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a2e4a21906
Jiri Pirko says: ==================== mlxsw: Add support for offloading IPv4 multicast routes Yotam says: This patch-set introduces offloading of the kernel IPv4 multicast router logic in the Spectrum driver. The first patch makes the Spectrum driver ignore FIB notifications that are not of address family IPv4 or IPv6. This is needed in order to prevent crashes while the next patches introduce the RTNL_FAMILY_IPMR FIB notifications. Patches 2-5 update ipmr to use the FIB notification chain for both MFC and VIF notifications, and patches 8-12 update the Spectrum driver to register to these notifications and offload the routes. Similarly to IPv4 and IPv6, any failure will trigger the abort mechanism which is updated in this patch-set to eject multicast route tables too. At this stage, the following limitations apply: - A multicast MFC route will be offloaded by the driver if all the output interfaces are Spectrum router interfaces (RIFs). In any other case (which includes pimreg device, tunnel devices and management ports) the route will be trapped to the CPU and the packets will be forwarded by software. - ipmr proxy routes are not supported and will trigger the abort mechanism. - The MFC TTL values are currently treated as boolean: if the value is different than 255, the traffic is forwarded to the interface and if the value is 255 it is not forwarded. Dropping packets based on their TTL isn't currently supported. To allow users to have visibility on which of the routes are offloaded and which are not, patch 6 introduces a per-route offload indication similar to IPv4 and IPv6 routes which is sent to the user via the RTNetlink interface. The Spectrum driver multicast router offloading support, which is introduced in patches 8 and 9, is divided into two parts: - The hardware logic which abstracts the Spectrum hardware and provides a simple API for the upper levels. - The offloading logic which gets the MFC and VIF notifications from the kernel and updates the hardware using the hardware logic part. Finally, the last patch makes the Spectrum router logic not ignore the multicast FIB notifications and call the corresponding functions in the multicast router offloading logic. --- v2->v3: - Move the ipmr_rule_default function definition to be inside the already existing CONFIG_IP_MROUTE_MULTIPLE_TABLES ifdef block (patch 6) - Remove double =0 initialization in spectrum_mr.c (patch 7) - Fix route4 allocation size (patch 7) v1->v2: - Add comments for struct fields in mroute.h - Take the mrt_lock while dumping VIFs in the fib_notifier dump callback - Update the MFC lastuse field too ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.