[PATCH 0/4] net: stmmac: L3/L4 filter fixes and improvements

[muhammad . nazim . amirul . nazle . asmade]

From: Nazim Amirul <muhammad.nazim.amirul.nazle.asmade@xxxxxxxxxx>

This series addresses several issues in the stmmac L3/L4 TC flower filter
implementation for the XGMAC2 core.

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.

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.

Patch 4 adds L3/L4 filter match counting to the ethtool statistics by
reading the L3FM and L4FM bits from the RX descriptor status word (RDES2),
allowing users to observe filter hit rates via ethtool -S.

Patches 1-3 all fix the original L3/L4 filter implementation introduced in
425eabddaf0f ("net: stmmac: Implement L3/L4 Filters using TC Flower").

Nazim Amirul (4):
  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
  net: stmmac: xgmac: report L3/L4 filter match count in ethtool stats

 .../net/ethernet/stmicro/stmmac/dwxgmac2.h    |  2 ++
 .../ethernet/stmicro/stmmac/dwxgmac2_core.c   | 28 +++++++++++--------
 .../ethernet/stmicro/stmmac/dwxgmac2_descs.c  |  6 ++++
 .../net/ethernet/stmicro/stmmac/stmmac_tc.c   | 27 ++++++++++++++++++
 4 files changed, 51 insertions(+), 12 deletions(-)

-- 
2.43.7