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googlers / maze / linux / 31d1e340f0e8d53804d737571b2f2bb28a74ecc5 / . / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
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/******************************************************************************
*
* Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
* Contact Information:
* James P. Ketrenos <ipw2100-admin@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
*****************************************************************************/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/wireless.h>
#include <net/mac80211.h>
#include <net/ieee80211.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include "../net/mac80211/rate.h"
#include "iwl-4965.h"
#include "iwl-core.h"
#include "iwl-helpers.h"
#define RS_NAME "iwl-4965-rs"
#define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
#define IWL_NUMBER_TRY 1
#define IWL_HT_NUMBER_TRY 3
#define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
#define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
#define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
/* max time to accum history 2 seconds */
#define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
static u8 rs_ht_to_legacy[] = {
IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
IWL_RATE_6M_INDEX,
IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
};
struct iwl4965_rate {
u32 rate_n_flags;
} __attribute__ ((packed));
/**
* struct iwl4965_rate_scale_data -- tx success history for one rate
*/
struct iwl4965_rate_scale_data {
u64 data; /* bitmap of successful frames */
s32 success_counter; /* number of frames successful */
s32 success_ratio; /* per-cent * 128 */
s32 counter; /* number of frames attempted */
s32 average_tpt; /* success ratio * expected throughput */
unsigned long stamp;
};
/**
* struct iwl4965_scale_tbl_info -- tx params and success history for all rates
*
* There are two of these in struct iwl4965_lq_sta,
* one for "active", and one for "search".
*/
struct iwl4965_scale_tbl_info {
enum iwl4965_table_type lq_type;
enum iwl4965_antenna_type antenna_type;
u8 is_SGI; /* 1 = short guard interval */
u8 is_fat; /* 1 = 40 MHz channel width */
u8 is_dup; /* 1 = duplicated data streams */
u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
struct iwl4965_rate current_rate; /* rate_n_flags, uCode API format */
struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
};
#ifdef CONFIG_IWL4965_HT
struct iwl4965_traffic_load {
unsigned long time_stamp; /* age of the oldest statistics */
u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
* slice */
u32 total; /* total num of packets during the
* last TID_MAX_TIME_DIFF */
u8 queue_count; /* number of queues that has
* been used since the last cleanup */
u8 head; /* start of the circular buffer */
};
#endif /* CONFIG_IWL4965_HT */
/**
* struct iwl4965_lq_sta -- driver's rate scaling private structure
*
* Pointer to this gets passed back and forth between driver and mac80211.
*/
struct iwl4965_lq_sta {
u8 active_tbl; /* index of active table, range 0-1 */
u8 enable_counter; /* indicates HT mode */
u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
u8 search_better_tbl; /* 1: currently trying alternate mode */
s32 last_tpt;
/* The following determine when to search for a new mode */
u32 table_count_limit;
u32 max_failure_limit; /* # failed frames before new search */
u32 max_success_limit; /* # successful frames before new search */
u32 table_count;
u32 total_failed; /* total failed frames, any/all rates */
u32 total_success; /* total successful frames, any/all rates */
u32 flush_timer; /* time staying in mode before new search */
u8 action_counter; /* # mode-switch actions tried */
u8 antenna;
u8 valid_antenna;
u8 is_green;
u8 is_dup;
enum ieee80211_band band;
u8 ibss_sta_added;
/* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
u32 supp_rates;
u16 active_rate;
u16 active_siso_rate;
u16 active_mimo_rate;
u16 active_rate_basic;
struct iwl_link_quality_cmd lq;
struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
#ifdef CONFIG_IWL4965_HT
struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
u8 tx_agg_tid_en;
#endif
#ifdef CONFIG_MAC80211_DEBUGFS
struct dentry *rs_sta_dbgfs_scale_table_file;
struct dentry *rs_sta_dbgfs_stats_table_file;
#ifdef CONFIG_IWL4965_HT
struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
#endif
struct iwl4965_rate dbg_fixed;
struct iwl_priv *drv;
#endif
};
static void rs_rate_scale_perform(struct iwl_priv *priv,
struct net_device *dev,
struct ieee80211_hdr *hdr,
struct sta_info *sta);
static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
struct iwl4965_rate *tx_mcs,
struct iwl_link_quality_cmd *tbl);
#ifdef CONFIG_MAC80211_DEBUGFS
static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
struct iwl4965_rate *mcs, int index);
#else
static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
struct iwl4965_rate *mcs, int index)
{}
#endif
/*
* Expected throughput metrics for following rates:
* 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
* "G" is the only table that supports CCK (the first 4 rates).
*/
static s32 expected_tpt_A[IWL_RATE_COUNT] = {
0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
};
static s32 expected_tpt_G[IWL_RATE_COUNT] = {
7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
};
static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
};
static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
};
static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
};
static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
};
static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
};
static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
};
static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
};
static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
};
static inline u8 iwl4965_rate_get_rate(u32 rate_n_flags)
{
return (u8)(rate_n_flags & 0xFF);
}
static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
{
window->data = 0;
window->success_counter = 0;
window->success_ratio = IWL_INVALID_VALUE;
window->counter = 0;
window->average_tpt = IWL_INVALID_VALUE;
window->stamp = 0;
}
#ifdef CONFIG_IWL4965_HT
/*
* removes the old data from the statistics. All data that is older than
* TID_MAX_TIME_DIFF, will be deleted.
*/
static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
{
/* The oldest age we want to keep */
u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
while (tl->queue_count &&
(tl->time_stamp < oldest_time)) {
tl->total -= tl->packet_count[tl->head];
tl->packet_count[tl->head] = 0;
tl->time_stamp += TID_QUEUE_CELL_SPACING;
tl->queue_count--;
tl->head++;
if (tl->head >= TID_QUEUE_MAX_SIZE)
tl->head = 0;
}
}
/*
* increment traffic load value for tid and also remove
* any old values if passed the certain time period
*/
static void rs_tl_add_packet(struct iwl4965_lq_sta *lq_data, u8 tid)
{
u32 curr_time = jiffies_to_msecs(jiffies);
u32 time_diff;
s32 index;
struct iwl4965_traffic_load *tl = NULL;
if (tid >= TID_MAX_LOAD_COUNT)
return;
tl = &lq_data->load[tid];
curr_time -= curr_time % TID_ROUND_VALUE;
/* Happens only for the first packet. Initialize the data */
if (!(tl->queue_count)) {
tl->total = 1;
tl->time_stamp = curr_time;
tl->queue_count = 1;
tl->head = 0;
tl->packet_count[0] = 1;
return;
}
time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
index = time_diff / TID_QUEUE_CELL_SPACING;
/* The history is too long: remove data that is older than */
/* TID_MAX_TIME_DIFF */
if (index >= TID_QUEUE_MAX_SIZE)
rs_tl_rm_old_stats(tl, curr_time);
index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
tl->packet_count[index] = tl->packet_count[index] + 1;
tl->total = tl->total + 1;
if ((index + 1) > tl->queue_count)
tl->queue_count = index + 1;
}
/*
get the traffic load value for tid
*/
static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
{
u32 curr_time = jiffies_to_msecs(jiffies);
u32 time_diff;
s32 index;
struct iwl4965_traffic_load *tl = NULL;
if (tid >= TID_MAX_LOAD_COUNT)
return 0;
tl = &(lq_data->load[tid]);
curr_time -= curr_time % TID_ROUND_VALUE;
if (!(tl->queue_count))
return 0;
time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
index = time_diff / TID_QUEUE_CELL_SPACING;
/* The history is too long: remove data that is older than */
/* TID_MAX_TIME_DIFF */
if (index >= TID_QUEUE_MAX_SIZE)
rs_tl_rm_old_stats(tl, curr_time);
return tl->total;
}
static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
struct iwl4965_lq_sta *lq_data, u8 tid,
struct sta_info *sta)
{
unsigned long state;
DECLARE_MAC_BUF(mac);
spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
state = sta->ampdu_mlme.tid_state_tx[tid];
spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
if (state == HT_AGG_STATE_IDLE &&
rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
print_mac(mac, sta->addr), tid);
ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
}
}
static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
struct iwl4965_lq_sta *lq_data,
struct sta_info *sta)
{
if ((tid < TID_MAX_LOAD_COUNT))
rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
else if (tid == IWL_AGG_ALL_TID)
for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
}
#endif /* CONFIG_IWLWIFI_HT */
/**
* rs_collect_tx_data - Update the success/failure sliding window
*
* We keep a sliding window of the last 62 packets transmitted
* at this rate. window->data contains the bitmask of successful
* packets.
*/
static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
int scale_index, s32 tpt, int retries,
int successes)
{
struct iwl4965_rate_scale_data *window = NULL;
u64 mask;
u8 win_size = IWL_RATE_MAX_WINDOW;
s32 fail_count;
if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
return -EINVAL;
/* Select data for current tx bit rate */
window = &(windows[scale_index]);
/*
* Keep track of only the latest 62 tx frame attempts in this rate's
* history window; anything older isn't really relevant any more.
* If we have filled up the sliding window, drop the oldest attempt;
* if the oldest attempt (highest bit in bitmap) shows "success",
* subtract "1" from the success counter (this is the main reason
* we keep these bitmaps!).
