drivers/net/wireless/ti/wlcore/event.c

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2008-2009 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include "wlcore.h"
  25 #include "debug.h"
  26 #include "io.h"
  27 #include "event.h"
  28 #include "ps.h"
  29 #include "scan.h"
  30 #include "wl12xx_80211.h"
  31
  32 static void wl1271_event_rssi_trigger(struct wl1271 *wl,
  33                                       struct wl12xx_vif *wlvif,
  34                                       struct event_mailbox *mbox)
  35 {
  36         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
  37         enum nl80211_cqm_rssi_threshold_event event;
  38         s8 metric = mbox->rssi_snr_trigger_metric[0];
  39
  40         wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
  41
  42         if (metric <= wlvif->rssi_thold)
  43                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
  44         else
  45                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
  46
  47         if (event != wlvif->last_rssi_event)
  48                 ieee80211_cqm_rssi_notify(vif, event, GFP_KERNEL);
  49         wlvif->last_rssi_event = event;
  50 }
  51
  52 static void wl1271_stop_ba_event(struct wl1271 *wl, struct wl12xx_vif *wlvif)
  53 {
  54         struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
  55
  56         if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
  57                 if (!wlvif->sta.ba_rx_bitmap)
  58                         return;
  59                 ieee80211_stop_rx_ba_session(vif, wlvif->sta.ba_rx_bitmap,
  60                                              vif->bss_conf.bssid);
  61         } else {
  62                 u8 hlid;
  63                 struct wl1271_link *lnk;
  64                 for_each_set_bit(hlid, wlvif->ap.sta_hlid_map,
  65                                  WL12XX_MAX_LINKS) {
  66                         lnk = &wl->links[hlid];
  67                         if (!lnk->ba_bitmap)
  68                                 continue;
  69
  70                         ieee80211_stop_rx_ba_session(vif,
  71                                                      lnk->ba_bitmap,
  72                                                      lnk->addr);
  73                 }
  74         }
  75 }
  76
  77 static void wl12xx_event_soft_gemini_sense(struct wl1271 *wl,
  78                                                u8 enable)
  79 {
  80         struct wl12xx_vif *wlvif;
  81
  82         if (enable) {
  83                 set_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
  84         } else {
  85                 clear_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
  86                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
  87                         wl1271_recalc_rx_streaming(wl, wlvif);
  88                 }
  89         }
  90
  91 }
  92
  93 static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
  94 {
  95         wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
  96         wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
  97         wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
  98 }
  99
 100 static int wl1271_event_process(struct wl1271 *wl)
 101 {
 102         struct event_mailbox *mbox = wl->mbox;
 103         struct ieee80211_vif *vif;
 104         struct wl12xx_vif *wlvif;
 105         u32 vector;
 106         bool disconnect_sta = false;
 107         unsigned long sta_bitmap = 0;
 108         int ret;
 109
 110         wl1271_event_mbox_dump(mbox);
 111
 112         vector = le32_to_cpu(mbox->events_vector);
 113         vector &= ~(le32_to_cpu(mbox->events_mask));
 114         wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 115
 116         if (vector & SCAN_COMPLETE_EVENT_ID) {
 117                 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
 118                              mbox->scheduled_scan_status);
 119
 120                 wl1271_scan_stm(wl, wl->scan_vif);
 121         }
 122
 123         if (vector & PERIODIC_SCAN_REPORT_EVENT_ID) {
 124                 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_REPORT_EVENT "
 125                              "(status 0x%0x)", mbox->scheduled_scan_status);
 126
 127                 wl1271_scan_sched_scan_results(wl);
 128         }
 129
 130         if (vector & PERIODIC_SCAN_COMPLETE_EVENT_ID) {
 131                 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_COMPLETE_EVENT "
 132                              "(status 0x%0x)", mbox->scheduled_scan_status);
 133                 if (wl->sched_scanning) {
 134                         ieee80211_sched_scan_stopped(wl->hw);
 135                         wl->sched_scanning = false;
 136                 }
 137         }
 138
 139         if (vector & SOFT_GEMINI_SENSE_EVENT_ID)
 140                 wl12xx_event_soft_gemini_sense(wl,
 141                                                mbox->soft_gemini_sense_info);
 142
 143         /*
 144          * We are HW_MONITOR device. On beacon loss - queue
 145          * connection loss work. Cancel it on REGAINED event.
 146          */
 147         if (vector & BSS_LOSE_EVENT_ID) {
 148                 /* TODO: check for multi-role */
 149                 int delay = wl->conf.conn.synch_fail_thold *
 150                                         wl->conf.conn.bss_lose_timeout;
 151                 wl1271_info("Beacon loss detected.");
 152
 153                 /*
 154                  * if the work is already queued, it should take place. We
 155                  * don't want to delay the connection loss indication
 156                  * any more.
