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authorKarl Beldan <karl.beldan@rivierawaves.com>2013-04-15 17:09:29 +0200
committerJohannes Berg <johannes.berg@intel.com>2013-04-16 16:02:18 +0200
commit6bc8312f95f982c0a6f26e87d0a6c299a697ed53 (patch)
tree09c322e4559d42d61c2feb25eb64f101f8110346 /include/net/mac80211.h
parentfffa4b1c170a3cabc58671495b0ae89ded007199 (diff)
mac80211: VHT off-by-one NSS
The number of VHT spatial streams (NSS) is found in: - s8 ieee80211_tx_rate.rate.idx[6:4] (tx - filled by rate control) - u8 ieee80211_rx_status.vht_nss (rx - filled by driver) Tx discriminates valid rates indexes with the sign bit and encodes NSS starting from 0 to 7 (note this matches some hw encodings e.g IWLMVM). Rx does not have the same constraints, and encodes NSS starting from 1 to 8 (note this matches what wireshark expects in the radiotap header). To handle ieee80211_tx_rate.rate.idx[6:4] ieee80211_rate_set_vht() and ieee80211_rate_get_vht_nss() assume their nss parameter and return value respectively runs from 0 to 7. ATM, there are only 2 users of these: cfg.c:sta_set_rate_info_t() and iwlwifi/mvm/tx.c:iwl_mvm_hwrate_to_tx_control(), but both assume nss runs from 1 to 8. This patch fixes this inconsistency by making ieee80211_rate_set_vht() and ieee80211_rate_get_vht_nss() handle an nss running from 1 to 8. Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'include/net/mac80211.h')
-rw-r--r--include/net/mac80211.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 9ff10b33b71..bc5d8184c48 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -601,8 +601,8 @@ static inline void ieee80211_rate_set_vht(struct ieee80211_tx_rate *rate,
u8 mcs, u8 nss)
{
WARN_ON(mcs & ~0xF);
- WARN_ON(nss & ~0x7);
- rate->idx = (nss << 4) | mcs;
+ WARN_ON((nss - 1) & ~0x7);
+ rate->idx = ((nss - 1) << 4) | mcs;
}
static inline u8
@@ -614,7 +614,7 @@ ieee80211_rate_get_vht_mcs(const struct ieee80211_tx_rate *rate)
static inline u8
ieee80211_rate_get_vht_nss(const struct ieee80211_tx_rate *rate)
{
- return rate->idx >> 4;
+ return (rate->idx >> 4) + 1;
}
/**