netdev - [PATCH net-next v2 09/13] net: airoha: ppe: Flush PPE SRAM table during PPE setup

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Message-Id: <20251016-an7583-eth-support-v2-9-ea6e7e9acbdb@kernel.org>
Date: Thu, 16 Oct 2025 12:28:23 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>, 
 Lorenzo Bianconi <lorenzo@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org, 
 devicetree@...r.kernel.org, Simon Horman <horms@...nel.org>
Subject: [PATCH net-next v2 09/13] net: airoha: ppe: Flush PPE SRAM table
 during PPE setup

Rely on airoha_ppe_foe_commit_sram_entry routine to flush SRAM PPE table
entries. This patch allow moving PPE SRAM flush during PPE setup and
avoid dumping uninitialized values via the debugfs if no entries are
offloaded yet.

Reviewed-by: Simon Horman <horms@...nel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/ethernet/airoha/airoha_ppe.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c
index 46755bc60a8e822b296e188c061c45eae0b88cb5..4b038673cefe20b47c42dd1419c05b57d4d6c64d 100644
--- a/drivers/net/ethernet/airoha/airoha_ppe.c
+++ b/drivers/net/ethernet/airoha/airoha_ppe.c
@@ -1291,18 +1291,22 @@ static int airoha_ppe_flow_offload_cmd(struct airoha_eth *eth,
 	return -EOPNOTSUPP;
 }

-static int airoha_ppe_flush_sram_entries(struct airoha_ppe *ppe,
-					 struct airoha_npu *npu)
+static int airoha_ppe_flush_sram_entries(struct airoha_ppe *ppe)
 {
 	u32 sram_num_entries = airoha_ppe_get_total_sram_num_entries(ppe);
 	struct airoha_foe_entry *hwe = ppe->foe;
-	int i;
+	int i, err = 0;
+
+	for (i = 0; i < sram_num_entries; i++) {
+		int err;

-	for (i = 0; i < PPE_SRAM_NUM_ENTRIES; i++)
 		memset(&hwe[i], 0, sizeof(*hwe));
+		err = airoha_ppe_foe_commit_sram_entry(ppe, i);
+		if (err)
+			break;
+	}

-	return npu->ops.ppe_flush_sram_entries(npu, ppe->foe_dma,
-					       sram_num_entries);
+	return err;
 }

 static struct airoha_npu *airoha_ppe_npu_get(struct airoha_eth *eth)
@@ -1339,10 +1343,6 @@ static int airoha_ppe_offload_setup(struct airoha_eth *eth)
 	}

 	airoha_ppe_hw_init(ppe);
-	err = airoha_ppe_flush_sram_entries(ppe, npu);
-	if (err)
-		goto error_npu_put;
-
 	airoha_ppe_foe_flow_stats_reset(ppe, npu);

 	rcu_assign_pointer(eth->npu, npu);
@@ -1513,6 +1513,10 @@ int airoha_ppe_init(struct airoha_eth *eth)
 	if (!ppe->foe_check_time)
 		return -ENOMEM;

+	err = airoha_ppe_flush_sram_entries(ppe);
+	if (err)
+		return err;
+
 	err = rhashtable_init(&eth->flow_table, &airoha_flow_table_params);
 	if (err)
 		return err;

-- 
2.51.0