mac80211: fix short slot handling

This patch makes mac80211 handle short slot requests from the AP
properly. Also warn about uses of IEEE80211_CONF_SHORT_SLOT_TIME
and optimise out the code since it cannot ever be hit anyway.

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

3 files changed, 62 insertions, 49 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 2fab5a7e5db7..d1466e7a47b8 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -180,8 +180,12 @@ enum ieee80211_bss_change {
  * @assoc: association status
  * @aid: association ID number, valid only when @assoc is true
  * @use_cts_prot: use CTS protection
- * @use_short_preamble: use 802.11b short preamble
- * @use_short_slot: use short slot time (only relevant for ERP)
+ * @use_short_preamble: use 802.11b short preamble;
+ *      if the hardware cannot handle this it must set the
+ *      IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE hardware flag
+ * @use_short_slot: use short slot time (only relevant for ERP);
+ *      if the hardware cannot handle this it must set the
+ *      IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE hardware flag
  * @dtim_period: num of beacons before the next DTIM, for PSM
  * @timestamp: beacon timestamp
  * @beacon_int: beacon interval
@@ -442,23 +446,23 @@ struct ieee80211_rx_status {
  *
  * Flags to define PHY configuration options
  *
- * @IEEE80211_CONF_SHORT_SLOT_TIME: use 802.11g short slot time
  * @IEEE80211_CONF_RADIOTAP: add radiotap header at receive time (if supported)
  * @IEEE80211_CONF_SUPPORT_HT_MODE: use 802.11n HT capabilities (if supported)
  * @IEEE80211_CONF_PS: Enable 802.11 power save mode
  */
 enum ieee80211_conf_flags {
-        /*
-         * TODO: IEEE80211_CONF_SHORT_SLOT_TIME will be removed once drivers
-         * have been converted to use bss_info_changed() for slot time
-         * configuration
-         */
-        IEEE80211_CONF_SHORT_SLOT_TIME  = (1<<0),
-        IEEE80211_CONF_RADIOTAP         = (1<<1),
-        IEEE80211_CONF_SUPPORT_HT_MODE  = (1<<2),
-        IEEE80211_CONF_PS               = (1<<3),
+        IEEE80211_CONF_RADIOTAP         = (1<<0),
+        IEEE80211_CONF_SUPPORT_HT_MODE  = (1<<1),
+        IEEE80211_CONF_PS               = (1<<2),
 };
 
+/* XXX: remove all this once drivers stop trying to use it */
+static inline int __deprecated __IEEE80211_CONF_SHORT_SLOT_TIME(void)
+{
+        return 0;
+}
+#define IEEE80211_CONF_SHORT_SLOT_TIME (__IEEE80211_CONF_SHORT_SLOT_TIME())
+
 /**
  * struct ieee80211_conf - configuration of the device
  *
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index d1c4e86b215c..c427954fe8e8 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -346,9 +346,12 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 
 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 {
-        sdata->bss_conf.use_cts_prot = 0;
-        sdata->bss_conf.use_short_preamble = 0;
-        return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
+        sdata->bss_conf.use_cts_prot = false;
+        sdata->bss_conf.use_short_preamble = false;
+        sdata->bss_conf.use_short_slot = false;
+        return BSS_CHANGED_ERP_CTS_PROT |
+               BSS_CHANGED_ERP_PREAMBLE |
+               BSS_CHANGED_ERP_SLOT;
 }
 
 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 6ad2619db85f..829995e740a7 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -568,15 +568,27 @@ static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
         }
 }
 
-static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
-                                           bool use_protection,
-                                           bool use_short_preamble)
+static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
+                                           u16 capab, bool erp_valid, u8 erp)
 {
         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 #endif
         u32 changed = 0;
+        bool use_protection;
+        bool use_short_preamble;
+        bool use_short_slot;
+
+        if (erp_valid) {
+                use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
+                use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
+        } else {
+                use_protection = false;
+                use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
+        }
+
+        use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
 
         if (use_protection != bss_conf->use_cts_prot) {
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
@@ -605,30 +617,18 @@ static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
                 changed |= BSS_CHANGED_ERP_PREAMBLE;
         }
 
-        return changed;
-}
-
-static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
-                                   u8 erp_value)
-{
-        bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
-        bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
-
-        return ieee80211_handle_protect_preamb(sdata,
-                        use_protection, use_short_preamble);
-}
-
-static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
-                                           struct ieee80211_bss *bss)
-{
-        u32 changed = 0;
-
-        if (bss->has_erp_value)
-                changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
-        else {
-                u16 capab = bss->capability;
-                changed |= ieee80211_handle_protect_preamb(sdata, false,
-                                (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
+        if (use_short_slot != bss_conf->use_short_slot) {
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+                if (net_ratelimit()) {
+                        printk(KERN_DEBUG "%s: switched to %s slot"
+                               " (BSSID=%s)\n",
+                               sdata->dev->name,
+                               use_short_slot ? "short" : "long",
+                               ifsta->bssid);
+                }
+#endif
+                bss_conf->use_short_slot = use_short_slot;
+                changed |= BSS_CHANGED_ERP_SLOT;
         }
 
         return changed;
@@ -721,7 +721,8 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
                 sdata->bss_conf.timestamp = bss->timestamp;
                 sdata->bss_conf.dtim_period = bss->dtim_period;
 
-                changed |= ieee80211_handle_bss_capability(sdata, bss);
+                changed |= ieee80211_handle_bss_capability(sdata,
+                        bss->capability, bss->has_erp_value, bss->erp_value);
 
                 ieee80211_rx_bss_put(local, bss);
         }
@@ -1657,6 +1658,8 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
         struct ieee80211_local *local = sdata->local;
         struct ieee80211_conf *conf = &local->hw.conf;
         u32 changed = 0;
+        bool erp_valid;
+        u8 erp_value = 0;
 
         /* Process beacon from the current BSS */
         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
@@ -1678,13 +1681,16 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
         ieee80211_sta_wmm_params(local, ifsta, elems.wmm_param,
                                  elems.wmm_param_len);
 
-        if (elems.erp_info && elems.erp_info_len >= 1)
-                changed |= ieee80211_handle_erp_ie(sdata, elems.erp_info[0]);
-        else {
-                u16 capab = le16_to_cpu(mgmt->u.beacon.capab_info);
-                changed |= ieee80211_handle_protect_preamb(sdata, false,
-                                (capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
+
+        if (elems.erp_info && elems.erp_info_len >= 1) {
+                erp_valid = true;
+                erp_value = elems.erp_info[0];
+        } else {
+                erp_valid = false;
         }
+        changed |= ieee80211_handle_bss_capability(sdata,
+                        le16_to_cpu(mgmt->u.beacon.capab_info),
+                        erp_valid, erp_value);
 
         if (elems.ht_cap_elem && elems.ht_info_elem &&
             elems.wmm_param && conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {