Re: [PATCH] RDMA/rxe: For invalidate compare keys according to the MR access

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On Tue, Jul 05, 2022 at 11:28:59AM +0200, haris iqbal wrote:
> On Wed, Jun 29, 2022 at 8:48 PM Pearson, Robert B
> <robert.pearson2@xxxxxxx> wrote:
> >
> > > > > If the rkey's and lkeys are always the same why do we store them twice in the mr ?
> > > >
> > > > They are not always the same currently. If you request remote access they are the same if you don't rkey is set to zero.
> > > > You could, of course, check both the keys and the access bits but that is not the way it is written currently.
> >
> > > Storing the rkey instead of checking the flags seems like a weird obfuscation to me..
> >
> > > Jason
> >
> > One always has the choice to always just use the lkey and check the flags. But referring the rkey just uses one memory reference 😊
> 
> Have we reached a consensus here as to how to solve this?
> 
> This (and the issue created by dual map) has basically caused a
> regression in RTRS since the 5.15. And we would appreciate it a lot if
> the fix goes in and is backported.

I think your patch is close, it should just be tweaked a bit.

Jason



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