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947 lines
24 KiB
947 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/****************************************************************************** |
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* |
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* Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved. |
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* |
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* Contact Information: |
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* Intel Linux Wireless <[email protected]> |
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
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* |
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*****************************************************************************/ |
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#include <linux/kernel.h> |
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#include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <net/mac80211.h> |
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|
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/delay.h> |
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#include <linux/workqueue.h> |
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#include "commands.h" |
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#include "3945.h" |
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#define RS_NAME "iwl-3945-rs" |
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static s32 il3945_expected_tpt_g[RATE_COUNT_3945] = { |
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7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202 |
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}; |
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static s32 il3945_expected_tpt_g_prot[RATE_COUNT_3945] = { |
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7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125 |
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}; |
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static s32 il3945_expected_tpt_a[RATE_COUNT_3945] = { |
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0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186 |
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}; |
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static s32 il3945_expected_tpt_b[RATE_COUNT_3945] = { |
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7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0 |
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}; |
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struct il3945_tpt_entry { |
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s8 min_rssi; |
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u8 idx; |
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}; |
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static struct il3945_tpt_entry il3945_tpt_table_a[] = { |
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{-60, RATE_54M_IDX}, |
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{-64, RATE_48M_IDX}, |
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{-72, RATE_36M_IDX}, |
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{-80, RATE_24M_IDX}, |
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{-84, RATE_18M_IDX}, |
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{-85, RATE_12M_IDX}, |
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{-87, RATE_9M_IDX}, |
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{-89, RATE_6M_IDX} |
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}; |
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static struct il3945_tpt_entry il3945_tpt_table_g[] = { |
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{-60, RATE_54M_IDX}, |
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{-64, RATE_48M_IDX}, |
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{-68, RATE_36M_IDX}, |
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{-80, RATE_24M_IDX}, |
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{-84, RATE_18M_IDX}, |
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{-85, RATE_12M_IDX}, |
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{-86, RATE_11M_IDX}, |
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{-88, RATE_5M_IDX}, |
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{-90, RATE_2M_IDX}, |
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{-92, RATE_1M_IDX} |
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}; |
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#define RATE_MAX_WINDOW 62 |
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#define RATE_FLUSH (3*HZ) |
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#define RATE_WIN_FLUSH (HZ/2) |
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#define IL39_RATE_HIGH_TH 11520 |
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#define IL_SUCCESS_UP_TH 8960 |
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#define IL_SUCCESS_DOWN_TH 10880 |
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#define RATE_MIN_FAILURE_TH 6 |
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#define RATE_MIN_SUCCESS_TH 8 |
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#define RATE_DECREASE_TH 1920 |
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#define RATE_RETRY_TH 15 |
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static u8 |
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il3945_get_rate_idx_by_rssi(s32 rssi, enum nl80211_band band) |
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{ |
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u32 idx = 0; |
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u32 table_size = 0; |
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struct il3945_tpt_entry *tpt_table = NULL; |
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|
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if (rssi < IL_MIN_RSSI_VAL || rssi > IL_MAX_RSSI_VAL) |
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rssi = IL_MIN_RSSI_VAL; |
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|
