WLAN_RC_HT_FLAG, /* Phy rates allowed initially */
};
-/* VALID_ALL - valid for 20/40/Legacy,
- * VALID - Legacy only,
- * VALID_20 - HT 20 only,
- * VALID_40 - HT 40 only */
-
/* 4ms frame limit not used for NG mode. The values filled
* for HT are the 64K max aggregate limit */
return ath_rc_priv->valid_rate_index[index];
}
-static inline int
-ath_rc_get_nextvalid_txrate(struct ath_rate_table *rate_table,
- struct ath_rate_priv *ath_rc_priv,
- u8 cur_valid_txrate,
- u8 *next_idx)
+static inline int ath_rc_get_nextvalid_txrate(struct ath_rate_table *rate_table,
+ struct ath_rate_priv *ath_rc_priv,
+ u8 cur_valid_txrate,
+ u8 *next_idx)
{
u8 i;
/* No more valid rates */
*next_idx = 0;
+
return 0;
}
return 1;
}
}
+
return 0;
}
-static u8
-ath_rc_sib_init_validrates(struct ath_rate_priv *ath_rc_priv,
- struct ath_rate_table *rate_table,
- u32 capflag)
+static u8 ath_rc_init_validrates(struct ath_rate_priv *ath_rc_priv,
+ struct ath_rate_table *rate_table,
+ u32 capflag)
{
u8 i, hi = 0;
u32 valid;
hi = A_MAX(hi, i);
}
}
+
return hi;
}
-static u8
-ath_rc_sib_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
- struct ath_rate_table *rate_table,
- struct ath_rateset *rateset,
- u32 capflag)
+static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
+ struct ath_rate_table *rate_table,
+ struct ath_rateset *rateset,
+ u32 capflag)
{
u8 i, j, hi = 0;
u32 valid = (ath_rc_priv->single_stream ?
rate_table->info[j].valid_single_stream :
rate_table->info[j].valid);
+ u8 rate = rateset->rs_rates[i];
+ u8 dot11rate = rate_table->info[j].dot11rate;
/* We allow a rate only if its valid and the
* capflag matches one of the validity
* (VALID/VALID_20/VALID_40) flags */
- if (((rateset->rs_rates[i] & 0x7F) ==
- (rate_table->info[j].dot11rate & 0x7F)) &&
- ((valid & WLAN_RC_CAP_MODE(capflag)) ==
- WLAN_RC_CAP_MODE(capflag)) &&
- !WLAN_RC_PHY_HT(phy)) {
-
+ if (((rate & 0x7F) == (dot11rate & 0x7F)) &&
+ ((valid & WLAN_RC_CAP_MODE(capflag)) ==
+ WLAN_RC_CAP_MODE(capflag)) &&
+ !WLAN_RC_PHY_HT(phy)) {
u8 valid_rate_count = 0;
if (!ath_rc_valid_phyrate(phy, capflag, 0))
}
}
}
+
return hi;
}
-static u8
-ath_rc_sib_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
- struct ath_rate_table *rate_table,
- u8 *mcs_set, u32 capflag)
+static u8 ath_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
+ struct ath_rate_table *rate_table,
+ u8 *mcs_set, u32 capflag)
{
+ struct ath_rateset *rateset = (struct ath_rateset *)mcs_set;
+
u8 i, j, hi = 0;
/* Use intersection of working rates and valid rates */
- for (i = 0; i < ((struct ath_rateset *)mcs_set)->rs_nrates; i++) {
+ for (i = 0; i < rateset->rs_nrates; i++) {
for (j = 0; j < rate_table->rate_cnt; j++) {
u32 phy = rate_table->info[j].phy;
u32 valid = (ath_rc_priv->single_stream ?
rate_table->info[j].valid_single_stream :
rate_table->info[j].valid);
+ u8 rate = rateset->rs_rates[i];
+ u8 dot11rate = rate_table->info[j].dot11rate;
- if (((((struct ath_rateset *)
- mcs_set)->rs_rates[i] & 0x7F) !=
- (rate_table->info[j].dot11rate & 0x7F)) ||
+ if (((rate & 0x7F) != (dot11rate & 0x7F)) ||
!WLAN_RC_PHY_HT(phy) ||
!WLAN_RC_PHY_HT_VALID(valid, capflag))
continue;
hi = A_MAX(hi, j);
}
}
- return hi;
-}
-
-u8 ath_rate_findrateix(struct ath_softc *sc,
- u8 dot11rate)
-{
- struct ath_rate_table *ratetable;
- int i;
-
- ratetable = sc->hw_rate_table[sc->sc_curmode];
-
- if (WARN_ON(!ratetable))
- return 0;
-
- for (i = 0; i < ratetable->rate_cnt; i++) {
- if ((ratetable->info[i].dot11rate & 0x7f) == (dot11rate & 0x7f))
- return i;
- }
- return 0;
+ return hi;
}
static u8 ath_rc_ratefind_ht(struct ath_softc *sc,
static void ath_rc_rate_set_series(struct ath_rate_table *rate_table ,
struct ieee80211_tx_rate *rate,
- u8 tries,
- u8 rix,
- int rtsctsenable)
+ u8 tries, u8 rix, int rtsctsenable)
{
rate->count = tries;
rate->idx = rix;
}
}
-static void ath_rc_update_ht(struct ath_softc *sc,
- struct ath_rate_priv *ath_rc_priv,
- struct ath_tx_info_priv *tx_info_priv,
- int tx_rate, int xretries, int retries)
+static bool ath_rc_update_per(struct ath_softc *sc,
+ struct ath_rate_table *rate_table,
+ struct ath_rate_priv *ath_rc_priv,
+ struct ath_tx_info_priv *tx_info_priv,
+ int tx_rate, int xretries, int retries,
+ u32 now_msec)
{
- u32 now_msec = jiffies_to_msecs(jiffies);
- int state_change = 0, rate, count;
+ bool state_change = false;
+ int count;
u8 last_per;
- struct ath_rate_table *rate_table = sc->hw_rate_table[sc->sc_curmode];
static u32 nretry_to_per_lookup[10] = {
100 * 0 / 1,
100 * 1 / 4,
100 * 9 / 10
};
- if (!ath_rc_priv)
- return;
-
- ASSERT(tx_rate >= 0);
- if (tx_rate < 0)
- return;
-
- /* To compensate for some imbalance between ctrl and ext. channel */
-
- if (WLAN_RC_PHY_40(rate_table->info[tx_rate].phy))
- tx_info_priv->tx.ts_rssi =
- tx_info_priv->tx.ts_rssi < 3 ? 0 :
- tx_info_priv->tx.ts_rssi - 3;
-
last_per = ath_rc_priv->state[tx_rate].per;
if (xretries) {
- /* Update the PER. */
if (xretries == 1) {
ath_rc_priv->state[tx_rate].per += 30;
if (ath_rc_priv->state[tx_rate].per > 100)
count = ARRAY_SIZE(nretry_to_per_lookup);
if (retries >= count)
retries = count - 1;
+
/* new_PER = 7/8*old_PER + 1/8*(currentPER) */
ath_rc_priv->state[tx_rate].per =
- (u8)(ath_rc_priv->state[tx_rate].per -
- (ath_rc_priv->state[tx_rate].per >> 3) +
- ((100) >> 3));
+ (u8)(last_per - (last_per >> 3) + (100 >> 3));
}
/* xretries == 1 or 2 */
if (ath_rc_priv->probe_rate == tx_rate)
ath_rc_priv->probe_rate = 0;
- } else { /* xretries == 0 */
- /* Update the PER. */
- /* Make sure it doesn't index out of array's bounds. */
+ } else { /* xretries == 0 */
count = ARRAY_SIZE(nretry_to_per_lookup);
if (retries >= count)
retries = count - 1;
+
if (tx_info_priv->n_bad_frames) {
/* new_PER = 7/8*old_PER + 1/8*(currentPER)
* Assuming that n_frames is not 0. The current PER
* the above PER. The expression below is a
* simplified version of the sum of these two terms.
