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/phy_fixed.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_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         struct dsa_switch *ds = p->parent;
  67         int err;
  68
  69         if (!(master->flags & IFF_UP))
  70                 return -ENETDOWN;
  71
  72         if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
  73                 err = dev_uc_add(master, dev->dev_addr);
  74                 if (err < 0)
  75                         goto out;
  76         }
  77
  78         if (dev->flags & IFF_ALLMULTI) {
  79                 err = dev_set_allmulti(master, 1);
  80                 if (err < 0)
  81                         goto del_unicast;
  82         }
  83         if (dev->flags & IFF_PROMISC) {
  84                 err = dev_set_promiscuity(master, 1);
  85                 if (err < 0)
  86                         goto clear_allmulti;
  87         }
  88
  89         if (ds->drv->port_enable) {
  90                 err = ds->drv->port_enable(ds, p->port, p->phy);
  91                 if (err)
  92                         goto clear_promisc;
  93         }
  94
  95         if (p->phy)
  96                 phy_start(p->phy);
  97
  98         return 0;
  99
 100 clear_promisc:
 101         if (dev->flags & IFF_PROMISC)
 102                 dev_set_promiscuity(master, 0);
 103 clear_allmulti:
 104         if (dev->flags & IFF_ALLMULTI)
 105                 dev_set_allmulti(master, -1);
 106 del_unicast:
 107         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 108                 dev_uc_del(master, dev->dev_addr);
 109 out:
 110         return err;
 111 }
 112
 113 static int dsa_slave_close(struct net_device *dev)
 114 {
 115         struct dsa_slave_priv *p = netdev_priv(dev);
 116         struct net_device *master = p->parent->dst->master_netdev;
 117         struct dsa_switch *ds = p->parent;
 118
 119         if (p->phy)
 120                 phy_stop(p->phy);
 121
 122         dev_mc_unsync(master, dev);
 123         dev_uc_unsync(master, dev);
 124         if (dev->flags & IFF_ALLMULTI)
 125                 dev_set_allmulti(master, -1);
 126         if (dev->flags & IFF_PROMISC)
 127                 dev_set_promiscuity(master, -1);
 128
 129         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 130                 dev_uc_del(master, dev->dev_addr);
 131
 132         if (ds->drv->port_disable)
 133                 ds->drv->port_disable(ds, p->port, p->phy);
 134
 135         return 0;
 136 }
 137
 138 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
 139 {
 140         struct dsa_slave_priv *p = netdev_priv(dev);
 141         struct net_device *master = p->parent->dst->master_netdev;
 142
 143         if (change & IFF_ALLMULTI)
 144                 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
 145         if (change & IFF_PROMISC)
 146                 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
 147 }
 148
 149 static void dsa_slave_set_rx_mode(struct net_device *dev)
 150 {
 151         struct dsa_slave_priv *p = netdev_priv(dev);
 152         struct net_device *master = p->parent->dst->master_netdev;
 153
 154         dev_mc_sync(master, dev);
 155         dev_uc_sync(master, dev);
 156 }
 157
 158 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
 159 {
 160         struct dsa_slave_priv *p = netdev_priv(dev);
 161         struct net_device *master = p->parent->dst->master_netdev;
 162         struct sockaddr *addr = a;
 163         int err;
 164
 165         if (!is_valid_ether_addr(addr->sa_data))
 166                 return -EADDRNOTAVAIL;
 167
 168         if (!(dev->flags & IFF_UP))
 169                 goto out;
 170
 171         if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
 172                 err = dev_uc_add(master, addr->sa_data);
 173                 if (err < 0)
 174                         return err;
 175         }
 176
 177         if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
 178                 dev_uc_del(master, dev->dev_addr);
 179
 180 out:
 181         ether_addr_copy(dev->dev_addr, addr->sa_data);
 182
 183         return 0;
 184 }
 185
 186 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 187 {
 188         struct dsa_slave_priv *p = netdev_priv(dev);
 189
 190         if (p->phy != NULL)
 191                 return phy_mii_ioctl(p->phy, ifr, cmd);
 192
 193         return -EOPNOTSUPP;
 194 }
 195
 196 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 197 {
 198         struct dsa_slave_priv *p = netdev_priv(dev);
 199
 200         return p->xmit(skb, dev);
 201 }
 202
 203 static netdev_tx_t dsa_slave_notag_xmit(struct sk_buff *skb,
 204                                         struct net_device *dev)