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switch (band) { |
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case NL80211_BAND_2GHZ: |
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tpt_table = il3945_tpt_table_g; |
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table_size = ARRAY_SIZE(il3945_tpt_table_g); |
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break; |
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case NL80211_BAND_5GHZ: |
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tpt_table = il3945_tpt_table_a; |
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table_size = ARRAY_SIZE(il3945_tpt_table_a); |
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break; |
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default: |
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BUG(); |
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break; |
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} |
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|
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while (idx < table_size && rssi < tpt_table[idx].min_rssi) |
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idx++; |
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idx = min(idx, table_size - 1); |
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|
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return tpt_table[idx].idx; |
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} |
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static void |
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il3945_clear_win(struct il3945_rate_scale_data *win) |
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{ |
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win->data = 0; |
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win->success_counter = 0; |
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win->success_ratio = -1; |
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win->counter = 0; |
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win->average_tpt = IL_INVALID_VALUE; |
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win->stamp = 0; |
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} |
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|
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/* |
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* il3945_rate_scale_flush_wins - flush out the rate scale wins |
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* |
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* Returns the number of wins that have gathered data but were |
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* not flushed. If there were any that were not flushed, then |
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* reschedule the rate flushing routine. |
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*/ |
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static int |
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il3945_rate_scale_flush_wins(struct il3945_rs_sta *rs_sta) |
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{ |
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int unflushed = 0; |
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int i; |
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unsigned long flags; |
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struct il_priv *il __maybe_unused = rs_sta->il; |
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|
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/* |
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* For each rate, if we have collected data on that rate |
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* and it has been more than RATE_WIN_FLUSH |
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* since we flushed, clear out the gathered stats |
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*/ |
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for (i = 0; i < RATE_COUNT_3945; i++) { |
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if (!rs_sta->win[i].counter) |
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continue; |
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|
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spin_lock_irqsave(&rs_sta->lock, flags); |
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if (time_after(jiffies, rs_sta->win[i].stamp + RATE_WIN_FLUSH)) { |
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D_RATE("flushing %d samples of rate " "idx %d\n", |
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rs_sta->win[i].counter, i); |
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il3945_clear_win(&rs_sta->win[i]); |
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} else |
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unflushed++; |
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spin_unlock_irqrestore(&rs_sta->lock, flags); |
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} |
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return unflushed; |
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} |
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#define RATE_FLUSH_MAX 5000 /* msec */ |
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#define RATE_FLUSH_MIN 50 /* msec */ |
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#define IL_AVERAGE_PACKETS 1500 |
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|
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static void |
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il3945_bg_rate_scale_flush(struct timer_list *t) |
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{ |
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struct il3945_rs_sta *rs_sta = from_timer(rs_sta, t, rate_scale_flush); |
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struct il_priv *il __maybe_unused = rs_sta->il; |
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int unflushed = 0; |
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unsigned long flags; |
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u32 packet_count, duration, pps; |
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D_RATE("enter\n"); |
