| // 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); |
| |
| /* Track the bridges with forwarding offload enabled */ |
| static unsigned long dsa_fwd_offloading_bridges; |
| |
| /** |
| * dsa_tree_notify - Execute code for all switches in a DSA switch tree. |
| * @dst: collection of struct dsa_switch devices to notify. |
| * @e: event, must be of type DSA_NOTIFIER_* |
| * @v: event-specific value. |
| * |
| * Given a struct dsa_switch_tree, this can be used to run a function once for |
| * each member DSA switch. The other alternative of traversing the tree is only |
| * through its ports list, which does not uniquely list the switches. |
| */ |
| int dsa_tree_notify(struct dsa_switch_tree *dst, unsigned long e, void *v) |
| { |
| struct raw_notifier_head *nh = &dst->nh; |
| int err; |
| |
| err = raw_notifier_call_chain(nh, e, v); |
| |
| return notifier_to_errno(err); |
| } |
| |
| /** |
| * dsa_broadcast - Notify all DSA trees in the system. |
| * @e: event, must be of type DSA_NOTIFIER_* |
| * @v: event-specific value. |
| * |
| * Can be used to notify the switching fabric of events such as cross-chip |
| * bridging between disjoint trees (such as islands of tagger-compatible |
| * switches bridged by an incompatible middle switch). |
| * |
| * WARNING: this function is not reliable during probe time, because probing |
| * between trees is asynchronous and not all DSA trees might have probed. |
| */ |
| int dsa_broadcast(unsigned long e, void *v) |
| { |
| struct dsa_switch_tree *dst; |
| int err = 0; |
| |
| list_for_each_entry(dst, &dsa_tree_list, list) { |
| err = dsa_tree_notify(dst, e, v); |
| if (err) |
| break; |
| } |
| |
| return err; |
| } |
| |
| /** |
| * dsa_lag_map() - Map LAG netdev to a linear LAG ID |
| * @dst: Tree in which to record the mapping. |
| * @lag: Netdev that is to be mapped to an ID. |
| * |
| * dsa_lag_id/dsa_lag_dev can then be used to translate between the |
| * two spaces. The size of the mapping space is determined by the |
| * driver by setting ds->num_lag_ids. It is perfectly legal to leave |
| * it unset if it is not needed, in which case these functions become |
| * no-ops. |
| */ |
| void dsa_lag_map(struct dsa_switch_tree *dst, struct net_device *lag) |
| { |
| unsigned int id; |
| |
| if (dsa_lag_id(dst, lag) >= 0) |
| /* Already mapped */ |
| return; |
| |
| for (id = 0; id < dst->lags_len; id++) { |
| if (!dsa_lag_dev(dst, id)) { |
| dst->lags[id] = lag; |
| return; |
| } |
| } |
| |
| /* No IDs left, which is OK. Some drivers do not need it. The |
| * ones that do, e.g. mv88e6xxx, will discover that dsa_lag_id |
| * returns an error for this device when joining the LAG. The |
| * driver can then return -EOPNOTSUPP back to DSA, which will |
| * fall back to a software LAG. |
| */ |
| } |
| |
| /** |
| * dsa_lag_unmap() - Remove a LAG ID mapping |
| * @dst: Tree in which the mapping is recorded. |
| * @lag: Netdev that was mapped. |
| * |
| * As there may be multiple users of the mapping, it is only removed |
| * if there are no other references to it. |
| */ |
| void dsa_lag_unmap(struct dsa_switch_tree *dst, struct net_device *lag) |
| { |
| struct dsa_port *dp; |
| unsigned int id; |
| |
| dsa_lag_foreach_port(dp, dst, lag) |
| /* There are remaining users of this mapping */ |
| return; |
| |
| dsa_lags_foreach_id(id, dst) { |
| if (dsa_lag_dev(dst, id) == lag) { |
| dst->lags[id] = NULL; |
| break; |
| } |
| } |
| } |
| |
| struct dsa_bridge *dsa_tree_bridge_find(struct dsa_switch_tree *dst, |
| const struct net_device *br) |
| { |
| struct dsa_port *dp; |
| |
| list_for_each_entry(dp, &dst->ports, list) |
| if (dsa_port_bridge_dev_get(dp) == br) |
| return dp->bridge; |
| |
| return NULL; |
| } |
| |
| static int dsa_bridge_num_find(const struct net_device *bridge_dev) |
| { |
| struct dsa_switch_tree *dst; |
| |
| list_for_each_entry(dst, &dsa_tree_list, list) { |