*/
while (retries > 0) {
if (window->counter >= win_size) {
window->counter = win_size - 1;
mask = 1;
mask = (mask << (win_size - 1));
if (window->data & mask) {
window->data &= ~mask;
window->success_counter =
window->success_counter - 1;
}
}
/* Increment frames-attempted counter */
window->counter++;
/* Shift bitmap by one frame (throw away oldest history),
* OR in "1", and increment "success" if this
* frame was successful. */
mask = window->data;
window->data = (mask << 1);
if (successes > 0) {
window->success_counter = window->success_counter + 1;
window->data |= 0x1;
successes--;
}
retries--;
}
/* Calculate current success ratio, avoid divide-by-0! */
if (window->counter > 0)
window->success_ratio = 128 * (100 * window->success_counter)
/ window->counter;
else
window->success_ratio = IWL_INVALID_VALUE;
fail_count = window->counter - window->success_counter;
/* Calculate average throughput, if we have enough history. */
if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
(window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
window->average_tpt = (window->success_ratio * tpt + 64) / 128;
else
window->average_tpt = IWL_INVALID_VALUE;
/* Tag this window as having been updated */
window->stamp = jiffies;
return 0;
}
/*
* Fill uCode API rate_n_flags field, based on "search" or "active" table.
*/
static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
struct iwl4965_scale_tbl_info *tbl,
int index, u8 use_green)
{
if (is_legacy(tbl->lq_type)) {
mcs_rate->rate_n_flags = iwl4965_rates[index].plcp;
if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
} else if (is_siso(tbl->lq_type)) {
if (index > IWL_LAST_OFDM_RATE)
index = IWL_LAST_OFDM_RATE;
mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_siso |
RATE_MCS_HT_MSK;
} else {
if (index > IWL_LAST_OFDM_RATE)
index = IWL_LAST_OFDM_RATE;
mcs_rate->rate_n_flags = iwl4965_rates[index].plcp_mimo |
RATE_MCS_HT_MSK;
}
switch (tbl->antenna_type) {
case ANT_BOTH:
mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
break;
case ANT_MAIN:
mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
break;
case ANT_AUX:
mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
break;
case ANT_NONE:
break;
}
if (is_legacy(tbl->lq_type))
return;
if (tbl->is_fat) {
if (tbl->is_dup)
mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
else
mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
}
if (tbl->is_SGI)
mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
if (use_green) {
mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
if (is_siso(tbl->lq_type))
mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
}
}
/*
* Interpret uCode API's rate_n_flags format,
* fill "search" or "active" tx mode table.
*/
static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
enum ieee80211_band band,
struct iwl4965_scale_tbl_info *tbl,
int *rate_idx)
{
int index;
u32 ant_msk;
index = iwl4965_hwrate_to_plcp_idx(mcs_rate->rate_n_flags);
if (index == IWL_RATE_INVALID) {
*rate_idx = -1;
return -EINVAL;
}
tbl->is_SGI = 0; /* default legacy setup */
tbl->is_fat = 0;
tbl->is_dup = 0;
tbl->antenna_type = ANT_BOTH; /* default MIMO setup */
/* legacy rate format */
if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
if (ant_msk == RATE_MCS_ANT_AB_MSK)
tbl->lq_type = LQ_NONE;
else {
if (band == IEEE80211_BAND_5GHZ)
tbl->lq_type = LQ_A;
else
tbl->lq_type = LQ_G;
if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
tbl->antenna_type = ANT_MAIN;
else
tbl->antenna_type = ANT_AUX;
}
*rate_idx = index;
/* HT rate format, SISO (might be 20 MHz legacy or 40 MHz fat width) */
} else if (iwl4965_rate_get_rate(mcs_rate->rate_n_flags)
<= IWL_RATE_SISO_60M_PLCP) {
tbl->lq_type = LQ_SISO;
ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
if (ant_msk == RATE_MCS_ANT_AB_MSK)
tbl->lq_type = LQ_NONE;
else {
if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
tbl->antenna_type = ANT_MAIN;
else
tbl->antenna_type = ANT_AUX;
}
if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
tbl->is_SGI = 1;
if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
(mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
tbl->is_fat = 1;
if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
tbl->is_dup = 1;
*rate_idx = index;
/* HT rate format, MIMO (might be 20 MHz legacy or 40 MHz fat width) */
} else {
tbl->lq_type = LQ_MIMO;
if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
tbl->is_SGI = 1;
if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
(mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
tbl->is_fat = 1;
if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
tbl->is_dup = 1;
*rate_idx = index;
}
return 0;
}
static inline void rs_toggle_antenna(struct iwl4965_rate *new_rate,
struct iwl4965_scale_tbl_info *tbl)
{
if (tbl->antenna_type == ANT_AUX) {
tbl->antenna_type = ANT_MAIN;
new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
} else {
tbl->antenna_type = ANT_AUX;
new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
}
}
static inline u8 rs_use_green(struct iwl_priv *priv,
struct ieee80211_conf *conf)
{
#ifdef CONFIG_IWL4965_HT
return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
priv->current_ht_config.is_green_field &&
!priv->current_ht_config.non_GF_STA_present);
#endif /* CONFIG_IWL4965_HT */
return 0;
}
/**
* rs_get_supported_rates - get the available rates
*
* if management frame or broadcast frame only return
* basic available rates.
*
*/
static void rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
struct ieee80211_hdr *hdr,
enum iwl4965_table_type rate_type,
u16 *data_rate)
{
if (is_legacy(rate_type))
*data_rate = lq_sta->active_rate;
else {
if (is_siso(rate_type))
*data_rate = lq_sta->active_siso_rate;
else
*data_rate = lq_sta->active_mimo_rate;
}
if (hdr && is_multicast_ether_addr(hdr->addr1) &&
lq_sta->active_rate_basic) {
*data_rate = lq_sta->active_rate_basic;
}
}
static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
{
u8 high = IWL_RATE_INVALID;
u8 low = IWL_RATE_INVALID;
/* 802.11A or ht walks to the next literal adjacent rate in
* the rate table */
if (is_a_band(rate_type) || !is_legacy(rate_type)) {
int i;
u32 mask;
/* Find the previous rate that is in the rate mask */
i = index - 1;
for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
if (rate_mask & mask) {
low = i;
break;
}
}
/* Find the next rate that is in the rate mask */
i = index + 1;
for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
if (rate_mask & mask) {
high = i;
break;
}
}
return (high << 8) | low;
}
low = index;
while (low != IWL_RATE_INVALID) {
low = iwl4965_rates[low].prev_rs;
if (low == IWL_RATE_INVALID)
break;
if (rate_mask & (1 << low))
break;
IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
}
high = index;
while (high != IWL_RATE_INVALID) {
high = iwl4965_rates[high].next_rs;
if (high == IWL_RATE_INVALID)
break;
if (rate_mask & (1 << high))
break;
IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
}
return (high << 8) | low;
}
static void rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
u8 ht_possible, struct iwl4965_rate *mcs_rate)
{
s32 low;
u16 rate_mask;
u16 high_low;
u8 switch_to_legacy = 0;
u8 is_green = lq_sta->is_green;
/* check if we need to switch from HT to legacy rates.
* assumption is that mandatory rates (1Mbps or 6Mbps)
* are always supported (spec demand) */
if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
switch_to_legacy = 1;
scale_index = rs_ht_to_legacy[scale_index];
if (lq_sta->band == IEEE80211_BAND_5GHZ)
tbl->lq_type = LQ_A;
else
tbl->lq_type = LQ_G;
if ((tbl->antenna_type == ANT_BOTH) ||
(tbl->antenna_type == ANT_NONE))
tbl->antenna_type = ANT_MAIN;
tbl->is_fat = 0;
tbl->is_SGI = 0;
}
rs_get_supported_rates(lq_sta, NULL, tbl->lq_type, &rate_mask);
/* Mask with station rate restriction */
if (is_legacy(tbl->lq_type)) {
/* supp_rates has no CCK bits in A mode */
if (lq_sta->band == IEEE80211_BAND_5GHZ)
rate_mask = (u16)(rate_mask &
(lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
else
rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
}
/* If we switched from HT to legacy, check current rate */
if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
return;
}
high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
low = high_low & 0xff;
if (low != IWL_RATE_INVALID)
rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
else
rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
}
/*
* mac80211 sends us Tx status
*/
static void rs_tx_status(void *priv_rate, struct net_device *dev,
struct sk_buff *skb,
struct ieee80211_tx_status *tx_resp)
{
int status;
u8 retries;
int rs_index, index = 0;
struct iwl4965_lq_sta *lq_sta;
struct iwl_link_quality_cmd *table;
struct sta_info *sta;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hw *hw = local_to_hw(local);
struct iwl4965_rate_scale_data *window = NULL;
struct iwl4965_rate_scale_data *search_win = NULL;
struct iwl4965_rate tx_mcs;
struct iwl4965_scale_tbl_info tbl_type;
struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
u8 active_index = 0;
u16 fc = le16_to_cpu(hdr->frame_control);
s32 tpt = 0;
IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
return;
/* This packet was aggregated but doesn't carry rate scale info */
if ((tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) &&
!(tx_resp->flags & IEEE80211_TX_STATUS_AMPDU))
return;
retries = tx_resp->retry_count;
if (retries > 15)
retries = 15;
rcu_read_lock();
sta = sta_info_get(local, hdr->addr1);
if (!sta || !sta->rate_ctrl_priv)
goto out;
lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
if (!priv->lq_mngr.lq_ready)
goto out;
if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
!lq_sta->ibss_sta_added)
goto out;
table = &lq_sta->lq;
active_index = lq_sta->active_tbl;
/* Get mac80211 antenna info */
lq_sta->antenna =
(lq_sta->valid_antenna & local->hw.conf.antenna_sel_tx);
if (!lq_sta->antenna)
lq_sta->antenna = lq_sta->valid_antenna;
/* Ignore mac80211 antenna info for now */
lq_sta->antenna = lq_sta->valid_antenna;
curr_tbl = &(lq_sta->lq_info[active_index]);
search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
window = (struct iwl4965_rate_scale_data *)
&(curr_tbl->win[0]);
search_win = (struct iwl4965_rate_scale_data *)
&(search_tbl->win[0]);
/*
* Ignore this Tx frame response if its initial rate doesn't match
* that of latest Link Quality command. There may be stragglers
* from a previous Link Quality command, but we're no longer interested
* in those; they're either from the "active" mode while we're trying
* to check "search" mode, or a prior "search" mode after we've moved
* to a new "search" mode (which might become the new "active" mode).
*/
tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[0].rate_n_flags);
rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
if (priv->band == IEEE80211_BAND_5GHZ)
rs_index -= IWL_FIRST_OFDM_RATE;
if ((tx_resp->control.tx_rate == NULL) ||
(tbl_type.is_SGI ^
!!(tx_resp->control.flags & IEEE80211_TXCTL_SHORT_GI)) ||
(tbl_type.is_fat ^
!!(tx_resp->control.flags & IEEE80211_TXCTL_40_MHZ_WIDTH)) ||
(tbl_type.is_dup ^
!!(tx_resp->control.flags & IEEE80211_TXCTL_DUP_DATA)) ||
(tbl_type.antenna_type ^
tx_resp->control.antenna_sel_tx) ||
(!!(tx_mcs.rate_n_flags & RATE_MCS_HT_MSK) ^
!!(tx_resp->control.flags & IEEE80211_TXCTL_OFDM_HT)) ||
(!!(tx_mcs.rate_n_flags & RATE_MCS_GF_MSK) ^
!!(tx_resp->control.flags & IEEE80211_TXCTL_GREEN_FIELD)) ||
(hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
tx_resp->control.tx_rate->bitrate)) {
IWL_DEBUG_RATE("initial rate does not match 0x%x\n",
tx_mcs.rate_n_flags);
goto out;
}
/* Update frame history window with "failure" for each Tx retry. */
while (retries) {
/* Look up the rate and other info used for each tx attempt.
* Each tx attempt steps one entry deeper in the rate table. */
tx_mcs.rate_n_flags =
le32_to_cpu(table->rs_table[index].rate_n_flags);
rs_get_tbl_info_from_mcs(&tx_mcs, priv->band,
&tbl_type, &rs_index);
/* If type matches "search" table,
* add failure to "search" history */
if ((tbl_type.lq_type == search_tbl->lq_type) &&
(tbl_type.antenna_type == search_tbl->antenna_type) &&
(tbl_type.is_SGI == search_tbl->is_SGI)) {
if (search_tbl->expected_tpt)
tpt = search_tbl->expected_tpt[rs_index];
else
tpt = 0;
rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
/* Else if type matches "current/active" table,
* add failure to "current/active" history */
} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
(tbl_type.antenna_type == curr_tbl->antenna_type) &&
(tbl_type.is_SGI == curr_tbl->is_SGI)) {
if (curr_tbl->expected_tpt)
tpt = curr_tbl->expected_tpt[rs_index];
else
tpt = 0;
rs_collect_tx_data(window, rs_index, tpt, 1, 0);
}
/* If not searching for a new mode, increment failed counter
* ... this helps determine when to start searching again */
if (lq_sta->stay_in_tbl)
lq_sta->total_failed++;
--retries;
index++;
}
/*
* Find (by rate) the history window to update with final Tx attempt;
* if Tx was successful first try, use original rate,
* else look up the rate that was, finally, successful.
*/
tx_mcs.rate_n_flags = le32_to_cpu(table->rs_table[index].rate_n_flags);
rs_get_tbl_info_from_mcs(&tx_mcs, priv->band, &tbl_type, &rs_index);
/* Update frame history window with "success" if Tx got ACKed ... */
if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
status = 1;
else
status = 0;
/* If type matches "search" table,
* add final tx status to "search" history */
if ((tbl_type.lq_type == search_tbl->lq_type) &&
(tbl_type.antenna_type == search_tbl->antenna_type) &&
(tbl_type.is_SGI == search_tbl->is_SGI)) {
if (search_tbl->expected_tpt)
tpt = search_tbl->expected_tpt[rs_index];
else
tpt = 0;
if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
rs_collect_tx_data(search_win, rs_index, tpt,
tx_resp->ampdu_ack_len,
tx_resp->ampdu_ack_map);
else
rs_collect_tx_data(search_win, rs_index, tpt,
1, status);
/* Else if type matches "current/active" table,
* add final tx status to "current/active" history */
} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
(tbl_type.antenna_type == curr_tbl->antenna_type) &&
(tbl_type.is_SGI == curr_tbl->is_SGI)) {
if (curr_tbl->expected_tpt)
tpt = curr_tbl->expected_tpt[rs_index];
else
tpt = 0;
if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU)
rs_collect_tx_data(window, rs_index, tpt,
tx_resp->ampdu_ack_len,
tx_resp->ampdu_ack_map);
else
rs_collect_tx_data(window, rs_index, tpt,
1, status);
}
/* If not searching for new mode, increment success/failed counter
* ... these help determine when to start searching again */
if (lq_sta->stay_in_tbl) {
if (tx_resp->control.flags & IEEE80211_TXCTL_AMPDU) {
lq_sta->total_success += tx_resp->ampdu_ack_map;
lq_sta->total_failed +=
(tx_resp->ampdu_ack_len - tx_resp->ampdu_ack_map);
} else {
if (status)
lq_sta->total_success++;
else
lq_sta->total_failed++;
}
}
/* See if there's a better rate or modulation mode to try. */
rs_rate_scale_perform(priv, dev, hdr, sta);
out:
rcu_read_unlock();
return;
}
static u8 rs_is_ant_connected(u8 valid_antenna,
enum iwl4965_antenna_type antenna_type)
{
if (antenna_type == ANT_AUX)
return ((valid_antenna & 0x2) ? 1:0);
else if (antenna_type == ANT_MAIN)
return ((valid_antenna & 0x1) ? 1:0);
else if (antenna_type == ANT_BOTH)
return ((valid_antenna & 0x3) == 0x3);
return 1;
}
static u8 rs_is_other_ant_connected(u8 valid_antenna,
enum iwl4965_antenna_type antenna_type)
{
if (antenna_type == ANT_AUX)
return rs_is_ant_connected(valid_antenna, ANT_MAIN);
else
return rs_is_ant_connected(valid_antenna, ANT_AUX);
return 0;
}
/*
* Begin a period of staying with a selected modulation mode.
* Set "stay_in_tbl" flag to prevent any mode switches.
* Set frame tx success limits according to legacy vs. high-throughput,
* and reset overall (spanning all rates) tx success history statistics.
* These control how long we stay using same modulation mode before
* searching for a new mode.
*/
static void rs_set_stay_in_table(u8 is_legacy,
struct iwl4965_lq_sta *lq_sta)
{
IWL_DEBUG_HT("we are staying in the same table\n");
lq_sta->stay_in_tbl = 1; /* only place this gets set */
if (is_legacy) {
lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
} else {
lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
}
lq_sta->table_count = 0;
lq_sta->total_failed = 0;
lq_sta->total_success = 0;
}
/*
* Find correct throughput table for given mode of modulation
*/
static void rs_get_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
struct iwl4965_scale_tbl_info *tbl)
{
if (is_legacy(tbl->lq_type)) {
if (!is_a_band(tbl->lq_type))
tbl->expected_tpt = expected_tpt_G;
else
tbl->expected_tpt = expected_tpt_A;
} else if (is_siso(tbl->lq_type)) {
if (tbl->is_fat && !lq_sta->is_dup)
if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_siso40MHzSGI;
else
tbl->expected_tpt = expected_tpt_siso40MHz;
else if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_siso20MHzSGI;
else
tbl->expected_tpt = expected_tpt_siso20MHz;
} else if (is_mimo(tbl->lq_type)) {
if (tbl->is_fat && !lq_sta->is_dup)
if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo40MHz;
else if (tbl->is_SGI)
tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
else
tbl->expected_tpt = expected_tpt_mimo20MHz;
} else
tbl->expected_tpt = expected_tpt_G;
}
#ifdef CONFIG_IWL4965_HT
/*
* Find starting rate for new "search" high-throughput mode of modulation.
* Goal is to find lowest expected rate (under perfect conditions) that is
* above the current measured throughput of "active" mode, to give new mode
* a fair chance to prove itself without too many challenges.
*
* This gets called when transitioning to more aggressive modulation
* (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
* (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
* to decrease to match "active" throughput. When moving from MIMO to SISO,
* bit rate will typically need to increase, but not if performance was bad.
*/
static s32 rs_get_best_rate(struct iwl_priv *priv,
struct iwl4965_lq_sta *lq_sta,
struct iwl4965_scale_tbl_info *tbl, /* "search" */
u16 rate_mask, s8 index, s8 rate)
{
/* "active" values */
struct iwl4965_scale_tbl_info *active_tbl =
&(lq_sta->lq_info[lq_sta->active_tbl]);
s32 active_sr = active_tbl->win[index].success_ratio;
s32 active_tpt = active_tbl->expected_tpt[index];
/* expected "search" throughput */
s32 *tpt_tbl = tbl->expected_tpt;
s32 new_rate, high, low, start_hi;
u16 high_low;
new_rate = high = low = start_hi = IWL_RATE_INVALID;
for (; ;) {
high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
low = high_low & 0xff;
high = (high_low >> 8) & 0xff;
/*
* Lower the "search" bit rate, to give new "search" mode
* approximately the same throughput as "active" if:
*
* 1) "Active" mode has been working modestly well (but not
* great), and expected "search" throughput (under perfect
* conditions) at candidate rate is above the actual
* measured "active" throughput (but less than expected
* "active" throughput under perfect conditions).
* OR
* 2) "Active" mode has been working perfectly or very well
* and expected "search" throughput (under perfect
* conditions) at candidate rate is above expected
* "active" throughput (under perfect conditions).
*/
if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
((active_sr > IWL_RATE_DECREASE_TH) &&
(active_sr <= IWL_RATE_HIGH_TH) &&
(tpt_tbl[rate] <= active_tpt))) ||
((active_sr >= IWL_RATE_SCALE_SWITCH) &&
(tpt_tbl[rate] > active_tpt))) {
/* (2nd or later pass)
* If we've already tried to raise the rate, and are
* now trying to lower it, use the higher rate. */
if (start_hi != IWL_RATE_INVALID) {
new_rate = start_hi;
break;
}
new_rate = rate;
/* Loop again with lower rate */
if (low != IWL_RATE_INVALID)
rate = low;
/* Lower rate not available, use the original */
else
break;
/* Else try to raise the "search" rate to match "active" */
} else {
/* (2nd or later pass)
* If we've already tried to lower the rate, and are
* now trying to raise it, use the lower rate. */
if (new_rate != IWL_RATE_INVALID)
break;
/* Loop again with higher rate */
else if (high != IWL_RATE_INVALID) {
start_hi = high;
rate = high;
/* Higher rate not available, use the original */
} else {
new_rate = rate;
break;
}
}
}
return new_rate;
}
#endif /* CONFIG_IWL4965_HT */
static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
{
return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
}
/*
* Set up search table for MIMO
*/
static int rs_switch_to_mimo(struct iwl_priv *priv,
struct iwl4965_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct sta_info *sta,
struct iwl4965_scale_tbl_info *tbl, int index)
{
#ifdef CONFIG_IWL4965_HT
u16 rate_mask;
s32 rate;
s8 is_green = lq_sta->is_green;
if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
!sta->ht_info.ht_supported)
return -1;
IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
tbl->lq_type = LQ_MIMO;
rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
&rate_mask);
if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
return -1;
/* Need both Tx chains/antennas to support MIMO */
if (!rs_is_both_ant_supp(lq_sta->antenna))
return -1;
tbl->is_dup = lq_sta->is_dup;
tbl->action = 0;
if (priv->current_ht_config.supported_chan_width
== IWL_CHANNEL_WIDTH_40MHZ)
tbl->is_fat = 1;
else
tbl->is_fat = 0;
if (tbl->is_fat) {
if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
tbl->is_SGI = 1;
else
tbl->is_SGI = 0;
} else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
tbl->is_SGI = 1;
else
tbl->is_SGI = 0;
rs_get_expected_tpt_table(lq_sta, tbl);
rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
return -1;
rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
tbl->current_rate.rate_n_flags, is_green);
return 0;
#else
return -1;
#endif /*CONFIG_IWL4965_HT */
}
/*
* Set up search table for SISO
*/
static int rs_switch_to_siso(struct iwl_priv *priv,
struct iwl4965_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct sta_info *sta,
struct iwl4965_scale_tbl_info *tbl, int index)
{
#ifdef CONFIG_IWL4965_HT
u16 rate_mask;
u8 is_green = lq_sta->is_green;
s32 rate;
IWL_DEBUG_HT("LQ: try to switch to SISO\n");
if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
!sta->ht_info.ht_supported)
return -1;
tbl->is_dup = lq_sta->is_dup;
tbl->lq_type = LQ_SISO;
tbl->action = 0;
rs_get_supported_rates(lq_sta, NULL, tbl->lq_type,
&rate_mask);
if (priv->current_ht_config.supported_chan_width
== IWL_CHANNEL_WIDTH_40MHZ)
tbl->is_fat = 1;
else
tbl->is_fat = 0;
if (tbl->is_fat) {
if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
tbl->is_SGI = 1;
else
tbl->is_SGI = 0;
} else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
tbl->is_SGI = 1;
else
tbl->is_SGI = 0;
if (is_green)
tbl->is_SGI = 0;
rs_get_expected_tpt_table(lq_sta, tbl);
rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index, index);
IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
rate, rate_mask);
return -1;
}
rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
tbl->current_rate.rate_n_flags, is_green);
return 0;
#else
return -1;
#endif /*CONFIG_IWL4965_HT */
}
/*
* Try to switch to new modulation mode from legacy
*/
static int rs_move_legacy_other(struct iwl_priv *priv,
struct iwl4965_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct sta_info *sta,
int index)
{
int ret = 0;
struct iwl4965_scale_tbl_info *tbl =
&(lq_sta->lq_info[lq_sta->active_tbl]);
struct iwl4965_scale_tbl_info *search_tbl =
&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
(sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action = tbl->action;
for (; ;) {
switch (tbl->action) {
case IWL_LEGACY_SWITCH_ANTENNA:
IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
search_tbl->lq_type = LQ_NONE;
lq_sta->action_counter++;
/* Don't change antenna if success has been great */
if (window->success_ratio >= IWL_RS_GOOD_RATIO)
break;
/* Don't change antenna if other one is not connected */
if (!rs_is_other_ant_connected(lq_sta->antenna,
tbl->antenna_type))
break;
/* Set up search table to try other antenna */
memcpy(search_tbl, tbl, sz);
rs_toggle_antenna(&(search_tbl->current_rate),
search_tbl);
rs_get_expected_tpt_table(lq_sta, search_tbl);
lq_sta->search_better_tbl = 1;
goto out;
case IWL_LEGACY_SWITCH_SISO:
IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
/* Set up search table to try SISO */
memcpy(search_tbl, tbl, sz);
search_tbl->lq_type = LQ_SISO;
search_tbl->is_SGI = 0;
search_tbl->is_fat = 0;
ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret) {
lq_sta->search_better_tbl = 1;
lq_sta->action_counter = 0;
goto out;
}
break;
case IWL_LEGACY_SWITCH_MIMO:
IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
/* Set up search table to try MIMO */
memcpy(search_tbl, tbl, sz);
search_tbl->lq_type = LQ_MIMO;
search_tbl->is_SGI = 0;
search_tbl->is_fat = 0;
search_tbl->antenna_type = ANT_BOTH;
ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret) {
lq_sta->search_better_tbl = 1;
lq_sta->action_counter = 0;
goto out;
}
break;
}
tbl->action++;
if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
if (tbl->action == start_action)
break;
}
return 0;
out:
tbl->action++;
if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
return 0;
}
/*
* Try to switch to new modulation mode from SISO
*/
static int rs_move_siso_to_other(struct iwl_priv *priv,
struct iwl4965_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct sta_info *sta,
int index)
{
int ret;
u8 is_green = lq_sta->is_green;
struct iwl4965_scale_tbl_info *tbl =
&(lq_sta->lq_info[lq_sta->active_tbl]);
struct iwl4965_scale_tbl_info *search_tbl =
&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
(sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action = tbl->action;
for (;;) {
lq_sta->action_counter++;
switch (tbl->action) {
case IWL_SISO_SWITCH_ANTENNA:
IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
search_tbl->lq_type = LQ_NONE;
if (window->success_ratio >= IWL_RS_GOOD_RATIO)
break;
if (!rs_is_other_ant_connected(lq_sta->antenna,
tbl->antenna_type))
break;
memcpy(search_tbl, tbl, sz);
search_tbl->action = IWL_SISO_SWITCH_MIMO;
rs_toggle_antenna(&(search_tbl->current_rate),
search_tbl);
lq_sta->search_better_tbl = 1;
goto out;
case IWL_SISO_SWITCH_MIMO:
IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
memcpy(search_tbl, tbl, sz);
search_tbl->lq_type = LQ_MIMO;
search_tbl->is_SGI = 0;
search_tbl->is_fat = 0;
search_tbl->antenna_type = ANT_BOTH;
ret = rs_switch_to_mimo(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret) {
lq_sta->search_better_tbl = 1;
goto out;
}
break;
case IWL_SISO_SWITCH_GI:
IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
memcpy(search_tbl, tbl, sz);
search_tbl->action = 0;
if (search_tbl->is_SGI)
search_tbl->is_SGI = 0;
else if (!is_green)
search_tbl->is_SGI = 1;
else
break;
lq_sta->search_better_tbl = 1;
if ((tbl->lq_type == LQ_SISO) &&
(tbl->is_SGI)) {
s32 tpt = lq_sta->last_tpt / 100;
if (((!tbl->is_fat) &&
(tpt >= expected_tpt_siso20MHz[index])) ||
((tbl->is_fat) &&
(tpt >= expected_tpt_siso40MHz[index])))
lq_sta->search_better_tbl = 0;
}
rs_get_expected_tpt_table(lq_sta, search_tbl);
rs_mcs_from_tbl(&search_tbl->current_rate,
search_tbl, index, is_green);
goto out;
}
tbl->action++;
if (tbl->action > IWL_SISO_SWITCH_GI)
tbl->action = IWL_SISO_SWITCH_ANTENNA;
if (tbl->action == start_action)
break;
}
return 0;
out:
tbl->action++;
if (tbl->action > IWL_SISO_SWITCH_GI)
tbl->action = IWL_SISO_SWITCH_ANTENNA;
return 0;
}
/*
* Try to switch to new modulation mode from MIMO
*/
static int rs_move_mimo_to_other(struct iwl_priv *priv,
struct iwl4965_lq_sta *lq_sta,
struct ieee80211_conf *conf,
struct sta_info *sta,
int index)
{
int ret;
s8 is_green = lq_sta->is_green;
struct iwl4965_scale_tbl_info *tbl =
&(lq_sta->lq_info[lq_sta->active_tbl]);
struct iwl4965_scale_tbl_info *search_tbl =
&(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
(sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
u8 start_action = tbl->action;
for (;;) {
lq_sta->action_counter++;
switch (tbl->action) {
case IWL_MIMO_SWITCH_ANTENNA_A:
case IWL_MIMO_SWITCH_ANTENNA_B:
IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
/* Set up new search table for SISO */
memcpy(search_tbl, tbl, sz);
search_tbl->lq_type = LQ_SISO;
search_tbl->is_SGI = 0;
search_tbl->is_fat = 0;
if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
search_tbl->antenna_type = ANT_MAIN;
else
search_tbl->antenna_type = ANT_AUX;
ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
search_tbl, index);
if (!ret) {
lq_sta->search_better_tbl = 1;
goto out;
}
break;
case IWL_MIMO_SWITCH_GI:
IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
/* Set up new search table for MIMO */
memcpy(search_tbl, tbl, sz);
search_tbl->lq_type = LQ_MIMO;
search_tbl->antenna_type = ANT_BOTH;
search_tbl->action = 0;
if (search_tbl->is_SGI)
search_tbl->is_SGI = 0;
else
search_tbl->is_SGI = 1;
lq_sta->search_better_tbl = 1;
/*
* If active table already uses the fastest possible
* modulation (dual stream with short guard interval),
* and it's working well, there's no need to look
* for a better type of modulation!
*/
if ((tbl->lq_type == LQ_MIMO) &&
(tbl->is_SGI)) {
s32 tpt = lq_sta->last_tpt / 100;
if (((!tbl->is_fat) &&
(tpt >= expected_tpt_mimo20MHz[index])) ||
((tbl->is_fat) &&
(tpt >= expected_tpt_mimo40MHz[index])))
lq_sta->search_better_tbl = 0;
}
rs_get_expected_tpt_table(lq_sta, search_tbl);
rs_mcs_from_tbl(&search_tbl->current_rate,
search_tbl, index, is_green);
goto out;
}
tbl->action++;
if (tbl->action > IWL_MIMO_SWITCH_GI)
tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
if (tbl->action == start_action)
break;
}
return 0;
out:
tbl->action++;
if (tbl->action > IWL_MIMO_SWITCH_GI)
tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
return 0;
}
/*
* Check whether we should continue using same modulation mode, or
* begin search for a new mode, based on:
* 1) # tx successes or failures while using this mode
* 2) # times calling this function
* 3) elapsed time in this mode (not used, for now)
*/
static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
{
struct iwl4965_scale_tbl_info *tbl;
int i;
int active_tbl;
int flush_interval_passed = 0;
active_tbl = lq_sta->active_tbl;
tbl = &(lq_sta->lq_info[active_tbl]);
/* If we've been disallowing search, see if we should now allow it */
if (lq_sta->stay_in_tbl) {
/* Elapsed time using current modulation mode */
if (lq_sta->flush_timer)
flush_interval_passed =
time_after(jiffies,
(unsigned long)(lq_sta->flush_timer +
IWL_RATE_SCALE_FLUSH_INTVL));
/* For now, disable the elapsed time criterion */
flush_interval_passed = 0;
/*
* Check if we should allow search for new modulation mode.
* If many frames have failed or succeeded, or we've used
* this same modulation for a long time, allow search, and
* reset history stats that keep track of whether we should
* allow a new search. Also (below) reset all bitmaps and
* stats in active history.
*/
if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
(lq_sta->total_success > lq_sta->max_success_limit) ||
((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
&& (flush_interval_passed))) {
IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
lq_sta->total_failed,
lq_sta->total_success,
flush_interval_passed);
/* Allow search for new mode */
lq_sta->stay_in_tbl = 0; /* only place reset */
lq_sta->total_failed = 0;
lq_sta->total_success = 0;
lq_sta->flush_timer = 0;
/*
* Else if we've used this modulation mode enough repetitions
* (regardless of elapsed time or success/failure), reset
* history bitmaps and rate-specific stats for all rates in
* active table.
*/
} else {
lq_sta->table_count++;
if (lq_sta->table_count >=
lq_sta->table_count_limit) {
lq_sta->table_count = 0;
IWL_DEBUG_HT("LQ: stay in table clear win\n");
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(
&(tbl->win[i]));
}
}
/* If transitioning to allow "search", reset all history
* bitmaps and stats in active table (this will become the new
* "search" table). */
if (!lq_sta->stay_in_tbl) {
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(tbl->win[i]));
}
}
}
/*
* Do rate scaling and search for new modulation mode.
*/
static void rs_rate_scale_perform(struct iwl_priv *priv,
struct net_device *dev,
struct ieee80211_hdr *hdr,
struct sta_info *sta)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hw *hw = local_to_hw(local);
struct ieee80211_conf *conf = &hw->conf;
int low = IWL_RATE_INVALID;
int high = IWL_RATE_INVALID;
int index;
int i;
struct iwl4965_rate_scale_data *window = NULL;
int current_tpt = IWL_INVALID_VALUE;
int low_tpt = IWL_INVALID_VALUE;
int high_tpt = IWL_INVALID_VALUE;
u32 fail_count;
s8 scale_action = 0;
u16 fc, rate_mask;
u8 update_lq = 0;
struct iwl4965_lq_sta *lq_sta;
struct iwl4965_scale_tbl_info *tbl, *tbl1;
u16 rate_scale_index_msk = 0;
struct iwl4965_rate mcs_rate;
u8 is_green = 0;
u8 active_tbl = 0;
u8 done_search = 0;
u16 high_low;
#ifdef CONFIG_IWL4965_HT
u8 tid = MAX_TID_COUNT;
__le16 *qc;
#endif
IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
fc = le16_to_cpu(hdr->frame_control);
if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
/* Send management frames and broadcast/multicast data using
* lowest rate. */
/* TODO: this could probably be improved.. */
return;
}
if (!sta || !sta->rate_ctrl_priv)
return;
if (!priv->lq_mngr.lq_ready) {
IWL_DEBUG_RATE("still rate scaling not ready\n");
return;
}
lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
#ifdef CONFIG_IWL4965_HT
qc = ieee80211_get_qos_ctrl(hdr);
if (qc) {
tid = (u8)(le16_to_cpu(*qc) & 0xf);
rs_tl_add_packet(lq_sta, tid);
}
#endif
/*
* Select rate-scale / modulation-mode table to work with in
* the rest of this function: "search" if searching for better
* modulation mode, or "active" if doing rate scaling within a mode.
*/
if (!lq_sta->search_better_tbl)
active_tbl = lq_sta->active_tbl;
else
active_tbl = 1 - lq_sta->active_tbl;
tbl = &(lq_sta->lq_info[active_tbl]);
is_green = lq_sta->is_green;
/* current tx rate */
index = sta->last_txrate_idx;
IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
tbl->lq_type);
/* rates available for this association, and for modulation mode */
rs_get_supported_rates(lq_sta, hdr, tbl->lq_type,
&rate_mask);
IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
/* mask with station rate restriction */
if (is_legacy(tbl->lq_type)) {
if (lq_sta->band == IEEE80211_BAND_5GHZ)
/* supp_rates has no CCK bits in A mode */
rate_scale_index_msk = (u16) (rate_mask &
(lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
else
rate_scale_index_msk = (u16) (rate_mask &
lq_sta->supp_rates);
} else
rate_scale_index_msk = rate_mask;
if (!rate_scale_index_msk)
rate_scale_index_msk = rate_mask;
/* If current rate is no longer supported on current association,
* or user changed preferences for rates, find a new supported rate. */
if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
index = IWL_INVALID_VALUE;
update_lq = 1;
/* get the highest available rate */
for (i = 0; i <= IWL_RATE_COUNT; i++) {
if ((1 << i) & rate_scale_index_msk)
index = i;
}
if (index == IWL_INVALID_VALUE) {
IWL_WARNING("Can not find a suitable rate\n");
return;
}
}
/* Get expected throughput table and history window for current rate */
if (!tbl->expected_tpt)
rs_get_expected_tpt_table(lq_sta, tbl);
window = &(tbl->win[index]);
/*
* If there is not enough history to calculate actual average
* throughput, keep analyzing results of more tx frames, without
* changing rate or mode (bypass most of the rest of this function).
* Set up new rate table in uCode only if old rate is not supported
* in current association (use new rate found above).
*/
fail_count = window->counter - window->success_counter;
if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
(window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
|| (tbl->expected_tpt == NULL)) {
IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
"for index %d\n",
window->success_counter, window->counter, index);
/* Can't calculate this yet; not enough history */
window->average_tpt = IWL_INVALID_VALUE;
/* Should we stay with this modulation mode,
* or search for a new one? */
rs_stay_in_table(lq_sta);
/* Set up new rate table in uCode, if needed */
if (update_lq) {
rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
}
goto out;
/* Else we have enough samples; calculate estimate of
* actual average throughput */
} else
window->average_tpt = ((window->success_ratio *
tbl->expected_tpt[index] + 64) / 128);
/* If we are searching for better modulation mode, check success. */
if (lq_sta->search_better_tbl) {
int success_limit = IWL_RATE_SCALE_SWITCH;
/* If good success, continue using the "search" mode;
* no need to send new link quality command, since we're
* continuing to use the setup that we've been trying. */
if ((window->success_ratio > success_limit) ||
(window->average_tpt > lq_sta->last_tpt)) {
if (!is_legacy(tbl->lq_type)) {
IWL_DEBUG_HT("LQ: we are switching to HT"
" rate suc %d current tpt %d"
" old tpt %d\n",
window->success_ratio,
window->average_tpt,
lq_sta->last_tpt);
lq_sta->enable_counter = 1;
}
/* Swap tables; "search" becomes "active" */
lq_sta->active_tbl = active_tbl;
current_tpt = window->average_tpt;
/* Else poor success; go back to mode in "active" table */
} else {
/* Nullify "search" table */
tbl->lq_type = LQ_NONE;
/* Revert to "active" table */
active_tbl = lq_sta->active_tbl;
tbl = &(lq_sta->lq_info[active_tbl]);
/* Revert to "active" rate and throughput info */
index = iwl4965_hwrate_to_plcp_idx(
tbl->current_rate.rate_n_flags);
current_tpt = lq_sta->last_tpt;
/* Need to set up a new rate table in uCode */
update_lq = 1;
IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
}
/* Either way, we've made a decision; modulation mode
* search is done, allow rate adjustment next time. */
lq_sta->search_better_tbl = 0;
done_search = 1; /* Don't switch modes below! */
goto lq_update;
}
/* (Else) not in search of better modulation mode, try for better
* starting rate, while staying in this mode. */
high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
tbl->lq_type);
low = high_low & 0xff;
high = (high_low >> 8) & 0xff;
/* Collect measured throughputs for current and adjacent rates */
current_tpt = window->average_tpt;
if (low != IWL_RATE_INVALID)
low_tpt = tbl->win[low].average_tpt;
if (high != IWL_RATE_INVALID)
high_tpt = tbl->win[high].average_tpt;
/* Assume rate increase */
scale_action = 1;
/* Too many failures, decrease rate */
if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
(current_tpt == 0)) {
IWL_DEBUG_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 == IWL_INVALID_VALUE) &&
(high_tpt == IWL_INVALID_VALUE))
scale_action = 1;
/* 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 != IWL_INVALID_VALUE) &&
(high_tpt != IWL_INVALID_VALUE) &&
(low_tpt < current_tpt) &&
(high_tpt < current_tpt))
scale_action = 0;
/* At least one adjacent rate's throughput is measured,
* and may have better performance. */
else {
/* Higher adjacent rate's throughput is measured */
if (high_tpt != IWL_INVALID_VALUE) {
/* Higher rate has better throughput */
if (high_tpt > current_tpt)
scale_action = 1;
else {
IWL_DEBUG_RATE
("decrease rate because of high tpt\n");
scale_action = -1;
}
/* Lower adjacent rate's throughput is measured */
} else if (low_tpt != IWL_INVALID_VALUE) {
/* Lower rate has better throughput */
if (low_tpt > current_tpt) {
IWL_DEBUG_RATE
("decrease rate because of low tpt\n");
scale_action = -1;
} else
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) {
if ((low != IWL_RATE_INVALID) &&
((window->success_ratio > IWL_RATE_HIGH_TH) ||
(current_tpt > (100 * tbl->expected_tpt[low]))))
scale_action = 0;
/* Sanity check; asked for increase, but success rate has not been great
* even at old rate, higher rate will be worse. Don't change it. */
} else if ((scale_action == 1) &&
(window->success_ratio < IWL_RATE_INCREASE_TH))
scale_action = 0;
switch (scale_action) {
case -1:
/* Decrease starting rate, update uCode's rate table */
if (low != IWL_RATE_INVALID) {
update_lq = 1;
index = low;
}
break;
case 1:
/* Increase starting rate, update uCode's rate table */
if (high != IWL_RATE_INVALID) {
update_lq = 1;
index = high;
}
break;
case 0:
/* No change */
default:
break;
}
IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
"high %d type %d\n",
index, scale_action, low, high, tbl->lq_type);
lq_update:
/* Replace uCode's rate table for the destination station. */
if (update_lq) {
rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
}
/* Should we stay with this modulation mode, or search for a new one? */
rs_stay_in_table(lq_sta);
/*
* Search for new modulation mode if we're:
* 1) Not changing rates right now
* 2) Not just finishing up a search
* 3) Allowing a new search
*/
if (!update_lq && !done_search && !lq_sta->stay_in_tbl) {
/* Save current throughput to compare with "search" throughput*/
lq_sta->last_tpt = current_tpt;
/* Select a new "search" modulation mode to try.
* If one is found, set up the new "search" table. */
if (is_legacy(tbl->lq_type))
rs_move_legacy_other(priv, lq_sta, conf, sta, index);
else if (is_siso(tbl->lq_type))
rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
else
rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
/* If new "search" mode was selected, set up in uCode table */
if (lq_sta->search_better_tbl) {
/* Access the "search" table, clear its history. */
tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(tbl->win[i]));
/* Use new "search" start rate */
index = iwl4965_hwrate_to_plcp_idx(
tbl->current_rate.rate_n_flags);
IWL_DEBUG_HT("Switch current mcs: %X index: %d\n",
tbl->current_rate.rate_n_flags, index);
rs_fill_link_cmd(lq_sta, &tbl->current_rate,
&lq_sta->lq);
iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
}
/* If the "active" (non-search) mode was legacy,
* and we've tried switching antennas,
* but we haven't been able to try HT modes (not available),
* stay with best antenna legacy modulation for a while
* before next round of mode comparisons. */
tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
if (is_legacy(tbl1->lq_type) &&
#ifdef CONFIG_IWL4965_HT
(!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
#endif
(lq_sta->action_counter >= 1)) {
lq_sta->action_counter = 0;
IWL_DEBUG_HT("LQ: STAY in legacy table\n");
rs_set_stay_in_table(1, lq_sta);
}
/* If we're in an HT mode, and all 3 mode switch actions
* have been tried and compared, stay in this best modulation
* mode for a while before next round of mode comparisons. */
if (lq_sta->enable_counter &&
(lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
#ifdef CONFIG_IWL4965_HT
if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
(lq_sta->tx_agg_tid_en & (1 << tid)) &&
(tid != MAX_TID_COUNT)) {
IWL_DEBUG_HT("try to aggregate tid %d\n", tid);
rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
}
#endif /*CONFIG_IWL4965_HT */
lq_sta->action_counter = 0;
rs_set_stay_in_table(0, lq_sta);
}
/*
* Else, don't search for a new modulation mode.
* Put new timestamp in stay-in-modulation-mode flush timer if:
* 1) Not changing rates right now
* 2) Not just finishing up a search
* 3) flush timer is empty
*/
} else {
if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
lq_sta->flush_timer = jiffies;
}
out:
rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
i = index;
sta->last_txrate_idx = i;
/* sta->txrate_idx is an index to A mode rates which start
* at IWL_FIRST_OFDM_RATE
*/
if (lq_sta->band == IEEE80211_BAND_5GHZ)
sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
else
sta->txrate_idx = i;
return;
}
static void rs_initialize_lq(struct iwl_priv *priv,
struct ieee80211_conf *conf,
struct sta_info *sta)
{
int i;
struct iwl4965_lq_sta *lq_sta;
struct iwl4965_scale_tbl_info *tbl;
u8 active_tbl = 0;
int rate_idx;
u8 use_green = rs_use_green(priv, conf);
struct iwl4965_rate mcs_rate;
if (!sta || !sta->rate_ctrl_priv)
goto out;
lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
i = sta->last_txrate_idx;
if ((lq_sta->lq.sta_id == 0xff) &&
(priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
goto out;
if (!lq_sta->search_better_tbl)
active_tbl = lq_sta->active_tbl;
else
active_tbl = 1 - lq_sta->active_tbl;
tbl = &(lq_sta->lq_info[active_tbl]);
if ((i < 0) || (i >= IWL_RATE_COUNT))
i = 0;
mcs_rate.rate_n_flags = iwl4965_rates[i].plcp ;
mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
tbl->antenna_type = ANT_AUX;
rs_get_tbl_info_from_mcs(&mcs_rate, priv->band, tbl, &rate_idx);
if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
rs_toggle_antenna(&mcs_rate, tbl);
rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
rs_get_expected_tpt_table(lq_sta, tbl);
rs_fill_link_cmd(lq_sta, &mcs_rate, &lq_sta->lq);
iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
out:
return;
}
static void rs_get_rate(void *priv_rate, struct net_device *dev,
struct ieee80211_supported_band *sband,
struct sk_buff *skb,
struct rate_selection *sel)
{
int i;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_conf *conf = &local->hw.conf;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct sta_info *sta;
u16 fc;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
struct iwl4965_lq_sta *lq_sta;
IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
rcu_read_lock();
sta = sta_info_get(local, hdr->addr1);
/* Send management frames and broadcast/multicast data using lowest
* rate. */
fc = le16_to_cpu(hdr->frame_control);
if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
!sta || !sta->rate_ctrl_priv) {
sel->rate = rate_lowest(local, sband, sta);
goto out;
}
lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
i = sta->last_txrate_idx;
if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
!lq_sta->ibss_sta_added) {
u8 sta_id = iwl4965_hw_find_station(priv, hdr->addr1);
DECLARE_MAC_BUF(mac);
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_RATE("LQ: ADD station %s\n",
print_mac(mac, hdr->addr1));
sta_id = iwl4965_add_station_flags(priv, hdr->addr1,
0, CMD_ASYNC, NULL);
}
if ((sta_id != IWL_INVALID_STATION)) {
lq_sta->lq.sta_id = sta_id;
lq_sta->lq.rs_table[0].rate_n_flags = 0;
lq_sta->ibss_sta_added = 1;
rs_initialize_lq(priv, conf, sta);
}
if (!lq_sta->ibss_sta_added)
goto done;
}
done:
if ((i < 0) || (i > IWL_RATE_COUNT)) {
sel->rate = rate_lowest(local, sband, sta);
goto out;
}
sel->rate = &priv->ieee_rates[i];
out:
rcu_read_unlock();
}
static void *rs_alloc_sta(void *priv, gfp_t gfp)
{
struct iwl4965_lq_sta *lq_sta;
int i, j;
IWL_DEBUG_RATE("create station rate scale window\n");
lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
if (lq_sta == NULL)
return NULL;
lq_sta->lq.sta_id = 0xff;
for (j = 0; j < LQ_SIZE; j++)
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
return lq_sta;
}
static void rs_rate_init(void *priv_rate, void *priv_sta,
struct ieee80211_local *local,
struct sta_info *sta)
{
int i, j;
struct ieee80211_conf *conf = &local->hw.conf;
struct ieee80211_supported_band *sband;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
struct iwl4965_lq_sta *lq_sta = priv_sta;
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
lq_sta->flush_timer = 0;
lq_sta->supp_rates = sta->supp_rates[sband->band];
sta->txrate_idx = 3;
for (j = 0; j < LQ_SIZE; j++)
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
IWL_DEBUG_RATE("rate scale global init\n");
/* TODO: what is a good starting rate for STA? About middle? Maybe not
* the lowest or the highest rate.. Could consider using RSSI from
* previous packets? Need to have IEEE 802.1X auth succeed immediately
* after assoc.. */
lq_sta->ibss_sta_added = 0;
if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
u8 sta_id = iwl4965_hw_find_station(priv, sta->addr);
DECLARE_MAC_BUF(mac);
/* for IBSS the call are from tasklet */
IWL_DEBUG_HT("LQ: ADD station %s\n",
print_mac(mac, sta->addr));
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_RATE("LQ: ADD station %s\n",
print_mac(mac, sta->addr));
sta_id = iwl4965_add_station_flags(priv, sta->addr,
0, CMD_ASYNC, NULL);
}
if ((sta_id != IWL_INVALID_STATION)) {
lq_sta->lq.sta_id = sta_id;
lq_sta->lq.rs_table[0].rate_n_flags = 0;
}
/* FIXME: this is w/a remove it later */
priv->assoc_station_added = 1;
}
/* Find highest tx rate supported by hardware and destination station */
for (i = 0; i < sband->n_bitrates; i++)
if (sta->supp_rates[sband->band] & BIT(i))
sta->txrate_idx = i;
sta->last_txrate_idx = sta->txrate_idx;
/* WTF is with this bogus comment? A doesn't have cck rates */
/* For MODE_IEEE80211A, cck rates are at end of rate table */
if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
lq_sta->is_dup = 0;
lq_sta->valid_antenna = priv->valid_antenna;
lq_sta->antenna = priv->antenna;
lq_sta->is_green = rs_use_green(priv, conf);
lq_sta->active_rate = priv->active_rate;
lq_sta->active_rate &= ~(0x1000);
lq_sta->active_rate_basic = priv->active_rate_basic;
lq_sta->band = priv->band;
#ifdef CONFIG_IWL4965_HT
/*
* active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
* supp_rates[] does not; shift to convert format, force 9 MBits off.
*/
lq_sta->active_siso_rate = (priv->current_ht_config.supp_mcs_set[0] << 1);
lq_sta->active_siso_rate |=
(priv->current_ht_config.supp_mcs_set[0] & 0x1);
lq_sta->active_siso_rate &= ~((u16)0x2);
lq_sta->active_siso_rate =
lq_sta->active_siso_rate << IWL_FIRST_OFDM_RATE;
/* Same here */
lq_sta->active_mimo_rate = (priv->current_ht_config.supp_mcs_set[1] << 1);
lq_sta->active_mimo_rate |=
(priv->current_ht_config.supp_mcs_set[1] & 0x1);
lq_sta->active_mimo_rate &= ~((u16)0x2);
lq_sta->active_mimo_rate =
lq_sta->active_mimo_rate << IWL_FIRST_OFDM_RATE;
IWL_DEBUG_HT("SISO RATE 0x%X MIMO RATE 0x%X\n",
lq_sta->active_siso_rate,
lq_sta->active_mimo_rate);
/* as default allow aggregation for all tids */
lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
#endif /*CONFIG_IWL4965_HT*/
#ifdef CONFIG_MAC80211_DEBUGFS
lq_sta->drv = priv;
#endif
if (priv->assoc_station_added)
priv->lq_mngr.lq_ready = 1;
rs_initialize_lq(priv, conf, sta);
}
static void rs_fill_link_cmd(struct iwl4965_lq_sta *lq_sta,
struct iwl4965_rate *tx_mcs,
struct iwl_link_quality_cmd *lq_cmd)
{
int index = 0;
int rate_idx;
int repeat_rate = 0;
u8 ant_toggle_count = 0;
u8 use_ht_possible = 1;
struct iwl4965_rate new_rate;
struct iwl4965_scale_tbl_info tbl_type = { 0 };
/* Override starting rate (index 0) if needed for debug purposes */
rs_dbgfs_set_mcs(lq_sta, tx_mcs, index);
/* Interpret rate_n_flags */
rs_get_tbl_info_from_mcs(tx_mcs, lq_sta->band,
&tbl_type, &rate_idx);
/* How many times should we repeat the initial rate? */
if (is_legacy(tbl_type.lq_type)) {
ant_toggle_count = 1;
repeat_rate = IWL_NUMBER_TRY;
} else
repeat_rate = IWL_HT_NUMBER_TRY;
lq_cmd->general_params.mimo_delimiter =
is_mimo(tbl_type.lq_type) ? 1 : 0;
/* Fill 1st table entry (index 0) */
lq_cmd->rs_table[index].rate_n_flags =
cpu_to_le32(tx_mcs->rate_n_flags);
new_rate.rate_n_flags = tx_mcs->rate_n_flags;
if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
lq_cmd->general_params.single_stream_ant_msk
= LINK_QUAL_ANT_A_MSK;
else
lq_cmd->general_params.single_stream_ant_msk
= LINK_QUAL_ANT_B_MSK;
index++;
repeat_rate--;
/* Fill rest of rate table */
while (index < LINK_QUAL_MAX_RETRY_NUM) {
/* Repeat initial/next rate.
* For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
* For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
if (is_legacy(tbl_type.lq_type)) {
if (ant_toggle_count <
NUM_TRY_BEFORE_ANTENNA_TOGGLE)
ant_toggle_count++;
else {
rs_toggle_antenna(&new_rate, &tbl_type);
ant_toggle_count = 1;
}
}
/* Override next rate if needed for debug purposes */
rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
/* Fill next table entry */
lq_cmd->rs_table[index].rate_n_flags =
cpu_to_le32(new_rate.rate_n_flags);
repeat_rate--;
index++;
}
rs_get_tbl_info_from_mcs(&new_rate, lq_sta->band, &tbl_type,
&rate_idx);
/* Indicate to uCode which entries might be MIMO.
* If initial rate was MIMO, this will finally end up
* as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
if (is_mimo(tbl_type.lq_type))
lq_cmd->general_params.mimo_delimiter = index;
/* Get next rate */
rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
use_ht_possible, &new_rate);
/* How many times should we repeat the next rate? */
if (is_legacy(tbl_type.lq_type)) {
if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
ant_toggle_count++;
else {
rs_toggle_antenna(&new_rate, &tbl_type);
ant_toggle_count = 1;
}
repeat_rate = IWL_NUMBER_TRY;
} else
repeat_rate = IWL_HT_NUMBER_TRY;
/* Don't allow HT rates after next pass.
