[PATCH 5.14 061/151] net/mlx5: Force round second at 1PPS out start time

Greg Kroah-Hartman
2021-10-11T14:04:49Z

From: Aya Levin <ayal@nvidia.com>

[ Upstream commit 64728294703e77827cc31a1b164ca867400067f5 ]

Allow configuration of 1PPS start time only with time-stamp representing
a round second. Prior to this patch driver allowed setting of a
non-round-second which is not supported by the device. Avoid unexpected
behavior by restricting start-time configuration to a round-second.

Fixes: 4272f9b88db9 ("net/mlx5e: Change 1PPS out scheme")
Signed-off-by: Aya Levin <ayal@nvidia.com>
Reviewed-by: Eran Ben Elisha <eranbe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../ethernet/mellanox/mlx5/core/lib/clock.c | 25 ++++++++-----------
1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index ce696d523493..a8c6450637da 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
@@ -448,22 +448,20 @@ static u64 find_target_cycles(struct mlx5_core_dev *mdev, s64 target_ns)
return cycles_now + cycles_delta;
}

-static u64 perout_conf_internal_timer(struct mlx5_core_dev *mdev,
- s64 sec, u32 nsec)
+static u64 perout_conf_internal_timer(struct mlx5_core_dev *mdev, s64 sec)
{
- struct timespec64 ts;
+ struct timespec64 ts = {};
s64 target_ns;

ts.tv_sec = sec;
- ts.tv_nsec = nsec;
target_ns = timespec64_to_ns(&ts);

return find_target_cycles(mdev, target_ns);
}

-static u64 perout_conf_real_time(s64 sec, u32 nsec)
+static u64 perout_conf_real_time(s64 sec)
{
- return (u64)nsec | (u64)sec << 32;
+ return (u64)sec << 32;
}

static int mlx5_perout_configure(struct ptp_clock_info *ptp,
@@ -501,8 +499,10 @@ static int mlx5_perout_configure(struct ptp_clock_info *ptp,

if (on) {
bool rt_mode = mlx5_real_time_mode(mdev);
- u32 nsec;
- s64 sec;
+ s64 sec = rq->perout.start.sec;
+
+ if (rq->perout.start.nsec)
+ return -EINVAL;

pin_mode = MLX5_PIN_MODE_OUT;
pattern = MLX5_OUT_PATTERN_PERIODIC;
@@ -513,14 +513,11 @@ static int mlx5_perout_configure(struct ptp_clock_info *ptp,
if ((ns >> 1) != 500000000LL)
return -EINVAL;

- nsec = rq->perout.start.nsec;
- sec = rq->perout.start.sec;
-
if (rt_mode && sec > U32_MAX)
return -EINVAL;

- time_stamp = rt_mode ? perout_conf_real_time(sec, nsec) :
- perout_conf_internal_timer(mdev, sec, nsec);
+ time_stamp = rt_mode ? perout_conf_real_time(sec) :
+ perout_conf_internal_timer(mdev, sec);

field_select |= MLX5_MTPPS_FS_PIN_MODE |
MLX5_MTPPS_FS_PATTERN |
@@ -717,7 +714,7 @@ static u64 perout_conf_next_event_timer(struct mlx5_core_dev *mdev,
ts_next_sec(&ts);
target_ns = timespec64_to_ns(&ts);

- return rt_mode ? perout_conf_real_time(ts.tv_sec, ts.tv_nsec) :
+ return rt_mode ? perout_conf_real_time(ts.tv_sec) :
find_target_cycles(mdev, target_ns);
}

--
2.33.0