netdev - Re: bnx2 cards intermittantly going offline

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Date:	Thu, 13 Sep 2012 13:30:20 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"Sven Ulland" <sveniu@...ra.com>
cc:	netdev@...r.kernel.org, "Marc A. Donges" <marc.donges@...d1.de>
Subject: Re: bnx2 cards intermittantly going offline


On Thu, 2012-09-13 at 17:45 +0200, Sven Ulland wrote:
> On 09/13/2012 03:51 PM, Marc A. Donges wrote:
> > After 55 days of operation the machine (A) suddenly was no longer
> > reachable via network. Strangely, a second machine (B) that should
> > take over the IP addresses (keepalived) did not take over. Only
> > after shutting the switchport to which A is attached did B take
> > over.

The rx_ftq_discards problem is a firmware problem.  FTQ discards mean
that the firmware is no longer running and the packets are dropped at
the FTQ.  This is likely fixed in:

commit 22fa159d37efbfe781bbb99279efe83f58b87d29
Author: Michael Chan <mchan@...adcom.com>
Date:   Mon Oct 11 16:12:00 2010 -0700

    bnx2: Update firmware to 6.0.x.


> 
> Hi. We've had the same symptom with our BCM5709S [14e4:163a] on
> Debian. Like you, we were on stable's 2.6.32-41squeeze2. Google led us
> to many similar issues [1,2,3]. They concluded with the fix being in
> mainline commit c441b8d2 [4]: "bnx2: Fix lost MSI-X problem on 5709
> NICs".

This is a different problem and will not result in FTQ discards.

> 
> Broadcom: Can you publish a tool that decodes ethtool -d dumps to make
> debugging easier, or do you deem it no longer necessary with the the
> register dump commits in 555069da?

The register dump during tx timeout is now quite comprehensive.

> 
> Now, Debian's 2.6.32-41squeeze2 is based on longterm release 2.6.32.54
> [5]. That version includes commit 0b7817ed [6], which is a backport of
> the already mentioned mainline commit c441b8d2.
> 
> So we tried digging further and applying some seemingly relevant
> commits [7,8] to our 2.6.32, but without any change in behaviour. Our
> temporary fix was to run 'ethtool -t ethX' to reset the device every
> time it locked up.
> 
> This dragged on with various builds, until we ended up on mainline
> 2.6.38 where we no longer saw any symptoms. I don't know in which
> kernel version it was fixed, but we ended up on that one, sort of by
> chance. Unfortunately, it had severe issues with kswapd memory
> compaction causing CPU soft lockups [9], so we went straight to
> squeeze-backports' 3.2.23-1~bpo60+2. We've been happy since then.
> 
> > We have five pairs of basically identical machines performing the
> > same task (each pair for one site). The error has not occured with
> > any other one, but this site is the busiest:
> 
> We also saw the issue only at a site with generally higher load
> compared to other sites.
> 
> I'd love to know exactly which commit fixed the issue, but it's fairly
> tricky to reproduce the issue, and the bisect count is fairly high (it
> need not be a specific fix for bnx2).

If you see the same FTQ discards, please try that firmware commit
mentioned above.  Thanks.

> 
> sven
> 
> 
> [1]: bnx2 driver crashes under random circumstances
> https://bugzilla.redhat.com/show_bug.cgi?id=520888
> 
> [2]: Access denied. Come on, Red Hat!
> https://bugzilla.redhat.com/show_bug.cgi?id=511368
> 
> [3]: NIC doesn't register packets [rhel-5.5.z]
> https://bugzilla.redhat.com/show_bug.cgi?id=587799
> 
> [4]: bnx2: Fix lost MSI-X problem on 5709 NICs.
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=object;h=c441b8d2cb2194b05550a558d6d95d8944e56a84
> 
> [5]: Debian Changelog linux-2.6 (2.6.32-45)
> http://packages.debian.org/changelogs/pool/main/l/linux-2.6/linux-2.6_2.6.32-45/changelog#version2.6.32-41
> 
> [6]: bnx2: Fix lost MSI-X problem on 5709 NICs.
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=commit;h=0b7817edda5e44e5fa769645bd1220f5e7b0beb5
> 
> [7]: bnx2: reset_task is crashing the kernel. Fixing it.
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4529819c45161e4a119134f56ef504e69420bc98
> 
> [8]: bnx2: fixing a timout error due not refreshing TX timers correctly
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e6bf95ffa8d6f8f4b7ee33ea01490d95b0bbeb6e
> 
> [9]: [PATCH] remove compaction from kswapd
> http://thread.gmane.org/gmane.linux.kernel.mm/58962
> https://lkml.org/lkml/2011/3/25/664
> 
> 


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