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Make out-of-band testing (send a packet when its traffic class gate is closed, expecting it to be delayed) more predictable by allowing the window size to be customized by isochron_do(). From man isochron-send, the window size alters the advance time (the delta between the transmission time of the packet, and its expected TX time when using SO_TXTIME or tc-taprio on the sender). In absence of the argument, isochron-send defaults to maximizing the advance time (making it equal to the cycle length). The default behavior is exactly what is problematic. An advance time that is too large will make packets intended to be out-of-band still be potentially in-band with an open gate from the schedule's previous cycle. We need to allow that advance time to be reduced. Perhaps a bit confusingly, isochron_do() has a shift_time argument currently, but that does not help here. The shift time shifts both the user space wakeup time and the expected TX time by equal amounts, it is unable of bringing them closer to one another. Set the window size properly for the Ocelot PSFP selftest as well. That used to work due to a very carefully chosen SHIFT_TIME_NS. I've re-tested that the test still works properly. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://patch.msgid.link/20250426144859.3128352-4-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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 reStructuredText 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.