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 #define DSA_LOOP_NUM_PORTS 6 21 #define DSA_LOOP_CPU_PORT (DSA_LOOP_NUM_PORTS - 1) 22 #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2) 23 24 struct dsa_loop_pdata { 25 /* Must be first, such that dsa_register_switch() can access this 26 * without gory pointer manipulations 27 */ 28 struct dsa_chip_data cd; 29 const char *name; 30 unsigned int enabled_ports; 31 const char *netdev; 32 }; 33 34 static struct dsa_loop_mib_entry dsa_loop_mibs[] = { 35 [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", }, 36 [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", }, 37 [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", }, 38 [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", }, 39 }; 40 41 static struct phy_device *phydevs[PHY_MAX_ADDR]; 42 static struct mdio_device *switch_mdiodev; 43 44 enum dsa_loop_devlink_resource_id { 45 DSA_LOOP_DEVLINK_PARAM_ID_VTU, 46 }; 47 48 static u64 dsa_loop_devlink_vtu_get(void *priv) 49 { 50 struct dsa_loop_priv *ps = priv; 51 unsigned int i, count = 0; 52 struct dsa_loop_vlan *vl; 53 54 for (i = 0; i < ARRAY_SIZE(ps->vlans); i++) { 55 vl = &ps->vlans[i]; 56 if (vl->members) 57 count++; 58 } 59 60 return count; 61 } 62 63 static int dsa_loop_setup_devlink_resources(struct dsa_switch *ds) 64 { 65 struct devlink_resource_size_params size_params; 66 struct dsa_loop_priv *ps = ds->priv; 67 int err; 68 69 devlink_resource_size_params_init(&size_params, ARRAY_SIZE(ps->vlans), 70 ARRAY_SIZE(ps->vlans), 71 1, DEVLINK_RESOURCE_UNIT_ENTRY); 72 73 err = dsa_devlink_resource_register(ds, "VTU", ARRAY_SIZE(ps->vlans), 74 DSA_LOOP_DEVLINK_PARAM_ID_VTU, 75 DEVLINK_RESOURCE_ID_PARENT_TOP, 76 &size_params); 77 if (err) 78 goto out; 79 80 dsa_devlink_resource_occ_get_register(ds, 81 DSA_LOOP_DEVLINK_PARAM_ID_VTU, 82 dsa_loop_devlink_vtu_get, ps); 83 84 return 0; 85 86 out: 87 dsa_devlink_resources_unregister(ds); 88 return err; 89 } 90 91 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds, 92 int port, 93 enum dsa_tag_protocol mp) 94 { 95 dev_dbg(ds->dev, "%s: port: %d\n", __func__, port); 96 97 return DSA_TAG_PROTO_NONE; 98 } 99 100 static int dsa_loop_setup(struct dsa_switch *ds) 101 { 102 struct dsa_loop_priv *ps = ds->priv; 103 unsigned int i; 104 105 for (i = 0; i < ds->num_ports; i++) 106 memcpy(ps->ports[i].mib, dsa_loop_mibs, 107 sizeof(dsa_loop_mibs)); 108 109 dev_dbg(ds->dev, "%s\n", __func__); 110 111 return dsa_loop_setup_devlink_resources(ds); 112 } 113 114 static void dsa_loop_teardown(struct dsa_switch *ds) 115 { 116 dsa_devlink_resources_unregister(ds); 117 } 118 119 static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset) 120 { 121 if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS) 122 return 0; 123 124 return __DSA_LOOP_CNT_MAX; 125 } 126 127 static void dsa_loop_get_strings(struct dsa_switch *ds, int port, 128 u32 stringset, uint8_t *data) 129 { 130 struct dsa_loop_priv *ps = ds->priv; 131 unsigned int i; 132 133 if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS) 134 return; 135 136 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++) 137 ethtool_puts(&data, ps->ports[port].mib[i].name); 138 } 139 140 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port, 141 uint64_t *data) 142 { 143 struct dsa_loop_priv *ps = ds->priv; 144 unsigned int i; 145 146 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++) 147 data[i] = ps->ports[port].mib[i].val; 148 } 149 150 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum) 151 { 152 struct dsa_loop_priv *ps = ds->priv; 153 struct mii_bus *bus = ps->bus; 154 int ret; 155 156 ret = mdiobus_read_nested(bus, ps->port_base + port, regnum); 157 if (ret < 0) 158 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++; 159 else 160 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++; 161 162 return ret; 163 } 164 165 static int dsa_loop_phy_write(struct dsa_switch *ds, int port, 166 int regnum, u16 value) 167 { 168 struct dsa_loop_priv *ps = ds->priv; 169 struct mii_bus *bus = ps->bus; 170 int ret; 171 172 ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value); 