nfp: add support for reporting active FEC mode

The latest management firmware can now report the active FEC
mode. Adapt driver accordingly so that user can get the active
FEC mode by running command:

  # ethtool --show-fec <intf>

Also correct use of `fec` field.
Signed-off-by: Yinjun Zhang <yinjun.zhang@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/netronome/nfp/nfp_net_ethtool.c

@@ -996,7 +996,7 @@ nfp_port_get_fecparam(struct net_device *netdev,
 		return 0;
 
 	param->fec = nfp_port_fec_nsp_to_ethtool(eth_port->fec_modes_supported);
-	param->active_fec = nfp_port_fec_nsp_to_ethtool(eth_port->fec);
+	param->active_fec = nfp_port_fec_nsp_to_ethtool(BIT(eth_port->act_fec));
 
 	return 0;
 }

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h

@@ -132,6 +132,7 @@ enum nfp_eth_fec {
  * @ports.interface:	interface (module) plugged in
  * @ports.media:	media type of the @interface
  * @ports.fec:		forward error correction mode
+ * @ports.act_fec:	active forward error correction mode
  * @ports.aneg:		auto negotiation mode
  * @ports.mac_addr:	interface MAC address
  * @ports.label_port:	port id
@@ -162,6 +163,7 @@ struct nfp_eth_table {
 		enum nfp_eth_media media;
 
 		enum nfp_eth_fec fec;
+		enum nfp_eth_fec act_fec;
 		enum nfp_eth_aneg aneg;
 
 		u8 mac_addr[ETH_ALEN];

drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp_eth.c

@@ -40,6 +40,7 @@
 #define NSP_ETH_STATE_OVRD_CHNG		BIT_ULL(22)
 #define NSP_ETH_STATE_ANEG		GENMASK_ULL(25, 23)
 #define NSP_ETH_STATE_FEC		GENMASK_ULL(27, 26)
+#define NSP_ETH_STATE_ACT_FEC		GENMASK_ULL(29, 28)
 
 #define NSP_ETH_CTRL_CONFIGURED		BIT_ULL(0)
 #define NSP_ETH_CTRL_ENABLED		BIT_ULL(1)
@@ -170,7 +171,13 @@ nfp_eth_port_translate(struct nfp_nsp *nsp, const union eth_table_entry *src,
 	if (dst->fec_modes_supported)
 		dst->fec_modes_supported |= NFP_FEC_AUTO | NFP_FEC_DISABLED;
 
-	dst->fec = 1 << FIELD_GET(NSP_ETH_STATE_FEC, state);
+	dst->fec = FIELD_GET(NSP_ETH_STATE_FEC, state);
+	dst->act_fec = dst->fec;
+
+	if (nfp_nsp_get_abi_ver_minor(nsp) < 33)
+		return;
+
+	dst->act_fec = FIELD_GET(NSP_ETH_STATE_ACT_FEC, state);
 }
 
 static void