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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Distributed Switch Architecture loopback driver4 *5 * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com>6 */7 8#include <linux/platform_device.h>9#include <linux/netdevice.h>10#include <linux/phy.h>11#include <linux/phy_fixed.h>12#include <linux/export.h>13#include <linux/ethtool.h>14#include <linux/workqueue.h>15#include <linux/module.h>16#include <linux/if_bridge.h>17#include <linux/dsa/loop.h>18#include <net/dsa.h>19 20#include "dsa_loop.h"21 22static struct dsa_loop_mib_entry dsa_loop_mibs[] = {23 [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", },24 [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },25 [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },26 [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },27};28 29static struct phy_device *phydevs[PHY_MAX_ADDR];30 31enum dsa_loop_devlink_resource_id {32 DSA_LOOP_DEVLINK_PARAM_ID_VTU,33};34 35static u64 dsa_loop_devlink_vtu_get(void *priv)36{37 struct dsa_loop_priv *ps = priv;38 unsigned int i, count = 0;39 struct dsa_loop_vlan *vl;40 41 for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) {42 vl = &ps->vlans[i];43 if (vl->members)44 count++;45 }46 47 return count;48}49 50static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds)51{52 struct devlink_resource_size_params size_params;53 struct dsa_loop_priv *ps = ds->priv;54 int err;55 56 devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans),57 ARRAY_SIZE(ps->vlans),58 1, DEVLINK_RESOURCE_UNIT_ENTRY);59 60 err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans),61 DSA_LOOP_DEVLINK_PARAM_ID_VTU,62 DEVLINK_RESOURCE_ID_PARENT_TOP,63 &size_params);64 if (err)65 goto out;66 67 dsa_devlink_resource_occ_get_register(ds,68 DSA_LOOP_DEVLINK_PARAM_ID_VTU,69 dsa_loop_devlink_vtu_get, ps);70 71 return 0;72 73out:74 dsa_devlink_resources_unregister(ds);75 return err;76}77 78static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,79 int port,80 enum dsa_tag_protocol mp)81{82 dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);83 84 return DSA_TAG_PROTO_NONE;85}86 87static int dsa_loop_setup(struct dsa_switch *ds)88{89 struct dsa_loop_priv *ps = ds->priv;90 unsigned int i;91 92 for (i = 0; i < ds->num_ports; i++)93 memcpy(ps->ports[i].mib, dsa_loop_mibs,94 sizeof(dsa_loop_mibs));95 96 dev_dbg(ds->dev, "%s\n", __func__);97 98 return dsa_loop_setup_devlink_resources(ds);99}100 101static void dsa_loop_teardown(struct dsa_switch *ds)102{103 dsa_devlink_resources_unregister(ds);104}105 106static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)107{108 if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)109 return 0;110 111 return __DSA_LOOP_CNT_MAX;112}113 114static void dsa_loop_get_strings(struct dsa_switch *ds, int port,115 u32 stringset, uint8_t *data)116{117 struct dsa_loop_priv *ps = ds->priv;118 unsigned int i;119 120 if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)121 return;122 123 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)124 memcpy(data + i * ETH_GSTRING_LEN,125 ps->ports[port].mib[i].name, ETH_GSTRING_LEN);126}127 128static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,129 uint64_t *data)130{131 struct dsa_loop_priv *ps = ds->priv;132 unsigned int i;133 134 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)135 data[i] = ps->ports[port].mib[i].val;136}137 138static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)139{140 struct dsa_loop_priv *ps = ds->priv;141 struct mii_bus *bus = ps->bus;142 int ret;143 144 ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);145 if (ret < 0)146 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;147 else148 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;149 150 return ret;151}152 153static int dsa_loop_phy_write(struct dsa_switch *ds, int port,154 int regnum, u16 value)155{156 struct dsa_loop_priv *ps = ds->priv;157 struct mii_bus *bus = ps->bus;158 int ret;159 160 ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);161 if (ret < 0)162 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;163 else164 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;165 166 return ret;167}168 169static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,170 struct dsa_bridge bridge,171 bool *tx_fwd_offload,172 struct netlink_ext_ack *extack)173{174 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",175 __func__, port, bridge.dev->name);176 177 return 0;178}179 180static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,181 struct dsa_bridge bridge)182{183 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",184 __func__, port, bridge.dev->name);185}186 187static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,188 u8 state)189{190 dev_dbg(ds->dev, "%s: port: %d, state: %d\n",191 __func__, port, state);192}193 194static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,195 bool vlan_filtering,196 struct netlink_ext_ack *extack)197{198 dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",199 __func__, port, vlan_filtering);200 201 return 0;202}203 204static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,205 const struct switchdev_obj_port_vlan *vlan,206 struct netlink_ext_ack *extack)207{208 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;209 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;210 struct dsa_loop_priv *ps = ds->priv;211 struct mii_bus *bus = ps->bus;212 struct dsa_loop_vlan *vl;213 214 if (vlan->vid >= ARRAY_SIZE(ps->vlans))215 return -ERANGE;216 217 /* Just do a sleeping operation to make lockdep checks effective */218 mdiobus_read(bus, ps->port_base + port, MII_BMSR);219 220 vl = &ps->vlans[vlan->vid];221 222 vl->members |= BIT(port);223 if (untagged)224 vl->untagged |= BIT(port);225 else226 vl->untagged &= ~BIT(port);227 228 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",229 __func__, port, vlan->vid, untagged ? "un" : "", pvid);230 231 if (pvid)232 ps->ports[port].pvid = vlan->vid;233 234 return 0;235}236 237static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,238 const struct switchdev_obj_port_vlan *vlan)239{240 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;241 struct dsa_loop_priv *ps = ds->priv;242 u16 pvid = ps->ports[port].pvid;243 struct mii_bus *bus = ps->bus;244 struct dsa_loop_vlan *vl;245 246 /* Just do a sleeping operation to make lockdep checks effective */247 mdiobus_read(bus, ps->port_base + port, MII_BMSR);248 249 vl = &ps->vlans[vlan->vid];250 251 vl->members &= ~BIT(port);252 if (untagged)253 vl->untagged &= ~BIT(port);254 255 if (pvid == vlan->vid)256 pvid = 1;257 258 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",259 __func__, port, vlan->vid, untagged ? "un" : "", pvid);260 ps->ports[port].pvid = pvid;261 262 return 0;263}264 265static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,266 int new_mtu)267{268 struct dsa_loop_priv *priv = ds->priv;269 270 priv->ports[port].mtu = new_mtu;271 272 return 0;273}274 275static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)276{277 return ETH_MAX_MTU;278}279 280static void dsa_loop_phylink_get_caps(struct dsa_switch *dsa, int port,281 struct phylink_config *config)282{283 bitmap_fill(config->supported_interfaces, PHY_INTERFACE_MODE_MAX);284 __clear_bit(PHY_INTERFACE_MODE_NA, config->supported_interfaces);285 config->mac_capabilities = ~0;286}287 288static const struct dsa_switch_ops dsa_loop_driver = {289 .get_tag_protocol = dsa_loop_get_protocol,290 .setup = dsa_loop_setup,291 .teardown = dsa_loop_teardown,292 .get_strings = dsa_loop_get_strings,293 .get_ethtool_stats = dsa_loop_get_ethtool_stats,294 .get_sset_count = dsa_loop_get_sset_count,295 .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats,296 .phy_read = dsa_loop_phy_read,297 .phy_write = dsa_loop_phy_write,298 .port_bridge_join = dsa_loop_port_bridge_join,299 .port_bridge_leave = dsa_loop_port_bridge_leave,300 .port_stp_state_set = dsa_loop_port_stp_state_set,301 .port_vlan_filtering = dsa_loop_port_vlan_filtering,302 .port_vlan_add = dsa_loop_port_vlan_add,303 .port_vlan_del = dsa_loop_port_vlan_del,304 .port_change_mtu = dsa_loop_port_change_mtu,305 .port_max_mtu = dsa_loop_port_max_mtu,306 .phylink_get_caps = dsa_loop_phylink_get_caps,307};308 309static int dsa_loop_drv_probe(struct mdio_device *mdiodev)310{311 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;312 struct dsa_loop_priv *ps;313 struct dsa_switch *ds;314 int ret;315 316 if (!pdata)317 return -ENODEV;318 319 ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);320 if (!ds)321 return -ENOMEM;322 323 ds->dev = &mdiodev->dev;324 ds->num_ports = DSA_LOOP_NUM_PORTS;325 326 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);327 if (!ps)328 return -ENOMEM;329 330 ps->netdev = dev_get_by_name(&init_net, pdata->netdev);331 if (!ps->netdev)332 return -EPROBE_DEFER;333 334 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;335 336 ds->dev = &mdiodev->dev;337 ds->ops = &dsa_loop_driver;338 ds->priv = ps;339 ps->bus = mdiodev->bus;340 341 dev_set_drvdata(&mdiodev->dev, ds);342 343 ret = dsa_register_switch(ds);344 if (!ret)345 dev_info(&mdiodev->dev, "%s: 0x%0x\n",346 pdata->name, pdata->enabled_ports);347 348 return ret;349}350 351static void dsa_loop_drv_remove(struct mdio_device *mdiodev)352{353 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);354 struct dsa_loop_priv *ps;355 356 if (!ds)357 return;358 359 ps = ds->priv;360 361 dsa_unregister_switch(ds);362 dev_put(ps->netdev);363}364 365static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)366{367 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);368 369 if (!ds)370 return;371 372 dsa_switch_shutdown(ds);373 374 dev_set_drvdata(&mdiodev->dev, NULL);375}376 377static struct mdio_driver dsa_loop_drv = {378 .mdiodrv.driver = {379 .name = "dsa-loop",380 },381 .probe = dsa_loop_drv_probe,382 .remove = dsa_loop_drv_remove,383 .shutdown = dsa_loop_drv_shutdown,384};385 386#define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2)387 388static void dsa_loop_phydevs_unregister(void)389{390 unsigned int i;391 392 for (i = 0; i < NUM_FIXED_PHYS; i++)393 if (!IS_ERR(phydevs[i])) {394 fixed_phy_unregister(phydevs[i]);395 phy_device_free(phydevs[i]);396 }397}398 399static int __init dsa_loop_init(void)400{401 struct fixed_phy_status status = {402 .link = 1,403 .speed = SPEED_100,404 .duplex = DUPLEX_FULL,405 };406 unsigned int i, ret;407 408 for (i = 0; i < NUM_FIXED_PHYS; i++)409 phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);410 411 ret = mdio_driver_register(&dsa_loop_drv);412 if (ret)413 dsa_loop_phydevs_unregister();414 415 return ret;416}417module_init(dsa_loop_init);418 419static void __exit dsa_loop_exit(void)420{421 mdio_driver_unregister(&dsa_loop_drv);422 dsa_loop_phydevs_unregister();423}424module_exit(dsa_loop_exit);425 426MODULE_SOFTDEP("pre: dsa_loop_bdinfo");427MODULE_LICENSE("GPL");428MODULE_AUTHOR("Florian Fainelli");429MODULE_DESCRIPTION("DSA loopback driver");430