1 /* 2 * Distributed Switch Architecture loopback driver 3 * 4 * Copyright (C) 2016, Florian Fainelli <f.fainelli@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/platform_device.h> 13 #include <linux/netdevice.h> 14 #include <linux/phy.h> 15 #include <linux/phy_fixed.h> 16 #include <linux/export.h> 17 #include <linux/ethtool.h> 18 #include <linux/workqueue.h> 19 #include <linux/module.h> 20 #include <linux/if_bridge.h> 21 #include <net/dsa.h> 22 23 #include "dsa_loop.h" 24 25 struct dsa_loop_vlan { 26 u16 members; 27 u16 untagged; 28 }; 29 30 struct dsa_loop_mib_entry { 31 char name[ETH_GSTRING_LEN]; 32 unsigned long val; 33 }; 34 35 enum dsa_loop_mib_counters { 36 DSA_LOOP_PHY_READ_OK, 37 DSA_LOOP_PHY_READ_ERR, 38 DSA_LOOP_PHY_WRITE_OK, 39 DSA_LOOP_PHY_WRITE_ERR, 40 __DSA_LOOP_CNT_MAX, 41 }; 42 43 static struct dsa_loop_mib_entry dsa_loop_mibs[] = { 44 [DSA_LOOP_PHY_READ_OK] = { "phy_read_ok", }, 45 [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", }, 46 [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", }, 47 [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", }, 48 }; 49 50 struct dsa_loop_port { 51 struct dsa_loop_mib_entry mib[__DSA_LOOP_CNT_MAX]; 52 }; 53 54 #define DSA_LOOP_VLANS 5 55 56 struct dsa_loop_priv { 57 struct mii_bus *bus; 58 unsigned int port_base; 59 struct dsa_loop_vlan vlans[DSA_LOOP_VLANS]; 60 struct net_device *netdev; 61 struct dsa_loop_port ports[DSA_MAX_PORTS]; 62 u16 pvid; 63 }; 64 65 static struct phy_device *phydevs[PHY_MAX_ADDR]; 66 67 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds, 68 int port) 69 { 70 dev_dbg(ds->dev, "%s\n", __func__); 71 72 return DSA_TAG_PROTO_NONE; 73 } 74 75 static int dsa_loop_setup(struct dsa_switch *ds) 76 { 77 struct dsa_loop_priv *ps = ds->priv; 78 unsigned int i; 79 80 for (i = 0; i < ds->num_ports; i++) 81 memcpy(ps->ports[i].mib, dsa_loop_mibs, 82 sizeof(dsa_loop_mibs)); 83 84 dev_dbg(ds->dev, "%s\n", __func__); 85 86 return 0; 87 } 88 89 static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port) 90 { 91 return __DSA_LOOP_CNT_MAX; 92 } 93 94 static void dsa_loop_get_strings(struct dsa_switch *ds, int port, uint8_t *data) 95 { 96 struct dsa_loop_priv *ps = ds->priv; 97 unsigned int i; 98 99 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++) 100 memcpy(data + i * ETH_GSTRING_LEN, 101 ps->ports[port].mib[i].name, ETH_GSTRING_LEN); 102 } 103 104 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port, 105 uint64_t *data) 106 { 107 struct dsa_loop_priv *ps = ds->priv; 108 unsigned int i; 109 110 for (i = 0; i < __DSA_LOOP_CNT_MAX; i++) 111 data[i] = ps->ports[port].mib[i].val; 112 } 113 114 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum) 115 { 116 struct dsa_loop_priv *ps = ds->priv; 117 struct mii_bus *bus = ps->bus; 118 int ret; 119 120 dev_dbg(ds->dev, "%s\n", __func__); 121 122 ret = mdiobus_read_nested(bus, ps->port_base + port, regnum); 123 if (ret < 0) 124 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++; 125 else 126 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++; 127 128 return ret; 129 } 130 131 static int dsa_loop_phy_write(struct dsa_switch *ds, int port, 132 int regnum, u16 value) 133 { 134 struct dsa_loop_priv *ps = ds->priv; 135 struct mii_bus *bus = ps->bus; 136 int ret; 137 138 dev_dbg(ds->dev, "%s\n", __func__); 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\n", __func__); 153 154 return 0; 155 } 156 157 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port, 158 struct net_device *bridge) 159 { 160 dev_dbg(ds->dev, "%s\n", __func__); 161 } 162 163 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port, 164 u8 state) 165 { 166 dev_dbg(ds->dev, "%s\n", __func__); 167 } 168 169 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port, 170 bool vlan_filtering) 171 { 172 dev_dbg(ds->dev, "%s\n", __func__); 173 174 return 0; 175 } 176 177 static int 178 dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port, 179 const struct switchdev_obj_port_vlan *vlan) 180 { 181 struct dsa_loop_priv *ps = ds->priv; 182 struct mii_bus *bus = ps->bus; 183 184 dev_dbg(ds->dev, "%s\n", __func__); 185 186 /* Just do a sleeping operation to make lockdep checks effective */ 187 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 188 189 if (vlan->vid_end > DSA_LOOP_VLANS) 190 return -ERANGE; 191 192 return 0; 193 } 194 195 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port, 