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EoIB is a fairly simple protocol in which raw Ethernet frames (excluding the CRC) are encapsulated within Infiniband Unreliable Datagrams, with a four-byte fixed EoIB header (which conveys no actual information). The Ethernet broadcast domain is provided by a multicast group, similar to the IPoIB IPv4 multicast group. The mapping from Ethernet MAC addresses to Infiniband address vectors is achieved by snooping incoming traffic and building a peer cache which can then be used to map a MAC address into a port GID. The address vector is completed using a path record lookup, as for IPoIB. Note that this requires every packet to include a GRH. Add basic support for EoIB devices. This driver is substantially derived from the IPoIB driver. There is currently no mechanism for automatically creating EoIB devices. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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