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 <[email protected]>
   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 <linux/dsa/loop.h>
  18 #include <net/dsa.h>
  19
  20 #include "dsa_loop.h"
  21
  22 static struct dsa_loop_mib_entry dsa_loop_mibs[] = {
  23         [DSA_LOOP_PHY_READ_OK]  = { "phy_read_ok", },
  24         [DSA_LOOP_PHY_READ_ERR] = { "phy_read_err", },
  25         [DSA_LOOP_PHY_WRITE_OK] = { "phy_write_ok", },
  26         [DSA_LOOP_PHY_WRITE_ERR] = { "phy_write_err", },
  27 };
  28
  29 static struct phy_device *phydevs[PHY_MAX_ADDR];
  30
  31 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds,
  32                                                    int port,
  33                                                    enum dsa_tag_protocol mp)
  34 {
  35         dev_dbg(ds->dev, "%s: port: %d\n", __func__, port);
  36
  37         return DSA_TAG_PROTO_NONE;
  38 }
  39
  40 static int dsa_loop_setup(struct dsa_switch *ds)
  41 {
  42         struct dsa_loop_priv *ps = ds->priv;
  43         unsigned int i;
  44
  45         for (i = 0; i < ds->num_ports; i++)
  46                 memcpy(ps->ports[i].mib, dsa_loop_mibs,
  47                        sizeof(dsa_loop_mibs));
  48
  49         dev_dbg(ds->dev, "%s\n", __func__);
  50
  51         return 0;
  52 }
  53
  54 static int dsa_loop_get_sset_count(struct dsa_switch *ds, int port, int sset)
  55 {
  56         if (sset != ETH_SS_STATS && sset != ETH_SS_PHY_STATS)
  57                 return 0;
  58
  59         return __DSA_LOOP_CNT_MAX;
  60 }
  61
  62 static void dsa_loop_get_strings(struct dsa_switch *ds, int port,
  63                                  u32 stringset, uint8_t *data)
  64 {
  65         struct dsa_loop_priv *ps = ds->priv;
  66         unsigned int i;
  67
  68         if (stringset != ETH_SS_STATS && stringset != ETH_SS_PHY_STATS)
  69                 return;
  70
  71         for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
  72                 memcpy(data + i * ETH_GSTRING_LEN,
  73                        ps->ports[port].mib[i].name, ETH_GSTRING_LEN);
  74 }
  75
  76 static void dsa_loop_get_ethtool_stats(struct dsa_switch *ds, int port,
  77                                        uint64_t *data)
  78 {
  79         struct dsa_loop_priv *ps = ds->priv;
  80         unsigned int i;
  81
  82         for (i = 0; i < __DSA_LOOP_CNT_MAX; i++)
  83                 data[i] = ps->ports[port].mib[i].val;
  84 }
  85
  86 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
  87 {
  88         struct dsa_loop_priv *ps = ds->priv;
  89         struct mii_bus *bus = ps->bus;
  90         int ret;
  91
  92         ret = mdiobus_read_nested(bus, ps->port_base + port, regnum);
  93         if (ret < 0)
  94                 ps->ports[port].mib[DSA_LOOP_PHY_READ_ERR].val++;
  95         else
  96                 ps->ports[port].mib[DSA_LOOP_PHY_READ_OK].val++;
  97
  98         return ret;
  99 }
 100
 101 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
 102                               int regnum, u16 value)
 103 {
 104         struct dsa_loop_priv *ps = ds->priv;
 105         struct mii_bus *bus = ps->bus;
 106         int ret;
 107
 108         ret = mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
 109         if (ret < 0)
 110                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_ERR].val++;
 111         else
 112                 ps->ports[port].mib[DSA_LOOP_PHY_WRITE_OK].val++;
 113
 114         return ret;
 115 }
 116
 117 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
 118                                      struct net_device *bridge)
 119 {
 120         dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
 121                 __func__, port, bridge->name);
 122
 123         return 0;
 124 }
 125
 126 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