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unflushed = il3945_rate_scale_flush_wins(rs_sta); |
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spin_lock_irqsave(&rs_sta->lock, flags); |
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/* Number of packets Rx'd since last time this timer ran */ |
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packet_count = (rs_sta->tx_packets - rs_sta->last_tx_packets) + 1; |
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rs_sta->last_tx_packets = rs_sta->tx_packets + 1; |
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if (unflushed) { |
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duration = |
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jiffies_to_msecs(jiffies - rs_sta->last_partial_flush); |
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D_RATE("Tx'd %d packets in %dms\n", packet_count, duration); |
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/* Determine packets per second */ |
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if (duration) |
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pps = (packet_count * 1000) / duration; |
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else |
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pps = 0; |
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if (pps) { |
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duration = (IL_AVERAGE_PACKETS * 1000) / pps; |
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if (duration < RATE_FLUSH_MIN) |
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duration = RATE_FLUSH_MIN; |
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else if (duration > RATE_FLUSH_MAX) |
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duration = RATE_FLUSH_MAX; |
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} else |
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duration = RATE_FLUSH_MAX; |
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rs_sta->flush_time = msecs_to_jiffies(duration); |
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D_RATE("new flush period: %d msec ave %d\n", duration, |
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packet_count); |
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mod_timer(&rs_sta->rate_scale_flush, |
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jiffies + rs_sta->flush_time); |
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rs_sta->last_partial_flush = jiffies; |
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} else { |
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rs_sta->flush_time = RATE_FLUSH; |
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rs_sta->flush_pending = 0; |
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} |
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/* If there weren't any unflushed entries, we don't schedule the timer |
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* to run again */ |
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rs_sta->last_flush = jiffies; |
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spin_unlock_irqrestore(&rs_sta->lock, flags); |
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D_RATE("leave\n"); |
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} |
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/* |
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* il3945_collect_tx_data - Update the success/failure sliding win |
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* |
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* We keep a sliding win of the last 64 packets transmitted |
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* at this rate. win->data contains the bitmask of successful |
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* packets. |
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*/ |
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static void |
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il3945_collect_tx_data(struct il3945_rs_sta *rs_sta, |
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struct il3945_rate_scale_data *win, int success, |
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int retries, int idx) |
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{ |
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unsigned long flags; |
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s32 fail_count; |
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struct il_priv *il __maybe_unused = rs_sta->il; |
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|
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if (!retries) { |
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D_RATE("leave: retries == 0 -- should be at least 1\n"); |
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return; |
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} |
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spin_lock_irqsave(&rs_sta->lock, flags); |
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/* |
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* Keep track of only the latest 62 tx frame attempts in this rate's |
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* history win; anything older isn't really relevant any more. |
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* If we have filled up the sliding win, drop the oldest attempt; |
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* if the oldest attempt (highest bit in bitmap) shows "success", |
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* subtract "1" from the success counter (this is the main reason |
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* we keep these bitmaps!). |
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* */ |
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while (retries > 0) { |
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if (win->counter >= RATE_MAX_WINDOW) { |
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|
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/* remove earliest */ |
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win->counter = RATE_MAX_WINDOW - 1; |
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if (win->data & (1ULL << (RATE_MAX_WINDOW - 1))) { |
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win->data &= ~(1ULL << (RATE_MAX_WINDOW - 1)); |
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win->success_counter--; |
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} |
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} |
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|
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/* Increment frames-attempted counter */ |
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win->counter++; |
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|
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/* Shift bitmap by one frame (throw away oldest history), |
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* OR in "1", and increment "success" if this |
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* frame was successful. */ |
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win->data <<= 1; |
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if (success > 0) { |
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win->success_counter++; |
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win->data |= 0x1; |
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success--; |
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} |
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retries--; |
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} |
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/* Calculate current success ratio, avoid divide-by-0! */ |
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if (win->counter > 0) |
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win->success_ratio = |
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128 * (100 * win->success_counter) / win->counter; |
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else |
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win->success_ratio = IL_INVALID_VALUE; |
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fail_count = win->counter - win->success_counter; |
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/* Calculate average throughput, if we have enough history. */ |
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if (fail_count >= RATE_MIN_FAILURE_TH || |
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win->success_counter >= RATE_MIN_SUCCESS_TH) |
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win->average_tpt = |
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((win->success_ratio * rs_sta->expected_tpt[idx] + |
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64) / 128); |
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else |
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win->average_tpt = IL_INVALID_VALUE; |
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/* Tag this win as having been updated */ |
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win->stamp = jiffies; |
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spin_unlock_irqrestore(&rs_sta->lock, flags); |
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} |
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/* |
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* Called after adding a new station to initialize rate scaling |
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*/ |
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void |
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il3945_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id) |
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{ |
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struct ieee80211_hw *hw = il->hw; |
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struct ieee80211_conf *conf = &il->hw->conf; |
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struct il3945_sta_priv *psta; |
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struct il3945_rs_sta *rs_sta; |
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struct ieee80211_supported_band *sband; |
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int i; |
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D_INFO("enter\n"); |
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if (sta_id == il->hw_params.bcast_id) |
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goto out; |
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psta = (struct il3945_sta_priv *)sta->drv_priv; |
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rs_sta = &psta->rs_sta; |
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sband = hw->wiphy->bands[conf->chandef.chan->band]; |
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rs_sta->il = il; |
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rs_sta->start_rate = RATE_INVALID; |
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/* default to just 802.11b */ |
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rs_sta->expected_tpt = il3945_expected_tpt_b; |
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rs_sta->last_partial_flush = jiffies; |
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rs_sta->last_flush = jiffies; |
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rs_sta->flush_time = RATE_FLUSH; |
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rs_sta->last_tx_packets = 0; |
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for (i = 0; i < RATE_COUNT_3945; i++) |
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il3945_clear_win(&rs_sta->win[i]); |
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|
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/* TODO: what is a good starting rate for STA? About middle? Maybe not |
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* the lowest or the highest rate.. Could consider using RSSI from |
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* previous packets? Need to have IEEE 802.1X auth succeed immediately |
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* after assoc.. */ |
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|
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for (i = sband->n_bitrates - 1; i >= 0; i--) { |
