netdev - Re: [RFC PATCH 4/9] ipvs network name space aware

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Message-ID: <201010130707.28585.hans.schillstrom@ericsson.com>
Date:	Wed, 13 Oct 2010 07:07:28 +0200
From:	Hans Schillstrom <hans.schillstrom@...csson.com>
To:	Daniel Lezcano <daniel.lezcano@...e.fr>
CC:	"lvs-devel@...r.kernel.org" <lvs-devel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"horms@...ge.net.au" <horms@...ge.net.au>, "ja@....bg" <ja@....bg>,
	"wensong@...ux-vs.org" <wensong@...ux-vs.org>
Subject: Re: [RFC PATCH 4/9] ipvs network name space aware

On Tuesday 12 October 2010 18:02:37 Daniel Lezcano wrote:
> On 10/08/2010 01:16 PM, Hans Schillstrom wrote:
> > This patch just contains ip_vs_core.c
> >
> > Signed-off-by:Hans Schillstrom<hans.schillstrom@...csson.com>
> >
> > diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
> > index 0c043b6..4fdc5cb 100644
> > --- a/net/netfilter/ipvs/ip_vs_core.c
> > +++ b/net/netfilter/ipvs/ip_vs_core.c
> > @@ -52,7 +52,6 @@
> >
> >   #include<net/ip_vs.h>
> >
> > -
> >   EXPORT_SYMBOL(register_ip_vs_scheduler);
> >   EXPORT_SYMBOL(unregister_ip_vs_scheduler);
> >   EXPORT_SYMBOL(ip_vs_proto_name);
> > @@ -67,6 +66,8 @@ EXPORT_SYMBOL(ip_vs_conn_put);
> >   EXPORT_SYMBOL(ip_vs_get_debug_level);
> >   #endif
> >
> > +/* netns cnt used for uniqueness */
> > +static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0);
> >    
> 
> Why is this counter needed ?
> 
It's an incarnation counter that's used globally to name 
 - cachemem
 - master/backup thread

> [ cut ]
> 
> > + *	Initialize IP Virtual Server netns mem.
> > + */
> > +static int __net_init __ip_vs_init(struct net *net)
> > +{
> > +	struct netns_ipvs *ipvs = 0;
> >
> > +	ipvs = kzalloc(sizeof(struct netns_ipvs), GFP_ATOMIC);
> > +	if( ipvs == NULL ) {
> > +		pr_err("%s(): no memory.\n", __func__);
> > +		return -ENOMEM;
> > +	}
> > +	ipvs->inc = atomic_read(&ipvs_netns_cnt);
> >    
> 
> AFAICS, this counter is never used. Is it really needed ?
> 
> > +	atomic_inc(&ipvs_netns_cnt);
> > +	IP_VS_DBG(10, "Creating new netns *net=%p *ipvs=%p size=%lu\n",
> > +		     net, ipvs, sizeof(struct netns_ipvs));
> > +	net->ipvs = ipvs;
> > +
> > +	return 0;
> > +}
> >    
> 
> 

-- 
Regards
Hans Schillstrom <hans.schillstrom@...csson.com>
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