linux-kernel - [RFC PATCH V2 2/5] Add a new device flag for zero copy

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Message-ID: <1291975075.2167.31.camel@localhost.localdomain>
Date:	Fri, 10 Dec 2010 01:57:55 -0800
From:	Shirley Ma <mashirle@...ibm.com>
To:	Avi Kivity <avi@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	mst@...hat.com
Cc:	xiaohui.xin@...el.com, netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH V2 2/5] Add a new device flag for zero copy

Signed-off-by: Shirley Ma <xma@...ibm.com>
---

 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 d8fd2c2..7207665 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -857,6 +857,9 @@ struct net_device {
 #define NETIF_F_NTUPLE		(1 << 27) /* N-tuple filters supported */
 #define NETIF_F_RXHASH		(1 << 28) /* Receive hashing 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


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