173 if (ret < 0) 174 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++; 175 else 176 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++; 177 178 return ret; 179 } 180 181 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port, 182 struct dsa_bridge bridge, 183 bool *tx_fwd_offload, 184 struct netlink_ext_ack *extack) 185 { 186 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n", 187 __func__, port, bridge.dev->name); 188 189 return 0; 190 } 191 192 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port, 193 struct dsa_bridge bridge) 194 { 195 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n", 196 __func__, port, bridge.dev->name); 197 } 198 199 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port, 200 u8 state) 201 { 202 dev_dbg(ds->dev, "%s: port: %d, state: %d\n", 203 __func__, port, state); 204 } 205 206 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port, 207 bool vlan_filtering, 208 struct netlink_ext_ack *extack) 209 { 210 dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n", 211 __func__, port, vlan_filtering); 212 213 return 0; 214 } 215 216 static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port, 217 const struct switchdev_obj_port_vlan *vlan, 218 struct netlink_ext_ack *extack) 219 { 220 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 221 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID; 222 struct dsa_loop_priv *ps = ds->priv; 223 struct mii_bus *bus = ps->bus; 224 struct dsa_loop_vlan *vl; 225 226 if (vlan->vid >= ARRAY_SIZE(ps->vlans)) 227 return -ERANGE; 228 229 /* Just do a sleeping operation to make lockdep checks effective */ 230 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 231 232 vl = &ps->vlans[vlan->vid]; 233 234 vl->members |= BIT(port); 235 if (untagged) 236 vl->untagged |= BIT(port); 237 else 238 vl->untagged &= ~BIT(port); 239 240 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", 241 __func__, port, vlan->vid, untagged ? "un" : "", pvid); 242 243 if (pvid) 244 ps->ports[port].pvid = vlan->vid; 245 246 return 0; 247 } 248 249 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port, 250 const struct switchdev_obj_port_vlan *vlan) 251 { 252 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 253 struct dsa_loop_priv *ps = ds->priv; 254 u16 pvid = ps->ports[port].pvid; 255 struct mii_bus *bus = ps->bus; 256 struct dsa_loop_vlan *vl; 257 258 /* Just do a sleeping operation to make lockdep checks effective */ 259 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 260 261 vl = &ps->vlans[vlan->vid]; 262 263 vl->members &= ~BIT(port); 264 if (untagged) 265 vl->untagged &= ~BIT(port); 266 267 if (pvid == vlan->vid) 268 pvid = 1; 269 270 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", 271 __func__, port, vlan->vid, untagged ? "un" : "", pvid); 272 ps->ports[port].pvid = pvid; 273 274 return 0; 275 } 276 277 static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port, 278 int new_mtu) 279 { 280 struct dsa_loop_priv *priv = ds->priv; 281 282 priv->ports[port].mtu = new_mtu; 283 284 return 0; 285 } 286 287 static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port) 288 { 289 return ETH_MAX_MTU; 290 } 291 292 static void dsa_loop_phylink_get_caps(struct dsa_switch *dsa, int port, 293 struct phylink_config *config) 294 { 295 bitmap_fill(config->supported_interfaces, PHY_INTERFACE_MODE_MAX); 296 __clear_bit(PHY_INTERFACE_MODE_NA, config->supported_interfaces); 297 config->mac_capabilities = ~0; 298 } 299 300 static const struct dsa_switch_ops dsa_loop_driver = { 301 .get_tag_protocol = dsa_loop_get_protocol, 302 .setup = dsa_loop_setup, 303 .teardown = dsa_loop_teardown, 304 .get_strings = dsa_loop_get_strings, 305 .get_ethtool_stats = dsa_loop_get_ethtool_stats, 306 .get_sset_count = dsa_loop_get_sset_count, 307 .