forked from Minki/linux
mainlining shenanigans
2030eddced
Tony Nguyen says: ==================== 100GbE Intel Wired LAN Driver Updates 2021-12-21 This series contains updates to ice driver only. Karol modifies the reset flow to correct issues with PTP reset. Jake extends PTP support for E822 based devices. This includes a few cleanup patches, that fix some minor issues. 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 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 PHY is a bit different and requires a more complex initialization procedure which must be rerun any time the link configuration changes. *) 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 and receipt. Making use of this requires data gathered from the first transmitted and received packets, and waiting for the PHY to complete the calibration measurements. This is done as part of a new kthread, ov_work. Note that to avoid delay in enabling timestamps, we start the PHY in 'bypass' mode which allows timestamps to be captured without the Vernier calibration measurement. Once the first packets have been sent and received, we then complete the calibration setup and exit bypass mode and begin using the more precise timestamps. According to the datasheet, timestamps without calibration data can be incorrect relative to actual receipt or transmission by up to 1 clock cycle (~1.25 nanoseconds), while calibrated timestamps should be correct to within 1/8th of a clock cycle (~0.15 nanoseconds). *) 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. * '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue: ice: support crosstimestamping on E822 devices if supported ice: exit bypass mode once hardware finishes timestamp calibration ice: ensure the hardware Clock Generation Unit is configured ice: implement basic E822 PTP support ice: convert clk_freq capability into time_ref ice: introduce ice_ptp_init_phc function ice: use 'int err' instead of 'int status' in ice_ptp_hw.c ice: PTP: move setting of tstamp_config ice: introduce ice_base_incval function ice: Fix E810 PTP reset flow ==================== Link: https://lore.kernel.org/r/20211221174845.3063640-1-anthony.l.nguyen@intel.com Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.