netdev - [PATCH 3/3] mac80211: mesh: Add support for HW RC implementation

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Date:	Mon, 20 Jun 2016 16:00:22 +0300
From:	Maxim Altshul <maxim.altshul@...com>
To:	<johannes@...solutions.net>, <kvalo@...eaurora.org>
CC:	<eliad@...ery.com>, <yanivma@...com>, <guym@...com>,
	<arik@...ery.com>, <linux-wireless@...r.kernel.org>,
	<netdev@...r.kernel.org>, <davem@...emloft.net>,
	Maxim Altshul <maxim.altshul@...com>
Subject: [PATCH 3/3] mac80211: mesh: Add support for HW RC implementation

Mesh HWMP module will be able to rely on the HW
RC algorithm if it exists, for path metric calculations.

This allows the metric calculation mechanism to calculate
a correct metric, based on PER and last TX rate both via
HW RC algorithm if it exists or via parameters collected
by the SW.

Signed-off-by: Maxim Altshul <maxim.altshul@...com>
---
 net/mac80211/mesh_hwmp.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
index c6be0b4..e3ce40d 100644
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -12,6 +12,7 @@
 #include <asm/unaligned.h>
 #include "wme.h"
 #include "mesh.h"
+#include "driver-ops.h"
 
 #define TEST_FRAME_LEN	8192
 #define MAX_METRIC	0xffffffff
@@ -322,19 +323,25 @@ static u32 airtime_link_metric_get(struct ieee80211_local *local,
 	int device_constant = 1 << ARITH_SHIFT;
 	int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
 	int s_unit = 1 << ARITH_SHIFT;
-	int rate, err;
+	int rate, err = 0;
 	u32 tx_time, estimated_retx;
 	u64 result;
 
-	if (sta->mesh->fail_avg >= 100)
-		return MAX_METRIC;
+	/* try to get rate based on HW RC algorithm */
+	rate = drv_get_expected_throughput(local, &sta->sta);
 
-	sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
-	rate = cfg80211_calculate_bitrate(&rinfo);
-	if (WARN_ON(!rate))
-		return MAX_METRIC;
+	/* if HW does not provide us with a rate */
+	if (!rate) {
+		if (sta->mesh->fail_avg >= 100)
+			return MAX_METRIC;
 
-	err = (sta->mesh->fail_avg << ARITH_SHIFT) / 100;
+		sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
+		rate = cfg80211_calculate_bitrate(&rinfo);
+		if (WARN_ON(!rate))
+			return MAX_METRIC;
+
+		err = (sta->mesh->fail_avg << ARITH_SHIFT) / 100;
+	}
 
 	/* bitrate is in units of 100 Kbps, while we need rate in units of
 	 * 1Mbps. This will be corrected on tx_time computation.
-- 
2.7.2