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_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         struct dsa_switch *ds = p->parent;
  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         if (ds->drv->port_enable) {
  89                 err = ds->drv->port_enable(ds, p->port, p->phy);
  90                 if (err)
  91                         goto clear_promisc;
  92         }
  93
  94         if (p->phy)
  95                 phy_start(p->phy);
  96
  97         return 0;
  98
  99 clear_promisc:
 100         if (dev->flags & IFF_PROMISC)
 101                 dev_set_promiscuity(master, 0);
 102 clear_allmulti:
 103         if (dev->flags & IFF_ALLMULTI)
 104                 dev_set_allmulti(master, -1);
 105 del_unicast:
 106         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 107                 dev_uc_del(master, dev->dev_addr);
 108 out:
 109         return err;
 110 }
 111
 112 static int dsa_slave_close(struct net_device *dev)
 113 {
 114         struct dsa_slave_priv *p = netdev_priv(dev);
 115         struct net_device *master = p->parent->dst->master_netdev;
 116         struct dsa_switch *ds = p->parent;
 117
 118         if (p->phy)
 119                 phy_stop(p->phy);
 120
 121         dev_mc_unsync(master, dev);
 122         dev_uc_unsync(master, dev);
 123         if (dev->flags & IFF_ALLMULTI)
 124                 dev_set_allmulti(master, -1);
 125         if (dev->flags & IFF_PROMISC)
 126                 dev_set_promiscuity(master, -1);
 127
 128         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 129                 dev_uc_del(master, dev->dev_addr);
 130
 131         if (ds->drv->port_disable)
 132                 ds->drv->port_disable(ds, p->port, p->phy);
 133
 134         return 0;
 135 }
 136
 137 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 138 {
 139         struct dsa_slave_priv *p = netdev_priv(dev);
 140         struct net_device *master = p->parent->dst->master_netdev;
 141
 142         if (change & IFF_ALLMULTI)
 143                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 144         if (change & IFF_PROMISC)
 145                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 146 }
 147
 148 static void dsa_slave_set_rx_mode(struct net_device *dev)
 149 {
 150         struct dsa_slave_priv *p = netdev_priv(dev);
 151         struct net_device *master = p->parent->dst->master_netdev;
 152
 153         dev_mc_sync(master, dev);
 154         dev_uc_sync(master, dev);
 155 }
 156
 157 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 158 {
 159         struct dsa_slave_priv *p = netdev_priv(dev);
 160         struct net_device *master = p->parent->dst->master_netdev;
 161         struct sockaddr *addr = a;
 162         int err;
 163
 164         if (!is_valid_ether_addr(addr->sa_data))
 165                 return -EADDRNOTAVAIL;
 166
 167         if (!(dev->flags & IFF_UP))
 168                 goto out;
 169
 170         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 171                 err = dev_uc_add(master, addr->sa_data);
 172                 if (err < 0)
 173                         return err;
 174         }
 175
 176         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 177                 dev_uc_del(master, dev->dev_addr);
 178
 179 out:
 180         ether_addr_copy(dev->dev_addr, addr->sa_data);
 181
 182         return 0;
 183 }
 184
 185 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 186 {
 187         struct dsa_slave_priv *p = netdev_priv(dev);
 188
 189         if (p->phy != NULL)
 190                 return phy_mii_ioctl(p->phy, ifr, cmd);
 191
 192         return -EOPNOTSUPP;
 193 }
 194
 195 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 196 {
 197         struct dsa_slave_priv *p = netdev_priv(dev);
 198
 199         return p->xmit(skb, dev);
 200 }
 201
 202 static netdev_tx_t dsa_slave_notag_xmit(struct sk_buff *skb,
 203                                         struct net_device *dev)
 204 {
 205         struct dsa_slave_priv *p = netdev_priv(dev);
 206
 207         skb->dev = p->parent->dst->master_netdev;
 208         dev_queue_xmit(skb);
 209
 210         return NETDEV_TX_OK;
 211 }
 212
 213
 214 /* ethtool operations *******************************************************/
