netdev - [PATCH net-next 1/2] net: stmmac: restructure tc implementation for RX VLAN Priority steering

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Date:   Fri, 19 Mar 2021 01:22:03 +0800
From:   Ong Boon Leong <boon.leong.ong@...el.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Ong Boon Leong <boon.leong.ong@...el.com>
Subject: [PATCH net-next 1/2] net: stmmac: restructure tc implementation for RX VLAN Priority steering

The current tc_add_flow() and tc_del_flow() use hardware L3 & L4 filters
as offloading. The number of L3/L4 filters is read from L3L4FNUM field
from MAC_HW_Feature1 register and is used to alloc priv->tc_entries[].

For RX frame steering based on VLAN priority offloading, we use
MAC_RXQ_CTRL2 & MAC_RXQ_CTRL3 registers and all VLAN priority level
can be configured independent from L3 & L4 filters.

Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
---
 .../net/ethernet/stmicro/stmmac/stmmac_tc.c   | 24 +++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
index 44bb133c3000..f4d8d7980ec5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c
@@ -598,6 +598,26 @@ static int tc_del_flow(struct stmmac_priv *priv,
 	return ret;
 }
 
+static int tc_add_flow_cls(struct stmmac_priv *priv,
+			   struct flow_cls_offload *cls)
+{
+	int ret;
+
+	ret = tc_add_flow(priv, cls);
+
+	return ret;
+}
+
+static int tc_del_flow_cls(struct stmmac_priv *priv,
+			   struct flow_cls_offload *cls)
+{
+	int ret;
+
+	ret = tc_del_flow(priv, cls);
+
+	return ret;
+}
+
 static int tc_setup_cls(struct stmmac_priv *priv,
 			struct flow_cls_offload *cls)
 {
@@ -609,10 +629,10 @@ static int tc_setup_cls(struct stmmac_priv *priv,
 
 	switch (cls->command) {
 	case FLOW_CLS_REPLACE:
-		ret = tc_add_flow(priv, cls);
+		ret = tc_add_flow_cls(priv, cls);
 		break;
 	case FLOW_CLS_DESTROY:
-		ret = tc_del_flow(priv, cls);
+		ret = tc_del_flow_cls(priv, cls);
 		break;
 	default:
 		return -EOPNOTSUPP;
-- 
2.25.1