Index: head/sys/dev/sfxge/sfxge_tx.c
===================================================================
--- head/sys/dev/sfxge/sfxge_tx.c
+++ head/sys/dev/sfxge/sfxge_tx.c
@@ -361,6 +361,7 @@
 	int rc;
 	int i;
 	int eop;
+	uint16_t hw_vlan_tci_prev;
 	int vlan_tagged;
 
 	KASSERT(!txq->blocked, ("txq->blocked"));
@@ -412,6 +413,8 @@
 
 	used_map = &stmp->map;
 
+	hw_vlan_tci_prev = txq->hw_vlan_tci;
+
 	vlan_tagged = sfxge_tx_maybe_insert_tag(txq, mbuf);
 	if (vlan_tagged) {
 		sfxge_next_stmp(txq, &stmp);
@@ -463,6 +466,7 @@
 	return (0);
 
 reject_mapped:
+	txq->hw_vlan_tci = hw_vlan_tci_prev;
 	bus_dmamap_unload(txq->packet_dma_tag, *used_map);
 reject:
 	/* Drop the packet on the floor. */