diff --git a/drivers/common/sfc_efx/base/efx.h b/drivers/common/sfc_efx/base/efx.h
index eea2ce3594..4278b4d66d 100644
--- a/drivers/common/sfc_efx/base/efx.h
+++ b/drivers/common/sfc_efx/base/efx.h
@@ -2487,6 +2487,33 @@ typedef __checkReturn	boolean_t
 
 #endif	/* EFSYS_OPT_MAC_STATS */
 
+#if EFSYS_OPT_DESC_PROXY
+
+/*
+ * NOTE: This callback returns the raw descriptor data, which has not been
+ * converted to host endian. The callback must use the EFX_OWORD macros
+ * to extract the descriptor fields as host endian values.
+ */
+typedef __checkReturn	boolean_t
+(*efx_desc_proxy_txq_desc_ev_t)(
+	__in_opt	void *arg,
+	__in		uint16_t vi_id,
+	__in		efx_oword_t txq_desc);
+
+/*
+ * NOTE: This callback returns the raw descriptor data, which has not been
+ * converted to host endian. The callback must use the EFX_OWORD macros
+ * to extract the descriptor fields as host endian values.
+ */
+typedef __checkReturn	boolean_t
+(*efx_desc_proxy_virtq_desc_ev_t)(
+	__in_opt	void *arg,
+	__in		uint16_t vi_id,
+	__in		uint16_t avail,
+	__in		efx_oword_t virtq_desc);
+
+#endif /* EFSYS_OPT_DESC_PROXY */
+
 typedef struct efx_ev_callbacks_s {
 	efx_initialized_ev_t		eec_initialized;
 	efx_rx_ev_t			eec_rx;
@@ -2511,6 +2538,11 @@ typedef struct efx_ev_callbacks_s {
 #if EFSYS_OPT_MAC_STATS
 	efx_mac_stats_ev_t		eec_mac_stats;
 #endif	/* EFSYS_OPT_MAC_STATS */
+#if EFSYS_OPT_DESC_PROXY
+	efx_desc_proxy_txq_desc_ev_t	eec_desc_proxy_txq_desc;
+	efx_desc_proxy_virtq_desc_ev_t	eec_desc_proxy_virtq_desc;
+#endif /* EFSYS_OPT_DESC_PROXY */
+
 } efx_ev_callbacks_t;
 
 LIBEFX_API
diff --git a/drivers/common/sfc_efx/base/efx_impl.h b/drivers/common/sfc_efx/base/efx_impl.h
index f58586bee0..196fd4a79c 100644
--- a/drivers/common/sfc_efx/base/efx_impl.h
+++ b/drivers/common/sfc_efx/base/efx_impl.h
@@ -902,6 +902,11 @@ struct efx_nic_s {
 typedef	boolean_t (*efx_ev_handler_t)(efx_evq_t *, efx_qword_t *,
     const efx_ev_callbacks_t *, void *);
 
+#if EFSYS_OPT_EV_EXTENDED_WIDTH
+typedef	boolean_t (*efx_ev_ew_handler_t)(efx_evq_t *, efx_xword_t *,
+    const efx_ev_callbacks_t *, void *);
+#endif /* EFSYS_OPT_EV_EXTENDED_WIDTH */
+
 typedef struct efx_evq_rxq_state_s {
 	unsigned int			eers_rx_read_ptr;
 	unsigned int			eers_rx_mask;
@@ -934,6 +939,11 @@ struct efx_evq_s {
 	efx_ev_handler_t		ee_mcdi;
 #endif	/* EFSYS_OPT_MCDI */
 
+#if EFSYS_OPT_DESC_PROXY
+	efx_ev_ew_handler_t		ee_ew_txq_desc;
+	efx_ev_ew_handler_t		ee_ew_virtq_desc;
+#endif /* EFSYS_OPT_DESC_PROXY */
+
 	efx_evq_rxq_state_t		ee_rxq_state[EFX_EV_RX_NLABELS];
 };
 
diff --git a/drivers/common/sfc_efx/base/rhead_ev.c b/drivers/common/sfc_efx/base/rhead_ev.c
index 5bda315171..2b5635f1cd 100644
--- a/drivers/common/sfc_efx/base/rhead_ev.c
+++ b/drivers/common/sfc_efx/base/rhead_ev.c
@@ -58,6 +58,22 @@ rhead_ev_ew_qpoll(
 	__inout		unsigned int *countp,
 	__in		const efx_ev_callbacks_t *eecp,
 	__in_opt	void *arg);
+
+#if EFSYS_OPT_DESC_PROXY
+static			boolean_t
+rhead_ev_ew_txq_desc(
+	__in		efx_evq_t *eep,
+	__in		efx_xword_t *eventp,
+	__in		const efx_ev_callbacks_t *eecp,
+	__in_opt	void *arg);
+
+static			boolean_t
+rhead_ev_ew_virtq_desc(
+	__in		efx_evq_t *eep,
+	__in		efx_xword_t *eventp,
+	__in		const efx_ev_callbacks_t *eecp,
+	__in_opt	void *arg);
+#endif /* EFSYS_OPT_DESC_PROXY */
 #endif /* EFSYS_OPT_EV_EXTENDED_WIDTH */
 
