net: Add NETIF_F_FCOE_MTU to indicate support for a different MTU for FCoE

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@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 9f25ab2..9192cdf 100644 (file)
--- 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