Index: head/sys/dev/sfxge/common/efx.h
===================================================================
--- head/sys/dev/sfxge/common/efx.h
+++ head/sys/dev/sfxge/common/efx.h
@@ -1173,6 +1173,7 @@
 	/* Datapath firmware vadapter/vport/vswitch support */
 	boolean_t		enc_datapath_cap_evb;
 	boolean_t               enc_rx_disable_scatter_supported;
+	boolean_t               enc_allow_set_mac_with_installed_filters;
 	/* External port identifier */
 	uint8_t			enc_external_port;
 } efx_nic_cfg_t;
Index: head/sys/dev/sfxge/common/hunt_nic.c
===================================================================
--- head/sys/dev/sfxge/common/hunt_nic.c
+++ head/sys/dev/sfxge/common/hunt_nic.c
@@ -149,6 +149,9 @@
 	req.emr_out_length = MC_CMD_VADAPTOR_ALLOC_OUT_LEN;
 
 	MCDI_IN_SET_DWORD(req, VADAPTOR_ALLOC_IN_UPSTREAM_PORT_ID, port_id);
+	MCDI_IN_POPULATE_DWORD_1(req, VADAPTOR_ALLOC_IN_FLAGS,
+	    VADAPTOR_ALLOC_IN_FLAG_PERMIT_SET_MAC_WHEN_FILTERS_INSTALLED,
+	    enp->en_nic_cfg.enc_allow_set_mac_with_installed_filters ? 1 : 0);
 
 	efx_mcdi_execute(enp, &req);
 
@@ -928,6 +931,15 @@
 		encp->enc_rx_disable_scatter_supported = B_FALSE;
 	}
 
+	/* Check if the firmware supports set mac with running filters */
+	if (MCDI_CMD_DWORD_FIELD(&datapath_capabilities,
+	    GET_CAPABILITIES_OUT_VADAPTOR_PERMIT_SET_MAC_WHEN_FILTERS_INSTALLED)
+	    == 1) {
+		encp->enc_allow_set_mac_with_installed_filters = B_TRUE;
+	} else {
+		encp->enc_allow_set_mac_with_installed_filters = B_FALSE;
+	}
+
 	return (0);
 
 fail2:
Index: head/sys/dev/sfxge/common/siena_nic.c
===================================================================
--- head/sys/dev/sfxge/common/siena_nic.c
+++ head/sys/dev/sfxge/common/siena_nic.c
@@ -170,6 +170,7 @@
 
 	encp->enc_hw_tx_insert_vlan_enabled = B_FALSE;
 	encp->enc_fw_assisted_tso_enabled = B_FALSE;
+	encp->enc_allow_set_mac_with_installed_filters = B_TRUE;
 
 	return (0);