On Tue, Apr 06, 2021 at 09:13:12AM -0300, Jason Gunthorpe wrote: > So we broadly have two choice > 1) Diverge the kernel and user interfaces and make the RDMA drivers > special case all the kernel stuff to force > ACCESS_RELAXED_ORDERING when they are building MRs and processing > FMR WQE's > 2) Keep the two interfaces the same and push the > ACCESS_RELAXED_ORDERING to a couple of places in the ULPs so the > drivers see a consistent API > > They are both poor choices, but I think #2 has a greater chance of > everyone doing their parts correctly. No, 1 is the only sensible choice. The userspace verbs interface is a mess and should not inflict pain on the kernel in any way. We've moved away from a lot of the idiotic "Verbs API" concepts with things like how we handle the global lkey, the new CQ API and the RDMA R/W abstraction and that massively helped the kernel ecosystem.
