286 lines
6.9 KiB
C
286 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2007-2012 Siemens AG
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*
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* Written by:
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <net/netlink.h>
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#include <net/nl802154.h>
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#include <net/mac802154.h>
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#include <net/ieee802154_netdev.h>
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#include <net/route.h>
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#include <net/cfg802154.h>
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#include "ieee802154_i.h"
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#include "cfg.h"
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static void ieee802154_tasklet_handler(struct tasklet_struct *t)
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{
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struct ieee802154_local *local = from_tasklet(local, t, tasklet);
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struct sk_buff *skb;
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while ((skb = skb_dequeue(&local->skb_queue))) {
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switch (skb->pkt_type) {
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case IEEE802154_RX_MSG:
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/* Clear skb->pkt_type in order to not confuse kernel
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* netstack.
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*/
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skb->pkt_type = 0;
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ieee802154_rx(local, skb);
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break;
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default:
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WARN(1, "mac802154: Packet is of unknown type %d\n",
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skb->pkt_type);
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kfree_skb(skb);
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break;
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}
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}
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}
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struct ieee802154_hw *
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ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
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{
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struct wpan_phy *phy;
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struct ieee802154_local *local;
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size_t priv_size;
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if (WARN_ON(!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed ||
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!ops->start || !ops->stop || !ops->set_channel))
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return NULL;
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/* Ensure 32-byte alignment of our private data and hw private data.
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* We use the wpan_phy priv data for both our ieee802154_local and for
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* the driver's private data
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*
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* in memory it'll be like this:
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*
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* +-------------------------+
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* | struct wpan_phy |
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* +-------------------------+
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* | struct ieee802154_local |
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* +-------------------------+
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* | driver's private data |
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* +-------------------------+
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*
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* Due to ieee802154 layer isn't aware of driver and MAC structures,
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* so lets align them here.
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*/
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priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
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phy = wpan_phy_new(&mac802154_config_ops, priv_size);
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if (!phy) {
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pr_err("failure to allocate master IEEE802.15.4 device\n");
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return NULL;
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}
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phy->privid = mac802154_wpan_phy_privid;
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local = wpan_phy_priv(phy);
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local->phy = phy;
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local->hw.phy = local->phy;
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local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
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local->ops = ops;
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INIT_LIST_HEAD(&local->interfaces);
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mutex_init(&local->iflist_mtx);
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tasklet_setup(&local->tasklet, ieee802154_tasklet_handler);
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skb_queue_head_init(&local->skb_queue);
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INIT_WORK(&local->tx_work, ieee802154_xmit_worker);
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/* init supported flags with 802.15.4 default ranges */
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phy->supported.max_minbe = 8;
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phy->supported.min_maxbe = 3;
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phy->supported.max_maxbe = 8;
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phy->supported.min_frame_retries = 0;
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phy->supported.max_frame_retries = 7;
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phy->supported.max_csma_backoffs = 5;
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phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE;
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/* always supported */
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phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE);
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return &local->hw;
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}
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EXPORT_SYMBOL(ieee802154_alloc_hw);
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void ieee802154_configure_durations(struct wpan_phy *phy)
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{
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u32 duration = 0;
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switch (phy->current_page) {
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case 0:
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if (BIT(phy->current_channel) & 0x1)
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/* 868 MHz BPSK 802.15.4-2003: 20 ksym/s */
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duration = 50 * NSEC_PER_USEC;
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else if (BIT(phy->current_channel) & 0x7FE)
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/* 915 MHz BPSK 802.15.4-2003: 40 ksym/s */
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duration = 25 * NSEC_PER_USEC;
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else if (BIT(phy->current_channel) & 0x7FFF800)
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/* 2400 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
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duration = 16 * NSEC_PER_USEC;
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break;
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case 2:
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if (BIT(phy->current_channel) & 0x1)
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/* 868 MHz O-QPSK 802.15.4-2006: 25 ksym/s */
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duration = 40 * NSEC_PER_USEC;
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else if (BIT(phy->current_channel) & 0x7FE)
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/* 915 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
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duration = 16 * NSEC_PER_USEC;
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break;
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case 3:
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if (BIT(phy->current_channel) & 0x3FFF)
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/* 2.4 GHz CSS 802.15.4a-2007: 1/6 Msym/s */
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duration = 6 * NSEC_PER_USEC;
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break;
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default:
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break;
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}
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if (!duration) {
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pr_debug("Unknown PHY symbol duration\n");
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return;
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}
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phy->symbol_duration = duration;
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phy->lifs_period = (IEEE802154_LIFS_PERIOD * phy->symbol_duration) / NSEC_PER_SEC;
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phy->sifs_period = (IEEE802154_SIFS_PERIOD * phy->symbol_duration) / NSEC_PER_SEC;
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}
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EXPORT_SYMBOL(ieee802154_configure_durations);
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void ieee802154_free_hw(struct ieee802154_hw *hw)
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{
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struct ieee802154_local *local = hw_to_local(hw);
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BUG_ON(!list_empty(&local->interfaces));
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mutex_destroy(&local->iflist_mtx);
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wpan_phy_free(local->phy);
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}
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EXPORT_SYMBOL(ieee802154_free_hw);
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static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
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{
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/* TODO warn on empty symbol_duration
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* Should be done when all drivers sets this value.
