Re: [PATCH] RDMA/rxe: Pass a pointer to virt_to_page()

Bob Pearson
2023-03-30T02:45:51Z

On 3/29/23 18:16, Jason Gunthorpe wrote:
> On Wed, Mar 29, 2023 at 04:28:08PM +0200, Linus Walleij wrote:
>
>> I'm a bit puzzled: could the above code (which exist in
>> three instances in the driver) even work as it is? Or is it not used?
>> Or is there some failover from DMA to something else that is constantly
>> happening?
>
> The physical address dma type IB_MR_TYPE_DMA is rarely used and maybe
> nobody ever tested it, at least in a configuration where kva != pa
>
> Then again, maybe I got it wrong and it is still a kva in this case
> because it is still ultimately DMA mapped when using IB_MR_TYPE_DMA?
>
> Bob?
>
> Jason

In the amd64 environment I use to dev and test there is no difference AFAIK.
I have to go on faith that other platforms work but have very little experience.

Bob