 205 {
 206         struct dsa_slave_priv *p = netdev_priv(dev);
 207
 208         skb->dev = p->parent->dst->master_netdev;
 209         dev_queue_xmit(skb);
 210
 211         return NETDEV_TX_OK;
 212 }
 213
 214
 215 /* ethtool operations *******************************************************/
 216 static int
 217 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 218 {
 219         struct dsa_slave_priv *p = netdev_priv(dev);
 220         int err;
 221
 222         err = -EOPNOTSUPP;
 223         if (p->phy != NULL) {
 224                 err = phy_read_status(p->phy);
 225                 if (err == 0)
 226                         err = phy_ethtool_gset(p->phy, cmd);
 227         }
 228
 229         return err;
 230 }
 231
 232 static int
 233 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 234 {
 235         struct dsa_slave_priv *p = netdev_priv(dev);
 236
 237         if (p->phy != NULL)
 238                 return phy_ethtool_sset(p->phy, cmd);
 239
 240         return -EOPNOTSUPP;
 241 }
 242
 243 static void dsa_slave_get_drvinfo(struct net_device *dev,
 244                                   struct ethtool_drvinfo *drvinfo)
 245 {
 246         strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
 247         strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
 248         strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
 249         strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
 250 }
 251
 252 static int dsa_slave_nway_reset(struct net_device *dev)
 253 {
 254         struct dsa_slave_priv *p = netdev_priv(dev);
 255
 256         if (p->phy != NULL)
 257                 return genphy_restart_aneg(p->phy);
 258
 259         return -EOPNOTSUPP;
 260 }
 261
 262 static u32 dsa_slave_get_link(struct net_device *dev)
 263 {
 264         struct dsa_slave_priv *p = netdev_priv(dev);
 265
 266         if (p->phy != NULL) {
 267                 genphy_update_link(p->phy);
 268                 return p->phy->link;
 269         }
 270
 271         return -EOPNOTSUPP;
 272 }
 273
 274 static void dsa_slave_get_strings(struct net_device *dev,
 275                                   uint32_t stringset, uint8_t *data)
 276 {
 277         struct dsa_slave_priv *p = netdev_priv(dev);
 278         struct dsa_switch *ds = p->parent;
 279
 280         if (stringset == ETH_SS_STATS) {
 281                 int len = ETH_GSTRING_LEN;
 282
 283                 strncpy(data, "tx_packets", len);
 284                 strncpy(data + len, "tx_bytes", len);
 285                 strncpy(data + 2 * len, "rx_packets", len);
 286                 strncpy(data + 3 * len, "rx_bytes", len);
 287                 if (ds->drv->get_strings != NULL)
 288                         ds->drv->get_strings(ds, p->port, data + 4 * len);
 289         }
 290 }
 291
 292 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
 293                                         struct ethtool_stats *stats,
 294                                         uint64_t *data)
 295 {
 296         struct dsa_slave_priv *p = netdev_priv(dev);
 297         struct dsa_switch *ds = p->parent;
 298
 299         data[0] = p->dev->stats.tx_packets;
 300         data[1] = p->dev->stats.tx_bytes;
 301         data[2] = p->dev->stats.rx_packets;
 302         data[3] = p->dev->stats.rx_bytes;
 303         if (ds->drv->get_ethtool_stats != NULL)
 304                 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
 305 }
 306
 307 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
 308 {
 309         struct dsa_slave_priv *p = netdev_priv(dev);
 310         struct dsa_switch *ds = p->parent;
 311
 312         if (sset == ETH_SS_STATS) {
 313                 int count;
 314
 315                 count = 4;
 316                 if (ds->drv->get_sset_count != NULL)
 317                         count += ds->drv->get_sset_count(ds);
 318
 319                 return count;
 320         }
 321
 322         return -EOPNOTSUPP;
 323 }
 324
 325 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 326 {
 327         struct dsa_slave_priv *p = netdev_priv(dev);
 328         struct dsa_switch *ds = p->parent;
 329
 330         if (ds->drv->get_wol)
 331                 ds->drv->get_wol(ds, p->port, w);
 332 }
 333
 334 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
 335 {
 336         struct dsa_slave_priv *p = netdev_priv(dev);
 337         struct dsa_switch *ds = p->parent;
 338         int ret = -EOPNOTSUPP;
 339
 340         if (ds->drv->set_wol)
 341                 ret = ds->drv->set_wol(ds, p->port, w);
 342
 343         return ret;
 344 }
 345
 346 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
 347 {
 348         struct dsa_slave_priv *p = netdev_priv(dev);
 349         struct dsa_switch *ds = p->parent;
