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Commit 77626355 authored by Ben Cahill's avatar Ben Cahill Committed by David S. Miller
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iwl4965: add comments to rate scaling code 

Add comments to rate scaling code.
Signed-off-by: default avatarBen Cahill <ben.m.cahill@intel.com>
Signed-off-by: default avatarZhu Yi <yi.zhu@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent f58177b9
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Showing with 442 additions and 75 deletions
drivers/net/wireless/iwlwifi/iwl-4965-rs.c
View file @ 77626355
......@@ -47,13 +47,12 @@
#define IWL_NUMBER_TRY 1
#define IWL_HT_NUMBER_TRY 3
#define IWL_RATE_MAX_WINDOW 62
#define IWL_RATE_HIGH_TH 10880
#define IWL_RATE_MIN_FAILURE_TH 6
#define IWL_RATE_MIN_SUCCESS_TH 8
#define IWL_RATE_DECREASE_TH 1920
#define IWL_RATE_INCREASE_TH 8960
#define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ) /*2 seconds */
#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,
......@@ -69,54 +68,74 @@ 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;
s32 success_counter;
s32 success_ratio;
s32 counter;
s32 average_tpt;
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 iwl_rate_scale_priv,
* 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;
u8 is_fat;
u8 is_dup;
u8 action;
s32 *expected_tpt;
struct iwl4965_rate current_rate;
struct iwl4965_rate_scale_data win[IWL_RATE_COUNT];
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 */
};
/**
* struct iwl_rate_scale_priv -- driver's rate scaling private structure
*
* Pointer to this gets passed back and forth between driver and mac80211.
*/
struct iwl4965_rate_scale_priv {
u8 active_tbl;
u8 enable_counter;
u8 stay_in_tbl;
u8 search_better_tbl;
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;
u32 max_success_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;
u32 total_success;
u32 flush_timer;
u8 action_counter;
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;
u8 phymode;
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 iwl4965_link_quality_cmd lq;
struct iwl4965_scale_tbl_info lq_info[LQ_SIZE];
struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
#ifdef CONFIG_MAC80211_DEBUGFS
struct dentry *rs_sta_dbgfs_scale_table_file;
struct dentry *rs_sta_dbgfs_stats_table_file;
......@@ -142,6 +161,12 @@ static void rs_dbgfs_set_mcs(struct iwl4965_rate_scale_priv *rs_priv,
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
};
......@@ -244,6 +269,13 @@ static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
window->stamp = 0;
}
/**
* 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, u32 status)
{
......@@ -255,10 +287,18 @@ static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
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!).
*/
if (window->counter >= win_size) {
window->counter = win_size - 1;
mask = 1;
mask = (mask << (win_size - 1));
......@@ -268,7 +308,11 @@ static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
}
}
/* Increment frames-attempted counter */
window->counter = window->counter + 1;
/* 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 (status != 0) {
......@@ -276,6 +320,7 @@ static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
window->data |= 0x1;
}
/* Calculate current success ratio, avoid divide-by-0! */
if (window->counter > 0)
window->success_ratio = 128 * (100 * window->success_counter)
/ window->counter;
......@@ -284,17 +329,22 @@ static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
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)
......@@ -349,6 +399,10 @@ static void rs_mcs_from_tbl(struct iwl4965_rate *mcs_rate,
}
}
/*
* 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,
int phymode, struct iwl4965_scale_tbl_info *tbl,
int *rate_idx)
......@@ -362,11 +416,12 @@ static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
*rate_idx = -1;
return -EINVAL;
}
tbl->is_SGI = 0;
tbl->is_SGI = 0; /* default legacy setup */
tbl->is_fat = 0;
