[FS#633] 802.1ad (QinQ) VLANs broken since kernel 4.3 in ramips mt7620

[LEDE Bugs]

The following task has a new comment added:

FS#633 - 802.1ad (QinQ) VLANs broken since kernel 4.3 in ramips mt7620
User who did this - rogerpueyo (rogerpueyo)

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====Update====
Capturing Ethernet traffic with Wireshark and analyzing it shows that TCP packets have wrong checksums:

** Checksum: 0xfb86 [incorrect, shoud be 0xa523](maybe caused by "TCP checksum offload"?)**

See attached Wireshark captures and screenshot.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=633#comment2171