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if (sta->supp_rates[sband->band] & (1 << i)) { |
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rs_sta->last_txrate_idx = i; |
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break; |
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} |
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} |
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il->_3945.sta_supp_rates = sta->supp_rates[sband->band]; |
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/* For 5 GHz band it start at IL_FIRST_OFDM_RATE */ |
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if (sband->band == NL80211_BAND_5GHZ) { |
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rs_sta->last_txrate_idx += IL_FIRST_OFDM_RATE; |
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il->_3945.sta_supp_rates <<= IL_FIRST_OFDM_RATE; |
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} |
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out: |
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il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS; |
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D_INFO("leave\n"); |
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} |
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static void * |
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il3945_rs_alloc(struct ieee80211_hw *hw) |
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{ |
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return hw->priv; |
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} |
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|
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/* rate scale requires free function to be implemented */ |
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static void |
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il3945_rs_free(void *il) |
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{ |
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} |
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static void * |
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il3945_rs_alloc_sta(void *il_priv, struct ieee80211_sta *sta, gfp_t gfp) |
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{ |
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struct il3945_rs_sta *rs_sta; |
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struct il3945_sta_priv *psta = (void *)sta->drv_priv; |
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struct il_priv *il __maybe_unused = il_priv; |
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D_RATE("enter\n"); |
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rs_sta = &psta->rs_sta; |
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|
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spin_lock_init(&rs_sta->lock); |
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timer_setup(&rs_sta->rate_scale_flush, il3945_bg_rate_scale_flush, 0); |
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D_RATE("leave\n"); |
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|
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return rs_sta; |
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} |
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|
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static void |
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il3945_rs_free_sta(void *il_priv, struct ieee80211_sta *sta, void *il_sta) |
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{ |
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struct il3945_rs_sta *rs_sta = il_sta; |
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|
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/* |
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* Be careful not to use any members of il3945_rs_sta (like trying |
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* to use il_priv to print out debugging) since it may not be fully |
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* initialized at this point. |
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*/ |
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del_timer_sync(&rs_sta->rate_scale_flush); |
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} |
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|
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/* |
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* il3945_rs_tx_status - Update rate control values based on Tx results |
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* |
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* NOTE: Uses il_priv->retry_rate for the # of retries attempted by |
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* the hardware for each rate. |
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*/ |
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static void |
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il3945_rs_tx_status(void *il_rate, struct ieee80211_supported_band *sband, |
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struct ieee80211_sta *sta, void *il_sta, |
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struct sk_buff *skb) |
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{ |
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s8 retries = 0, current_count; |
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int scale_rate_idx, first_idx, last_idx; |
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unsigned long flags; |
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struct il_priv *il = (struct il_priv *)il_rate; |
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struct il3945_rs_sta *rs_sta = il_sta; |
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
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|
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D_RATE("enter\n"); |
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|
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retries = info->status.rates[0].count; |
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/* Sanity Check for retries */ |
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if (retries > RATE_RETRY_TH) |
