netdev - Re: Latitude 5495's tg3 hangs under heavy load

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Date:   Wed, 9 Jan 2019 13:42:54 +0800
From:   Kai Heng Feng <kai.heng.feng@...onical.com>
To:     Siva Reddy Kallam <siva.kallam@...adcom.com>
Cc:     Prashant Sreedharan <prashant@...adcom.com>,
        Michael Chan <mchan@...adcom.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Chih-Hsyuan Ho <chih.ho@...onical.com>
Subject: Re: Latitude 5495's tg3 hangs under heavy load



> On Jan 7, 2019, at 5:12 PM, Siva Reddy Kallam <siva.kallam@...adcom.com> wrote:
> 
> On Mon, Jan 7, 2019 at 11:34 AM Kai Heng Feng
> <kai.heng.feng@...onical.com> wrote:
>> 
>> Hi tg3 folks,
>> 
>> Any idea how to solve the bug?
>> 
>> Kai-Heng
> Hi,
> Can you share Register dump(ethtool -d)?

`ethtool -d` before freeze:
https://pastebin.com/MSkJzhcv

`ethtool -d` after freeze:
https://pastebin.com/dQj8mLsN

> Is ifconfig down/up bringing back interface?

Yes. And seems like network works fine afterward.

`ethtool -d` after down/up:
https://pastebin.com/vL1gCC2n

Kai-Heng

> 
>> 
>>> On Dec 7, 2018, at 17:27, Kai Heng Feng <kai.heng.feng@...onical.com> wrote:
>>> 
>>> Hi tg3 maintainers,
>>> 
>>> I’ve encountered network freeze when using tg3 in gigabits net.
>>> 
>>> The issue can be easily reproduced when using scp to transfer files in local network.
>>> 
>>> The symptom is pretty similar to what this commit is trying to solve:
>>> commit 3a498606bb04af603a46ebde8296040b2de350d1
>>> Author: Sanjeev Bansal <sanjeevb.bansal@...adcom.com>
>>> Date:   Mon Jul 16 11:13:32 2018 +0530
>>> 
>>>   tg3: Add higher cpu clock for 5762.
>>> 
>>>   This patch has fix for TX timeout while running bi-directional
>>>   traffic with 100 Mbps using 5762.
>>> 
>>> But reverting this commit doesn’t help.
>>> 
>>> Latitude 5495 is a AMD Raven Ridge platform, not sure if this matters.
>>> 
>>> Here’s the lspci for this device:
>>> 03:00.0 Ethernet controller [0200]: Broadcom Inc. and subsidiaries NetXtreme BCM5762 Gigabit Ethernet PCIe [14e4:1687] (rev 10)
>>>       Subsystem: Dell NetXtreme BCM5762 Gigabit Ethernet PCIe [1028:0814]
>>>       Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
>>>       Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>>>       Latency: 0
>>>       Interrupt: pin A routed to IRQ 16
>>>       Region 0: Memory at e0220000 (64-bit, prefetchable) [size=64K]
>>>       Region 2: Memory at e0210000 (64-bit, prefetchable) [size=64K]
>>>       Region 4: Memory at e0200000 (64-bit, prefetchable) [size=64K]
>>>       Capabilities: [48] Power Management version 3
>>>               Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
>>>               Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=1 PME-
>>>       Capabilities: [50] Vital Product Data
>>>               Product Name: Broadcom NetXtreme Gigabit Ethernet Controller
>>>               Read-only fields:
>>>                       [PN] Part number: BCM95762
>>>                       [EC] Engineering changes: 106679-15
>>>                       [SN] Serial number: 0123456789
>>>                       [MN] Manufacture ID: 31 34 65 34
>>>                       [RV] Reserved: checksum good, 28 byte(s) reserved
>>>               Read/write fields:
>>>                       [YA] Asset tag: XYZ01234567
>>>                       [RW] Read-write area: 107 byte(s) free
>>>               End
>>>       Capabilities: [58] MSI: Enable- Count=1/8 Maskable- 64bit+
>>>               Address: 0000000000000000  Data: 0000
>>>       Capabilities: [a0] MSI-X: Enable+ Count=6 Masked-
>>>               Vector table: BAR=4 offset=00000000
>>>               PBA: BAR=2 offset=00000120
>>>       Capabilities: [ac] Express (v2) Endpoint, MSI 00
>>>               DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 <64us
>>>                       ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 0.000W
>>>               DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
>>>                       RlxdOrd- ExtTag- PhantFunc- AuxPwr+ NoSnoop- FLReset-
>>>                       MaxPayload 128 bytes, MaxReadReq 4096 bytes
>>>               DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
>>>               LnkCap: Port #0, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <2us, L1 <64us
>>>                       ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
>>>               LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
>>>                       ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
>>>               LnkSta: Speed 5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
>>>               DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, LTR+, OBFF Via WAKE#
>>>               DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, OBFF Disabled
>>>               LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
>>>                        Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
>>>                        Compliance De-emphasis: -6dB
>>>               LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
>>>                        EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
>>>       Capabilities: [100 v1] Advanced Error Reporting
>>>               UESta:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
>>>               UEMsk:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
>>>               UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
>>>               CESta:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
>>>               CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
>>>               AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
>>>       Capabilities: [13c v1] Device Serial Number 00-00-a4-4c-c8-5b-65-74
>>>       Capabilities: [150 v1] Power Budgeting <?>
>>>       Capabilities: [160 v1] Virtual Channel
>>>               Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
>>>               Arb:    Fixed- WRR32- WRR64- WRR128-
>>>               Ctrl:   ArbSelect=Fixed
>>>               Status: InProgress-
>>>               VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
>>>                       Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
>>>                       Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
>>>                       Status: NegoPending- InProgress-
>>>       Capabilities: [1b0 v1] Latency Tolerance Reporting
>>>               Max snoop latency: 1048576ns
>>>               Max no snoop latency: 1048576ns
>>>       Capabilities: [230 v1] Transaction Processing Hints
>>>               Interrupt vector mode supported
>>>               Steering table in MSI-X table
>>>       Kernel driver in use: tg3
>>>       Kernel modules: tg3
>>> 
>>> Please let me know if you need more information.
>>> 
>>> Kai-Heng
>>