diff --git a/sys/dev/mlx5/mlx5_ib/mlx5_ib.h b/sys/dev/mlx5/mlx5_ib/mlx5_ib.h
--- a/sys/dev/mlx5/mlx5_ib/mlx5_ib.h
+++ b/sys/dev/mlx5/mlx5_ib/mlx5_ib.h
@@ -456,7 +456,7 @@
 	struct ib_pd		       *pd;
 	unsigned int			page_shift;
 	unsigned int			npages;
-	u32				length;
+	u64				length;
 	int				access_flags;
 	u32				mkey;
 };
diff --git a/sys/dev/mlx5/mlx5_ib/mlx5_ib_mr.c b/sys/dev/mlx5/mlx5_ib/mlx5_ib_mr.c
--- a/sys/dev/mlx5/mlx5_ib/mlx5_ib_mr.c
+++ b/sys/dev/mlx5/mlx5_ib/mlx5_ib_mr.c
@@ -442,7 +442,8 @@
 		ent->order = i + 2;
 		ent->dev = dev;
 
-		if (dev->mdev->profile->mask & MLX5_PROF_MASK_MR_CACHE)
+		if ((dev->mdev->profile->mask & MLX5_PROF_MASK_MR_CACHE) &&
+		    (mlx5_core_is_pf(dev->mdev)))
 			limit = dev->mdev->profile->mr_cache[i].limit;
 		else
 			limit = 0;
@@ -681,7 +682,7 @@
 
 	for (i = 0; i < 1; i++) {
 		mr = alloc_cached_mr(dev, order);
-		if (mr)
+		if (mr || !mlx5_core_is_pf(dev->mdev))
 			break;
 
 		err = add_keys(dev, order2idx(dev, order), 1);