From: Nazim Amirul <redacted>

This series fixes three bugs in the stmmac L3/L4 TC flower filter
implementation for the XGMAC2 core. All three patches target net.

The L3/L4 filter match count statistics patch (originally patch 4/4)
has been split out and will be sent separately against net-next per
Andrew Lunn's review of v1.

Patch 1 fixes a register corruption bug in the L4 filter port configuration.
The XGMAC_L4_ADDR register holds both source and destination port match
values in a single register. The original code overwrites the entire register
when setting either field, silently erasing the other. This is fixed by
using a read-modify-write sequence.

Patch 2 fixes the basic flow match parser to properly reject unsupported
offload requests with -EOPNOTSUPP instead of silently accepting them.
Unsupported cases include partial protocol masks, non-IPv4 network proto,
and non-TCP/UDP transport proto. Extack messages are now included so users
know exactly which part of the match is unsupported. The -EOPNOTSUPP is
also now returned directly instead of using break, which was silently
discarding the error on FLOW_CLS_REPLACE operations.

Patch 3 fixes a stale action bug on filter deletion. When a filter entry
with a drop action is deleted, the action field was not reset, causing
it to persist and potentially affect subsequent filter configurations.

All three patches fix the original L3/L4 filter implementation introduced in
425eabddaf0f ("net: stmmac: Implement L3/L4 Filters using TC Flower").

Changes in v3:
- Patch 2: add extack messages to each -EOPNOTSUPP return (Jakub Kicinski)
- Patch 2: return -EOPNOTSUPP directly instead of break to avoid silently
  reporting success on unsupported FLOW_CLS_REPLACE (Sashiko review)

Changes in v2:
- Split patch 4/4 (ethtool stats) out to net-next per Andrew Lunn's review

Nazim Amirul (3):
  net: stmmac: xgmac: fix l4 filter port overwrite on register update
  net: stmmac: fix l3l4 filter rejecting unsupported offload requests
  net: stmmac: reset residual action in L3L4 filters on delete

 .../ethernet/stmicro/stmmac/dwxgmac2_core.c   | 28 +++++++++++--------
 .../net/ethernet/stmicro/stmmac/stmmac_tc.c   | 35 +++++++++++++++++++
 2 files changed, 49 insertions(+), 12 deletions(-)

-- 
2.43.7