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Date: Fri, 16 May 2003 11:34:58 -0400 (EDT)
From: Robert Watson <rwatson@FreeBSD.org>
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To: "Daniel C. Sobral" <dcs@tcoip.com.br>
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Subject: Re: cvs commit: src/sys/dev/fxp if_fxp.c
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On Fri, 16 May 2003, Daniel C. Sobral wrote:

> >   Add a tunable/sysctl "hw.fxp_noflow" which disables flow control support
> >   on if_fxp cards.  When flow control is enabled, if the operating system
> >   doesn't acknowledge the packet buffer filling, the card will begin to
> >   generate ethernet quench packets, but appears to get into a feedback
> >   loop of some sort, hosing local switches.  This is a temporary workaround
> >   for 5.1: the ability to configure flow control should probably be
> >   exposed by some or another management interface on ethernet link layer
> >   devices.
> 
> Looks like a mediaopt candidate to me. Though mediaopt is usually only
> used for half/full-dulpex, there's the "link0" specification on some
> cards that does something different. 
> 
> Alas, all the interface "capabilities" ought to be tweakable in some
> standard fashion. For instance, why are special words for txcsum and
> txcsum, when there's also vlan-tagging support and other capabilities
> that could be set/unset from a single place? 
> 
> I'm in favor of mediaopt/-mediaopt, but... <shrug>

Sounds reasonable to me.  Got a patch? :-)

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Network Associates Laboratories