netdev - Re: [PATCH net-next 01/14] net: provide a per host RSS key generic infrastructure

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Message-ID: <87wq6uiass.fsf@tassilo.jf.intel.com>
Date:	Sun, 16 Nov 2014 22:46:43 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <edumazet@...gle.com>
Cc:	"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 01/14] net: provide a per host RSS key generic infrastructure

Eric Dumazet <edumazet@...gle.com> writes:

> Some drivers use a constant (and well known key), some drivers use a random
> key per port, making bonding setups hard to tune. Well known keys increase
> attack surface, considering that number of queues is usually a power of two.

Wouldn't it be better to have some kernel facility to query on what
port a given mapping would end up rather than exporting
the key? Similar to querying the rounting table.
That would be more abstract.

> +	{
> +		.procname	= "netdev_rss_key",
> +		.data		= &netdev_rss_key,
> +		.maxlen		= sizeof(int),
> +		.mode		= 0444,

Surely 0400 ? After all it's a kind a "secret"

-Andi
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