diff options
Diffstat (limited to 'drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c')
| -rw-r--r-- | drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c | 544 |
1 files changed, 544 insertions, 0 deletions
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..7de55f6a4da8 --- /dev/null +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_switchdev.c @@ -0,0 +1,544 @@ +// 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 void lan966x_port_set_mcast_flood(struct lan966x_port *port, + bool enabled) +{ + u32 val = lan_rd(port->lan966x, ANA_PGID(PGID_MC)); + + val = ANA_PGID_PGID_GET(val); + if (enabled) + val |= BIT(port->chip_port); + else + val &= ~BIT(port->chip_port); + + lan_rmw(ANA_PGID_PGID_SET(val), + ANA_PGID_PGID, + port->lan966x, ANA_PGID(PGID_MC)); +} + +static void lan966x_port_set_ucast_flood(struct lan966x_port *port, + bool enabled) +{ + u32 val = lan_rd(port->lan966x, ANA_PGID(PGID_UC)); + + val = ANA_PGID_PGID_GET(val); + if (enabled) + val |= BIT(port->chip_port); + else + val &= ~BIT(port->chip_port); + + lan_rmw(ANA_PGID_PGID_SET(val), + ANA_PGID_PGID, + port->lan966x, ANA_PGID(PGID_UC)); +} + +static void lan966x_port_set_bcast_flood(struct lan966x_port *port, + bool enabled) +{ + u32 val = lan_rd(port->lan966x, ANA_PGID(PGID_BC)); + + val = ANA_PGID_PGID_GET(val); + if (enabled) + val |= BIT(port->chip_port); + else + val &= ~BIT(port->chip_port); + + lan_rmw(ANA_PGID_PGID_SET(val), + ANA_PGID_PGID, + port->lan966x, ANA_PGID(PGID_BC)); +} + +static void lan966x_port_set_learning(struct lan966x_port *port, bool enabled) +{ + lan_rmw(ANA_PORT_CFG_LEARN_ENA_SET(enabled), + ANA_PORT_CFG_LEARN_ENA, + port->lan966x, ANA_PORT_CFG(port->chip_port)); + + port->learn_ena = enabled; +} + +static void lan966x_port_bridge_flags(struct lan966x_port *port, + struct switchdev_brport_flags flags) +{ + if (flags.mask & BR_MCAST_FLOOD) + lan966x_port_set_mcast_flood(port, + !!(flags.val & BR_MCAST_FLOOD)); + + if (flags.mask & BR_FLOOD) + lan966x_port_set_ucast_flood(port, + !!(flags.val & BR_FLOOD)); + + if (flags.mask & BR_BCAST_FLOOD) + lan966x_port_set_bcast_flood(port, + !!(flags.val & BR_BCAST_FLOOD)); + + if (flags.mask & BR_LEARNING) + lan966x_port_set_learning(port, + !!(flags.val & BR_LEARNING)); +} + +static int lan966x_port_pre_bridge_flags(struct lan966x_port *port, + struct switchdev_brport_flags flags) +{ + if (flags.mask & ~(BR_MCAST_FLOOD | BR_FLOOD | BR_BCAST_FLOOD | + BR_LEARNING)) + return -EINVAL; + + return 0; +} + +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) && + port->learn_ena) + 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_BRIDGE_FLAGS: + lan966x_port_bridge_flags(port, attr->u.brport_flags); + break; + case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS: + err = lan966x_port_pre_bridge_flags(port, attr->u.brport_flags); + break; + 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; + case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING: + lan966x_vlan_port_set_vlan_aware(port, attr->u.vlan_filtering); + lan966x_vlan_port_apply(port); + 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 switchdev_brport_flags flags = {0}; + 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) { + NL_SET_ERR_MSG_MOD(extack, "Not allow to add port to different 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); + + flags.mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD; + flags.val = flags.mask; + lan966x_port_bridge_flags(port, flags); + + return 0; +} + +static void lan966x_port_bridge_leave(struct lan966x_port *port, + struct net_device *bridge) +{ + struct switchdev_brport_flags flags = {0}; + struct lan966x *lan966x = port->lan966x; + + flags.mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD; + flags.val = flags.mask & ~BR_LEARNING; + lan966x_port_bridge_flags(port, flags); + + lan966x->bridge_mask &= ~BIT(port->chip_port); + + if (!lan966x->bridge_mask) + lan966x->bridge = NULL; + + /* Set the port back to host mode */ + lan966x_vlan_port_set_vlan_aware(port, false); + lan966x_vlan_port_set_vid(port, HOST_PVID, false, false); + lan966x_vlan_port_apply(port); +} + +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_foreign_bridging_check(struct net_device *bridge, + struct netlink_ext_ack *extack) +{ + struct lan966x *lan966x = NULL; + bool has_foreign = false; + struct net_device *dev; + struct list_head *iter; + + if (!netif_is_bridge_master(bridge)) + return 0; + + netdev_for_each_lower_dev(bridge, dev, iter) { + if (lan966x_netdevice_check(dev)) { + struct lan966x_port *port = netdev_priv(dev); + + if (lan966x) { + /* Bridge already has at least one port of a + * lan966x switch inside it, check that it's + * the same instance of the driver. + */ + if (port->lan966x != lan966x) { + NL_SET_ERR_MSG_MOD(extack, + "Bridging between multiple lan966x switches