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Date:	Wed, 4 Jan 2012 15:18:52 +0530
From:	Pratyush Anand <pratyush.anand@...il.com>
To:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Cc:	Pratyush ANAND <pratyush.anand@...com>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Deepak SIKRI <deepak.sikri@...com>,
	Bhavna YADAV <bhavna.yadav@...com>
Subject: Detected Hardware Unit Hang on Intel Wired Ethernet

Hi All,

I am trying to use PCIe based Intel PRO/1000 PT Server Adapter card on
an ARM Corterx A-9 based platform.
I am using linux 2.6.37.

I am trying to mount my rootfile system on NFS using interface of this card.

I see follwing issue while nfs mount
----------------------------------------------------------------------------------------------------------------------------------------------------------
IP-Config: Complete:
     device=eth0, addr=192.168.1.10, mask=255.255.255.0, gw=255.255.255.255,
     host=192.168.1.10, domain=, nis-domain=(none),
     bootserver=192.168.1.1, rootserver=192.168.1.1, rootpath=
NFS:1. attempt to mount rootVFS: Mounted root (nfs filesystem) on device 0:13.
Freeing init memory: 184K
nfs: server 192.168.1.1 not responding, still trying
e1000e 0000:03:00.0: eth0: Detected Hardware Unit Hang:
  TDH                  <40>
  TDT                  <43>
  next_to_use          <43>
  next_to_clean        <3f>
buffer_info[next_to_clean]:
  time_stamp           <ffff984a>
  next_to_watch        <40>
  jiffies              <ffff9948>
  next_to_watch.status <0>
MAC Status             <80383>
PHY Status             <792d>
PHY 1000BASE-T Status  <3800>
PHY Extended Status    <3000>
PCI Status             <4010>
e1000e 0000:03:00.0: eth0: Detected Hardware Unit Hang:
  TDH                  <40>
  TDT                  <43>
  next_to_use          <43>
  next_to_clean        <3f>
buffer_info[next_to_clean]:
  time_stamp           <ffff984a>
  next_to_watch        <40>
  jiffies              <ffff9a10>
  next_to_watch.status <0>
MAC Status             <80383>
PHY Status             <792d>
PHY 1000BASE-T Status  <3800>
PHY Extended Status    <3000>
PCI Status             <4010>
e1000e 0000:03:00.0: eth0: Detected Hardware Unit Hang:
  TDH                  <40>
  TDT                  <43>
  next_to_use          <43>
  next_to_clean        <3f>
buffer_info[next_to_clean]:
  time_stamp           <ffff984a>
  next_to_watch        <40>
  jiffies              <ffff9ba0>
  next_to_watch.status <0>
MAC Status             <80383>
PHY Status             <792d>
PHY 1000BASE-T Status  <3800>
PHY Extended Status    <3000>
PCI Status             <4010>
e1000e 0000:03:00.0: eth0: Detected Hardware Unit Hang:
  TDH                  <40>
  TDT                  <43>
  next_to_use          <43>
  next_to_clean        <3f>
buffer_info[next_to_clean]:
  time_stamp           <ffff984a>
  next_to_watch        <40>
  jiffies              <ffff9c68>
  next_to_watch.status <0>
MAC Status             <80383>
PHY Status             <792d>
PHY 1000BASE-T Status  <3800>
PHY Extended Status    <3000>
PCI Status             <4010>
------------[ cut here ]------------
WARNING: at /data/csd_sw/spear/drives_os/pratyusha/spear/kernel/linux-2.6/net/sched/sch_generic.c:258
dev_watchdog+0x168/0x280()