tbl->is_dup = 0;
tbl->antenna_type = ANT_BOTH;
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);
......@@ -386,6 +441,7 @@ static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
}
*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;
......@@ -410,6 +466,8 @@ static int rs_get_tbl_info_from_mcs(const struct iwl4965_rate *mcs_rate,
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)
......@@ -564,8 +622,9 @@ static void rs_get_lower_rate(struct iwl4965_rate_scale_priv *lq_data,
rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask);
/* mask with station rate restriction */
/* Mask with station rate restriction */
if (is_legacy(tbl->lq_type)) {
/* supp_rates has no CCK bits in A mode */
if (lq_data->phymode == (u8) MODE_IEEE80211A)
rate_mask = (u16)(rate_mask &
(lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
......@@ -573,7 +632,7 @@ static void rs_get_lower_rate(struct iwl4965_rate_scale_priv *lq_data,
rate_mask = (u16)(rate_mask & lq_data->supp_rates);
}
/* if we did switched from HT to legacy check current rate */
/* 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;
......@@ -588,6 +647,9 @@ static void rs_get_lower_rate(struct iwl4965_rate_scale_priv *lq_data,
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,
......@@ -641,11 +703,14 @@ static void rs_tx_status(void *priv_rate,
table = &lq->lq;
active_index = lq->active_tbl;
/* Get mac80211 antenna info */
lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
if (!lq->antenna)
lq->antenna = lq->valid_antenna;
/* Ignore mac80211 antenna info for now */
lq->antenna = lq->valid_antenna;
curr_tbl = &(lq->lq_info[active_index]);
search_tbl = &(lq->lq_info[(1 - active_index)]);
window = (struct iwl4965_rate_scale_data *)
......@@ -664,6 +729,14 @@ static void rs_tx_status(void *priv_rate,
return;
}
/*
* 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).
*/
if (retries &&
(tx_mcs.rate_n_flags !=
le32_to_cpu(table->rs_table[0].rate_n_flags))) {
......@@ -674,12 +747,17 @@ static void rs_tx_status(void *priv_rate,
return;
}
/* 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->phymode,
&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)) {
......@@ -687,8 +765,10 @@ static void rs_tx_status(void *priv_rate,
tpt = search_tbl->expected_tpt[rs_index];
else
tpt = 0;
rs_collect_tx_data(search_win,
rs_index, tpt, 0);
rs_collect_tx_data(search_win, rs_index, tpt, 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)) {
......@@ -698,6 +778,9 @@ static void rs_tx_status(void *priv_rate,
tpt = 0;
rs_collect_tx_data(window, rs_index, tpt, 0);
}
/* If not searching for a new mode, increment failed counter
* ... this helps determine when to start searching again */
if (lq->stay_in_tbl)
lq->total_failed++;
--retries;
......@@ -705,6 +788,11 @@ static void rs_tx_status(void *priv_rate,
}
/*
* 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.
*/
if (!tx_resp->retry_count)
tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
else
......@@ -714,11 +802,14 @@ static void rs_tx_status(void *priv_rate,
rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
&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)) {
......@@ -728,6 +819,9 @@ static void rs_tx_status(void *priv_rate,
tpt = 0;
rs_collect_tx_data(search_win,
rs_index, tpt, 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)) {
......@@ -738,6 +832,8 @@ static void rs_tx_status(void *priv_rate,
rs_collect_tx_data(window, rs_index, tpt, status);
}
/* If not searching for new mode, increment success/failed counter
* ... these help determine when to start searching again */
if (lq->stay_in_tbl) {
if (status)
lq->total_success++;
......@@ -745,6 +841,7 @@ static void rs_tx_status(void *priv_rate,
lq->total_failed++;
}
/* See if there's a better rate or modulation mode to try. */
rs_rate_scale_perform(priv, dev, hdr, sta);
sta_info_put(sta);
return;
......@@ -774,11 +871,19 @@ static u8 rs_is_other_ant_connected(u8 valid_antenna,
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_rate_scale_priv *lq_data)
{
IWL_DEBUG_HT("we are staying in the same table\n");
lq_data->stay_in_tbl = 1;
lq_data->stay_in_tbl = 1; /* only place this gets set */
if (is_legacy) {
lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT;
lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
......@@ -793,6 +898,9 @@ static void rs_set_stay_in_table(u8 is_legacy,
lq_data->total_success = 0;
}
/*
* Find correct throughput table for given mode of modulation
*/
static void rs_get_expected_tpt_table(struct iwl4965_rate_scale_priv *lq_data,
struct iwl4965_scale_tbl_info *tbl)
{
......@@ -827,17 +935,33 @@ static void rs_get_expected_tpt_table(struct iwl4965_rate_scale_priv *lq_data,
}
#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 iwl4965_priv *priv,
struct iwl4965_rate_scale_priv *lq_data,
struct iwl4965_scale_tbl_info *tbl,
struct iwl4965_scale_tbl_info *tbl, /* "search" */
u16 rate_mask, s8 index, s8 rate)
{
/* "active" values */
struct iwl4965_scale_tbl_info *active_tbl =
&(lq_data->lq_info[lq_data->active_tbl]);
s32 new_rate, high, low, start_hi;
s32 active_sr = active_tbl->win[index].success_ratio;
s32 *tpt_tbl = tbl->expected_tpt;
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;
......@@ -848,6 +972,21 @@ static s32 rs_get_best_rate(struct iwl4965_priv *priv,
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_data->last_tpt) &&
((active_sr > IWL_RATE_DECREASE_TH) &&
(active_sr <= IWL_RATE_HIGH_TH) &&
......@@ -855,21 +994,38 @@ static s32 rs_get_best_rate(struct iwl4965_priv *priv,
((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;
......@@ -886,6 +1042,9 @@ 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 iwl4965_priv *priv,
struct iwl4965_rate_scale_priv *lq_data,
struct iwl4965_scale_tbl_info *tbl, int index)
......@@ -906,6 +1065,7 @@ static int rs_switch_to_mimo(struct iwl4965_priv *priv,
if (priv->current_assoc_ht.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_data->antenna))
return -1;
......@@ -943,6 +1103,9 @@ static int rs_switch_to_mimo(struct iwl4965_priv *priv,
#endif /*CONFIG_IWL4965_HT */
}
/*
* Set up search table for SISO
*/
static int rs_switch_to_siso(struct iwl4965_priv *priv,
struct iwl4965_rate_scale_priv *lq_data,
struct iwl4965_scale_tbl_info *tbl, int index)
......@@ -999,6 +1162,9 @@ static int rs_switch_to_siso(struct iwl4965_priv *priv,
#endif /*CONFIG_IWL4965_HT */
}
/*
* Try to switch to new modulation mode from legacy
*/
static int rs_move_legacy_other(struct iwl4965_priv *priv,
struct iwl4965_rate_scale_priv *lq_data,
int index)
......@@ -1020,12 +1186,17 @@ static int rs_move_legacy_other(struct iwl4965_priv *priv,
search_tbl->lq_type = LQ_NONE;
lq_data->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_data->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),
......@@ -1036,6 +1207,8 @@ static int rs_move_legacy_other(struct iwl4965_priv *priv,
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;
......@@ -1051,6 +1224,8 @@ static int rs_move_legacy_other(struct iwl4965_priv *priv,
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;
......@@ -1083,6 +1258,9 @@ static int rs_move_legacy_other(struct iwl4965_priv *priv,
}
/*
* Try to switch to new modulation mode from SISO
*/
static int rs_move_siso_to_other(struct iwl4965_priv *priv,
struct iwl4965_rate_scale_priv *lq_data,
int index)
......@@ -1173,6 +1351,9 @@ static int rs_move_siso_to_other(struct iwl4965_priv *priv,
return 0;
}
/*
* Try to switch to new modulation mode from MIMO
*/
static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
struct iwl4965_rate_scale_priv *lq_data,
int index)
......@@ -1193,6 +1374,8 @@ static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
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;
......@@ -1212,6 +1395,8 @@ static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
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;
......@@ -1221,6 +1406,13 @@ static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
else
