netdev - RE: [PATCH] ethtool: don't overwrite useful bits in advertising bitfield

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Message-ID: <A612847CFE53224C91B23E3A5B48BAC7534E8D7DB1@xmail3.se.axis.com>
Date:	Fri, 24 Aug 2012 11:50:14 +0200
From:	Johan Gunnarsson <johan.gunnarsson@...s.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Mikael Starvik <starvik@...s.com>
Subject: RE: [PATCH] ethtool: don't overwrite useful bits in advertising
 bitfield



> -----Original Message-----
> From: Ben Hutchings [mailto:bhutchings@...arflare.com]
> Sent: den 21 augusti 2012 19:03
> To: Johan Gunnarsson
> Cc: netdev@...r.kernel.org; Mikael Starvik
> Subject: RE: [PATCH] ethtool: don't overwrite useful bits in
> advertising bitfield
> 
> [...]
> 
> <linux/ethtool.h> or ethtool-copy.h currently defines the meanings of
> bits 0-26 in the supported field.  You define ALL_ADVERTISED_MODES to
> include all of those that are link modes.  But some time in the future,
> the remaining bits will be assigned to new capabilities.
> 
> If today's ethtool is used with a newer driver that sets bit 27 in its
> supported field, ethtool can't tell whether that represents a new link
> mode that should be included in ALL_ADVERTISED_MODES, or some other
> kind
> of capability.  So it may not be able to set the driver's advertising
> mask correctly.

I see. Thanks. I'll submit new version of the patch.

> 
> Ben.
> 
> --
> Ben Hutchings, Staff Engineer, Solarflare
> Not speaking for my employer; that's the marketing department's job.
> They asked us to note that Solarflare product names are trademarked.