| struct dsa_bridge *bridge; |
| |
| bridge = dsa_tree_bridge_find(dst, bridge_dev); |
| if (bridge) |
| return bridge->num; |
| } |
| |
| return 0; |
| } |
| |
| unsigned int dsa_bridge_num_get(const struct net_device *bridge_dev, int max) |
| { |
| unsigned int bridge_num = dsa_bridge_num_find(bridge_dev); |
| |
| /* Switches without FDB isolation support don't get unique |
| * bridge numbering |
| */ |
| if (!max) |
| return 0; |
| |
| if (!bridge_num) { |
| /* First port that requests FDB isolation or TX forwarding |
| * offload for this bridge |
| */ |
| bridge_num = find_next_zero_bit(&dsa_fwd_offloading_bridges, |
| DSA_MAX_NUM_OFFLOADING_BRIDGES, |
| 1); |
| if (bridge_num >= max) |
| return 0; |
| |
| set_bit(bridge_num, &dsa_fwd_offloading_bridges); |
| } |
| |
| return bridge_num; |
| } |
| |
| void dsa_bridge_num_put(const struct net_device *bridge_dev, |
| unsigned int bridge_num) |
| { |
| /* Since we refcount bridges, we know that when we call this function |
| * it is no longer in use, so we can just go ahead and remove it from |
| * the bit mask. |
| */ |
| clear_bit(bridge_num, &dsa_fwd_offloading_bridges); |
| } |
| |
| 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) |
| { |
| if (dst->tag_ops) |
| dsa_tag_driver_put(dst->tag_ops); |
| 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 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; |
| } |
| |
| /* Assign the default CPU port (the first one in the tree) to all ports of the |
| * fabric which don't already have one as part of their own switch. |
| */ |
| 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; |
| } |
| |
| list_for_each_entry(dp, &dst->ports, list) { |
| if (dp->cpu_dp) |
| continue; |
| |
| if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp)) |
| dp->cpu_dp = cpu_dp; |
| } |
| |
| return 0; |
| } |
| |
| /* Perform initial assignment of CPU ports to user ports and DSA links in the |
| * fabric, giving preference to CPU ports local to each switch. Default to |
| * using the first CPU port in the switch tree if the port does not have a CPU |
| * port local to this switch. |
| */ |
| static int dsa_tree_setup_cpu_ports(struct dsa_switch_tree *dst) |
| { |
| struct dsa_port *cpu_dp, *dp; |
| |
| list_for_each_entry(cpu_dp, &dst->ports, list) { |
| if (!dsa_port_is_cpu(cpu_dp)) |
| 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; |
| |
| if (dsa_port_is_user(dp) || dsa_port_is_dsa(dp)) |
| dp->cpu_dp = cpu_dp; |
| } |
| } |
| |
| return dsa_tree_setup_default_cpu(dst); |
| } |
| |
| static void dsa_tree_teardown_cpu_ports(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; |
| 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); |
| 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: |
| of_get_mac_address(dp->dn, dp->mac); |
| 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) { |
| if (ds->ops->port_teardown) |
| ds->ops->port_teardown(ds, dp->index); |
| 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; |
| 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) { |
| case DSA_PORT_TYPE_UNUSED: |
| break; |
| case DSA_PORT_TYPE_CPU: |
| dsa_port_disable(dp); |
| 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; |
| } |
| |
| list_for_each_entry_safe(a, tmp, &dp->fdbs, list) { |
| list_del(&a->list); |
| kfree(a); |
| } |
| |
| list_for_each_entry_safe(a, tmp, &dp->mdbs, list) { |
| list_del(&a->list); |
| kfree(a); |
| } |
| |
| 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; |
| } |
| |
| /* 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) |
| { |
| 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 int dsa_devlink_sb_pool_get(struct devlink *dl, |
| unsigned int sb_index, u16 pool_index, |
| struct devlink_sb_pool_info *pool_info) |
| { |
| struct dsa_switch *ds = dsa_devlink_to_ds(dl); |
| |
| if (!ds->ops->devlink_sb_pool_get) |
