net/dsa/slave.c

   1 /*
   2  * net/dsa/slave.c - Slave device handling
   3  * Copyright (c) 2008-2009 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->phys_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->phys_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, "dsa-%d:%.2x",
  45                         ds->index, 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_init(struct net_device *dev)
  52 {
  53         struct dsa_slave_priv *p = netdev_priv(dev);
  54
  55         dev->iflink = p->parent->dst->master_netdev->ifindex;
  56
  57         return 0;
  58 }
  59
  60 static int dsa_slave_open(struct net_device *dev)
  61 {
  62         struct dsa_slave_priv *p = netdev_priv(dev);
  63         struct net_device *master = p->parent->dst->master_netdev;
  64         int err;
  65
  66         if (!(master->flags & IFF_UP))
  67                 return -ENETDOWN;
  68
  69         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  70                 err = dev_uc_add(master, dev->dev_addr);
  71                 if (err < 0)
  72                         goto out;
  73         }
  74
  75         if (dev->flags & IFF_ALLMULTI) {
  76                 err = dev_set_allmulti(master, 1);
  77                 if (err < 0)
  78                         goto del_unicast;
  79         }
  80         if (dev->flags & IFF_PROMISC) {
  81                 err = dev_set_promiscuity(master, 1);
  82                 if (err < 0)
  83                         goto clear_allmulti;
  84         }
  85
  86         return 0;
  87
  88 clear_allmulti:
  89         if (dev->flags & IFF_ALLMULTI)
  90                 dev_set_allmulti(master, -1);
  91 del_unicast:
  92         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
  93                 dev_uc_del(master, dev->dev_addr);
  94 out:
  95         return err;
  96 }
  97
  98 static int dsa_slave_close(struct net_device *dev)
  99 {
 100         struct dsa_slave_priv *p = netdev_priv(dev);
 101         struct net_device *master = p->parent->dst->master_netdev;
 102
 103         dev_mc_unsync(master, dev);
 104         dev_uc_unsync(master, dev);
 105         if (dev->flags & IFF_ALLMULTI)
 106                 dev_set_allmulti(master, -1);
 107         if (dev->flags & IFF_PROMISC)
 108                 dev_set_promiscuity(master, -1);
 109
 110         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 111                 dev_uc_del(master, dev->dev_addr);
 112
 113         return 0;
 114 }
 115
 116 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 117 {
 118         struct dsa_slave_priv *p = netdev_priv(dev);
 119         struct net_device *master = p->parent->dst->master_netdev;
 120
 121         if (change & IFF_ALLMULTI)
 122                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 123         if (change & IFF_PROMISC)
 124                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 125 }
 126
 127 static void dsa_slave_set_rx_mode(struct net_device *dev)
 128 {
 129         struct dsa_slave_priv *p = netdev_priv(dev);
 130         struct net_device *master = p->parent->dst->master_netdev;
 131
 132         dev_mc_sync(master, dev);
 133         dev_uc_sync(master, dev);
 134 }
 135
 136 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 137 {
 138         struct dsa_slave_priv *p = netdev_priv(dev);
 139         struct net_device *master = p->parent->dst->master_netdev;
 140         struct sockaddr *addr = a;
 141         int err;
 142
 143         if (!is_valid_ether_addr(addr->sa_data))
 144                 return -EADDRNOTAVAIL;
 145
 146         if (!(dev->flags & IFF_UP))
 147                 goto out;
 148
 149         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 150                 err = dev_uc_add(master, addr->sa_data);
 151                 if (err < 0)
 152                         return err;
 153         }
 154
 155         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 156                 dev_uc_del(master, dev->dev_addr);
 157
 158 out:
 159         ether_addr_copy(dev->dev_addr, addr->sa_data);
 160
 161         return 0;
 162 }
 163
 164 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 165 {
 166         struct dsa_slave_priv *p = netdev_priv(dev);
 167
 168         if (p->phy != NULL)
 169                 return phy_mii_ioctl(p->phy, ifr, cmd);
 170
 171         return -EOPNOTSUPP;
 172 }
 173
 174 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 175 {
 176         struct dsa_slave_priv *p = netdev_priv(dev);
 177         struct dsa_switch_tree *dst = p->parent->dst;
 178
 179         return dst->ops->xmit(skb, dev);
 180 }
 181
 182
 183 /* ethtool operations *******************************************************/
 184 static int
 185 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 186 {
 187         struct dsa_slave_priv *p = netdev_priv(dev);
 188         int err;
 189
 190         err = -EOPNOTSUPP;
 191         if (p->phy != NULL) {
 192                 err = phy_read_status(p->phy);
 193                 if (err == 0)
 194                         err = phy_ethtool_gset(p->phy, cmd);
 195         }
 196
 197         return err;
 198 }
 199
 200 static int
 201 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 202 {
 203         struct dsa_slave_priv *p = netdev_priv(dev);
 204
 205         if (p->phy != NULL)
 206                 return phy_ethtool_sset(p->phy, cmd);
 207
 208         return -EOPNOTSUPP;
 209 }
 210
 211 static void dsa_slave_get_drvinfo(struct net_device *dev,
 212                                   struct ethtool_drvinfo *drvinfo)
 213 {
 214         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 215         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 216         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 217         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 218 }
 219
 220 static int dsa_slave_nway_reset(struct net_device *dev)
 221 {
 222         struct dsa_slave_priv *p = netdev_priv(dev);
 223
 224         if (p->phy != NULL)
 225                 return genphy_restart_aneg(p->phy);
 226
 227         return -EOPNOTSUPP;
