slave.c

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/*
 * net/dsa/slave.c - Slave device handling
 * Copyright (c) 2008-2009 Marvell Semiconductor
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/phy.h>
#include "dsa_priv.h"

/* slave mii_bus handling ***************************************************/
static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
{
    struct dsa_switch *ds = bus->priv;

    if (ds->phys_port_mask & (1 << addr))
        return ds->drv->phy_read(ds, addr, reg);

    return 0xffff;
}

static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
{
    struct dsa_switch *ds = bus->priv;

    if (ds->phys_port_mask & (1 << addr))
        return ds->drv->phy_write(ds, addr, reg, val);

    return 0;
}

void dsa_slave_mii_bus_init(struct dsa_switch *ds)
{
    ds->slave_mii_bus->priv = (void *)ds;
    ds->slave_mii_bus->name = "dsa slave smi";
    ds->slave_mii_bus->read = dsa_slave_phy_read;
    ds->slave_mii_bus->write = dsa_slave_phy_write;
    snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "%s:%.2x",
            ds->master_mii_bus->id, ds->pd->sw_addr);
    ds->slave_mii_bus->parent = &ds->master_mii_bus->dev;
}


/* slave device handling ****************************************************/
static int dsa_slave_init(struct net_device *dev)
{
    struct dsa_slave_priv *p = netdev_priv(dev);

    dev->iflink = p->parent->dst->master_netdev->ifindex;

    return 0;
}

static int dsa_slave_open(struct net_device *dev)
{
    struct dsa_slave_priv *p = netdev_priv(dev);
    struct net_device *master = p->parent->dst->master_netdev;
    int err;

    if (!(master->flags & IFF_UP))
        return -ENETDOWN;

    if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
        err = dev_uc_add(master, dev->dev_addr);
        if (err < 0)
            goto out;
    }

    if (dev->flags & IFF_ALLMULTI) {
        err = dev_set_allmulti(master, 1);
        if (err < 0)
            goto del_unicast;
    }
    if (dev->flags & IFF_PROMISC) {
        err = dev_set_promiscuity(master, 1);
        if (err < 0)
            goto clear_allmulti;
    }

    return 0;

clear_allmulti:
    if (dev->flags & IFF_ALLMULTI)
        dev_set_allmulti(master, -1);
del_unicast:
    if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
        dev_uc_del(master, dev->dev_addr);
out:
    return err;
}

static int dsa_slave_close(struct net_device *dev)
{
    struct dsa_slave_priv *p = netdev_priv(dev);
    struct net_device *master = p->parent->dst->master_netdev;

    dev_mc_unsync(master, dev);
    dev_uc_unsync(master, dev);
    if (dev->flags & IFF_ALLMULTI)
        dev_set_allmulti(master, -1);
    if (dev->flags & IFF_PROMISC)
        dev_set_promiscuity(master, -1);

    if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
        dev_uc_del(master, dev->dev_addr);

    return 0;
}

static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
{
    struct dsa_slave_priv *p = netdev_priv(dev);
    struct net_device *master = p->parent->dst->master_netdev;

    if (change & IFF_ALLMULTI)
        dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
    if (change & IFF_PROMISC)
        dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
}

static void dsa_slave_set_rx_mode(struct net_device *dev)
{
    struct dsa_slave_priv *p = netdev_priv(dev);
    struct net_device *master = p->parent->dst->master_netdev;

    dev_mc_sync(master, dev);
    dev_uc_sync(master, dev);
}

static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
{
    struct dsa_slave_priv *p = netdev_priv(dev);
    struct net_device *master = p->parent->dst->master_netdev;
    struct sockaddr *addr = a;
    int err;

    if (!is_valid_ether_addr(addr->sa_data))
        return -EADDRNOTAVAIL;

    if (!(dev->flags & IFF_UP))
        goto out;

    if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
        err = dev_uc_add(master, addr->sa_data);
        if (err < 0)
            return err;
    }

    if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
        dev_uc_del(master, dev->dev_addr);

