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mac80211: mesh: Add support for HW RC implementation

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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@ti.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Maxim Altshul
2016-07-11 17:15:24 +03:00
committed by Johannes Berg
parent 6cdaf03f8c
commit 3b17fbf87d
3 changed files with 40 additions and 12 deletions
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27
net/mac80211/mesh_hwmp.c
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@@ -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;
}