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   1 /*
   2  * net/dsa/slave.c - Slave device handling
   3  * Copyright (c) 2008 Marvell Semiconductor
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/list.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/etherdevice.h>
  14 #include <linux/phy.h>
  15 #include "dsa_priv.h"
  16
  17 /* slave mii_bus handling ***************************************************/
  18 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  19 {
  20         struct dsa_switch *ds = bus->priv;
  21
  22         if (ds->valid_port_mask & (1 << addr))
  23                 return ds->drv->phy_read(ds, addr, reg);
  24
  25         return 0xffff;
  26 }
  27
  28 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  29 {
  30         struct dsa_switch *ds = bus->priv;
  31
  32         if (ds->valid_port_mask & (1 << addr))
  33                 return ds->drv->phy_write(ds, addr, reg, val);
  34
  35         return 0;
  36 }
  37
  38 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  39 {
  40         ds->slave_mii_bus->priv = (void *)ds;
  41         ds->slave_mii_bus->name = "dsa slave smi";
  42         ds->slave_mii_bus->read = dsa_slave_phy_read;
  43         ds->slave_mii_bus->write = dsa_slave_phy_write;
  44         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "%s:%.2x",
  45                         ds->master_mii_bus->id, ds->pd->sw_addr);
  46         ds->slave_mii_bus->parent = &(ds->master_mii_bus->dev);
  47 }
  48
  49
  50 /* slave device handling ****************************************************/
  51 static int dsa_slave_open(struct net_device *dev)
  52 {
  53         struct dsa_slave_priv *p = netdev_priv(dev);
  54         struct net_device *master = p->parent->master_netdev;
  55         int err;
  56
  57         if (!(master->flags & IFF_UP))
  58                 return -ENETDOWN;
  59
  60         if (compare_ether_addr(dev->dev_addr, master->dev_addr)) {
  61                 err = dev_unicast_add(master, dev->dev_addr, ETH_ALEN);
  62                 if (err < 0)
  63                         goto out;
  64         }
  65
  66         if (dev->flags & IFF_ALLMULTI) {
  67                 err = dev_set_allmulti(master, 1);
  68                 if (err < 0)
  69                         goto del_unicast;
  70         }
  71         if (dev->flags & IFF_PROMISC) {
  72                 err = dev_set_promiscuity(master, 1);
  73                 if (err < 0)
  74                         goto clear_allmulti;
  75         }
  76
  77         return 0;
  78
  79 clear_allmulti:
  80         if (dev->flags & IFF_ALLMULTI)
  81                 dev_set_allmulti(master, -1);
  82 del_unicast:
  83         if (compare_ether_addr(dev->dev_addr, master->dev_addr))
  84                 dev_unicast_delete(master, dev->dev_addr, ETH_ALEN);
  85 out:
  86         return err;
  87 }
  88
  89 static int dsa_slave_close(struct net_device *dev)
  90 {
  91         struct dsa_slave_priv *p = netdev_priv(dev);
  92         struct net_device *master = p->parent->master_netdev;
  93
  94         dev_mc_unsync(master, dev);
  95         dev_unicast_unsync(master, dev);
  96         if (dev->flags & IFF_ALLMULTI)
  97                 dev_set_allmulti(master, -1);
  98         if (dev->flags & IFF_PROMISC)
  99                 dev_set_promiscuity(master, -1);
 100
 101         if (compare_ether_addr(dev->dev_addr, master->dev_addr))
 102                 dev_unicast_delete(master, dev->dev_addr, ETH_ALEN);
 103
 104         return 0;
 105 }
 106
 107 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 108 {
 109         struct dsa_slave_priv *p = netdev_priv(dev);
 110         struct net_device *master = p->parent->master_netdev;
 111
 112         if (change & IFF_ALLMULTI)
 113                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 114         if (change & IFF_PROMISC)
 115                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 116 }
 117
 118 static void dsa_slave_set_rx_mode(struct net_device *dev)
 119 {
 120         struct dsa_slave_priv *p = netdev_priv(dev);
 121         struct net_device *master = p->parent->master_netdev;
 122
 123         dev_mc_sync(master, dev);
 124         dev_unicast_sync(master, dev);
 125 }
 126
 127 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 128 {
