Add the trunk(4) driver for providing link aggregation, failover and fault

tolerance.  This driver allows aggregation of multiple network interfaces as
one virtual interface using a number of different protocols/algorithms.

failover    - Sends traffic through the secondary port if the master becomes
              inactive.
fec         - Supports Cisco Fast EtherChannel.
lacp        - Supports the IEEE 802.3ad Link Aggregation Control Protocol
              (LACP) and the Marker Protocol.
loadbalance - Static loadbalancing using an outgoing hash.
roundrobin  - Distributes outgoing traffic using a round-robin scheduler
              through all active ports.

This code was obtained from OpenBSD and this also includes 802.3ad LACP support
from agr(4) in NetBSD.

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index d66774c..1b4ef93 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -186,6 +186,7 @@ struct ifnet {
 	TAILQ_HEAD(, ifg_list) if_groups; /* linked list of groups per if */
 					/* protected by if_addr_mtx */
 	void	*if_pf_kif;
+	void	*if_trunk;		/* trunk glue */
 };
 
 typedef void if_init_f_t(void *);