linux-kernel - [PATCH v3 1/3] net: phy: bcm54811: New link mode for BroadR-Reach

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Date: Mon, 6 May 2024 16:40:13 +0200
From: Kamil Horák - 2N <kamilh@...s.com>
To: <florian.fainelli@...adcom.com>, <bcm-kernel-feedback-list@...adcom.com>,
	<andrew@...n.ch>, <hkallweit1@...il.com>
CC: <kamilh@...s.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v3 1/3] net: phy: bcm54811: New link mode for BroadR-Reach

Introduce new link modes necessary for the BroadR-Reach mode on
bcm5481x PHY by Broadcom and new PHY tunable to choose between
normal (IEEE) ethernet and BroadR-Reach modes of the PHY.
---
 drivers/net/phy/phy-core.c   | 9 +++++----
 include/uapi/linux/ethtool.h | 9 ++++++++-
 net/ethtool/common.c         | 7 +++++++
 net/ethtool/ioctl.c          | 1 +
 4 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
index 15f349e5995a..129e223d8985 100644
--- a/drivers/net/phy/phy-core.c
+++ b/drivers/net/phy/phy-core.c
@@ -13,10 +13,9 @@
  */
 const char *phy_speed_to_str(int speed)
 {
-	BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 102,
-		"Enum ethtool_link_mode_bit_indices and phylib are out of sync. "
-		"If a speed or mode has been added please update phy_speed_to_str "
-		"and the PHY settings array.\n");
+	BUILD_BUG_ON_MSG(__ETHTOOL_LINK_MODE_MASK_NBITS != 103,
+			 "Enum ethtool_link_mode_bit_indices and phylib are out of sync. If a speed or mode has been added please update phy_speed_to_str and the PHY settings array.\n"
+			);
 
 	switch (speed) {
 	case SPEED_10:
@@ -265,6 +264,8 @@ static const struct phy_setting settings[] = {
 	PHY_SETTING(     10, FULL,     10baseT1S_Full		),
 	PHY_SETTING(     10, HALF,     10baseT1S_Half		),
 	PHY_SETTING(     10, HALF,     10baseT1S_P2MP_Half	),
+	PHY_SETTING(     10, FULL,     1BR10			),
+
 };
 #undef PHY_SETTING
 
diff --git a/include/uapi/linux/ethtool.h b/include/uapi/linux/ethtool.h
index 041e09c3515d..105432565e6d 100644
--- a/include/uapi/linux/ethtool.h
+++ b/include/uapi/linux/ethtool.h
@@ -289,11 +289,18 @@ struct ethtool_tunable {
 #define ETHTOOL_PHY_EDPD_NO_TX			0xfffe
 #define ETHTOOL_PHY_EDPD_DISABLE		0
 
+/*
+ *	BroadR-Reach Mode Control
+ */
+#define ETHTOOL_PHY_BRR_MODE_ON		1
+#define ETHTOOL_PHY_BRR_MODE_OFF	0
+
 enum phy_tunable_id {
 	ETHTOOL_PHY_ID_UNSPEC,
 	ETHTOOL_PHY_DOWNSHIFT,
 	ETHTOOL_PHY_FAST_LINK_DOWN,
 	ETHTOOL_PHY_EDPD,
+	ETHTOOL_PHY_BRR_MODE,
 	/*
 	 * Add your fresh new phy tunable attribute above and remember to update
 	 * phy_tunable_strings[] in net/ethtool/common.c
@@ -1845,7 +1852,7 @@ enum ethtool_link_mode_bit_indices {
 	ETHTOOL_LINK_MODE_10baseT1S_Full_BIT		 = 99,
 	ETHTOOL_LINK_MODE_10baseT1S_Half_BIT		 = 100,
 	ETHTOOL_LINK_MODE_10baseT1S_P2MP_Half_BIT	 = 101,
-
+	ETHTOOL_LINK_MODE_1BR10_BIT			 = 102,
 	/* must be last entry */
 	__ETHTOOL_LINK_MODE_MASK_NBITS
 };
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 6b2a360dcdf0..5e37804958e9 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -98,6 +98,7 @@ phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 	[ETHTOOL_PHY_DOWNSHIFT]	= "phy-downshift",
 	[ETHTOOL_PHY_FAST_LINK_DOWN] = "phy-fast-link-down",
 	[ETHTOOL_PHY_EDPD]	= "phy-energy-detect-power-down",
+	[ETHTOOL_PHY_BRR_MODE]	= "phy-broadrreach-mode",
 };
 
 #define __LINK_MODE_NAME(speed, type, duplex) \
@@ -211,6 +212,7 @@ const char link_mode_names[][ETH_GSTRING_LEN] = {
 	__DEFINE_LINK_MODE_NAME(10, T1S, Full),
 	__DEFINE_LINK_MODE_NAME(10, T1S, Half),
 	__DEFINE_LINK_MODE_NAME(10, T1S_P2MP, Half),
+	__DEFINE_SPECIAL_MODE_NAME(1BR10, "1BR10"),
 };
 static_assert(ARRAY_SIZE(link_mode_names) == __ETHTOOL_LINK_MODE_MASK_NBITS);
 
@@ -374,6 +376,11 @@ const struct link_mode_info link_mode_params[] = {
 	__DEFINE_LINK_MODE_PARAMS(10, T1S, Full),
 	__DEFINE_LINK_MODE_PARAMS(10, T1S, Half),
 	__DEFINE_LINK_MODE_PARAMS(10, T1S_P2MP, Half),
+	[ETHTOOL_LINK_MODE_1BR10_BIT] = {
+		.speed	= SPEED_10,
+		.lanes  = 1,
+		.duplex = DUPLEX_FULL,
+	},
 };
 static_assert(ARRAY_SIZE(link_mode_params) == __ETHTOOL_LINK_MODE_MASK_NBITS);
 
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 5a55270aa86e..9e68c8562fa3 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -2722,6 +2722,7 @@ static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
 	switch (tuna->id) {
 	case ETHTOOL_PHY_DOWNSHIFT:
 	case ETHTOOL_PHY_FAST_LINK_DOWN:
+	case ETHTOOL_PHY_BRR_MODE:
 		if (tuna->len != sizeof(u8) ||
 		    tuna->type_id != ETHTOOL_TUNABLE_U8)
 			return -EINVAL;
-- 
2.39.2