This is a note to let you know that I've just added the patch titled
net/mlx5: use do_aux_work for PHC overflow checks
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-mlx5-use-do_aux_work-for-phc-overflow-checks.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 74fbe1f56dfa54fbed9e41a0b3abaeadc5fca8df
Author: Vadim Fedorenko <vadim.fedorenko@xxxxxxxxx>
Date: Tue Jan 7 02:48:12 2025 -0800
net/mlx5: use do_aux_work for PHC overflow checks
[ Upstream commit e61e6c415ba9ff2b32bb6780ce1b17d1d76238f1 ]
The overflow_work is using system wq to do overflow checks and updates
for PHC device timecounter, which might be overhelmed by other tasks.
But there is dedicated kthread in PTP subsystem designed for such
things. This patch changes the work queue to proper align with PTP
subsystem and to avoid overloading system work queue.
The adjfine() function acts the same way as overflow check worker,
we can postpone ptp aux worker till the next overflow period after
adjfine() was called.
Reviewed-by: Dragos Tatulea <dtatulea@xxxxxxxxxx>
Signed-off-by: Vadim Fedorenko <vadfed@xxxxxxxx>
Acked-by: Tariq Toukan <tariqt@xxxxxxxxxx>
Link: https://patch.msgid.link/20250107104812.380225-1-vadfed@xxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index b306ae79bf97a..863196ad0ddc7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -322,17 +322,16 @@ static void mlx5_pps_out(struct work_struct *work)
}
}
-static void mlx5_timestamp_overflow(struct work_struct *work)
+static long mlx5_timestamp_overflow(struct ptp_clock_info *ptp_info)
{
- struct delayed_work *dwork = to_delayed_work(work);
struct mlx5_core_dev *mdev;
struct mlx5_timer *timer;
struct mlx5_clock *clock;
unsigned long flags;
- timer = container_of(dwork, struct mlx5_timer, overflow_work);
- clock = container_of(timer, struct mlx5_clock, timer);
+ clock = container_of(ptp_info, struct mlx5_clock, ptp_info);
mdev = container_of(clock, struct mlx5_core_dev, clock);
+ timer = &clock->timer;
if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR)
goto out;
@@ -343,7 +342,7 @@ static void mlx5_timestamp_overflow(struct work_struct *work)
write_sequnlock_irqrestore(&clock->lock, flags);
out:
- schedule_delayed_work(&timer->overflow_work, timer->overflow_period);
+ return timer->overflow_period;
}
static int mlx5_ptp_settime_real_time(struct mlx5_core_dev *mdev,
@@ -521,6 +520,7 @@ static int mlx5_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
timer->cycles.mult = mult;
mlx5_update_clock_info_page(mdev);
write_sequnlock_irqrestore(&clock->lock, flags);
+ ptp_schedule_worker(clock->ptp, timer->overflow_period);
return 0;
}
@@ -856,6 +856,7 @@ static const struct ptp_clock_info mlx5_ptp_clock_info = {
.settime64 = mlx5_ptp_settime,
.enable = NULL,
.verify = NULL,
+ .do_aux_work = mlx5_timestamp_overflow,
};
static int mlx5_query_mtpps_pin_mode(struct mlx5_core_dev *mdev, u8 pin,
@@ -1056,12 +1057,11 @@ static void mlx5_init_overflow_period(struct mlx5_clock *clock)
do_div(ns, NSEC_PER_SEC / HZ);
timer->overflow_period = ns;
- INIT_DELAYED_WORK(&timer->overflow_work, mlx5_timestamp_overflow);
- if (timer->overflow_period)
- schedule_delayed_work(&timer->overflow_work, 0);
- else
+ if (!timer->overflow_period) {
+ timer->overflow_period = HZ;
mlx5_core_warn(mdev,
- "invalid overflow period, overflow_work is not scheduled\n");
+ "invalid overflow period, overflow_work is scheduled once per second\n");
+ }
if (clock_info)
clock_info->overflow_period = timer->overflow_period;
@@ -1176,6 +1176,9 @@ void mlx5_init_clock(struct mlx5_core_dev *mdev)
MLX5_NB_INIT(&clock->pps_nb, mlx5_pps_event, PPS_EVENT);
mlx5_eq_notifier_register(mdev, &clock->pps_nb);
+
+ if (clock->ptp)
+ ptp_schedule_worker(clock->ptp, 0);
}
void mlx5_cleanup_clock(struct mlx5_core_dev *mdev)
@@ -1192,7 +1195,6 @@ void mlx5_cleanup_clock(struct mlx5_core_dev *mdev)
}
cancel_work_sync(&clock->pps_info.out_work);
- cancel_delayed_work_sync(&clock->timer.overflow_work);
if (mdev->clock_info) {
free_page((unsigned long)mdev->clock_info);
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 82c7056e27599..d4b2c09cd5fec 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -722,7 +722,6 @@ struct mlx5_timer {
struct timecounter tc;
u32 nominal_c_mult;
unsigned long overflow_period;
- struct delayed_work overflow_work;
};
struct mlx5_clock {
