• Christopher S. Hall's avatar
    e1000e: Adds hardware supported cross timestamp on e1000e nic · 01d7ada5
    Christopher S. Hall authored
    Modern Intel systems supports cross timestamping of the network device
    clock and Always Running Timer (ART) in hardware.  This allows the
    device time and system time to be precisely correlated. The timestamp
    pair is returned through e1000e_phc_get_syncdevicetime() used by
    get_system_device_crosststamp().  The hardware cross-timestamp result
    is made available to applications through the PTP_SYS_OFFSET_PRECISE
    ioctl which calls e1000e_phc_getcrosststamp().
    
    Cc: Prarit Bhargava <prarit@redhat.com>
    Cc: Richard Cochran <richardcochran@gmail.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@kernel.org>
    Cc: Andy Lutomirski <luto@amacapital.net>
    Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
    Cc: kevin.b.stanton@intel.com
    Cc: kevin.j.clarke@intel.com
    Cc: hpa@zytor.com
    Cc: jeffrey.t.kirsher@intel.com
    Cc: netdev@vger.kernel.org
    Acked-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
    Signed-off-by: default avatarChristopher S. Hall <christopher.s.hall@intel.com>
    [jstultz: Reworked to use new interface, commit message tweaks]
    Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
    01d7ada5
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