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 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 } 287 288 static 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 }; 308 309 static 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 } 350 351 static 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 } 364 365 static 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 } 376 377 static 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) 387 388 static 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 } 398 399 static 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 } 417 module_init(dsa_loop_init); 418 419 static void __exit dsa_loop_exit(void) 420 { 421 mdio_driver_unregister(&dsa_loop_drv); 422 dsa_loop_phydevs_unregister(); 423 } 424 module_exit(dsa_loop_exit); 425 426 MODULE_SOFTDEP("pre: dsa_loop_bdinfo"); 427 MODULE_LICENSE("GPL"); 428 MODULE_AUTHOR("Florian Fainelli"); 429 MODULE_DESCRIPTION("DSA loopback driver"); 430