Re: Kernel fast memory registration API proposal [RFC]

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Sun, Jul 19, 2015 at 08:45:26AM +0300, Sagi Grimberg wrote:
> 
> >/**
> >   * ib_mr_set_sg() - populate memory region buffers
> >   *     array from a SG list
> >   * @mr:          memory region
> >   * @sg:          sg list
> >   * @sg_nents:    number of elements in the sg
> >   *
> >   * Can fail if the HW is not able to register this
> >   * sg list. In case of failure - caller is responsible
> >   * to handle it (bounce-buffer, multiple registrations...)
> >   */
> >int ib_mr_set_sg(struct ib_mr *mr,
> >                  struct scatterlist *sg,
> >                  unsigned short sg_nents);
> 
> I'm thinking now that this should have an input argument
> of block_size. Maybe in the future ULPs would want to register
> huge pages, it will be a shame to map it into PAGE_SIZE chunks...

Why wouldn't it just transparently support huge pages? sg seems to
have enough information.

Jason
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