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>

1 files changed, 84 insertions, 2 deletions

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 */