linux-kernel - Re: [PATCH 6/7] sock, cgroup: add sock->sk

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Message-ID: <20151120191228.GA28383@mtj.duckdns.org>
Date:	Fri, 20 Nov 2015 14:12:28 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Daniel Wagner <daniel.wagner@...-carit.de>
Cc:	davem@...emloft.net, pablo@...filter.org, kaber@...sh.net,
	kadlec@...ckhole.kfki.hu, lizefan@...wei.com, hannes@...xchg.org,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	coreteam@...filter.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-team@...com,
	daniel@...earbox.net, nhorman@...driver.com
Subject: Re: [PATCH 6/7] sock, cgroup: add sock->sk_cgroup

Hello, Daniel.

On Fri, Nov 20, 2015 at 12:04:05PM +0100, Daniel Wagner wrote:
> >  static inline u16 sock_cgroup_prioidx(struct sock_cgroup_data *skcd)
> >  {
> > -	return skcd->prioidx;
> > +	return (skcd->is_data & 1) ? skcd->prioidx : 1;
> >  }
> >  
> >  static inline u32 sock_cgroup_classid(struct sock_cgroup_data *skcd)
> >  {
> > -	return skcd->classid;
> > +	return (skcd->is_data & 1) ? skcd->classid : 0;
> >  }
> 
> 
> I still try to understand what the code does, hence this stupid question:
> 
> Why is sock_cgroup_prioidx() returning 1 if is not data and
> sock_cgroup_classid() a 0?

I prolly should have added comments there.  prioidx carries the cgroup
ID on the hierarchy net_prio is attached to, so if nothing is
configured, the default value would be the ID of the root cgroup which
is always 1.  For net_cls, the unconfigured default value is zero.
Will refresh the patch with comments.

Thanks.

-- 
tejun
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