netdev - Re: Linux kernel commit breaks IPMI on iface downing

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Message-ID: <1439515834.7684.24.camel@LTIRV-MCHAN1.corp.ad.broadcom.com>
Date:	Thu, 13 Aug 2015 18:30:34 -0700
From:	Michael Chan <mchan@...adcom.com>
To:	Sébastien Bocahu <sbu@...ortlinker.com>,
	<harish.patil@...gic.com>
CC:	<davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: Linux kernel commit breaks IPMI on iface downing

+netdev and Harish who is the current maintainer of bnx2 at qlogic.

The patch in question effectively just removes the
bnx2_set_power_state() call during "ip link set down".  If there is
IPMI, the firmware should know the link needs to stay up when the driver
resets the device during bnx2_close().  This should be a very common
scenario.  Please provide the firmware versions to Harish with ethtool
-i.  Perhaps upgrading the firmware can resolve this issue.

On Thu, 2015-08-13 at 15:47 +0200, Sébastien Bocahu wrote: 
> Hi,
> 
> Being unable to install Debian Jessie via IPMI on mainstream Dell R410
> servers that used to be well supported by Debian Wheezy, I tracked the
> problem down to a specific commit in the Linux kernel, specifically in
> the bnx2 driver.
> The issue is that "ip link set eth0 down" takes the Ethernet part of
> the BMC down (shared NIC for BMC+eth0), cutting off the IPMI session.
> The BMC gets back only after power cycling.
> 
> Hardware: Dell R410 w/ a Broadcom 5716 NIC:
> Ethernet controller: Broadcom Corporation NetXtreme II BCM5716 Gigabit
> Ethernet (rev 20)  )
> Part number: BCM95716C1
> Vendor specific: 6.4.5 (Firmware has been updated to the latest
> version available by Dell's support website)
> 
> I built many kernels to track which change caused the issue and it
> seems that's :
> 25bfb1dd4ba3b2d9a49ce9d9b0cd7be1840e15ed (bnx2: Add pci shutdown handler.)
> 
> Before, 'ip link set eth0 down' would just cause 2/3s of packet loss
> but IPMI would still be working afterwards.
> 
> I'm available for more informations and/or testing if needed.
> 
> Thanks !
> 
> 
> 


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