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5a7e5bcb66
With new classifier type that doesn't require rtnl lock, following invariant holds: - Filter with specified cookie created only once. - Filter with specified cookie deleted only once. - Stats updates can be performed in parallel to each other. Extend tc flow with rcu and reference counter. To protect from concurrent delete, get reference to tc flow when: - Reading flow stats. - Accessing flow in neigh update handler. - Accessing flow in neigh update used value handler. Only free flow when reference counter reached zero. Modify flow cleanup to account for flows that could be not fully initialized by checking if flow is actually in the list of corresponding mod_hdr, hairpin and encap entries. Don't cleanup flow directly in case of error to allow concurrent neigh update (neigh update will be modified to always take reference to flow when using it). 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.