diff options
Diffstat (limited to '')
| -rw-r--r-- | net/dsa/dsa2.c | 1027 |
1 files changed, 1027 insertions, 0 deletions
diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c new file mode 100644 index 000000000..f543fca6d --- /dev/null +++ b/net/dsa/dsa2.c @@ -0,0 +1,1027 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/dsa/dsa2.c - Hardware switch handling, binding version 2 + * Copyright (c) 2008-2009 Marvell Semiconductor + * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org> + * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch> + */ + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/list.h> +#include <linux/netdevice.h> +#include <linux/slab.h> +#include <linux/rtnetlink.h> +#include <linux/of.h> +#include <linux/of_net.h> +#include <net/devlink.h> + +#include "dsa_priv.h" + +static DEFINE_MUTEX(dsa2_mutex); +LIST_HEAD(dsa_tree_list); + +struct dsa_switch *dsa_switch_find(int tree_index, int sw_index) +{ + struct dsa_switch_tree *dst; + struct dsa_port *dp; + + list_for_each_entry(dst, &dsa_tree_list, list) { + if (dst->index != tree_index) + continue; + + list_for_each_entry(dp, &dst->ports, list) { + if (dp->ds->index != sw_index) + continue; + + return dp->ds; + } + } + + return NULL; +} +EXPORT_SYMBOL_GPL(dsa_switch_find); + +static struct dsa_switch_tree *dsa_tree_find(int index) +{ + struct dsa_switch_tree *dst; + + list_for_each_entry(dst, &dsa_tree_list, list) + if (dst->index == index) + return dst; + + return NULL; +} + +static struct dsa_switch_tree *dsa_tree_alloc(int index) +{ + struct dsa_switch_tree *dst; + + dst = kzalloc(sizeof(*dst), GFP_KERNEL); + if (!dst) + return NULL; + + dst->index = index; + + INIT_LIST_HEAD(&dst->rtable); + + INIT_LIST_HEAD(&dst->ports); + + INIT_LIST_HEAD(&dst->list); + list_add_tail(&dst->list, &dsa_tree_list); + + kref_init(&dst->refcount); + + return dst; +} + +static void dsa_tree_free(struct dsa_switch_tree *dst) +{ + list_del(&dst->list); + kfree(dst); +} + +static struct dsa_switch_tree *dsa_tree_get(struct dsa_switch_tree *dst) +{ + if (dst) + kref_get(&dst->refcount); + + return dst; +} + +static struct dsa_switch_tree *dsa_tree_touch(int index) +{ + struct dsa_switch_tree *dst; + + dst = dsa_tree_find(index); + if (dst) + return dsa_tree_get(dst); + else + return dsa_tree_alloc(index); +} + +static void dsa_tree_release(struct kref *ref) +{ + struct dsa_switch_tree *dst; + + dst = container_of(ref, struct dsa_switch_tree, refcount); + + dsa_tree_free(dst); +} + +static void dsa_tree_put(struct dsa_switch_tree *dst) +{ + if (dst) + kref_put(&dst->refcount, dsa_tree_release); +} + +static bool dsa_port_is_dsa(struct dsa_port *port) +{ + return port->type == DSA_PORT_TYPE_DSA; +} + +static bool dsa_port_is_cpu(struct dsa_port *port) +{ + return port->type == DSA_PORT_TYPE_CPU; +} + +static bool dsa_port_is_user(struct dsa_port *dp) +{ + return dp->type == DSA_PORT_TYPE_USER; +} + +static struct dsa_port *dsa_tree_find_port_by_node(struct dsa_switch_tree *dst, + struct device_node *dn) +{ + struct dsa_port *dp; + + list_for_each_entry(dp, &dst->ports, list) + if (dp->dn == dn) + return dp; + + return NULL; +} + +static struct dsa_link *dsa_link_touch(struct dsa_port *dp, + struct dsa_port *link_dp) +{ + struct dsa_switch *ds = dp->ds; + struct dsa_switch_tree *dst; + struct dsa_link *dl; + + dst = ds->dst; + + list_for_each_entry(dl, &dst->rtable, list) + if (dl->dp == dp && dl->link_dp == link_dp) + return dl; + + dl = kzalloc(sizeof(*dl), GFP_KERNEL); + if (!dl) + return NULL; + + dl->dp = dp; + dl->link_dp = link_dp; + + INIT_LIST_HEAD(&dl->list); + list_add_tail(&dl->list, &dst->rtable); + + return dl; +} + +static bool dsa_port_setup_routing_table(struct dsa_port *dp) +{ + struct dsa_switch *ds = dp->ds; + struct dsa_switch_tree *dst = ds->dst; + struct device_node *dn = dp->dn; + struct of_phandle_iterator it; + struct dsa_port *link_dp; + struct dsa_link *dl; + int err; + + of_for_each_phandle(&it, err, dn, "link", NULL, 0) { + link_dp = dsa_tree_find_port_by_node(dst, it.node); + if (!link_dp) { + of_node_put(it.node); + return false; + } + + dl = dsa_link_touch(dp, link_dp); + if (!dl) { + of_node_put(it.node); + return false; + } + } + + return true; +} + +static bool dsa_tree_setup_routing_table(struct dsa_switch_tree *dst) +{ + bool complete = true; + struct dsa_port *dp; + + list_for_each_entry(dp, &dst->ports, list) { + if (dsa_port_is_dsa(dp)) { + complete = dsa_port_setup_routing_table(dp); + if (!complete) + break; + } + } + + return complete; +} + +static struct dsa_port *dsa_tree_find_first_cpu(struct dsa_switch_tree *dst) +{ + struct dsa_port *dp; + + list_for_each_entry(dp, &dst->ports, list) + if (dsa_port_is_cpu(dp)) + return dp; + + return NULL; +} + +static int dsa_tree_setup_default_cpu(struct dsa_switch_tree *dst) +{ + struct dsa_port *cpu_dp, *dp; + + cpu_dp = dsa_tree_find_first_cpu(dst); + if (!cpu_dp) { + pr_err("DSA: tree %d has no CPU port\n", dst->index); + return -EINVAL; + } + + /* Assign the default CPU port to all ports of the fabric */ + list_for_each_entry(dp, &dst->ports, list) + if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp)) + dp->cpu_dp = cpu_dp; + + return 0; +} + +static void dsa_tree_teardown_default_cpu(struct dsa_switch_tree *dst) +{ + struct dsa_port *dp; + + list_for_each_entry(dp, &dst->ports, list) + if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp)) + dp->cpu_dp = NULL; +} + +static int dsa_port_setup(struct dsa_port *dp) +{ + struct devlink_port *dlp = &dp->devlink_port; + bool dsa_port_link_registered = false; + bool dsa_port_enabled = false; + int err = 0; + + if (dp->setup) + return 0; + + switch (dp->type) { + case DSA_PORT_TYPE_UNUSED: + dsa_port_disable(dp); + break; + case DSA_PORT_TYPE_CPU: + err = dsa_port_link_register_of(dp); + if (err) + break; + dsa_port_link_registered = true; + + err = dsa_port_enable(dp, NULL); + if (err) + break; + dsa_port_enabled = true; + + break; + case DSA_PORT_TYPE_DSA: + err = dsa_port_link_register_of(dp); + if (err) + break; + dsa_port_link_registered = true; + + err = dsa_port_enable(dp, NULL); + if (err) + break; + dsa_port_enabled = true; + + break; + case DSA_PORT_TYPE_USER: + dp->mac = of_get_mac_address(dp->dn); + err = dsa_slave_create(dp); + if (err) + break; + + devlink_port_type_eth_set(dlp, dp->slave); + break; + } + + if (err && dsa_port_enabled) + dsa_port_disable(dp); + if (err && dsa_port_link_registered) + dsa_port_link_unregister_of(dp); + if (err) + return err; + + dp->setup = true; + + return 0; +} + +static int dsa_port_devlink_setup(struct dsa_port *dp) +{ + struct devlink_port *dlp = &dp->devlink_port; + struct dsa_switch_tree *dst = dp->ds->dst; + struct devlink_port_attrs attrs = {}; + struct devlink *dl = dp->ds->devlink; + const unsigned char *id; + unsigned char len; + int err; + + id = (const unsigned char *)&dst->index; + len = sizeof(dst->index); + + attrs.phys.port_number = dp->index; + memcpy(attrs.switch_id.id, id, len); + attrs.switch_id.id_len = len; + memset(dlp, 0, sizeof(*dlp)); + + switch (dp->type) { + case DSA_PORT_TYPE_UNUSED: + attrs.flavour = DEVLINK_PORT_FLAVOUR_UNUSED; + break; + case DSA_PORT_TYPE_CPU: + attrs.flavour = DEVLINK_PORT_FLAVOUR_CPU; + break; + case DSA_PORT_TYPE_DSA: + attrs.flavour = DEVLINK_PORT_FLAVOUR_DSA; + break; + case DSA_PORT_TYPE_USER: + attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL; + break; + } + + devlink_port_attrs_set(dlp, &attrs); + err = devlink_port_register(dl, dlp, dp->index); + + if (!err) + dp->devlink_port_setup = true; + + return err; +} + +static void dsa_port_teardown(struct dsa_port *dp) +{ + struct devlink_port *dlp = &dp->devlink_port; + + if (!dp->setup) + return; + + devlink_port_type_clear(dlp); + + switch (dp->type) { + case DSA_PORT_TYPE_UNUSED: + break; + case DSA_PORT_TYPE_CPU: + dsa_port_disable(dp); + dsa_tag_driver_put(dp->tag_ops); + dsa_port_link_unregister_of(dp); + break; + case DSA_PORT_TYPE_DSA: + dsa_port_disable(dp); + dsa_port_link_unregister_of(dp); + break; + case DSA_PORT_TYPE_USER: + if (dp->slave) { + dsa_slave_destroy(dp->slave); + dp->slave = NULL; + } + break; + } + + dp->setup = false; +} + +static void dsa_port_devlink_teardown(struct dsa_port *dp) +{ + struct devlink_port *dlp = &dp->devlink_port; + + if (dp->devlink_port_setup) + devlink_port_unregister(dlp); + dp->devlink_port_setup = false; +} + +static int dsa_devlink_info_get(struct devlink *dl, + struct devlink_info_req *req, + struct netlink_ext_ack *extack) +{ + struct dsa_switch *ds = dsa_devlink_to_ds(dl); + + if (ds->ops->devlink_info_get) + return ds->ops->devlink_info_get(ds, req, extack); + + return -EOPNOTSUPP; +} + +static const struct devlink_ops dsa_devlink_ops = { + .info_get = dsa_devlink_info_get, +}; + +static int dsa_switch_setup(struct dsa_switch *ds) +{ + struct dsa_devlink_priv *dl_priv; + struct dsa_port *dp; + int err; + + if (ds->setup) + return 0; + + /* Initialize ds->phys_mii_mask before registering the slave MDIO bus + * driver and before ops->setup() has run, since the switch drivers and + * the slave MDIO bus driver rely on these values for probing PHY + * devices or not + */ + ds->phys_mii_mask |= dsa_user_ports(ds); + + /* Add the switch to devlink before calling setup, so that setup can + * add dpipe tables + */ + ds->devlink = devlink_alloc(&dsa_devlink_ops, sizeof(*dl_priv)); + if (!ds->devlink) + return -ENOMEM; + dl_priv = devlink_priv(ds->devlink); + dl_priv->ds = ds; + + err = devlink_register(ds->devlink, ds->dev); + 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; + } + } + + err = dsa_switch_register_notifier(ds); + if (err) + goto unregister_devlink_ports; + + err = ds->ops->setup(ds); + if (err < 0) + goto unregister_notifier; + + devlink_params_publish(ds->devlink); + + if (!ds->slave_mii_bus && ds->ops->phy_read) { + ds->slave_mii_bus = mdiobus_alloc(); + if (!ds->slave_mii_bus) { + err = -ENOMEM; + goto teardown; + } + + dsa_slave_mii_bus_init(ds); + + err = mdiobus_register(ds->slave_mii_bus); + if (err < 0) + goto free_slave_mii_bus; + } + + ds->setup = true; + + 