kern/110561 "em" driver shuts down interface when "ifconfig media 100baseTX" is invoked

[Jack Vogel]

The following reply was made to PR kern/110561; it has been noted by GNATS.

From: "Jack Vogel" <jfvogel at gmail.com>
To: "Infraservice hostmaster" <hostmaster at infra-service.ca>
Cc: "Kris Kennaway" <kris at obsecurity.org>, freebsd-bugs at freebsd.org, 
	bug-followup at freebsd.org
Subject: Re: kern/110561 "em" driver shuts down interface when "ifconfig media 100baseTX" is invoked
Date: Tue, 20 Mar 2007 17:22:42 -0700

 On 3/20/07, Infraservice hostmaster <hostmaster at infra-service.ca> wrote:
 > |
 > | On Tue, Mar 20, 2007 at 07:40:10AM +0000, Infraservice hostmaster wrote:
 > | > The following reply was made to PR kern/110561; it has been noted by GNATS.
 > | >
 > | > From: Infraservice hostmaster <hostmaster at Infra-Service.ca>
 > | > To: bug-followup at freebsd.org
 > | > Cc:
 > | > Subject: Re: kern/110561 "em" driver shuts down interface when "ifconfig media 100baseTX" is invoked
 > | > Date: Tue, 20 Mar 2007 03:31:54 -0400 (EDT)
 > | >
 > | >  |
 > | >  | Synopsis: :"em" driver shuts down interface when "ifconfig  media 100baseTX"  is invoked
 > | >  |
 > | >  | State-Changed-From-To: open->closed
 > | >  | State-Changed-By: remko
 > | >  | State-Changed-When: Tue Mar 20 06:42:06 UTC 2007
 > | >  | State-Changed-Why:
 > | >  | This is not a bug, this is a problem in the negotiation on the other
 > | >  | side. If the switch you are attaching to is not supporting the fixed
 > | >  | setting of the speed and duplex settings or incorrectly negotiates then
 > | >  | this is not a problem of the driver nor the card but a switching
 > | >  | problem. Please try to findout FIRST what the real problem is and THEN
 > | >  | get back to me if this really is a FreeBSD problem (Discuss this on the
 > | >  | networking mailinglist please >
 > | >  | http://lists.freebsd.org/mailman/listinfo/freebsd-net/).
 > | >
 > | >
 > | >     This happens to every interface we tried it on!
 > |
 > | Right, which is consistent with the switch failing to negotiate.
 >
 >
 >         wrong, each interface connects to distinctly different devices
 >
 >         one is a cisco adsl router, another is a FBSD 6.2 box with an
 >         Intel fxp card - it ifconfigs media/mediaopt just fine BTW
 
 So, if each 'distinctly different device' can't handle forcing the speed
 then Kris's assertion still holds.
 
 Our test group at Intel has a wide range of hardware, and they do
 extensive tests on forcing speed/duplex, I am unaware of any
 outstanding bugs on this issue.
 
 Cheers,
 
 Jack