NetBSD Problem Report #22813

Received: (qmail 14471 invoked by uid 605); 16 Sep 2003 11:09:13 -0000
Message-Id: <>
Date: Tue, 16 Sep 2003 13:09:08 +0200 (MEST)
Subject: tlp driver reports wrong error for 21041
X-Send-Pr-Version: 3.95

>Number:         22813
>Category:       kern
>Synopsis:       tlp driver reports wrong error for 21041
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 16 11:10:00 +0000 2003
>Last-Modified:  Sun Nov 28 21:00:03 +0000 2010
>Originator:     Michael van Elst
>Release:        NetBSD 1.6.1_STABLE
                                Michael van Elst
                                "A potential Snark may lurk in every tree."

System: NetBSD fud 1.6.1_STABLE NetBSD 1.6.1_STABLE (FUD) #4: Mon Sep 15 14:42:36 MEST 2003     src@fud:/d/0/src/sys/arch/i386/compile/FUD i386
Architecture: i386
Machine: i386
When a DECchip 21041 based card isn't granted bus requests before the
internal receive FIFO fills up, it will report this in the buffer
descriptor in bit 0. Bit 3 of the descriptor is undefined.

Newer chips, like the 21143 do not use bit 0, it is always zero,
but they do use bit 3 to report MII errors.

The error bits in the descriptor are reported in /sys/dev/ic/tulip.c
line 1277ff.

send lots of data to a 21041 based Ethernet card on a slow motherboard
and watch the kernel report MII errors instead of overflows.

Make the error printing dependent on sc->sc_chip.

From: Sergey Svishchev <>
Subject: Re: kern/22813
Date: Sun, 28 Nov 2010 23:44:30 +0300

 This was partially fixed (bit 0 is still ignored):

 revision 1.160
 date: 2008/03/23 10:32:51;  author: tsutsui;  state: Exp;  lines: +18 -7
 Ignore the Report on MII error bit if chip doesn't have MII.
 Fixes annoying "tlp0: MII error" messages on Qube 2700 with 21041.

 Sergey Svishchev


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