From 04573657d07a0d09d170831ac3751bcbecd08387 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sun, 7 Feb 2016 14:30:01 +0000 Subject: [PATCH] mac80211: merge a fix for minstrel expected throughput reporting Signed-off-by: Felix Fietkau SVN-Revision: 48648 --- ...l-Change-expected-throughput-unit-ba.patch | 51 +++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 package/kernel/mac80211/patches/330-mac80211-minstrel-Change-expected-throughput-unit-ba.patch diff --git a/package/kernel/mac80211/patches/330-mac80211-minstrel-Change-expected-throughput-unit-ba.patch b/package/kernel/mac80211/patches/330-mac80211-minstrel-Change-expected-throughput-unit-ba.patch new file mode 100644 index 00000000000..4dc6d663ed7 --- /dev/null +++ b/package/kernel/mac80211/patches/330-mac80211-minstrel-Change-expected-throughput-unit-ba.patch @@ -0,0 +1,51 @@ +From: Sven Eckelmann +Date: Tue, 2 Feb 2016 08:12:26 +0100 +Subject: [PATCH] mac80211: minstrel: Change expected throughput unit back to + Kbps + +The change from cur_tp to the function +minstrel_get_tp_avg/minstrel_ht_get_tp_avg changed the unit used for the +current throughput. For example in minstrel_ht the correct +conversion between them would be: + + mrs->cur_tp / 10 == minstrel_ht_get_tp_avg(..). + +This factor 10 must also be included in the calculation of +minstrel_get_expected_throughput and minstrel_ht_get_expected_throughput to +return values with the unit [Kbps] instead of [10Kbps]. Otherwise routing +algorithms like B.A.T.M.A.N. V will make incorrect decision based on these +values. Its kernel based implementation expects expected_throughput always +to have the unit [Kbps] and not sometimes [10Kbps] and sometimes [Kbps]. + +The same requirement has iw or olsrdv2's nl80211 based statistics module +which retrieve the same data via NL80211_STA_INFO_TX_BITRATE. + +Cc: stable@vger.kernel.org +Fixes: 6a27b2c40b48 ("mac80211: restructure per-rate throughput calculation into function") +Signed-off-by: Sven Eckelmann +Signed-off-by: Johannes Berg +--- + +--- a/net/mac80211/rc80211_minstrel.c ++++ b/net/mac80211/rc80211_minstrel.c +@@ -711,7 +711,7 @@ static u32 minstrel_get_expected_through + * computing cur_tp + */ + tmp_mrs = &mi->r[idx].stats; +- tmp_cur_tp = minstrel_get_tp_avg(&mi->r[idx], tmp_mrs->prob_ewma); ++ tmp_cur_tp = minstrel_get_tp_avg(&mi->r[idx], tmp_mrs->prob_ewma) * 10; + tmp_cur_tp = tmp_cur_tp * 1200 * 8 / 1024; + + return tmp_cur_tp; +--- a/net/mac80211/rc80211_minstrel_ht.c ++++ b/net/mac80211/rc80211_minstrel_ht.c +@@ -1335,7 +1335,8 @@ static u32 minstrel_ht_get_expected_thro + prob = mi->groups[i].rates[j].prob_ewma; + + /* convert tp_avg from pkt per second in kbps */ +- tp_avg = minstrel_ht_get_tp_avg(mi, i, j, prob) * AVG_PKT_SIZE * 8 / 1024; ++ tp_avg = minstrel_ht_get_tp_avg(mi, i, j, prob) * 10; ++ tp_avg = tp_avg * AVG_PKT_SIZE * 8 / 1024; + + return tp_avg; + } -- 2.30.2