Date: Fri, 31 Mar 2000 12:33:13 -0500 From: "Matthew Zahorik" <matt@thebiz.net> To: <freebsd-hackers@freebsd.org> Subject: BOOTP kernel modification Message-ID: <019001bf9b37$3111f430$1401eed8@mahatma>
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Hello!
I have a problem where I'm trying to bootp an Alpha box. It works great
over a hub, but through a switch it fails miserably.
I tracked it down to a bad autoconfiguration. The switch is
autonegotiating 100Mb/fdx and the client is autonegotiating 100Mb/hdx.
Needless to say, this doesn't help with BOOTP requests - things tend to time
out. Forcing the switch to 100Mb/hdx makes the process work smoothly.
Forcing the switch to 100Mb/fdx causes more timeouts.
For other reasons, I'd like to force the switch to 100Mb/fdx at all times,
and just force the BOOTP process to initialize the card at a 100Mb/fdx.
I'm new to kernel programming, so I'd like someone to tell me if this is
the correct way to do this.
In nfs/bootp_subr.c in the function bootpc_fakeup_interface you have:
/*
* Bring up the interface.
*
* Get the old interface flags and or IFF_UP into them; if
* IFF_UP set blindly, interface selection can be clobbered.
*/
error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, procp);
if (error)
panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
ireq->ifr_flags |= IFF_UP;
error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, procp);
if (error)
panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
to which I'd add:
ireq->ifr_media = IFF_100_TX | IFF_FDX;
error = ifioctl(so, SIOCSIFMEDIA, (caddr_t)ireq, procp);
if (error)
panic("bootpc_fakeup_interface: SIFMEDIA, error=%d", error);
right before the SIOCGIFFFLAGS ioctl, so the media type would be set
before
the interface would be brought up.
Will this work? (: Is the interface initialized somewhere else in the
kernel?
(excluding ifconfigs in startup scripts, which I'm well aware of)
If it doesn't work, how do I get this bit of code to force 100Mb/fdx?
I have no problem making this into a kernel option like 'option
BOOTP_FORCE_MEDIA="IFF_100_TX | IFF_FDX" '
Also, netboot will have to be changed (yes, it works on Alpha just fine) b
ut
I can't get it to compile. Before I monkey around with it more, is there
a
magic trick? It currently breaks looking for net.h and net_if.h
Finally, the link and activity lights don't work on these machines after
the
kernel boots:
dc0: <Intel 21143 10/100BaseTX> port 0x1100-0x117f mem 0x20c2000-0x20c23ff
\
irq 29 at device 9.0 on pci0
dc0: interrupting at TSUNAMI irq 29
dc0: Ethernet address: 08:00:2b:86:28:54
miibus0: <MII bus> on dc0
dcphy0: <Intel 21143 NWAY media interface> on miibus0
dcphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
What part of the code should I look at to get this working?
This is all on 4.0-RELEASE on a Tsunami based Alpha (DS10, 466MHz EV6)
Thanks!
- Matt
--
Matthew Zahorik Director of Systems and Networking - BiznessOnline.com
matt@thebiz.net President of AlbanyNet Inc. - a BiznessOnline subsidiary
maz@albany.net Voice: (518) 292-1001 Fax: (518) 626-0793
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