linux-kernel - Re: tg3 crashes under high load, when using 100Mbits

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Date:   Sat, 14 Apr 2018 23:47:56 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Satish Baddipadige <satish.baddipadige@...adcom.com>
Cc:     Siva Reddy Kallam <siva.kallam@...adcom.com>,
        Prashant Sreedharan <prashant@...adcom.com>,
        Michael Chan <mchan@...adcom.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stanley Hsiao <stanley.hsiao@...onical.com>,
        Tim Chen <tim.chen119@...onical.com>
Subject: Re: tg3 crashes under high load, when using 100Mbits

Hi Satish,

> On 2018Mar21, at 00:57, Kai-Heng Feng <kai.heng.feng@...onical.com> wrote:
> 
> Satish Baddipadige <satish.baddipadige@...adcom.com> wrote:
> 
>> On Thu, Feb 15, 2018 at 7:37 PM, Siva Reddy Kallam
>> <siva.kallam@...adcom.com> wrote:
>>> On Mon, Feb 12, 2018 at 10:59 AM, Siva Reddy Kallam
>>> <siva.kallam@...adcom.com> wrote:
>>>> On Fri, Feb 9, 2018 at 10:41 AM, Kai Heng Feng
>>>> <kai.heng.feng@...onical.com> wrote:
>>>>> Hi Broadcom folks,
>>>>> 
>>>>> We are now enabling a new platform with tg3 nic, unfortunately we observed
>>>>> the bug [1] that dated back to 2015.
>>>>> I tried commit 4419bb1cedcd ("tg3: Add workaround to restrict 5762 MRRS to
>>>>> 2048”) but it does’t work.
>>>>> 
>>>>> Do you have any idea how to solve the issue?
>>>>> 
>>>>> [1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1447664
>>>>> 
>>>>> Kai-Heng
>>>> Thank you for reporting. We will check and update you.
>>> With link aware mode, the clock speed could be slow and boot code does not
>>> complete within the expected time with lower link speeds. Need to override
>>> and the clock in driver. We are checking the feasibility of adding
>>> this in driver or firmware.
>> 
>> Hi Kai-Heng,
>> 
>> Can you please test the attached patch?
> 
> I built a kernel and asked affected users to try.

Users reported that the crash still happens with the patch.

Kai-Heng

> 
> Thanks for your work.
> 
> Kai-Heng
> 
>> 
>> Thanks,
>> Satish
>> <tg3_5762_clock_override.patch>