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authorThomas Pedersen <thomas@cozybit.com>2012-03-05 15:31:48 -0800
committerJohn W. Linville <linville@tuxdriver.com>2012-03-06 15:16:17 -0500
commit6b62bf326393deede630731a933713de9d574128 (patch)
tree73d17abe9a0c55938dae6378bab61dc82343881a /net/mac80211/mesh_hwmp.c
parent8097e1494459a4f9cdbaba7440334d9bd11a39f0 (diff)
downloadlinux-sh-6b62bf326393deede630731a933713de9d574128.tar.gz
mac80211: fix mesh airtime link metric estimating
Airtime link metric estimation was broken in HT mesh, use cfg80211_calculate_bitrate to get the right rate value. Also factor out tx rate copying from sta_set_sinfo(). Signed-off-by: Thomas Pedersen <thomas@cozybit.com> Reviewed-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/mesh_hwmp.c')
-rw-r--r--net/mac80211/mesh_hwmp.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c
index 4a993f2d1ae1..1c6f3d02aebf 100644
--- a/net/mac80211/mesh_hwmp.c
+++ b/net/mac80211/mesh_hwmp.c
@@ -324,6 +324,7 @@ static u32 airtime_link_metric_get(struct ieee80211_local *local,
struct sta_info *sta)
{
struct ieee80211_supported_band *sband;
+ 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;
@@ -337,7 +338,9 @@ static u32 airtime_link_metric_get(struct ieee80211_local *local,
if (sta->fail_avg >= 100)
return MAX_METRIC;
- if (sta->last_tx_rate.flags & IEEE80211_TX_RC_MCS)
+ sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo);
+ rate = cfg80211_calculate_bitrate(&rinfo);
+ if (WARN_ON(!rate))
return MAX_METRIC;
err = (sta->fail_avg << ARITH_SHIFT) / 100;
@@ -345,7 +348,6 @@ static u32 airtime_link_metric_get(struct ieee80211_local *local,
/* bitrate is in units of 100 Kbps, while we need rate in units of
* 1Mbps. This will be corrected on tx_time computation.
*/
- rate = sband->bitrates[sta->last_tx_rate.idx].bitrate;
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) ;