From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@suse.de>
Subject: Re: [patch 6/6] netif_release_rx_bufs
Date: Thu, 17 Aug 2006 17:13:34 +0200
Message-ID: <44E4879E.2060302@suse.de>
References: <C10A4423.1031%Keir.Fraser@cl.cam.ac.uk>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <C10A4423.1031%Keir.Fraser@cl.cam.ac.uk>
List-Unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: Xen devel list <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

Keir Fraser wrote:
>> I think we need either a way to get back pages with transfer grants
>> without cooperation from the backend driver, or we need some way to say
>> "pretty pretty please, give me back my rx buffers" to the netback driver.
> 
> Unlike a map grant, you can reclaim a transfer grant at any time. The only
> question is whether it has been used to transfer a page, or not.

How can I do that?  gnttab_end_foreign_transfer_ref() doesn't cut it, it
will not succeed unconditionally ...

cheers,
  Gerd

-- 
Gerd Hoffmann <kraxel@suse.de>
http://www.suse.de/~kraxel/julika-dora.jpeg