Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755638Ab1DTTsb (ORCPT ); Wed, 20 Apr 2011 15:48:31 -0400 Received: from mail.solarflare.com ([216.237.3.220]:43730 "EHLO exchange.solarflare.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755869Ab1DTTsa (ORCPT ); Wed, 20 Apr 2011 15:48:30 -0400 Subject: Re: [PATCH V3 2/8] Add a new zerocopy device flag From: Ben Hutchings To: Shirley Ma Cc: David Miller , 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: <1303328648.19336.24.camel@localhost.localdomain> References: <1303328216.19336.18.camel@localhost.localdomain> <1303328648.19336.24.camel@localhost.localdomain> Content-Type: text/plain; charset="UTF-8" Organization: Solarflare Communications Date: Wed, 20 Apr 2011 20:48:26 +0100 Message-ID: <1303328906.2823.24.camel@bwh-desktop> Mime-Version: 1.0 X-Mailer: Evolution 2.32.1 (2.32.1-1.fc14) Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 20 Apr 2011 19:48:29.0724 (UTC) FILETIME=[EC23DDC0:01CBFF93] X-TM-AS-Product-Ver: SMEX-8.0.0.1181-6.500.1024-18084.004 X-TM-AS-Result: No--7.681700-0.000000-31 X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1512 Lines: 44 On Wed, 2011-04-20 at 12:44 -0700, Shirley Ma wrote: > 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) Look above. Ben. > /* Segmentation offload features */ > #define NETIF_F_GSO_SHIFT 16 > #define NETIF_F_GSO_MASK 0x00ff0000 > > > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Ben Hutchings, Senior Software Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- 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/