| return -EOPNOTSUPP; |
| |
| return ds->ops->devlink_sb_pool_get(ds, sb_index, pool_index, |
| pool_info); |
| } |
| |
| static int dsa_devlink_sb_pool_set(struct devlink *dl, unsigned int sb_index, |
| u16 pool_index, u32 size, |
| enum devlink_sb_threshold_type threshold_type, |
| struct netlink_ext_ack *extack) |
| { |
| struct dsa_switch *ds = dsa_devlink_to_ds(dl); |
| |
| if (!ds->ops->devlink_sb_pool_set) |
| return -EOPNOTSUPP; |
| |
| return ds->ops->devlink_sb_pool_set(ds, sb_index, pool_index, size, |
| threshold_type, extack); |
| } |
| |
| static int dsa_devlink_sb_port_pool_get(struct devlink_port *dlp, |
| unsigned int sb_index, u16 pool_index, |
| u32 *p_threshold) |
| { |
| struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp); |
| int port = dsa_devlink_port_to_port(dlp); |
| |
| if (!ds->ops->devlink_sb_port_pool_get) |
| return -EOPNOTSUPP; |
| |
| return ds->ops->devlink_sb_port_pool_get(ds, port, sb_index, |
| pool_index, p_threshold); |
| } |
| |
| static int dsa_devlink_sb_port_pool_set(struct devlink_port *dlp, |
| unsigned int sb_index, u16 pool_index, |
| u32 threshold, |
| struct netlink_ext_ack *extack) |
| { |
| struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp); |
| int port = dsa_devlink_port_to_port(dlp); |
| |
| if (!ds->ops->devlink_sb_port_pool_set) |
| return -EOPNOTSUPP; |
| |
| return ds->ops->devlink_sb_port_pool_set(ds, port, sb_index, |
| pool_index, threshold, extack); |
| } |
| |
| static int |
| dsa_devlink_sb_tc_pool_bind_get(struct devlink_port *dlp, |
| unsigned int sb_index, u16 tc_index, |
| enum devlink_sb_pool_type pool_type, |
| u16 *p_pool_index, u32 *p_threshold) |
| { |
| struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp); |
| int port = dsa_devlink_port_to_port(dlp); |
| |
| if (!ds->ops->devlink_sb_tc_pool_bind_get) |
| return -EOPNOTSUPP; |
| |
| return ds->ops->devlink_sb_tc_pool_bind_get(ds, port, sb_index, |
| tc_index, pool_type, |
| p_pool_index, p_threshold); |
| } |
| |
| static int |
| dsa_devlink_sb_tc_pool_bind_set(struct devlink_port *dlp, |
| unsigned int sb_index, u16 tc_index, |
| enum devlink_sb_pool_type pool_type, |
| u16 pool_index, u32 threshold, |
| struct netlink_ext_ack *extack) |
| { |
| struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp); |
| int port = dsa_devlink_port_to_port(dlp); |
| |
| if (!ds->ops->devlink_sb_tc_pool_bind_set) |
| return -EOPNOTSUPP; |
| |
| return ds->ops->devlink_sb_tc_pool_bind_set(ds, port, sb_index, |
| tc_index, pool_type, |
| pool_index, threshold, |
| extack); |
| } |
| |
| static int dsa_devlink_sb_occ_snapshot(struct devlink *dl, |
| unsigned int sb_index) |
| { |
| struct dsa_switch *ds = dsa_devlink_to_ds(dl); |
| |
| if (!ds->ops->devlink_sb_occ_snapshot) |
| return -EOPNOTSUPP; |
| |
| return ds->ops->devlink_sb_occ_snapshot(ds, sb_index); |
| } |
| |
| static int dsa_devlink_sb_occ_max_clear(struct devlink *dl, |
| unsigned int sb_index) |
| { |
| struct dsa_switch *ds = dsa_devlink_to_ds(dl); |
| |
| if (!ds->ops->devlink_sb_occ_max_clear) |
| return -EOPNOTSUPP; |
| |
| return ds->ops->devlink_sb_occ_max_clear(ds, sb_index); |
| } |
| |
| static int dsa_devlink_sb_occ_port_pool_get(struct devlink_port *dlp, |
| unsigned int sb_index, |
| u16 pool_index, u32 *p_cur, |
| u32 *p_max) |
| { |
| struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp); |
| int port = dsa_devlink_port_to_port(dlp); |
| |
| if (!ds->ops->devlink_sb_occ_port_pool_get) |
| return -EOPNOTSUPP; |
| |
| return ds->ops->devlink_sb_occ_port_pool_get(ds, port, sb_index, |
| pool_index, p_cur, p_max); |
| } |
| |
| static int |
| dsa_devlink_sb_occ_tc_port_bind_get(struct devlink_port *dlp, |
| unsigned int sb_index, u16 tc_index, |
| enum devlink_sb_pool_type pool_type, |
| u32 *p_cur, u32 *p_max) |
| { |
| struct dsa_switch *ds = dsa_devlink_port_to_ds(dlp); |
