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mac80211: Support ht-cap over-rides.

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This implements ht-cap over-rides for mac80211 drivers.
HT may be disabled, making an /a/b/g/n station act like an
a/b/g station.  HT40 may be disabled forcing the station to
be HT20 even if the AP and local hardware support HT40.

MAX-AMSDU may be disabled.
AMPDU-Density may be increased.
AMPDU-Factor may be decreased.

This has been successfully tested with ath9k using patched
wpa_supplicant and iw.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ben Greear 2011-11-18 11:32:00 -08:00 • committed by John W. Linville
parent 7e7c8926b2
commit ef96a84202
9 changed files with 140 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

13
net/mac80211/util.c
View file

@ -979,7 +979,8 @@ int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
}
if (sband->ht_cap.ht_supported)
pos = ieee80211_ie_build_ht_cap(pos, sband, sband->ht_cap.cap);
pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
sband->ht_cap.cap);
/*
* If adding more here, adjust code in main.c
@ -1518,7 +1519,7 @@ void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
}
EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_supported_band *sband,
u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
u16 cap)
{
__le16 tmp;
@ -1533,13 +1534,13 @@ u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_supported_band *sband,
pos += sizeof(u16);
/* AMPDU parameters */
*pos++ = sband->ht_cap.ampdu_factor |
(sband->ht_cap.ampdu_density <<
*pos++ = ht_cap->ampdu_factor |
(ht_cap->ampdu_density <<
IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
/* MCS set */
memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
pos += sizeof(sband->ht_cap.mcs);
memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
pos += sizeof(ht_cap->mcs);
/* extended capabilities */
pos += sizeof(__le16);