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The XPCS driver was mangling the PMA identifier as the original code appears to have been focused on just capturing the OUI. Rather than store a mangled ID it is better to work with the actual PMA ID and instead just mask out the values that don't apply rather than shifting them and reordering them as you still don't get the original OUI for the NIC without having to bitswap the values as per the definition of the layout in IEEE 802.3-2022 22.2.4.3.1. By laying it out as it was in the hardware it is also less likely for us to have an unintentional collision as the enum values will occupy the revision number area while the OUI occupies the upper 22 bits. Signed-off-by: Alexander Duyck <alexanderduyck@fb.com> Link: https://patch.msgid.link/176374320920.959489.17267159479370601070.stgit@ahduyck-xeon-server.home.arpa Signed-off-by: Paolo Abeni <pabeni@redhat.com>