[RFC PATCH net-next 0/2] net: ti: icssg: Multi-flow RX and ethtool RX flow classification

[Meghana Malladi <m-malladi@ti.com>]

This series adds multi-flow RX support to the ICSSG ethernet driver and
exposes it via ethtool RX flow classification (rxnfc).

Patch (1/2): restructures the driver to support up to 8 independent RX flows
per EMAC interface. Each flow gets its own NAPI instance, IRQ, hrtimer,
page pool, and XDP/AF_XDP context while sharing a single UDMA channel and
descriptor pool. AF_XDP zero-copy is updated to track per-flow pools via a
bitmap, and per-flow page pool recycling is fixed by storing the flow_id in
prueth_swdata.

Patch (2/2): adds ethtool ETHTOOL_SRXCLSRLINS/SRXCLSRLDEL/SRXCLSRLALL support.
Rules match on EtherType (ETHER_FLOW) and steer matched frames to a
user-specified RX queue via ICSSG FT3 hardware content filters and the
16-entry classifier table. The classifier N result maps directly to UDMA
flow rx_flow_id_base+N, so queue steering takes effect in hardware without
per-packet CPU involvement.

Tested on AM64x EVM (SR2), both eth1 (PRU0/slice0) and eth2
(PRU1/slice1) with 8 RX flows. Verified via /proc/interrupts IRQ deltas:
  ethtool -N eth2 flow-type ether proto 0x0800 action 2  → flow2 +123 frames
  ethtool -N eth2 flow-type ether proto 0x0806 action 3  → flow3 +26 frames
  default flow0 leakage: +2

Meghana Malladi (2):
  icssg: Add multi-flow RX support with per-flow NAPI and classification
  icssg: Add ethtool RX flow classification support

 .../net/ethernet/ti/icssg/icssg_classifier.c  | 340 +++++++++++++++++
 drivers/net/ethernet/ti/icssg/icssg_common.c  | 359 ++++++++++--------
 drivers/net/ethernet/ti/icssg/icssg_config.h  |   7 +-
 drivers/net/ethernet/ti/icssg/icssg_ethtool.c |  65 +++-
 drivers/net/ethernet/ti/icssg/icssg_prueth.c  | 281 +++++++-------
 drivers/net/ethernet/ti/icssg/icssg_prueth.h  |  93 +++--
 .../net/ethernet/ti/icssg/icssg_prueth_sr1.c  |   4 +-
 7 files changed, 831 insertions(+), 318 deletions(-)


base-commit: 7b6ab4dbc156e2f96419715130b3d5738a306c93
-- 
2.43.0