ath10k: add bitrate parse for peer stats info

The rate code and rate kbps report by WMI_TLV_PEER_STATS_INFO_EVENTID
from firmware contains all the bitrate info which include OFDM, CCK,
HT/VHT, and mac80211 need the struct rate_info which include below
parameters:

flags: bitflag of flags from &enum rate_info_flags
mcs: mcs index if struct describes an HT/VHT/HE rate
legacy: bitrate in 100kbit/s for 802.11abg
nss: number of streams (VHT & HE only)
bw: bandwidth (from &enum rate_info_bw)

For OFDM/CCK, its rate kbps indicate the bitrate, for HT/VHT, mac80211
need the above 5 parameters to cacluate the bitrate and show by iw.

After parse the bitrate info, iw show the correct rx bitrate:

localhost ~ # iw wlan0 link
	rx bitrate: 234.0 MBit/s VHT-MCS 3 80MHz VHT-NSS 2
	rx bitrate: 40.5 MBit/s MCS 2 40MHz
	rx bitrate: 72.2 MBit/s MCS 7 short GI
	rx bitrate: 54.0 MBit/s
	rx bitrate: 48.0 MBit/s

Tested with QCA6174 SDIO with firmware WLAN.RMH.4.4.1-00042.
Signed-off-by: Wen Gong <wgong@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200427080416.8265-4-wgong@codeaurora.org

drivers/net/wireless/ath/ath10k/core.h

@@ -149,6 +149,26 @@ static inline u32 host_interest_item_address(u32 item_offset)
 	return QCA988X_HOST_INTEREST_ADDRESS + item_offset;
 }
 
+enum ath10k_phy_mode {
+	ATH10K_PHY_MODE_LEGACY = 0,
+	ATH10K_PHY_MODE_HT = 1,
+	ATH10K_PHY_MODE_VHT = 2,
+};
+
+/* Data rate 100KBPS based on IE Index */
+struct ath10k_index_ht_data_rate_type {
+	u8   beacon_rate_index;
+	u16  supported_rate[4];
+};
+
+/* Data rate 100KBPS based on IE Index */
+struct ath10k_index_vht_data_rate_type {
+	u8   beacon_rate_index;
+	u16  supported_VHT80_rate[2];
+	u16  supported_VHT40_rate[2];
+	u16  supported_VHT20_rate[2];
+};
+
 struct ath10k_bmi {
 	bool done_sent;
 };

drivers/net/wireless/ath/ath10k/mac.c

@@ -8305,6 +8305,157 @@ static void ath10k_mac_op_sta_pre_rcu_remove(struct ieee80211_hw *hw,
 			peer->removed = true;
 }
 