 129         struct dsa_slave_priv *p = netdev_priv(dev);
 130         struct net_device *master = p->parent->master_netdev;
 131         struct sockaddr *addr = a;
 132         int err;
 133
 134         if (!is_valid_ether_addr(addr->sa_data))
 135                 return -EADDRNOTAVAIL;
 136
 137         if (!(dev->flags & IFF_UP))
 138                 goto out;
 139
 140         if (compare_ether_addr(addr->sa_data, master->dev_addr)) {
 141                 err = dev_unicast_add(master, addr->sa_data, ETH_ALEN);
 142                 if (err < 0)
 143                         return err;
 144         }
 145
 146         if (compare_ether_addr(dev->dev_addr, master->dev_addr))
 147                 dev_unicast_delete(master, dev->dev_addr, ETH_ALEN);
 148
 149 out:
 150         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 151
 152         return 0;
 153 }
 154
 155 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 156 {
 157         struct dsa_slave_priv *p = netdev_priv(dev);
 158         struct mii_ioctl_data *mii_data = if_mii(ifr);
 159
 160         if (p->phy != NULL)
 161                 return phy_mii_ioctl(p->phy, mii_data, cmd);
 162
 163         return -EOPNOTSUPP;
 164 }
 165
 166
 167 /* ethtool operations *******************************************************/
 168 static int
 169 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 170 {
 171         struct dsa_slave_priv *p = netdev_priv(dev);
 172         int err;
 173
 174         err = -EOPNOTSUPP;
 175         if (p->phy != NULL) {
 176                 err = phy_read_status(p->phy);
 177                 if (err == 0)
 178                         err = phy_ethtool_gset(p->phy, cmd);
 179         }
 180
 181         return err;
 182 }
 183
 184 static int
 185 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 186 {
 187         struct dsa_slave_priv *p = netdev_priv(dev);
 188
 189         if (p->phy != NULL)
 190                 return phy_ethtool_sset(p->phy, cmd);
 191
 192         return -EOPNOTSUPP;
 193 }
 194
 195 static void dsa_slave_get_drvinfo(struct net_device *dev,
 196                                   struct ethtool_drvinfo *drvinfo)
 197 {
 198         strncpy(drvinfo->driver, "dsa", 32);
 199         strncpy(drvinfo->version, dsa_driver_version, 32);
 200         strncpy(drvinfo->fw_version, "N/A", 32);
 201         strncpy(drvinfo->bus_info, "platform", 32);
 202 }
 203
 204 static int dsa_slave_nway_reset(struct net_device *dev)
 205 {
 206         struct dsa_slave_priv *p = netdev_priv(dev);
 207
 208         if (p->phy != NULL)
 209                 return genphy_restart_aneg(p->phy);
 210
 211         return -EOPNOTSUPP;
 212 }
 213
 214 static u32 dsa_slave_get_link(struct net_device *dev)
 215 {
 216         struct dsa_slave_priv *p = netdev_priv(dev);
 217
 218         if (p->phy != NULL) {
 219                 genphy_update_link(p->phy);
 220                 return p->phy->link;
 221         }
 222
 223         return -EOPNOTSUPP;
 224 }
 225
 226 static void dsa_slave_get_strings(struct net_device *dev,
 227                                   uint32_t stringset, uint8_t *data)
 228 {
 229         struct dsa_slave_priv *p = netdev_priv(dev);
 230         struct dsa_switch *ds = p->parent;
 231
 232         if (stringset == ETH_SS_STATS) {
 233                 int len = ETH_GSTRING_LEN;
 234
 235                 strncpy(data, "tx_packets", len);
 236                 strncpy(data + len, "tx_bytes", len);
 237                 strncpy(data + 2 * len, "rx_packets", len);
 238                 strncpy(data + 3 * len, "rx_bytes", len);
 239                 if (ds->drv->get_strings != NULL)
 240                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 241         }
 242 }
 243
 244 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 245                                         struct ethtool_stats *stats,
 246                                         uint64_t *data)
 247 {
 248         struct dsa_slave_priv *p = netdev_priv(dev);
 249         struct dsa_switch *ds = p->parent;
 250
 251         data[0] = p->dev->stats.tx_packets;
 252         data[1] = p->dev->stats.tx_bytes;
 253         data[2] = p->dev->stats.rx_packets;
 254         data[3] = p->dev->stats.rx_bytes;
 255         if (ds->drv->get_ethtool_stats != NULL)
