On Mon, Jan 08, 2018 at 12:05:57PM -0700, Logan Gunthorpe wrote:

Ok, so if we shouldn't touch the dma_map infrastructure how should the 
workaround to opt-out HFI and QIB look? I'm not that familiar with the RDMA 
code.

We can add a no_p2p quirk, I'm just not sure what the right place
for it is.  As said they device don't really mind P2P at the PCIe
level, it's just that their RDMA implementation is really strange.

So I'd be tempted to do it in RDMA.