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RDMA/mlx5: Ensure created mkeys always have a populated rb_key

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BugLink: https://bugs.launchpad.net/bugs/2075154

commit 2e4c02fdecf2f6f55cefe48cb82d93fa4f8e2204 upstream.

cachable and mmkey.rb_key together are used by mlx5_revoke_mr() to put the
MR/mkey back into the cache. In all cases they should be set correctly.

alloc_cacheable_mr() was setting cachable but not filling rb_key,
resulting in cache_ent_find_and_store() bucketing them all into a 0 length
entry.

implicit_get_child_mr()/mlx5_ib_alloc_implicit_mr() failed to set cachable
or rb_key at all, so the cache was not working at all for implicit ODP.

Cc: stable@vger.kernel.org
Fixes: 8c1185fef68c ("RDMA/mlx5: Change check for cacheable mkeys")
Fixes: dd1b913fb0 ("RDMA/mlx5: Cache all user cacheable mkeys on dereg MR flow")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/7778c02dfa0999a30d6746c79a23dd7140a9c729.1716900410.git.leon@kernel.org
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Jason Gunthorpe
2024-05-28 15:52:54 +03:00
committed by Roxana Nicolescu
parent e4b04e1f3c
commit 044d9c44e9
1 changed files with 2 additions and 1 deletions
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drivers/infiniband/hw/mlx5/mr.c
+2 -1
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@@ -718,6 +718,8 @@ static struct mlx5_ib_mr *_mlx5_mr_cache_alloc(struct mlx5_ib_dev *dev,
}
mr->mmkey.cache_ent = ent;
mr->mmkey.type = MLX5_MKEY_MR;
mr->mmkey.rb_key = ent->rb_key;
mr->mmkey.cacheable = true;
init_waitqueue_head(&mr->mmkey.wait);
return mr;
}
@@ -1168,7 +1170,6 @@ static struct mlx5_ib_mr *alloc_cacheable_mr(struct ib_pd *pd,
mr->ibmr.pd = pd;
mr->umem = umem;
mr->page_shift = order_base_2(page_size);
mr->mmkey.cacheable = true;
set_mr_fields(dev, mr, umem->length, access_flags, iova);
return mr;