[dpdk-dev] [PATCH v2 3/3] virtio: Add a new layer to abstract pci access method

Yuanhan Liu yuanhan.liu at linux.intel.com
Fri Jan 29 10:17:01 CET 2016

On Thu, Jan 28, 2016 at 06:33:32PM +0900, Tetsuya Mukawa wrote:
> This patch addss function pointers to abstract pci access method.
> This abstraction layer will be used when virtio-net PMD supports
> container extension.
> The below functions abstract how to access to pci configuration space.
> struct virtio_pci_cfg_ops {
>         int   (*map)(...);
>         void  (*unmap)(...);
>         void *(*get_mapped_addr)(...);
>         int   (*read)(...);
> };
> The pci configuration space has information how to access to virtio
> device registers. Basically, there are 2 ways to acccess to the
> registers. One is using portio and the other is using mapped memory.
> The below functions abstract this access method.

One question: is there a way to map PCI memory with Qtest? I'm thinking
if we can keep the io_read/write() for Qtest as well, if so, code could
be simplified, a lot, IMO.


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