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/workqueue.h>
  18 #include <linux/module.h>
  19 #include <linux/if_bridge.h>
  20 #include <net/switchdev.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 #define DSA_LOOP_VLANS  5
  31
  32 struct dsa_loop_priv {
  33         struct mii_bus  *bus;
  34         unsigned int    port_base;
  35         struct dsa_loop_vlan vlans[DSA_LOOP_VLANS];
  36         struct net_device *netdev;
  37         u16 pvid;
  38 };
  39
  40 static struct phy_device *phydevs[PHY_MAX_ADDR];
  41
  42 static enum dsa_tag_protocol dsa_loop_get_protocol(struct dsa_switch *ds)
  43 {
  44         dev_dbg(ds->dev, "%s\n", __func__);
  45
  46         return DSA_TAG_PROTO_NONE;
  47 }
  48
  49 static int dsa_loop_setup(struct dsa_switch *ds)
  50 {
  51         dev_dbg(ds->dev, "%s\n", __func__);
  52
  53         return 0;
  54 }
  55
  56 static int dsa_loop_set_addr(struct dsa_switch *ds, u8 *addr)
  57 {
  58         dev_dbg(ds->dev, "%s\n", __func__);
  59
  60         return 0;
  61 }
  62
  63 static int dsa_loop_phy_read(struct dsa_switch *ds, int port, int regnum)
  64 {
  65         struct dsa_loop_priv *ps = ds->priv;
  66         struct mii_bus *bus = ps->bus;
  67
  68         dev_dbg(ds->dev, "%s\n", __func__);
  69
  70         return mdiobus_read_nested(bus, ps->port_base + port, regnum);
  71 }
  72
  73 static int dsa_loop_phy_write(struct dsa_switch *ds, int port,
  74                               int regnum, u16 value)
  75 {
  76         struct dsa_loop_priv *ps = ds->priv;
  77         struct mii_bus *bus = ps->bus;
  78
  79         dev_dbg(ds->dev, "%s\n", __func__);
  80
  81         return mdiobus_write_nested(bus, ps->port_base + port, regnum, value);
  82 }
  83
  84 static int dsa_loop_port_bridge_join(struct dsa_switch *ds, int port,
  85                                      struct net_device *bridge)
  86 {
  87         dev_dbg(ds->dev, "%s\n", __func__);
  88
  89         return 0;
  90 }
  91
  92 static void dsa_loop_port_bridge_leave(struct dsa_switch *ds, int port,
  93                                        struct net_device *bridge)
  94 {
  95         dev_dbg(ds->dev, "%s\n", __func__);
  96 }
  97
  98 static void dsa_loop_port_stp_state_set(struct dsa_switch *ds, int port,
  99                                         u8 state)
 100 {
 101         dev_dbg(ds->dev, "%s\n", __func__);
 102 }
 103
 104 static int dsa_loop_port_vlan_filtering(struct dsa_switch *ds, int port,
 105                                         bool vlan_filtering)
 106 {
 107         dev_dbg(ds->dev, "%s\n", __func__);
 108
 109         return 0;
 110 }
 111
 112 static int dsa_loop_port_vlan_prepare(struct dsa_switch *ds, int port,
 113                                       const struct switchdev_obj_port_vlan *vlan,
 114                                       struct switchdev_trans *trans)
 115 {
 116         struct dsa_loop_priv *ps = ds->priv;
 117         struct mii_bus *bus = ps->bus;
 118
 119         dev_dbg(ds->dev, "%s\n", __func__);
 120
 121         /* Just do a sleeping operation to make lockdep checks effective */
 122         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 123
 124         if (vlan->vid_end > DSA_LOOP_VLANS)
 125                 return -ERANGE;
 126
 127         return 0;
 128 }
 129
 130 static void dsa_loop_port_vlan_add(struct dsa_switch *ds, int port,
 131                                    const struct switchdev_obj_port_vlan *vlan,
 132                                    struct switchdev_trans *trans)
 133 {
 134         bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 135         bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
 136         struct dsa_loop_priv *ps = ds->priv;
 137         struct mii_bus *bus = ps->bus;
 138         struct dsa_loop_vlan *vl;
 139         u16 vid;
 140
 141         dev_dbg(ds->dev, "%s\n", __func__);
 142
 143         /* Just do a sleeping operation to make lockdep checks effective */
 144         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 145
 146         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 147                 vl = &ps->vlans[vid];
 148
 149                 vl->members |= BIT(port);
 150                 if (untagged)
 151                         vl->untagged |= BIT(port);
 152                 else
 153                         vl->untagged &= ~BIT(port);
 154         }
 155
 156         if (pvid)
 157                 ps->pvid = vid;
 158 }
 159
 160 static int dsa_loop_port_vlan_del(struct dsa_switch *ds, int port,
 161                                   const struct switchdev_obj_port_vlan *vlan)
 162 {
 163         bool untagged = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
 164         struct dsa_loop_priv *ps = ds->priv;
 165         struct mii_bus *bus = ps->bus;
 166         struct dsa_loop_vlan *vl;
 167         u16 vid, pvid = ps->pvid;
 168
 169         dev_dbg(ds->dev, "%s\n", __func__);
 170
 171         /* Just do a sleeping operation to make lockdep checks effective */
 172         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 173
 174         for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
 175                 vl = &ps->vlans[vid];
 176
 177                 vl->members &= ~BIT(port);
