On 28-09-2017 02:59, Casey Leedom wrote: > Hey Raj, > > Let us know if you need help in gathering more debugging information. For > the time being we've decided to ERRATA the use of the Intel I/O MMU with > IPsec till we Root Cause the issue. But this is still at the top of Harsh's > bug list. > > With Robin's comments, I'm almost sure that the: > > (iov_pfn + sg->offset) << VTD_PAGE_SHIFT) > > in your suggested patch is an issue. iov_pfn is a Page Frame Number and > sg->offset is a Byte Offset. It feels like this should be: > > size_t page_off = sg->offset & ~VTD_PAGE_MASK; > unsigned long pfn_off = sg->offset >> VTD_PAGE_MASK; > ... > sg->dma_address = ((dma_addr_t) > (iov_pfn + pfn_off) << VTD_PAGE_SHIFT) + page_off; > > When Harsh tried your original patch, Harsh' test system wouldn't even boot. Today I tried with "Intel_iommu=sp_off" boot option. Traffic runs without any error for more than 1 hrs. What magic this option did? :) > > Casey
