netdev - Re: Tulip 21142 panic on physical link disconnect

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Message-ID: <02e3f9b8-9e60-4574-88e2-906ccd727829@gmail.com>
Date: Tue, 10 Jun 2025 09:27:35 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Greg Chandler <chandleg@...ardsworks.org>, stable@...r.kernel.org
Cc: netdev@...r.kernel.org
Subject: Re: Tulip 21142 panic on physical link disconnect

Howdy!

On 6/9/25 15:43, Greg Chandler wrote:
> 
> This is a from-scratch build (non-vendor/non-distribution)
> Host/Target = alpha ev6
> Kernel source = 6.12.12
> 
> My last working kernel on this was a 2.6.x, it's been a while since I've 
> had time to bring this system up to date, so I don't know when this may 
> have started.
> I had a 3.0.102 in there, but I didn't test the networking while using it.
> 
> Please let me know what I can do to help out with figuring this one out.

I don't have an Alpha machine to try this on, but I do have a functional 
Cobalt Qube2 (MIPS 32/64) with these adapters connected directly over PCI:

00:07.0 Ethernet controller: Digital Equipment Corporation DECchip 
21142/43 (rev 41)
         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
ParErr+ Stepping- SERR- FastB2B- DisINTx-
         Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium 
 >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
         Latency: 64 (5000ns min, 10000ns max), Cache Line Size: 32 bytes
         Interrupt: pin A routed to IRQ 19
         Region 0: I/O ports at 1000 [size=128]
         Region 1: Memory at 12082000 (32-bit, non-prefetchable) [size=1K]
         Expansion ROM at 12000000 [disabled] [size=256K]
         Kernel driver in use: tulip


00:0c.0 Ethernet controller: Digital Equipment Corporation DECchip 
21142/43 (rev 41)
         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
ParErr- Stepping- SERR- FastB2B- DisINTx-
         Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium 
 >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
         Latency: 64 (5000ns min, 10000ns max), Cache Line Size: 32 bytes
         Interrupt: pin A routed to IRQ 20
         Region 0: I/O ports at 1080 [size=128]
         Region 1: Memory at 12082400 (32-bit, non-prefetchable) [size=1K]
         Expansion ROM at 12040000 [disabled] [size=256K]
         Kernel driver in use: tulip

the machine is not currently on a switch that I can control, but I can 
certainly try to plug in the cable and see what happens, give me a 
couple of days to get back to you, and if you don't hear back,  please 
holler. Here are the bits of kernel configuration:

CONFIG_NET_TULIP=y
CONFIG_TULIP=y
# CONFIG_TULIP_MWI is not set
# CONFIG_TULIP_MMIO is not set
# CONFIG_TULIP_NAPI is not set
-- 
Florian