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From: Jason Gunthorpe <jgg@ziepe.ca>
To: linux-rdma@vger.kernel.org
Cc: Jason Gunthorpe <jgg@mellanox.com>,
	Artemy Kovalyov <artemyko@mellanox.com>
Subject: [PATCH 1/6] RDMA/mlx5: Do not allow rereg of a ODP MR
Date: Tue,  1 Oct 2019 12:38:16 -0300
Message-ID: <20191001153821.23621-2-jgg@ziepe.ca> (raw)
In-Reply-To: <20191001153821.23621-1-jgg@ziepe.ca>

From: Jason Gunthorpe <jgg@mellanox.com>

This code is completely broken, the umem of a ODP MR simply cannot be
discarded without a lot more locking, nor can an ODP mkey be blithely
destroyed via destroy_mkey().

Fixes: 6aec21f6a832 ("IB/mlx5: Page faults handling infrastructure")
Reviewed-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---
 drivers/infiniband/hw/mlx5/mr.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c
index 1eff031ef04842..e7f840f306e46a 100644
--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -1441,6 +1441,9 @@ int mlx5_ib_rereg_user_mr(struct ib_mr *ib_mr, int flags, u64 start,
 	if (!mr->umem)
 		return -EINVAL;
 
+	if (is_odp_mr(mr))
+		return -EOPNOTSUPP;
+
 	if (flags & IB_MR_REREG_TRANS) {
 		addr = virt_addr;
 		len = length;
@@ -1486,8 +1489,6 @@ int mlx5_ib_rereg_user_mr(struct ib_mr *ib_mr, int flags, u64 start,
 		}
 
 		mr->allocated_from_cache = 0;
-		if (IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING))
-			mr->live = 1;
 	} else {
 		/*
 		 * Send a UMR WQE
@@ -1516,7 +1517,6 @@ int mlx5_ib_rereg_user_mr(struct ib_mr *ib_mr, int flags, u64 start,
 
 	set_mr_fields(dev, mr, npages, len, access_flags);
 
-	update_odp_mr(mr);
 	return 0;
 
 err:
-- 
2.23.0


  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-01 15:38 [PATCH -rc 0/6] Bug fixes for odp Jason Gunthorpe
2019-10-01 15:38 ` Jason Gunthorpe [this message]
2019-10-01 15:38 ` [PATCH 2/6] RDMA/mlx5: Fix a race with mlx5_ib_update_xlt on an implicit MR Jason Gunthorpe
2019-10-02  8:18   ` Leon Romanovsky
2019-10-02 14:39     ` Jason Gunthorpe
2019-10-02 15:41       ` Leon Romanovsky
2019-10-03 12:48         ` Jason Gunthorpe
2019-10-01 15:38 ` [PATCH 3/6] RDMA/odp: Lift umem_mutex out of ib_umem_odp_unmap_dma_pages() Jason Gunthorpe
2019-10-01 15:38 ` [PATCH 4/6] RDMA/mlx5: Order num_pending_prefetch properly with synchronize_srcu Jason Gunthorpe
2019-10-01 15:38 ` [PATCH 5/6] RDMA/mlx5: Put live in the correct place for ODP MRs Jason Gunthorpe
2019-10-01 15:38 ` [PATCH 6/6] RDMA/mlx5: Add missing synchronize_srcu() for MW cases Jason Gunthorpe
2019-10-03  8:54   ` Leon Romanovsky
2019-10-03 12:33     ` Jason Gunthorpe
2019-10-04 18:55 ` [PATCH -rc 0/6] Bug fixes for odp Jason Gunthorpe

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