linux-kernel - Re: [PATCH net-next v2 0/8] net: extend ethtool link mode bitmaps to 48 bits

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Date:	Tue, 06 Jan 2015 23:08:39 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	David Miller <davem@...emloft.net>
Cc:	amirv@...lanox.com, ddecotig@...il.com, f.fainelli@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org, saeedm@...lanox.com, decot@...glers.com,
	jasowang@...hat.com, mst@...hat.com, herbert@...dor.apana.org.au,
	viro@...iv.linux.org.uk, yamato@...hat.com, xii@...gle.com,
	nhorman@...driver.com, xiyou.wangcong@...il.com, fbl@...hat.com,
	teg@...m.no, jiri@...nulli.us, vyasevic@...hat.com,
	ebiederm@...ssion.com, VenkatKumar.Duvvuru@...lex.Com,
	_govind@....com
Subject: Re: [PATCH net-next v2 0/8] net: extend ethtool link mode bitmaps
 to 48 bits

On Tue, 2015-01-06 at 17:29 -0500, David Miller wrote:
> From: Amir Vadai <amirv@...lanox.com>
> Date: Tue, 6 Jan 2015 15:56:33 +0200
> 
> > Mellanox is about to release next month a driver for a new NIC, with 3
> > new speeds * few link modes for each + new link modes for 10G.
> > It seems that we will need to consume almost all the new bits.
> 
> This tells me that the approach to this problem needs to be rethought.
> 
> Maybe we just need to bite the bullet and make a new ETHTOOL_GSET_2
> and ETHTOOL_SSET_2 or whatever you want to name them.
> 
> Then we can define a completely new structure, with 64-bit bitmaps
> for link modes or whatever.  The ethtool_op callbacks work using
> this structure, and only the net/core/ethtool.c code knows about
> the older structure and translates to/from for ETHTOOL_{GSET,SSET}.

Agreed.

Ben.

-- 
Ben Hutchings
This sentence contradicts itself - no actually it doesn't.

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