On Wed, 2017-09-20 at 16:01 +0800, Herbert Xu wrote: > Harsh Jain <Harsh@xxxxxxxxxxx> wrote: > > > > While debugging DMA mapping error in chelsio crypto driver we > observed that when scatter/gather list received by driver has some > entry with page->offset > 4096 (PAGE_SIZE). It starts giving DMA > error. Without IOMMU it works fine. > > This is not a bug. The network stack can and will feed us such > SG lists. Hm? Under what circumstances is the offset permitted to be > PAGE_SIZE?
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