| int port = dsa_devlink_port_to_port(dlp); |
| |
| if (!ds->ops->devlink_sb_occ_tc_port_bind_get) |
| return -EOPNOTSUPP; |
| |
| return ds->ops->devlink_sb_occ_tc_port_bind_get(ds, port, |
| sb_index, tc_index, |
| pool_type, p_cur, |
| p_max); |
| } |
| |
| static const struct devlink_ops dsa_devlink_ops = { |
| .info_get = dsa_devlink_info_get, |
| .sb_pool_get = dsa_devlink_sb_pool_get, |
| .sb_pool_set = dsa_devlink_sb_pool_set, |
| .sb_port_pool_get = dsa_devlink_sb_port_pool_get, |
| .sb_port_pool_set = dsa_devlink_sb_port_pool_set, |
| .sb_tc_pool_bind_get = dsa_devlink_sb_tc_pool_bind_get, |
| .sb_tc_pool_bind_set = dsa_devlink_sb_tc_pool_bind_set, |
| .sb_occ_snapshot = dsa_devlink_sb_occ_snapshot, |
| .sb_occ_max_clear = dsa_devlink_sb_occ_max_clear, |
| .sb_occ_port_pool_get = dsa_devlink_sb_occ_port_pool_get, |
| .sb_occ_tc_port_bind_get = dsa_devlink_sb_occ_tc_port_bind_get, |
| }; |
| |
| 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; |
| struct dsa_port *cpu_dp; |
| int err; |
| |
| if (tag_ops->proto == dst->default_proto) |
| goto connect; |
| |
| 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)); |
| return err; |
| } |
| } |
| |
| connect: |
| if (tag_ops->connect) { |
| err = tag_ops->connect(ds); |
| if (err) |
| return err; |
| } |
| |
| if (ds->ops->connect_tag_protocol) { |
| err = ds->ops->connect_tag_protocol(ds, tag_ops->proto); |
| if (err) { |
| dev_err(ds->dev, |
| "Unable to connect to tag protocol \"%s\": %pe\n", |
| tag_ops->name, ERR_PTR(err)); |
| goto disconnect; |
| } |
| } |
| |
| return 0; |
| |
| disconnect: |
| if (tag_ops->disconnect) |
| tag_ops->disconnect(ds); |
| |
| return err; |
| } |
| |
| 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), ds->dev); |
| if (!ds->devlink) |
| return -ENOMEM; |
| dl_priv = devlink_priv(ds->devlink); |
| dl_priv->ds = ds; |
| |
| /* Setup devlink port instances now, so that the switch |
| * setup() can register regions etc, against the 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); |
| if (err) |
| goto unregister_devlink_ports; |
| |
| ds->configure_vlan_while_not_filtering = true; |
| |
| err = ds->ops->setup(ds); |
| if (err < 0) |
| goto unregister_notifier; |
| |
| err = dsa_switch_setup_tag_protocol(ds); |
| if (err) |
| goto teardown; |
| |
| 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; |
| 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: |
| dsa_switch_for_each_port(dp, ds) |
| dsa_port_devlink_teardown(dp); |
| 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->devlink) |
| devlink_unregister(ds->devlink); |
| |
| 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) { |
| dsa_switch_for_each_port(dp, ds) |
| dsa_port_devlink_teardown(dp); |
| devlink_free(ds->devlink); |
| ds->devlink = NULL; |
| } |
| |
| ds->setup = false; |
| } |
| |
| /* First tear down the non-shared, then the shared ports. This ensures that |
| * all work items scheduled by our switchdev handlers for user ports have |
| * completed before we destroy the refcounting kept on the shared ports. |
| */ |
| static void dsa_tree_teardown_ports(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_unused(dp)) |
| dsa_port_teardown(dp); |
| |
| dsa_flush_workqueue(); |
| |
| list_for_each_entry(dp, &dst->ports, list) |
| if (dsa_port_is_dsa(dp) || dsa_port_is_cpu(dp)) |
| dsa_port_teardown(dp); |
| } |
| |
| static void dsa_tree_teardown_switches(struct dsa_switch_tree *dst) |
| { |
| struct dsa_port *dp; |
| |
| list_for_each_entry(dp, &dst->ports, list) |
| dsa_switch_teardown(dp->ds); |
| } |
| |
| 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) { |
| err = dsa_port_reinit_as_unused(dp); |
| if (err) |
| goto teardown; |
| } |
| } |
| |
| return 0; |
| |
| teardown: |
| dsa_tree_teardown_ports(dst); |
| |
| dsa_tree_teardown_switches(dst); |
| |
| return err; |
| } |
| |