 127                                        struct net_device *bridge)
 128 {
 129         dev_dbg(ds->dev, "%s: port: %d, bridge: %s\n",
 130                 __func__, port, bridge->name);
 131 }
 132
 133 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
 134                                         u8 state)
 135 {
 136         dev_dbg(ds->dev, "%s: port: %d, state: %d\n",
 137                 __func__, port, state);
 138 }
 139
 140 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
 141                                         bool vlan_filtering)
 142 {
 143         dev_dbg(ds->dev, "%s: port: %d, vlan_filtering: %d\n",
 144                 __func__, port, vlan_filtering);
 145
 146         return 0;
 147 }
 148
 149 static int
 150 dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
 151                            const struct switchdev_obj_port_vlan *vlan)
 152 {
 153         struct dsa_loop_priv *ps = ds->priv;
 154         struct mii_bus *bus = ps->bus;
 155
 156         dev_dbg(ds->dev, "%s: port: %d, vlan: %d-%d",
 157                 __func__, port, vlan->vid_begin, vlan->vid_end);
 158
 159         /* Just do a sleeping operation to make lockdep checks effective */
 160         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 161
 162         if (vlan->vid_end > ARRAY_SIZE(ps->vlans))
 163                 return -ERANGE;
 164
 165         return 0;
 166 }
 167
 168 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
 169                                    const struct switchdev_obj_port_vlan *vlan)
 170 {
 171         bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 172         bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
 173         struct dsa_loop_priv *ps = ds->priv;
 174         struct mii_bus *bus = ps->bus;
 175         struct dsa_loop_vlan *vl;
 176         u16 vid;
 177
 178         /* Just do a sleeping operation to make lockdep checks effective */
 179         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 180
 181         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 182                 vl = &ps->vlans[vid];
 183
 184                 vl->members |= BIT(port);
 185                 if (untagged)
 186                         vl->untagged |= BIT(port);
 187                 else
 188                         vl->untagged &= ~BIT(port);
 189
 190                 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
 191                         __func__, port, vid, untagged ? "un" : "", pvid);
 192         }
 193
 194         if (pvid)
 195                 ps->ports[port].pvid = vid;
 196 }
 197
 198 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
 199                                   const struct switchdev_obj_port_vlan *vlan)
 200 {
 201         bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 202         struct dsa_loop_priv *ps = ds->priv;
 203         struct mii_bus *bus = ps->bus;
 204         struct dsa_loop_vlan *vl;
 205         u16 vid, pvid = ps->ports[port].pvid;
 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
 217                 if (pvid == vid)
 218                         pvid = 1;
 219
 220                 dev_dbg(ds->dev, "%s: port: %d vlan: %d, %stagged, pvid: %d\n",
 221                         __func__, port, vid, untagged ? "un" : "", pvid);
 222         }
 223         ps->ports[port].pvid = pvid;
 224
 225         return 0;
 226 }
 227
 228 static int dsa_loop_port_change_mtu(struct dsa_switch *ds, int port,
 229                                     int new_mtu)
 230 {
 231         struct dsa_loop_priv *priv = ds->priv;
 232
 233         priv->ports[port].mtu = new_mtu;
 234
 235         return 0;
 236 }
 237
 238 static int dsa_loop_port_max_mtu(struct dsa_switch *ds, int port)
 239 {
 240         return ETH_MAX_MTU;
 241 }
 242
 243 static const struct dsa_switch_ops dsa_loop_driver = {
 244         .get_tag_protocol       = dsa_loop_get_protocol,