*/
- if (tx_info_priv->n_frames > 0)
- ath_rc_priv->state[tx_rate].per
- = (u8)
- (ath_rc_priv->state[tx_rate].per -
- (ath_rc_priv->state[tx_rate].per >> 3) +
- ((100*(retries*tx_info_priv->n_frames +
- tx_info_priv->n_bad_frames) /
- (tx_info_priv->n_frames *
- (retries+1))) >> 3));
+ if (tx_info_priv->n_frames > 0) {
+ int n_frames, n_bad_frames;
+ u8 cur_per, new_per;
+
+ n_bad_frames = retries * tx_info_priv->n_frames +
+ tx_info_priv->n_bad_frames;
+ n_frames = tx_info_priv->n_frames * (retries + 1);
+ cur_per = (100 * n_bad_frames / n_frames) >> 3;
+ new_per = (u8)(last_per - (last_per >> 3) + cur_per);
+ ath_rc_priv->state[tx_rate].per = new_per;
+ }
} else {
- /* new_PER = 7/8*old_PER + 1/8*(currentPER) */
-
- ath_rc_priv->state[tx_rate].per = (u8)
- (ath_rc_priv->state[tx_rate].per -
- (ath_rc_priv->state[tx_rate].per >> 3) +
- (nretry_to_per_lookup[retries] >> 3));
+ ath_rc_priv->state[tx_rate].per =
+ (u8)(last_per - (last_per >> 3) +
+ (nretry_to_per_lookup[retries] >> 3));
}
ath_rc_priv->rssi_last_prev2 = ath_rc_priv->rssi_last_prev;
* If we got at most one retry then increase the max rate if
* this was a probe. Otherwise, ignore the probe.
*/
-
if (ath_rc_priv->probe_rate && ath_rc_priv->probe_rate == tx_rate) {
if (retries > 0 || 2 * tx_info_priv->n_bad_frames >
tx_info_priv->n_frames) {
} else {
u8 probe_rate = 0;
- ath_rc_priv->rate_max_phy = ath_rc_priv->probe_rate;
+ ath_rc_priv->rate_max_phy =
+ ath_rc_priv->probe_rate;
probe_rate = ath_rc_priv->probe_rate;
if (ath_rc_priv->state[probe_rate].per > 30)
* to move up faster if the probes are
* succesful.
*/
- ath_rc_priv->probe_time = now_msec -
- rate_table->probe_interval / 2;
+ ath_rc_priv->probe_time =
+ now_msec - rate_table->probe_interval / 2;
}
}
*/
ath_rc_priv->hw_maxretry_pktcnt = 0;
} else {
+ int32_t rssi_ackAvg;
+ int8_t rssi_thres;
+ int8_t rssi_ack_vmin;
+
/*
* It worked with no retries. First ignore bogus (small)
* rssi_ack values.
ath_rc_priv->hw_maxretry_pktcnt++;
}
- if (tx_info_priv->tx.ts_rssi >=
- rate_table->info[tx_rate].rssi_ack_validmin) {
- /* Average the rssi */
- if (tx_rate != ath_rc_priv->rssi_sum_rate) {
- ath_rc_priv->rssi_sum_rate = tx_rate;
- ath_rc_priv->rssi_sum =
- ath_rc_priv->rssi_sum_cnt = 0;
- }
+ if (tx_info_priv->tx.ts_rssi <
+ rate_table->info[tx_rate].rssi_ack_validmin)
+ goto exit;
- ath_rc_priv->rssi_sum += tx_info_priv->tx.ts_rssi;
- ath_rc_priv->rssi_sum_cnt++;
-
- if (ath_rc_priv->rssi_sum_cnt > 4) {
- int32_t rssi_ackAvg =
- (ath_rc_priv->rssi_sum + 2) / 4;
- int8_t rssi_thres =
- ath_rc_priv->state[tx_rate].