196 const struct switchdev_obj_port_vlan *vlan) 197 { 198 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 199 bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID; 200 struct dsa_loop_priv *ps = ds->priv; 201 struct mii_bus *bus = ps->bus; 202 struct dsa_loop_vlan *vl; 203 u16 vid; 204 205 dev_dbg(ds->dev, "%s\n", __func__); 206 207 /* Just do a sleeping operation to make lockdep checks effective */ 208 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 209 210 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { 211 vl = &ps->vlans[vid]; 212 213 vl->members |= BIT(port); 214 if (untagged) 215 vl->untagged |= BIT(port); 216 else 217 vl->untagged &= ~BIT(port); 218 } 219 220 if (pvid) 221 ps->pvid = vid; 222 } 223 224 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port, 225 const struct switchdev_obj_port_vlan *vlan) 226 { 227 bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED; 228 struct dsa_loop_priv *ps = ds->priv; 229 struct mii_bus *bus = ps->bus; 230 struct dsa_loop_vlan *vl; 231 u16 vid, pvid = ps->pvid; 232 233 dev_dbg(ds->dev, "%s\n", __func__); 234 235 /* Just do a sleeping operation to make lockdep checks effective */ 236 mdiobus_read(bus, ps->port_base + port, MII_BMSR); 237 238 for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) { 239 vl = &ps->vlans[vid]; 240 241 vl->members &= ~BIT(port); 242 if (untagged) 243 vl->untagged &= ~BIT(port); 244 245 if (pvid == vid) 246 pvid = 1; 247 } 248 ps->pvid = pvid; 249 250 return 0; 251 } 252 253 static const struct dsa_switch_ops dsa_loop_driver = { 254 .get_tag_protocol = dsa_loop_get_protocol, 255 .setup = dsa_loop_setup, 256 .get_strings = dsa_loop_get_strings, 257 .get_ethtool_stats = dsa_loop_get_ethtool_stats, 258 .get_sset_count = dsa_loop_get_sset_count, 259 .phy_read = dsa_loop_phy_read, 260 .phy_write = dsa_loop_phy_write, 261 .port_bridge_join = dsa_loop_port_bridge_join, 262 .port_bridge_leave = dsa_loop_port_bridge_leave, 263 .port_stp_state_set = dsa_loop_port_stp_state_set, 264 .port_vlan_filtering = dsa_loop_port_vlan_filtering, 265 .port_vlan_prepare = dsa_loop_port_vlan_prepare, 266 .port_vlan_add = dsa_loop_port_vlan_add, 267 .port_vlan_del = dsa_loop_port_vlan_del, 268 }; 269 270 static int dsa_loop_drv_probe(struct mdio_device *mdiodev) 271 { 272 struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data; 273 struct dsa_loop_priv *ps; 274 struct dsa_switch *ds; 275 276 if (!pdata) 277 return -ENODEV; 278 279 dev_info(&mdiodev->dev, "%s: 0x%0x\n", 280 pdata->name, pdata->enabled_ports); 281 282 ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS); 283 if (!ds) 284 return -ENOMEM; 285 286 ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL); 287 if (!ps) 288 return -ENOMEM; 289 290 ps->netdev = dev_get_by_name(&init_net, pdata->netdev); 291 if (!ps->netdev) 292 return -EPROBE_DEFER; 293 294 pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev; 295 296 ds->dev = &mdiodev->dev; 297 ds->ops = &dsa_loop_driver; 298 ds->priv = ps; 299 ps->bus = mdiodev->bus; 300 301 dev_set_drvdata(&mdiodev->dev, ds); 302 303 return dsa_register_switch(ds); 304 } 305 306 static void dsa_loop_drv_remove(struct mdio_device *mdiodev) 307 { 308 struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev); 309 struct dsa_loop_priv *ps = ds->priv; 310 311 dsa_unregister_switch(ds); 312 dev_put(ps->netdev); 313 } 314 315 static struct mdio_driver dsa_loop_drv = { 316 .mdiodrv.driver = { 317 .name = "dsa-loop", 318 }, 319 .probe = dsa_loop_drv_probe, 320 .remove = dsa_loop_drv_remove, 321 }; 322 323 #define NUM_FIXED_PHYS (DSA_LOOP_NUM_PORTS - 2) 324 325 static int __init dsa_loop_init(void) 326 { 327 struct fixed_phy_status status = { 328 .link = 1, 329 .speed = SPEED_100, 330 .duplex = DUPLEX_FULL, 331 }; 332 unsigned int i; 333 334 for (i = 0; i < NUM_FIXED_PHYS; i++) 335 phydevs[i] = fixed_phy_register(PHY_POLL, &status, -1, NULL); 336 337 return mdio_driver_register(&dsa_loop_drv); 338 } 339 module_init(dsa_loop_init); 340 341 static void __exit dsa_loop_exit(void) 342 { 343 unsigned int i; 344 345 mdio_driver_unregister(&dsa_loop_drv); 346 for (i = 0; i < NUM_FIXED_PHYS; i++) 347 if (!IS_ERR(phydevs[i])) 348 fixed_phy_unregister(phydevs[i]); 349 } 350 module_exit(dsa_loop_exit); 351 352 MODULE_LICENSE("GPL"); 353 MODULE_AUTHOR("Florian Fainelli"); 354 MODULE_DESCRIPTION("DSA loopback driver"); 355