mlx4: Enforce device max FMR maps in FMR alloc

ConnectX devices have a limit on the number of mappings that can be
done on an FMR before having to call sync_tpt.  The current
mlx4_ib driver reports the limit correctly in max_map_per_fmr in
.query_device(), but mlx4_core doesn't check it when actually
allocating FMRs.

Add a max_fmr_maps field to struct mlx4_caps and enforce this maximum
value on FMR allocations.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index 7b445df6a667..e152837b75a5 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -163,7 +163,7 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
         props->max_mcast_qp_attach = dev->dev->caps.num_qp_per_mgm;
         props->max_total_mcast_qp_attach = props->max_mcast_qp_attach *
                                            props->max_mcast_grp;
-        props->max_map_per_fmr = (1 << (32 - ilog2(dev->dev->caps.num_mpts))) - 1;
+        props->max_map_per_fmr = dev->dev->caps.max_fmr_maps;
 
 out:
         kfree(in_mad);