IB/mthca: Fill in max_map_per_fmr device attribute

Report the true max_map_per_fmr value from mthca_query_device(),
taking into account the change in FMR remapping introduced by the
Sinai performance optimization.

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index a2eae8a30167..8f89ba7c9147 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -115,6 +115,16 @@ static int mthca_query_device(struct ib_device *ibdev,
         props->max_mcast_qp_attach = MTHCA_QP_PER_MGM;
         props->max_total_mcast_qp_attach = props->max_mcast_qp_attach *
                                            props->max_mcast_grp;
+        /*
+         * If Sinai memory key optimization is being used, then only
+         * the 8-bit key portion will change.  For other HCAs, the
+         * unused index bits will also be used for FMR remapping.
+         */
+        if (mdev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
+                props->max_map_per_fmr = 255;
+        else
+                props->max_map_per_fmr =
+                        (1 << (32 - long_log2(mdev->limits.num_mpts))) - 1;
 
         err = 0;
  out: