mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
net/mlx4_en: Choose time-stamping shift value according to HW frequency
Previously, the shift value used for time-stamping was constant and didn't
depend on the HW chip frequency. Change that to take the frequency into account
and calculate the maximal value in cycles per wraparound of ten seconds. This
time slot was chosen since it gives a good accuracy in time synchronization.
Algorithm for shift value calculation:
* Round up the maximal value in cycles to nearest power of two
* Calculate maximal multiplier by division of all 64 bits set
to above result
* Then, invert the function clocksource_khz2mult() to get the shift from
maximal mult value
Fixes: ec693d4701
('net/mlx4_en: Add HW timestamping (TS) support')
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
281e8b2fdf
commit
31c128b66e
1 changed files with 19 additions and 6 deletions
|
@ -236,6 +236,24 @@ static const struct ptp_clock_info mlx4_en_ptp_clock_info = {
|
|||
.enable = mlx4_en_phc_enable,
|
||||
};
|
||||
|
||||
#define MLX4_EN_WRAP_AROUND_SEC 10ULL
|
||||
|
||||
/* This function calculates the max shift that enables the user range
|
||||
* of MLX4_EN_WRAP_AROUND_SEC values in the cycles register.
|
||||
*/
|
||||
static u32 freq_to_shift(u16 freq)
|
||||
{
|
||||
u32 freq_khz = freq * 1000;
|
||||
u64 max_val_cycles = freq_khz * 1000 * MLX4_EN_WRAP_AROUND_SEC;
|
||||
u64 max_val_cycles_rounded = is_power_of_2(max_val_cycles + 1) ?
|
||||
max_val_cycles : roundup_pow_of_two(max_val_cycles) - 1;
|
||||
/* calculate max possible multiplier in order to fit in 64bit */
|
||||
u64 max_mul = div_u64(0xffffffffffffffffULL, max_val_cycles_rounded);
|
||||
|
||||
/* This comes from the reverse of clocksource_khz2mult */
|
||||
return ilog2(div_u64(max_mul * freq_khz, 1000000));
|
||||
}
|
||||
|
||||
void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev)
|
||||
{
|
||||
struct mlx4_dev *dev = mdev->dev;
|
||||
|
@ -254,12 +272,7 @@ void mlx4_en_init_timestamp(struct mlx4_en_dev *mdev)
|
|||
memset(&mdev->cycles, 0, sizeof(mdev->cycles));
|
||||
mdev->cycles.read = mlx4_en_read_clock;
|
||||
mdev->cycles.mask = CLOCKSOURCE_MASK(48);
|
||||
/* Using shift to make calculation more accurate. Since current HW
|
||||
* clock frequency is 427 MHz, and cycles are given using a 48 bits
|
||||
* register, the biggest shift when calculating using u64, is 14
|
||||
* (max_cycles * multiplier < 2^64)
|
||||
*/
|
||||
mdev->cycles.shift = 14;
|
||||
mdev->cycles.shift = freq_to_shift(dev->caps.hca_core_clock);
|
||||
mdev->cycles.mult =
|
||||
clocksource_khz2mult(1000 * dev->caps.hca_core_clock, mdev->cycles.shift);
|
||||
mdev->nominal_c_mult = mdev->cycles.mult;
|
||||
|
|
Loading…
Reference in a new issue