iwlwifi: refactor TX response flow

This patch utilize 5000 new TX response command
which contains all necessary information and avoids
back referencing to the original TX frame.
It also change handling of software queue tracking
4965 flow is aligned with changes as much as possible.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 20 insertions, 19 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index 6cf4a7c..cfa7826 100644
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -895,9 +895,9 @@ int iwl_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
 		priv->stations[sta_id].tid[tid].tfds_in_queue++;
 	}
 
-	/* Descriptor for chosen Tx queue */
 	txq = &priv->txq[txq_id];
 	q = &txq->q;
+	txq->swq_id = swq_id;
 
 	spin_lock_irqsave(&priv->lock, flags);
 
@@ -1023,7 +1023,7 @@ int iwl_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
 			iwl_txq_update_write_ptr(priv, txq);
 			spin_unlock_irqrestore(&priv->lock, flags);
 		} else {
-			ieee80211_stop_queue(priv->hw, swq_id);
+			ieee80211_stop_queue(priv->hw, txq->swq_id);
 		}
 	}
 
@@ -1395,8 +1395,8 @@ int iwl_txq_check_empty(struct iwl_priv *priv, int sta_id, u8 tid, int txq_id)
 	case IWL_EMPTYING_HW_QUEUE_DELBA:
 		/* We are reclaiming the last packet of the */
 		/* aggregated HW queue */
-		if (txq_id  == tid_data->agg.txq_id &&
-		    q->read_ptr == q->write_ptr) {
+		if ((txq_id  == tid_data->agg.txq_id) &&
+		    (q->read_ptr == q->write_ptr)) {
 			u16 ssn = SEQ_TO_SN(tid_data->seq_number);
 			int tx_fifo = default_tid_to_tx_fifo[tid];
 			IWL_DEBUG_HT("HW queue empty: continue DELBA flow\n");
@@ -1447,7 +1447,7 @@ static int iwl_tx_status_reply_compressed_ba(struct iwl_priv *priv,
 	IWL_DEBUG_TX_REPLY("BA %d %d\n", agg->start_idx, ba_resp->seq_ctl);
 
 	/* Calculate shift to align block-ack bits with our Tx window bits */
-	sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl>>4);
+	sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl >> 4);
 	if (sh < 0) /* tbw something is wrong with indices */
 		sh += 0x100;
 
@@ -1497,9 +1497,11 @@ void iwl_rx_reply_compressed_ba(struct iwl_priv *priv,
 {
 	struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
 	struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
-	int index;
 	struct iwl_tx_queue *txq = NULL;
 	struct iwl_ht_agg *agg;
+	int index;
+	int sta_id;
+	int tid;
 
 	/* "flow" corresponds to Tx queue */
 	u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
@@ -1514,14 +1516,16 @@ void iwl_rx_reply_compressed_ba(struct iwl_priv *priv,
 	}
 
 	txq = &priv->txq[scd_flow];
-	agg = &priv->stations[ba_resp->sta_id].tid[ba_resp->tid].agg;
+	sta_id = ba_resp->sta_id;
+	tid = ba_resp->tid;
+	agg = &priv->stations[sta_id].tid[tid].agg;
 
 	/* Find index just before block-ack window */
 	index = iwl_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);
 
 	/* TODO: Need to get this copy more safely - now good for debug */
 
-	IWL_DEBUG_TX_REPLY("REPLY_COMPRESSED_BA [%d]Received from %pM, "
+	IWL_DEBUG_TX_REPLY("REPLY_COMPRESSED_BA [%d] Received from %pM, "
 			   "sta_id = %d\n",
 			   agg->wait_for_ba,
 			   (u8 *) &ba_resp->sta_addr_lo32,
@@ -1545,18 +1549,15 @@ void iwl_rx_reply_compressed_ba(struct iwl_priv *priv,
 	 * transmitted ... if not, it's too late anyway). */
 	if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) {
 		/* calculate mac80211 ampdu sw queue to wake */
-		int ampdu_q =
-		   scd_flow - priv->hw_params.first_ampdu_q + priv->hw->queues;
 		int freed = iwl_tx_queue_reclaim(priv, scd_flow, index);
-		priv->stations[ba_resp->sta_id].
-			tid[ba_resp->tid].tfds_in_queue -= freed;
-		if (iwl_queue_space(&txq->q) > txq->q.low_mark &&
-			priv->mac80211_registered &&
-			agg->state != IWL_EMPTYING_HW_QUEUE_DELBA)
-			ieee80211_wake_queue(priv->hw, ampdu_q);
-
-		iwl_txq_check_empty(priv, ba_resp->sta_id,
-				    ba_resp->tid, scd_flow);
+		priv->stations[sta_id].tid[tid].tfds_in_queue -= freed;
+
+		if ((iwl_queue_space(&txq->q) > txq->q.low_mark) &&
+		    priv->mac80211_registered &&
+		    (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA))
+			ieee80211_wake_queue(priv->hw, txq->swq_id);
+
+		iwl_txq_check_empty(priv, sta_id, tid, scd_flow);
 	}
 }
 EXPORT_SYMBOL(iwl_rx_reply_compressed_ba);