RE: [PATCH rdma-rc 0/8] Fixes for v5.3

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> -----Original Message-----
> From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
> Sent: Thursday, August 15, 2019 10:30 PM
> To: Leon Romanovsky <leon@xxxxxxxxxx>; Moni Shoua
> <monis@xxxxxxxxxxxx>
> Cc: Doug Ledford <dledford@xxxxxxxxxx>; Leon Romanovsky
> <leonro@xxxxxxxxxxxx>; RDMA mailing list <linux-rdma@xxxxxxxxxxxxxxx>;
> Guy Levi(SW) <guyle@xxxxxxxxxxxx>; Ido Kalir <idok@xxxxxxxxxxxx>; Majd
> Dibbiny <majd@xxxxxxxxxxxx>; Mark Zhang <markz@xxxxxxxxxxxx>
> Subject: Re: [PATCH rdma-rc 0/8] Fixes for v5.3
> 
> On Thu, Aug 15, 2019 at 11:38:26AM +0300, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
> >
> > Hi,
> >
> > This is a collection of new fixes for v5.3, everything here is fixing
> > kernel crash or visible bug with one exception: patch #5 "IB/mlx5:
> > Consolidate use_umr checks into single function". That patch is nice
> > to have improvement to implement rest of the series.
> >
> > Thanks
> >
> > Ido Kalir (1):
> >   IB/core: Fix NULL pointer dereference when bind QP to counter
> >
> > Jason Gunthorpe (1):
> >   RDMA/mlx5: Fix MR npages calculation for IB_ACCESS_HUGETLB
> >
> > Leon Romanovsky (2):
> >   RDMA/counters: Properly implement PID checks
> >   RDMA/restrack: Rewrite PID namespace check to be reliable
> >
> > Moni Shoua (4):
> >   IB/mlx5: Consolidate use_umr checks into single function
> >   IB/mlx5: Report and handle ODP support properly
> >   IB/mlx5: Fix MR re-registration flow to use UMR properly
> >   IB/mlx5: Block MR WR if UMR is not possible
> 
> I'm a little murky on what thes are fixing? Moni?

See original fixed patch.
Sometime the HW device disables some UMR abilities and hence driver should avoid UMR usage in some cases. This HW behavior can be seen today in Linux@windows environment with "untrusted VF".

> 
> Jason




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