- rssi_thres;
- int8_t rssi_ack_vmin =
- rate_table->info[tx_rate].
- rssi_ack_validmin;
-
- ath_rc_priv->rssi_sum =
- ath_rc_priv->rssi_sum_cnt = 0;
-
- /* Now reduce the current
- * rssi threshold. */
- if ((rssi_ackAvg < rssi_thres + 2) &&
- (rssi_thres > rssi_ack_vmin)) {
- ath_rc_priv->state[tx_rate].
- rssi_thres--;
- }
-
- state_change = 1;
- }
+ /* Average the rssi */
+ if (tx_rate != ath_rc_priv->rssi_sum_rate) {
+ ath_rc_priv->rssi_sum_rate = tx_rate;
+ ath_rc_priv->rssi_sum =
+ ath_rc_priv->rssi_sum_cnt = 0;
+ }
+
+ ath_rc_priv->rssi_sum += tx_info_priv->tx.ts_rssi;
+ ath_rc_priv->rssi_sum_cnt++;
+
+ if (ath_rc_priv->rssi_sum_cnt < 4)
+ goto exit;
+
+ rssi_ackAvg =
+ (ath_rc_priv->rssi_sum + 2) / 4;
+ rssi_thres =
+ ath_rc_priv->state[tx_rate].rssi_thres;
+ rssi_ack_vmin =
+ rate_table->info[tx_rate].rssi_ack_validmin;
+
+ ath_rc_priv->rssi_sum =
+ ath_rc_priv->rssi_sum_cnt = 0;
+
+ /* Now reduce the current rssi threshold */
+ if ((rssi_ackAvg < rssi_thres + 2) &&
+ (rssi_thres > rssi_ack_vmin)) {
+ ath_rc_priv->state[tx_rate].rssi_thres--;
}
+
+ state_change = true;
}
}
+exit:
+ return state_change;
+}
+
+/* Update PER, RSSI and whatever else that the code thinks it is doing.
+ If you can make sense of all this, you really need to go out more. */
- /* For all cases */
+static void ath_rc_update_ht(struct ath_softc *sc,
+ struct ath_rate_priv *ath_rc_priv,
+ struct ath_tx_info_priv *tx_info_priv,
+ int tx_rate, int xretries, int retries)
+{
+#define CHK_RSSI(rate) \
+ ((ath_rc_priv->state[(rate)].rssi_thres + \
+ rate_table->info[(rate)].rssi_ack_deltamin) > \
+ ath_rc_priv->state[(rate)+1].rssi_thres)
+
+ u32 now_msec = jiffies_to_msecs(jiffies);
+ int rate;
+ u8 last_per;
+ bool state_change = false;
+ struct ath_rate_table *rate_table = sc->hw_rate_table[sc->sc_curmode];
+ int size = ath_rc_priv->rate_table_size;
+
+ if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
+ return;
+
+ /* To compensate for some imbalance between ctrl and ext. channel */
+
+ if (WLAN_RC_PHY_40(rate_table->info[tx_rate].phy))
+ tx_info_priv->tx.ts_rssi =
+ tx_info_priv->tx.ts_rssi < 3 ? 0 :
+ tx_info_priv->tx.ts_rssi - 3;
+
+ last_per = ath_rc_priv->state[tx_rate].per;
+
+ /* Update PER first */
+ state_change = ath_rc_update_per(sc, rate_table, ath_rc_priv,
+ tx_info_priv, tx_rate, xretries,
+ retries, now_msec);
/*
* If this rate looks bad (high PER) then stop using it for
rate_table->info[tx_rate].ratekbps <=
rate_table->info[ath_rc_priv->rate_max_phy].ratekbps) {
ath_rc_get_nextlowervalid_txrate(rate_table, ath_rc_priv,
- (u8) tx_rate, &ath_rc_priv->rate_max_phy);
+ (u8)tx_rate, &ath_rc_priv->rate_max_phy);
/* Don't probe for a little while. */
ath_rc_priv->probe_time = now_msec;
* made to keep the rssi thresholds monotonically
* increasing between the CCK and OFDM rates.)
