linux-kernel - Re: [PATCH] xfrm: dst_entries_init() per-net dst

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Message-Id: <1446039763.132965.422568409.3FC44B03@webmail.messagingengine.com>
Date:	Wed, 28 Oct 2015 14:42:43 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Dan Streetman <dan.streetman@...onical.com>,
	Steffen Klassert <steffen.klassert@...unet.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Dan Streetman <ddstreet@...e.org>
Subject: Re: [PATCH] xfrm: dst_entries_init() per-net dst_ops

Hello,

On Wed, Oct 28, 2015, at 14:32, Dan Streetman wrote:
> On Tue, Oct 27, 2015 at 12:15 PM,  <dan.streetman@...onical.com> wrote:
> > From: Dan Streetman <dan.streetman@...onical.com>
> >
> > The ipv4 and ipv6 xfrms each create a template dst_ops object, and
> > perform dst_entries_init() on the template objects.  Then each net
> > namespace has its net.xfrm.xfrm[46]_dst_ops field set to the template
> > values.  The problem with that is the dst_ops.pcpuc_entries field is
> > a percpu counter and cannot be used correctly by simply copying it to
> > another object.

How hard would it be to split of the counters from the dst_ops struct?
We could make dst_ops instances const and have normal pointers to them
and keep the dst_entries as a small array in net namespace?

Bye,
Hannes
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