disallowed"); + return -EINVAL; + } + } else { + /* This is the first lan966x port inside this + * bridge + */ + lan966x = port->lan966x; + } + } else { + has_foreign = true; + } + + if (lan966x && has_foreign) { + NL_SET_ERR_MSG_MOD(extack, + "Bridging lan966x ports with foreign interfaces disallowed"); + return -EINVAL; + } + } + + return 0; +} + +static int lan966x_bridge_check(struct net_device *dev, + struct netdev_notifier_changeupper_info *info) +{ + return lan966x_foreign_bridging_check(info->upper_dev, + info->info.extack); +} + +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)) { + if (event == NETDEV_CHANGEUPPER) + return lan966x_bridge_check(dev, ptr); + return 0; + } + + switch (event) { + case NETDEV_PRECHANGEUPPER: + err = lan966x_port_prechangeupper(dev, ptr); + break; + case NETDEV_CHANGEUPPER: + err = lan966x_bridge_check(dev, ptr); + if (err) + return err; + + err = lan966x_port_changeupper(dev, ptr); + 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 bool lan966x_foreign_dev_check(const struct net_device *dev, + const struct net_device *foreign_dev) +{ + struct lan966x_port *port = netdev_priv(dev); + struct lan966x *lan966x = port->lan966x; + + if (netif_is_bridge_master(foreign_dev)) + if (lan966x->bridge != foreign_dev) + return true; + + return false; +} + +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); + case SWITCHDEV_FDB_ADD_TO_DEVICE: + case SWITCHDEV_FDB_DEL_TO_DEVICE: + err = switchdev_handle_fdb_event_to_device(dev, event, ptr, + lan966x_netdevice_check, + lan966x_foreign_dev_check, + lan966x_handle_fdb, + NULL); + return notifier_from_errno(err); + } + + return NOTIFY_DONE; +} + +static int lan966x_handle_port_vlan_add(struct lan966x_port *port, + const struct switchdev_obj *obj) +{ + const struct switchdev_obj_port_vlan *v = SWITCHDEV_OBJ_PORT_VLAN(obj); + struct lan966x *lan966x = port->lan966x; + + /* When adding a port to a vlan, we get a callback for the port but + * also for the bridge. When get the callback for the bridge just bail + * out. Then when the bridge is added to the vlan, then we get a + * callback here but in this case the flags has set: + * BRIDGE_VLAN_INFO_BRENTRY. In this case it means that the CPU + * port is added to the vlan, so the broadcast frames and unicast frames + * with dmac of the bridge should be foward to CPU. + */ + if (netif_is_bridge_master(obj->orig_dev) && + !(v->flags & BRIDGE_VLAN_INFO_BRENTRY)) + return 0; + + if (!netif_is_bridge_master(obj->orig_dev)) + lan966x_vlan_port_add_vlan(port, v->vid, + v->flags & BRIDGE_VLAN_INFO_PVID, + v->flags & BRIDGE_VLAN_INFO_UNTAGGED); + else + lan966x_vlan_cpu_add_vlan(lan966x, v->vid); + + return 0; +} + +static int lan966x_handle_port_obj_add(struct net_device *dev, const void *ctx, + const struct switchdev_obj *obj, + struct netlink_ext_ack *extack) +{ + struct lan966x_port *port = netdev_priv(dev); + int err; + + if (ctx && ctx != port) + return 0; + + switch (obj->id) { + case SWITCHDEV_OBJ_ID_PORT_VLAN: + err = lan966x_handle_port_vlan_add(port, obj); + break; + case SWITCHDEV_OBJ_ID_PORT_MDB: + case SWITCHDEV_OBJ_ID_HOST_MDB: + err = lan966x_handle_port_mdb_add(port, obj); + break; + default: + err = -EOPNOTSUPP; + break; + } + + return err; +} + +static int lan966x_handle_port_vlan_del(struct lan966x_port *port, + const struct switchdev_obj *obj) +{ + const struct switchdev_obj_port_vlan *v = SWITCHDEV_OBJ_PORT_VLAN(obj); + struct lan966x *lan966x = port->lan966x; + + if (!netif_is_bridge_master(obj->orig_dev)) + lan966x_vlan_port_del_vlan(port, v->vid); + else + lan966x_vlan_cpu_del_vlan(lan966x, v->vid); + + return 0; +} + +static int lan966x_handle_port_obj_del(struct net_device *dev, const void *ctx, + const struct switchdev_obj *obj) +{ + struct lan966x_port *port = netdev_priv(dev); + int err; + + if (ctx && ctx != port) + return 0; + + switch (obj->id) { + case SWITCHDEV_OBJ_ID_PORT_VLAN: + err = lan966x_handle_port_vlan_del(port, obj); + break; + case SWITCHDEV_OBJ_ID_PORT_MDB: + case SWITCHDEV_OBJ_ID_HOST_MDB: + err = lan966x_handle_port_mdb_del(port, obj); + break; + default: + err = -EOPNOTSUPP; + break; + } + + return err; +} + +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_OBJ_ADD: + err = switchdev_handle_port_obj_add(dev, ptr, + lan966x_netdevice_check, + lan966x_handle_port_obj_add); + return notifier_from_errno(err); + case SWITCHDEV_PORT_OBJ_DEL: + err = switchdev_handle_port_obj_del(dev, ptr, + lan966x_netdevice_check, + lan966x_handle_port_obj_del); + return notifier_from_errno(err); + 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(void) +{ + 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(void) +{ + unregister_switchdev_blocking_notifier(&lan966x_switchdev_blocking_nb); + unregister_switchdev_notifier(&lan966x_switchdev_nb); + unregister_netdevice_notifier(&lan966x_netdevice_nb); +} |