mac80211: rewrite HT handling

The HT handling has the following deficiencies, which I've
(partially) fixed:
 * it always uses the AP info even if there is no AP,
   hence has no chance of working as an AP
 * it pretends to be HW config, but really is per-BSS
 * channel sanity checking is left to the drivers
 * it generally lets the driver control too much

HT enabling is still wrong with this patch if you have more than
one virtual STA mode interface, but that never happens currently.
Once WDS, IBSS or AP/VLAN gets HT capabilities, it will also be
wrong, see the comment in ieee80211_enable_ht().

Additionally, this fixes a number of bugs:
 * mac80211: ieee80211_set_disassoc doesn't notify the driver any
             more since the refactoring
 * iwl-agn-rs: always uses the HT capabilities from the wrong stuff
               mac80211 gives it rather than the actual peer STA
 * ath9k: a number of bugs resulting from the broken HT API

I'm not entirely happy with putting the HT capabilities into
struct ieee80211_sta as restricted to our own HT TX capabilities,
but I see no cleaner solution for now.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 26 insertions, 13 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 79a24410dd0a..7c3eb3d8f7e7 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -552,17 +552,30 @@ static int iwl4965_send_beacon_cmd(struct iwl_priv *priv)
 static void iwl4965_ht_conf(struct iwl_priv *priv,
                             struct ieee80211_bss_conf *bss_conf)
 {
-        struct ieee80211_sta_ht_cap *ht_conf = bss_conf->ht_cap;
-        struct ieee80211_ht_bss_info *ht_bss_conf = bss_conf->ht_bss_conf;
+        struct ieee80211_sta_ht_cap *ht_conf;
         struct iwl_ht_info *iwl_conf = &priv->current_ht_config;
+        struct ieee80211_sta *sta;
 
         IWL_DEBUG_MAC80211("enter: \n");
 
-        iwl_conf->is_ht = bss_conf->assoc_ht;
-
         if (!iwl_conf->is_ht)
                 return;
 
+
+        /*
+         * It is totally wrong to base global information on something
+         * that is valid only when associated, alas, this driver works
+         * that way and I don't know how to fix it.
+         */
+
+        rcu_read_lock();
+        sta = ieee80211_find_sta(priv->hw, priv->bssid);
+        if (!sta) {
+                rcu_read_unlock();
+                return;
+        }
+        ht_conf = &sta->ht_cap;
+
         if (ht_conf->cap & IEEE80211_HT_CAP_SGI_20)
                 iwl_conf->sgf |= HT_SHORT_GI_20MHZ;
         if (ht_conf->cap & IEEE80211_HT_CAP_SGI_40)
@@ -574,8 +587,8 @@ static void iwl4965_ht_conf(struct iwl_priv *priv,
 
         iwl_conf->supported_chan_width =
                 !!(ht_conf->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40);
-        iwl_conf->extension_chan_offset =
-                ht_bss_conf->bss_cap & IEEE80211_HT_PARAM_CHA_SEC_OFFSET;
+
+        iwl_conf->extension_chan_offset = bss_conf->ht.secondary_channel_offset;
         /* If no above or below channel supplied disable FAT channel */
         if (iwl_conf->extension_chan_offset != IEEE80211_HT_PARAM_CHA_SEC_ABOVE &&
             iwl_conf->extension_chan_offset != IEEE80211_HT_PARAM_CHA_SEC_BELOW) {
@@ -587,15 +600,14 @@ static void iwl4965_ht_conf(struct iwl_priv *priv,
 
         memcpy(&iwl_conf->mcs, &ht_conf->mcs, 16);
 
-        iwl_conf->control_channel = ht_bss_conf->primary_channel;
-        iwl_conf->tx_chan_width =
-                !!(ht_bss_conf->bss_cap & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY);
+        iwl_conf->tx_chan_width = bss_conf->ht.width_40_ok;
         iwl_conf->ht_protection =
-                ht_bss_conf->bss_op_mode & IEEE80211_HT_OP_MODE_PROTECTION;
+                bss_conf->ht.operation_mode & IEEE80211_HT_OP_MODE_PROTECTION;
         iwl_conf->non_GF_STA_present =
-                !!(ht_bss_conf->bss_op_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
+                !!(bss_conf->ht.operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
+
+        rcu_read_unlock();
 
-        IWL_DEBUG_MAC80211("control channel %d\n", iwl_conf->control_channel);
         IWL_DEBUG_MAC80211("leave\n");
 }
 
@@ -2746,6 +2758,8 @@ static int iwl4965_mac_config(struct ieee80211_hw *hw, u32 changed)
         mutex_lock(&priv->mutex);
         IWL_DEBUG_MAC80211("enter to channel %d\n", conf->channel->hw_value);
 
+        priv->current_ht_config.is_ht = conf->ht.enabled;
+
         if (conf->radio_enabled && iwl_radio_kill_sw_enable_radio(priv)) {
                 IWL_DEBUG_MAC80211("leave - RF-KILL - waiting for uCode\n");
                 goto out;
@@ -3104,7 +3118,6 @@ static void iwl4965_bss_info_changed(struct ieee80211_hw *hw,
         }
 
         if (changes & BSS_CHANGED_HT) {
-                IWL_DEBUG_MAC80211("HT %d\n", bss_conf->assoc_ht);
                 iwl4965_ht_conf(priv, bss_conf);
                 iwl_set_rxon_chain(priv);
         }