mib.c

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/*
 * Copyright 2007-2012 Siemens AG
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Written by:
 * Dmitry Eremin-Solenikov <[email protected]>
 * Sergey Lapin <[email protected]>
 * Maxim Gorbachyov <[email protected]>
 * Alexander Smirnov <[email protected]>
 */

#include <linux/if_arp.h>

#include <net/mac802154.h>
#include <net/wpan-phy.h>

#include "mac802154.h"

struct phy_chan_notify_work {
    struct work_struct work;
    struct net_device *dev;
};

struct hw_addr_filt_notify_work {
    struct work_struct work;
    struct net_device *dev;
    unsigned long changed;
};

static struct mac802154_priv *mac802154_slave_get_priv(struct net_device *dev)
{
    struct mac802154_sub_if_data *priv = netdev_priv(dev);

    BUG_ON(dev->type != ARPHRD_IEEE802154);

    return priv->hw;
}

static void hw_addr_notify(struct work_struct *work)
{
    struct hw_addr_filt_notify_work *nw = container_of(work,
            struct hw_addr_filt_notify_work, work);
    struct mac802154_priv *hw = mac802154_slave_get_priv(nw->dev);
    int res;

    res = hw->ops->set_hw_addr_filt(&hw->hw,
                    &hw->hw.hw_filt,
                    nw->changed);
    if (res)
        pr_debug("failed changed mask %lx\n", nw->changed);

    kfree(nw);

    return;
}

static void set_hw_addr_filt(struct net_device *dev, unsigned long changed)
{
    struct mac802154_sub_if_data *priv = netdev_priv(dev);
    struct hw_addr_filt_notify_work *work;

    work = kzalloc(sizeof(*work), GFP_ATOMIC);
    if (!work)
        return;

    INIT_WORK(&work->work, hw_addr_notify);
    work->dev = dev;
    work->changed = changed;
    queue_work(priv->hw->dev_workqueue, &work->work);

    return;
}

void mac802154_dev_set_short_addr(struct net_device *dev, u16 val)
{
    struct mac802154_sub_if_data *priv = netdev_priv(dev);

    BUG_ON(dev->type != ARPHRD_IEEE802154);

    spin_lock_bh(&priv->mib_lock);
    priv->short_addr = val;
    spin_unlock_bh(&priv->mib_lock);

    if ((priv->hw->ops->set_hw_addr_filt) &&
        (priv->hw->hw.hw_filt.short_addr != priv->short_addr)) {
        priv->hw->hw.hw_filt.short_addr = priv->short_addr;
        set_hw_addr_filt(dev, IEEE802515_AFILT_SADDR_CHANGED);
    }
}

u16 mac802154_dev_get_short_addr(const struct net_device *dev)
{
    struct mac802154_sub_if_data *priv = netdev_priv(dev);
    u16 ret;

    BUG_ON(dev->type != ARPHRD_IEEE802154);

    spin_lock_bh(&priv->mib_lock);
    ret = priv->short_addr;
    spin_unlock_bh(&priv->mib_lock);

    return ret;
}

void mac802154_dev_set_ieee_addr(struct net_device *dev)
{
    struct mac802154_sub_if_data *priv = netdev_priv(dev);
    struct mac802154_priv *mac = priv->hw;

    if (mac->ops->set_hw_addr_filt &&
        memcmp(mac->hw.hw_filt.ieee_addr,
           dev->dev_addr, IEEE802154_ADDR_LEN)) {
        memcpy(mac->hw.hw_filt.ieee_addr,
               dev->dev_addr, IEEE802154_ADDR_LEN);
        set_hw_addr_filt(dev, IEEE802515_AFILT_IEEEADDR_CHANGED);
    }
}

u16 mac802154_dev_get_pan_id(const struct net_device *dev)
{
    struct mac802154_sub_if_data *priv = netdev_priv(dev);
    u16 ret;

    BUG_ON(dev->type != ARPHRD_IEEE802154);

    spin_lock_bh(&priv->mib_lock);
    ret = priv->pan_id;
    spin_unlock_bh(&priv->mib_lock);

    return ret;
}

void mac802154_dev_set_pan_id(struct net_device *dev, u16 val)
{
    struct mac802154_sub_if_data *priv = netdev_priv(dev);

    BUG_ON(dev->type != ARPHRD_IEEE802154);

    spin_lock_bh(&priv->mib_lock);
    priv->pan_id = val;
    spin_unlock_bh(&priv->mib_lock);

    if ((priv->hw->ops->set_hw_addr_filt) &&
        (priv->hw->hw.hw_filt.pan_id != priv->pan_id)) {
        priv->hw->hw.hw_filt.pan_id = priv->pan_id;
        set_hw_addr_filt(dev, IEEE802515_AFILT_PANID_CHANGED);
    }
}

static void phy_chan_notify(struct work_struct *work)
{
    struct phy_chan_notify_work *nw = container_of(work,
                      struct phy_chan_notify_work, work);
    struct mac802154_priv *hw = mac802154_slave_get_priv(nw->dev);
    struct mac802154_sub_if_data *priv = netdev_priv(nw->dev);
    int res;

    res = hw->ops->set_channel(&hw->hw, priv->page, priv->chan);
    if (res)
        pr_debug("set_channel failed\n");

    kfree(nw);
}

void mac802154_dev_set_page_channel(struct net_device *dev, u8 page, u8 chan)
{
    struct mac802154_sub_if_data *priv = netdev_priv(dev);
    struct phy_chan_notify_work *work;

    BUG_ON(dev->type != ARPHRD_IEEE802154);

    spin_lock_bh(&priv->mib_lock);
    priv->page = page;
    priv->chan = chan;
    spin_unlock_bh(&priv->mib_lock);

    if (priv->hw->phy->current_channel != priv->chan ||
        priv->hw->phy->current_page != priv->page) {
        work = kzalloc(sizeof(*work), GFP_ATOMIC);
        if (!work)
            return;

        INIT_WORK(&work->work, phy_chan_notify);
        work->dev = dev;
        queue_work(priv->hw->dev_workqueue, &work->work);
    }
}