On 28-09-2017 03:43, Casey Leedom wrote: > | From: Raj, Ashok <ashok.raj@xxxxxxxxx> > | Sent: Wednesday, September 27, 2017 12:07 PM > | > | looking at the debug output i got from Harsh it still looks like a bug in > | the code. > | > | [ 538.284589] __domain_mapping nr_pages 0x1 > | [ 538.284600] __domain_mapping sg_res 0x1 sg->dma_address 0xf291000e dma len > | 0x38 pteval 0x3cbce3003 phys_pfn 0x3cbce3 > | [ 538.284604] chelsio driver - offset 4110 len 56 dma addr f291000e dma len > | 56 > | [ 538.284667] DMAR: DRHD: handling fault status reg 2 > | [ 538.290017] DMAR: [DMA Write] Request device [02:00.4] fault addr f2910000 > | [fault reason 05] PTE Write access is not set > | > | somehow when crypto_authenc_encrypt() -> scatterwalk_ffwd()-> sg_set_page() > | > | ->sg_set_page(dst, sg_page(src), src->length - len, src->offset + len); > | > | src->offset + len gets set as sg->offset in sg_set_page(). Either the > | assumption that there should be room is incorrect, or some higher order > | crypto Input received from user(Here XFRM) contains AAD(Additional Authentication data) || DATA(enc/dec) || Tag(hash). before passing input to Cipher engine(chelsio) crypto_authenc_encrypt has to skip AAD which is 16 in our case. To skip that 16 bytes they simply incremented offset by 16. I think Robin is right DMA mapping should handle it. > | code that ends up setting the offset did the wrong calculation. > | > | if src->offset is already towards the end of the page, then offset+len will > | go beyond the end of page. > > Hhmmm, it seems like we need Herbert to comment on this. > > Herbert, is there any specific debugging information that you'd like to > see here? > > Casey
