bnxt_en: add infrastructure to lookup ethtool link mode

Add infrastructure to look up the enum ethtool_link_mode_bit_indices
from link information provided by the firmware.  The link speed,
signal mode, and media type returned by firmware will be used to
look up the ethtool link mode.

The immediate benefit is that once the link mode is determined, we can
now use ethtool_params_from_link_mode() to fill the basic ethtool
parameters including the number of lanes.  Lanes will be fully
supported in the next patch.
Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1295,6 +1295,7 @@ struct bnxt_link_info {
 	u8			req_signal_mode;
 #define BNXT_SIG_MODE_NRZ	PORT_PHY_QCFG_RESP_SIGNAL_MODE_NRZ
 #define BNXT_SIG_MODE_PAM4	PORT_PHY_QCFG_RESP_SIGNAL_MODE_PAM4
+#define BNXT_SIG_MODE_MAX	(PORT_PHY_QCFG_RESP_SIGNAL_MODE_LAST + 1)
 	u8			req_duplex;
 	u8			req_flow_ctrl;
 	u16			req_link_speed;

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -1506,6 +1506,230 @@ u32 _bnxt_fw_to_ethtool_adv_spds(u16 fw_speeds, u8 fw_pause)
 	return speed_mask;
 }
 
+enum bnxt_media_type {
+	BNXT_MEDIA_UNKNOWN = 0,
+	BNXT_MEDIA_TP,
+	BNXT_MEDIA_CR,
+	BNXT_MEDIA_SR,
+	BNXT_MEDIA_LR_ER_FR,
+	BNXT_MEDIA_KR,
+	BNXT_MEDIA_KX,
+	BNXT_MEDIA_X,
+	__BNXT_MEDIA_END,
+};
+
+static const enum bnxt_media_type bnxt_phy_types[] = {
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_BASECR] = BNXT_MEDIA_CR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_BASEKR4] =  BNXT_MEDIA_KR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_BASELR] = BNXT_MEDIA_LR_ER_FR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_BASESR] = BNXT_MEDIA_SR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_BASEKR2] = BNXT_MEDIA_KR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_BASEKX] = BNXT_MEDIA_KX,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_BASEKR] = BNXT_MEDIA_KR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_BASET] = BNXT_MEDIA_TP,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_BASETE] = BNXT_MEDIA_TP,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_25G_BASECR_CA_L] = BNXT_MEDIA_CR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_25G_BASECR_CA_S] = BNXT_MEDIA_CR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_25G_BASECR_CA_N] = BNXT_MEDIA_CR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_25G_BASESR] = BNXT_MEDIA_SR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_100G_BASECR4] = BNXT_MEDIA_CR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_100G_BASESR4] = BNXT_MEDIA_SR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_100G_BASELR4] = BNXT_MEDIA_LR_ER_FR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_100G_BASEER4] = BNXT_MEDIA_LR_ER_FR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_100G_BASESR10] = BNXT_MEDIA_SR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_40G_BASECR4] = BNXT_MEDIA_CR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_40G_BASESR4] = BNXT_MEDIA_SR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_40G_BASELR4] = BNXT_MEDIA_LR_ER_FR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_40G_BASEER4] = BNXT_MEDIA_LR_ER_FR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_40G_ACTIVE_CABLE] = BNXT_MEDIA_SR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_1G_BASET] = BNXT_MEDIA_TP,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_1G_BASESX] = BNXT_MEDIA_X,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_1G_BASECX] = BNXT_MEDIA_X,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_200G_BASECR4] = BNXT_MEDIA_CR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_200G_BASESR4] = BNXT_MEDIA_SR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_200G_BASELR4] = BNXT_MEDIA_LR_ER_FR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_200G_BASEER4] = BNXT_MEDIA_LR_ER_FR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_50G_BASECR] = BNXT_MEDIA_CR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_50G_BASESR] = BNXT_MEDIA_SR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_50G_BASELR] = BNXT_MEDIA_LR_ER_FR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_50G_BASEER] = BNXT_MEDIA_LR_ER_FR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_100G_BASECR2] = BNXT_MEDIA_CR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_100G_BASESR2] = BNXT_MEDIA_SR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_100G_BASELR2] = BNXT_MEDIA_LR_ER_FR,
+	[PORT_PHY_QCFG_RESP_PHY_TYPE_100G_BASEER2] = BNXT_MEDIA_LR_ER_FR,
+};
+
+static enum bnxt_media_type
+bnxt_get_media(struct bnxt_link_info *link_info)
+{
+	switch (link_info->media_type) {
+	case PORT_PHY_QCFG_RESP_MEDIA_TYPE_TP:
+		return BNXT_MEDIA_TP;
+	case PORT_PHY_QCFG_RESP_MEDIA_TYPE_DAC:
+		return BNXT_MEDIA_CR;
+	default:
+		if (link_info->phy_type < ARRAY_SIZE(bnxt_phy_types))
+			return bnxt_phy_types[link_info->phy_type];
+		return BNXT_MEDIA_UNKNOWN;
+	}
+}
+
+enum bnxt_link_speed_indices {
+	BNXT_LINK_SPEED_UNKNOWN = 0,
+	BNXT_LINK_SPEED_100MB_IDX,
+	BNXT_LINK_SPEED_1GB_IDX,
+	BNXT_LINK_SPEED_10GB_IDX,
+	BNXT_LINK_SPEED_25GB_IDX,
+	BNXT_LINK_SPEED_40GB_IDX,
+	BNXT_LINK_SPEED_50GB_IDX,
+	BNXT_LINK_SPEED_100GB_IDX,
+	BNXT_LINK_SPEED_200GB_IDX,
+	__BNXT_LINK_SPEED_END
+};
+
+static enum bnxt_link_speed_indices bnxt_fw_speed_idx(u16 speed)
+{
+	switch (speed) {
+	case BNXT_LINK_SPEED_100MB: return BNXT_LINK_SPEED_100MB_IDX;
+	case BNXT_LINK_SPEED_1GB: return BNXT_LINK_SPEED_1GB_IDX;
+	case BNXT_LINK_SPEED_10GB: return BNXT_LINK_SPEED_10GB_IDX;
