From: Florian Fainelli <f.fainelli@gmail.com>
To: Jesper Dangaard Brouer <brouer@redhat.com>,
netdev@vger.kernel.org, linux-mm@kvack.org
Cc: "Toke Høiland-Jørgensen" <toke@toke.dk>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
willy@infradead.org, "Saeed Mahameed" <saeedm@mellanox.com>,
"Alexander Duyck" <alexander.duyck@gmail.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
mgorman@techsingularity.net,
"David S. Miller" <davem@davemloft.net>,
"Tariq Toukan" <tariqt@mellanox.com>
Subject: Re: [net-next PATCH V2 1/3] mm: add dma_addr_t to struct page
Date: Tue, 12 Feb 2019 10:05:39 -0800 [thread overview]
Message-ID: <dc34bb0b-1efd-4200-2ee7-bf8adef8a0b5@gmail.com> (raw)
In-Reply-To: <154998294324.8783.9045146111677125556.stgit@firesoul>
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@redhat.com>
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
> Acked-by: Andrew Morton <akpm@linux-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
next prev parent reply other threads:[~2019-02-12 18:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-12 14:48 [net-next PATCH V2 0/3] Fix page_pool API and dma address storage Jesper Dangaard Brouer
2019-02-12 14:49 ` [net-next PATCH V2 1/3] mm: add dma_addr_t to struct page Jesper Dangaard Brouer
2019-02-12 18:05 ` Florian Fainelli [this message]
2019-02-12 18:19 ` Jesper Dangaard Brouer
2019-02-12 18:23 ` Florian Fainelli
2019-02-12 14:49 ` [net-next PATCH V2 2/3] net: page_pool: don't use page->private to store dma_addr_t Jesper Dangaard Brouer
2019-02-12 14:49 ` [net-next PATCH V2 3/3] page_pool: use DMA_ATTR_SKIP_CPU_SYNC for DMA mappings Jesper Dangaard Brouer
2019-02-12 17:12 ` kbuild test robot
2019-02-12 17:58 ` Jesper Dangaard Brouer
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