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: + devlink_free(ds->devlink); + ds->devlink = NULL; + + return err; +} + +static void dsa_switch_teardown(struct dsa_switch *ds) +{ + struct dsa_port *dp; + + if (!ds->setup) + return; + + 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; + } + + dsa_switch_unregister_notifier(ds); + + if (ds->ops->teardown) + ds->ops->teardown(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); + devlink_free(ds->devlink); + ds->devlink = NULL; + } + + ds->setup = false; +} + +static int dsa_tree_setup_switches(struct dsa_switch_tree *dst) +{ + struct dsa_port *dp; + int err; + + list_for_each_entry(dp, &dst->ports, list) { + err = dsa_switch_setup(dp->ds); + if (err) + goto teardown; + } + + 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); + if (err) + goto teardown; + continue; + } + } + + return 0; + +teardown: + list_for_each_entry(dp, &dst->ports, list) + dsa_port_teardown(dp); + + list_for_each_entry(dp, &dst->ports, list) + dsa_switch_teardown(dp->ds); + + return err; +} + +static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst) +{ + struct dsa_port *dp; + + list_for_each_entry(dp, &dst->ports, list) + dsa_port_teardown(dp); + + list_for_each_entry(dp, &dst->ports, list) + dsa_switch_teardown(dp->ds); +} + +static int dsa_tree_setup_master(struct dsa_switch_tree *dst) +{ + struct dsa_port *dp; + int err; + + list_for_each_entry(dp, &dst->ports, list) { + if (dsa_port_is_cpu(dp)) { + err = dsa_master_setup(dp->master, dp); + if (err) + return err; + } + } + + return 0; +} + +static void dsa_tree_teardown_master(struct dsa_switch_tree *dst) +{ + struct dsa_port *dp; + + list_for_each_entry(dp, &dst->ports, list) + if (dsa_port_is_cpu(dp)) + dsa_master_teardown(dp->master); +} + +static int dsa_tree_setup(struct dsa_switch_tree *dst) +{ + bool complete; + int err; + + if (dst->setup) { + pr_err("DSA: tree %d already setup! Disjoint trees?\n", + dst->index); + return -EEXIST; + } + + complete = dsa_tree_setup_routing_table(dst); + if (!complete) + return 0; + + err = dsa_tree_setup_default_cpu(dst); + if (err) + return err; + + err = dsa_tree_setup_switches(dst); + if (err) + goto teardown_default_cpu; + + err = dsa_tree_setup_master(dst); + if (err) + goto teardown_switches; + + dst->setup = true; + + pr_info("DSA: tree %d setup\n", dst->index); + + return 0; + +teardown_switches: + dsa_tree_teardown_switches(dst); +teardown_default_cpu: + dsa_tree_teardown_default_cpu(dst); + + return err; +} + +static void dsa_tree_teardown(struct dsa_switch_tree *dst) +{ + struct dsa_link *dl, *next; + + if (!dst->setup) + return; + + dsa_tree_teardown_master(dst); + + dsa_tree_teardown_switches(dst); + + dsa_tree_teardown_default_cpu(dst); + + list_for_each_entry_safe(dl, next, &dst->rtable, list) { + list_del(&dl->list); + kfree(dl); + } + + pr_info("DSA: tree %d torn down\n", dst->index); + + dst->setup = false; +} + +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) + return dp; + + dp = kzalloc(sizeof(*dp), GFP_KERNEL); + if (!dp) + return NULL; + + dp->ds = ds; + dp->index = index; + + INIT_LIST_HEAD(&dp->list); + list_add_tail(&dp->list, &dst->ports); + + return dp; +} + +static int dsa_port_parse_user(struct dsa_port *dp, const char *name) +{ + if (!name) + name = "eth%d"; + + dp->type = DSA_PORT_TYPE_USER; + dp->name = name; + + return 0; +} + +static int dsa_port_parse_dsa(struct