• Jacob Keller's avatar
    igb: reject unsupported external timestamp flags · 6edd110b
    Jacob Keller authored
    Fix the igb 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.
    
    This HW always time stamps both edges:
    
      flags                                                 Meaning
      ----------------------------------------------------  --------------------------
      PTP_ENABLE_FEATURE                                    Time stamp both edges
      PTP_ENABLE_FEATURE|PTP_RISING_EDGE                    Time stamp both edges
      PTP_ENABLE_FEATURE|PTP_FALLING_EDGE                   Time stamp both edges
      PTP_ENABLE_FEATURE|PTP_RISING_EDGE|PTP_FALLING_EDGE   Time stamp both edges
    Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
    Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    6edd110b
igb_ptp.c 37.4 KB