mac80211: Support ht-cap over-rides.
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>
diff --git a/net/mac80211/work.c b/net/mac80211/work.c
index 3dd5a89..6884a2d 100644
--- a/net/mac80211/work.c
+++ b/net/mac80211/work.c
@@ -94,7 +94,8 @@
/* frame sending functions */
-static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
+static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb, const u8 *ht_info_ie,
struct ieee80211_supported_band *sband,
struct ieee80211_channel *channel,
enum ieee80211_smps_mode smps)
@@ -102,7 +103,10 @@
struct ieee80211_ht_info *ht_info;
u8 *pos;
u32 flags = channel->flags;
- u16 cap = sband->ht_cap.cap;
+ u16 cap;
+ struct ieee80211_sta_ht_cap ht_cap;
+
+ BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));
if (!sband->ht_cap.ht_supported)
return;
@@ -113,9 +117,13 @@
if (ht_info_ie[1] < sizeof(struct ieee80211_ht_info))
return;
+ memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
+ ieee80211_apply_htcap_overrides(sdata, &ht_cap);
+
ht_info = (struct ieee80211_ht_info *)(ht_info_ie + 2);
/* determine capability flags */
+ cap = ht_cap.cap;
switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
@@ -154,7 +162,7 @@
/* reserve and fill IE */
pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
- ieee80211_ie_build_ht_cap(pos, sband, cap);
+ ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
}
static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
@@ -329,7 +337,7 @@
if (wk->assoc.use_11n && wk->assoc.wmm_used &&
local->hw.queues >= 4)
- ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,
+ ieee80211_add_ht_ie(sdata, skb, wk->assoc.ht_information_ie,
sband, wk->chan, wk->assoc.smps);
/* if present, add any custom non-vendor IEs that go after HT */