- Updated TOE support in the kernel.

- Stateful TCP offload drivers for Terminator 3 and 4 (T3 and T4) ASICs.
  These are available as t3_tom and t4_tom modules that augment cxgb(4)
  and cxgbe(4) respectively.  The cxgb/cxgbe drivers continue to work as
  usual with or without these extra features.

- iWARP driver for Terminator 3 ASIC (kernel verbs).  T4 iWARP in the
  works and will follow soon.

Build-tested with make universe.

30s overview
============
What interfaces support TCP offload?  Look for TOE4 and/or TOE6 in the
capabilities of an interface:
# ifconfig -m | grep TOE

Enable/disable TCP offload on an interface (just like any other ifnet
capability):
# ifconfig cxgbe0 toe
# ifconfig cxgbe0 -toe

Which connections are offloaded?  Look for toe4 and/or toe6 in the
output of netstat and sockstat:
# netstat -np tcp | grep toe
# sockstat -46c | grep toe

Reviewed by:	bz, gnn
Sponsored by:	Chelsio communications.
MFC after:	~3 months (after 9.1, and after ensuring MFC is feasible)

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index ab078b8..3d57953 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -712,6 +712,8 @@ drbr_inuse(struct ifnet *ifp, struct buf_ring *br)
 #define	IF_MINMTU	72
 #define	IF_MAXMTU	65535
 
+#define	TOEDEV(ifp)	((ifp)->if_llsoftc)
+
 #endif /* _KERNEL */
 
 /*