netdev - Re: [PATCHv2 net-next 01/15] net: add skb_dst_set

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Date:	Sun, 10 Mar 2013 05:17:35 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ja@....bg
Cc:	horms@...ge.net.au, lvs-devel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCHv2 net-next 01/15] net: add skb_dst_set_unref

From: Julian Anastasov <ja@....bg>
Date: Sat,  9 Mar 2013 23:16:41 +0200

> 	skb_dst_set_unref will use noref version even for
> DST_NOCACHE entries because DST_NOCACHE means dst is not
> cached in routing structures, still dst could be cached
> by routing users and used to produce noref instances.
> 
> Signed-off-by: Julian Anastasov <ja@....bg>

I'm fine with this approach, but I think the name of this
interface could be better.

In fact you could do something like:

1) Rename skb_dst_set_noref() to __skb_dst_set_noref() and add
   a new "bool force" parameter.  DST_NOCACHE check is overriden
   when 'force' is true.

2) skb_dst_set_noref() is an inline that passes 'force' as false.

3) New interface skb_dst_set_noref_force() passes 'force' as true
   and will be used by your IPVS changes.

Then all of the RCU checks etc. happen in one shared function.
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