netdev - Re: [PATCH 4/5] net: page_pool: refactor dma_map into own function page_pool_dma

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Message-ID: <20210303111919.3c6e29cc@carbon>
Date:   Wed, 3 Mar 2021 11:19:19 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Net <netdev@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux-NFS <linux-nfs@...r.kernel.org>, brouer@...hat.com
Subject: Re: [PATCH 4/5] net: page_pool: refactor dma_map into own function
 page_pool_dma_map

On Wed, 3 Mar 2021 09:18:25 +0000
Mel Gorman <mgorman@...hsingularity.net> wrote:
> On Tue, Mar 02, 2021 at 08:49:06PM +0200, Ilias Apalodimas wrote:
> > On Mon, Mar 01, 2021 at 04:11:59PM +0000, Mel Gorman wrote:  
> > > From: Jesper Dangaard Brouer <brouer@...hat.com>
> > > 
> > > In preparation for next patch, move the dma mapping into its own
> > > function, as this will make it easier to follow the changes.
> > > 
> > > V2: make page_pool_dma_map return boolean (Ilias)
> > >   
> > 
> > [...]
> >   
> > > @@ -211,30 +234,14 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
> > >  	if (!page)
> > >  		return NULL;
> > >  
> > > -	if (!(pool->p.flags & PP_FLAG_DMA_MAP))
> > > -		goto skip_dma_map;
> > > -
> > > -	/* Setup DMA mapping: use 'struct page' area for storing DMA-addr
> > > -	 * since dma_addr_t can be either 32 or 64 bits and does not always fit
> > > -	 * into page private data (i.e 32bit cpu with 64bit DMA caps)
> > > -	 * This mapping is kept for lifetime of page, until leaving pool.
> > > -	 */
> > > -	dma = dma_map_page_attrs(pool->p.dev, page, 0,
> > > -				 (PAGE_SIZE << pool->p.order),
> > > -				 pool->p.dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
> > > -	if (dma_mapping_error(pool->p.dev, dma)) {
> > > +	if (pp_flags & PP_FLAG_DMA_MAP &&  
> > 
> > Nit pick but can we have if ((pp_flags & PP_FLAG_DMA_MAP) && ...
> >   
> 
> Done.

Thanks for fixing this nitpick, and carrying the patch.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer