diff options
author | Johannes Berg <johannes.berg@intel.com> | 2016-03-31 20:02:08 +0300 |
---|---|---|
committer | Johannes Berg <johannes.berg@intel.com> | 2016-04-06 13:18:17 +0200 |
commit | 4f6b1b3daaf167bf927174224e07efd17ed95984 (patch) | |
tree | 5591e35073577767d0ffb3eadaf74a3a2e0ce9ae /net/mac80211/sta_info.c | |
parent | b8da6b6a99b4b0d8d464b621ba7dcbcb08172b7d (diff) |
mac80211: fix last RX rate data consistency
When storing the last_rate_* values in the RX code, there's nothing
to guarantee consistency, so a concurrent reader could see, e.g.
last_rate_idx on the new value, but last_rate_flag still on the old,
getting completely bogus values in the end.
To fix this, I lifted the sta_stats_encode_rate() function from my
old rate statistics code, which encodes the entire rate data into a
single 16-bit value, avoiding the consistency issue.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/sta_info.c')
-rw-r--r-- | net/mac80211/sta_info.c | 60 |
1 files changed, 32 insertions, 28 deletions
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index ac73b9c7e8d8..0b50ae3f0b05 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -1928,43 +1928,47 @@ u8 sta_info_tx_streams(struct sta_info *sta) >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; } -static void sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo) +static void sta_stats_decode_rate(struct ieee80211_local *local, u16 rate, + struct rate_info *rinfo) { - rinfo->flags = 0; - - if (sta->rx_stats.last_rate_flag & RX_FLAG_HT) { - rinfo->flags |= RATE_INFO_FLAGS_MCS; - rinfo->mcs = sta->rx_stats.last_rate_idx; - } else if (sta->rx_stats.last_rate_flag & RX_FLAG_VHT) { - rinfo->flags |= RATE_INFO_FLAGS_VHT_MCS; - rinfo->nss = sta->rx_stats.last_rate_vht_nss; - rinfo->mcs = sta->rx_stats.last_rate_idx; - } else { + rinfo->bw = (rate & STA_STATS_RATE_BW_MASK) >> + STA_STATS_RATE_BW_SHIFT; + + if (rate & STA_STATS_RATE_VHT) { + rinfo->flags = RATE_INFO_FLAGS_VHT_MCS; + rinfo->mcs = rate & 0xf; + rinfo->nss = (rate & 0xf0) >> 4; + } else if (rate & STA_STATS_RATE_HT) { + rinfo->flags = RATE_INFO_FLAGS_MCS; + rinfo->mcs = rate & 0xff; + } else if (rate & STA_STATS_RATE_LEGACY) { struct ieee80211_supported_band *sband; - int shift = ieee80211_vif_get_shift(&sta->sdata->vif); u16 brate; - - sband = sta->local->hw.wiphy->bands[ - ieee80211_get_sdata_band(sta->sdata)]; - brate = sband->bitrates[sta->rx_stats.last_rate_idx].bitrate; + unsigned int shift; + + sband = local->hw.wiphy->bands[(rate >> 4) & 0xf]; + brate = sband->bitrates[rate & 0xf].bitrate; + if (rinfo->bw == RATE_INFO_BW_5) + shift = 2; + else if (rinfo->bw == RATE_INFO_BW_10) + shift = 1; + else + shift = 0; rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift); } - if (sta->rx_stats.last_rate_flag & RX_FLAG_SHORT_GI) + if (rate & STA_STATS_RATE_SGI) rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI; +} + +static void sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo) +{ + u16 rate = ACCESS_ONCE(sta->rx_stats.last_rate); - if (sta->rx_stats.last_rate_flag & RX_FLAG_5MHZ) - rinfo->bw = RATE_INFO_BW_5; - else if (sta->rx_stats.last_rate_flag & RX_FLAG_10MHZ) - rinfo->bw = RATE_INFO_BW_10; - else if (sta->rx_stats.last_rate_flag & RX_FLAG_40MHZ) - rinfo->bw = RATE_INFO_BW_40; - else if (sta->rx_stats.last_rate_vht_flag & RX_VHT_FLAG_80MHZ) - rinfo->bw = RATE_INFO_BW_80; - else if (sta->rx_stats.last_rate_vht_flag & RX_VHT_FLAG_160MHZ) - rinfo->bw = RATE_INFO_BW_160; + if (rate == STA_STATS_RATE_INVALID) + rinfo->flags = 0; else - rinfo->bw = RATE_INFO_BW_20; + sta_stats_decode_rate(sta->local, rate, rinfo); } void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo) |