net: pcs: xpcs: Fix PMA identifier handling in XPCS

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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>

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This commit is contained in:

Alexander Duyck 2025-11-21 08:40:09 -08:00 • committed by Paolo Abeni

parent 7622d55276

commit 39e138173a

3 changed files with 10 additions and 6 deletions

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9

drivers/net/pcs/pcs-xpcs.c

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2

include/linux/pcs/pcs-xpcs.h

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5

include/uapi/linux/mdio.h

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