mac80211: add support for HE

Add support for HE in mac80211 conforming with P802.11ax_D1.4.

Johannes: Fix another bug with the buf_size comparison in agg-rx.c.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Ido Yariv <idox.yariv@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index 86c6bc0432ba..69e831bc317b 100644
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -463,6 +463,7 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
 		.timeout = 0,
 	};
 	int ret;
+	u16 buf_size;
 
 	tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
 
@@ -511,11 +512,22 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
 	sta->ampdu_mlme.addba_req_num[tid]++;
 	spin_unlock_bh(&sta->lock);
 
+	if (sta->sta.he_cap.has_he) {
+		buf_size = local->hw.max_tx_aggregation_subframes;
+	} else {
+		/*
+		 * We really should use what the driver told us it will
+		 * transmit as the maximum, but certain APs (e.g. the
+		 * LinkSys WRT120N with FW v1.0.07 build 002 Jun 18 2012)
+		 * will crash when we use a lower number.
+		 */
+		buf_size = IEEE80211_MAX_AMPDU_BUF_HT;
+	}
+
 	/* send AddBA request */
 	ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
 				     tid_tx->dialog_token, params.ssn,
-				     IEEE80211_MAX_AMPDU_BUF_HT,
-				     tid_tx->timeout);
+				     buf_size, tid_tx->timeout);
 }
 
 /*
@@ -905,8 +917,7 @@ void ieee80211_process_addba_resp(struct ieee80211_local *local,
 {
 	struct tid_ampdu_tx *tid_tx;
 	struct ieee80211_txq *txq;
-	u16 capab, tid;
-	u8 buf_size;
+	u16 capab, tid, buf_size;
 	bool amsdu;
 
 	capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);