IB/mlx4: Limit size of fast registration WRs

Fix the limit on the size of max fast registration WRs that can be
posted to match hardware capabilities.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/mlx4/main.c

@@ -135,7 +135,7 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
 	props->max_srq		   = dev->dev->caps.num_srqs - dev->dev->caps.reserved_srqs;
 	props->max_srq_wr	   = dev->dev->caps.max_srq_wqes - 1;
 	props->max_srq_sge	   = dev->dev->caps.max_srq_sge;
-	props->max_fast_reg_page_list_len = PAGE_SIZE / sizeof (u64);
+	props->max_fast_reg_page_list_len = MLX4_MAX_FAST_REG_PAGES;
 	props->local_ca_ack_delay  = dev->dev->caps.local_ca_ack_delay;
 	props->atomic_cap	   = dev->dev->caps.flags & MLX4_DEV_CAP_FLAG_ATOMIC ?
 		IB_ATOMIC_HCA : IB_ATOMIC_NONE;

drivers/infiniband/hw/mlx4/mr.c

@@ -226,7 +226,7 @@ struct ib_fast_reg_page_list *mlx4_ib_alloc_fast_reg_page_list(struct ib_device
 	struct mlx4_ib_fast_reg_page_list *mfrpl;
 	int size = page_list_len * sizeof (u64);
 
-	if (size > PAGE_SIZE)
+	if (page_list_len > MLX4_MAX_FAST_REG_PAGES)
 		return ERR_PTR(-EINVAL);
 
 	mfrpl = kmalloc(sizeof *mfrpl, GFP_KERNEL);

include/linux/mlx4/device.h

@@ -171,6 +171,10 @@ enum {
 	MLX4_NUM_FEXCH          = 64 * 1024,
 };
 
+enum {
+	MLX4_MAX_FAST_REG_PAGES = 511,
+};
+
 static inline u64 mlx4_fw_ver(u64 major, u64 minor, u64 subminor)
 {
 	return (major << 32) | (minor << 16) | subminor;