Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755880Ab1DTToR (ORCPT ); Wed, 20 Apr 2011 15:44:17 -0400 Received: from e5.ny.us.ibm.com ([32.97.182.145]:58328 "EHLO e5.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755807Ab1DTToQ (ORCPT ); Wed, 20 Apr 2011 15:44:16 -0400 Subject: [PATCH V3 2/8] Add a new zerocopy device flag From: Shirley Ma To: David Miller Cc: mst@redhat.com, Eric Dumazet , Avi Kivity , Arnd Bergmann , netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <1303328216.19336.18.camel@localhost.localdomain> References: <1303328216.19336.18.camel@localhost.localdomain> Content-Type: text/plain; charset="UTF-8" Date: Wed, 20 Apr 2011 12:44:08 -0700 Message-ID: <1303328648.19336.24.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 (2.28.3-1.fc12) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1001 Lines: 29 This zerocopy flag is used to support device DMA userspace buffers. Signed-off-by: Shirley Ma --- include/linux/netdevice.h | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 0249fe7..0998d3d 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -1067,6 +1067,9 @@ struct net_device { #define NETIF_F_RXHASH (1 << 28) /* Receive hashing offload */ #define NETIF_F_RXCSUM (1 << 29) /* Receive checksumming offload */ +/* bit 29 is for device to map userspace buffers -- zerocopy */ +#define NETIF_F_ZEROCOPY (1 << 29) + /* Segmentation offload features */ #define NETIF_F_GSO_SHIFT 16 #define NETIF_F_GSO_MASK 0x00ff0000 -- 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/