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/etherdevice.h>
  13 #include <linux/phy.h>
  14 #include <linux/of_net.h>
  15 #include <linux/of_mdio.h>
  16 #include "dsa_priv.h"
  17
  18 /* slave mii_bus handling ***************************************************/
  19 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
  20 {
  21         struct dsa_switch *ds = bus->priv;
  22
  23         if (ds->phys_mii_mask & (1 << addr))
  24                 return ds->drv->phy_read(ds, addr, reg);
  25
  26         return 0xffff;
  27 }
  28
  29 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
  30 {
  31         struct dsa_switch *ds = bus->priv;
  32
  33         if (ds->phys_mii_mask & (1 << addr))
  34                 return ds->drv->phy_write(ds, addr, reg, val);
  35
  36         return 0;
  37 }
  38
  39 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
  40 {
  41         ds->slave_mii_bus->priv = (void *)ds;
  42         ds->slave_mii_bus->name = "dsa slave smi";
  43         ds->slave_mii_bus->read = dsa_slave_phy_read;
  44         ds->slave_mii_bus->write = dsa_slave_phy_write;
  45         snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
  46                         ds->index, ds->pd->sw_addr);
  47         ds->slave_mii_bus->parent = &ds->master_mii_bus->dev;
  48 }
  49
  50
  51 /* slave device handling ****************************************************/
  52 static int dsa_slave_init(struct net_device *dev)
  53 {
  54         struct dsa_slave_priv *p = netdev_priv(dev);
  55
  56         dev->iflink = p->parent->dst->master_netdev->ifindex;
  57
  58         return 0;
  59 }
  60
  61 static int dsa_slave_open(struct net_device *dev)
  62 {
  63         struct dsa_slave_priv *p = netdev_priv(dev);
  64         struct net_device *master = p->parent->dst->master_netdev;
  65         int err;
  66
  67         if (!(master->flags & IFF_UP))
  68                 return -ENETDOWN;
  69
  70         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  71                 err = dev_uc_add(master, dev->dev_addr);
  72                 if (err < 0)
  73                         goto out;
  74         }
  75
  76         if (dev->flags & IFF_ALLMULTI) {
  77                 err = dev_set_allmulti(master, 1);
  78                 if (err < 0)
  79                         goto del_unicast;
  80         }
  81         if (dev->flags & IFF_PROMISC) {
  82                 err = dev_set_promiscuity(master, 1);
  83                 if (err < 0)
  84                         goto clear_allmulti;
  85         }
  86
  87         return 0;
  88
  89 clear_allmulti:
  90         if (dev->flags & IFF_ALLMULTI)
  91                 dev_set_allmulti(master, -1);
  92 del_unicast:
  93         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
  94                 dev_uc_del(master, dev->dev_addr);
  95 out:
  96         return err;
  97 }
  98
  99 static int dsa_slave_close(struct net_device *dev)
 100 {
 101         struct dsa_slave_priv *p = netdev_priv(dev);
 102         struct net_device *master = p->parent->dst->master_netdev;
 103
 104         dev_mc_unsync(master, dev);
 105         dev_uc_unsync(master, dev);
 106         if (dev->flags & IFF_ALLMULTI)
 107                 dev_set_allmulti(master, -1);
 108         if (dev->flags & IFF_PROMISC)
 109                 dev_set_promiscuity(master, -1);
 110
 111         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 112                 dev_uc_del(master, dev->dev_addr);
 113
 114         return 0;
 115 }
 116
 117 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 118 {
 119         struct dsa_slave_priv *p = netdev_priv(dev);
 120         struct net_device *master = p->parent->dst->master_netdev;
 121
 122         if (change & IFF_ALLMULTI)
 123                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 124         if (change & IFF_PROMISC)
 125                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 126 }
 127
 128 static void dsa_slave_set_rx_mode(struct net_device *dev)
 129 {
 130         struct dsa_slave_priv *p = netdev_priv(dev);
 131         struct net_device *master = p->parent->dst->master_netdev;
 132
 133         dev_mc_sync(master, dev);
 134         dev_uc_sync(master, dev);
