From patchwork Wed May 4 07:55:17 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shirley Ma X-Patchwork-Id: 752912 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p447tlSs013599 for ; Wed, 4 May 2011 07:55:47 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751954Ab1EDHzX (ORCPT ); Wed, 4 May 2011 03:55:23 -0400 Received: from e4.ny.us.ibm.com ([32.97.182.144]:47568 "EHLO e4.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751850Ab1EDHzV (ORCPT ); Wed, 4 May 2011 03:55:21 -0400 Received: from d01relay03.pok.ibm.com (d01relay03.pok.ibm.com [9.56.227.235]) by e4.ny.us.ibm.com (8.14.4/8.13.1) with ESMTP id p447YnGk019419; Wed, 4 May 2011 03:34:49 -0400 Received: from d01av01.pok.ibm.com (d01av01.pok.ibm.com [9.56.224.215]) by d01relay03.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p447tL1q101996; Wed, 4 May 2011 03:55:21 -0400 Received: from d01av01.pok.ibm.com (loopback [127.0.0.1]) by d01av01.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p447tKUk001204; Wed, 4 May 2011 03:55:20 -0400 Received: from [9.49.139.150] (sig-9-49-139-150.mts.ibm.com [9.49.139.150]) by d01av01.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id p447tIJY001127; Wed, 4 May 2011 03:55:19 -0400 Subject: [PATCH V4 2/8] netdevice.h: Add a new zerocopy device flag From: Shirley Ma To: David Miller , mst@redhat.com, Eric Dumazet , Avi Kivity , Arnd Bergmann Cc: netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 04 May 2011 00:55:17 -0700 Message-ID: <1304495717.20660.67.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 (2.28.3-1.fc12) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Wed, 04 May 2011 07:55:47 +0000 (UTC) Signed-off-by: Shirley Ma --- include/linux/netdevice.h | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 0249fe7..0808f1e 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1067,6 +1067,16 @@ struct net_device { #define NETIF_F_RXHASH (1 << 28) /* Receive hashing offload */ #define NETIF_F_RXCSUM (1 << 29) /* Receive checksumming offload */ +/* + * Bit 31 is for device to map userspace buffers -- zerocopy + * Device can set this flag when it supports HIGHDMA. + * Device can't recycle this kind of skb buffers. + * There are 256 bytes copied, the rest of buffers are mapped. + * The userspace callback should only be called when last reference to this skb + * is gone. + */ +#define NETIF_F_ZEROCOPY (1 << 31) + /* Segmentation offload features */ #define NETIF_F_GSO_SHIFT 16 #define NETIF_F_GSO_MASK 0x00ff0000