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Message-Id: <20200425180621.1140452-7-andrew@lunn.ch>
Date: Sat, 25 Apr 2020 20:06:18 +0200
From: Andrew Lunn <andrew@...n.ch>
To: David Miller <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>,
Florian Fainelli <f.fainelli@...il.com>,
Heiner Kallweit <hkallweit1@...il.com>,
Chris Healy <cphealy@...il.com>,
Michal Kubecek <mkubecek@...e.cz>, Andrew Lunn <andrew@...n.ch>
Subject: [PATCH net-next v1 6/9] net: ethtool: Add infrastructure for reporting cable test results
Provide infrastructure for PHY drivers to report the cable test
results. A netlink skb is associated to the phydev. Helpers will be
added which can add results to this skb. Once the test has finished
the results are sent to user space.
When netlink ethtool is not part of the kernel configuration stubs are
provided. It is also impossible to trigger a cable test, so the error
code returned by the alloc function is of no consequence.
Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
drivers/net/phy/phy.c | 21 ++++++++++++--
include/linux/ethtool_netlink.h | 20 +++++++++++++
include/linux/phy.h | 5 ++++
net/ethtool/cabletest.c | 50 +++++++++++++++++++++++++++++++++
4 files changed, 94 insertions(+), 2 deletions(-)
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 242a7c1c4b6c..88275d971f14 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -22,6 +22,7 @@
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
+#include <linux/ethtool_netlink.h>
#include <linux/phy.h>
#include <linux/phy_led_triggers.h>
#include <linux/sfp.h>
@@ -30,6 +31,9 @@
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/atomic.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+#include <net/sock.h>
#define PHY_STATE_TIME HZ
@@ -474,13 +478,14 @@ static void phy_trigger_machine(struct phy_device *phydev)
static void phy_cable_test_abort(struct phy_device *phydev)
{
+ ethnl_cable_test_finished(phydev);
genphy_soft_reset(phydev);
}
int phy_start_cable_test(struct phy_device *phydev,
struct netlink_ext_ack *extack)
{
- int err;
+ int err = -ENOMEM;
if (!(phydev->drv &&
phydev->drv->cable_test_start &&
@@ -499,19 +504,30 @@ int phy_start_cable_test(struct phy_device *phydev,
goto out;
}
+ err = ethnl_cable_test_alloc(phydev);
+ if (err)
+ goto out;
+
/* Mark the carrier down until the test is complete */
phy_link_down(phydev, true);
err = phydev->drv->cable_test_start(phydev);
if (err) {
phy_link_up(phydev);
- goto out;
+ goto out_free;
}
phydev->state = PHY_CABLETEST;
if (phy_polling_mode(phydev))
phy_trigger_machine(phydev);
+
+ mutex_unlock(&phydev->lock);
+
+ return 0;
+
+out_free:
+ ethnl_cable_test_free(phydev);
out:
mutex_unlock(&phydev->lock);
@@ -951,6 +967,7 @@ void phy_state_machine(struct work_struct *work)
}
if (finished) {
+ ethnl_cable_test_finished(phydev);
needs_aneg = true;
phydev->state = PHY_UP;
}
diff --git a/include/linux/ethtool_netlink.h b/include/linux/ethtool_netlink.h
index d01b77887f82..7d763ba22f6f 100644
--- a/include/linux/ethtool_netlink.h
+++ b/include/linux/ethtool_netlink.h
@@ -14,4 +14,24 @@ enum ethtool_multicast_groups {
ETHNL_MCGRP_MONITOR,
};
+struct phy_device;
+
+#if IS_ENABLED(CONFIG_ETHTOOL_NETLINK)
+int ethnl_cable_test_alloc(struct phy_device *phydev);
+void ethnl_cable_test_free(struct phy_device *phydev);
+void ethnl_cable_test_finished(struct phy_device *phydev);
+#else
+static inline int ethnl_cable_test_alloc(struct phy_device *phydev)
+{
+ return -ENOTSUPP;
+}
+
+static inline void ethnl_cable_test_free(struct phy_device *phydev)
+{
+}
+
+static inline void ethnl_cable_test_finished(struct phy_device *phydev)
+{
+}
+#endif /* IS_ENABLED(ETHTOOL_NETLINK) */
#endif /* _LINUX_ETHTOOL_NETLINK_H_ */
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 593da2c6041d..ee69f781995a 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -487,6 +487,11 @@ struct phy_device {
/* For use by PHYs to maintain extra state */
void *priv;
+ /* Reporting cable test results */
+ struct sk_buff *skb;
+ void *ehdr;
+ struct nlattr *nest;
+
/* Interrupt and Polling infrastructure */
struct delayed_work state_queue;
diff --git a/net/ethtool/cabletest.c b/net/ethtool/cabletest.c
index 44b8165ac66e..7d73239b9ead 100644
--- a/net/ethtool/cabletest.c
+++ b/net/ethtool/cabletest.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/phy.h>
+#include <linux/ethtool_netlink.h>
#include "netlink.h"
#include "common.h"
#include "bitset.h"
@@ -80,3 +81,52 @@ int ethnl_act_cable_test(struct sk_buff *skb, struct genl_info *info)
dev_put(dev);
return ret;
}
+
+int ethnl_cable_test_alloc(struct phy_device *phydev)
+{
+ int err = -ENOMEM;
+
+ phydev->skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!phydev->skb)
+ goto out;
+
+ phydev->ehdr = ethnl_bcastmsg_put(phydev->skb,
+ ETHTOOL_MSG_CABLE_TEST_NTF);
+ if (!phydev->ehdr) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ err = ethnl_fill_reply_header(phydev->skb, phydev->attached_dev,
+ ETHTOOL_A_CABLE_TEST_NTF_DEV);
+ if (err)
+ goto out;
+
+ phydev->nest = nla_nest_start(phydev->skb,
+ ETHTOOL_A_CABLE_TEST_NTF_NEST);
+ if (!phydev->nest)
+ goto out;
+
+ return 0;
+
+out:
+ nlmsg_free(phydev->skb);
+ return err;
+}
+EXPORT_SYMBOL_GPL(ethnl_cable_test_alloc);
+
+void ethnl_cable_test_free(struct phy_device *phydev)
+{
+ nlmsg_free(phydev->skb);
+}
+EXPORT_SYMBOL_GPL(ethnl_cable_test_free);
+
+void ethnl_cable_test_finished(struct phy_device *phydev)
+{
+ nla_nest_end(phydev->skb, phydev->nest);
+
+ genlmsg_end(phydev->skb, phydev->ehdr);
+
+ ethnl_multicast(phydev->skb, phydev->attached_dev);
+}
+EXPORT_SYMBOL_GPL(ethnl_cable_test_finished);
--
2.26.1
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