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Date: Mon, 9 May 2022 00:48:47 +0200
From: Hauke Mehrtens <hauke@...ke-m.de>
To: davem@...emloft.net, kuba@...nel.org
Cc: linus.walleij@...aro.org, alsi@...g-olufsen.dk, andrew@...n.ch,
vivien.didelot@...il.com, f.fainelli@...il.com, olteanv@...il.com,
netdev@...r.kernel.org, Hauke Mehrtens <hauke@...ke-m.de>
Subject: [PATCH 3/4] net: dsa: realtek: rtl8365mb: Add setting MTU
The switch does not support per port MTU setting, but only a MRU
setting. Implement this by setting the MTU on the CPU port.
Without this patch the MRU was always set to 1536, not it is set by the
DSA subsystem and the user scan change it.
Signed-off-by: Hauke Mehrtens <hauke@...ke-m.de>
---
drivers/net/dsa/realtek/rtl8365mb.c | 43 ++++++++++++++++++++++++-----
1 file changed, 36 insertions(+), 7 deletions(-)
diff --git a/drivers/net/dsa/realtek/rtl8365mb.c b/drivers/net/dsa/realtek/rtl8365mb.c
index be64cfdeccc7..f9b690251155 100644
--- a/drivers/net/dsa/realtek/rtl8365mb.c
+++ b/drivers/net/dsa/realtek/rtl8365mb.c
@@ -1132,6 +1132,38 @@ static int rtl8365mb_port_set_isolation(struct realtek_priv *priv, int port,
return regmap_write(priv->map, RTL8365MB_PORT_ISOLATION_REG(port), mask);
}
+static int rtl8365mb_port_change_mtu(struct dsa_switch *ds, int port,
+ int new_mtu)
+{
+ struct dsa_port *dp = dsa_to_port(ds, port);
+ struct realtek_priv *priv = ds->priv;
+ int length;
+
+ /* When a new MTU is set, DSA always set the CPU port's MTU to the
+ * largest MTU of the slave ports. Because the switch only has a global
+ * RX length register, only allowing CPU port here is enough.
+ */
+ if (!dsa_is_cpu_port(ds, port))
+ return 0;
+
+ length = new_mtu + ETH_HLEN + ETH_FCS_LEN;
+ length += dp->tag_ops->needed_headroom;
+ length += dp->tag_ops->needed_tailroom;
+
+ if (length > RTL8365MB_CFG0_MAX_LEN_MASK)
+ return -EINVAL;
+
+ return regmap_update_bits(priv->map, RTL8365MB_CFG0_MAX_LEN_REG,
+ RTL8365MB_CFG0_MAX_LEN_MASK,
+ FIELD_PREP(RTL8365MB_CFG0_MAX_LEN_MASK,
+ length));
+}
+
+static int rtl8365mb_port_max_mtu(struct dsa_switch *ds, int port)
+{
+ return RTL8365MB_CFG0_MAX_LEN_MASK - ETH_HLEN - ETH_FCS_LEN - 8;
+}
+
static int rtl8365mb_mib_counter_read(struct realtek_priv *priv, int port,
u32 offset, u32 length, u64 *mibvalue)
{
@@ -1928,13 +1960,6 @@ static int rtl8365mb_setup(struct dsa_switch *ds)
p->index = i;
}
- /* Set maximum packet length to 1536 bytes */
- ret = regmap_update_bits(priv->map, RTL8365MB_CFG0_MAX_LEN_REG,
- RTL8365MB_CFG0_MAX_LEN_MASK,
- FIELD_PREP(RTL8365MB_CFG0_MAX_LEN_MASK, 1536));
- if (ret)
- goto out_teardown_irq;
-
if (priv->setup_interface) {
ret = priv->setup_interface(ds);
if (ret) {
@@ -2080,6 +2105,8 @@ static const struct dsa_switch_ops rtl8365mb_switch_ops_smi = {
.phylink_mac_link_down = rtl8365mb_phylink_mac_link_down,
.phylink_mac_link_up = rtl8365mb_phylink_mac_link_up,
.port_stp_state_set = rtl8365mb_port_stp_state_set,
+ .port_change_mtu = rtl8365mb_port_change_mtu,
+ .port_max_mtu = rtl8365mb_port_max_mtu,
.get_strings = rtl8365mb_get_strings,
.get_ethtool_stats = rtl8365mb_get_ethtool_stats,
.get_sset_count = rtl8365mb_get_sset_count,
@@ -2101,6 +2128,8 @@ static const struct dsa_switch_ops rtl8365mb_switch_ops_mdio = {
.phy_read = rtl8365mb_dsa_phy_read,
.phy_write = rtl8365mb_dsa_phy_write,
.port_stp_state_set = rtl8365mb_port_stp_state_set,
+ .port_change_mtu = rtl8365mb_port_change_mtu,
+ .port_max_mtu = rtl8365mb_port_max_mtu,
.get_strings = rtl8365mb_get_strings,
.get_ethtool_stats = rtl8365mb_get_ethtool_stats,
.get_sset_count = rtl8365mb_get_sset_count,
--
2.30.2
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