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Subject[PATCH net-next v5 6/9] net: lan966x: Add support to offload the forwarding.
Date
This patch adds basic support to offload in the HW the forwarding of the
frames. The driver registers to the switchdev callbacks and implements
the callbacks for attributes SWITCHDEV_ATTR_ID_PORT_STP_STATE and
SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME.
It is not allowed to add a lan966x port to a bridge that contains a
different interface than lan966x.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
.../net/ethernet/microchip/lan966x/Kconfig | 1 +
.../net/ethernet/microchip/lan966x/Makefile | 2 +-
.../ethernet/microchip/lan966x/lan966x_main.c | 16 +-
.../ethernet/microchip/lan966x/lan966x_main.h | 11 +
.../microchip/lan966x/lan966x_switchdev.c | 393 ++++++++++++++++++
5 files changed, 419 insertions(+), 4 deletions(-)
create mode 100644 drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c

diff --git a/drivers/net/ethernet/microchip/lan966x/Kconfig b/drivers/net/ethernet/microchip/lan966x/Kconfig
index 2860a8c9923d..ac273f84b69e 100644
--- a/drivers/net/ethernet/microchip/lan966x/Kconfig
+++ b/drivers/net/ethernet/microchip/lan966x/Kconfig
@@ -2,6 +2,7 @@ config LAN966X_SWITCH
tristate "Lan966x switch driver"
depends on HAS_IOMEM
depends on OF
+ depends on NET_SWITCHDEV
select PHYLINK
select PACKING
help
diff --git a/drivers/net/ethernet/microchip/lan966x/Makefile b/drivers/net/ethernet/microchip/lan966x/Makefile
index 2989ba528236..974229c51f55 100644
--- a/drivers/net/ethernet/microchip/lan966x/Makefile
+++ b/drivers/net/ethernet/microchip/lan966x/Makefile
@@ -6,4 +6,4 @@
obj-$(CONFIG_LAN966X_SWITCH) += lan966x-switch.o

lan966x-switch-objs := lan966x_main.o lan966x_phylink.o lan966x_port.o \
- lan966x_mac.o lan966x_ethtool.o
+ lan966x_mac.o lan966x_ethtool.o lan966x_switchdev.o
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
index dc40ac2eb246..ee453967da71 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
@@ -355,6 +355,11 @@ static const struct net_device_ops lan966x_port_netdev_ops = {
.ndo_get_port_parent_id = lan966x_port_get_parent_id,
};

+bool lan966x_netdevice_check(const struct net_device *dev)
+{
+ return dev->netdev_ops == &lan966x_port_netdev_ops;
+}
+
static int lan966x_port_xtr_status(struct lan966x *lan966x, u8 grp)
{
return lan_rd(lan966x, QS_XTR_RD(grp));
@@ -491,6 +496,9 @@ static irqreturn_t lan966x_xtr_irq_handler(int irq, void *args)

skb->protocol = eth_type_trans(skb, dev);

+ if (lan966x->bridge_mask & BIT(src_port))
+ skb->offload_fwd_mark = 1;
+
netif_rx_ni(skb);
dev->stats.rx_bytes += len;
dev->stats.rx_packets++;
@@ -578,9 +586,6 @@ static int lan966x_probe_port(struct lan966x *lan966x, u32 p,

eth_hw_addr_gen(dev, lan966x->base_mac, p + 1);

- lan966x_mac_learn(lan966x, PGID_CPU, dev->dev_addr, port->pvid,
- ENTRYTYPE_LOCKED);
-
port->phylink_config.dev = &port->dev->dev;
port->phylink_config.type = PHYLINK_NETDEV;
port->phylink_pcs.poll = true;
@@ -897,6 +902,8 @@ static int lan966x_probe(struct platform_device *pdev)
lan966x_port_init(lan966x->ports[p]);
}

+ lan966x_register_notifier_blocks(lan966x);
+
return 0;

cleanup_ports:
@@ -915,6 +922,8 @@ static int lan966x_remove(struct platform_device *pdev)
{
struct lan966x *lan966x = platform_get_drvdata(pdev);

+ lan966x_unregister_notifier_blocks(lan966x);
+
lan966x_cleanup_ports(lan966x);

cancel_delayed_work_sync(&lan966x->stats_work);
@@ -922,6 +931,7 @@ static int lan966x_remove(struct platform_device *pdev)
mutex_destroy(&lan966x->stats_lock);

lan966x_mac_purge_entries(lan966x);
+ lan966x_ext_purge_entries();

return 0;
}
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
index fcd5d09a070c..3d228c9c0521 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.h
@@ -75,6 +75,10 @@ struct lan966x {

u8 base_mac[ETH_ALEN];

