[PATCH v2 1/3] mac80211: allow non-standard VHT MCS-10/11

[PATCH v2 1/3] mac80211: allow non-standard VHT MCS-10/11

[Ping-Ke Shih]

Some AP can possibly try non-standard VHT rate and mac80211 warns and drops
packets, and leads low TCP throughput.

    Rate marked as a VHT rate but data is invalid: MCS: 10, NSS: 2
    WARNING: CPU: 1 PID: 7817 at net/mac80211/rx.c:4856 ieee80211_rx_list+0x223/0x2f0 [mac8021

Since commit c27aa56a72b8 ("cfg80211: add VHT rate entries for MCS-10 and MCS-11")
has added, mac80211 adds this support as well.

After this patch, throughput is good and iw can get the bitrate:
    rx bitrate:	975.1 MBit/s VHT-MCS 10 80MHz short GI VHT-NSS 2
or
    rx bitrate:	1083.3 MBit/s VHT-MCS 11 80MHz short GI VHT-NSS 2

Buglink: https://bugzilla.suse.com/show_bug.cgi?id=1192891
Reported-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
---
v2: allow VHT MCS-10/11 in mac80211. v1 doesn't have this.
---
 net/mac80211/rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 0544563ede522..d2e8b84ed2836 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -4924,7 +4924,7 @@ void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
 				goto drop;
 			break;
 		case RX_ENC_VHT:
-			if (WARN_ONCE(status->rate_idx > 9 ||
+			if (WARN_ONCE(status->rate_idx > 11 ||
 				      !status->nss ||
 				      status->nss > 8,
 				      "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",
-- 
2.25.1

[PATCH v2 2/3] rtw89: Add RX counters of VHT MCS-10/11 to debugfs

[Ping-Ke Shih]

8852AE can receive packets with VHT MCS10/11, and we want to know we have
received this kind of packets, so show the counter of VHT MCS10/11 in
debugfs, like:

TP TX: 1 [1] Mbps (lv: 1), RX: 420 [422] Mbps (lv: 4)
Beacon: 19
Avg packet length: TX=102, RX=3081
RX count:
   Legacy: [0, 0, 0, 0]
     OFDM: [0, 0, 0, 0, 0, 0, 0, 0]
     HT 0: [0, 0, 0, 0, 0, 0, 0, 0]
     HT 1: [0, 0, 0, 0, 0, 0, 0, 0]
  VHT 1SS: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0][0, 0]
  VHT 2SS: [0, 0, 0, 0, 0, 0, 0, 4, 624, 4818][29913, 556]
   HE 1SS: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
   HE 2ss: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
TX rate [0]: VHT 2SS MCS-9 SGI	(hw_rate=0x119)	==> agg_wait=1 (3500)
RX rate [0]: VHT 2SS MCS-10 SGI	(hw_rate=0x11a)
RSSI: -30 dBm (raw=161, prev=165)

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
---
v2: remove VHT MCS-10/11 limit from driver, and change subject.
---
 drivers/net/wireless/realtek/rtw89/debug.c | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw89/debug.c b/drivers/net/wireless/realtek/rtw89/debug.c
index 9756d75ef24e1..fb2f4870172d9 100644
--- a/drivers/net/wireless/realtek/rtw89/debug.c
+++ b/drivers/net/wireless/realtek/rtw89/debug.c
@@ -2322,16 +2322,17 @@ rtw89_debug_append_rx_rate(struct seq_file *m, struct rtw89_pkt_stat *pkt_stat,
 static const struct rtw89_rx_rate_cnt_info {
 	enum rtw89_hw_rate first_rate;
 	int len;
+	int ext;
 	const char *rate_mode;
 } rtw89_rx_rate_cnt_infos[] = {
-	{RTW89_HW_RATE_CCK1, 4, "Legacy:"},
-	{RTW89_HW_RATE_OFDM6, 8, "OFDM:"},
-	{RTW89_HW_RATE_MCS0, 8, "HT 0:"},
-	{RTW89_HW_RATE_MCS8, 8, "HT 1:"},
-	{RTW89_HW_RATE_VHT_NSS1_MCS0, 10, "VHT 1SS:"},
-	{RTW89_HW_RATE_VHT_NSS2_MCS0, 10, "VHT 2SS:"},
-	{RTW89_HW_RATE_HE_NSS1_MCS0, 12, "HE 1SS:"},
-	{RTW89_HW_RATE_HE_NSS2_MCS0, 12, "HE 2ss:"},
+	{RTW89_HW_RATE_CCK1, 4, 0, "Legacy:"},
+	{RTW89_HW_RATE_OFDM6, 8, 0, "OFDM:"},
+	{RTW89_HW_RATE_MCS0, 8, 0, "HT 0:"},
+	{RTW89_HW_RATE_MCS8, 8, 0, "HT 1:"},
+	{RTW89_HW_RATE_VHT_NSS1_MCS0, 10, 2, "VHT 1SS:"},
+	{RTW89_HW_RATE_VHT_NSS2_MCS0, 10, 2, "VHT 2SS:"},
+	{RTW89_HW_RATE_HE_NSS1_MCS0, 12, 0, "HE 1SS:"},
+	{RTW89_HW_RATE_HE_NSS2_MCS0, 12, 0, "HE 2ss:"},
 };
 
