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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Handling of a single switch port
- *
- * Copyright (c) 2017 Savoir-faire Linux Inc.
- * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
- */
- #include <linux/if_bridge.h>
- #include <linux/notifier.h>
- #include <linux/of_mdio.h>
- #include <linux/of_net.h>
- #include "dsa_priv.h"
- static 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) {
- struct raw_notifier_head *nh = &dst->nh;
- err = raw_notifier_call_chain(nh, e, v);
- err = notifier_to_errno(err);
- if (err)
- break;
- }
- return err;
- }
- static int dsa_port_notify(const struct dsa_port *dp, unsigned long e, void *v)
- {
- struct raw_notifier_head *nh = &dp->ds->dst->nh;
- int err;
- err = raw_notifier_call_chain(nh, e, v);
- return notifier_to_errno(err);
- }
- int dsa_port_set_state(struct dsa_port *dp, u8 state,
- struct switchdev_trans *trans)
- {
- struct dsa_switch *ds = dp->ds;
- int port = dp->index;
- if (switchdev_trans_ph_prepare(trans))
- return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP;
- if (ds->ops->port_stp_state_set)
- ds->ops->port_stp_state_set(ds, port, state);
- if (ds->ops->port_fast_age) {
- /* Fast age FDB entries or flush appropriate forwarding database
- * for the given port, if we are moving it from Learning or
- * Forwarding state, to Disabled or Blocking or Listening state.
- */
- if ((dp->stp_state == BR_STATE_LEARNING ||
- dp->stp_state == BR_STATE_FORWARDING) &&
- (state == BR_STATE_DISABLED ||
- state == BR_STATE_BLOCKING ||
- state == BR_STATE_LISTENING))
- ds->ops->port_fast_age(ds, port);
- }
- dp->stp_state = state;
- return 0;
- }
- static void dsa_port_set_state_now(struct dsa_port *dp, u8 state)
- {
- int err;
- err = dsa_port_set_state(dp, state, NULL);
- if (err)
- pr_err("DSA: failed to set STP state %u (%d)\n", state, err);
- }
- int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy)
- {
- struct dsa_switch *ds = dp->ds;
- int port = dp->index;
- int err;
- if (ds->ops->port_enable) {
- err = ds->ops->port_enable(ds, port, phy);
- if (err)
- return err;
- }
- if (!dp->bridge_dev)
- dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
- if (dp->pl)
- phylink_start(dp->pl);
- return 0;
- }
- int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy)
- {
- int err;
- rtnl_lock();
- err = dsa_port_enable_rt(dp, phy);
- rtnl_unlock();
- return err;
- }
- void dsa_port_disable_rt(struct dsa_port *dp)
- {
- struct dsa_switch *ds = dp->ds;
- int port = dp->index;
- if (dp->pl)
- phylink_stop(dp->pl);
- if (!dp->bridge_dev)
- dsa_port_set_state_now(dp, BR_STATE_DISABLED);
- if (ds->ops->port_disable)
- ds->ops->port_disable(ds, port);
- }
- void dsa_port_disable(struct dsa_port *dp)
- {
- rtnl_lock();
- dsa_port_disable_rt(dp);
- rtnl_unlock();
- }
- int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br)
- {
- struct dsa_notifier_bridge_info info = {
- .tree_index = dp->ds->dst->index,
- .sw_index = dp->ds->index,
- .port = dp->index,
- .br = br,
- };
- int err;
- /* Set the flooding mode before joining the port in the switch */
- err = dsa_port_bridge_flags(dp, BR_FLOOD | BR_MCAST_FLOOD, NULL);
- if (err)
- return err;
- /* Here the interface is already bridged. Reflect the current
- * configuration so that drivers can program their chips accordingly.
- */
- dp->bridge_dev = br;
- err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_JOIN, &info);
- /* The bridging is rolled back on error */
- if (err) {
- dsa_port_bridge_flags(dp, 0, NULL);
- dp->bridge_dev = NULL;
- }
- return err;
- }
- void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br)
- {
- struct dsa_notifier_bridge_info info = {
- .tree_index = dp->ds->dst->index,
- .sw_index = dp->ds->index,
- .port = dp->index,
- .br = br,
- };
- int err;
- /* Here the port is already unbridged. Reflect the current configuration
- * so that drivers can program their chips accordingly.
