drivers/net/dsa/dsa_loop.c

   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: port: %d\n", __func__, port);
  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, int sset)
  90 {
  91         if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
  92                 return 0;
  93
  94         return __DSA_LOOP_CNT_MAX;
  95 }
  96
  97 static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
  98                                  u32 stringset, uint8_t *data)
  99 {
 100         struct dsa_loop_priv *ps = ds->priv;
 101         unsigned int i;
 102
 103         if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
 104                 return;
 105
 106         for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
 107                 memcpy(data + i * ETH_GSTRING_LEN,
 108                        ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
 109 }
 110
 111 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
 112                                        uint64_t *data)
 113 {
 114         struct dsa_loop_priv *ps = ds->priv;
 115         unsigned int i;
 116
 117         for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
 118                 data[i] = ps->ports[port].mib[i].val;
 119 }
 120
 121 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
 122 {
 123         struct dsa_loop_priv *ps = ds->priv;
 124         struct mii_bus *bus = ps->bus;
 125         int ret;
 126
 127         ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
 128         if (ret < 0)
 129                 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
 130         else
 131                 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
 132
 133         return ret;
 134 }
 135
 136 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
 137                               int regnum, u16 value)
 138 {
 139         struct dsa_loop_priv *ps = ds->priv;
 140         struct mii_bus *bus = ps->bus;
 141         int ret;
 142
 143         ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
 144         if (ret < 0)
 145                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
 146         else
 147                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
 148
 149         return ret;
 150 }
 151
 152 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
 153                                      struct net_device *bridge)
 154 {
 155         dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
 156                 __func__, port, bridge->name);
 157
 158         return 0;
 159 }
 160
 161 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
 162                                        struct net_device *bridge)
 163 {
 164         dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
 165                 __func__, port, bridge->name);
 166 }
 167
 168 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
 169                                         u8 state)
 170 {
 171         dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
 172                 __func__, port, state);
 173 }
 174
 175 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
 176                                         bool vlan_filtering)
 177 {
 178         dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
 179                 __func__, port, vlan_filtering);
 180
 181         return 0;
 182 }
 183
 184 static int
 185 dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
 186                            const struct switchdev_obj_port_vlan *vlan)
 187 {
 188         struct dsa_loop_priv *ps = ds->priv;
 189         struct mii_bus *bus = ps->bus;
 190
 191         dev_dbg(ds->dev, "%s: port: %d, vlan: %d-%d",
 192                 __func__, port, vlan->vid_begin, vlan->vid_end);
 193
 194         /* Just do a sleeping operation to make lockdep checks effective */
 195         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 196
 197         if (vlan->vid_end > DSA_LOOP_VLANS)
 198                 return -ERANGE;
 199
 200         return 0;
 201 }
 202
 203 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
 204                                    const struct switchdev_obj_port_vlan *vlan)
 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         u16 vid;
 212
 213         /* Just do a sleeping operation to make lockdep checks effective */
 214         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 215
 216         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 217                 vl = &ps->vlans[vid];
 218
 219                 vl->members |= BIT(port);
 220                 if (untagged)
 221                         vl->untagged |= BIT(port);
 222                 else
 223                         vl->untagged &= ~BIT(port);
 224
 225                 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
 226                         __func__, port, vid, untagged ? "un" : "", pvid);
 227         }
 228
 229         if (pvid)
 230                 ps->pvid = vid;
 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         struct mii_bus *bus = ps->bus;
 239         struct dsa_loop_vlan *vl;
 240         u16 vid, pvid = ps->pvid;
 241
 242         /* Just do a sleeping operation to make lockdep checks effective */
 243         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 244
 245         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 246                 vl = &ps->vlans[vid];
 247
 248                 vl->members &= ~BIT(port);
 249                 if (untagged)
 250                         vl->untagged &= ~BIT(port);
 251
 252                 if (pvid == vid)
 253                         pvid = 1;
 254
 255                 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
 256                         __func__, port, vid, untagged ? "un" : "", pvid);
 257         }
 258         ps->pvid = pvid;
 259
 260         return 0;
 261 }
 262
 263 static const struct dsa_switch_ops dsa_loop_driver = {
 264         .get_tag_protocol       = dsa_loop_get_protocol,
 265         .setup                  = dsa_loop_setup,
 266         .get_strings            = dsa_loop_get_strings,
 267         .get_ethtool_stats      = dsa_loop_get_ethtool_stats,
 268         .get_sset_count         = dsa_loop_get_sset_count,
 269         .get_ethtool_phy_stats  = dsa_loop_get_ethtool_stats,
 270         .phy_read               = dsa_loop_phy_read,
 271         .phy_write              = dsa_loop_phy_write,
 272         .port_bridge_join       = dsa_loop_port_bridge_join,
 273         .port_bridge_leave      = dsa_loop_port_bridge_leave,
 274         .port_stp_state_set     = dsa_loop_port_stp_state_set,
 275         .port_vlan_filtering    = dsa_loop_port_vlan_filtering,
 276         .port_vlan_prepare      = dsa_loop_port_vlan_prepare,
 277         .port_vlan_add          = dsa_loop_port_vlan_add,
 278         .port_vlan_del          = dsa_loop_port_vlan_del,
 279 };
 280
 281 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
 282 {
 283         struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
 284         struct dsa_loop_priv *ps;
 285         struct dsa_switch *ds;
 286
 287         if (!pdata)
 288                 return -ENODEV;
 289
 290         dev_info(&mdiodev->dev, "%s: 0x%0x\n",
 291                  pdata->name, pdata->enabled_ports);
 292
 293         ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
 294         if (!ds)
 295                 return -ENOMEM;
 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, -1, 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_SOFTDEP("pre: dsa_loop_bdinfo");
 364 MODULE_LICENSE("GPL");
 365 MODULE_AUTHOR("Florian Fainelli");
 366 MODULE_DESCRIPTION("DSA loopback driver");