[PATCH net v5 0/4] net: mvpp2: fix XDP RX buffer handling

[Til Kaiser <mail@tk154.de>]

This is v5 of the earlier XDP_PASS fix. The XDP_PASS change is
retained, and the series also fixes related RX/XDP buffer handling
issues found during review.

Tested with tools/testing/selftests/drivers/net/xdp.py on mvpp2
hardware.

---
v1: https://lore.kernel.org/all/20260524122334.1730451-1-mail@tk154.de/
v2: https://lore.kernel.org/all/20260602164635.62517-1-mail@tk154.de/
v3: https://lore.kernel.org/all/20260605121332.147397-1-mail@tk154.de/
v4: https://lore.kernel.org/all/20260605154457.163304-1-mail@tk154.de/

Changes in v5:
- Kept a separate page-pool recycle sync length for skb allocation
  failure, which must stay tied to the received buffer range.

Changes in v4:
- Reposted as a new independent thread, no code changes.

Changes in v3:
- Reworked RX refill failure handling to preserve BM pool depth by
  refilling before the current buffer is consumed by XDP or an skb.

Changes in v2:
- Fixed RX DMA sync range to account for RX headroom.
- Limited XDP frame size to the actual RX buffer size.
- Fixed refill error paths so retired buffers are not returned to BM.

Til Kaiser (4):
  net: mvpp2: sync RX data at the hardware packet offset
  net: mvpp2: limit XDP frame size to the RX buffer
  net: mvpp2: refill RX buffers before XDP or skb use
  net: mvpp2: build skb from XDP-adjusted data on XDP_PASS

 .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 67 ++++++++++++-------
 1 file changed, 41 insertions(+), 26 deletions(-)

-- 
2.54.0