netdev - Re: [PATCH net-next] net: avoid a full fib lookup when rp

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Date:   Tue, 19 Sep 2017 14:46:41 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net-next] net: avoid a full fib lookup when rp_filter is
 disabled.

Hi,

On Tue, 2017-09-19 at 05:00 -0700, Eric Dumazet wrote:
> On Tue, 2017-09-19 at 12:46 +0200, Paolo Abeni wrote:
> ..
> 
> > Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
> > Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> > ---
> > +/* called under RCU lock */
> > +struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr)
> > +{
> > +	u32 hash = inet_addr_hash(net, addr);
> > +	struct in_ifaddr *ifa;
> > +
> > +	hlist_for_each_entry_rcu(ifa, &inet_addr_lst[hash], hash)
> > +		if (ifa->ifa_local == addr &&
> > +		    net_eq(dev_net(ifa->ifa_dev->dev), net))
> > +			return ifa;
> > +
> > +	return NULL;
> > +}
> > +

Thank you for reviewing this!

> Any particular reason you do not use this helper to replace the lookup
> in __ip_dev_find() ?

uh, I just missed that opportunity. I'll send a v2, thanks!

Paolo