From 74221d07408c473721cce853ef4e0e66c0b326ba Mon Sep 17 00:00:00 2001 From: "Abbas, Mohamed" Date: Tue, 2 Dec 2008 12:14:03 -0800 Subject: [PATCH] iwl3945: Fix iwl3945 rate scaling. 3945 rate scaling was broken in recent tree. This patch fix the following: 1- Get TX response info and update rates window. 2- Rate scaling selection. 3- Flush window timer. Signed-off-by: Mohamed Abbas Signed-off-by: Reinette Chatre Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-3945-rs.c | 83 +++++++++++++--------- drivers/net/wireless/iwlwifi/iwl-3945.c | 24 +------ 2 files changed, 52 insertions(+), 55 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c index 76100d5786fb..b03dd06ceabf 100644 --- a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c +++ b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c @@ -117,9 +117,11 @@ static struct iwl3945_tpt_entry iwl3945_tpt_table_g[] = { }; #define IWL_RATE_MAX_WINDOW 62 -#define IWL_RATE_FLUSH (3*HZ/10) +#define IWL_RATE_FLUSH (3*HZ) #define IWL_RATE_WIN_FLUSH (HZ/2) #define IWL_RATE_HIGH_TH 11520 +#define IWL_SUCCESS_UP_TH 8960 +#define IWL_SUCCESS_DOWN_TH 10880 #define IWL_RATE_MIN_FAILURE_TH 8 #define IWL_RATE_MIN_SUCCESS_TH 8 #define IWL_RATE_DECREASE_TH 1920 @@ -206,6 +208,7 @@ static int iwl3945_rate_scale_flush_windows(struct iwl3945_rs_sta *rs_sta) #define IWL_RATE_FLUSH_MAX 5000 /* msec */ #define IWL_RATE_FLUSH_MIN 50 /* msec */ +#define IWL_AVERAGE_PACKETS 1500 static void iwl3945_bg_rate_scale_flush(unsigned long data) { @@ -220,8 +223,6 @@ static void iwl3945_bg_rate_scale_flush(unsigned long data) spin_lock_irqsave(&rs_sta->lock, flags); - rs_sta->flush_pending = 0; - /* Number of packets Rx'd since last time this timer ran */ packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; @@ -230,7 +231,6 @@ static void iwl3945_bg_rate_scale_flush(unsigned long data) if (unflushed) { duration = jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); -/* duration = jiffies_to_msecs(rs_sta->flush_time); */ IWL_DEBUG_RATE("Tx'd %d packets in %dms\n", packet_count, duration); @@ -242,9 +242,11 @@ static void iwl3945_bg_rate_scale_flush(unsigned long data) pps = 0; if (pps) { - duration = IWL_RATE_FLUSH_MAX / pps; + duration = (IWL_AVERAGE_PACKETS * 1000) / pps; if (duration < IWL_RATE_FLUSH_MIN) duration = IWL_RATE_FLUSH_MIN; + else if (duration > IWL_RATE_FLUSH_MAX) + duration = IWL_RATE_FLUSH_MAX; } else duration = IWL_RATE_FLUSH_MAX; @@ -257,8 +259,10 @@ static void iwl3945_bg_rate_scale_flush(unsigned long data) rs_sta->flush_time); rs_sta->last_partial_flush = jiffies; + } else { + rs_sta->flush_time = IWL_RATE_FLUSH; + rs_sta->flush_pending = 0; } - /* If there weren't any unflushed entries, we don't schedule the timer * to run again */ @@ -278,17 +282,18 @@ static void iwl3945_bg_rate_scale_flush(unsigned long data) */ static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta, struct iwl3945_rate_scale_data *window, - int success, int retries) + int success, int retries, int index) { unsigned long flags; + s32 fail_count; if (!retries) { IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n"); return; } + spin_lock_irqsave(&rs_sta->lock, flags); while (retries--) { - spin_lock_irqsave(&rs_sta->lock, flags); /* If we have filled up the window then subtract one from the * success counter if the high-bit is counting toward @@ -316,8 +321,18 @@ static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta, /* Tag this window as having been updated */ window->stamp = jiffies; - spin_unlock_irqrestore(&rs_sta->lock, flags); } + + fail_count = window->counter - window->success_counter; + if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) || + (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH)) + window->average_tpt = ((window->success_ratio * + rs_sta->expected_tpt[index] + 64) / 128); + else + window->average_tpt = IWL_INV_TPT; + + spin_unlock_irqrestore(&rs_sta->lock, flags); + } static void rs_rate_init(void *priv, struct ieee80211_supported_band *sband, @@ -429,19 +444,16 @@ static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband struct ieee80211_sta *sta, void *priv_sta, struct sk_buff *skb) { - u8 retries = 0, current_count; + s8 retries = 0, current_count; int scale_rate_index, first_index, last_index; unsigned long flags; struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_rate; struct iwl3945_rs_sta *rs_sta = priv_sta; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); - int i; IWL_DEBUG_RATE("enter\n"); - for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) - retries += info->status.rates[i].count; - retries--; + retries = info->status.rates[0].count; first_index = sband->bitrates[info->status.rates[0].idx].hw_value; if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) { @@ -469,9 +481,9 @@ static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband * at which the frame was finally transmitted (or failed if no * ACK) */ - while (retries > 0) { - if (retries < priv->retry_rate) { - current_count = retries; + while (retries > 1) { + if ((retries - 1) < priv->retry_rate) { + current_count = (retries - 1); last_index = scale_rate_index; } else { current_count = priv->retry_rate; @@ -483,15 +495,13 @@ static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband * as was used for it (per current_count) */ iwl3945_collect_tx_data(rs_sta, &rs_sta->win[scale_rate_index], - 0, current_count); + 0, current_count, scale_rate_index); IWL_DEBUG_RATE("Update rate %d for %d retries.