diff options
Diffstat (limited to 'net/dsa/dsa2.c')
-rw-r--r-- | net/dsa/dsa2.c | 190 |
1 files changed, 136 insertions, 54 deletions
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c index eef13cd20f19..826957b6442b 100644 --- a/net/dsa/dsa2.c +++ b/net/dsa/dsa2.c @@ -170,7 +170,7 @@ void dsa_bridge_num_put(const struct net_device *bridge_dev, int bridge_num) /* Check if the bridge is still in use, otherwise it is time * to clean it up so we can reuse this bridge_num later. */ - if (!dsa_bridge_num_find(bridge_dev)) + if (dsa_bridge_num_find(bridge_dev) < 0) clear_bit(bridge_num, &dsa_fwd_offloading_bridges); } @@ -399,11 +399,8 @@ static int dsa_tree_setup_cpu_ports(struct dsa_switch_tree *dst) if (!dsa_port_is_cpu(cpu_dp)) continue; - list_for_each_entry(dp, &dst->ports, list) { - /* Prefer a local CPU port */ - if (dp->ds != cpu_dp->ds) - continue; - + /* Prefer a local CPU port */ + dsa_switch_for_each_port(dp, cpu_dp->ds) { /* Prefer the first local CPU port found */ if (dp->cpu_dp) continue; @@ -429,15 +426,23 @@ static int dsa_port_setup(struct dsa_port *dp) { struct devlink_port *dlp = &dp->devlink_port; bool dsa_port_link_registered = false; + struct dsa_switch *ds = dp->ds; bool dsa_port_enabled = false; int err = 0; if (dp->setup) return 0; + mutex_init(&dp->addr_lists_lock); INIT_LIST_HEAD(&dp->fdbs); INIT_LIST_HEAD(&dp->mdbs); + if (ds->ops->port_setup) { + err = ds->ops->port_setup(ds, dp->index); + if (err) + return err; + } + switch (dp->type) { case DSA_PORT_TYPE_UNUSED: dsa_port_disable(dp); @@ -480,8 +485,11 @@ static int dsa_port_setup(struct dsa_port *dp) dsa_port_disable(dp); if (err && dsa_port_link_registered) dsa_port_link_unregister_of(dp); - if (err) + if (err) { + if (ds->ops->port_teardown) + ds->ops->port_teardown(ds, dp->index); return err; + } dp->setup = true; @@ -533,11 +541,15 @@ static int dsa_port_devlink_setup(struct dsa_port *dp) static void dsa_port_teardown(struct dsa_port *dp) { struct devlink_port *dlp = &dp->devlink_port; + struct dsa_switch *ds = dp->ds; struct dsa_mac_addr *a, *tmp; if (!dp->setup) return; + if (ds->ops->port_teardown) + ds->ops->port_teardown(ds, dp->index); + devlink_port_type_clear(dlp); switch (dp->type) { @@ -581,6 +593,36 @@ static void dsa_port_devlink_teardown(struct dsa_port *dp) dp->devlink_port_setup = false; } +/* Destroy the current devlink port, and create a new one which has the UNUSED + * flavour. At this point, any call to ds->ops->port_setup has been already + * balanced out by a call to ds->ops->port_teardown, so we know that any + * devlink port regions the driver had are now unregistered. We then call its + * ds->ops->port_setup again, in order for the driver to re-create them on the + * new devlink port. + */ +static int dsa_port_reinit_as_unused(struct dsa_port *dp) +{ + struct dsa_switch *ds = dp->ds; + int err; + + dsa_port_devlink_teardown(dp); + dp->type = DSA_PORT_TYPE_UNUSED; + err = dsa_port_devlink_setup(dp); + if (err) + return err; + + if (ds->ops->port_setup) { + /* On error, leave the devlink port registered, + * dsa_switch_teardown will clean it up later. + */ + err = ds->ops->port_setup(ds, dp->index); + if (err) + return err; + } + + return 0; +} + static int dsa_devlink_info_get(struct devlink *dl, struct devlink_info_req *req, struct netlink_ext_ack *extack) @@ -758,16 +800,17 @@ static int dsa_switch_setup_tag_protocol(struct dsa_switch *ds) { const struct dsa_device_ops *tag_ops = ds->dst->tag_ops; struct dsa_switch_tree *dst = ds->dst; - int port, err; + struct dsa_port *cpu_dp; + int err; if (tag_ops->proto == dst->default_proto) return 0; - for (port = 0; port < ds->num_ports; port++) { - if (!dsa_is_cpu_port(ds, port)) - continue; - - err = ds->ops->change_tag_protocol(ds, port, tag_ops->proto); + dsa_switch_for_each_cpu_port(cpu_dp, ds) { + rtnl_lock(); + err = ds->ops->change_tag_protocol(ds, cpu_dp->index, + tag_ops->proto); + rtnl_unlock(); if (err) { dev_err(ds->dev, "Unable to use tag protocol \"%s\": %pe\n", tag_ops->name, ERR_PTR(err)); @@ -804,19 +847,13 @@ static int dsa_switch_setup(struct dsa_switch *ds) dl_priv = devlink_priv(ds->devlink); dl_priv->ds = ds; - err = devlink_register(ds->devlink); - if (err) - goto free_devlink; - /* Setup devlink port instances now, so that the switch * setup() can register regions etc, against the ports */ - list_for_each_entry(dp, &ds->dst->ports, list) { - if (dp->ds == ds) { - err = dsa_port_devlink_setup(dp); - if (err) - goto unregister_devlink_ports; - } + dsa_switch_for_each_port(dp, ds) { + err = dsa_port_devlink_setup(dp); + if (err) + goto unregister_devlink_ports; } err = dsa_switch_register_notifier(ds); @@ -833,10 +870,8 @@ static int dsa_switch_setup(struct dsa_switch *ds) if (err) goto teardown; - devlink_params_publish(ds->devlink); - if (!ds->slave_mii_bus && ds->ops->phy_read) { - ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev); + ds->slave_mii_bus = mdiobus_alloc(); if (!ds->slave_mii_bus) { err = -ENOMEM; goto teardown; @@ -846,27 +881,26 @@ static int dsa_switch_setup(struct dsa_switch *ds) err = mdiobus_register(ds->slave_mii_bus); if (err < 0) - goto teardown; + goto free_slave_mii_bus; } ds->setup = true; - + devlink_register(ds->devlink); return 0; +free_slave_mii_bus: + if (ds->slave_mii_bus && ds->ops->phy_read) + mdiobus_free(ds->slave_mii_bus); teardown: if (ds->ops->teardown) ds->ops->teardown(ds); unregister_notifier: dsa_switch_unregister_notifier(ds); unregister_devlink_ports: - list_for_each_entry(dp, &ds->dst->ports, list) - if (dp->ds == ds) - dsa_port_devlink_teardown(dp); - devlink_unregister(ds->devlink); -free_devlink: + dsa_switch_for_each_port(dp, ds) + dsa_port_devlink_teardown(dp); devlink_free(ds->devlink); ds->devlink = NULL; - return err; } @@ -877,19 +911,23 @@ static void dsa_switch_teardown(struct dsa_switch *ds) if (!ds->setup) return; - if (ds->slave_mii_bus && ds->ops->phy_read) - mdiobus_unregister(ds->slave_mii_bus); + if (ds->devlink) + devlink_unregister(ds->devlink); - dsa_switch_unregister_notifier(ds); + if (ds->slave_mii_bus && ds->ops->phy_read) { + mdiobus_unregister(ds->slave_mii_bus); + mdiobus_free(ds->slave_mii_bus); + ds->slave_mii_bus = NULL; + } if (ds->ops->teardown) ds->ops->teardown(ds); + dsa_switch_unregister_notifier(ds); + if (ds->devlink) { - list_for_each_entry(dp, &ds->dst->ports, list) - if (dp->ds == ds) - dsa_port_devlink_teardown(dp); - devlink_unregister(ds->devlink); + dsa_switch_for_each_port(dp, ds) + dsa_port_devlink_teardown(dp); devlink_free(ds->devlink); ds->devlink = NULL; } @@ -938,12 +976,9 @@ static int dsa_tree_setup_switches(struct dsa_switch_tree *dst) list_for_each_entry(dp, &dst->ports, list) { err = dsa_port_setup(dp); if (err) { - dsa_port_devlink_teardown(dp); - dp->type = DSA_PORT_TYPE_UNUSED; - err = dsa_port_devlink_setup(dp); + err = dsa_port_reinit_as_unused(dp); if (err) goto teardown; - continue; } } @@ -1048,6 +1083,7 @@ static int dsa_tree_setup(struct dsa_switch_tree *dst) teardown_master: dsa_tree_teardown_master(dst); teardown_switches: + dsa_tree_teardown_ports(dst); dsa_tree_teardown_switches(dst); teardown_cpu_ports: dsa_tree_teardown_cpu_ports(dst); @@ -1107,7 +1143,7 @@ int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst, goto out_unlock; list_for_each_entry(dp, &dst->ports, list) { - if (!dsa_is_user_port(dp->ds, dp->index)) + if (!dsa_port_is_user(dp)) continue; if (dp->slave->flags & IFF_UP) @@ -1138,8 +1174,8 @@ static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index) struct dsa_switch_tree *dst = ds->dst; struct dsa_port *dp; - list_for_each_entry(dp, &dst->ports, list) - if (dp->ds == ds && dp->index == index) + dsa_switch_for_each_port(dp, ds) + if (dp->index == index) return dp; dp = kzalloc(sizeof(*dp), GFP_KERNEL); @@ -1324,12 +1360,15 @@ static int dsa_switch_parse_ports_of(struct dsa_switch *ds, for_each_available_child_of_node(ports, port) { err = of_property_read_u32(port, "reg", ®); - if (err) + if (err) { + of_node_put(port); goto out_put_node; + } if (reg >= ds->num_ports) { dev_err(ds->dev, "port %pOF index %u exceeds num_ports (%zu)\n", port, reg, ds->num_ports); + of_node_put(port); err = -EINVAL; goto out_put_node; } @@ -1337,8 +1376,10 @@ static int dsa_switch_parse_ports_of(struct dsa_switch *ds, dp = dsa_to_port(ds, reg); err = dsa_port_parse_of(dp, port); - if (err) + if (err) { + of_node_put(port); goto out_put_node; + } } out_put_node: @@ -1480,12 +1521,9 @@ static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd) static void dsa_switch_release_ports(struct dsa_switch *ds) { - struct dsa_switch_tree *dst = ds->dst; struct dsa_port *dp, *next; - list_for_each_entry_safe(dp, next, &dst->ports, list) { - if (dp->ds != ds) - continue; + dsa_switch_for_each_port_safe(dp, next, ds) { list_del(&dp->list); kfree(dp); } @@ -1562,3 +1600,47 @@ void dsa_unregister_switch(struct dsa_switch *ds) mutex_unlock(&dsa2_mutex); } EXPORT_SYMBOL_GPL(dsa_unregister_switch); + +/* If the DSA master chooses to unregister its net_device on .shutdown, DSA is + * blocking that operation from completion, due to the dev_hold taken inside + * netdev_upper_dev_link. Unlink the DSA slave interfaces from being uppers of + * the DSA master, so that the system can reboot successfully. + */ +void dsa_switch_shutdown(struct dsa_switch *ds) +{ + struct net_device *master, *slave_dev; + LIST_HEAD(unregister_list); + struct dsa_port *dp; + + mutex_lock(&dsa2_mutex); + rtnl_lock(); + + dsa_switch_for_each_user_port(dp, ds) { + master = dp->cpu_dp->master; + slave_dev = dp->slave; + + netdev_upper_dev_unlink(master, slave_dev); + /* Just unlinking ourselves as uppers of the master is not + * sufficient. When the master net device unregisters, that will + * also call dev_close, which we will catch as NETDEV_GOING_DOWN + * and trigger a dev_close on our own devices (dsa_slave_close). + * In turn, that will call dev_mc_unsync on the master's net + * device. If the master is also a DSA switch port, this will + * trigger dsa_slave_set_rx_mode which will call dev_mc_sync on + * its own master. Lockdep will complain about the fact that + * all cascaded masters have the same dsa_master_addr_list_lock_key, + * which it normally would not do if the cascaded masters would + * be in a proper upper/lower relationship, which we've just + * destroyed. + * To suppress the lockdep warnings, let's actually unregister + * the DSA slave interfaces too, to avoid the nonsensical + * multicast address list synchronization on shutdown. + */ + unregister_netdevice_queue(slave_dev, &unregister_list); + } + unregister_netdevice_many(&unregister_list); + + rtnl_unlock(); + mutex_unlock(&dsa2_mutex); +} +EXPORT_SYMBOL_GPL(dsa_switch_shutdown); |