[PATCH v4 3/4] bus/cdx: add support for MSI

[Thomas Monjalon]

08/05/2023 13:18, Nipun Gupta:
> MSI's are exposed to the devices using VFIO (vfio-cdx). This
> patch uses the same to add support for MSI for the devices on
> the cdx bus.
> 
> A couple of API's have been introduced in the EAL interrupt
> framework:
> - rte_intr_irq_count_set: This API is used to set the total
>     interrupts on the interrupt handle. This would be provided
>     by VFIO (irq.count) for VFIO enabled devices.
> - rte_intr_irq_count_get: This API returns the total number
>     interrupts which were set.
[...]
> --- a/lib/eal/common/eal_interrupts.h
> +++ b/lib/eal/common/eal_interrupts.h
> @@ -16,6 +16,7 @@ struct rte_intr_handle {
>  	};
>  	uint32_t alloc_flags;	/**< flags passed at allocation */
>  	enum rte_intr_handle_type type;  /**< handle type */
> +	uint32_t irq_count;		/**< IRQ count provided via VFIO */

Why only via VFIO?

[...]
> +/**
> + * @internal
> + * Set the irq count field of interrupt handle with user
> + * provided irq count value.
> + *
> + * @param intr_handle
> + *  pointer to the interrupt handle.
> + * @param irq_count
> + *  IRQ count

Please write IRQ all uppercase consistently.
Same for CDX.

> +	rte_intr_irq_count_get;
> +	rte_intr_irq_count_set;

Adding a new API in EAL deserves a separate commit with a different audience.
It looks like it has been hidden from EAL reviewers eyes so far.