drivers/net/wireless/iwlwifi/iwl-agn-rx.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/sched.h>
  34
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37 #include "iwl-agn-calib.h"
  38 #include "iwl-sta.h"
  39 #include "iwl-io.h"
  40 #include "iwl-helpers.h"
  41 #include "iwl-agn-hw.h"
  42 #include "iwl-agn.h"
  43
  44 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
  45                                 struct iwl_rx_mem_buffer *rxb)
  46
  47 {
  48         struct iwl_rx_packet *pkt = rxb_addr(rxb);
  49         struct iwl_missed_beacon_notif *missed_beacon;
  50
  51         missed_beacon = &pkt->u.missed_beacon;
  52         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
  53             priv->missed_beacon_threshold) {
  54                 IWL_DEBUG_CALIB(priv,
  55                     "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
  56                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
  57                     le32_to_cpu(missed_beacon->total_missed_becons),
  58                     le32_to_cpu(missed_beacon->num_recvd_beacons),
  59                     le32_to_cpu(missed_beacon->num_expected_beacons));
  60                 if (!test_bit(STATUS_SCANNING, &priv->status))
  61                         iwl_init_sensitivity(priv);
  62         }
  63 }
  64
  65 /* Calculate noise level, based on measurements during network silence just
  66  *   before arriving beacon.  This measurement can be done only if we know
  67  *   exactly when to expect beacons, therefore only when we're associated. */
  68 static void iwl_rx_calc_noise(struct iwl_priv *priv)
  69 {
  70         struct statistics_rx_non_phy *rx_info;
  71         int num_active_rx = 0;
  72         int total_silence = 0;
  73         int bcn_silence_a, bcn_silence_b, bcn_silence_c;
  74         int last_rx_noise;
  75
  76         if (iwl_bt_statistics(priv))
  77                 rx_info = &(priv->_agn.statistics_bt.rx.general.common);
  78         else
  79                 rx_info = &(priv->_agn.statistics.rx.general);
  80         bcn_silence_a =
  81                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
  82         bcn_silence_b =
  83                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
  84         bcn_silence_c =
  85                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
  86
  87         if (bcn_silence_a) {
  88                 total_silence += bcn_silence_a;
  89                 num_active_rx++;
  90         }
  91         if (bcn_silence_b) {
  92                 total_silence += bcn_silence_b;
  93                 num_active_rx++;
  94         }
  95         if (bcn_silence_c) {
  96                 total_silence += bcn_silence_c;
  97                 num_active_rx++;
  98         }
  99
 100         /* Average among active antennas */
 101         if (num_active_rx)
 102                 last_rx_noise = (total_silence / num_active_rx) - 107;
 103         else
 104                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 105
 106         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 107                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 108                         last_rx_noise);
 109 }
 110
 111 #ifdef CONFIG_IWLWIFI_DEBUGFS
 112 /*
 113  *  based on the assumption of all statistics counter are in DWORD
 114  *  FIXME: This function is for debugging, do not deal with
 115  *  the case of counters roll-over.
 116  */
 117 static void iwl_accumulative_statistics(struct iwl_priv *priv,
 118                                         __le32 *stats)
 119 {
 120         int i, size;
 121         __le32 *prev_stats;
 122         u32 *accum_stats;
 123         u32 *delta, *max_delta;
 124         struct statistics_general_common *general, *accum_general;
 125         struct statistics_tx *tx, *accum_tx;
 126
 127         if (iwl_bt_statistics(priv)) {
 128                 prev_stats = (__le32 *)&priv->_agn.statistics_bt;
 129                 accum_stats = (u32 *)&priv->_agn.accum_statistics_bt;
 130                 size = sizeof(struct iwl_bt_notif_statistics);
 131                 general = &priv->_agn.statistics_bt.general.common;
 132                 accum_general = &priv->_agn.accum_statistics_bt.general.common;
 133                 tx = &priv->_agn.statistics_bt.tx;
 134                 accum_tx = &priv->_agn.accum_statistics_bt.tx;
