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From:   Christian Marangi <ansuelsmth@gmail.com>
To:     Andrew Lunn <andrew@lunn.ch>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Vladimir Oltean <olteanv@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Tom Rix <trix@redhat.com>, Jens Axboe <axboe@kernel.dk>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Christian Marangi <ansuelsmth@gmail.com>,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
        llvm@lists.linux.dev
Subject: [net-next PATCH v4 01/14] net: dsa: qca8k: cache match data to speed up access
Date:   Sun, 24 Jul 2022 22:19:25 +0200
Message-Id: <20220724201938.17387-2-ansuelsmth@gmail.com>
In-Reply-To: <20220724201938.17387-1-ansuelsmth@gmail.com>
References: <20220724201938.17387-1-ansuelsmth@gmail.com>
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Using of_device_get_match_data is expensive. Cache match data to speed
up access and rework user of match data to use the new cached value.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 drivers/net/dsa/qca/qca8k.c | 28 ++++++++++------------------
 drivers/net/dsa/qca/qca8k.h |  1 +
 2 files changed, 11 insertions(+), 18 deletions(-)

diff --git a/drivers/net/dsa/qca/qca8k.c b/drivers/net/dsa/qca/qca8k.c
index 1cbb05b0323f..212b284f9f73 100644
--- a/drivers/net/dsa/qca/qca8k.c
+++ b/drivers/net/dsa/qca/qca8k.c
@@ -1462,8 +1462,8 @@ static int qca8k_find_cpu_port(struct dsa_switch *ds)
 static int
 qca8k_setup_of_pws_reg(struct qca8k_priv *priv)
 {
+	const struct qca8k_match_data *data = priv->info;
 	struct device_node *node = priv->dev->of_node;
-	const struct qca8k_match_data *data;
 	u32 val = 0;
 	int ret;
 
@@ -1472,8 +1472,6 @@ qca8k_setup_of_pws_reg(struct qca8k_priv *priv)
 	 * Should be applied by default but we set this just to make sure.
 	 */
 	if (priv->switch_id == QCA8K_ID_QCA8327) {
-		data = of_device_get_match_data(priv->dev);
-
 		/* Set the correct package of 148 pin for QCA8327 */
 		if (data->reduced_package)
 			val |= QCA8327_PWS_PACKAGE148_EN;
@@ -1996,23 +1994,19 @@ static void qca8k_setup_pcs(struct qca8k_priv *priv, struct qca8k_pcs *qpcs,
 static void
 qca8k_get_strings(struct dsa_switch *ds, int port, u32 stringset, uint8_t *data)
 {
-	const struct qca8k_match_data *match_data;
 	struct qca8k_priv *priv = ds->priv;
 	int i;
 
 	if (stringset != ETH_SS_STATS)
 		return;
 
-	match_data = of_device_get_match_data(priv->dev);
-
-	for (i = 0; i < match_data->mib_count; i++)
+	for (i = 0; i < priv->info->mib_count; i++)
 		strncpy(data + i * ETH_GSTRING_LEN, ar8327_mib[i].name,
 			ETH_GSTRING_LEN);
 }
 
 static void qca8k_mib_autocast_handler(struct dsa_switch *ds, struct sk_buff *skb)
 {
-	const struct qca8k_match_data *match_data;
 	struct qca8k_mib_eth_data *mib_eth_data;
 	struct qca8k_priv *priv = ds->priv;
 	const struct qca8k_mib_desc *mib;
@@ -2031,10 +2025,9 @@ static void qca8k_mib_autocast_handler(struct dsa_switch *ds, struct sk_buff *sk
 	if (port != mib_eth_data->req_port)
 		goto exit;
 
-	match_data = device_get_match_data(priv->dev);
 	data = mib_eth_data->data;
 
-	for (i = 0; i < match_data->mib_count; i++) {
+	for (i = 0; i < priv->info->mib_count; i++) {
 		mib = &ar8327_mib[i];
 
 		/* First 3 mib are present in the skb head */
@@ -2106,7 +2099,6 @@ qca8k_get_ethtool_stats(struct dsa_switch *ds, int port,
 			uint64_t *data)
 {
 	struct qca8k_priv *priv = (struct qca8k_priv *)ds->priv;
-	const struct qca8k_match_data *match_data;
 	const struct qca8k_mib_desc *mib;
 	u32 reg, i, val;
 	u32 hi = 0;
@@ -2116,9 +2108,7 @@ qca8k_get_ethtool_stats(struct dsa_switch *ds, int port,
 	    qca8k_get_ethtool_stats_eth(ds, port, data) > 0)
 		return;
 
-	match_data = of_device_get_match_data(priv->dev);
-
-	for (i = 0; i < match_data->mib_count; i++) {
+	for (i = 0; i < priv->info->mib_count; i++) {
 		mib = &ar8327_mib[i];
 		reg = QCA8K_PORT_MIB_COUNTER(port) + mib->offset;
 
@@ -2141,15 +2131,12 @@ qca8k_get_ethtool_stats(struct dsa_switch *ds, int port,
 static int
 qca8k_get_sset_count(struct dsa_switch *ds, int port, int sset)
 {
-	const struct qca8k_match_data *match_data;
 	struct qca8k_priv *priv = ds->priv;
 
 	if (sset != ETH_SS_STATS)
 		return 0;
 
-	match_data = of_device_get_match_data(priv->dev);
-
-	return match_data->mib_count;
+	return priv->info->mib_count;
 }
 
 static int
@@ -3168,6 +3155,11 @@ qca8k_sw_probe(struct mdio_device *mdiodev)
 	if (ret)
 		return ret;
 
+	/* Cache match data in priv struct.
+	 * Match data is already checked in read_switch_id.
+	 */
+	priv->info = of_device_get_match_data(priv->dev);
+
 	priv->ds = devm_kzalloc(&mdiodev->dev, sizeof(*priv->ds), GFP_KERNEL);
 	if (!priv->ds)
 		return -ENOMEM;
diff --git a/drivers/net/dsa/qca/qca8k.h b/drivers/net/dsa/qca/qca8k.h
index ec58d0e80a70..0b990b46890a 100644
--- a/drivers/net/dsa/qca/qca8k.h
+++ b/drivers/net/dsa/qca/qca8k.h
@@ -401,6 +401,7 @@ struct qca8k_priv {
 	struct qca8k_mdio_cache mdio_cache;
 	struct qca8k_pcs pcs_port_0;
 	struct qca8k_pcs pcs_port_6;
+	const struct qca8k_match_data *info;
 };
 
 struct qca8k_mib_desc {
-- 
2.36.1