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 <linux/of_net.h>
  16 #include <linux/of_mdio.h>
  17 #include "dsa_priv.h"
  18
  19 /* slave mii_bus handling ***************************************************/
  20 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  21 {
  22         struct dsa_switch *ds = bus->priv;
  23
  24         if (ds->phys_mii_mask & (1 << addr))
  25                 return ds->drv->phy_read(ds, addr, reg);
  26
  27         return 0xffff;
  28 }
  29
  30 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  31 {
  32         struct dsa_switch *ds = bus->priv;
  33
  34         if (ds->phys_mii_mask & (1 << addr))
  35                 return ds->drv->phy_write(ds, addr, reg, val);
  36
  37         return 0;
  38 }
  39
  40 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  41 {
  42         ds->slave_mii_bus->priv = (void *)ds;
  43         ds->slave_mii_bus->name = "dsa slave smi";
  44         ds->slave_mii_bus->read = dsa_slave_phy_read;
  45         ds->slave_mii_bus->write = dsa_slave_phy_write;
  46         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
  47                         ds->index, ds->pd->sw_addr);
  48         ds->slave_mii_bus->parent = &ds->master_mii_bus->dev;
  49 }
  50
  51
  52 /* slave device handling ****************************************************/
  53 static int dsa_slave_init(struct net_device *dev)
  54 {
  55         struct dsa_slave_priv *p = netdev_priv(dev);
  56
  57         dev->iflink = p->parent->dst->master_netdev->ifindex;
  58
  59         return 0;
  60 }
  61
  62 static int dsa_slave_open(struct net_device *dev)
  63 {
  64         struct dsa_slave_priv *p = netdev_priv(dev);
  65         struct net_device *master = p->parent->dst->master_netdev;
  66         int err;
  67
  68         if (!(master->flags & IFF_UP))
  69                 return -ENETDOWN;
  70
  71         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  72                 err = dev_uc_add(master, dev->dev_addr);
  73                 if (err < 0)
  74                         goto out;
  75         }
  76
  77         if (dev->flags & IFF_ALLMULTI) {
  78                 err = dev_set_allmulti(master, 1);
  79                 if (err < 0)
  80                         goto del_unicast;
  81         }
  82         if (dev->flags & IFF_PROMISC) {
  83                 err = dev_set_promiscuity(master, 1);
  84                 if (err < 0)
  85                         goto clear_allmulti;
  86         }
  87
  88         return 0;
  89
  90 clear_allmulti:
  91         if (dev->flags & IFF_ALLMULTI)
  92                 dev_set_allmulti(master, -1);
  93 del_unicast:
  94         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
  95                 dev_uc_del(master, dev->dev_addr);
  96 out:
  97         return err;
  98 }
  99
 100 static int dsa_slave_close(struct net_device *dev)
 101 {
 102         struct dsa_slave_priv *p = netdev_priv(dev);
 103         struct net_device *master = p->parent->dst->master_netdev;
 104
 105         dev_mc_unsync(master, dev);
 106         dev_uc_unsync(master, dev);
 107         if (dev->flags & IFF_ALLMULTI)
 108                 dev_set_allmulti(master, -1);
 109         if (dev->flags & IFF_PROMISC)
 110                 dev_set_promiscuity(master, -1);
 111
 112         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 113                 dev_uc_del(master, dev->dev_addr);
 114
 115         return 0;
 116 }
 117
 118 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 119 {
 120         struct dsa_slave_priv *p = netdev_priv(dev);
 121         struct net_device *master = p->parent->dst->master_netdev;
 122
 123         if (change & IFF_ALLMULTI)
 124                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 125         if (change & IFF_PROMISC)
 126                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 127 }
 128
 129 static void dsa_slave_set_rx_mode(struct net_device *dev)
 130 {
 131         struct dsa_slave_priv *p = netdev_priv(dev);
 132         struct net_device *master = p->parent->dst->master_netdev;
 133
 134         dev_mc_sync(master, dev);
 135         dev_uc_sync(master, dev);
 136 }
 137
 138 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 139 {
 140         struct dsa_slave_priv *p = netdev_priv(dev);
 141         struct net_device *master = p->parent->dst->master_netdev;
 142         struct sockaddr *addr = a;
 143         int err;
 144
 145         if (!is_valid_ether_addr(addr->sa_data))
 146                 return -EADDRNOTAVAIL;
 147
 148         if (!(dev->flags & IFF_UP))
 149                 goto out;
 150
 151         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 152                 err = dev_uc_add(master, addr->sa_data);
 153                 if (err < 0)
 154                         return err;
 155         }
 156
 157         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 158                 dev_uc_del(master, dev->dev_addr);
 159
 160 out:
 161         ether_addr_copy(dev->dev_addr, addr->sa_data);
 162
 163         return 0;
 164 }
 165
 166 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 167 {
 168         struct dsa_slave_priv *p = netdev_priv(dev);
