From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Hutchings Subject: Re: [PATCH V3 2/8] Add a new zerocopy device flag Date: Wed, 20 Apr 2011 20:48:26 +0100 Message-ID: <1303328906.2823.24.camel@bwh-desktop> References: <1303328216.19336.18.camel@localhost.localdomain> <1303328648.19336.24.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit 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 To: Shirley Ma Return-path: In-Reply-To: <1303328648.19336.24.camel@localhost.localdomain> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org 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.