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats, 308 .phy_read = dsa_loop_phy_read, 309 .phy_write = dsa_loop_phy_write, 310 .port_bridge_join = dsa_loop_port_bridge_join, 311 .port_bridge_leave = dsa_loop_port_bridge_leave, 312 .port_stp_state_set = dsa_loop_port_stp_state_set, 313 .port_vlan_filtering = dsa_loop_port_vlan_filtering, 314 .port_vlan_add = dsa_loop_port_vlan_add, 315 .port_vlan_del = dsa_loop_port_vlan_del, 316 .port_change_mtu = dsa_loop_port_change_mtu, 317 .port_max_mtu = dsa_loop_port_max_mtu, 318 .phylink_get_caps = dsa_loop_phylink_get_caps, 319 }; 320 321 static int dsa_loop_drv_probe(struct mdio_device *mdiodev) 322 { 323 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data; 324 struct dsa_loop_priv *ps; 325 struct dsa_switch *ds; 326 int ret; 327 328 if (!pdata) 329 return -ENODEV; 330 331 ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL); 332 if (!ds) 333 return -ENOMEM; 334 335 ds->dev = &mdiodev->dev; 336 ds->num_ports = DSA_LOOP_NUM_PORTS; 337 338 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL); 339 if (!ps) 340 return -ENOMEM; 341 342 ps->netdev = dev_get_by_name(&init_net, pdata->netdev); 343 if (!ps->netdev) 344 return -EPROBE_DEFER; 345 346 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev; 347 348 ds->dev = &mdiodev->dev; 349 ds->ops = &dsa_loop_driver; 350 ds->priv = ps; 351 ps->bus = mdiodev->bus; 352 353 dev_set_drvdata(&mdiodev->dev, ds); 354 355 ret = dsa_register_switch(ds); 356 if (!ret) 357 dev_info(&mdiodev->dev, "%s: 0x%0x\n", 358 pdata->name, pdata->enabled_ports); 359 360 return ret; 361 } 362 363 static void dsa_loop_drv_remove(struct mdio_device *mdiodev) 364 { 365 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev); 366 struct dsa_loop_priv *ps; 367 368 if (!ds) 369 return; 370 371 ps = ds->priv; 372 373 dsa_unregister_switch(ds); 374 dev_put(ps->netdev); 375 } 376 377 static void dsa_loop_drv_shutdown(struct mdio_device *mdiodev) 378 { 379 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev); 380 381 if (!ds) 382 return; 383 384 dsa_switch_shutdown(ds); 385 386 dev_set_drvdata(&mdiodev->dev, NULL); 387 } 388 389 static struct mdio_driver dsa_loop_drv = { 390 .mdiodrv.driver = { 391 .name = "dsa-loop", 392 }, 393 .probe = dsa_loop_drv_probe, 394 .remove = dsa_loop_drv_remove, 395 .shutdown = dsa_loop_drv_shutdown, 396 }; 397 398 static void dsa_loop_phydevs_unregister(void) 399 { 400 for (int i = 0; i < NUM_FIXED_PHYS; i++) { 401 if (!IS_ERR(phydevs[i])) 402 fixed_phy_unregister(phydevs[i]); 403 } 404 } 405 406 static int __init dsa_loop_create_switch_mdiodev(void) 407 { 408 static struct dsa_loop_pdata dsa_loop_pdata = { 409 .cd = { 410 .port_names[0] = "lan1", 411 .port_names[1] = "lan2", 412 .port_names[2] = "lan3", 413 .port_names[3] = "lan4", 414 .port_names[DSA_LOOP_CPU_PORT] = "cpu", 415 }, 416 .name = "DSA mockup driver", 417 .enabled_ports = 0x1f, 418 .netdev = "eth0", 419 }; 420 struct mii_bus *bus; 421 int ret = -ENODEV; 422 423 bus = mdio_find_bus("fixed-0"); 424 if (WARN_ON(!bus)) 425 return ret; 426 427 switch_mdiodev = mdio_device_create(bus, 31); 428 if (IS_ERR(switch_mdiodev)) 429 goto out; 430 431 strscpy(switch_mdiodev->modalias, "dsa-loop"); 432 switch_mdiodev->dev.platform_data = &dsa_loop_pdata; 433 434 ret = mdio_device_register(switch_mdiodev); 435 if (ret) 436 mdio_device_free(switch_mdiodev); 437 out: 438 put_device(&bus->dev); 439 return ret; 440 } 441 442 static int __init dsa_loop_init(void) 443 { 444 struct fixed_phy_status status = { 445 .link = 1, 446 .speed = SPEED_100, 447 .duplex = DUPLEX_FULL, 448 }; 449 unsigned int i; 450 int ret; 451 452 ret = dsa_loop_create_switch_mdiodev(); 453 if (ret) 454 return ret; 455 456 for (i = 0; i < NUM_FIXED_PHYS; i++) 457 phydevs[i] = fixed_phy_register(&status, NULL); 458 459 ret = mdio_driver_register(&dsa_loop_drv); 460 if (ret) { 461 dsa_loop_phydevs_unregister(); 462 mdio_device_remove(switch_mdiodev); 463 mdio_device_free(switch_mdiodev); 464 } 465 466 return ret; 467 } 468 module_init(dsa_loop_init); 469 470 static void __exit dsa_loop_exit(void) 471 { 472 mdio_driver_unregister(&dsa_loop_drv); 473 dsa_loop_phydevs_unregister(); 474 mdio_device_remove(switch_mdiodev); 475 mdio_device_free(switch_mdiodev); 476 } 477 module_exit(dsa_loop_exit); 478 479 MODULE_LICENSE("GPL"); 480 MODULE_AUTHOR("Florian Fainelli"); 481 MODULE_DESCRIPTION("DSA loopback driver"); 482