Updated Linux side to check free space first before scheduling Tx when

linux_kernel_modules/mt7697q/interrupt.c

@@ -66,7 +66,7 @@ int mt7697_irq_run(struct mt7697q_info *qinfo)
 			}
 			else {
 				WARN_ON(!qs->notify_tx_fcn);			
-				ret = qs->notify_tx_fcn(qs->priv);
+				ret = qs->notify_tx_fcn(qs->priv, mt7697q_get_free_words(qs));
 				if (ret < 0) {
 					dev_err(qs->qinfo->dev, 
 						"%s(): notify_tx_fcn() failed(%d)\n", 

linux_kernel_modules/mt7697q/queue.c

@@ -52,11 +52,6 @@ static __inline size_t mt7697q_get_num_words(const struct mt7697q_spec *qs)
         	qs->data.rd_offset, qs->data.wr_offset);
 }
 
-static __inline size_t mt7697q_get_free_words(const struct mt7697q_spec *qs)
-{
-    	return mt7697q_get_capacity(qs) - mt7697q_get_num_words(qs);
-}
-
 static int mt7697q_wr_init(u8 tx_ch, u8 rx_ch, struct mt7697q_spec *qs)
 {
 	struct mt7697_queue_init_req req;
@@ -295,6 +290,11 @@ cleanup:
 	return ret;
 }
 
+__inline size_t mt7697q_get_free_words(const struct mt7697q_spec *qs)
+{
+    	return mt7697q_get_capacity(qs) - mt7697q_get_num_words(qs);
+}
+
 int mt7697q_get_s2m_mbx(struct mt7697q_info *qinfo, u8* s2m_mbox)
 {
 	int ret;

linux_kernel_modules/mt7697q/queue.h

@@ -76,6 +76,7 @@ void mt7697_irq_delayed_work(struct work_struct*);
 void mt7697_irq_work(struct work_struct*);
 irqreturn_t mt7697_isr(int, void*);
 
+size_t mt7697q_get_free_words(const struct mt7697q_spec*);
 int mt7697q_proc_data(struct mt7697q_spec*);
 int mt7697q_get_s2m_mbx(struct mt7697q_info*, u8*);
 

linux_kernel_modules/mt7697q/queue_i.h

@@ -75,7 +75,7 @@ struct mt7697_queue_reset_req {
 } __attribute__((packed, aligned(4)));
 
 typedef int (*rx_hndlr)(const struct mt7697q_rsp_hdr*, void*);
-typedef int (*notify_tx_hndlr)(void*);
+typedef int (*notify_tx_hndlr)(void*, u32);
 
 struct mt7697q_if_ops {
 	int (*init)(u8, u8, void*, notify_tx_hndlr, rx_hndlr, void**, void**);

linux_kernel_modules/mt7697wifi/core.h

@@ -80,8 +80,8 @@ enum mt7697_vif_state {
 };
 
 struct mt7697_tx_pkt {
-	struct sk_buff *skb;
 	struct list_head next;
+	struct sk_buff *skb;
 };
 
 struct mt7697_cfg80211_info {
@@ -215,7 +215,7 @@ void mt7697_init_netdev(struct net_device*);
 struct mt7697_vif *mt7697_get_vif_by_idx(struct mt7697_cfg80211_info*, u32);
 struct wireless_dev *mt7697_interface_add(struct mt7697_cfg80211_info*, 
 	const char*, enum nl80211_iftype, u8);
-int mt7697_notify_tx(void*);
+int mt7697_notify_tx(void*, u32);
 void mt7697_tx_work(struct work_struct *);
 int mt7697_data_tx(struct sk_buff*, struct net_device*);
 int mt7697_rx_data(struct mt7697_cfg80211_info*, u32, u32);

linux_kernel_modules/mt7697wifi/txrx.c

@@ -18,18 +18,22 @@
 #include "common.h"
 #include "core.h"
 
-int mt7697_notify_tx(void* priv)
+int mt7697_notify_tx(void* priv, u32 free)
 {
 	struct mt7697_cfg80211_info *cfg = (struct mt7697_cfg80211_info*)priv;
 	int ret = 0;
 
 	spin_lock_bh(&cfg->tx_skb_list_lock);
 	if (!list_empty(&cfg->tx_skb_list)) {
-		ret = queue_work(cfg->tx_workq, &cfg->tx_work);
-		if (ret < 0) {
-			dev_err(cfg->dev, "%s(): queue_work() failed(%d)\n", 
-				__func__, ret);
-			goto cleanup;
+		struct mt7697_tx_pkt *tx_pkt = list_entry(&cfg->tx_skb_list, 
+			struct mt7697_tx_pkt, next);
+		if (tx_pkt->skb->len >= free) {
+			ret = queue_work(cfg->tx_workq, &cfg->tx_work);
+			if (ret < 0) {
+				dev_err(cfg->dev, "%s(): queue_work() failed(%d)\n", 
+					__func__, ret);
+				goto cleanup;
+			}
 		}
 	}