Index: head/sys/dev/sfxge/common/efx.h
===================================================================
--- head/sys/dev/sfxge/common/efx.h
+++ head/sys/dev/sfxge/common/efx.h
@@ -1322,6 +1322,13 @@
 efx_nic_cfg_get(
 	__in		efx_nic_t *enp);
 
+/* RxDPCPU firmware id values by which FW variant can be identified */
+#define	EFX_RXDP_FULL_FEATURED_FW_ID	0x0
+#define	EFX_RXDP_LOW_LATENCY_FW_ID	0x1
+#define	EFX_RXDP_PACKED_STREAM_FW_ID	0x2
+#define	EFX_RXDP_RULES_ENGINE_FW_ID	0x5
+#define	EFX_RXDP_DPDK_FW_ID		0x6
+
 typedef struct efx_nic_fw_info_s {
 	/* Basic FW version information */
 	uint16_t	enfi_mc_fw_version[4];
Index: head/sys/dev/sfxge/common/efx_nic.c
===================================================================
--- head/sys/dev/sfxge/common/efx_nic.c
+++ head/sys/dev/sfxge/common/efx_nic.c
@@ -636,6 +636,18 @@
 	EFSYS_ASSERT3U(enp->en_mod_flags, &, EFX_MOD_MCDI);
 	EFSYS_ASSERT3U(enp->en_features, &, EFX_FEATURE_MCDI);
 
+	/* Ensure RXDP_FW_ID codes match with MC_CMD_GET_CAPABILITIES codes */
+	EFX_STATIC_ASSERT(EFX_RXDP_FULL_FEATURED_FW_ID ==
+	    MC_CMD_GET_CAPABILITIES_OUT_RXDP);
+	EFX_STATIC_ASSERT(EFX_RXDP_LOW_LATENCY_FW_ID ==
+	    MC_CMD_GET_CAPABILITIES_OUT_RXDP_LOW_LATENCY);
+	EFX_STATIC_ASSERT(EFX_RXDP_PACKED_STREAM_FW_ID ==
+	    MC_CMD_GET_CAPABILITIES_OUT_RXDP_PACKED_STREAM);
+	EFX_STATIC_ASSERT(EFX_RXDP_RULES_ENGINE_FW_ID ==
+	    MC_CMD_GET_CAPABILITIES_OUT_RXDP_RULES_ENGINE);
+	EFX_STATIC_ASSERT(EFX_RXDP_DPDK_FW_ID ==
+	    MC_CMD_GET_CAPABILITIES_OUT_RXDP_DPDK);
+
 	rc = efx_mcdi_version(enp, mc_fw_version, NULL, NULL);
 	if (rc != 0)
 		goto fail2;