+/* HT MCS parameters with Nss = 1 */
+static const struct ath10k_index_ht_data_rate_type supported_ht_mcs_rate_nss1[] = {
+	/* MCS  L20   L40   S20  S40 */
+	{0,  { 65,  135,  72,  150} },
+	{1,  { 130, 270,  144, 300} },
+	{2,  { 195, 405,  217, 450} },
+	{3,  { 260, 540,  289, 600} },
+	{4,  { 390, 810,  433, 900} },
+	{5,  { 520, 1080, 578, 1200} },
+	{6,  { 585, 1215, 650, 1350} },
+	{7,  { 650, 1350, 722, 1500} }
+};
+
+/* HT MCS parameters with Nss = 2 */
+static const struct ath10k_index_ht_data_rate_type supported_ht_mcs_rate_nss2[] = {
+	/* MCS  L20    L40   S20   S40 */
+	{0,  {130,  270,  144,  300} },
+	{1,  {260,  540,  289,  600} },
+	{2,  {390,  810,  433,  900} },
+	{3,  {520,  1080, 578,  1200} },
+	{4,  {780,  1620, 867,  1800} },
+	{5,  {1040, 2160, 1156, 2400} },
+	{6,  {1170, 2430, 1300, 2700} },
+	{7,  {1300, 2700, 1444, 3000} }
+};
+
+/* MCS parameters with Nss = 1 */
+static const struct ath10k_index_vht_data_rate_type supported_vht_mcs_rate_nss1[] = {
+	/* MCS  L80    S80     L40   S40    L20   S20 */
+	{0,  {293,  325},  {135,  150},  {65,   72} },
+	{1,  {585,  650},  {270,  300},  {130,  144} },
+	{2,  {878,  975},  {405,  450},  {195,  217} },
+	{3,  {1170, 1300}, {540,  600},  {260,  289} },
+	{4,  {1755, 1950}, {810,  900},  {390,  433} },
+	{5,  {2340, 2600}, {1080, 1200}, {520,  578} },
+	{6,  {2633, 2925}, {1215, 1350}, {585,  650} },
+	{7,  {2925, 3250}, {1350, 1500}, {650,  722} },
+	{8,  {3510, 3900}, {1620, 1800}, {780,  867} },
+	{9,  {3900, 4333}, {1800, 2000}, {780,  867} }
+};
+
+/*MCS parameters with Nss = 2 */
+static const struct ath10k_index_vht_data_rate_type supported_vht_mcs_rate_nss2[] = {
+	/* MCS  L80    S80     L40   S40    L20   S20 */
+	{0,  {585,  650},  {270,  300},  {130,  144} },
+	{1,  {1170, 1300}, {540,  600},  {260,  289} },
+	{2,  {1755, 1950}, {810,  900},  {390,  433} },
+	{3,  {2340, 2600}, {1080, 1200}, {520,  578} },
+	{4,  {3510, 3900}, {1620, 1800}, {780,  867} },
+	{5,  {4680, 5200}, {2160, 2400}, {1040, 1156} },
+	{6,  {5265, 5850}, {2430, 2700}, {1170, 1300} },
+	{7,  {5850, 6500}, {2700, 3000}, {1300, 1444} },
+	{8,  {7020, 7800}, {3240, 3600}, {1560, 1733} },
+	{9,  {7800, 8667}, {3600, 4000}, {1560, 1733} }
+};
+
+static void ath10k_mac_get_rate_flags_ht(struct ath10k *ar, u32 rate, u8 nss, u8 mcs,
+					 u8 *flags, u8 *bw)
+{
+	struct ath10k_index_ht_data_rate_type *mcs_rate;
+
+	mcs_rate = (struct ath10k_index_ht_data_rate_type *)
+		   ((nss == 1) ? &supported_ht_mcs_rate_nss1 :
+		   &supported_ht_mcs_rate_nss2);
+
+	if (rate == mcs_rate[mcs].supported_rate[0]) {
+		*bw = RATE_INFO_BW_20;
+	} else if (rate == mcs_rate[mcs].supported_rate[1]) {
+		*bw |= RATE_INFO_BW_40;
+	} else if (rate == mcs_rate[mcs].supported_rate[2]) {
+		*bw |= RATE_INFO_BW_20;
+		*flags |= RATE_INFO_FLAGS_SHORT_GI;
+	} else if (rate == mcs_rate[mcs].supported_rate[3]) {
+		*bw |= RATE_INFO_BW_40;
+		*flags |= RATE_INFO_FLAGS_SHORT_GI;
+	} else {
+		ath10k_warn(ar, "invalid ht params rate %d 100kbps nss %d mcs %d",
+			    rate, nss, mcs);
+	}
+}
+
+static void ath10k_mac_get_rate_flags_vht(struct ath10k *ar, u32 rate, u8 nss, u8 mcs,
+					  u8 *flags, u8 *bw)
+{
+	struct ath10k_index_vht_data_rate_type *mcs_rate;
+
+	mcs_rate = (struct ath10k_index_vht_data_rate_type *)
+		   ((nss == 1) ? &supported_vht_mcs_rate_nss1 :
+		   &supported_vht_mcs_rate_nss2);
+
