D2546.diff
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	Index: head/sys/dev/sfxge/sfxge.c
	===================================================================
	--- head/sys/dev/sfxge/sfxge.c
	+++ head/sys/dev/sfxge/sfxge.c
	@@ -282,10 +282,14 @@
	ifp->if_hwassist \|= (CSUM_TCP_IPV6 \| CSUM_UDP_IPV6);
	else
	ifp->if_hwassist &= ~(CSUM_TCP_IPV6 \| CSUM_UDP_IPV6);
	- if (ifp->if_capenable & IFCAP_TSO)
	- ifp->if_hwassist \|= CSUM_TSO;
	- else
	- ifp->if_hwassist &= ~CSUM_TSO;
	+
	+ /*
	+ * The kernel takes both IFCAP_TSOx and CSUM_TSO into
	+ * account before using TSO. So, we do not touch
	+ * checksum flags when IFCAP_TSOx is modified.
	+ * Note that CSUM_TSO is (CSUM_IP_TSO\|CSUM_IP6_TSO),
	+ * but both bits are set in IPv4 and IPv6 mbufs.
	+ */

	SFXGE_ADAPTER_UNLOCK(sc);
	break;