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 >