 178                 if (untagged)
 179                         vl->untagged &= ~BIT(port);
 180
 181                 if (pvid == vid)
 182                         pvid = 1;
 183         }
 184         ps->pvid = pvid;
 185
 186         return 0;
 187 }
 188
 189 static int dsa_loop_port_vlan_dump(struct dsa_switch *ds, int port,
 190                                    struct switchdev_obj_port_vlan *vlan,
 191                                    int (*cb)(struct switchdev_obj *obj))
 192 {
 193         struct dsa_loop_priv *ps = ds->priv;
 194         struct mii_bus *bus = ps->bus;
 195         struct dsa_loop_vlan *vl;
 196         u16 vid, vid_start = 0;
 197         int err = 0;
 198
 199         dev_dbg(ds->dev, "%s\n", __func__);
 200
 201         /* Just do a sleeping operation to make lockdep checks effective */
 202         mdiobus_read(bus, ps->port_base + port, MII_BMSR);
 203
 204         for (vid = vid_start; vid < DSA_LOOP_VLANS; vid++) {
 205                 vl = &ps->vlans[vid];
 206
 207                 if (!(vl->members & BIT(port)))
 208                         continue;
 209
 210                 vlan->vid_begin = vlan->vid_end = vid;
 211                 vlan->flags = 0;
 212
 213                 if (vl->untagged & BIT(port))
 214                         vlan->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 215                 if (ps->pvid == vid)
 216                         vlan->flags |= BRIDGE_VLAN_INFO_PVID;
 217
 218                 err = cb(&vlan->obj);
 219                 if (err)
 220                         break;
 221         }
 222
 223         return err;
 224 }
 225
 226 static struct dsa_switch_ops dsa_loop_driver = {
 227         .get_tag_protocol       = dsa_loop_get_protocol,
 228         .setup                  = dsa_loop_setup,
 229         .set_addr               = dsa_loop_set_addr,
 230         .phy_read               = dsa_loop_phy_read,
 231         .phy_write              = dsa_loop_phy_write,
 232         .port_bridge_join       = dsa_loop_port_bridge_join,
 233         .port_bridge_leave      = dsa_loop_port_bridge_leave,
 234         .port_stp_state_set     = dsa_loop_port_stp_state_set,
 235         .port_vlan_filtering    = dsa_loop_port_vlan_filtering,
 236         .port_vlan_prepare      = dsa_loop_port_vlan_prepare,
 237         .port_vlan_add          = dsa_loop_port_vlan_add,
 238         .port_vlan_del          = dsa_loop_port_vlan_del,
 239         .port_vlan_dump         = dsa_loop_port_vlan_dump,
 240 };
 241
 242 static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
 243 {
 244         struct dsa_loop_pdata *pdata = mdiodev->dev.platform_data;
 245         struct dsa_loop_priv *ps;
 246         struct dsa_switch *ds;
 247
 248         if (!pdata)
 249                 return -ENODEV;
 250
 251         dev_info(&mdiodev->dev, "%s: 0x%0x\n",
 252                  pdata->name, pdata->enabled_ports);
 253
 254         ds = dsa_switch_alloc(&mdiodev->dev, DSA_MAX_PORTS);
 255         if (!ds)
 256                 return -ENOMEM;
 257
 258         ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
 259         ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
 260         if (!ps->netdev)
 261                 return -EPROBE_DEFER;
 262
 263         pdata->cd.netdev[DSA_LOOP_CPU_PORT] = &ps->netdev->dev;
 264
 265         ds->dev = &mdiodev->dev;
 266         ds->ops = &dsa_loop_driver;
 267         ds->priv = ps;
 268         ps->bus = mdiodev->bus;
 269
 270         dev_set_drvdata(&mdiodev->dev, ds);
 271
 272         return dsa_register_switch(ds, ds->dev);
 273 }
 274
 275 static void dsa_loop_drv_remove(struct mdio_device *mdiodev)
 276 {
 277         struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
 278         struct dsa_loop_priv *ps = ds->priv;
 279
 280         dsa_unregister_switch(ds);
 281         dev_put(ps->netdev);
 282 }
 283
 284 static struct mdio_driver dsa_loop_drv = {
 285         .mdiodrv.driver = {
 286                 .name   = "dsa-loop",
 287         },
 288         .probe  = dsa_loop_drv_probe,
 289         .remove = dsa_loop_drv_remove,
 290 };
 291
 292 #define NUM_FIXED_PHYS  (DSA_LOOP_NUM_PORTS - 2)
 293
 294 static void unregister_fixed_phys(void)
 295 {
 296         unsigned int i;
 297
 298         for (i = 0; i < NUM_FIXED_PHYS; i++)
 299                 if (phydevs[i])
 300                         fixed_phy_unregister(phydevs[i]);
 301 }
 302
 303 static int __init dsa_loop_init(void)
 304 {
 305         struct fixed_phy_status status = {
 306                 .link = 1,
 307                 .speed = SPEED_100,
 308                 .duplex = DUPLEX_FULL,
 309         };
 310         unsigned int i;
 311
 312         for (i = 0; i < NUM_FIXED_PHYS; i++)
 313                 phydevs[i] = fixed_phy_register(PHY_POLL, &status, -1, NULL);
 314
 315         return mdio_driver_register(&dsa_loop_drv);
 316 }
 317 module_init(dsa_loop_init);
 318
 319 static void __exit dsa_loop_exit(void)
 320 {
 321         mdio_driver_unregister(&dsa_loop_drv);
 322         unregister_fixed_phys();
 323 }
 324 module_exit(dsa_loop_exit);
 325
 326 MODULE_LICENSE("GPL");
 327 MODULE_AUTHOR("Florian Fainelli");
 328 MODULE_DESCRIPTION("DSA loopback driver");