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retries = RATE_RETRY_TH; |
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|
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first_idx = sband->bitrates[info->status.rates[0].idx].hw_value; |
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if (first_idx < 0 || first_idx >= RATE_COUNT_3945) { |
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D_RATE("leave: Rate out of bounds: %d\n", first_idx); |
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return; |
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} |
|
|
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if (!il_sta) { |
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D_RATE("leave: No STA il data to update!\n"); |
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return; |
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} |
|
|
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/* Treat uninitialized rate scaling data same as non-existing. */ |
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if (!rs_sta->il) { |
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D_RATE("leave: STA il data uninitialized!\n"); |
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return; |
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} |
|
|
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rs_sta->tx_packets++; |
|
|
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scale_rate_idx = first_idx; |
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last_idx = first_idx; |
|
|
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/* |
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* Update the win for each rate. We determine which rates |
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* were Tx'd based on the total number of retries vs. the number |
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* of retries configured for each rate -- currently set to the |
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* il value 'retry_rate' vs. rate specific |
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* |
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* On exit from this while loop last_idx indicates the rate |
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* at which the frame was finally transmitted (or failed if no |
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* ACK) |
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*/ |
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while (retries > 1) { |
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if ((retries - 1) < il->retry_rate) { |
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current_count = (retries - 1); |
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last_idx = scale_rate_idx; |
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} else { |
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current_count = il->retry_rate; |
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last_idx = il3945_rs_next_rate(il, scale_rate_idx); |
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} |
|
|
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/* Update this rate accounting for as many retries |
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* as was used for it (per current_count) */ |
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il3945_collect_tx_data(rs_sta, &rs_sta->win[scale_rate_idx], 0, |
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current_count, scale_rate_idx); |
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D_RATE("Update rate %d for %d retries.\n", scale_rate_idx, |
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current_count); |
|
|
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retries -= current_count; |
|
|
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scale_rate_idx = last_idx; |
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} |
|
|
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/* Update the last idx win with success/failure based on ACK */ |
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D_RATE("Update rate %d with %s.\n", last_idx, |
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(info->flags & IEEE80211_TX_STAT_ACK) ? "success" : "failure"); |
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il3945_collect_tx_data(rs_sta, &rs_sta->win[last_idx], |
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info->flags & IEEE80211_TX_STAT_ACK, 1, |
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last_idx); |
|
|
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/* We updated the rate scale win -- if its been more than |
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* flush_time since the last run, schedule the flush |
|
* again */ |
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spin_lock_irqsave(&rs_sta->lock, flags); |
|
|
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if (!rs_sta->flush_pending && |
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time_after(jiffies, rs_sta->last_flush + rs_sta->flush_time)) { |
|
|
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rs_sta->last_partial_flush = jiffies; |
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rs_sta->flush_pending = 1; |
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mod_timer(&rs_sta->rate_scale_flush, |
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jiffies + rs_sta->flush_time); |
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} |
|
|
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spin_unlock_irqrestore(&rs_sta->lock, flags); |
|
|
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D_RATE("leave\n"); |
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} |
|
|
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static u16 |
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il3945_get_adjacent_rate(struct il3945_rs_sta *rs_sta, u8 idx, u16 rate_mask, |
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enum nl80211_band band) |
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{ |
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u8 high = RATE_INVALID; |