search_tbl->is_SGI = 1;
lq_data->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_data->last_tpt / 100;
......@@ -1253,6 +1445,13 @@ static int rs_move_mimo_to_other(struct iwl4965_priv *priv,
}
/*
* 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_rate_scale_priv *lq_data)
{
struct iwl4965_scale_tbl_info *tbl;
......@@ -1264,15 +1463,27 @@ static void rs_stay_in_table(struct iwl4965_rate_scale_priv *lq_data)
tbl = &(lq_data->lq_info[active_tbl]);
/* If we've been disallowing search, see if we should now allow it */
if (lq_data->stay_in_tbl) {
/* Elapsed time using current modulation mode */
if (lq_data->flush_timer)
flush_interval_passed =
time_after(jiffies,
(unsigned long)(lq_data->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_data->total_failed > lq_data->max_failure_limit) ||
(lq_data->total_success > lq_data->max_success_limit) ||
((!lq_data->search_better_tbl) && (lq_data->flush_timer)
......@@ -1281,10 +1492,19 @@ static void rs_stay_in_table(struct iwl4965_rate_scale_priv *lq_data)
lq_data->total_failed,
lq_data->total_success,
flush_interval_passed);
lq_data->stay_in_tbl = 0;
/* Allow search for new mode */
lq_data->stay_in_tbl = 0; /* only place reset */
lq_data->total_failed = 0;
lq_data->total_success = 0;
lq_data->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_data->table_count++;
if (lq_data->table_count >=
......@@ -1298,6 +1518,9 @@ static void rs_stay_in_table(struct iwl4965_rate_scale_priv *lq_data)
}
}
/* If transitioning to allow "search", reset all history
* bitmaps and stats in active table (this will become the new
* "search" table). */
if (!lq_data->stay_in_tbl) {
for (i = 0; i < IWL_RATE_COUNT; i++)
rs_rate_scale_clear_window(&(tbl->win[i]));
......@@ -1305,6 +1528,9 @@ static void rs_stay_in_table(struct iwl4965_rate_scale_priv *lq_data)
}
}
/*
* Do rate scaling and search for new modulation mode.
*/
static void rs_rate_scale_perform(struct iwl4965_priv *priv,
struct net_device *dev,
struct ieee80211_hdr *hdr,
......@@ -1350,6 +1576,11 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
}
lq_data = (struct iwl4965_rate_scale_priv *)sta->rate_ctrl_priv;
/*
* 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_data->search_better_tbl)
active_tbl = lq_data->active_tbl;
else
......@@ -1358,11 +1589,13 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
tbl = &(lq_data->lq_info[active_tbl]);
is_green = lq_data->is_green;
/* current tx rate */
index = sta->last_txrate;
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_data, hdr, tbl->lq_type,
&rate_mask);
......@@ -1371,6 +1604,7 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
/* mask with station rate restriction */
if (is_legacy(tbl->lq_type)) {
if (lq_data->phymode == (u8) MODE_IEEE80211A)
/* supp_rates has no CCK bits in A mode */
rate_scale_index_msk = (u16) (rate_mask &
(lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
else
......@@ -1383,11 +1617,13 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
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 lowest available rate */
/* get the highest available rate */
for (i = 0; i <= IWL_RATE_COUNT; i++) {
if ((1 << i) & rate_scale_index_msk)
index = i;
......@@ -1399,11 +1635,19 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
}
}
/* Get expected throughput table and history window for current rate */
if (!tbl->expected_tpt)
rs_get_expected_tpt_table(lq_data, 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))
......@@ -1411,8 +1655,15 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
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_data);
/* 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_data, &mcs_rate, &lq_data->lq);
......@@ -1420,13 +1671,19 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
}
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_data->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_data->last_tpt)) {
if (!is_legacy(tbl->lq_type)) {
......@@ -1438,55 +1695,78 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
