From: Jon Hunter <jonathanh@xxxxxxxxxx> Date: Jul/26/2019, 15:11:00 (UTC+00:00) > > On 25/07/2019 16:12, Jose Abreu wrote: > > From: Jon Hunter <jonathanh@xxxxxxxxxx> > > Date: Jul/25/2019, 15:25:59 (UTC+00:00) > > > >> > >> On 25/07/2019 14:26, Jose Abreu wrote: > >> > >> ... > >> > >>> Well, I wasn't expecting that :/ > >>> > >>> Per documentation of barriers I think we should set descriptor fields > >>> and then barrier and finally ownership to HW so that remaining fields > >>> are coherent before owner is set. > >>> > >>> Anyway, can you also add a dma_rmb() after the call to > >>> stmmac_rx_status() ? > >> > >> Yes. I removed the debug print added the barrier, but that did not help. > > > > So, I was finally able to setup NFS using your replicated setup and I > > can't see the issue :( > > > > The only difference I have from yours is that I'm using TCP in NFS > > whilst you (I believe from the logs), use UDP. > > So I tried TCP by setting the kernel boot params to 'nfsvers=3' and > 'proto=tcp' and this does appear to be more stable, but not 100% stable. > It still appears to fail in the same place about 50% of the time. > > > You do have flow control active right ? And your HW FIFO size is >= 4k ? > > How can I verify if flow control is active? You can check it by dumping register MTL_RxQ_Operation_Mode (0xd30). Can you also add IOMMU debug in file "drivers/iommu/iommu.c" ? --- Thanks, Jose Miguel Abreu