* rs_get_lower_rate() will change type to LQ_A or LQ_G. */
use_ht_possible = 0;
/* Override next rate if needed for debug purposes */
rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
/* Fill next table entry */
lq_cmd->rs_table[index].rate_n_flags =
cpu_to_le32(new_rate.rate_n_flags);
index++;
repeat_rate--;
}
lq_cmd->general_params.dual_stream_ant_msk = 3;
lq_cmd->agg_params.agg_dis_start_th = 3;
lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
}
static void *rs_alloc(struct ieee80211_local *local)
{
return local->hw.priv;
}
/* rate scale requires free function to be implemented */
static void rs_free(void *priv_rate)
{
return;
}
static void rs_clear(void *priv_rate)
{
struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
IWL_DEBUG_RATE("enter\n");
priv->lq_mngr.lq_ready = 0;
IWL_DEBUG_RATE("leave\n");
}
static void rs_free_sta(void *priv, void *priv_sta)
{
struct iwl4965_lq_sta *lq_sta = priv_sta;
IWL_DEBUG_RATE("enter\n");
kfree(lq_sta);
IWL_DEBUG_RATE("leave\n");
}
#ifdef CONFIG_MAC80211_DEBUGFS
static int open_file_generic(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
struct iwl4965_rate *mcs, int index)
{
u32 base_rate;
if (lq_sta->band == IEEE80211_BAND_5GHZ)
base_rate = 0x800D;
else
base_rate = 0x820A;
if (lq_sta->dbg_fixed.rate_n_flags) {
if (index < 12)
mcs->rate_n_flags = lq_sta->dbg_fixed.rate_n_flags;
else
mcs->rate_n_flags = base_rate;
IWL_DEBUG_RATE("Fixed rate ON\n");
return;
}
IWL_DEBUG_RATE("Fixed rate OFF\n");
}
static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
const char __user *user_buf, size_t count, loff_t *ppos)
{
struct iwl4965_lq_sta *lq_sta = file->private_data;
char buf[64];
int buf_size;
u32 parsed_rate;
memset(buf, 0, sizeof(buf));
buf_size = min(count, sizeof(buf) - 1);
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
if (sscanf(buf, "%x", &parsed_rate) == 1)
lq_sta->dbg_fixed.rate_n_flags = parsed_rate;
else
lq_sta->dbg_fixed.rate_n_flags = 0;
lq_sta->active_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
lq_sta->active_mimo_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
lq_sta->lq.sta_id, lq_sta->dbg_fixed.rate_n_flags);
if (lq_sta->dbg_fixed.rate_n_flags) {
rs_fill_link_cmd(lq_sta, &lq_sta->dbg_fixed, &lq_sta->lq);
iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
}
return count;
}
static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
char __user *user_buf, size_t count, loff_t *ppos)
{
char buff[1024];
int desc = 0;
int i = 0;
struct iwl4965_lq_sta *lq_sta = file->private_data;
desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
lq_sta->total_failed, lq_sta->total_success,
lq_sta->active_rate);
desc += sprintf(buff+desc, "fixed rate 0x%X\n",
lq_sta->dbg_fixed.rate_n_flags);
desc += sprintf(buff+desc, "general:"
"flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
lq_sta->lq.general_params.flags,
lq_sta->lq.general_params.mimo_delimiter,
lq_sta->lq.general_params.single_stream_ant_msk,
lq_sta->lq.general_params.dual_stream_ant_msk);
desc += sprintf(buff+desc, "agg:"
"time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
lq_sta->lq.agg_params.agg_dis_start_th,
lq_sta->lq.agg_params.agg_frame_cnt_limit);
desc += sprintf(buff+desc,
"Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
lq_sta->lq.general_params.start_rate_index[0],
lq_sta->lq.general_params.start_rate_index[1],
lq_sta->lq.general_params.start_rate_index[2],
lq_sta->lq.general_params.start_rate_index[3]);
for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
}
static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
.write = rs_sta_dbgfs_scale_table_write,
.read = rs_sta_dbgfs_scale_table_read,
.open = open_file_generic,
};
static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
char __user *user_buf, size_t count, loff_t *ppos)
{
char buff[1024];
int desc = 0;
int i, j;
struct iwl4965_lq_sta *lq_sta = file->private_data;
for (i = 0; i < LQ_SIZE; i++) {
desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
"rate=0x%X\n",
lq_sta->active_tbl == i?"*":"x",
lq_sta->lq_info[i].lq_type,
lq_sta->lq_info[i].is_SGI,
lq_sta->lq_info[i].is_fat,
lq_sta->lq_info[i].is_dup,
lq_sta->lq_info[i].current_rate.rate_n_flags);
for (j = 0; j < IWL_RATE_COUNT; j++) {
desc += sprintf(buff+desc,
"counter=%d success=%d %%=%d\n",
lq_sta->lq_info[i].win[j].counter,
lq_sta->lq_info[i].win[j].success_counter,
lq_sta->lq_info[i].win[j].success_ratio);
}
}
return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
}
static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
.read = rs_sta_dbgfs_stats_table_read,
.open = open_file_generic,
};
static void rs_add_debugfs(void *priv, void *priv_sta,
struct dentry *dir)
{
struct iwl4965_lq_sta *lq_sta = priv_sta;
lq_sta->rs_sta_dbgfs_scale_table_file =
debugfs_create_file("rate_scale_table", 0600, dir,
lq_sta, &rs_sta_dbgfs_scale_table_ops);
lq_sta->rs_sta_dbgfs_stats_table_file =
debugfs_create_file("rate_stats_table", 0600, dir,
lq_sta, &rs_sta_dbgfs_stats_table_ops);
#ifdef CONFIG_IWL4965_HT
lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
&lq_sta->tx_agg_tid_en);
#endif
}
static void rs_remove_debugfs(void *priv, void *priv_sta)
{
struct iwl4965_lq_sta *lq_sta = priv_sta;
debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
#ifdef CONFIG_IWL4965_HT
debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
#endif
}
#endif
static struct rate_control_ops rs_ops = {
.module = NULL,
.name = RS_NAME,
.tx_status = rs_tx_status,
.get_rate = rs_get_rate,
.rate_init = rs_rate_init,
.clear = rs_clear,
.alloc = rs_alloc,
.free = rs_free,
.alloc_sta = rs_alloc_sta,
.free_sta = rs_free_sta,
#ifdef CONFIG_MAC80211_DEBUGFS
.add_sta_debugfs = rs_add_debugfs,
.remove_sta_debugfs = rs_remove_debugfs,
#endif
};
int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
{
struct ieee80211_local *local = hw_to_local(hw);
struct iwl_priv *priv = hw->priv;
struct iwl4965_lq_sta *lq_sta;
struct sta_info *sta;
int cnt = 0, i;
u32 samples = 0, success = 0, good = 0;
unsigned long now = jiffies;
u32 max_time = 0;
u8 lq_type, antenna;
rcu_read_lock();
sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
if (!sta || !sta->rate_ctrl_priv) {
if (sta)
IWL_DEBUG_RATE("leave - no private rate data!\n");
else
IWL_DEBUG_RATE("leave - no station!\n");
rcu_read_unlock();
return sprintf(buf, "station %d not found\n", sta_id);
}
lq_sta = (void *)sta->rate_ctrl_priv;
lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
antenna = lq_sta->lq_info[lq_sta->active_tbl].antenna_type;
if (is_legacy(lq_type))
i = IWL_RATE_54M_INDEX;
else
i = IWL_RATE_60M_INDEX;
while (1) {
u64 mask;
int j;
int active = lq_sta->active_tbl;
cnt +=
sprintf(&buf[cnt], " %2dMbs: ", iwl4965_rates[i].ieee / 2);
mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
buf[cnt++] =
(lq_sta->lq_info[active].win[i].data & mask)
? '1' : '0';
samples += lq_sta->lq_info[active].win[i].counter;
good += lq_sta->lq_info[active].win[i].success_counter;
success += lq_sta->lq_info[active].win[i].success_counter *
iwl4965_rates[i].ieee;
if (lq_sta->lq_info[active].win[i].stamp) {
int delta =
jiffies_to_msecs(now -
lq_sta->lq_info[active].win[i].stamp);
if (delta > max_time)
max_time = delta;
cnt += sprintf(&buf[cnt], "%5dms\n", delta);
} else
buf[cnt++] = '\n';
j = iwl4965_get_prev_ieee_rate(i);
if (j == i)
break;
i = j;
}
/* Display the average rate of all samples taken.
*
* NOTE: We multiply # of samples by 2 since the IEEE measurement
* added from iwl4965_rates is actually 2X the rate */
if (samples)
cnt += sprintf(&buf[cnt],
"\nAverage rate is %3d.%02dMbs over last %4dms\n"
"%3d%% success (%d good packets over %d tries)\n",
success / (2 * samples), (success * 5 / samples) % 10,
max_time, good * 100 / samples, good, samples);
else
cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
"active_search %d rate index %d\n", lq_type, antenna,
lq_sta->search_better_tbl, sta->last_txrate_idx);
rcu_read_unlock();
return cnt;
}
void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
{
struct iwl_priv *priv = hw->priv;
priv->lq_mngr.lq_ready = 1;
}
int iwl4965_rate_control_register(void)
{
return ieee80211_rate_control_register(&rs_ops);
}
void iwl4965_rate_control_unregister(void)
{
ieee80211_rate_control_unregister(&rs_ops);
}