mwifiex: correct AMSDU aggregation check

The commit "mwifiex: remove list traversal.."(fcf2176c87..)
wrongly modifies AMSDU aggregation check. Due to this even though
packet size for iperf traffic is already large, we unnecessarily
try to aggregate them which adds some delay. If Tx iperf is started
on UUT for 30 seconds, UUT keeps sending Tx packets for few more
seconds.

That commit is reverted to fix the problem.
Also, MIN_NUM_AMSDU check is moved inside the loop to optimize the
loop.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 25 insertions, 11 deletions

diff --git a/drivers/net/wireless/mwifiex/11n_aggr.c b/drivers/net/wireless/mwifiex/11n_aggr.c
index 1a453a605b3..9e63d16365e 100644
--- a/drivers/net/wireless/mwifiex/11n_aggr.c
+++ b/drivers/net/wireless/mwifiex/11n_aggr.c
@@ -193,7 +193,6 @@ mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
 		skb_src = skb_dequeue(&pra_list->skb_head);
 
 		pra_list->total_pkts_size -= skb_src->len;
-		pra_list->total_pkts--;
 
 		atomic_dec(&priv->wmm.tx_pkts_queued);
 
@@ -269,7 +268,6 @@ mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
 		skb_queue_tail(&pra_list->skb_head, skb_aggr);
 
 		pra_list->total_pkts_size += skb_aggr->len;
-		pra_list->total_pkts++;
 
 		atomic_inc(&priv->wmm.tx_pkts_queued);
 
diff --git a/drivers/net/wireless/mwifiex/11n_aggr.h b/drivers/net/wireless/mwifiex/11n_aggr.h
index 9c6dca7ab02..900e1c62a0c 100644
--- a/drivers/net/wireless/mwifiex/11n_aggr.h
+++ b/drivers/net/wireless/mwifiex/11n_aggr.h
@@ -21,6 +21,7 @@
 #define _MWIFIEX_11N_AGGR_H_
 
 #define PKT_TYPE_AMSDU	0xE6
+#define MIN_NUM_AMSDU 2
 
 int mwifiex_11n_deaggregate_pkt(struct mwifiex_private *priv,
 				struct sk_buff *skb);
diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h
index 4f4042809f2..907ab746dc4 100644
--- a/drivers/net/wireless/mwifiex/main.h
+++ b/drivers/net/wireless/mwifiex/main.h
@@ -173,7 +173,6 @@ struct mwifiex_ra_list_tbl {
 	struct sk_buff_head skb_head;
 	u8 ra[ETH_ALEN];
 	u32 total_pkts_size;
-	u32 total_pkts;
 	u32 is_11n_enabled;
 };
 
diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index 69e260b4171..eda24474c1f 100644
--- a/drivers/net/wireless/mwifiex/wmm.c
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -121,7 +121,6 @@ mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, u8 *ra)
 	memcpy(ra_list->ra, ra, ETH_ALEN);
 
 	ra_list->total_pkts_size = 0;
-	ra_list->total_pkts = 0;
 
 	dev_dbg(adapter->dev, "info: allocated ra_list %p\n", ra_list);
 
@@ -648,7 +647,6 @@ mwifiex_wmm_add_buf_txqueue(struct mwifiex_adapter *adapter,
 	skb_queue_tail(&ra_list->skb_head, skb);
 
 	ra_list->total_pkts_size += skb->len;
-	ra_list->total_pkts++;
 
 	atomic_inc(&priv->wmm.tx_pkts_queued);
 
@@ -975,6 +973,28 @@ mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 }
 
 /*
+ * This function checks if 11n aggregation is possible.
+ */
+static int
+mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
+				    struct mwifiex_ra_list_tbl *ptr,
+				    int max_buf_size)
+{
+	int count = 0, total_size = 0;
+	struct sk_buff *skb, *tmp;
+
+	skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
+		total_size += skb->len;
+		if (total_size >= max_buf_size)
+			break;
+		if (++count >= MIN_NUM_AMSDU)
+			return true;
+	}
+
+	return false;
+}
+
+/*
  * This function sends a single packet to firmware for transmission.
  */
 static void
@@ -1001,7 +1021,6 @@ mwifiex_send_single_packet(struct mwifiex_private *priv,
 	dev_dbg(adapter->dev, "data: dequeuing the packet %p %p\n", ptr, skb);
 
 	ptr->total_pkts_size -= skb->len;
-	ptr->total_pkts--;
 
 	if (!skb_queue_empty(&ptr->skb_head))
 		skb_next = skb_peek(&ptr->skb_head);
@@ -1027,7 +1046,6 @@ mwifiex_send_single_packet(struct mwifiex_private *priv,
 		skb_queue_tail(&ptr->skb_head, skb);
 
 		ptr->total_pkts_size += skb->len;
-		ptr->total_pkts++;
 		tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
 		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
 				       ra_list_flags);
@@ -1213,11 +1231,9 @@ mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
 				mwifiex_send_delba(priv, tid_del, ra, 1);
 			}
 		}
-/* Minimum number of AMSDU */
-#define MIN_NUM_AMSDU 2
-
 		if (mwifiex_is_amsdu_allowed(priv, tid) &&
-				(ptr->total_pkts >= MIN_NUM_AMSDU))
+		    mwifiex_is_11n_aggragation_possible(priv, ptr,
+							adapter->tx_buf_size))
 			mwifiex_11n_aggregate_pkt(priv, ptr, INTF_HEADER_LEN,
 						  ptr_index, flags);
 			/* ra_list_spinlock has been freed in