mt76: mt7915: set peer Tx fixed rate through debugfs

Driver can manually set fixed rate for each peer through debugfs.

May use .set_bitrate_mask callback and iterate stations under the
current vif to achieve the aim once it supports HE rate.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -305,6 +305,18 @@ int mt7915_init_debugfs(struct mt7915_dev *dev)
 
 /** per-station debugfs **/
 
+/* usage: <tx mode> <ldpc> <stbc> <bw> <gi> <nss> <mcs> */
+static int mt7915_sta_fixed_rate_set(void *data, u64 rate)
+{
+	struct ieee80211_sta *sta = data;
+	struct mt7915_sta *msta = (struct mt7915_sta *)sta->drv_priv;
+
+	return mt7915_mcu_set_fixed_rate(msta->vif->dev, sta, rate);
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_fixed_rate, NULL,
+			 mt7915_sta_fixed_rate_set, "%llx\n");
+
 static int
 mt7915_sta_stats_read(struct seq_file *s, void *data)
 {
@@ -365,5 +377,6 @@ static const struct file_operations fops_sta_stats = {
 void mt7915_sta_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 			    struct ieee80211_sta *sta, struct dentry *dir)
 {
+	debugfs_create_file("fixed_rate", 0600, dir, sta, &fops_fixed_rate);
 	debugfs_create_file("stats", 0400, dir, sta, &fops_sta_stats);
 }

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

@@ -1735,6 +1735,52 @@ int mt7915_mcu_add_sta(struct mt7915_dev *dev, struct ieee80211_vif *vif,
 	return 0;
 }
 
+int mt7915_mcu_set_fixed_rate(struct mt7915_dev *dev,
+			      struct ieee80211_sta *sta, u32 rate)
+{
+	struct mt7915_sta *msta = (struct mt7915_sta *)sta->drv_priv;
+	struct mt7915_vif *mvif = msta->vif;
+	struct sta_rec_ra_fixed *ra;
+	struct sk_buff *skb;
+	struct tlv *tlv;
+
+	skb = mt7915_mcu_alloc_sta_req(dev, mvif, msta,
+				       MT7915_STA_UPDATE_MAX_SIZE);
+	if (IS_ERR(skb))
+		return PTR_ERR(skb);
+
+	tlv = mt7915_mcu_add_tlv(skb, STA_REC_RA_UPDATE, sizeof(*ra));
+	ra = (struct sta_rec_ra_fixed *)tlv;
+
+	if (!rate) {
+		ra->field = cpu_to_le32(RATE_PARAM_AUTO);
+		goto out;
+	} else {
+		ra->field = cpu_to_le32(RATE_PARAM_FIXED);
+	}
+
+	ra->phy.type = FIELD_GET(RATE_CFG_PHY_TYPE, rate);
+	ra->phy.bw = FIELD_GET(RATE_CFG_BW, rate);
+	ra->phy.nss = FIELD_GET(RATE_CFG_NSS, rate);
+	ra->phy.mcs = FIELD_GET(RATE_CFG_MCS, rate);
+	ra->phy.stbc = FIELD_GET(RATE_CFG_STBC, rate);
+
+	if (ra->phy.bw)
+		ra->phy.ldpc = 7;
+	else
+		ra->phy.ldpc = FIELD_GET(RATE_CFG_LDPC, rate) * 7;
+
+	/* HT/VHT - SGI: 1, LGI: 0; HE - SGI: 0, MGI: 1, LGI: 2 */
+	if (ra->phy.type > MT_PHY_TYPE_VHT)
+		ra->phy.sgi = ra->phy.mcs * 85;
+	else
+		ra->phy.sgi = ra->phy.mcs * 15;
+
+out:
+	return __mt76_mcu_skb_send_msg(&dev->mt76, skb,
+				       MCU_EXT_CMD_STA_REC_UPDATE, true);
+}
+
 int mt7915_mcu_add_dev_info(struct mt7915_dev *dev,
 			    struct ieee80211_vif *vif, bool enable)
 {

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

@@ -803,6 +803,34 @@ struct sta_rec_ra {
 	struct ra_phy phy;
 } __packed;
 
+struct sta_rec_ra_fixed {
+	__le16 tag;
+	__le16 len;
+
+	__le32 field;
+	u8 op_mode;
+	u8 op_vht_chan_width;
+	u8 op_vht_rx_nss;
+	u8 op_vht_rx_nss_type;
+
+	struct ra_phy phy;
+
+	u8 spe_en;
+	u8 short_preamble;
+	u8 is_5g;
+	u8 mmps_mode;
+} __packed;
+
+#define RATE_PARAM_FIXED		3
+#define RATE_PARAM_AUTO			20
+#define RATE_CFG_MCS			GENMASK(3, 0)
+#define RATE_CFG_NSS			GENMASK(7, 4)
+#define RATE_CFG_GI			GENMASK(11, 8)
+#define RATE_CFG_BW			GENMASK(15, 12)
+#define RATE_CFG_STBC			GENMASK(19, 16)
+#define RATE_CFG_LDPC			GENMASK(23, 20)
+#define RATE_CFG_PHY_TYPE		GENMASK(27, 24)
+
 enum {
 	STA_REC_BASIC,
 	STA_REC_RA,

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

@@ -303,6 +303,8 @@ int mt7915_mcu_add_smps(struct mt7915_dev *dev, struct ieee80211_vif *vif,
 			struct ieee80211_sta *sta);
 int mt7915_mcu_set_chan_info(struct mt7915_phy *phy, int cmd);
 int mt7915_mcu_set_tx(struct mt7915_dev *dev, struct ieee80211_vif *vif);
+int mt7915_mcu_set_fixed_rate(struct mt7915_dev *dev,
+			      struct ieee80211_sta *sta, u32 rate);
 int mt7915_mcu_set_eeprom(struct mt7915_dev *dev);
 int mt7915_mcu_get_eeprom(struct mt7915_dev *dev, u32 offset);
 int mt7915_mcu_set_mac(struct mt7915_dev *dev, int band, bool enable,