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 {
  69         dev_dbg(ds->dev, "%s\n", __func__);
  70
  71         return DSA_TAG_PROTO_NONE;
  72 }
  73
  74 static int dsa_loop_setup(struct dsa_switch *ds)
  75 {
  76         struct dsa_loop_priv *ps = ds->priv;
  77         unsigned int i;
  78
  79         for (i = 0; i < ds->num_ports; i++)
  80                 memcpy(ps->ports[i].mib, dsa_loop_mibs,
  81                        sizeof(dsa_loop_mibs));
  82
  83         dev_dbg(ds->dev, "%s\n", __func__);
  84
  85         return 0;
  86 }
  87
  88 static int dsa_loop_get_sset_count(struct dsa_switch *ds)
  89 {
  90         return __DSA_LOOP_CNT_MAX;
  91 }
  92
  93 static void dsa_loop_get_strings(struct dsa_switch *ds, int port, uint8_t *data)
  94 {
  95         struct dsa_loop_priv *ps = ds->priv;
  96         unsigned int i;
  97
  98         for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
  99                 memcpy(data + i * ETH_GSTRING_LEN,
 100                        ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
 101 }
 102
 103 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
 104                                        uint64_t *data)
 105 {
 106         struct dsa_loop_priv *ps = ds->priv;
 107         unsigned int i;
 108
 109         for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
 110                 data[i] = ps->ports[port].mib[i].val;
 111 }
 112
 113 static int dsa_loop_set_addr(struct dsa_switch *ds, u8 *addr)
 114 {
 115         dev_dbg(ds->dev, "%s\n", __func__);
 116
 117         return 0;
 118 }
 119
 120 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
 121 {
 122         struct dsa_loop_priv *ps = ds->priv;
 123         struct mii_bus *bus = ps->bus;
 124         int ret;
 125
 126         dev_dbg(ds->dev, "%s\n", __func__);
 127
 128         ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
 129         if (ret < 0)
 130                 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
 131         else
 132                 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
 133
 134         return ret;
 135 }
 136
 137 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
 138                               int regnum, u16 value)
 139 {
 140         struct dsa_loop_priv *ps = ds->priv;
 141         struct mii_bus *bus = ps->bus;
 142         int ret;
 143
 144         dev_dbg(ds->dev, "%s\n", __func__);
 145
 146         ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
 147         if (ret < 0)
 148                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
 149         else
 150                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
 151
 152         return ret;
 153 }
 154
 155 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
 156                                      struct net_device *bridge)
 157 {
 158         dev_dbg(ds->dev, "%s\n", __func__);
 159
 160         return 0;
 161 }
 162
 163 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
 164                                        struct net_device *bridge)
 165 {
 166         dev_dbg(ds->dev, "%s\n", __func__);
 167 }
 168
 169 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
 170                                         u8 state)
 171 {
 172         dev_dbg(ds->dev, "%s\n", __func__);
 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\n", __func__);
 179
 180         return 0;
 181 }
 182
 183 static int dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
 184                                       const struct switchdev_obj_port_vlan *vlan,
 185                                       struct switchdev_trans *trans)
 186 {
 187         struct dsa_loop_priv *ps = ds->priv;
 188         struct mii_bus *bus = ps->bus;
 189
 190         dev_dbg(ds->dev, "%s\n", __func__);
 191
 192         /* Just do a sleeping operation to make lockdep checks effective */
 193         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 194
 195         if (vlan->vid_end > DSA_LOOP_VLANS)
 196                 return -ERANGE;
 197
 198         return 0;
 199 }
 200
 201 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
 202                                    const struct switchdev_obj_port_vlan *vlan,
 203                                    struct switchdev_trans *trans)
 204 {
 205         bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 206         bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
 207         struct dsa_loop_priv *ps = ds->priv;
 208         struct mii_bus *bus = ps->bus;
 209         struct dsa_loop_vlan *vl;
 210         u16 vid;
 211
 212         dev_dbg(ds->dev, "%s\n", __func__);
 213
 214         /* Just do a sleeping operation to make lockdep checks effective */
 215         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 216
 217         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 218                 vl = &ps->vlans[vid];
 219
 220                 vl->members |= BIT(port);
 221                 if (untagged)
 222                         vl->untagged |= BIT(port);
 223                 else
 224                         vl->untagged &= ~BIT(port);
 225         }
 226
 227         if (pvid)
 228                 ps->pvid = vid;
 229 }
 230
 231 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
 232                                   const struct switchdev_obj_port_vlan *vlan)
 233 {
 234         bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 235         struct dsa_loop_priv *ps = ds->priv;
 236         struct mii_bus *bus = ps->bus;
 237         struct dsa_loop_vlan *vl;
 238         u16 vid, pvid = ps->pvid;
 239
 240         dev_dbg(ds->dev, "%s\n", __func__);
 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         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         .set_addr               = dsa_loop_set_addr,
 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 = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
 291         if (!ds)
 292                 return -ENOMEM;
 293
 294         ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
 295         if (!ps)
 296                 return -ENOMEM;
 297
 298         ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
 299         if (!ps->netdev)
 300                 return -EPROBE_DEFER;
 301
 302         pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
 303
 304         ds->dev = &mdiodev->dev;
 305         ds->ops = &dsa_loop_driver;
 306         ds->priv = ps;
 307         ps->bus = mdiodev->bus;
 308
 309         dev_set_drvdata(&mdiodev->dev, ds);
 310
 311         return dsa_register_switch(ds);
 312 }
 313
 314 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
 315 {
 316         struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 317         struct dsa_loop_priv *ps = ds->priv;
 318
 319         dsa_unregister_switch(ds);
 320         dev_put(ps->netdev);
 321 }
 322
 323 static struct mdio_driver dsa_loop_drv = {
 324         .mdiodrv.driver = {
 325                 .name   = "dsa-loop",
 326         },
 327         .probe  = dsa_loop_drv_probe,
 328         .remove = dsa_loop_drv_remove,
 329 };
 330
 331 #define NUM_FIXED_PHYS  (DSA_LOOP_NUM_PORTS - 2)
 332
 333 static int __init dsa_loop_init(void)
 334 {
 335         struct fixed_phy_status status = {
 336                 .link = 1,
 337                 .speed = SPEED_100,
 338                 .duplex = DUPLEX_FULL,
 339         };
 340         unsigned int i;
 341
 342         for (i = 0; i < NUM_FIXED_PHYS; i++)
 343                 phydevs[i] = fixed_phy_register(PHY_POLL, &status, -1, NULL);
 344
 345         return mdio_driver_register(&dsa_loop_drv);
 346 }
 347 module_init(dsa_loop_init);
 348
 349 static void __exit dsa_loop_exit(void)
 350 {
 351         unsigned int i;
 352
 353         mdio_driver_unregister(&dsa_loop_drv);
 354         for (i = 0; i < NUM_FIXED_PHYS; i++)
 355                 if (!IS_ERR(phydevs[i]))
 356                         fixed_phy_unregister(phydevs[i]);
 357 }
 358 module_exit(dsa_loop_exit);
 359
 360 MODULE_LICENSE("GPL");
 361 MODULE_AUTHOR("Florian Fainelli");
 362 MODULE_DESCRIPTION("DSA loopback driver");