diff options
Diffstat (limited to 'drivers/net/dsa/dsa_loop.c')
-rw-r--r-- | drivers/net/dsa/dsa_loop.c | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/drivers/net/dsa/dsa_loop.c b/drivers/net/dsa/dsa_loop.c new file mode 100644 index 000000000..fbeb99ab9 --- /dev/null +++ b/drivers/net/dsa/dsa_loop.c @@ -0,0 +1,420 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Distributed Switch Architecture loopback driver + * + * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com> + */ + +#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 net_device *bridge) +{ + dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n", + __func__, port, bridge->name); + + return 0; +} + +static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port, + struct net_device *bridge) +{ + dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n", + __func__, port, bridge->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 switchdev_trans *trans) +{ + dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n", + __func__, port, vlan_filtering); + + return 0; +} + +static int +dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port, + const struct switchdev_obj_port_vlan *vlan) +{ + struct dsa_loop_priv *ps = ds->priv; + struct mii_bus *bus = ps->bus; + + dev_dbg(ds->dev, "%s: port: %d, vlan: %d-%d", + __func__, port, vlan->vid_begin, vlan->vid_end); + + /* Just do a sleeping operation to make lockdep checks effective */ + mdiobus_read(bus, ps->port_base + port, MII_BMSR); + + if (vlan->vid_end > ARRAY_SIZE(ps->vlans)) + return -ERANGE; + + return 0; +} + +static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port, + const struct switchdev_obj_port_vlan *vlan) +{ + 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; + u16 vid; + + /* Just do a sleeping operation to make lockdep checks effective */ + mdiobus_read(bus, ps->port_base + port, MII_BMSR); + + for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { + vl = &ps->vlans[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, vid, untagged ? "un" : "", pvid); + } + + if (pvid) + ps->ports[port].pvid = vid; +} + +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; + struct mii_bus *bus = ps->bus; + struct dsa_loop_vlan *vl; + u16 vid, pvid = ps->ports[port].pvid; + + /* Just do a sleeping operation to make lockdep checks effective */ + mdiobus_read(bus, ps->port_base + port, MII_BMSR); + + for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { + vl = &ps->vlans[vid]; + + vl->members &= ~BIT(port); + if (untagged) + vl->untagged &= ~BIT(port); + + if (pvid == vid) + pvid = 1; + + dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", + __func__, port, 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_prepare = dsa_loop_port_vlan_prepare, + .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; + ds->configure_vlan_while_not_filtering = true; + 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 = ds->priv; + + dsa_unregister_switch(ds); + dev_put(ps->netdev); +} + +static struct mdio_driver dsa_loop_drv = { + .mdiodrv.driver = { + .name = "dsa-loop", + }, + .probe = dsa_loop_drv_probe, + .remove = dsa_loop_drv_remove, +}; + +#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"); |