diff --git a/sys/dev/ath/if_ath.c b/sys/dev/ath/if_ath.c
index 8f13b267c0e4..745a0d5a9509 100644
--- a/sys/dev/ath/if_ath.c
+++ b/sys/dev/ath/if_ath.c
@@ -3966,9 +3966,21 @@ ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
 					sc->sc_stats.ast_tx_fifoerr++;
 				if (ts->ts_status & HAL_TXERR_FILT)
 					sc->sc_stats.ast_tx_filtered++;
+				if (ts->ts_status & HAL_TXERR_XTXOP)
+					sc->sc_stats.ast_tx_xtxop++;
+				if (ts->ts_status & HAL_TXERR_TIMER_EXPIRED)
+					sc->sc_stats.ast_tx_timerexpired++;
+
+				/* XXX HAL_TX_DATA_UNDERRUN */
+				/* XXX HAL_TX_DELIM_UNDERRUN */
+
 				if (bf->bf_m->m_flags & M_FF)
 					sc->sc_stats.ast_ff_txerr++;
 			}
+			/* XXX when is this valid? */
+			if (ts->ts_status & HAL_TX_DESC_CFG_ERR)
+				sc->sc_stats.ast_tx_desccfgerr++;
+
 			sr = ts->ts_shortretry;
 			lr = ts->ts_longretry;
 			sc->sc_stats.ast_tx_shortretry += sr;
diff --git a/sys/dev/ath/if_ath_sysctl.c b/sys/dev/ath/if_ath_sysctl.c
index 8e064971bfbc..6c1a6b210425 100644
--- a/sys/dev/ath/if_ath_sysctl.c
+++ b/sys/dev/ath/if_ath_sysctl.c
@@ -709,6 +709,12 @@ ath_sysctl_stats_attach(struct ath_softc *sc)
 	    &sc->sc_stats.ast_tx_timeout, 0, "TX Global Timeout");
 	SYSCTL_ADD_UINT(ctx, child, OID_AUTO, "ast_tx_cst", CTLFLAG_RD,
 	    &sc->sc_stats.ast_tx_cst, 0, "TX Carrier Sense Timeout");
+	SYSCTL_ADD_UINT(ctx, child, OID_AUTO, "ast_tx_xtxop", CTLFLAG_RD,
+	    &sc->sc_stats.ast_tx_xtxop, 0, "TX exceeded TXOP");
+	SYSCTL_ADD_UINT(ctx, child, OID_AUTO, "ast_tx_timerexpired", CTLFLAG_RD,
+	    &sc->sc_stats.ast_tx_timerexpired, 0, "TX exceeded TX_TIMER register");
+	SYSCTL_ADD_UINT(ctx, child, OID_AUTO, "ast_tx_desccfgerr", CTLFLAG_RD,
+	    &sc->sc_stats.ast_tx_desccfgerr, 0, "TX Descriptor Cfg Error");
 
 	/* Attach the RX phy error array */
 	ath_sysctl_stats_attach_rxphyerr(sc, child);
diff --git a/sys/dev/ath/if_athioctl.h b/sys/dev/ath/if_athioctl.h
index 1c9d23fe7cd7..98dd03791d99 100644
--- a/sys/dev/ath/if_athioctl.h
+++ b/sys/dev/ath/if_athioctl.h
@@ -121,17 +121,20 @@ struct ath_stats {
 	u_int32_t	ast_be_missed;	/* missed beacons */
 	u_int32_t	ast_ani_cal;	/* ANI calibrations performed */
 	u_int32_t	ast_rx_agg;	/* number of aggregate frames RX'ed */
-	u_int32_t	ast_rx_halfgi;
-	u_int32_t	ast_rx_2040;
-	u_int32_t	ast_rx_pre_crc_err;
-	u_int32_t	ast_rx_post_crc_err;
-	u_int32_t	ast_rx_decrypt_busy_err;
+	u_int32_t	ast_rx_halfgi;	/* RX half-GI */
+	u_int32_t	ast_rx_2040;	/* RX 40mhz frame */
+	u_int32_t	ast_rx_pre_crc_err;	/* RX pre-delimiter CRC error */
+	u_int32_t	ast_rx_post_crc_err;	/* RX post-delimiter CRC error */
+	u_int32_t	ast_rx_decrypt_busy_err;	/* RX decrypt engine busy error */
 	u_int32_t	ast_rx_hi_rx_chain;
 	u_int32_t	ast_tx_htprotect;	/* HT tx frames with protection */
-	u_int32_t	ast_rx_hitqueueend;
+	u_int32_t	ast_rx_hitqueueend;	/* RX hit descr queue end */
 	u_int32_t	ast_tx_timeout;		/* Global TX timeout */
 	u_int32_t	ast_tx_cst;		/* Carrier sense timeout */
-	u_int32_t	ast_pad[16];
+	u_int32_t	ast_tx_xtxop;	/* tx exceeded TXOP */
+	u_int32_t	ast_tx_timerexpired;	/* tx exceeded TX_TIMER */
+	u_int32_t	ast_tx_desccfgerr;	/* tx desc cfg error */
+	u_int32_t	ast_pad[13];
 };
 
 #define	SIOCGATHSTATS	_IOWR('i', 137, struct ifreq)