 Oct 2018 17:23:06 +0200
From:   Davide Caratti <dcaratti@...hat.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, Jamal Hadi Salim <jhs@...atatu.com>,
        David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net] net/sched: properly init chain in case of multiple
 control actions

On Fri, 2018-10-12 at 13:57 -0700, Cong Wang wrote:
> Why not just validate the fallback action in each action init()?
> For example, checking tcfg_paction in tcf_gact_init().
> 
> I don't see the need of making it generic.

hello Cong, once again thanks for looking at this.

what you say is doable, and I evaluated doing it before proposing this
patch.

But I felt unconfortable, because I needed to pass struct tcf_proto *tp in
tcf_gact_init() to initialize a->goto_chain with the chain_idx encoded in
the fallback action. So, I would have changed all the init() functions in
all TC actions, just to fix two of them.

A (legal?) trick  is to let tcf_action store the fallback action when it
contains a 'goto chain' command, I just posted a proposal for gact. If you
think it's ok, I will test and post the same for act_police.

regards,
-- 
davide