netdev - Re: [net-next PATCH V2 1/3] mm: add dma_addr

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Message-ID: <dc34bb0b-1efd-4200-2ee7-bf8adef8a0b5@gmail.com>
Date:   Tue, 12 Feb 2019 10:05:39 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org,
        linux-mm@...ck.org
Cc:     Toke Høiland-Jørgensen <toke@...e.dk>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        willy@...radead.org, Saeed Mahameed <saeedm@...lanox.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        mgorman@...hsingularity.net,
        "David S. Miller" <davem@...emloft.net>,
        Tariq Toukan <tariqt@...lanox.com>
Subject: Re: [net-next PATCH V2 1/3] mm: add dma_addr_t to struct page

On 2/12/19 6:49 AM, Jesper Dangaard Brouer wrote:
> The page_pool API is using page->private to store DMA addresses.
> As pointed out by David Miller we can't use that on 32-bit architectures
> with 64-bit DMA
> 
> This patch adds a new dma_addr_t struct to allow storing DMA addresses
> 
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
> Acked-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  include/linux/mm_types.h |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index 2c471a2c43fa..581737bd0878 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -95,6 +95,13 @@ struct page {
>  			 */
>  			unsigned long private;
>  		};
> +		struct {	/* page_pool used by netstack */
> +			/**
> +			 * @dma_addr: page_pool requires a 64-bit value even on
> +			 * 32-bit architectures.
> +			 */

Nit: might require? dma_addr_t, as you mention in the commit may have a
different size based on CONFIG_ARCH_DMA_ADDR_T_64BIT.
-- 
Florian