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   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, "%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_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 (compare_ether_addr(dev->dev_addr, master->dev_addr)) {
  70                 err = dev_unicast_add(master, dev->dev_addr, ETH_ALEN);
  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 (compare_ether_addr(dev->dev_addr, master->dev_addr))
  93                 dev_unicast_delete(master, dev->dev_addr, ETH_ALEN);
  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_unicast_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 (compare_ether_addr(dev->dev_addr, master->dev_addr))
 111                 dev_unicast_delete(master, dev->dev_addr, ETH_ALEN);
 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_unicast_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 (compare_ether_addr(addr->sa_data, master->dev_addr)) {
 150                 err = dev_unicast_add(master, addr->sa_data, ETH_ALEN);
 151                 if (err < 0)
 152                         return err;
 153         }
 154
 155         if (compare_ether_addr(dev->dev_addr, master->dev_addr))
 156                 dev_unicast_delete(master, dev->dev_addr, ETH_ALEN);
 157
 158 out:
 159         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 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         struct mii_ioctl_data *mii_data = if_mii(ifr);
 168
 169         if (p->phy != NULL)
 170                 return phy_mii_ioctl(p->phy, mii_data, cmd);
 171
 172         return -EOPNOTSUPP;
 173 }
 174
 175
 176 /* ethtool operations *******************************************************/
 177 static int
 178 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 179 {
 180         struct dsa_slave_priv *p = netdev_priv(dev);
 181         int err;
 182
 183         err = -EOPNOTSUPP;
 184         if (p->phy != NULL) {
 185                 err = phy_read_status(p->phy);
 186                 if (err == 0)
 187                         err = phy_ethtool_gset(p->phy, cmd);
 188         }
 189
 190         return err;
 191 }
 192
 193 static int
 194 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 195 {
 196         struct dsa_slave_priv *p = netdev_priv(dev);
 197
 198         if (p->phy != NULL)
 199                 return phy_ethtool_sset(p->phy, cmd);
 200
 201         return -EOPNOTSUPP;
 202 }
 203
 204 static void dsa_slave_get_drvinfo(struct net_device *dev,
 205                                   struct ethtool_drvinfo *drvinfo)
 206 {
 207         strncpy(drvinfo->driver, "dsa", 32);
 208         strncpy(drvinfo->version, dsa_driver_version, 32);
 209         strncpy(drvinfo->fw_version, "N/A", 32);
 210         strncpy(drvinfo->bus_info, "platform", 32);
 211 }
 212
 213 static int dsa_slave_nway_reset(struct net_device *dev)
 214 {
 215         struct dsa_slave_priv *p = netdev_priv(dev);
 216
 217         if (p->phy != NULL)
 218                 return genphy_restart_aneg(p->phy);
 219
 220         return -EOPNOTSUPP;
 221 }
 222
 223 static u32 dsa_slave_get_link(struct net_device *dev)
 224 {
 225         struct dsa_slave_priv *p = netdev_priv(dev);
 226
 227         if (p->phy != NULL) {
 228                 genphy_update_link(p->phy);
 229                 return p->phy->link;
 230         }
 231
 232         return -EOPNOTSUPP;
 233 }
 234
 235 static void dsa_slave_get_strings(struct net_device *dev,
 236                                   uint32_t stringset, uint8_t *data)
 237 {
 238         struct dsa_slave_priv *p = netdev_priv(dev);
 239         struct dsa_switch *ds = p->parent;
 240
 241         if (stringset == ETH_SS_STATS) {
 242                 int len = ETH_GSTRING_LEN;
 243
 244                 strncpy(data, "tx_packets", len);
 245                 strncpy(data + len, "tx_bytes", len);
 246                 strncpy(data + 2 * len, "rx_packets", len);
 247                 strncpy(data + 3 * len, "rx_bytes", len);
 248                 if (ds->drv->get_strings != NULL)
 249                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 250         }
 251 }
 252
 253 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 254                                         struct ethtool_stats *stats,
 255                                         uint64_t *data)
 256 {
 257         struct dsa_slave_priv *p = netdev_priv(dev);
 258         struct dsa_switch *ds = p->parent;
 259
 260         data[0] = p->dev->stats.tx_packets;
 261         data[1] = p->dev->stats.tx_bytes;
 262         data[2] = p->dev->stats.rx_packets;
 263         data[3] = p->dev->stats.rx_bytes;
 264         if (ds->drv->get_ethtool_stats != NULL)
 265                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 266 }
 267
 268 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 269 {
 270         struct dsa_slave_priv *p = netdev_priv(dev);
 271         struct dsa_switch *ds = p->parent;
 272
 273         if (sset == ETH_SS_STATS) {
 274                 int count;
 275
 276                 count = 4;
 277                 if (ds->drv->get_sset_count != NULL)
 278                         count += ds->drv->get_sset_count(ds);
 279
 280                 return count;
 281         }
 282
 283         return -EOPNOTSUPP;
