net/mlx5: Force round second at 1PPS out start time

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>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/clock.c
index ffac8a0e7a2321659976e9dd1714f87617f8662e..d2ed7b0a18ea433e39467a41cc6164e4bb770681 100644 (file)
--- 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);
 }