NETDEV WATCHDOG: eth0 (e1000e): transmit queue 0 timed out
Modules linked in:
Backtrace:
[<8003f9fc>] (dump_backtrace+0x0/0x10c) from [<803ede3c>] (dump_stack+0x18/0x1c)
 r6:804f3833 r5:00000102 r4:8e83dc18 r3:60000113
[<803ede24>] (dump_stack+0x0/0x1c) from [<8005e2b8>]
(warn_slowpath_common+0x54/0x6c)
[<8005e264>] (warn_slowpath_common+0x0/0x6c) from [<8005e374>]
(warn_slowpath_fmt+0x38/0x40)
 r8:00000001 r7:00000000 r6:807164c0 r5:8eaf01d4 r4:8eaf0000
r3:00000009
[<8005e33c>] (warn_slowpath_fmt+0x0/0x40) from [<8036d7bc>]
(dev_watchdog+0x168/0x280)
 r3:8eaf0000 r2:804f3889
[<8036d654>] (dev_watchdog+0x0/0x280) from [<80069680>]
(run_timer_softirq+0x158/0x210)
[<80069528>] (run_timer_softirq+0x0/0x210) from [<80063cb8>]
(__do_softirq+0xb8/0x160)
 r8:0000000a r7:00000100 r6:80525044 r5:00000141 r4:8e83c000
[<80063c00>] (__do_softirq+0x0/0x160) from [<80064144>] (irq_exit+0x4c/0x54)
[<800640f8>] (irq_exit+0x0/0x54) from [<80040e2c>] (ipi_timer+0x40/0x4c)
[<80040dec>] (ipi_timer+0x0/0x4c) from [<80036260>] (do_local_timer+0x5c/0x88)
 r4:800348b4 r3:00001179
[<80036204>] (do_local_timer+0x0/0x88) from [<8003b714>] (__irq_svc+0x34/0xc0)
Exception stack(0x8e83dd68 to 0x8e83ddb0)
dd60:                   8054d648 60000093 8054d640 60000013 00000206 00000001
dd80: 80585216 00000000 8054d5b8 8e83de3c 804ca994 8e83de1c 8e83dd88 8e83ddb0
dda0: 8005f0b0 8005f588 60000013 ffffffff
 r6:0000001d r5:fec80100 r4:ffffffff r3:60000013
[<8005f1f4>] (vprintk+0x0/0x3f0) from [<803edfe0>] (printk+0x24/0x2c)
[<803edfbc>] (printk+0x0/0x2c) from [<8020db74>] (__dev_printk+0x58/0x68)
 r3:8e886dc0 r2:8056e0fc r1:804b70c9 r0:804ca994
[<8020db1c>] (__dev_printk+0x0/0x68) from [<8020ddb0>] (dev_printk+0x34/0x3c)
 r6:00000040 r5:ffff984a r4:8eaf0360
[<8020dd7c>] (dev_printk+0x0/0x3c) from [<803589fc>] (__netdev_printk+0x4c/0x94)
 r3:8eaf0000 r2:804ca999
[<803589b0>] (__netdev_printk+0x0/0x94) from [<80358b58>] (netdev_err+0x3c/0x48)
 r4:8eaf0360
[<80358b1c>] (netdev_err+0x0/0x48) from [<8028cb34>]
(e1000_print_hw_hang+0x124/0x134)
 r3:00000043 r2:00000040 r1:804d85ab
[<8028ca10>] (e1000_print_hw_hang+0x0/0x134) from [<80072d6c>]
(process_one_work+0x1f0/0x324)
[<80072b7c>] (process_one_work+0x0/0x324) from [<800733a4>]
(worker_thread+0x1c0/0x300)
[<800731e4>] (worker_thread+0x0/0x300) from [<80076e04>] (kthread+0x90/0x98)
[<80076d74>] (kthread+0x0/0x98) from [<8006169c>] (do_exit+0x0/0x5f8)
 r6:8006169c r5:80076d74 r4:8e831ee0
---[ end trace ea1efd5a579b2b9e ]---
e1000e 0000:03:00.0: eth0: Reset adapter
e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
nfs: server 192.168.1.1 not responding, still trying
nfs: server 192.168.1.1 not responding, still trying
----------------------------------------------------------------------------------------------------------------------------------------------------------

However, If I pass pci=nomsi in bootargs then it works fine.

I see similar issue discussed earlier at following link:
http://sourceforge.net/tracker/index.php?func=detail&aid=2896629&group_id=42302&atid=447449

Reading above link, it seems that bug should have been resolved in linux 2.6.32.
But I still see it in 2.6.37.
Any suggestion to resolve?

Regards
Pratyush
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