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 net_device *bridge) 171 { 172 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n", 173 __func__, port, bridge->name); 174 175 return 0; 176 } 177 178 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port, 179 struct net_device *bridge) 180 { 181 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n", 182 __func__, port, bridge->name); 183 } 184 185 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port, 186 u8 state) 187 { 188 dev_dbg(ds->dev, "%s: port: %d, state: %d\n", 189 __func__, port, state); 190 } 191 192 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port, 193 bool vlan_filtering) 194 { 195 dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n", 196 __func__, port, vlan_filtering); 197 198 return 0; 199 } 200 201 static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port, 202 const struct switchdev_obj_port_vlan *vlan) 203 { 204 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 205 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID; 206 struct dsa_loop_priv *ps = ds->priv; 207 struct mii_bus *bus = ps->bus; 208 struct dsa_loop_vlan *vl; 209 210 if (vlan->vid >= ARRAY_SIZE(ps->vlans)) 211 return -ERANGE; 212 213 /* Just do a sleeping operation to make lockdep checks effective */ 214 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 215 216 vl = &ps->vlans[vlan->vid]; 217 218 vl->members |= BIT(port); 219 if (untagged) 220 vl->untagged |= BIT(port); 221 else 222 vl->untagged &= ~BIT(port); 223 224 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", 225 __func__, port, vlan->vid, untagged ? "un" : "", pvid); 226 227 if (pvid) 228 ps->ports[port].pvid = vlan->vid; 229 230 return 0; 231 } 232 233 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port, 234 const struct switchdev_obj_port_vlan *vlan) 235 { 236 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 237 struct dsa_loop_priv *ps = ds->priv; 238 u16 pvid = ps->ports[port].pvid; 239 struct mii_bus *bus = ps->bus; 240 struct dsa_loop_vlan *vl; 241 242 /* Just do a sleeping operation to make lockdep checks effective */ 243 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 244 245 vl = &ps->vlans[vlan->vid]; 246 247 vl->members &= ~BIT(port); 248 if (untagged) 249 vl->untagged &= ~BIT(port); 250 251 if (pvid == vlan->vid) 252 pvid = 1; 253 254 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", 255 __func__, port, vlan->vid, untagged ? "un" : "", pvid); 256 ps->ports[port].pvid = pvid; 257 258 return 0; 259 } 260 261 static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port, 262 int new_mtu) 263 { 264 struct dsa_loop_priv *priv = ds->priv; 265 266 priv->ports[port].mtu = new_mtu; 267 268 return 0; 269 } 270 271 static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port) 272 { 273 return ETH_MAX_MTU; 274 } 275 276 static const struct dsa_switch_ops dsa_loop_driver = { 277 .get_tag_protocol = dsa_loop_get_protocol, 278 .setup = dsa_loop_setup, 279 .teardown = dsa_loop_teardown, 280 .get_strings = dsa_loop_get_strings, 281 .get_ethtool_stats = dsa_loop_get_ethtool_stats, 282 .get_sset_count = dsa_loop_get_sset_count, 283 .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats, 284 .phy_read = dsa_loop_phy_read, 285 .phy_write = dsa_loop_phy_write, 286 .port_bridge_join = dsa_loop_port_bridge_join, 287 .port_bridge_leave = dsa_loop_port_bridge_leave, 288 .port_stp_state_set = dsa_loop_port_stp_state_set, 289 .port_vlan_filtering = dsa_loop_port_vlan_filtering, 290 .port_vlan_add = dsa_loop_port_vlan_add, 291 .port_vlan_del = dsa_loop_port_vlan_del, 292 .port_change_mtu = dsa_loop_port_change_mtu, 293 .port_max_mtu = dsa_loop_port_max_mtu, 294 }; 295 296 static int dsa_loop_drv_probe(struct mdio_device *mdiodev) 297 { 298 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data; 299 struct dsa_loop_priv *ps; 300 struct dsa_switch *ds; 301 int ret; 302 303 if (!pdata) 304 return -ENODEV; 305 306 ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL); 307 if (!ds) 308 return -ENOMEM; 309 310 ds->dev = &mdiodev->dev; 311 ds->num_ports = DSA_LOOP_NUM_PORTS; 312 313 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL); 314 if (!ps) 315 return -ENOMEM; 316 317 ps->netdev = dev_get_by_name(&init_net, pdata->netdev); 318 if (!ps->netdev) 319 return -EPROBE_DEFER; 320 321 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev; 322 323 ds->dev = &mdiodev->dev; 324 ds->ops = &dsa_loop_driver; 325 ds->priv = ps; 326 ps->bus = mdiodev->bus; 327 328 dev_set_drvdata(&mdiodev->dev, ds); 329 330 ret = dsa_register_switch(ds); 331 if (!ret) 332 dev_info(&mdiodev->dev, "%s: 0x%0x\n", 333 pdata->name, pdata->enabled_ports); 334 335 return ret; 336 } 337 338 static void dsa_loop_drv_remove(struct mdio_device *mdiodev) 339 { 340 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev); 341 struct dsa_loop_priv *ps = ds->priv; 342 343 dsa_unregister_switch(ds); 344 dev_put(ps->netdev); 345 } 346 347 static struct mdio_driver dsa_loop_drv = { 348 .mdiodrv.driver = { 349 .name = "dsa-loop", 350 }, 351 .probe = dsa_loop_drv_probe, 352 .remove = dsa_loop_drv_remove, 353 }; 354 355 #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2) 356 357 static int __init dsa_loop_init(void) 358 { 359 struct fixed_phy_status status = { 360 .link = 1, 361 .speed = SPEED_100, 362 .duplex = DUPLEX_FULL, 363 }; 364 unsigned int i; 365 366 for (i = 0; i < NUM_FIXED_PHYS; i++) 367 phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL); 368 369 return mdio_driver_register(&dsa_loop_drv); 370 } 371 module_init(dsa_loop_init); 372 373 static void __exit dsa_loop_exit(void) 374 { 375 unsigned int i; 376 377 mdio_driver_unregister(&dsa_loop_drv); 378 for (i = 0; i < NUM_FIXED_PHYS; i++) 379 if (!IS_ERR(phydevs[i])) 380 fixed_phy_unregister(phydevs[i]); 381 } 382 module_exit(dsa_loop_exit); 383 384 MODULE_SOFTDEP("pre: dsa_loop_bdinfo"); 385 MODULE_LICENSE("GPL"); 386 MODULE_AUTHOR("Florian Fainelli"); 387 MODULE_DESCRIPTION("DSA loopback driver"); 388