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 <net/dsa.h> 18 19 #include "dsa_loop.h" 20 21 struct dsa_loop_vlan { 22 u16 members; 23 u16 untagged; 24 }; 25 26 struct dsa_loop_mib_entry { 27 char name[ETH_GSTRING_LEN]; 28 unsigned long val; 29 }; 30 31 enum dsa_loop_mib_counters { 32 DSA_LOOP_PHY_READ_OK, 33 DSA_LOOP_PHY_READ_ERR, 34 DSA_LOOP_PHY_WRITE_OK, 35 DSA_LOOP_PHY_WRITE_ERR, 36 __DSA_LOOP_CNT_MAX, 37 }; 38 39 static struct dsa_loop_mib_entry dsa_loop_mibs[] = { 40 [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", }, 41 [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", }, 42 [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", }, 43 [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", }, 44 }; 45 46 struct dsa_loop_port { 47 struct dsa_loop_mib_entry mib[__DSA_LOOP_CNT_MAX]; 48 }; 49 50 #define DSA_LOOP_VLANS 5 51 52 struct dsa_loop_priv { 53 struct mii_bus *bus; 54 unsigned int port_base; 55 struct dsa_loop_vlan vlans[DSA_LOOP_VLANS]; 56 struct net_device *netdev; 57 struct dsa_loop_port ports[DSA_MAX_PORTS]; 58 u16 pvid; 59 }; 60 61 static struct phy_device *phydevs[PHY_MAX_ADDR]; 62 63 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds, 64 int port, 65 enum dsa_tag_protocol mp) 66 { 67 dev_dbg(ds->dev, "%s: port: %d\n", __func__, port); 68 69 return DSA_TAG_PROTO_NONE; 70 } 71 72 static int dsa_loop_setup(struct dsa_switch *ds) 73 { 74 struct dsa_loop_priv *ps = ds->priv; 75 unsigned int i; 76 77 for (i = 0; i < ds->num_ports; i++) 78 memcpy(ps->ports[i].mib, dsa_loop_mibs, 79 sizeof(dsa_loop_mibs)); 80 81 dev_dbg(ds->dev, "%s\n", __func__); 82 83 return 0; 84 } 85 86 static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset) 87 { 88 if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS) 89 return 0; 90 91 return __DSA_LOOP_CNT_MAX; 92 } 93 94 static void dsa_loop_get_strings(struct dsa_switch *ds, int port, 95 u32 stringset, uint8_t *data) 96 { 97 struct dsa_loop_priv *ps = ds->priv; 98 unsigned int i; 99 100 if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS) 101 return; 102 103 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++) 104 memcpy(data + i * ETH_GSTRING_LEN, 105 ps->ports[port].mib[i].name, ETH_GSTRING_LEN); 106 } 107 108 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port, 109 uint64_t *data) 110 { 111 struct dsa_loop_priv *ps = ds->priv; 112 unsigned int i; 113 114 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++) 115 data[i] = ps->ports[port].mib[i].val; 116 } 117 118 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum) 119 { 120 struct dsa_loop_priv *ps = ds->priv; 121 struct mii_bus *bus = ps->bus; 122 int ret; 123 124 ret = mdiobus_read_nested(bus, ps->port_base + port, regnum); 125 if (ret < 0) 126 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++; 127 else 128 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++; 129 130 return ret; 131 } 132 133 static int dsa_loop_phy_write(struct dsa_switch *ds, int port, 134 int regnum, u16 value) 135 { 136 struct dsa_loop_priv *ps = ds->priv; 137 struct mii_bus *bus = ps->bus; 138 int ret; 139 140 ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value); 141 if (ret < 0) 142 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++; 143 else 144 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++; 145 146 return ret; 147 } 148 149 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port, 150 struct net_device *bridge) 151 { 152 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n", 153 __func__, port, bridge->name); 154 155 return 0; 156 } 157 158 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port, 159 struct net_device *bridge) 160 { 161 dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n", 162 __func__, port, bridge->name); 163 } 164 165 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port, 166 u8 state) 167 { 168 dev_dbg(ds->dev, "%s: port: %d, state: %d\n", 169 __func__, port, state); 170 } 171 172 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port, 173 bool vlan_filtering) 174 { 175 dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n", 176 __func__, port, vlan_filtering); 177 178 return 0; 179 } 180 181 static int 182 dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port, 183 const struct switchdev_obj_port_vlan *vlan) 184 { 185 struct dsa_loop_priv *ps = ds->priv; 186 struct mii_bus *bus = ps->bus; 187 188 dev_dbg(ds->dev, "%s: port: %d, vlan: %d-%d", 189 __func__, port, vlan->vid_begin, vlan->vid_end); 190 191 /* Just do a sleeping operation to make lockdep checks effective */ 192 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 193 194 if (vlan->vid_end > DSA_LOOP_VLANS) 195 return -ERANGE; 196 197 return 0; 198 } 