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Ido Schimmel says: ==================== mlxsw: Add VRRP support When a router that is acting as the default gateway of a host stops functioning, the host will encounter packet loss until the router starts functioning again. To increase the reliability of the default gateway without performing reconfiguration on the host, a host can use a Virtual Router Redundancy Protocol (VRRP) Router. This virtual router is composed from several routers where only one is actually forwarding packets from the host (the master router) while the other routers act as backup routers. The election of the master router is determined by the VRRP protocol [1]. Packets addressed to the virtual router are always sent to the virtual router MAC address (IPv4: 00-00-5E-00-01-XX, IPv6: 00-00-5E-00-02-XX). Such packets can only be accepted by the master router and must be discarded by the backup routers. In Linux, VRRP is usually implemented by configuring a macvlan with the virtual router MAC on top of the router interface that is connected to the host / LAN. The macvlan on the master router is assigned the virtual IP (VIP) that the host uses as its gateway. In order to support VRRP in mlxsw, we first need to enable macvlan upper devices on top of mlxsw netdevs and their uppers. This is done by the first patch, which also takes care of sanitizing macvlan configurations that are not currently supported by the driver. The second patch directs packets with destination MAC addresses as the macvlans to the router so that they will undergo an L3 lookup. This is consistent with the kernel's behavior where the macvlan's Rx handler will re-inject such packets to the Rx path so that they will be picked up by the IPvX protocol handlers and undergo an L3 lookup. Note that the driver prevents the macvlans from being enslaved to other devices, to ensure the packets will be picked up by the protocol handler and not by another Rx handler. The third patch adds packet traps for VRRP control packets for both IPv4 and IPv6. Finally, the last patch optimizes the reception of VRRP MACs by potentially skipping one L2 lookup for them. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.
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.