 135 }
 136
 137 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 138 {
 139         struct dsa_slave_priv *p = netdev_priv(dev);
 140         struct net_device *master = p->parent->dst->master_netdev;
 141         struct sockaddr *addr = a;
 142         int err;
 143
 144         if (!is_valid_ether_addr(addr->sa_data))
 145                 return -EADDRNOTAVAIL;
 146
 147         if (!(dev->flags & IFF_UP))
 148                 goto out;
 149
 150         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 151                 err = dev_uc_add(master, addr->sa_data);
 152                 if (err < 0)
 153                         return err;
 154         }
 155
 156         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 157                 dev_uc_del(master, dev->dev_addr);
 158
 159 out:
 160         ether_addr_copy(dev->dev_addr, addr->sa_data);
 161
 162         return 0;
 163 }
 164
 165 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 166 {
 167         struct dsa_slave_priv *p = netdev_priv(dev);
 168
 169         if (p->phy != NULL)
 170                 return phy_mii_ioctl(p->phy, ifr, cmd);
 171
 172         return -EOPNOTSUPP;
 173 }
 174
 175 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 176 {
 177         struct dsa_slave_priv *p = netdev_priv(dev);
 178
 179         return p->xmit(skb, dev);
 180 }
 181
 182 static netdev_tx_t dsa_slave_notag_xmit(struct sk_buff *skb,
 183                                         struct net_device *dev)
 184 {
 185         struct dsa_slave_priv *p = netdev_priv(dev);
 186
 187         skb->dev = p->parent->dst->master_netdev;
 188         dev_queue_xmit(skb);
 189
 190         return NETDEV_TX_OK;
 191 }
 192
 193
 194 /* ethtool operations *******************************************************/
 195 static int
 196 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 197 {
 198         struct dsa_slave_priv *p = netdev_priv(dev);
 199         int err;
 200
 201         err = -EOPNOTSUPP;
 202         if (p->phy != NULL) {
 203                 err = phy_read_status(p->phy);
 204                 if (err == 0)
 205                         err = phy_ethtool_gset(p->phy, cmd);
 206         }
 207
 208         return err;
 209 }
 210
 211 static int
 212 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 213 {
 214         struct dsa_slave_priv *p = netdev_priv(dev);
 215
 216         if (p->phy != NULL)
 217                 return phy_ethtool_sset(p->phy, cmd);
 218
 219         return -EOPNOTSUPP;
 220 }
 221
 222 static void dsa_slave_get_drvinfo(struct net_device *dev,
 223                                   struct ethtool_drvinfo *drvinfo)
 224 {
 225         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 226         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 227         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 228         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 229 }
 230
 231 static int dsa_slave_nway_reset(struct net_device *dev)
 232 {
 233         struct dsa_slave_priv *p = netdev_priv(dev);
 234
 235         if (p->phy != NULL)
 236                 return genphy_restart_aneg(p->phy);
 237
 238         return -EOPNOTSUPP;
 239 }
 240
 241 static u32 dsa_slave_get_link(struct net_device *dev)
 242 {
 243         struct dsa_slave_priv *p = netdev_priv(dev);
 244
 245         if (p->phy != NULL) {
 246                 genphy_update_link(p->phy);
 247                 return p->phy->link;
 248         }
 249
 250         return -EOPNOTSUPP;
 251 }
 252
 253 static void dsa_slave_get_strings(struct net_device *dev,
 254                                   uint32_t stringset, uint8_t *data)
 255 {
 256         struct dsa_slave_priv *p = netdev_priv(dev);
 257         struct dsa_switch *ds = p->parent;
 258
 259         if (stringset == ETH_SS_STATS) {
 260                 int len = ETH_GSTRING_LEN;
 261
 262                 strncpy(data, "tx_packets", len);
 263                 strncpy(data + len, "tx_bytes", len);
 264                 strncpy(data + 2 * len, "rx_packets", len);
 265                 strncpy(data + 3 * len, "rx_bytes", len);
 266                 if (ds->drv->get_strings != NULL)
 267                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 268         }
