octeontx2-pf: ethtool physical link status

Register get_link_ksettings callback to get link status information
from the driver. As virtual function (vf) shares same physical link
same API is used for both the drivers and for loop back drivers
simply returns the fixed values as its does not have physical link.

ethtool eth3
Settings for eth3:
        Supported ports: [ ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
                                10000baseKR/Full
                                1000baseX/Full
        Supports auto-negotiation: No
        Supported FEC modes: BaseR RS
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Advertised FEC modes: None

ethtool lbk0
Settings for lbk0:
	Speed: 100000Mb/s
        Duplex: Full
Signed-off-by: NChristina Jacob <cjacob@marvell.com>
Signed-off-by: NSunil Goutham <sgoutham@marvell.com>
Signed-off-by: NHariprasad Kelam <hkelam@marvell.com>
Reviewed-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c

@@ -14,6 +14,7 @@
 #include <linux/etherdevice.h>
 #include <linux/log2.h>
 #include <linux/net_tstamp.h>
+#include <linux/linkmode.h>
 
 #include "otx2_common.h"
 #include "otx2_ptp.h"
@@ -32,6 +33,14 @@ struct otx2_stat {
 	.index = offsetof(struct otx2_dev_stats, stat) / sizeof(u64), \
 }
 
+/* Physical link config */
+#define OTX2_ETHTOOL_SUPPORTED_MODES 0x638CCBF //110001110001100110010111111
+
+enum link_mode {
+	OTX2_MODE_SUPPORTED,
+	OTX2_MODE_ADVERTISED
+};
+
 static const struct otx2_stat otx2_dev_stats[] = {
 	OTX2_DEV_STAT(rx_ucast_frames),
 	OTX2_DEV_STAT(rx_bcast_frames),
@@ -1015,6 +1024,139 @@ static int otx2_set_fecparam(struct net_device *netdev,
 	return err;
 }
 
