powerpc/powernv: Report size of OPAL memcons log
[linux/fpc-iii.git] / net / mac80211 / ocb.c
blob88e6ebbbe24f5562eb69df3c92ca132d15f5733b
1 /*
2 * OCB mode implementation
4 * Copyright: (c) 2014 Czech Technical University in Prague
5 * (c) 2014 Volkswagen Group Research
6 * Author: Rostislav Lisovy <rostislav.lisovy@fel.cvut.cz>
7 * Funded by: Volkswagen Group Research
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include <asm/unaligned.h>
23 #include "ieee80211_i.h"
24 #include "driver-ops.h"
25 #include "rate.h"
27 #define IEEE80211_OCB_HOUSEKEEPING_INTERVAL (60 * HZ)
28 #define IEEE80211_OCB_PEER_INACTIVITY_LIMIT (240 * HZ)
29 #define IEEE80211_OCB_MAX_STA_ENTRIES 128
31 /**
32 * enum ocb_deferred_task_flags - mac80211 OCB deferred tasks
33 * @OCB_WORK_HOUSEKEEPING: run the periodic OCB housekeeping tasks
35 * These flags are used in @wrkq_flags field of &struct ieee80211_if_ocb
37 enum ocb_deferred_task_flags {
38 OCB_WORK_HOUSEKEEPING,
41 void ieee80211_ocb_rx_no_sta(struct ieee80211_sub_if_data *sdata,
42 const u8 *bssid, const u8 *addr,
43 u32 supp_rates)
45 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
46 struct ieee80211_local *local = sdata->local;
47 struct ieee80211_chanctx_conf *chanctx_conf;
48 struct ieee80211_supported_band *sband;
49 enum nl80211_bss_scan_width scan_width;
50 struct sta_info *sta;
51 int band;
53 /* XXX: Consider removing the least recently used entry and
54 * allow new one to be added.
56 if (local->num_sta >= IEEE80211_OCB_MAX_STA_ENTRIES) {
57 net_info_ratelimited("%s: No room for a new OCB STA entry %pM\n",
58 sdata->name, addr);
59 return;
62 ocb_dbg(sdata, "Adding new OCB station %pM\n", addr);
64 rcu_read_lock();
65 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
66 if (WARN_ON_ONCE(!chanctx_conf)) {
67 rcu_read_unlock();
68 return;
70 band = chanctx_conf->def.chan->band;
71 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
72 rcu_read_unlock();
74 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
75 if (!sta)
76 return;
78 /* Add only mandatory rates for now */
79 sband = local->hw.wiphy->bands[band];
80 sta->sta.supp_rates[band] =
81 ieee80211_mandatory_rates(sband, scan_width);
83 spin_lock(&ifocb->incomplete_lock);
84 list_add(&sta->list, &ifocb->incomplete_stations);
85 spin_unlock(&ifocb->incomplete_lock);
86 ieee80211_queue_work(&local->hw, &sdata->work);
89 static struct sta_info *ieee80211_ocb_finish_sta(struct sta_info *sta)
90 __acquires(RCU)
92 struct ieee80211_sub_if_data *sdata = sta->sdata;
93 u8 addr[ETH_ALEN];
95 memcpy(addr, sta->sta.addr, ETH_ALEN);
97 ocb_dbg(sdata, "Adding new IBSS station %pM (dev=%s)\n",
98 addr, sdata->name);
100 sta_info_move_state(sta, IEEE80211_STA_AUTH);
101 sta_info_move_state(sta, IEEE80211_STA_ASSOC);
102 sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
104 rate_control_rate_init(sta);
106 /* If it fails, maybe we raced another insertion? */
107 if (sta_info_insert_rcu(sta))
108 return sta_info_get(sdata, addr);
109 return sta;
112 static void ieee80211_ocb_housekeeping(struct ieee80211_sub_if_data *sdata)
114 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
116 ocb_dbg(sdata, "Running ocb housekeeping\n");
118 ieee80211_sta_expire(sdata, IEEE80211_OCB_PEER_INACTIVITY_LIMIT);
120 mod_timer(&ifocb->housekeeping_timer,
121 round_jiffies(jiffies + IEEE80211_OCB_HOUSEKEEPING_INTERVAL));
124 void ieee80211_ocb_work(struct ieee80211_sub_if_data *sdata)
126 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
127 struct sta_info *sta;
