0f51fa2a3c
Vladimir Oltean says: ==================== Fixes for Felix DSA driver calculation of tc-taprio guard bands This series fixes some bugs which are not quite new, but date from v5.13 when static guard bands were enabled by Michael Walle to prevent tc-taprio overruns. The investigation started when Xiaoliang asked privately what is the expected max SDU for a traffic class when its minimum gate interval is 10 us. The answer, as it turns out, is not an L1 size of 1250 octets, but 1245 octets, since otherwise, the switch will not consider frames for egress scheduling, because the static guard band is exactly as large as the time interval. The switch needs a minimum of 33 ns outside of the guard band to consider a frame for scheduling, and the reduction of the max SDU by 5 provides exactly for that. The fix for that (patch 1/3) is relatively small, but during testing, it became apparent that cut-through forwarding prevents oversized frame dropping from working properly. This is solved through the larger patch 2/3. Finally, patch 3/3 fixes one more tc-taprio locking problem found through code inspection. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.