netdev - Re: e1000e tx queue timeout in 3.3.0 (bisected to BQL support for e1000e)

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Date:	Fri, 20 Apr 2012 14:21:31 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	John Fastabend <john.r.fastabend@...el.com>
Cc:	Ben Greear <greearb@...delatech.com>,
	netdev <netdev@...r.kernel.org>,
	e1000-devel list <e1000-devel@...ts.sourceforge.net>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: e1000e tx queue timeout in 3.3.0 (bisected to BQL support for e1000e)

Thanks John for pointers to those.  Ben, are you running a kernel with
these patches?

Tom

>
> Tom, did you see these two patches? Maybe this is resolved by
> the second patch.
>
> We needed these to fixup ixgbe and igb (i didn't test e1000e)
> looks like we might want to push these at stable. I don't
> believe they are in 3.3.
>
> commit b37c0fbe3f6dfba1f8ad2aed47fb40578a254635
> Author: Alexander Duyck <alexander.h.duyck@...el.com>
> Date:   Tue Feb 7 02:29:06 2012 +0000
>
>    net: Add memory barriers to prevent possible race in byte queue limits
>
>    This change adds a memory barrier to the byte queue limit code to address a
>    possible race as has been seen in the past with the
>    netif_stop_queue/netif_wake_queue logic.
>
>    Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
>    Tested-by: Stephen Ko <stephen.s.ko@...el.com>
>    Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
>
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b37c0fbe3f6dfba1f8ad2aed47fb40578a254635
>
>
> commit 5c4903549c05bbb373479e0ce2992573c120654a
> Author: Alexander Duyck <alexander.h.duyck@...el.com>
> Date:   Tue Feb 7 02:29:01 2012 +0000
>
>    net: Fix issue with netdev_tx_reset_queue not resetting queue from XOFF state
>
>    We are seeing dev_watchdog hangs on several drivers.  I suspect this is due
>    to the __QUEUE_STATE_STACK_XOFF bit being set prior to a reset for link
>    change, and then not being cleared by netdev_tx_reset_queue.  This change
>    corrects that.
>
>    In addition we were seeing dev_watchdog hangs on igb after running the
>    ethtool tests.  We found this to be due to the fact that the ethtool test
>    runs the same logic as ndo_start_xmit, but we were never clearing the XOFF
>    flag since the loopback test in ethtool does not do byte queue accounting.
>
>    Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
>    Tested-by: Stephen Ko <stephen.s.ko@...el.com>
>    Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5c4903549c05bbb373479e0ce2992573c120654a
>
>
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