- */
- dp->bridge_dev = NULL;
- err = dsa_broadcast(DSA_NOTIFIER_BRIDGE_LEAVE, &info);
- if (err)
- pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n");
- /* Port is leaving the bridge, disable flooding */
- dsa_port_bridge_flags(dp, 0, NULL);
- /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
- * so allow it to be in BR_STATE_FORWARDING to be kept functional
- */
- dsa_port_set_state_now(dp, BR_STATE_FORWARDING);
- }
- /* Must be called under rcu_read_lock() */
- static bool dsa_port_can_apply_vlan_filtering(struct dsa_port *dp,
- bool vlan_filtering)
- {
- struct dsa_switch *ds = dp->ds;
- int err, i;
- /* VLAN awareness was off, so the question is "can we turn it on".
- * We may have had 8021q uppers, those need to go. Make sure we don't
- * enter an inconsistent state: deny changing the VLAN awareness state
- * as long as we have 8021q uppers.
- */
- if (vlan_filtering && dsa_is_user_port(ds, dp->index)) {
- struct net_device *upper_dev, *slave = dp->slave;
- struct net_device *br = dp->bridge_dev;
- struct list_head *iter;
- netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
- struct bridge_vlan_info br_info;
- u16 vid;
- if (!is_vlan_dev(upper_dev))
- continue;
- vid = vlan_dev_vlan_id(upper_dev);
- /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
- * device, respectively the VID is not found, returning
- * 0 means success, which is a failure for us here.
- */
- err = br_vlan_get_info(br, vid, &br_info);
- if (err == 0) {
- dev_err(ds->dev, "Must remove upper %s first\n",
- upper_dev->name);
- return false;
- }
- }
- }
- if (!ds->vlan_filtering_is_global)
- return true;
- /* For cases where enabling/disabling VLAN awareness is global to the
- * switch, we need to handle the case where multiple bridges span
- * different ports of the same switch device and one of them has a
- * different setting than what is being requested.
- */
- for (i = 0; i < ds->num_ports; i++) {
- struct net_device *other_bridge;
- other_bridge = dsa_to_port(ds, i)->bridge_dev;
- if (!other_bridge)
- continue;
- /* If it's the same bridge, it also has same
- * vlan_filtering setting => no need to check
- */
- if (other_bridge == dp->bridge_dev)
- continue;
- if (br_vlan_enabled(other_bridge) != vlan_filtering) {
- dev_err(ds->dev, "VLAN filtering is a global setting\n");
- return false;
- }
- }
- return true;
- }
- int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
- struct switchdev_trans *trans)
- {
- struct dsa_switch *ds = dp->ds;
- int err;
- if (switchdev_trans_ph_prepare(trans)) {
- bool apply;
- if (!ds->ops->port_vlan_filtering)
- return -EOPNOTSUPP;
- /* We are called from dsa_slave_switchdev_blocking_event(),
- * which is not under rcu_read_lock(), unlike
- * dsa_slave_switchdev_event().
- */
- rcu_read_lock();
- apply = dsa_port_can_apply_vlan_filtering(dp, vlan_filtering);
- rcu_read_unlock();
- if (!apply)
- return -EINVAL;
- }
- if (dsa_port_is_vlan_filtering(dp) == vlan_filtering)
- return 0;
- err = ds->ops->port_vlan_filtering(ds, dp->index, vlan_filtering,
- trans);
- if (err)
- return err;
- if (switchdev_trans_ph_commit(trans)) {
- if (ds->vlan_filtering_is_global)
- ds->vlan_filtering = vlan_filtering;
- else
- dp->vlan_filtering = vlan_filtering;
- }
- return 0;
- }
- /* This enforces legacy behavior for switch drivers which assume they can't
- * receive VLAN configuration when enslaved to a bridge with vlan_filtering=0
- */
- bool dsa_port_skip_vlan_configuration(struct dsa_port *dp)
- {
- struct dsa_switch *ds = dp->ds;
- if (!dp->bridge_dev)
- return false;
- return (!ds->configure_vlan_while_not_filtering &&
- !br_vlan_enabled(dp->bridge_dev));
- }
- int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
- struct switchdev_trans *trans)
- {
- unsigned long ageing_jiffies = clock_t_to_jiffies(ageing_clock);
