Re: [PATCH-for-9.1 v2 2/3] migration: Remove RDMA protocol handling

[Peter Xu]

On Wed, Apr 10, 2024 at 02:28:59AM +0000, Zhijian Li (Fujitsu) via wrote:
> 
> 
> on 4/10/2024 3:46 AM, Peter Xu wrote:
> 
> >> Is there document/link about the unittest/CI for migration tests, Why
> >> are those tests missing?
> >> Is it hard or very special to set up an environment for that? maybe we
> >> can help in this regards.
> > See tests/qtest/migration-test.c.  We put most of our migration tests
> > there and that's covered in CI.
> >
> > I think one major issue is CI systems don't normally have rdma devices.
> > Can rdma migration test be carried out without a real hardware?
> 
> Yeah,  RXE aka. SOFT-RoCE is able to emulate the RDMA, for example
> $ sudo rdma link add rxe_eth0 type rxe netdev eth0  # on host
> then we can get a new RDMA interface "rxe_eth0".
> This new RDMA interface is able to do the QEMU RDMA migration.
> 
> Also, the loopback(lo) device is able to emulate the RDMA interface 
> "rxe_lo", however when
> I tried(years ago) to do RDMA migration over this 
> interface(rdma:127.0.0.1:3333) , it got something wrong.
> So i gave up enabling the RDMA migration qtest at that time.

Thanks, Zhijian.

I'm not sure adding an emu-link for rdma is doable for CI systems, though.
Maybe someone more familiar with how CI works can chim in.

-- 
Peter Xu