lq_data->last_tpt);
lq_data->enable_counter = 1;
}
/* Swap tables; "search" becomes "active" */
lq_data->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_data->active_tbl;
tbl = &(lq_data->lq_info[active_tbl]);
/* Revert to "active" rate and throughput info */
index = iwl4965_rate_index_from_plcp(
tbl->current_rate.rate_n_flags);
current_tpt = lq_data->last_tpt;
/* Need to set up a new rate table in uCode */
update_lq = 1;
current_tpt = lq_data->last_tpt;
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_data->search_better_tbl = 0;
done_search = 1;
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 {
......@@ -1494,7 +1774,10 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
("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");
......@@ -1504,23 +1787,30 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
}
}
/* 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;
......@@ -1528,6 +1818,7 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
break;
case 0:
/* No change */
default:
break;
}
......@@ -1537,16 +1828,28 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
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_data, &mcs_rate, &lq_data->lq);
rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
}
/* Should we stay with this modulation mode, or search for a new one? */
rs_stay_in_table(lq_data);
/*
* 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_data->stay_in_tbl) {
/* Save current throughput to compare with "search" throughput*/
lq_data->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_data, index);
else if (is_siso(tbl->lq_type))
......@@ -1554,11 +1857,14 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
else
rs_move_mimo_to_other(priv, lq_data, index);
/* If new "search" mode was selected, set up in uCode table */
if (lq_data->search_better_tbl) {
/* Access the "search" table, clear its history. */
tbl = &(lq_data->lq_info[(1 - lq_data->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_rate_index_from_plcp(
tbl->current_rate.rate_n_flags);
......@@ -1568,8 +1874,13 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
&lq_data->lq);
rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
}
tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
/* 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_data->lq_info[lq_data->active_tbl]);
if (is_legacy(tbl1->lq_type) &&
#ifdef CONFIG_IWL4965_HT
!priv->current_assoc_ht.is_ht &&
......@@ -1580,9 +1891,13 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
rs_set_stay_in_table(1, lq_data);
}
/* 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_data->enable_counter &&
(lq_data->action_counter >= IWL_ACTION_LIMIT)) {
#ifdef CONFIG_IWL4965_HT_AGG
/* If appropriate, set up aggregation! */
if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) &&
(priv->lq_mngr.agg_ctrl.auto_agg)) {
priv->lq_mngr.agg_ctrl.tid_retry =
......@@ -1593,6 +1908,14 @@ static void rs_rate_scale_perform(struct iwl4965_priv *priv,
lq_data->action_counter = 0;
rs_set_stay_in_table(0, lq_data);
}
/*
* 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_data->flush_timer))
lq_data->flush_timer = jiffies;
......@@ -1789,15 +2112,14 @@ static void rs_rate_init(void *priv_rate, void *priv_sta,
priv->assoc_station_added = 1;
}
/* Find highest tx rate supported by hardware and destination station */
for (i = 0; i < mode->num_rates; i++) {
if ((sta->supp_rates & BIT(i)) &&
(mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
sta->txrate = i;
}
sta->last_txrate = sta->txrate;
/* For MODE_IEEE80211A mode cck rate are at end
* rate table
*/
/* For MODE_IEEE80211A, cck rates are at end of rate table */
if (local->hw.conf.phymode == MODE_IEEE80211A)
sta->last_txrate += IWL_FIRST_OFDM_RATE;
......@@ -1810,11 +2132,16 @@ static void rs_rate_init(void *priv_rate, void *priv_sta,
crl->active_rate_basic = priv->active_rate_basic;
crl->phymode = priv->phymode;
#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.