- unsigned int ageing_time = jiffies_to_msecs(ageing_jiffies);
- struct dsa_notifier_ageing_time_info info = {
- .ageing_time = ageing_time,
- .trans = trans,
- };
- if (switchdev_trans_ph_prepare(trans))
- return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
- dp->ageing_time = ageing_time;
- return dsa_port_notify(dp, DSA_NOTIFIER_AGEING_TIME, &info);
- }
- int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
- struct switchdev_trans *trans)
- {
- struct dsa_switch *ds = dp->ds;
- if (!ds->ops->port_egress_floods ||
- (flags & ~(BR_FLOOD | BR_MCAST_FLOOD)))
- return -EINVAL;
- return 0;
- }
- int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
- struct switchdev_trans *trans)
- {
- struct dsa_switch *ds = dp->ds;
- int port = dp->index;
- int err = 0;
- if (switchdev_trans_ph_prepare(trans))
- return 0;
- if (ds->ops->port_egress_floods)
- err = ds->ops->port_egress_floods(ds, port, flags & BR_FLOOD,
- flags & BR_MCAST_FLOOD);
- return err;
- }
- int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
- struct switchdev_trans *trans)
- {
- struct dsa_switch *ds = dp->ds;
- int port = dp->index;
- if (switchdev_trans_ph_prepare(trans))
- return ds->ops->port_egress_floods ? 0 : -EOPNOTSUPP;
- return ds->ops->port_egress_floods(ds, port, true, mrouter);
- }
- int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu,
- bool propagate_upstream)
- {
- struct dsa_notifier_mtu_info info = {
- .sw_index = dp->ds->index,
- .propagate_upstream = propagate_upstream,
- .port = dp->index,
- .mtu = new_mtu,
- };
- return dsa_port_notify(dp, DSA_NOTIFIER_MTU, &info);
- }
- int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
- u16 vid)
- {
- struct dsa_notifier_fdb_info info = {
- .sw_index = dp->ds->index,
- .port = dp->index,
- .addr = addr,
- .vid = vid,
- };
- return dsa_port_notify(dp, DSA_NOTIFIER_FDB_ADD, &info);
- }
- int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
- u16 vid)
- {
- struct dsa_notifier_fdb_info info = {
- .sw_index = dp->ds->index,
- .port = dp->index,
- .addr = addr,
- .vid = vid,
- };
- return dsa_port_notify(dp, DSA_NOTIFIER_FDB_DEL, &info);
- }
- int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data)
- {
- struct dsa_switch *ds = dp->ds;
- int port = dp->index;
- if (!ds->ops->port_fdb_dump)
- return -EOPNOTSUPP;
- return ds->ops->port_fdb_dump(ds, port, cb, data);
- }
- int dsa_port_mdb_add(const struct dsa_port *dp,
- const struct switchdev_obj_port_mdb *mdb,
- struct switchdev_trans *trans)
- {
- struct dsa_notifier_mdb_info info = {
- .sw_index = dp->ds->index,
- .port = dp->index,
- .trans = trans,
- .mdb = mdb,
- };
- return dsa_port_notify(dp, DSA_NOTIFIER_MDB_ADD, &info);
- }
- int dsa_port_mdb_del(const struct dsa_port *dp,
- const struct switchdev_obj_port_mdb *mdb)
- {
- struct dsa_notifier_mdb_info info = {
- .sw_index = dp->ds->index,
- .port = dp->index,
- .mdb = mdb,
- };
- return dsa_port_notify(dp, DSA_NOTIFIER_MDB_DEL, &info);
- }
- int dsa_port_vlan_add(struct dsa_port *dp,
- const struct switchdev_obj_port_vlan *vlan,
- struct switchdev_trans *trans)
- {
- struct dsa_notifier_vlan_info info = {
- .sw_index = dp->ds->index,
- .port = dp->index,
- .trans = trans,
- .vlan = vlan,
- };
- return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_ADD, &info);
- }
- int dsa_port_vlan_del(struct dsa_port *dp,
- const struct switchdev_obj_port_vlan *vlan)
- {
- struct dsa_notifier_vlan_info info = {
- .sw_index = dp->ds->index,
- .port = dp->index,
- .vlan = vlan,
- };
- return dsa_port_notify(dp, DSA_NOTIFIER_VLAN_DEL, &info);
- }
- static struct phy_device *dsa_port_get_phy_device(struct dsa_port *dp)
- {
- struct device_node *phy_dn;
- struct phy_device *phydev;
- phy_dn = of_parse_phandle(dp->dn, "phy-handle", 0);
- if (!phy_dn)
- return NULL;
- phydev = of_phy_find_device(phy_dn);
