20cce88650
A MAC address is not necessarily a unique identifier for a netdev. Drivers such as Linux bonds, for example, can apply the same MAC address to the upper layer device and all lower layer devices. NFP MAC offload for tunnel decap includes port verification for reprs but also supports the offload of non-repr MAC addresses by assigning 'global' indexes to these. This means that the FW will not verify the incoming port of a packet matching this destination MAC. Modify the MAC offload logic to assign global indexes based on MAC address instead of net device (as it currently does). Use this to allow multiple devices to share the same MAC. In other words, if a repr shares its MAC address with another device then give the offloaded MAC a global index rather than associate it with an ingress port. Track this so that changes can be reverted as MACs stop being shared. Implement this by removing the current list based assignment of global indexes and replacing it with an rhashtable that maps an offloaded MAC address to the number of devices sharing it, distributing global indexes based on this. Signed-off-by: John Hurley <john.hurley@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.