Here is a diff to enable the checksum offload support for bge(4).
Looking for any testing.
Index: if_bge.c
===================================================================
RCS file: /home/cvs/src/sys/dev/pci/if_bge.c,v
retrieving revision 1.340
diff -u -p -r1.340 if_bge.c
--- if_bge.c 25 Aug 2013 18:34:21 -0000 1.340
+++ if_bge.c 9 Sep 2013 18:42:29 -0000
@@ -2893,12 +2893,14 @@ bge_attach(struct device *parent, struct
/*
* 5700 B0 chips do not support checksumming correctly due
* to hardware bugs.
+ *
+ * It seems all controllers have a bug that can generate UDP
+ * datagrams with a checksum value 0 when TX UDP checksum
+ * offloading is enabled. Generating UDP checksum value 0 is
+ * a violation of RFC 768.
*/
if (sc->bge_chipid != BGE_CHIPID_BCM5700_B0)
- ifp->if_capabilities |= IFCAP_CSUM_IPv4;
-#if 0 /* TCP/UDP checksum offload breaks with pf(4) */
- ifp->if_capabilities |= IFCAP_CSUM_TCPv4|IFCAP_CSUM_UDPv4;
-#endif
+ ifp->if_capabilities |= IFCAP_CSUM_IPv4 | IFCAP_CSUM_TCPv4;
if (BGE_IS_JUMBO_CAPABLE(sc))
ifp->if_hardmtu = BGE_JUMBO_MTU;
--
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