On Thu, 12 Dec 2019 10:13:27 -0800 Florian Fainelli <f.faine...@gmail.com> wrote:
Hi Florian, thanks for chiming in! > On 12/12/19 3:59 AM, Matthias Brugger wrote: > > > > > > On 12/12/2019 11:41, Andre Przywara wrote: > >> On Wed, 11 Dec 2019 10:23:16 +0100 > >> Matthias Brugger <matthias....@gmail.com> wrote: > >> > >> Hi, > >> > >>> On 09/12/2019 14:33, Sascha Dewald wrote: > >>>> Hello Amit, > >>>> > >>>> no problem. > >>>> > >>>> Is there some git feature branch, to have a look ? > >>> > >>> Yes I'd love to have a look as well :) > >> > >> We will send an RFC later this week, Amit is doing some cleanup now. At > >> the moment transfers work up to 256 packets (375KB when using TFTP), at > >> this point it breaks, because recycling DMA descriptors is not working for > >> some reason. I haven't found any documentation for the MAC, so I am > >> reverse engineering the Linux driver and doing printf and tcpdump > >> debugging right now. Looking forward to people joining us in this effort > >> ;-) > >> > > > > Thanks for the update. I CC'ed Florian who I think is the SW expert on that > > chip. Maybe he can help you. > > Transfers work for up to 256 packets in which direction? Are you > properly consuming descriptors that were produced by the RDMA (on > receive), Yes, not sure we do it properly, but we do. The problem I see is that the TDMA_CONS_INDEX does not increase after it reaches 256, although RDMA_PROD_INDEX does. Is there any cleanup in the actual descriptors needed? Did I get this right that those indices are just linear "progress counters", and not actual descriptor indices? I see the Linux code masks them with 0xffff, not with the number of descriptors. Will try to dig a bit deeper on this. > conversely, polling the TDMA consumer index on transmit? Yes, I switched over to that (from polling for the DMA_OWN bit). > Can you share your code somewhere so I could see if there are obvious > problems? Of course, we just need to clean it up a bit, and it's getting late for Amit today. We will CC: you on the post tomorrow. Thanks for you help! Cheers, Andre.
