MLX4_MAC_VALID
table->entries[free] = cpu_to_be64(mac | MLX4_MAC_VALID);
dup_table->entries[free] = cpu_to_be64(mac | MLX4_MAC_VALID);
table->entries[index] = cpu_to_be64(new_mac | MLX4_MAC_VALID);
dup_table->entries[index] = cpu_to_be64(new_mac | MLX4_MAC_VALID);