 169
 170         if (p->phy != NULL)
 171                 return phy_mii_ioctl(p->phy, ifr, cmd);
 172
 173         return -EOPNOTSUPP;
 174 }
 175
 176 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 177 {
 178         struct dsa_slave_priv *p = netdev_priv(dev);
 179         struct dsa_switch_tree *dst = p->parent->dst;
 180
 181         return dst->ops->xmit(skb, dev);
 182 }
 183
 184
 185 /* ethtool operations *******************************************************/
 186 static int
 187 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 188 {
 189         struct dsa_slave_priv *p = netdev_priv(dev);
 190         int err;
 191
 192         err = -EOPNOTSUPP;
 193         if (p->phy != NULL) {
 194                 err = phy_read_status(p->phy);
 195                 if (err == 0)
 196                         err = phy_ethtool_gset(p->phy, cmd);
 197         }
 198
 199         return err;
 200 }
 201
 202 static int
 203 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 204 {
 205         struct dsa_slave_priv *p = netdev_priv(dev);
 206
 207         if (p->phy != NULL)
 208                 return phy_ethtool_sset(p->phy, cmd);
 209
 210         return -EOPNOTSUPP;
 211 }
 212
 213 static void dsa_slave_get_drvinfo(struct net_device *dev,
 214                                   struct ethtool_drvinfo *drvinfo)
 215 {
 216         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 217         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 218         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 219         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 220 }
 221
 222 static int dsa_slave_nway_reset(struct net_device *dev)
 223 {
 224         struct dsa_slave_priv *p = netdev_priv(dev);
 225
 226         if (p->phy != NULL)
 227                 return genphy_restart_aneg(p->phy);
 228
 229         return -EOPNOTSUPP;
 230 }
 231
 232 static u32 dsa_slave_get_link(struct net_device *dev)
 233 {
 234         struct dsa_slave_priv *p = netdev_priv(dev);
 235
 236         if (p->phy != NULL) {
 237                 genphy_update_link(p->phy);
 238                 return p->phy->link;
 239         }
 240
 241         return -EOPNOTSUPP;
 242 }
 243
 244 static void dsa_slave_get_strings(struct net_device *dev,
 245                                   uint32_t stringset, uint8_t *data)
 246 {
 247         struct dsa_slave_priv *p = netdev_priv(dev);
 248         struct dsa_switch *ds = p->parent;
 249
 250         if (stringset == ETH_SS_STATS) {
 251                 int len = ETH_GSTRING_LEN;
 252
 253                 strncpy(data, "tx_packets", len);
 254                 strncpy(data + len, "tx_bytes", len);
 255                 strncpy(data + 2 * len, "rx_packets", len);
 256                 strncpy(data + 3 * len, "rx_bytes", len);
 257                 if (ds->drv->get_strings != NULL)
 258                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 259         }
 260 }
 261
 262 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 263                                         struct ethtool_stats *stats,
 264                                         uint64_t *data)
 265 {
 266         struct dsa_slave_priv *p = netdev_priv(dev);
 267         struct dsa_switch *ds = p->parent;
 268
 269         data[0] = p->dev->stats.tx_packets;
 270         data[1] = p->dev->stats.tx_bytes;
 271         data[2] = p->dev->stats.rx_packets;
 272         data[3] = p->dev->stats.rx_bytes;
 273         if (ds->drv->get_ethtool_stats != NULL)
 274                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 275 }
 276
 277 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 278 {
 279         struct dsa_slave_priv *p = netdev_priv(dev);
 280         struct dsa_switch *ds = p->parent;
 281
 282         if (sset == ETH_SS_STATS) {
 283                 int count;
 284
 285                 count = 4;
 286                 if (ds->drv->get_sset_count != NULL)
 287                         count += ds->drv->get_sset_count(ds);
 288
 289                 return count;
 290         }
 291
 292         return -EOPNOTSUPP;
 293 }
 294
 295 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 296         .get_settings           = dsa_slave_get_settings,
 297         .set_settings           = dsa_slave_set_settings,
 298         .get_drvinfo            = dsa_slave_get_drvinfo,
 299         .nway_reset             = dsa_slave_nway_reset,
 300         .get_link               = dsa_slave_get_link,
 301         .get_strings            = dsa_slave_get_strings,
 302         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 303         .get_sset_count         = dsa_slave_get_sset_count,
 304 };
 305
 306 static const struct net_device_ops dsa_slave_netdev_ops = {
 307         .ndo_init               = dsa_slave_init,
 308         .ndo_open               = dsa_slave_open,
 309         .ndo_stop               = dsa_slave_close,
 310         .ndo_start_xmit         = dsa_slave_xmit,
 311         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 312         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 313         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 314         .ndo_do_ioctl           = dsa_slave_ioctl,
