netdev - Re: bnx2, 2.6.29, smp_affinity strangeness

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Message-ID: <C27F8246C663564A84BB7AB3439772421666854D2A@IRVEXCHCCR01.corp.ad.broadcom.com>
Date:	Thu, 2 Apr 2009 22:26:26 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"'Denys Fedoryschenko'" <denys@...p.net.lb>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: bnx2, 2.6.29, smp_affinity strangeness

Denys Fedoryschenko wrote:

> While running bnx2 tried to assign affinity to network card
> and ... failed.
>

This is a known problem on the 5708 card that does not support
MSI per vector masking.  On the 5708 NIC, the new MSI address/
data will only take effect after MSI has been disabled and
re-enabled.

The IRQ migration code in the kernel no longer disables the MSI
on devices that don't support per masking before IRQ migration.
As a result, changing IRQ affinity will not work after the device
is initialized.  You can force a reset, (by doing some ethtool
operation for example), after you change the affinity and it should
work.

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