 350         int ret;
 351
 352         if (!ds->drv->set_eee)
 353                 return -EOPNOTSUPP;
 354
 355         ret = ds->drv->set_eee(ds, p->port, p->phy, e);
 356         if (ret)
 357                 return ret;
 358
 359         if (p->phy)
 360                 ret = phy_ethtool_set_eee(p->phy, e);
 361
 362         return ret;
 363 }
 364
 365 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
 366 {
 367         struct dsa_slave_priv *p = netdev_priv(dev);
 368         struct dsa_switch *ds = p->parent;
 369         int ret;
 370
 371         if (!ds->drv->get_eee)
 372                 return -EOPNOTSUPP;
 373
 374         ret = ds->drv->get_eee(ds, p->port, e);
 375         if (ret)
 376                 return ret;
 377
 378         if (p->phy)
 379                 ret = phy_ethtool_get_eee(p->phy, e);
 380
 381         return ret;
 382 }
 383
 384 static const struct ethtool_ops dsa_slave_ethtool_ops = {
 385         .get_settings           = dsa_slave_get_settings,
 386         .set_settings           = dsa_slave_set_settings,
 387         .get_drvinfo            = dsa_slave_get_drvinfo,
 388         .nway_reset             = dsa_slave_nway_reset,
 389         .get_link               = dsa_slave_get_link,
 390         .get_strings            = dsa_slave_get_strings,
 391         .get_ethtool_stats      = dsa_slave_get_ethtool_stats,
 392         .get_sset_count         = dsa_slave_get_sset_count,
 393         .set_wol                = dsa_slave_set_wol,
 394         .get_wol                = dsa_slave_get_wol,
 395         .set_eee                = dsa_slave_set_eee,
 396         .get_eee                = dsa_slave_get_eee,
 397 };
 398
 399 static const struct net_device_ops dsa_slave_netdev_ops = {
 400         .ndo_init               = dsa_slave_init,
 401         .ndo_open               = dsa_slave_open,
 402         .ndo_stop               = dsa_slave_close,
 403         .ndo_start_xmit         = dsa_slave_xmit,
 404         .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
 405         .ndo_set_rx_mode        = dsa_slave_set_rx_mode,
 406         .ndo_set_mac_address    = dsa_slave_set_mac_address,
 407         .ndo_do_ioctl           = dsa_slave_ioctl,
 408 };
 409
 410 static void dsa_slave_adjust_link(struct net_device *dev)
 411 {
 412         struct dsa_slave_priv *p = netdev_priv(dev);
 413         struct dsa_switch *ds = p->parent;
 414         unsigned int status_changed = 0;
 415
 416         if (p->old_link != p->phy->link) {
 417                 status_changed = 1;
 418                 p->old_link = p->phy->link;
 419         }
 420
 421         if (p->old_duplex != p->phy->duplex) {
 422                 status_changed = 1;
 423                 p->old_duplex = p->phy->duplex;
 424         }
 425
 426         if (p->old_pause != p->phy->pause) {
 427                 status_changed = 1;
 428                 p->old_pause = p->phy->pause;
 429         }
 430
 431         if (ds->drv->adjust_link && status_changed)
 432                 ds->drv->adjust_link(ds, p->port, p->phy);
 433
 434         if (status_changed)
 435                 phy_print_status(p->phy);
 436 }
 437
 438 static int dsa_slave_fixed_link_update(struct net_device *dev,
 439                                        struct fixed_phy_status *status)
 440 {
 441         struct dsa_slave_priv *p = netdev_priv(dev);
 442         struct dsa_switch *ds = p->parent;
 443
 444         if (ds->drv->fixed_link_update)
 445                 ds->drv->fixed_link_update(ds, p->port, status);
 446
 447         return 0;
 448 }
 449
 450 /* slave device setup *******************************************************/
 451 static void dsa_slave_phy_setup(struct dsa_slave_priv *p,
 452                                 struct net_device *slave_dev)
 453 {
 454         struct dsa_switch *ds = p->parent;
 455         struct dsa_chip_data *cd = ds->pd;
 456         struct device_node *phy_dn, *port_dn;
 457         bool phy_is_fixed = false;
 458         u32 phy_flags = 0;
 459         int ret;
 460
 461         port_dn = cd->port_dn[p->port];
 462         p->phy_interface = of_get_phy_mode(port_dn);
 463
 464         phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
 465         if (of_phy_is_fixed_link(port_dn)) {
 466                 /* In the case of a fixed PHY, the DT node associated
 467                  * to the fixed PHY is the Port DT node
 468                  */
 469                 ret = of_phy_register_fixed_link(port_dn);
 470                 if (ret) {
 471                         pr_err("failed to register fixed PHY\n");
 472                         return;
 473                 }
 474                 phy_is_fixed = true;
 475                 phy_dn = port_dn;
 476         }
