Public bug reported:

Upstream backport [3] introduced a regression with ThunderX nodes (CRB-1S, 
CRB-2S) and our 10G switch (Extreme Networks x670 10GE L3).
We have opened a downstream bug report [1], where we temporarily bypassed this 
by pinning the kernel to 4.4.0-45.
I also tested 4.8 (multiple builds), 4.10 and 4.11-rc1 (vanilla); all are still 
affected by link training issues with our switch, with 4.11-rc1 not working at 
all and reporting more issues (logs attached in a different LP comment [2]).

I also confirmed that reverting the commit in questions fixes the issues
in our setup (tested on top of 4.10.0-13 linux-image-generic-hwe-edge
package from Xenial).

BR,
Alex

[1] https://jira.opnfv.org/browse/ARMBAND-168
[2] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1672521/comments/17
[3] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1630038

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1674837

Title:
  thunder nic: RX_PACKET_DIS fix regression with Extreme Networks switch

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