drivers/net/dsa/dsa_loop.c

   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");