*/
- for (rate = tx_rate; rate <
- ath_rc_priv->rate_table_size - 1; rate++) {
+ for (rate = tx_rate; rate < size - 1; rate++) {
if (rate_table->info[rate+1].phy !=
- rate_table->info[tx_rate].phy)
+ rate_table->info[tx_rate].phy)
break;
- if (ath_rc_priv->state[rate].rssi_thres +
- rate_table->info[rate].rssi_ack_deltamin >
- ath_rc_priv->state[rate+1].rssi_thres) {
+ if (CHK_RSSI(rate)) {
ath_rc_priv->state[rate+1].rssi_thres =
- ath_rc_priv->state[rate].
- rssi_thres +
- rate_table->info[rate].
- rssi_ack_deltamin;
+ ath_rc_priv->state[rate].rssi_thres +
+ rate_table->info[rate].rssi_ack_deltamin;
}
}
rate_table->info[tx_rate].phy)
break;
- if (ath_rc_priv->state[rate].rssi_thres +
- rate_table->info[rate].rssi_ack_deltamin >
- ath_rc_priv->state[rate+1].rssi_thres) {
+ if (CHK_RSSI(rate)) {
if (ath_rc_priv->state[rate+1].rssi_thres <
- rate_table->info[rate].
- rssi_ack_deltamin)
+ rate_table->info[rate].rssi_ack_deltamin)
ath_rc_priv->state[rate].rssi_thres = 0;
else {
ath_rc_priv->state[rate].rssi_thres =
- ath_rc_priv->state[rate+1].
- rssi_thres -
- rate_table->info[rate].
- rssi_ack_deltamin;
+ ath_rc_priv->state[rate+1].rssi_thres -
+ rate_table->info[rate].rssi_ack_deltamin;
}
if (ath_rc_priv->state[rate].rssi_thres <
- rate_table->info[rate].
- rssi_ack_validmin) {
+ rate_table->info[rate].rssi_ack_validmin) {
ath_rc_priv->state[rate].rssi_thres =
- rate_table->info[rate].
- rssi_ack_validmin;
+ rate_table->info[rate].rssi_ack_validmin;
}
}
}
}
/* Maintain monotonicity for rates above the current rate */
- for (rate = tx_rate; rate < ath_rc_priv->rate_table_size - 1; rate++) {
- if (ath_rc_priv->state[rate+1].per < ath_rc_priv->state[rate].per)
+ for (rate = tx_rate; rate < size - 1; rate++) {
+ if (ath_rc_priv->state[rate+1].per <
+ ath_rc_priv->state[rate].per)
ath_rc_priv->state[rate+1].per =
ath_rc_priv->state[rate].per;
}
if (now_msec - ath_rc_priv->rssi_down_time >=
rate_table->rssi_reduce_interval) {
- for (rate = 0; rate < ath_rc_priv->rate_table_size; rate++) {
+ for (rate = 0; rate < size; rate++) {
if (ath_rc_priv->state[rate].rssi_thres >
rate_table->info[rate].rssi_ack_validmin)
ath_rc_priv->state[rate].rssi_thres -= 1;
* and PER (different for CCK and OFDM). */
if (now_msec - ath_rc_priv->per_down_time >=
rate_table->rssi_reduce_interval) {
- for (rate = 0; rate < ath_rc_priv->rate_table_size; rate++) {
+ for (rate = 0; rate < size; rate++) {
ath_rc_priv->state[rate].per =
7 * ath_rc_priv->state[rate].per / 8;
}
ath_rc_priv->per_down_time = now_msec;
}
+
+#undef CHK_RSSI
+}
+
+static int ath_rc_get_rateindex(struct ath_rate_table *rate_table,
+ struct ieee80211_tx_rate *rate)
+{
+ int rix;
+
+ if ((rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
+ (rate->flags & IEEE80211_TX_RC_SHORT_GI))
+ rix = rate_table->info[rate->idx].ht_index;
+ else if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
+ rix = rate_table->info[rate->idx].sgi_index;
+ else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+ rix = rate_table->info[rate->idx].cw40index;
