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mac80211: mesh: use average bitrate for link metric calculation

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Use bitrate moving average to smooth out link metric and stablize path
selection.

Signed-off-by: Julan Hsu <julanhsu@google.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Julan Hsu
2019-01-15 15:31:56 -08:00
committed by Johannes Berg
parent 540bbcb930
commit 67fc05549c
3 changed files with 15 additions and 3 deletions
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9
net/mac80211/mesh_hwmp.c
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@@ -300,6 +300,7 @@ void ieee80211s_update_metric(struct ieee80211_local *local,
{
struct ieee80211_tx_info *txinfo = st->info;
int failed;
struct rate_info rinfo;
failed = !(txinfo->flags & IEEE80211_TX_STAT_ACK);
@@ -310,12 +311,15 @@ void ieee80211s_update_metric(struct ieee80211_local *local,
if (ewma_mesh_fail_avg_read(&sta->mesh->fail_avg) >
LINK_FAIL_THRESH)
mesh_plink_broken(sta);
sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
ewma_mesh_tx_rate_avg_add(&sta->mesh->tx_rate_avg,
cfg80211_calculate_bitrate(&rinfo));
}
static u32 airtime_link_metric_get(struct ieee80211_local *local,
struct sta_info *sta)
{
struct rate_info rinfo;
/* This should be adjusted for each device */
int device_constant = 1 << ARITH_SHIFT;
int test_frame_len = TEST_FRAME_LEN << ARITH_SHIFT;
@@ -339,8 +343,7 @@ static u32 airtime_link_metric_get(struct ieee80211_local *local,
if (fail_avg > LINK_FAIL_THRESH)
return MAX_METRIC;
sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate, &rinfo);
rate = cfg80211_calculate_bitrate(&rinfo);
rate = ewma_mesh_tx_rate_avg_read(&sta->mesh->tx_rate_avg);
if (WARN_ON(!rate))
return MAX_METRIC;