Date:	Tue, 10 Jul 2012 19:02:29 +0000
From:	"Dave, Tushar N" <tushar.n.dave@...el.com>
To:	Joe Jin <joe.jin@...cle.com>
CC:	"e1000-devel@...ts.sf.net" <e1000-devel@...ts.sf.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Dave, Tushar N" <tushar.n.dave@...el.com>
Subject: RE: 82571EB: Detected Hardware Unit Hang

>-----Original Message-----
>From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
>On Behalf Of Joe Jin
>Sent: Tuesday, July 10, 2012 12:40 AM
>To: Joe Jin
>Cc: e1000-devel@...ts.sf.net; netdev@...r.kernel.org; linux-
>kernel@...r.kernel.org
>Subject: Re: 82571EB: Detected Hardware Unit Hang
>
>When I debug the driver I found before Detected HW hang, driver unable to
>clean and reclaim the resources:
>
>1457         while ((eop_desc->upper.data &
>cpu_to_le32(E1000_TXD_STAT_DD)) &&  <== at here upper.data always is 0x300
>1458                (count < tx_ring->count)) {
>     <--- snip --->
>1487         }
>
>
>I checked all driver codes I did not found anywhere will set the
>upper.data with E1000_TXD_STAT_DD, I guess upper.data be set by hardware?

Yes upper.data (part of it is STATUS byte) is set by HW. Basically driver checks E1000_TXD_STAT_DD (Descriptor Done) bit. If this bit is set that means HW has processed that descriptor and driver can now clean that descriptor.
With value 0x300 , DD bit is not set. That means HW has not processed that descriptor.

How fast does tx hang reproduce? I suggest you to enable debug code in driver so when tx hang occurs it will dump the HW desc ring info into kernel log.
You can run "ethtool -s ethx msglvl 0x2c00" to enable debug.
Once tx hang occurs please send me the full dmesg log.

Does tx hang occur with in-kernel e1000e driver too?

Thanks.

-Tushar


>If OS is 32bit system, what which happen?


