nfp: add 'ethtool --identify' support

Add support for ethtool -p|--identify
by enabling blinking of the panel LED if supported by the NIC firmware.
Signed-off-by: Sixiang Chen <sixiang.chen@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20220622083938.291548-1-simon.horman@corigine.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

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

@@ -1477,6 +1477,38 @@ static void nfp_port_get_pauseparam(struct net_device *netdev,
 	pause->tx_pause = 1;
 }
 
+static int nfp_net_set_phys_id(struct net_device *netdev,
+			       enum ethtool_phys_id_state state)
+{
+	struct nfp_eth_table_port *eth_port;
+	struct nfp_port *port;
+	int err;
+
+	port = nfp_port_from_netdev(netdev);
+	eth_port = __nfp_port_get_eth_port(port);
+	if (!eth_port)
+		return -EOPNOTSUPP;
+
+	switch (state) {
+	case ETHTOOL_ID_ACTIVE:
+		/* Control LED to blink */
+		err = nfp_eth_set_idmode(port->app->cpp, eth_port->index, 1);
+		break;
+
+	case ETHTOOL_ID_INACTIVE:
+		/* Control LED to normal mode */
+		err = nfp_eth_set_idmode(port->app->cpp, eth_port->index, 0);
+		break;
+
+	case ETHTOOL_ID_ON:
+	case ETHTOOL_ID_OFF:
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return err;
+}
+
 static const struct ethtool_ops nfp_net_ethtool_ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES |
@@ -1510,6 +1542,7 @@ static const struct ethtool_ops nfp_net_ethtool_ops = {
 	.get_fecparam		= nfp_port_get_fecparam,
 	.set_fecparam		= nfp_port_set_fecparam,
 	.get_pauseparam		= nfp_port_get_pauseparam,
+	.set_phys_id		= nfp_net_set_phys_id,
 };
 
 const struct ethtool_ops nfp_port_ethtool_ops = {
@@ -1528,6 +1561,7 @@ const struct ethtool_ops nfp_port_ethtool_ops = {
 	.get_fecparam		= nfp_port_get_fecparam,
 	.set_fecparam		= nfp_port_set_fecparam,
 	.get_pauseparam		= nfp_port_get_pauseparam,
+	.set_phys_id		= nfp_net_set_phys_id,
 };
 
 void nfp_net_set_ethtool_ops(struct net_device *netdev)

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

@@ -196,6 +196,8 @@ int nfp_eth_set_configured(struct nfp_cpp *cpp, unsigned int idx,
 int
 nfp_eth_set_fec(struct nfp_cpp *cpp, unsigned int idx, enum nfp_eth_fec mode);
 
+int nfp_eth_set_idmode(struct nfp_cpp *cpp, unsigned int idx, bool state);
+
 static inline bool nfp_eth_can_support_fec(struct nfp_eth_table_port *eth_port)
 {
 	return !!eth_port->fec_modes_supported;

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

@@ -49,6 +49,7 @@
 #define NSP_ETH_CTRL_SET_LANES		BIT_ULL(5)
 #define NSP_ETH_CTRL_SET_ANEG		BIT_ULL(6)
 #define NSP_ETH_CTRL_SET_FEC		BIT_ULL(7)
+#define NSP_ETH_CTRL_SET_IDMODE		BIT_ULL(8)
 
 enum nfp_eth_raw {
 	NSP_ETH_RAW_PORT = 0,
@@ -492,6 +493,35 @@ nfp_eth_set_bit_config(struct nfp_nsp *nsp, unsigned int raw_idx,
 	return 0;
 }
 
+int nfp_eth_set_idmode(struct nfp_cpp *cpp, unsigned int idx, bool state)
+{
+	union eth_table_entry *entries;
+	struct nfp_nsp *nsp;
+	u64 reg;
+
+	nsp = nfp_eth_config_start(cpp, idx);
+	if (IS_ERR(nsp))
+		return PTR_ERR(nsp);
+
+	/* Set this features were added in ABI 0.32 */
+	if (nfp_nsp_get_abi_ver_minor(nsp) < 32) {
+		nfp_err(nfp_nsp_cpp(nsp),
+			"set id mode operation not supported, please update flash\n");
+		return -EOPNOTSUPP;
+	}
+
+	entries = nfp_nsp_config_entries(nsp);
+
+	reg = le64_to_cpu(entries[idx].control);
+	reg &= ~NSP_ETH_CTRL_SET_IDMODE;
+	reg |= FIELD_PREP(NSP_ETH_CTRL_SET_IDMODE, state);
+	entries[idx].control = cpu_to_le64(reg);
+
+	nfp_nsp_config_set_modified(nsp, true);
+
+	return nfp_eth_config_commit_end(nsp);
+}
+
 #define NFP_ETH_SET_BIT_CONFIG(nsp, raw_idx, mask, val, ctrl_bit)	\
 	({								\
 		__BF_FIELD_CHECK(mask, 0ULL, val, "NFP_ETH_SET_BIT_CONFIG: "); \