drivers/net/dsa/dsa_loop.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Distributed Switch Architecture loopback driver
   4  *
   5  * Copyright (C) 2016, Florian Fainelli <[email protected]>
   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
  22 static 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
  29 static struct phy_device *phydevs[PHY_MAX_ADDR];
  30
  31 enum dsa_loop_devlink_resource_id {
  32         DSA_LOOP_DEVLINK_PARAM_ID_VTU,
  33 };
  34
  35 static 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
  50 static 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
  73 out:
  74         dsa_devlink_resources_unregister(ds);
  75         return err;
  76 }
  77
  78 static 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
  87 static 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
 101 static void dsa_loop_teardown(struct dsa_switch *ds)
 102 {
 103         dsa_devlink_resources_unregister(ds);
 104 }
 105
 106 static 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
 114 static 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                 ethtool_puts(&data, ps->ports[port].mib[i].name);
 125 }
 126
 127 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
 128                                        uint64_t *data)
 129 {
 130         struct dsa_loop_priv *ps = ds->priv;
 131         unsigned int i;
 132
 133         for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
 134                 data[i] = ps->ports[port].mib[i].val;
 135 }
 136
 137 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
 138 {
 139         struct dsa_loop_priv *ps = ds->priv;
 140         struct mii_bus *bus = ps->bus;
 141         int ret;
 142
 143         ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
 144         if (ret < 0)
 145                 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
 146         else
 147                 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
 148
 149         return ret;
 150 }
 151
 152 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
 153                               int regnum, u16 value)
 154 {
 155         struct dsa_loop_priv *ps = ds->priv;
 156         struct mii_bus *bus = ps->bus;
 157         int ret;
 158
 159         ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
 160         if (ret < 0)
 161                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
 162         else
 163                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
 164
 165         return ret;
 166 }
 167
 168 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
 169                                      struct dsa_bridge bridge,
 170                                      bool *tx_fwd_offload,
 171                                      struct netlink_ext_ack *extack)
 172 {
 173         dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
 174                 __func__, port, bridge.dev->name);
 175
 176         return 0;
 177 }
 178
 179 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
 180                                        struct dsa_bridge bridge)
 181 {
 182         dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
 183                 __func__, port, bridge.dev->name);
 184 }
 185
 186 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
 187                                         u8 state)
 188 {
 189         dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
 190                 __func__, port, state);
 191 }
 192
 193 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
 194                                         bool vlan_filtering,
 195                                         struct netlink_ext_ack *extack)
 196 {
 197         dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
 198                 __func__, port, vlan_filtering);
 199
 200         return 0;
 201 }
 202
 203 static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
 204                                   const struct switchdev_obj_port_vlan *vlan,
 205                                   struct netlink_ext_ack *extack)
 206 {
 207         bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 208         bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
 209         struct dsa_loop_priv *ps = ds->priv;
 210         struct mii_bus *bus = ps->bus;
 211         struct dsa_loop_vlan *vl;
 212
 213         if (vlan->vid >= ARRAY_SIZE(ps->vlans))
 214                 return -ERANGE;
 215
 216         /* Just do a sleeping operation to make lockdep checks effective */
 217         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 218
 219         vl = &ps->vlans[vlan->vid];
 220
 221         vl->members |= BIT(port);
 222         if (untagged)
 223                 vl->untagged |= BIT(port);
 224         else
 225                 vl->untagged &= ~BIT(port);
 226
 227         dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
 228                 __func__, port, vlan->vid, untagged ? "un" : "", pvid);
 229
 230         if (pvid)
 231                 ps->ports[port].pvid = vlan->vid;
 232
 233         return 0;
 234 }
 235
 236 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
 237                                   const struct switchdev_obj_port_vlan *vlan)
 238 {
 239         bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 240         struct dsa_loop_priv *ps = ds->priv;
 241         u16 pvid = ps->ports[port].pvid;
 242         struct mii_bus *bus = ps->bus;
 243         struct dsa_loop_vlan *vl;
 244
 245         /* Just do a sleeping operation to make lockdep checks effective */
 246         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 247
 248         vl = &ps->vlans[vlan->vid];
 249
 250         vl->members &= ~BIT(port);
 251         if (untagged)
 252                 vl->untagged &= ~BIT(port);
 253
 254         if (pvid == vlan->vid)
 255                 pvid = 1;
 256
 257         dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
 258                 __func__, port, vlan->vid, untagged ? "un" : "", pvid);
 259         ps->ports[port].pvid = pvid;
 260
 261         return 0;
 262 }
 263
 264 static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
 265                                     int new_mtu)
 266 {
 267         struct dsa_loop_priv *priv = ds->priv;
 268
 269         priv->ports[port].mtu = new_mtu;
 270
 271         return 0;
 272 }
 273
 274 static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
 275 {
 276         return ETH_MAX_MTU;
 277 }
 278
 279 static void dsa_loop_phylink_get_caps(struct dsa_switch *dsa, int port,
 280                                       struct phylink_config *config)
 281 {
 282         bitmap_fill(config->supported_interfaces, PHY_INTERFACE_MODE_MAX);
 283         __clear_bit(PHY_INTERFACE_MODE_NA, config->supported_interfaces);
 284         config->mac_capabilities = ~0;
 285 }
 286
 287 static const struct dsa_switch_ops dsa_loop_driver = {
 288         .get_tag_protocol       = dsa_loop_get_protocol,
 289         .setup                  = dsa_loop_setup,
 290         .teardown               = dsa_loop_teardown,
 291         .get_strings            = dsa_loop_get_strings,
 292         .get_ethtool_stats      = dsa_loop_get_ethtool_stats,
 293         .get_sset_count         = dsa_loop_get_sset_count,
 294         .get_ethtool_phy_stats  = dsa_loop_get_ethtool_stats,
 295         .phy_read               = dsa_loop_phy_read,
 296         .phy_write              = dsa_loop_phy_write,
 297         .port_bridge_join       = dsa_loop_port_bridge_join,
 298         .port_bridge_leave      = dsa_loop_port_bridge_leave,
 299         .port_stp_state_set     = dsa_loop_port_stp_state_set,
 300         .port_vlan_filtering    = dsa_loop_port_vlan_filtering,
 301         .port_vlan_add          = dsa_loop_port_vlan_add,
 302         .port_vlan_del          = dsa_loop_port_vlan_del,
 303         .port_change_mtu        = dsa_loop_port_change_mtu,
 304         .port_max_mtu           = dsa_loop_port_max_mtu,
 305         .phylink_get_caps       = dsa_loop_phylink_get_caps,
 306 };
 307
 308 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
 309 {
 310         struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
 311         struct dsa_loop_priv *ps;
 312         struct dsa_switch *ds;
 313         int ret;
 314
 315         if (!pdata)
 316                 return -ENODEV;
 317
 318         ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
 319         if (!ds)
 320                 return -ENOMEM;
 321
 322         ds->dev = &mdiodev->dev;
 323         ds->num_ports = DSA_LOOP_NUM_PORTS;
 324
 325         ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
 326         if (!ps)
 327                 return -ENOMEM;
 328
 329         ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
 330         if (!ps->netdev)
 331                 return -EPROBE_DEFER;
 332
 333         pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
 334
 335         ds->dev = &mdiodev->dev;
 336         ds->ops = &dsa_loop_driver;
 337         ds->priv = ps;
 338         ps->bus = mdiodev->bus;
 339
 340         dev_set_drvdata(&mdiodev->dev, ds);
 341
 342         ret = dsa_register_switch(ds);
 343         if (!ret)
 344                 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
 345                          pdata->name, pdata->enabled_ports);
 346
 347         return ret;
 348 }
 349
 350 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
 351 {
 352         struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 353         struct dsa_loop_priv *ps;
 354
 355         if (!ds)
 356                 return;
 357
 358         ps = ds->priv;
 359
 360         dsa_unregister_switch(ds);
 361         dev_put(ps->netdev);
 362 }
 363
 364 static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
 365 {
 366         struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 367
 368         if (!ds)
 369                 return;
 370
 371         dsa_switch_shutdown(ds);
 372
 373         dev_set_drvdata(&mdiodev->dev, NULL);
 374 }
 375
 376 static struct mdio_driver dsa_loop_drv = {
 377         .mdiodrv.driver = {
 378                 .name   = "dsa-loop",
 379         },
 380         .probe  = dsa_loop_drv_probe,
 381         .remove = dsa_loop_drv_remove,
 382         .shutdown = dsa_loop_drv_shutdown,
 383 };
 384
 385 #define NUM_FIXED_PHYS  (DSA_LOOP_NUM_PORTS - 2)
 386
 387 static void dsa_loop_phydevs_unregister(void)
 388 {
 389         unsigned int i;
 390
 391         for (i = 0; i < NUM_FIXED_PHYS; i++)
 392                 if (!IS_ERR(phydevs[i])) {
 393                         fixed_phy_unregister(phydevs[i]);
 394                         phy_device_free(phydevs[i]);
 395                 }
 396 }
 397
 398 static int __init dsa_loop_init(void)
 399 {
 400         struct fixed_phy_status status = {
 401                 .link = 1,
 402                 .speed = SPEED_100,
 403                 .duplex = DUPLEX_FULL,
 404         };
 405         unsigned int i, ret;
 406
 407         for (i = 0; i < NUM_FIXED_PHYS; i++)
 408                 phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
 409
 410         ret = mdio_driver_register(&dsa_loop_drv);
 411         if (ret)
 412                 dsa_loop_phydevs_unregister();
 413
 414         return ret;
 415 }
 416 module_init(dsa_loop_init);
 417
 418 static void __exit dsa_loop_exit(void)
 419 {
 420         mdio_driver_unregister(&dsa_loop_drv);
 421         dsa_loop_phydevs_unregister();
 422 }
 423 module_exit(dsa_loop_exit);
 424
 425 MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
 426 MODULE_LICENSE("GPL");
 427 MODULE_AUTHOR("Florian Fainelli");
 428 MODULE_DESCRIPTION("DSA loopback driver");