[ofa-general] [PATCH] mlx4_core: Support creation of FMRs with pages smaller than 4K

[Jack Morgenstein]

From: Oren Duer <oren at mellanox.co.il>
mlx4_core: Support creation of FMRs with pages smaller than 4K

Actual smallest page size is given by device capabilities.

Signed-off-by: Oren Duer <oren at mellanox.co.il>
Signed-off-by: Jack Morgenstein <jackm at dev.mellanox.co.il>

---

Roland,

The device minimum page size should be taken from the device
capabilities, and not hard-coded.  This hard-coding has lead
to problems with new mlx4 firmware.

This is for your 2.6.26 git tree.

Jack

diff --git a/drivers/net/mlx4/mr.c b/drivers/net/mlx4/mr.c
index 79b317b..7123463 100644
--- 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 */