[Open-FCoE] [net-next-2.6 PATCH 3/5] net: Add NETIF_F_FCOE_MTU to indicate support for a different MTU for FCoE

Jeff Kirsher jeffrey.t.kirsher at intel.com
Wed Jul 22 23:29:09 UTC 2009


From: Yi Zou <yi.zou at intel.com>

Add NETIF_F_FCOE_MTU to indicate that the NIC can support a secondary MTU for
converged traffic of LAN and Fiber Channel over Ethernet (FCoE). The MTU for
FCoE is 2158 = 14 (FCoE header) + 24 (FC header) + 2112 (FC max payload) +
4 (FC CRC) + 4 (FCoE trailer).

Signed-off-by: Yi Zou <yi.zou at intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher at intel.com>
---

 include/linux/netdevice.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9f25ab2..9192cdf 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -701,6 +701,7 @@ struct net_device
 /* the GSO_MASK reserves bits 16 through 23 */
 #define NETIF_F_FCOE_CRC	(1 << 24) /* FCoE CRC32 */
 #define NETIF_F_SCTP_CSUM	(1 << 25) /* SCTP checksum offload */
+#define NETIF_F_FCOE_MTU	(1 << 26) /* Supports max FCoE MTU, 2158 bytes*/
 
 	/* Segmentation offload features */
 #define NETIF_F_GSO_SHIFT	16




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