 135                 delta = (u32 *)&priv->_agn.delta_statistics_bt;
 136                 max_delta = (u32 *)&priv->_agn.max_delta_bt;
 137         } else {
 138                 prev_stats = (__le32 *)&priv->_agn.statistics;
 139                 accum_stats = (u32 *)&priv->_agn.accum_statistics;
 140                 size = sizeof(struct iwl_notif_statistics);
 141                 general = &priv->_agn.statistics.general.common;
 142                 accum_general = &priv->_agn.accum_statistics.general.common;
 143                 tx = &priv->_agn.statistics.tx;
 144                 accum_tx = &priv->_agn.accum_statistics.tx;
 145                 delta = (u32 *)&priv->_agn.delta_statistics;
 146                 max_delta = (u32 *)&priv->_agn.max_delta;
 147         }
 148         for (i = sizeof(__le32); i < size;
 149              i += sizeof(__le32), stats++, prev_stats++, delta++,
 150              max_delta++, accum_stats++) {
 151                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
 152                         *delta = (le32_to_cpu(*stats) -
 153                                 le32_to_cpu(*prev_stats));
 154                         *accum_stats += *delta;
 155                         if (*delta > *max_delta)
 156                                 *max_delta = *delta;
 157                 }
 158         }
 159
 160         /* reset accumulative statistics for "no-counter" type statistics */
 161         accum_general->temperature = general->temperature;
 162         accum_general->temperature_m = general->temperature_m;
 163         accum_general->ttl_timestamp = general->ttl_timestamp;
 164         accum_tx->tx_power.ant_a = tx->tx_power.ant_a;
 165         accum_tx->tx_power.ant_b = tx->tx_power.ant_b;
 166         accum_tx->tx_power.ant_c = tx->tx_power.ant_c;
 167 }
 168 #endif
 169
 170 #define REG_RECALIB_PERIOD (60)
 171
 172 /**
 173  * iwl_good_plcp_health - checks for plcp error.
 174  *
 175  * When the plcp error is exceeding the thresholds, reset the radio
 176  * to improve the throughput.
 177  */
 178 bool iwl_good_plcp_health(struct iwl_priv *priv,
 179                                 struct iwl_rx_packet *pkt)
 180 {
 181         bool rc = true;
 182         int combined_plcp_delta;
 183         unsigned int plcp_msec;
 184         unsigned long plcp_received_jiffies;
 185
 186         if (priv->cfg->base_params->plcp_delta_threshold ==
 187             IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 188                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 189                 return rc;
 190         }
 191
 192         /*
 193          * check for plcp_err and trigger radio reset if it exceeds
 194          * the plcp error threshold plcp_delta.
 195          */
 196         plcp_received_jiffies = jiffies;
 197         plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies -
 198                                         (long) priv->plcp_jiffies);
 199         priv->plcp_jiffies = plcp_received_jiffies;
 200         /*
 201          * check to make sure plcp_msec is not 0 to prevent division
 202          * by zero.
 203          */
 204         if (plcp_msec) {
 205                 struct statistics_rx_phy *ofdm;
 206                 struct statistics_rx_ht_phy *ofdm_ht;
 207
 208                 if (iwl_bt_statistics(priv)) {
 209                         ofdm = &pkt->u.stats_bt.rx.ofdm;
 210                         ofdm_ht = &pkt->u.stats_bt.rx.ofdm_ht;
 211                         combined_plcp_delta =
 212                            (le32_to_cpu(ofdm->plcp_err) -
 213                            le32_to_cpu(priv->_agn.statistics_bt.
 214                                        rx.ofdm.plcp_err)) +
 215                            (le32_to_cpu(ofdm_ht->plcp_err) -
 216                            le32_to_cpu(priv->_agn.statistics_bt.
 217                                        rx.ofdm_ht.plcp_err));
 218                 } else {
 219                         ofdm = &pkt->u.stats.rx.ofdm;
 220                         ofdm_ht = &pkt->u.stats.rx.ofdm_ht;
 221                         combined_plcp_delta =
 222                             (le32_to_cpu(ofdm->plcp_err) -
 223                             le32_to_cpu(priv->_agn.statistics.
 224                                         rx.ofdm.plcp_err)) +
 225                             (le32_to_cpu(ofdm_ht->plcp_err) -
 226                             le32_to_cpu(priv->_agn.statistics.
