netdev - [PATCH net-next 08/13] net: enetc: enable RSS feature by default

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Message-Id: <20250103060610.2233908-9-wei.fang@nxp.com>
Date: Fri,  3 Jan 2025 14:06:04 +0800
From: Wei Fang <wei.fang@....com>
To: claudiu.manoil@....com,
	vladimir.oltean@....com,
	xiaoning.wang@....com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	christophe.leroy@...roup.eu
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org,
	imx@...ts.linux.dev
Subject: [PATCH net-next 08/13] net: enetc: enable RSS feature by default

Receive side scaling (RSS) is a network driver technology that enables
the efficient distribution of network receive processing across multiple
CPUs in multiprocessor systems. Therefore, it is better to enable RSS by
default so that the CPU load can be balanced and network performance can
be improved when then network is enabled.

Signed-off-by: Wei Fang <wei.fang@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc.c  | 35 ++++++++++---------
 .../freescale/enetc/enetc_pf_common.c         |  4 ++-
 .../net/ethernet/freescale/enetc/enetc_vf.c   |  4 ++-
 3 files changed, 25 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 233f58e57a20..e27b031c4f46 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -2378,6 +2378,22 @@ static void enetc_set_lso_flags_mask(struct enetc_hw *hw)
 	enetc_wr(hw, ENETC4_SILSOSFMR1, 0);
 }
 
+static int enetc_set_rss(struct net_device *ndev, int en)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+	struct enetc_hw *hw = &priv->si->hw;
+	u32 reg;
+
+	enetc_wr(hw, ENETC_SIRBGCR, priv->num_rx_rings);
+
+	reg = enetc_rd(hw, ENETC_SIMR);
+	reg &= ~ENETC_SIMR_RSSE;
+	reg |= (en) ? ENETC_SIMR_RSSE : 0;
+	enetc_wr(hw, ENETC_SIMR, reg);
+
+	return 0;
+}
+
 int enetc_configure_si(struct enetc_ndev_priv *priv)
 {
 	struct enetc_si *si = priv->si;
@@ -2398,6 +2414,9 @@ int enetc_configure_si(struct enetc_ndev_priv *priv)
 		err = enetc_setup_default_rss_table(si, priv->num_rx_rings);
 		if (err)
 			return err;
+
+		if (priv->ndev->features & NETIF_F_RXHASH)
+			enetc_set_rss(priv->ndev, true);
 	}
 
 	return 0;
@@ -3190,22 +3209,6 @@ struct net_device_stats *enetc_get_stats(struct net_device *ndev)
 }
 EXPORT_SYMBOL_GPL(enetc_get_stats);
 
-static int enetc_set_rss(struct net_device *ndev, int en)
-{
-	struct enetc_ndev_priv *priv = netdev_priv(ndev);
-	struct enetc_hw *hw = &priv->si->hw;
-	u32 reg;
-
-	enetc_wr(hw, ENETC_SIRBGCR, priv->num_rx_rings);
-
-	reg = enetc_rd(hw, ENETC_SIMR);
-	reg &= ~ENETC_SIMR_RSSE;
-	reg |= (en) ? ENETC_SIMR_RSSE : 0;
-	enetc_wr(hw, ENETC_SIMR, reg);
-
-	return 0;
-}
-
 static void enetc_enable_rxvlan(struct net_device *ndev, bool en)
 {
 	struct enetc_ndev_priv *priv = netdev_priv(ndev);
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
index c346e0e3ad37..a737a7f8c79e 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf_common.c
@@ -128,8 +128,10 @@ void enetc_pf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
 	if (si->hw_features & ENETC_SI_F_LSO)
 		priv->active_offloads |= ENETC_F_LSO;
 
-	if (si->num_rss)
+	if (si->num_rss) {
 		ndev->hw_features |= NETIF_F_RXHASH;
+		ndev->features |= NETIF_F_RXHASH;
+	}
 
 	/* TODO: currently, i.MX95 ENETC driver does not support advanced features */
 	if (!is_enetc_rev1(si)) {
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_vf.c b/drivers/net/ethernet/freescale/enetc/enetc_vf.c
index 072e5b40a199..3372a9a779a6 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_vf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_vf.c
@@ -155,8 +155,10 @@ static void enetc_vf_netdev_setup(struct enetc_si *si, struct net_device *ndev,
 	ndev->vlan_features = NETIF_F_SG | NETIF_F_HW_CSUM |
 			      NETIF_F_TSO | NETIF_F_TSO6;
 
-	if (si->num_rss)
+	if (si->num_rss) {
 		ndev->hw_features |= NETIF_F_RXHASH;
+		ndev->features |= NETIF_F_RXHASH;
+	}
 
 	/* pick up primary MAC address from SI */
 	enetc_load_primary_mac_addr(&si->hw, ndev);
-- 
2.34.1