 284 }
 285
 286 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 287         .get_settings           = dsa_slave_get_settings,
 288         .set_settings           = dsa_slave_set_settings,
 289         .get_drvinfo            = dsa_slave_get_drvinfo,
 290         .nway_reset             = dsa_slave_nway_reset,
 291         .get_link               = dsa_slave_get_link,
 292         .set_sg                 = ethtool_op_set_sg,
 293         .get_strings            = dsa_slave_get_strings,
 294         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 295         .get_sset_count         = dsa_slave_get_sset_count,
 296 };
 297
 298 #ifdef CONFIG_NET_DSA_TAG_DSA
 299 static const struct net_device_ops dsa_netdev_ops = {
 300         .ndo_init               = dsa_slave_init,
 301         .ndo_open               = dsa_slave_open,
 302         .ndo_stop               = dsa_slave_close,
 303         .ndo_start_xmit         = dsa_xmit,
 304         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 305         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 306         .ndo_set_multicast_list = dsa_slave_set_rx_mode,
 307         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 308         .ndo_do_ioctl           = dsa_slave_ioctl,
 309 };
 310 #endif
 311 #ifdef CONFIG_NET_DSA_TAG_EDSA
 312 static const struct net_device_ops edsa_netdev_ops = {
 313         .ndo_init               = dsa_slave_init,
 314         .ndo_open               = dsa_slave_open,
 315         .ndo_stop               = dsa_slave_close,
 316         .ndo_start_xmit         = edsa_xmit,
 317         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 318         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 319         .ndo_set_multicast_list = dsa_slave_set_rx_mode,
 320         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 321         .ndo_do_ioctl           = dsa_slave_ioctl,
 322 };
 323 #endif
 324 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 325 static const struct net_device_ops trailer_netdev_ops = {
 326         .ndo_init               = dsa_slave_init,
 327         .ndo_open               = dsa_slave_open,
 328         .ndo_stop               = dsa_slave_close,
 329         .ndo_start_xmit         = trailer_xmit,
 330         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 331         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 332         .ndo_set_multicast_list = dsa_slave_set_rx_mode,
 333         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 334         .ndo_do_ioctl           = dsa_slave_ioctl,
 335 };
 336 #endif
 337
 338 /* slave device setup *******************************************************/
 339 struct net_device *
 340 dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 341                  int port, char *name)
 342 {
 343         struct net_device *master = ds->dst->master_netdev;
 344         struct net_device *slave_dev;
 345         struct dsa_slave_priv *p;
 346         int ret;
 347
 348         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv),
 349                                  name, ether_setup);
 350         if (slave_dev == NULL)
 351                 return slave_dev;
 352
 353         slave_dev->features = master->vlan_features;
 354         SET_ETHTOOL_OPS(slave_dev, &dsa_slave_ethtool_ops);
 355         memcpy(slave_dev->dev_addr, master->dev_addr, ETH_ALEN);
 356         slave_dev->tx_queue_len = 0;
 357
 358         switch (ds->dst->tag_protocol) {
 359 #ifdef CONFIG_NET_DSA_TAG_DSA
 360         case htons(ETH_P_DSA):
 361                 slave_dev->netdev_ops = &dsa_netdev_ops;
 362                 break;
 363 #endif
 364 #ifdef CONFIG_NET_DSA_TAG_EDSA
 365         case htons(ETH_P_EDSA):
 366                 slave_dev->netdev_ops = &edsa_netdev_ops;
 367                 break;
 368 #endif
 369 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 370         case htons(ETH_P_TRAILER):
 371                 slave_dev->netdev_ops = &trailer_netdev_ops;
 372                 break;
 373 #endif
 374         default:
 375                 BUG();
 376         }
 377
 378         SET_NETDEV_DEV(slave_dev, parent);
 379         slave_dev->vlan_features = master->vlan_features;
 380
 381         p = netdev_priv(slave_dev);
 382         p->dev = slave_dev;
 383         p->parent = ds;
 384         p->port = port;
 385         p->phy = ds->slave_mii_bus->phy_map[port];
 386
 387         ret = register_netdev(slave_dev);
 388         if (ret) {
 389                 printk(KERN_ERR "%s: error %d registering interface %s\n",
 390                                 master->name, ret, slave_dev->name);
 391                 free_netdev(slave_dev);
 392                 return NULL;
 393         }
 394
 395         netif_carrier_off(slave_dev);
 396
 397         if (p->phy != NULL) {
 398                 phy_attach(slave_dev, dev_name(&p->phy->dev),
 399                            0, PHY_INTERFACE_MODE_GMII);
 400
 401                 p->phy->autoneg = AUTONEG_ENABLE;
 402                 p->phy->speed = 0;
 403                 p->phy->duplex = 0;
 404                 p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
 405                 phy_start_aneg(p->phy);
 406         }
 407
 408         return slave_dev;
 409 }