+ struct net_device *bridge;
+ u16 bridge_mask;
+ u16 bridge_fwd_mask;
+
struct list_head mac_entries;
spinlock_t mac_lock; /* lock for mac_entries list */

@@ -122,6 +126,11 @@ extern const struct phylink_mac_ops lan966x_phylink_mac_ops;
extern const struct phylink_pcs_ops lan966x_phylink_pcs_ops;
extern const struct ethtool_ops lan966x_ethtool_ops;

+bool lan966x_netdevice_check(const struct net_device *dev);
+
+void lan966x_register_notifier_blocks(struct lan966x *lan966x);
+void lan966x_unregister_notifier_blocks(struct lan966x *lan966x);
+
void lan966x_stats_get(struct net_device *dev,
struct rtnl_link_stats64 *stats);
int lan966x_stats_init(struct lan966x *lan966x);
@@ -157,6 +166,8 @@ int lan966x_mac_add_entry(struct lan966x *lan966x,
void lan966x_mac_purge_entries(struct lan966x *lan966x);
irqreturn_t lan966x_mac_irq_handler(struct lan966x *lan966x);

+void lan966x_ext_purge_entries(void);
+
static inline void __iomem *lan_addr(void __iomem *base[],
int id, int tinst, int tcnt,
int gbase, int ginst,
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
new file mode 100644
index 000000000000..722ce7cb61b3
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c
@@ -0,0 +1,393 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/if_bridge.h>
+#include <net/switchdev.h>
+
+#include "lan966x_main.h"
+
+static struct notifier_block lan966x_netdevice_nb __read_mostly;
+static struct notifier_block lan966x_switchdev_nb __read_mostly;
+static struct notifier_block lan966x_switchdev_blocking_nb __read_mostly;
+
+static LIST_HEAD(ext_entries);
+
+struct lan966x_ext_entry {
+ struct list_head list;
+ struct net_device *dev;
+ u32 ports;
+ struct lan966x *lan966x;
+};
+
+static void lan966x_update_fwd_mask(struct lan966x *lan966x)
+{
+ int i;
+
+ for (i = 0; i < lan966x->num_phys_ports; i++) {
+ struct lan966x_port *port = lan966x->ports[i];
+ unsigned long mask = 0;
+
+ if (port && lan966x->bridge_fwd_mask & BIT(i))
+ mask = lan966x->bridge_fwd_mask & ~BIT(i);
+
+ mask |= BIT(CPU_PORT);
+
+ lan_wr(ANA_PGID_PGID_SET(mask),
+ lan966x, ANA_PGID(PGID_SRC + i));
+ }
+}
+
+static void lan966x_port_stp_state_set(struct lan966x_port *port, u8 state)
+{
+ struct lan966x *lan966x = port->lan966x;
+ bool learn_ena = false;
+
+ if (state == BR_STATE_FORWARDING || state == BR_STATE_LEARNING)
+ learn_ena = true;
+
+ if (state == BR_STATE_FORWARDING)
+ lan966x->bridge_fwd_mask |= BIT(port->chip_port);
+ else
+ lan966x->bridge_fwd_mask &= ~BIT(port->chip_port);
+
+ lan_rmw(ANA_PORT_CFG_LEARN_ENA_SET(learn_ena),
+ ANA_PORT_CFG_LEARN_ENA,
+ lan966x, ANA_PORT_CFG(port->chip_port));
+
+ lan966x_update_fwd_mask(lan966x);
+}
+
+static void lan966x_port_ageing_set(struct lan966x_port *port,
+ unsigned long ageing_clock_t)
+{
+ unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock_t);
+ u32 ageing_time = jiffies_to_msecs(ageing_jiffies) / 1000;
+
+ lan966x_mac_set_ageing(port->lan966x, ageing_time);
+}
+
+static int lan966x_port_attr_set(struct net_device *dev, const void *ctx,
+ const struct switchdev_attr *attr,
+ struct netlink_ext_ack *extack)
+{
+ struct lan966x_port *port = netdev_priv(dev);
+ int err = 0;
+
+ if (ctx && ctx != port)
+ return 0;
+
+ switch (attr->id) {
+ case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
+ lan966x_port_stp_state_set(port, attr->u.stp_state);
+ break;
+ case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
+ lan966x_port_ageing_set(port, attr->u.ageing_time);
+ break;
+ default:
+ err = -EOPNOTSUPP;
+ break;
+ }
+
+ return err;
+}
+
