Re: [PATCH net] Revert "vxlan: fix tos value before xmit"

From: Hangbin Liu <redacted>
Date: Thu, 6 Aug 2020 10:52:41 +0800

The rough steps are setting vxlan tunnel on OVS. set inner packet tos to
1011 1010 (0xba) and outer vxlan to 1111 1100(0xfc). The outer packet's tos
should be 0xfe at latest as it inherit the inner ECN bit. But with RT_TOS(tos)
We actually got tos 0x1e as the first 3 bits are omitted.

Now here is detailed testing steps:

This explains why we need to revert the RT_TOS() change.

I'm asking what testing you did on the original change that added
RT_TOS(), which we reverted, and which didn't fix anything.

I want to know how we got into this situation in the first place,
adding a change that only added negative effects.

Thank you.