+ else
+ rix = rate_table->info[rate->idx].base_index;
+
+ return rix;
}
static void ath_rc_tx_status(struct ath_softc *sc,
struct ath_rate_table *rate_table;
struct ieee80211_tx_rate *rates = tx_info->status.rates;
u8 flags;
- u32 series = 0, rix;
+ u32 i = 0, rix;
rate_table = sc->hw_rate_table[sc->sc_curmode];
*/
if (final_ts_idx != 0) {
/* Process intermediate rates that failed.*/
- for (series = 0; series < final_ts_idx ; series++) {
- if (rates[series].count != 0 && (rates[series].idx >= 0)) {
- flags = rates[series].flags;
+ for (i = 0; i < final_ts_idx ; i++) {
+ if (rates[i].count != 0 && (rates[i].idx >= 0)) {
+ flags = rates[i].flags;
+
/* If HT40 and we have switched mode from
* 40 to 20 => don't update */
+
if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
(ath_rc_priv->rc_phy_mode != WLAN_RC_40_FLAG))
return;
- if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
- (flags & IEEE80211_TX_RC_SHORT_GI))
- rix = rate_table->info[
- rates[series].idx].ht_index;
- else if (flags & IEEE80211_TX_RC_SHORT_GI)
- rix = rate_table->info[
- rates[series].idx].sgi_index;
- else if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
- rix = rate_table->info[
- rates[series].idx].cw40index;
- else
- rix = rate_table->info[
- rates[series].idx].base_index;
+ rix = ath_rc_get_rateindex(rate_table, &rates[i]);
ath_rc_update_ht(sc, ath_rc_priv,
tx_info_priv, rix,
xretries ? 1 : 2,
- rates[series].count);
+ rates[i].count);
}
}
} else {
xretries = 2;
}
- flags = rates[series].flags;
+ flags = rates[i].flags;
+
/* If HT40 and we have switched mode from 40 to 20 => don't update */
if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) &&
(ath_rc_priv->rc_phy_mode != WLAN_RC_40_FLAG)) {
return;
}
- if ((flags & IEEE80211_TX_RC_40_MHZ_WIDTH) && (flags & IEEE80211_TX_RC_SHORT_GI))
- rix = rate_table->info[rates[series].idx].ht_index;
- else if (flags & IEEE80211_TX_RC_SHORT_GI)
- rix = rate_table->info[rates[series].idx].sgi_index;
- else if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
- rix = rate_table->info[rates[series].idx].cw40index;
- else
- rix = rate_table->info[rates[series].idx].base_index;
-
+ rix = ath_rc_get_rateindex(rate_table, &rates[i]);
ath_rc_update_ht(sc, ath_rc_priv, tx_info_priv, rix,
- xretries, long_retry);
+ xretries, long_retry);
}
static void ath_rc_init(struct ath_softc *sc,
if (!rateset->rs_nrates) {
/* No working rate, just initialize valid rates */
- hi = ath_rc_sib_init_validrates(ath_rc_priv, rate_table,
+ hi = ath_rc_init_validrates(ath_rc_priv, rate_table,
ath_rc_priv->ht_cap);
} else {
/* Use intersection of working rates and valid rates */
- hi = ath_rc_sib_setvalid_rates(ath_rc_priv, rate_table,
+ hi = ath_rc_setvalid_rates(ath_rc_priv, rate_table,
rateset, ath_rc_priv->ht_cap);
if (ath_rc_priv->ht_cap & WLAN_RC_HT_FLAG) {
- hthi = ath_rc_sib_setvalid_htrates(ath_rc_priv,
+ hthi = ath_rc_setvalid_htrates(ath_rc_priv,
rate_table,
ht_mcs,
ath_rc_priv->ht_cap);
projects / platform / kernel / linux-3.10.git / commitdiff