mac80211: A-MPDU Tx add session's and low level driver's API

This patch adds the API for 3 stages in A-MPDU Tx session flow:
- request mac80211 to start/stop A-MPDU Tx session for specific TID. such a
  request should be issued by a load aware element, either mac80211 itself
  or external element.
- requests by mac80211 to low-level driver to start/stop Tx aggregation.
  notice that low level driver responds now with Starting Sequence Number.
- async feedback by low-level to mac80211 to inform that HW is ready for
  next A-MPDU Tx state.
Changes in API to Rx A-MPDU were also made, reflected in iwlwifi changes as
well.

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 89 insertions, 7 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c
index d727de8b96fe..cd4f5e383e60 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.c
@@ -4732,7 +4732,7 @@ static void iwl4965_sta_modify_del_ba_tid(struct iwl4965_priv *priv,
 
 int iwl4965_mac_ampdu_action(struct ieee80211_hw *hw,
                              enum ieee80211_ampdu_mlme_action action,
-                             const u8 *addr, u16 tid, u16 ssn)
+                             const u8 *addr, u16 tid, u16 *ssn)
 {
         struct iwl4965_priv *priv = hw->priv;
         int sta_id;
@@ -4744,7 +4744,7 @@ int iwl4965_mac_ampdu_action(struct ieee80211_hw *hw,
         switch (action) {
         case IEEE80211_AMPDU_RX_START:
                 IWL_DEBUG_HT("start Rx\n");
-                iwl4965_sta_modify_add_ba_tid(priv, sta_id, tid, ssn);
+                iwl4965_sta_modify_add_ba_tid(priv, sta_id, tid, *ssn);
                 break;
         case IEEE80211_AMPDU_RX_STOP:
                 IWL_DEBUG_HT("stop Rx\n");
diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.h b/drivers/net/wireless/iwlwifi/iwl-4965.h
index 9cb82be0ff80..6edf869d4d54 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.h
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.h
@@ -777,7 +777,7 @@ extern void iwl4965_set_ht_add_station(struct iwl4965_priv *priv, u8 index,
                                 struct ieee80211_ht_info *sta_ht_inf);
 extern int iwl4965_mac_ampdu_action(struct ieee80211_hw *hw,
                                     enum ieee80211_ampdu_mlme_action action,
-                                    const u8 *addr, u16 tid, u16 ssn);
+                                    const u8 *addr, u16 tid, u16 *ssn);
 #ifdef CONFIG_IWL4965_HT_AGG
 extern int iwl4965_mac_ht_tx_agg_start(struct ieee80211_hw *hw, u8 *da,
                                    u16 tid, u16 *start_seq_num);
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 9083bafb63ca..3bbc33cc2b96 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -967,10 +967,14 @@ enum ieee80211_filter_flags {
  * &struct ieee80211_ops to indicate which action is needed.
  * @IEEE80211_AMPDU_RX_START: start Rx aggregation
  * @IEEE80211_AMPDU_RX_STOP: stop Rx aggregation
+ * @IEEE80211_AMPDU_TX_START: start Tx aggregation
+ * @IEEE80211_AMPDU_TX_STOP: stop Tx aggregation
  */
 enum ieee80211_ampdu_mlme_action {
         IEEE80211_AMPDU_RX_START,
         IEEE80211_AMPDU_RX_STOP,
+        IEEE80211_AMPDU_TX_START,
+        IEEE80211_AMPDU_TX_STOP,
 };
 
 /**
@@ -1111,7 +1115,8 @@ enum ieee80211_ampdu_mlme_action {
  *      The RA/TID combination determines the destination and TID we want
  *      the ampdu action to be performed for. The action is defined through
  *      ieee80211_ampdu_mlme_action. Starting sequence number (@ssn)
- *      is the first frame we expect to perform the action on.
+ *      is the first frame we expect to perform the action on. notice
+ *      that TX/RX_STOP can pass NULL for this parameter.
  */
 struct ieee80211_ops {
         int (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb,
@@ -1162,7 +1167,7 @@ struct ieee80211_ops {
         int (*conf_ht)(struct ieee80211_hw *hw, struct ieee80211_conf *conf);
         int (*ampdu_action)(struct ieee80211_hw *hw,
                             enum ieee80211_ampdu_mlme_action action,
-                            const u8 *ra, u16 tid, u16 ssn);
+                            const u8 *addr, u16 tid, u16 *ssn);
 };
 
