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

[Yangbo Lu <yangbo.lu@xxxxxxx>]

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@xxxxxxx>
---
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