Subject: [PATCH net-next 0/6] net: airoha: Preliminary patches to support multiple net_devices connected to the same GDM port

From: Lorenzo Bianconi <[email-masked]>
Date: Wed, 27 May 2026 12:21:14 +0200

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 is a preliminary series to introduce support for multiple net_devices
connected to the same Frame Engine (FE) GDM port (GDM3 or GDM4) via an
external hw arbiter.

---
Lorenzo Bianconi (6):
      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 airoha_is_lan_gdm_port()
      net: airoha: Move qos_sq_bmap in airoha_gdm_dev struct
      net: airoha: Move {cpu,fwd}_tx_packets in airoha_gdm_dev struct
      net: airoha: Rename airoha_set_gdm2_loopback in airoha_enable_gdm2_loopback

 drivers/net/ethernet/airoha/airoha_eth.c | 445 ++++++++++++++++++-------------
 drivers/net/ethernet/airoha/airoha_eth.h |  35 ++-
 drivers/net/ethernet/airoha/airoha_ppe.c |  34 +--
 3 files changed, 297 insertions(+), 217 deletions(-)
---
base-commit: aa064a614efcfa4c300609d1f01134e99a12ad10
change-id: 20260527-airoha-eth-multi-serdes-preliminary-51204fb642fc

Best regards,
-- 
Lorenzo Bianconi <[email-masked]>