>
>Thanks in advance,
>Joe
>
>On 07/09/12 16:51, Joe Jin wrote:
>> Hi list,
>>
>> I'm seeing a Unit Hang even with the latest e1000e driver 2.0.0 when
>> doing scp test. this issue is easy do reproduced on SUN FIRE X2270 M2,
>> just copy a big file (>500M) from another server will hit it at once.
>>
>> Would you please help on this?
>>
>> device info:
>> # lspci -s 05:00.0
>> 05:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit
>> Ethernet Controller (Copper) (rev 06)
>>
>> # lspci -s 05:00.0 -n
>> 05:00.0 0200: 8086:10bc (rev 06)
>>
>> # ethtool -i eth0
>> driver: e1000e
>> version: 2.0.0-NAPI
>> firmware-version: 5.10-2
>> bus-info: 0000:05:00.0
>>
>> # ethtool -k eth0
>> Offload parameters for eth0:
>> rx-checksumming: on
>> tx-checksumming: on
>> scatter-gather: on
>> tcp segmentation offload: on
>> udp fragmentation offload: off
>> generic segmentation offload: on
>> generic-receive-offload: on
>>
>> kernel log:
>> -----------
>> e1000e 0000:05:00.0: eth0: Detected Hardware Unit Hang:
>>   TDH                  <6c>
>>   TDT                  <81>
>>   next_to_use          <81>
>>   next_to_clean        <6b>
>> buffer_info[next_to_clean]:
>>   time_stamp           <fffc7a23>
>>   next_to_watch        <71>
>>   jiffies              <fffc8c0c>
>>   next_to_watch.status <0>
>> MAC Status             <80387>
>> PHY Status             <792d>
>> PHY 1000BASE-T Status  <3c00>
>> PHY Extended Status    <3000>
>> PCI Status             <10>
>> e1000e 0000:05:00.0: eth0: Detected Hardware Unit Hang:
>>   TDH                  <6c>
>>   TDT                  <81>
>>   next_to_use          <81>
>>   next_to_clean        <6b>
>> buffer_info[next_to_clean]:
>>   time_stamp           <fffc7a23>
>>   next_to_watch        <71>
>>   jiffies              <fffc9bac>
>>   next_to_watch.status <0>
>> MAC Status             <80387>
>> PHY Status             <792d>
>> PHY 1000BASE-T Status  <3c00>
>> PHY Extended Status    <3000>
>> PCI Status             <10>
>> ------------[ cut here ]------------
>> WARNING: at net/sched/sch_generic.c:255 dev_watchdog+0x225/0x230()
>> Hardware name: SUN FIRE X2270 M2 NETDEV WATCHDOG: eth0 (e1000e):
>> transmit queue 0 timed out Modules linked in: autofs4 hidp rfcomm
>> bluetooth rfkill lockd sunrpc cpufreq_ondemand acpi_cpufreq mperf
>> be2iscsi iscsi_boot_sysfs ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad
>> ib_core ib_addr iscsi_tcp bnx2i cnic uio ipv6 cxgb3i libcxgbi cxgb3
>> mdio libiscsi_tcp libiscsi scsi_transport_iscsi video sbs sbshc
>> acpi_pad acpi_ipmi ipmi_msghandler parport_pc lp parport e1000e(U)
>> snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device
>> igb snd_pcm_oss serio_raw snd_mixer_oss snd_pcm tpm_infineon snd_timer
>> snd soundcore snd_page_alloc i2c_i801 iTCO_wdt i2c_core pcspkr
>> i7core_edac iTCO_vendor_support ioatdma ghes dca edac_core hed
>> dm_snapshot dm_zero dm_mirror dm_region_hash dm_log dm_mod usb_storage
>> sd_mod crc_t10dif sg ahci libahci ext3 jbd mbcache [last unloaded:
>> microcode]
>> Pid: 0, comm: swapper Not tainted 2.6.39-200.24.1.el5uek #1 Call
>> Trace:
>>  [<c07d9ac5>] ? dev_watchdog+0x225/0x230  [<c045ba61>]
>> warn_slowpath_common+0x81/0xa0  [<c07d9ac5>] ?
>> dev_watchdog+0x225/0x230  [<c045bb23>] warn_slowpath_fmt+0x33/0x40
>> [<c07d9ac5>] dev_watchdog+0x225/0x230  [<c07d98a0>] ?
>> dev_activate+0xb0/0xb0  [<c0468e82>] call_timer_fn+0x32/0xf0
>> [<c04bceb0>] ? rcu_check_callbacks+0x80/0x80  [<c046a76d>]
>> run_timer_softirq+0xed/0x1b0  [<c07d98a0>] ? dev_activate+0xb0/0xb0
>> [<c0461a81>] __do_softirq+0x91/0x1a0  [<c04619f0>] ?
>> local_bh_enable+0x80/0x80  <IRQ>  [<c0462295>] ? irq_exit+0x95/0xa0
>> [<c087f8b8>] ? smp_apic_timer_interrupt+0x38/0x42
>>  [<c08784f5>] ? apic_timer_interrupt+0x31/0x38  [<c046007b>] ?
>> do_exit+0x11b/0x370  [<c065eae4>] ? intel_idle+0xa4/0x100
>> [<c078d9b9>] ? cpuidle_idle_call+0xb9/0x1e0  [<c0411d77>] ?
>> cpu_idle+0x97/0xd0  [<c085cbbd>] ? rest_init+0x5d/0x70  [<c0b07a7a>] ?
>> start_kernel+0x28a/0x340  [<c0b074b0>] ? obsolete_checksetup+0xb0/0xb0
>> [<c0b070a4>] ? i386_start_kernel+0x64/0xb0 ---[ end trace
>> 5502b55cd4d4e5cb ]--- e1000e 0000:05:00.0: eth0: Reset adapter
>> e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
>>
>> Thanks,
>> Joe
>>
>
>
>--
>Oracle <http://www.oracle.com>
>Joe Jin | Software Development Senior Manager | +8610.6106.5624 ORACLE |
>Linux and Virtualization No. 24 Zhongguancun Software Park, Haidian
>District | 100193 Beijing
>
>
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