[PATCH net-next v3 0/4] Add the capability to consume SRAM for hwfd descriptor queue in airoha_eth driver

[Lorenzo Bianconi <lorenzo@kernel.org>]

In order to improve packet processing and packet forwarding
performances, EN7581 SoC supports consuming SRAM instead of DRAM for hw
forwarding descriptors queue. For downlink hw accelerated traffic
request to consume SRAM memory for hw forwarding descriptors queue.
Moreover, in some configurations QDMA blocks require a contiguous block
of system memory for hwfd buffers queue. Introduce the capability to
allocate hw buffers forwarding queue via the reserved-memory DTS
property instead of running dmam_alloc_coherent().

---
Changes in v3:
- Remove hwfd references in airoha_qdma_struct in patch 2/4
- Split patch 2/2 in 3/4 and 4/4
- For downlink hw accelerated traffic request to consume SRAM memory for
  hw forwarding descriptors queue
- Fix comments
- Link to v2: https://lore.kernel.org/r/20250509-airopha-desc-sram-v2-0-9dc3d8076dfb@kernel.org

Changes in v2:
- fix sparse warnings
- Link to v1: https://lore.kernel.org/r/20250507-airopha-desc-sram-v1-0-d42037431bfa@kernel.org

---
Lorenzo Bianconi (4):
      dt-bindings: net: airoha: Add EN7581 memory-region property
      net: airoha: Do not store hfwd references in airoha_qdma struct
      net: airoha: Add the capability to allocate hwfd buffers via reserved-memory
      net: airoha: Add the capability to allocate hfwd descriptors in SRAM

 .../devicetree/bindings/net/airoha,en7581-eth.yaml | 13 ++++++
 drivers/net/ethernet/airoha/airoha_eth.c           | 50 ++++++++++++++--------
 drivers/net/ethernet/airoha/airoha_eth.h           | 15 ++++---
 drivers/net/ethernet/airoha/airoha_ppe.c           |  6 +++
 4 files changed, 60 insertions(+), 24 deletions(-)
---
base-commit: e6b3527c3b0a676c710e91798c2709cc0538d312
change-id: 20250507-airopha-desc-sram-faeb3ea6cbc5

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