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

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Date:   Wed, 12 Jul 2023 10:26:03 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     Alexander Lobakin <aleksander.lobakin@...el.com>,
        Yunsheng Lin <yunshenglin0825@...il.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 Wed, 12 Jul 2023 20:34:12 +0800 Yunsheng Lin wrote:
> >> C sources can include $path/page_pool.h, headers should generally only
> >> include $path/page_pool/types.h.  
> 
> Does spliting the page_pool.h as above fix the problem about including
> a ton of static inline functions from "linux/dma-mapping.h" in skbuff.c?
> 
> As the $path/page_pool/helpers.h which uses dma_get_cache_alignment()
> must include the "linux/dma-mapping.h" which has dma_get_cache_alignment()
> defining as a static inline function.
> and if skbuff.c include $path/page_pool.h or $path/page_pool/helpers.h,
> doesn't we still have the same problem? Or do I misunderstand something
> here?

I should have clarified that "types.h" should also include pure
function declarations (and possibly static line wrappers like
pure get/set functions which only need locally defined types).

The skbuff.h only needs to include $path/page_pool/types.h, right?

I know that Olek has a plan to remove the skbuff dependency completely
but functionally / for any future dependencies - this should work?