 157                  */
 158                 ieee80211_queue_delayed_work(wl->hw, &wl->connection_loss_work,
 159                                              msecs_to_jiffies(delay));
 160
 161                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 162                         vif = wl12xx_wlvif_to_vif(wlvif);
 163
 164                         ieee80211_cqm_rssi_notify(
 165                                         vif,
 166                                         NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
 167                                         GFP_KERNEL);
 168                 }
 169         }
 170
 171         if (vector & REGAINED_BSS_EVENT_ID) {
 172                 /* TODO: check for multi-role */
 173                 wl1271_info("Beacon regained.");
 174                 cancel_delayed_work(&wl->connection_loss_work);
 175
 176                 /* sanity check - we can't lose and gain the beacon together */
 177                 WARN(vector & BSS_LOSE_EVENT_ID,
 178                      "Concurrent beacon loss and gain from FW");
 179         }
 180
 181         if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
 182                 /* TODO: check actual multi-role support */
 183                 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
 184                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 185                         wl1271_event_rssi_trigger(wl, wlvif, mbox);
 186                 }
 187         }
 188
 189         if (vector & BA_SESSION_RX_CONSTRAINT_EVENT_ID) {
 190                 u8 role_id = mbox->role_id;
 191                 wl1271_debug(DEBUG_EVENT, "BA_SESSION_RX_CONSTRAINT_EVENT_ID. "
 192                              "ba_allowed = 0x%x, role_id=%d",
 193                              mbox->rx_ba_allowed, role_id);
 194
 195                 wl12xx_for_each_wlvif(wl, wlvif) {
 196                         if (role_id != 0xff && role_id != wlvif->role_id)
 197                                 continue;
 198
 199                         wlvif->ba_allowed = !!mbox->rx_ba_allowed;
 200                         if (!wlvif->ba_allowed)
 201                                 wl1271_stop_ba_event(wl, wlvif);
 202                 }
 203         }
 204
 205         if (vector & CHANNEL_SWITCH_COMPLETE_EVENT_ID) {
 206                 wl1271_debug(DEBUG_EVENT, "CHANNEL_SWITCH_COMPLETE_EVENT_ID. "
 207                                           "status = 0x%x",
 208                                           mbox->channel_switch_status);
 209                 /*
 210                  * That event uses for two cases:
 211                  * 1) channel switch complete with status=0
 212                  * 2) channel switch failed status=1
 213                  */
 214
 215                 /* TODO: configure only the relevant vif */
 216                 wl12xx_for_each_wlvif_sta(wl, wlvif) {
 217                         bool success;
 218
 219                         if (!test_and_clear_bit(WLVIF_FLAG_CS_PROGRESS,
 220                                                 &wlvif->flags))
 221                                 continue;
 222
 223                         success = mbox->channel_switch_status ? false : true;
 224                         vif = wl12xx_wlvif_to_vif(wlvif);
 225
 226                         ieee80211_chswitch_done(vif, success);
 227                 }
 228         }
 229
 230         if ((vector & DUMMY_PACKET_EVENT_ID)) {
 231                 wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
 232                 ret = wl1271_tx_dummy_packet(wl);
 233                 if (ret < 0)
 234                         return ret;
 235         }
 236
 237         /*
 238          * "TX retries exceeded" has a different meaning according to mode.
 239          * In AP mode the offending station is disconnected.
 240          */
 241         if (vector & MAX_TX_RETRY_EVENT_ID) {
 242                 wl1271_debug(DEBUG_EVENT, "MAX_TX_RETRY_EVENT_ID");
 243                 sta_bitmap |= le16_to_cpu(mbox->sta_tx_retry_exceeded);
 244                 disconnect_sta = true;
 245         }
 246
 247         if (vector & INACTIVE_STA_EVENT_ID) {
 248                 wl1271_debug(DEBUG_EVENT, "INACTIVE_STA_EVENT_ID");
 249                 sta_bitmap |= le16_to_cpu(mbox->sta_aging_status);
 250                 disconnect_sta = true;
 251         }
 252
 253         if (disconnect_sta) {
 254                 u32 num_packets = wl->conf.tx.max_tx_retries;
 255                 struct ieee80211_sta *sta;
 256                 const u8 *addr;
 257                 int h;
 258
 259                 for_each_set_bit(h, &sta_bitmap, WL12XX_MAX_LINKS) {
 260                         bool found = false;
 261                         /* find the ap vif connected to this sta */
 262                         wl12xx_for_each_wlvif_ap(wl, wlvif) {
 263                                 if (!test_bit(h, wlvif->ap.sta_hlid_map))
 264                                         continue;
 265                                 found = true;
 266                                 break;
 267                         }
 268                         if (!found)
 269                                 continue;
 270
 271                         vif = wl12xx_wlvif_to_vif(wlvif);
 272                         addr = wl->links[h].addr;
 273
 274                         rcu_read_lock();
 275                         sta = ieee80211_find_sta(vif, addr);
 276                         if (sta) {
 277                                 wl1271_debug(DEBUG_EVENT, "remove sta %d", h);
 278                                 ieee80211_report_low_ack(sta, num_packets);
 279                         }
 280                         rcu_read_unlock();
 281                 }
 282         }
 283         return 0;
 284 }
 285
 286 int wl1271_event_unmask(struct wl1271 *wl)
 287 {
 288         int ret;
 289
 290         ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
 291         if (ret < 0)
 292                 return ret;
 293
 294         return 0;
 295 }
 296
 297 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
 298 {
 299         int ret;
 300
 301         wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 302
 303         if (mbox_num > 1)
 304                 return -EINVAL;
 305
 306         /* first we read the mbox descriptor */
 307         ret = wlcore_read(wl, wl->mbox_ptr[mbox_num], wl->mbox,
 308                           sizeof(*wl->mbox), false);
 309         if (ret < 0)
 310                 return ret;
 311
 312         /* process the descriptor */
 313         ret = wl1271_event_process(wl);
 314         if (ret < 0)
 315                 return ret;
 316
 317         /*
 318          * TODO: we just need this because one bit is in a different
 319          * place.  Is there any better way?
 320          */
 321         ret = wl->ops->ack_event(wl);
 322
 323         return ret;
 324 }