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authorJohannes Berg <johannes@sipsolutions.net>2009-12-17 13:55:48 +0100
committerJohn W. Linville <linville@tuxdriver.com>2009-12-21 11:32:27 -0500
commit9a418af5df03ad133cd8c8f6742b75e542db6392 (patch)
treec439a797e8fa475e348763c544f0f3be57862b56
parent8585c2b896861aacd15337c3c7e58ad114e6cf60 (diff)
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mac80211: fix peer HT capabilities
I noticed yesterday, because Jeff had noticed a speed regression, cf. bug http://bugzilla.intellinuxwireless.org/show_bug.cgi?id=2138 that the SM PS settings for peers were wrong. Instead of overwriting the SM PS settings with the local bits, we need to keep the remote bits. The bug was part of the original HT code from over two years ago, but unfortunately nobody noticed that it makes no sense -- we shouldn't be overwriting the peer's setting with our own but rather keep it intact when masking the peer capabilities with our own. While fixing that, I noticed that the masking of capabilities is completely useless for most of the bits, so also fix those other bits. Finally, I also noticed that PSMP_SUPPORT no longer exists in the final 802.11n version, so also remove that. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--drivers/net/wireless/rt2x00/rt2800lib.c3
-rw-r--r--include/linux/ieee80211.h2
-rw-r--r--net/mac80211/ht.c25
3 files changed, 24 insertions, 6 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index 6bf6c0f12f3..27bf887f145 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -2080,8 +2080,7 @@ int rt2800_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
IEEE80211_HT_CAP_SGI_20 |
IEEE80211_HT_CAP_SGI_40 |
IEEE80211_HT_CAP_TX_STBC |
- IEEE80211_HT_CAP_RX_STBC |
- IEEE80211_HT_CAP_PSMP_SUPPORT;
+ IEEE80211_HT_CAP_RX_STBC;
spec->ht.ampdu_factor = 3;
spec->ht.ampdu_density = 4;
spec->ht.mcs.tx_params =
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index d9724a28c0c..163c840437d 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -832,7 +832,7 @@ struct ieee80211_ht_cap {
#define IEEE80211_HT_CAP_DELAY_BA 0x0400
#define IEEE80211_HT_CAP_MAX_AMSDU 0x0800
#define IEEE80211_HT_CAP_DSSSCCK40 0x1000
-#define IEEE80211_HT_CAP_PSMP_SUPPORT 0x2000
+#define IEEE80211_HT_CAP_RESERVED 0x2000
#define IEEE80211_HT_CAP_40MHZ_INTOLERANT 0x4000
#define IEEE80211_HT_CAP_LSIG_TXOP_PROT 0x8000
diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index 3787455fb69..d7dcee68072 100644
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -34,9 +34,28 @@ void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
ht_cap->ht_supported = true;
- ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & sband->ht_cap.cap;
- ht_cap->cap &= ~IEEE80211_HT_CAP_SM_PS;
- ht_cap->cap |= sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS;
+ /*
+ * The bits listed in this expression should be
+ * the same for the peer and us, if the station
+ * advertises more then we can't use those thus
+ * we mask them out.
+ */
+ ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
+ (sband->ht_cap.cap |
+ ~(IEEE80211_HT_CAP_LDPC_CODING |
+ IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
+ IEEE80211_HT_CAP_GRN_FLD |
+ IEEE80211_HT_CAP_SGI_20 |
+ IEEE80211_HT_CAP_SGI_40 |
+ IEEE80211_HT_CAP_DSSSCCK40));
+ /*
+ * The STBC bits are asymmetric -- if we don't have
+ * TX then mask out the peer's RX and vice versa.
+ */
+ if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
+ ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
+ if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
+ ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;
ampdu_info = ht_cap_ie->ampdu_params_info;
ht_cap->ampdu_factor =