[dpdk-dev] [PATCH v4 3/6] bus: introduce device level DMA memory mapping

[Thomas Monjalon]

10/03/2019 09:28, Shahaf Shuler:
> For PCI bus devices, the pci driver can expose its own map and unmap
> functions to be used for the mapping. In case the driver doesn't provide
> any, the memory will be mapped, if possible, to IOMMU through VFIO APIs.
> 
> Application usage with those APIs is quite simple:
> * allocate memory
> * call rte_extmem_register on the memory chunk.
> * take a device, and query its rte_device.
> * call the device specific mapping function for this device.

Should we make it documented somewhere?

> +/**
> + * Device level DMA map function.
> + * After a successful call, the memory segment will be mapped to the
> + * given device.
> + *
> + * @note: Memory must be registered in advance using rte_extmem_* APIs.

Could we make more explicit that this function is part of
the "external memory API"?