+	case BNXT_LINK_SPEED_25GB: return BNXT_LINK_SPEED_25GB_IDX;
+	case BNXT_LINK_SPEED_40GB: return BNXT_LINK_SPEED_40GB_IDX;
+	case BNXT_LINK_SPEED_50GB: return BNXT_LINK_SPEED_50GB_IDX;
+	case BNXT_LINK_SPEED_100GB: return BNXT_LINK_SPEED_100GB_IDX;
+	case BNXT_LINK_SPEED_200GB: return BNXT_LINK_SPEED_200GB_IDX;
+	default: return BNXT_LINK_SPEED_UNKNOWN;
+	}
+}
+
+static const enum ethtool_link_mode_bit_indices
+bnxt_link_modes[__BNXT_LINK_SPEED_END][BNXT_SIG_MODE_MAX][__BNXT_MEDIA_END] = {
+	[BNXT_LINK_SPEED_100MB_IDX] = {
+		{
+			[BNXT_MEDIA_TP] = ETHTOOL_LINK_MODE_100baseT_Full_BIT,
+		},
+	},
+	[BNXT_LINK_SPEED_1GB_IDX] = {
+		{
+			[BNXT_MEDIA_TP] = ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+			/* historically baseT, but DAC is more correctly baseX */
+			[BNXT_MEDIA_CR] = ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+			[BNXT_MEDIA_KX] = ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
+			[BNXT_MEDIA_X] = ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+			[BNXT_MEDIA_KR] = ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
+		},
+	},
+	[BNXT_LINK_SPEED_10GB_IDX] = {
+		{
+			[BNXT_MEDIA_TP] = ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
+			[BNXT_MEDIA_CR] = ETHTOOL_LINK_MODE_10000baseCR_Full_BIT,
+			[BNXT_MEDIA_SR] = ETHTOOL_LINK_MODE_10000baseSR_Full_BIT,
+			[BNXT_MEDIA_LR_ER_FR] = ETHTOOL_LINK_MODE_10000baseLR_Full_BIT,
+			[BNXT_MEDIA_KR] = ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
+			[BNXT_MEDIA_KX] = ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
+		},
+	},
+	[BNXT_LINK_SPEED_25GB_IDX] = {
+		{
+			[BNXT_MEDIA_CR] = ETHTOOL_LINK_MODE_25000baseCR_Full_BIT,
+			[BNXT_MEDIA_SR] = ETHTOOL_LINK_MODE_25000baseSR_Full_BIT,
+			[BNXT_MEDIA_KR] = ETHTOOL_LINK_MODE_25000baseKR_Full_BIT,
+		},
+	},
+	[BNXT_LINK_SPEED_40GB_IDX] = {
+		{
+			[BNXT_MEDIA_CR] = ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT,
+			[BNXT_MEDIA_SR] = ETHTOOL_LINK_MODE_40000baseSR4_Full_BIT,
+			[BNXT_MEDIA_LR_ER_FR] = ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT,
+			[BNXT_MEDIA_KR] = ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT,
+		},
+	},
+	[BNXT_LINK_SPEED_50GB_IDX] = {
+		[BNXT_SIG_MODE_NRZ] = {
+			[BNXT_MEDIA_CR] = ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT,
+			[BNXT_MEDIA_SR] = ETHTOOL_LINK_MODE_50000baseSR2_Full_BIT,
+			[BNXT_MEDIA_KR] = ETHTOOL_LINK_MODE_50000baseKR2_Full_BIT,
+		},
+		[BNXT_SIG_MODE_PAM4] = {
+			[BNXT_MEDIA_CR] = ETHTOOL_LINK_MODE_50000baseCR_Full_BIT,
+			[BNXT_MEDIA_SR] = ETHTOOL_LINK_MODE_50000baseSR_Full_BIT,
+			[BNXT_MEDIA_LR_ER_FR] = ETHTOOL_LINK_MODE_50000baseLR_ER_FR_Full_BIT,
+			[BNXT_MEDIA_KR] = ETHTOOL_LINK_MODE_50000baseKR_Full_BIT,
+		},
+	},
+	[BNXT_LINK_SPEED_100GB_IDX] = {
+		[BNXT_SIG_MODE_NRZ] = {
+			[BNXT_MEDIA_CR] = ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT,
+			[BNXT_MEDIA_SR] = ETHTOOL_LINK_MODE_100000baseSR4_Full_BIT,
+			[BNXT_MEDIA_LR_ER_FR] = ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT,
+			[BNXT_MEDIA_KR] = ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT,
+		},
+		[BNXT_SIG_MODE_PAM4] = {
+			[BNXT_MEDIA_CR] = ETHTOOL_LINK_MODE_100000baseCR2_Full_BIT,
+			[BNXT_MEDIA_SR] = ETHTOOL_LINK_MODE_100000baseSR2_Full_BIT,
+			[BNXT_MEDIA_LR_ER_FR] = ETHTOOL_LINK_MODE_100000baseLR2_ER2_FR2_Full_BIT,
+			[BNXT_MEDIA_KR] = ETHTOOL_LINK_MODE_100000baseKR2_Full_BIT,
+		},
+	},
+	[BNXT_LINK_SPEED_200GB_IDX] = {
+		[BNXT_SIG_MODE_PAM4] = {
+			[BNXT_MEDIA_CR] = ETHTOOL_LINK_MODE_200000baseCR4_Full_BIT,
+			[BNXT_MEDIA_SR] = ETHTOOL_LINK_MODE_200000baseSR4_Full_BIT,
+			[BNXT_MEDIA_LR_ER_FR] = ETHTOOL_LINK_MODE_200000baseLR4_ER4_FR4_Full_BIT,
+			[BNXT_MEDIA_KR] = ETHTOOL_LINK_MODE_200000baseKR4_Full_BIT,
+		},
+	},
+};
+
+#define BNXT_LINK_MODE_UNKNOWN -1
+
+static enum ethtool_link_mode_bit_indices
+bnxt_get_link_mode(struct bnxt_link_info *link_info)
+{
+	enum ethtool_link_mode_bit_indices link_mode;
+	enum bnxt_link_speed_indices speed;
+	enum bnxt_media_type media;
+	u8 sig_mode;
+
+	if (link_info->phy_link_status != BNXT_LINK_LINK)
+		return BNXT_LINK_MODE_UNKNOWN;
+
+	media = bnxt_get_media(link_info);
+	if (BNXT_AUTO_MODE(link_info->auto_mode)) {
+		speed = bnxt_fw_speed_idx(link_info->link_speed);
+		sig_mode = link_info->active_fec_sig_mode &
+			PORT_PHY_QCFG_RESP_SIGNAL_MODE_MASK;
+	} else {
+		speed = bnxt_fw_speed_idx(link_info->req_link_speed);
+		sig_mode = link_info->req_signal_mode;
+	}
+	if (sig_mode >= BNXT_SIG_MODE_MAX)
+		return BNXT_LINK_MODE_UNKNOWN;
+
+	/* Note ETHTOOL_LINK_MODE_10baseT_Half_BIT == 0 is a legal Linux
+	 * link mode, but since no such devices exist, the zeroes in the
+	 * map can be conveniently used to represent unknown link modes.
+	 */
+	link_mode = bnxt_link_modes[speed][sig_mode][media];
+	if (!link_mode)
+		return BNXT_LINK_MODE_UNKNOWN;
+
+	switch (link_mode) {
+	case ETHTOOL_LINK_MODE_100baseT_Full_BIT:
+		if (~link_info->duplex & BNXT_LINK_DUPLEX_FULL)
+			link_mode = ETHTOOL_LINK_MODE_100baseT_Half_BIT;
+		break;
+	case ETHTOOL_LINK_MODE_1000baseT_Full_BIT:
+		if (~link_info->duplex & BNXT_LINK_DUPLEX_FULL)
+			link_mode = ETHTOOL_LINK_MODE_1000baseT_Half_BIT;
+		break;
+	default:
+		break;
+	}
+
+	return link_mode;
+}
+
 #define BNXT_FW_TO_ETHTOOL_SPDS(fw_speeds, fw_pause, lk_ksettings, name)\
 {									\
 	if ((fw_speeds) & BNXT_LINK_SPEED_MSK_100MB)			\
@@ -1720,42 +1944,56 @@ u32 bnxt_fw_to_ethtool_speed(u16 fw_link_speed)
 	}
 }
 
