Pileus Git - ~andy/linux/blob - 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-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                                 = &(priv->_agn.statistics.rx.general);
  72         int num_active_rx = 0;
  73         int total_silence = 0;
  74         int bcn_silence_a =
  75                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
  76         int bcn_silence_b =
  77                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
  78         int bcn_silence_c =
  79                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
  80         int last_rx_noise;
  81
  82         if (bcn_silence_a) {
  83                 total_silence += bcn_silence_a;
  84                 num_active_rx++;
  85         }
  86         if (bcn_silence_b) {
  87                 total_silence += bcn_silence_b;
  88                 num_active_rx++;
  89         }
  90         if (bcn_silence_c) {
  91                 total_silence += bcn_silence_c;
  92                 num_active_rx++;
  93         }
  94
  95         /* Average among active antennas */
  96         if (num_active_rx)
  97                 last_rx_noise = (total_silence / num_active_rx) - 107;
  98         else
  99                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 100
 101         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 102                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 103                         last_rx_noise);
 104 }
 105
 106 #ifdef CONFIG_IWLWIFI_DEBUGFS
 107 /*
 108  *  based on the assumption of all statistics counter are in DWORD
 109  *  FIXME: This function is for debugging, do not deal with
 110  *  the case of counters roll-over.
 111  */
 112 static void iwl_accumulative_statistics(struct iwl_priv *priv,
 113                                         __le32 *stats)
 114 {
 115         int i;
 116         __le32 *prev_stats;
 117         u32 *accum_stats;
 118         u32 *delta, *max_delta;
 119
 120         prev_stats = (__le32 *)&priv->_agn.statistics;
 121         accum_stats = (u32 *)&priv->_agn.accum_statistics;
 122         delta = (u32 *)&priv->_agn.delta_statistics;
 123         max_delta = (u32 *)&priv->_agn.max_delta;
 124
 125         for (i = sizeof(__le32); i < sizeof(struct iwl_notif_statistics);
 126              i += sizeof(__le32), stats++, prev_stats++, delta++,
 127              max_delta++, accum_stats++) {
 128                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
 129                         *delta = (le32_to_cpu(*stats) -
 130                                 le32_to_cpu(*prev_stats));
 131                         *accum_stats += *delta;
 132                         if (*delta > *max_delta)
 133                                 *max_delta = *delta;
 134                 }
 135         }
 136
 137         /* reset accumulative statistics for "no-counter" type statistics */
 138         priv->_agn.accum_statistics.general.common.temperature =
 139                 priv->_agn.statistics.general.common.temperature;
 140         priv->_agn.accum_statistics.general.common.temperature_m =
 141                 priv->_agn.statistics.general.common.temperature_m;
 142         priv->_agn.accum_statistics.general.common.ttl_timestamp =
 143                 priv->_agn.statistics.general.common.ttl_timestamp;
 144         priv->_agn.accum_statistics.tx.tx_power.ant_a =
 145                 priv->_agn.statistics.tx.tx_power.ant_a;
 146         priv->_agn.accum_statistics.tx.tx_power.ant_b =
 147                 priv->_agn.statistics.tx.tx_power.ant_b;
 148         priv->_agn.accum_statistics.tx.tx_power.ant_c =
 149                 priv->_agn.statistics.tx.tx_power.ant_c;
 150 }
 151 #endif
 152
 153 #define REG_RECALIB_PERIOD (60)
 154
 155 /**
 156  * iwl_good_plcp_health - checks for plcp error.
 157  *
 158  * When the plcp error is exceeding the thresholds, reset the radio
 159  * to improve the throughput.
 160  */
 161 bool iwl_good_plcp_health(struct iwl_priv *priv,
 162                                 struct iwl_rx_packet *pkt)
 163 {
 164         bool rc = true;
 165         int combined_plcp_delta;
 166         unsigned int plcp_msec;
 167         unsigned long plcp_received_jiffies;
 168
 169         if (priv->cfg->plcp_delta_threshold ==
 170             IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
 171                 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
 172                 return rc;
 173         }
 174
 175         /*
 176          * check for plcp_err and trigger radio reset if it exceeds
 177          * the plcp error threshold plcp_delta.