| 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_lags(struct dsa_switch_tree *dst) |
| { |
| unsigned int len = 0; |
| struct dsa_port *dp; |
| |
| list_for_each_entry(dp, &dst->ports, list) { |
| if (dp->ds->num_lag_ids > len) |
| len = dp->ds->num_lag_ids; |
| } |
| |
| if (!len) |
| return 0; |
| |
| dst->lags = kcalloc(len, sizeof(*dst->lags), GFP_KERNEL); |
| if (!dst->lags) |
| return -ENOMEM; |
| |
| dst->lags_len = len; |
| return 0; |
| } |
| |
| static void dsa_tree_teardown_lags(struct dsa_switch_tree *dst) |
| { |
| kfree(dst->lags); |
| } |
| |
| 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_cpu_ports(dst); |
| if (err) |
| return err; |
| |
| err = dsa_tree_setup_switches(dst); |
| if (err) |
| goto teardown_cpu_ports; |
| |
| err = dsa_tree_setup_master(dst); |
| if (err) |
| goto teardown_switches; |
| |
| err = dsa_tree_setup_lags(dst); |
| if (err) |
| goto teardown_master; |
| |
| dst->setup = true; |
| |
| pr_info("DSA: tree %d setup\n", dst->index); |
| |
| return 0; |
| |
| 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); |
| |
| return err; |
| } |
| |
| static void dsa_tree_teardown(struct dsa_switch_tree *dst) |
| { |
| struct dsa_link *dl, *next; |
| |
| if (!dst->setup) |
| return; |
| |
| dsa_tree_teardown_lags(dst); |
| |
| dsa_tree_teardown_master(dst); |
| |
| dsa_tree_teardown_ports(dst); |
| |
| dsa_tree_teardown_switches(dst); |
| |
| dsa_tree_teardown_cpu_ports(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 int dsa_tree_bind_tag_proto(struct dsa_switch_tree *dst, |
| const struct dsa_device_ops *tag_ops) |
| { |
| const struct dsa_device_ops *old_tag_ops = dst->tag_ops; |
| struct dsa_notifier_tag_proto_info info; |
| int err; |
| |
| dst->tag_ops = tag_ops; |
| |
| /* Notify the switches from this tree about the connection |
| * to the new tagger |
| */ |
| info.tag_ops = tag_ops; |
| err = dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_CONNECT, &info); |
| if (err && err != -EOPNOTSUPP) |
| goto out_disconnect; |
| |
| /* Notify the old tagger about the disconnection from this tree */ |
| info.tag_ops = old_tag_ops; |
| dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_DISCONNECT, &info); |
| |
| return 0; |
| |
| out_disconnect: |
| info.tag_ops = tag_ops; |
| dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO_DISCONNECT, &info); |
| dst->tag_ops = old_tag_ops; |
| |
| return err; |
| } |
| |
| /* Since the dsa/tagging sysfs device attribute is per master, the assumption |
| * is that all DSA switches within a tree share the same tagger, otherwise |
| * they would have formed disjoint trees (different "dsa,member" values). |
| */ |
| int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst, |
| struct net_device *master, |
| const struct dsa_device_ops *tag_ops, |
| const struct dsa_device_ops *old_tag_ops) |
| { |
| struct dsa_notifier_tag_proto_info info; |
| struct dsa_port *dp; |
| int err = -EBUSY; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| |
| /* At the moment we don't allow changing the tag protocol under |
| * traffic. The rtnl_mutex also happens to serialize concurrent |
| * attempts to change the tagging protocol. If we ever lift the IFF_UP |
| * restriction, there needs to be another mutex which serializes this. |
| */ |
| if (master->flags & IFF_UP) |
| goto out_unlock; |
| |
| list_for_each_entry(dp, &dst->ports, list) { |
| if (!dsa_port_is_user(dp)) |
| continue; |
| |
| if (dp->slave->flags & IFF_UP) |
| goto out_unlock; |
| } |
| |
| /* Notify the tag protocol change */ |
| info.tag_ops = tag_ops; |
| err = dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO, &info); |
| if (err) |
| return err; |
| |
| err = dsa_tree_bind_tag_proto(dst, tag_ops); |
| if (err) |
| goto out_unwind_tagger; |
| |
| rtnl_unlock(); |
| |
| return 0; |
| |
| out_unwind_tagger: |
| info.tag_ops = old_tag_ops; |
