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 struct netlink_ext_ack *extack) 195 { 196 dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n", 197 __func__, port, vlan_filtering); 198 199 return 0; 200 } 201 202 static int dsa_loop_port_vlan_add(struct dsa_switch *ds, int port, 203 const struct switchdev_obj_port_vlan *vlan, 204 struct netlink_ext_ack *extack) 205 { 206 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 207 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID; 208 struct dsa_loop_priv *ps = ds->priv; 209 struct mii_bus *bus = ps->bus; 210 struct dsa_loop_vlan *vl; 211 212 if (vlan->vid >= ARRAY_SIZE(ps->vlans)) 213 return -ERANGE; 214 215 /* Just do a sleeping operation to make lockdep checks effective */ 216 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 217 218 vl = &ps->vlans[vlan->vid]; 219 220 vl->members |= BIT(port); 221 if (untagged) 222 vl->untagged |= BIT(port); 223 else 224 vl->untagged &= ~BIT(port); 225 226 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", 227 __func__, port, vlan->vid, untagged ? "un" : "", pvid); 228 229 if (pvid) 230 ps->ports[port].pvid = vlan->vid; 231 232 return 0; 233 } 234 235 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port, 236 const struct switchdev_obj_port_vlan *vlan) 237 { 238 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 239 struct dsa_loop_priv *ps = ds->priv; 240 u16 pvid = ps->ports[port].pvid; 241 struct mii_bus *bus = ps->bus; 242 struct dsa_loop_vlan *vl; 243 244 /* Just do a sleeping operation to make lockdep checks effective */ 245 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 246 247 vl = &ps->vlans[vlan->vid]; 248 249 vl->members &= ~BIT(port); 250 if (untagged) 251 vl->untagged &= ~BIT(port); 252 253 if (pvid == vlan->vid) 254 pvid = 1; 255 256 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", 257 __func__, port, vlan->vid, untagged ? "un" : "", pvid); 258 ps->ports[port].pvid = pvid; 259 260 return 0; 261 } 262 263 static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port, 264 int new_mtu) 265 { 266 struct dsa_loop_priv *priv = ds->priv; 267 268 priv->ports[port].mtu = new_mtu; 269 270 return 0; 271 } 272 273 static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port) 274 { 275 return ETH_MAX_MTU; 276 } 277 278 static const struct dsa_switch_ops dsa_loop_driver = { 279 .get_tag_protocol = dsa_loop_get_protocol, 280 .setup = dsa_loop_setup, 281 .teardown = dsa_loop_teardown, 282 .get_strings = dsa_loop_get_strings, 283 .get_ethtool_stats = dsa_loop_get_ethtool_stats, 284 .get_sset_count = dsa_loop_get_sset_count, 285 .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats, 286 .phy_read = dsa_loop_phy_read, 287 .phy_write = dsa_loop_phy_write, 288 .port_bridge_join = dsa_loop_port_bridge_join, 289 .port_bridge_leave = dsa_loop_port_bridge_leave, 290 .port_stp_state_set = dsa_loop_port_stp_state_set, 291 .port_vlan_filtering = dsa_loop_port_vlan_filtering, 292 .port_vlan_add = dsa_loop_port_vlan_add, 293 .port_vlan_del = dsa_loop_port_vlan_del, 294 .port_change_mtu = dsa_loop_port_change_mtu, 295 .port_max_mtu = dsa_loop_port_max_mtu, 296 }; 297 298 static int dsa_loop_drv_probe(struct mdio_device *mdiodev) 299 { 300 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data; 301 struct dsa_loop_priv *ps; 302 struct dsa_switch *ds; 303 int ret; 304 305 if (!pdata) 306 return -ENODEV; 307 308 ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL); 309 if (!ds) 310 return -ENOMEM; 311 312 ds->dev = &mdiodev->dev; 313 ds->num_ports = DSA_LOOP_NUM_PORTS; 314 315 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL); 316 if (!ps) 317 return -ENOMEM; 318 319 ps->netdev = dev_get_by_name(&init_net, pdata->netdev); 320 if (!ps->netdev) 321 return -EPROBE_DEFER; 322 323 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev; 324 325 ds->dev = &mdiodev->dev; 326 ds->ops = &dsa_loop_driver; 327 ds->priv = ps; 328 ps->bus = mdiodev->bus; 329 330 dev_set_drvdata(&mdiodev->dev, ds); 331 332 ret = dsa_register_switch(ds); 333 if (!ret) 334 dev_info(&mdiodev->dev, "%s: 0x%0x\n", 335 pdata->name, pdata->enabled_ports); 336 337 return ret; 338 } 339 340 static void dsa_loop_drv_remove(struct mdio_device *mdiodev) 341 { 342 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev); 343 struct dsa_loop_priv *ps = ds->priv; 344 345 dsa_unregister_switch(ds); 346 dev_put(ps->netdev); 347 } 348 349 static struct mdio_driver dsa_loop_drv = { 350 .mdiodrv.driver = { 351 .name = "dsa-loop", 352 }, 353 .probe = dsa_loop_drv_probe, 354 .remove = dsa_loop_drv_remove, 355 }; 356 357 #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2) 358 359 static int __init dsa_loop_init(void) 360 { 361 struct fixed_phy_status status = { 362 .link = 1, 363 .speed = SPEED_100, 364 .duplex = DUPLEX_FULL, 365 }; 366 unsigned int i; 367 368 for (i = 0; i < NUM_FIXED_PHYS; i++) 369 phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL); 370 371 return mdio_driver_register(&dsa_loop_drv); 372 } 373 module_init(dsa_loop_init); 374 375 static void __exit dsa_loop_exit(void) 376 { 377 unsigned int i; 378 379 mdio_driver_unregister(&dsa_loop_drv); 380 for (i = 0; i < NUM_FIXED_PHYS; i++) 381 if (!IS_ERR(phydevs[i])) 382 fixed_phy_unregister(phydevs[i]); 383 } 384 module_exit(dsa_loop_exit); 385 386 MODULE_SOFTDEP("pre: dsa_loop_bdinfo"); 387 MODULE_LICENSE("GPL"); 388 MODULE_AUTHOR("Florian Fainelli"); 389 MODULE_DESCRIPTION("DSA loopback driver"); 390