 
@@ -115,6 +131,11 @@ rhead_ev_qcreate(
 	eep->ee_drv_gen	= NULL; /* FIXME */
 	eep->ee_mcdi	= rhead_ev_mcdi;
 
+#if EFSYS_OPT_DESC_PROXY
+	eep->ee_ew_txq_desc	= rhead_ev_ew_txq_desc;
+	eep->ee_ew_virtq_desc	= rhead_ev_ew_virtq_desc;
+#endif /* EFSYS_OPT_DESC_PROXY */
+
 	/* Set up the event queue */
 	/* INIT_EVQ expects function-relative vector number */
 	if ((flags & EFX_EVQ_FLAGS_NOTIFY_MASK) ==
@@ -345,6 +366,16 @@ rhead_ev_ew_dispatch(
 		    rhead_ev_dispatch(eep, &eventp->ex_qword[0], eecp, arg);
 		break;
 
+#if EFSYS_OPT_DESC_PROXY
+	case ESE_GZ_EF100_EVEW_TXQ_DESC:
+		should_abort = eep->ee_ew_txq_desc(eep, eventp, eecp, arg);
+		break;
+
+	case ESE_GZ_EF100_EVEW_VIRTQ_DESC:
+		should_abort = eep->ee_ew_virtq_desc(eep, eventp, eecp, arg);
+		break;
+#endif /* EFSYS_OPT_DESC_PROXY */
+
 	default:
 		/* Omit currently unused reserved bits from the probe. */
 		EFSYS_PROBE7(ew_bad_event, unsigned int, eep->ee_index,
@@ -589,4 +620,68 @@ rhead_ev_mcdi(
 	return (ret);
 }
 
+#if EFSYS_OPT_DESC_PROXY
+static			boolean_t
+rhead_ev_ew_txq_desc(
+	__in		efx_evq_t *eep,
+	__in		efx_xword_t *eventp,
+	__in		const efx_ev_callbacks_t *eecp,
+	__in_opt	void *arg)
+{
+	efx_oword_t txq_desc;
+	uint16_t vi_id;
+	boolean_t should_abort;
+
+	_NOTE(ARGUNUSED(eep))
+
+	vi_id = EFX_XWORD_FIELD(*eventp, ESF_GZ_EV_TXQ_DP_VI_ID);
+
+	/*
+	 * NOTE: This is the raw descriptor data, and has not been converted
+	 * to host endian. The handler callback must use the EFX_OWORD macros
+	 * to extract the descriptor fields as host endian values.
+	 */
+	txq_desc = eventp->ex_oword[0];
+
+	EFSYS_ASSERT(eecp->eec_desc_proxy_txq_desc != NULL);
+	should_abort = eecp->eec_desc_proxy_txq_desc(arg, vi_id, txq_desc);
+
+	return (should_abort);
+}
+#endif /* EFSYS_OPT_DESC_PROXY */
+
+
+#if EFSYS_OPT_DESC_PROXY
+static			boolean_t
+rhead_ev_ew_virtq_desc(
+	__in		efx_evq_t *eep,
+	__in		efx_xword_t *eventp,
+	__in		const efx_ev_callbacks_t *eecp,
+	__in_opt	void *arg)
+{
+	efx_oword_t virtq_desc;
+	uint16_t vi_id;
+	uint16_t avail;
+	boolean_t should_abort;
+
+	_NOTE(ARGUNUSED(eep))
+
+	vi_id = EFX_XWORD_FIELD(*eventp, ESF_GZ_EV_VQ_DP_VI_ID);
+	avail = EFX_XWORD_FIELD(*eventp, ESF_GZ_EV_VQ_DP_AVAIL_ENTRY);
+
+	/*
+	 * NOTE: This is the raw descriptor data, and has not been converted
+	 * to host endian. The handler callback must use the EFX_OWORD macros
+	 * to extract the descriptor fields as host endian values.
+	 */
+	virtq_desc = eventp->ex_oword[0];
+
+	EFSYS_ASSERT(eecp->eec_desc_proxy_virtq_desc != NULL);
+	should_abort =
+	    eecp->eec_desc_proxy_virtq_desc(arg, vi_id, avail, virtq_desc);
+
+	return (should_abort);
+}
+#endif /* EFSYS_OPT_DESC_PROXY */
+
 #endif	/* EFSYS_OPT_RIVERHEAD */
