Re: Kernel fast memory registration API proposal [RFC]

[Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>]

On Thu, Jul 16, 2015 at 09:52:44AM +0300, Sagi Grimberg wrote:
> >>I suggest to start with what I proposed. And in a later stage (if we
> >>still think its needed) we can have a higher level API that hides the
> >>post, something like:
> >
> >>rdma_reg_sg(struct ib_qp *qp,
> >>            struct ib_mr *mr,
> >>            struct scatterlist *sg,
> >>            int sg_nents,
> >>            u64 offset,
> >>            u64 length,
> >>            int access_flags)
> >
> >I still wonder what ?length? means in the context of a scatterlist.
> 
> Would byte_count be a more explanatory name?

What do you even need it for?  The total length is implicitly stored in
the S/G list as the list of all elements.

What's the offset for?  To allow skipping parts of a S/G list previously
mapped?
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