• Alexander Duyck's avatar
    fm10k: Add support for PTP · a211e013
    Alexander Duyck authored
    This change adds support for the Linux PTP Hardware clock and timestamping
    functionality provided by the hardware.  There are actually two cases that
    this timestamping is meant to support.
    
    The first case would be an ordinary clock scenario.  In this configuration
    the host interface does not have access to BAR 4.  However all of the host
    interfaces should be locked into the same boundary clock region and as such
    they are all on the same clock anyway.  With this being the case they can
    synchronize among themselves and only need to adjust the offset since they
    are all on the same clock with the same frequency.
    
    The second case is a boundary clock scenario.  This is a special case and
    would require both BAR 4 access, and a means of presenting a netdev per
    boundary region.  The current plan is to use DSA at some point in the
    future to provide these interfaces, but the DSA portion is still under
    development.
    Signed-off-by: default avatarAlexander Duyck <alexander.h.duyck@intel.com>
    Acked-by: default avatarRichard Cochran <richardcochran@gmail.com>
    Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
    a211e013
fm10k_ptp.c 12.7 KB