out:
    memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);

    return 0;
}

static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
    struct dsa_slave_priv *p = netdev_priv(dev);

    if (p->phy != NULL)
        return phy_mii_ioctl(p->phy, ifr, cmd);

    return -EOPNOTSUPP;
}


/* ethtool operations *******************************************************/
static int
dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
    struct dsa_slave_priv *p = netdev_priv(dev);
    int err;

    err = -EOPNOTSUPP;
    if (p->phy != NULL) {
        err = phy_read_status(p->phy);
        if (err == 0)
            err = phy_ethtool_gset(p->phy, cmd);
    }

    return err;
}

static int
dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
    struct dsa_slave_priv *p = netdev_priv(dev);

    if (p->phy != NULL)
        return phy_ethtool_sset(p->phy, cmd);

    return -EOPNOTSUPP;
}

static void dsa_slave_get_drvinfo(struct net_device *dev,
                  struct ethtool_drvinfo *drvinfo)
{
    strncpy(drvinfo->driver, "dsa", 32);
    strncpy(drvinfo->version, dsa_driver_version, 32);
    strncpy(drvinfo->fw_version, "N/A", 32);
    strncpy(drvinfo->bus_info, "platform", 32);
}

static int dsa_slave_nway_reset(struct net_device *dev)
{
    struct dsa_slave_priv *p = netdev_priv(dev);

    if (p->phy != NULL)
        return genphy_restart_aneg(p->phy);

    return -EOPNOTSUPP;
}

static u32 dsa_slave_get_link(struct net_device *dev)
{
    struct dsa_slave_priv *p = netdev_priv(dev);

    if (p->phy != NULL) {
        genphy_update_link(p->phy);
        return p->phy->link;
    }

    return -EOPNOTSUPP;
}

static void dsa_slave_get_strings(struct net_device *dev,
                  uint32_t stringset, uint8_t *data)
{
    struct dsa_slave_priv *p = netdev_priv(dev);
    struct dsa_switch *ds = p->parent;

    if (stringset == ETH_SS_STATS) {
        int len = ETH_GSTRING_LEN;

        strncpy(data, "tx_packets", len);
        strncpy(data + len, "tx_bytes", len);
        strncpy(data + 2 * len, "rx_packets", len);
        strncpy(data + 3 * len, "rx_bytes", len);
        if (ds->drv->get_strings != NULL)
            ds->drv->get_strings(ds, p->port, data + 4 * len);
    }
}

static void dsa_slave_get_ethtool_stats(struct net_device *dev,
                    struct ethtool_stats *stats,
                    uint64_t *data)
{
    struct dsa_slave_priv *p = netdev_priv(dev);
    struct dsa_switch *ds = p->parent;

    data[0] = p->dev->stats.tx_packets;
    data[1] = p->dev->stats.tx_bytes;
    data[2] = p->dev->stats.rx_packets;
    data[3] = p->dev->stats.rx_bytes;
    if (ds->drv->get_ethtool_stats != NULL)
        ds->drv->get_ethtool_stats(ds, p->port, data + 4);
}

static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
{
    struct dsa_slave_priv *p = netdev_priv(dev);
    struct dsa_switch *ds = p->parent;

    if (sset == ETH_SS_STATS) {
        int count;

        count = 4;
        if (ds->drv->get_sset_count != NULL)
            count += ds->drv->get_sset_count(ds);

        return count;
    }

    return -EOPNOTSUPP;
}

static const struct ethtool_ops dsa_slave_ethtool_ops = {
    .get_settings       = dsa_slave_get_settings,
    .set_settings       = dsa_slave_set_settings,
    .get_drvinfo        = dsa_slave_get_drvinfo,
    .nway_reset     = dsa_slave_nway_reset,
    .get_link       = dsa_slave_get_link,
    .get_strings        = dsa_slave_get_strings,
    .get_ethtool_stats  = dsa_slave_get_ethtool_stats,
    .get_sset_count     = dsa_slave_get_sset_count,
};

