forked from Minki/linux
e5a9f8d046
Group station statistics by where they're (mostly) updated (TX, RX and TX-status) and group them into sub-structs of the struct sta_info. Also rename the variables since the grouping now makes it obvious where they belong. This makes it easier to identify where the statistics are updated in the code, and thus easier to think about them. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
251 lines
6.8 KiB
C
251 lines
6.8 KiB
C
/*
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* OCB mode implementation
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*
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* Copyright: (c) 2014 Czech Technical University in Prague
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* (c) 2014 Volkswagen Group Research
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* Author: Rostislav Lisovy <rostislav.lisovy@fel.cvut.cz>
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* Funded by: Volkswagen Group Research
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/if_ether.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <net/mac80211.h>
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#include <asm/unaligned.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
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#define IEEE80211_OCB_HOUSEKEEPING_INTERVAL (60 * HZ)
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#define IEEE80211_OCB_PEER_INACTIVITY_LIMIT (240 * HZ)
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#define IEEE80211_OCB_MAX_STA_ENTRIES 128
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/**
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* enum ocb_deferred_task_flags - mac80211 OCB deferred tasks
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* @OCB_WORK_HOUSEKEEPING: run the periodic OCB housekeeping tasks
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*
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* These flags are used in @wrkq_flags field of &struct ieee80211_if_ocb
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*/
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enum ocb_deferred_task_flags {
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OCB_WORK_HOUSEKEEPING,
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};
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void ieee80211_ocb_rx_no_sta(struct ieee80211_sub_if_data *sdata,
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const u8 *bssid, const u8 *addr,
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u32 supp_rates)
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{
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_chanctx_conf *chanctx_conf;
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struct ieee80211_supported_band *sband;
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enum nl80211_bss_scan_width scan_width;
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struct sta_info *sta;
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int band;
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/* XXX: Consider removing the least recently used entry and
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* allow new one to be added.
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*/
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if (local->num_sta >= IEEE80211_OCB_MAX_STA_ENTRIES) {
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net_info_ratelimited("%s: No room for a new OCB STA entry %pM\n",
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sdata->name, addr);
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return;
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}
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ocb_dbg(sdata, "Adding new OCB station %pM\n", addr);
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rcu_read_lock();
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chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
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if (WARN_ON_ONCE(!chanctx_conf)) {
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rcu_read_unlock();
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return;
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}
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band = chanctx_conf->def.chan->band;
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scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
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rcu_read_unlock();
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sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
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if (!sta)
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return;
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sta->rx_stats.last_rx = jiffies;
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/* Add only mandatory rates for now */
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sband = local->hw.wiphy->bands[band];
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sta->sta.supp_rates[band] =
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ieee80211_mandatory_rates(sband, scan_width);
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spin_lock(&ifocb->incomplete_lock);
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list_add(&sta->list, &ifocb->incomplete_stations);
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spin_unlock(&ifocb->incomplete_lock);
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ieee80211_queue_work(&local->hw, &sdata->work);
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}
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static struct sta_info *ieee80211_ocb_finish_sta(struct sta_info *sta)
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__acquires(RCU)
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{
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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u8 addr[ETH_ALEN];
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memcpy(addr, sta->sta.addr, ETH_ALEN);
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ocb_dbg(sdata, "Adding new IBSS station %pM (dev=%s)\n",
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addr, sdata->name);
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sta_info_move_state(sta, IEEE80211_STA_AUTH);
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sta_info_move_state(sta, IEEE80211_STA_ASSOC);
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sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
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rate_control_rate_init(sta);
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/* If it fails, maybe we raced another insertion? */
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if (sta_info_insert_rcu(sta))
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return sta_info_get(sdata, addr);
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return sta;
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}
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static void ieee80211_ocb_housekeeping(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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ocb_dbg(sdata, "Running ocb housekeeping\n");
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ieee80211_sta_expire(sdata, IEEE80211_OCB_PEER_INACTIVITY_LIMIT);
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mod_timer(&ifocb->housekeeping_timer,
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round_jiffies(jiffies + IEEE80211_OCB_HOUSEKEEPING_INTERVAL));
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}
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void ieee80211_ocb_work(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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struct sta_info *sta;
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if (ifocb->joined != true)
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return;
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sdata_lock(sdata);
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spin_lock_bh(&ifocb->incomplete_lock);
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while (!list_empty(&ifocb->incomplete_stations)) {
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sta = list_first_entry(&ifocb->incomplete_stations,
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struct sta_info, list);
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list_del(&sta->list);
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spin_unlock_bh(&ifocb->incomplete_lock);
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ieee80211_ocb_finish_sta(sta);
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rcu_read_unlock();
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spin_lock_bh(&ifocb->incomplete_lock);
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}
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spin_unlock_bh(&ifocb->incomplete_lock);
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if (test_and_clear_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags))
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ieee80211_ocb_housekeeping(sdata);
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sdata_unlock(sdata);
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}
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static void ieee80211_ocb_housekeeping_timer(unsigned long data)
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{
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struct ieee80211_sub_if_data *sdata = (void *)data;
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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set_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags);
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ieee80211_queue_work(&local->hw, &sdata->work);
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}
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void ieee80211_ocb_setup_sdata(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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setup_timer(&ifocb->housekeeping_timer,
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ieee80211_ocb_housekeeping_timer,
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(unsigned long)sdata);
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INIT_LIST_HEAD(&ifocb->incomplete_stations);
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spin_lock_init(&ifocb->incomplete_lock);
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}
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int ieee80211_ocb_join(struct ieee80211_sub_if_data *sdata,
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struct ocb_setup *setup)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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u32 changed = BSS_CHANGED_OCB | BSS_CHANGED_BSSID;
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int err;
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if (ifocb->joined == true)
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return -EINVAL;
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sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
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sdata->smps_mode = IEEE80211_SMPS_OFF;
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sdata->needed_rx_chains = sdata->local->rx_chains;
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mutex_lock(&sdata->local->mtx);
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err = ieee80211_vif_use_channel(sdata, &setup->chandef,
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IEEE80211_CHANCTX_SHARED);
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mutex_unlock(&sdata->local->mtx);
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if (err)
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return err;
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ieee80211_bss_info_change_notify(sdata, changed);
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ifocb->joined = true;
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set_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags);
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ieee80211_queue_work(&local->hw, &sdata->work);
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netif_carrier_on(sdata->dev);
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return 0;
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}
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int ieee80211_ocb_leave(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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ifocb->joined = false;
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sta_info_flush(sdata);
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spin_lock_bh(&ifocb->incomplete_lock);
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while (!list_empty(&ifocb->incomplete_stations)) {
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sta = list_first_entry(&ifocb->incomplete_stations,
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struct sta_info, list);
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list_del(&sta->list);
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spin_unlock_bh(&ifocb->incomplete_lock);
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sta_info_free(local, sta);
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spin_lock_bh(&ifocb->incomplete_lock);
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}
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spin_unlock_bh(&ifocb->incomplete_lock);
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netif_carrier_off(sdata->dev);
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clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
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ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_OCB);
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mutex_lock(&sdata->local->mtx);
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ieee80211_vif_release_channel(sdata);
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mutex_unlock(&sdata->local->mtx);
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skb_queue_purge(&sdata->skb_queue);
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del_timer_sync(&sdata->u.ocb.housekeeping_timer);
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/* If the timer fired while we waited for it, it will have
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* requeued the work. Now the work will be running again
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* but will not rearm the timer again because it checks
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* whether we are connected to the network or not -- at this
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* point we shouldn't be anymore.
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*/
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return 0;
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}
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