 315 };
 316
 317 static void dsa_slave_adjust_link(struct net_device *dev)
 318 {
 319         struct dsa_slave_priv *p = netdev_priv(dev);
 320         unsigned int status_changed = 0;
 321
 322         if (p->old_link != p->phy->link) {
 323                 status_changed = 1;
 324                 p->old_link = p->phy->link;
 325         }
 326
 327         if (p->old_duplex != p->phy->duplex) {
 328                 status_changed = 1;
 329                 p->old_duplex = p->phy->duplex;
 330         }
 331
 332         if (p->old_pause != p->phy->pause) {
 333                 status_changed = 1;
 334                 p->old_pause = p->phy->pause;
 335         }
 336
 337         if (status_changed)
 338                 phy_print_status(p->phy);
 339 }
 340
 341 /* slave device setup *******************************************************/
 342 static void dsa_slave_phy_setup(struct dsa_slave_priv *p,
 343                                 struct net_device *slave_dev)
 344 {
 345         struct dsa_switch *ds = p->parent;
 346         struct dsa_chip_data *cd = ds->pd;
 347         struct device_node *phy_dn, *port_dn;
 348         int ret;
 349
 350         port_dn = cd->port_dn[p->port];
 351         p->phy_interface = of_get_phy_mode(port_dn);
 352
 353         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
 354         if (of_phy_is_fixed_link(port_dn)) {
 355                 /* In the case of a fixed PHY, the DT node associated
 356                  * to the fixed PHY is the Port DT node
 357                  */
 358                 ret = of_phy_register_fixed_link(port_dn);
 359                 if (ret) {
 360                         pr_err("failed to register fixed PHY\n");
 361                         return;
 362                 }
 363                 phy_dn = port_dn;
 364         }
 365
 366         if (phy_dn)
 367                 p->phy = of_phy_connect(slave_dev, phy_dn,
 368                                         dsa_slave_adjust_link, 0,
 369                                         p->phy_interface);
 370
 371         /* We could not connect to a designated PHY, so use the switch internal
 372          * MDIO bus instead
 373          */
 374         if (!p->phy)
 375                 p->phy = ds->slave_mii_bus->phy_map[p->port];
 376         else
 377                 pr_info("attached PHY at address %d [%s]\n",
 378                         p->phy->addr, p->phy->drv->name);
 379 }
 380
 381 struct net_device *
 382 dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 383                  int port, char *name)
 384 {
 385         struct net_device *master = ds->dst->master_netdev;
 386         struct net_device *slave_dev;
 387         struct dsa_slave_priv *p;
 388         int ret;
 389
 390         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
 391                                  NET_NAME_UNKNOWN, ether_setup);
 392         if (slave_dev == NULL)
 393                 return slave_dev;
 394
 395         slave_dev->features = master->vlan_features;
 396         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
 397         eth_hw_addr_inherit(slave_dev, master);
 398         slave_dev->tx_queue_len = 0;
 399         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
 400
 401         switch (ds->dst->tag_protocol) {
 402 #ifdef CONFIG_NET_DSA_TAG_DSA
 403         case htons(ETH_P_DSA):
 404                 ds->dst->ops = &dsa_netdev_ops;
 405                 break;
 406 #endif
 407 #ifdef CONFIG_NET_DSA_TAG_EDSA
 408         case htons(ETH_P_EDSA):
 409                 ds->dst->ops = &edsa_netdev_ops;
 410                 break;
 411 #endif
 412 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 413         case htons(ETH_P_TRAILER):
 414                 ds->dst->ops = &trailer_netdev_ops;
 415                 break;
 416 #endif
 417         default:
 418                 BUG();
 419         }
 420
 421         SET_NETDEV_DEV(slave_dev, parent);
 422         slave_dev->dev.of_node = ds->pd->port_dn[port];
 423         slave_dev->vlan_features = master->vlan_features;
 424
 425         p = netdev_priv(slave_dev);
 426         p->dev = slave_dev;
 427         p->parent = ds;
 428         p->port = port;
 429
 430         p->old_pause = -1;
 431         p->old_link = -1;
 432         p->old_duplex = -1;
 433
 434         dsa_slave_phy_setup(p, slave_dev);
 435
 436         ret = register_netdev(slave_dev);
 437         if (ret) {
 438                 printk(KERN_ERR "%s: error %d registering interface %s\n",
 439                                 master->name, ret, slave_dev->name);
 440                 free_netdev(slave_dev);
 441                 return NULL;
 442         }
 443
 444         netif_carrier_off(slave_dev);
 445
 446         if (p->phy != NULL) {
 447                 phy_attach(slave_dev, dev_name(&p->phy->dev),
 448                            PHY_INTERFACE_MODE_GMII);
 449
 450                 p->phy->autoneg = AUTONEG_ENABLE;
 451                 p->phy->speed = 0;
 452                 p->phy->duplex = 0;
 453                 p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
 454                 phy_start_aneg(p->phy);
 455         }
 456
 457         return slave_dev;
 458 }