[PATCH net-next v12 0/3] airoha: add the capability to configure GDM3/GDM4 as WAN/LAN on demand

Add the capability to configure GDM3/GDM4 as WAN/LAN on demand when QoS
offload is created or destroyed.
Make dev->qdma an RCU pointer so the TX path can safely dereference it
without holding RTNL.
Introduce airoha_qdma_start() and airoha_qdma_stop() helpers.

---
Changes in v12:
- Introduce txq_lock array in order to serialize the access to
  netdev_tx_completed_queue() in airoha_qdma_tx_napi_poll().
- Set AIROHA_DEV_F_TX_QOS flags in airoha_tc_setup_qdisc_htb() and not
  in airoha_enable_qos_for_gdm34().
- Link to v11: https://lore.kernel.org/r/[email protected]

Changes in v11:
- Fix possible bql races moving the net_device between different QDMA.
- Use atomic APIs for airoha_gdm_flags.
- Link to v10: https://lore.kernel.org/r/[email protected]

Changes in v10:
- Fix a theoretical race condition between tx completion NAPIs moving the
  net_device between different QDMA.
- Rebase on top of next-next main branch
- Link to v9: https://lore.kernel.org/r/[email protected]

Changes in v9:
- Rebase on top of next-next main branch
- Link to v8: https://lore.kernel.org/r/[email protected]

Changes in v8:
- Rebase on top of next-next to fix conflicts.
- Link to v7: https://lore.kernel.org/r/[email protected]

Changes in v7:
- Fix ETS stats accounting in patch 2/3
- Reset ETS stats accounting in airoha_dev_set_qdma().
- Link to v6: https://lore.kernel.org/r/[email protected]

Changes in v6:
- Rebase on top of next-next
- Add patch 1/3: "rename airoha_priv_flags to airoha_dev_flags"
- Drop patch 2/3: "refactor QDMA start/stop into reusable helpers"
- Link to v5: https://lore.kernel.org/r/[email protected]

Changes in v5:
- Add patch 1/3: use int instead of atomic_t for qdma users counter
- Protect dev->flags with flow_offload_mutex mutex.
- Introduce AIROHA_PRIV_F_QOS in order to handle better WAN/LAN
  switching.
- Link to v4: https://lore.kernel.org/r/[email protected]

Changes in v4:
- Move back QDMA TX/RX DMA enable to airoha_dev_open()/airoha_dev_stop().
- Configure GDM3/4 as WAN if GDM2 is not available in ndo_init()
  callback.
- Protect qdma pointer in airoha_gdm_dev struct using RCU.
- Rely on rtnl_dereference() to access qdma pointer in the control path.
- Add airoha_qdma_start() and airoha_qdma_stop() utility routines in
  patch 1/2
- Link to v3: https://lore.kernel.org/r/[email protected]

Changes in v3:
- Do not introduce ethtool private flags support to configure LAN/WAN
  for GDM3/4 and rely on tc qdisc offload for it instead.
- Set GDM3/4 ports as LAN by default.
- Move QDMA TX/RX DMA enable from airoha_dev_open() to airoha_probe()
  and the corresponding disable from airoha_dev_stop() to airoha_qdma_cleanup().
- Link to v2: https://lore.kernel.org/r/[email protected]

Changes in v2:
- Rework airoha_dev_set_wan_flag routine
- Enable GDM_STRIP_CRC_MASK in airoha_disable_gdm2_loopback()
- Do not always reset REG_SRC_PORT_FC_MAP6 in
  airoha_disable_gdm2_loopback() but use the same condition used in
  airoha_enable_gdm2_loopback().
- Link to v1: https://lore.kernel.org/r/[email protected]

---
Lorenzo Bianconi (3):
      net: airoha: rename airoha_priv_flags to airoha_dev_flags
      net: airoha: fix ETS QoS stats counter underflow and cross-channel corruption
      net: airoha: defer GDM3/GDM4 WAN mode and GDM2 loopback to QoS offload

 drivers/net/ethernet/airoha/airoha_eth.c  | 265 ++++++++++++++++++++++++++----
 drivers/net/ethernet/airoha/airoha_eth.h  |  33 +++-
 drivers/net/ethernet/airoha/airoha_ppe.c  |   9 +-
 drivers/net/ethernet/airoha/airoha_regs.h |   1 +
 4 files changed, 263 insertions(+), 45 deletions(-)
---
base-commit: 04026c998c24ac47eb76886b9790c5710b603eb4
change-id: 20260606-airoha-ethtool-priv_flags-b6aa70caa780

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