+static void bnxt_get_default_speeds(struct ethtool_link_ksettings *lk_ksettings,
+				    struct bnxt_link_info *link_info)
+{
+	struct ethtool_link_settings *base = &lk_ksettings->base;
+
+	if (link_info->link_state == BNXT_LINK_STATE_UP) {
+		base->speed = bnxt_fw_to_ethtool_speed(link_info->link_speed);
+		base->duplex = DUPLEX_HALF;
+		if (link_info->duplex & BNXT_LINK_DUPLEX_FULL)
+			base->duplex = DUPLEX_FULL;
+	} else if (!link_info->autoneg) {
+		base->speed = bnxt_fw_to_ethtool_speed(link_info->req_link_speed);
+		base->duplex = DUPLEX_HALF;
+		if (link_info->req_duplex == BNXT_LINK_DUPLEX_FULL)
+			base->duplex = DUPLEX_FULL;
+	}
+}
+
 static int bnxt_get_link_ksettings(struct net_device *dev,
 				   struct ethtool_link_ksettings *lk_ksettings)
 {
-	struct bnxt *bp = netdev_priv(dev);
-	struct bnxt_link_info *link_info = &bp->link_info;
 	struct ethtool_link_settings *base = &lk_ksettings->base;
-	u32 ethtool_speed;
+	enum ethtool_link_mode_bit_indices link_mode;
+	struct bnxt *bp = netdev_priv(dev);
+	struct bnxt_link_info *link_info;
 
