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Tony Nguyen says: ==================== 1GbE Intel Wired LAN Driver Updates 2022-07-28 Jacob Keller says: Convert all of the Intel drivers with PTP support to the newer .adjfine implementation which uses scaled parts per million. This improves the precision of the frequency adjustments by taking advantage of the full scaled parts per million input coming from user space. In addition, all implementations are converted to using the mul_u64_u64_div_u64 function which better handles the intermediate value. This function supports architecture specific instructions where possible to avoid loss of precision if the normal 64-bit multiplication would overflow. Of note, the i40e implementation is now able to avoid loss of precision on slower link speeds by taking advantage of this to multiply by the link speed factor first. This results in a significantly more precise adjustment by allowing the calculation to impact the lower bits. This also gets us a step closer to being able to remove the .adjfreq entirely by removing its use from many drivers. I plan to follow this up with a series to update the drivers from other vendors and drop the .adjfreq implementation entirely. * '1GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue: igb: convert .adjfreq to .adjfine ixgbe: convert .adjfreq to .adjfine i40e: convert .adjfreq to .adjfine i40e: use mul_u64_u64_div_u64 for PTP frequency calculation e1000e: convert .adjfreq to .adjfine e1000e: remove unnecessary range check in e1000e_phc_adjfreq ice: implement adjfine with mul_u64_u64_div_u64 ==================== Link: https://lore.kernel.org/r/20220728181836.3387862-1-anthony.l.nguyen@intel.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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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.