netdev - [PATCHv2 net-next 2/4] ptp: increase maximum adjustment of virtual clocks.

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Date:   Wed,  2 Feb 2022 10:33:56 +0100
From:   Miroslav Lichvar <mlichvar@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Miroslav Lichvar <mlichvar@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        Yangbo Lu <yangbo.lu@....com>
Subject: [PATCHv2 net-next 2/4] ptp: increase maximum adjustment of virtual clocks.

Increase the maximum frequency offset of virtual clocks to 50% to enable
faster slewing corrections.

This value cannot be represented as scaled ppm when long has 32 bits,
but that is already the case for other drivers, even those that provide
the adjfine() function, i.e. 32-bit applications are expected to check
for the limit.

Signed-off-by: Miroslav Lichvar <mlichvar@...hat.com>
Acked-by: Richard Cochran <richardcochran@...il.com>
Cc: Yangbo Lu <yangbo.lu@....com>
---
 drivers/ptp/ptp_vclock.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c
index ab1d233173e1..5aa2b32d9dc7 100644
--- a/drivers/ptp/ptp_vclock.c
+++ b/drivers/ptp/ptp_vclock.c
@@ -84,8 +84,7 @@ static long ptp_vclock_refresh(struct ptp_clock_info *ptp)
 static const struct ptp_clock_info ptp_vclock_info = {
 	.owner		= THIS_MODULE,
 	.name		= "ptp virtual clock",
-	/* The maximum ppb value that long scaled_ppm can support */
-	.max_adj	= 32767999,
+	.max_adj	= 500000000,
 	.adjfine	= ptp_vclock_adjfine,
 	.adjtime	= ptp_vclock_adjtime,
 	.gettime64	= ptp_vclock_gettime,
-- 
2.34.1