 /**
@@ -1574,4 +1579,81 @@ void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
                                                 struct ieee80211_vif *vif),
                                          void *data);
 
+/**
+ * ieee80211_start_tx_ba_session - Start a tx Block Ack session.
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @ra: receiver address of the BA session recipient
+ * @tid: the TID to BA on.
+ * @return: success if addBA request was sent, failure otherwise
+ *
+ * Although mac80211/low level driver/user space application can estimate
+ * the need to start aggregation on a certain RA/TID, the session level
+ * will be managed by the mac80211.
+ */
+int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid);
+
+/**
+ * ieee80211_start_tx_ba_cb - low level driver ready to aggregate.
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @ra: receiver address of the BA session recipient.
+ * @tid: the TID to BA on.
+ *
+ * This function must be called by low level driver once it has
+ * finished with preparations for the BA session.
+ */
+void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid);
+
+/**
+ * ieee80211_start_tx_ba_cb_irqsafe - low level driver ready to aggregate.
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @ra: receiver address of the BA session recipient.
+ * @tid: the TID to BA on.
+ *
+ * This function must be called by low level driver once it has
+ * finished with preparations for the BA session.
+ * This version of the function is irq safe.
+ */
+void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra,
+                                      u16 tid);
+
+/**
+ * ieee80211_stop_tx_ba_session - Stop a Block Ack session.
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @ra: receiver address of the BA session recipient
+ * @tid: the TID to stop BA.
+ * @initiator: if indicates initiator DELBA frame will be sent.
+ * @return: error if no sta with matching da found, success otherwise
+ *
+ * Although mac80211/low level driver/user space application can estimate
+ * the need to stop aggregation on a certain RA/TID, the session level
+ * will be managed by the mac80211.
+ */
+int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
+                                 u8 *ra, u16 tid,
+                                 enum ieee80211_back_parties initiator);
+
+/**
+ * ieee80211_stop_tx_ba_cb - low level driver ready to stop aggregate.
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @ra: receiver address of the BA session recipient.
+ * @tid: the desired TID to BA on.
+ *
+ * This function must be called by low level driver once it has
+ * finished with preparations for the BA session tear down.
+ */
+void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid);
+
+/**
+ * ieee80211_stop_tx_ba_cb_irqsafe - low level driver ready to stop aggregate.
+ * @hw: pointer as obtained from ieee80211_alloc_hw().
+ * @ra: receiver address of the BA session recipient.
+ * @tid: the desired TID to BA on.
+ *
+ * This function must be called by low level driver once it has
+ * finished with preparations for the BA session tear down.
+ * This version of the function is irq safe.
+ */
+void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra,
+                                     u16 tid);
+
 #endif /* MAC80211_H */
diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index 79dadd2976cd..d5d5610db1bd 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -1128,7 +1128,7 @@ static void ieee80211_sta_process_addba_request(struct net_device *dev,
 
         if (local->ops->ampdu_action)
                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
-                                               sta->addr, tid, start_seq_num);
+                                               sta->addr, tid, &start_seq_num);
 #ifdef CONFIG_MAC80211_HT_DEBUG
         printk(KERN_DEBUG "Rx A-MPDU on tid %d result %d", tid, ret);
 #endif /* CONFIG_MAC80211_HT_DEBUG */
@@ -1230,7 +1230,7 @@ void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
         BUG_ON(!local->ops->ampdu_action);
 
         ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
-                                        ra, tid, EINVAL);
+                                        ra, tid, NULL);
         if (ret)
                 printk(KERN_DEBUG "HW problem - can not stop rx "
                                 "aggergation for tid %d\n", tid);