[PATCH net-next 0/6] net: bcmgenet: add XDP support

[Nicolai Buchwitz <nb@tipi-net.de>]

Add XDP support to the bcmgenet driver, covering XDP_PASS, XDP_DROP,
XDP_TX, XDP_REDIRECT, and ndo_xdp_xmit.

The first patch converts the RX path from the existing kmalloc-based
allocation to page_pool, which is a prerequisite for XDP. The remaining
patches incrementally add XDP functionality and per-action statistics.

Tested on Raspberry Pi CM4 (BCM2711, bcmgenet, 1Gbps link):
- XDP_PASS: 943 Mbit/s TX, 935 Mbit/s RX (no regression vs baseline)
- XDP_PASS latency: 0.164ms avg, 0% packet loss
- XDP_DROP: all inbound traffic blocked as expected
- XDP_TX: TX counter increments (packet reflection working)
- Link flap with XDP attached: no errors
- Program swap under iperf3 load: no errors

Nicolai Buchwitz (6):
  net: bcmgenet: convert RX path to page_pool
  net: bcmgenet: register xdp_rxq_info for each RX ring
  net: bcmgenet: add basic XDP support (PASS/DROP)
  net: bcmgenet: add XDP_TX support
  net: bcmgenet: add XDP_REDIRECT and ndo_xdp_xmit support
  net: bcmgenet: add XDP statistics counters

 drivers/net/ethernet/broadcom/Kconfig         |   1 +
 .../net/ethernet/broadcom/genet/bcmgenet.c    | 484 +++++++++++++++---
 .../net/ethernet/broadcom/genet/bcmgenet.h    |  17 +
 3 files changed, 425 insertions(+), 77 deletions(-)

-- 
2.51.0