[PATCH net-next v2 00/11] net: airoha: Support multiple net_devices connected to the same GDM port

[Lorenzo Bianconi <lorenzo@kernel.org>]

EN7581 or AN7583 SoCs support connecting multiple external SerDes (e.g.
Ethernet or USB SerDes) to GDM3 or GDM4 ports via a hw arbiter that
manages the traffic in a TDM manner. As a result multiple net_devices can
connect to the same GDM{3,4} port and there is a theoretical "1:n"
relation between GDM ports and net_devices.

           ┌─────────────────────────────────┐
           │                                 │    ┌──────┐
           │                         P1 GDM1 ├────►MT7530│
           │                                 │    └──────┘
           │                                 │      ETH0 (DSA conduit)
           │                                 │
           │              PSE/FE             │
           │                                 │
           │                                 │
           │                                 │    ┌─────┐
           │                         P0 CDM1 ├────►QDMA0│
           │  P4                     P9 GDM4 │    └─────┘
           └──┬─────────────────────────┬────┘
              │                         │
           ┌──▼──┐                 ┌────▼────┐
           │ PPE │                 │   ARB   │
           └─────┘                 └─┬─────┬─┘
                                     │     │
                                  ┌──▼──┐┌─▼───┐
                                  │ ETH ││ USB │
                                  └─────┘└─────┘
                                   ETH1   ETH2

This series introduces support for multiple net_devices connected to the
same Frame Engine (FE) GDM port (GDM3 or GDM4) via an external hw
arbiter. Please note GDM1 or GDM2 does not support the connection with
the external arbiter.

---
Changes in v2:
- Rename multiplexer in arbiter in the commit logs.
- Rebase on top of net-next main branch.
- Add missing PPE cpu port configuration for GDM2 when loopback is
  enabled.
- Link to v1: https://lore.kernel.org/r/20260329-airoha-eth-multi-serdes-v1-0-00f52dc360ca@kernel.org

---
Lorenzo Bianconi (11):
      dt-bindings: net: airoha: Add EN7581 ethernet-ports properties
      net: airoha: Set PPE cpu port for GDM2 if loopback is enabled
      net: airoha: Rely on net_device pointer in airoha_dev_setup_tc_block signature
      net: airoha: Rely on net_device pointer in HTB callbacks
      net: airoha: Rely on net_device pointer in ETS callbacks
      net: airoha: Introduce airoha_gdm_dev struct
      net: airoha: Move airoha_qdma pointer in airoha_gdm_dev struct
      net: airoha: Rely on airoha_gdm_dev pointer in airhoa_is_lan_gdm_port()
      net: airoha: Support multiple net_devices for a single FE GDM port
      net: airoha: Do not stop GDM port if it is shared
      net: airoha: Rename get_src_port_id callback in get_sport

 .../devicetree/bindings/net/airoha,en7581-eth.yaml |  44 +-
 drivers/net/ethernet/airoha/airoha_eth.c           | 631 +++++++++++++--------
 drivers/net/ethernet/airoha/airoha_eth.h           |  30 +-
 drivers/net/ethernet/airoha/airoha_ppe.c           |  43 +-
 4 files changed, 502 insertions(+), 246 deletions(-)
---
base-commit: f1359c240191e686614847905fc861cbda480b47
change-id: 20260324-airoha-eth-multi-serdes-fb4b556ee756

Best regards,
-- 
Lorenzo Bianconi <lorenzo@kernel.org>