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iwlwifi: Monitor and recover the aggregation TX flow failure
This change 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 16, no tx packets (tcp, udp, or ping - icmp) can be delivered. The driver recovers from this situation by reseting the uCode firmware. If the actual_ack_count/expected_ ack_count ratio drops below 50% (but not 0) and the aggregated ba_timeout retries just exceed 5 (but not 16), then the driver can reset the radio to bring the throughput up. Signed-off-by: Trieu 'Andrew' Nguyen <trieux.t.nguyen@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
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@ -2941,10 +2941,21 @@ static int iwl_mac_ampdu_action(struct ieee80211_hw *hw,
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return ret;
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case IEEE80211_AMPDU_TX_START:
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IWL_DEBUG_HT(priv, "start Tx\n");
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return iwl_tx_agg_start(priv, sta->addr, tid, ssn);
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ret = iwl_tx_agg_start(priv, sta->addr, tid, ssn);
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if (ret == 0) {
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priv->agg_tids_count++;
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IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
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priv->agg_tids_count);
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}
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return ret;
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case IEEE80211_AMPDU_TX_STOP:
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IWL_DEBUG_HT(priv, "stop Tx\n");
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ret = iwl_tx_agg_stop(priv, sta->addr, tid);
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if ((ret == 0) && (priv->agg_tids_count > 0)) {
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priv->agg_tids_count--;
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IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
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priv->agg_tids_count);
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}
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if (test_bit(STATUS_EXIT_PENDING, &priv->status))
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return 0;
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else
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@ -3364,6 +3375,7 @@ static int iwl_init_drv(struct iwl_priv *priv)
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priv->iw_mode = NL80211_IFTYPE_STATION;
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priv->current_ht_config.smps = IEEE80211_SMPS_STATIC;
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priv->missed_beacon_threshold = IWL_MISSED_BEACON_THRESHOLD_DEF;
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priv->agg_tids_count = 0;
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/* Choose which receivers/antennas to use */
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if (priv->cfg->ops->hcmd->set_rxon_chain)
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@ -1072,6 +1072,9 @@ struct iwl_priv {
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/* storing the jiffies when the plcp error rate is received */
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unsigned long plcp_jiffies;
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/* reporting the number of tids has AGG on. 0 means no AGGREGATION */
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u8 agg_tids_count;
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/* force reset */
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unsigned long last_force_reset_jiffies;
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@ -616,6 +616,11 @@ static void iwl_accumulative_statistics(struct iwl_priv *priv,
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#define REG_RECALIB_PERIOD (60)
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/* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
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#define ACK_CNT_RATIO (50)
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#define BA_TIMEOUT_CNT (5)
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#define BA_TIMEOUT_MAX (16)
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#define PLCP_MSG "plcp_err exceeded %u, %u, %u, %u, %u, %d, %u mSecs\n"
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void iwl_rx_statistics(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb)
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@ -625,6 +630,9 @@ void iwl_rx_statistics(struct iwl_priv *priv,
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int combined_plcp_delta;
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unsigned int plcp_msec;
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unsigned long plcp_received_jiffies;
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int actual_ack_cnt_delta;
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int expected_ack_cnt_delta;
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int ba_timeout_delta;
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IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
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(int)sizeof(priv->statistics),
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@ -639,6 +647,44 @@ void iwl_rx_statistics(struct iwl_priv *priv,
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#ifdef CONFIG_IWLWIFI_DEBUG
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iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
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#endif
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actual_ack_cnt_delta = le32_to_cpu(pkt->u.stats.tx.actual_ack_cnt) -
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le32_to_cpu(priv->statistics.tx.actual_ack_cnt);
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expected_ack_cnt_delta = le32_to_cpu(
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pkt->u.stats.tx.expected_ack_cnt) -
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le32_to_cpu(priv->statistics.tx.expected_ack_cnt);
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ba_timeout_delta = le32_to_cpu(
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pkt->u.stats.tx.agg.ba_timeout) -
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le32_to_cpu(priv->statistics.tx.agg.ba_timeout);
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if ((priv->agg_tids_count > 0) &&
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(expected_ack_cnt_delta > 0) &&
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(((actual_ack_cnt_delta * 100) / expected_ack_cnt_delta) <
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ACK_CNT_RATIO) &&
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(ba_timeout_delta > BA_TIMEOUT_CNT)) {
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IWL_DEBUG_RADIO(priv,
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"actual_ack_cnt delta = %d, expected_ack_cnt = %d\n",
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actual_ack_cnt_delta, expected_ack_cnt_delta);
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#ifdef CONFIG_IWLWIFI_DEBUG
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IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta = %d\n",
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priv->delta_statistics.tx.rx_detected_cnt);
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IWL_DEBUG_RADIO(priv,
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"ack_or_ba_timeout_collision delta = %d\n",
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priv->delta_statistics.tx.ack_or_ba_timeout_collision);
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#endif
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IWL_DEBUG_RADIO(priv, "agg ba_timeout delta = %d\n",
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ba_timeout_delta);
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if ((actual_ack_cnt_delta == 0) &&
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(ba_timeout_delta >=
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BA_TIMEOUT_MAX)) {
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IWL_DEBUG_RADIO(priv,
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"call iwl_force_reset(IWL_FW_RESET)\n");
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iwl_force_reset(priv, IWL_FW_RESET);
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} else {
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IWL_DEBUG_RADIO(priv,
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"call iwl_force_reset(IWL_RF_RESET)\n");
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iwl_force_reset(priv, IWL_RF_RESET);
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}
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}
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/*
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* check for plcp_err and trigger radio reset if it exceeds
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* the plcp error threshold plcp_delta.
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