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 <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
  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                 memcpy(data + i * ETH_GSTRING_LEN,
 125                        ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
 126 }
 127
 128 static 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
 138 static 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         else
 148                 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
 149
 150         return ret;
 151 }
 152
 153 static 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         else
 164                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
 165
 166         return ret;
 167 }
 168
 169 static 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
 180 static 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
 187 static 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
 194 static 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
 204 static 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         else
 226                 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
 237 static 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
 265 static 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
 275 static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
 276 {
 277         return ETH_MAX_MTU;
 278 }
 279
 280 static const struct dsa_switch_ops dsa_loop_driver = {
 281         .get_tag_protocol       = dsa_loop_get_protocol,
 282         .setup                  = dsa_loop_setup,
 283         .teardown               = dsa_loop_teardown,
 284         .get_strings            = dsa_loop_get_strings,
 285         .get_ethtool_stats      = dsa_loop_get_ethtool_stats,
 286         .get_sset_count         = dsa_loop_get_sset_count,
 287         .get_ethtool_phy_stats  = dsa_loop_get_ethtool_stats,
 288         .phy_read               = dsa_loop_phy_read,
 289         .phy_write              = dsa_loop_phy_write,
 290         .port_bridge_join       = dsa_loop_port_bridge_join,
 291         .port_bridge_leave      = dsa_loop_port_bridge_leave,
 292         .port_stp_state_set     = dsa_loop_port_stp_state_set,
 293         .port_vlan_filtering    = dsa_loop_port_vlan_filtering,
 294         .port_vlan_add          = dsa_loop_port_vlan_add,
 295         .port_vlan_del          = dsa_loop_port_vlan_del,
 296         .port_change_mtu        = dsa_loop_port_change_mtu,
 297         .port_max_mtu           = dsa_loop_port_max_mtu,
 298 };
 299
 300 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
 301 {
 302         struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
 303         struct dsa_loop_priv *ps;
 304         struct dsa_switch *ds;
 305         int ret;
 306
 307         if (!pdata)
 308                 return -ENODEV;
 309
 310         ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
 311         if (!ds)
 312                 return -ENOMEM;
 313
 314         ds->dev = &mdiodev->dev;
 315         ds->num_ports = DSA_LOOP_NUM_PORTS;
 316
 317         ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
 318         if (!ps)
 319                 return -ENOMEM;
 320
 321         ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
 322         if (!ps->netdev)
 323                 return -EPROBE_DEFER;
 324
 325         pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
 326
 327         ds->dev = &mdiodev->dev;
 328         ds->ops = &dsa_loop_driver;
 329         ds->priv = ps;
 330         ps->bus = mdiodev->bus;
 331
 332         dev_set_drvdata(&mdiodev->dev, ds);
 333
 334         ret = dsa_register_switch(ds);
 335         if (!ret)
 336                 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
 337                          pdata->name, pdata->enabled_ports);
 338
 339         return ret;
 340 }
 341
 342 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
 343 {
 344         struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 345         struct dsa_loop_priv *ps;
 346
 347         if (!ds)
 348                 return;
 349
 350         ps = ds->priv;
 351
 352         dsa_unregister_switch(ds);
 353         dev_put(ps->netdev);
 354 }
 355
 356 static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev)
 357 {
 358         struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 359
 360         if (!ds)
 361                 return;
 362
 363         dsa_switch_shutdown(ds);
 364
 365         dev_set_drvdata(&mdiodev->dev, NULL);
 366 }
 367
 368 static struct mdio_driver dsa_loop_drv = {
 369         .mdiodrv.driver = {
 370                 .name   = "dsa-loop",
 371         },
 372         .probe  = dsa_loop_drv_probe,
 373         .remove = dsa_loop_drv_remove,
 374         .shutdown = dsa_loop_drv_shutdown,
 375 };
 376
 377 #define NUM_FIXED_PHYS  (DSA_LOOP_NUM_PORTS - 2)
 378
 379 static int __init dsa_loop_init(void)
 380 {
 381         struct fixed_phy_status status = {
 382                 .link = 1,
 383                 .speed = SPEED_100,
 384                 .duplex = DUPLEX_FULL,
 385         };
 386         unsigned int i;
 387
 388         for (i = 0; i < NUM_FIXED_PHYS; i++)
 389                 phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
 390
 391         return mdio_driver_register(&dsa_loop_drv);
 392 }
 393 module_init(dsa_loop_init);
 394
 395 static void __exit dsa_loop_exit(void)
 396 {
 397         unsigned int i;
 398
 399         mdio_driver_unregister(&dsa_loop_drv);
 400         for (i = 0; i < NUM_FIXED_PHYS; i++)
 401                 if (!IS_ERR(phydevs[i]))
 402                         fixed_phy_unregister(phydevs[i]);
 403 }
 404 module_exit(dsa_loop_exit);
 405
 406 MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
 407 MODULE_LICENSE("GPL");
 408 MODULE_AUTHOR("Florian Fainelli");
 409 MODULE_DESCRIPTION("DSA loopback driver");