 static int rtw89_debug_priv_phy_info_get(struct seq_file *m, void *v)
@@ -2356,6 +2357,11 @@ static int rtw89_debug_priv_phy_info_get(struct seq_file *m, void *v)
 		seq_printf(m, "%10s [", info->rate_mode);
 		rtw89_debug_append_rx_rate(m, pkt_stat,
 					   info->first_rate, info->len);
+		if (info->ext) {
+			seq_puts(m, "][");
+			rtw89_debug_append_rx_rate(m, pkt_stat,
+						   info->first_rate + info->len, info->ext);
+		}
 		seq_puts(m, "]\n");
 	}
 
-- 
2.25.1

[PATCH v2 3/3] rtw89: encapsulate RX handlers to single function

[Ping-Ke Shih]

We have three points to receive packets to mac80211 with three different
kinds of status. Many handlers are common and can be shared, so I move
them together, and I don't change the logic at all.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
---
 drivers/net/wireless/realtek/rtw89/core.c | 32 ++++++++++++-----------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw89/core.c b/drivers/net/wireless/realtek/rtw89/core.c
index 00ae86807dc21..126b35b44cd11 100644
--- a/drivers/net/wireless/realtek/rtw89/core.c
+++ b/drivers/net/wireless/realtek/rtw89/core.c
@@ -1085,6 +1085,18 @@ static void rtw89_core_hw_to_sband_rate(struct ieee80211_rx_status *rx_status)
 	rx_status->rate_idx -= 4;
 }
 
+static void rtw89_core_rx_to_mac80211(struct rtw89_dev *rtwdev,
+				      struct rtw89_rx_phy_ppdu *phy_ppdu,
+				      struct rtw89_rx_desc_info *desc_info,
+				      struct sk_buff *skb_ppdu,
+				      struct ieee80211_rx_status *rx_status)
+{
+	rtw89_core_hw_to_sband_rate(rx_status);
+	rtw89_core_rx_stats(rtwdev, phy_ppdu, desc_info, skb_ppdu);
+	ieee80211_rx_napi(rtwdev->hw, NULL, skb_ppdu, &rtwdev->napi);
+	rtwdev->napi_budget_countdown--;
+}
+
 static void rtw89_core_rx_pending_skb(struct rtw89_dev *rtwdev,
 				      struct rtw89_rx_phy_ppdu *phy_ppdu,
 				      struct rtw89_rx_desc_info *desc_info,
@@ -1104,10 +1116,7 @@ static void rtw89_core_rx_pending_skb(struct rtw89_dev *rtwdev,
 		if (rtw89_core_rx_ppdu_match(rtwdev, desc_info, rx_status))
 			rtw89_chip_query_ppdu(rtwdev, phy_ppdu, rx_status);
 		rtw89_correct_cck_chan(rtwdev, rx_status);
-		rtw89_core_hw_to_sband_rate(rx_status);
-		rtw89_core_rx_stats(rtwdev, phy_ppdu, desc_info, skb_ppdu);
-		ieee80211_rx_napi(rtwdev->hw, NULL, skb_ppdu, &rtwdev->napi);
-		rtwdev->napi_budget_countdown--;
+		rtw89_core_rx_to_mac80211(rtwdev, phy_ppdu, desc_info, skb_ppdu, rx_status);
 	}
 }
 
