tg3 crashes under high load, when using 100Mbits

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