linux-kernel - Re: [PATCH V2] net: ethernet: mellanox: correct page conversion

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Message-ID: <20160418140520.GC11539@x-vnc01.mtx.labs.mlnx>
Date:	Mon, 18 Apr 2016 17:05:20 +0300
From:	Eli Cohen <eli@...lanox.com>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	linux-rdma@...r.kernel.org, timur@...eaurora.org,
	cov@...eaurora.org, Yishai Hadas <yishaih@...lanox.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] net: ethernet: mellanox: correct page conversion

Sure, this is not the complete patch. As far as I know the problem
you're facing with arm is that virt_to_page() does not provide the
correct page descriptor so my suggestion will eliminate the need for
it.

On Mon, Apr 18, 2016 at 09:53:30AM -0400, Sinan Kaya wrote:
> On 4/18/2016 2:54 AM, Eli Cohen wrote:
> > Sinan,
> > 
> > if we get rid of the part this code:
> > 
> >                 if (BITS_PER_LONG == 64) {
> >                         struct page **pages;
> >                         pages = kmalloc(sizeof *pages * buf->nbufs, gfp);
> >                         if (!pages)
> >                                 goto err_free;
> >                         ...
> >                         ...
> >                         if (!buf->direct.buf)
> >                                 goto err_free;
> >                 }
> > 
> > Does that solve the arm issue?
> 
> I will test. As far as I know, there is one more place these DMA addresses
> are called with vmap. This is in mlx4_en_map_buffer.
> 
> I was trying to rearrange the allocation so that vmap actually works.
> 
> What do you think about mlx4_en_map_buffer?
> 
> 
> -- 
> Sinan Kaya
> Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
> --
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