[PATCH net v2 0/2] net: dsa: mv88e6xxx: 6141/6341 workarounds

[Luke Howard]

This patch series addresses two issues I found with the 88E6341
switch, which likely also apply to the 88E6141 (which is the same
chip without AVB/TSN support).

The first was a genuine bug, which assumed the chip did not have
a dedicated ATU FID register (it does).

The other is an issue I noticed with hash collisions in the ATU
on the 6341 when using multiple FIDs. Different algorithms could
be selected using devlink, but the FDB was not flushed which
resulted in a corrupted FDB.

Signed-off-by: Luke Howard <lukeh@xxxxxxxx>
---
Changes in v2:
- Rather than special casing ATU hash algorithm for the 6341, simply
  ensure the ATU is flushed when changing it via devlink.
- Retartget net instead of net-next, as this is a bugfix
- Link to v1: https://patch.msgid.link/20260703-mv88e6x41-fixes-v1-0-fbd3a1bf8965@xxxxxxxx

To: Andrew Lunn <andrew@xxxxxxx>
To: Vladimir Oltean <olteanv@xxxxxxxxx>
To: "David S. Miller" <davem@xxxxxxxxxxxxx>
To: Eric Dumazet <edumazet@xxxxxxxxxx>
To: Jakub Kicinski <kuba@xxxxxxxxxx>
To: Paolo Abeni <pabeni@xxxxxxxxxx>
To: Richard Cochran <richardcochran@xxxxxxxxx>
To: Vivien Didelot <vivien.didelot@xxxxxxxxx>
To: Gregory CLEMENT <gregory.clement@xxxxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx

---
Luke Howard (2):
      net: dsa: mv88e6xxx: write the ATU FID register on 88E6141/88E6341
      net: dsa: mv88e6xxx: flush the ATU when the hash algorithm changes

 drivers/net/dsa/mv88e6xxx/chip.c        | 29 ++++++++++++++++++++++++++++-
 drivers/net/dsa/mv88e6xxx/chip.h        | 12 +++++++++---
 drivers/net/dsa/mv88e6xxx/devlink.c     |  6 ++++++
 drivers/net/dsa/mv88e6xxx/global1_atu.c |  4 ++--
 4 files changed, 45 insertions(+), 6 deletions(-)
---
base-commit: fe3e786ef4eb6e47d2901f568a27bd920477bbe9
change-id: 20260624-mv88e6x41-fixes-d4c84f955ebc

Best regards,
--  
Luke Howard <lukeh@xxxxxxxx>