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
@@ -1075,6 +1075,16 @@
 	encp->enc_mac_stats_40g_tx_size_bins =
 	    CAP_FLAG2(flags2, MAC_STATS_40G_TX_SIZE_BINS) ? B_TRUE : B_FALSE;
 
+	/*
+	 * Check if firmware supports VXLAN and NVGRE tunnels.
+	 * The capability indicates Geneve protocol support as well.
+	 */
+	if (CAP_FLAG(flags, VXLAN_NVGRE))
+		encp->enc_tunnel_encapsulations_supported =
+		    (1u << EFX_TUNNEL_PROTOCOL_VXLAN) |
+		    (1u << EFX_TUNNEL_PROTOCOL_GENEVE) |
+		    (1u << EFX_TUNNEL_PROTOCOL_NVGRE);
+
 #undef CAP_FLAG
 #undef CAP_FLAG2
 
Index: head/sys/dev/sfxge/common/efx.h
===================================================================
--- head/sys/dev/sfxge/common/efx.h
+++ head/sys/dev/sfxge/common/efx.h
@@ -1095,6 +1095,14 @@
 #define	EFX_FEATURE_FW_ASSISTED_TSO_V2	0x00002000
 #define	EFX_FEATURE_PACKED_STREAM	0x00004000
 
+typedef enum efx_tunnel_protocol_e {
+	EFX_TUNNEL_PROTOCOL_NONE = 0,
+	EFX_TUNNEL_PROTOCOL_VXLAN,
+	EFX_TUNNEL_PROTOCOL_GENEVE,
+	EFX_TUNNEL_PROTOCOL_NVGRE,
+	EFX_TUNNEL_NPROTOS
+} efx_tunnel_protocol_t;
+
 typedef struct efx_nic_cfg_s {
 	uint32_t		enc_board_type;
 	uint32_t		enc_phy_type;
@@ -1194,6 +1202,7 @@
 	boolean_t		enc_rx_var_packed_stream_supported;
 	boolean_t		enc_pm_and_rxdp_counters;
 	boolean_t		enc_mac_stats_40g_tx_size_bins;
+	uint32_t		enc_tunnel_encapsulations_supported;
 	/* External port identifier */
 	uint8_t			enc_external_port;
 	uint32_t		enc_mcdi_max_payload_length;