From: Andrew Lunn <andrew@lunn.ch>
Date: Tue, 26 May 2020 22:21:39 +0000 (+0200)
Subject: net: ethtool: Add helpers for cable test TDR data
X-Git-Tag: baikal/mips/sdk5.9~13530^2~94^2~4
X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=7aa6f827bf855b5b2afc3c2060db597a226ef9e4;p=kernel.git

net: ethtool: Add helpers for cable test TDR data

Add helpers for returning raw TDR helpers in netlink messages.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/linux/ethtool_netlink.h b/include/linux/ethtool_netlink.h
index 24817ba252a0c..8fbe4f97ffadf 100644
--- a/include/linux/ethtool_netlink.h
+++ b/include/linux/ethtool_netlink.h
@@ -22,6 +22,10 @@ void ethnl_cable_test_free(struct phy_device *phydev);
 void ethnl_cable_test_finished(struct phy_device *phydev);
 int ethnl_cable_test_result(struct phy_device *phydev, u8 pair, u8 result);
 int ethnl_cable_test_fault_length(struct phy_device *phydev, u8 pair, u32 cm);
+int ethnl_cable_test_amplitude(struct phy_device *phydev, u8 pair, s16 mV);
+int ethnl_cable_test_pulse(struct phy_device *phydev, u16 mV);
+int ethnl_cable_test_step(struct phy_device *phydev, u32 first, u32 last,
+			  u32 step);
 #else
 static inline int ethnl_cable_test_alloc(struct phy_device *phydev, u8 cmd)
 {
@@ -46,5 +50,22 @@ static inline int ethnl_cable_test_fault_length(struct phy_device *phydev,
 {
 	return -EOPNOTSUPP;
 }
+
+static inline int ethnl_cable_test_amplitude(struct phy_device *phydev,
+					     u8 pair, s16 mV)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int ethnl_cable_test_pulse(struct phy_device *phydev, u16 mV)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int ethnl_cable_test_step(struct phy_device *phydev, u32 first,
+					u32 last, u32 step)
+{
+	return -EOPNOTSUPP;
+}
 #endif /* IS_ENABLED(ETHTOOL_NETLINK) */
 #endif /* _LINUX_ETHTOOL_NETLINK_H_ */
diff --git a/net/ethtool/cabletest.c b/net/ethtool/cabletest.c
index 94e9d5f043535..390d0673ff010 100644
--- a/net/ethtool/cabletest.c
+++ b/net/ethtool/cabletest.c
@@ -100,7 +100,10 @@ int ethnl_cable_test_alloc(struct phy_device *phydev, u8 cmd)
 {
 	int err = -ENOMEM;
 
-	phydev->skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	/* One TDR sample occupies 20 bytes. For a 150 meter cable,
+	 * with four pairs, around 12K is needed.
+	 */
+	phydev->skb = genlmsg_new(SZ_16K, GFP_KERNEL);
 	if (!phydev->skb)
 		goto out;
 
@@ -251,3 +254,78 @@ out_dev_put:
 	dev_put(dev);
 	return ret;
 }
+ 
+int ethnl_cable_test_amplitude(struct phy_device *phydev,
+			       u8 pair, s16 mV)
+{
+	struct nlattr *nest;
+	int ret = -EMSGSIZE;
+
+	nest = nla_nest_start(phydev->skb,
+			      ETHTOOL_A_CABLE_TDR_NEST_AMPLITUDE);
+	if (!nest)
+		return -EMSGSIZE;
+
+	if (nla_put_u8(phydev->skb, ETHTOOL_A_CABLE_AMPLITUDE_PAIR, pair))
+		goto err;
+	if (nla_put_u16(phydev->skb, ETHTOOL_A_CABLE_AMPLITUDE_mV, mV))
+		goto err;
+
+	nla_nest_end(phydev->skb, nest);
+	return 0;
+
+err:
+	nla_nest_cancel(phydev->skb, nest);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ethnl_cable_test_amplitude);
+
+int ethnl_cable_test_pulse(struct phy_device *phydev, u16 mV)
+{
+	struct nlattr *nest;
+	int ret = -EMSGSIZE;
+
+	nest = nla_nest_start(phydev->skb, ETHTOOL_A_CABLE_TDR_NEST_PULSE);
+	if (!nest)
+		return -EMSGSIZE;
+
+	if (nla_put_u16(phydev->skb, ETHTOOL_A_CABLE_PULSE_mV, mV))
+		goto err;
+
+	nla_nest_end(phydev->skb, nest);
+	return 0;
+
+err:
+	nla_nest_cancel(phydev->skb, nest);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ethnl_cable_test_pulse);
+
+int ethnl_cable_test_step(struct phy_device *phydev, u32 first, u32 last,
+			  u32 step)
+{
+	struct nlattr *nest;
+	int ret = -EMSGSIZE;
+
+	nest = nla_nest_start(phydev->skb, ETHTOOL_A_CABLE_TDR_NEST_STEP);
+	if (!nest)
+		return -EMSGSIZE;
+
+	if (nla_put_u32(phydev->skb, ETHTOOL_A_CABLE_STEP_FIRST_DISTANCE,
+			first))
+		goto err;
+
+	if (nla_put_u32(phydev->skb, ETHTOOL_A_CABLE_STEP_LAST_DISTANCE, last))
+		goto err;
+
+	if (nla_put_u32(phydev->skb, ETHTOOL_A_CABLE_STEP_STEP_DISTANCE, step))
+		goto err;
+
+	nla_nest_end(phydev->skb, nest);
+	return 0;
+
+err:
+	nla_nest_cancel(phydev->skb, nest);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(ethnl_cable_test_step);