| dsa_tree_notify(dst, DSA_NOTIFIER_TAG_PROTO, &info); |
| out_unlock: |
| rtnl_unlock(); |
| return err; |
| } |
| |
| static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index) |
| { |
| struct dsa_switch_tree *dst = ds->dst; |
| struct dsa_port *dp; |
| |
| dsa_switch_for_each_port(dp, ds) |
| if (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, |
| const char *user_protocol) |
| { |
| struct dsa_switch *ds = dp->ds; |
| struct dsa_switch_tree *dst = ds->dst; |
| const struct dsa_device_ops *tag_ops; |
| enum dsa_tag_protocol default_proto; |
| |
| /* Find out which protocol the switch would prefer. */ |
| default_proto = dsa_get_tag_protocol(dp, master); |
| if (dst->default_proto) { |
| if (dst->default_proto != default_proto) { |
| dev_err(ds->dev, |
| "A DSA switch tree can have only one tagging protocol\n"); |
| return -EINVAL; |
| } |
| } else { |
| dst->default_proto = default_proto; |
| } |
| |
| /* See if the user wants to override that preference. */ |
| if (user_protocol) { |
| if (!ds->ops->change_tag_protocol) { |
| dev_err(ds->dev, "Tag protocol cannot be modified\n"); |
| return -EINVAL; |
| } |
| |
| tag_ops = dsa_find_tagger_by_name(user_protocol); |
| } else { |
| tag_ops = dsa_tag_driver_get(default_proto); |
| } |
| |
| if (IS_ERR(tag_ops)) { |
| if (PTR_ERR(tag_ops) == -ENOPROTOOPT) |
| return -EPROBE_DEFER; |
| |
| dev_warn(ds->dev, "No tagger for this switch\n"); |
| return PTR_ERR(tag_ops); |
| } |
| |
| if (dst->tag_ops) { |
| if (dst->tag_ops != tag_ops) { |
| dev_err(ds->dev, |
| "A DSA switch tree can have only one tagging protocol\n"); |
| |
| dsa_tag_driver_put(tag_ops); |
| return -EINVAL; |
| } |
| |
| /* In the case of multiple CPU ports per switch, the tagging |
| * protocol is still reference-counted only per switch tree. |
| */ |
| dsa_tag_driver_put(tag_ops); |
| } else { |
| dst->tag_ops = tag_ops; |
| } |
| |
| dp->master = master; |
| dp->type = DSA_PORT_TYPE_CPU; |
| dsa_port_set_tag_protocol(dp, dst->tag_ops); |
| dp->dst = dst; |
| |
| /* At this point, the tree may be configured to use a different |
| * tagger than the one chosen by the switch driver during |
| * .setup, in the case when a user selects a custom protocol |
| * through the DT. |
| * |
| * This is resolved by syncing the driver with the tree in |
| * dsa_switch_setup_tag_protocol once .setup has run and the |
| * driver is ready to accept calls to .change_tag_protocol. If |
| * the driver does not support the custom protocol at that |
| * point, the tree is wholly rejected, thereby ensuring that the |
| * tree and driver are always in agreement on the protocol to |
| * use. |
| */ |
| 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; |
| const char *user_protocol; |
| |
| master = of_find_net_device_by_node(ethernet); |
| if (!master) |
| return -EPROBE_DEFER; |
| |
| user_protocol = of_get_property(dn, "dsa-tag-protocol", NULL); |
| return dsa_port_parse_cpu(dp, master, user_protocol); |
| } |
| |
| 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) { |
| 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; |
| } |
| |
| dp = dsa_to_port(ds, reg); |
| |
| err = dsa_port_parse_of(dp, port); |
| if (err) { |
| of_node_put(port); |
| 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; |
| |
| if (dsa_switch_find(ds->dst->index, ds->index)) { |
| dev_err(ds->dev, |
| "A DSA switch with index %d already exists in tree %d\n", |
| ds->index, ds->dst->index); |
| return -EEXIST; |
| } |
| |
| if (ds->dst->last_switch < ds->index) |
| ds->dst->last_switch = ds->index; |
| |
| 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, NULL); |
| } |
| |
| 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_port *dp, *next; |
| |
| dsa_switch_for_each_port_safe(dp, next, ds) { |
| 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); |
| |
| /* 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); |