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[RFC,V2,2/5] Add a new device flag for zero copy

Message ID 1291975075.2167.31.camel@localhost.localdomain (mailing list archive)
State New, archived
Headers show

Commit Message

Shirley Ma Dec. 10, 2010, 9:57 a.m. UTC 
None
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Patch

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