199 200 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port, 201 const struct switchdev_obj_port_vlan *vlan) 202 { 203 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 204 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID; 205 struct dsa_loop_priv *ps = ds->priv; 206 struct mii_bus *bus = ps->bus; 207 struct dsa_loop_vlan *vl; 208 u16 vid; 209 210 /* Just do a sleeping operation to make lockdep checks effective */ 211 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 212 213 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { 214 vl = &ps->vlans[vid]; 215 216 vl->members |= BIT(port); 217 if (untagged) 218 vl->untagged |= BIT(port); 219 else 220 vl->untagged &= ~BIT(port); 221 222 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", 223 __func__, port, vid, untagged ? "un" : "", pvid); 224 } 225 226 if (pvid) 227 ps->pvid = vid; 228 } 229 230 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port, 231 const struct switchdev_obj_port_vlan *vlan) 232 { 233 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 234 struct dsa_loop_priv *ps = ds->priv; 235 struct mii_bus *bus = ps->bus; 236 struct dsa_loop_vlan *vl; 237 u16 vid, pvid = ps->pvid; 238 239 /* Just do a sleeping operation to make lockdep checks effective */ 240 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 241 242 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { 243 vl = &ps->vlans[vid]; 244 245 vl->members &= ~BIT(port); 246 if (untagged) 247 vl->untagged &= ~BIT(port); 248 249 if (pvid == vid) 250 pvid = 1; 251 252 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n", 253 __func__, port, vid, untagged ? "un" : "", pvid); 254 } 255 ps->pvid = pvid; 256 257 return 0; 258 } 259 260 static const struct dsa_switch_ops dsa_loop_driver = { 261 .get_tag_protocol = dsa_loop_get_protocol, 262 .setup = dsa_loop_setup, 263 .get_strings = dsa_loop_get_strings, 264 .get_ethtool_stats = dsa_loop_get_ethtool_stats, 265 .get_sset_count = dsa_loop_get_sset_count, 266 .get_ethtool_phy_stats = dsa_loop_get_ethtool_stats, 267 .phy_read = dsa_loop_phy_read, 268 .phy_write = dsa_loop_phy_write, 269 .port_bridge_join = dsa_loop_port_bridge_join, 270 .port_bridge_leave = dsa_loop_port_bridge_leave, 271 .port_stp_state_set = dsa_loop_port_stp_state_set, 272 .port_vlan_filtering = dsa_loop_port_vlan_filtering, 273 .port_vlan_prepare = dsa_loop_port_vlan_prepare, 274 .port_vlan_add = dsa_loop_port_vlan_add, 275 .port_vlan_del = dsa_loop_port_vlan_del, 276 }; 277 278 static int dsa_loop_drv_probe(struct mdio_device *mdiodev) 279 { 280 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data; 281 struct dsa_loop_priv *ps; 282 struct dsa_switch *ds; 283 284 if (!pdata) 285 return -ENODEV; 286 287 dev_info(&mdiodev->dev, "%s: 0x%0x\n", 288 pdata->name, pdata->enabled_ports); 289 290 ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL); 291 if (!ds) 292 return -ENOMEM; 293 294 ds->dev = &mdiodev->dev; 295 ds->num_ports = DSA_MAX_PORTS; 296 297 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL); 298 if (!ps) 299 return -ENOMEM; 300 301 ps->netdev = dev_get_by_name(&init_net, pdata->netdev); 302 if (!ps->netdev) 303 return -EPROBE_DEFER; 304 305 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev; 306 307 ds->dev = &mdiodev->dev; 308 ds->ops = &dsa_loop_driver; 309 ds->priv = ps; 310 ps->bus = mdiodev->bus; 311 312 dev_set_drvdata(&mdiodev->dev, ds); 313 314 return dsa_register_switch(ds); 315 } 316 317 static void dsa_loop_drv_remove(struct mdio_device *mdiodev) 318 { 319 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev); 320 struct dsa_loop_priv *ps = ds->priv; 321 322 dsa_unregister_switch(ds); 323 dev_put(ps->netdev); 324 } 325 326 static struct mdio_driver dsa_loop_drv = { 327 .mdiodrv.driver = { 328 .name = "dsa-loop", 329 }, 330 .probe = dsa_loop_drv_probe, 331 .remove = dsa_loop_drv_remove, 332 }; 333 334 #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2) 335 336 static int __init dsa_loop_init(void) 337 { 338 struct fixed_phy_status status = { 339 .link = 1, 340 .speed = SPEED_100, 341 .duplex = DUPLEX_FULL, 342 }; 343 unsigned int i; 344 345 for (i = 0; i < NUM_FIXED_PHYS; i++) 346 phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL); 347 348 return mdio_driver_register(&dsa_loop_drv); 349 } 350 module_init(dsa_loop_init); 351 352 static void __exit dsa_loop_exit(void) 353 { 354 unsigned int i; 355 356 mdio_driver_unregister(&dsa_loop_drv); 357 for (i = 0; i < NUM_FIXED_PHYS; i++) 358 if (!IS_ERR(phydevs[i])) 359 fixed_phy_unregister(phydevs[i]); 360 } 361 module_exit(dsa_loop_exit); 362 363 MODULE_LICENSE("GPL"); 364 MODULE_AUTHOR("Florian Fainelli"); 365 MODULE_DESCRIPTION("DSA loopback driver"); 366