Re: MSI failure on nForce 430 (WAS: intel 82571EB gigabit fails tosee link on 2.6.20-rc5 in-tree e1000 driver (regression))

From: Auke Kok
Date: Fri Feb 02 2007 - 12:26:21 EST


Adrian Bunk wrote:
On Sat, Jan 20, 2007 at 02:34:37PM -0500, Adam Kropelin wrote:
(cc: list trimmed and thread moved to linux-pci)

I have a PCI-E e1000 card that does not see interrupts on 2.6.20-rc5 unless CONFIG_PCI_MSI is disabled. An e1000 maintainer indicated that the PHY state is correct, it's just that the interrupt is not getting thru to the kernel. Interestingly, on 2.6.19 PHY interrupts get thru ok with MSI enabled (link status responds appropriately) but packet tx fails with timeout errors, implying that perhaps MAC interrupts are not arriving.

I've attached the contents dmesg, 'lspci -vvv', and 'cat /proc/interrupts' from 2.6.20-rc5.

This is an nForce 430 based chipset on a Dell E521 which has had interrupt routing issues before. Prior to 2.6.19 it had to be booted with 'noapic' in order to come up at all. It also had USB lockup problems until I applied the latest BIOS update (v1.1.4). So a BIOS interrupt routing bug with MSI is not out of the question.

I'm happy to gather more data or run tests...

Was this regression fixed by Eric's patch that is included in -rc7?

no, this is a different issue afaics. Eric's patch solves a msi vector leak where MSI's were no longer recovered after all 256 of them were handed out. The issue here seems to be a very different regression (no vector at all or vector not setup correctly to begin with).

I do suggest re-testing the issue with 2.6.20rc7, but it's unlikely it fixes the problem for Adam.

The same issue was reported 2/3 days ago by another user basically too (no interrupts at all arriving with MSI enabled).

Cheers,

Auke
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