 269 }
 270
 271 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 272                                         struct ethtool_stats *stats,
 273                                         uint64_t *data)
 274 {
 275         struct dsa_slave_priv *p = netdev_priv(dev);
 276         struct dsa_switch *ds = p->parent;
 277
 278         data[0] = p->dev->stats.tx_packets;
 279         data[1] = p->dev->stats.tx_bytes;
 280         data[2] = p->dev->stats.rx_packets;
 281         data[3] = p->dev->stats.rx_bytes;
 282         if (ds->drv->get_ethtool_stats != NULL)
 283                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 284 }
 285
 286 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 287 {
 288         struct dsa_slave_priv *p = netdev_priv(dev);
 289         struct dsa_switch *ds = p->parent;
 290
 291         if (sset == ETH_SS_STATS) {
 292                 int count;
 293
 294                 count = 4;
 295                 if (ds->drv->get_sset_count != NULL)
 296                         count += ds->drv->get_sset_count(ds);
 297
 298                 return count;
 299         }
 300
 301         return -EOPNOTSUPP;
 302 }
 303
 304 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 305         .get_settings           = dsa_slave_get_settings,
 306         .set_settings           = dsa_slave_set_settings,
 307         .get_drvinfo            = dsa_slave_get_drvinfo,
 308         .nway_reset             = dsa_slave_nway_reset,
 309         .get_link               = dsa_slave_get_link,
 310         .get_strings            = dsa_slave_get_strings,
 311         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 312         .get_sset_count         = dsa_slave_get_sset_count,
 313 };
 314
 315 static const struct net_device_ops dsa_slave_netdev_ops = {
 316         .ndo_init               = dsa_slave_init,
 317         .ndo_open               = dsa_slave_open,
 318         .ndo_stop               = dsa_slave_close,
 319         .ndo_start_xmit         = dsa_slave_xmit,
 320         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 321         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 322         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 323         .ndo_do_ioctl           = dsa_slave_ioctl,
 324 };
 325
 326 static void dsa_slave_adjust_link(struct net_device *dev)
 327 {
 328         struct dsa_slave_priv *p = netdev_priv(dev);
 329         struct dsa_switch *ds = p->parent;
 330         unsigned int status_changed = 0;
 331
 332         if (p->old_link != p->phy->link) {
 333                 status_changed = 1;
 334                 p->old_link = p->phy->link;
 335         }
 336
 337         if (p->old_duplex != p->phy->duplex) {
 338                 status_changed = 1;
 339                 p->old_duplex = p->phy->duplex;
 340         }
 341
 342         if (p->old_pause != p->phy->pause) {
 343                 status_changed = 1;
 344                 p->old_pause = p->phy->pause;
 345         }
 346
 347         if (ds->drv->adjust_link && status_changed)
 348                 ds->drv->adjust_link(ds, p->port, p->phy);
 349
 350         if (status_changed)
 351                 phy_print_status(p->phy);
 352 }
 353
 354 static int dsa_slave_fixed_link_update(struct net_device *dev,
 355                                        struct fixed_phy_status *status)
 356 {
 357         struct dsa_slave_priv *p = netdev_priv(dev);
 358         struct dsa_switch *ds = p->parent;
 359
 360         if (ds->drv->fixed_link_update)
 361                 ds->drv->fixed_link_update(ds, p->port, status);
 362
 363         return 0;
 364 }
 365
 366 /* slave device setup *******************************************************/
 367 static void dsa_slave_phy_setup(struct dsa_slave_priv *p,
 368                                 struct net_device *slave_dev)
 369 {
 370         struct dsa_switch *ds = p->parent;
 371         struct dsa_chip_data *cd = ds->pd;
 372         struct device_node *phy_dn, *port_dn;
 373         bool phy_is_fixed = false;
 374         int ret;
 375
 376         port_dn = cd->port_dn[p->port];
 377         p->phy_interface = of_get_phy_mode(port_dn);
 378
 379         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
