iwlwifi: handle unicast PS buffering

Using the new mac80211 functionality, this makes
iwlwifi handle unicast PS buffering correctly.
The device works like this:

 * when a station goes to sleep, the microcode notices
   this and marks the station as asleep
 * when the station is marked asleep, the microcode
   refuses to transmit to the station and rejects all
   frames queued to it with the failure status code
   TX_STATUS_FAIL_DEST_PS (a previous patch handled
   this correctly)
 * when we need to send frames to the station _although_
   it is asleep, we need to tell the ucode how many,
   and this is asynchronous with sending so we cannot
   just send the frames, we need to wait for all other
   frames to be flushed, and then update the counter
   before sending out the poll response frames. This
   is handled partially in the driver and partially in
   mac80211.

In order to do all this correctly, we need to
 * keep track of how many frames are pending for each
   associated client station (avoid doing it for other
   stations to avoid the atomic ops)
 * tell mac80211 that we driver-block the PS status
   while there are still frames pending on the queues,
   and once they are all rejected (due to the dest sta
   being in PS) unblock mac80211

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

1 files changed, 41 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 1c6506529b6e..6385cdf24d13 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -2744,6 +2744,45 @@ static int iwl_mac_get_stats(struct ieee80211_hw *hw,
         return 0;
 }
 
+static void iwl_mac_sta_notify(struct ieee80211_hw *hw,
+                               struct ieee80211_vif *vif,
+                               enum sta_notify_cmd cmd,
+                               struct ieee80211_sta *sta)
+{
+        struct iwl_priv *priv = hw->priv;
+        struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
+        int sta_id;
+
+        /*
+         * TODO: We really should use this callback to
+         *       actually maintain the station table in
+         *       the device.
+         */
+
+        switch (cmd) {
+        case STA_NOTIFY_ADD:
+                atomic_set(&sta_priv->pending_frames, 0);
+                if (vif->type == NL80211_IFTYPE_AP)
+                        sta_priv->client = true;
+                break;
+        case STA_NOTIFY_SLEEP:
+                WARN_ON(!sta_priv->client);
+                sta_priv->asleep = true;
+                if (atomic_read(&sta_priv->pending_frames) > 0)
+                        ieee80211_sta_block_awake(hw, sta, true);
+                break;
+        case STA_NOTIFY_AWAKE:
+                WARN_ON(!sta_priv->client);
+                sta_priv->asleep = false;
+                sta_id = iwl_find_station(priv, sta->addr);
+                if (sta_id != IWL_INVALID_STATION)
+                        iwl_sta_modify_ps_wake(priv, sta_id);
+                break;
+        default:
+                break;
+        }
+}
+
 /*****************************************************************************
  *
  * sysfs attributes
@@ -3175,7 +3214,8 @@ static struct ieee80211_ops iwl_hw_ops = {
         .reset_tsf = iwl_mac_reset_tsf,
         .bss_info_changed = iwl_bss_info_changed,
         .ampdu_action = iwl_mac_ampdu_action,
-        .hw_scan = iwl_mac_hw_scan
+        .hw_scan = iwl_mac_hw_scan,
+        .sta_notify = iwl_mac_sta_notify,
 };
 
 static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)