From 3b17fbf87d5dadf123d328ab072334da285748c1 Mon Sep 17 00:00:00 2001 From: Maxim Altshul Date: Mon, 11 Jul 2016 17:15:24 +0300 Subject: 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 Signed-off-by: Johannes Berg --- net/mac80211/mesh_hwmp.c | 27 +++++++++++++++++++-------- 1 file changed, 19 insertions(+), 8 deletions(-) (limited to 'net/mac80211/mesh_hwmp.c') diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c index 8f9c3bde835f..fa7d37cf0351 100644 --- a/net/mac80211/mesh_hwmp.c +++ b/net/mac80211/mesh_hwmp.c @@ -326,22 +326,33 @@ static u32 airtime_link_metric_get(struct ieee80211_local *local, u32 tx_time, estimated_retx; u64 result; - if (sta->mesh->fail_avg >= 100) - return MAX_METRIC; + /* Try to get rate based on HW/SW RC algorithm. + * Rate is returned in units of Kbps, correct this + * to comply with airtime calculation units + * Round up in case we get rate < 100Kbps + */ + rate = DIV_ROUND_UP(sta_get_expected_throughput(sta), 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; + if (rate) { + err = 0; + } else { + 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. */ tx_time = (device_constant + 10 * test_frame_len / rate); estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); - result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT) ; + result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT); return (u32)result; } -- cgit v1.2.3