diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/en_clock.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/en_clock.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_clock.c b/drivers/net/ethernet/mellanox/mlx4/en_clock.c index 501c72f1fbe..2f181219662 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_clock.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_clock.c @@ -129,4 +129,23 @@ void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev) timecounter_init(&mdev->clock, &mdev->cycles, ktime_to_ns(ktime_get_real())); + + /* Calculate period in seconds to call the overflow watchdog - to make + * sure counter is checked at least once every wrap around. + */ + mdev->overflow_period = + (cyclecounter_cyc2ns(&mdev->cycles, + mdev->cycles.mask) / NSEC_PER_SEC / 2) + * HZ; +} + +void mlx4_en_ptp_overflow_check(struct mlx4_en_dev *mdev) +{ + bool timeout = time_is_before_jiffies(mdev->last_overflow_check + + mdev->overflow_period); + + if (timeout) { + timecounter_read(&mdev->clock); + mdev->last_overflow_check = jiffies; + } } |