+	if (rate == mcs_rate[mcs].supported_VHT80_rate[0]) {
+		*bw = RATE_INFO_BW_80;
+	} else if (rate == mcs_rate[mcs].supported_VHT80_rate[1]) {
+		*bw = RATE_INFO_BW_80;
+		*flags |= RATE_INFO_FLAGS_SHORT_GI;
+	} else if (rate == mcs_rate[mcs].supported_VHT40_rate[0]) {
+		*bw = RATE_INFO_BW_40;
+	} else if (rate == mcs_rate[mcs].supported_VHT40_rate[1]) {
+		*bw = RATE_INFO_BW_40;
+		*flags |= RATE_INFO_FLAGS_SHORT_GI;
+	} else if (rate == mcs_rate[mcs].supported_VHT20_rate[0]) {
+		*bw = RATE_INFO_BW_20;
+	} else if (rate == mcs_rate[mcs].supported_VHT20_rate[1]) {
+		*bw = RATE_INFO_BW_20;
+		*flags |= RATE_INFO_FLAGS_SHORT_GI;
+	} else {
+		ath10k_warn(ar, "invalid vht params rate %d 100kbps nss %d mcs %d",
+			    rate, nss, mcs);
+	}
+}
+
+static void ath10k_mac_get_rate_flags(struct ath10k *ar, u32 rate,
+				      enum ath10k_phy_mode mode, u8 nss, u8 mcs,
+				      u8 *flags, u8 *bw)
+{
+	if (mode == ATH10K_PHY_MODE_HT) {
+		*flags = RATE_INFO_FLAGS_MCS;
+		ath10k_mac_get_rate_flags_ht(ar, rate, nss, mcs, flags, bw);
+	} else if (mode == ATH10K_PHY_MODE_VHT) {
+		*flags = RATE_INFO_FLAGS_VHT_MCS;
+		ath10k_mac_get_rate_flags_vht(ar, rate, nss, mcs, flags, bw);
+	}
+}
+
+static void ath10k_mac_parse_bitrate(struct ath10k *ar, u32 rate_code,
+				     u32 bitrate_kbps, struct rate_info *rate)
+{
+	enum ath10k_phy_mode mode = ATH10K_PHY_MODE_LEGACY;
+	enum wmi_rate_preamble preamble = WMI_TLV_GET_HW_RC_PREAM_V1(rate_code);
+	u8 nss = WMI_TLV_GET_HW_RC_NSS_V1(rate_code) + 1;
+	u8 mcs = WMI_TLV_GET_HW_RC_RATE_V1(rate_code);
+	u8 flags = 0, bw = 0;
+
+	if (preamble == WMI_RATE_PREAMBLE_HT)
+		mode = ATH10K_PHY_MODE_HT;
+	else if (preamble == WMI_RATE_PREAMBLE_VHT)
+		mode = ATH10K_PHY_MODE_VHT;
+
+	ath10k_mac_get_rate_flags(ar, bitrate_kbps / 100, mode, nss, mcs, &flags, &bw);
+
+	ath10k_dbg(ar, ATH10K_DBG_MAC,
+		   "mac parse bitrate preamble %d mode %d nss %d mcs %d flags %x bw %d\n",
+		   preamble, mode, nss, mcs, flags, bw);
+
+	rate->flags = flags;
+	rate->bw = bw;
+	rate->legacy = bitrate_kbps / 100;
+	rate->nss = nss;
+	rate->mcs = mcs;
+}
+
 static void ath10k_mac_sta_get_peer_stats_info(struct ath10k *ar,
 					       struct ieee80211_sta *sta,
 					       struct station_info *sinfo)
@@ -8341,6 +8492,16 @@ static void ath10k_mac_sta_get_peer_stats_info(struct ath10k *ar,
 		ath10k_warn(ar, "timed out waiting peer stats info\n");
 		return;
 	}
+
+	if (arsta->rx_rate_code != 0 && arsta->rx_bitrate_kbps != 0) {
+		ath10k_mac_parse_bitrate(ar, arsta->rx_rate_code,
+					 arsta->rx_bitrate_kbps,
+					 &sinfo->rxrate);
+
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BITRATE);
+		arsta->rx_rate_code = 0;
+		arsta->rx_bitrate_kbps = 0;
+	}
 }
 
 static void ath10k_sta_statistics(struct ieee80211_hw *hw,

drivers/net/wireless/ath/ath10k/wmi-tlv.h

@@ -2174,6 +2174,15 @@ struct wmi_tlv_peer_stats_info {
 	__le32 peer_rssi_per_chain[WMI_TLV_MAX_CHAINS];
 } __packed;
 
+#define HW_RATECODE_PREAM_V1_MASK GENMASK(10, 8)
+#define WMI_TLV_GET_HW_RC_PREAM_V1(rc) FIELD_GET(HW_RATECODE_PREAM_V1_MASK, rc)
+
+#define HW_RATECODE_NSS_V1_MASK GENMASK(7, 5)
+#define WMI_TLV_GET_HW_RC_NSS_V1(rc) FIELD_GET(HW_RATECODE_NSS_V1_MASK, rc)
+
+#define HW_RATECODE_RATE_V1_MASK GENMASK(4, 0)
+#define WMI_TLV_GET_HW_RC_RATE_V1(rc) FIELD_GET(HW_RATECODE_RATE_V1_MASK, rc)
+
 struct wmi_tlv_p2p_noa_ev {
 	__le32 vdev_id;
 } __packed;