Index: head/sys/dev/sfxge/common/ef10_mac.c
===================================================================
--- head/sys/dev/sfxge/common/ef10_mac.c
+++ head/sys/dev/sfxge/common/ef10_mac.c
@@ -571,8 +571,19 @@
 			goto fail8;
 	}
 
+	if (encp->enc_hlb_counters) {
+		const struct efx_mac_stats_range ef10_hlb[] = {
+			{ EFX_MAC_RXDP_HLB_IDLE, EFX_MAC_RXDP_HLB_TIMEOUT },
+		};
+		if ((rc = efx_mac_stats_mask_add_ranges(maskp, mask_size,
+		    ef10_hlb, EFX_ARRAY_SIZE(ef10_hlb))) != 0)
+			goto fail9;
+	}
+
 	return (0);
 
+fail9:
+	EFSYS_PROBE(fail9);
 fail8:
 	EFSYS_PROBE(fail8);
 fail7:
@@ -1025,6 +1036,13 @@
 	    &value);
 	EFSYS_STAT_SET_QWORD(&(stat[EFX_MAC_RXDP_SCATTER_DISABLED_TRUNC]),
 	    &value);
+
+	/* Head-of-line blocking */
+	EF10_MAC_STAT_READ(esmp, MC_CMD_MAC_RXDP_HLB_IDLE, &value);
+	EFSYS_STAT_SET_QWORD(&(stat[EFX_MAC_RXDP_HLB_IDLE]), &value);
+
+	EF10_MAC_STAT_READ(esmp, MC_CMD_MAC_RXDP_HLB_TIMEOUT, &value);
+	EFSYS_STAT_SET_QWORD(&(stat[EFX_MAC_RXDP_HLB_TIMEOUT]), &value);
 
 done:
 	/* Read START generation counter */
Index: head/sys/dev/sfxge/common/ef10_nic.c
===================================================================
--- head/sys/dev/sfxge/common/ef10_nic.c
+++ head/sys/dev/sfxge/common/ef10_nic.c
@@ -1272,6 +1272,12 @@
 	else
 		encp->enc_fec_counters = B_FALSE;
 
+	/* Check if the firmware provides head-of-line blocking counters */
+	if (CAP_FLAGS2(req, RXDP_HLB_IDLE))
+		encp->enc_hlb_counters = B_TRUE;
+	else
+		encp->enc_hlb_counters = B_FALSE;
+
 	if (CAP_FLAGS1(req, RX_RSS_LIMITED)) {
 		/* Only one exclusive RSS context is available per port. */
 		encp->enc_rx_scale_max_exclusive_contexts = 1;
Index: head/sys/dev/sfxge/common/efx.h
===================================================================
--- head/sys/dev/sfxge/common/efx.h
+++ head/sys/dev/sfxge/common/efx.h
@@ -1324,6 +1324,7 @@
 	/* Firmware support for extended MAC_STATS buffer */
 	uint32_t		enc_mac_stats_nstats;
 	boolean_t		enc_fec_counters;
+	boolean_t		enc_hlb_counters;
 	/* Firmware support for "FLAG" and "MARK" filter actions */
 	boolean_t		enc_filter_action_flag_supported;
 	boolean_t		enc_filter_action_mark_supported;