 227                                         rx.ofdm_ht.plcp_err));
 228                 }
 229
 230                 if ((combined_plcp_delta > 0) &&
 231                     ((combined_plcp_delta * 100) / plcp_msec) >
 232                         priv->cfg->base_params->plcp_delta_threshold) {
 233                         /*
 234                          * if plcp_err exceed the threshold,
 235                          * the following data is printed in csv format:
 236                          *    Text: plcp_err exceeded %d,
 237                          *    Received ofdm.plcp_err,
 238                          *    Current ofdm.plcp_err,
 239                          *    Received ofdm_ht.plcp_err,
 240                          *    Current ofdm_ht.plcp_err,
 241                          *    combined_plcp_delta,
 242                          *    plcp_msec
 243                          */
 244                         IWL_DEBUG_RADIO(priv, "plcp_err exceeded %u, "
 245                                 "%u, %u, %u, %u, %d, %u mSecs\n",
 246                                 priv->cfg->base_params->plcp_delta_threshold,
 247                                 le32_to_cpu(ofdm->plcp_err),
 248                                 le32_to_cpu(ofdm->plcp_err),
 249                                 le32_to_cpu(ofdm_ht->plcp_err),
 250                                 le32_to_cpu(ofdm_ht->plcp_err),
 251                                 combined_plcp_delta, plcp_msec);
 252
 253                         rc = false;
 254                 }
 255         }
 256         return rc;
 257 }
 258
 259 void iwl_rx_statistics(struct iwl_priv *priv,
 260                               struct iwl_rx_mem_buffer *rxb)
 261 {
 262         int change;
 263         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 264
 265         if (iwl_bt_statistics(priv)) {
 266                 IWL_DEBUG_RX(priv,
 267                              "Statistics notification received (%d vs %d).\n",
 268                              (int)sizeof(struct iwl_bt_notif_statistics),
 269                              le32_to_cpu(pkt->len_n_flags) &
 270                              FH_RSCSR_FRAME_SIZE_MSK);
 271
 272                 change = ((priv->_agn.statistics_bt.general.common.temperature !=
 273                            pkt->u.stats_bt.general.common.temperature) ||
 274                            ((priv->_agn.statistics_bt.flag &
 275                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 276                            (pkt->u.stats_bt.flag &
 277                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 278 #ifdef CONFIG_IWLWIFI_DEBUGFS
 279                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats_bt);
 280 #endif
 281
 282         } else {
 283                 IWL_DEBUG_RX(priv,
 284                              "Statistics notification received (%d vs %d).\n",
 285                              (int)sizeof(struct iwl_notif_statistics),
 286                              le32_to_cpu(pkt->len_n_flags) &
 287                              FH_RSCSR_FRAME_SIZE_MSK);
 288
 289                 change = ((priv->_agn.statistics.general.common.temperature !=
 290                            pkt->u.stats.general.common.temperature) ||
 291                            ((priv->_agn.statistics.flag &
 292                            STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 293                            (pkt->u.stats.flag &
 294                            STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 295 #ifdef CONFIG_IWLWIFI_DEBUGFS
 296                 iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 297 #endif
 298
 299         }
 300
 301         iwl_recover_from_statistics(priv, pkt);
 302
 303         if (iwl_bt_statistics(priv))
 304                 memcpy(&priv->_agn.statistics_bt, &pkt->u.stats_bt,
 305                         sizeof(priv->_agn.statistics_bt));
 306         else
 307                 memcpy(&priv->_agn.statistics, &pkt->u.stats,
 308                         sizeof(priv->_agn.statistics));
 309
 310         set_bit(STATUS_STATISTICS, &priv->status);
 311
 312         /* Reschedule the statistics timer to occur in
 313          * REG_RECALIB_PERIOD seconds to ensure we get a
 314          * thermal update even if the uCode doesn't give
 315          * us one */
 316         mod_timer(&priv->statistics_periodic, jiffies +
 317                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 318
 319         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 320             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 321                 iwl_rx_calc_noise(priv);
 322                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 323         }
 324         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 325                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 326 }
 327
 328 void iwl_reply_statistics(struct iwl_priv *priv,
 329                               struct iwl_rx_mem_buffer *rxb)
 330 {
 331         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 332
 333         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 334 #ifdef CONFIG_IWLWIFI_DEBUGFS
 335                 memset(&priv->_agn.accum_statistics, 0,
 336                         sizeof(struct iwl_notif_statistics));
 337                 memset(&priv->_agn.delta_statistics, 0,
 338                         sizeof(struct iwl_notif_statistics));
 339                 memset(&priv->_agn.max_delta, 0,
 340                         sizeof(struct iwl_notif_statistics));
 341                 memset(&priv->_agn.accum_statistics_bt, 0,
 342                         sizeof(struct iwl_bt_notif_statistics));
 343                 memset(&priv->_agn.delta_statistics_bt, 0,
 344                         sizeof(struct iwl_bt_notif_statistics));
 345                 memset(&priv->_agn.max_delta_bt, 0,
 346                         sizeof(struct iwl_bt_notif_statistics));
 347 #endif
 348                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 349         }
 350         iwl_rx_statistics(priv, rxb);
 351 }