package/backports-custom/backports-custom-0522-ath10k-fix-rx-aggregation-reordering.patch

Firmware doesn't perform Rx reordering so it is
left to the host driver to do that.

Use mac80211 to perform reordering instead of
re-inventing the wheel.

This fixes TCP throughput issues in some
environments.

Reported-by: Denton Gentry <denton.gentry@xxxxxxxxx>
Signed-off-by: Michal Kazior <michal.kazior@xxxxxxxxx>
---
This depends on:

 * mac80211: fix Rx reordering with RX_FLAG_AMSDU_MORE
 * mac80211: add support for Rx reordering offloading

I'm still seeing some issues with TCP traffic.
Apparently firmware/hardware sometimes stalls Rx
for ~100ms and misses some aggregate frames. I
wasn't able to pinpoint what the problem is. The
more parallel TCP streams (iperf) the more often
stalls happen. UDP doesn't seem to trigger the Rx
stalls at all.


Notes:
    v4:
     * return immediatelly instead break [Varka]
     * fix endianess conversion (__le32 -> __le16)
     * use rx_delba in delba callback
    
    v3:
     * make ath10k_ampdu_action() static
    
    v2:
     * split addba/delba handling into separate functions [Kalle]
     * extend ampdu_action debug print (+vdev_id, +sta addr, +tid)

 drivers/net/wireless/ath/ath10k/htt_rx.c | 92 +++++++++++++++++++++++++++++++-
 drivers/net/wireless/ath/ath10k/mac.c    | 33 ++++++++++++
 drivers/net/wireless/ath/ath10k/txrx.c   |  3 +-
 drivers/net/wireless/ath/ath10k/txrx.h   |  1 +
 4 files changed, 126 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
index 318efc3..77cdc21 100644
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -21,6 +21,7 @@
 #include "txrx.h"
 #include "debug.h"
 #include "trace.h"
+#include "mac.h"
 
 #include <linux/log2.h>
 
@@ -1422,6 +1423,86 @@ static void ath10k_htt_rx_frm_tx_compl(struct ath10k *ar,
 	}
 }
 
+static void ath10k_htt_rx_addba(struct ath10k *ar, struct htt_resp *resp)
+{
+	struct htt_rx_addba *ev = &resp->rx_addba;
+	struct ath10k_peer *peer;
+	struct ath10k_vif *arvif;
+	u16 info0, tid, peer_id;
+
+	info0 = __le16_to_cpu(ev->info0);
+	tid = MS(info0, HTT_RX_BA_INFO0_TID);
+	peer_id = MS(info0, HTT_RX_BA_INFO0_PEER_ID);
+
+	ath10k_dbg(ATH10K_DBG_HTT,
+		   "htt rx addba tid %hu peer_id %hu size %hhu\n",
+		   tid, peer_id, ev->window_size);
+
+	spin_lock_bh(&ar->data_lock);
+	peer = ath10k_peer_find_by_id(ar, peer_id);
+	if (!peer) {
+		ath10k_warn("received addba event for invalid peer_id: %hu\n",
+			    peer_id);
+		spin_unlock_bh(&ar->data_lock);
+		return;
+	}
+
+	arvif = ath10k_get_arvif(ar, peer->vdev_id);
+	if (!arvif) {
+		ath10k_warn("received addba event for invalid vdev_id: %u\n",
+			    peer->vdev_id);
+		spin_unlock_bh(&ar->data_lock);
+		return;
+	}
+
+	ath10k_dbg(ATH10K_DBG_HTT,
+		   "htt rx start rx ba session sta %pM tid %hu size %hhu\n",
+		   peer->addr, tid, ev->window_size);
+
+	ieee80211_start_rx_ba_session_offl(arvif->vif, peer->addr, tid);
+	spin_unlock_bh(&ar->data_lock);
+}
+
+static void ath10k_htt_rx_delba(struct ath10k *ar, struct htt_resp *resp)
+{
+	struct htt_rx_delba *ev = &resp->rx_delba;
+	struct ath10k_peer *peer;
+	struct ath10k_vif *arvif;
+	u16 info0, tid, peer_id;
+
+	info0 = __le16_to_cpu(ev->info0);
+	tid = MS(info0, HTT_RX_BA_INFO0_TID);
+	peer_id = MS(info0, HTT_RX_BA_INFO0_PEER_ID);
+
+	ath10k_dbg(ATH10K_DBG_HTT,
+		   "htt rx delba tid %hu peer_id %hu\n",
+		   tid, peer_id);
+
+	spin_lock_bh(&ar->data_lock);
+	peer = ath10k_peer_find_by_id(ar, peer_id);
+	if (!peer) {
+		ath10k_warn("received addba event for invalid peer_id: %hu\n",
+			    peer_id);
+		spin_unlock_bh(&ar->data_lock);
+		return;
+	}
+
+	arvif = ath10k_get_arvif(ar, peer->vdev_id);
+	if (!arvif) {
+		ath10k_warn("received addba event for invalid vdev_id: %u\n",
+			    peer->vdev_id);
+		spin_unlock_bh(&ar->data_lock);
+		return;
+	}
+
+	ath10k_dbg(ATH10K_DBG_HTT,
+		   "htt rx stop rx ba session sta %pM tid %hu\n",
+		   peer->addr, tid);
+
+	ieee80211_stop_rx_ba_session_offl(arvif->vif, peer->addr, tid);
+	spin_unlock_bh(&ar->data_lock);
+}
+
 void ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
 {
 	struct ath10k_htt *htt = &ar->htt;
@@ -1524,8 +1605,17 @@ void ath10k_htt_t2h_msg_handler(struct ath10k *ar, struct sk_buff *skb)
 		ath10k_warn("received an unexpected htt tx inspect event\n");
 		break;
 	case HTT_T2H_MSG_TYPE_RX_ADDBA:
+		ath10k_htt_rx_addba(ar, resp);
+		break;
 	case HTT_T2H_MSG_TYPE_RX_DELBA:
-	case HTT_T2H_MSG_TYPE_RX_FLUSH:
+		ath10k_htt_rx_delba(ar, resp);
+		break;
+	case HTT_T2H_MSG_TYPE_RX_FLUSH: {
+		/* Ignore this event because mac80211 takes care of Rx
+		 * aggregation reordering.
+		 */
+		break;
+	}
 	default:
 		ath10k_dbg(ATH10K_DBG_HTT, "htt event (%d) not handled\n",
 			   resp->hdr.msg_type);
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 3f9afaa..3baa229 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -4333,6 +4333,38 @@ static u64 ath10k_get_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 	return 0;
 }
 