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*/
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wpan_phy->lifs_period =
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(IEEE802154_LIFS_PERIOD * wpan_phy->symbol_duration) / 1000;
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wpan_phy->sifs_period =
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(IEEE802154_SIFS_PERIOD * wpan_phy->symbol_duration) / 1000;
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}
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int ieee802154_register_hw(struct ieee802154_hw *hw)
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{
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struct ieee802154_local *local = hw_to_local(hw);
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struct net_device *dev;
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int rc = -ENOSYS;
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local->workqueue =
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create_singlethread_workqueue(wpan_phy_name(local->phy));
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if (!local->workqueue) {
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rc = -ENOMEM;
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goto out;
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}
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hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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local->ifs_timer.function = ieee802154_xmit_ifs_timer;
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wpan_phy_set_dev(local->phy, local->hw.parent);
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ieee802154_setup_wpan_phy_pib(local->phy);
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ieee802154_configure_durations(local->phy);
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if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
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local->phy->supported.min_csma_backoffs = 4;
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local->phy->supported.max_csma_backoffs = 4;
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local->phy->supported.min_maxbe = 5;
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local->phy->supported.max_maxbe = 5;
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local->phy->supported.min_minbe = 3;
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local->phy->supported.max_minbe = 3;
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}
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if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
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local->phy->supported.min_frame_retries = 3;
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local->phy->supported.max_frame_retries = 3;
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}
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if (hw->flags & IEEE802154_HW_PROMISCUOUS)
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local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
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rc = wpan_phy_register(local->phy);
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if (rc < 0)
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goto out_wq;
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rtnl_lock();
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dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM,
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NL802154_IFTYPE_NODE,
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cpu_to_le64(0x0000000000000000ULL));
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if (IS_ERR(dev)) {
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rtnl_unlock();
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rc = PTR_ERR(dev);
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goto out_phy;
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}
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rtnl_unlock();
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return 0;
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out_phy:
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wpan_phy_unregister(local->phy);
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out_wq:
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destroy_workqueue(local->workqueue);
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out:
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return rc;
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}
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EXPORT_SYMBOL(ieee802154_register_hw);
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void ieee802154_unregister_hw(struct ieee802154_hw *hw)
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{
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struct ieee802154_local *local = hw_to_local(hw);
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tasklet_kill(&local->tasklet);
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flush_workqueue(local->workqueue);
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rtnl_lock();
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ieee802154_remove_interfaces(local);
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rtnl_unlock();
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destroy_workqueue(local->workqueue);
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wpan_phy_unregister(local->phy);
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}
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EXPORT_SYMBOL(ieee802154_unregister_hw);
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static int __init ieee802154_init(void)
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{
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return ieee802154_iface_init();
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}
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static void __exit ieee802154_exit(void)
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{
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ieee802154_iface_exit();
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rcu_barrier();
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}
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subsys_initcall(ieee802154_init);
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module_exit(ieee802154_exit);
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MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
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MODULE_LICENSE("GPL v2");
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