Function vfio_enable_intx

dpdk/lib/eal/linux/eal_interrupts.c:103–148

enable legacy (INTx) interrupts */

/* enable legacy (INTx) interrupts */
static int
vfio_enable_intx(const struct rte_intr_handle *intr_handle) {
	struct vfio_irq_set *irq_set;
	char irq_set_buf[IRQ_SET_BUF_LEN];
	int len, ret, vfio_dev_fd;
	int *fd_ptr;

	len = sizeof(irq_set_buf);

	/* enable INTx */
	irq_set = (struct vfio_irq_set *) irq_set_buf;
	irq_set->argsz = len;
	irq_set->count = 1;
	irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
	irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
	irq_set->start = 0;
	fd_ptr = (int *) &irq_set->data;
	*fd_ptr = rte_intr_fd_get(intr_handle);

	vfio_dev_fd = rte_intr_dev_fd_get(intr_handle);
	ret = ioctl(vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);

	if (ret) {
		RTE_LOG(ERR, EAL, "Error enabling INTx interrupts for fd %d\n",
			rte_intr_fd_get(intr_handle));
		return -1;
	}

	/* unmask INTx after enabling */
	memset(irq_set, 0, len);
	len = sizeof(struct vfio_irq_set);
	irq_set->argsz = len;
	irq_set->count = 1;
	irq_set->flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK;
	irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
	irq_set->start = 0;

	ret = ioctl(vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);

	if (ret) {
		RTE_LOG(ERR, EAL, "Error unmasking INTx interrupts for fd %d\n",
			rte_intr_fd_get(intr_handle));
		return -1;
	}
	return 0;
}

/* disable legacy (INTx) interrupts */
static int