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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Distributed Switch Architecture loopback driver
- *
- * Copyright (C) 2016, Florian Fainelli <[email protected]>
- */
- #include <linux/platform_device.h>
- #include <linux/netdevice.h>
- #include <linux/phy.h>
- #include <linux/phy_fixed.h>
- #include <linux/export.h>
- #include <linux/ethtool.h>
- #include <linux/workqueue.h>
- #include <linux/module.h>
- #include <linux/if_bridge.h>
- #include <linux/dsa/loop.h>
- #include <net/dsa.h>
- #include "dsa_loop.h"
- static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
- [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },
- [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
- [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
- [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
- };
- static struct phy_device *phydevs[PHY_MAX_ADDR];
- enum dsa_loop_devlink_resource_id {
- DSA_LOOP_DEVLINK_PARAM_ID_VTU,
- };
- static u64 dsa_loop_devlink_vtu_get(void *priv)
- {
- struct dsa_loop_priv *ps = priv;
- unsigned int i, count = 0;
- struct dsa_loop_vlan *vl;
- for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {
- vl = &ps->vlans[i];
- if (vl->members)
- count++;
- }
- return count;
- }
- static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)
- {
- struct devlink_resource_size_params size_params;
- struct dsa_loop_priv *ps = ds->priv;
- int err;
- devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),
- ARRAY_SIZE(ps->vlans),
- 1, DEVLINK_RESOURCE_UNIT_ENTRY);
- err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),
- DSA_LOOP_DEVLINK_PARAM_ID_VTU,
- DEVLINK_RESOURCE_ID_PARENT_TOP,
- &size_params);
- if (err)
- goto out;
- dsa_devlink_resource_occ_get_register(ds,
- DSA_LOOP_DEVLINK_PARAM_ID_VTU,
- dsa_loop_devlink_vtu_get, ps);
- return 0;
- out:
- dsa_devlink_resources_unregister(ds);
- return err;
- }
- static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
- int port,
- enum dsa_tag_protocol mp)
- {
- dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
- return DSA_TAG_PROTO_NONE;
- }
- static int dsa_loop_setup(struct dsa_switch *ds)
- {
- struct dsa_loop_priv *ps = ds->priv;
- unsigned int i;
- for (i = 0; i < ds->num_ports; i++)
- memcpy(ps->ports[i].mib, dsa_loop_mibs,
- sizeof(dsa_loop_mibs));
- dev_dbg(ds->dev, "%s\n", __func__);
- return dsa_loop_setup_devlink_resources(ds);
- }
- static void dsa_loop_teardown(struct dsa_switch *ds)
- {
- dsa_devlink_resources_unregister(ds);
- }
- static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
- {
- if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
- return 0;
- return __DSA_LOOP_CNT_MAX;
- }
- static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
- u32 stringset, uint8_t *data)
- {
- struct dsa_loop_priv *ps = ds->priv;
- unsigned int i;
- if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
- return;
- for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
- memcpy(data + i * ETH_GSTRING_LEN,
- ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
- }
- static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
- uint64_t *data)
- {
- struct dsa_loop_priv *ps = ds->priv;
- unsigned int i;
- for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
- data[i] = ps->ports[port].mib[i].val;
- }
- static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
- {
- struct dsa_loop_priv *ps = ds->priv;
- struct mii_bus *bus = ps->bus;
- int ret;
- ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
- if (ret < 0)
- ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
- else
- ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
- return ret;
- }
- static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
- int regnum, u16 value)
- {
- struct dsa_loop_priv *ps = ds->priv;
- struct mii_bus *bus = ps->bus;
- int ret;
- ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
- if (ret < 0)
- ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
- else
- ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
- return ret;
- }
- static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
- struct dsa_bridge bridge,
- bool *tx_fwd_offload,
- struct netlink_ext_ack *extack)
- {
- dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
- __func__, port, bridge.dev->name);
- return 0;
- }
- static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
- struct dsa_bridge bridge)
- {
- dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
- __func__, port, bridge.dev->name);
- }
- static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
- u8 state)
- {
- dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
- __func__, port, state);
- }
- static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
- bool vlan_filtering,
- struct netlink_ext_ack *extack)
- {
- dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
- __func__, port, vlan_filtering);
- return 0;
- }
- static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
- const struct switchdev_obj_port_vlan *vlan,
- struct netlink_ext_ack *extack)
- {
- bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
- bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
- struct dsa_loop_priv *ps = ds->priv;
- struct mii_bus *bus = ps->bus;
- struct dsa_loop_vlan *vl;
- if (vlan->vid >= ARRAY_SIZE(ps->vlans))
- return -ERANGE;
- /* Just do a sleeping operation to make lockdep checks effective */
- mdiobus_read(bus, ps->port_base + port, MII_BMSR);
- vl = &ps->vlans[vlan->vid];
- vl->members |= BIT(port);
- if (untagged)
- vl->untagged |= BIT(port);
- else
- vl->untagged &= ~BIT(port);
- dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
- __func__, port, vlan->vid, untagged ? "un" : "", pvid);
- if (pvid)
- ps->ports[port].pvid = vlan->vid;
- return 0;
- }
- static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
- const struct switchdev_obj_port_vlan *vlan)
- {
- bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
- struct dsa_loop_priv *ps = ds->priv;
- u16 pvid = ps->ports[port].pvid;
- struct mii_bus *bus = ps->bus;
- struct dsa_loop_vlan *vl;
- /* Just do a sleeping operation to make lockdep checks effective */
- mdiobus_read(bus, ps->port_base + port, MII_BMSR);
- vl = &ps->vlans[vlan->vid];
- vl->members &= ~BIT(port);
- if (untagged)
- vl->untagged &= ~BIT(port);
- if (pvid == vlan->vid)
- pvid = 1;
- dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
- __func__, port, vlan->vid, untagged ? "un" : "", pvid);
- ps->ports[port].pvid = pvid;
- return 0;
- }
- static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
- int new_mtu)
- {
- struct dsa_loop_priv *priv = ds->priv;
- priv->ports[port].mtu = new_mtu;
- return 0;
- }
- static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
- {
- return ETH_MAX_MTU;
- }
- static const struct dsa_switch_ops dsa_loop_driver = {
- .get_tag_protocol = dsa_loop_get_protocol,
- .setup = dsa_loop_setup,
- .teardown = dsa_loop_teardown,
- .get_strings = dsa_loop_get_strings,
- .get_ethtool_stats = dsa_loop_get_ethtool_stats,
- .get_sset_count = dsa_loop_get_sset_count,
- .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats,
- .phy_read = dsa_loop_phy_read,
- .phy_write = dsa_loop_phy_write,
- .port_bridge_join = dsa_loop_port_bridge_join,
- .port_bridge_leave = dsa_loop_port_bridge_leave,
- .port_stp_state_set = dsa_loop_port_stp_state_set,
- .port_vlan_filtering = dsa_loop_port_vlan_filtering,
- .port_vlan_add = dsa_loop_port_vlan_add,
- .port_vlan_del = dsa_loop_port_vlan_del,
- .port_change_mtu = dsa_loop_port_change_mtu,
- .port_max_mtu = dsa_loop_port_max_mtu,
- };
- static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
- {
- struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
- struct dsa_loop_priv *ps;
- struct dsa_switch *ds;
- int ret;
- if (!pdata)
- return -ENODEV;
- ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
- if (!ds)
- return -ENOMEM;
- ds->dev = &mdiodev->dev;
- ds->num_ports = DSA_LOOP_NUM_PORTS;
- ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
- if (!ps)
- return -ENOMEM;
- ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
- if (!ps->netdev)
- return -EPROBE_DEFER;
- pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
- ds->dev = &mdiodev->dev;
- ds->ops = &dsa_loop_driver;
- ds->priv = ps;
- ps->bus = mdiodev->bus;
- dev_set_drvdata(&mdiodev->dev, ds);
- ret = dsa_register_switch(ds);
- if (!ret)
- dev_info(&mdiodev->dev, "%s: 0x%0x\n",
- pdata->name, pdata->enabled_ports);
- return ret;
- }
- static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
- {
- struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
- struct dsa_loop_priv *ps;
- if (!ds)
- return;
- ps = ds->priv;
- dsa_unregister_switch(ds);
- dev_put(ps->netdev);
- }
- static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
- {
- struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
- if (!ds)
- return;
- dsa_switch_shutdown(ds);
- dev_set_drvdata(&mdiodev->dev, NULL);
- }
- static struct mdio_driver dsa_loop_drv = {
- .mdiodrv.driver = {
- .name = "dsa-loop",
- },
- .probe = dsa_loop_drv_probe,
- .remove = dsa_loop_drv_remove,
- .shutdown = dsa_loop_drv_shutdown,
- };
- #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)
- static void dsa_loop_phydevs_unregister(void)
- {
- unsigned int i;
- for (i = 0; i < NUM_FIXED_PHYS; i++)
- if (!IS_ERR(phydevs[i])) {
- fixed_phy_unregister(phydevs[i]);
- phy_device_free(phydevs[i]);
- }
- }
- static int __init dsa_loop_init(void)
- {
- struct fixed_phy_status status = {
- .link = 1,
- .speed = SPEED_100,
- .duplex = DUPLEX_FULL,
- };
- unsigned int i, ret;
- for (i = 0; i < NUM_FIXED_PHYS; i++)
- phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
- ret = mdio_driver_register(&dsa_loop_drv);
- if (ret)
- dsa_loop_phydevs_unregister();
- return ret;
- }
- module_init(dsa_loop_init);
- static void __exit dsa_loop_exit(void)
- {
- mdio_driver_unregister(&dsa_loop_drv);
- dsa_loop_phydevs_unregister();
- }
- module_exit(dsa_loop_exit);
- MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Florian Fainelli");
- MODULE_DESCRIPTION("DSA loopback driver");
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