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[net-next,v2,00/13] ice: implement support for PTP on E822 hardware

Message ID 20210701220456.3882767-1-jacob.e.keller@intel.com
Headers show
Series ice: implement support for PTP on E822 hardware | expand

Message

Keller, Jacob E July 1, 2021, 10:04 p.m. UTC 
Extend the ice driver implementation to support PTP for the E822 based
devices.

This includes a few cleanup patches, that fix some minor issues spotted
while preparing them. In addition, there are some slight refactors to ease
the addition of E822 support, followed by adding the new hardware
implementation ice_ptp_hw.c.

There are a few major differences with E822 support compared to E810
support:

*) The E822 PHY is a bit different and requires a more complex
initialization procedure that requires delaying the PHY start until link is
up
*) The E822 device has a Clock Generation Unit which must be initialized in
order to generate proper clock frequencies on the output that drives the PTP
hardware clock registers
*) The E822 devices support enhanced timestamp calibration by making use of
a process called Vernier offset measurement. This allows the hardware to
measure phase offset related to the PHY clocks for Serdes and FEC, reducing
the inaccuracy of the timestamp relative to the actual packet transmission.
Making use of this requires programming the PHY to enable vernier
calibration and then detecting when the PHY has completed calibration. This
is done as part of a new kthread, ov_work.
*) E822 devices support crosstimestamping via PCIe PTM, which we enable when
available on the platform.

There is a fair amount of logic required to perform PHY and CGU
initialization, which is the vast majority of the new code, but it is fairly
self contained within ice_ptp_hw.c, with the exception of monitoring for
offset validity being handled by a kthread.

Changes since v1:
* Rebased on top of IWL to resolve conflict
* Fixed build against non-X86 arch for the PCIe PTM support

Jacob Keller (13):
  ice: fix Tx queue iteration for Tx timestamp enablement
  ice: remove dead code for allocating pin_config
  ice: add lock around Tx timestamp tracker flush
  ice: restart periodic outputs around time changes
  ice: introduce ice_base_incval function
  ice: PTP: move setting of tstamp_config
  ice: use 'int err' instead of 'int status'
  ice: introduce ice_ptp_init_phc function
  ice: convert clk_freq capability into time_ref
  ice: implement basic E822 PTP support
  ice: ensure the hardware Clock Generation Unit is configured
  ice: exit bypass mode once hardware finishes timestamp calibration
  ice: support crosstimestamping on E822 devices if supported

 drivers/net/ethernet/intel/Kconfig            |   10 +
 drivers/net/ethernet/intel/ice/ice_cgu_regs.h |  116 +
 drivers/net/ethernet/intel/ice/ice_common.c   |   12 +
 .../net/ethernet/intel/ice/ice_hw_autogen.h   |    9 +
 drivers/net/ethernet/intel/ice/ice_main.c     |    7 +
 drivers/net/ethernet/intel/ice/ice_ptp.c      |  698 +++-
 drivers/net/ethernet/intel/ice/ice_ptp.h      |   30 +-
 .../net/ethernet/intel/ice/ice_ptp_consts.h   |  374 +++
 drivers/net/ethernet/intel/ice/ice_ptp_hw.c   | 2794 ++++++++++++++++-
 drivers/net/ethernet/intel/ice/ice_ptp_hw.h   |  345 ++
 drivers/net/ethernet/intel/ice/ice_type.h     |   23 +-
 11 files changed, 4207 insertions(+), 211 deletions(-)
 create mode 100644 drivers/net/ethernet/intel/ice/ice_cgu_regs.h
 create mode 100644 drivers/net/ethernet/intel/ice/ice_ptp_consts.h


base-commit: 6e3c27180bcf2635f537ff63164e8df9773b56fb