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Subject[Patch net-next v14 09/13] net: dsa: microchip: lan937x: add MTU and fast_age support
Date
This patch add the support for port_max_mtu, port_change_mtu and
port_fast_age dsa functionality.

Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
---
drivers/net/dsa/microchip/ksz_common.c | 2 ++
drivers/net/dsa/microchip/lan937x.h | 1 +
drivers/net/dsa/microchip/lan937x_main.c | 28 ++++++++++++++++++++++++
drivers/net/dsa/microchip/lan937x_reg.h | 5 +++++
4 files changed, 36 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 67bb4bff4d9b..fb0de48a3f5e 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -206,6 +206,7 @@ static const struct ksz_dev_ops lan937x_dev_ops = {
.setup = lan937x_setup,
.get_port_addr = ksz9477_get_port_addr,
.cfg_port_member = ksz9477_cfg_port_member,
+ .flush_dyn_mac_table = ksz9477_flush_dyn_mac_table,
.port_setup = lan937x_port_setup,
.r_phy = lan937x_r_phy,
.w_phy = lan937x_w_phy,
@@ -224,6 +225,7 @@ static const struct ksz_dev_ops lan937x_dev_ops = {
.fdb_del = ksz9477_fdb_del,
.mdb_add = ksz9477_mdb_add,
.mdb_del = ksz9477_mdb_del,
+ .change_mtu = lan937x_change_mtu,
.max_mtu = ksz9477_max_mtu,
.config_cpu_port = lan937x_config_cpu_port,
.enable_stp_addr = ksz9477_enable_stp_addr,
diff --git a/drivers/net/dsa/microchip/lan937x.h b/drivers/net/dsa/microchip/lan937x.h
index 370203406a05..50563874600d 100644
--- a/drivers/net/dsa/microchip/lan937x.h
+++ b/drivers/net/dsa/microchip/lan937x.h
@@ -14,4 +14,5 @@ int lan937x_switch_init(struct ksz_device *dev);
void lan937x_switch_exit(struct ksz_device *dev);
void lan937x_r_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 *data);
void lan937x_w_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 val);
+int lan937x_change_mtu(struct ksz_device *dev, int port, int new_mtu);
#endif
diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
index 7090947cf52c..5917cc11ba59 100644
--- a/drivers/net/dsa/microchip/lan937x_main.c
+++ b/drivers/net/dsa/microchip/lan937x_main.c
@@ -9,6 +9,7 @@
#include <linux/of_net.h>
#include <linux/of_mdio.h>
#include <linux/if_bridge.h>
+#include <linux/if_vlan.h>
#include <linux/math.h>
#include <net/dsa.h>
#include <net/switchdev.h>
@@ -284,6 +285,33 @@ void lan937x_config_cpu_port(struct dsa_switch *ds)
}
}

+int lan937x_change_mtu(struct ksz_device *dev, int port, int new_mtu)
+{
+ struct dsa_switch *ds = dev->ds;
+ int ret;
+
+ new_mtu += VLAN_ETH_HLEN + ETH_FCS_LEN;
+
+ if (dsa_is_cpu_port(ds, port))
+ new_mtu += LAN937X_TAG_LEN;
+
+ if (new_mtu >= FR_MIN_SIZE)
+ ret = lan937x_port_cfg(dev, port, REG_PORT_MAC_CTRL_0,
+ PORT_JUMBO_PACKET, true);
+ else
+ ret = lan937x_port_cfg(dev, port, REG_PORT_MAC_CTRL_0,
+ PORT_JUMBO_PACKET, false);
+ if (ret < 0) {
+ dev_err(ds->dev, "failed to enable jumbo\n");
+ return ret;
+ }
+
+ /* Write the frame size in PORT_MAX_FR_SIZE register */
+ ksz_pwrite16(dev, port, PORT_MAX_FR_SIZE, new_mtu);
+
+ return 0;
+}
+
int lan937x_setup(struct dsa_switch *ds)
{
struct ksz_device *dev = ds->priv;
diff --git a/drivers/net/dsa/microchip/lan937x_reg.h b/drivers/net/dsa/microchip/lan937x_reg.h
index 7a0fa2595950..19f3aa344228 100644
--- a/drivers/net/dsa/microchip/lan937x_reg.h
+++ b/drivers/net/dsa/microchip/lan937x_reg.h
@@ -149,6 +149,9 @@
#define PORT_BACK_PRESSURE BIT(3)
#define PORT_PASS_ALL BIT(0)

+#define PORT_MAX_FR_SIZE 0x404
+#define FR_MIN_SIZE 1522
+
/* 8 - Classification and Policing */
#define REG_PORT_MRI_PRIO_CTRL 0x0801
#define PORT_HIGHEST_PRIO BIT(7)
@@ -161,4 +164,6 @@

#define P_PRIO_CTRL REG_PORT_MRI_PRIO_CTRL

+#define LAN937X_TAG_LEN 2
+
#endif
--
2.36.1
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