net: airoha: Add missing PPE configurations in airoha_ppe_hw_init()

[ Upstream commit b9d8b85 ]

Add the following PPE configuration in airoha_ppe_hw_init routine:
- 6RD hw offloading is currently not supported by Netfilter flowtable.
  Disable explicitly PPE 6RD offloading in order to prevent PPE to learn
  6RD flows and eventually interrupt the traffic.
- Add missing PPE bind rate configuration for L3 and L2 traffic.
  PPE bind rate configuration specifies the pps threshold to move a PPE
  entry state from UNBIND to BIND. Without this configuration this value
  is random.
- Set ageing thresholds to the values used in the vendor SDK in order to
  improve connection stability under load and avoid packet loss caused by
  fast aging.

Fixes: 00a7678 ("net: airoha: Introduce flowtable offload support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260412-airoha_ppe_hw_init-missing-bits-v1-1-06ac670819e3@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: LorenzoBianconi

drivers/net/ethernet/airoha/airoha_ppe.c

@@ -83,13 +83,13 @@ static void airoha_ppe_hw_init(struct airoha_ppe *ppe)
 		airoha_fe_rmw(eth, REG_PPE_BND_AGE0(i),
 			      PPE_BIND_AGE0_DELTA_NON_L4 |
 			      PPE_BIND_AGE0_DELTA_UDP,
-			      FIELD_PREP(PPE_BIND_AGE0_DELTA_NON_L4, 1) |
-			      FIELD_PREP(PPE_BIND_AGE0_DELTA_UDP, 12));
+			      FIELD_PREP(PPE_BIND_AGE0_DELTA_NON_L4, 60) |
+			      FIELD_PREP(PPE_BIND_AGE0_DELTA_UDP, 60));
 		airoha_fe_rmw(eth, REG_PPE_BND_AGE1(i),
 			      PPE_BIND_AGE1_DELTA_TCP_FIN |
 			      PPE_BIND_AGE1_DELTA_TCP,
 			      FIELD_PREP(PPE_BIND_AGE1_DELTA_TCP_FIN, 1) |
-			      FIELD_PREP(PPE_BIND_AGE1_DELTA_TCP, 7));
+			      FIELD_PREP(PPE_BIND_AGE1_DELTA_TCP, 60));
 
 		airoha_fe_rmw(eth, REG_PPE_TB_HASH_CFG(i),
 			      PPE_SRAM_TABLE_EN_MASK |
@@ -111,7 +111,15 @@ static void airoha_ppe_hw_init(struct airoha_ppe *ppe)
 			      FIELD_PREP(PPE_TB_CFG_SEARCH_MISS_MASK, 3) |
 			      FIELD_PREP(PPE_TB_ENTRY_SIZE_MASK, 0));
 
+		airoha_fe_rmw(eth, REG_PPE_BIND_RATE(i),
+			      PPE_BIND_RATE_L2B_BIND_MASK |
+			      PPE_BIND_RATE_BIND_MASK,
+			      FIELD_PREP(PPE_BIND_RATE_L2B_BIND_MASK, 0x1e) |
+			      FIELD_PREP(PPE_BIND_RATE_BIND_MASK, 0x1e));
+
 		airoha_fe_wr(eth, REG_PPE_HASH_SEED(i), PPE_HASH_SEED);
+		airoha_fe_clear(eth, REG_PPE_PPE_FLOW_CFG(i),
+				PPE_FLOW_CFG_IP6_6RD_MASK);
 
 		for (p = 0; p < ARRAY_SIZE(eth->ports); p++)
 			airoha_fe_rmw(eth, REG_PPE_MTU(i, p),