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Jiri Pirko says: ==================== mlxsw: GRE: Offload decap without encap Petr says: The current code doesn't offload GRE decapsulation unless there's a corresponding encapsulation route as well. While not strictly incorrect (when encap route is absent, the decap route traps traffic to CPU and the kernel handles it), it's a missed optimization opportunity. With this patchset, IPIP entries are created as soon as offloadable tunneling netdevice is created. This then leads to offloading of decap route, if one exists, or is added afterwards, even when no encap route is present. In Linux, when there is a decap route, matching IP-in-IP packets are always decapsulated. However, with IPv4 overlays in particular, whether the inner packet is then forwarded depends on setting of net.ipv4.conf.*.rp_filter. When RP filtering is turned on, inner packets aren't forwarded unless there's a matching encap route. The mlxsw driver doesn't reflect this behavior in other router interfaces, and thus it's not implemented for tunnel types either. A better support for this will be subject of follow-up work. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.