mac80211: A-MPDU add debugfs support

This patch adds A-MPDU status report per STA to the debugfs.
The option to de/activate A-MPDU through debugfs is also present.
Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/debugfs_sta.c

@@ -55,6 +55,13 @@ static const struct file_operations sta_ ##name## _ops = {		\
 	.open = mac80211_open_file_generic,				\
 }
 
+#define STA_OPS_WR(name)						\
+static const struct file_operations sta_ ##name## _ops = {		\
+	.read = sta_##name##_read,					\
+	.write = sta_##name##_write,					\
+	.open = mac80211_open_file_generic,				\
+}
+
 #define STA_FILE(name, field, format)					\
 		STA_READ_##format(name, field)				\
 		STA_OPS(name)
@@ -191,6 +198,113 @@ static ssize_t sta_wme_tx_queue_read(struct file *file, char __user *userbuf,
 STA_OPS(wme_tx_queue);
 #endif
 
+static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
+					size_t count, loff_t *ppos)
+{
+	char buf[768], *p = buf;
+	int i;
+	struct sta_info *sta = file->private_data;
+	p += scnprintf(p, sizeof(buf)+buf-p, "Agg state for STA is:\n");
+	p += scnprintf(p, sizeof(buf)+buf-p, " STA next dialog_token is %d \n "
+			"TIDs info is: \n TID :",
+			(sta->ampdu_mlme.dialog_token_allocator + 1));
+	for (i = 0; i < STA_TID_NUM; i++)
+		p += scnprintf(p, sizeof(buf)+buf-p, "%5d", i);
+
+	p += scnprintf(p, sizeof(buf)+buf-p, "\n RX  :");
+	for (i = 0; i < STA_TID_NUM; i++)
+		p += scnprintf(p, sizeof(buf)+buf-p, "%5d",
+	sta->ampdu_mlme.tid_rx[i].state);
+
+	p += scnprintf(p, sizeof(buf)+buf-p, "\n DTKN:");
+	for (i = 0; i < STA_TID_NUM; i++)
+		p += scnprintf(p, sizeof(buf)+buf-p, "%5d",
+			sta->ampdu_mlme.tid_rx[i].dialog_token);
+
+	p += scnprintf(p, sizeof(buf)+buf-p, "\n TX  :");
+	for (i = 0; i < STA_TID_NUM; i++)
+		p += scnprintf(p, sizeof(buf)+buf-p, "%5d",
+			sta->ampdu_mlme.tid_tx[i].state);
+
+	p += scnprintf(p, sizeof(buf)+buf-p, "\n DTKN:");
+	for (i = 0; i < STA_TID_NUM; i++)
+		p += scnprintf(p, sizeof(buf)+buf-p, "%5d",
+			sta->ampdu_mlme.tid_tx[i].dialog_token);
+
+	p += scnprintf(p, sizeof(buf)+buf-p, "\n SSN :");
+	for (i = 0; i < STA_TID_NUM; i++)
+		p += scnprintf(p, sizeof(buf)+buf-p, "%5d",
+			sta->ampdu_mlme.tid_tx[i].ssn);
+
+	p += scnprintf(p, sizeof(buf)+buf-p, "\n");
+
+	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+}
+
+static ssize_t sta_agg_status_write(struct file *file,
+		const char __user *user_buf, size_t count, loff_t *ppos)
+{
+	struct sta_info *sta = file->private_data;
+	struct net_device *dev = sta->dev;
+	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+	struct ieee80211_hw *hw = &local->hw;
+	u8 *da = sta->addr;
+	static int tid_static_tx[16] = {0, 0, 0, 0, 0, 0, 0, 0,
+					0, 0, 0, 0, 0, 0, 0, 0};
+	static int tid_static_rx[16] = {1, 1, 1, 1, 1, 1, 1, 1,
+					1, 1, 1, 1, 1, 1, 1, 1};
+	char *endp;
+	char buf[32];
+	int buf_size, rs;
+	unsigned int tid_num;
+	char state[4];
+
+	memset(buf, 0x00, sizeof(buf));
+	buf_size = min(count, (sizeof(buf)-1));
+	if (copy_from_user(buf, user_buf, buf_size))
+		return -EFAULT;
+
+	tid_num = simple_strtoul(buf, &endp, 0);
+	if (endp == buf)
+		return -EINVAL;
+
+	if ((tid_num >= 100) && (tid_num <= 115)) {
+		/* toggle Rx aggregation command */
+		tid_num = tid_num - 100;
+		if (tid_static_rx[tid_num] == 1) {
+			strcpy(state, "off ");
+			ieee80211_sta_stop_rx_ba_session(dev, da, tid_num, 0,
+					WLAN_REASON_QSTA_REQUIRE_SETUP);
+			sta->ampdu_mlme.tid_rx[tid_num].buf_size = 0xFF;
+			tid_static_rx[tid_num] = 0;
+		} else {
+			strcpy(state, "on ");
+			sta->ampdu_mlme.tid_rx[tid_num].buf_size = 0x00;
+			tid_static_rx[tid_num] = 1;
+		}
+		printk(KERN_DEBUG "debugfs - try switching tid %u %s\n",
+				tid_num, state);
+	} else if ((tid_num >= 0) && (tid_num <= 15)) {
+		/* toggle Tx aggregation command */
+		if (tid_static_tx[tid_num] == 0) {
+			strcpy(state, "on ");
+			rs =  ieee80211_start_tx_ba_session(hw, da, tid_num);
+			if (rs == 0)
+				tid_static_tx[tid_num] = 1;
+		} else {
+			strcpy(state, "off");
+			rs =  ieee80211_stop_tx_ba_session(hw, da, tid_num, 1);
+			if (rs == 0)
+				tid_static_tx[tid_num] = 0;
+		}
+		printk(KERN_DEBUG "debugfs - switching tid %u %s, return=%d\n",
+				tid_num, state, rs);
+	}
+
+	return count;
+}
+STA_OPS_WR(agg_status);
+
 #define DEBUGFS_ADD(name) \
 	sta->debugfs.name = debugfs_create_file(#name, 0444, \
 		sta->debugfs.dir, sta, &sta_ ##name## _ops);
@@ -224,6 +338,7 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta)
 	DEBUGFS_ADD(wme_rx_queue);
 	DEBUGFS_ADD(wme_tx_queue);
 #endif
+	DEBUGFS_ADD(agg_status);
 }
 
 void ieee80211_sta_debugfs_remove(struct sta_info *sta)
@@ -238,6 +353,7 @@ void ieee80211_sta_debugfs_remove(struct sta_info *sta)
 	DEBUGFS_DEL(wme_rx_queue);
 	DEBUGFS_DEL(wme_tx_queue);
 #endif
+	DEBUGFS_DEL(agg_status);
 
 	debugfs_remove(sta->debugfs.dir);
 	sta->debugfs.dir = NULL;

net/mac80211/sta_info.h

@@ -192,6 +192,7 @@ struct sta_info {
 		struct dentry *wme_rx_queue;
 		struct dentry *wme_tx_queue;
 #endif
+		struct dentry *agg_status;
 	} debugfs;
 #endif
 };