c5d326b296
In order to remove dependency on rtnl lock, access to tc flows hashtable must be explicitly protected from concurrent flows removal. Extend tc flow structure with rcu to allow concurrent parallel access. Use rcu read lock to safely lookup flow in tc flows hash table, and take reference to it. Use rcu free for flow deletion to accommodate concurrent stats requests. Add new DELETED flow flag. Imlement new flow_flag_test_and_set() helper that is used to set a flag and return its previous value. Use it to atomically set the flag in mlx5e_delete_flower() to guarantee that flow can only be deleted once, even when same flow is deleted concurrently by multiple tasks. Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Reviewed-by: Jianbo Liu <jianbol@mellanox.com> Reviewed-by: Roi Dayan <roid@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
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.