RE: [PATCH] mmc: add API for data write using scatter gather DMA

[Amitkumar Karwar <akarwar@marvell.com>]

Hi Ulf,

> From: linux-wireless-owner@vger.kernel.org [mailto:linux-wireless-
> owner@vger.kernel.org] On Behalf Of Ulf Hansson
> Sent: Friday, April 22, 2016 7:48 PM
> To: Amitkumar Karwar
> Cc: linux-wireless@vger.kernel.org; Nishant Sarmukadam; linux-mmc; Bing
> Zhao; Cathy Luo; Bing Zhao; Xinming Hu
> Subject: Re: [PATCH] mmc: add API for data write using scatter gather
> DMA
> 
> On 29 March 2016 at 14:57, Amitkumar Karwar <akarwar@marvell.com> wrote:
> > From: Bing Zhao <bzhao@marvell.com>
> >
> > This patch adds new API for SDIO scatter gather.
> >
> > Existing mmc_io_rw_extended() API expects caller to pass single
> > contiguous buffer. It will be split if it exceeds segment size, SG
> > table is prepared and used it for reading/writing the data.
> >
> > Our intention for defining new API here is to facilitate caller to
> > provide ready SG table(scattered buffer list). It will be useful for
> > the drivers which intend to handle SDIO SG internally.
> >
> > Signed-off-by: Bing Zhao <bzhao@marvell.com>
> > Signed-off-by: Xinming Hu <huxm@marvell.com>
> > Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
> > ---
> 
> So this has been posted and discussed earlier. In upcoming revisions,
> please attach that history so people know when reviewing.
> 
> Moreover, if you have been using this API to improve throughput, perhaps
> you can provide us with some numbers as well!?
> 

Thanks for your comments.
We are working on the updated version to resolve them. We will include the changelist history and share the throughput improvement numbers.

Regards,
Amitkumar