Here is a diff to enable the checksum offload support for ix(4).
Looking for any testing.
Index: if_ix.c
===================================================================
RCS file: /home/cvs/src/sys/dev/pci/if_ix.c,v
retrieving revision 1.92
diff -u -p -r1.92 if_ix.c
--- if_ix.c 23 Aug 2013 19:44:14 -0000 1.92
+++ if_ix.c 9 Sep 2013 18:47:15 -0000
@@ -1543,9 +1543,7 @@ ixgbe_setup_interface(struct ix_softc *s
ifp->if_capabilities |= IFCAP_VLAN_HWTAGGING;
#endif
-#ifdef IX_CSUM_OFFLOAD
ifp->if_capabilities |= IFCAP_CSUM_TCPv4 | IFCAP_CSUM_UDPv4;
-#endif
/*
* Specify the media types supported by this sc and register
--
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