- if (!phydev) {
- of_node_put(phy_dn);
- return ERR_PTR(-EPROBE_DEFER);
- }
- of_node_put(phy_dn);
- return phydev;
- }
- static void dsa_port_phylink_validate(struct phylink_config *config,
- unsigned long *supported,
- struct phylink_link_state *state)
- {
- struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
- struct dsa_switch *ds = dp->ds;
- if (!ds->ops->phylink_validate)
- return;
- ds->ops->phylink_validate(ds, dp->index, supported, state);
- }
- static void dsa_port_phylink_mac_pcs_get_state(struct phylink_config *config,
- struct phylink_link_state *state)
- {
- struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
- struct dsa_switch *ds = dp->ds;
- int err;
- /* Only called for inband modes */
- if (!ds->ops->phylink_mac_link_state) {
- state->link = 0;
- return;
- }
- err = ds->ops->phylink_mac_link_state(ds, dp->index, state);
- if (err < 0) {
- dev_err(ds->dev, "p%d: phylink_mac_link_state() failed: %d\n",
- dp->index, err);
- state->link = 0;
- }
- }
- static void dsa_port_phylink_mac_config(struct phylink_config *config,
- unsigned int mode,
- const struct phylink_link_state *state)
- {
- struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
- struct dsa_switch *ds = dp->ds;
- if (!ds->ops->phylink_mac_config)
- return;
- ds->ops->phylink_mac_config(ds, dp->index, mode, state);
- }
- static void dsa_port_phylink_mac_an_restart(struct phylink_config *config)
- {
- struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
- struct dsa_switch *ds = dp->ds;
- if (!ds->ops->phylink_mac_an_restart)
- return;
- ds->ops->phylink_mac_an_restart(ds, dp->index);
- }
- static void dsa_port_phylink_mac_link_down(struct phylink_config *config,
- unsigned int mode,
- phy_interface_t interface)
- {
- struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
- struct phy_device *phydev = NULL;
- struct dsa_switch *ds = dp->ds;
- if (dsa_is_user_port(ds, dp->index))
- phydev = dp->slave->phydev;
- if (!ds->ops->phylink_mac_link_down) {
- if (ds->ops->adjust_link && phydev)
- ds->ops->adjust_link(ds, dp->index, phydev);
- return;
- }
- ds->ops->phylink_mac_link_down(ds, dp->index, mode, interface);
- }
- static void dsa_port_phylink_mac_link_up(struct phylink_config *config,
- struct phy_device *phydev,
- unsigned int mode,
- phy_interface_t interface,
- int speed, int duplex,
- bool tx_pause, bool rx_pause)
- {
- struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
- struct dsa_switch *ds = dp->ds;
- if (!ds->ops->phylink_mac_link_up) {
- if (ds->ops->adjust_link && phydev)
- ds->ops->adjust_link(ds, dp->index, phydev);
- return;
- }
- ds->ops->phylink_mac_link_up(ds, dp->index, mode, interface, phydev,
- speed, duplex, tx_pause, rx_pause);
- }
- const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
- .validate = dsa_port_phylink_validate,
- .mac_pcs_get_state = dsa_port_phylink_mac_pcs_get_state,
- .mac_config = dsa_port_phylink_mac_config,
- .mac_an_restart = dsa_port_phylink_mac_an_restart,
- .mac_link_down = dsa_port_phylink_mac_link_down,
- .mac_link_up = dsa_port_phylink_mac_link_up,
- };
- static int dsa_port_setup_phy_of(struct dsa_port *dp, bool enable)
- {
- struct dsa_switch *ds = dp->ds;
- struct phy_device *phydev;
- int port = dp->index;
- int err = 0;
- phydev = dsa_port_get_phy_device(dp);
- if (!phydev)
- return 0;
- if (IS_ERR(phydev))
- return PTR_ERR(phydev);
- if (enable) {
- err = genphy_resume(phydev);
- if (err < 0)
- goto err_put_dev;
- err = genphy_read_status(phydev);
- if (err < 0)
- goto err_put_dev;
- } else {
- err = genphy_suspend(phydev);
- if (err < 0)
- goto err_put_dev;
- }
- if (ds->ops->adjust_link)
- ds->ops->adjust_link(ds, port, phydev);
- dev_dbg(ds->dev, "enabled port's phy: %s", phydev_name(phydev));
- err_put_dev:
- put_device(&phydev->mdio.dev);
- return err;
- }
