linux-kernel - Re: [RFC PATCH] fix problems with NETIF_F

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Message-Id: <20100228.001628.48507956.davem@davemloft.net>
Date:	Sun, 28 Feb 2010 00:16:28 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	fujita.tomonori@....ntt.co.jp
Cc:	hancockrwd@...il.com, bzolnier@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networking
 drivers

From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Date: Sun, 28 Feb 2010 03:38:19 +0900

> When I proposed such approach (always use swiotlb) before, IIRC,
> the objections were:
> 
> - better to make allocation respect dma_mask. (I don't think that this
>   approach is possible since we don't know which device handles data
>   later when we allocate memory).

And such objects might end up being processed by multiple devices with
different DMA restrictions.

> - swiotlb is not good for small systems since it allocates too much
>   memory (we can fix this though).

Indeed.
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