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iwl3945: Fix rate scale for B-mode connection

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This patch make sure we use only CCK rate for B only network.
For 3945 driver, it sets REPLY_RATE_SCALE command every time
we connect to a new network. In this command we set for every
rate the number of try and next rate. The problem mac80211 reports
same mode for both B and G mode as IEEE80211_BAND_2GHZ which will cause
using invalid rate other than CCK in B only network. THis patch
on association will examine sta valid rate on association, if no
OFDM rate in valid available rates it considers it as B only mode so
we can set REPLY_RATE_SCALE command with valid B only network and only
choose CCK rate in rate scaling.

Signed-off-by: Mohamed Abbas <mohamed.abbas@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Abbas, Mohamed 2008-12-05 07:58:37 -08:00 committed by John W. Linville
parent 00e540b376
commit 7262796ab7
3 changed files with 39 additions and 16 deletions
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12
drivers/net/wireless/iwlwifi/iwl-3945-rs.c
View file

@ -335,10 +335,11 @@ static void iwl3945_collect_tx_data(struct iwl3945_rs_sta *rs_sta,
}
static void rs_rate_init(void *priv, struct ieee80211_supported_band *sband,
static void rs_rate_init(void *priv_r, struct ieee80211_supported_band *sband,
struct ieee80211_sta *sta, void *priv_sta)
{
struct iwl3945_rs_sta *rs_sta = priv_sta;
struct iwl3945_priv *priv = (struct iwl3945_priv *)priv_r;
int i;
IWL_DEBUG_RATE("enter\n");
@ -348,16 +349,21 @@ static void rs_rate_init(void *priv, struct ieee80211_supported_band *sband,
* previous packets? Need to have IEEE 802.1X auth succeed immediately
* after assoc.. */
for (i = IWL_RATE_COUNT - 1; i >= 0; i--) {
for (i = sband->n_bitrates - 1; i >= 0; i--) {
if (sta->supp_rates[sband->band] & (1 << i)) {
rs_sta->last_txrate_idx = i;
break;
}
}
priv->sta_supp_rates = sta->supp_rates[sband->band];
/* For 5 GHz band it start at IWL_FIRST_OFDM_RATE */
if (sband->band == IEEE80211_BAND_5GHZ)
if (sband->band == IEEE80211_BAND_5GHZ) {
rs_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
priv->sta_supp_rates = priv->sta_supp_rates <<
IWL_FIRST_OFDM_RATE;
}
IWL_DEBUG_RATE("leave\n");
}

41
drivers/net/wireless/iwlwifi/iwl-3945.c
View file

@ -277,12 +277,14 @@ int iwl3945_rs_next_rate(struct iwl3945_priv *priv, int rate)
else if (rate == IWL_RATE_6M_INDEX)
next_rate = IWL_RATE_6M_INDEX;
break;
/* XXX cannot be invoked in current mac80211 so not a regression
case MODE_IEEE80211B:
if (rate == IWL_RATE_11M_INDEX_TABLE)
next_rate = IWL_RATE_5M_INDEX_TABLE;
case IEEE80211_BAND_2GHZ:
if (!(priv->sta_supp_rates & IWL_OFDM_RATES_MASK) &&
iwl3945_is_associated(priv)) {
if (rate == IWL_RATE_11M_INDEX)
next_rate = IWL_RATE_5M_INDEX;
}
break;
*/
default:
break;
}
@ -2378,7 +2380,8 @@ int iwl3945_init_hw_rate_table(struct iwl3945_priv *priv)
iwl3945_hw_set_rate_n_flags(iwl3945_rates[i].plcp, 0);
table[index].try_cnt = priv->retry_rate;
prev_index = iwl3945_get_prev_ieee_rate(i);
table[index].next_rate_index = iwl3945_rates[prev_index].table_rs_index;
table[index].next_rate_index =
iwl3945_rates[prev_index].table_rs_index;
}
switch (priv->band) {
@ -2386,11 +2389,14 @@ int iwl3945_init_hw_rate_table(struct iwl3945_priv *priv)
IWL_DEBUG_RATE("Select A mode rate scale\n");
/* If one of the following CCK rates is used,
* have it fall back to the 6M OFDM rate */
for (i = IWL_RATE_1M_INDEX_TABLE; i <= IWL_RATE_11M_INDEX_TABLE; i++)
table[i].next_rate_index = iwl3945_rates[IWL_FIRST_OFDM_RATE].table_rs_index;
for (i = IWL_RATE_1M_INDEX_TABLE;
i <= IWL_RATE_11M_INDEX_TABLE; i++)
table[i].next_rate_index =
iwl3945_rates[IWL_FIRST_OFDM_RATE].table_rs_index;
/* Don't fall back to CCK rates */
table[IWL_RATE_12M_INDEX_TABLE].next_rate_index = IWL_RATE_9M_INDEX_TABLE;
table[IWL_RATE_12M_INDEX_TABLE].next_rate_index =
IWL_RATE_9M_INDEX_TABLE;
/* Don't drop out of OFDM rates */
table[IWL_RATE_6M_INDEX_TABLE].next_rate_index =
@ -2401,11 +2407,20 @@ int iwl3945_init_hw_rate_table(struct iwl3945_priv *priv)
IWL_DEBUG_RATE("Select B/G mode rate scale\n");
/* If an OFDM rate is used, have it fall back to the
* 1M CCK rates */
for (i = IWL_RATE_6M_INDEX_TABLE; i <= IWL_RATE_54M_INDEX_TABLE; i++)
table[i].next_rate_index = iwl3945_rates[IWL_FIRST_CCK_RATE].table_rs_index;
/* CCK shouldn't fall back to OFDM... */
table[IWL_RATE_11M_INDEX_TABLE].next_rate_index = IWL_RATE_5M_INDEX_TABLE;
if (!(priv->sta_supp_rates & IWL_OFDM_RATES_MASK) &&
iwl3945_is_associated(priv)) {
index = IWL_FIRST_CCK_RATE;
for (i = IWL_RATE_6M_INDEX_TABLE;
i <= IWL_RATE_54M_INDEX_TABLE; i++)
table[i].next_rate_index =
iwl3945_rates[index].table_rs_index;
index = IWL_RATE_11M_INDEX_TABLE;
/* CCK shouldn't fall back to OFDM... */
table[index].next_rate_index = IWL_RATE_5M_INDEX_TABLE;
}
break;
default:

2
drivers/net/wireless/iwlwifi/iwl-3945.h
View file

@ -810,6 +810,8 @@ struct iwl3945_priv {
u16 active_rate;
u16 active_rate_basic;
u32 sta_supp_rates;
u8 call_post_assoc_from_beacon;
/* Rate scaling data */
s8 data_retry_limit;