mt76: mt7915: add .sta_add_debugfs support

This generation supports much more per-peer statistics than legacy ones,
so add .sta_add_debugfs accordingly.

This is convenient to set/get more settings/counters in the long run.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c

@@ -302,3 +302,68 @@ int mt7915_init_debugfs(struct mt7915_dev *dev)
 
 	return 0;
 }
+
+/** per-station debugfs **/
+
+static int
+mt7915_sta_stats_read(struct seq_file *s, void *data)
+{
+	struct ieee80211_sta *sta = s->private;
+	struct mt7915_sta *msta = (struct mt7915_sta *)sta->drv_priv;
+	struct mt7915_sta_stats *stats = &msta->stats;
+	struct rate_info *rate = &stats->prob_rate;
+	static const char * const bw[] = {
+		"BW20", "BW5", "BW10", "BW40",
+		"BW80", "BW160", "BW_HE_RU"
+	};
+
+	if (!rate->legacy && !rate->flags)
+		return 0;
+
+	seq_puts(s, "Probing rate - ");
+	if (rate->flags & RATE_INFO_FLAGS_MCS)
+		seq_puts(s, "HT ");
+	else if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
+		seq_puts(s, "VHT ");
+	else if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
+		seq_puts(s, "HE ");
+	else
+		seq_printf(s, "Bitrate %d\n", rate->legacy);
+
+	if (rate->flags) {
+		seq_printf(s, "%s NSS%d MCS%d ",
+			   bw[rate->bw], rate->nss, rate->mcs);
+
+		if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
+			seq_puts(s, "SGI ");
+		else if (rate->he_gi)
+			seq_puts(s, "HE GI ");
+
+		if (rate->he_dcm)
+			seq_puts(s, "DCM ");
+	}
+
+	seq_printf(s, "\nPPDU PER: %ld.%1ld%%\n",
+		   stats->per / 10, stats->per % 10);
+
+	return 0;
+}
+
+static int
+mt7915_sta_stats_open(struct inode *inode, struct file *f)
+{
+	return single_open(f, mt7915_sta_stats_read, inode->i_private);
+}
+
+static const struct file_operations fops_sta_stats = {
+	.open = mt7915_sta_stats_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+void mt7915_sta_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+			    struct ieee80211_sta *sta, struct dentry *dir)
+{
+	debugfs_create_file("stats", 0400, dir, sta, &fops_sta_stats);
+}

drivers/net/wireless/mediatek/mt76/mt7915/main.c

@@ -746,4 +746,7 @@ const struct ieee80211_ops mt7915_ops = {
 	.get_antenna = mt76_get_antenna,
 	.set_antenna = mt7915_set_antenna,
 	.set_coverage_class = mt7915_set_coverage_class,
+#ifdef CONFIG_MAC80211_DEBUGFS
+	.sta_add_debugfs = mt7915_sta_add_debugfs,
+#endif
 };

drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h

@@ -448,5 +448,9 @@ int mt7915_dfs_init_radar_detector(struct mt7915_phy *phy);
 void mt7915_set_stream_he_caps(struct mt7915_phy *phy);
 void mt7915_update_channel(struct mt76_dev *mdev);
 int mt7915_init_debugfs(struct mt7915_dev *dev);
+#ifdef CONFIG_MAC80211_DEBUGFS
+void mt7915_sta_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+			    struct ieee80211_sta *sta, struct dentry *dir);
+#endif
 
 #endif