netdev - [PATCH net-next v9 07/13] ptp: Move from simple ida to xarray

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Message-Id: <20240226-feature_ptp_netnext-v9-7-455611549f21@bootlin.com>
Date: Mon, 26 Feb 2024 14:39:58 +0100
From: Kory Maincent <kory.maincent@...tlin.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Richard Cochran <richardcochran@...il.com>, 
 Radu Pirea <radu-nicolae.pirea@....nxp.com>, 
 Jay Vosburgh <j.vosburgh@...il.com>, Andy Gospodarek <andy@...yhouse.net>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Jonathan Corbet <corbet@....net>, 
 Horatiu Vultur <horatiu.vultur@...rochip.com>, UNGLinuxDriver@...rochip.com, 
 Simon Horman <horms@...nel.org>, Vladimir Oltean <vladimir.oltean@....com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
 Maxime Chevallier <maxime.chevallier@...tlin.com>, 
 Rahul Rameshbabu <rrameshbabu@...dia.com>, 
 Kory Maincent <kory.maincent@...tlin.com>
Subject: [PATCH net-next v9 07/13] ptp: Move from simple ida to xarray

Move from simple ida to xarray for storing and loading the ptp_clock
pointer. This prepares support for future hardware timestamp selection by
being able to link the ptp clock index to its pointer.

Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---

Changes in v8:
- New patch
---
 drivers/ptp/ptp_clock.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index 3aaf1a3430c5..f374b1e89780 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -31,7 +31,7 @@ struct class *ptp_class;

 static dev_t ptp_devt;

-static DEFINE_IDA(ptp_clocks_map);
+static DEFINE_XARRAY_FLAGS(ptp_clocks_map, XA_FLAGS_LOCK_IRQ | XA_FLAGS_ALLOC);

 /* time stamp event queue operations */

@@ -201,7 +201,7 @@ static void ptp_clock_release(struct device *dev)
 	bitmap_free(tsevq->mask);
 	kfree(tsevq);
 	debugfs_remove(ptp->debugfs_root);
-	ida_free(&ptp_clocks_map, ptp->index);
+	xa_erase(&ptp_clocks_map, ptp->index);
 	kfree(ptp);
 }

@@ -246,11 +246,10 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
 	if (ptp == NULL)
 		goto no_memory;

-	index = ida_alloc_max(&ptp_clocks_map, MINORMASK, GFP_KERNEL);
-	if (index < 0) {
-		err = index;
+	err = xa_alloc(&ptp_clocks_map, &index, ptp, xa_limit_31b,
+		       GFP_KERNEL);
+	if (err)
 		goto no_slot;
-	}

 	ptp->clock.ops = ptp_clock_ops;
 	ptp->info = info;
@@ -378,7 +377,7 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
 	list_del(&queue->qlist);
 	kfree(queue);
 no_memory_queue:
-	ida_free(&ptp_clocks_map, index);
+	xa_erase(&ptp_clocks_map, index);
 no_slot:
 	kfree(ptp);
 no_memory:
@@ -511,7 +510,7 @@ static void __exit ptp_exit(void)
 {
 	class_destroy(ptp_class);
 	unregister_chrdev_region(ptp_devt, MINORMASK + 1);
-	ida_destroy(&ptp_clocks_map);
+	xa_destroy(&ptp_clocks_map);
 }

 static int __init ptp_init(void)

-- 
2.25.1