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iwlwifi: Recover TX flow failure

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Monitors the tx statistics to detect the drop in throughput.
When the throughput drops, the ratio of the actual_ack_count and the
expected_ack_count also drops.  At the same time, the aggregated
ba_timeout (the number of ba timeout retries) also rises.  If the
actual_ack_count/expected_ack_count ratio is 0 and the number of ba
timeout retries rises to BA_TIMEOUT_MAX, no tx packets can be delivered.
Reloading the uCode and bring the system back to normal operational
state.

Signed-off-by: Trieu 'Andrew' Nguyen <trieux.t.nguyen@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
This commit is contained in:
Wey-Yi Guy 2010-03-04 13:38:59 -08:00 committed by Reinette Chatre
parent beac5498b7
commit d5a0ffa3ea
3 changed files with 67 additions and 2 deletions
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14
drivers/net/wireless/iwlwifi/iwl-agn.c
View File

@ -2916,10 +2916,21 @@ static int iwl_mac_ampdu_action(struct ieee80211_hw *hw,
return ret;
case IEEE80211_AMPDU_TX_START:
IWL_DEBUG_HT(priv, "start Tx\n");
return iwl_tx_agg_start(priv, sta->addr, tid, ssn);
ret = iwl_tx_agg_start(priv, sta->addr, tid, ssn);
if (ret == 0) {
priv->_agn.agg_tids_count++;
IWL_DEBUG_HT(priv, "priv->_agn.agg_tids_count = %u\n",
priv->_agn.agg_tids_count);
}
return ret;
case IEEE80211_AMPDU_TX_STOP:
IWL_DEBUG_HT(priv, "stop Tx\n");
ret = iwl_tx_agg_stop(priv, sta->addr, tid);
if ((ret == 0) && (priv->_agn.agg_tids_count > 0)) {
priv->_agn.agg_tids_count--;
IWL_DEBUG_HT(priv, "priv->_agn.agg_tids_count = %u\n",
priv->_agn.agg_tids_count);
}
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return 0;
else
@ -3303,6 +3314,7 @@ static int iwl_init_drv(struct iwl_priv *priv)
priv->iw_mode = NL80211_IFTYPE_STATION;
priv->current_ht_config.smps = IEEE80211_SMPS_STATIC;
priv->missed_beacon_threshold = IWL_MISSED_BEACON_THRESHOLD_DEF;
priv->_agn.agg_tids_count = 0;
/* initialize force reset */
priv->force_reset[IWL_RF_RESET].reset_duration =

5
drivers/net/wireless/iwlwifi/iwl-dev.h
View File

@ -1300,6 +1300,11 @@ struct iwl_priv {
int ict_index;
u32 inta;
bool use_ict;
/*
* reporting the number of tids has AGG on. 0 means
* no AGGREGATION
*/
u8 agg_tids_count;
} _agn;
#endif
};

50
drivers/net/wireless/iwlwifi/iwl-rx.c
View File

@ -616,9 +616,18 @@ static void iwl_accumulative_statistics(struct iwl_priv *priv,
#define REG_RECALIB_PERIOD (60)
/* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
#define ACK_CNT_RATIO (50)
#define BA_TIMEOUT_CNT (5)
#define BA_TIMEOUT_MAX (16)
#define PLCP_MSG "plcp_err exceeded %u, %u, %u, %u, %u, %d, %u mSecs\n"
/*
* This function checks for plcp error.
* This function checks for plcp error, ACK count ratios, aggregated BA
* timeout retries.
* - When the ACK count ratio is 0 and aggregated BA timeout retries is
* exceeding the BA_TIMEOUT_MAX, it will recover the failure by resetting
* the firmware.
* - When the plcp error is exceeding the thresholds, it will reset the radio
* to improve the throughput.
*/
@ -628,6 +637,45 @@ void iwl_recover_from_statistics(struct iwl_priv *priv,
int combined_plcp_delta;
unsigned int plcp_msec;
unsigned long plcp_received_jiffies;
int actual_ack_cnt_delta;
int expected_ack_cnt_delta;
int ba_timeout_delta;
actual_ack_cnt_delta =
le32_to_cpu(pkt->u.stats.tx.actual_ack_cnt) -
le32_to_cpu(priv->statistics.tx.actual_ack_cnt);
expected_ack_cnt_delta =
le32_to_cpu(pkt->u.stats.tx.expected_ack_cnt) -
le32_to_cpu(priv->statistics.tx.expected_ack_cnt);
ba_timeout_delta =
le32_to_cpu(pkt->u.stats.tx.agg.ba_timeout) -
le32_to_cpu(priv->statistics.tx.agg.ba_timeout);
if ((priv->_agn.agg_tids_count > 0) &&
(expected_ack_cnt_delta > 0) &&
(((actual_ack_cnt_delta * 100) / expected_ack_cnt_delta)
< ACK_CNT_RATIO) &&
(ba_timeout_delta > BA_TIMEOUT_CNT)) {
IWL_DEBUG_RADIO(priv, "actual_ack_cnt delta = %d,"
" expected_ack_cnt = %d\n",
actual_ack_cnt_delta, expected_ack_cnt_delta);
#ifdef CONFIG_IWLWIFI_DEBUG
IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta = %d\n",
priv->delta_statistics.tx.rx_detected_cnt);
IWL_DEBUG_RADIO(priv,
"ack_or_ba_timeout_collision delta = %d\n",
priv->delta_statistics.tx.
ack_or_ba_timeout_collision);
#endif
IWL_DEBUG_RADIO(priv, "agg ba_timeout delta = %d\n",
ba_timeout_delta);
if ((actual_ack_cnt_delta == 0) &&
(ba_timeout_delta >= BA_TIMEOUT_MAX)) {
IWL_DEBUG_RADIO(priv,
"call iwl_force_reset(IWL_FW_RESET)\n");
iwl_force_reset(priv, IWL_FW_RESET);
}
}
/*
* check for plcp_err and trigger radio reset if it exceeds