dsa_port *dp) +{ + dp->type = DSA_PORT_TYPE_DSA; + + return 0; +} + +static enum dsa_tag_protocol dsa_get_tag_protocol(struct dsa_port *dp, + struct net_device *master) +{ + enum dsa_tag_protocol tag_protocol = DSA_TAG_PROTO_NONE; + struct dsa_switch *mds, *ds = dp->ds; + unsigned int mdp_upstream; + struct dsa_port *mdp; + + /* It is possible to stack DSA switches onto one another when that + * happens the switch driver may want to know if its tagging protocol + * is going to work in such a configuration. + */ + if (dsa_slave_dev_check(master)) { + mdp = dsa_slave_to_port(master); + mds = mdp->ds; + mdp_upstream = dsa_upstream_port(mds, mdp->index); + tag_protocol = mds->ops->get_tag_protocol(mds, mdp_upstream, + DSA_TAG_PROTO_NONE); + } + + /* If the master device is not itself a DSA slave in a disjoint DSA + * tree, then return immediately. + */ + return ds->ops->get_tag_protocol(ds, dp->index, tag_protocol); +} + +static int dsa_port_parse_cpu(struct dsa_port *dp, struct net_device *master) +{ + struct dsa_switch *ds = dp->ds; + struct dsa_switch_tree *dst = ds->dst; + const struct dsa_device_ops *tag_ops; + enum dsa_tag_protocol tag_protocol; + + tag_protocol = dsa_get_tag_protocol(dp, master); + tag_ops = dsa_tag_driver_get(tag_protocol); + if (IS_ERR(tag_ops)) { + if (PTR_ERR(tag_ops) == -ENOPROTOOPT) + return -EPROBE_DEFER; + dev_warn(ds->dev, "No tagger for this switch\n"); + dp->master = NULL; + return PTR_ERR(tag_ops); + } + + dp->master = master; + dp->type = DSA_PORT_TYPE_CPU; + dp->filter = tag_ops->filter; + dp->rcv = tag_ops->rcv; + dp->tag_ops = tag_ops; + dp->dst = dst; + + return 0; +} + +static int dsa_port_parse_of(struct dsa_port *dp, struct device_node *dn) +{ + struct device_node *ethernet = of_parse_phandle(dn, "ethernet", 0); + const char *name = of_get_property(dn, "label", NULL); + bool link = of_property_read_bool(dn, "link"); + + dp->dn = dn; + + if (ethernet) { + struct net_device *master; + + master = of_find_net_device_by_node(ethernet); + of_node_put(ethernet); + if (!master) + return -EPROBE_DEFER; + + return dsa_port_parse_cpu(dp, master); + } + + if (link) + return dsa_port_parse_dsa(dp); + + return dsa_port_parse_user(dp, name); +} + +static int dsa_switch_parse_ports_of(struct dsa_switch *ds, + struct device_node *dn) +{ + struct device_node *ports, *port; + struct dsa_port *dp; + int err = 0; + u32 reg; + + ports = of_get_child_by_name(dn, "ports"); + if (!ports) { + /* The second possibility is "ethernet-ports" */ + ports = of_get_child_by_name(dn, "ethernet-ports"); + if (!ports) { + dev_err(ds->dev, "no ports child node found\n"); + return -EINVAL; + } + } + + for_each_available_child_of_node(ports, port) { + err = of_property_read_u32(port, "reg", ®); + if (err) + goto out_put_node; + + if (reg >= ds->num_ports) { + err = -EINVAL; + goto out_put_node; + } + + dp = dsa_to_port(ds, reg); + + err = dsa_port_parse_of(dp, port); + if (err) + goto out_put_node; + } + +out_put_node: + of_node_put(ports); + return err; +} + +static int dsa_switch_parse_member_of(struct dsa_switch *ds, + struct device_node *dn) +{ + u32 m[2] = { 0, 0 }; + int sz; + + /* Don't error out if this optional property isn't found */ + sz = of_property_read_variable_u32_array(dn, "dsa,member", m, 2, 2); + if (sz < 0 && sz != -EINVAL) + return sz; + + ds->index = m[1]; + + ds->dst = dsa_tree_touch(m[0]); + if (!ds->dst) + return -ENOMEM; + + return 0; +} + +static int dsa_switch_touch_ports(struct dsa_switch *ds) +{ + struct dsa_port *dp; + int port; + + for (port = 0; port < ds->num_ports; port++) { + dp = dsa_port_touch(ds, port); + if (!dp) + return -ENOMEM; + } + + return 0; +} + +static int dsa_switch_parse_of(struct dsa_switch *ds, struct device_node *dn) +{ + int err; + + err = dsa_switch_parse_member_of(ds, dn); + if (err) + return err; + + err = dsa_switch_touch_ports(ds); + if (err) + return err; + + return dsa_switch_parse_ports_of(ds, dn); +} + +static int dsa_port_parse(struct dsa_port *dp, const char *name, + struct device *dev) +{ + if (!strcmp(name, "cpu")) { + struct net_device *master; + + master = dsa_dev_to_net_device(dev); + if (!master) + return -EPROBE_DEFER; + + dev_put(master); + + return dsa_port_parse_cpu(dp, master); + } + + if (!strcmp(name, "dsa")) + return dsa_port_parse_dsa(dp); + + return dsa_port_parse_user(dp, name); +} + +static int dsa_switch_parse_ports(struct dsa_switch *ds, + struct dsa_chip_data *cd) +{ + bool valid_name_found = false; + struct dsa_port *dp; + struct device *dev; + const char *name; + unsigned int i; + int err; + + for (i = 0; i < DSA_MAX_PORTS; i++) { + name = cd->port_names[i]; + dev = cd->netdev[i]; + dp = dsa_to_port(ds, i); + + if (!name) + continue; + + err = dsa_port_parse(dp, name, dev); + if (err) + return err; + + valid_name_found = true; + } + + if (!valid_name_found && i == DSA_MAX_PORTS) + return -EINVAL; + + return 0; +} + +static int dsa_switch_parse(struct dsa_switch *ds, struct dsa_chip_data *cd) +{ + int err; + + ds->cd = cd; + + /* We don't support interconnected switches nor multiple trees via + * platform data, so this is the unique switch of the tree. + */ + ds->index = 0; + ds->dst = dsa_tree_touch(0); + if (!ds->dst) + return -ENOMEM; + + err = dsa_switch_touch_ports(ds); + if (err) + return err; + + return dsa_switch_parse_ports(ds, 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; + list_del(&dp->list); + kfree(dp); + } +} + +static int dsa_switch_probe(struct dsa_switch *ds) +{ + struct dsa_switch_tree *dst; + struct dsa_chip_data *pdata; + struct device_node *np; + int err; + + if (!ds->dev) + return -ENODEV; + + pdata = ds->dev->platform_data; + np = ds->dev->of_node; + + if (!ds->num_ports) + return -EINVAL; + + if (np) { + err = dsa_switch_parse_of(ds, np); + if (err) + dsa_switch_release_ports(ds); + } else if (pdata) { + err = dsa_switch_parse(ds, pdata); + if (err) + dsa_switch_release_ports(ds); + } else { + err = -ENODEV; + } + + if (err) + return err; + + dst = ds->dst; + dsa_tree_get(dst); + err = dsa_tree_setup(dst); + if (err) { + dsa_switch_release_ports(ds); + dsa_tree_put(dst); + } + + return err; +} + +int dsa_register_switch(struct dsa_switch *ds) +{ + int err; + + mutex_lock(&dsa2_mutex); + err = dsa_switch_probe(ds); + dsa_tree_put(ds->dst); + mutex_unlock(&dsa2_mutex); + + return err; +} +EXPORT_SYMBOL_GPL(dsa_register_switch); + +static void dsa_switch_remove(struct dsa_switch *ds) +{ + struct dsa_switch_tree *dst = ds->dst; + + dsa_tree_teardown(dst); + dsa_switch_release_ports(ds); + dsa_tree_put(dst); +} + +void dsa_unregister_switch(struct dsa_switch *ds) +{ + mutex_lock(&dsa2_mutex); + dsa_switch_remove(ds); + mutex_unlock(&dsa2_mutex); +} +EXPORT_SYMBOL_GPL(dsa_unregister_switch); |