Re: [for-next PATCH v5 03/11] RDMA: Extend RDMA kernel verbs ABI to support flush

[Jason Gunthorpe]

On Thu, Sep 29, 2022 at 02:21:24PM +0800, Li Zhijian wrote:

> we can see, IBV_ACCESS_REMOTE_ATOMIC and IBV_ACCESS_ON_DEMAND are
> tagged "if supported" . but currently kernel just returns EINVAL
> when user registers a MR with IB_ACCESS_ON_DEMAND to RXE.
>
> I wonder we should return -EOPNOTSUPP if the device doesn't support requested capabilities

Yes, unsupported combinations of access flags should trigger
EOPNOTSUPP

Jason