[PATCH v3 net-next 0/8] add XDP support to mvneta driver

[Lorenzo Bianconi <lorenzo@kernel.org>]

Add XDP support to mvneta driver for devices that rely on software
buffer management. Supported verdicts are:
- XDP_DROP
- XDP_PASS
- XDP_REDIRECT
- XDP_TX
Moreover set ndo_xdp_xmit net_device_ops function pointer in order to support
redirecting from other device (e.g. virtio-net).
Convert mvneta driver to page_pool API.
This series is based on previous work done by Jesper and Ilias.
We will send follow-up patches to reduce DMA-sync operations.

Changes since v2:
- rely on page_pool_recycle_direct instead of xdp_return_buff for XDP_DROP
- define xdp buffer in mvneta_rx_swbm and avoid default initializations
- use dma_sync_single_for_cpu instead of dma_sync_single_range_for_cpu
- run page_pool_release_page in mvneta_swbm_add_rx_fragment even if the buffer
  contains just ETH_FCS

Changes since v1:
- sync dma buffers before refilling hw queues
- fix stats accounting

Changes since RFC:
- implement XDP_TX
- make tx pending buffer list agnostic
- code refactoring
- check if device is running in mvneta_xdp_setup

Lorenzo Bianconi (8):
  net: mvneta: introduce mvneta_update_stats routine
  net: mvneta: introduce page pool API for sw buffer manager
  net: mvneta: rely on build_skb in mvneta_rx_swbm poll routine
  net: mvneta: sync dma buffers before refilling hw queues
  net: mvneta: add basic XDP support
  net: mvneta: move header prefetch in mvneta_swbm_rx_frame
  net: mvneta: make tx buffer array agnostic
  net: mvneta: add XDP_TX support

 drivers/net/ethernet/marvell/Kconfig  |   1 +
 drivers/net/ethernet/marvell/mvneta.c | 631 +++++++++++++++++++-------
 2 files changed, 472 insertions(+), 160 deletions(-)

-- 
2.21.0