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0ae3eb7b46
Currently, netdevsim implements dummy FIB offload and marks notified routes with RTM_F_TRAP flag. netdevsim does not defer route notifications to a work queue because it does not need to program any hardware. Given that netdevsim's purpose is to both give an example implementation and allow developers to test their code, align netdevsim to a "real" hardware device driver like mlxsw and have it also perform the route "programming" in a non-atomic context. It will be used to test route flags notifications which will be added in the next patches. The following changes are needed when route handling is performed in WQ: - Handle the accounting in the main context, to be able to return an error for adding route when all the routes are used. For FIB_EVENT_ENTRY_REPLACE increase the counter before scheduling the delayed work, and in case that this event replaces an existing route, decrease the counter as part of the delayed work. - For IPv6, cannot use fen6_info->rt->fib6_siblings list because it might be changed during handling the delayed work. Save an array with the nexthops as part of fib6_event struct, and take a reference for each nexthop to prevent them from being freed while event is queued. - Change GFP_ATOMIC allocations to GFP_KERNEL. - Use single work item that is handling a list of ordered routes. Handling routes must be processed in the order they were submitted to avoid logical errors that could lead to unexpected failures. Signed-off-by: Amit Cohen <amcohen@nvidia.com> Signed-off-by: Ido Schimmel <idosch@nvidia.com> Acked-by: David Ahern <dsahern@kernel.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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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.
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.