--- Documentation/about/architecture.adoc | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/about/architecture.adoc b/Documentation/about/architecture.adoc index e32ab27..2b86616 100644 --- a/Documentation/about/architecture.adoc +++ b/Documentation/about/architecture.adoc @@ -68,3 +68,23 @@ nix-build img/live --no-out-link | xargs -o nix-tree See the https://diode.zone/w/8DBDQ6HQUe5UUdLkpDuL35[video] of Spectrum live image interactive analysis with nix-tree. + +== Networking + +The net-vm's purpose is running the Linux drivers for any physical +interfaces on the spectrum system. + +A net-vm (there could be multiple, one per IOMMU-group) will load the +xdp-forwarder XDP programs on the passed-through physical interfaces as well +as the downstream virtio interface going into the router (recognized by +its special MAC address) using mdev events. + +The net-vm needs to multiplex between the physical interfaces, as there +might be several interfaces in the same IOMMU-group. + +For this, the xdp-forwarder applies a +VLAN tag corresponding to the interface id, and redirects the packets to +the router interface (identified by the router_iface bpf map). +In the other direction the XDP program loaded on the router interface +removes one layer of VLAN tagging, and redirects the packets to the +interface read from the VLAN tag. -- 2.50.1