mac80211: add PS flag to bss_conf

Currently, ps mode is indicated per device (rather than
per interface), which doesn't make a lot of sense.

Moreover, there are subtle bugs caused by the inability
to indicate ps change along with other changes
(e.g. when the AP deauth us, we'd like to indicate
CHANGED_PS | CHANGED_ASSOC, as changing PS before
notifying about disassociation will result in null-packets
being sent (if IEEE80211_HW_SUPPORTS_DYNAMIC_PS) while
the sta is already disconnected.)

Keep the current per-device notifications, and add
parallel per-vif notifications.

In order to keep it simple, the per-device ps and
the per-vif ps are orthogonal - the per-vif ps
configuration is determined only by the user
configuration (enable/disable) and the connection
state, and is not affected by other vifs state and
(temporary) dynamic_ps/offchannel operations
(unlike per-device ps).

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

4 files changed, 22 insertions, 3 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index d41974aacf51..06b8d39780e9 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1285,9 +1285,10 @@ static int ieee80211_change_station(struct wiphy *wiphy,
         mutex_unlock(&local->sta_mtx);
 
         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
-            params->sta_flags_mask & BIT(NL80211_STA_FLAG_AUTHORIZED))
+            params->sta_flags_mask & BIT(NL80211_STA_FLAG_AUTHORIZED)) {
                 ieee80211_recalc_ps(local, -1);
-
+                ieee80211_recalc_ps_vif(sdata);
+        }
         return 0;
 }
 
@@ -2079,6 +2080,7 @@ static int ieee80211_set_power_mgmt(struct wiphy *wiphy, struct net_device *dev,
                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
 
         ieee80211_recalc_ps(local, -1);
+        ieee80211_recalc_ps_vif(sdata);
 
         return 0;
 }
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 3e2f03b1b50e..8e65ad9c870a 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1203,6 +1203,7 @@ int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
 void ieee80211_send_pspoll(struct ieee80211_local *local,
                            struct ieee80211_sub_if_data *sdata);
 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency);
+void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata);
 int ieee80211_max_network_latency(struct notifier_block *nb,
                                   unsigned long data, void *dummy);
 int ieee80211_set_arp_filter(struct ieee80211_sub_if_data *sdata);
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index f0d6fa283071..ea46c6446450 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1032,6 +1032,16 @@ void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
         ieee80211_change_ps(local);
 }
 
+void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
+{
+        bool ps_allowed = ieee80211_powersave_allowed(sdata);
+
+        if (sdata->vif.bss_conf.ps != ps_allowed) {
+                sdata->vif.bss_conf.ps = ps_allowed;
+                ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
+        }
+}
+
 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
 {
         struct ieee80211_local *local =
@@ -1335,6 +1345,8 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
         ieee80211_recalc_smps(local);
         mutex_unlock(&local->iflist_mtx);
 
+        ieee80211_recalc_ps_vif(sdata);
+
         netif_tx_start_all_queues(sdata->dev);
         netif_carrier_on(sdata->dev);
 }
@@ -1396,6 +1408,9 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
         }
         local->ps_sdata = NULL;
 
+        /* disable per-vif ps */
+        ieee80211_recalc_ps_vif(sdata);
+
         /* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
         if (tx)
                 drv_flush(local, false);
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 39b82fee4904..037d148e9f19 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1359,7 +1359,8 @@ int ieee80211_reconfig(struct ieee80211_local *local)
                 switch (sdata->vif.type) {
                 case NL80211_IFTYPE_STATION:
                         changed |= BSS_CHANGED_ASSOC |
-                                   BSS_CHANGED_ARP_FILTER;
+                                   BSS_CHANGED_ARP_FILTER |
+                                   BSS_CHANGED_PS;
                         mutex_lock(&sdata->u.mgd.mtx);
                         ieee80211_bss_info_change_notify(sdata, changed);
                         mutex_unlock(&sdata->u.mgd.mtx);