netdev - Re: [PATCH net-next 12/14] mlx4: use netdev_rss_key

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Message-ID: <1416700690.20938.34.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sat, 22 Nov 2014 15:58:10 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Thomas Lendacky <Thomas.Lendacky@....com>,
	Ariel Elior <ariel.elior@...gic.com>,
	Michael Chan <mchan@...adcom.com>,
	Prashant Sreedharan <prashant@...adcom.com>,
	Rasesh Mody <rasesh.mody@...gic.com>,
	Sathya Perla <sathya.perla@...lex.com>,
	Subbu Seetharaman <subbu.seetharaman@...lex.com>,
	Ajit Khaparde <ajit.khaparde@...lex.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Amir Vadai <amirv@...lanox.com>,
	Shradha Shah <sshah@...arflare.com>,
	Shreyas Bhatewara <sbhatewara@...are.com>
Subject: Re: [PATCH net-next 12/14] mlx4: use netdev_rss_key_fill() helper

On Sat, 2014-11-22 at 21:49 +0000, Ben Hutchings wrote:
> On Sun, 2014-11-16 at 06:23 -0800, Eric Dumazet wrote:
> > Use of well known RSS key increases attack surface.
> > Switch to a random one, using generic helper so that all
> > ports share a common key.
> > 
> > Also provide ethtool -x support to fetch RSS key
> [...]
> > @@ -1799,6 +1805,7 @@ const struct ethtool_ops mlx4_en_ethtool_ops = {
> >  	.get_rxnfc = mlx4_en_get_rxnfc,
> >  	.set_rxnfc = mlx4_en_set_rxnfc,
> >  	.get_rxfh_indir_size = mlx4_en_get_rxfh_indir_size,
> > +	.get_rxfh_key_size = mlx4_en_get_rxfh_key_size,
> >  	.get_rxfh = mlx4_en_get_rxfh,
> >  	.set_rxfh = mlx4_en_set_rxfh,
> [...]
> 
> A driver that implements get_rxfh_key_size() and set_rxfh() is assumed
> to support setting the RSS key (and only the key).  However,
> mlx4_en_set_rxfh() will currently crash if a new indirection table is
> not provided.

Hi Ben.

Is this a net-next only concern, or is it an existing problem in net
tree ?

Thanks !


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