Commit 2e0645a0 authored by Jacob Keller's avatar Jacob Keller Committed by David S. Miller
Browse files

mlx5: reject unsupported external timestamp flags



Fix the mlx5 core PTP support to explicitly reject any future flags that
get added to the external timestamp request ioctl.

In order to maintain currently functioning code, this patch accepts all
three current flags. This is because the PTP_RISING_EDGE and
PTP_FALLING_EDGE flags have unclear semantics and each driver seems to
have interpreted them slightly differently.

[ RC: I'm not 100% sure what this driver does, but if I'm not wrong it
      follows the dp83640:

  flags                                                 Meaning
  ----------------------------------------------------  --------------------------
  PTP_ENABLE_FEATURE                                    Time stamp rising edge
  PTP_ENABLE_FEATURE|PTP_RISING_EDGE                    Time stamp rising edge
  PTP_ENABLE_FEATURE|PTP_FALLING_EDGE                   Time stamp falling edge
  PTP_ENABLE_FEATURE|PTP_RISING_EDGE|PTP_FALLING_EDGE   Time stamp falling edge
]

Cc: Feras Daoud <ferasda@mellanox.com>
Cc: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Reviewed-by: default avatarRichard Cochran <richardcochran@gmail.com>
Reviewed-by: default avatarSaeed Mahameed <saeedm@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6edd110b
......@@ -236,6 +236,12 @@ static int mlx5_extts_configure(struct ptp_clock_info *ptp,
if (!MLX5_PPS_CAP(mdev))
return -EOPNOTSUPP;
/* Reject requests with unsupported flags */
if (rq->extts.flags & ~(PTP_ENABLE_FEATURE |
PTP_RISING_EDGE |
PTP_FALLING_EDGE))
return -EOPNOTSUPP;
if (rq->extts.index >= clock->ptp_info.n_pins)
return -EINVAL;
......
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