Thanks. Let me know how the testing otherwise goes. If only Intel NICs are
supporting QinQ, then it can't be that widely used a feature yet, so we may
be able to tweak things a bit if it diverges from what is expected.
Yeah, there seems to be fairly broad support for VLAN strip, but much less for QinQ strip. So, we can verify "correct" VLAN stripping behavior given the various packet profiles we discussed previously like double vlan, vlan + qinq, single qinq etc.
For QinQ strip like Dean said, most PMDs dont support this currently, with Intel PMDs being an exception among the NICs we have at UNH. We took a look at the DPDK networking drivers support table which reflects this (see the QinQ offload row).
https://doc.dpdk.org/guides/nics/overview.html
So, it looks like there are a few (ZTE DXDH is an example) that are also supporting QinQ Offload, but not many right now.
I also wonder if the definition of expected behaviour is preventing other
NICs from implementing the feature?
Can you also check with VLAN stripping enabled? My biggest issue with the
behaviour description of QinQ strip only removing outer tag is that it
implies for QinQ traffoc that VLAN strip alone should strip inner tag without
removing outer.
Sure, we can check this case. across the NICs at UNH. I have a sync wth Dean tomorrow morning for this, at the end of which we'll share back to you what we have.
That doesn't make sense to me - and I'm not sure if NIC
hardware supports such features of removing inner headers while leaving
outer.
/Bruce