129 if (ifocb->joined != true)
130 return;
132 sdata_lock(sdata);
134 spin_lock_bh(&ifocb->incomplete_lock);
135 while (!list_empty(&ifocb->incomplete_stations)) {
136 sta = list_first_entry(&ifocb->incomplete_stations,
137 struct sta_info, list);
138 list_del(&sta->list);
139 spin_unlock_bh(&ifocb->incomplete_lock);
141 ieee80211_ocb_finish_sta(sta);
142 rcu_read_unlock();
143 spin_lock_bh(&ifocb->incomplete_lock);
145 spin_unlock_bh(&ifocb->incomplete_lock);
147 if (test_and_clear_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags))
148 ieee80211_ocb_housekeeping(sdata);
150 sdata_unlock(sdata);
153 static void ieee80211_ocb_housekeeping_timer(unsigned long data)
155 struct ieee80211_sub_if_data *sdata = (void *)data;
156 struct ieee80211_local *local = sdata->local;
157 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
159 set_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags);
161 ieee80211_queue_work(&local->hw, &sdata->work);
164 void ieee80211_ocb_setup_sdata(struct ieee80211_sub_if_data *sdata)
166 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
168 setup_timer(&ifocb->housekeeping_timer,
169 ieee80211_ocb_housekeeping_timer,
170 (unsigned long)sdata);
171 INIT_LIST_HEAD(&ifocb->incomplete_stations);
172 spin_lock_init(&ifocb->incomplete_lock);
175 int ieee80211_ocb_join(struct ieee80211_sub_if_data *sdata,
176 struct ocb_setup *setup)
178 struct ieee80211_local *local = sdata->local;
179 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
180 u32 changed = BSS_CHANGED_OCB | BSS_CHANGED_BSSID;
181 int err;
183 if (ifocb->joined == true)
184 return -EINVAL;
186 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
187 sdata->smps_mode = IEEE80211_SMPS_OFF;
188 sdata->needed_rx_chains = sdata->local->rx_chains;
190 mutex_lock(&sdata->local->mtx);
191 err = ieee80211_vif_use_channel(sdata, &setup->chandef,
192 IEEE80211_CHANCTX_SHARED);
193 mutex_unlock(&sdata->local->mtx);
194 if (err)
195 return err;
197 ieee80211_bss_info_change_notify(sdata, changed);
199 ifocb->joined = true;
201 set_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags);
202 ieee80211_queue_work(&local->hw, &sdata->work);
204 netif_carrier_on(sdata->dev);
205 return 0;
208 int ieee80211_ocb_leave(struct ieee80211_sub_if_data *sdata)
210 struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
211 struct ieee80211_local *local = sdata->local;
212 struct sta_info *sta;
214 ifocb->joined = false;
215 sta_info_flush(sdata);
217 spin_lock_bh(&ifocb->incomplete_lock);
218 while (!list_empty(&ifocb->incomplete_stations)) {
219 sta = list_first_entry(&ifocb->incomplete_stations,
220 struct sta_info, list);
221 list_del(&sta->list);
222 spin_unlock_bh(&ifocb->incomplete_lock);
224 sta_info_free(local, sta);
225 spin_lock_bh(&ifocb->incomplete_lock);
227 spin_unlock_bh(&ifocb->incomplete_lock);
229 netif_carrier_off(sdata->dev);
230 clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
231 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_OCB);
233 mutex_lock(&sdata->local->mtx);
234 ieee80211_vif_release_channel(sdata);
235 mutex_unlock(&sdata->local->mtx);
237 skb_queue_purge(&sdata->skb_queue);
239 del_timer_sync(&sdata->u.ocb.housekeeping_timer);
240 /* If the timer fired while we waited for it, it will have
241 * requeued the work. Now the work will be running again
242 * but will not rearm the timer again because it checks
243 * whether we are connected to the network or not -- at this
244 * point we shouldn't be anymore.
247 return 0;