From: Avihai Horon avihaih@nvidia.com
[ Upstream commit d43b020b0f82c088ef8ff3196ef00575a97d200e ]
relaxed_ordering_read HCA capability is set if both the device supports relaxed ordering (RO) read and RO is set in PCI config space.
RO in PCI config space can change during runtime. This will change the value of relaxed_ordering_read HCA capability in FW, but the driver will not see it since it queries the capabilities only once.
This can lead to the following scenario: 1. RO in PCI config space is enabled. 2. User creates MKey without RO. 3. RO in PCI config space is disabled. As a result, relaxed_ordering_read HCA capability is turned off in FW but remains on in driver copy of the capabilities. 4. User requests to reconfig the MKey with RO via UMR. 5. Driver will try to reconfig the MKey with RO read although it shouldn't (as relaxed_ordering_read HCA capability is really off).
To fix this, check pcie_relaxed_ordering_enabled() before setting RO read in UMR.
Fixes: 896ec9735336 ("RDMA/mlx5: Set mkey relaxed ordering by UMR with ConnectX-7") Signed-off-by: Avihai Horon avihaih@nvidia.com Reviewed-by: Shay Drory shayd@nvidia.com Link: https://lore.kernel.org/r/8d39eb8317e7bed1a354311a20ae707788fd94ed.168113155... Reviewed-by: Jacob Keller jacob.e.keller@intel.com Signed-off-by: Leon Romanovsky leon@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/hw/mlx5/umr.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/hw/mlx5/umr.c b/drivers/infiniband/hw/mlx5/umr.c index d5105b5c9979b..cb5cee3dee2b6 100644 --- a/drivers/infiniband/hw/mlx5/umr.c +++ b/drivers/infiniband/hw/mlx5/umr.c @@ -380,6 +380,9 @@ static void mlx5r_umr_set_access_flags(struct mlx5_ib_dev *dev, struct mlx5_mkey_seg *seg, unsigned int access_flags) { + bool ro_read = (access_flags & IB_ACCESS_RELAXED_ORDERING) && + pcie_relaxed_ordering_enabled(dev->mdev->pdev); + MLX5_SET(mkc, seg, a, !!(access_flags & IB_ACCESS_REMOTE_ATOMIC)); MLX5_SET(mkc, seg, rw, !!(access_flags & IB_ACCESS_REMOTE_WRITE)); MLX5_SET(mkc, seg, rr, !!(access_flags & IB_ACCESS_REMOTE_READ)); @@ -387,8 +390,7 @@ static void mlx5r_umr_set_access_flags(struct mlx5_ib_dev *dev, MLX5_SET(mkc, seg, lr, 1); MLX5_SET(mkc, seg, relaxed_ordering_write, !!(access_flags & IB_ACCESS_RELAXED_ORDERING)); - MLX5_SET(mkc, seg, relaxed_ordering_read, - !!(access_flags & IB_ACCESS_RELAXED_ORDERING)); + MLX5_SET(mkc, seg, relaxed_ordering_read, ro_read); }
int mlx5r_umr_rereg_pd_access(struct mlx5_ib_mr *mr, struct ib_pd *pd,