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 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"); 429