 256                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 257 }
 258
 259 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 260 {
 261         struct dsa_slave_priv *p = netdev_priv(dev);
 262         struct dsa_switch *ds = p->parent;
 263
 264         if (sset == ETH_SS_STATS) {
 265                 int count;
 266
 267                 count = 4;
 268                 if (ds->drv->get_sset_count != NULL)
 269                         count += ds->drv->get_sset_count(ds);
 270
 271                 return count;
 272         }
 273
 274         return -EOPNOTSUPP;
 275 }
 276
 277 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 278         .get_settings           = dsa_slave_get_settings,
 279         .set_settings           = dsa_slave_set_settings,
 280         .get_drvinfo            = dsa_slave_get_drvinfo,
 281         .nway_reset             = dsa_slave_nway_reset,
 282         .get_link               = dsa_slave_get_link,
 283         .set_sg                 = ethtool_op_set_sg,
 284         .get_strings            = dsa_slave_get_strings,
 285         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 286         .get_sset_count         = dsa_slave_get_sset_count,
 287 };
 288
 289
 290 /* slave device setup *******************************************************/
 291 struct net_device *
 292 dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 293                  int port, char *name)
 294 {
 295         struct net_device *master = ds->master_netdev;
 296         struct net_device *slave_dev;
 297         struct dsa_slave_priv *p;
 298         int ret;
 299
 300         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv),
 301                                  name, ether_setup);
 302         if (slave_dev == NULL)
 303                 return slave_dev;
 304
 305         slave_dev->features = master->vlan_features;
 306         SET_ETHTOOL_OPS(slave_dev, &dsa_slave_ethtool_ops);
 307         memcpy(slave_dev->dev_addr, master->dev_addr, ETH_ALEN);
 308         slave_dev->tx_queue_len = 0;
 309         switch (ds->tag_protocol) {
 310 #ifdef CONFIG_NET_DSA_TAG_DSA
 311         case htons(ETH_P_DSA):
 312                 slave_dev->hard_start_xmit = dsa_xmit;
 313                 break;
 314 #endif
 315 #ifdef CONFIG_NET_DSA_TAG_EDSA
 316         case htons(ETH_P_EDSA):
 317                 slave_dev->hard_start_xmit = edsa_xmit;
 318                 break;
 319 #endif
 320 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 321         case htons(ETH_P_TRAILER):
 322                 slave_dev->hard_start_xmit = trailer_xmit;
 323                 break;
 324 #endif
 325         default:
 326                 BUG();
 327         }
 328         slave_dev->open = dsa_slave_open;
 329         slave_dev->stop = dsa_slave_close;
 330         slave_dev->change_rx_flags = dsa_slave_change_rx_flags;
 331         slave_dev->set_rx_mode = dsa_slave_set_rx_mode;
 332         slave_dev->set_multicast_list = dsa_slave_set_rx_mode;
 333         slave_dev->set_mac_address = dsa_slave_set_mac_address;
 334         slave_dev->do_ioctl = dsa_slave_ioctl;
 335         SET_NETDEV_DEV(slave_dev, parent);
 336         slave_dev->vlan_features = master->vlan_features;
 337
 338         p = netdev_priv(slave_dev);
 339         p->dev = slave_dev;
 340         p->parent = ds;
 341         p->port = port;
 342         p->phy = ds->slave_mii_bus->phy_map[port];
 343
 344         ret = register_netdev(slave_dev);
 345         if (ret) {
 346                 printk(KERN_ERR "%s: error %d registering interface %s\n",
 347                                 master->name, ret, slave_dev->name);
 348                 free_netdev(slave_dev);
 349                 return NULL;
 350         }
 351
 352         netif_carrier_off(slave_dev);
 353
 354         if (p->phy != NULL) {
 355                 phy_attach(slave_dev, dev_name(&p->phy->dev),
 356                            0, PHY_INTERFACE_MODE_GMII);
 357
 358                 p->phy->autoneg = AUTONEG_ENABLE;
 359                 p->phy->speed = 0;
 360                 p->phy->duplex = 0;
 361                 p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
 362                 phy_start_aneg(p->phy);
 363         }
 364
 365         return slave_dev;
 366 }