Re: [PATCH for-rc v4 0/5] RDMA/rxe: Various bug fixes.

[Jason Gunthorpe <jgg@nvidia.com>]

On Thu, Sep 23, 2021 at 02:49:54PM -0400, Olga Kornievskaia wrote:
> On Tue, Sep 14, 2021 at 12:49 PM Bob Pearson <rpearsonhpe@gmail.com> wrote:
> >
> > This series of patches implements several bug fixes and minor
> > cleanups of the rxe driver. Specifically these fix a bug exposed
> > by blktest.
> >
> > They apply cleanly to both
> > commit 1b789bd4dbd48a92f5427d9c37a72a8f6ca17754 (origin/for-rc)
> > commit 6a217437f9f5482a3f6f2dc5fcd27cf0f62409ac (origin/for-next)
> >
> > The first patch is a rewrite of an earlier patch.
> > It adds memory barriers to kernel to kernel queues. The logic for this
> > is the same as an earlier patch that only treated user to kernel queues.
> > Without this patch kernel to kernel queues are expected to intermittently
> > fail at low frequency as was seen for the other queues.
> >
> > The second patch cleans up the state and type enums used by MRs.
> >
> > The third patch separates the keys in rxe_mr and ib_mr. This allows
> > the following sequence seen in the srp driver to work correctly.
> >
> >         do {
> >                 ib_post_send( IB_WR_LOCAL_INV )
> >                 ib_update_fast_reg_key()
> >                 ib_map_mr_sg()
> >                 ib_post_send( IB_WR_REG_MR )
> >         } while ( !done )
> >
> > The fourth patch creates duplicate mapping tables for fast MRs. This
> > prevents rkeys referencing fast MRs from accessing data from an updated
> > map after the call to ib_map_mr_sg() call by keeping the new and old
> > mappings separate and atomically swapping them when a reg mr WR is
> > executed.
> >
> > The fifth patch checks the type of MRs which receive local or remote
> > invalidate operations to prevent invalidating user MRs.
> >
> > v3->v4:
> > Two of the patches in v3 were accepted in v5.15 so have been dropped
> > here.
> >
> > The first patch was rewritten to correctly deal with queue operations
> > in rxe_verbs.c where the code is the client and not the server.
> >
> > v2->v3:
> > The v2 version had a typo which broke clean application to for-next.
> > Additionally in v3 the order of the patches was changed to make
> > it a little cleaner.
> 
> Hi Bob,
> 
> After applying these patches only top of 5.15-rc1. rping and mount
> NFSoRDMA works.

I've lost track with all the mails, are we good on this series now or
was there still more fixing needed?

Jason