+static int ath10k_ampdu_action(struct ieee80211_hw *hw,
+			       struct ieee80211_vif *vif,
+			       enum ieee80211_ampdu_mlme_action action,
+			       struct ieee80211_sta *sta, u16 tid, u16 *ssn,
+			       u8 buf_size)
+{
+	struct ath10k_vif *arvif = ath10k_vif_to_arvif(vif);
+
+	ath10k_dbg(ATH10K_DBG_MAC, "mac ampdu vdev_id %i sta %pM tid %hu action %d\n",
+		   arvif->vdev_id, sta->addr, tid, action);
+
+	switch (action) {
+	case IEEE80211_AMPDU_RX_START:
+	case IEEE80211_AMPDU_RX_STOP:
+		/* HTT AddBa/DelBa events trigger mac80211 Rx BA session
+		 * creation/removal. Do we need to verify this?
+		 */
+		return 0;
+	case IEEE80211_AMPDU_TX_START:
+	case IEEE80211_AMPDU_TX_STOP_CONT:
+	case IEEE80211_AMPDU_TX_STOP_FLUSH:
+	case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
+	case IEEE80211_AMPDU_TX_OPERATIONAL:
+		/* Firmware offloads Tx aggregation entirely so deny mac80211
+		 * Tx aggregation requests.
+		 */
+		return -EOPNOTSUPP;
+	}
+
+	return -EINVAL;
+}
+
 static const struct ieee80211_ops ath10k_ops = {
 	.tx				= ath10k_tx,
 	.start				= ath10k_start,
@@ -4360,6 +4392,7 @@ static const struct ieee80211_ops ath10k_ops = {
 	.set_bitrate_mask		= ath10k_set_bitrate_mask,
 	.sta_rc_update			= ath10k_sta_rc_update,
 	.get_tsf			= ath10k_get_tsf,
+	.ampdu_action			= ath10k_ampdu_action,
 #ifdef CONFIG_PM
 	.suspend			= ath10k_suspend,
 	.resume				= ath10k_resume,
diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c
index 82669a7..f4fa22d 100644
--- a/drivers/net/wireless/ath/ath10k/txrx.c
+++ b/drivers/net/wireless/ath/ath10k/txrx.c
@@ -119,8 +119,7 @@ struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
 	return NULL;
 }
 
-static struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar,
-						  int peer_id)
+struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar, int peer_id)
 {
 	struct ath10k_peer *peer;
 
diff --git a/drivers/net/wireless/ath/ath10k/txrx.h b/drivers/net/wireless/ath/ath10k/txrx.h
index aee3e20..a90e09f 100644
--- a/drivers/net/wireless/ath/ath10k/txrx.h
+++ b/drivers/net/wireless/ath/ath10k/txrx.h
@@ -24,6 +24,7 @@ void ath10k_txrx_tx_unref(struct ath10k_htt *htt,
 
 struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
 				     const u8 *addr);
+struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar, int peer_id);
 int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id,
 				 const u8 *addr);
 int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id,
-- 
1.8.5.3