@@ -1332,10 +1341,7 @@ static void rtw89_core_flush_ppdu_rx_queue(struct rtw89_dev *rtwdev,
 	skb_queue_walk_safe(&ppdu_sts->rx_queue[band], skb_ppdu, tmp) {
 		skb_unlink(skb_ppdu, &ppdu_sts->rx_queue[band]);
 		rx_status = IEEE80211_SKB_RXCB(skb_ppdu);
-		rtw89_core_hw_to_sband_rate(rx_status);
-		rtw89_core_rx_stats(rtwdev, NULL, desc_info, skb_ppdu);
-		ieee80211_rx_napi(rtwdev->hw, NULL, skb_ppdu, &rtwdev->napi);
-		rtwdev->napi_budget_countdown--;
+		rtw89_core_rx_to_mac80211(rtwdev, NULL, desc_info, skb_ppdu, rx_status);
 	}
 }
 
@@ -1362,14 +1368,10 @@ void rtw89_core_rx(struct rtw89_dev *rtwdev,
 	memset(rx_status, 0, sizeof(*rx_status));
 	rtw89_core_update_rx_status(rtwdev, desc_info, rx_status);
 	if (desc_info->long_rxdesc &&
-	    BIT(desc_info->frame_type) & PPDU_FILTER_BITMAP) {
+	    BIT(desc_info->frame_type) & PPDU_FILTER_BITMAP)
 		skb_queue_tail(&ppdu_sts->rx_queue[band], skb);
-	} else {
-		rtw89_core_hw_to_sband_rate(rx_status);
-		rtw89_core_rx_stats(rtwdev, NULL, desc_info, skb);
-		ieee80211_rx_napi(rtwdev->hw, NULL, skb, &rtwdev->napi);
-		rtwdev->napi_budget_countdown--;
-	}
+	else
+		rtw89_core_rx_to_mac80211(rtwdev, NULL, desc_info, skb, rx_status);
 }
 EXPORT_SYMBOL(rtw89_core_rx);
 
-- 
2.25.1

Re: [PATCH v2 2/3] rtw89: Add RX counters of VHT MCS-10/11 to debugfs

[Kalle Valo]

Ping-Ke Shih <pkshih@realtek.com> wrote:

> 8852AE can receive packets with VHT MCS10/11, and we want to know we have
> received this kind of packets, so show the counter of VHT MCS10/11 in
> debugfs, like:
> 
> TP TX: 1 [1] Mbps (lv: 1), RX: 420 [422] Mbps (lv: 4)
> Beacon: 19
> Avg packet length: TX=102, RX=3081
> RX count:
>    Legacy: [0, 0, 0, 0]
>      OFDM: [0, 0, 0, 0, 0, 0, 0, 0]
>      HT 0: [0, 0, 0, 0, 0, 0, 0, 0]
>      HT 1: [0, 0, 0, 0, 0, 0, 0, 0]
>   VHT 1SS: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0][0, 0]
>   VHT 2SS: [0, 0, 0, 0, 0, 0, 0, 4, 624, 4818][29913, 556]
>    HE 1SS: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
>    HE 2ss: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
> TX rate [0]: VHT 2SS MCS-9 SGI	(hw_rate=0x119)	==> agg_wait=1 (3500)
> RX rate [0]: VHT 2SS MCS-10 SGI	(hw_rate=0x11a)
> RSSI: -30 dBm (raw=161, prev=165)
> 
> Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>

2 patches applied to wireless-next.git, thanks.

e56f3420106e rtw89: Add RX counters of VHT MCS-10/11 to debugfs
c1ea345deda8 rtw89: encapsulate RX handlers to single function

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20220103013623.17052-2-pkshih@realtek.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches