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Subject[PATCH v4] wcn36xx: Implement tx_rate reporting
Date
Currently, the driver reports a tx_rate of 6.0 MBit/s no matter the true
rate:

root@linaro-developer:~# iw wlan0 link
Connected to 6c:f3:7f:eb:9b:92 (on wlan0)
SSID: SQ-DEVICETEST
freq: 5200
RX: 4141 bytes (32 packets)
TX: 2082 bytes (15 packets)
signal: -77 dBm
rx bitrate: 135.0 MBit/s MCS 6 40MHz short GI
tx bitrate: 6.0 MBit/s

bss flags: short-slot-time
dtim period: 1
beacon int: 100

This patch requests HAL_GLOBAL_CLASS_A_STATS_INFO via a hal_get_stats
firmware message and reports it via ieee80211_ops::sta_statistics.

root@linaro-developer:~# iw wlan0 link
Connected to 6c:f3:7f:eb:73:b2 (on wlan0)
SSID: SQ-DEVICETEST
freq: 5700
RX: 26788094 bytes (19859 packets)
TX: 1101376 bytes (12119 packets)
signal: -75 dBm
rx bitrate: 135.0 MBit/s MCS 6 40MHz short GI
tx bitrate: 108.0 MBit/s VHT-MCS 5 40MHz VHT-NSS 1

bss flags: short-slot-time
dtim period: 1
beacon int: 100

Tested on MSM8939 with WCN3680B running firmware CNSS-PR-2-0-1-2-c1-00083,
and verified by sniffing frames over the air with Wireshark to ensure the
MCS indices match.

Signed-off-by: Edmond Gagnon <egagnon@squareup.com>
Reviewed-by: Benjamin Li <benl@squareup.com>
---

Changes in v4:
- Shortened very long line in smd.c
- Fixed every checkpatch issue I could find:
scripts/checkpatch.pl --strict
0001-wcn36xx-Implement-tx_rate-reporting.patch
total: 0 errors, 0 warnings, 0 checks, 156 lines checked
Changes in v3:
- Refactored to report tx_rate via ieee80211_ops::sta_statistics
- Dropped get_sta_index patch
- Addressed style comments
Changes in v2:
- Refactored to use existing wcn36xx_hal_get_stats_{req,rsp}_msg structs.
- Added more notes about testing.
- Reduced reporting interval to 3000msec.
- Assorted type and memory safety fixes.
- Make wcn36xx_smd_get_stats friendlier to future message implementors.

drivers/net/wireless/ath/wcn36xx/hal.h | 7 ++-
drivers/net/wireless/ath/wcn36xx/main.c | 16 +++++++
drivers/net/wireless/ath/wcn36xx/smd.c | 57 +++++++++++++++++++++++++
drivers/net/wireless/ath/wcn36xx/smd.h | 2 +
drivers/net/wireless/ath/wcn36xx/txrx.c | 29 +++++++++++++
drivers/net/wireless/ath/wcn36xx/txrx.h | 1 +
6 files changed, 111 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/wcn36xx/hal.h b/drivers/net/wireless/ath/wcn36xx/hal.h
index 2a1db9756fd5..46a49f0a51b3 100644
--- a/drivers/net/wireless/ath/wcn36xx/hal.h
+++ b/drivers/net/wireless/ath/wcn36xx/hal.h
@@ -2626,7 +2626,12 @@ enum tx_rate_info {
HAL_TX_RATE_SGI = 0x8,

/* Rate with Long guard interval */
- HAL_TX_RATE_LGI = 0x10
+ HAL_TX_RATE_LGI = 0x10,
+
+ /* VHT rates */
+ HAL_TX_RATE_VHT20 = 0x20,
+ HAL_TX_RATE_VHT40 = 0x40,
+ HAL_TX_RATE_VHT80 = 0x80,
};

struct ani_global_class_a_stats_info {
diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c
index b545d4b2b8c4..fc76b090c39f 100644
--- a/drivers/net/wireless/ath/wcn36xx/main.c
+++ b/drivers/net/wireless/ath/wcn36xx/main.c
@@ -1400,6 +1400,21 @@ static int wcn36xx_get_survey(struct ieee80211_hw *hw, int idx,
return 0;
}

+static void wcn36xx_sta_statistics(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+ struct ieee80211_sta *sta, struct station_info *sinfo)
+{
+ struct wcn36xx *wcn;
+ u8 sta_index;
+ int status = 0;
+
+ wcn = hw->priv;
+ sta_index = get_sta_index(vif, wcn36xx_sta_to_priv(sta));
+ status = wcn36xx_smd_get_stats(wcn, sta_index, HAL_GLOBAL_CLASS_A_STATS_INFO, sinfo);
+
+ if (status)
+ wcn36xx_err("wcn36xx_smd_get_stats failed\n");
+}
+
static const struct ieee80211_ops wcn36xx_ops = {
.start = wcn36xx_start,
.stop = wcn36xx_stop,
@@ -1423,6 +1438,7 @@ static const struct ieee80211_ops wcn36xx_ops = {
.set_rts_threshold = wcn36xx_set_rts_threshold,
.sta_add = wcn36xx_sta_add,
.sta_remove = wcn36xx_sta_remove,
+ .sta_statistics = wcn36xx_sta_statistics,
.ampdu_action = wcn36xx_ampdu_action,
#if IS_ENABLED(CONFIG_IPV6)
.ipv6_addr_change = wcn36xx_ipv6_addr_change,
diff --git a/drivers/net/wireless/ath/wcn36xx/smd.c b/drivers/net/wireless/ath/wcn36xx/smd.c
index caeb68901326..a2188b41e308 100644
--- a/drivers/net/wireless/ath/wcn36xx/smd.c
+++ b/drivers/net/wireless/ath/wcn36xx/smd.c
@@ -2627,6 +2627,62 @@ int wcn36xx_smd_del_ba(struct wcn36xx *wcn, u16 tid, u8 direction, u8 sta_index)
return ret;
}

+int wcn36xx_smd_get_stats(struct wcn36xx *wcn, u8 sta_index, u32 stats_mask,
+ struct station_info *sinfo)
+{
+ struct wcn36xx_hal_stats_req_msg msg_body;
+ struct wcn36xx_hal_stats_rsp_msg *rsp;
+ void *rsp_body;
+ int ret = 0;
+
+ if (stats_mask & ~HAL_GLOBAL_CLASS_A_STATS_INFO) {
+ wcn36xx_err("stats_mask 0x%x contains unimplemented types\n",
+ stats_mask);
+ return -EINVAL;
+ }
+
+ mutex_lock(&wcn->hal_mutex);
+ INIT_HAL_MSG(msg_body, WCN36XX_HAL_GET_STATS_REQ);
+
+ msg_body.sta_id = sta_index;
+ msg_body.stats_mask = stats_mask;
+
+ PREPARE_HAL_BUF(wcn->hal_buf, msg_body);
+
+ ret = wcn36xx_smd_send_and_wait(wcn, msg_body.header.len);
+ if (ret) {
+ wcn36xx_err("sending hal_get_stats failed\n");
+ goto out;
+ }
+
+ ret = wcn36xx_smd_rsp_status_check(wcn->hal_buf, wcn->hal_rsp_len);
+ if (ret) {
+ wcn36xx_err("hal_get_stats response failed err=%d\n", ret);
+ goto out;
+ }
+
+ rsp = (struct wcn36xx_hal_stats_rsp_msg *)wcn->hal_buf;
+ rsp_body = (wcn->hal_buf + sizeof(struct wcn36xx_hal_stats_rsp_msg));
+
+ if (rsp->stats_mask != stats_mask) {
+ wcn36xx_err("stats_mask 0x%x differs from requested 0x%x\n",
+ rsp->stats_mask, stats_mask);
+ goto out;
+ }
+
+ if (rsp->stats_mask & HAL_GLOBAL_CLASS_A_STATS_INFO) {
+ struct ani_global_class_a_stats_info *stats_info = rsp_body;
+
+ wcn36xx_process_tx_rate(stats_info, &sinfo->txrate);
+ sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BITRATE);
+ rsp_body += sizeof(struct ani_global_class_a_stats_info);
+ }
+out:
+ mutex_unlock(&wcn->hal_mutex);
+
+ return ret;
+}
+
static int wcn36xx_smd_trigger_ba_rsp(void *buf, int len, struct add_ba_info *ba_info)
{
struct wcn36xx_hal_trigger_ba_rsp_candidate *candidate;
@@ -3316,6 +3372,7 @@ int wcn36xx_smd_rsp_process(struct rpmsg_device *rpdev,
case WCN36XX_HAL_ADD_BA_SESSION_RSP:
case WCN36XX_HAL_ADD_BA_RSP:
case WCN36XX_HAL_DEL_BA_RSP:
+ case WCN36XX_HAL_GET_STATS_RSP:
case WCN36XX_HAL_TRIGGER_BA_RSP:
case WCN36XX_HAL_UPDATE_CFG_RSP:
case WCN36XX_HAL_JOIN_RSP:
diff --git a/drivers/net/wireless/ath/wcn36xx/smd.h b/drivers/net/wireless/ath/wcn36xx/smd.h
index 957cfa87fbde..3fd598ac2a27 100644
--- a/drivers/net/wireless/ath/wcn36xx/smd.h
+++ b/drivers/net/wireless/ath/wcn36xx/smd.h
@@ -138,6 +138,8 @@ int wcn36xx_smd_add_ba_session(struct wcn36xx *wcn,
int wcn36xx_smd_add_ba(struct wcn36xx *wcn, u8 session_id);
int wcn36xx_smd_del_ba(struct wcn36xx *wcn, u16 tid, u8 direction, u8 sta_index);
int wcn36xx_smd_trigger_ba(struct wcn36xx *wcn, u8 sta_index, u16 tid, u16 *ssn);
+int wcn36xx_smd_get_stats(struct wcn36xx *wcn, u8 sta_index, u32 stats_mask,
+ struct station_info *sinfo);

int wcn36xx_smd_update_cfg(struct wcn36xx *wcn, u32 cfg_id, u32 value);

diff --git a/drivers/net/wireless/ath/wcn36xx/txrx.c b/drivers/net/wireless/ath/wcn36xx/txrx.c
index df749b114568..8da3955995b6 100644
--- a/drivers/net/wireless/ath/wcn36xx/txrx.c
+++ b/drivers/net/wireless/ath/wcn36xx/txrx.c
@@ -699,3 +699,32 @@ int wcn36xx_start_tx(struct wcn36xx *wcn,

return ret;
}
+
+void wcn36xx_process_tx_rate(struct ani_global_class_a_stats_info *stats, struct rate_info *info)
+{
+ /* tx_rate is in units of 500kbps; mac80211 wants them in 100kbps */
+ if (stats->tx_rate_flags & HAL_TX_RATE_LEGACY)
+ info->legacy = stats->tx_rate * 5;
+
+ info->flags = 0;
+ info->mcs = stats->mcs_index;
+ info->nss = 1;
+
+ if (stats->tx_rate_flags & (HAL_TX_RATE_HT20 | HAL_TX_RATE_HT40))
+ info->flags |= RATE_INFO_FLAGS_MCS;
+
+ if (stats->tx_rate_flags & (HAL_TX_RATE_VHT20 | HAL_TX_RATE_VHT40 | HAL_TX_RATE_VHT80))
+ info->flags |= RATE_INFO_FLAGS_VHT_MCS;
+
+ if (stats->tx_rate_flags & HAL_TX_RATE_SGI)
+ info->flags |= RATE_INFO_FLAGS_SHORT_GI;
+
+ if (stats->tx_rate_flags & (HAL_TX_RATE_HT20 | HAL_TX_RATE_VHT20))
+ info->bw = RATE_INFO_BW_20;
+
+ if (stats->tx_rate_flags & (HAL_TX_RATE_HT40 | HAL_TX_RATE_VHT40))
+ info->bw = RATE_INFO_BW_40;
+
+ if (stats->tx_rate_flags & HAL_TX_RATE_VHT80)
+ info->bw = RATE_INFO_BW_80;
+}
diff --git a/drivers/net/wireless/ath/wcn36xx/txrx.h b/drivers/net/wireless/ath/wcn36xx/txrx.h
index b54311ffde9c..fb0d6cabd52b 100644
--- a/drivers/net/wireless/ath/wcn36xx/txrx.h
+++ b/drivers/net/wireless/ath/wcn36xx/txrx.h
@@ -164,5 +164,6 @@ int wcn36xx_rx_skb(struct wcn36xx *wcn, struct sk_buff *skb);
int wcn36xx_start_tx(struct wcn36xx *wcn,
struct wcn36xx_sta *sta_priv,
struct sk_buff *skb);
+void wcn36xx_process_tx_rate(struct ani_global_class_a_stats_info *stats, struct rate_info *info);

#endif /* _TXRX_H_ */
--
2.25.1
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