linux-kernel - Re: [PATCH net-next v1 0/7] net: extend ethtool link mode bitmaps to 48 bits

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Message-ID: <1420425003.5686.155.camel@decadent.org.uk>
Date:	Mon, 05 Jan 2015 02:30:03 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Maciej Żenczykowski <zenczykowski@...il.com>
Cc:	David Decotigny <ddecotig@...il.com>,
	Amir Vadai <amirv@...lanox.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Linux NetDev <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-api@...r.kernel.org, David Decotigny <decot@...glers.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jason Wang <jasowang@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Al Viro <viro@...iv.linux.org.uk>,
	Masatake YAMATO <yamato@...hat.com>, Xi Wang <xii@...gle.com>,
	Neil Horman <nhorman@...driver.com>,
	WANG Cong <xiyou.wangcong@...il.com>,
	Flavio Leitner <fbl@...hat.com>, Tom Gundersen <teg@...m.no>,
	Jiri Pirko <jiri@...nulli.us>,
	Vlad Yasevich <vyasevic@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Saeed Mahameed <saeedm@...lanox.com>,
	Venkata Duvvuru <VenkatKumar.Duvvuru@...lex.com>,
	Govindarajulu Varadarajan <_govind@....com>
Subject: Re: [PATCH net-next v1 0/7] net: extend ethtool link mode bitmaps
 to 48 bits

On Mon, 2015-01-05 at 01:34 +0100, Maciej Żenczykowski wrote:
> >> I can send updates to other drivers, even though it's rather pointless
> >> to update 1G drivers at this point for example. Please let me know,
> >> but I'd prefer to do this in follow-up patches outside this first
> >> patch series.
> > [...]
> >
> > They should be changed to ensure they reject setting any of the high
> > advertising flags, but it's not urgent.
> 
> if old drivers advertised a get/set_bits function while new drivers
> advertised a get/set_new_bits function,
> you could not updated any old drivers, and simply take care of
> rejecting invalid bits in core, by calling set_new_bits if provided,
> if not, rejecting bad bits and calling set_bits if no bad bits were
> set.

We've never checked that the reserved fields are zero before, and I
think there are still drivers that don't fully validate the existing 32
bits.  So while I think drivers should fully validate the advertising
flags, userland generally can't assume they do.  And therefore I don't
think it's worth adding complexity to the ethtool core that only partly
fixes this.

Ben.

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

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