 215 static int
 216 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 217 {
 218         struct dsa_slave_priv *p = netdev_priv(dev);
 219         int err;
 220
 221         err = -EOPNOTSUPP;
 222         if (p->phy != NULL) {
 223                 err = phy_read_status(p->phy);
 224                 if (err == 0)
 225                         err = phy_ethtool_gset(p->phy, cmd);
 226         }
 227
 228         return err;
 229 }
 230
 231 static int
 232 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 233 {
 234         struct dsa_slave_priv *p = netdev_priv(dev);
 235
 236         if (p->phy != NULL)
 237                 return phy_ethtool_sset(p->phy, cmd);
 238
 239         return -EOPNOTSUPP;
 240 }
 241
 242 static void dsa_slave_get_drvinfo(struct net_device *dev,
 243                                   struct ethtool_drvinfo *drvinfo)
 244 {
 245         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 246         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 247         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 248         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 249 }
 250
 251 static int dsa_slave_nway_reset(struct net_device *dev)
 252 {
 253         struct dsa_slave_priv *p = netdev_priv(dev);
 254
 255         if (p->phy != NULL)
 256                 return genphy_restart_aneg(p->phy);
 257
 258         return -EOPNOTSUPP;
 259 }
 260
 261 static u32 dsa_slave_get_link(struct net_device *dev)
 262 {
 263         struct dsa_slave_priv *p = netdev_priv(dev);
 264
 265         if (p->phy != NULL) {
 266                 genphy_update_link(p->phy);
 267                 return p->phy->link;
 268         }
 269
 270         return -EOPNOTSUPP;
 271 }
 272
 273 static void dsa_slave_get_strings(struct net_device *dev,
 274                                   uint32_t stringset, uint8_t *data)
 275 {
 276         struct dsa_slave_priv *p = netdev_priv(dev);
 277         struct dsa_switch *ds = p->parent;
 278
 279         if (stringset == ETH_SS_STATS) {
 280                 int len = ETH_GSTRING_LEN;
 281
 282                 strncpy(data, "tx_packets", len);
 283                 strncpy(data + len, "tx_bytes", len);
 284                 strncpy(data + 2 * len, "rx_packets", len);
 285                 strncpy(data + 3 * len, "rx_bytes", len);
 286                 if (ds->drv->get_strings != NULL)
 287                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 288         }
 289 }
 290
 291 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 292                                         struct ethtool_stats *stats,
 293                                         uint64_t *data)
 294 {
 295         struct dsa_slave_priv *p = netdev_priv(dev);
 296         struct dsa_switch *ds = p->parent;
 297
 298         data[0] = p->dev->stats.tx_packets;
 299         data[1] = p->dev->stats.tx_bytes;
 300         data[2] = p->dev->stats.rx_packets;
 301         data[3] = p->dev->stats.rx_bytes;
 302         if (ds->drv->get_ethtool_stats != NULL)
 303                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 304 }
 305
 306 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 307 {
 308         struct dsa_slave_priv *p = netdev_priv(dev);
 309         struct dsa_switch *ds = p->parent;
 310
 311         if (sset == ETH_SS_STATS) {
 312                 int count;
 313
 314                 count = 4;
 315                 if (ds->drv->get_sset_count != NULL)
 316                         count += ds->drv->get_sset_count(ds);
 317
 318                 return count;
 319         }
 320
 321         return -EOPNOTSUPP;
 322 }
 323
 324 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 325 {
 326         struct dsa_slave_priv *p = netdev_priv(dev);
 327         struct dsa_switch *ds = p->parent;
 328
 329         if (ds->drv->get_wol)
 330                 ds->drv->get_wol(ds, p->port, w);
 331 }
 332
 333 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 334 {
 335         struct dsa_slave_priv *p = netdev_priv(dev);
 336         struct dsa_switch *ds = p->parent;
 337         int ret = -EOPNOTSUPP;
 338
 339         if (ds->drv->set_wol)
 340                 ret = ds->drv->set_wol(ds, p->port, w);
 341
 342         return ret;
 343 }
 344