*/
crl->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1);
crl->active_siso_rate |= (priv->current_assoc_ht.supp_rates[0] & 0x1);
crl->active_siso_rate &= ~((u16)0x2);
crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE;
/* Same here */
crl->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1);
crl->active_mimo_rate |= (priv->current_assoc_ht.supp_rates[1] & 0x1);
crl->active_mimo_rate &= ~((u16)0x2);
......@@ -1844,11 +2171,14 @@ static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
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_data, tx_mcs, index);
/* Interpret rate_n_flags */
rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
&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;
......@@ -1857,19 +2187,27 @@ static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
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 = 1;
lq_cmd->general_params.single_stream_ant_msk
= LINK_QUAL_ANT_A_MSK;
else
lq_cmd->general_params.single_stream_ant_msk = 2;
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 <
......@@ -1881,7 +2219,10 @@ static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
}
}
/* Override next rate if needed for debug purposes */
rs_dbgfs_set_mcs(lq_data, &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--;
......@@ -1891,12 +2232,17 @@ static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &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_data, &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++;
......@@ -1908,9 +2254,14 @@ static void rs_fill_link_cmd(struct iwl4965_rate_scale_priv *lq_data,
} 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_data, &new_rate, index);
/* Fill next table entry */
lq_cmd->rs_table[index].rate_n_flags =
cpu_to_le32(new_rate.rate_n_flags);
......@@ -2006,9 +2357,9 @@ static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
else
rs_priv->dbg_fixed.rate_n_flags = 0;
rs_priv->active_rate = 0x0FFF;
rs_priv->active_siso_rate = 0x1FD0;
rs_priv->active_mimo_rate = 0x1FD0;
rs_priv->active_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
rs_priv->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
rs_priv->active_mimo_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags);
......@@ -2209,7 +2560,7 @@ int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
/* Display the average rate of all samples taken.
*
* NOTE: We multiple # of samples by 2 since the IEEE measurement
* NOTE: We multiply # of samples by 2 since the IEEE measurement
* added from iwl4965_rates is actually 2X the rate */
if (samples)
count += sprintf(&buf[count],
......
drivers/net/wireless/iwlwifi/iwl-4965-rs.h
View file @ 77626355
......@@ -30,10 +30,10 @@
#include "iwl-4965.h"
struct iwl4965_rate_info {
u8 plcp;
u8 plcp_siso;
u8 plcp_mimo;
u8 ieee;
u8 plcp; /* uCode API: IWL_RATE_6M_PLCP, etc. */
u8 plcp_siso; /* uCode API: IWL_RATE_SISO_6M_PLCP, etc. */
u8 plcp_mimo; /* uCode API: IWL_RATE_MIMO_6M_PLCP, etc. */
u8 ieee; /* MAC header: IWL_RATE_6M_IEEE, etc. */
u8 prev_ieee; /* previous rate in IEEE speeds */
u8 next_ieee; /* next rate in IEEE speeds */
u8 prev_rs; /* previous rate used in rs algo */
......@@ -42,6 +42,7 @@ struct iwl4965_rate_info {
u8 next_rs_tgg; /* next rate used in TGG rs algo */
};
/* For driver (not uCode API) */
enum {
IWL_RATE_1M_INDEX = 0,
IWL_RATE_2M_INDEX,
