netdev - RE: [net-next-2.6 RFC PATCH] ethtool: allow custom interval for physical identification

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Message-ID: <1302632599.2880.26.camel@bwh-desktop>
Date:	Tue, 12 Apr 2011 19:23:19 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	"Allan, Bruce W" <bruce.w.allan@...el.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [net-next-2.6 RFC PATCH] ethtool: allow custom interval for
 physical identification

On Tue, 2011-04-12 at 11:17 -0700, Allan, Bruce W wrote:
> >-----Original Message-----
> >From: Ben Hutchings [mailto:bhutchings@...arflare.com]
> >Sent: Tuesday, April 12, 2011 9:28 AM
> >To: Allan, Bruce W
> >Cc: Stephen Hemminger; netdev@...r.kernel.org
> >Subject: RE: [net-next-2.6 RFC PATCH] ethtool: allow custom interval for
> >physical identification
> >
> >I enquired here and found that we do have an OEM specifying 1 Hz.
> >
> >> FWIW, without digging too deep into how other drivers identify their
> >> respective ports through software, it appears it was split:
> >> * bnx2*, cxgb3, niu, s2io, sfc, sky2, tg3 - once per second
> >> * e100*, igb, ixgb*, pcnet32, ewrk3, cxgb4 - approx. twice per second
> >>
> >> AFAIK for parts that can set the physical identification through hardware,
> >> the Intel drivers set the on/off intervals to approximately twice/second;
> >> I don't know what other drivers do in that situation.
> >>
> >> So, I would guess it is not a common requirement to blink at a specific Hz.
> >> I have no problem with changing the hard-coded blink frequency to what our
> >> OEMs expect, but that might be an issue for those other vendors; I was just
> >> trying to make it flexible.
> >
> >Sadly it appears this is necessary.
> >
> >Let's define the return value for drivers wanting periodic callbacks to
> >be the blink frequency in Hz (normally 1 or 2), and get rid of the
> >special case of -EINVAL.  This also removes the rather inelegant
> >semantic that drivers may need to change their state despite returning
> >an error code.
> >
> >Ben.
> 
> OK.  Would you like me to send an updated patch?

Please.

Ben.

-- 
Ben Hutchings, Senior Software 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.

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