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From: David Miller <davem@davemloft.net>
To: hancockrwd@gmail.com
Cc: bzolnier@gmail.com, linux-kernel@vger.kernel.org,
	netdev@vger.kernel.org, linux-usb@vger.kernel.org
Subject: Re: [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networking drivers
Date: Sat, 27 Feb 2010 01:53:50 -0800 (PST)	[thread overview]
Message-ID: <20100227.015350.71138134.davem@davemloft.net> (raw)
In-Reply-To: <51f3faa71002261908y7cfa62eeicb3e56d5c920887a@mail.gmail.com>

From: Robert Hancock <hancockrwd@gmail.com>
Date: Fri, 26 Feb 2010 21:08:04 -0600

> That seems like a reasonable approach to me. Only question is how to
> implement the check for DMA_64BIT. Can we just check page_to_phys on
> each of the pages in the skb to see if it's > 0xffffffff ? Are there
> any architectures where it's more complicated than that?

On almost every platform it's "more complicated than that".

This is the whole issue.  What matters is the final DMA address and
since we have IOMMUs and the like, it is absolutely not tenable to
solve this by checking physical address attributes.

  reply	other threads:[~2010-02-27  9:53 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-23  2:45 [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networking drivers Robert Hancock
2010-02-26  9:36 ` David Miller
2010-02-26 14:46   ` Robert Hancock
2010-02-26 14:46     ` Robert Hancock
2010-02-26 15:25     ` Bartlomiej Zolnierkiewicz
2010-02-27  3:08       ` Robert Hancock
2010-02-27  3:08         ` Robert Hancock
2010-02-27  9:53         ` David Miller [this message]
2010-02-27 11:59           ` Bartlomiej Zolnierkiewicz
2010-02-27 12:05             ` David Miller
2010-02-27 18:15               ` Robert Hancock
2010-02-27 18:15                 ` Robert Hancock
2010-02-27 18:38                 ` FUJITA Tomonori
2010-02-27 18:38                   ` FUJITA Tomonori
2010-02-28  8:16                   ` David Miller
2010-02-28  8:16                     ` David Miller
2010-03-01 16:34                     ` Was: Re: [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networking, Now: SWIOTLB dynamic allocation Konrad Rzeszutek Wilk
2010-03-01 21:12                       ` Robert Hancock
2010-03-01 21:12                         ` Robert Hancock
2010-03-02  4:40                         ` FUJITA Tomonori
2010-03-02  4:40                           ` FUJITA Tomonori
2010-03-02  4:40                       ` FUJITA Tomonori
2010-02-27 17:59           ` [RFC PATCH] fix problems with NETIF_F_HIGHDMA in networking drivers Robert Hancock
2010-02-27 17:59             ` Robert Hancock
2010-02-27 18:38             ` FUJITA Tomonori
2010-02-27 18:38               ` FUJITA Tomonori

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