linux-kernel - [PATCH net-next] net: renesas: rswitch: enable only used MFWD features

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Message-Id: <20241209062411.152927-1-nikita.yoush@cogentembedded.com>
Date: Mon,  9 Dec 2024 11:24:11 +0500
From: Nikita Yushchenko <nikita.yoush@...entembedded.com>
To: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	Andrew Lunn <andrew@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>
Cc: netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Michael Dege <michael.dege@...esas.com>,
	Christian Mardmoeller <christian.mardmoeller@...esas.com>,
	Dennis Ostermann <dennis.ostermann@...esas.com>,
	Nikita Yushchenko <nikita.yoush@...entembedded.com>
Subject: [PATCH net-next] net: renesas: rswitch: enable only used MFWD features

Currently, rswitch driver does not utilize most of MFWD forwarding
and processing features. It only uses port-based forwarding for ETHA
ports, and direct descriptor forwarding for GWCA port.

Update rswitch_fwd_init() to enable exactly that, and keep everything
else disabled.

Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>
---
 drivers/net/ethernet/renesas/rswitch.c | 30 +++++++++++++++++---------
 drivers/net/ethernet/renesas/rswitch.h | 14 ++++++------
 2 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
index 16b1888270eb..7f17b9656cc3 100644
--- a/drivers/net/ethernet/renesas/rswitch.c
+++ b/drivers/net/ethernet/renesas/rswitch.c
@@ -111,25 +111,35 @@ static void rswitch_top_init(struct rswitch_private *priv)
 /* Forwarding engine block (MFWD) */
 static void rswitch_fwd_init(struct rswitch_private *priv)
 {
+	u32 all_ports_mask = GENMASK(RSWITCH_NUM_AGENTS - 1, 0);
 	unsigned int i;
 
-	/* For ETHA */
-	for (i = 0; i < RSWITCH_NUM_PORTS; i++) {
-		iowrite32(FWPC0_DEFAULT, priv->addr + FWPC0(i));
+	/* Start with empty configuration */
+	for (i = 0; i < RSWITCH_NUM_AGENTS; i++) {
+		/* Disable all port features */
+		iowrite32(0, priv->addr + FWPC0(i));
+		/* Disallow L3 forwarding and direct descriptor forwarding */
+		iowrite32(FIELD_PREP(FWCP1_LTHFW, all_ports_mask),
+			  priv->addr + FWPC1(i));
+		/* Disallow L2 forwarding */
+		iowrite32(FIELD_PREP(FWCP2_LTWFW, all_ports_mask),
+			  priv->addr + FWPC2(i));
+		/* Disallow port based forwarding */
 		iowrite32(0, priv->addr + FWPBFC(i));
 	}
 
-	for (i = 0; i < RSWITCH_NUM_PORTS; i++) {
+	/* For enabled ETHA ports, setup port based forwarding */
+	rswitch_for_each_enabled_port(priv, i) {
+		/* Port based forwarding from port i to GWCA port */
+		rswitch_modify(priv->addr, FWPBFC(i), FWPBFC_PBDV,
+			       FIELD_PREP(FWPBFC_PBDV, BIT(priv->gwca.index)));
+		/* Within GWCA port, forward to Rx queue for port i */
 		iowrite32(priv->rdev[i]->rx_queue->index,
 			  priv->addr + FWPBFCSDC(GWCA_INDEX, i));
-		iowrite32(BIT(priv->gwca.index), priv->addr + FWPBFC(i));
 	}
 
-	/* For GWCA */
-	iowrite32(FWPC0_DEFAULT, priv->addr + FWPC0(priv->gwca.index));
-	iowrite32(FWPC1_DDE, priv->addr + FWPC1(priv->gwca.index));
-	iowrite32(0, priv->addr + FWPBFC(priv->gwca.index));
-	iowrite32(GENMASK(RSWITCH_NUM_PORTS - 1, 0), priv->addr + FWPBFC(priv->gwca.index));
+	/* For GWCA port, allow direct descriptor forwarding */
+	rswitch_modify(priv->addr, FWPC1(priv->gwca.index), FWPC1_DDE, FWPC1_DDE);
 }
 
 /* Gateway CPU agent block (GWCA) */
diff --git a/drivers/net/ethernet/renesas/rswitch.h b/drivers/net/ethernet/renesas/rswitch.h
index 9ac55b4f5b14..741b089c8523 100644
--- a/drivers/net/ethernet/renesas/rswitch.h
+++ b/drivers/net/ethernet/renesas/rswitch.h
@@ -12,6 +12,7 @@
 
 #define RSWITCH_MAX_NUM_QUEUES	128
 
+#define RSWITCH_NUM_AGENTS	5
 #define RSWITCH_NUM_PORTS	3
 #define rswitch_for_each_enabled_port(priv, i)		\
 	for (i = 0; i < RSWITCH_NUM_PORTS; i++)		\
@@ -811,6 +812,7 @@ enum rswitch_gwca_mode {
 #define CABPPFLC_INIT_VALUE	0x00800080
 
 /* MFWD */
+#define FWPC0(i)		(FWPC00 + (i) * 0x10)
 #define FWPC0_LTHTA		BIT(0)
 #define FWPC0_IP4UE		BIT(3)
 #define FWPC0_IP4TE		BIT(4)
@@ -824,15 +826,15 @@ enum rswitch_gwca_mode {
 #define FWPC0_MACHMA		BIT(27)
 #define FWPC0_VLANSA		BIT(28)
 
-#define FWPC0(i)		(FWPC00 + (i) * 0x10)
-#define FWPC0_DEFAULT		(FWPC0_LTHTA | FWPC0_IP4UE | FWPC0_IP4TE | \
-				 FWPC0_IP4OE | FWPC0_L2SE | FWPC0_IP4EA | \
-				 FWPC0_IPDSA | FWPC0_IPHLA | FWPC0_MACSDA | \
-				 FWPC0_MACHLA |	FWPC0_MACHMA | FWPC0_VLANSA)
 #define FWPC1(i)		(FWPC10 + (i) * 0x10)
+#define FWCP1_LTHFW		GENMASK(16 + (RSWITCH_NUM_AGENTS - 1), 16)
 #define FWPC1_DDE		BIT(0)
 
-#define	FWPBFC(i)		(FWPBFC0 + (i) * 0x10)
+#define FWPC2(i)		(FWPC20 + (i) * 0x10)
+#define FWCP2_LTWFW		GENMASK(16 + (RSWITCH_NUM_AGENTS - 1), 16)
+
+#define FWPBFC(i)		(FWPBFC0 + (i) * 0x10)
+#define FWPBFC_PBDV		GENMASK(RSWITCH_NUM_AGENTS - 1, 0)
 
 #define FWPBFCSDC(j, i)         (FWPBFCSDC00 + (i) * 0x10 + (j) * 0x04)
 
-- 
2.39.5