diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index 83afb1541a74..81154a16d6b8 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -391,6 +391,23 @@ static int mlx4_how_many_lives_vf(struct mlx4_dev *dev)
 	return ret;
 }
 
+int mlx4_get_parav_qkey(struct mlx4_dev *dev, u32 qpn, u32 *qkey)
+{
+	u32 qk = MLX4_RESERVED_QKEY_BASE;
+	if (qpn >= dev->caps.base_tunnel_sqpn + 8 * MLX4_MFUNC_MAX ||
+	    qpn < dev->caps.sqp_start)
+		return -EINVAL;
+
+	if (qpn >= dev->caps.base_tunnel_sqpn)
+		/* tunnel qp */
+		qk += qpn - dev->caps.base_tunnel_sqpn;
+	else
+		qk += qpn - dev->caps.sqp_start;
+	*qkey = qk;
+	return 0;
+}
+EXPORT_SYMBOL(mlx4_get_parav_qkey);
+
 int mlx4_is_slave_active(struct mlx4_dev *dev, int slave)
 {
 	struct mlx4_priv *priv = mlx4_priv(dev);
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 7fbdc89de495..c30a314e095c 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -56,6 +56,13 @@ enum {
 	MLX4_MAX_PORTS		= 2
 };
 
+/* base qkey for use in sriov tunnel-qp/proxy-qp communication.
+ * These qkeys must not be allowed for general use. This is a 64k range,
+ * and to test for violation, we use the mask (protect against future chg).
+ */
+#define MLX4_RESERVED_QKEY_BASE  (0xFFFF0000)
+#define MLX4_RESERVED_QKEY_MASK  (0xFFFF0000)
+
 enum {
 	MLX4_BOARD_ID_LEN = 64
 };
@@ -293,6 +300,8 @@ struct mlx4_caps {
 	int			max_qp_init_rdma;
 	int			max_qp_dest_rdma;
 	int			sqp_start;
+	u32			base_sqpn;
+	u32			base_tunnel_sqpn;
 	int			num_srqs;
 	int			max_srq_wqes;
 	int			max_srq_sge;
@@ -772,4 +781,6 @@ int mlx4_wol_write(struct mlx4_dev *dev, u64 config, int port);
 int mlx4_counter_alloc(struct mlx4_dev *dev, u32 *idx);
 void mlx4_counter_free(struct mlx4_dev *dev, u32 idx);
 
+int mlx4_get_parav_qkey(struct mlx4_dev *dev, u32 qpn, u32 *qkey);
+
 #endif /* MLX4_DEVICE_H */