From: Nishant Sarmukadam <nishants@xxxxxxxxxxx>
Queue ADDBA requests in respective data queues to avoid ADDBA
requests and the the related data packets (to the same ra/tid)
queued in the hardware to be sent out asynchronously.
Signed-off-by: Nishant Sarmukadam <nishants@xxxxxxxxxxx>
Signed-off-by: Brian Cavagnolo <brian@xxxxxxxxxxx>
---
drivers/net/wireless/mwl8k.c | 46 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index 5473f4c..ae56d2f 100644
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -1518,6 +1518,33 @@ static int mwl8k_tx_wait_empty(struct ieee80211_hw *hw)
MWL8K_TXD_STATUS_OK_RETRY | \
MWL8K_TXD_STATUS_OK_MORE_RETRY))
+static int mwl8k_tid_queue_mapping(u8 tid)
+{
+ BUG_ON(tid > 7);
+
+ switch (tid) {
+ case 0:
+ case 3:
+ return IEEE80211_AC_BE;
+ break;
+ case 1:
+ case 2:
+ return IEEE80211_AC_BK;
+ break;
+ case 4:
+ case 5:
+ return IEEE80211_AC_VI;
+ break;
+ case 6:
+ case 7:
+ return IEEE80211_AC_VO;
+ break;
+ default:
+ return -1;
+ break;
+ }
+}
+
/* The firmware will fill in the rate information
* for each packet that gets queued in the hardware
* in this structure
@@ -1745,6 +1772,7 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
u8 tid = 0;
struct mwl8k_ampdu_stream *stream = NULL;
bool start_ba_session = false;
+ struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
wh = (struct ieee80211_hdr *)skb->data;
if (ieee80211_is_data_qos(wh->frame_control))
@@ -1788,6 +1816,24 @@ mwl8k_txq_xmit(struct ieee80211_hw *hw, int index, struct sk_buff *skb)
qos |= MWL8K_QOS_ACK_POLICY_NORMAL;
}
+ /* Queue ADDBA request in the respective data queue. While setting up
+ * the ampdu stream, mac80211 queues further packets for that
+ * particular ra/tid pair. However, packets piled up in the hardware
+ * for that ra/tid pair will still go out. ADDBA request and the
+ * related data packets going out from different queues asynchronously
+ * will cause a shift in the receiver window which might result in
+ * ampdu packets getting dropped at the receiver after the stream has
+ * been setup.
+ */
+ if (unlikely(ieee80211_is_action(wh->frame_control) &&
+ mgmt->u.action.category == WLAN_CATEGORY_BACK &&
+ mgmt->u.action.u.addba_req.action_code == WLAN_ACTION_ADDBA_REQ &&
+ priv->ap_fw)) {
+ u16 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
+ tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
+ index = mwl8k_tid_queue_mapping(tid);
+ }
+
txpriority = index;
if (ieee80211_is_data_qos(wh->frame_control) &&
--
1.7.1.1
--
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