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mlx5_en: use read sequence for gettimex64

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The gettimex64() doesn't modify values in timecounter, that's why there
is no need to update sequence counter. Reduce the contention on sequence
lock for multi-thread PHC reading use-case.

Signed-off-by: Vadim Fedorenko <vadfed@meta.com>
Reviewed-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Acked-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/20241014170103.2473580-1-vadfed@meta.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vadim Fedorenko
2024-10-14 10:01:03 -07:00
committed by Jakub Kicinski
parent ccb35037c4
commit 0452a2d8b8
1 changed files with 1 additions and 5 deletions
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6
drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
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@@ -402,9 +402,7 @@ static int mlx5_ptp_gettimex(struct ptp_clock_info *ptp, struct timespec64 *ts,
struct ptp_system_timestamp *sts)
{
struct mlx5_clock *clock = container_of(ptp, struct mlx5_clock, ptp_info);
struct mlx5_timer *timer = &clock->timer;
struct mlx5_core_dev *mdev;
unsigned long flags;
u64 cycles, ns;
mdev = container_of(clock, struct mlx5_core_dev, clock);
@@ -413,10 +411,8 @@ static int mlx5_ptp_gettimex(struct ptp_clock_info *ptp, struct timespec64 *ts,
goto out;
}
write_seqlock_irqsave(&clock->lock, flags);
cycles = mlx5_read_time(mdev, sts, false);
ns = timecounter_cyc2time(&timer->tc, cycles);
write_sequnlock_irqrestore(&clock->lock, flags);
ns = mlx5_timecounter_cyc2time(clock, cycles);
*ts = ns_to_timespec64(ns);
out:
return 0;