#ifdef CONFIG_NET_DSA_TAG_DSA
static const struct net_device_ops dsa_netdev_ops = {
    .ndo_init       = dsa_slave_init,
    .ndo_open       = dsa_slave_open,
    .ndo_stop       = dsa_slave_close,
    .ndo_start_xmit     = dsa_xmit,
    .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
    .ndo_set_rx_mode    = dsa_slave_set_rx_mode,
    .ndo_set_mac_address    = dsa_slave_set_mac_address,
    .ndo_do_ioctl       = dsa_slave_ioctl,
};
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
static const struct net_device_ops edsa_netdev_ops = {
    .ndo_init       = dsa_slave_init,
    .ndo_open       = dsa_slave_open,
    .ndo_stop       = dsa_slave_close,
    .ndo_start_xmit     = edsa_xmit,
    .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
    .ndo_set_rx_mode    = dsa_slave_set_rx_mode,
    .ndo_set_mac_address    = dsa_slave_set_mac_address,
    .ndo_do_ioctl       = dsa_slave_ioctl,
};
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
static const struct net_device_ops trailer_netdev_ops = {
    .ndo_init       = dsa_slave_init,
    .ndo_open       = dsa_slave_open,
    .ndo_stop       = dsa_slave_close,
    .ndo_start_xmit     = trailer_xmit,
    .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
    .ndo_set_rx_mode    = dsa_slave_set_rx_mode,
    .ndo_set_mac_address    = dsa_slave_set_mac_address,
    .ndo_do_ioctl       = dsa_slave_ioctl,
};
#endif

/* slave device setup *******************************************************/
struct net_device *
dsa_slave_create(struct dsa_switch *ds, struct device *parent,
         int port, char *name)
{
    struct net_device *master = ds->dst->master_netdev;
    struct net_device *slave_dev;
    struct dsa_slave_priv *p;
    int ret;

    slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv),
                 name, ether_setup);
    if (slave_dev == NULL)
        return slave_dev;

    slave_dev->features = master->vlan_features;
    SET_ETHTOOL_OPS(slave_dev, &dsa_slave_ethtool_ops);
    memcpy(slave_dev->dev_addr, master->dev_addr, ETH_ALEN);
    slave_dev->tx_queue_len = 0;

    switch (ds->dst->tag_protocol) {
#ifdef CONFIG_NET_DSA_TAG_DSA
    case htons(ETH_P_DSA):
        slave_dev->netdev_ops = &dsa_netdev_ops;
        break;
#endif
#ifdef CONFIG_NET_DSA_TAG_EDSA
    case htons(ETH_P_EDSA):
        slave_dev->netdev_ops = &edsa_netdev_ops;
        break;
#endif
#ifdef CONFIG_NET_DSA_TAG_TRAILER
    case htons(ETH_P_TRAILER):
        slave_dev->netdev_ops = &trailer_netdev_ops;
        break;
#endif
    default:
        BUG();
    }

    SET_NETDEV_DEV(slave_dev, parent);
    slave_dev->vlan_features = master->vlan_features;

    p = netdev_priv(slave_dev);
    p->dev = slave_dev;
    p->parent = ds;
    p->port = port;
    p->phy = ds->slave_mii_bus->phy_map[port];

    ret = register_netdev(slave_dev);
    if (ret) {
        printk(KERN_ERR "%s: error %d registering interface %s\n",
                master->name, ret, slave_dev->name);
        free_netdev(slave_dev);
        return NULL;
    }

    netif_carrier_off(slave_dev);

    if (p->phy != NULL) {
        phy_attach(slave_dev, dev_name(&p->phy->dev),
               0, PHY_INTERFACE_MODE_GMII);

        p->phy->autoneg = AUTONEG_ENABLE;
        p->phy->speed = 0;
        p->phy->duplex = 0;
        p->phy->advertising = p->phy->supported | ADVERTISED_Autoneg;
        phy_start_aneg(p->phy);
    }

    return slave_dev;
}