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

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Date:   Wed, 3 Mar 2021 09:18:25 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Jesper Dangaard Brouer <brouer@...hat.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>
Subject: Re: [PATCH 4/5] net: page_pool: refactor dma_map into own function
 page_pool_dma_map

On Tue, Mar 02, 2021 at 08:49:06PM +0200, Ilias Apalodimas wrote:
> Hi Mel,
> 
> Can you please CC me in future revisions. I almost missed that!
> 

Will do.

> 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.

> [...]
>
> > 
> 
> Otherwise 
> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org> 

Thanks. I'll wait for other review feedback before sending a V2.

-- 
Mel Gorman
SUSE Labs