netdev - Re: [PATCH v5 RFC 1/6] page_pool: frag API support for 32-bit arch with 64-bit DMA

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Date: Mon, 10 Jul 2023 11:38:41 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Yunsheng Lin <yunshenglin0825@...il.com>, Alexander Lobakin
 <aleksander.lobakin@...el.com>
Cc: Yunsheng Lin <linyunsheng@...wei.com>, davem@...emloft.net,
 pabeni@...hat.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 Lorenzo Bianconi <lorenzo@...nel.org>, Alexander Duyck
 <alexander.duyck@...il.com>, Liang Chen <liangchen.linux@...il.com>, Saeed
 Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>, Eric
 Dumazet <edumazet@...gle.com>, Jesper Dangaard Brouer <hawk@...nel.org>,
 Ilias Apalodimas <ilias.apalodimas@...aro.org>, linux-rdma@...r.kernel.org
Subject: Re: [PATCH v5 RFC 1/6] page_pool: frag API support for 32-bit arch
 with 64-bit DMA

On Sun, 9 Jul 2023 20:54:12 +0800 Yunsheng Lin wrote:
> > And the include is still here, too, eh..  
> 
> In V4, it has:
> 
> --- a/include/net/page_pool.h
> +++ b/include/net/page_pool.h
> @@ -33,6 +33,7 @@ 
>  #include <linux/mm.h> /* Needed by ptr_ring */
>  #include <linux/ptr_ring.h>
>  #include <linux/dma-direction.h>
> +#include <linux/dma-mapping.h>
> 
> As dma_get_cache_alignment() defined in dma-mapping.h is used
> here, so we need to include dma-mapping.h.
> 
> I though the agreement is that this patch only remove the
> "#include <linux/dma-direction.h>" as we dma-mapping.h has included
> dma-direction.h.
> 
> And Alexander will work on excluding page_pool.h from skbuff.h
> https://lore.kernel.org/all/09842498-b3ba-320d-be8d-348b85e8d525@intel.com/
> 
> Did I miss something obvious here？ Or there is better way to do it
> than the method discussed in the above thread?

We're adding a ton of static inline functions to what is a fairly core
header for networking, that's what re-triggered by complaint:

 include/net/page_pool.h                       | 179 ++++++++++++++----

Maybe we should revisit the idea of creating a new header file for
inline helpers... Olek, WDYT?