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VXLAN FDB entries can point to FDB nexthop objects. Each such object includes the IP address(es) of remote VTEP(s) via which the target host is accessible. Example: # ip nexthop add id 1 via 192.0.2.1 fdb # ip nexthop add id 2 via 192.0.2.17 fdb # ip nexthop add id 1000 group 1/2 fdb # bridge fdb add 00:11:22:33:44:55 dev vx0 self static nhid 1000 src_vni 10020 This is useful for EVPN multihoming where a single host can be connected to multiple VTEPs. The source VTEP will calculate the flow hash of the skb and forward it towards the IP address of one of the VTEPs member in the nexthop group. There are cases where an external entity (e.g., the bridge driver) can provide not only the tunnel ID (i.e., VNI) of the skb, but also the ID of the nexthop object via which the skb should be forwarded. Therefore, in order to support such cases, when the VXLAN device is in external / collect metadata mode and the tunnel info attached to the skb is of bridge type, extract the nexthop ID from the tunnel info. If the ID is valid (i.e., non-zero), forward the skb via the nexthop object associated with the ID, as if the skb hit an FDB entry associated with this ID. Signed-off-by: Ido Schimmel <idosch@nvidia.com> Acked-by: Nikolay Aleksandrov <razor@blackwall.org> 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.
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.