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80 lines
2.8 KiB
Diff
80 lines
2.8 KiB
Diff
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From 69fd055957a02309ffdc23d887a01988b6e5bab1 Mon Sep 17 00:00:00 2001
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From: Ansuel Smith <ansuelsmth@gmail.com>
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Date: Sat, 16 Apr 2022 01:30:12 +0200
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Subject: [PATCH 1/6] net: dsa: qca8k: drop MTU tracking from qca8k_priv
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DSA set the CPU port based on the largest MTU of all the slave ports.
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Based on this we can drop the MTU array from qca8k_priv and set the
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port_change_mtu logic on DSA changing MTU of the CPU port as the switch
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have a global MTU settingfor each port.
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Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/dsa/qca8k.c | 26 +++++++++-----------------
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drivers/net/dsa/qca8k.h | 1 -
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2 files changed, 9 insertions(+), 18 deletions(-)
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--- a/drivers/net/dsa/qca8k.c
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+++ b/drivers/net/dsa/qca8k.c
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@@ -1803,16 +1803,6 @@ qca8k_setup(struct dsa_switch *ds)
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QCA8K_PORT_HOL_CTRL1_WRED_EN,
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mask);
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}
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-
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- /* Set initial MTU for every port.
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- * We have only have a general MTU setting. So track
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- * every port and set the max across all port.
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- * Set per port MTU to 1500 as the MTU change function
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- * will add the overhead and if its set to 1518 then it
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- * will apply the overhead again and we will end up with
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- * MTU of 1536 instead of 1518
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- */
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- priv->port_mtu[i] = ETH_DATA_LEN;
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}
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/* Special GLOBAL_FC_THRESH value are needed for ar8327 switch */
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@@ -2525,13 +2515,16 @@ static int
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qca8k_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu)
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{
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struct qca8k_priv *priv = ds->priv;
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- int ret, i, mtu = 0;
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-
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- priv->port_mtu[port] = new_mtu;
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+ int ret;
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- for (i = 0; i < QCA8K_NUM_PORTS; i++)
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- if (priv->port_mtu[i] > mtu)
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- mtu = priv->port_mtu[i];
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+ /* We have only have a general MTU setting.
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+ * DSA always set the CPU port's MTU to the largest MTU of the slave
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+ * ports.
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+ * Setting MTU just for the CPU port is sufficient to correctly set a
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+ * value for every port.
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+ */
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+ if (!dsa_is_cpu_port(ds, port))
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+ return 0;
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/* To change the MAX_FRAME_SIZE the cpu ports must be off or
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* the switch panics.
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@@ -2545,7 +2538,7 @@ qca8k_port_change_mtu(struct dsa_switch
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qca8k_port_set_status(priv, 6, 0);
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/* Include L2 header / FCS length */
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- ret = qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, mtu + ETH_HLEN + ETH_FCS_LEN);
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+ ret = qca8k_write(priv, QCA8K_MAX_FRAME_SIZE, new_mtu + ETH_HLEN + ETH_FCS_LEN);
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if (priv->port_sts[0].enabled)
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qca8k_port_set_status(priv, 0, 1);
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--- a/drivers/net/dsa/qca8k.h
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+++ b/drivers/net/dsa/qca8k.h
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@@ -392,7 +392,6 @@ struct qca8k_priv {
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struct device *dev;
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struct dsa_switch_ops ops;
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struct gpio_desc *reset_gpio;
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- unsigned int port_mtu[QCA8K_NUM_PORTS];
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struct net_device *mgmt_master; /* Track if mdio/mib Ethernet is available */
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struct qca8k_mgmt_eth_data mgmt_eth_data;
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struct qca8k_mib_eth_data mib_eth_data;
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