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net: dsa: mt7530: implement port_change_conduit op

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Allow changing the CPU port affinity of user ports at runtime via the
IFLA_DSA_CONDUIT netlink attribute. This updates the port matrix to
forward to the new CPU port instead of the old one.

Limit the operation to MT7531. There, trapped link-local frames follow
the per-port affinity, as the MT7531_CPU_PMAP destination mask is
further restricted by the port matrix. A conduit change is hence fully
honoured by the hardware, for regular traffic as well as for trapped
frames.

The MT7530 switch, including the variant embedded in the MT7621 SoC,
instead traps frames to the single CPU port set in the CPU_PORT field
of the MFC register, regardless of the affinity of the inbound user
port. With user ports affine to different CPU ports there is no
correct value for that field, so per-port CPU affinity cannot be fully
implemented for trapped frames. Routing a WAN port via the second SoC
GMAC is conventionally covered by the PHY muxing feature on these
switches, which bypasses the switch fabric and does not involve a CPU
port at all.

The switches on the MT7988, EN7581, AN7583 and EN7528 SoCs only have a
single CPU port, leaving no other conduit to change to.

As the op lives in the shared mt7530_switch_ops, populate the extack
when rejecting the unsupported variants instead of returning a bare
-EOPNOTSUPP. Also reject a conduit that belongs to a different switch
in the tree, whose port index has no meaning in the local port matrix.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Acked-by: Chester A. Unal <chester.a.unal@arinc9.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/cfc6a478a384a7f309f08d9f76be8fd029c1f202.1788190568.git.daniel@makrotopia.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Daniel Golle 2026-08-31 16:39:26 +01:00 • committed by Jakub Kicinski
commit e5ed29f156
1 changed files with 38 additions and 0 deletions
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