+	ethtool_link_ksettings_zero_link_mode(lk_ksettings, advertising);
 	ethtool_link_ksettings_zero_link_mode(lk_ksettings, supported);
+	base->duplex = DUPLEX_UNKNOWN;
+	base->speed = SPEED_UNKNOWN;
+	link_info = &bp->link_info;
+
 	mutex_lock(&bp->link_lock);
 	bnxt_fw_to_ethtool_support_spds(link_info, lk_ksettings);
+	link_mode = bnxt_get_link_mode(link_info);
+	if (link_mode != BNXT_LINK_MODE_UNKNOWN)
+		ethtool_params_from_link_mode(lk_ksettings, link_mode);
+	else
+		bnxt_get_default_speeds(lk_ksettings, link_info);
 
-	ethtool_link_ksettings_zero_link_mode(lk_ksettings, advertising);
 	if (link_info->autoneg) {
 		bnxt_fw_to_ethtool_advertised_spds(link_info, lk_ksettings);
 		ethtool_link_ksettings_add_link_mode(lk_ksettings,
 						     advertising, Autoneg);
 		base->autoneg = AUTONEG_ENABLE;
-		base->duplex = DUPLEX_UNKNOWN;
-		if (link_info->phy_link_status == BNXT_LINK_LINK) {
+		if (link_info->phy_link_status == BNXT_LINK_LINK)
 			bnxt_fw_to_ethtool_lp_adv(link_info, lk_ksettings);
-			if (link_info->duplex & BNXT_LINK_DUPLEX_FULL)
-				base->duplex = DUPLEX_FULL;
-			else
-				base->duplex = DUPLEX_HALF;
-		}
-		ethtool_speed = bnxt_fw_to_ethtool_speed(link_info->link_speed);
 	} else {
 		base->autoneg = AUTONEG_DISABLE;
-		ethtool_speed =
-			bnxt_fw_to_ethtool_speed(link_info->req_link_speed);
-		base->duplex = DUPLEX_HALF;
-		if (link_info->req_duplex == BNXT_LINK_DUPLEX_FULL)
-			base->duplex = DUPLEX_FULL;
 	}
-	base->speed = ethtool_speed;
 
 	base->port = PORT_NONE;
 	if (link_info->media_type == PORT_PHY_QCFG_RESP_MEDIA_TYPE_TP) {
@@ -1772,8 +2010,7 @@ static int bnxt_get_link_ksettings(struct net_device *dev,
 
 		if (link_info->media_type == PORT_PHY_QCFG_RESP_MEDIA_TYPE_DAC)
 			base->port = PORT_DA;
-		else if (link_info->media_type ==
-			 PORT_PHY_QCFG_RESP_MEDIA_TYPE_FIBRE)
+		else
 			base->port = PORT_FIBRE;
 	}
 	base->phy_address = link_info->phy_addr;