netdev - Re: [PATCH net-next v2] net: page_pool: API cleanup and comments

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Date:   Mon, 17 Feb 2020 08:41:33 +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 v2] net: page_pool: API cleanup and comments

On Mon, 17 Feb 2020 08:28:49 +0200
Ilias Apalodimas <ilias.apalodimas@...aro.org> wrote:

> diff --git a/include/net/page_pool.h b/include/net/page_pool.h
> index cfbed00ba7ee..7c1f23930035 100644
> --- a/include/net/page_pool.h
> +++ b/include/net/page_pool.h
> @@ -162,39 +162,33 @@ static inline void page_pool_use_xdp_mem(struct page_pool *pool,
>  }
>  #endif
>  
> -/* Never call this directly, use helpers below */
> -void __page_pool_put_page(struct page_pool *pool, struct page *page,
> -			  unsigned int dma_sync_size, bool allow_direct);
> +void page_pool_release_page(struct page_pool *pool, struct page *page);
>  
> -static inline void page_pool_put_page(struct page_pool *pool,
> -				      struct page *page, bool allow_direct)
> +/* If the page refcnt == 1, this will try to recycle the page.
> + * if PP_FLAG_DMA_SYNC_DEV is set, it will try to sync the DMA area for
> + * the configured size min(dma_sync_size, pool->max_len).
> + * If the page refcnt != page will be returned

Is this last comment line fully formed?


> + */
> +void page_pool_put_page(struct page_pool *pool, struct page *page,
> +			unsigned int dma_sync_size, bool allow_direct);
> +
> +/* Same as above but will try to sync the entire area pool->max_len */
> +static inline void page_pool_put_full_page(struct page_pool *pool,
> +					   struct page *page, bool allow_direct)



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