+static int lan966x_port_bridge_join(struct lan966x_port *port,
+ struct net_device *bridge,
+ struct netlink_ext_ack *extack)
+{
+ struct lan966x *lan966x = port->lan966x;
+ struct net_device *dev = port->dev;
+ int err;
+
+ if (!lan966x->bridge_mask) {
+ lan966x->bridge = bridge;
+ } else {
+ if (lan966x->bridge != bridge)
+ return -ENODEV;
+ }
+
+ err = switchdev_bridge_port_offload(dev, dev, port,
+ &lan966x_switchdev_nb,
+ &lan966x_switchdev_blocking_nb,
+ false, extack);
+ if (err)
+ return err;
+
+ lan966x->bridge_mask |= BIT(port->chip_port);
+
+ return 0;
+}
+
+static void lan966x_port_bridge_leave(struct lan966x_port *port,
+ struct net_device *bridge)
+{
+ struct lan966x *lan966x = port->lan966x;
+
+ lan966x->bridge_mask &= ~BIT(port->chip_port);
+
+ if (!lan966x->bridge_mask)
+ lan966x->bridge = NULL;
+
+ lan966x_mac_cpu_learn(lan966x, port->dev->dev_addr, PORT_PVID);
+}
+
+static int lan966x_port_changeupper(struct net_device *dev,
+ struct netdev_notifier_changeupper_info *info)
+{
+ struct lan966x_port *port = netdev_priv(dev);
+ struct netlink_ext_ack *extack;
+ int err = 0;
+
+ extack = netdev_notifier_info_to_extack(&info->info);
+
+ if (netif_is_bridge_master(info->upper_dev)) {
+ if (info->linking)
+ err = lan966x_port_bridge_join(port, info->upper_dev,
+ extack);
+ else
+ lan966x_port_bridge_leave(port, info->upper_dev);
+ }
+
+ return err;
+}
+
+static int lan966x_port_prechangeupper(struct net_device *dev,
+ struct netdev_notifier_changeupper_info *info)
+{
+ struct lan966x_port *port = netdev_priv(dev);
+
+ if (netif_is_bridge_master(info->upper_dev) && !info->linking)
+ switchdev_bridge_port_unoffload(port->dev, port,
+ &lan966x_switchdev_nb,
+ &lan966x_switchdev_blocking_nb);
+
+ return NOTIFY_DONE;
+}
+
+static int lan966x_port_add_addr(struct net_device *dev, bool up)
+{
+ struct lan966x_port *port = netdev_priv(dev);
+ struct lan966x *lan966x = port->lan966x;
+ u16 vid;
+
+ vid = port->pvid;
+
+ if (up)
+ lan966x_mac_cpu_learn(lan966x, dev->dev_addr, vid);
+ else
+ lan966x_mac_cpu_forget(lan966x, dev->dev_addr, vid);
+
+ return 0;
+}
+
+static struct lan966x_ext_entry *lan966x_ext_find_entry(struct net_device *dev)
+{
+ struct lan966x_ext_entry *ext_entry;
+
+ list_for_each_entry(ext_entry, &ext_entries, list) {
+ if (ext_entry->dev == dev)
+ return ext_entry;
+ }
+
+ return NULL;
+}
+
+static bool lan966x_ext_add_entry(struct net_device *dev, void *lan966x)
+{
+ struct lan966x_ext_entry *ext_entry;
+
+ ext_entry = lan966x_ext_find_entry(dev);
+ if (ext_entry) {
+ if (ext_entry->lan966x)
+ return false;
+
+ ext_entry->ports++;
+ return true;
+ }
+
+ ext_entry = kzalloc(sizeof(*ext_entry), GFP_KERNEL);
+ if (!ext_entry)
+ return false;
+
+ ext_entry->dev = dev;
+ ext_entry->ports = 1;
+ ext_entry->lan966x = lan966x;
+ list_add_tail(&ext_entry->list, &ext_entries);
+ return true;
+}
+
+static void lan966x_ext_remove_entry(struct net_device *dev)
+{
+ struct lan966x_ext_entry *ext_entry;
+
+ ext_entry = lan966x_ext_find_entry(dev);
+ if (!ext_entry)
+ return;
+
+ ext_entry->ports--;
+ if (!ext_entry->ports) {
+ list_del(&ext_entry->list);
+ kfree(ext_entry);
+ }
+}
+
+void lan966x_ext_purge_entries(void)
+{
+ struct lan966x_ext_entry *ext_entry, *tmp;
+
+ list_for_each_entry_safe(ext_entry, tmp, &ext_entries, list) {
+ list_del(&ext_entry->list);
+ kfree(ext_entry);
+ }
+}
+
+static int lan966x_ext_check_entry(struct net_device *dev,
+ unsigned long event,
+ void *ptr)
+{
+ struct netdev_notifier_changeupper_info *info;
+
+ if (event != NETDEV_PRECHANGEUPPER)
