mlx4_core: Support creation of FMRs with pages smaller than 4K

Don't hard code a test against a minimum page shift of 12, since the
device may support smaller pages.  Test against the actual smallest
page size from the device capabilities.

Signed-off-by: Oren Duer <oren@mellanox.co.il>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/net/mlx4/mr.c b/drivers/net/mlx4/mr.c
index cb46446..03a9abc 100644 (file)
--- a/drivers/net/mlx4/mr.c
+++ b/drivers/net/mlx4/mr.c
@@ -551,7 +551,7 @@ int mlx4_fmr_alloc(struct mlx4_dev *dev, u32 pd, u32 access, int max_pages,
        u64 mtt_seg;
        int err = -ENOMEM;
 
-       if (page_shift < 12 || page_shift >= 32)
+       if (page_shift < (ffs(dev->caps.page_size_cap) - 1) || page_shift >= 32)
                return -EINVAL;
 
        /* All MTTs must fit in the same page */