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_phy_read(struct dsa_switch *ds, int port, int regnum)
 114 {
 115         struct dsa_loop_priv *ps = ds->priv;
 116         struct mii_bus *bus = ps->bus;
 117         int ret;
 118
 119         dev_dbg(ds->dev, "%s\n", __func__);
 120
 121         ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
 122         if (ret < 0)
 123                 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
 124         else
 125                 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
 126
 127         return ret;
 128 }
 129
 130 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
 131                               int regnum, u16 value)
 132 {
 133         struct dsa_loop_priv *ps = ds->priv;
 134         struct mii_bus *bus = ps->bus;
 135         int ret;
 136
 137         dev_dbg(ds->dev, "%s\n", __func__);
 138
 139         ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
 140         if (ret < 0)
 141                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
 142         else
 143                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
 144
 145         return ret;
 146 }
 147
 148 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
 149                                      struct net_device *bridge)
 150 {
 151         dev_dbg(ds->dev, "%s\n", __func__);
 152
 153         return 0;
 154 }
 155
 156 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
 157                                        struct net_device *bridge)
 158 {
 159         dev_dbg(ds->dev, "%s\n", __func__);
 160 }
 161
 162 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
 163                                         u8 state)
 164 {
 165         dev_dbg(ds->dev, "%s\n", __func__);
 166 }
 167
 168 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
 169                                         bool vlan_filtering)
 170 {
 171         dev_dbg(ds->dev, "%s\n", __func__);
 172
 173         return 0;
 174 }
 175
 176 static int dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
 177                                       const struct switchdev_obj_port_vlan *vlan,
 178                                       struct switchdev_trans *trans)
 179 {
 180         struct dsa_loop_priv *ps = ds->priv;
 181         struct mii_bus *bus = ps->bus;
 182
 183         dev_dbg(ds->dev, "%s\n", __func__);
 184
 185         /* Just do a sleeping operation to make lockdep checks effective */
 186         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 187
 188         if (vlan->vid_end > DSA_LOOP_VLANS)
 189                 return -ERANGE;
 190
 191         return 0;
 192 }
 193
 194 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
 195                                    const struct switchdev_obj_port_vlan *vlan,
 196                                    struct switchdev_trans *trans)
 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");