[dpdk-dev] [PATCH v3 3/6] ena: disable readless communication regarding to HW revision

[Jan Mędala]

Bruce,

Here's explanation of readless communication (on behalf of Alex):

> "readless" refers to ability to read ENA registers without actually
> issuing read request from host (x86).
> Instead, host programs 2 registers on device that trigger DMA from device
> to host and report register value.
> However, this functionality is not going to be available in all type of
> devices. The decision if this mode is supported or not , is taken from
> revision_id in pci configuration space.


Regards

  Jan

2016-07-04 17:43 GMT+02:00 Bruce Richardson <bruce.richardson at intel.com>:

> On Thu, Jun 30, 2016 at 05:04:56PM +0200, Jan Medala wrote:
> > Depending on HW revision readless communcation between host and device
> > may be unavailable.
> > In that case prevent PMD of seting up readless communication mechanism.
> >
> The idea of readless communication is a strange one. Can you provide a bit
> more detail as to what "readless communication" refers to.
>
> /Bruce
>