+static void otx2_get_fec_info(u64 index, int req_mode,
+			      struct ethtool_link_ksettings *link_ksettings)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(otx2_fec_modes) = { 0, };
+
+	switch (index) {
+	case OTX2_FEC_NONE:
+		linkmode_set_bit(ETHTOOL_LINK_MODE_FEC_NONE_BIT,
+				 otx2_fec_modes);
+		break;
+	case OTX2_FEC_BASER:
+		linkmode_set_bit(ETHTOOL_LINK_MODE_FEC_BASER_BIT,
+				 otx2_fec_modes);
+		break;
+	case OTX2_FEC_RS:
+		linkmode_set_bit(ETHTOOL_LINK_MODE_FEC_RS_BIT,
+				 otx2_fec_modes);
+		break;
+	case OTX2_FEC_BASER | OTX2_FEC_RS:
+		linkmode_set_bit(ETHTOOL_LINK_MODE_FEC_BASER_BIT,
+				 otx2_fec_modes);
+		linkmode_set_bit(ETHTOOL_LINK_MODE_FEC_RS_BIT,
+				 otx2_fec_modes);
+		break;
+	}
+
+	/* Add fec modes to existing modes */
+	if (req_mode == OTX2_MODE_ADVERTISED)
+		linkmode_or(link_ksettings->link_modes.advertising,
+			    link_ksettings->link_modes.advertising,
+			    otx2_fec_modes);
+	else
+		linkmode_or(link_ksettings->link_modes.supported,
+			    link_ksettings->link_modes.supported,
+			    otx2_fec_modes);
+}
+
+static void otx2_get_link_mode_info(u64 link_mode_bmap,
+				    bool req_mode,
+				    struct ethtool_link_ksettings
+				    *link_ksettings)
+{
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(otx2_link_modes) = { 0, };
+	const int otx2_sgmii_features[6] = {
+		ETHTOOL_LINK_MODE_10baseT_Half_BIT,
+		ETHTOOL_LINK_MODE_10baseT_Full_BIT,
+		ETHTOOL_LINK_MODE_100baseT_Half_BIT,
+		ETHTOOL_LINK_MODE_100baseT_Full_BIT,
+		ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
+		ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+	};
+	/* CGX link modes to Ethtool link mode mapping */
+	const int cgx_link_mode[27] = {
+		0, /* SGMII  Mode */
+		ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+		ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
+		ETHTOOL_LINK_MODE_10000baseSR_Full_BIT,
+		ETHTOOL_LINK_MODE_10000baseLR_Full_BIT,
+		ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
+		0,
+		ETHTOOL_LINK_MODE_25000baseSR_Full_BIT,
+		0,
+		0,
+		ETHTOOL_LINK_MODE_25000baseCR_Full_BIT,
+		ETHTOOL_LINK_MODE_25000baseKR_Full_BIT,
+		ETHTOOL_LINK_MODE_40000baseSR4_Full_BIT,
+		ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT,
+		ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT,
+		ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT,
+		0,
+		ETHTOOL_LINK_MODE_50000baseSR_Full_BIT,
+		0,
+		ETHTOOL_LINK_MODE_50000baseLR_ER_FR_Full_BIT,
+		ETHTOOL_LINK_MODE_50000baseCR_Full_BIT,
+		ETHTOOL_LINK_MODE_50000baseKR_Full_BIT,
+		0,
+		ETHTOOL_LINK_MODE_100000baseSR4_Full_BIT,
+		ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT,
+		ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT,
+		ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT
+	};
+	u8 bit;
+
+	link_mode_bmap = link_mode_bmap & OTX2_ETHTOOL_SUPPORTED_MODES;
+
+	for_each_set_bit(bit, (unsigned long *)&link_mode_bmap, 27) {
+		/* SGMII mode is set */
+		if (bit == 0)
+			linkmode_set_bit_array(otx2_sgmii_features,
+					       ARRAY_SIZE(otx2_sgmii_features),
+					       otx2_link_modes);
+		else
+			linkmode_set_bit(cgx_link_mode[bit], otx2_link_modes);
+	}
+
+	if (req_mode == OTX2_MODE_ADVERTISED)
+		linkmode_copy(link_ksettings->link_modes.advertising,
+			      otx2_link_modes);
+	else
+		linkmode_copy(link_ksettings->link_modes.supported,
+			      otx2_link_modes);
+}
+
+static int otx2_get_link_ksettings(struct net_device *netdev,
+				   struct ethtool_link_ksettings *cmd)
+{
+	struct otx2_nic *pfvf = netdev_priv(netdev);
+	struct cgx_fw_data *rsp = NULL;
+
+	cmd->base.duplex  = pfvf->linfo.full_duplex;
+	cmd->base.speed   = pfvf->linfo.speed;
+	cmd->base.autoneg = pfvf->linfo.an;
+
+	rsp = otx2_get_fwdata(pfvf);
+	if (IS_ERR(rsp))
+		return PTR_ERR(rsp);
+
+	if (rsp->fwdata.supported_an)
+		ethtool_link_ksettings_add_link_mode(cmd,
+						     supported,
+						     Autoneg);
+
+	otx2_get_link_mode_info(rsp->fwdata.advertised_link_modes,
+				OTX2_MODE_ADVERTISED, cmd);
+	otx2_get_fec_info(rsp->fwdata.advertised_fec,
+			  OTX2_MODE_ADVERTISED, cmd);
+	otx2_get_link_mode_info(rsp->fwdata.supported_link_modes,
+				OTX2_MODE_SUPPORTED, cmd);
+	otx2_get_fec_info(rsp->fwdata.supported_fec,
+			  OTX2_MODE_SUPPORTED, cmd);
+	return 0;
+}
+
 static const struct ethtool_ops otx2_ethtool_ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES,
@@ -1044,6 +1186,7 @@ static const struct ethtool_ops otx2_ethtool_ops = {
 	.get_ts_info		= otx2_get_ts_info,
 	.get_fecparam		= otx2_get_fecparam,
 	.set_fecparam		= otx2_set_fecparam,
+	.get_link_ksettings     = otx2_get_link_ksettings,
 };
 
 void otx2_set_ethtool_ops(struct net_device *netdev)
@@ -1118,6 +1261,20 @@ static int otx2vf_get_sset_count(struct net_device *netdev, int sset)
 	return otx2_n_dev_stats + otx2_n_drv_stats + qstats_count + 1;
 }
 
+static int otx2vf_get_link_ksettings(struct net_device *netdev,
+				     struct ethtool_link_ksettings *cmd)
+{
+	struct otx2_nic *pfvf = netdev_priv(netdev);
+
+	if (is_otx2_lbkvf(pfvf->pdev)) {
+		cmd->base.duplex = DUPLEX_FULL;
+		cmd->base.speed = SPEED_100000;
+	} else {
+		return otx2_get_link_ksettings(netdev, cmd);
+	}
+	return 0;
+}
+
 static const struct ethtool_ops otx2vf_ethtool_ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES,
@@ -1144,6 +1301,7 @@ static const struct ethtool_ops otx2vf_ethtool_ops = {
 	.set_msglevel		= otx2_set_msglevel,
 	.get_pauseparam		= otx2_get_pauseparam,
 	.set_pauseparam		= otx2_set_pauseparam,
+	.get_link_ksettings     = otx2vf_get_link_ksettings,
 };
 
 void otx2vf_set_ethtool_ops(struct net_device *netdev)