\n", scale_rate_index, current_count); retries -= current_count; - if (retries) - scale_rate_index = - iwl3945_rs_next_rate(priv, scale_rate_index); + scale_rate_index = last_index; } @@ -502,7 +512,7 @@ static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband "success" : "failure"); iwl3945_collect_tx_data(rs_sta, &rs_sta->win[last_index], - info->flags & IEEE80211_TX_STAT_ACK, 1); + info->flags & IEEE80211_TX_STAT_ACK, 1, last_index); /* We updated the rate scale window -- if its been more than * flush_time since the last run, schedule the flush @@ -510,9 +520,10 @@ static void rs_tx_status(void *priv_rate, struct ieee80211_supported_band *sband spin_lock_irqsave(&rs_sta->lock, flags); if (!rs_sta->flush_pending && - time_after(jiffies, rs_sta->last_partial_flush + + time_after(jiffies, rs_sta->last_flush + rs_sta->flush_time)) { + rs_sta->last_partial_flush = jiffies; rs_sta->flush_pending = 1; mod_timer(&rs_sta->rate_scale_flush, jiffies + rs_sta->flush_time); @@ -660,8 +671,13 @@ static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, spin_lock_irqsave(&rs_sta->lock, flags); + /* for recent assoc, choose best rate regarding + * to rssi value + */ if (rs_sta->start_rate != IWL_RATE_INVALID) { - index = rs_sta->start_rate; + if (rs_sta->start_rate < index && + (rate_mask & (1 << rs_sta->start_rate))) + index = rs_sta->start_rate; rs_sta->start_rate = IWL_RATE_INVALID; } @@ -671,7 +687,6 @@ static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, if (((fail_count <= IWL_RATE_MIN_FAILURE_TH) && (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) { - window->average_tpt = IWL_INV_TPT; spin_unlock_irqrestore(&rs_sta->lock, flags); IWL_DEBUG_RATE("Invalid average_tpt on rate %d: " @@ -685,8 +700,6 @@ static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, } - window->average_tpt = ((window->success_ratio * - rs_sta->expected_tpt[index] + 64) / 128); current_tpt = window->average_tpt; high_low = iwl3945_get_adjacent_rate(rs_sta, index, rate_mask, @@ -734,13 +747,15 @@ static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, } } - if ((window->success_ratio > IWL_RATE_HIGH_TH) || - (current_tpt > window->average_tpt)) { - IWL_DEBUG_RATE("No action -- success_ratio [%d] > HIGH_TH or " - "current_tpt [%d] > average_tpt [%d]\n", - window->success_ratio, - current_tpt, window->average_tpt); - scale_action = 0; + if (scale_action == -1) { + if (window->success_ratio > IWL_SUCCESS_DOWN_TH) + scale_action = 0; + } else if (scale_action == 1) { + if (window->success_ratio < IWL_SUCCESS_UP_TH) { + IWL_DEBUG_RATE("No action -- success_ratio [%d] < " + "SUCCESS UP\n", window->success_ratio); + scale_action = 0; + } } switch (scale_action) { diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c index 61500044f5da..d95a15fc2602 100644 --- a/drivers/net/wireless/iwlwifi/iwl-3945.c +++ b/drivers/net/wireless/iwlwifi/iwl-3945.c @@ -337,7 +337,7 @@ static void iwl3945_rx_reply_tx(struct iwl3945_priv *priv, struct iwl3945_tx_resp *tx_resp = (void *)&pkt->u.raw[0]; u32 status = le32_to_cpu(tx_resp->status); int rate_idx; - int fail, i; + int fail; if ((index >= txq->q.n_bd) || (iwl3945_x2_queue_used(&txq->q, index) == 0)) { IWL_ERROR("Read index for DMA queue txq_id (%d) index %d " @@ -356,27 +356,9 @@ static void iwl3945_rx_reply_tx(struct iwl3945_priv *priv, rate_idx -= IWL_FIRST_OFDM_RATE; fail = tx_resp->failure_frame; - for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { - int next = iwl3945_rs_next_rate(priv, rate_idx); - info->status.rates[i].idx = rate_idx; - - /* - * Put remaining into the last count as best approximation - * of saying exactly what the hardware would have done... - */ - if ((rate_idx == next) || (i == IEEE80211_TX_MAX_RATES - 1)) { - info->status.rates[i].count = fail; - break; - } - - info->status.rates[i].count = priv->retry_rate; - fail -= priv->retry_rate; - rate_idx = next; - if (fail <= 0) - break; - } - info->status.rates[i].count++; /* add final attempt */ + info->status.rates[0].idx = rate_idx; + info->status.rates[0].count = fail + 1; /* add final attempt */ /* tx_status->rts_retry_count = tx_resp->failure_rts; */ info->flags |= ((status & TX_STATUS_MSK) == TX_STATUS_SUCCESS) ?