[22.04 FEAT] HSCI: Multi-MAC Support (kernel part)

[bugproxy]

Enhance HSCI (HiperSockets Converged Interface) with multi-MAC support and provide the corresponding tool for exploitation.

Business value: Provide improved capabilites for KVM setups on IBM Z, enhance z/OS interoperation

The initial version of HSCI supports single-MAC setups only, where only a single MAC can be registered for the HSCI. This will not work with regular Open vSwitch or MacVTap setups as used by our KVM customers, as both try to register add'l MACs for the KVM guests. And that will also precent z/OS <-> KVM co-location cases from working.
This line item will overcome this restriction. If possible, the tooling should exploit multi-MAC transparently (i.e. no add'l switch required - it's enabled all the time).

Affected components:
kernel >=5.14

Business value:
z/OS Co-location.

Backports need to be provided if possible for 21.10.

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2021-08-04 11:43 EDT-------
Feature will not make it in time for Impish/21.10, therefore moving to U22.04

[bugproxy (bugproxy)]

------- Comment From <email address hidden> 2022-02-12 23:13 EDT-------
The code of this feature (kernel part) is upstream in kernel 5.15 with:
f7936b7b2663 s390/qeth: Update MACs of LEARNING_SYNC device
4e20e73e631a s390/qeth: Switchdev event handler
60bb1089467d s390/qeth: Register switchdev event handler

[Frank Heimes (fheimes)]

I've lokked up the three commits and can confirm they are all in - since kernel Ubuntu-5.15.0-15.15, hence closing with Fix Released.