mwifiex: add 11n Block Ack support for uAP

This patch adds support for handling BA request and BA setup
events for AP interface.

RA list is marked as either 11n enabled or disabled from station's
capabilities in association request. BA setup is initiated only
after some specific number of packets for particular RA list are
transmitted.

Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 54 insertions, 5 deletions

diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index 3fa4d4176993..8ccd6999fa9f 100644
--- a/drivers/net/wireless/mwifiex/wmm.c
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -127,6 +127,29 @@ mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, u8 *ra)
 	return ra_list;
 }
 
+/* This function returns random no between 16 and 32 to be used as threshold
+ * for no of packets after which BA setup is initiated.
+ */
+static u8 mwifiex_get_random_ba_threshold(void)
+{
+	u32 sec, usec;
+	struct timeval ba_tstamp;
+	u8 ba_threshold;
+
+	/* setup ba_packet_threshold here random number between
+	 * [BA_SETUP_PACKET_OFFSET,
+	 * BA_SETUP_PACKET_OFFSET+BA_SETUP_MAX_PACKET_THRESHOLD-1]
+	 */
+
+	do_gettimeofday(&ba_tstamp);
+	sec = (ba_tstamp.tv_sec & 0xFFFF) + (ba_tstamp.tv_sec >> 16);
+	usec = (ba_tstamp.tv_usec & 0xFFFF) + (ba_tstamp.tv_usec >> 16);
+	ba_threshold = (((sec << 16) + usec) % BA_SETUP_MAX_PACKET_THRESHOLD)
+						      + BA_SETUP_PACKET_OFFSET;
+
+	return ba_threshold;
+}
+
 /*
  * This function allocates and adds a RA list for all TIDs
  * with the given RA.
@@ -137,6 +160,12 @@ mwifiex_ralist_add(struct mwifiex_private *priv, u8 *ra)
 	int i;
 	struct mwifiex_ra_list_tbl *ra_list;
 	struct mwifiex_adapter *adapter = priv->adapter;
+	struct mwifiex_sta_node *node;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->sta_list_spinlock, flags);
+	node = mwifiex_get_sta_entry(priv, ra);
+	spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 
 	for (i = 0; i < MAX_NUM_TID; ++i) {
 		ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
@@ -145,14 +174,24 @@ mwifiex_ralist_add(struct mwifiex_private *priv, u8 *ra)
 		if (!ra_list)
 			break;
 
-		if (!mwifiex_queuing_ra_based(priv))
+		ra_list->is_11n_enabled = 0;
+		if (!mwifiex_queuing_ra_based(priv)) {
 			ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
-		else
-			ra_list->is_11n_enabled = false;
+		} else {
+			ra_list->is_11n_enabled =
+				      mwifiex_is_sta_11n_enabled(priv, node);
+			if (ra_list->is_11n_enabled)
+				ra_list->max_amsdu = node->max_amsdu;
+		}
 
 		dev_dbg(adapter->dev, "data: ralist %p: is_11n_enabled=%d\n",
 			ra_list, ra_list->is_11n_enabled);
 
+		if (ra_list->is_11n_enabled) {
+			ra_list->pkt_count = 0;
+			ra_list->ba_packet_thr =
+					      mwifiex_get_random_ba_threshold();
+		}
 		list_add_tail(&ra_list->list,
 			      &priv->wmm.tid_tbl_ptr[i].ra_list);
 
@@ -647,6 +686,7 @@ mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 	skb_queue_tail(&ra_list->skb_head, skb);
 
 	ra_list->total_pkts_size += skb->len;
+	ra_list->pkt_count++;
 
 	atomic_inc(&priv->wmm.tx_pkts_queued);
 
@@ -986,10 +1026,17 @@ mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
 {
 	int count = 0, total_size = 0;
 	struct sk_buff *skb, *tmp;
+	int max_amsdu_size;
+
+	if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
+	    ptr->is_11n_enabled)
+		max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
+	else
+		max_amsdu_size = max_buf_size;
 
 	skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
 		total_size += skb->len;
-		if (total_size >= max_buf_size)
+		if (total_size >= max_amsdu_size)
 			break;
 		if (++count >= MIN_NUM_AMSDU)
 			return true;
@@ -1050,6 +1097,7 @@ mwifiex_send_single_packet(struct mwifiex_private *priv,
 		skb_queue_tail(&ptr->skb_head, skb);
 
 		ptr->total_pkts_size += skb->len;
+		ptr->pkt_count++;
 		tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
 		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 				       ra_list_flags);
@@ -1231,7 +1279,8 @@ mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
 		/* ra_list_spinlock has been freed in
 		   mwifiex_send_single_packet() */
 	} else {
-		if (mwifiex_is_ampdu_allowed(priv, tid)) {
+		if (mwifiex_is_ampdu_allowed(priv, tid) &&
+		    ptr->pkt_count > ptr->ba_packet_thr) {
 			if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
 				mwifiex_create_ba_tbl(priv, ptr->ra, tid,
 						      BA_SETUP_INPROGRESS);