netdev - Re: [patch net-next v2 02/10] net: sched: introduce tcf block infractructure

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Date:   Tue, 16 May 2017 15:10:34 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jamal Hadi Salim <jhs@...atatu.com>
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,
        simon.horman@...ronome.com, mlxsw@...lanox.com
Subject: Re: [patch net-next v2 02/10] net: sched: introduce tcf block
 infractructure

Tue, May 16, 2017 at 02:52:31PM CEST, jhs@...atatu.com wrote:
>On 17-05-16 08:23 AM, Jiri Pirko wrote:
>> Tue, May 16, 2017 at 02:07:25PM CEST, jhs@...atatu.com wrote:
>> > 
>> > Jiri,
>> > 
>> > I am sorry i am tied up elsewhere but will respond in chunks.
>> > 
>> > On 17-05-15 04:38 AM, Jiri Pirko wrote:
>> > 
>> > 
>> > >  static inline void qdisc_cb_private_validate(const struct sk_buff *skb, int sz)
>> > >  {
>> > >  	struct qdisc_skb_cb *qcb;
>> > 
>> > 
>> > > +int tcf_block_get(struct tcf_block **p_block,
>> > > +		  struct tcf_proto __rcu **p_filter_chain)
>> > > +{
>> > > +	struct tcf_block *block = kzalloc(sizeof(*block), GFP_KERNEL);
>> > > +
>> > > +	if (!block)
>> > > +		return -ENOMEM;
>> > > +	block->p_filter_chain = p_filter_chain;
>> > > +	*p_block = block;
>> > > +	return 0;
>> > > +}
>> > 
>> > tcf_block_get() sounds odd. tcf_block_create()?
>> 
>> I used get/put because I plan to allow sharing of block between qdiscs
>> in future. Then there will be a refcount.
>> 
>
>Ok, I guess I should read further into the patches..
>
>
>> > > -static struct tcf_proto __rcu **atm_tc_find_tcf(struct Qdisc *sch,
>> > > -						unsigned long cl)
>> > > +static struct tcf_block *atm_tc_tcf_block(struct Qdisc *sch, unsigned long cl)
>> > 
>> > Any reason you removed the verb "find" from all these calls?
>> > eg above: better to have atm_tc_tcf_block_find()?
>> 
>> Yeah, I was thinking about it. The thing is, the callback does not do
>> any lookup so "find" is not accurate. Also without "find" this is
>> shorter so I decided for this naming variant.
>> 
>
>They do select some chain - at least that was the intent.
>Are you not planning to use this to pick a chain in a block?

No. I just need to use this to get the whole block of chains.