 345 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 346         .get_settings           = dsa_slave_get_settings,
 347         .set_settings           = dsa_slave_set_settings,
 348         .get_drvinfo            = dsa_slave_get_drvinfo,
 349         .nway_reset             = dsa_slave_nway_reset,
 350         .get_link               = dsa_slave_get_link,
 351         .get_strings            = dsa_slave_get_strings,
 352         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 353         .get_sset_count         = dsa_slave_get_sset_count,
 354         .set_wol                = dsa_slave_set_wol,
 355         .get_wol                = dsa_slave_get_wol,
 356 };
 357
 358 static const struct net_device_ops dsa_slave_netdev_ops = {
 359         .ndo_init               = dsa_slave_init,
 360         .ndo_open               = dsa_slave_open,
 361         .ndo_stop               = dsa_slave_close,
 362         .ndo_start_xmit         = dsa_slave_xmit,
 363         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 364         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 365         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 366         .ndo_do_ioctl           = dsa_slave_ioctl,
 367 };
 368
 369 static void dsa_slave_adjust_link(struct net_device *dev)
 370 {
 371         struct dsa_slave_priv *p = netdev_priv(dev);
 372         struct dsa_switch *ds = p->parent;
 373         unsigned int status_changed = 0;
 374
 375         if (p->old_link != p->phy->link) {
 376                 status_changed = 1;
 377                 p->old_link = p->phy->link;
 378         }
 379
 380         if (p->old_duplex != p->phy->duplex) {
 381                 status_changed = 1;
 382                 p->old_duplex = p->phy->duplex;
 383         }
 384
 385         if (p->old_pause != p->phy->pause) {
 386                 status_changed = 1;
 387                 p->old_pause = p->phy->pause;
 388         }
 389
 390         if (ds->drv->adjust_link && status_changed)
 391                 ds->drv->adjust_link(ds, p->port, p->phy);
 392
 393         if (status_changed)
 394                 phy_print_status(p->phy);
 395 }
 396
 397 static int dsa_slave_fixed_link_update(struct net_device *dev,
 398                                        struct fixed_phy_status *status)
 399 {
 400         struct dsa_slave_priv *p = netdev_priv(dev);
 401         struct dsa_switch *ds = p->parent;
 402
 403         if (ds->drv->fixed_link_update)
 404                 ds->drv->fixed_link_update(ds, p->port, status);
 405
 406         return 0;
 407 }
 408
 409 /* slave device setup *******************************************************/
 410 static void dsa_slave_phy_setup(struct dsa_slave_priv *p,
 411                                 struct net_device *slave_dev)
 412 {
 413         struct dsa_switch *ds = p->parent;
 414         struct dsa_chip_data *cd = ds->pd;
 415         struct device_node *phy_dn, *port_dn;
 416         bool phy_is_fixed = false;
 417         u32 phy_flags = 0;
 418         int ret;
 419
 420         port_dn = cd->port_dn[p->port];
 421         p->phy_interface = of_get_phy_mode(port_dn);
 422
 423         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
 424         if (of_phy_is_fixed_link(port_dn)) {
 425                 /* In the case of a fixed PHY, the DT node associated
 426                  * to the fixed PHY is the Port DT node
 427                  */
 428                 ret = of_phy_register_fixed_link(port_dn);
 429                 if (ret) {
 430                         pr_err("failed to register fixed PHY\n");
 431                         return;
 432                 }
 433                 phy_is_fixed = true;
 434                 phy_dn = port_dn;
 435         }
 436
 437         if (ds->drv->get_phy_flags)
 438                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
 439
 440         if (phy_dn)
 441                 p->phy = of_phy_connect(slave_dev, phy_dn,
 442                                         dsa_slave_adjust_link, phy_flags,
 443                                         p->phy_interface);
 444
 445         if (p->phy && phy_is_fixed)
 446                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
 447
 448         /* We could not connect to a designated PHY, so use the switch internal
