diff --git a/sys/dev/iwx/if_iwx.c b/sys/dev/iwx/if_iwx.c
--- a/sys/dev/iwx/if_iwx.c
+++ b/sys/dev/iwx/if_iwx.c
@@ -5659,6 +5659,11 @@
 	if (rinfo == NULL)
 		return EINVAL;
 
+	/* Sequence number assignment */
+	if ((m->m_flags & M_AMPDU_MPDU) == 0)
+		ieee80211_output_seqno_assign(ni, -1, m);
+
+	/* Radiotap */
 	if (ieee80211_radiotap_active_vap(vap)) {
 		struct iwx_tx_radiotap_header *tap = &sc->sc_txtap;
 
@@ -5671,6 +5676,7 @@
 		ieee80211_radiotap_tx(vap, m);
 	}
 
+	/* Encrypt - CCMP via direct HW path, TKIP/WEP indirected openbsd-style for now */
 	if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 		k = ieee80211_crypto_get_txkey(ni, m);
 		if (k == NULL) {
@@ -10453,6 +10459,8 @@
 	    IEEE80211_C_BGSCAN		/* capable of bg scanning */
 	    ;
 	ic->ic_flags_ext = IEEE80211_FEXT_SCAN_OFFLOAD;
+	/* Enable seqno offload */
+	ic->ic_flags_ext |= IEEE80211_FEXT_SEQNO_OFFLOAD;
 
 	ic->ic_txstream = 2;
 	ic->ic_rxstream = 2;