linux-kernel - Re: [PATCH net-next v4] net: page

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Date:   Tue, 18 Feb 2020 18:17:51 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc:     brouer@...hat.com, netdev@...r.kernel.org,
        jonathan.lemon@...il.com, lorenzo@...nel.org, toke@...hat.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org
Subject: Re: [PATCH net-next v4] net: page_pool: API cleanup and comments

On Tue, 18 Feb 2020 16:10:31 +0200
Ilias Apalodimas <ilias.apalodimas@...aro.org> wrote:

> Functions starting with __ usually indicate those which are exported,
> but should not be called directly. Update some of those declared in the
> API and make it more readable.
> 
> page_pool_unmap_page() and page_pool_release_page() were doing
> exactly the same thing calling __page_pool_clean_page().  Let's
> rename __page_pool_clean_page() to page_pool_release_page() and
> export it in order to show up on perf logs and get rid of
> page_pool_unmap_page().
> 
> Finally rename __page_pool_put_page() to page_pool_put_page() since we
> can now directly call it from drivers and rename the existing
> page_pool_put_page() to page_pool_put_full_page() since they do the same
> thing but the latter is trying to sync the full DMA area.
> 
> This patch also updates netsec, mvneta and stmmac drivers which use
> those functions.
> 
> Acked-by: Toke Høiland-Jørgensen <toke@...hat.com>
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>

LGTM - on a quick review (not compile tested...).

Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>

> ---
> Changes since
> v1:
> - Fixed netsec driver compilation error
> v2:
> - Improved comment description of page_pool_put_page()
> v3:
> - Properly define page_pool_release_page() in the header file
>   within an ifdef since xdp.c uses it even if CONFIG_PAGE_POOL is not selected
> - rename __page_pool_clean_page -> page_pool_release_page and get rid of
> another redundant helper

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