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The Spectrum ASICs have a fixed number of port range registers, each of which maintains the following parameters: * Minimum and maximum port. * Apply port range for source port, destination port or both. * Apply port range for TCP, UDP or both. * Apply port range for IPv4, IPv6 or both. Implement a port range core which takes care of the allocation and configuration of these registers and exposes an API that allows in-driver consumers (e.g., the ACL code) to request matching on a range of either source or destination port. These registers are going to be used for port range matching in the flower classifier that already matches on EtherType being IPv4 / IPv6 and IP protocol being TCP / UDP. As such, there is no need to limit these registers to a specific EtherType or IP protocol, which will increase the likelihood of a register being shared by multiple flower filters. It is unlikely that a filter will match on the same range of both source and destination ports, which is why each register is only configured to match on either source or destination port. If a filter requires matching on a range of both source and destination ports, it will utilize two port range registers and match on the output of both. For efficient lookup and traversal, use XArray to store the allocated port range registers. The XArray uses RCU and an internal spinlock to synchronise access, so there is no need for a dedicate lock. Signed-off-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: Petr Machata <petrm@nvidia.com> Signed-off-by: Petr Machata <petrm@nvidia.com> Link: https://lore.kernel.org/r/674f00539a0072d455847663b5feb504db51a259.1689092769.git.petrm@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.