 449          * MDIO bus instead
 450          */
 451         if (!p->phy)
 452                 p->phy = ds->slave_mii_bus->phy_map[p->port];
 453         else
 454                 pr_info("attached PHY at address %d [%s]\n",
 455                         p->phy->addr, p->phy->drv->name);
 456 }
 457
 458 int dsa_slave_suspend(struct net_device *slave_dev)
 459 {
 460         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 461
 462         netif_device_detach(slave_dev);
 463
 464         if (p->phy) {
 465                 phy_stop(p->phy);
 466                 p->old_pause = -1;
 467                 p->old_link = -1;
 468                 p->old_duplex = -1;
 469                 phy_suspend(p->phy);
 470         }
 471
 472         return 0;
 473 }
 474
 475 int dsa_slave_resume(struct net_device *slave_dev)
 476 {
 477         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 478
 479         netif_device_attach(slave_dev);
 480
 481         if (p->phy) {
 482                 phy_resume(p->phy);
 483                 phy_start(p->phy);
 484         }
 485
 486         return 0;
 487 }
 488
 489 struct net_device *
 490 dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 491                  int port, char *name)
 492 {
 493         struct net_device *master = ds->dst->master_netdev;
 494         struct net_device *slave_dev;
 495         struct dsa_slave_priv *p;
 496         int ret;
 497
 498         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
 499                                  NET_NAME_UNKNOWN, ether_setup);
 500         if (slave_dev == NULL)
 501                 return slave_dev;
 502
 503         slave_dev->features = master->vlan_features;
 504         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
 505         eth_hw_addr_inherit(slave_dev, master);
 506         slave_dev->tx_queue_len = 0;
 507         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
 508
 509         SET_NETDEV_DEV(slave_dev, parent);
 510         slave_dev->dev.of_node = ds->pd->port_dn[port];
 511         slave_dev->vlan_features = master->vlan_features;
 512
 513         p = netdev_priv(slave_dev);
 514         p->dev = slave_dev;
 515         p->parent = ds;
 516         p->port = port;
 517
 518         switch (ds->dst->tag_protocol) {
 519 #ifdef CONFIG_NET_DSA_TAG_DSA
 520         case DSA_TAG_PROTO_DSA:
 521                 p->xmit = dsa_netdev_ops.xmit;
 522                 break;
 523 #endif
 524 #ifdef CONFIG_NET_DSA_TAG_EDSA
 525         case DSA_TAG_PROTO_EDSA:
 526                 p->xmit = edsa_netdev_ops.xmit;
 527                 break;
 528 #endif
 529 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 530         case DSA_TAG_PROTO_TRAILER:
 531                 p->xmit = trailer_netdev_ops.xmit;
 532                 break;
 533 #endif
 534 #ifdef CONFIG_NET_DSA_TAG_BRCM
 535         case DSA_TAG_PROTO_BRCM:
 536                 p->xmit = brcm_netdev_ops.xmit;
 537                 break;
 538 #endif
 539         default:
 540                 p->xmit = dsa_slave_notag_xmit;
 541                 break;
 542         }
 543
 544         p->old_pause = -1;
 545         p->old_link = -1;
 546         p->old_duplex = -1;
 547
 548         dsa_slave_phy_setup(p, slave_dev);
 549
 550         ret = register_netdev(slave_dev);
 551         if (ret) {
 552                 printk(KERN_ERR "%s: error %d registering interface %s\n",
 553                                 master->name, ret, slave_dev->name);
 554                 free_netdev(slave_dev);
 555                 return NULL;
 556         }
 557
 558         netif_carrier_off(slave_dev);
 559
 560         if (p->phy != NULL) {
 561                 if (ds->drv->get_phy_flags(ds, port))
 562                         p->phy->dev_flags |= ds->drv->get_phy_flags(ds, port);
 563
 564                 phy_attach(slave_dev, dev_name(&p->phy->dev),
 565                            PHY_INTERFACE_MODE_GMII);
 566
 567                 p->phy->autoneg = AUTONEG_ENABLE;
 568                 p->phy->speed = 0;
 569                 p->phy->duplex = 0;
 570                 p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
 571                 phy_start_aneg(p->phy);
 572         }
 573
 574         return slave_dev;
 575 }