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From: YongHyeon PYUN <pyunyh@gmail.com>
Date: Sun, 26 May 2013 20:38:41 +0900
To: Hiroki Sato <hrs@freebsd.org>
Subject: Re: Apparent fxp regression in FreeBSD 8.4-RC3
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On Fri, May 24, 2013 at 04:36:46PM +0900, Hiroki Sato wrote:
> Hiroki Sato <hrs@FreeBSD.org> wrote
>   in <20130524.162926.395058052118975996.hrs@allbsd.org>:
> 
> hr> YongHyeon PYUN <pyunyh@gmail.com> wrote
> hr>   in <20130524054720.GA1496@michelle.cdnetworks.com>:
> hr>
> hr>  A workaround is specifying the following line in rc.conf:
> hr>
> hr>  ifconfig_fxp0="DHCP media 100baseTX mediaopt full-duplex"
> 
>  Hmm, I guess this can happen on other NICs when the link negotiation
>  causes a link-state flap.  Is it true?

Probably not. AFAIK fxp(4) is the only controller that requires two
full resets to support flow control. Multicast programming for
fxp(4) also requires full controller reset so trying to renew its
existing lease for fxp(4) looks wrong to me.

> 
> -- Hiroki