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u8 low = RATE_INVALID; |
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struct il_priv *il __maybe_unused = rs_sta->il; |
|
|
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/* 802.11A walks to the next literal adjacent rate in |
|
* the rate table */ |
|
if (unlikely(band == NL80211_BAND_5GHZ)) { |
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int i; |
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u32 mask; |
|
|
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/* Find the previous rate that is in the rate mask */ |
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i = idx - 1; |
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for (mask = (1 << i); i >= 0; i--, mask >>= 1) { |
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if (rate_mask & mask) { |
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low = i; |
|
break; |
|
} |
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} |
|
|
|
/* Find the next rate that is in the rate mask */ |
|
i = idx + 1; |
|
for (mask = (1 << i); i < RATE_COUNT_3945; i++, mask <<= 1) { |
|
if (rate_mask & mask) { |
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high = i; |
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break; |
|
} |
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} |
|
|
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return (high << 8) | low; |
|
} |
|
|
|
low = idx; |
|
while (low != RATE_INVALID) { |
|
if (rs_sta->tgg) |
|
low = il3945_rates[low].prev_rs_tgg; |
|
else |
|
low = il3945_rates[low].prev_rs; |
|
if (low == RATE_INVALID) |
|
break; |
|
if (rate_mask & (1 << low)) |
|
break; |
|
D_RATE("Skipping masked lower rate: %d\n", low); |
|
} |
|
|
|
high = idx; |
|
while (high != RATE_INVALID) { |
|
if (rs_sta->tgg) |
|
high = il3945_rates[high].next_rs_tgg; |
|
else |
|
high = il3945_rates[high].next_rs; |
|
if (high == RATE_INVALID) |
|
break; |
|
if (rate_mask & (1 << high)) |
|
break; |
|
D_RATE("Skipping masked higher rate: %d\n", high); |
|
} |
|
|
|
return (high << 8) | low; |
|
} |
|
|
|
/* |
|
* il3945_rs_get_rate - find the rate for the requested packet |
|
* |
|
* Returns the ieee80211_rate structure allocated by the driver. |
|
* |
|
* The rate control algorithm has no internal mapping between hw_mode's |
|
* rate ordering and the rate ordering used by the rate control algorithm. |
|
* |
|
* The rate control algorithm uses a single table of rates that goes across |
|
* the entire A/B/G spectrum vs. being limited to just one particular |
|
* hw_mode. |
|
* |
|
* As such, we can't convert the idx obtained below into the hw_mode's |
|
* rate table and must reference the driver allocated rate table |
|
* |
|
*/ |
|
static void |
|
il3945_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta, |
|
struct ieee80211_tx_rate_control *txrc) |
|
{ |
|
struct ieee80211_supported_band *sband = txrc->sband; |
|
struct sk_buff *skb = txrc->skb; |
|
u8 low = RATE_INVALID; |
|
u8 high = RATE_INVALID; |
|
u16 high_low; |
|
int idx; |
|
struct il3945_rs_sta *rs_sta = il_sta; |
|
struct il3945_rate_scale_data *win = NULL; |
|
int current_tpt = IL_INVALID_VALUE; |
|
int low_tpt = IL_INVALID_VALUE; |
|
int high_tpt = IL_INVALID_VALUE; |
|
u32 fail_count; |
|
s8 scale_action = 0; |
|
unsigned long flags; |
|
u16 rate_mask; |
|
s8 max_rate_idx = -1; |
|
struct il_priv *il __maybe_unused = (struct il_priv *)il_r; |
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
|
|
|
D_RATE("enter\n"); |
|
|
|
/* Treat uninitialized rate scaling data same as non-existing. */ |
|
if (rs_sta && !rs_sta->il) { |
|
D_RATE("Rate scaling information not initialized yet.\n"); |
|
il_sta = NULL; |
|
} |
|
|
|
rate_mask = sta->supp_rates[sband->band]; |
|
|
|
/* get user max rate if set */ |
|
max_rate_idx = fls(txrc->rate_idx_mask) - 1; |
|
if (sband->band == NL80211_BAND_5GHZ && max_rate_idx != -1) |
|
max_rate_idx += IL_FIRST_OFDM_RATE; |
|
if (max_rate_idx < 0 || max_rate_idx >= RATE_COUNT) |
|
max_rate_idx = -1; |
|
|
|
idx = min(rs_sta->last_txrate_idx & 0xffff, RATE_COUNT_3945 - 1); |
|
|
|
if (sband->band == NL80211_BAND_5GHZ) |
|
rate_mask = rate_mask << IL_FIRST_OFDM_RATE; |
|
|
|
spin_lock_irqsave(&rs_sta->lock, flags); |
|
|
|
/* for recent assoc, choose best rate regarding |
|
* to rssi value |
|
*/ |
|
if (rs_sta->start_rate != RATE_INVALID) { |
|
if (rs_sta->start_rate < idx && |
|
(rate_mask & (1 << rs_sta->start_rate))) |
|
idx = rs_sta->start_rate; |
|
rs_sta->start_rate = RATE_INVALID; |
|
} |
|
|
|
/* force user max rate if set by user */ |
|
if (max_rate_idx != -1 && max_rate_idx < idx) { |
|
if (rate_mask & (1 << max_rate_idx)) |
|
idx = max_rate_idx; |
|
} |
|
|
|
win = &(rs_sta->win[idx]); |
|
|
|
fail_count = win->counter - win->success_counter; |
|
|
|
if (fail_count < RATE_MIN_FAILURE_TH && |
|
win->success_counter < RATE_MIN_SUCCESS_TH) { |
|
spin_unlock_irqrestore(&rs_sta->lock, flags); |
|
|
|
D_RATE("Invalid average_tpt on rate %d: " |
|
"counter: %d, success_counter: %d, " |
|
"expected_tpt is %sNULL\n", idx, win->counter, |
|
win->success_counter, |
|
rs_sta->expected_tpt ? "not " : ""); |
|
|
|
/* Can't calculate this yet; not enough history */ |
|
win->average_tpt = IL_INVALID_VALUE; |
|
goto out; |
|
|
|
} |
|
|
|
current_tpt = win->average_tpt; |
|
|
|
high_low = |
|
il3945_get_adjacent_rate(rs_sta, idx, rate_mask, sband->band); |
|
low = high_low & 0xff; |
|
high = (high_low >> 8) & 0xff; |
|
|
|
/* If user set max rate, dont allow higher than user constrain */ |
|
if (max_rate_idx != -1 && max_rate_idx < high) |
|
high = RATE_INVALID; |
|
|
|
/* Collect Measured throughputs of adjacent rates */ |
|
if (low != RATE_INVALID) |
|
low_tpt = rs_sta->win[low].average_tpt; |
|
|
|
if (high != RATE_INVALID) |
|
high_tpt = rs_sta->win[high].average_tpt; |
|
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags); |
|
|
|
scale_action = 0; |
|
|
|
/* Low success ratio , need to drop the rate */ |
|
if (win->success_ratio < RATE_DECREASE_TH || !current_tpt) { |
|
D_RATE("decrease rate because of low success_ratio\n"); |
|
scale_action = -1; |
|
/* No throughput measured yet for adjacent rates, |
|
* try increase */ |
|
} else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) { |