 228 }
 229
 230 static u32 dsa_slave_get_link(struct net_device *dev)
 231 {
 232         struct dsa_slave_priv *p = netdev_priv(dev);
 233
 234         if (p->phy != NULL) {
 235                 genphy_update_link(p->phy);
 236                 return p->phy->link;
 237         }
 238
 239         return -EOPNOTSUPP;
 240 }
 241
 242 static void dsa_slave_get_strings(struct net_device *dev,
 243                                   uint32_t stringset, uint8_t *data)
 244 {
 245         struct dsa_slave_priv *p = netdev_priv(dev);
 246         struct dsa_switch *ds = p->parent;
 247
 248         if (stringset == ETH_SS_STATS) {
 249                 int len = ETH_GSTRING_LEN;
 250
 251                 strncpy(data, "tx_packets", len);
 252                 strncpy(data + len, "tx_bytes", len);
 253                 strncpy(data + 2 * len, "rx_packets", len);
 254                 strncpy(data + 3 * len, "rx_bytes", len);
 255                 if (ds->drv->get_strings != NULL)
 256                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 257         }
 258 }
 259
 260 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 261                                         struct ethtool_stats *stats,
 262                                         uint64_t *data)
 263 {
 264         struct dsa_slave_priv *p = netdev_priv(dev);
 265         struct dsa_switch *ds = p->parent;
 266
 267         data[0] = p->dev->stats.tx_packets;
 268         data[1] = p->dev->stats.tx_bytes;
 269         data[2] = p->dev->stats.rx_packets;
 270         data[3] = p->dev->stats.rx_bytes;
 271         if (ds->drv->get_ethtool_stats != NULL)
 272                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 273 }
 274
 275 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 276 {
 277         struct dsa_slave_priv *p = netdev_priv(dev);
 278         struct dsa_switch *ds = p->parent;
 279
 280         if (sset == ETH_SS_STATS) {
 281                 int count;
 282
 283                 count = 4;
 284                 if (ds->drv->get_sset_count != NULL)
 285                         count += ds->drv->get_sset_count(ds);
 286
 287                 return count;
 288         }
 289
 290         return -EOPNOTSUPP;
 291 }
 292
 293 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 294         .get_settings           = dsa_slave_get_settings,
 295         .set_settings           = dsa_slave_set_settings,
 296         .get_drvinfo            = dsa_slave_get_drvinfo,
 297         .nway_reset             = dsa_slave_nway_reset,
 298         .get_link               = dsa_slave_get_link,
 299         .get_strings            = dsa_slave_get_strings,
 300         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 301         .get_sset_count         = dsa_slave_get_sset_count,
 302 };
 303
 304 static const struct net_device_ops dsa_slave_netdev_ops = {
 305         .ndo_init               = dsa_slave_init,
 306         .ndo_open               = dsa_slave_open,
 307         .ndo_stop               = dsa_slave_close,
 308         .ndo_start_xmit         = dsa_slave_xmit,
 309         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 310         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 311         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 312         .ndo_do_ioctl           = dsa_slave_ioctl,
 313 };
 314
 315 /* slave device setup *******************************************************/
 316 struct net_device *
 317 dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 318                  int port, char *name)
 319 {
 320         struct net_device *master = ds->dst->master_netdev;
 321         struct net_device *slave_dev;
 322         struct dsa_slave_priv *p;
 323         int ret;
 324
 325         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
 326                                  NET_NAME_UNKNOWN, ether_setup);
 327         if (slave_dev == NULL)
 328                 return slave_dev;
 329
 330         slave_dev->features = master->vlan_features;
 331         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
 332         eth_hw_addr_inherit(slave_dev, master);
 333         slave_dev->tx_queue_len = 0;
 334         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
 335
 336         switch (ds->dst->tag_protocol) {
 337 #ifdef CONFIG_NET_DSA_TAG_DSA
 338         case htons(ETH_P_DSA):
 339                 ds->dst->ops = &dsa_netdev_ops;
 340                 break;
 341 #endif
 342 #ifdef CONFIG_NET_DSA_TAG_EDSA
 343         case htons(ETH_P_EDSA):
 344                 ds->dst->ops = &edsa_netdev_ops;
 345                 break;
 346 #endif
 347 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 348         case htons(ETH_P_TRAILER):
 349                 ds->dst->ops = &trailer_netdev_ops;
 350                 break;
 351 #endif
 352         default:
 353                 BUG();
 354         }
 355
 356         SET_NETDEV_DEV(slave_dev, parent);
 357         slave_dev->dev.of_node = ds->pd->port_dn[port];
 358         slave_dev->vlan_features = master->vlan_features;
 359
 360         p = netdev_priv(slave_dev);
 361         p->dev = slave_dev;
 362         p->parent = ds;
 363         p->port = port;
 364         p->phy = ds->slave_mii_bus->phy_map[port];
 365
 366         ret = register_netdev(slave_dev);
 367         if (ret) {
 368                 printk(KERN_ERR "%s: error %d registering interface %s\n",
 369                                 master->name, ret, slave_dev->name);
 370                 free_netdev(slave_dev);
 371                 return NULL;
 372         }
 373
 374         netif_carrier_off(slave_dev);
 375
 376         if (p->phy != NULL) {
 377                 phy_attach(slave_dev, dev_name(&p->phy->dev),
 378                            PHY_INTERFACE_MODE_GMII);
 379
 380                 p->phy->autoneg = AUTONEG_ENABLE;
 381                 p->phy->speed = 0;
 382                 p->phy->duplex = 0;
 383                 p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
 384                 phy_start_aneg(p->phy);
 385         }
 386
 387         return slave_dev;
 388 }