......@@ -83,6 +84,7 @@ enum {
#define IWL_RATE_5M_MASK (1<<IWL_RATE_5M_INDEX)
#define IWL_RATE_11M_MASK (1<<IWL_RATE_11M_INDEX)
/* 4965 uCode API values for legacy bit rates, both OFDM and CCK */
enum {
IWL_RATE_6M_PLCP = 13,
IWL_RATE_9M_PLCP = 15,
......@@ -99,7 +101,7 @@ enum {
IWL_RATE_11M_PLCP = 110,
};
/* OFDM HT rate plcp */
/* 4965 uCode API values for OFDM high-throughput (HT) bit rates */
enum {
IWL_RATE_SISO_6M_PLCP = 0,
IWL_RATE_SISO_12M_PLCP = 1,
......@@ -121,6 +123,7 @@ enum {
IWL_RATE_MIMO_INVM_PLCP = IWL_RATE_SISO_INVM_PLCP,
};
/* MAC header values for bit rates */
enum {
IWL_RATE_6M_IEEE = 12,
IWL_RATE_9M_IEEE = 18,
......@@ -170,13 +173,8 @@ enum {
#define IWL_MIN_RSSI_VAL -100
#define IWL_MAX_RSSI_VAL 0
#define IWL_LEGACY_SWITCH_ANTENNA 0
#define IWL_LEGACY_SWITCH_SISO 1
#define IWL_LEGACY_SWITCH_MIMO 2
#define IWL_RS_GOOD_RATIO 12800
#define IWL_ACTION_LIMIT 3
/* These values specify how many Tx frame attempts before
* searching for a new modulation mode */
#define IWL_LEGACY_FAILURE_LIMIT 160
#define IWL_LEGACY_SUCCESS_LIMIT 480
#define IWL_LEGACY_TABLE_COUNT 160
......@@ -185,29 +183,44 @@ enum {
#define IWL_NONE_LEGACY_SUCCESS_LIMIT 4500
#define IWL_NONE_LEGACY_TABLE_COUNT 1500
#define IWL_RATE_SCALE_SWITCH (10880)
/* Success ratio (ACKed / attempted tx frames) values (perfect is 128 * 100) */
#define IWL_RS_GOOD_RATIO 12800 /* 100% */
#define IWL_RATE_SCALE_SWITCH 10880 /* 85% */
#define IWL_RATE_HIGH_TH 10880 /* 85% */
#define IWL_RATE_INCREASE_TH 8960 /* 70% */
#define IWL_RATE_DECREASE_TH 1920 /* 15% */
/* possible actions when in legacy mode */
#define IWL_LEGACY_SWITCH_ANTENNA 0
#define IWL_LEGACY_SWITCH_SISO 1
#define IWL_LEGACY_SWITCH_MIMO 2
/* possible actions when in siso mode */
#define IWL_SISO_SWITCH_ANTENNA 0
#define IWL_SISO_SWITCH_MIMO 1
#define IWL_SISO_SWITCH_GI 2
/* possible actions when in mimo mode */
#define IWL_MIMO_SWITCH_ANTENNA_A 0
#define IWL_MIMO_SWITCH_ANTENNA_B 1
#define IWL_MIMO_SWITCH_GI 2
#define LQ_SIZE 2
#define IWL_ACTION_LIMIT 3 /* # possible actions */
#define LQ_SIZE 2 /* 2 mode tables: "Active" and "Search" */
extern const struct iwl4965_rate_info iwl4965_rates[IWL_RATE_COUNT];
enum iwl4965_table_type {
LQ_NONE,
LQ_G,
LQ_G, /* legacy types */
LQ_A,
LQ_SISO,
LQ_SISO, /* high-throughput types */
LQ_MIMO,
LQ_MAX,
};
/* 4965 has 2 antennas/chains for Tx (but 3 for Rx) */
enum iwl4965_antenna_type {
ANT_NONE,
ANT_MAIN,
......
drivers/net/wireless/iwlwifi/iwl-4965.h
View file @ 77626355
......@@ -489,7 +489,7 @@ struct sta_ht_info {
u8 supported_chan_width;
u8 extension_chan_offset;
u8 is_green_field;
u8 sgf;
u8 sgf; /* HT_SHORT_GI_* short guard interval */
u8 supp_rates[16];
u8 tx_chan_width;
u8 chan_width_cap;
......
drivers/net/wireless/iwlwifi/iwl4965-base.c
View file @ 77626355
......@@ -1488,6 +1488,7 @@ int iwl4965_rate_index_from_plcp(int plcp)
{
int i = 0;
/* 4965 HT rate format */
if (plcp & RATE_MCS_HT_MSK) {
i = (plcp & 0xff);
......@@ -1501,6 +1502,8 @@ int iwl4965_rate_index_from_plcp(int plcp)
if ((i >= IWL_FIRST_OFDM_RATE) &&
(i <= IWL_LAST_OFDM_RATE))
return i;
/* 4965 legacy rate format, search for match in table */
} else {
for (i = 0; i < ARRAY_SIZE(iwl4965_rates); i++)
if (iwl4965_rates[i].plcp == (plcp &0xFF))
......
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