iwlwifi: allow user to set max rate
allow user to set max rate through #iwconfig <inteface> rate XXX.
mac80211 will try to force this if user set it, but driver is not
in sync which cause mac80211 to report wrong current rate. This
patch will check if max rate is set and force it 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>
diff --git a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
index 25b4356..044abf7 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945-rs.c
@@ -651,6 +651,7 @@
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
u16 fc;
u16 rate_mask = 0;
+ s8 max_rate_idx = -1;
struct iwl_priv *priv = (struct iwl_priv *)priv_r;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
@@ -675,6 +676,13 @@
return;
}
+ /* get user max rate if set */
+ max_rate_idx = txrc->max_rate_idx;
+ if ((sband->band == IEEE80211_BAND_5GHZ) && (max_rate_idx != -1))
+ max_rate_idx += IWL_FIRST_OFDM_RATE;
+ if ((max_rate_idx < 0) || (max_rate_idx >= IWL_RATE_COUNT))
+ max_rate_idx = -1;
+
index = min(rs_sta->last_txrate_idx & 0xffff, IWL_RATE_COUNT_3945 - 1);
if (sband->band == IEEE80211_BAND_5GHZ)
@@ -706,6 +714,12 @@
rs_sta->start_rate = IWL_RATE_INVALID;
}
+ /* force user max rate if set by user */
+ if ((max_rate_idx != -1) && (max_rate_idx < index)) {
+ if (rate_mask & (1 << max_rate_idx))
+ index = max_rate_idx;
+ }
+
window = &(rs_sta->win[index]);
fail_count = window->counter - window->success_counter;
@@ -732,6 +746,10 @@
low = high_low & 0xff;
high = (high_low >> 8) & 0xff;
+ /* If user set max rate, dont allow higher than user constrain */
+ if ((max_rate_idx != -1) && (max_rate_idx < high))
+ high = IWL_RATE_INVALID;
+
if (low != IWL_RATE_INVALID)
low_tpt = rs_sta->win[low].average_tpt;