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

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Message-ID: <9e6516f7-92b9-b151-42ba-2b658d289ae3@mojatatu.com>
Date:   Sun, 14 Oct 2018 09:46:34 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Davide Caratti <dcaratti@...hat.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, 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 2018-10-13 11:23 a.m., Davide Caratti wrote:
> 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.
> 

Need some more thought. So the issue here is the goto chain failed
the configured chain doesnt exist?

cheers,
jamal