+ return 0;
+
+ info = ptr;
+ if (!netif_is_bridge_master(info->upper_dev))
+ return 0;
+
+ if (info->linking) {
+ if (!lan966x_ext_add_entry(info->upper_dev, NULL))
+ return -EOPNOTSUPP;
+ } else {
+ lan966x_ext_remove_entry(info->upper_dev);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static bool lan966x_port_ext_check_entry(struct net_device *dev,
+ struct netdev_notifier_changeupper_info *info)
+{
+ struct lan966x_port *port = netdev_priv(dev);
+ struct lan966x *lan966x = port->lan966x;
+ struct lan966x_ext_entry *entry;
+
+ if (!netif_is_bridge_master(info->upper_dev))
+ return true;
+
+ entry = lan966x_ext_find_entry(info->upper_dev);
+ if (info->linking) {
+ if (!entry)
+ return lan966x_ext_add_entry(info->upper_dev, lan966x);
+
+ if (entry->lan966x == lan966x) {
+ entry->ports++;
+ return true;
+ }
+ } else {
+ lan966x_ext_remove_entry(info->upper_dev);
+ return true;
+ }
+
+ return false;
+}
+
+static int lan966x_netdevice_port_event(struct net_device *dev,
+ struct notifier_block *nb,
+ unsigned long event, void *ptr)
+{
+ int err = 0;
+
+ if (!lan966x_netdevice_check(dev))
+ return lan966x_ext_check_entry(dev, event, ptr);
+
+ switch (event) {
+ case NETDEV_PRECHANGEUPPER:
+ if (!lan966x_port_ext_check_entry(dev, ptr))
+ return -EOPNOTSUPP;
+
+ err = lan966x_port_prechangeupper(dev, ptr);
+ break;
+ case NETDEV_CHANGEUPPER:
+ err = lan966x_port_changeupper(dev, ptr);
+ break;
+ case NETDEV_PRE_UP:
+ err = lan966x_port_add_addr(dev, true);
+ break;
+ case NETDEV_DOWN:
+ err = lan966x_port_add_addr(dev, false);
+ break;
+ }
+
+ return err;
+}
+
+static int lan966x_netdevice_event(struct notifier_block *nb,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ int ret;
+
+ ret = lan966x_netdevice_port_event(dev, nb, event, ptr);
+
+ return notifier_from_errno(ret);
+}
+
+static int lan966x_switchdev_event(struct notifier_block *nb,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
+ int err;
+
+ switch (event) {
+ case SWITCHDEV_PORT_ATTR_SET:
+ err = switchdev_handle_port_attr_set(dev, ptr,
+ lan966x_netdevice_check,
+ lan966x_port_attr_set);
+ return notifier_from_errno(err);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static int lan966x_switchdev_blocking_event(struct notifier_block *nb,
+ unsigned long event,
+ void *ptr)
+{
+ struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
+ int err;
+
+ switch (event) {
+ case SWITCHDEV_PORT_ATTR_SET:
+ err = switchdev_handle_port_attr_set(dev, ptr,
+ lan966x_netdevice_check,
+ lan966x_port_attr_set);
+ return notifier_from_errno(err);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block lan966x_netdevice_nb __read_mostly = {
+ .notifier_call = lan966x_netdevice_event,
+};
+
+static struct notifier_block lan966x_switchdev_nb __read_mostly = {
+ .notifier_call = lan966x_switchdev_event,
+};
+
+static struct notifier_block lan966x_switchdev_blocking_nb __read_mostly = {
+ .notifier_call = lan966x_switchdev_blocking_event,
+};
+
+void lan966x_register_notifier_blocks(struct lan966x *lan966x)
+{
+ register_netdevice_notifier(&lan966x_netdevice_nb);
+ register_switchdev_notifier(&lan966x_switchdev_nb);
+ register_switchdev_blocking_notifier(&lan966x_switchdev_blocking_nb);
+}
+
+void lan966x_unregister_notifier_blocks(struct lan966x *lan966x)
+{
+ unregister_switchdev_blocking_notifier(&lan966x_switchdev_blocking_nb);
+ unregister_switchdev_notifier(&lan966x_switchdev_nb);
+ unregister_netdevice_notifier(&lan966x_netdevice_nb);
+}
--
2.33.0
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