Function mlx5_doorbell_ring

dpdk/drivers/common/mlx5/mlx5_common.h:402–421

* Ring a doorbell and flush the update if requested. * * @param uar * Pointer to UAR data structure. * @param val * value to write in big endian format. * @param index * Index of doorbell record. * @param db_rec * Address of doorbell record. * @param flash * Decide whether to flush the DB writing using a memory barrier. */

 *   Decide whether to flush the DB writing using a memory barrier.
 */
static __rte_always_inline void
mlx5_doorbell_ring(struct mlx5_uar_data *uar, uint64_t val, uint32_t index,
		   volatile uint32_t *db_rec, bool flash)
{
	rte_io_wmb();
	*db_rec = rte_cpu_to_be_32(index);
	/* Ensure ordering between DB record actual update and UAR access. */
	rte_wmb();
#ifdef RTE_ARCH_64
	*uar->db = val;
#else /* !RTE_ARCH_64 */
	rte_spinlock_lock(uar->sl_p);
	*(volatile uint32_t *)uar->db = val;
	rte_io_wmb();
	*((volatile uint32_t *)uar->db + 1) = val >> 32;
	rte_spinlock_unlock(uar->sl_p);
#endif
	if (flash)
		rte_wmb();
}

/**
 * Get the doorbell register mapping type.