netdev - RE: e1000e "Detected Tx Unit Hang"

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Date:	Thu, 10 Jul 2008 14:13:25 -0700
From:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
To:	"Felix Radensky" <felix@...edded-sol.com>, <netdev@...r.kernel.org>
Subject: RE: e1000e "Detected Tx Unit Hang"

Felix Radensky wrote:
> Hi, Jesse
> 
> I can confirm that I'm also getting these errors with 2.6.26-rc8 on
> PowerPC platform (AMCC 460EX CPU). The Intel adapter is (as reported
> by lspci -vv) 

Interesting, I haven't heard back from Herbert, but thanks for the
reply.

are you getting the NETDEV WATCHDOG messages in your log?  does ethtool
-S show any tx_timeout?

can you try applying a patch similar to
https://sourceforge.net/tracker/download.php?group_id=42302&atid=447449&
file_id=283326&aid=2007017

aka http://tinyurl.com/5vl5g4


 
> 41:00.0 Ethernet controller: Intel Corporation 82572EI Gigabit
> Ethernet Controller (Copper) (rev 06)
>         Subsystem: Intel Corporation PRO/1000 PT Desktop Adapter

x1 PCIe adapter

> 
> Some relevant output from dmesg:
> 
> e1000e: Intel(R) PRO/1000 Network Driver - 0.3.3.3-k2
> e1000e: Copyright (c) 1999-2008 Intel Corporation.
> e1000e 0000:41:00.0: enabling device (0006 -> 0007)
> eth2: (PCI Express:2.5GB/s:Width x1) 00:1b:21:1e:2d:2a
> eth2: Intel(R) PRO/1000 Network Connection
> eth2: MAC: 1, PHY: 4, PBA No: d50854-003
> eth2: Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
> eth2: 10/100 speed: disabling TSO
> 
> I can reliably reproduce the  problem  by running
> 
> dd=/dev/zero of=/mnt/1M bs=1024 count=1024
> 
> where /mnt is mounted over NFS  with the following options (default
> ones)
>
rw,vers=3,rsize=32768,wsize=32768,namlen=255,hard,nointr,nolock,proto=ud
p,timeo=7,retrans=3,sec=sys,mountproto=udp,addr
> 
> Below is register dump produced by patched driver.
> 
> eth2: Detected Tx Unit Hang:
>   TDH                  <25>
>   TDT                  <25>

Hardware completed all the packets, but no writebacks made it back to
main memory.

> TX Desc ring0 dump
> Tl[0x000]    0000000000000000 0000000000000000 000000001D734802 0022
> 2 00000000FFFFD0FE 00000000 NTC

Ewww, even worse, it seems that something zeroed out the memory in the
tx descriptor ring.  I strongly suspect something bad at your
system/chipset level. 


> Tl[0x001]    0000000000000000 0000000000000000 0000000015FE2A84 057C
> 1 00000000FFFFD0FE 00000000
> Tl[0x002]    0000000000000000 0000000000000000 0000000015FA1000 004C
> 2 00000000FFFFD0FE dd739f00
> Tl[0x003]    0000000000000000 0000000000000000 000000001D734A02 0022
> 4 00000000FFFFD0FE 00000000
> Tl[0x004]    0000000000000000 0000000000000000 0000000015FA104C 05C8
> 4 00000000FFFFD0FE dd739c80
> Tl[0x005]    0000000000000000 0000000000000000 000000001D734C02 0022
> 6 00000000FFFFD0FE 00000000
> Tl[0x006]    0000000000000000 0000000000000000 0000000015FA1614 05C8
> 6 00000000FFFFD0FE dd739280
> Tl[0x007]    0000000000000000 0000000000000000 000000001D734E02 0022
> 9 00000000FFFFD0FE 00000000
> Tl[0x008]    0000000000000000 0000000000000000 0000000015FA1BDC 0424
> 8 00000000FFFFD0FE 00000000
> Tl[0x009]    0000000000000000 0000000000000000 0000000015EC6000 01A4
> 9 00000000FFFFD0FE dd7390a0
> Tl[0x00A]    0000000000000000 0000000000000000 000000001D73A002 0022
> B 00000000FFFFD0FE 00000000
> Tl[0x00B]    0000000000000000 0000000000000000 0000000015EC61A4 05C8
> B 00000000FFFFD0FE dd739e60
> Tl[0x00C]    000000001D73A202 0000000002000022 000000001D73A202 0022
> D 00000000FFFFD0FE 00000000

Either the driver is half done cleaning up, which doesn't seem likely
due to the driver not ZEROING all the first two 64 bit columns, but the
last column which contains an skb pointer still indicates cleanup hasn't
completed.

Does this card work at all in your system?

Jesse
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