netdev - Re: [patch net-next v11 00/13] net: sched: allow qdiscs to share filter block instances

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Date:   Wed, 17 Jan 2018 15:03:38 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     jiri@...nulli.us
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        mlxsw@...lanox.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        michael.chan@...adcom.com, ganeshgr@...lsio.com,
        saeedm@...lanox.com, matanb@...lanox.com, leonro@...lanox.com,
        idosch@...lanox.com, jakub.kicinski@...ronome.com,
        simon.horman@...ronome.com, pieter.jansenvanvuuren@...ronome.com,
        john.hurley@...ronome.com, alexander.h.duyck@...el.com,
        ogerlitz@...lanox.com, john.fastabend@...il.com,
        daniel@...earbox.net, dsahern@...il.com
Subject: Re: [patch net-next v11 00/13] net: sched: allow qdiscs to share
 filter block instances

From: David Miller <davem@...emloft.net>
Date: Wed, 17 Jan 2018 14:55:35 -0500 (EST)

> From: Jiri Pirko <jiri@...nulli.us>
> Date: Wed, 17 Jan 2018 11:46:44 +0100
> 
>> Currently the filters added to qdiscs are independent. So for example if you
>> have 2 netdevices and you create ingress qdisc on both and you want to add
>> identical filter rules both, you need to add them twice. This patchset
>> makes this easier and mainly saves resources allowing to share all filters
>> within a qdisc - I call it a "filter block". Also this helps to save
>> resources when we do offload to hw for example to expensive TCAM.
> 
> Series applied, thanks Jiri et al.

Jiri, I'm not going to revert because of this, but please give me a follow-up
patch which deals with this warning:

net/sched/cls_api.c: In function ‘tc_dump_tfilter’:
net/sched/cls_api.c:1362:8: warning: ‘parent’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   if (!tcf_chain_dump(chain, q, parent, skb, cb,
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
         index_start, &index))
         ~~~~~~~~~~~~~~~~~~~~

It's one of those:

	u32 var;

	if (condition) {
		...
		goto out;
	} else {
		var = whatever;
	}
	use(var);
out:
	...

situations that GCC can't seem to see properly.

Thanks.