Here is a diff to enable the checksum offload support for jme(4).
Tested with..
jme0 at pci4 dev 0 function 0 "JMicron JMC250" rev 0x11
Index: if_jme.c
===================================================================
RCS file: /home/cvs/src/sys/dev/pci/if_jme.c,v
retrieving revision 1.28
diff -u -p -r1.28 if_jme.c
--- if_jme.c 22 Oct 2012 09:19:17 -0000 1.28
+++ if_jme.c 4 Nov 2012 06:40:12 -0000
@@ -614,12 +614,8 @@ jme_attach(struct device *parent, struct
IFQ_SET_READY(&ifp->if_snd);
strlcpy(ifp->if_xname, sc->sc_dev.dv_xname, IFNAMSIZ);
- ifp->if_capabilities = IFCAP_VLAN_MTU;
-
-#ifdef JME_CHECKSUM
- ifp->if_capabilities |= IFCAP_CSUM_IPv4 | IFCAP_CSUM_TCPv4 |
- IFCAP_CSUM_UDPv4;
-#endif
+ ifp->if_capabilities = IFCAP_VLAN_MTU | IFCAP_CSUM_IPv4 |
+ IFCAP_CSUM_TCPv4 | IFCAP_CSUM_UDPv4;
#if NVLAN > 0
ifp->if_capabilities |= IFCAP_VLAN_HWTAGGING;
--
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