 245         .setup                  = dsa_loop_setup,
 246         .get_strings            = dsa_loop_get_strings,
 247         .get_ethtool_stats      = dsa_loop_get_ethtool_stats,
 248         .get_sset_count         = dsa_loop_get_sset_count,
 249         .get_ethtool_phy_stats  = dsa_loop_get_ethtool_stats,
 250         .phy_read               = dsa_loop_phy_read,
 251         .phy_write              = dsa_loop_phy_write,
 252         .port_bridge_join       = dsa_loop_port_bridge_join,
 253         .port_bridge_leave      = dsa_loop_port_bridge_leave,
 254         .port_stp_state_set     = dsa_loop_port_stp_state_set,
 255         .port_vlan_filtering    = dsa_loop_port_vlan_filtering,
 256         .port_vlan_prepare      = dsa_loop_port_vlan_prepare,
 257         .port_vlan_add          = dsa_loop_port_vlan_add,
 258         .port_vlan_del          = dsa_loop_port_vlan_del,
 259         .port_change_mtu        = dsa_loop_port_change_mtu,
 260         .port_max_mtu           = dsa_loop_port_max_mtu,
 261 };
 262
 263 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
 264 {
 265         struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
 266         struct dsa_loop_priv *ps;
 267         struct dsa_switch *ds;
 268         int ret;
 269
 270         if (!pdata)
 271                 return -ENODEV;
 272
 273         ds = devm_kzalloc(&mdiodev->dev, sizeof(*ds), GFP_KERNEL);
 274         if (!ds)
 275                 return -ENOMEM;
 276
 277         ds->dev = &mdiodev->dev;
 278         ds->num_ports = DSA_LOOP_NUM_PORTS;
 279
 280         ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
 281         if (!ps)
 282                 return -ENOMEM;
 283
 284         ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
 285         if (!ps->netdev)
 286                 return -EPROBE_DEFER;
 287
 288         pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
 289
 290         ds->dev = &mdiodev->dev;
 291         ds->ops = &dsa_loop_driver;
 292         ds->priv = ps;
 293         ps->bus = mdiodev->bus;
 294
 295         dev_set_drvdata(&mdiodev->dev, ds);
 296
 297         ret = dsa_register_switch(ds);
 298         if (!ret)
 299                 dev_info(&mdiodev->dev, "%s: 0x%0x\n",
 300                          pdata->name, pdata->enabled_ports);
 301
 302         return ret;
 303 }
 304
 305 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
 306 {
 307         struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 308         struct dsa_loop_priv *ps = ds->priv;
 309
 310         dsa_unregister_switch(ds);
 311         dev_put(ps->netdev);
 312 }
 313
 314 static struct mdio_driver dsa_loop_drv = {
 315         .mdiodrv.driver = {
 316                 .name   = "dsa-loop",
 317         },
 318         .probe  = dsa_loop_drv_probe,
 319         .remove = dsa_loop_drv_remove,
 320 };
 321
 322 #define NUM_FIXED_PHYS  (DSA_LOOP_NUM_PORTS - 2)
 323
 324 static int __init dsa_loop_init(void)
 325 {
 326         struct fixed_phy_status status = {
 327                 .link = 1,
 328                 .speed = SPEED_100,
 329                 .duplex = DUPLEX_FULL,
 330         };
 331         unsigned int i;
 332
 333         for (i = 0; i < NUM_FIXED_PHYS; i++)
 334                 phydevs[i] = fixed_phy_register(PHY_POLL, &status, NULL);
 335
 336         return mdio_driver_register(&dsa_loop_drv);
 337 }
 338 module_init(dsa_loop_init);
 339
 340 static void __exit dsa_loop_exit(void)
 341 {
 342         unsigned int i;
 343
 344         mdio_driver_unregister(&dsa_loop_drv);
 345         for (i = 0; i < NUM_FIXED_PHYS; i++)
 346                 if (!IS_ERR(phydevs[i]))
 347                         fixed_phy_unregister(phydevs[i]);
 348 }
 349 module_exit(dsa_loop_exit);
 350
 351 MODULE_SOFTDEP("pre: dsa_loop_bdinfo");
 352 MODULE_LICENSE("GPL");
 353 MODULE_AUTHOR("Florian Fainelli");
 354 MODULE_DESCRIPTION("DSA loopback driver");