- static int dsa_port_fixed_link_register_of(struct dsa_port *dp)
- {
- struct device_node *dn = dp->dn;
- struct dsa_switch *ds = dp->ds;
- struct phy_device *phydev;
- int port = dp->index;
- phy_interface_t mode;
- int err;
- err = of_phy_register_fixed_link(dn);
- if (err) {
- dev_err(ds->dev,
- "failed to register the fixed PHY of port %d\n",
- port);
- return err;
- }
- phydev = of_phy_find_device(dn);
- err = of_get_phy_mode(dn, &mode);
- if (err)
- mode = PHY_INTERFACE_MODE_NA;
- phydev->interface = mode;
- genphy_read_status(phydev);
- if (ds->ops->adjust_link)
- ds->ops->adjust_link(ds, port, phydev);
- put_device(&phydev->mdio.dev);
- return 0;
- }
- static int dsa_port_phylink_register(struct dsa_port *dp)
- {
- struct dsa_switch *ds = dp->ds;
- struct device_node *port_dn = dp->dn;
- phy_interface_t mode;
- int err;
- err = of_get_phy_mode(port_dn, &mode);
- if (err)
- mode = PHY_INTERFACE_MODE_NA;
- dp->pl_config.dev = ds->dev;
- dp->pl_config.type = PHYLINK_DEV;
- dp->pl_config.pcs_poll = ds->pcs_poll;
- dp->pl = phylink_create(&dp->pl_config, of_fwnode_handle(port_dn),
- mode, &dsa_port_phylink_mac_ops);
- if (IS_ERR(dp->pl)) {
- pr_err("error creating PHYLINK: %ld\n", PTR_ERR(dp->pl));
- return PTR_ERR(dp->pl);
- }
- err = phylink_of_phy_connect(dp->pl, port_dn, 0);
- if (err && err != -ENODEV) {
- pr_err("could not attach to PHY: %d\n", err);
- goto err_phy_connect;
- }
- return 0;
- err_phy_connect:
- phylink_destroy(dp->pl);
- return err;
- }
- int dsa_port_link_register_of(struct dsa_port *dp)
- {
- struct dsa_switch *ds = dp->ds;
- struct device_node *phy_np;
- int port = dp->index;
- if (!ds->ops->adjust_link) {
- phy_np = of_parse_phandle(dp->dn, "phy-handle", 0);
- if (of_phy_is_fixed_link(dp->dn) || phy_np) {
- if (ds->ops->phylink_mac_link_down)
- ds->ops->phylink_mac_link_down(ds, port,
- MLO_AN_FIXED, PHY_INTERFACE_MODE_NA);
- return dsa_port_phylink_register(dp);
- }
- return 0;
- }
- dev_warn(ds->dev,
- "Using legacy PHYLIB callbacks. Please migrate to PHYLINK!\n");
- if (of_phy_is_fixed_link(dp->dn))
- return dsa_port_fixed_link_register_of(dp);
- else
- return dsa_port_setup_phy_of(dp, true);
- }
- void dsa_port_link_unregister_of(struct dsa_port *dp)
- {
- struct dsa_switch *ds = dp->ds;
- if (!ds->ops->adjust_link && dp->pl) {
- rtnl_lock();
- phylink_disconnect_phy(dp->pl);
- rtnl_unlock();
- phylink_destroy(dp->pl);
- dp->pl = NULL;
- return;
- }
- if (of_phy_is_fixed_link(dp->dn))
- of_phy_deregister_fixed_link(dp->dn);
- else
- dsa_port_setup_phy_of(dp, false);
- }
- int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data)
- {
- struct phy_device *phydev;
- int ret = -EOPNOTSUPP;
- if (of_phy_is_fixed_link(dp->dn))
- return ret;
- phydev = dsa_port_get_phy_device(dp);
- if (IS_ERR_OR_NULL(phydev))
- return ret;
- ret = phy_ethtool_get_strings(phydev, data);
- put_device(&phydev->mdio.dev);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dsa_port_get_phy_strings);
- int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data)
- {
- struct phy_device *phydev;
- int ret = -EOPNOTSUPP;
- if (of_phy_is_fixed_link(dp->dn))
- return ret;
- phydev = dsa_port_get_phy_device(dp);
- if (IS_ERR_OR_NULL(phydev))
- return ret;
- ret = phy_ethtool_get_stats(phydev, NULL, data);
- put_device(&phydev->mdio.dev);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dsa_port_get_ethtool_phy_stats);
- int dsa_port_get_phy_sset_count(struct dsa_port *dp)
- {
- struct phy_device *phydev;
- int ret = -EOPNOTSUPP;
- if (of_phy_is_fixed_link(dp->dn))
- return ret;
- phydev = dsa_port_get_phy_device(dp);
- if (IS_ERR_OR_NULL(phydev))
- return ret;
- ret = phy_ethtool_get_sset_count(phydev);
- put_device(&phydev->mdio.dev);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dsa_port_get_phy_sset_count);
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