From f266526da4d78b7af639e98777d453888b039c00 Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Tue, 8 Feb 2011 09:31:57 +0100 Subject: [PATCH] iwlwifi: cleanup iwl_good_ack_health Make ack health code easies to read. Compared to previous code, we do not print debug messages when expected_ack_cnt_delta == 0 and also do check against negative deltas. Signed-off-by: Stanislaw Gruszka Acked-by: Wey-Yi Guy Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-agn.c | 69 +++++++++++++++++----------------- 1 file changed, 35 insertions(+), 34 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c index 096f8ad..50be23b 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn.c @@ -1407,34 +1407,37 @@ static void iwl_irq_tasklet(struct iwl_priv *priv) /** * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries. * - * When the ACK count ratio is 0 and aggregated BA timeout retries exceeding + * When the ACK count ratio is low and aggregated BA timeout retries exceeding * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal * operation state. */ -bool iwl_good_ack_health(struct iwl_priv *priv, - struct iwl_rx_packet *pkt) +bool iwl_good_ack_health(struct iwl_priv *priv, struct iwl_rx_packet *pkt) { - bool rc = true; - int actual_ack_cnt_delta, 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->_agn.statistics.tx.actual_ack_cnt); - expected_ack_cnt_delta = - le32_to_cpu(pkt->u.stats.tx.expected_ack_cnt) - - le32_to_cpu(priv->_agn.statistics.tx.expected_ack_cnt); - ba_timeout_delta = - le32_to_cpu(pkt->u.stats.tx.agg.ba_timeout) - - le32_to_cpu(priv->_agn.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); + int actual_delta, expected_delta, ba_timeout_delta; + struct statistics_tx *cur, *old; + + if (priv->_agn.agg_tids_count) + return true; + + cur = &pkt->u.stats.tx; + old = &priv->_agn.statistics.tx; + + actual_delta = le32_to_cpu(cur->actual_ack_cnt) - + le32_to_cpu(old->actual_ack_cnt); + expected_delta = le32_to_cpu(cur->expected_ack_cnt) - + le32_to_cpu(old->expected_ack_cnt); + + /* Values should not be negative, but we do not trust the firmware */ + if (actual_delta <= 0 || expected_delta <= 0) + return true; + + ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) - + le32_to_cpu(old->agg.ba_timeout); + + if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO && + ba_timeout_delta > BA_TIMEOUT_CNT) { + IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n", + actual_delta, expected_delta, ba_timeout_delta); #ifdef CONFIG_IWLWIFI_DEBUGFS /* @@ -1442,20 +1445,18 @@ bool iwl_good_ack_health(struct iwl_priv *priv, * statistics aren't available. If DEBUGFS is set but * DEBUG is not, these will just compile out. */ - IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta = %d\n", + IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n", priv->_agn.delta_statistics.tx.rx_detected_cnt); IWL_DEBUG_RADIO(priv, - "ack_or_ba_timeout_collision delta = %d\n", - priv->_agn.delta_statistics.tx. - ack_or_ba_timeout_collision); + "ack_or_ba_timeout_collision delta %d\n", + priv->_agn.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 && - (ba_timeout_delta >= BA_TIMEOUT_MAX)) - rc = false; + + if (ba_timeout_delta >= BA_TIMEOUT_MAX) + return false; } - return rc; + + return true; } -- 2.7.4