[PATCH 0/1][SRU][H/OEM-5.13/OEM-5.14/U] UBUNTU: SAUCE: Fix invalid MAC address after hotplug tbt dock

[Aaron Ma]

On 9/8/21 8:06 PM, Tim Gardner wrote:
> 
> Ick. It seems like there ought to be a more deterministic way to note when the MAC address has been copied. Why not a loop that does an msleep(1) until the MAC is address is updated or 600 msec elapses ?

The MAC address of dock will read out at first, after 600 msec the MAC in BIOS will be updated.
Driver doesn't know which one is the right MAC address. This allows enough time for hardware to update the

MAC address.

Aaron

> 
> On 9/8/21 2:49 AM, Aaron Ma wrote:
>> BugLink: https://bugs.launchpad.net/bugs/1942999
>>
>> SRU justification:
>>
>> [Impact]
>> igc driver can not connect to network after re-plugin thunderbolt dock
>> when
>> MAC passthrough enabled in BIOS.
>>
>> [Fix]
>> Wait for the MAC copy of BIOS when enabled MAC passthrough.
>> Intel engineer wants a different solution and promise to discuss with
>> firmware engineer.
>> Due to the schedule, made this as a short term solution to fix the
>> issue, and wait for the other
>> fix from Intel.
>>
>> [Test]
>> Verified on hardware, after hotplug the thunderbolt cable,
>> Ethernet works fine.
>>
>> [Where problems could occur]
>> It may break the igc driver.
>>
>> Aaron Ma (1):
>>    UBUNTU: SAUCE: igc: wait for the MAC copy when enabled MAC passthrough
>>
>>   drivers/net/ethernet/intel/igc/igc_main.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>