linux-kernel - [net-next, v3, 03/10] ptp: track available ptp vclocks information

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Date:   Tue, 15 Jun 2021 17:45:10 +0800
From:   Yangbo Lu <yangbo.lu@....com>
To:     netdev@...r.kernel.org
Cc:     Yangbo Lu <yangbo.lu@....com>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, mptcp@...ts.linux.dev,
        Richard Cochran <richardcochran@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Shuah Khan <shuah@...nel.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Rui Sousa <rui.sousa@....com>,
        Sebastien Laveze <sebastien.laveze@....com>
Subject: [net-next, v3, 03/10] ptp: track available ptp vclocks information

Track available ptp vclocks information. Record index values
of available ptp vclocks during registering and unregistering.

This is preparation for supporting ptp vclocks info query
through ethtool.

Signed-off-by: Yangbo Lu <yangbo.lu@....com>
---
Change for v3:
	- Added this patch.
---
 drivers/ptp/ptp_clock.c   | 2 ++
 drivers/ptp/ptp_private.h | 1 +
 drivers/ptp/ptp_sysfs.c   | 6 ++++++
 3 files changed, 9 insertions(+)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index 78414b3e16dd..38842a76acf8 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -236,6 +236,8 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
 	if (parent->class && strcmp(parent->class->name, "ptp") == 0)
 		ptp->vclock_flag = true;
 
+	memset(ptp->vclock_index, -1, sizeof(ptp->vclock_index));
+
 	err = ptp_populate_pin_groups(ptp);
 	if (err)
 		goto no_pin_groups;
diff --git a/drivers/ptp/ptp_private.h b/drivers/ptp/ptp_private.h
index 6949afc9d733..5671710ca0fa 100644
--- a/drivers/ptp/ptp_private.h
+++ b/drivers/ptp/ptp_private.h
@@ -47,6 +47,7 @@ struct ptp_clock {
 	struct kthread_worker *kworker;
 	struct kthread_delayed_work aux_work;
 	u8 n_vclocks;
+	int vclock_index[PTP_MAX_VCLOCKS];
 	struct mutex n_vclocks_mux; /* protect concurrent n_vclocks access */
 	bool vclock_flag;
 };
diff --git a/drivers/ptp/ptp_sysfs.c b/drivers/ptp/ptp_sysfs.c
index 600edd7a90af..d9534935c1e6 100644
--- a/drivers/ptp/ptp_sysfs.c
+++ b/drivers/ptp/ptp_sysfs.c
@@ -207,6 +207,9 @@ static ssize_t n_vclocks_store(struct device *dev,
 				goto out;
 			}
 
+			ptp->vclock_index[ptp->n_vclocks + i] =
+				vclock->clock->index;
+
 			dev_info(dev, "new virtual clock ptp%d\n",
 				 vclock->clock->index);
 		}
@@ -217,6 +220,9 @@ static ssize_t n_vclocks_store(struct device *dev,
 		i = ptp->n_vclocks - num;
 		device_for_each_child_reverse(dev, &i,
 					      unregister_vclock);
+
+		for (i = 1; i <= ptp->n_vclocks - num; i++)
+			ptp->vclock_index[ptp->n_vclocks - i] = -1;
 	}
 
 	if (num == 0)
-- 
2.25.1