 380         if (of_phy_is_fixed_link(port_dn)) {
 381                 /* In the case of a fixed PHY, the DT node associated
 382                  * to the fixed PHY is the Port DT node
 383                  */
 384                 ret = of_phy_register_fixed_link(port_dn);
 385                 if (ret) {
 386                         pr_err("failed to register fixed PHY\n");
 387                         return;
 388                 }
 389                 phy_is_fixed = true;
 390                 phy_dn = port_dn;
 391         }
 392
 393         if (phy_dn)
 394                 p->phy = of_phy_connect(slave_dev, phy_dn,
 395                                         dsa_slave_adjust_link, 0,
 396                                         p->phy_interface);
 397
 398         if (p->phy && phy_is_fixed)
 399                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
 400
 401         /* We could not connect to a designated PHY, so use the switch internal
 402          * MDIO bus instead
 403          */
 404         if (!p->phy)
 405                 p->phy = ds->slave_mii_bus->phy_map[p->port];
 406         else
 407                 pr_info("attached PHY at address %d [%s]\n",
 408                         p->phy->addr, p->phy->drv->name);
 409 }
 410
 411 struct net_device *
 412 dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 413                  int port, char *name)
 414 {
 415         struct net_device *master = ds->dst->master_netdev;
 416         struct net_device *slave_dev;
 417         struct dsa_slave_priv *p;
 418         int ret;
 419
 420         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
 421                                  NET_NAME_UNKNOWN, ether_setup);
 422         if (slave_dev == NULL)
 423                 return slave_dev;
 424
 425         slave_dev->features = master->vlan_features;
 426         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
 427         eth_hw_addr_inherit(slave_dev, master);
 428         slave_dev->tx_queue_len = 0;
 429         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
 430
 431         SET_NETDEV_DEV(slave_dev, parent);
 432         slave_dev->dev.of_node = ds->pd->port_dn[port];
 433         slave_dev->vlan_features = master->vlan_features;
 434
 435         p = netdev_priv(slave_dev);
 436         p->dev = slave_dev;
 437         p->parent = ds;
 438         p->port = port;
 439
 440         switch (ds->dst->tag_protocol) {
 441 #ifdef CONFIG_NET_DSA_TAG_DSA
 442         case DSA_TAG_PROTO_DSA:
 443                 p->xmit = dsa_netdev_ops.xmit;
 444                 break;
 445 #endif
 446 #ifdef CONFIG_NET_DSA_TAG_EDSA
 447         case DSA_TAG_PROTO_EDSA:
 448                 p->xmit = edsa_netdev_ops.xmit;
 449                 break;
 450 #endif
 451 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 452         case DSA_TAG_PROTO_TRAILER:
 453                 p->xmit = trailer_netdev_ops.xmit;
 454                 break;
 455 #endif
 456 #ifdef CONFIG_NET_DSA_TAG_BRCM
 457         case DSA_TAG_PROTO_BRCM:
 458                 p->xmit = brcm_netdev_ops.xmit;
 459                 break;
 460 #endif
 461         default:
 462                 p->xmit = dsa_slave_notag_xmit;
 463                 break;
 464         }
 465
 466         p->old_pause = -1;
 467         p->old_link = -1;
 468         p->old_duplex = -1;
 469
 470         dsa_slave_phy_setup(p, slave_dev);
 471
 472         ret = register_netdev(slave_dev);
 473         if (ret) {
 474                 printk(KERN_ERR "%s: error %d registering interface %s\n",
 475                                 master->name, ret, slave_dev->name);
 476                 free_netdev(slave_dev);
 477                 return NULL;
 478         }
 479
 480         netif_carrier_off(slave_dev);
 481
 482         if (p->phy != NULL) {
 483                 phy_attach(slave_dev, dev_name(&p->phy->dev),
 484                            PHY_INTERFACE_MODE_GMII);
 485
 486                 p->phy->autoneg = AUTONEG_ENABLE;
 487                 p->phy->speed = 0;
 488                 p->phy->duplex = 0;
 489                 p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
 490                 phy_start_aneg(p->phy);
 491         }
 492
 493         return slave_dev;
 494 }