Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S932472Ab1EQVso (ORCPT <rfc822;w@1wt.eu>);
	Tue, 17 May 2011 17:48:44 -0400
Received: from mail-qw0-f46.google.com ([209.85.216.46]:49392 "EHLO
	mail-qw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S932375Ab1EQVsm convert rfc822-to-8bit (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 17 May 2011 17:48:42 -0400
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:from:date:message-id:subject:to
         :cc:content-type:content-transfer-encoding;
        b=NqOD9DlcTw2f88pycDHq4MwA9BuTc/qAzhiYe7jyiJ0f9+3zI8vOJcQd8FagK4/PeQ
         G9FMj7l2lefLphbVCKMbMJ66/VFVPeRXOymGNxK/d9N1CHLyXGQkdcGS3JZDuAB/Hse1
         a/FILQbyReNMA5OICN+MfFtzGQhmIJ8Tz839E=
MIME-Version: 1.0
In-Reply-To: <1305588738.3456.65.camel@localhost.localdomain>
References: <1305574128.3456.23.camel@localhost.localdomain>
 <1305574518.2885.25.camel@bwh-desktop> <1305574680.3456.33.camel@localhost.localdomain>
 <1305575253.2885.28.camel@bwh-desktop> <20110516211459.GE18148@redhat.com> <1305588738.3456.65.camel@localhost.localdomain>
From: =?ISO-8859-2?Q?Micha=B3_Miros=B3aw?= <mirqus@gmail.com>
Date: Tue, 17 May 2011 23:48:21 +0200
Message-ID: <BANLkTimvOK3tyo6+L5AD=so5DjiDPV-AAA@mail.gmail.com>
Subject: Re: [PATCH V5 2/6 net-next] netdevice.h: Add zero-copy flag in netdevice
To: Shirley Ma <mashirle@us.ibm.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
        Ben Hutchings <bhutchings@solarflare.com>,
        David Miller <davem@davemloft.net>,
        Eric Dumazet <eric.dumazet@gmail.com>, Avi Kivity <avi@redhat.com>,
        Arnd Bergmann <arnd@arndb.de>, netdev@vger.kernel.org,
        kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Content-Type: text/plain; charset=ISO-8859-2
Content-Transfer-Encoding: 8BIT
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 682
Lines: 17

2011/5/17 Shirley Ma <mashirle@us.ibm.com>:
> Hello Michael,
>
> Looks like to use a new flag requires more time/work. I am thinking
> whether we can just use HIGHDMA flag to enable zero-copy in macvtap to
> avoid the new flag for now since mavctap uses real NICs as lower device?

Is there any other restriction besides requiring driver to not recycle
the skb? Are there any drivers that recycle TX skbs?

Best Regards,
Micha? Miros?aw
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/