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The classification operations that are used for RSS make use of several lookup tables. Having hit counters for these tables is really helpful to determine what flows were matched by ingress traffic, and see the path of packets among all the classifier tables. This commit adds hit counters for the 3 tables used at the moment : - The decoding table (also called lookup_id table), that links flows identified by the Header Parser to the flow table. There's one entry per flow, located at : .../mvpp2/<controller>/flows/XX/dec_hits Note that there are 21 flows in the decoding table, whereas there are 52 flows in the Header Parser. That's because there are several kind of traffic that will match a given flow. Reading the hit counter from one sub-flow will clear all hit counter that have the same flow_id. This also applies to the flow_hits. - The flow table, that contains all the different lookups to be performed by the classifier for each packet of a given flow. The match is done on the first entry of the flow sequence. - The C2 engine entries, that are used to assign the default rx queue, and enable or disable RSS for a given port. There's one entry per flow, located at: .../mvpp2/<controller>/flows/XX/flow_hits There is one C2 entry per port, so the c2 hit counter is located at : .../mvpp2/<controller>/ethX/c2_hits All hit counter values are 16-bits clear-on-read values. Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.