 477
 478         if (ds->drv->get_phy_flags)
 479                 phy_flags = ds->drv->get_phy_flags(ds, p->port);
 480
 481         if (phy_dn)
 482                 p->phy = of_phy_connect(slave_dev, phy_dn,
 483                                         dsa_slave_adjust_link, phy_flags,
 484                                         p->phy_interface);
 485
 486         if (p->phy && phy_is_fixed)
 487                 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
 488
 489         /* We could not connect to a designated PHY, so use the switch internal
 490          * MDIO bus instead
 491          */
 492         if (!p->phy)
 493                 p->phy = ds->slave_mii_bus->phy_map[p->port];
 494         else
 495                 pr_info("attached PHY at address %d [%s]\n",
 496                         p->phy->addr, p->phy->drv->name);
 497 }
 498
 499 int dsa_slave_suspend(struct net_device *slave_dev)
 500 {
 501         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 502
 503         netif_device_detach(slave_dev);
 504
 505         if (p->phy) {
 506                 phy_stop(p->phy);
 507                 p->old_pause = -1;
 508                 p->old_link = -1;
 509                 p->old_duplex = -1;
 510                 phy_suspend(p->phy);
 511         }
 512
 513         return 0;
 514 }
 515
 516 int dsa_slave_resume(struct net_device *slave_dev)
 517 {
 518         struct dsa_slave_priv *p = netdev_priv(slave_dev);
 519
 520         netif_device_attach(slave_dev);
 521
 522         if (p->phy) {
 523                 phy_resume(p->phy);
 524                 phy_start(p->phy);
 525         }
 526
 527         return 0;
 528 }
 529
 530 struct net_device *
 531 dsa_slave_create(struct dsa_switch *ds, struct device *parent,
 532                  int port, char *name)
 533 {
 534         struct net_device *master = ds->dst->master_netdev;
 535         struct net_device *slave_dev;
 536         struct dsa_slave_priv *p;
 537         int ret;
 538
 539         slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
 540                                  NET_NAME_UNKNOWN, ether_setup);
 541         if (slave_dev == NULL)
 542                 return slave_dev;
 543
 544         slave_dev->features = master->vlan_features;
 545         slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
 546         eth_hw_addr_inherit(slave_dev, master);
 547         slave_dev->tx_queue_len = 0;
 548         slave_dev->netdev_ops = &dsa_slave_netdev_ops;
 549
 550         SET_NETDEV_DEV(slave_dev, parent);
 551         slave_dev->dev.of_node = ds->pd->port_dn[port];
 552         slave_dev->vlan_features = master->vlan_features;
 553
 554         p = netdev_priv(slave_dev);
 555         p->dev = slave_dev;
 556         p->parent = ds;
 557         p->port = port;
 558
 559         switch (ds->dst->tag_protocol) {
 560 #ifdef CONFIG_NET_DSA_TAG_DSA
 561         case DSA_TAG_PROTO_DSA:
 562                 p->xmit = dsa_netdev_ops.xmit;
 563                 break;
 564 #endif
 565 #ifdef CONFIG_NET_DSA_TAG_EDSA
 566         case DSA_TAG_PROTO_EDSA:
 567                 p->xmit = edsa_netdev_ops.xmit;
 568                 break;
 569 #endif
 570 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 571         case DSA_TAG_PROTO_TRAILER:
 572                 p->xmit = trailer_netdev_ops.xmit;
 573                 break;
 574 #endif
 575 #ifdef CONFIG_NET_DSA_TAG_BRCM
 576         case DSA_TAG_PROTO_BRCM:
 577                 p->xmit = brcm_netdev_ops.xmit;
 578                 break;
 579 #endif
 580         default:
 581                 p->xmit = dsa_slave_notag_xmit;
 582                 break;
 583         }
 584
 585         p->old_pause = -1;
 586         p->old_link = -1;
 587         p->old_duplex = -1;
 588
 589         dsa_slave_phy_setup(p, slave_dev);
 590
 591         ret = register_netdev(slave_dev);
 592         if (ret) {
 593                 printk(KERN_ERR "%s: error %d registering interface %s\n",
 594                                 master->name, ret, slave_dev->name);
 595                 free_netdev(slave_dev);
 596                 return NULL;
 597         }
 598
 599         netif_carrier_off(slave_dev);
 600
 601         if (p->phy != NULL) {
 602                 if (ds->drv->get_phy_flags)
 603                         p->phy->dev_flags |= ds->drv->get_phy_flags(ds, port);
 604
 605                 phy_attach(slave_dev, dev_name(&p->phy->dev),
 606                            PHY_INTERFACE_MODE_GMII);
 607
 608                 p->phy->autoneg = AUTONEG_ENABLE;
 609                 p->phy->speed = 0;
 610                 p->phy->duplex = 0;
 611                 p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
 612         }
 613
 614         return slave_dev;
 615 }