 178          */
 179         plcp_received_jiffies = jiffies;
 180         plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies -
 181                                         (long) priv->plcp_jiffies);
 182         priv->plcp_jiffies = plcp_received_jiffies;
 183         /*
 184          * check to make sure plcp_msec is not 0 to prevent division
 185          * by zero.
 186          */
 187         if (plcp_msec) {
 188                 combined_plcp_delta =
 189                         (le32_to_cpu(pkt->u.stats.rx.ofdm.plcp_err) -
 190                         le32_to_cpu(priv->_agn.statistics.rx.ofdm.plcp_err)) +
 191                         (le32_to_cpu(pkt->u.stats.rx.ofdm_ht.plcp_err) -
 192                         le32_to_cpu(priv->_agn.statistics.rx.ofdm_ht.plcp_err));
 193
 194                 if ((combined_plcp_delta > 0) &&
 195                     ((combined_plcp_delta * 100) / plcp_msec) >
 196                         priv->cfg->plcp_delta_threshold) {
 197                         /*
 198                          * if plcp_err exceed the threshold,
 199                          * the following data is printed in csv format:
 200                          *    Text: plcp_err exceeded %d,
 201                          *    Received ofdm.plcp_err,
 202                          *    Current ofdm.plcp_err,
 203                          *    Received ofdm_ht.plcp_err,
 204                          *    Current ofdm_ht.plcp_err,
 205                          *    combined_plcp_delta,
 206                          *    plcp_msec
 207                          */
 208                         IWL_DEBUG_RADIO(priv, "plcp_err exceeded %u, "
 209                                 "%u, %u, %u, %u, %d, %u mSecs\n",
 210                                 priv->cfg->plcp_delta_threshold,
 211                                 le32_to_cpu(pkt->u.stats.rx.ofdm.plcp_err),
 212                                 le32_to_cpu(
 213                                        priv->_agn.statistics.rx.ofdm.plcp_err),
 214                                 le32_to_cpu(pkt->u.stats.rx.ofdm_ht.plcp_err),
 215                                 le32_to_cpu(
 216                                   priv->_agn.statistics.rx.ofdm_ht.plcp_err),
 217                                 combined_plcp_delta, plcp_msec);
 218                         rc = false;
 219                 }
 220         }
 221         return rc;
 222 }
 223
 224 void iwl_rx_statistics(struct iwl_priv *priv,
 225                               struct iwl_rx_mem_buffer *rxb)
 226 {
 227         int change;
 228         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 229
 230
 231         IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
 232                      (int)sizeof(priv->_agn.statistics),
 233                      le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK);
 234
 235         change = ((priv->_agn.statistics.general.common.temperature !=
 236                    pkt->u.stats.general.common.temperature) ||
 237                   ((priv->_agn.statistics.flag &
 238                     STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 239                    (pkt->u.stats.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 240
 241 #ifdef CONFIG_IWLWIFI_DEBUGFS
 242         iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 243 #endif
 244         iwl_recover_from_statistics(priv, pkt);
 245
 246         memcpy(&priv->_agn.statistics, &pkt->u.stats,
 247                sizeof(priv->_agn.statistics));
 248
 249         set_bit(STATUS_STATISTICS, &priv->status);
 250
 251         /* Reschedule the statistics timer to occur in
 252          * REG_RECALIB_PERIOD seconds to ensure we get a
 253          * thermal update even if the uCode doesn't give
 254          * us one */
 255         mod_timer(&priv->statistics_periodic, jiffies +
 256                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 257
 258         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 259             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 260                 iwl_rx_calc_noise(priv);
 261                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 262         }
 263         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 264                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 265 }
 266
 267 void iwl_reply_statistics(struct iwl_priv *priv,
 268                               struct iwl_rx_mem_buffer *rxb)
 269 {
 270         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 271
 272         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 273 #ifdef CONFIG_IWLWIFI_DEBUGFS
 274                 memset(&priv->_agn.accum_statistics, 0,
 275                         sizeof(struct iwl_notif_statistics));
 276                 memset(&priv->_agn.delta_statistics, 0,
 277                         sizeof(struct iwl_notif_statistics));
 278                 memset(&priv->_agn.max_delta, 0,
 279                         sizeof(struct iwl_notif_statistics));
 280 #endif
 281                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 282         }
 283         iwl_rx_statistics(priv, rxb);
 284 }