|
|
|
if (high != RATE_INVALID && |
|
win->success_ratio >= RATE_INCREASE_TH) |
|
scale_action = 1; |
|
else if (low != RATE_INVALID) |
|
scale_action = 0; |
|
|
|
/* Both adjacent throughputs are measured, but neither one has |
|
* better throughput; we're using the best rate, don't change |
|
* it! */ |
|
} else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE |
|
&& low_tpt < current_tpt && high_tpt < current_tpt) { |
|
|
|
D_RATE("No action -- low [%d] & high [%d] < " |
|
"current_tpt [%d]\n", low_tpt, high_tpt, current_tpt); |
|
scale_action = 0; |
|
|
|
/* At least one of the rates has better throughput */ |
|
} else { |
|
if (high_tpt != IL_INVALID_VALUE) { |
|
|
|
/* High rate has better throughput, Increase |
|
* rate */ |
|
if (high_tpt > current_tpt && |
|
win->success_ratio >= RATE_INCREASE_TH) |
|
scale_action = 1; |
|
else { |
|
D_RATE("decrease rate because of high tpt\n"); |
|
scale_action = 0; |
|
} |
|
} else if (low_tpt != IL_INVALID_VALUE) { |
|
if (low_tpt > current_tpt) { |
|
D_RATE("decrease rate because of low tpt\n"); |
|
scale_action = -1; |
|
} else if (win->success_ratio >= RATE_INCREASE_TH) { |
|
/* Lower rate has better |
|
* throughput,decrease rate */ |
|
scale_action = 1; |
|
} |
|
} |
|
} |
|
|
|
/* Sanity check; asked for decrease, but success rate or throughput |
|
* has been good at old rate. Don't change it. */ |
|
if (scale_action == -1 && low != RATE_INVALID && |
|
(win->success_ratio > RATE_HIGH_TH || |
|
current_tpt > 100 * rs_sta->expected_tpt[low])) |
|
scale_action = 0; |
|
|
|
switch (scale_action) { |
|
case -1: |
|
/* Decrease rate */ |
|
if (low != RATE_INVALID) |
|
idx = low; |
|
break; |
|
case 1: |
|
/* Increase rate */ |
|
if (high != RATE_INVALID) |
|
idx = high; |
|
|
|
break; |
|
case 0: |
|
default: |
|
/* No change */ |
|
break; |
|
} |
|
|
|
D_RATE("Selected %d (action %d) - low %d high %d\n", idx, scale_action, |
|
low, high); |
|
|
|
out: |
|
|
|
if (sband->band == NL80211_BAND_5GHZ) { |
|
if (WARN_ON_ONCE(idx < IL_FIRST_OFDM_RATE)) |
|
idx = IL_FIRST_OFDM_RATE; |
|
rs_sta->last_txrate_idx = idx; |
|
info->control.rates[0].idx = idx - IL_FIRST_OFDM_RATE; |
|
} else { |
|
rs_sta->last_txrate_idx = idx; |
|
info->control.rates[0].idx = rs_sta->last_txrate_idx; |
|
} |
|
info->control.rates[0].count = 1; |
|
|
|
D_RATE("leave: %d\n", idx); |
|
} |
|
|
|
#ifdef CONFIG_MAC80211_DEBUGFS |
|
|
|
static ssize_t |
|
il3945_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char *buff; |
|
int desc = 0; |
|
int j; |
|
ssize_t ret; |
|
struct il3945_rs_sta *lq_sta = file->private_data; |
|
|
|
buff = kmalloc(1024, GFP_KERNEL); |
|
if (!buff) |
|
return -ENOMEM; |
|
|
|
desc += |
|
sprintf(buff + desc, |
|
"tx packets=%d last rate idx=%d\n" |
|
"rate=0x%X flush time %d\n", lq_sta->tx_packets, |
|
lq_sta->last_txrate_idx, lq_sta->start_rate, |
|
jiffies_to_msecs(lq_sta->flush_time)); |
|
for (j = 0; j < RATE_COUNT_3945; j++) { |
|
desc += |
|
sprintf(buff + desc, "counter=%d success=%d %%=%d\n", |
|
lq_sta->win[j].counter, |
|
lq_sta->win[j].success_counter, |
|
lq_sta->win[j].success_ratio); |
|
} |
|
ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc); |
|
kfree(buff); |
|
return ret; |
|
} |
|
|
|
static const struct file_operations rs_sta_dbgfs_stats_table_ops = { |
|
.read = il3945_sta_dbgfs_stats_table_read, |
|
.open = simple_open, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
static void |
|
il3945_add_debugfs(void *il, void *il_sta, struct dentry *dir) |
|
{ |
|
struct il3945_rs_sta *lq_sta = il_sta; |
|
|
|
debugfs_create_file("rate_stats_table", 0600, dir, lq_sta, |
|
&rs_sta_dbgfs_stats_table_ops); |
|
} |
|
#endif |
|
|
|
/* |
|
* Initialization of rate scaling information is done by driver after |
|
* the station is added. Since mac80211 calls this function before a |
|
* station is added we ignore it. |
|
*/ |
|
static void |
|
il3945_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband, |
|
struct cfg80211_chan_def *chandef, |
|
struct ieee80211_sta *sta, void *il_sta) |
|
{ |
|
} |
|
|
|
static const struct rate_control_ops rs_ops = { |
|
.name = RS_NAME, |
|
.tx_status = il3945_rs_tx_status, |
|
.get_rate = il3945_rs_get_rate, |
|
.rate_init = il3945_rs_rate_init_stub, |
|
.alloc = il3945_rs_alloc, |
|
.free = il3945_rs_free, |
|
.alloc_sta = il3945_rs_alloc_sta, |
|
.free_sta = il3945_rs_free_sta, |
|
#ifdef CONFIG_MAC80211_DEBUGFS |
|
.add_sta_debugfs = il3945_add_debugfs, |
|
#endif |
|
|
|
}; |
|
|
|
void |
|
il3945_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id) |
|
{ |
|
struct il_priv *il = hw->priv; |
|
s32 rssi = 0; |
|
unsigned long flags; |
|
struct il3945_rs_sta *rs_sta; |
|
struct ieee80211_sta *sta; |
|
struct il3945_sta_priv *psta; |
|
|
|
D_RATE("enter\n"); |
|
|
|
rcu_read_lock(); |
|
|
|
sta = ieee80211_find_sta(il->vif, il->stations[sta_id].sta.sta.addr); |
|
if (!sta) { |
|
D_RATE("Unable to find station to initialize rate scaling.\n"); |
|
rcu_read_unlock(); |
|
return; |
|
} |
|
|
|
psta = (void *)sta->drv_priv; |
|
rs_sta = &psta->rs_sta; |
|
|
|
spin_lock_irqsave(&rs_sta->lock, flags); |
|
|
|
rs_sta->tgg = 0; |
|
switch (il->band) { |
|
case NL80211_BAND_2GHZ: |
|
/* TODO: this always does G, not a regression */ |
|
if (il->active.flags & RXON_FLG_TGG_PROTECT_MSK) { |
|
rs_sta->tgg = 1; |
|
rs_sta->expected_tpt = il3945_expected_tpt_g_prot; |
|
} else |
|
rs_sta->expected_tpt = il3945_expected_tpt_g; |
|
break; |
|
case NL80211_BAND_5GHZ: |
|
rs_sta->expected_tpt = il3945_expected_tpt_a; |
|
break; |
|
default: |
|
BUG(); |
|
break; |
|
} |
|
|
|
spin_unlock_irqrestore(&rs_sta->lock, flags); |
|
|
|
rssi = il->_3945.last_rx_rssi; |
|
if (rssi == 0) |
|
rssi = IL_MIN_RSSI_VAL; |
|
|
|
D_RATE("Network RSSI: %d\n", rssi); |
|
|
|
rs_sta->start_rate = il3945_get_rate_idx_by_rssi(rssi, il->band); |
|
|
|
D_RATE("leave: rssi %d assign rate idx: " "%d (plcp 0x%x)\n", rssi, |
|
rs_sta->start_rate, il3945_rates[rs_sta->start_rate].plcp); |
|
rcu_read_unlock(); |
|
} |
|
|
|
int |
|
il3945_rate_control_register(void) |
|
{ |
|
return ieee80211_rate_control_register(&rs_ops); |
|
} |
|
|
|
void |
|
il3945_rate_control_unregister(void) |
|
{ |
|
ieee80211_rate_control_unregister(&rs_ops); |
|
}
|
|
|