linux-kernel - [PATCH net-next v3 2/2] net: ethernet: ti: am65-cpsw: enable DSCP to priority map for RX

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Message-Id: <20241109-am65-cpsw-multi-rx-dscp-v3-2-1cfb76928490@kernel.org>
Date: Sat, 09 Nov 2024 13:00:08 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Siddharth Vadapalli <s-vadapalli@...com>, 
 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>, 
 Simon Horman <horms@...nel.org>
Cc: linux-omap@...r.kernel.org, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, srk@...com, Pekka Varis <p-varis@...com>, 
 Roger Quadros <rogerq@...nel.org>
Subject: [PATCH net-next v3 2/2] net: ethernet: ti: am65-cpsw: enable DSCP
 to priority map for RX

AM65 CPSW hardware can map the 6-bit DSCP/TOS field to
appropriate priority queue via DSCP to Priority mapping registers
(CPSW_PN_RX_PRI_MAP_REG).

We use the upper 3 bits of the DSCP field that indicate IP Precedence
to map traffic to 8 priority queues.

Signed-off-by: Roger Quadros <rogerq@...nel.org>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 54 ++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 0520e9f4bea7..fab35e6aac7f 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -71,6 +71,8 @@
 #define AM65_CPSW_PORT_REG_RX_PRI_MAP		0x020
 #define AM65_CPSW_PORT_REG_RX_MAXLEN		0x024
 
+#define AM65_CPSW_PORTN_REG_CTL			0x004
+#define AM65_CPSW_PORTN_REG_DSCP_MAP		0x120
 #define AM65_CPSW_PORTN_REG_SA_L		0x308
 #define AM65_CPSW_PORTN_REG_SA_H		0x30c
 #define AM65_CPSW_PORTN_REG_TS_CTL              0x310
@@ -94,6 +96,10 @@
 /* AM65_CPSW_PORT_REG_PRI_CTL */
 #define AM65_CPSW_PORT_REG_PRI_CTL_RX_PTYPE_RROBIN	BIT(8)
 
+/* AM65_CPSW_PN_REG_CTL */
+#define AM65_CPSW_PN_REG_CTL_DSCP_IPV4_EN	BIT(1)
+#define AM65_CPSW_PN_REG_CTL_DSCP_IPV6_EN	BIT(2)
+
 /* AM65_CPSW_PN_TS_CTL register fields */
 #define AM65_CPSW_PN_TS_CTL_TX_ANX_F_EN		BIT(4)
 #define AM65_CPSW_PN_TS_CTL_TX_VLAN_LT1_EN	BIT(5)
@@ -176,6 +182,53 @@ static void am65_cpsw_port_set_sl_mac(struct am65_cpsw_port *slave,
 	writel(mac_lo, slave->port_base + AM65_CPSW_PORTN_REG_SA_L);
 }
 
+#define AM65_CPSW_DSCP_MAX	GENMASK(5, 0)
+#define AM65_CPSW_PRI_MAX	GENMASK(2, 0)
+#define AM65_CPSW_DSCP_PRI_PER_REG	8
+#define AM65_CPSW_DSCP_PRI_SIZE		4	/* in bits */
+static int am65_cpsw_port_set_dscp_map(struct am65_cpsw_port *slave, u8 dscp, u8 pri)
+{
+	int reg_ofs;
+	int bit_ofs;
+	u32 val;
+
+	if (dscp > AM65_CPSW_DSCP_MAX)
+		return -EINVAL;
+
+	if (pri > AM65_CPSW_PRI_MAX)
+		return -EINVAL;
+
+	/* 32-bit register offset to this dscp */
+	reg_ofs = (dscp / AM65_CPSW_DSCP_PRI_PER_REG) * 4;
+	/* bit field offset to this dscp */
+	bit_ofs = AM65_CPSW_DSCP_PRI_SIZE * (dscp % AM65_CPSW_DSCP_PRI_PER_REG);
+
+	val = readl(slave->port_base + AM65_CPSW_PORTN_REG_DSCP_MAP + reg_ofs);
+	val &= ~(AM65_CPSW_PRI_MAX << bit_ofs);	/* clear */
+	val |= pri << bit_ofs;			/* set */
+	writel(val, slave->port_base + AM65_CPSW_PORTN_REG_DSCP_MAP + reg_ofs);
+
+	return 0;
+}
+
+static void am65_cpsw_port_enable_dscp_map(struct am65_cpsw_port *slave)
+{
+	int dscp, pri;
+	u32 val;
+
+	/* Map IP Precedence field to Priority */
+	for (dscp = 0; dscp <= AM65_CPSW_DSCP_MAX; dscp++) {
+		pri = dscp >> 3; /* Extract IP Precedence */
+		am65_cpsw_port_set_dscp_map(slave, dscp, pri);
+	}
+
+	/* enable port IPV4 and IPV6 DSCP for this port */
+	val = readl(slave->port_base + AM65_CPSW_PORTN_REG_CTL);
+	val |= AM65_CPSW_PN_REG_CTL_DSCP_IPV4_EN |
+		AM65_CPSW_PN_REG_CTL_DSCP_IPV6_EN;
+	writel(val, slave->port_base + AM65_CPSW_PORTN_REG_CTL);
+}
+
 static void am65_cpsw_sl_ctl_reset(struct am65_cpsw_port *port)
 {
 	cpsw_sl_reset(port->slave.mac_sl, 100);
@@ -921,6 +974,7 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
 	common->usage_count++;
 
 	am65_cpsw_port_set_sl_mac(port, ndev->dev_addr);
+	am65_cpsw_port_enable_dscp_map(port);
 
 	if (common->is_emac_mode)
 		am65_cpsw_init_port_emac_ale(port);

-- 
2.34.1