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

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Date:	Fri, 14 Aug 2015 11:22:22 +0200
From:	Sébastien Bocahu <sbu@...ortlinker.com>
To:	Michael Chan <mchan@...adcom.com>
Cc:	harish.patil@...gic.com, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: Linux kernel commit breaks IPMI on iface downing

The BNX2 firmware has already been updated to the latest version
available from Dell.

root@...ian:~# ethtool -i eth0 | grep firmware
firmware-version: 6.4.5 bc 5.2.3 NCSI 2.0.11

2015-08-14 3:30 GMT+02:00 Michael Chan <mchan@...adcom.com>:
> +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 !
>>
>>
>>
>
>



-- 
Sébastien Bocahu
IT infrastructure manager

4, Rue Montrochet - 69002 - Lyon, France

+33 (0)437651704 - Phone
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