lkml.org 
[lkml]   [2017]   [Sep]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: DMA error when sg->offset value is greater than PAGE_SIZE in Intel IOMMU
From
Date
On Wed, 2017-09-20 at 16:01 +0800, Herbert Xu wrote:
> Harsh Jain <Harsh@chelsio.com> 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? [unhandled content-type:application/x-pkcs7-signature]
\
 
 \ /
  Last update: 2017-09-25 20:46    [W:0.285 / U:1.052 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site