drivers/net/dsa/dsa_loop.c

   1 /*
   2  * Distributed Switch Architecture loopback driver
   3  *
   4  * Copyright (C) 2016, Florian Fainelli <[email protected]>
   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)
  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 dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
 178                                       const struct switchdev_obj_port_vlan *vlan,
 179                                       struct switchdev_trans *trans)
 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                                    struct switchdev_trans *trans)
 198 {
 199         bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 200         bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
 201         struct dsa_loop_priv *ps = ds->priv;
 202         struct mii_bus *bus = ps->bus;
 203         struct dsa_loop_vlan *vl;
 204         u16 vid;
 205
 206         dev_dbg(ds->dev, "%s\n", __func__);
 207
 208         /* Just do a sleeping operation to make lockdep checks effective */
 209         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 210
 211         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 212                 vl = &ps->vlans[vid];
 213
 214                 vl->members |= BIT(port);
 215                 if (untagged)
 216                         vl->untagged |= BIT(port);
 217                 else
 218                         vl->untagged &= ~BIT(port);
 219         }
 220
 221         if (pvid)
 222                 ps->pvid = vid;
 223 }
 224
 225 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
 226                                   const struct switchdev_obj_port_vlan *vlan)
 227 {
 228         bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 229         struct dsa_loop_priv *ps = ds->priv;
 230         struct mii_bus *bus = ps->bus;
 231         struct dsa_loop_vlan *vl;
 232         u16 vid, pvid = ps->pvid;
 233
 234         dev_dbg(ds->dev, "%s\n", __func__);
 235
 236         /* Just do a sleeping operation to make lockdep checks effective */
 237         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 238
 239         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 240                 vl = &ps->vlans[vid];
 241
 242                 vl->members &= ~BIT(port);
 243                 if (untagged)
 244                         vl->untagged &= ~BIT(port);
 245
 246                 if (pvid == vid)
 247                         pvid = 1;
 248         }
 249         ps->pvid = pvid;
 250
 251         return 0;
 252 }
 253
 254 static const struct dsa_switch_ops dsa_loop_driver = {
 255         .get_tag_protocol       = dsa_loop_get_protocol,
 256         .setup                  = dsa_loop_setup,
 257         .get_strings            = dsa_loop_get_strings,
 258         .get_ethtool_stats      = dsa_loop_get_ethtool_stats,
 259         .get_sset_count         = dsa_loop_get_sset_count,
 260         .phy_read               = dsa_loop_phy_read,
 261         .phy_write              = dsa_loop_phy_write,
 262         .port_bridge_join       = dsa_loop_port_bridge_join,
 263         .port_bridge_leave      = dsa_loop_port_bridge_leave,
 264         .port_stp_state_set     = dsa_loop_port_stp_state_set,
 265         .port_vlan_filtering    = dsa_loop_port_vlan_filtering,
 266         .port_vlan_prepare      = dsa_loop_port_vlan_prepare,
 267         .port_vlan_add          = dsa_loop_port_vlan_add,
 268         .port_vlan_del          = dsa_loop_port_vlan_del,
 269 };
 270
 271 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
 272 {
 273         struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
 274         struct dsa_loop_priv *ps;
 275         struct dsa_switch *ds;
 276
 277         if (!pdata)
 278                 return -ENODEV;
 279
 280         dev_info(&mdiodev->dev, "%s: 0x%0x\n",
 281                  pdata->name, pdata->enabled_ports);
 282
 283         ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
 284         if (!ds)
 285                 return -ENOMEM;
 286
 287         ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
 288         if (!ps)
 289                 return -ENOMEM;
 290
 291         ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
 292         if (!ps->netdev)
 293                 return -EPROBE_DEFER;
 294
 295         pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
 296
 297         ds->dev = &mdiodev->dev;
 298         ds->ops = &dsa_loop_driver;
 299         ds->priv = ps;
 300         ps->bus = mdiodev->bus;
 301
 302         dev_set_drvdata(&mdiodev->dev, ds);
 303
 304         return dsa_register_switch(ds);
 305 }
 306
 307 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
 308 {
 309         struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 310         struct dsa_loop_priv *ps = ds->priv;
 311
 312         dsa_unregister_switch(ds);
 313         dev_put(ps->netdev);
 314 }
 315
 316 static struct mdio_driver dsa_loop_drv = {
 317         .mdiodrv.driver = {
 318                 .name   = "dsa-loop",
 319         },
 320         .probe  = dsa_loop_drv_probe,
 321         .remove = dsa_loop_drv_remove,
 322 };
 323
 324 #define NUM_FIXED_PHYS  (DSA_LOOP_NUM_PORTS - 2)
 325
 326 static int __init dsa_loop_init(void)
 327 {
 328         struct fixed_phy_status status = {
 329                 .link = 1,
 330                 .speed = SPEED_100,
 331                 .duplex = DUPLEX_FULL,
 332         };
 333         unsigned int i;
 334
 335         for (i = 0; i < NUM_FIXED_PHYS; i++)
 336                 phydevs[i] = fixed_phy_register(PHY_POLL, &status, -1, NULL);
 337
 338         return mdio_driver_register(&dsa_loop_drv);
 339 }
 340 module_init(dsa_loop_init);
 341
 342 static void __exit dsa_loop_exit(void)
 343 {
 344         unsigned int i;
 345
 346         mdio_driver_unregister(&dsa_loop_drv);
 347         for (i = 0; i < NUM_FIXED_PHYS; i++)
 348                 if (!IS_ERR(phydevs[i]))
 349                         fixed_phy_unregister(phydevs[i]);
 350 }
 351 module_exit(dsa_loop_exit);
 352
 353 MODULE_LICENSE("GPL");
 354 MODULE_AUTHOR("Florian Fainelli");
 355 MODULE_DESCRIPTION("DSA loopback driver");